diff --git a/include/mbedtls/ssl_internal.h b/include/mbedtls/ssl_internal.h index 1a7067777..1b359e670 100644 --- a/include/mbedtls/ssl_internal.h +++ b/include/mbedtls/ssl_internal.h @@ -1102,4 +1102,8 @@ void mbedtls_ssl_buffering_free( mbedtls_ssl_context *ssl ); void mbedtls_ssl_flight_free( mbedtls_ssl_flight_item *flight ); #endif /* MBEDTLS_SSL_PROTO_DTLS */ +#if defined(MBEDTLS_X509_CRT_PARSE_C) +void mbedtls_ssl_clear_peer_cert( mbedtls_ssl_session *session ); +#endif /* MBEDTLS_X509_CRT_PARSE_C */ + #endif /* ssl_internal.h */ diff --git a/library/ssl_12_cli.c b/library/ssl_12_cli.c index 0f6a26b18..627ba1be6 100644 --- a/library/ssl_12_cli.c +++ b/library/ssl_12_cli.c @@ -1,5 +1,6 @@ /* - * SSLv3/TLSv1 client-side functions + * Client-specific handshake reading/writing functions + * for TLS versions <= 1.2. * * Copyright (C) 2006-2015, ARM Limited, All Rights Reserved * SPDX-License-Identifier: Apache-2.0 @@ -56,43 +57,163 @@ #include "mbedtls/platform_util.h" #endif -#if defined(MBEDTLS_KEY_EXCHANGE__SOME__PSK_ENABLED) -static int ssl_conf_has_static_psk( mbedtls_ssl_config const *conf ) +/* Forward declarations for state-specific handshake functions. */ +static int ssl_write_client_hello( mbedtls_ssl_context *ssl ); +#if defined(MBEDTLS_SSL_PROTO_DTLS) +static int ssl_parse_hello_verify_request( mbedtls_ssl_context *ssl ); +#endif /* MBEDTLS_SSL_PROTO_DTLS */ +static int ssl_parse_server_hello( mbedtls_ssl_context *ssl ); +static int ssl_parse_server_key_exchange( mbedtls_ssl_context *ssl ); +static int ssl_parse_certificate_request( mbedtls_ssl_context *ssl ); +static int ssl_parse_server_hello_done( mbedtls_ssl_context *ssl ); +static int ssl_write_client_key_exchange( mbedtls_ssl_context *ssl ); +static int ssl_write_certificate_verify( mbedtls_ssl_context *ssl ); +#if defined(MBEDTLS_SSL_SESSION_TICKETS) +static int ssl_parse_new_session_ticket( mbedtls_ssl_context *ssl ); +#endif /* MBEDTLS_SSL_SESSION_TICKETS */ + +/* + * Client-side handshake state machine + * + * This function performs a single step in a client-side TLS <= 1.2 handshake. + */ +int mbedtls_ssl_handshake_client_step( mbedtls_ssl_context *ssl ) { - if( conf->psk_identity == NULL || - conf->psk_identity_len == 0 ) + int ret = 0; + + if( ssl->state == MBEDTLS_SSL_HANDSHAKE_OVER || ssl->handshake == NULL ) + return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); + + MBEDTLS_SSL_DEBUG_MSG( 2, ( "client state: %d", ssl->state ) ); + + if( ( ret = mbedtls_ssl_flush_output( ssl ) ) != 0 ) + return( ret ); + +#if defined(MBEDTLS_SSL_PROTO_DTLS) + if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM && + ssl->handshake->retransmit_state == MBEDTLS_SSL_RETRANS_SENDING ) { - return( 0 ); + if( ( ret = mbedtls_ssl_flight_transmit( ssl ) ) != 0 ) + return( ret ); } +#endif /* MBEDTLS_SSL_PROTO_DTLS */ - if( conf->psk != NULL && conf->psk_len != 0 ) - return( 1 ); + /* Change state now, so that it is right in mbedtls_ssl_read_record(), used + * by DTLS for dropping out-of-sequence ChangeCipherSpec records */ +#if defined(MBEDTLS_SSL_SESSION_TICKETS) + if( ssl->state == MBEDTLS_SSL_SERVER_CHANGE_CIPHER_SPEC && + ssl->handshake->new_session_ticket != 0 ) + { + ssl->state = MBEDTLS_SSL_SERVER_NEW_SESSION_TICKET; + } +#endif -#if defined(MBEDTLS_USE_PSA_CRYPTO) - if( conf->psk_opaque != 0 ) - return( 1 ); -#endif /* MBEDTLS_USE_PSA_CRYPTO */ + switch( ssl->state ) + { + case MBEDTLS_SSL_HELLO_REQUEST: + ssl->state = MBEDTLS_SSL_CLIENT_HELLO; + break; - return( 0 ); + /* + * ==> ClientHello + */ + case MBEDTLS_SSL_CLIENT_HELLO: + ret = ssl_write_client_hello( ssl ); + break; + + /* + * <== ServerHello + * Certificate + * ( ServerKeyExchange ) + * ( CertificateRequest ) + * ServerHelloDone + */ + case MBEDTLS_SSL_SERVER_HELLO: + ret = ssl_parse_server_hello( ssl ); + break; + + case MBEDTLS_SSL_SERVER_CERTIFICATE: + ret = mbedtls_ssl_parse_certificate( ssl ); + break; + + case MBEDTLS_SSL_SERVER_KEY_EXCHANGE: + ret = ssl_parse_server_key_exchange( ssl ); + break; + + case MBEDTLS_SSL_CERTIFICATE_REQUEST: + ret = ssl_parse_certificate_request( ssl ); + break; + + case MBEDTLS_SSL_SERVER_HELLO_DONE: + ret = ssl_parse_server_hello_done( ssl ); + break; + + /* + * ==> ( Certificate/Alert ) + * ClientKeyExchange + * ( CertificateVerify ) + * ChangeCipherSpec + * Finished + */ + case MBEDTLS_SSL_CLIENT_CERTIFICATE: + ret = mbedtls_ssl_write_certificate( ssl ); + break; + + case MBEDTLS_SSL_CLIENT_KEY_EXCHANGE: + ret = ssl_write_client_key_exchange( ssl ); + break; + + case MBEDTLS_SSL_CERTIFICATE_VERIFY: + ret = ssl_write_certificate_verify( ssl ); + break; + + case MBEDTLS_SSL_CLIENT_CHANGE_CIPHER_SPEC: + ret = mbedtls_ssl_write_change_cipher_spec( ssl ); + break; + + case MBEDTLS_SSL_CLIENT_FINISHED: + ret = mbedtls_ssl_write_finished( ssl ); + break; + + /* + * <== ( NewSessionTicket ) + * ChangeCipherSpec + * Finished + */ +#if defined(MBEDTLS_SSL_SESSION_TICKETS) + case MBEDTLS_SSL_SERVER_NEW_SESSION_TICKET: + ret = ssl_parse_new_session_ticket( ssl ); + break; +#endif + + case MBEDTLS_SSL_SERVER_CHANGE_CIPHER_SPEC: + ret = mbedtls_ssl_parse_change_cipher_spec( ssl ); + break; + + case MBEDTLS_SSL_SERVER_FINISHED: + ret = mbedtls_ssl_parse_finished( ssl ); + break; + + case MBEDTLS_SSL_FLUSH_BUFFERS: + MBEDTLS_SSL_DEBUG_MSG( 2, ( "handshake: done" ) ); + ssl->state = MBEDTLS_SSL_HANDSHAKE_WRAPUP; + break; + + case MBEDTLS_SSL_HANDSHAKE_WRAPUP: + mbedtls_ssl_handshake_wrapup( ssl ); + break; + + default: + MBEDTLS_SSL_DEBUG_MSG( 1, ( "invalid state %d", ssl->state ) ); + return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); + } + + return( ret ); } -#if defined(MBEDTLS_USE_PSA_CRYPTO) -static int ssl_conf_has_static_raw_psk( mbedtls_ssl_config const *conf ) -{ - if( conf->psk_identity == NULL || - conf->psk_identity_len == 0 ) - { - return( 0 ); - } - - if( conf->psk != NULL && conf->psk_len != 0 ) - return( 1 ); - - return( 0 ); -} -#endif /* MBEDTLS_USE_PSA_CRYPTO */ - -#endif /* MBEDTLS_KEY_EXCHANGE__SOME__PSK_ENABLED */ +/* + * ClientHello/ServerHello extension functions. + */ #if defined(MBEDTLS_SSL_SERVER_NAME_INDICATION) static void ssl_write_hostname_ext( mbedtls_ssl_context *ssl, @@ -395,6 +516,48 @@ static void ssl_write_supported_point_formats_ext( mbedtls_ssl_context *ssl, *olen = 6; } + +static int ssl_parse_supported_point_formats_ext( mbedtls_ssl_context *ssl, + const unsigned char *buf, + size_t len ) +{ + size_t list_size; + const unsigned char *p; + + if( len == 0 || (size_t)( buf[0] + 1 ) != len ) + { + MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad server hello message" ) ); + mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, + MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR ); + return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO ); + } + list_size = buf[0]; + + p = buf + 1; + while( list_size > 0 ) + { + if( p[0] == MBEDTLS_ECP_PF_UNCOMPRESSED || + p[0] == MBEDTLS_ECP_PF_COMPRESSED ) + { +#if defined(MBEDTLS_ECDH_C) || defined(MBEDTLS_ECDSA_C) + ssl->handshake->ecdh_ctx.point_format = p[0]; +#endif +#if defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED) + ssl->handshake->ecjpake_ctx.point_format = p[0]; +#endif + MBEDTLS_SSL_DEBUG_MSG( 4, ( "point format selected: %d", p[0] ) ); + return( 0 ); + } + + list_size--; + p++; + } + + MBEDTLS_SSL_DEBUG_MSG( 1, ( "no point format in common" ) ); + mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, + MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE ); + return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO ); +} #endif /* MBEDTLS_ECDH_C || MBEDTLS_ECDSA_C || MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED */ @@ -474,6 +637,36 @@ static void ssl_write_ecjpake_kkpp_ext( mbedtls_ssl_context *ssl, *olen = kkpp_len + 4; } + +static int ssl_parse_ecjpake_kkpp( mbedtls_ssl_context *ssl, + const unsigned char *buf, + size_t len ) +{ + int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; + + if( ssl->handshake->ciphersuite_info->key_exchange != + MBEDTLS_KEY_EXCHANGE_ECJPAKE ) + { + MBEDTLS_SSL_DEBUG_MSG( 3, ( "skip ecjpake kkpp extension" ) ); + return( 0 ); + } + + /* If we got here, we no longer need our cached extension */ + mbedtls_free( ssl->handshake->ecjpake_cache ); + ssl->handshake->ecjpake_cache = NULL; + ssl->handshake->ecjpake_cache_len = 0; + + if( ( ret = mbedtls_ecjpake_read_round_one( &ssl->handshake->ecjpake_ctx, + buf, len ) ) != 0 ) + { + MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ecjpake_read_round_one", ret ); + mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, + MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE ); + return( ret ); + } + + return( 0 ); +} #endif /* MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED */ #if defined(MBEDTLS_SSL_DTLS_CONNECTION_ID) @@ -522,6 +715,60 @@ static void ssl_write_cid_ext( mbedtls_ssl_context *ssl, *olen = ssl->own_cid_len + 5; } + +static int ssl_parse_cid_ext( mbedtls_ssl_context *ssl, + const unsigned char *buf, + size_t len ) +{ + size_t peer_cid_len; + + if( /* CID extension only makes sense in DTLS */ + ssl->conf->transport != MBEDTLS_SSL_TRANSPORT_DATAGRAM || + /* The server must only send the CID extension if we have offered it. */ + ssl->negotiate_cid == MBEDTLS_SSL_CID_DISABLED ) + { + MBEDTLS_SSL_DEBUG_MSG( 1, ( "CID extension unexpected" ) ); + mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, + MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE ); + return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO ); + } + + if( len == 0 ) + { + MBEDTLS_SSL_DEBUG_MSG( 1, ( "CID extension invalid" ) ); + mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, + MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE ); + return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO ); + } + + peer_cid_len = *buf++; + len--; + + if( peer_cid_len > MBEDTLS_SSL_CID_OUT_LEN_MAX ) + { + MBEDTLS_SSL_DEBUG_MSG( 1, ( "CID extension invalid" ) ); + mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, + MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE ); + return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO ); + } + + if( len != peer_cid_len ) + { + MBEDTLS_SSL_DEBUG_MSG( 1, ( "CID extension invalid" ) ); + mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, + MBEDTLS_SSL_ALERT_MSG_ILLEGAL_PARAMETER ); + return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO ); + } + + ssl->handshake->cid_in_use = MBEDTLS_SSL_CID_ENABLED; + ssl->handshake->peer_cid_len = (uint8_t) peer_cid_len; + memcpy( ssl->handshake->peer_cid, buf, peer_cid_len ); + + MBEDTLS_SSL_DEBUG_MSG( 3, ( "Use of CID extension negotiated" ) ); + MBEDTLS_SSL_DEBUG_BUF( 3, "Server CID", buf, peer_cid_len ); + + return( 0 ); +} #endif /* MBEDTLS_SSL_DTLS_CONNECTION_ID */ #if defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH) @@ -556,6 +803,27 @@ static void ssl_write_max_fragment_length_ext( mbedtls_ssl_context *ssl, *olen = 5; } + +static int ssl_parse_max_fragment_length_ext( mbedtls_ssl_context *ssl, + const unsigned char *buf, + size_t len ) +{ + /* + * server should use the extension only if we did, + * and if so the server's value should match ours (and len is always 1) + */ + if( ssl->conf->mfl_code == MBEDTLS_SSL_MAX_FRAG_LEN_NONE || + len != 1 || + buf[0] != ssl->conf->mfl_code ) + { + MBEDTLS_SSL_DEBUG_MSG( 1, ( "non-matching max fragment length extension" ) ); + mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, + MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE ); + return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO ); + } + + return( 0 ); +} #endif /* MBEDTLS_SSL_MAX_FRAGMENT_LENGTH */ #if defined(MBEDTLS_SSL_TRUNCATED_HMAC) @@ -588,6 +856,26 @@ static void ssl_write_truncated_hmac_ext( mbedtls_ssl_context *ssl, *olen = 4; } + +static int ssl_parse_truncated_hmac_ext( mbedtls_ssl_context *ssl, + const unsigned char *buf, + size_t len ) +{ + if( ssl->conf->trunc_hmac == MBEDTLS_SSL_TRUNC_HMAC_DISABLED || + len != 0 ) + { + MBEDTLS_SSL_DEBUG_MSG( 1, ( "non-matching truncated HMAC extension" ) ); + mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, + MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE ); + return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO ); + } + + ((void) buf); + + ssl->session_negotiate->trunc_hmac = MBEDTLS_SSL_TRUNC_HMAC_ENABLED; + + return( 0 ); +} #endif /* MBEDTLS_SSL_TRUNCATED_HMAC */ #if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC) @@ -622,6 +910,27 @@ static void ssl_write_encrypt_then_mac_ext( mbedtls_ssl_context *ssl, *olen = 4; } + +static int ssl_parse_encrypt_then_mac_ext( mbedtls_ssl_context *ssl, + const unsigned char *buf, + size_t len ) +{ + if( ssl->conf->encrypt_then_mac == MBEDTLS_SSL_ETM_DISABLED || + ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 || + len != 0 ) + { + MBEDTLS_SSL_DEBUG_MSG( 1, ( "non-matching encrypt-then-MAC extension" ) ); + mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, + MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE ); + return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO ); + } + + ((void) buf); + + ssl->session_negotiate->encrypt_then_mac = MBEDTLS_SSL_ETM_ENABLED; + + return( 0 ); +} #endif /* MBEDTLS_SSL_ENCRYPT_THEN_MAC */ #if defined(MBEDTLS_SSL_EXTENDED_MASTER_SECRET) @@ -656,6 +965,27 @@ static void ssl_write_extended_ms_ext( mbedtls_ssl_context *ssl, *olen = 4; } + +static int ssl_parse_extended_ms_ext( mbedtls_ssl_context *ssl, + const unsigned char *buf, + size_t len ) +{ + if( ssl->conf->extended_ms == MBEDTLS_SSL_EXTENDED_MS_DISABLED || + ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 || + len != 0 ) + { + MBEDTLS_SSL_DEBUG_MSG( 1, ( "non-matching extended master secret extension" ) ); + mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, + MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE ); + return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO ); + } + + ((void) buf); + + ssl->handshake->extended_ms = MBEDTLS_SSL_EXTENDED_MS_ENABLED; + + return( 0 ); +} #endif /* MBEDTLS_SSL_EXTENDED_MASTER_SECRET */ #if defined(MBEDTLS_SSL_SESSION_TICKETS) @@ -700,6 +1030,26 @@ static void ssl_write_session_ticket_ext( mbedtls_ssl_context *ssl, *olen += tlen; } + +static int ssl_parse_session_ticket_ext( mbedtls_ssl_context *ssl, + const unsigned char *buf, + size_t len ) +{ + if( ssl->conf->session_tickets == MBEDTLS_SSL_SESSION_TICKETS_DISABLED || + len != 0 ) + { + MBEDTLS_SSL_DEBUG_MSG( 1, ( "non-matching session ticket extension" ) ); + mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, + MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE ); + return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO ); + } + + ((void) buf); + + ssl->handshake->new_session_ticket = 1; + + return( 0 ); +} #endif /* MBEDTLS_SSL_SESSION_TICKETS */ #if defined(MBEDTLS_SSL_ALPN) @@ -760,102 +1110,162 @@ static void ssl_write_alpn_ext( mbedtls_ssl_context *ssl, buf[2] = (unsigned char)( ( ( *olen - 4 ) >> 8 ) & 0xFF ); buf[3] = (unsigned char)( ( ( *olen - 4 ) ) & 0xFF ); } -#endif /* MBEDTLS_SSL_ALPN */ -/* - * Generate random bytes for ClientHello - */ -static int ssl_generate_random( mbedtls_ssl_context *ssl ) +static int ssl_parse_alpn_ext( mbedtls_ssl_context *ssl, + const unsigned char *buf, size_t len ) { - int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; - unsigned char *p = ssl->handshake->randbytes; -#if defined(MBEDTLS_HAVE_TIME) - mbedtls_time_t t; -#endif + size_t list_len, name_len; + const char **p; + + /* If we didn't send it, the server shouldn't send it */ + if( ssl->conf->alpn_list == NULL ) + { + MBEDTLS_SSL_DEBUG_MSG( 1, ( "non-matching ALPN extension" ) ); + mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, + MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE ); + return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO ); + } /* - * When responding to a verify request, MUST reuse random (RFC 6347 4.2.1) + * opaque ProtocolName<1..2^8-1>; + * + * struct { + * ProtocolName protocol_name_list<2..2^16-1> + * } ProtocolNameList; + * + * the "ProtocolNameList" MUST contain exactly one "ProtocolName" */ -#if defined(MBEDTLS_SSL_PROTO_DTLS) - if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM && - ssl->handshake->verify_cookie != NULL ) + + /* Min length is 2 (list_len) + 1 (name_len) + 1 (name) */ + if( len < 4 ) + { + mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, + MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR ); + return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO ); + } + + list_len = ( buf[0] << 8 ) | buf[1]; + if( list_len != len - 2 ) + { + mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, + MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR ); + return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO ); + } + + name_len = buf[2]; + if( name_len != list_len - 1 ) + { + mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, + MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR ); + return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO ); + } + + /* Check that the server chosen protocol was in our list and save it */ + for( p = ssl->conf->alpn_list; *p != NULL; p++ ) + { + if( name_len == strlen( *p ) && + memcmp( buf + 3, *p, name_len ) == 0 ) + { + ssl->alpn_chosen = *p; + return( 0 ); + } + } + + MBEDTLS_SSL_DEBUG_MSG( 1, ( "ALPN extension: no matching protocol" ) ); + mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, + MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE ); + return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO ); +} +#endif /* MBEDTLS_SSL_ALPN */ + +static int ssl_parse_renegotiation_info( mbedtls_ssl_context *ssl, + const unsigned char *buf, + size_t len ) +{ +#if defined(MBEDTLS_SSL_RENEGOTIATION) + if( ssl->renego_status != MBEDTLS_SSL_INITIAL_HANDSHAKE ) + { + /* Check verify-data in constant-time. The length OTOH is no secret */ + if( len != 1 + ssl->verify_data_len * 2 || + buf[0] != ssl->verify_data_len * 2 || + mbedtls_ssl_safer_memcmp( buf + 1, + ssl->own_verify_data, ssl->verify_data_len ) != 0 || + mbedtls_ssl_safer_memcmp( buf + 1 + ssl->verify_data_len, + ssl->peer_verify_data, ssl->verify_data_len ) != 0 ) + { + MBEDTLS_SSL_DEBUG_MSG( 1, ( "non-matching renegotiation info" ) ); + mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, + MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE ); + return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO ); + } + } + else +#endif /* MBEDTLS_SSL_RENEGOTIATION */ + { + if( len != 1 || buf[0] != 0x00 ) + { + MBEDTLS_SSL_DEBUG_MSG( 1, ( "non-zero length renegotiation info" ) ); + mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, + MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE ); + return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO ); + } + + ssl->secure_renegotiation = MBEDTLS_SSL_SECURE_RENEGOTIATION; + } + + return( 0 ); +} + +/* + * Uncategorized helpers + */ + +#if defined(MBEDTLS_KEY_EXCHANGE__SOME__PSK_ENABLED) +static int ssl_conf_has_static_psk( mbedtls_ssl_config const *conf ) +{ + if( conf->psk_identity == NULL || + conf->psk_identity_len == 0 ) { return( 0 ); } -#endif -#if defined(MBEDTLS_HAVE_TIME) - t = mbedtls_time( NULL ); - *p++ = (unsigned char)( t >> 24 ); - *p++ = (unsigned char)( t >> 16 ); - *p++ = (unsigned char)( t >> 8 ); - *p++ = (unsigned char)( t ); + if( conf->psk != NULL && conf->psk_len != 0 ) + return( 1 ); - MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello, current time: %lu", t ) ); -#else - if( ( ret = ssl->conf->f_rng( ssl->conf->p_rng, p, 4 ) ) != 0 ) - return( ret ); - - p += 4; -#endif /* MBEDTLS_HAVE_TIME */ - - if( ( ret = ssl->conf->f_rng( ssl->conf->p_rng, p, 28 ) ) != 0 ) - return( ret ); +#if defined(MBEDTLS_USE_PSA_CRYPTO) + if( conf->psk_opaque != 0 ) + return( 1 ); +#endif /* MBEDTLS_USE_PSA_CRYPTO */ return( 0 ); } -/** - * \brief Validate cipher suite against config in SSL context. - * - * \param suite_info cipher suite to validate - * \param ssl SSL context - * \param min_minor_ver Minimal minor version to accept a cipher suite - * \param max_minor_ver Maximal minor version to accept a cipher suite - * - * \return 0 if valid, else 1 - */ -static int ssl_validate_ciphersuite( const mbedtls_ssl_ciphersuite_t * suite_info, - const mbedtls_ssl_context * ssl, - int min_minor_ver, int max_minor_ver ) +#if defined(MBEDTLS_USE_PSA_CRYPTO) +static int ssl_conf_has_static_raw_psk( mbedtls_ssl_config const *conf ) { - (void) ssl; - if( suite_info == NULL ) - return( 1 ); - - if( suite_info->min_minor_ver > max_minor_ver || - suite_info->max_minor_ver < min_minor_ver ) - return( 1 ); - -#if defined(MBEDTLS_SSL_PROTO_DTLS) - if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM && - ( suite_info->flags & MBEDTLS_CIPHERSUITE_NODTLS ) ) - return( 1 ); -#endif - -#if defined(MBEDTLS_ARC4_C) - if( ssl->conf->arc4_disabled == MBEDTLS_SSL_ARC4_DISABLED && - suite_info->cipher == MBEDTLS_CIPHER_ARC4_128 ) - return( 1 ); -#endif - -#if defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED) - if( suite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECJPAKE && - mbedtls_ecjpake_check( &ssl->handshake->ecjpake_ctx ) != 0 ) - return( 1 ); -#endif - - /* Don't suggest PSK-based ciphersuite if no PSK is available. */ -#if defined(MBEDTLS_KEY_EXCHANGE__SOME__PSK_ENABLED) - if( mbedtls_ssl_ciphersuite_uses_psk( suite_info ) && - ssl_conf_has_static_psk( ssl->conf ) == 0 ) + if( conf->psk_identity == NULL || + conf->psk_identity_len == 0 ) { - return( 1 ); + return( 0 ); } + + if( conf->psk != NULL && conf->psk_len != 0 ) + return( 1 ); + + return( 0 ); +} +#endif /* MBEDTLS_USE_PSA_CRYPTO */ #endif /* MBEDTLS_KEY_EXCHANGE__SOME__PSK_ENABLED */ - return( 0 ); -} +/* + * CLIENT HANDSHAKE STATE: Outgoing ClientHello + */ + +static int ssl_validate_ciphersuite( const mbedtls_ssl_ciphersuite_t * suite_info, + const mbedtls_ssl_context * ssl, + int min_minor_ver, int max_minor_ver ); + +static int ssl_generate_random( mbedtls_ssl_context *ssl ); static int ssl_write_client_hello( mbedtls_ssl_context *ssl ) { @@ -1213,358 +1623,104 @@ static int ssl_write_client_hello( mbedtls_ssl_context *ssl ) return( 0 ); } -static int ssl_parse_renegotiation_info( mbedtls_ssl_context *ssl, - const unsigned char *buf, - size_t len ) -{ -#if defined(MBEDTLS_SSL_RENEGOTIATION) - if( ssl->renego_status != MBEDTLS_SSL_INITIAL_HANDSHAKE ) - { - /* Check verify-data in constant-time. The length OTOH is no secret */ - if( len != 1 + ssl->verify_data_len * 2 || - buf[0] != ssl->verify_data_len * 2 || - mbedtls_ssl_safer_memcmp( buf + 1, - ssl->own_verify_data, ssl->verify_data_len ) != 0 || - mbedtls_ssl_safer_memcmp( buf + 1 + ssl->verify_data_len, - ssl->peer_verify_data, ssl->verify_data_len ) != 0 ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "non-matching renegotiation info" ) ); - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE ); - return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO ); - } - } - else -#endif /* MBEDTLS_SSL_RENEGOTIATION */ - { - if( len != 1 || buf[0] != 0x00 ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "non-zero length renegotiation info" ) ); - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE ); - return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO ); - } - - ssl->secure_renegotiation = MBEDTLS_SSL_SECURE_RENEGOTIATION; - } - - return( 0 ); -} - -#if defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH) -static int ssl_parse_max_fragment_length_ext( mbedtls_ssl_context *ssl, - const unsigned char *buf, - size_t len ) -{ - /* - * server should use the extension only if we did, - * and if so the server's value should match ours (and len is always 1) - */ - if( ssl->conf->mfl_code == MBEDTLS_SSL_MAX_FRAG_LEN_NONE || - len != 1 || - buf[0] != ssl->conf->mfl_code ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "non-matching max fragment length extension" ) ); - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE ); - return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO ); - } - - return( 0 ); -} -#endif /* MBEDTLS_SSL_MAX_FRAGMENT_LENGTH */ - -#if defined(MBEDTLS_SSL_TRUNCATED_HMAC) -static int ssl_parse_truncated_hmac_ext( mbedtls_ssl_context *ssl, - const unsigned char *buf, - size_t len ) -{ - if( ssl->conf->trunc_hmac == MBEDTLS_SSL_TRUNC_HMAC_DISABLED || - len != 0 ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "non-matching truncated HMAC extension" ) ); - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE ); - return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO ); - } - - ((void) buf); - - ssl->session_negotiate->trunc_hmac = MBEDTLS_SSL_TRUNC_HMAC_ENABLED; - - return( 0 ); -} -#endif /* MBEDTLS_SSL_TRUNCATED_HMAC */ - -#if defined(MBEDTLS_SSL_DTLS_CONNECTION_ID) -static int ssl_parse_cid_ext( mbedtls_ssl_context *ssl, - const unsigned char *buf, - size_t len ) -{ - size_t peer_cid_len; - - if( /* CID extension only makes sense in DTLS */ - ssl->conf->transport != MBEDTLS_SSL_TRANSPORT_DATAGRAM || - /* The server must only send the CID extension if we have offered it. */ - ssl->negotiate_cid == MBEDTLS_SSL_CID_DISABLED ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "CID extension unexpected" ) ); - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE ); - return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO ); - } - - if( len == 0 ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "CID extension invalid" ) ); - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE ); - return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO ); - } - - peer_cid_len = *buf++; - len--; - - if( peer_cid_len > MBEDTLS_SSL_CID_OUT_LEN_MAX ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "CID extension invalid" ) ); - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE ); - return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO ); - } - - if( len != peer_cid_len ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "CID extension invalid" ) ); - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_ILLEGAL_PARAMETER ); - return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO ); - } - - ssl->handshake->cid_in_use = MBEDTLS_SSL_CID_ENABLED; - ssl->handshake->peer_cid_len = (uint8_t) peer_cid_len; - memcpy( ssl->handshake->peer_cid, buf, peer_cid_len ); - - MBEDTLS_SSL_DEBUG_MSG( 3, ( "Use of CID extension negotiated" ) ); - MBEDTLS_SSL_DEBUG_BUF( 3, "Server CID", buf, peer_cid_len ); - - return( 0 ); -} -#endif /* MBEDTLS_SSL_DTLS_CONNECTION_ID */ - -#if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC) -static int ssl_parse_encrypt_then_mac_ext( mbedtls_ssl_context *ssl, - const unsigned char *buf, - size_t len ) -{ - if( ssl->conf->encrypt_then_mac == MBEDTLS_SSL_ETM_DISABLED || - ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 || - len != 0 ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "non-matching encrypt-then-MAC extension" ) ); - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE ); - return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO ); - } - - ((void) buf); - - ssl->session_negotiate->encrypt_then_mac = MBEDTLS_SSL_ETM_ENABLED; - - return( 0 ); -} -#endif /* MBEDTLS_SSL_ENCRYPT_THEN_MAC */ - -#if defined(MBEDTLS_SSL_EXTENDED_MASTER_SECRET) -static int ssl_parse_extended_ms_ext( mbedtls_ssl_context *ssl, - const unsigned char *buf, - size_t len ) -{ - if( ssl->conf->extended_ms == MBEDTLS_SSL_EXTENDED_MS_DISABLED || - ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 || - len != 0 ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "non-matching extended master secret extension" ) ); - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE ); - return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO ); - } - - ((void) buf); - - ssl->handshake->extended_ms = MBEDTLS_SSL_EXTENDED_MS_ENABLED; - - return( 0 ); -} -#endif /* MBEDTLS_SSL_EXTENDED_MASTER_SECRET */ - -#if defined(MBEDTLS_SSL_SESSION_TICKETS) -static int ssl_parse_session_ticket_ext( mbedtls_ssl_context *ssl, - const unsigned char *buf, - size_t len ) -{ - if( ssl->conf->session_tickets == MBEDTLS_SSL_SESSION_TICKETS_DISABLED || - len != 0 ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "non-matching session ticket extension" ) ); - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE ); - return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO ); - } - - ((void) buf); - - ssl->handshake->new_session_ticket = 1; - - return( 0 ); -} -#endif /* MBEDTLS_SSL_SESSION_TICKETS */ - -#if defined(MBEDTLS_ECDH_C) || defined(MBEDTLS_ECDSA_C) || \ - defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED) -static int ssl_parse_supported_point_formats_ext( mbedtls_ssl_context *ssl, - const unsigned char *buf, - size_t len ) -{ - size_t list_size; - const unsigned char *p; - - if( len == 0 || (size_t)( buf[0] + 1 ) != len ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad server hello message" ) ); - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR ); - return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO ); - } - list_size = buf[0]; - - p = buf + 1; - while( list_size > 0 ) - { - if( p[0] == MBEDTLS_ECP_PF_UNCOMPRESSED || - p[0] == MBEDTLS_ECP_PF_COMPRESSED ) - { -#if defined(MBEDTLS_ECDH_C) || defined(MBEDTLS_ECDSA_C) - ssl->handshake->ecdh_ctx.point_format = p[0]; -#endif -#if defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED) - ssl->handshake->ecjpake_ctx.point_format = p[0]; -#endif - MBEDTLS_SSL_DEBUG_MSG( 4, ( "point format selected: %d", p[0] ) ); - return( 0 ); - } - - list_size--; - p++; - } - - MBEDTLS_SSL_DEBUG_MSG( 1, ( "no point format in common" ) ); - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE ); - return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO ); -} -#endif /* MBEDTLS_ECDH_C || MBEDTLS_ECDSA_C || - MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED */ - -#if defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED) -static int ssl_parse_ecjpake_kkpp( mbedtls_ssl_context *ssl, - const unsigned char *buf, - size_t len ) +/* + * Generate random bytes for ClientHello + */ +static int ssl_generate_random( mbedtls_ssl_context *ssl ) { int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; + unsigned char *p = ssl->handshake->randbytes; +#if defined(MBEDTLS_HAVE_TIME) + mbedtls_time_t t; +#endif - if( ssl->handshake->ciphersuite_info->key_exchange != - MBEDTLS_KEY_EXCHANGE_ECJPAKE ) + /* + * When responding to a verify request, MUST reuse random (RFC 6347 4.2.1) + */ +#if defined(MBEDTLS_SSL_PROTO_DTLS) + if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM && + ssl->handshake->verify_cookie != NULL ) { - MBEDTLS_SSL_DEBUG_MSG( 3, ( "skip ecjpake kkpp extension" ) ); return( 0 ); } +#endif - /* If we got here, we no longer need our cached extension */ - mbedtls_free( ssl->handshake->ecjpake_cache ); - ssl->handshake->ecjpake_cache = NULL; - ssl->handshake->ecjpake_cache_len = 0; +#if defined(MBEDTLS_HAVE_TIME) + t = mbedtls_time( NULL ); + *p++ = (unsigned char)( t >> 24 ); + *p++ = (unsigned char)( t >> 16 ); + *p++ = (unsigned char)( t >> 8 ); + *p++ = (unsigned char)( t ); - if( ( ret = mbedtls_ecjpake_read_round_one( &ssl->handshake->ecjpake_ctx, - buf, len ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ecjpake_read_round_one", ret ); - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE ); + MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello, current time: %lu", t ) ); +#else + if( ( ret = ssl->conf->f_rng( ssl->conf->p_rng, p, 4 ) ) != 0 ) + return( ret ); + + p += 4; +#endif /* MBEDTLS_HAVE_TIME */ + + if( ( ret = ssl->conf->f_rng( ssl->conf->p_rng, p, 28 ) ) != 0 ) return( ret ); - } return( 0 ); } -#endif /* MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED */ -#if defined(MBEDTLS_SSL_ALPN) -static int ssl_parse_alpn_ext( mbedtls_ssl_context *ssl, - const unsigned char *buf, size_t len ) +/** + * \brief Validate cipher suite against config in SSL context. + * + * \param suite_info cipher suite to validate + * \param ssl SSL context + * \param min_minor_ver Minimal minor version to accept a cipher suite + * \param max_minor_ver Maximal minor version to accept a cipher suite + * + * \return 0 if valid, else 1 + */ +static int ssl_validate_ciphersuite( const mbedtls_ssl_ciphersuite_t * suite_info, + const mbedtls_ssl_context * ssl, + int min_minor_ver, int max_minor_ver ) { - size_t list_len, name_len; - const char **p; + (void) ssl; + if( suite_info == NULL ) + return( 1 ); - /* If we didn't send it, the server shouldn't send it */ - if( ssl->conf->alpn_list == NULL ) + if( suite_info->min_minor_ver > max_minor_ver || + suite_info->max_minor_ver < min_minor_ver ) + return( 1 ); + +#if defined(MBEDTLS_SSL_PROTO_DTLS) + if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM && + ( suite_info->flags & MBEDTLS_CIPHERSUITE_NODTLS ) ) + return( 1 ); +#endif + +#if defined(MBEDTLS_ARC4_C) + if( ssl->conf->arc4_disabled == MBEDTLS_SSL_ARC4_DISABLED && + suite_info->cipher == MBEDTLS_CIPHER_ARC4_128 ) + return( 1 ); +#endif + +#if defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED) + if( suite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECJPAKE && + mbedtls_ecjpake_check( &ssl->handshake->ecjpake_ctx ) != 0 ) + return( 1 ); +#endif + + /* Don't suggest PSK-based ciphersuite if no PSK is available. */ +#if defined(MBEDTLS_KEY_EXCHANGE__SOME__PSK_ENABLED) + if( mbedtls_ssl_ciphersuite_uses_psk( suite_info ) && + ssl_conf_has_static_psk( ssl->conf ) == 0 ) { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "non-matching ALPN extension" ) ); - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE ); - return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO ); + return( 1 ); } +#endif /* MBEDTLS_KEY_EXCHANGE__SOME__PSK_ENABLED */ - /* - * opaque ProtocolName<1..2^8-1>; - * - * struct { - * ProtocolName protocol_name_list<2..2^16-1> - * } ProtocolNameList; - * - * the "ProtocolNameList" MUST contain exactly one "ProtocolName" - */ - - /* Min length is 2 (list_len) + 1 (name_len) + 1 (name) */ - if( len < 4 ) - { - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR ); - return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO ); - } - - list_len = ( buf[0] << 8 ) | buf[1]; - if( list_len != len - 2 ) - { - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR ); - return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO ); - } - - name_len = buf[2]; - if( name_len != list_len - 1 ) - { - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR ); - return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO ); - } - - /* Check that the server chosen protocol was in our list and save it */ - for( p = ssl->conf->alpn_list; *p != NULL; p++ ) - { - if( name_len == strlen( *p ) && - memcmp( buf + 3, *p, name_len ) == 0 ) - { - ssl->alpn_chosen = *p; - return( 0 ); - } - } - - MBEDTLS_SSL_DEBUG_MSG( 1, ( "ALPN extension: no matching protocol" ) ); - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE ); - return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO ); + return( 0 ); } -#endif /* MBEDTLS_SSL_ALPN */ + +/* + * CLIENT HANDSHAKE STATE: Incoming `HelloVerifyRequest` + */ /* * Parse HelloVerifyRequest. Only called after verifying the HS type. @@ -1641,6 +1797,10 @@ static int ssl_parse_hello_verify_request( mbedtls_ssl_context *ssl ) } #endif /* MBEDTLS_SSL_PROTO_DTLS */ +/* + * CLIENT HANDSHAKE STATE: Incoming `ServerHello` + */ + static int ssl_parse_server_hello( mbedtls_ssl_context *ssl ) { int ret, i; @@ -2154,319 +2314,23 @@ static int ssl_parse_server_hello( mbedtls_ssl_context *ssl ) return( 0 ); } -#if defined(MBEDTLS_KEY_EXCHANGE_DHE_RSA_ENABLED) || \ - defined(MBEDTLS_KEY_EXCHANGE_DHE_PSK_ENABLED) -static int ssl_parse_server_dh_params( mbedtls_ssl_context *ssl, unsigned char **p, - unsigned char *end ) -{ - int ret = MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE; - - /* - * Ephemeral DH parameters: - * - * struct { - * opaque dh_p<1..2^16-1>; - * opaque dh_g<1..2^16-1>; - * opaque dh_Ys<1..2^16-1>; - * } ServerDHParams; - */ - if( ( ret = mbedtls_dhm_read_params( &ssl->handshake->dhm_ctx, p, end ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 2, ( "mbedtls_dhm_read_params" ), ret ); - return( ret ); - } - - if( ssl->handshake->dhm_ctx.len * 8 < ssl->conf->dhm_min_bitlen ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "DHM prime too short: %d < %d", - ssl->handshake->dhm_ctx.len * 8, - ssl->conf->dhm_min_bitlen ) ); - return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_KEY_EXCHANGE ); - } - - MBEDTLS_SSL_DEBUG_MPI( 3, "DHM: P ", &ssl->handshake->dhm_ctx.P ); - MBEDTLS_SSL_DEBUG_MPI( 3, "DHM: G ", &ssl->handshake->dhm_ctx.G ); - MBEDTLS_SSL_DEBUG_MPI( 3, "DHM: GY", &ssl->handshake->dhm_ctx.GY ); - - return( ret ); -} -#endif /* MBEDTLS_KEY_EXCHANGE_DHE_RSA_ENABLED || - MBEDTLS_KEY_EXCHANGE_DHE_PSK_ENABLED */ - -#if defined(MBEDTLS_KEY_EXCHANGE_ECDHE_RSA_ENABLED) || \ - defined(MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED) || \ - defined(MBEDTLS_KEY_EXCHANGE_ECDHE_PSK_ENABLED) || \ - defined(MBEDTLS_KEY_EXCHANGE_ECDH_RSA_ENABLED) || \ - defined(MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA_ENABLED) -static int ssl_check_server_ecdh_params( const mbedtls_ssl_context *ssl ) -{ - const mbedtls_ecp_curve_info *curve_info; - mbedtls_ecp_group_id grp_id; -#if defined(MBEDTLS_ECDH_LEGACY_CONTEXT) - grp_id = ssl->handshake->ecdh_ctx.grp.id; -#else - grp_id = ssl->handshake->ecdh_ctx.grp_id; -#endif - - curve_info = mbedtls_ecp_curve_info_from_grp_id( grp_id ); - if( curve_info == NULL ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) ); - return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); - } - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "ECDH curve: %s", curve_info->name ) ); - -#if defined(MBEDTLS_ECP_C) - if( mbedtls_ssl_check_curve( ssl, grp_id ) != 0 ) -#else - if( ssl->handshake->ecdh_ctx.grp.nbits < 163 || - ssl->handshake->ecdh_ctx.grp.nbits > 521 ) -#endif - return( -1 ); - - MBEDTLS_SSL_DEBUG_ECDH( 3, &ssl->handshake->ecdh_ctx, - MBEDTLS_DEBUG_ECDH_QP ); - - return( 0 ); -} -#endif /* MBEDTLS_KEY_EXCHANGE_ECDHE_RSA_ENABLED || - MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED || - MBEDTLS_KEY_EXCHANGE_ECDHE_PSK_ENABLED || - MBEDTLS_KEY_EXCHANGE_ECDH_RSA_ENABLED || - MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA_ENABLED */ - -#if defined(MBEDTLS_USE_PSA_CRYPTO) && \ - ( defined(MBEDTLS_KEY_EXCHANGE_ECDHE_RSA_ENABLED) || \ - defined(MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED) ) -static int ssl_parse_server_ecdh_params_psa( mbedtls_ssl_context *ssl, - unsigned char **p, - unsigned char *end ) -{ - uint16_t tls_id; - size_t ecdh_bits = 0; - uint8_t ecpoint_len; - mbedtls_ssl_handshake_params *handshake = ssl->handshake; - - /* - * Parse ECC group - */ - - if( end - *p < 4 ) - return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_KEY_EXCHANGE ); - - /* First byte is curve_type; only named_curve is handled */ - if( *(*p)++ != MBEDTLS_ECP_TLS_NAMED_CURVE ) - return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_KEY_EXCHANGE ); - - /* Next two bytes are the namedcurve value */ - tls_id = *(*p)++; - tls_id <<= 8; - tls_id |= *(*p)++; - - /* Convert EC group to PSA key type. */ - if( ( handshake->ecdh_psa_type = - mbedtls_psa_parse_tls_ecc_group( tls_id, &ecdh_bits ) ) == 0 ) - { - return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_KEY_EXCHANGE ); - } - if( ecdh_bits > 0xffff ) - return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_KEY_EXCHANGE ); - handshake->ecdh_bits = (uint16_t) ecdh_bits; - - /* - * Put peer's ECDH public key in the format understood by PSA. - */ - - ecpoint_len = *(*p)++; - if( (size_t)( end - *p ) < ecpoint_len ) - return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_KEY_EXCHANGE ); - - if( mbedtls_psa_tls_ecpoint_to_psa_ec( - *p, ecpoint_len, - handshake->ecdh_psa_peerkey, - sizeof( handshake->ecdh_psa_peerkey ), - &handshake->ecdh_psa_peerkey_len ) != 0 ) - { - return( MBEDTLS_ERR_SSL_HW_ACCEL_FAILED ); - } - - *p += ecpoint_len; - return( 0 ); -} -#endif /* MBEDTLS_USE_PSA_CRYPTO && - ( MBEDTLS_KEY_EXCHANGE_ECDHE_RSA_ENABLED || - MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED ) */ - -#if defined(MBEDTLS_KEY_EXCHANGE_ECDHE_RSA_ENABLED) || \ - defined(MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED) || \ - defined(MBEDTLS_KEY_EXCHANGE_ECDHE_PSK_ENABLED) -static int ssl_parse_server_ecdh_params( mbedtls_ssl_context *ssl, - unsigned char **p, - unsigned char *end ) -{ - int ret = MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE; - - /* - * Ephemeral ECDH parameters: - * - * struct { - * ECParameters curve_params; - * ECPoint public; - * } ServerECDHParams; - */ - if( ( ret = mbedtls_ecdh_read_params( &ssl->handshake->ecdh_ctx, - (const unsigned char **) p, end ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, ( "mbedtls_ecdh_read_params" ), ret ); -#if defined(MBEDTLS_SSL__ECP_RESTARTABLE) - if( ret == MBEDTLS_ERR_ECP_IN_PROGRESS ) - ret = MBEDTLS_ERR_SSL_CRYPTO_IN_PROGRESS; -#endif - return( ret ); - } - - if( ssl_check_server_ecdh_params( ssl ) != 0 ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad server key exchange message (ECDHE curve)" ) ); - return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_KEY_EXCHANGE ); - } - - return( ret ); -} -#endif /* MBEDTLS_KEY_EXCHANGE_ECDHE_RSA_ENABLED || - MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED || - MBEDTLS_KEY_EXCHANGE_ECDHE_PSK_ENABLED */ - -#if defined(MBEDTLS_KEY_EXCHANGE__SOME__PSK_ENABLED) -static int ssl_parse_server_psk_hint( mbedtls_ssl_context *ssl, - unsigned char **p, - unsigned char *end ) -{ - int ret = MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE; - size_t len; - ((void) ssl); - - /* - * PSK parameters: - * - * opaque psk_identity_hint<0..2^16-1>; - */ - if( end - (*p) < 2 ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad server key exchange message " - "(psk_identity_hint length)" ) ); - return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_KEY_EXCHANGE ); - } - len = (*p)[0] << 8 | (*p)[1]; - *p += 2; - - if( end - (*p) < (int) len ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad server key exchange message " - "(psk_identity_hint length)" ) ); - return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_KEY_EXCHANGE ); - } - - /* - * Note: we currently ignore the PKS identity hint, as we only allow one - * PSK to be provisionned on the client. This could be changed later if - * someone needs that feature. - */ - *p += len; - ret = 0; - - return( ret ); -} -#endif /* MBEDTLS_KEY_EXCHANGE__SOME__PSK_ENABLED */ - -#if defined(MBEDTLS_KEY_EXCHANGE_RSA_ENABLED) || \ - defined(MBEDTLS_KEY_EXCHANGE_RSA_PSK_ENABLED) /* - * Generate a pre-master secret and encrypt it with the server's RSA key + * CLIENT HANDSHAKE STATE: Incoming `Certificate` + * + * This is shared with the server-side and implemented in ssl_12_gen.c. */ -static int ssl_write_encrypted_pms( mbedtls_ssl_context *ssl, - size_t offset, size_t *olen, - size_t pms_offset ) -{ - int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; - size_t len_bytes = ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 ? 0 : 2; - unsigned char *p = ssl->handshake->premaster + pms_offset; - mbedtls_pk_context * peer_pk; - if( offset + len_bytes > MBEDTLS_SSL_OUT_CONTENT_LEN ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "buffer too small for encrypted pms" ) ); - return( MBEDTLS_ERR_SSL_BUFFER_TOO_SMALL ); - } +/* + * CLIENT HANDSHAKE STATE: Incoming `ServerKeyExchange` + */ - /* - * Generate (part of) the pre-master as - * struct { - * ProtocolVersion client_version; - * opaque random[46]; - * } PreMasterSecret; - */ - mbedtls_ssl_write_version( ssl->conf->max_major_ver, ssl->conf->max_minor_ver, - ssl->conf->transport, p ); +/* Some forward declarations for the parsing function. */ - if( ( ret = ssl->conf->f_rng( ssl->conf->p_rng, p + 2, 46 ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "f_rng", ret ); - return( ret ); - } - - ssl->handshake->pmslen = 48; - -#if !defined(MBEDTLS_SSL_KEEP_PEER_CERTIFICATE) - peer_pk = &ssl->handshake->peer_pubkey; -#else /* !MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */ - if( ssl->session_negotiate->peer_cert == NULL ) - { - /* Should never happen */ - MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) ); - return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); - } - peer_pk = &ssl->session_negotiate->peer_cert->pk; -#endif /* MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */ - - /* - * Now write it out, encrypted - */ - if( ! mbedtls_pk_can_do( peer_pk, MBEDTLS_PK_RSA ) ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "certificate key type mismatch" ) ); - return( MBEDTLS_ERR_SSL_PK_TYPE_MISMATCH ); - } - - if( ( ret = mbedtls_pk_encrypt( peer_pk, - p, ssl->handshake->pmslen, - ssl->out_msg + offset + len_bytes, olen, - MBEDTLS_SSL_OUT_CONTENT_LEN - offset - len_bytes, - ssl->conf->f_rng, ssl->conf->p_rng ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_rsa_pkcs1_encrypt", ret ); - return( ret ); - } - -#if defined(MBEDTLS_SSL_PROTO_TLS1) || defined(MBEDTLS_SSL_PROTO_TLS1_1) || \ - defined(MBEDTLS_SSL_PROTO_TLS1_2) - if( len_bytes == 2 ) - { - ssl->out_msg[offset+0] = (unsigned char)( *olen >> 8 ); - ssl->out_msg[offset+1] = (unsigned char)( *olen ); - *olen += 2; - } -#endif - -#if !defined(MBEDTLS_SSL_KEEP_PEER_CERTIFICATE) - /* We don't need the peer's public key anymore. Free it. */ - mbedtls_pk_free( peer_pk ); -#endif /* !MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */ - return( 0 ); -} -#endif /* MBEDTLS_KEY_EXCHANGE_RSA_ENABLED || - MBEDTLS_KEY_EXCHANGE_RSA_PSK_ENABLED */ +#if defined(MBEDTLS_KEY_EXCHANGE_ECDH_RSA_ENABLED) || \ + defined(MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA_ENABLED) +static int ssl_get_ecdh_params_from_cert( mbedtls_ssl_context *ssl ); +#endif /* MBEDTLS_KEY_EXCHANGE_ECDH_RSA_ENABLED) || + MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA_ENABLED */ #if defined(MBEDTLS_SSL_PROTO_TLS1_2) #if defined(MBEDTLS_KEY_EXCHANGE_DHE_RSA_ENABLED) || \ @@ -2476,113 +2340,55 @@ static int ssl_parse_signature_algorithm( mbedtls_ssl_context *ssl, unsigned char **p, unsigned char *end, mbedtls_md_type_t *md_alg, - mbedtls_pk_type_t *pk_alg ) -{ - ((void) ssl); - *md_alg = MBEDTLS_MD_NONE; - *pk_alg = MBEDTLS_PK_NONE; - - /* Only in TLS 1.2 */ - if( ssl->minor_ver != MBEDTLS_SSL_MINOR_VERSION_3 ) - { - return( 0 ); - } - - if( (*p) + 2 > end ) - return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_KEY_EXCHANGE ); - - /* - * Get hash algorithm - */ - if( ( *md_alg = mbedtls_ssl_md_alg_from_hash( (*p)[0] ) ) == MBEDTLS_MD_NONE ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "Server used unsupported " - "HashAlgorithm %d", *(p)[0] ) ); - return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_KEY_EXCHANGE ); - } - - /* - * Get signature algorithm - */ - if( ( *pk_alg = mbedtls_ssl_pk_alg_from_sig( (*p)[1] ) ) == MBEDTLS_PK_NONE ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "server used unsupported " - "SignatureAlgorithm %d", (*p)[1] ) ); - return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_KEY_EXCHANGE ); - } - - /* - * Check if the hash is acceptable - */ - if( mbedtls_ssl_check_sig_hash( ssl, *md_alg ) != 0 ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "server used HashAlgorithm %d that was not offered", - *(p)[0] ) ); - return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_KEY_EXCHANGE ); - } - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "Server used SignatureAlgorithm %d", (*p)[1] ) ); - MBEDTLS_SSL_DEBUG_MSG( 2, ( "Server used HashAlgorithm %d", (*p)[0] ) ); - *p += 2; - - return( 0 ); -} + mbedtls_pk_type_t *pk_alg ); #endif /* MBEDTLS_KEY_EXCHANGE_DHE_RSA_ENABLED || MBEDTLS_KEY_EXCHANGE_ECDHE_RSA_ENABLED || MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED */ #endif /* MBEDTLS_SSL_PROTO_TLS1_2 */ -#if defined(MBEDTLS_KEY_EXCHANGE_ECDH_RSA_ENABLED) || \ +#if defined(MBEDTLS_KEY_EXCHANGE__SOME__PSK_ENABLED) +static int ssl_parse_server_psk_hint( mbedtls_ssl_context *ssl, + unsigned char **p, + unsigned char *end ); +#endif /* MBEDTLS_KEY_EXCHANGE__SOME__PSK_ENABLED */ + +#if defined(MBEDTLS_KEY_EXCHANGE_ECDHE_RSA_ENABLED) || \ + defined(MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED) || \ + defined(MBEDTLS_KEY_EXCHANGE_ECDHE_PSK_ENABLED) +static int ssl_parse_server_ecdh_params( mbedtls_ssl_context *ssl, + unsigned char **p, + unsigned char *end ); +#endif /* MBEDTLS_KEY_EXCHANGE_ECDHE_RSA_ENABLED || + MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED || + MBEDTLS_KEY_EXCHANGE_ECDHE_PSK_ENABLED */ + +#if defined(MBEDTLS_USE_PSA_CRYPTO) && \ + ( defined(MBEDTLS_KEY_EXCHANGE_ECDHE_RSA_ENABLED) || \ + defined(MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED) ) +static int ssl_parse_server_ecdh_params_psa( mbedtls_ssl_context *ssl, + unsigned char **p, + unsigned char *end ); +#endif /* MBEDTLS_USE_PSA_CRYPTO && + ( MBEDTLS_KEY_EXCHANGE_ECDHE_RSA_ENABLED || + MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED ) */ + +#if defined(MBEDTLS_KEY_EXCHANGE_DHE_RSA_ENABLED) || \ + defined(MBEDTLS_KEY_EXCHANGE_DHE_PSK_ENABLED) +static int ssl_parse_server_dh_params( mbedtls_ssl_context *ssl, unsigned char **p, + unsigned char *end ); +#endif /* MBEDTLS_KEY_EXCHANGE_DHE_RSA_ENABLED || + MBEDTLS_KEY_EXCHANGE_DHE_PSK_ENABLED */ + +#if defined(MBEDTLS_KEY_EXCHANGE_ECDHE_RSA_ENABLED) || \ + defined(MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED) || \ + defined(MBEDTLS_KEY_EXCHANGE_ECDHE_PSK_ENABLED) || \ + defined(MBEDTLS_KEY_EXCHANGE_ECDH_RSA_ENABLED) || \ defined(MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA_ENABLED) -static int ssl_get_ecdh_params_from_cert( mbedtls_ssl_context *ssl ) -{ - int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; - const mbedtls_ecp_keypair *peer_key; - mbedtls_pk_context * peer_pk; - -#if !defined(MBEDTLS_SSL_KEEP_PEER_CERTIFICATE) - peer_pk = &ssl->handshake->peer_pubkey; -#else /* !MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */ - if( ssl->session_negotiate->peer_cert == NULL ) - { - /* Should never happen */ - MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) ); - return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); - } - peer_pk = &ssl->session_negotiate->peer_cert->pk; -#endif /* MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */ - - if( ! mbedtls_pk_can_do( peer_pk, MBEDTLS_PK_ECKEY ) ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "server key not ECDH capable" ) ); - return( MBEDTLS_ERR_SSL_PK_TYPE_MISMATCH ); - } - - peer_key = mbedtls_pk_ec( *peer_pk ); - - if( ( ret = mbedtls_ecdh_get_params( &ssl->handshake->ecdh_ctx, peer_key, - MBEDTLS_ECDH_THEIRS ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, ( "mbedtls_ecdh_get_params" ), ret ); - return( ret ); - } - - if( ssl_check_server_ecdh_params( ssl ) != 0 ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad server certificate (ECDH curve)" ) ); - return( MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE ); - } - -#if !defined(MBEDTLS_SSL_KEEP_PEER_CERTIFICATE) - /* We don't need the peer's public key anymore. Free it, - * so that more RAM is available for upcoming expensive - * operations like ECDHE. */ - mbedtls_pk_free( peer_pk ); -#endif /* !MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */ - - return( ret ); -} -#endif /* MBEDTLS_KEY_EXCHANGE_ECDH_RSA_ENABLED) || +static int ssl_check_server_ecdh_params( const mbedtls_ssl_context *ssl ); +#endif /* MBEDTLS_KEY_EXCHANGE_ECDHE_RSA_ENABLED || + MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED || + MBEDTLS_KEY_EXCHANGE_ECDHE_PSK_ENABLED || + MBEDTLS_KEY_EXCHANGE_ECDH_RSA_ENABLED || MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA_ENABLED */ static int ssl_parse_server_key_exchange( mbedtls_ssl_context *ssl ) @@ -2955,6 +2761,353 @@ exit: return( 0 ); } +#if defined(MBEDTLS_KEY_EXCHANGE_DHE_RSA_ENABLED) || \ + defined(MBEDTLS_KEY_EXCHANGE_DHE_PSK_ENABLED) +static int ssl_parse_server_dh_params( mbedtls_ssl_context *ssl, unsigned char **p, + unsigned char *end ) +{ + int ret = MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE; + + /* + * Ephemeral DH parameters: + * + * struct { + * opaque dh_p<1..2^16-1>; + * opaque dh_g<1..2^16-1>; + * opaque dh_Ys<1..2^16-1>; + * } ServerDHParams; + */ + if( ( ret = mbedtls_dhm_read_params( &ssl->handshake->dhm_ctx, p, end ) ) != 0 ) + { + MBEDTLS_SSL_DEBUG_RET( 2, ( "mbedtls_dhm_read_params" ), ret ); + return( ret ); + } + + if( ssl->handshake->dhm_ctx.len * 8 < ssl->conf->dhm_min_bitlen ) + { + MBEDTLS_SSL_DEBUG_MSG( 1, ( "DHM prime too short: %d < %d", + ssl->handshake->dhm_ctx.len * 8, + ssl->conf->dhm_min_bitlen ) ); + return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_KEY_EXCHANGE ); + } + + MBEDTLS_SSL_DEBUG_MPI( 3, "DHM: P ", &ssl->handshake->dhm_ctx.P ); + MBEDTLS_SSL_DEBUG_MPI( 3, "DHM: G ", &ssl->handshake->dhm_ctx.G ); + MBEDTLS_SSL_DEBUG_MPI( 3, "DHM: GY", &ssl->handshake->dhm_ctx.GY ); + + return( ret ); +} +#endif /* MBEDTLS_KEY_EXCHANGE_DHE_RSA_ENABLED || + MBEDTLS_KEY_EXCHANGE_DHE_PSK_ENABLED */ + +#if defined(MBEDTLS_KEY_EXCHANGE_ECDHE_RSA_ENABLED) || \ + defined(MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED) || \ + defined(MBEDTLS_KEY_EXCHANGE_ECDHE_PSK_ENABLED) || \ + defined(MBEDTLS_KEY_EXCHANGE_ECDH_RSA_ENABLED) || \ + defined(MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA_ENABLED) +static int ssl_check_server_ecdh_params( const mbedtls_ssl_context *ssl ) +{ + const mbedtls_ecp_curve_info *curve_info; + mbedtls_ecp_group_id grp_id; +#if defined(MBEDTLS_ECDH_LEGACY_CONTEXT) + grp_id = ssl->handshake->ecdh_ctx.grp.id; +#else + grp_id = ssl->handshake->ecdh_ctx.grp_id; +#endif + + curve_info = mbedtls_ecp_curve_info_from_grp_id( grp_id ); + if( curve_info == NULL ) + { + MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) ); + return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); + } + + MBEDTLS_SSL_DEBUG_MSG( 2, ( "ECDH curve: %s", curve_info->name ) ); + +#if defined(MBEDTLS_ECP_C) + if( mbedtls_ssl_check_curve( ssl, grp_id ) != 0 ) +#else + if( ssl->handshake->ecdh_ctx.grp.nbits < 163 || + ssl->handshake->ecdh_ctx.grp.nbits > 521 ) +#endif + return( -1 ); + + MBEDTLS_SSL_DEBUG_ECDH( 3, &ssl->handshake->ecdh_ctx, + MBEDTLS_DEBUG_ECDH_QP ); + + return( 0 ); +} +#endif /* MBEDTLS_KEY_EXCHANGE_ECDHE_RSA_ENABLED || + MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED || + MBEDTLS_KEY_EXCHANGE_ECDHE_PSK_ENABLED || + MBEDTLS_KEY_EXCHANGE_ECDH_RSA_ENABLED || + MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA_ENABLED */ + +#if defined(MBEDTLS_USE_PSA_CRYPTO) && \ + ( defined(MBEDTLS_KEY_EXCHANGE_ECDHE_RSA_ENABLED) || \ + defined(MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED) ) +static int ssl_parse_server_ecdh_params_psa( mbedtls_ssl_context *ssl, + unsigned char **p, + unsigned char *end ) +{ + uint16_t tls_id; + size_t ecdh_bits = 0; + uint8_t ecpoint_len; + mbedtls_ssl_handshake_params *handshake = ssl->handshake; + + /* + * Parse ECC group + */ + + if( end - *p < 4 ) + return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_KEY_EXCHANGE ); + + /* First byte is curve_type; only named_curve is handled */ + if( *(*p)++ != MBEDTLS_ECP_TLS_NAMED_CURVE ) + return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_KEY_EXCHANGE ); + + /* Next two bytes are the namedcurve value */ + tls_id = *(*p)++; + tls_id <<= 8; + tls_id |= *(*p)++; + + /* Convert EC group to PSA key type. */ + if( ( handshake->ecdh_psa_type = + mbedtls_psa_parse_tls_ecc_group( tls_id, &ecdh_bits ) ) == 0 ) + { + return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_KEY_EXCHANGE ); + } + if( ecdh_bits > 0xffff ) + return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_KEY_EXCHANGE ); + handshake->ecdh_bits = (uint16_t) ecdh_bits; + + /* + * Put peer's ECDH public key in the format understood by PSA. + */ + + ecpoint_len = *(*p)++; + if( (size_t)( end - *p ) < ecpoint_len ) + return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_KEY_EXCHANGE ); + + if( mbedtls_psa_tls_ecpoint_to_psa_ec( + *p, ecpoint_len, + handshake->ecdh_psa_peerkey, + sizeof( handshake->ecdh_psa_peerkey ), + &handshake->ecdh_psa_peerkey_len ) != 0 ) + { + return( MBEDTLS_ERR_SSL_HW_ACCEL_FAILED ); + } + + *p += ecpoint_len; + return( 0 ); +} +#endif /* MBEDTLS_USE_PSA_CRYPTO && + ( MBEDTLS_KEY_EXCHANGE_ECDHE_RSA_ENABLED || + MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED ) */ + +#if defined(MBEDTLS_KEY_EXCHANGE_ECDHE_RSA_ENABLED) || \ + defined(MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED) || \ + defined(MBEDTLS_KEY_EXCHANGE_ECDHE_PSK_ENABLED) +static int ssl_parse_server_ecdh_params( mbedtls_ssl_context *ssl, + unsigned char **p, + unsigned char *end ) +{ + int ret = MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE; + + /* + * Ephemeral ECDH parameters: + * + * struct { + * ECParameters curve_params; + * ECPoint public; + * } ServerECDHParams; + */ + if( ( ret = mbedtls_ecdh_read_params( &ssl->handshake->ecdh_ctx, + (const unsigned char **) p, end ) ) != 0 ) + { + MBEDTLS_SSL_DEBUG_RET( 1, ( "mbedtls_ecdh_read_params" ), ret ); +#if defined(MBEDTLS_SSL__ECP_RESTARTABLE) + if( ret == MBEDTLS_ERR_ECP_IN_PROGRESS ) + ret = MBEDTLS_ERR_SSL_CRYPTO_IN_PROGRESS; +#endif + return( ret ); + } + + if( ssl_check_server_ecdh_params( ssl ) != 0 ) + { + MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad server key exchange message (ECDHE curve)" ) ); + return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_KEY_EXCHANGE ); + } + + return( ret ); +} +#endif /* MBEDTLS_KEY_EXCHANGE_ECDHE_RSA_ENABLED || + MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED || + MBEDTLS_KEY_EXCHANGE_ECDHE_PSK_ENABLED */ + +#if defined(MBEDTLS_KEY_EXCHANGE__SOME__PSK_ENABLED) +static int ssl_parse_server_psk_hint( mbedtls_ssl_context *ssl, + unsigned char **p, + unsigned char *end ) +{ + int ret = MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE; + size_t len; + ((void) ssl); + + /* + * PSK parameters: + * + * opaque psk_identity_hint<0..2^16-1>; + */ + if( end - (*p) < 2 ) + { + MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad server key exchange message " + "(psk_identity_hint length)" ) ); + return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_KEY_EXCHANGE ); + } + len = (*p)[0] << 8 | (*p)[1]; + *p += 2; + + if( end - (*p) < (int) len ) + { + MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad server key exchange message " + "(psk_identity_hint length)" ) ); + return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_KEY_EXCHANGE ); + } + + /* + * Note: we currently ignore the PKS identity hint, as we only allow one + * PSK to be provisionned on the client. This could be changed later if + * someone needs that feature. + */ + *p += len; + ret = 0; + + return( ret ); +} +#endif /* MBEDTLS_KEY_EXCHANGE__SOME__PSK_ENABLED */ + +#if defined(MBEDTLS_KEY_EXCHANGE_ECDH_RSA_ENABLED) || \ + defined(MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA_ENABLED) +static int ssl_get_ecdh_params_from_cert( mbedtls_ssl_context *ssl ) +{ + int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; + const mbedtls_ecp_keypair *peer_key; + mbedtls_pk_context * peer_pk; + +#if !defined(MBEDTLS_SSL_KEEP_PEER_CERTIFICATE) + peer_pk = &ssl->handshake->peer_pubkey; +#else /* !MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */ + if( ssl->session_negotiate->peer_cert == NULL ) + { + /* Should never happen */ + MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) ); + return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); + } + peer_pk = &ssl->session_negotiate->peer_cert->pk; +#endif /* MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */ + + if( ! mbedtls_pk_can_do( peer_pk, MBEDTLS_PK_ECKEY ) ) + { + MBEDTLS_SSL_DEBUG_MSG( 1, ( "server key not ECDH capable" ) ); + return( MBEDTLS_ERR_SSL_PK_TYPE_MISMATCH ); + } + + peer_key = mbedtls_pk_ec( *peer_pk ); + + if( ( ret = mbedtls_ecdh_get_params( &ssl->handshake->ecdh_ctx, peer_key, + MBEDTLS_ECDH_THEIRS ) ) != 0 ) + { + MBEDTLS_SSL_DEBUG_RET( 1, ( "mbedtls_ecdh_get_params" ), ret ); + return( ret ); + } + + if( ssl_check_server_ecdh_params( ssl ) != 0 ) + { + MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad server certificate (ECDH curve)" ) ); + return( MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE ); + } + +#if !defined(MBEDTLS_SSL_KEEP_PEER_CERTIFICATE) + /* We don't need the peer's public key anymore. Free it, + * so that more RAM is available for upcoming expensive + * operations like ECDHE. */ + mbedtls_pk_free( peer_pk ); +#endif /* !MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */ + + return( ret ); +} +#endif /* MBEDTLS_KEY_EXCHANGE_ECDH_RSA_ENABLED) || + MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA_ENABLED */ + +#if defined(MBEDTLS_SSL_PROTO_TLS1_2) +#if defined(MBEDTLS_KEY_EXCHANGE_DHE_RSA_ENABLED) || \ + defined(MBEDTLS_KEY_EXCHANGE_ECDHE_RSA_ENABLED) || \ + defined(MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED) +static int ssl_parse_signature_algorithm( mbedtls_ssl_context *ssl, + unsigned char **p, + unsigned char *end, + mbedtls_md_type_t *md_alg, + mbedtls_pk_type_t *pk_alg ) +{ + ((void) ssl); + *md_alg = MBEDTLS_MD_NONE; + *pk_alg = MBEDTLS_PK_NONE; + + /* Only in TLS 1.2 */ + if( ssl->minor_ver != MBEDTLS_SSL_MINOR_VERSION_3 ) + { + return( 0 ); + } + + if( (*p) + 2 > end ) + return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_KEY_EXCHANGE ); + + /* + * Get hash algorithm + */ + if( ( *md_alg = mbedtls_ssl_md_alg_from_hash( (*p)[0] ) ) == MBEDTLS_MD_NONE ) + { + MBEDTLS_SSL_DEBUG_MSG( 1, ( "Server used unsupported " + "HashAlgorithm %d", *(p)[0] ) ); + return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_KEY_EXCHANGE ); + } + + /* + * Get signature algorithm + */ + if( ( *pk_alg = mbedtls_ssl_pk_alg_from_sig( (*p)[1] ) ) == MBEDTLS_PK_NONE ) + { + MBEDTLS_SSL_DEBUG_MSG( 1, ( "server used unsupported " + "SignatureAlgorithm %d", (*p)[1] ) ); + return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_KEY_EXCHANGE ); + } + + /* + * Check if the hash is acceptable + */ + if( mbedtls_ssl_check_sig_hash( ssl, *md_alg ) != 0 ) + { + MBEDTLS_SSL_DEBUG_MSG( 1, ( "server used HashAlgorithm %d that was not offered", + *(p)[0] ) ); + return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_KEY_EXCHANGE ); + } + + MBEDTLS_SSL_DEBUG_MSG( 2, ( "Server used SignatureAlgorithm %d", (*p)[1] ) ); + MBEDTLS_SSL_DEBUG_MSG( 2, ( "Server used HashAlgorithm %d", (*p)[0] ) ); + *p += 2; + + return( 0 ); +} +#endif /* MBEDTLS_KEY_EXCHANGE_DHE_RSA_ENABLED || + MBEDTLS_KEY_EXCHANGE_ECDHE_RSA_ENABLED || + MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED */ +#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */ + +/* + * CLIENT HANDSHAKE STATE: Incoming `CertificateRequest` + */ + #if ! defined(MBEDTLS_KEY_EXCHANGE__CERT_REQ_ALLOWED__ENABLED) static int ssl_parse_certificate_request( mbedtls_ssl_context *ssl ) { @@ -3138,6 +3291,10 @@ exit: } #endif /* MBEDTLS_KEY_EXCHANGE__CERT_REQ_ALLOWED__ENABLED */ +/* + * CLIENT HANDSHAKE STATE: Incoming `ServerHelloDone` + */ + static int ssl_parse_server_hello_done( mbedtls_ssl_context *ssl ) { int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; @@ -3177,6 +3334,24 @@ static int ssl_parse_server_hello_done( mbedtls_ssl_context *ssl ) return( 0 ); } +/* + * CLIENT HANDSHAKE STATE: Outgoing `Certificate` + * + * This is shared with the server-side and implemented in ssl_12_gen.c. + */ + +/* + * CLIENT HANDSHAKE STATE: Outgoing `ClientKeyExchange` + */ + +#if defined(MBEDTLS_KEY_EXCHANGE_RSA_ENABLED) || \ + defined(MBEDTLS_KEY_EXCHANGE_RSA_PSK_ENABLED) +static int ssl_write_encrypted_pms( mbedtls_ssl_context *ssl, + size_t offset, size_t *olen, + size_t pms_offset ); +#endif /* MBEDTLS_KEY_EXCHANGE_RSA_ENABLED || + MBEDTLS_KEY_EXCHANGE_RSA_PSK_ENABLED */ + static int ssl_write_client_key_exchange( mbedtls_ssl_context *ssl ) { int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; @@ -3592,6 +3767,95 @@ ecdh_calc_secret: return( 0 ); } +#if defined(MBEDTLS_KEY_EXCHANGE_RSA_ENABLED) || \ + defined(MBEDTLS_KEY_EXCHANGE_RSA_PSK_ENABLED) +static int ssl_write_encrypted_pms( mbedtls_ssl_context *ssl, + size_t offset, size_t *olen, + size_t pms_offset ) +{ + int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; + size_t len_bytes = ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 ? 0 : 2; + unsigned char *p = ssl->handshake->premaster + pms_offset; + mbedtls_pk_context * peer_pk; + + if( offset + len_bytes > MBEDTLS_SSL_OUT_CONTENT_LEN ) + { + MBEDTLS_SSL_DEBUG_MSG( 1, ( "buffer too small for encrypted pms" ) ); + return( MBEDTLS_ERR_SSL_BUFFER_TOO_SMALL ); + } + + /* + * Generate (part of) the pre-master as + * struct { + * ProtocolVersion client_version; + * opaque random[46]; + * } PreMasterSecret; + */ + mbedtls_ssl_write_version( ssl->conf->max_major_ver, ssl->conf->max_minor_ver, + ssl->conf->transport, p ); + + if( ( ret = ssl->conf->f_rng( ssl->conf->p_rng, p + 2, 46 ) ) != 0 ) + { + MBEDTLS_SSL_DEBUG_RET( 1, "f_rng", ret ); + return( ret ); + } + + ssl->handshake->pmslen = 48; + +#if !defined(MBEDTLS_SSL_KEEP_PEER_CERTIFICATE) + peer_pk = &ssl->handshake->peer_pubkey; +#else /* !MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */ + if( ssl->session_negotiate->peer_cert == NULL ) + { + /* Should never happen */ + MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) ); + return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); + } + peer_pk = &ssl->session_negotiate->peer_cert->pk; +#endif /* MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */ + + /* + * Now write it out, encrypted + */ + if( ! mbedtls_pk_can_do( peer_pk, MBEDTLS_PK_RSA ) ) + { + MBEDTLS_SSL_DEBUG_MSG( 1, ( "certificate key type mismatch" ) ); + return( MBEDTLS_ERR_SSL_PK_TYPE_MISMATCH ); + } + + if( ( ret = mbedtls_pk_encrypt( peer_pk, + p, ssl->handshake->pmslen, + ssl->out_msg + offset + len_bytes, olen, + MBEDTLS_SSL_OUT_CONTENT_LEN - offset - len_bytes, + ssl->conf->f_rng, ssl->conf->p_rng ) ) != 0 ) + { + MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_rsa_pkcs1_encrypt", ret ); + return( ret ); + } + +#if defined(MBEDTLS_SSL_PROTO_TLS1) || defined(MBEDTLS_SSL_PROTO_TLS1_1) || \ + defined(MBEDTLS_SSL_PROTO_TLS1_2) + if( len_bytes == 2 ) + { + ssl->out_msg[offset+0] = (unsigned char)( *olen >> 8 ); + ssl->out_msg[offset+1] = (unsigned char)( *olen ); + *olen += 2; + } +#endif + +#if !defined(MBEDTLS_SSL_KEEP_PEER_CERTIFICATE) + /* We don't need the peer's public key anymore. Free it. */ + mbedtls_pk_free( peer_pk ); +#endif /* !MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */ + return( 0 ); +} +#endif /* MBEDTLS_KEY_EXCHANGE_RSA_ENABLED || + MBEDTLS_KEY_EXCHANGE_RSA_PSK_ENABLED */ + +/* + * CLIENT HANDSHAKE STATE: Outgoing `CertificateVerify` + */ + #if !defined(MBEDTLS_KEY_EXCHANGE__CERT_REQ_ALLOWED__ENABLED) static int ssl_write_certificate_verify( mbedtls_ssl_context *ssl ) { @@ -3789,6 +4053,16 @@ sign: } #endif /* MBEDTLS_KEY_EXCHANGE__CERT_REQ_ALLOWED__ENABLED */ +/* + * CLIENT HANDSHAKE STATE: Outgoing `Finished` + * + * This is shared with the server-side and implemented in ssl_12_gen.c. + */ + +/* + * CLIENT HANDSHAKE STATE: Incoming `NewSessionTicket` + */ + #if defined(MBEDTLS_SSL_SESSION_TICKETS) static int ssl_parse_new_session_ticket( mbedtls_ssl_context *ssl ) { @@ -3905,139 +4179,9 @@ static int ssl_parse_new_session_ticket( mbedtls_ssl_context *ssl ) #endif /* MBEDTLS_SSL_SESSION_TICKETS */ /* - * SSL handshake -- client side -- single step + * CLIENT HANDSHAKE IN: Finished + * + * This is shared with the server-side and implemented in ssl_12_gen.c. */ -int mbedtls_ssl_handshake_client_step( mbedtls_ssl_context *ssl ) -{ - int ret = 0; - if( ssl->state == MBEDTLS_SSL_HANDSHAKE_OVER || ssl->handshake == NULL ) - return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "client state: %d", ssl->state ) ); - - if( ( ret = mbedtls_ssl_flush_output( ssl ) ) != 0 ) - return( ret ); - -#if defined(MBEDTLS_SSL_PROTO_DTLS) - if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM && - ssl->handshake->retransmit_state == MBEDTLS_SSL_RETRANS_SENDING ) - { - if( ( ret = mbedtls_ssl_flight_transmit( ssl ) ) != 0 ) - return( ret ); - } -#endif /* MBEDTLS_SSL_PROTO_DTLS */ - - /* Change state now, so that it is right in mbedtls_ssl_read_record(), used - * by DTLS for dropping out-of-sequence ChangeCipherSpec records */ -#if defined(MBEDTLS_SSL_SESSION_TICKETS) - if( ssl->state == MBEDTLS_SSL_SERVER_CHANGE_CIPHER_SPEC && - ssl->handshake->new_session_ticket != 0 ) - { - ssl->state = MBEDTLS_SSL_SERVER_NEW_SESSION_TICKET; - } -#endif - - switch( ssl->state ) - { - case MBEDTLS_SSL_HELLO_REQUEST: - ssl->state = MBEDTLS_SSL_CLIENT_HELLO; - break; - - /* - * ==> ClientHello - */ - case MBEDTLS_SSL_CLIENT_HELLO: - ret = ssl_write_client_hello( ssl ); - break; - - /* - * <== ServerHello - * Certificate - * ( ServerKeyExchange ) - * ( CertificateRequest ) - * ServerHelloDone - */ - case MBEDTLS_SSL_SERVER_HELLO: - ret = ssl_parse_server_hello( ssl ); - break; - - case MBEDTLS_SSL_SERVER_CERTIFICATE: - ret = mbedtls_ssl_parse_certificate( ssl ); - break; - - case MBEDTLS_SSL_SERVER_KEY_EXCHANGE: - ret = ssl_parse_server_key_exchange( ssl ); - break; - - case MBEDTLS_SSL_CERTIFICATE_REQUEST: - ret = ssl_parse_certificate_request( ssl ); - break; - - case MBEDTLS_SSL_SERVER_HELLO_DONE: - ret = ssl_parse_server_hello_done( ssl ); - break; - - /* - * ==> ( Certificate/Alert ) - * ClientKeyExchange - * ( CertificateVerify ) - * ChangeCipherSpec - * Finished - */ - case MBEDTLS_SSL_CLIENT_CERTIFICATE: - ret = mbedtls_ssl_write_certificate( ssl ); - break; - - case MBEDTLS_SSL_CLIENT_KEY_EXCHANGE: - ret = ssl_write_client_key_exchange( ssl ); - break; - - case MBEDTLS_SSL_CERTIFICATE_VERIFY: - ret = ssl_write_certificate_verify( ssl ); - break; - - case MBEDTLS_SSL_CLIENT_CHANGE_CIPHER_SPEC: - ret = mbedtls_ssl_write_change_cipher_spec( ssl ); - break; - - case MBEDTLS_SSL_CLIENT_FINISHED: - ret = mbedtls_ssl_write_finished( ssl ); - break; - - /* - * <== ( NewSessionTicket ) - * ChangeCipherSpec - * Finished - */ -#if defined(MBEDTLS_SSL_SESSION_TICKETS) - case MBEDTLS_SSL_SERVER_NEW_SESSION_TICKET: - ret = ssl_parse_new_session_ticket( ssl ); - break; -#endif - - case MBEDTLS_SSL_SERVER_CHANGE_CIPHER_SPEC: - ret = mbedtls_ssl_parse_change_cipher_spec( ssl ); - break; - - case MBEDTLS_SSL_SERVER_FINISHED: - ret = mbedtls_ssl_parse_finished( ssl ); - break; - - case MBEDTLS_SSL_FLUSH_BUFFERS: - MBEDTLS_SSL_DEBUG_MSG( 2, ( "handshake: done" ) ); - ssl->state = MBEDTLS_SSL_HANDSHAKE_WRAPUP; - break; - - case MBEDTLS_SSL_HANDSHAKE_WRAPUP: - mbedtls_ssl_handshake_wrapup( ssl ); - break; - - default: - MBEDTLS_SSL_DEBUG_MSG( 1, ( "invalid state %d", ssl->state ) ); - return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); - } - - return( ret ); -} #endif /* MBEDTLS_SSL_CLI_C */ diff --git a/library/ssl_12_gen.c b/library/ssl_12_gen.c index ab9cb8986..af54bbe2c 100644 --- a/library/ssl_12_gen.c +++ b/library/ssl_12_gen.c @@ -1,5 +1,6 @@ /* - * SSLv3/TLSv1 shared functions + * Shared handshake reading/writing functions + * for TLS versions <= 1.2. * * Copyright (C) 2006-2015, ARM Limited, All Rights Reserved * SPDX-License-Identifier: Apache-2.0 @@ -18,14 +19,6 @@ * * This file is part of mbed TLS (https://tls.mbed.org) */ -/* - * The SSL 3.0 specification was drafted by Netscape in 1996, - * and became an IETF standard in 1999. - * - * http://wp.netscape.com/eng/ssl3/ - * http://www.ietf.org/rfc/rfc2246.txt - * http://www.ietf.org/rfc/rfc4346.txt - */ #if !defined(MBEDTLS_CONFIG_FILE) #include "mbedtls/config.h" @@ -33,8 +26,6 @@ #include MBEDTLS_CONFIG_FILE #endif -#if defined(MBEDTLS_SSL_TLS_C) - #if defined(MBEDTLS_PLATFORM_C) #include "mbedtls/platform.h" #else @@ -43,6 +34,8 @@ #define mbedtls_free free #endif +#if defined(MBEDTLS_SSL_TLS_C) + #include "mbedtls/ssl.h" #include "mbedtls/ssl_internal.h" #include "mbedtls/debug.h" @@ -61,1992 +54,12 @@ #include "mbedtls/oid.h" #endif -#if defined(MBEDTLS_SSL_PROTO_DTLS) - -#if defined(MBEDTLS_SSL_DTLS_CONNECTION_ID) -/* Top-level Connection ID API */ - -int mbedtls_ssl_conf_cid( mbedtls_ssl_config *conf, - size_t len, - int ignore_other_cid ) -{ - if( len > MBEDTLS_SSL_CID_IN_LEN_MAX ) - return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); - - if( ignore_other_cid != MBEDTLS_SSL_UNEXPECTED_CID_FAIL && - ignore_other_cid != MBEDTLS_SSL_UNEXPECTED_CID_IGNORE ) - { - return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); - } - - conf->ignore_unexpected_cid = ignore_other_cid; - conf->cid_len = len; - return( 0 ); -} - -int mbedtls_ssl_set_cid( mbedtls_ssl_context *ssl, - int enable, - unsigned char const *own_cid, - size_t own_cid_len ) -{ - if( ssl->conf->transport != MBEDTLS_SSL_TRANSPORT_DATAGRAM ) - return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); - - ssl->negotiate_cid = enable; - if( enable == MBEDTLS_SSL_CID_DISABLED ) - { - MBEDTLS_SSL_DEBUG_MSG( 3, ( "Disable use of CID extension." ) ); - return( 0 ); - } - MBEDTLS_SSL_DEBUG_MSG( 3, ( "Enable use of CID extension." ) ); - MBEDTLS_SSL_DEBUG_BUF( 3, "Own CID", own_cid, own_cid_len ); - - if( own_cid_len != ssl->conf->cid_len ) - { - MBEDTLS_SSL_DEBUG_MSG( 3, ( "CID length %u does not match CID length %u in config", - (unsigned) own_cid_len, - (unsigned) ssl->conf->cid_len ) ); - return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); - } - - memcpy( ssl->own_cid, own_cid, own_cid_len ); - /* Truncation is not an issue here because - * MBEDTLS_SSL_CID_IN_LEN_MAX at most 255. */ - ssl->own_cid_len = (uint8_t) own_cid_len; - - return( 0 ); -} - -int mbedtls_ssl_get_peer_cid( mbedtls_ssl_context *ssl, - int *enabled, - unsigned char peer_cid[ MBEDTLS_SSL_CID_OUT_LEN_MAX ], - size_t *peer_cid_len ) -{ - *enabled = MBEDTLS_SSL_CID_DISABLED; - - if( ssl->conf->transport != MBEDTLS_SSL_TRANSPORT_DATAGRAM || - ssl->state != MBEDTLS_SSL_HANDSHAKE_OVER ) - { - return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); - } - - /* We report MBEDTLS_SSL_CID_DISABLED in case the CID extensions - * were used, but client and server requested the empty CID. - * This is indistinguishable from not using the CID extension - * in the first place. */ - if( ssl->transform_in->in_cid_len == 0 && - ssl->transform_in->out_cid_len == 0 ) - { - return( 0 ); - } - - if( peer_cid_len != NULL ) - { - *peer_cid_len = ssl->transform_in->out_cid_len; - if( peer_cid != NULL ) - { - memcpy( peer_cid, ssl->transform_in->out_cid, - ssl->transform_in->out_cid_len ); - } - } - - *enabled = MBEDTLS_SSL_CID_ENABLED; - - return( 0 ); -} -#endif /* MBEDTLS_SSL_DTLS_CONNECTION_ID */ - -#endif /* MBEDTLS_SSL_PROTO_DTLS */ - -#if defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH) /* - * Convert max_fragment_length codes to length. - * RFC 6066 says: - * enum{ - * 2^9(1), 2^10(2), 2^11(3), 2^12(4), (255) - * } MaxFragmentLength; - * and we add 0 -> extension unused + * HANDSHAKE STATE: Outgoing `Certificate` */ -static unsigned int ssl_mfl_code_to_length( int mfl ) -{ - switch( mfl ) - { - case MBEDTLS_SSL_MAX_FRAG_LEN_NONE: - return ( MBEDTLS_TLS_EXT_ADV_CONTENT_LEN ); - case MBEDTLS_SSL_MAX_FRAG_LEN_512: - return 512; - case MBEDTLS_SSL_MAX_FRAG_LEN_1024: - return 1024; - case MBEDTLS_SSL_MAX_FRAG_LEN_2048: - return 2048; - case MBEDTLS_SSL_MAX_FRAG_LEN_4096: - return 4096; - default: - return ( MBEDTLS_TLS_EXT_ADV_CONTENT_LEN ); - } -} -#endif /* MBEDTLS_SSL_MAX_FRAGMENT_LENGTH */ -int mbedtls_ssl_session_copy( mbedtls_ssl_session *dst, - const mbedtls_ssl_session *src ) -{ - mbedtls_ssl_session_free( dst ); - memcpy( dst, src, sizeof( mbedtls_ssl_session ) ); - -#if defined(MBEDTLS_X509_CRT_PARSE_C) - -#if defined(MBEDTLS_SSL_KEEP_PEER_CERTIFICATE) - if( src->peer_cert != NULL ) - { - int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; - - dst->peer_cert = mbedtls_calloc( 1, sizeof(mbedtls_x509_crt) ); - if( dst->peer_cert == NULL ) - return( MBEDTLS_ERR_SSL_ALLOC_FAILED ); - - mbedtls_x509_crt_init( dst->peer_cert ); - - if( ( ret = mbedtls_x509_crt_parse_der( dst->peer_cert, src->peer_cert->raw.p, - src->peer_cert->raw.len ) ) != 0 ) - { - mbedtls_free( dst->peer_cert ); - dst->peer_cert = NULL; - return( ret ); - } - } -#else /* MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */ - if( src->peer_cert_digest != NULL ) - { - dst->peer_cert_digest = - mbedtls_calloc( 1, src->peer_cert_digest_len ); - if( dst->peer_cert_digest == NULL ) - return( MBEDTLS_ERR_SSL_ALLOC_FAILED ); - - memcpy( dst->peer_cert_digest, src->peer_cert_digest, - src->peer_cert_digest_len ); - dst->peer_cert_digest_type = src->peer_cert_digest_type; - dst->peer_cert_digest_len = src->peer_cert_digest_len; - } -#endif /* MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */ - -#endif /* MBEDTLS_X509_CRT_PARSE_C */ - -#if defined(MBEDTLS_SSL_SESSION_TICKETS) && defined(MBEDTLS_SSL_CLI_C) - if( src->ticket != NULL ) - { - dst->ticket = mbedtls_calloc( 1, src->ticket_len ); - if( dst->ticket == NULL ) - return( MBEDTLS_ERR_SSL_ALLOC_FAILED ); - - memcpy( dst->ticket, src->ticket, src->ticket_len ); - } -#endif /* MBEDTLS_SSL_SESSION_TICKETS && MBEDTLS_SSL_CLI_C */ - - return( 0 ); -} - -/* - * Key material generation - */ -#if defined(MBEDTLS_SSL_PROTO_SSL3) -static int ssl3_prf( const unsigned char *secret, size_t slen, - const char *label, - const unsigned char *random, size_t rlen, - unsigned char *dstbuf, size_t dlen ) -{ - int ret = 0; - size_t i; - mbedtls_md5_context md5; - mbedtls_sha1_context sha1; - unsigned char padding[16]; - unsigned char sha1sum[20]; - ((void)label); - - mbedtls_md5_init( &md5 ); - mbedtls_sha1_init( &sha1 ); - - /* - * SSLv3: - * block = - * MD5( secret + SHA1( 'A' + secret + random ) ) + - * MD5( secret + SHA1( 'BB' + secret + random ) ) + - * MD5( secret + SHA1( 'CCC' + secret + random ) ) + - * ... - */ - for( i = 0; i < dlen / 16; i++ ) - { - memset( padding, (unsigned char) ('A' + i), 1 + i ); - - if( ( ret = mbedtls_sha1_starts_ret( &sha1 ) ) != 0 ) - goto exit; - if( ( ret = mbedtls_sha1_update_ret( &sha1, padding, 1 + i ) ) != 0 ) - goto exit; - if( ( ret = mbedtls_sha1_update_ret( &sha1, secret, slen ) ) != 0 ) - goto exit; - if( ( ret = mbedtls_sha1_update_ret( &sha1, random, rlen ) ) != 0 ) - goto exit; - if( ( ret = mbedtls_sha1_finish_ret( &sha1, sha1sum ) ) != 0 ) - goto exit; - - if( ( ret = mbedtls_md5_starts_ret( &md5 ) ) != 0 ) - goto exit; - if( ( ret = mbedtls_md5_update_ret( &md5, secret, slen ) ) != 0 ) - goto exit; - if( ( ret = mbedtls_md5_update_ret( &md5, sha1sum, 20 ) ) != 0 ) - goto exit; - if( ( ret = mbedtls_md5_finish_ret( &md5, dstbuf + i * 16 ) ) != 0 ) - goto exit; - } - -exit: - mbedtls_md5_free( &md5 ); - mbedtls_sha1_free( &sha1 ); - - mbedtls_platform_zeroize( padding, sizeof( padding ) ); - mbedtls_platform_zeroize( sha1sum, sizeof( sha1sum ) ); - - return( ret ); -} -#endif /* MBEDTLS_SSL_PROTO_SSL3 */ - -#if defined(MBEDTLS_SSL_PROTO_TLS1) || defined(MBEDTLS_SSL_PROTO_TLS1_1) -static int tls1_prf( const unsigned char *secret, size_t slen, - const char *label, - const unsigned char *random, size_t rlen, - unsigned char *dstbuf, size_t dlen ) -{ - size_t nb, hs; - size_t i, j, k; - const unsigned char *S1, *S2; - unsigned char *tmp; - size_t tmp_len = 0; - unsigned char h_i[20]; - const mbedtls_md_info_t *md_info; - mbedtls_md_context_t md_ctx; - int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; - - mbedtls_md_init( &md_ctx ); - - tmp_len = 20 + strlen( label ) + rlen; - tmp = mbedtls_calloc( 1, tmp_len ); - if( tmp == NULL ) - { - ret = MBEDTLS_ERR_SSL_ALLOC_FAILED; - goto exit; - } - - hs = ( slen + 1 ) / 2; - S1 = secret; - S2 = secret + slen - hs; - - nb = strlen( label ); - memcpy( tmp + 20, label, nb ); - memcpy( tmp + 20 + nb, random, rlen ); - nb += rlen; - - /* - * First compute P_md5(secret,label+random)[0..dlen] - */ - if( ( md_info = mbedtls_md_info_from_type( MBEDTLS_MD_MD5 ) ) == NULL ) - { - ret = MBEDTLS_ERR_SSL_INTERNAL_ERROR; - goto exit; - } - - if( ( ret = mbedtls_md_setup( &md_ctx, md_info, 1 ) ) != 0 ) - { - goto exit; - } - - mbedtls_md_hmac_starts( &md_ctx, S1, hs ); - mbedtls_md_hmac_update( &md_ctx, tmp + 20, nb ); - mbedtls_md_hmac_finish( &md_ctx, 4 + tmp ); - - for( i = 0; i < dlen; i += 16 ) - { - mbedtls_md_hmac_reset ( &md_ctx ); - mbedtls_md_hmac_update( &md_ctx, 4 + tmp, 16 + nb ); - mbedtls_md_hmac_finish( &md_ctx, h_i ); - - mbedtls_md_hmac_reset ( &md_ctx ); - mbedtls_md_hmac_update( &md_ctx, 4 + tmp, 16 ); - mbedtls_md_hmac_finish( &md_ctx, 4 + tmp ); - - k = ( i + 16 > dlen ) ? dlen % 16 : 16; - - for( j = 0; j < k; j++ ) - dstbuf[i + j] = h_i[j]; - } - - mbedtls_md_free( &md_ctx ); - - /* - * XOR out with P_sha1(secret,label+random)[0..dlen] - */ - if( ( md_info = mbedtls_md_info_from_type( MBEDTLS_MD_SHA1 ) ) == NULL ) - { - ret = MBEDTLS_ERR_SSL_INTERNAL_ERROR; - goto exit; - } - - if( ( ret = mbedtls_md_setup( &md_ctx, md_info, 1 ) ) != 0 ) - { - goto exit; - } - - mbedtls_md_hmac_starts( &md_ctx, S2, hs ); - mbedtls_md_hmac_update( &md_ctx, tmp + 20, nb ); - mbedtls_md_hmac_finish( &md_ctx, tmp ); - - for( i = 0; i < dlen; i += 20 ) - { - mbedtls_md_hmac_reset ( &md_ctx ); - mbedtls_md_hmac_update( &md_ctx, tmp, 20 + nb ); - mbedtls_md_hmac_finish( &md_ctx, h_i ); - - mbedtls_md_hmac_reset ( &md_ctx ); - mbedtls_md_hmac_update( &md_ctx, tmp, 20 ); - mbedtls_md_hmac_finish( &md_ctx, tmp ); - - k = ( i + 20 > dlen ) ? dlen % 20 : 20; - - for( j = 0; j < k; j++ ) - dstbuf[i + j] = (unsigned char)( dstbuf[i + j] ^ h_i[j] ); - } - -exit: - mbedtls_md_free( &md_ctx ); - - mbedtls_platform_zeroize( tmp, tmp_len ); - mbedtls_platform_zeroize( h_i, sizeof( h_i ) ); - - mbedtls_free( tmp ); - return( ret ); -} -#endif /* MBEDTLS_SSL_PROTO_TLS1) || MBEDTLS_SSL_PROTO_TLS1_1 */ - -#if defined(MBEDTLS_SSL_PROTO_TLS1_2) -#if defined(MBEDTLS_USE_PSA_CRYPTO) - -static psa_status_t setup_psa_key_derivation( psa_key_derivation_operation_t* derivation, - psa_key_handle_t slot, - psa_algorithm_t alg, - const unsigned char* seed, size_t seed_length, - const unsigned char* label, size_t label_length, - size_t capacity ) -{ - psa_status_t status; - - status = psa_key_derivation_setup( derivation, alg ); - if( status != PSA_SUCCESS ) - return( status ); - - if( PSA_ALG_IS_TLS12_PRF( alg ) || PSA_ALG_IS_TLS12_PSK_TO_MS( alg ) ) - { - status = psa_key_derivation_input_bytes( derivation, - PSA_KEY_DERIVATION_INPUT_SEED, - seed, seed_length ); - if( status != PSA_SUCCESS ) - return( status ); - - if( slot == 0 ) - { - status = psa_key_derivation_input_bytes( - derivation, PSA_KEY_DERIVATION_INPUT_SECRET, - NULL, 0 ); - } - else - { - status = psa_key_derivation_input_key( - derivation, PSA_KEY_DERIVATION_INPUT_SECRET, - slot ); - } - if( status != PSA_SUCCESS ) - return( status ); - - status = psa_key_derivation_input_bytes( derivation, - PSA_KEY_DERIVATION_INPUT_LABEL, - label, label_length ); - if( status != PSA_SUCCESS ) - return( status ); - } - else - { - return( PSA_ERROR_NOT_SUPPORTED ); - } - - status = psa_key_derivation_set_capacity( derivation, capacity ); - if( status != PSA_SUCCESS ) - return( status ); - - return( PSA_SUCCESS ); -} - -static int tls_prf_generic( mbedtls_md_type_t md_type, - const unsigned char *secret, size_t slen, - const char *label, - const unsigned char *random, size_t rlen, - unsigned char *dstbuf, size_t dlen ) -{ - psa_status_t status; - psa_algorithm_t alg; - psa_key_handle_t master_slot = 0; - psa_key_derivation_operation_t derivation = - PSA_KEY_DERIVATION_OPERATION_INIT; - - if( md_type == MBEDTLS_MD_SHA384 ) - alg = PSA_ALG_TLS12_PRF(PSA_ALG_SHA_384); - else - alg = PSA_ALG_TLS12_PRF(PSA_ALG_SHA_256); - - /* Normally a "secret" should be long enough to be impossible to - * find by brute force, and in particular should not be empty. But - * this PRF is also used to derive an IV, in particular in EAP-TLS, - * and for this use case it makes sense to have a 0-length "secret". - * Since the key API doesn't allow importing a key of length 0, - * keep master_slot=0, which setup_psa_key_derivation() understands - * to mean a 0-length "secret" input. */ - if( slen != 0 ) - { - psa_key_attributes_t key_attributes = psa_key_attributes_init(); - psa_set_key_usage_flags( &key_attributes, PSA_KEY_USAGE_DERIVE ); - psa_set_key_algorithm( &key_attributes, alg ); - psa_set_key_type( &key_attributes, PSA_KEY_TYPE_DERIVE ); - - status = psa_import_key( &key_attributes, secret, slen, &master_slot ); - if( status != PSA_SUCCESS ) - return( MBEDTLS_ERR_SSL_HW_ACCEL_FAILED ); - } - - status = setup_psa_key_derivation( &derivation, - master_slot, alg, - random, rlen, - (unsigned char const *) label, - (size_t) strlen( label ), - dlen ); - if( status != PSA_SUCCESS ) - { - psa_key_derivation_abort( &derivation ); - psa_destroy_key( master_slot ); - return( MBEDTLS_ERR_SSL_HW_ACCEL_FAILED ); - } - - status = psa_key_derivation_output_bytes( &derivation, dstbuf, dlen ); - if( status != PSA_SUCCESS ) - { - psa_key_derivation_abort( &derivation ); - psa_destroy_key( master_slot ); - return( MBEDTLS_ERR_SSL_HW_ACCEL_FAILED ); - } - - status = psa_key_derivation_abort( &derivation ); - if( status != PSA_SUCCESS ) - { - psa_destroy_key( master_slot ); - return( MBEDTLS_ERR_SSL_HW_ACCEL_FAILED ); - } - - if( master_slot != 0 ) - status = psa_destroy_key( master_slot ); - if( status != PSA_SUCCESS ) - return( MBEDTLS_ERR_SSL_HW_ACCEL_FAILED ); - - return( 0 ); -} - -#else /* MBEDTLS_USE_PSA_CRYPTO */ - -static int tls_prf_generic( mbedtls_md_type_t md_type, - const unsigned char *secret, size_t slen, - const char *label, - const unsigned char *random, size_t rlen, - unsigned char *dstbuf, size_t dlen ) -{ - size_t nb; - size_t i, j, k, md_len; - unsigned char *tmp; - size_t tmp_len = 0; - unsigned char h_i[MBEDTLS_MD_MAX_SIZE]; - const mbedtls_md_info_t *md_info; - mbedtls_md_context_t md_ctx; - int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; - - mbedtls_md_init( &md_ctx ); - - if( ( md_info = mbedtls_md_info_from_type( md_type ) ) == NULL ) - return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); - - md_len = mbedtls_md_get_size( md_info ); - - tmp_len = md_len + strlen( label ) + rlen; - tmp = mbedtls_calloc( 1, tmp_len ); - if( tmp == NULL ) - { - ret = MBEDTLS_ERR_SSL_ALLOC_FAILED; - goto exit; - } - - nb = strlen( label ); - memcpy( tmp + md_len, label, nb ); - memcpy( tmp + md_len + nb, random, rlen ); - nb += rlen; - - /* - * Compute P_(secret, label + random)[0..dlen] - */ - if ( ( ret = mbedtls_md_setup( &md_ctx, md_info, 1 ) ) != 0 ) - goto exit; - - mbedtls_md_hmac_starts( &md_ctx, secret, slen ); - mbedtls_md_hmac_update( &md_ctx, tmp + md_len, nb ); - mbedtls_md_hmac_finish( &md_ctx, tmp ); - - for( i = 0; i < dlen; i += md_len ) - { - mbedtls_md_hmac_reset ( &md_ctx ); - mbedtls_md_hmac_update( &md_ctx, tmp, md_len + nb ); - mbedtls_md_hmac_finish( &md_ctx, h_i ); - - mbedtls_md_hmac_reset ( &md_ctx ); - mbedtls_md_hmac_update( &md_ctx, tmp, md_len ); - mbedtls_md_hmac_finish( &md_ctx, tmp ); - - k = ( i + md_len > dlen ) ? dlen % md_len : md_len; - - for( j = 0; j < k; j++ ) - dstbuf[i + j] = h_i[j]; - } - -exit: - mbedtls_md_free( &md_ctx ); - - mbedtls_platform_zeroize( tmp, tmp_len ); - mbedtls_platform_zeroize( h_i, sizeof( h_i ) ); - - mbedtls_free( tmp ); - - return( ret ); -} -#endif /* MBEDTLS_USE_PSA_CRYPTO */ -#if defined(MBEDTLS_SHA256_C) -static int tls_prf_sha256( const unsigned char *secret, size_t slen, - const char *label, - const unsigned char *random, size_t rlen, - unsigned char *dstbuf, size_t dlen ) -{ - return( tls_prf_generic( MBEDTLS_MD_SHA256, secret, slen, - label, random, rlen, dstbuf, dlen ) ); -} -#endif /* MBEDTLS_SHA256_C */ - -#if defined(MBEDTLS_SHA512_C) -static int tls_prf_sha384( const unsigned char *secret, size_t slen, - const char *label, - const unsigned char *random, size_t rlen, - unsigned char *dstbuf, size_t dlen ) -{ - return( tls_prf_generic( MBEDTLS_MD_SHA384, secret, slen, - label, random, rlen, dstbuf, dlen ) ); -} -#endif /* MBEDTLS_SHA512_C */ -#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */ - -static void ssl_update_checksum_start( mbedtls_ssl_context *, const unsigned char *, size_t ); - -#if defined(MBEDTLS_SSL_PROTO_SSL3) || defined(MBEDTLS_SSL_PROTO_TLS1) || \ - defined(MBEDTLS_SSL_PROTO_TLS1_1) -static void ssl_update_checksum_md5sha1( mbedtls_ssl_context *, const unsigned char *, size_t ); -#endif - -#if defined(MBEDTLS_SSL_PROTO_SSL3) -static void ssl_calc_verify_ssl( const mbedtls_ssl_context *, unsigned char *, size_t * ); -static void ssl_calc_finished_ssl( mbedtls_ssl_context *, unsigned char *, int ); -#endif - -#if defined(MBEDTLS_SSL_PROTO_TLS1) || defined(MBEDTLS_SSL_PROTO_TLS1_1) -static void ssl_calc_verify_tls( const mbedtls_ssl_context *, unsigned char *, size_t * ); -static void ssl_calc_finished_tls( mbedtls_ssl_context *, unsigned char *, int ); -#endif - -#if defined(MBEDTLS_SSL_PROTO_TLS1_2) -#if defined(MBEDTLS_SHA256_C) -static void ssl_update_checksum_sha256( mbedtls_ssl_context *, const unsigned char *, size_t ); -static void ssl_calc_verify_tls_sha256( const mbedtls_ssl_context *,unsigned char *, size_t * ); -static void ssl_calc_finished_tls_sha256( mbedtls_ssl_context *,unsigned char *, int ); -#endif - -#if defined(MBEDTLS_SHA512_C) -static void ssl_update_checksum_sha384( mbedtls_ssl_context *, const unsigned char *, size_t ); -static void ssl_calc_verify_tls_sha384( const mbedtls_ssl_context *, unsigned char *, size_t * ); -static void ssl_calc_finished_tls_sha384( mbedtls_ssl_context *, unsigned char *, int ); -#endif -#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */ - -#if defined(MBEDTLS_KEY_EXCHANGE_PSK_ENABLED) && \ - defined(MBEDTLS_USE_PSA_CRYPTO) -static int ssl_use_opaque_psk( mbedtls_ssl_context const *ssl ) -{ - if( ssl->conf->f_psk != NULL ) - { - /* If we've used a callback to select the PSK, - * the static configuration is irrelevant. */ - if( ssl->handshake->psk_opaque != 0 ) - return( 1 ); - - return( 0 ); - } - - if( ssl->conf->psk_opaque != 0 ) - return( 1 ); - - return( 0 ); -} -#endif /* MBEDTLS_USE_PSA_CRYPTO && - MBEDTLS_KEY_EXCHANGE_PSK_ENABLED */ - -#if defined(MBEDTLS_SSL_EXPORT_KEYS) -static mbedtls_tls_prf_types tls_prf_get_type( mbedtls_ssl_tls_prf_cb *tls_prf ) -{ -#if defined(MBEDTLS_SSL_PROTO_SSL3) - if( tls_prf == ssl3_prf ) - { - return( MBEDTLS_SSL_TLS_PRF_SSL3 ); - } - else -#endif -#if defined(MBEDTLS_SSL_PROTO_TLS1) || defined(MBEDTLS_SSL_PROTO_TLS1_1) - if( tls_prf == tls1_prf ) - { - return( MBEDTLS_SSL_TLS_PRF_TLS1 ); - } - else -#endif -#if defined(MBEDTLS_SSL_PROTO_TLS1_2) -#if defined(MBEDTLS_SHA512_C) - if( tls_prf == tls_prf_sha384 ) - { - return( MBEDTLS_SSL_TLS_PRF_SHA384 ); - } - else -#endif -#if defined(MBEDTLS_SHA256_C) - if( tls_prf == tls_prf_sha256 ) - { - return( MBEDTLS_SSL_TLS_PRF_SHA256 ); - } - else -#endif -#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */ - return( MBEDTLS_SSL_TLS_PRF_NONE ); -} -#endif /* MBEDTLS_SSL_EXPORT_KEYS */ - -int mbedtls_ssl_tls_prf( const mbedtls_tls_prf_types prf, - const unsigned char *secret, size_t slen, - const char *label, - const unsigned char *random, size_t rlen, - unsigned char *dstbuf, size_t dlen ) -{ - mbedtls_ssl_tls_prf_cb *tls_prf = NULL; - - switch( prf ) - { -#if defined(MBEDTLS_SSL_PROTO_SSL3) - case MBEDTLS_SSL_TLS_PRF_SSL3: - tls_prf = ssl3_prf; - break; -#endif /* MBEDTLS_SSL_PROTO_SSL3 */ -#if defined(MBEDTLS_SSL_PROTO_TLS1) || defined(MBEDTLS_SSL_PROTO_TLS1_1) - case MBEDTLS_SSL_TLS_PRF_TLS1: - tls_prf = tls1_prf; - break; -#endif /* MBEDTLS_SSL_PROTO_TLS1 || MBEDTLS_SSL_PROTO_TLS1_1 */ - -#if defined(MBEDTLS_SSL_PROTO_TLS1_2) -#if defined(MBEDTLS_SHA512_C) - case MBEDTLS_SSL_TLS_PRF_SHA384: - tls_prf = tls_prf_sha384; - break; -#endif /* MBEDTLS_SHA512_C */ -#if defined(MBEDTLS_SHA256_C) - case MBEDTLS_SSL_TLS_PRF_SHA256: - tls_prf = tls_prf_sha256; - break; -#endif /* MBEDTLS_SHA256_C */ -#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */ - default: - return( MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE ); - } - - return( tls_prf( secret, slen, label, random, rlen, dstbuf, dlen ) ); -} - -/* Type for the TLS PRF */ -typedef int ssl_tls_prf_t(const unsigned char *, size_t, const char *, - const unsigned char *, size_t, - unsigned char *, size_t); - -/* - * Populate a transform structure with session keys and all the other - * necessary information. - * - * Parameters: - * - [in/out]: transform: structure to populate - * [in] must be just initialised with mbedtls_ssl_transform_init() - * [out] fully populated, ready for use by mbedtls_ssl_{en,de}crypt_buf() - * - [in] ciphersuite - * - [in] master - * - [in] encrypt_then_mac - * - [in] trunc_hmac - * - [in] compression - * - [in] tls_prf: pointer to PRF to use for key derivation - * - [in] randbytes: buffer holding ServerHello.random + ClientHello.random - * - [in] minor_ver: SSL/TLS minor version - * - [in] endpoint: client or server - * - [in] ssl: optionally used for: - * - MBEDTLS_SSL_HW_RECORD_ACCEL: whole context - * - MBEDTLS_SSL_EXPORT_KEYS: ssl->conf->{f,p}_export_keys - * - MBEDTLS_DEBUG_C: ssl->conf->{f,p}_dbg - */ -static int ssl_populate_transform( mbedtls_ssl_transform *transform, - int ciphersuite, - const unsigned char master[48], -#if defined(MBEDTLS_SSL_SOME_MODES_USE_MAC) -#if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC) - int encrypt_then_mac, -#endif /* MBEDTLS_SSL_ENCRYPT_THEN_MAC */ -#if defined(MBEDTLS_SSL_TRUNCATED_HMAC) - int trunc_hmac, -#endif /* MBEDTLS_SSL_TRUNCATED_HMAC */ -#endif /* MBEDTLS_SSL_SOME_MODES_USE_MAC */ -#if defined(MBEDTLS_ZLIB_SUPPORT) - int compression, -#endif - ssl_tls_prf_t tls_prf, - const unsigned char randbytes[64], - int minor_ver, - unsigned endpoint, - const mbedtls_ssl_context *ssl ) -{ - int ret = 0; -#if defined(MBEDTLS_USE_PSA_CRYPTO) - int psa_fallthrough; -#endif /* MBEDTLS_USE_PSA_CRYPTO */ - unsigned char keyblk[256]; - unsigned char *key1; - unsigned char *key2; - unsigned char *mac_enc; - unsigned char *mac_dec; - size_t mac_key_len; - size_t iv_copy_len; - unsigned keylen; - const mbedtls_ssl_ciphersuite_t *ciphersuite_info; - const mbedtls_cipher_info_t *cipher_info; - const mbedtls_md_info_t *md_info; - -#if !defined(MBEDTLS_SSL_HW_RECORD_ACCEL) && \ - !defined(MBEDTLS_SSL_EXPORT_KEYS) && \ - !defined(MBEDTLS_DEBUG_C) - ssl = NULL; /* make sure we don't use it except for those cases */ - (void) ssl; -#endif - - /* - * Some data just needs copying into the structure - */ -#if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC) && \ - defined(MBEDTLS_SSL_SOME_MODES_USE_MAC) - transform->encrypt_then_mac = encrypt_then_mac; -#endif - transform->minor_ver = minor_ver; - -#if defined(MBEDTLS_SSL_CONTEXT_SERIALIZATION) - memcpy( transform->randbytes, randbytes, sizeof( transform->randbytes ) ); -#endif - - /* - * Get various info structures - */ - ciphersuite_info = mbedtls_ssl_ciphersuite_from_id( ciphersuite ); - if( ciphersuite_info == NULL ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "ciphersuite info for %d not found", - ciphersuite ) ); - return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); - } - - cipher_info = mbedtls_cipher_info_from_type( ciphersuite_info->cipher ); - if( cipher_info == NULL ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "cipher info for %d not found", - ciphersuite_info->cipher ) ); - return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); - } - - md_info = mbedtls_md_info_from_type( ciphersuite_info->mac ); - if( md_info == NULL ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "mbedtls_md info for %d not found", - ciphersuite_info->mac ) ); - return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); - } - -#if defined(MBEDTLS_SSL_DTLS_CONNECTION_ID) - /* Copy own and peer's CID if the use of the CID - * extension has been negotiated. */ - if( ssl->handshake->cid_in_use == MBEDTLS_SSL_CID_ENABLED ) - { - MBEDTLS_SSL_DEBUG_MSG( 3, ( "Copy CIDs into SSL transform" ) ); - - transform->in_cid_len = ssl->own_cid_len; - memcpy( transform->in_cid, ssl->own_cid, ssl->own_cid_len ); - MBEDTLS_SSL_DEBUG_BUF( 3, "Incoming CID", transform->in_cid, - transform->in_cid_len ); - - transform->out_cid_len = ssl->handshake->peer_cid_len; - memcpy( transform->out_cid, ssl->handshake->peer_cid, - ssl->handshake->peer_cid_len ); - MBEDTLS_SSL_DEBUG_BUF( 3, "Outgoing CID", transform->out_cid, - transform->out_cid_len ); - } -#endif /* MBEDTLS_SSL_DTLS_CONNECTION_ID */ - - /* - * Compute key block using the PRF - */ - ret = tls_prf( master, 48, "key expansion", randbytes, 64, keyblk, 256 ); - if( ret != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "prf", ret ); - return( ret ); - } - - MBEDTLS_SSL_DEBUG_MSG( 3, ( "ciphersuite = %s", - mbedtls_ssl_get_ciphersuite_name( ciphersuite ) ) ); - MBEDTLS_SSL_DEBUG_BUF( 3, "master secret", master, 48 ); - MBEDTLS_SSL_DEBUG_BUF( 4, "random bytes", randbytes, 64 ); - MBEDTLS_SSL_DEBUG_BUF( 4, "key block", keyblk, 256 ); - - /* - * Determine the appropriate key, IV and MAC length. - */ - - keylen = cipher_info->key_bitlen / 8; - -#if defined(MBEDTLS_GCM_C) || \ - defined(MBEDTLS_CCM_C) || \ - defined(MBEDTLS_CHACHAPOLY_C) - if( cipher_info->mode == MBEDTLS_MODE_GCM || - cipher_info->mode == MBEDTLS_MODE_CCM || - cipher_info->mode == MBEDTLS_MODE_CHACHAPOLY ) - { - size_t explicit_ivlen; - - transform->maclen = 0; - mac_key_len = 0; - transform->taglen = - ciphersuite_info->flags & MBEDTLS_CIPHERSUITE_SHORT_TAG ? 8 : 16; - - /* All modes haves 96-bit IVs; - * GCM and CCM has 4 implicit and 8 explicit bytes - * ChachaPoly has all 12 bytes implicit - */ - transform->ivlen = 12; - if( cipher_info->mode == MBEDTLS_MODE_CHACHAPOLY ) - transform->fixed_ivlen = 12; - else - transform->fixed_ivlen = 4; - - /* Minimum length of encrypted record */ - explicit_ivlen = transform->ivlen - transform->fixed_ivlen; - transform->minlen = explicit_ivlen + transform->taglen; - } - else -#endif /* MBEDTLS_GCM_C || MBEDTLS_CCM_C || MBEDTLS_CHACHAPOLY_C */ -#if defined(MBEDTLS_SSL_SOME_MODES_USE_MAC) - if( cipher_info->mode == MBEDTLS_MODE_STREAM || - cipher_info->mode == MBEDTLS_MODE_CBC ) - { - /* Initialize HMAC contexts */ - if( ( ret = mbedtls_md_setup( &transform->md_ctx_enc, md_info, 1 ) ) != 0 || - ( ret = mbedtls_md_setup( &transform->md_ctx_dec, md_info, 1 ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_md_setup", ret ); - goto end; - } - - /* Get MAC length */ - mac_key_len = mbedtls_md_get_size( md_info ); - transform->maclen = mac_key_len; - -#if defined(MBEDTLS_SSL_TRUNCATED_HMAC) - /* - * If HMAC is to be truncated, we shall keep the leftmost bytes, - * (rfc 6066 page 13 or rfc 2104 section 4), - * so we only need to adjust the length here. - */ - if( trunc_hmac == MBEDTLS_SSL_TRUNC_HMAC_ENABLED ) - { - transform->maclen = MBEDTLS_SSL_TRUNCATED_HMAC_LEN; - -#if defined(MBEDTLS_SSL_TRUNCATED_HMAC_COMPAT) - /* Fall back to old, non-compliant version of the truncated - * HMAC implementation which also truncates the key - * (Mbed TLS versions from 1.3 to 2.6.0) */ - mac_key_len = transform->maclen; -#endif - } -#endif /* MBEDTLS_SSL_TRUNCATED_HMAC */ - - /* IV length */ - transform->ivlen = cipher_info->iv_size; - - /* Minimum length */ - if( cipher_info->mode == MBEDTLS_MODE_STREAM ) - transform->minlen = transform->maclen; - else - { - /* - * GenericBlockCipher: - * 1. if EtM is in use: one block plus MAC - * otherwise: * first multiple of blocklen greater than maclen - * 2. IV except for SSL3 and TLS 1.0 - */ -#if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC) - if( encrypt_then_mac == MBEDTLS_SSL_ETM_ENABLED ) - { - transform->minlen = transform->maclen - + cipher_info->block_size; - } - else -#endif - { - transform->minlen = transform->maclen - + cipher_info->block_size - - transform->maclen % cipher_info->block_size; - } - -#if defined(MBEDTLS_SSL_PROTO_SSL3) || defined(MBEDTLS_SSL_PROTO_TLS1) - if( minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 || - minor_ver == MBEDTLS_SSL_MINOR_VERSION_1 ) - ; /* No need to adjust minlen */ - else -#endif -#if defined(MBEDTLS_SSL_PROTO_TLS1_1) || defined(MBEDTLS_SSL_PROTO_TLS1_2) - if( minor_ver == MBEDTLS_SSL_MINOR_VERSION_2 || - minor_ver == MBEDTLS_SSL_MINOR_VERSION_3 ) - { - transform->minlen += transform->ivlen; - } - else -#endif - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) ); - ret = MBEDTLS_ERR_SSL_INTERNAL_ERROR; - goto end; - } - } - } - else -#endif /* MBEDTLS_SSL_SOME_MODES_USE_MAC */ - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) ); - return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); - } - - MBEDTLS_SSL_DEBUG_MSG( 3, ( "keylen: %u, minlen: %u, ivlen: %u, maclen: %u", - (unsigned) keylen, - (unsigned) transform->minlen, - (unsigned) transform->ivlen, - (unsigned) transform->maclen ) ); - - /* - * Finally setup the cipher contexts, IVs and MAC secrets. - */ -#if defined(MBEDTLS_SSL_CLI_C) - if( endpoint == MBEDTLS_SSL_IS_CLIENT ) - { - key1 = keyblk + mac_key_len * 2; - key2 = keyblk + mac_key_len * 2 + keylen; - - mac_enc = keyblk; - mac_dec = keyblk + mac_key_len; - - /* - * This is not used in TLS v1.1. - */ - iv_copy_len = ( transform->fixed_ivlen ) ? - transform->fixed_ivlen : transform->ivlen; - memcpy( transform->iv_enc, key2 + keylen, iv_copy_len ); - memcpy( transform->iv_dec, key2 + keylen + iv_copy_len, - iv_copy_len ); - } - else -#endif /* MBEDTLS_SSL_CLI_C */ -#if defined(MBEDTLS_SSL_SRV_C) - if( endpoint == MBEDTLS_SSL_IS_SERVER ) - { - key1 = keyblk + mac_key_len * 2 + keylen; - key2 = keyblk + mac_key_len * 2; - - mac_enc = keyblk + mac_key_len; - mac_dec = keyblk; - - /* - * This is not used in TLS v1.1. - */ - iv_copy_len = ( transform->fixed_ivlen ) ? - transform->fixed_ivlen : transform->ivlen; - memcpy( transform->iv_dec, key1 + keylen, iv_copy_len ); - memcpy( transform->iv_enc, key1 + keylen + iv_copy_len, - iv_copy_len ); - } - else -#endif /* MBEDTLS_SSL_SRV_C */ - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) ); - ret = MBEDTLS_ERR_SSL_INTERNAL_ERROR; - goto end; - } - -#if defined(MBEDTLS_SSL_SOME_MODES_USE_MAC) -#if defined(MBEDTLS_SSL_PROTO_SSL3) - if( minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 ) - { - if( mac_key_len > sizeof( transform->mac_enc ) ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) ); - ret = MBEDTLS_ERR_SSL_INTERNAL_ERROR; - goto end; - } - - memcpy( transform->mac_enc, mac_enc, mac_key_len ); - memcpy( transform->mac_dec, mac_dec, mac_key_len ); - } - else -#endif /* MBEDTLS_SSL_PROTO_SSL3 */ -#if defined(MBEDTLS_SSL_PROTO_TLS1) || defined(MBEDTLS_SSL_PROTO_TLS1_1) || \ - defined(MBEDTLS_SSL_PROTO_TLS1_2) - if( minor_ver >= MBEDTLS_SSL_MINOR_VERSION_1 ) - { - /* For HMAC-based ciphersuites, initialize the HMAC transforms. - For AEAD-based ciphersuites, there is nothing to do here. */ - if( mac_key_len != 0 ) - { - mbedtls_md_hmac_starts( &transform->md_ctx_enc, mac_enc, mac_key_len ); - mbedtls_md_hmac_starts( &transform->md_ctx_dec, mac_dec, mac_key_len ); - } - } - else -#endif - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) ); - ret = MBEDTLS_ERR_SSL_INTERNAL_ERROR; - goto end; - } -#endif /* MBEDTLS_SSL_SOME_MODES_USE_MAC */ - -#if defined(MBEDTLS_SSL_HW_RECORD_ACCEL) - if( mbedtls_ssl_hw_record_init != NULL ) - { - int ret = 0; - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "going for mbedtls_ssl_hw_record_init()" ) ); - - if( ( ret = mbedtls_ssl_hw_record_init( ssl, key1, key2, keylen, - transform->iv_enc, transform->iv_dec, - iv_copy_len, - mac_enc, mac_dec, - mac_key_len ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_hw_record_init", ret ); - ret = MBEDTLS_ERR_SSL_HW_ACCEL_FAILED; - goto end; - } - } -#else - ((void) mac_dec); - ((void) mac_enc); -#endif /* MBEDTLS_SSL_HW_RECORD_ACCEL */ - -#if defined(MBEDTLS_SSL_EXPORT_KEYS) - if( ssl->conf->f_export_keys != NULL ) - { - ssl->conf->f_export_keys( ssl->conf->p_export_keys, - master, keyblk, - mac_key_len, keylen, - iv_copy_len ); - } - - if( ssl->conf->f_export_keys_ext != NULL ) - { - ssl->conf->f_export_keys_ext( ssl->conf->p_export_keys, - master, keyblk, - mac_key_len, keylen, - iv_copy_len, - randbytes + 32, - randbytes, - tls_prf_get_type( tls_prf ) ); - } -#endif - -#if defined(MBEDTLS_USE_PSA_CRYPTO) - - /* Only use PSA-based ciphers for TLS-1.2. - * That's relevant at least for TLS-1.0, where - * we assume that mbedtls_cipher_crypt() updates - * the structure field for the IV, which the PSA-based - * implementation currently doesn't. */ -#if defined(MBEDTLS_SSL_PROTO_TLS1_2) - if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_3 ) - { - ret = mbedtls_cipher_setup_psa( &transform->cipher_ctx_enc, - cipher_info, transform->taglen ); - if( ret != 0 && ret != MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_cipher_setup_psa", ret ); - goto end; - } - - if( ret == 0 ) - { - MBEDTLS_SSL_DEBUG_MSG( 3, ( "Successfully setup PSA-based encryption cipher context" ) ); - psa_fallthrough = 0; - } - else - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "Failed to setup PSA-based cipher context for record encryption - fall through to default setup." ) ); - psa_fallthrough = 1; - } - } - else - psa_fallthrough = 1; -#else - psa_fallthrough = 1; -#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */ - - if( psa_fallthrough == 1 ) -#endif /* MBEDTLS_USE_PSA_CRYPTO */ - if( ( ret = mbedtls_cipher_setup( &transform->cipher_ctx_enc, - cipher_info ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_cipher_setup", ret ); - goto end; - } - -#if defined(MBEDTLS_USE_PSA_CRYPTO) - /* Only use PSA-based ciphers for TLS-1.2. - * That's relevant at least for TLS-1.0, where - * we assume that mbedtls_cipher_crypt() updates - * the structure field for the IV, which the PSA-based - * implementation currently doesn't. */ -#if defined(MBEDTLS_SSL_PROTO_TLS1_2) - if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_3 ) - { - ret = mbedtls_cipher_setup_psa( &transform->cipher_ctx_dec, - cipher_info, transform->taglen ); - if( ret != 0 && ret != MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_cipher_setup_psa", ret ); - goto end; - } - - if( ret == 0 ) - { - MBEDTLS_SSL_DEBUG_MSG( 3, ( "Successfully setup PSA-based decryption cipher context" ) ); - psa_fallthrough = 0; - } - else - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "Failed to setup PSA-based cipher context for record decryption - fall through to default setup." ) ); - psa_fallthrough = 1; - } - } - else - psa_fallthrough = 1; -#else - psa_fallthrough = 1; -#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */ - - if( psa_fallthrough == 1 ) -#endif /* MBEDTLS_USE_PSA_CRYPTO */ - if( ( ret = mbedtls_cipher_setup( &transform->cipher_ctx_dec, - cipher_info ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_cipher_setup", ret ); - goto end; - } - - if( ( ret = mbedtls_cipher_setkey( &transform->cipher_ctx_enc, key1, - cipher_info->key_bitlen, - MBEDTLS_ENCRYPT ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_cipher_setkey", ret ); - goto end; - } - - if( ( ret = mbedtls_cipher_setkey( &transform->cipher_ctx_dec, key2, - cipher_info->key_bitlen, - MBEDTLS_DECRYPT ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_cipher_setkey", ret ); - goto end; - } - -#if defined(MBEDTLS_CIPHER_MODE_CBC) - if( cipher_info->mode == MBEDTLS_MODE_CBC ) - { - if( ( ret = mbedtls_cipher_set_padding_mode( &transform->cipher_ctx_enc, - MBEDTLS_PADDING_NONE ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_cipher_set_padding_mode", ret ); - goto end; - } - - if( ( ret = mbedtls_cipher_set_padding_mode( &transform->cipher_ctx_dec, - MBEDTLS_PADDING_NONE ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_cipher_set_padding_mode", ret ); - goto end; - } - } -#endif /* MBEDTLS_CIPHER_MODE_CBC */ - - - /* Initialize Zlib contexts */ -#if defined(MBEDTLS_ZLIB_SUPPORT) - if( compression == MBEDTLS_SSL_COMPRESS_DEFLATE ) - { - MBEDTLS_SSL_DEBUG_MSG( 3, ( "Initializing zlib states" ) ); - - memset( &transform->ctx_deflate, 0, sizeof( transform->ctx_deflate ) ); - memset( &transform->ctx_inflate, 0, sizeof( transform->ctx_inflate ) ); - - if( deflateInit( &transform->ctx_deflate, - Z_DEFAULT_COMPRESSION ) != Z_OK || - inflateInit( &transform->ctx_inflate ) != Z_OK ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "Failed to initialize compression" ) ); - ret = MBEDTLS_ERR_SSL_COMPRESSION_FAILED; - goto end; - } - } -#endif /* MBEDTLS_ZLIB_SUPPORT */ - -end: - mbedtls_platform_zeroize( keyblk, sizeof( keyblk ) ); - return( ret ); -} - -/* - * Set appropriate PRF function and other SSL / TLS 1.0/1.1 / TLS1.2 functions - * - * Inputs: - * - SSL/TLS minor version - * - hash associated with the ciphersuite (only used by TLS 1.2) - * - * Outputs: - * - the tls_prf, calc_verify and calc_finished members of handshake structure - */ -static int ssl_set_handshake_prfs( mbedtls_ssl_handshake_params *handshake, - int minor_ver, - mbedtls_md_type_t hash ) -{ -#if !defined(MBEDTLS_SSL_PROTO_TLS1_2) || !defined(MBEDTLS_SHA512_C) - (void) hash; -#endif - -#if defined(MBEDTLS_SSL_PROTO_SSL3) - if( minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 ) - { - handshake->tls_prf = ssl3_prf; - handshake->calc_verify = ssl_calc_verify_ssl; - handshake->calc_finished = ssl_calc_finished_ssl; - } - else -#endif -#if defined(MBEDTLS_SSL_PROTO_TLS1) || defined(MBEDTLS_SSL_PROTO_TLS1_1) - if( minor_ver < MBEDTLS_SSL_MINOR_VERSION_3 ) - { - handshake->tls_prf = tls1_prf; - handshake->calc_verify = ssl_calc_verify_tls; - handshake->calc_finished = ssl_calc_finished_tls; - } - else -#endif -#if defined(MBEDTLS_SSL_PROTO_TLS1_2) -#if defined(MBEDTLS_SHA512_C) - if( minor_ver == MBEDTLS_SSL_MINOR_VERSION_3 && - hash == MBEDTLS_MD_SHA384 ) - { - handshake->tls_prf = tls_prf_sha384; - handshake->calc_verify = ssl_calc_verify_tls_sha384; - handshake->calc_finished = ssl_calc_finished_tls_sha384; - } - else -#endif -#if defined(MBEDTLS_SHA256_C) - if( minor_ver == MBEDTLS_SSL_MINOR_VERSION_3 ) - { - handshake->tls_prf = tls_prf_sha256; - handshake->calc_verify = ssl_calc_verify_tls_sha256; - handshake->calc_finished = ssl_calc_finished_tls_sha256; - } - else -#endif -#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */ - { - return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); - } - - return( 0 ); -} - -/* - * Compute master secret if needed - * - * Parameters: - * [in/out] handshake - * [in] resume, premaster, extended_ms, calc_verify, tls_prf - * (PSA-PSK) ciphersuite_info, psk_opaque - * [out] premaster (cleared) - * [out] master - * [in] ssl: optionally used for debugging, EMS and PSA-PSK - * debug: conf->f_dbg, conf->p_dbg - * EMS: passed to calc_verify (debug + (SSL3) session_negotiate) - * PSA-PSA: minor_ver, conf - */ -static int ssl_compute_master( mbedtls_ssl_handshake_params *handshake, - unsigned char *master, - const mbedtls_ssl_context *ssl ) -{ - int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; - - /* cf. RFC 5246, Section 8.1: - * "The master secret is always exactly 48 bytes in length." */ - size_t const master_secret_len = 48; - -#if defined(MBEDTLS_SSL_EXTENDED_MASTER_SECRET) - unsigned char session_hash[48]; -#endif /* MBEDTLS_SSL_EXTENDED_MASTER_SECRET */ - - /* The label for the KDF used for key expansion. - * This is either "master secret" or "extended master secret" - * depending on whether the Extended Master Secret extension - * is used. */ - char const *lbl = "master secret"; - - /* The salt for the KDF used for key expansion. - * - If the Extended Master Secret extension is not used, - * this is ClientHello.Random + ServerHello.Random - * (see Sect. 8.1 in RFC 5246). - * - If the Extended Master Secret extension is used, - * this is the transcript of the handshake so far. - * (see Sect. 4 in RFC 7627). */ - unsigned char const *salt = handshake->randbytes; - size_t salt_len = 64; - -#if !defined(MBEDTLS_DEBUG_C) && \ - !defined(MBEDTLS_SSL_EXTENDED_MASTER_SECRET) && \ - !(defined(MBEDTLS_USE_PSA_CRYPTO) && \ - defined(MBEDTLS_KEY_EXCHANGE_PSK_ENABLED)) - ssl = NULL; /* make sure we don't use it except for those cases */ - (void) ssl; -#endif - - if( handshake->resume != 0 ) - { - MBEDTLS_SSL_DEBUG_MSG( 3, ( "no premaster (session resumed)" ) ); - return( 0 ); - } - -#if defined(MBEDTLS_SSL_EXTENDED_MASTER_SECRET) - if( handshake->extended_ms == MBEDTLS_SSL_EXTENDED_MS_ENABLED ) - { - lbl = "extended master secret"; - salt = session_hash; - handshake->calc_verify( ssl, session_hash, &salt_len ); - - MBEDTLS_SSL_DEBUG_BUF( 3, "session hash for extended master secret", - session_hash, salt_len ); - } -#endif /* MBEDTLS_SSL_EXTENDED_MS_ENABLED */ - -#if defined(MBEDTLS_USE_PSA_CRYPTO) && \ - defined(MBEDTLS_KEY_EXCHANGE_PSK_ENABLED) - if( handshake->ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_PSK && - ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_3 && - ssl_use_opaque_psk( ssl ) == 1 ) - { - /* Perform PSK-to-MS expansion in a single step. */ - psa_status_t status; - psa_algorithm_t alg; - psa_key_handle_t psk; - psa_key_derivation_operation_t derivation = - PSA_KEY_DERIVATION_OPERATION_INIT; - mbedtls_md_type_t hash_alg = handshake->ciphersuite_info->mac; - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "perform PSA-based PSK-to-MS expansion" ) ); - - psk = ssl->conf->psk_opaque; - if( handshake->psk_opaque != 0 ) - psk = handshake->psk_opaque; - - if( hash_alg == MBEDTLS_MD_SHA384 ) - alg = PSA_ALG_TLS12_PSK_TO_MS(PSA_ALG_SHA_384); - else - alg = PSA_ALG_TLS12_PSK_TO_MS(PSA_ALG_SHA_256); - - status = setup_psa_key_derivation( &derivation, psk, alg, - salt, salt_len, - (unsigned char const *) lbl, - (size_t) strlen( lbl ), - master_secret_len ); - if( status != PSA_SUCCESS ) - { - psa_key_derivation_abort( &derivation ); - return( MBEDTLS_ERR_SSL_HW_ACCEL_FAILED ); - } - - status = psa_key_derivation_output_bytes( &derivation, - master, - master_secret_len ); - if( status != PSA_SUCCESS ) - { - psa_key_derivation_abort( &derivation ); - return( MBEDTLS_ERR_SSL_HW_ACCEL_FAILED ); - } - - status = psa_key_derivation_abort( &derivation ); - if( status != PSA_SUCCESS ) - return( MBEDTLS_ERR_SSL_HW_ACCEL_FAILED ); - } - else -#endif - { - ret = handshake->tls_prf( handshake->premaster, handshake->pmslen, - lbl, salt, salt_len, - master, - master_secret_len ); - if( ret != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "prf", ret ); - return( ret ); - } - - MBEDTLS_SSL_DEBUG_BUF( 3, "premaster secret", - handshake->premaster, - handshake->pmslen ); - - mbedtls_platform_zeroize( handshake->premaster, - sizeof(handshake->premaster) ); - } - - return( 0 ); -} - -int mbedtls_ssl_derive_keys( mbedtls_ssl_context *ssl ) -{ - int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; - const mbedtls_ssl_ciphersuite_t * const ciphersuite_info = - ssl->handshake->ciphersuite_info; - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> derive keys" ) ); - - /* Set PRF, calc_verify and calc_finished function pointers */ - ret = ssl_set_handshake_prfs( ssl->handshake, - ssl->minor_ver, - ciphersuite_info->mac ); - if( ret != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "ssl_set_handshake_prfs", ret ); - return( ret ); - } - - /* Compute master secret if needed */ - ret = ssl_compute_master( ssl->handshake, - ssl->session_negotiate->master, - ssl ); - if( ret != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "ssl_compute_master", ret ); - return( ret ); - } - - /* Swap the client and server random values: - * - MS derivation wanted client+server (RFC 5246 8.1) - * - key derivation wants server+client (RFC 5246 6.3) */ - { - unsigned char tmp[64]; - memcpy( tmp, ssl->handshake->randbytes, 64 ); - memcpy( ssl->handshake->randbytes, tmp + 32, 32 ); - memcpy( ssl->handshake->randbytes + 32, tmp, 32 ); - mbedtls_platform_zeroize( tmp, sizeof( tmp ) ); - } - - /* Populate transform structure */ - ret = ssl_populate_transform( ssl->transform_negotiate, - ssl->session_negotiate->ciphersuite, - ssl->session_negotiate->master, -#if defined(MBEDTLS_SSL_SOME_MODES_USE_MAC) -#if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC) - ssl->session_negotiate->encrypt_then_mac, -#endif /* MBEDTLS_SSL_ENCRYPT_THEN_MAC */ -#if defined(MBEDTLS_SSL_TRUNCATED_HMAC) - ssl->session_negotiate->trunc_hmac, -#endif /* MBEDTLS_SSL_TRUNCATED_HMAC */ -#endif /* MBEDTLS_SSL_SOME_MODES_USE_MAC */ -#if defined(MBEDTLS_ZLIB_SUPPORT) - ssl->session_negotiate->compression, -#endif - ssl->handshake->tls_prf, - ssl->handshake->randbytes, - ssl->minor_ver, - ssl->conf->endpoint, - ssl ); - if( ret != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "ssl_populate_transform", ret ); - return( ret ); - } - - /* We no longer need Server/ClientHello.random values */ - mbedtls_platform_zeroize( ssl->handshake->randbytes, - sizeof( ssl->handshake->randbytes ) ); - - /* Allocate compression buffer */ -#if defined(MBEDTLS_ZLIB_SUPPORT) - if( ssl->session_negotiate->compression == MBEDTLS_SSL_COMPRESS_DEFLATE && - ssl->compress_buf == NULL ) - { - MBEDTLS_SSL_DEBUG_MSG( 3, ( "Allocating compression buffer" ) ); - ssl->compress_buf = mbedtls_calloc( 1, MBEDTLS_SSL_COMPRESS_BUFFER_LEN ); - if( ssl->compress_buf == NULL ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "alloc(%d bytes) failed", - MBEDTLS_SSL_COMPRESS_BUFFER_LEN ) ); - return( MBEDTLS_ERR_SSL_ALLOC_FAILED ); - } - } -#endif - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= derive keys" ) ); - - return( 0 ); -} - -#if defined(MBEDTLS_SSL_PROTO_SSL3) -void ssl_calc_verify_ssl( const mbedtls_ssl_context *ssl, - unsigned char hash[36], - size_t *hlen ) -{ - mbedtls_md5_context md5; - mbedtls_sha1_context sha1; - unsigned char pad_1[48]; - unsigned char pad_2[48]; - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> calc verify ssl" ) ); - - mbedtls_md5_init( &md5 ); - mbedtls_sha1_init( &sha1 ); - - mbedtls_md5_clone( &md5, &ssl->handshake->fin_md5 ); - mbedtls_sha1_clone( &sha1, &ssl->handshake->fin_sha1 ); - - memset( pad_1, 0x36, 48 ); - memset( pad_2, 0x5C, 48 ); - - mbedtls_md5_update_ret( &md5, ssl->session_negotiate->master, 48 ); - mbedtls_md5_update_ret( &md5, pad_1, 48 ); - mbedtls_md5_finish_ret( &md5, hash ); - - mbedtls_md5_starts_ret( &md5 ); - mbedtls_md5_update_ret( &md5, ssl->session_negotiate->master, 48 ); - mbedtls_md5_update_ret( &md5, pad_2, 48 ); - mbedtls_md5_update_ret( &md5, hash, 16 ); - mbedtls_md5_finish_ret( &md5, hash ); - - mbedtls_sha1_update_ret( &sha1, ssl->session_negotiate->master, 48 ); - mbedtls_sha1_update_ret( &sha1, pad_1, 40 ); - mbedtls_sha1_finish_ret( &sha1, hash + 16 ); - - mbedtls_sha1_starts_ret( &sha1 ); - mbedtls_sha1_update_ret( &sha1, ssl->session_negotiate->master, 48 ); - mbedtls_sha1_update_ret( &sha1, pad_2, 40 ); - mbedtls_sha1_update_ret( &sha1, hash + 16, 20 ); - mbedtls_sha1_finish_ret( &sha1, hash + 16 ); - - *hlen = 36; - - MBEDTLS_SSL_DEBUG_BUF( 3, "calculated verify result", hash, *hlen ); - MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= calc verify" ) ); - - mbedtls_md5_free( &md5 ); - mbedtls_sha1_free( &sha1 ); - - return; -} -#endif /* MBEDTLS_SSL_PROTO_SSL3 */ - -#if defined(MBEDTLS_SSL_PROTO_TLS1) || defined(MBEDTLS_SSL_PROTO_TLS1_1) -void ssl_calc_verify_tls( const mbedtls_ssl_context *ssl, - unsigned char hash[36], - size_t *hlen ) -{ - mbedtls_md5_context md5; - mbedtls_sha1_context sha1; - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> calc verify tls" ) ); - - mbedtls_md5_init( &md5 ); - mbedtls_sha1_init( &sha1 ); - - mbedtls_md5_clone( &md5, &ssl->handshake->fin_md5 ); - mbedtls_sha1_clone( &sha1, &ssl->handshake->fin_sha1 ); - - mbedtls_md5_finish_ret( &md5, hash ); - mbedtls_sha1_finish_ret( &sha1, hash + 16 ); - - *hlen = 36; - - MBEDTLS_SSL_DEBUG_BUF( 3, "calculated verify result", hash, *hlen ); - MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= calc verify" ) ); - - mbedtls_md5_free( &md5 ); - mbedtls_sha1_free( &sha1 ); - - return; -} -#endif /* MBEDTLS_SSL_PROTO_TLS1 || MBEDTLS_SSL_PROTO_TLS1_1 */ - -#if defined(MBEDTLS_SSL_PROTO_TLS1_2) -#if defined(MBEDTLS_SHA256_C) -void ssl_calc_verify_tls_sha256( const mbedtls_ssl_context *ssl, - unsigned char hash[32], - size_t *hlen ) -{ -#if defined(MBEDTLS_USE_PSA_CRYPTO) - size_t hash_size; - psa_status_t status; - psa_hash_operation_t sha256_psa = psa_hash_operation_init(); - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> PSA calc verify sha256" ) ); - status = psa_hash_clone( &ssl->handshake->fin_sha256_psa, &sha256_psa ); - if( status != PSA_SUCCESS ) - { - MBEDTLS_SSL_DEBUG_MSG( 2, ( "PSA hash clone failed" ) ); - return; - } - - status = psa_hash_finish( &sha256_psa, hash, 32, &hash_size ); - if( status != PSA_SUCCESS ) - { - MBEDTLS_SSL_DEBUG_MSG( 2, ( "PSA hash finish failed" ) ); - return; - } - - *hlen = 32; - MBEDTLS_SSL_DEBUG_BUF( 3, "PSA calculated verify result", hash, *hlen ); - MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= PSA calc verify" ) ); -#else - mbedtls_sha256_context sha256; - - mbedtls_sha256_init( &sha256 ); - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> calc verify sha256" ) ); - - mbedtls_sha256_clone( &sha256, &ssl->handshake->fin_sha256 ); - mbedtls_sha256_finish_ret( &sha256, hash ); - - *hlen = 32; - - MBEDTLS_SSL_DEBUG_BUF( 3, "calculated verify result", hash, *hlen ); - MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= calc verify" ) ); - - mbedtls_sha256_free( &sha256 ); -#endif /* MBEDTLS_USE_PSA_CRYPTO */ - return; -} -#endif /* MBEDTLS_SHA256_C */ - -#if defined(MBEDTLS_SHA512_C) -void ssl_calc_verify_tls_sha384( const mbedtls_ssl_context *ssl, - unsigned char hash[48], - size_t *hlen ) -{ -#if defined(MBEDTLS_USE_PSA_CRYPTO) - size_t hash_size; - psa_status_t status; - psa_hash_operation_t sha384_psa = psa_hash_operation_init(); - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> PSA calc verify sha384" ) ); - status = psa_hash_clone( &ssl->handshake->fin_sha384_psa, &sha384_psa ); - if( status != PSA_SUCCESS ) - { - MBEDTLS_SSL_DEBUG_MSG( 2, ( "PSA hash clone failed" ) ); - return; - } - - status = psa_hash_finish( &sha384_psa, hash, 48, &hash_size ); - if( status != PSA_SUCCESS ) - { - MBEDTLS_SSL_DEBUG_MSG( 2, ( "PSA hash finish failed" ) ); - return; - } - - *hlen = 48; - MBEDTLS_SSL_DEBUG_BUF( 3, "PSA calculated verify result", hash, *hlen ); - MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= PSA calc verify" ) ); -#else - mbedtls_sha512_context sha512; - - mbedtls_sha512_init( &sha512 ); - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> calc verify sha384" ) ); - - mbedtls_sha512_clone( &sha512, &ssl->handshake->fin_sha512 ); - mbedtls_sha512_finish_ret( &sha512, hash ); - - *hlen = 48; - - MBEDTLS_SSL_DEBUG_BUF( 3, "calculated verify result", hash, *hlen ); - MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= calc verify" ) ); - - mbedtls_sha512_free( &sha512 ); -#endif /* MBEDTLS_USE_PSA_CRYPTO */ - return; -} -#endif /* MBEDTLS_SHA512_C */ -#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */ - -#if defined(MBEDTLS_KEY_EXCHANGE__SOME__PSK_ENABLED) -int mbedtls_ssl_psk_derive_premaster( mbedtls_ssl_context *ssl, mbedtls_key_exchange_type_t key_ex ) -{ - unsigned char *p = ssl->handshake->premaster; - unsigned char *end = p + sizeof( ssl->handshake->premaster ); - const unsigned char *psk = ssl->conf->psk; - size_t psk_len = ssl->conf->psk_len; - - /* If the psk callback was called, use its result */ - if( ssl->handshake->psk != NULL ) - { - psk = ssl->handshake->psk; - psk_len = ssl->handshake->psk_len; - } - - /* - * PMS = struct { - * opaque other_secret<0..2^16-1>; - * opaque psk<0..2^16-1>; - * }; - * with "other_secret" depending on the particular key exchange - */ -#if defined(MBEDTLS_KEY_EXCHANGE_PSK_ENABLED) - if( key_ex == MBEDTLS_KEY_EXCHANGE_PSK ) - { - if( end - p < 2 ) - return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); - - *(p++) = (unsigned char)( psk_len >> 8 ); - *(p++) = (unsigned char)( psk_len ); - - if( end < p || (size_t)( end - p ) < psk_len ) - return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); - - memset( p, 0, psk_len ); - p += psk_len; - } - else -#endif /* MBEDTLS_KEY_EXCHANGE_PSK_ENABLED */ -#if defined(MBEDTLS_KEY_EXCHANGE_RSA_PSK_ENABLED) - if( key_ex == MBEDTLS_KEY_EXCHANGE_RSA_PSK ) - { - /* - * other_secret already set by the ClientKeyExchange message, - * and is 48 bytes long - */ - if( end - p < 2 ) - return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); - - *p++ = 0; - *p++ = 48; - p += 48; - } - else -#endif /* MBEDTLS_KEY_EXCHANGE_RSA_PSK_ENABLED */ -#if defined(MBEDTLS_KEY_EXCHANGE_DHE_PSK_ENABLED) - if( key_ex == MBEDTLS_KEY_EXCHANGE_DHE_PSK ) - { - int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; - size_t len; - - /* Write length only when we know the actual value */ - if( ( ret = mbedtls_dhm_calc_secret( &ssl->handshake->dhm_ctx, - p + 2, end - ( p + 2 ), &len, - ssl->conf->f_rng, ssl->conf->p_rng ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_dhm_calc_secret", ret ); - return( ret ); - } - *(p++) = (unsigned char)( len >> 8 ); - *(p++) = (unsigned char)( len ); - p += len; - - MBEDTLS_SSL_DEBUG_MPI( 3, "DHM: K ", &ssl->handshake->dhm_ctx.K ); - } - else -#endif /* MBEDTLS_KEY_EXCHANGE_DHE_PSK_ENABLED */ -#if defined(MBEDTLS_KEY_EXCHANGE_ECDHE_PSK_ENABLED) - if( key_ex == MBEDTLS_KEY_EXCHANGE_ECDHE_PSK ) - { - int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; - size_t zlen; - - if( ( ret = mbedtls_ecdh_calc_secret( &ssl->handshake->ecdh_ctx, &zlen, - p + 2, end - ( p + 2 ), - ssl->conf->f_rng, ssl->conf->p_rng ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ecdh_calc_secret", ret ); - return( ret ); - } - - *(p++) = (unsigned char)( zlen >> 8 ); - *(p++) = (unsigned char)( zlen ); - p += zlen; - - MBEDTLS_SSL_DEBUG_ECDH( 3, &ssl->handshake->ecdh_ctx, - MBEDTLS_DEBUG_ECDH_Z ); - } - else -#endif /* MBEDTLS_KEY_EXCHANGE_ECDHE_PSK_ENABLED */ - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) ); - return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); - } - - /* opaque psk<0..2^16-1>; */ - if( end - p < 2 ) - return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); - - *(p++) = (unsigned char)( psk_len >> 8 ); - *(p++) = (unsigned char)( psk_len ); - - if( end < p || (size_t)( end - p ) < psk_len ) - return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); - - memcpy( p, psk, psk_len ); - p += psk_len; - - ssl->handshake->pmslen = p - ssl->handshake->premaster; - - return( 0 ); -} -#endif /* MBEDTLS_KEY_EXCHANGE__SOME__PSK_ENABLED */ - -#if defined(MBEDTLS_SSL_PROTO_SSL3) -/* - * SSLv3.0 MAC functions - */ -#define SSL_MAC_MAX_BYTES 20 /* MD-5 or SHA-1 */ -static void ssl_mac( mbedtls_md_context_t *md_ctx, - const unsigned char *secret, - const unsigned char *buf, size_t len, - const unsigned char *ctr, int type, - unsigned char out[SSL_MAC_MAX_BYTES] ) -{ - unsigned char header[11]; - unsigned char padding[48]; - int padlen; - int md_size = mbedtls_md_get_size( md_ctx->md_info ); - int md_type = mbedtls_md_get_type( md_ctx->md_info ); - - /* Only MD5 and SHA-1 supported */ - if( md_type == MBEDTLS_MD_MD5 ) - padlen = 48; - else - padlen = 40; - - memcpy( header, ctr, 8 ); - header[ 8] = (unsigned char) type; - header[ 9] = (unsigned char)( len >> 8 ); - header[10] = (unsigned char)( len ); - - memset( padding, 0x36, padlen ); - mbedtls_md_starts( md_ctx ); - mbedtls_md_update( md_ctx, secret, md_size ); - mbedtls_md_update( md_ctx, padding, padlen ); - mbedtls_md_update( md_ctx, header, 11 ); - mbedtls_md_update( md_ctx, buf, len ); - mbedtls_md_finish( md_ctx, out ); - - memset( padding, 0x5C, padlen ); - mbedtls_md_starts( md_ctx ); - mbedtls_md_update( md_ctx, secret, md_size ); - mbedtls_md_update( md_ctx, padding, padlen ); - mbedtls_md_update( md_ctx, out, md_size ); - mbedtls_md_finish( md_ctx, out ); -} -#endif /* MBEDTLS_SSL_PROTO_SSL3 */ - -#if defined(MBEDTLS_SSL_SRV_C) && defined(MBEDTLS_SSL_RENEGOTIATION) -static int ssl_write_hello_request( mbedtls_ssl_context *ssl ); - -#if defined(MBEDTLS_SSL_PROTO_DTLS) -int mbedtls_ssl_resend_hello_request( mbedtls_ssl_context *ssl ) -{ - /* If renegotiation is not enforced, retransmit until we would reach max - * timeout if we were using the usual handshake doubling scheme */ - if( ssl->conf->renego_max_records < 0 ) - { - uint32_t ratio = ssl->conf->hs_timeout_max / ssl->conf->hs_timeout_min + 1; - unsigned char doublings = 1; - - while( ratio != 0 ) - { - ++doublings; - ratio >>= 1; - } - - if( ++ssl->renego_records_seen > doublings ) - { - MBEDTLS_SSL_DEBUG_MSG( 2, ( "no longer retransmitting hello request" ) ); - return( 0 ); - } - } - - return( ssl_write_hello_request( ssl ) ); -} -#endif -#endif /* MBEDTLS_SSL_SRV_C && MBEDTLS_SSL_RENEGOTIATION */ - -#if defined(MBEDTLS_X509_CRT_PARSE_C) -static void ssl_clear_peer_cert( mbedtls_ssl_session *session ) -{ -#if defined(MBEDTLS_SSL_KEEP_PEER_CERTIFICATE) - if( session->peer_cert != NULL ) - { - mbedtls_x509_crt_free( session->peer_cert ); - mbedtls_free( session->peer_cert ); - session->peer_cert = NULL; - } -#else /* MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */ - if( session->peer_cert_digest != NULL ) - { - /* Zeroization is not necessary. */ - mbedtls_free( session->peer_cert_digest ); - session->peer_cert_digest = NULL; - session->peer_cert_digest_type = MBEDTLS_MD_NONE; - session->peer_cert_digest_len = 0; - } -#endif /* !MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */ -} -#endif /* MBEDTLS_X509_CRT_PARSE_C */ - -/* - * Handshake functions - */ #if !defined(MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED) -/* No certificate support -> dummy functions */ + int mbedtls_ssl_write_certificate( mbedtls_ssl_context *ssl ) { const mbedtls_ssl_ciphersuite_t *ciphersuite_info = @@ -2065,26 +78,7 @@ int mbedtls_ssl_write_certificate( mbedtls_ssl_context *ssl ) return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); } -int mbedtls_ssl_parse_certificate( mbedtls_ssl_context *ssl ) -{ - const mbedtls_ssl_ciphersuite_t *ciphersuite_info = - ssl->handshake->ciphersuite_info; - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> parse certificate" ) ); - - if( !mbedtls_ssl_ciphersuite_uses_srv_cert( ciphersuite_info ) ) - { - MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= skip parse certificate" ) ); - ssl->state++; - return( 0 ); - } - - MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) ); - return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); -} - #else /* MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED */ -/* Some certificate support -> implement write and parse */ int mbedtls_ssl_write_certificate( mbedtls_ssl_context *ssl ) { @@ -2199,6 +193,212 @@ write_msg: return( ret ); } +#endif /* MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED */ + +/* + * HANDSHAKE STATE: Incoming `Certificate` + */ + +#if !defined(MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED) + +int mbedtls_ssl_parse_certificate( mbedtls_ssl_context *ssl ) +{ + const mbedtls_ssl_ciphersuite_t *ciphersuite_info = + ssl->handshake->ciphersuite_info; + + MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> parse certificate" ) ); + + if( !mbedtls_ssl_ciphersuite_uses_srv_cert( ciphersuite_info ) ) + { + MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= skip parse certificate" ) ); + ssl->state++; + return( 0 ); + } + + MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) ); + return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); +} + +#else /* MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED */ + +/* Check if a certificate message is expected. + * Return either + * - SSL_CERTIFICATE_EXPECTED, or + * - SSL_CERTIFICATE_SKIP + * indicating whether a Certificate message is expected or not. + */ +#define SSL_CERTIFICATE_EXPECTED 0 +#define SSL_CERTIFICATE_SKIP 1 +static int ssl_parse_certificate_coordinate( mbedtls_ssl_context *ssl, + int authmode ); +static int ssl_parse_certificate_chain( mbedtls_ssl_context *ssl, + mbedtls_x509_crt *chain ); +static int ssl_parse_certificate_verify( mbedtls_ssl_context *ssl, + int authmode, + mbedtls_x509_crt *chain, + void *rs_ctx ); + +#if defined(MBEDTLS_SSL_SRV_C) +static int ssl_srv_check_client_no_crt_notification( mbedtls_ssl_context *ssl ); +#endif /* MBEDTLS_SSL_SRV_C */ + +#if !defined(MBEDTLS_SSL_KEEP_PEER_CERTIFICATE) +static int ssl_remember_peer_crt_digest( mbedtls_ssl_context *ssl, + unsigned char *start, size_t len ); +static int ssl_remember_peer_pubkey( mbedtls_ssl_context *ssl, + unsigned char *start, size_t len ); +#endif /* !MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */ + +int mbedtls_ssl_parse_certificate( mbedtls_ssl_context *ssl ) +{ + int ret = 0; + int crt_expected; +#if defined(MBEDTLS_SSL_SRV_C) && defined(MBEDTLS_SSL_SERVER_NAME_INDICATION) + const int authmode = ssl->handshake->sni_authmode != MBEDTLS_SSL_VERIFY_UNSET + ? ssl->handshake->sni_authmode + : ssl->conf->authmode; +#else + const int authmode = ssl->conf->authmode; +#endif + void *rs_ctx = NULL; + mbedtls_x509_crt *chain = NULL; + + MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> parse certificate" ) ); + + crt_expected = ssl_parse_certificate_coordinate( ssl, authmode ); + if( crt_expected == SSL_CERTIFICATE_SKIP ) + { + MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= skip parse certificate" ) ); + goto exit; + } + +#if defined(MBEDTLS_SSL__ECP_RESTARTABLE) + if( ssl->handshake->ecrs_enabled && + ssl->handshake->ecrs_state == ssl_ecrs_crt_verify ) + { + chain = ssl->handshake->ecrs_peer_cert; + ssl->handshake->ecrs_peer_cert = NULL; + goto crt_verify; + } +#endif + + if( ( ret = mbedtls_ssl_read_record( ssl, 1 ) ) != 0 ) + { + /* mbedtls_ssl_read_record may have sent an alert already. We + let it decide whether to alert. */ + MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_read_record", ret ); + goto exit; + } + +#if defined(MBEDTLS_SSL_SRV_C) + if( ssl_srv_check_client_no_crt_notification( ssl ) == 0 ) + { + ssl->session_negotiate->verify_result = MBEDTLS_X509_BADCERT_MISSING; + + if( authmode == MBEDTLS_SSL_VERIFY_OPTIONAL ) + ret = 0; + else + ret = MBEDTLS_ERR_SSL_NO_CLIENT_CERTIFICATE; + + goto exit; + } +#endif /* MBEDTLS_SSL_SRV_C */ + + /* Clear existing peer CRT structure in case we tried to + * reuse a session but it failed, and allocate a new one. */ + mbedtls_ssl_clear_peer_cert( ssl->session_negotiate ); + + chain = mbedtls_calloc( 1, sizeof( mbedtls_x509_crt ) ); + if( chain == NULL ) + { + MBEDTLS_SSL_DEBUG_MSG( 1, ( "alloc(%d bytes) failed", + sizeof( mbedtls_x509_crt ) ) ); + mbedtls_ssl_send_alert_message( ssl, + MBEDTLS_SSL_ALERT_LEVEL_FATAL, + MBEDTLS_SSL_ALERT_MSG_INTERNAL_ERROR ); + + ret = MBEDTLS_ERR_SSL_ALLOC_FAILED; + goto exit; + } + mbedtls_x509_crt_init( chain ); + + ret = ssl_parse_certificate_chain( ssl, chain ); + if( ret != 0 ) + goto exit; + +#if defined(MBEDTLS_SSL__ECP_RESTARTABLE) + if( ssl->handshake->ecrs_enabled) + ssl->handshake->ecrs_state = ssl_ecrs_crt_verify; + +crt_verify: + if( ssl->handshake->ecrs_enabled) + rs_ctx = &ssl->handshake->ecrs_ctx; +#endif + + ret = ssl_parse_certificate_verify( ssl, authmode, + chain, rs_ctx ); + if( ret != 0 ) + goto exit; + +#if !defined(MBEDTLS_SSL_KEEP_PEER_CERTIFICATE) + { + unsigned char *crt_start, *pk_start; + size_t crt_len, pk_len; + + /* We parse the CRT chain without copying, so + * these pointers point into the input buffer, + * and are hence still valid after freeing the + * CRT chain. */ + + crt_start = chain->raw.p; + crt_len = chain->raw.len; + + pk_start = chain->pk_raw.p; + pk_len = chain->pk_raw.len; + + /* Free the CRT structures before computing + * digest and copying the peer's public key. */ + mbedtls_x509_crt_free( chain ); + mbedtls_free( chain ); + chain = NULL; + + ret = ssl_remember_peer_crt_digest( ssl, crt_start, crt_len ); + if( ret != 0 ) + goto exit; + + ret = ssl_remember_peer_pubkey( ssl, pk_start, pk_len ); + if( ret != 0 ) + goto exit; + } +#else /* !MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */ + /* Pass ownership to session structure. */ + ssl->session_negotiate->peer_cert = chain; + chain = NULL; +#endif /* MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */ + + MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= parse certificate" ) ); + +exit: + + if( ret == 0 ) + ssl->state++; + +#if defined(MBEDTLS_SSL__ECP_RESTARTABLE) + if( ret == MBEDTLS_ERR_SSL_CRYPTO_IN_PROGRESS ) + { + ssl->handshake->ecrs_peer_cert = chain; + chain = NULL; + } +#endif + + if( chain != NULL ) + { + mbedtls_x509_crt_free( chain ); + mbedtls_free( chain ); + } + + return( ret ); +} #if defined(MBEDTLS_SSL_RENEGOTIATION) && defined(MBEDTLS_SSL_CLI_C) @@ -2357,7 +557,7 @@ static int ssl_parse_certificate_chain( mbedtls_ssl_context *ssl, } /* Now we can safely free the original chain. */ - ssl_clear_peer_cert( ssl->session ); + mbedtls_ssl_clear_peer_cert( ssl->session ); } #endif /* MBEDTLS_SSL_RENEGOTIATION && MBEDTLS_SSL_CLI_C */ @@ -2400,6 +600,58 @@ static int ssl_parse_certificate_chain( mbedtls_ssl_context *ssl, return( 0 ); } +#if !defined(MBEDTLS_SSL_KEEP_PEER_CERTIFICATE) +static int ssl_remember_peer_crt_digest( mbedtls_ssl_context *ssl, + unsigned char *start, size_t len ) +{ + int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; + /* Remember digest of the peer's end-CRT. */ + ssl->session_negotiate->peer_cert_digest = + mbedtls_calloc( 1, MBEDTLS_SSL_PEER_CERT_DIGEST_DFL_LEN ); + if( ssl->session_negotiate->peer_cert_digest == NULL ) + { + MBEDTLS_SSL_DEBUG_MSG( 1, ( "alloc(%d bytes) failed", + MBEDTLS_SSL_PEER_CERT_DIGEST_DFL_LEN ) ); + mbedtls_ssl_send_alert_message( ssl, + MBEDTLS_SSL_ALERT_LEVEL_FATAL, + MBEDTLS_SSL_ALERT_MSG_INTERNAL_ERROR ); + + return( MBEDTLS_ERR_SSL_ALLOC_FAILED ); + } + + ret = mbedtls_md( mbedtls_md_info_from_type( + MBEDTLS_SSL_PEER_CERT_DIGEST_DFL_TYPE ), + start, len, + ssl->session_negotiate->peer_cert_digest ); + + ssl->session_negotiate->peer_cert_digest_type = + MBEDTLS_SSL_PEER_CERT_DIGEST_DFL_TYPE; + ssl->session_negotiate->peer_cert_digest_len = + MBEDTLS_SSL_PEER_CERT_DIGEST_DFL_LEN; + + return( ret ); +} + +static int ssl_remember_peer_pubkey( mbedtls_ssl_context *ssl, + unsigned char *start, size_t len ) +{ + unsigned char *end = start + len; + int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; + + /* Make a copy of the peer's raw public key. */ + mbedtls_pk_init( &ssl->handshake->peer_pubkey ); + ret = mbedtls_pk_parse_subpubkey( &start, end, + &ssl->handshake->peer_pubkey ); + if( ret != 0 ) + { + /* We should have parsed the public key before. */ + return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); + } + + return( 0 ); +} +#endif /* !MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */ + #if defined(MBEDTLS_SSL_SRV_C) static int ssl_srv_check_client_no_crt_notification( mbedtls_ssl_context *ssl ) { @@ -2442,14 +694,6 @@ static int ssl_srv_check_client_no_crt_notification( mbedtls_ssl_context *ssl ) } #endif /* MBEDTLS_SSL_SRV_C */ -/* Check if a certificate message is expected. - * Return either - * - SSL_CERTIFICATE_EXPECTED, or - * - SSL_CERTIFICATE_SKIP - * indicating whether a Certificate message is expected or not. - */ -#define SSL_CERTIFICATE_EXPECTED 0 -#define SSL_CERTIFICATE_SKIP 1 static int ssl_parse_certificate_coordinate( mbedtls_ssl_context *ssl, int authmode ) { @@ -2666,711 +910,11 @@ static int ssl_parse_certificate_verify( mbedtls_ssl_context *ssl, return( ret ); } -#if !defined(MBEDTLS_SSL_KEEP_PEER_CERTIFICATE) -static int ssl_remember_peer_crt_digest( mbedtls_ssl_context *ssl, - unsigned char *start, size_t len ) -{ - int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; - /* Remember digest of the peer's end-CRT. */ - ssl->session_negotiate->peer_cert_digest = - mbedtls_calloc( 1, MBEDTLS_SSL_PEER_CERT_DIGEST_DFL_LEN ); - if( ssl->session_negotiate->peer_cert_digest == NULL ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "alloc(%d bytes) failed", - MBEDTLS_SSL_PEER_CERT_DIGEST_DFL_LEN ) ); - mbedtls_ssl_send_alert_message( ssl, - MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_INTERNAL_ERROR ); - - return( MBEDTLS_ERR_SSL_ALLOC_FAILED ); - } - - ret = mbedtls_md( mbedtls_md_info_from_type( - MBEDTLS_SSL_PEER_CERT_DIGEST_DFL_TYPE ), - start, len, - ssl->session_negotiate->peer_cert_digest ); - - ssl->session_negotiate->peer_cert_digest_type = - MBEDTLS_SSL_PEER_CERT_DIGEST_DFL_TYPE; - ssl->session_negotiate->peer_cert_digest_len = - MBEDTLS_SSL_PEER_CERT_DIGEST_DFL_LEN; - - return( ret ); -} - -static int ssl_remember_peer_pubkey( mbedtls_ssl_context *ssl, - unsigned char *start, size_t len ) -{ - unsigned char *end = start + len; - int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; - - /* Make a copy of the peer's raw public key. */ - mbedtls_pk_init( &ssl->handshake->peer_pubkey ); - ret = mbedtls_pk_parse_subpubkey( &start, end, - &ssl->handshake->peer_pubkey ); - if( ret != 0 ) - { - /* We should have parsed the public key before. */ - return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); - } - - return( 0 ); -} -#endif /* !MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */ - -int mbedtls_ssl_parse_certificate( mbedtls_ssl_context *ssl ) -{ - int ret = 0; - int crt_expected; -#if defined(MBEDTLS_SSL_SRV_C) && defined(MBEDTLS_SSL_SERVER_NAME_INDICATION) - const int authmode = ssl->handshake->sni_authmode != MBEDTLS_SSL_VERIFY_UNSET - ? ssl->handshake->sni_authmode - : ssl->conf->authmode; -#else - const int authmode = ssl->conf->authmode; -#endif - void *rs_ctx = NULL; - mbedtls_x509_crt *chain = NULL; - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> parse certificate" ) ); - - crt_expected = ssl_parse_certificate_coordinate( ssl, authmode ); - if( crt_expected == SSL_CERTIFICATE_SKIP ) - { - MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= skip parse certificate" ) ); - goto exit; - } - -#if defined(MBEDTLS_SSL__ECP_RESTARTABLE) - if( ssl->handshake->ecrs_enabled && - ssl->handshake->ecrs_state == ssl_ecrs_crt_verify ) - { - chain = ssl->handshake->ecrs_peer_cert; - ssl->handshake->ecrs_peer_cert = NULL; - goto crt_verify; - } -#endif - - if( ( ret = mbedtls_ssl_read_record( ssl, 1 ) ) != 0 ) - { - /* mbedtls_ssl_read_record may have sent an alert already. We - let it decide whether to alert. */ - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_read_record", ret ); - goto exit; - } - -#if defined(MBEDTLS_SSL_SRV_C) - if( ssl_srv_check_client_no_crt_notification( ssl ) == 0 ) - { - ssl->session_negotiate->verify_result = MBEDTLS_X509_BADCERT_MISSING; - - if( authmode == MBEDTLS_SSL_VERIFY_OPTIONAL ) - ret = 0; - else - ret = MBEDTLS_ERR_SSL_NO_CLIENT_CERTIFICATE; - - goto exit; - } -#endif /* MBEDTLS_SSL_SRV_C */ - - /* Clear existing peer CRT structure in case we tried to - * reuse a session but it failed, and allocate a new one. */ - ssl_clear_peer_cert( ssl->session_negotiate ); - - chain = mbedtls_calloc( 1, sizeof( mbedtls_x509_crt ) ); - if( chain == NULL ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "alloc(%d bytes) failed", - sizeof( mbedtls_x509_crt ) ) ); - mbedtls_ssl_send_alert_message( ssl, - MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_INTERNAL_ERROR ); - - ret = MBEDTLS_ERR_SSL_ALLOC_FAILED; - goto exit; - } - mbedtls_x509_crt_init( chain ); - - ret = ssl_parse_certificate_chain( ssl, chain ); - if( ret != 0 ) - goto exit; - -#if defined(MBEDTLS_SSL__ECP_RESTARTABLE) - if( ssl->handshake->ecrs_enabled) - ssl->handshake->ecrs_state = ssl_ecrs_crt_verify; - -crt_verify: - if( ssl->handshake->ecrs_enabled) - rs_ctx = &ssl->handshake->ecrs_ctx; -#endif - - ret = ssl_parse_certificate_verify( ssl, authmode, - chain, rs_ctx ); - if( ret != 0 ) - goto exit; - -#if !defined(MBEDTLS_SSL_KEEP_PEER_CERTIFICATE) - { - unsigned char *crt_start, *pk_start; - size_t crt_len, pk_len; - - /* We parse the CRT chain without copying, so - * these pointers point into the input buffer, - * and are hence still valid after freeing the - * CRT chain. */ - - crt_start = chain->raw.p; - crt_len = chain->raw.len; - - pk_start = chain->pk_raw.p; - pk_len = chain->pk_raw.len; - - /* Free the CRT structures before computing - * digest and copying the peer's public key. */ - mbedtls_x509_crt_free( chain ); - mbedtls_free( chain ); - chain = NULL; - - ret = ssl_remember_peer_crt_digest( ssl, crt_start, crt_len ); - if( ret != 0 ) - goto exit; - - ret = ssl_remember_peer_pubkey( ssl, pk_start, pk_len ); - if( ret != 0 ) - goto exit; - } -#else /* !MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */ - /* Pass ownership to session structure. */ - ssl->session_negotiate->peer_cert = chain; - chain = NULL; -#endif /* MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */ - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= parse certificate" ) ); - -exit: - - if( ret == 0 ) - ssl->state++; - -#if defined(MBEDTLS_SSL__ECP_RESTARTABLE) - if( ret == MBEDTLS_ERR_SSL_CRYPTO_IN_PROGRESS ) - { - ssl->handshake->ecrs_peer_cert = chain; - chain = NULL; - } -#endif - - if( chain != NULL ) - { - mbedtls_x509_crt_free( chain ); - mbedtls_free( chain ); - } - - return( ret ); -} #endif /* MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED */ -void mbedtls_ssl_optimize_checksum( mbedtls_ssl_context *ssl, - const mbedtls_ssl_ciphersuite_t *ciphersuite_info ) -{ - ((void) ciphersuite_info); - -#if defined(MBEDTLS_SSL_PROTO_SSL3) || defined(MBEDTLS_SSL_PROTO_TLS1) || \ - defined(MBEDTLS_SSL_PROTO_TLS1_1) - if( ssl->minor_ver < MBEDTLS_SSL_MINOR_VERSION_3 ) - ssl->handshake->update_checksum = ssl_update_checksum_md5sha1; - else -#endif -#if defined(MBEDTLS_SSL_PROTO_TLS1_2) -#if defined(MBEDTLS_SHA512_C) - if( ciphersuite_info->mac == MBEDTLS_MD_SHA384 ) - ssl->handshake->update_checksum = ssl_update_checksum_sha384; - else -#endif -#if defined(MBEDTLS_SHA256_C) - if( ciphersuite_info->mac != MBEDTLS_MD_SHA384 ) - ssl->handshake->update_checksum = ssl_update_checksum_sha256; - else -#endif -#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */ - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) ); - return; - } -} - -void mbedtls_ssl_reset_checksum( mbedtls_ssl_context *ssl ) -{ -#if defined(MBEDTLS_SSL_PROTO_SSL3) || defined(MBEDTLS_SSL_PROTO_TLS1) || \ - defined(MBEDTLS_SSL_PROTO_TLS1_1) - mbedtls_md5_starts_ret( &ssl->handshake->fin_md5 ); - mbedtls_sha1_starts_ret( &ssl->handshake->fin_sha1 ); -#endif -#if defined(MBEDTLS_SSL_PROTO_TLS1_2) -#if defined(MBEDTLS_SHA256_C) -#if defined(MBEDTLS_USE_PSA_CRYPTO) - psa_hash_abort( &ssl->handshake->fin_sha256_psa ); - psa_hash_setup( &ssl->handshake->fin_sha256_psa, PSA_ALG_SHA_256 ); -#else - mbedtls_sha256_starts_ret( &ssl->handshake->fin_sha256, 0 ); -#endif -#endif -#if defined(MBEDTLS_SHA512_C) -#if defined(MBEDTLS_USE_PSA_CRYPTO) - psa_hash_abort( &ssl->handshake->fin_sha384_psa ); - psa_hash_setup( &ssl->handshake->fin_sha384_psa, PSA_ALG_SHA_384 ); -#else - mbedtls_sha512_starts_ret( &ssl->handshake->fin_sha512, 1 ); -#endif -#endif -#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */ -} - -static void ssl_update_checksum_start( mbedtls_ssl_context *ssl, - const unsigned char *buf, size_t len ) -{ -#if defined(MBEDTLS_SSL_PROTO_SSL3) || defined(MBEDTLS_SSL_PROTO_TLS1) || \ - defined(MBEDTLS_SSL_PROTO_TLS1_1) - mbedtls_md5_update_ret( &ssl->handshake->fin_md5 , buf, len ); - mbedtls_sha1_update_ret( &ssl->handshake->fin_sha1, buf, len ); -#endif -#if defined(MBEDTLS_SSL_PROTO_TLS1_2) -#if defined(MBEDTLS_SHA256_C) -#if defined(MBEDTLS_USE_PSA_CRYPTO) - psa_hash_update( &ssl->handshake->fin_sha256_psa, buf, len ); -#else - mbedtls_sha256_update_ret( &ssl->handshake->fin_sha256, buf, len ); -#endif -#endif -#if defined(MBEDTLS_SHA512_C) -#if defined(MBEDTLS_USE_PSA_CRYPTO) - psa_hash_update( &ssl->handshake->fin_sha384_psa, buf, len ); -#else - mbedtls_sha512_update_ret( &ssl->handshake->fin_sha512, buf, len ); -#endif -#endif -#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */ -} - -#if defined(MBEDTLS_SSL_PROTO_SSL3) || defined(MBEDTLS_SSL_PROTO_TLS1) || \ - defined(MBEDTLS_SSL_PROTO_TLS1_1) -static void ssl_update_checksum_md5sha1( mbedtls_ssl_context *ssl, - const unsigned char *buf, size_t len ) -{ - mbedtls_md5_update_ret( &ssl->handshake->fin_md5 , buf, len ); - mbedtls_sha1_update_ret( &ssl->handshake->fin_sha1, buf, len ); -} -#endif - -#if defined(MBEDTLS_SSL_PROTO_TLS1_2) -#if defined(MBEDTLS_SHA256_C) -static void ssl_update_checksum_sha256( mbedtls_ssl_context *ssl, - const unsigned char *buf, size_t len ) -{ -#if defined(MBEDTLS_USE_PSA_CRYPTO) - psa_hash_update( &ssl->handshake->fin_sha256_psa, buf, len ); -#else - mbedtls_sha256_update_ret( &ssl->handshake->fin_sha256, buf, len ); -#endif -} -#endif - -#if defined(MBEDTLS_SHA512_C) -static void ssl_update_checksum_sha384( mbedtls_ssl_context *ssl, - const unsigned char *buf, size_t len ) -{ -#if defined(MBEDTLS_USE_PSA_CRYPTO) - psa_hash_update( &ssl->handshake->fin_sha384_psa, buf, len ); -#else - mbedtls_sha512_update_ret( &ssl->handshake->fin_sha512, buf, len ); -#endif -} -#endif -#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */ - -#if defined(MBEDTLS_SSL_PROTO_SSL3) -static void ssl_calc_finished_ssl( - mbedtls_ssl_context *ssl, unsigned char *buf, int from ) -{ - const char *sender; - mbedtls_md5_context md5; - mbedtls_sha1_context sha1; - - unsigned char padbuf[48]; - unsigned char md5sum[16]; - unsigned char sha1sum[20]; - - mbedtls_ssl_session *session = ssl->session_negotiate; - if( !session ) - session = ssl->session; - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> calc finished ssl" ) ); - - mbedtls_md5_init( &md5 ); - mbedtls_sha1_init( &sha1 ); - - mbedtls_md5_clone( &md5, &ssl->handshake->fin_md5 ); - mbedtls_sha1_clone( &sha1, &ssl->handshake->fin_sha1 ); - - /* - * SSLv3: - * hash = - * MD5( master + pad2 + - * MD5( handshake + sender + master + pad1 ) ) - * + SHA1( master + pad2 + - * SHA1( handshake + sender + master + pad1 ) ) - */ - -#if !defined(MBEDTLS_MD5_ALT) - MBEDTLS_SSL_DEBUG_BUF( 4, "finished md5 state", (unsigned char *) - md5.state, sizeof( md5.state ) ); -#endif - -#if !defined(MBEDTLS_SHA1_ALT) - MBEDTLS_SSL_DEBUG_BUF( 4, "finished sha1 state", (unsigned char *) - sha1.state, sizeof( sha1.state ) ); -#endif - - sender = ( from == MBEDTLS_SSL_IS_CLIENT ) ? "CLNT" - : "SRVR"; - - memset( padbuf, 0x36, 48 ); - - mbedtls_md5_update_ret( &md5, (const unsigned char *) sender, 4 ); - mbedtls_md5_update_ret( &md5, session->master, 48 ); - mbedtls_md5_update_ret( &md5, padbuf, 48 ); - mbedtls_md5_finish_ret( &md5, md5sum ); - - mbedtls_sha1_update_ret( &sha1, (const unsigned char *) sender, 4 ); - mbedtls_sha1_update_ret( &sha1, session->master, 48 ); - mbedtls_sha1_update_ret( &sha1, padbuf, 40 ); - mbedtls_sha1_finish_ret( &sha1, sha1sum ); - - memset( padbuf, 0x5C, 48 ); - - mbedtls_md5_starts_ret( &md5 ); - mbedtls_md5_update_ret( &md5, session->master, 48 ); - mbedtls_md5_update_ret( &md5, padbuf, 48 ); - mbedtls_md5_update_ret( &md5, md5sum, 16 ); - mbedtls_md5_finish_ret( &md5, buf ); - - mbedtls_sha1_starts_ret( &sha1 ); - mbedtls_sha1_update_ret( &sha1, session->master, 48 ); - mbedtls_sha1_update_ret( &sha1, padbuf , 40 ); - mbedtls_sha1_update_ret( &sha1, sha1sum, 20 ); - mbedtls_sha1_finish_ret( &sha1, buf + 16 ); - - MBEDTLS_SSL_DEBUG_BUF( 3, "calc finished result", buf, 36 ); - - mbedtls_md5_free( &md5 ); - mbedtls_sha1_free( &sha1 ); - - mbedtls_platform_zeroize( padbuf, sizeof( padbuf ) ); - mbedtls_platform_zeroize( md5sum, sizeof( md5sum ) ); - mbedtls_platform_zeroize( sha1sum, sizeof( sha1sum ) ); - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= calc finished" ) ); -} -#endif /* MBEDTLS_SSL_PROTO_SSL3 */ - -#if defined(MBEDTLS_SSL_PROTO_TLS1) || defined(MBEDTLS_SSL_PROTO_TLS1_1) -static void ssl_calc_finished_tls( - mbedtls_ssl_context *ssl, unsigned char *buf, int from ) -{ - int len = 12; - const char *sender; - mbedtls_md5_context md5; - mbedtls_sha1_context sha1; - unsigned char padbuf[36]; - - mbedtls_ssl_session *session = ssl->session_negotiate; - if( !session ) - session = ssl->session; - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> calc finished tls" ) ); - - mbedtls_md5_init( &md5 ); - mbedtls_sha1_init( &sha1 ); - - mbedtls_md5_clone( &md5, &ssl->handshake->fin_md5 ); - mbedtls_sha1_clone( &sha1, &ssl->handshake->fin_sha1 ); - - /* - * TLSv1: - * hash = PRF( master, finished_label, - * MD5( handshake ) + SHA1( handshake ) )[0..11] - */ - -#if !defined(MBEDTLS_MD5_ALT) - MBEDTLS_SSL_DEBUG_BUF( 4, "finished md5 state", (unsigned char *) - md5.state, sizeof( md5.state ) ); -#endif - -#if !defined(MBEDTLS_SHA1_ALT) - MBEDTLS_SSL_DEBUG_BUF( 4, "finished sha1 state", (unsigned char *) - sha1.state, sizeof( sha1.state ) ); -#endif - - sender = ( from == MBEDTLS_SSL_IS_CLIENT ) - ? "client finished" - : "server finished"; - - mbedtls_md5_finish_ret( &md5, padbuf ); - mbedtls_sha1_finish_ret( &sha1, padbuf + 16 ); - - ssl->handshake->tls_prf( session->master, 48, sender, - padbuf, 36, buf, len ); - - MBEDTLS_SSL_DEBUG_BUF( 3, "calc finished result", buf, len ); - - mbedtls_md5_free( &md5 ); - mbedtls_sha1_free( &sha1 ); - - mbedtls_platform_zeroize( padbuf, sizeof( padbuf ) ); - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= calc finished" ) ); -} -#endif /* MBEDTLS_SSL_PROTO_TLS1 || MBEDTLS_SSL_PROTO_TLS1_1 */ - -#if defined(MBEDTLS_SSL_PROTO_TLS1_2) -#if defined(MBEDTLS_SHA256_C) -static void ssl_calc_finished_tls_sha256( - mbedtls_ssl_context *ssl, unsigned char *buf, int from ) -{ - int len = 12; - const char *sender; - unsigned char padbuf[32]; -#if defined(MBEDTLS_USE_PSA_CRYPTO) - size_t hash_size; - psa_hash_operation_t sha256_psa = PSA_HASH_OPERATION_INIT; - psa_status_t status; -#else - mbedtls_sha256_context sha256; -#endif - - mbedtls_ssl_session *session = ssl->session_negotiate; - if( !session ) - session = ssl->session; - - sender = ( from == MBEDTLS_SSL_IS_CLIENT ) - ? "client finished" - : "server finished"; - -#if defined(MBEDTLS_USE_PSA_CRYPTO) - sha256_psa = psa_hash_operation_init(); - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> calc PSA finished tls sha256" ) ); - - status = psa_hash_clone( &ssl->handshake->fin_sha256_psa, &sha256_psa ); - if( status != PSA_SUCCESS ) - { - MBEDTLS_SSL_DEBUG_MSG( 2, ( "PSA hash clone failed" ) ); - return; - } - - status = psa_hash_finish( &sha256_psa, padbuf, sizeof( padbuf ), &hash_size ); - if( status != PSA_SUCCESS ) - { - MBEDTLS_SSL_DEBUG_MSG( 2, ( "PSA hash finish failed" ) ); - return; - } - MBEDTLS_SSL_DEBUG_BUF( 3, "PSA calculated padbuf", padbuf, 32 ); -#else - - mbedtls_sha256_init( &sha256 ); - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> calc finished tls sha256" ) ); - - mbedtls_sha256_clone( &sha256, &ssl->handshake->fin_sha256 ); - - /* - * TLSv1.2: - * hash = PRF( master, finished_label, - * Hash( handshake ) )[0.11] - */ - -#if !defined(MBEDTLS_SHA256_ALT) - MBEDTLS_SSL_DEBUG_BUF( 4, "finished sha2 state", (unsigned char *) - sha256.state, sizeof( sha256.state ) ); -#endif - - mbedtls_sha256_finish_ret( &sha256, padbuf ); - mbedtls_sha256_free( &sha256 ); -#endif /* MBEDTLS_USE_PSA_CRYPTO */ - - ssl->handshake->tls_prf( session->master, 48, sender, - padbuf, 32, buf, len ); - - MBEDTLS_SSL_DEBUG_BUF( 3, "calc finished result", buf, len ); - - mbedtls_platform_zeroize( padbuf, sizeof( padbuf ) ); - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= calc finished" ) ); -} -#endif /* MBEDTLS_SHA256_C */ - -#if defined(MBEDTLS_SHA512_C) -static void ssl_calc_finished_tls_sha384( - mbedtls_ssl_context *ssl, unsigned char *buf, int from ) -{ - int len = 12; - const char *sender; - unsigned char padbuf[48]; -#if defined(MBEDTLS_USE_PSA_CRYPTO) - size_t hash_size; - psa_hash_operation_t sha384_psa = PSA_HASH_OPERATION_INIT; - psa_status_t status; -#else - mbedtls_sha512_context sha512; -#endif - - mbedtls_ssl_session *session = ssl->session_negotiate; - if( !session ) - session = ssl->session; - - sender = ( from == MBEDTLS_SSL_IS_CLIENT ) - ? "client finished" - : "server finished"; - -#if defined(MBEDTLS_USE_PSA_CRYPTO) - sha384_psa = psa_hash_operation_init(); - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> calc PSA finished tls sha384" ) ); - - status = psa_hash_clone( &ssl->handshake->fin_sha384_psa, &sha384_psa ); - if( status != PSA_SUCCESS ) - { - MBEDTLS_SSL_DEBUG_MSG( 2, ( "PSA hash clone failed" ) ); - return; - } - - status = psa_hash_finish( &sha384_psa, padbuf, sizeof( padbuf ), &hash_size ); - if( status != PSA_SUCCESS ) - { - MBEDTLS_SSL_DEBUG_MSG( 2, ( "PSA hash finish failed" ) ); - return; - } - MBEDTLS_SSL_DEBUG_BUF( 3, "PSA calculated padbuf", padbuf, 48 ); -#else - mbedtls_sha512_init( &sha512 ); - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> calc finished tls sha384" ) ); - - mbedtls_sha512_clone( &sha512, &ssl->handshake->fin_sha512 ); - - /* - * TLSv1.2: - * hash = PRF( master, finished_label, - * Hash( handshake ) )[0.11] - */ - -#if !defined(MBEDTLS_SHA512_ALT) - MBEDTLS_SSL_DEBUG_BUF( 4, "finished sha512 state", (unsigned char *) - sha512.state, sizeof( sha512.state ) ); -#endif - - mbedtls_sha512_finish_ret( &sha512, padbuf ); - mbedtls_sha512_free( &sha512 ); -#endif - - ssl->handshake->tls_prf( session->master, 48, sender, - padbuf, 48, buf, len ); - - MBEDTLS_SSL_DEBUG_BUF( 3, "calc finished result", buf, len ); - - mbedtls_platform_zeroize( padbuf, sizeof( padbuf ) ); - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= calc finished" ) ); -} -#endif /* MBEDTLS_SHA512_C */ -#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */ - -void mbedtls_ssl_handshake_wrapup_free_hs_transform( mbedtls_ssl_context *ssl ) -{ - MBEDTLS_SSL_DEBUG_MSG( 3, ( "=> handshake wrapup: final free" ) ); - - /* - * Free our handshake params - */ - mbedtls_ssl_handshake_free( ssl ); - mbedtls_free( ssl->handshake ); - ssl->handshake = NULL; - - /* - * Free the previous transform and swith in the current one - */ - if( ssl->transform ) - { - mbedtls_ssl_transform_free( ssl->transform ); - mbedtls_free( ssl->transform ); - } - ssl->transform = ssl->transform_negotiate; - ssl->transform_negotiate = NULL; - - MBEDTLS_SSL_DEBUG_MSG( 3, ( "<= handshake wrapup: final free" ) ); -} - -void mbedtls_ssl_handshake_wrapup( mbedtls_ssl_context *ssl ) -{ - int resume = ssl->handshake->resume; - - MBEDTLS_SSL_DEBUG_MSG( 3, ( "=> handshake wrapup" ) ); - -#if defined(MBEDTLS_SSL_RENEGOTIATION) - if( ssl->renego_status == MBEDTLS_SSL_RENEGOTIATION_IN_PROGRESS ) - { - ssl->renego_status = MBEDTLS_SSL_RENEGOTIATION_DONE; - ssl->renego_records_seen = 0; - } -#endif - - /* - * Free the previous session and switch in the current one - */ - if( ssl->session ) - { -#if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC) - /* RFC 7366 3.1: keep the EtM state */ - ssl->session_negotiate->encrypt_then_mac = - ssl->session->encrypt_then_mac; -#endif - - mbedtls_ssl_session_free( ssl->session ); - mbedtls_free( ssl->session ); - } - ssl->session = ssl->session_negotiate; - ssl->session_negotiate = NULL; - - /* - * Add cache entry - */ - if( ssl->conf->f_set_cache != NULL && - ssl->session->id_len != 0 && - resume == 0 ) - { - if( ssl->conf->f_set_cache( ssl->conf->p_cache, ssl->session ) != 0 ) - MBEDTLS_SSL_DEBUG_MSG( 1, ( "cache did not store session" ) ); - } - -#if defined(MBEDTLS_SSL_PROTO_DTLS) - if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM && - ssl->handshake->flight != NULL ) - { - /* Cancel handshake timer */ - mbedtls_ssl_set_timer( ssl, 0 ); - - /* Keep last flight around in case we need to resend it: - * we need the handshake and transform structures for that */ - MBEDTLS_SSL_DEBUG_MSG( 3, ( "skip freeing handshake and transform" ) ); - } - else -#endif - mbedtls_ssl_handshake_wrapup_free_hs_transform( ssl ); - - ssl->state++; - - MBEDTLS_SSL_DEBUG_MSG( 3, ( "<= handshake wrapup" ) ); -} +/* + * HANDSHAKE STATE: Outgoing `Finished` + */ int mbedtls_ssl_write_finished( mbedtls_ssl_context *ssl ) { @@ -3496,6 +1040,10 @@ int mbedtls_ssl_write_finished( mbedtls_ssl_context *ssl ) #define SSL_MAX_HASH_LEN 12 #endif +/* + * HANDSHAKE STATE: Incoming `Finished` + */ + int mbedtls_ssl_parse_finished( mbedtls_ssl_context *ssl ) { int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; @@ -3575,3831 +1123,4 @@ int mbedtls_ssl_parse_finished( mbedtls_ssl_context *ssl ) return( 0 ); } -static void ssl_handshake_params_init( mbedtls_ssl_handshake_params *handshake ) -{ - memset( handshake, 0, sizeof( mbedtls_ssl_handshake_params ) ); - -#if defined(MBEDTLS_SSL_PROTO_SSL3) || defined(MBEDTLS_SSL_PROTO_TLS1) || \ - defined(MBEDTLS_SSL_PROTO_TLS1_1) - mbedtls_md5_init( &handshake->fin_md5 ); - mbedtls_sha1_init( &handshake->fin_sha1 ); - mbedtls_md5_starts_ret( &handshake->fin_md5 ); - mbedtls_sha1_starts_ret( &handshake->fin_sha1 ); -#endif -#if defined(MBEDTLS_SSL_PROTO_TLS1_2) -#if defined(MBEDTLS_SHA256_C) -#if defined(MBEDTLS_USE_PSA_CRYPTO) - handshake->fin_sha256_psa = psa_hash_operation_init(); - psa_hash_setup( &handshake->fin_sha256_psa, PSA_ALG_SHA_256 ); -#else - mbedtls_sha256_init( &handshake->fin_sha256 ); - mbedtls_sha256_starts_ret( &handshake->fin_sha256, 0 ); -#endif -#endif -#if defined(MBEDTLS_SHA512_C) -#if defined(MBEDTLS_USE_PSA_CRYPTO) - handshake->fin_sha384_psa = psa_hash_operation_init(); - psa_hash_setup( &handshake->fin_sha384_psa, PSA_ALG_SHA_384 ); -#else - mbedtls_sha512_init( &handshake->fin_sha512 ); - mbedtls_sha512_starts_ret( &handshake->fin_sha512, 1 ); -#endif -#endif -#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */ - - handshake->update_checksum = ssl_update_checksum_start; - -#if defined(MBEDTLS_SSL_PROTO_TLS1_2) && \ - defined(MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED) - mbedtls_ssl_sig_hash_set_init( &handshake->hash_algs ); -#endif - -#if defined(MBEDTLS_DHM_C) - mbedtls_dhm_init( &handshake->dhm_ctx ); -#endif -#if defined(MBEDTLS_ECDH_C) - mbedtls_ecdh_init( &handshake->ecdh_ctx ); -#endif -#if defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED) - mbedtls_ecjpake_init( &handshake->ecjpake_ctx ); -#if defined(MBEDTLS_SSL_CLI_C) - handshake->ecjpake_cache = NULL; - handshake->ecjpake_cache_len = 0; -#endif -#endif - -#if defined(MBEDTLS_SSL__ECP_RESTARTABLE) - mbedtls_x509_crt_restart_init( &handshake->ecrs_ctx ); -#endif - -#if defined(MBEDTLS_SSL_SERVER_NAME_INDICATION) - handshake->sni_authmode = MBEDTLS_SSL_VERIFY_UNSET; -#endif - -#if defined(MBEDTLS_X509_CRT_PARSE_C) && \ - !defined(MBEDTLS_SSL_KEEP_PEER_CERTIFICATE) - mbedtls_pk_init( &handshake->peer_pubkey ); -#endif -} - -void mbedtls_ssl_transform_init( mbedtls_ssl_transform *transform ) -{ - memset( transform, 0, sizeof(mbedtls_ssl_transform) ); - - mbedtls_cipher_init( &transform->cipher_ctx_enc ); - mbedtls_cipher_init( &transform->cipher_ctx_dec ); - -#if defined(MBEDTLS_SSL_SOME_MODES_USE_MAC) - mbedtls_md_init( &transform->md_ctx_enc ); - mbedtls_md_init( &transform->md_ctx_dec ); -#endif -} - -void mbedtls_ssl_session_init( mbedtls_ssl_session *session ) -{ - memset( session, 0, sizeof(mbedtls_ssl_session) ); -} - -static int ssl_handshake_init( mbedtls_ssl_context *ssl ) -{ - /* Clear old handshake information if present */ - if( ssl->transform_negotiate ) - mbedtls_ssl_transform_free( ssl->transform_negotiate ); - if( ssl->session_negotiate ) - mbedtls_ssl_session_free( ssl->session_negotiate ); - if( ssl->handshake ) - mbedtls_ssl_handshake_free( ssl ); - - /* - * Either the pointers are now NULL or cleared properly and can be freed. - * Now allocate missing structures. - */ - if( ssl->transform_negotiate == NULL ) - { - ssl->transform_negotiate = mbedtls_calloc( 1, sizeof(mbedtls_ssl_transform) ); - } - - if( ssl->session_negotiate == NULL ) - { - ssl->session_negotiate = mbedtls_calloc( 1, sizeof(mbedtls_ssl_session) ); - } - - if( ssl->handshake == NULL ) - { - ssl->handshake = mbedtls_calloc( 1, sizeof(mbedtls_ssl_handshake_params) ); - } - - /* All pointers should exist and can be directly freed without issue */ - if( ssl->handshake == NULL || - ssl->transform_negotiate == NULL || - ssl->session_negotiate == NULL ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "alloc() of ssl sub-contexts failed" ) ); - - mbedtls_free( ssl->handshake ); - mbedtls_free( ssl->transform_negotiate ); - mbedtls_free( ssl->session_negotiate ); - - ssl->handshake = NULL; - ssl->transform_negotiate = NULL; - ssl->session_negotiate = NULL; - - return( MBEDTLS_ERR_SSL_ALLOC_FAILED ); - } - - /* Initialize structures */ - mbedtls_ssl_session_init( ssl->session_negotiate ); - mbedtls_ssl_transform_init( ssl->transform_negotiate ); - ssl_handshake_params_init( ssl->handshake ); - -#if defined(MBEDTLS_SSL_PROTO_DTLS) - if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM ) - { - ssl->handshake->alt_transform_out = ssl->transform_out; - - if( ssl->conf->endpoint == MBEDTLS_SSL_IS_CLIENT ) - ssl->handshake->retransmit_state = MBEDTLS_SSL_RETRANS_PREPARING; - else - ssl->handshake->retransmit_state = MBEDTLS_SSL_RETRANS_WAITING; - - mbedtls_ssl_set_timer( ssl, 0 ); - } -#endif - - return( 0 ); -} - -#if defined(MBEDTLS_SSL_DTLS_HELLO_VERIFY) && defined(MBEDTLS_SSL_SRV_C) -/* Dummy cookie callbacks for defaults */ -static int ssl_cookie_write_dummy( void *ctx, - unsigned char **p, unsigned char *end, - const unsigned char *cli_id, size_t cli_id_len ) -{ - ((void) ctx); - ((void) p); - ((void) end); - ((void) cli_id); - ((void) cli_id_len); - - return( MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE ); -} - -static int ssl_cookie_check_dummy( void *ctx, - const unsigned char *cookie, size_t cookie_len, - const unsigned char *cli_id, size_t cli_id_len ) -{ - ((void) ctx); - ((void) cookie); - ((void) cookie_len); - ((void) cli_id); - ((void) cli_id_len); - - return( MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE ); -} -#endif /* MBEDTLS_SSL_DTLS_HELLO_VERIFY && MBEDTLS_SSL_SRV_C */ - -/* - * Initialize an SSL context - */ - -void mbedtls_ssl_init( mbedtls_ssl_context *ssl ) -{ - memset( ssl, 0, sizeof( mbedtls_ssl_context ) ); -} - -/* - * Setup an SSL context - */ - -int mbedtls_ssl_setup( mbedtls_ssl_context *ssl, - const mbedtls_ssl_config *conf ) -{ - int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; - - ssl->conf = conf; - - /* - * Prepare base structures - */ - - /* Set to NULL in case of an error condition */ - ssl->out_buf = NULL; - - ssl->in_buf = mbedtls_calloc( 1, MBEDTLS_SSL_IN_BUFFER_LEN ); - if( ssl->in_buf == NULL ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "alloc(%d bytes) failed", MBEDTLS_SSL_IN_BUFFER_LEN) ); - ret = MBEDTLS_ERR_SSL_ALLOC_FAILED; - goto error; - } - - ssl->out_buf = mbedtls_calloc( 1, MBEDTLS_SSL_OUT_BUFFER_LEN ); - if( ssl->out_buf == NULL ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "alloc(%d bytes) failed", MBEDTLS_SSL_OUT_BUFFER_LEN) ); - ret = MBEDTLS_ERR_SSL_ALLOC_FAILED; - goto error; - } - - mbedtls_ssl_reset_in_out_pointers( ssl ); - - if( ( ret = ssl_handshake_init( ssl ) ) != 0 ) - goto error; - - return( 0 ); - -error: - mbedtls_free( ssl->in_buf ); - mbedtls_free( ssl->out_buf ); - - ssl->conf = NULL; - - ssl->in_buf = NULL; - ssl->out_buf = NULL; - - ssl->in_hdr = NULL; - ssl->in_ctr = NULL; - ssl->in_len = NULL; - ssl->in_iv = NULL; - ssl->in_msg = NULL; - - ssl->out_hdr = NULL; - ssl->out_ctr = NULL; - ssl->out_len = NULL; - ssl->out_iv = NULL; - ssl->out_msg = NULL; - - return( ret ); -} - -/* - * Reset an initialized and used SSL context for re-use while retaining - * all application-set variables, function pointers and data. - * - * If partial is non-zero, keep data in the input buffer and client ID. - * (Use when a DTLS client reconnects from the same port.) - */ -int mbedtls_ssl_session_reset_int( mbedtls_ssl_context *ssl, int partial ) -{ - int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; - -#if !defined(MBEDTLS_SSL_DTLS_CLIENT_PORT_REUSE) || \ - !defined(MBEDTLS_SSL_SRV_C) - ((void) partial); -#endif - - ssl->state = MBEDTLS_SSL_HELLO_REQUEST; - - /* Cancel any possibly running timer */ - mbedtls_ssl_set_timer( ssl, 0 ); - -#if defined(MBEDTLS_SSL_RENEGOTIATION) - ssl->renego_status = MBEDTLS_SSL_INITIAL_HANDSHAKE; - ssl->renego_records_seen = 0; - - ssl->verify_data_len = 0; - memset( ssl->own_verify_data, 0, MBEDTLS_SSL_VERIFY_DATA_MAX_LEN ); - memset( ssl->peer_verify_data, 0, MBEDTLS_SSL_VERIFY_DATA_MAX_LEN ); -#endif - ssl->secure_renegotiation = MBEDTLS_SSL_LEGACY_RENEGOTIATION; - - ssl->in_offt = NULL; - mbedtls_ssl_reset_in_out_pointers( ssl ); - - ssl->in_msgtype = 0; - ssl->in_msglen = 0; -#if defined(MBEDTLS_SSL_PROTO_DTLS) - ssl->next_record_offset = 0; - ssl->in_epoch = 0; -#endif -#if defined(MBEDTLS_SSL_DTLS_ANTI_REPLAY) - mbedtls_ssl_dtls_replay_reset( ssl ); -#endif - - ssl->in_hslen = 0; - ssl->nb_zero = 0; - - ssl->keep_current_message = 0; - - ssl->out_msgtype = 0; - ssl->out_msglen = 0; - ssl->out_left = 0; -#if defined(MBEDTLS_SSL_CBC_RECORD_SPLITTING) - if( ssl->split_done != MBEDTLS_SSL_CBC_RECORD_SPLITTING_DISABLED ) - ssl->split_done = 0; -#endif - - memset( ssl->cur_out_ctr, 0, sizeof( ssl->cur_out_ctr ) ); - - ssl->transform_in = NULL; - ssl->transform_out = NULL; - - ssl->session_in = NULL; - ssl->session_out = NULL; - - memset( ssl->out_buf, 0, MBEDTLS_SSL_OUT_BUFFER_LEN ); - -#if defined(MBEDTLS_SSL_DTLS_CLIENT_PORT_REUSE) && defined(MBEDTLS_SSL_SRV_C) - if( partial == 0 ) -#endif /* MBEDTLS_SSL_DTLS_CLIENT_PORT_REUSE && MBEDTLS_SSL_SRV_C */ - { - ssl->in_left = 0; - memset( ssl->in_buf, 0, MBEDTLS_SSL_IN_BUFFER_LEN ); - } - -#if defined(MBEDTLS_SSL_HW_RECORD_ACCEL) - if( mbedtls_ssl_hw_record_reset != NULL ) - { - MBEDTLS_SSL_DEBUG_MSG( 2, ( "going for mbedtls_ssl_hw_record_reset()" ) ); - if( ( ret = mbedtls_ssl_hw_record_reset( ssl ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_hw_record_reset", ret ); - return( MBEDTLS_ERR_SSL_HW_ACCEL_FAILED ); - } - } -#endif - - if( ssl->transform ) - { - mbedtls_ssl_transform_free( ssl->transform ); - mbedtls_free( ssl->transform ); - ssl->transform = NULL; - } - - if( ssl->session ) - { - mbedtls_ssl_session_free( ssl->session ); - mbedtls_free( ssl->session ); - ssl->session = NULL; - } - -#if defined(MBEDTLS_SSL_ALPN) - ssl->alpn_chosen = NULL; -#endif - -#if defined(MBEDTLS_SSL_DTLS_HELLO_VERIFY) && defined(MBEDTLS_SSL_SRV_C) -#if defined(MBEDTLS_SSL_DTLS_CLIENT_PORT_REUSE) - if( partial == 0 ) -#endif - { - mbedtls_free( ssl->cli_id ); - ssl->cli_id = NULL; - ssl->cli_id_len = 0; - } -#endif - - if( ( ret = ssl_handshake_init( ssl ) ) != 0 ) - return( ret ); - - return( 0 ); -} - -/* - * Reset an initialized and used SSL context for re-use while retaining - * all application-set variables, function pointers and data. - */ -int mbedtls_ssl_session_reset( mbedtls_ssl_context *ssl ) -{ - return( mbedtls_ssl_session_reset_int( ssl, 0 ) ); -} - -/* - * SSL set accessors - */ -void mbedtls_ssl_conf_endpoint( mbedtls_ssl_config *conf, int endpoint ) -{ - conf->endpoint = endpoint; -} - -void mbedtls_ssl_conf_transport( mbedtls_ssl_config *conf, int transport ) -{ - conf->transport = transport; -} - -#if defined(MBEDTLS_SSL_DTLS_ANTI_REPLAY) -void mbedtls_ssl_conf_dtls_anti_replay( mbedtls_ssl_config *conf, char mode ) -{ - conf->anti_replay = mode; -} -#endif - -#if defined(MBEDTLS_SSL_DTLS_BADMAC_LIMIT) -void mbedtls_ssl_conf_dtls_badmac_limit( mbedtls_ssl_config *conf, unsigned limit ) -{ - conf->badmac_limit = limit; -} -#endif - -#if defined(MBEDTLS_SSL_PROTO_DTLS) - -void mbedtls_ssl_set_datagram_packing( mbedtls_ssl_context *ssl, - unsigned allow_packing ) -{ - ssl->disable_datagram_packing = !allow_packing; -} - -void mbedtls_ssl_conf_handshake_timeout( mbedtls_ssl_config *conf, - uint32_t min, uint32_t max ) -{ - conf->hs_timeout_min = min; - conf->hs_timeout_max = max; -} -#endif - -void mbedtls_ssl_conf_authmode( mbedtls_ssl_config *conf, int authmode ) -{ - conf->authmode = authmode; -} - -#if defined(MBEDTLS_X509_CRT_PARSE_C) -void mbedtls_ssl_conf_verify( mbedtls_ssl_config *conf, - int (*f_vrfy)(void *, mbedtls_x509_crt *, int, uint32_t *), - void *p_vrfy ) -{ - conf->f_vrfy = f_vrfy; - conf->p_vrfy = p_vrfy; -} -#endif /* MBEDTLS_X509_CRT_PARSE_C */ - -void mbedtls_ssl_conf_rng( mbedtls_ssl_config *conf, - int (*f_rng)(void *, unsigned char *, size_t), - void *p_rng ) -{ - conf->f_rng = f_rng; - conf->p_rng = p_rng; -} - -void mbedtls_ssl_conf_dbg( mbedtls_ssl_config *conf, - void (*f_dbg)(void *, int, const char *, int, const char *), - void *p_dbg ) -{ - conf->f_dbg = f_dbg; - conf->p_dbg = p_dbg; -} - -void mbedtls_ssl_set_bio( mbedtls_ssl_context *ssl, - void *p_bio, - mbedtls_ssl_send_t *f_send, - mbedtls_ssl_recv_t *f_recv, - mbedtls_ssl_recv_timeout_t *f_recv_timeout ) -{ - ssl->p_bio = p_bio; - ssl->f_send = f_send; - ssl->f_recv = f_recv; - ssl->f_recv_timeout = f_recv_timeout; -} - -#if defined(MBEDTLS_SSL_PROTO_DTLS) -void mbedtls_ssl_set_mtu( mbedtls_ssl_context *ssl, uint16_t mtu ) -{ - ssl->mtu = mtu; -} -#endif - -void mbedtls_ssl_conf_read_timeout( mbedtls_ssl_config *conf, uint32_t timeout ) -{ - conf->read_timeout = timeout; -} - -void mbedtls_ssl_set_timer_cb( mbedtls_ssl_context *ssl, - void *p_timer, - mbedtls_ssl_set_timer_t *f_set_timer, - mbedtls_ssl_get_timer_t *f_get_timer ) -{ - ssl->p_timer = p_timer; - ssl->f_set_timer = f_set_timer; - ssl->f_get_timer = f_get_timer; - - /* Make sure we start with no timer running */ - mbedtls_ssl_set_timer( ssl, 0 ); -} - -#if defined(MBEDTLS_SSL_SRV_C) -void mbedtls_ssl_conf_session_cache( mbedtls_ssl_config *conf, - void *p_cache, - int (*f_get_cache)(void *, mbedtls_ssl_session *), - int (*f_set_cache)(void *, const mbedtls_ssl_session *) ) -{ - conf->p_cache = p_cache; - conf->f_get_cache = f_get_cache; - conf->f_set_cache = f_set_cache; -} -#endif /* MBEDTLS_SSL_SRV_C */ - -#if defined(MBEDTLS_SSL_CLI_C) -int mbedtls_ssl_set_session( mbedtls_ssl_context *ssl, const mbedtls_ssl_session *session ) -{ - int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; - - if( ssl == NULL || - session == NULL || - ssl->session_negotiate == NULL || - ssl->conf->endpoint != MBEDTLS_SSL_IS_CLIENT ) - { - return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); - } - - if( ( ret = mbedtls_ssl_session_copy( ssl->session_negotiate, - session ) ) != 0 ) - return( ret ); - - ssl->handshake->resume = 1; - - return( 0 ); -} -#endif /* MBEDTLS_SSL_CLI_C */ - -void mbedtls_ssl_conf_ciphersuites( mbedtls_ssl_config *conf, - const int *ciphersuites ) -{ - conf->ciphersuite_list[MBEDTLS_SSL_MINOR_VERSION_0] = ciphersuites; - conf->ciphersuite_list[MBEDTLS_SSL_MINOR_VERSION_1] = ciphersuites; - conf->ciphersuite_list[MBEDTLS_SSL_MINOR_VERSION_2] = ciphersuites; - conf->ciphersuite_list[MBEDTLS_SSL_MINOR_VERSION_3] = ciphersuites; -} - -void mbedtls_ssl_conf_ciphersuites_for_version( mbedtls_ssl_config *conf, - const int *ciphersuites, - int major, int minor ) -{ - if( major != MBEDTLS_SSL_MAJOR_VERSION_3 ) - return; - - if( minor < MBEDTLS_SSL_MINOR_VERSION_0 || minor > MBEDTLS_SSL_MINOR_VERSION_3 ) - return; - - conf->ciphersuite_list[minor] = ciphersuites; -} - -#if defined(MBEDTLS_X509_CRT_PARSE_C) -void mbedtls_ssl_conf_cert_profile( mbedtls_ssl_config *conf, - const mbedtls_x509_crt_profile *profile ) -{ - conf->cert_profile = profile; -} - -/* Append a new keycert entry to a (possibly empty) list */ -static int ssl_append_key_cert( mbedtls_ssl_key_cert **head, - mbedtls_x509_crt *cert, - mbedtls_pk_context *key ) -{ - mbedtls_ssl_key_cert *new_cert; - - new_cert = mbedtls_calloc( 1, sizeof( mbedtls_ssl_key_cert ) ); - if( new_cert == NULL ) - return( MBEDTLS_ERR_SSL_ALLOC_FAILED ); - - new_cert->cert = cert; - new_cert->key = key; - new_cert->next = NULL; - - /* Update head is the list was null, else add to the end */ - if( *head == NULL ) - { - *head = new_cert; - } - else - { - mbedtls_ssl_key_cert *cur = *head; - while( cur->next != NULL ) - cur = cur->next; - cur->next = new_cert; - } - - return( 0 ); -} - -int mbedtls_ssl_conf_own_cert( mbedtls_ssl_config *conf, - mbedtls_x509_crt *own_cert, - mbedtls_pk_context *pk_key ) -{ - return( ssl_append_key_cert( &conf->key_cert, own_cert, pk_key ) ); -} - -void mbedtls_ssl_conf_ca_chain( mbedtls_ssl_config *conf, - mbedtls_x509_crt *ca_chain, - mbedtls_x509_crl *ca_crl ) -{ - conf->ca_chain = ca_chain; - conf->ca_crl = ca_crl; - -#if defined(MBEDTLS_X509_TRUSTED_CERTIFICATE_CALLBACK) - /* mbedtls_ssl_conf_ca_chain() and mbedtls_ssl_conf_ca_cb() - * cannot be used together. */ - conf->f_ca_cb = NULL; - conf->p_ca_cb = NULL; -#endif /* MBEDTLS_X509_TRUSTED_CERTIFICATE_CALLBACK */ -} - -#if defined(MBEDTLS_X509_TRUSTED_CERTIFICATE_CALLBACK) -void mbedtls_ssl_conf_ca_cb( mbedtls_ssl_config *conf, - mbedtls_x509_crt_ca_cb_t f_ca_cb, - void *p_ca_cb ) -{ - conf->f_ca_cb = f_ca_cb; - conf->p_ca_cb = p_ca_cb; - - /* mbedtls_ssl_conf_ca_chain() and mbedtls_ssl_conf_ca_cb() - * cannot be used together. */ - conf->ca_chain = NULL; - conf->ca_crl = NULL; -} -#endif /* MBEDTLS_X509_TRUSTED_CERTIFICATE_CALLBACK */ -#endif /* MBEDTLS_X509_CRT_PARSE_C */ - -#if defined(MBEDTLS_SSL_SERVER_NAME_INDICATION) -int mbedtls_ssl_set_hs_own_cert( mbedtls_ssl_context *ssl, - mbedtls_x509_crt *own_cert, - mbedtls_pk_context *pk_key ) -{ - return( ssl_append_key_cert( &ssl->handshake->sni_key_cert, - own_cert, pk_key ) ); -} - -void mbedtls_ssl_set_hs_ca_chain( mbedtls_ssl_context *ssl, - mbedtls_x509_crt *ca_chain, - mbedtls_x509_crl *ca_crl ) -{ - ssl->handshake->sni_ca_chain = ca_chain; - ssl->handshake->sni_ca_crl = ca_crl; -} - -void mbedtls_ssl_set_hs_authmode( mbedtls_ssl_context *ssl, - int authmode ) -{ - ssl->handshake->sni_authmode = authmode; -} -#endif /* MBEDTLS_SSL_SERVER_NAME_INDICATION */ - -#if defined(MBEDTLS_X509_CRT_PARSE_C) -void mbedtls_ssl_set_verify( mbedtls_ssl_context *ssl, - int (*f_vrfy)(void *, mbedtls_x509_crt *, int, uint32_t *), - void *p_vrfy ) -{ - ssl->f_vrfy = f_vrfy; - ssl->p_vrfy = p_vrfy; -} -#endif - -#if defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED) -/* - * Set EC J-PAKE password for current handshake - */ -int mbedtls_ssl_set_hs_ecjpake_password( mbedtls_ssl_context *ssl, - const unsigned char *pw, - size_t pw_len ) -{ - mbedtls_ecjpake_role role; - - if( ssl->handshake == NULL || ssl->conf == NULL ) - return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); - - if( ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER ) - role = MBEDTLS_ECJPAKE_SERVER; - else - role = MBEDTLS_ECJPAKE_CLIENT; - - return( mbedtls_ecjpake_setup( &ssl->handshake->ecjpake_ctx, - role, - MBEDTLS_MD_SHA256, - MBEDTLS_ECP_DP_SECP256R1, - pw, pw_len ) ); -} -#endif /* MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED */ - -#if defined(MBEDTLS_KEY_EXCHANGE__SOME__PSK_ENABLED) - -static void ssl_conf_remove_psk( mbedtls_ssl_config *conf ) -{ - /* Remove reference to existing PSK, if any. */ -#if defined(MBEDTLS_USE_PSA_CRYPTO) - if( conf->psk_opaque != 0 ) - { - /* The maintenance of the PSK key slot is the - * user's responsibility. */ - conf->psk_opaque = 0; - } - /* This and the following branch should never - * be taken simultaenously as we maintain the - * invariant that raw and opaque PSKs are never - * configured simultaneously. As a safeguard, - * though, `else` is omitted here. */ -#endif /* MBEDTLS_USE_PSA_CRYPTO */ - if( conf->psk != NULL ) - { - mbedtls_platform_zeroize( conf->psk, conf->psk_len ); - - mbedtls_free( conf->psk ); - conf->psk = NULL; - conf->psk_len = 0; - } - - /* Remove reference to PSK identity, if any. */ - if( conf->psk_identity != NULL ) - { - mbedtls_free( conf->psk_identity ); - conf->psk_identity = NULL; - conf->psk_identity_len = 0; - } -} - -/* This function assumes that PSK identity in the SSL config is unset. - * It checks that the provided identity is well-formed and attempts - * to make a copy of it in the SSL config. - * On failure, the PSK identity in the config remains unset. */ -static int ssl_conf_set_psk_identity( mbedtls_ssl_config *conf, - unsigned char const *psk_identity, - size_t psk_identity_len ) -{ - /* Identity len will be encoded on two bytes */ - if( psk_identity == NULL || - ( psk_identity_len >> 16 ) != 0 || - psk_identity_len > MBEDTLS_SSL_OUT_CONTENT_LEN ) - { - return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); - } - - conf->psk_identity = mbedtls_calloc( 1, psk_identity_len ); - if( conf->psk_identity == NULL ) - return( MBEDTLS_ERR_SSL_ALLOC_FAILED ); - - conf->psk_identity_len = psk_identity_len; - memcpy( conf->psk_identity, psk_identity, conf->psk_identity_len ); - - return( 0 ); -} - -int mbedtls_ssl_conf_psk( mbedtls_ssl_config *conf, - const unsigned char *psk, size_t psk_len, - const unsigned char *psk_identity, size_t psk_identity_len ) -{ - int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; - /* Remove opaque/raw PSK + PSK Identity */ - ssl_conf_remove_psk( conf ); - - /* Check and set raw PSK */ - if( psk == NULL ) - return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); - if( psk_len == 0 ) - return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); - if( psk_len > MBEDTLS_PSK_MAX_LEN ) - return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); - - if( ( conf->psk = mbedtls_calloc( 1, psk_len ) ) == NULL ) - return( MBEDTLS_ERR_SSL_ALLOC_FAILED ); - conf->psk_len = psk_len; - memcpy( conf->psk, psk, conf->psk_len ); - - /* Check and set PSK Identity */ - ret = ssl_conf_set_psk_identity( conf, psk_identity, psk_identity_len ); - if( ret != 0 ) - ssl_conf_remove_psk( conf ); - - return( ret ); -} - -static void ssl_remove_psk( mbedtls_ssl_context *ssl ) -{ -#if defined(MBEDTLS_USE_PSA_CRYPTO) - if( ssl->handshake->psk_opaque != 0 ) - { - ssl->handshake->psk_opaque = 0; - } - else -#endif /* MBEDTLS_USE_PSA_CRYPTO */ - if( ssl->handshake->psk != NULL ) - { - mbedtls_platform_zeroize( ssl->handshake->psk, - ssl->handshake->psk_len ); - mbedtls_free( ssl->handshake->psk ); - ssl->handshake->psk_len = 0; - } -} - -int mbedtls_ssl_set_hs_psk( mbedtls_ssl_context *ssl, - const unsigned char *psk, size_t psk_len ) -{ - if( psk == NULL || ssl->handshake == NULL ) - return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); - - if( psk_len > MBEDTLS_PSK_MAX_LEN ) - return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); - - ssl_remove_psk( ssl ); - - if( ( ssl->handshake->psk = mbedtls_calloc( 1, psk_len ) ) == NULL ) - return( MBEDTLS_ERR_SSL_ALLOC_FAILED ); - - ssl->handshake->psk_len = psk_len; - memcpy( ssl->handshake->psk, psk, ssl->handshake->psk_len ); - - return( 0 ); -} - -#if defined(MBEDTLS_USE_PSA_CRYPTO) -int mbedtls_ssl_conf_psk_opaque( mbedtls_ssl_config *conf, - psa_key_handle_t psk_slot, - const unsigned char *psk_identity, - size_t psk_identity_len ) -{ - int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; - /* Clear opaque/raw PSK + PSK Identity, if present. */ - ssl_conf_remove_psk( conf ); - - /* Check and set opaque PSK */ - if( psk_slot == 0 ) - return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); - conf->psk_opaque = psk_slot; - - /* Check and set PSK Identity */ - ret = ssl_conf_set_psk_identity( conf, psk_identity, - psk_identity_len ); - if( ret != 0 ) - ssl_conf_remove_psk( conf ); - - return( ret ); -} - -int mbedtls_ssl_set_hs_psk_opaque( mbedtls_ssl_context *ssl, - psa_key_handle_t psk_slot ) -{ - if( psk_slot == 0 || ssl->handshake == NULL ) - return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); - - ssl_remove_psk( ssl ); - ssl->handshake->psk_opaque = psk_slot; - return( 0 ); -} -#endif /* MBEDTLS_USE_PSA_CRYPTO */ - -void mbedtls_ssl_conf_psk_cb( mbedtls_ssl_config *conf, - int (*f_psk)(void *, mbedtls_ssl_context *, const unsigned char *, - size_t), - void *p_psk ) -{ - conf->f_psk = f_psk; - conf->p_psk = p_psk; -} -#endif /* MBEDTLS_KEY_EXCHANGE__SOME__PSK_ENABLED */ - -#if defined(MBEDTLS_DHM_C) && defined(MBEDTLS_SSL_SRV_C) - -#if !defined(MBEDTLS_DEPRECATED_REMOVED) -int mbedtls_ssl_conf_dh_param( mbedtls_ssl_config *conf, const char *dhm_P, const char *dhm_G ) -{ - int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; - - if( ( ret = mbedtls_mpi_read_string( &conf->dhm_P, 16, dhm_P ) ) != 0 || - ( ret = mbedtls_mpi_read_string( &conf->dhm_G, 16, dhm_G ) ) != 0 ) - { - mbedtls_mpi_free( &conf->dhm_P ); - mbedtls_mpi_free( &conf->dhm_G ); - return( ret ); - } - - return( 0 ); -} -#endif /* MBEDTLS_DEPRECATED_REMOVED */ - -int mbedtls_ssl_conf_dh_param_bin( mbedtls_ssl_config *conf, - const unsigned char *dhm_P, size_t P_len, - const unsigned char *dhm_G, size_t G_len ) -{ - int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; - - if( ( ret = mbedtls_mpi_read_binary( &conf->dhm_P, dhm_P, P_len ) ) != 0 || - ( ret = mbedtls_mpi_read_binary( &conf->dhm_G, dhm_G, G_len ) ) != 0 ) - { - mbedtls_mpi_free( &conf->dhm_P ); - mbedtls_mpi_free( &conf->dhm_G ); - return( ret ); - } - - return( 0 ); -} - -int mbedtls_ssl_conf_dh_param_ctx( mbedtls_ssl_config *conf, mbedtls_dhm_context *dhm_ctx ) -{ - int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; - - if( ( ret = mbedtls_mpi_copy( &conf->dhm_P, &dhm_ctx->P ) ) != 0 || - ( ret = mbedtls_mpi_copy( &conf->dhm_G, &dhm_ctx->G ) ) != 0 ) - { - mbedtls_mpi_free( &conf->dhm_P ); - mbedtls_mpi_free( &conf->dhm_G ); - return( ret ); - } - - return( 0 ); -} -#endif /* MBEDTLS_DHM_C && MBEDTLS_SSL_SRV_C */ - -#if defined(MBEDTLS_DHM_C) && defined(MBEDTLS_SSL_CLI_C) -/* - * Set the minimum length for Diffie-Hellman parameters - */ -void mbedtls_ssl_conf_dhm_min_bitlen( mbedtls_ssl_config *conf, - unsigned int bitlen ) -{ - conf->dhm_min_bitlen = bitlen; -} -#endif /* MBEDTLS_DHM_C && MBEDTLS_SSL_CLI_C */ - -#if defined(MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED) -/* - * Set allowed/preferred hashes for handshake signatures - */ -void mbedtls_ssl_conf_sig_hashes( mbedtls_ssl_config *conf, - const int *hashes ) -{ - conf->sig_hashes = hashes; -} -#endif /* MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED */ - -#if defined(MBEDTLS_ECP_C) -/* - * Set the allowed elliptic curves - */ -void mbedtls_ssl_conf_curves( mbedtls_ssl_config *conf, - const mbedtls_ecp_group_id *curve_list ) -{ - conf->curve_list = curve_list; -} -#endif /* MBEDTLS_ECP_C */ - -#if defined(MBEDTLS_X509_CRT_PARSE_C) -int mbedtls_ssl_set_hostname( mbedtls_ssl_context *ssl, const char *hostname ) -{ - /* Initialize to suppress unnecessary compiler warning */ - size_t hostname_len = 0; - - /* Check if new hostname is valid before - * making any change to current one */ - if( hostname != NULL ) - { - hostname_len = strlen( hostname ); - - if( hostname_len > MBEDTLS_SSL_MAX_HOST_NAME_LEN ) - return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); - } - - /* Now it's clear that we will overwrite the old hostname, - * so we can free it safely */ - - if( ssl->hostname != NULL ) - { - mbedtls_platform_zeroize( ssl->hostname, strlen( ssl->hostname ) ); - mbedtls_free( ssl->hostname ); - } - - /* Passing NULL as hostname shall clear the old one */ - - if( hostname == NULL ) - { - ssl->hostname = NULL; - } - else - { - ssl->hostname = mbedtls_calloc( 1, hostname_len + 1 ); - if( ssl->hostname == NULL ) - return( MBEDTLS_ERR_SSL_ALLOC_FAILED ); - - memcpy( ssl->hostname, hostname, hostname_len ); - - ssl->hostname[hostname_len] = '\0'; - } - - return( 0 ); -} -#endif /* MBEDTLS_X509_CRT_PARSE_C */ - -#if defined(MBEDTLS_SSL_SERVER_NAME_INDICATION) -void mbedtls_ssl_conf_sni( mbedtls_ssl_config *conf, - int (*f_sni)(void *, mbedtls_ssl_context *, - const unsigned char *, size_t), - void *p_sni ) -{ - conf->f_sni = f_sni; - conf->p_sni = p_sni; -} -#endif /* MBEDTLS_SSL_SERVER_NAME_INDICATION */ - -#if defined(MBEDTLS_SSL_ALPN) -int mbedtls_ssl_conf_alpn_protocols( mbedtls_ssl_config *conf, const char **protos ) -{ - size_t cur_len, tot_len; - const char **p; - - /* - * RFC 7301 3.1: "Empty strings MUST NOT be included and byte strings - * MUST NOT be truncated." - * We check lengths now rather than later. - */ - tot_len = 0; - for( p = protos; *p != NULL; p++ ) - { - cur_len = strlen( *p ); - tot_len += cur_len; - - if( cur_len == 0 || cur_len > 255 || tot_len > 65535 ) - return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); - } - - conf->alpn_list = protos; - - return( 0 ); -} - -const char *mbedtls_ssl_get_alpn_protocol( const mbedtls_ssl_context *ssl ) -{ - return( ssl->alpn_chosen ); -} -#endif /* MBEDTLS_SSL_ALPN */ - -void mbedtls_ssl_conf_max_version( mbedtls_ssl_config *conf, int major, int minor ) -{ - conf->max_major_ver = major; - conf->max_minor_ver = minor; -} - -void mbedtls_ssl_conf_min_version( mbedtls_ssl_config *conf, int major, int minor ) -{ - conf->min_major_ver = major; - conf->min_minor_ver = minor; -} - -#if defined(MBEDTLS_SSL_FALLBACK_SCSV) && defined(MBEDTLS_SSL_CLI_C) -void mbedtls_ssl_conf_fallback( mbedtls_ssl_config *conf, char fallback ) -{ - conf->fallback = fallback; -} -#endif - -#if defined(MBEDTLS_SSL_SRV_C) -void mbedtls_ssl_conf_cert_req_ca_list( mbedtls_ssl_config *conf, - char cert_req_ca_list ) -{ - conf->cert_req_ca_list = cert_req_ca_list; -} -#endif - -#if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC) -void mbedtls_ssl_conf_encrypt_then_mac( mbedtls_ssl_config *conf, char etm ) -{ - conf->encrypt_then_mac = etm; -} -#endif - -#if defined(MBEDTLS_SSL_EXTENDED_MASTER_SECRET) -void mbedtls_ssl_conf_extended_master_secret( mbedtls_ssl_config *conf, char ems ) -{ - conf->extended_ms = ems; -} -#endif - -#if defined(MBEDTLS_ARC4_C) -void mbedtls_ssl_conf_arc4_support( mbedtls_ssl_config *conf, char arc4 ) -{ - conf->arc4_disabled = arc4; -} -#endif - -#if defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH) -int mbedtls_ssl_conf_max_frag_len( mbedtls_ssl_config *conf, unsigned char mfl_code ) -{ - if( mfl_code >= MBEDTLS_SSL_MAX_FRAG_LEN_INVALID || - ssl_mfl_code_to_length( mfl_code ) > MBEDTLS_TLS_EXT_ADV_CONTENT_LEN ) - { - return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); - } - - conf->mfl_code = mfl_code; - - return( 0 ); -} -#endif /* MBEDTLS_SSL_MAX_FRAGMENT_LENGTH */ - -#if defined(MBEDTLS_SSL_TRUNCATED_HMAC) -void mbedtls_ssl_conf_truncated_hmac( mbedtls_ssl_config *conf, int truncate ) -{ - conf->trunc_hmac = truncate; -} -#endif /* MBEDTLS_SSL_TRUNCATED_HMAC */ - -#if defined(MBEDTLS_SSL_CBC_RECORD_SPLITTING) -void mbedtls_ssl_conf_cbc_record_splitting( mbedtls_ssl_config *conf, char split ) -{ - conf->cbc_record_splitting = split; -} -#endif - -void mbedtls_ssl_conf_legacy_renegotiation( mbedtls_ssl_config *conf, int allow_legacy ) -{ - conf->allow_legacy_renegotiation = allow_legacy; -} - -#if defined(MBEDTLS_SSL_RENEGOTIATION) -void mbedtls_ssl_conf_renegotiation( mbedtls_ssl_config *conf, int renegotiation ) -{ - conf->disable_renegotiation = renegotiation; -} - -void mbedtls_ssl_conf_renegotiation_enforced( mbedtls_ssl_config *conf, int max_records ) -{ - conf->renego_max_records = max_records; -} - -void mbedtls_ssl_conf_renegotiation_period( mbedtls_ssl_config *conf, - const unsigned char period[8] ) -{ - memcpy( conf->renego_period, period, 8 ); -} -#endif /* MBEDTLS_SSL_RENEGOTIATION */ - -#if defined(MBEDTLS_SSL_SESSION_TICKETS) -#if defined(MBEDTLS_SSL_CLI_C) -void mbedtls_ssl_conf_session_tickets( mbedtls_ssl_config *conf, int use_tickets ) -{ - conf->session_tickets = use_tickets; -} -#endif - -#if defined(MBEDTLS_SSL_SRV_C) -void mbedtls_ssl_conf_session_tickets_cb( mbedtls_ssl_config *conf, - mbedtls_ssl_ticket_write_t *f_ticket_write, - mbedtls_ssl_ticket_parse_t *f_ticket_parse, - void *p_ticket ) -{ - conf->f_ticket_write = f_ticket_write; - conf->f_ticket_parse = f_ticket_parse; - conf->p_ticket = p_ticket; -} -#endif -#endif /* MBEDTLS_SSL_SESSION_TICKETS */ - -#if defined(MBEDTLS_SSL_EXPORT_KEYS) -void mbedtls_ssl_conf_export_keys_cb( mbedtls_ssl_config *conf, - mbedtls_ssl_export_keys_t *f_export_keys, - void *p_export_keys ) -{ - conf->f_export_keys = f_export_keys; - conf->p_export_keys = p_export_keys; -} - -void mbedtls_ssl_conf_export_keys_ext_cb( mbedtls_ssl_config *conf, - mbedtls_ssl_export_keys_ext_t *f_export_keys_ext, - void *p_export_keys ) -{ - conf->f_export_keys_ext = f_export_keys_ext; - conf->p_export_keys = p_export_keys; -} -#endif - -#if defined(MBEDTLS_SSL_ASYNC_PRIVATE) -void mbedtls_ssl_conf_async_private_cb( - mbedtls_ssl_config *conf, - mbedtls_ssl_async_sign_t *f_async_sign, - mbedtls_ssl_async_decrypt_t *f_async_decrypt, - mbedtls_ssl_async_resume_t *f_async_resume, - mbedtls_ssl_async_cancel_t *f_async_cancel, - void *async_config_data ) -{ - conf->f_async_sign_start = f_async_sign; - conf->f_async_decrypt_start = f_async_decrypt; - conf->f_async_resume = f_async_resume; - conf->f_async_cancel = f_async_cancel; - conf->p_async_config_data = async_config_data; -} - -void *mbedtls_ssl_conf_get_async_config_data( const mbedtls_ssl_config *conf ) -{ - return( conf->p_async_config_data ); -} - -void *mbedtls_ssl_get_async_operation_data( const mbedtls_ssl_context *ssl ) -{ - if( ssl->handshake == NULL ) - return( NULL ); - else - return( ssl->handshake->user_async_ctx ); -} - -void mbedtls_ssl_set_async_operation_data( mbedtls_ssl_context *ssl, - void *ctx ) -{ - if( ssl->handshake != NULL ) - ssl->handshake->user_async_ctx = ctx; -} -#endif /* MBEDTLS_SSL_ASYNC_PRIVATE */ - -uint32_t mbedtls_ssl_get_verify_result( const mbedtls_ssl_context *ssl ) -{ - if( ssl->session != NULL ) - return( ssl->session->verify_result ); - - if( ssl->session_negotiate != NULL ) - return( ssl->session_negotiate->verify_result ); - - return( 0xFFFFFFFF ); -} - -const char *mbedtls_ssl_get_ciphersuite( const mbedtls_ssl_context *ssl ) -{ - if( ssl == NULL || ssl->session == NULL ) - return( NULL ); - - return mbedtls_ssl_get_ciphersuite_name( ssl->session->ciphersuite ); -} - -const char *mbedtls_ssl_get_version( const mbedtls_ssl_context *ssl ) -{ -#if defined(MBEDTLS_SSL_PROTO_DTLS) - if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM ) - { - switch( ssl->minor_ver ) - { - case MBEDTLS_SSL_MINOR_VERSION_2: - return( "DTLSv1.0" ); - - case MBEDTLS_SSL_MINOR_VERSION_3: - return( "DTLSv1.2" ); - - default: - return( "unknown (DTLS)" ); - } - } -#endif - - switch( ssl->minor_ver ) - { - case MBEDTLS_SSL_MINOR_VERSION_0: - return( "SSLv3.0" ); - - case MBEDTLS_SSL_MINOR_VERSION_1: - return( "TLSv1.0" ); - - case MBEDTLS_SSL_MINOR_VERSION_2: - return( "TLSv1.1" ); - - case MBEDTLS_SSL_MINOR_VERSION_3: - return( "TLSv1.2" ); - - default: - return( "unknown" ); - } -} - -#if defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH) -size_t mbedtls_ssl_get_max_frag_len( const mbedtls_ssl_context *ssl ) -{ - size_t max_len; - - /* - * Assume mfl_code is correct since it was checked when set - */ - max_len = ssl_mfl_code_to_length( ssl->conf->mfl_code ); - - /* Check if a smaller max length was negotiated */ - if( ssl->session_out != NULL && - ssl_mfl_code_to_length( ssl->session_out->mfl_code ) < max_len ) - { - max_len = ssl_mfl_code_to_length( ssl->session_out->mfl_code ); - } - - /* During a handshake, use the value being negotiated */ - if( ssl->session_negotiate != NULL && - ssl_mfl_code_to_length( ssl->session_negotiate->mfl_code ) < max_len ) - { - max_len = ssl_mfl_code_to_length( ssl->session_negotiate->mfl_code ); - } - - return( max_len ); -} -#endif /* MBEDTLS_SSL_MAX_FRAGMENT_LENGTH */ - -#if defined(MBEDTLS_SSL_PROTO_DTLS) -size_t mbedtls_ssl_get_current_mtu( const mbedtls_ssl_context *ssl ) -{ - /* Return unlimited mtu for client hello messages to avoid fragmentation. */ - if( ssl->conf->endpoint == MBEDTLS_SSL_IS_CLIENT && - ( ssl->state == MBEDTLS_SSL_CLIENT_HELLO || - ssl->state == MBEDTLS_SSL_SERVER_HELLO ) ) - return ( 0 ); - - if( ssl->handshake == NULL || ssl->handshake->mtu == 0 ) - return( ssl->mtu ); - - if( ssl->mtu == 0 ) - return( ssl->handshake->mtu ); - - return( ssl->mtu < ssl->handshake->mtu ? - ssl->mtu : ssl->handshake->mtu ); -} -#endif /* MBEDTLS_SSL_PROTO_DTLS */ - -int mbedtls_ssl_get_max_out_record_payload( const mbedtls_ssl_context *ssl ) -{ - size_t max_len = MBEDTLS_SSL_OUT_CONTENT_LEN; - -#if !defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH) && \ - !defined(MBEDTLS_SSL_PROTO_DTLS) - (void) ssl; -#endif - -#if defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH) - const size_t mfl = mbedtls_ssl_get_max_frag_len( ssl ); - - if( max_len > mfl ) - max_len = mfl; -#endif - -#if defined(MBEDTLS_SSL_PROTO_DTLS) - if( mbedtls_ssl_get_current_mtu( ssl ) != 0 ) - { - const size_t mtu = mbedtls_ssl_get_current_mtu( ssl ); - const int ret = mbedtls_ssl_get_record_expansion( ssl ); - const size_t overhead = (size_t) ret; - - if( ret < 0 ) - return( ret ); - - if( mtu <= overhead ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "MTU too low for record expansion" ) ); - return( MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE ); - } - - if( max_len > mtu - overhead ) - max_len = mtu - overhead; - } -#endif /* MBEDTLS_SSL_PROTO_DTLS */ - -#if !defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH) && \ - !defined(MBEDTLS_SSL_PROTO_DTLS) - ((void) ssl); -#endif - - return( (int) max_len ); -} - -#if defined(MBEDTLS_X509_CRT_PARSE_C) -const mbedtls_x509_crt *mbedtls_ssl_get_peer_cert( const mbedtls_ssl_context *ssl ) -{ - if( ssl == NULL || ssl->session == NULL ) - return( NULL ); - -#if defined(MBEDTLS_SSL_KEEP_PEER_CERTIFICATE) - return( ssl->session->peer_cert ); -#else - return( NULL ); -#endif /* MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */ -} -#endif /* MBEDTLS_X509_CRT_PARSE_C */ - -#if defined(MBEDTLS_SSL_CLI_C) -int mbedtls_ssl_get_session( const mbedtls_ssl_context *ssl, - mbedtls_ssl_session *dst ) -{ - if( ssl == NULL || - dst == NULL || - ssl->session == NULL || - ssl->conf->endpoint != MBEDTLS_SSL_IS_CLIENT ) - { - return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); - } - - return( mbedtls_ssl_session_copy( dst, ssl->session ) ); -} -#endif /* MBEDTLS_SSL_CLI_C */ - -const mbedtls_ssl_session *mbedtls_ssl_get_session_pointer( const mbedtls_ssl_context *ssl ) -{ - if( ssl == NULL ) - return( NULL ); - - return( ssl->session ); -} - -/* - * Define ticket header determining Mbed TLS version - * and structure of the ticket. - */ - -/* - * Define bitflag determining compile-time settings influencing - * structure of serialized SSL sessions. - */ - -#if defined(MBEDTLS_HAVE_TIME) -#define SSL_SERIALIZED_SESSION_CONFIG_TIME 1 -#else -#define SSL_SERIALIZED_SESSION_CONFIG_TIME 0 -#endif /* MBEDTLS_HAVE_TIME */ - -#if defined(MBEDTLS_X509_CRT_PARSE_C) -#define SSL_SERIALIZED_SESSION_CONFIG_CRT 1 -#else -#define SSL_SERIALIZED_SESSION_CONFIG_CRT 0 -#endif /* MBEDTLS_X509_CRT_PARSE_C */ - -#if defined(MBEDTLS_SSL_CLI_C) && defined(MBEDTLS_SSL_SESSION_TICKETS) -#define SSL_SERIALIZED_SESSION_CONFIG_CLIENT_TICKET 1 -#else -#define SSL_SERIALIZED_SESSION_CONFIG_CLIENT_TICKET 0 -#endif /* MBEDTLS_SSL_CLI_C && MBEDTLS_SSL_SESSION_TICKETS */ - -#if defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH) -#define SSL_SERIALIZED_SESSION_CONFIG_MFL 1 -#else -#define SSL_SERIALIZED_SESSION_CONFIG_MFL 0 -#endif /* MBEDTLS_SSL_MAX_FRAGMENT_LENGTH */ - -#if defined(MBEDTLS_SSL_TRUNCATED_HMAC) -#define SSL_SERIALIZED_SESSION_CONFIG_TRUNC_HMAC 1 -#else -#define SSL_SERIALIZED_SESSION_CONFIG_TRUNC_HMAC 0 -#endif /* MBEDTLS_SSL_TRUNCATED_HMAC */ - -#if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC) -#define SSL_SERIALIZED_SESSION_CONFIG_ETM 1 -#else -#define SSL_SERIALIZED_SESSION_CONFIG_ETM 0 -#endif /* MBEDTLS_SSL_ENCRYPT_THEN_MAC */ - -#if defined(MBEDTLS_SSL_SESSION_TICKETS) -#define SSL_SERIALIZED_SESSION_CONFIG_TICKET 1 -#else -#define SSL_SERIALIZED_SESSION_CONFIG_TICKET 0 -#endif /* MBEDTLS_SSL_SESSION_TICKETS */ - -#define SSL_SERIALIZED_SESSION_CONFIG_TIME_BIT 0 -#define SSL_SERIALIZED_SESSION_CONFIG_CRT_BIT 1 -#define SSL_SERIALIZED_SESSION_CONFIG_CLIENT_TICKET_BIT 2 -#define SSL_SERIALIZED_SESSION_CONFIG_MFL_BIT 3 -#define SSL_SERIALIZED_SESSION_CONFIG_TRUNC_HMAC_BIT 4 -#define SSL_SERIALIZED_SESSION_CONFIG_ETM_BIT 5 -#define SSL_SERIALIZED_SESSION_CONFIG_TICKET_BIT 6 - -#define SSL_SERIALIZED_SESSION_CONFIG_BITFLAG \ - ( (uint16_t) ( \ - ( SSL_SERIALIZED_SESSION_CONFIG_TIME << SSL_SERIALIZED_SESSION_CONFIG_TIME_BIT ) | \ - ( SSL_SERIALIZED_SESSION_CONFIG_CRT << SSL_SERIALIZED_SESSION_CONFIG_CRT_BIT ) | \ - ( SSL_SERIALIZED_SESSION_CONFIG_CLIENT_TICKET << SSL_SERIALIZED_SESSION_CONFIG_CLIENT_TICKET_BIT ) | \ - ( SSL_SERIALIZED_SESSION_CONFIG_MFL << SSL_SERIALIZED_SESSION_CONFIG_MFL_BIT ) | \ - ( SSL_SERIALIZED_SESSION_CONFIG_TRUNC_HMAC << SSL_SERIALIZED_SESSION_CONFIG_TRUNC_HMAC_BIT ) | \ - ( SSL_SERIALIZED_SESSION_CONFIG_ETM << SSL_SERIALIZED_SESSION_CONFIG_ETM_BIT ) | \ - ( SSL_SERIALIZED_SESSION_CONFIG_TICKET << SSL_SERIALIZED_SESSION_CONFIG_TICKET_BIT ) ) ) - -static unsigned char ssl_serialized_session_header[] = { - MBEDTLS_VERSION_MAJOR, - MBEDTLS_VERSION_MINOR, - MBEDTLS_VERSION_PATCH, - ( SSL_SERIALIZED_SESSION_CONFIG_BITFLAG >> 8 ) & 0xFF, - ( SSL_SERIALIZED_SESSION_CONFIG_BITFLAG >> 0 ) & 0xFF, -}; - -/* - * Serialize a session in the following format: - * (in the presentation language of TLS, RFC 8446 section 3) - * - * opaque mbedtls_version[3]; // major, minor, patch - * opaque session_format[2]; // version-specific 16-bit field determining - * // the format of the remaining - * // serialized data. - * - * Note: When updating the format, remember to keep - * these version+format bytes. - * - * // In this version, `session_format` determines - * // the setting of those compile-time - * // configuration options which influence - * // the structure of mbedtls_ssl_session. - * uint64 start_time; - * uint8 ciphersuite[2]; // defined by the standard - * uint8 compression; // 0 or 1 - * uint8 session_id_len; // at most 32 - * opaque session_id[32]; - * opaque master[48]; // fixed length in the standard - * uint32 verify_result; - * opaque peer_cert<0..2^24-1>; // length 0 means no peer cert - * opaque ticket<0..2^24-1>; // length 0 means no ticket - * uint32 ticket_lifetime; - * uint8 mfl_code; // up to 255 according to standard - * uint8 trunc_hmac; // 0 or 1 - * uint8 encrypt_then_mac; // 0 or 1 - * - * The order is the same as in the definition of the structure, except - * verify_result is put before peer_cert so that all mandatory fields come - * together in one block. - */ -static int ssl_session_save( const mbedtls_ssl_session *session, - unsigned char omit_header, - unsigned char *buf, - size_t buf_len, - size_t *olen ) -{ - unsigned char *p = buf; - size_t used = 0; -#if defined(MBEDTLS_HAVE_TIME) - uint64_t start; -#endif -#if defined(MBEDTLS_X509_CRT_PARSE_C) -#if defined(MBEDTLS_SSL_KEEP_PEER_CERTIFICATE) - size_t cert_len; -#endif /* MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */ -#endif /* MBEDTLS_X509_CRT_PARSE_C */ - - - if( !omit_header ) - { - /* - * Add version identifier - */ - - used += sizeof( ssl_serialized_session_header ); - - if( used <= buf_len ) - { - memcpy( p, ssl_serialized_session_header, - sizeof( ssl_serialized_session_header ) ); - p += sizeof( ssl_serialized_session_header ); - } - } - - /* - * Time - */ -#if defined(MBEDTLS_HAVE_TIME) - used += 8; - - if( used <= buf_len ) - { - start = (uint64_t) session->start; - - *p++ = (unsigned char)( ( start >> 56 ) & 0xFF ); - *p++ = (unsigned char)( ( start >> 48 ) & 0xFF ); - *p++ = (unsigned char)( ( start >> 40 ) & 0xFF ); - *p++ = (unsigned char)( ( start >> 32 ) & 0xFF ); - *p++ = (unsigned char)( ( start >> 24 ) & 0xFF ); - *p++ = (unsigned char)( ( start >> 16 ) & 0xFF ); - *p++ = (unsigned char)( ( start >> 8 ) & 0xFF ); - *p++ = (unsigned char)( ( start ) & 0xFF ); - } -#endif /* MBEDTLS_HAVE_TIME */ - - /* - * Basic mandatory fields - */ - used += 2 /* ciphersuite */ - + 1 /* compression */ - + 1 /* id_len */ - + sizeof( session->id ) - + sizeof( session->master ) - + 4; /* verify_result */ - - if( used <= buf_len ) - { - *p++ = (unsigned char)( ( session->ciphersuite >> 8 ) & 0xFF ); - *p++ = (unsigned char)( ( session->ciphersuite ) & 0xFF ); - - *p++ = (unsigned char)( session->compression & 0xFF ); - - *p++ = (unsigned char)( session->id_len & 0xFF ); - memcpy( p, session->id, 32 ); - p += 32; - - memcpy( p, session->master, 48 ); - p += 48; - - *p++ = (unsigned char)( ( session->verify_result >> 24 ) & 0xFF ); - *p++ = (unsigned char)( ( session->verify_result >> 16 ) & 0xFF ); - *p++ = (unsigned char)( ( session->verify_result >> 8 ) & 0xFF ); - *p++ = (unsigned char)( ( session->verify_result ) & 0xFF ); - } - - /* - * Peer's end-entity certificate - */ -#if defined(MBEDTLS_X509_CRT_PARSE_C) -#if defined(MBEDTLS_SSL_KEEP_PEER_CERTIFICATE) - if( session->peer_cert == NULL ) - cert_len = 0; - else - cert_len = session->peer_cert->raw.len; - - used += 3 + cert_len; - - if( used <= buf_len ) - { - *p++ = (unsigned char)( ( cert_len >> 16 ) & 0xFF ); - *p++ = (unsigned char)( ( cert_len >> 8 ) & 0xFF ); - *p++ = (unsigned char)( ( cert_len ) & 0xFF ); - - if( session->peer_cert != NULL ) - { - memcpy( p, session->peer_cert->raw.p, cert_len ); - p += cert_len; - } - } -#else /* MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */ - if( session->peer_cert_digest != NULL ) - { - used += 1 /* type */ + 1 /* length */ + session->peer_cert_digest_len; - if( used <= buf_len ) - { - *p++ = (unsigned char) session->peer_cert_digest_type; - *p++ = (unsigned char) session->peer_cert_digest_len; - memcpy( p, session->peer_cert_digest, - session->peer_cert_digest_len ); - p += session->peer_cert_digest_len; - } - } - else - { - used += 2; - if( used <= buf_len ) - { - *p++ = (unsigned char) MBEDTLS_MD_NONE; - *p++ = 0; - } - } -#endif /* !MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */ -#endif /* MBEDTLS_X509_CRT_PARSE_C */ - - /* - * Session ticket if any, plus associated data - */ -#if defined(MBEDTLS_SSL_SESSION_TICKETS) && defined(MBEDTLS_SSL_CLI_C) - used += 3 + session->ticket_len + 4; /* len + ticket + lifetime */ - - if( used <= buf_len ) - { - *p++ = (unsigned char)( ( session->ticket_len >> 16 ) & 0xFF ); - *p++ = (unsigned char)( ( session->ticket_len >> 8 ) & 0xFF ); - *p++ = (unsigned char)( ( session->ticket_len ) & 0xFF ); - - if( session->ticket != NULL ) - { - memcpy( p, session->ticket, session->ticket_len ); - p += session->ticket_len; - } - - *p++ = (unsigned char)( ( session->ticket_lifetime >> 24 ) & 0xFF ); - *p++ = (unsigned char)( ( session->ticket_lifetime >> 16 ) & 0xFF ); - *p++ = (unsigned char)( ( session->ticket_lifetime >> 8 ) & 0xFF ); - *p++ = (unsigned char)( ( session->ticket_lifetime ) & 0xFF ); - } -#endif /* MBEDTLS_SSL_SESSION_TICKETS && MBEDTLS_SSL_CLI_C */ - - /* - * Misc extension-related info - */ -#if defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH) - used += 1; - - if( used <= buf_len ) - *p++ = session->mfl_code; -#endif - -#if defined(MBEDTLS_SSL_TRUNCATED_HMAC) - used += 1; - - if( used <= buf_len ) - *p++ = (unsigned char)( ( session->trunc_hmac ) & 0xFF ); -#endif - -#if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC) - used += 1; - - if( used <= buf_len ) - *p++ = (unsigned char)( ( session->encrypt_then_mac ) & 0xFF ); -#endif - - /* Done */ - *olen = used; - - if( used > buf_len ) - return( MBEDTLS_ERR_SSL_BUFFER_TOO_SMALL ); - - return( 0 ); -} - -/* - * Public wrapper for ssl_session_save() - */ -int mbedtls_ssl_session_save( const mbedtls_ssl_session *session, - unsigned char *buf, - size_t buf_len, - size_t *olen ) -{ - return( ssl_session_save( session, 0, buf, buf_len, olen ) ); -} - -/* - * Deserialize session, see mbedtls_ssl_session_save() for format. - * - * This internal version is wrapped by a public function that cleans up in - * case of error, and has an extra option omit_header. - */ -static int ssl_session_load( mbedtls_ssl_session *session, - unsigned char omit_header, - const unsigned char *buf, - size_t len ) -{ - const unsigned char *p = buf; - const unsigned char * const end = buf + len; -#if defined(MBEDTLS_HAVE_TIME) - uint64_t start; -#endif -#if defined(MBEDTLS_X509_CRT_PARSE_C) -#if defined(MBEDTLS_SSL_KEEP_PEER_CERTIFICATE) - size_t cert_len; -#endif /* MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */ -#endif /* MBEDTLS_X509_CRT_PARSE_C */ - - if( !omit_header ) - { - /* - * Check version identifier - */ - - if( (size_t)( end - p ) < sizeof( ssl_serialized_session_header ) ) - return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); - - if( memcmp( p, ssl_serialized_session_header, - sizeof( ssl_serialized_session_header ) ) != 0 ) - { - return( MBEDTLS_ERR_SSL_VERSION_MISMATCH ); - } - p += sizeof( ssl_serialized_session_header ); - } - - /* - * Time - */ -#if defined(MBEDTLS_HAVE_TIME) - if( 8 > (size_t)( end - p ) ) - return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); - - start = ( (uint64_t) p[0] << 56 ) | - ( (uint64_t) p[1] << 48 ) | - ( (uint64_t) p[2] << 40 ) | - ( (uint64_t) p[3] << 32 ) | - ( (uint64_t) p[4] << 24 ) | - ( (uint64_t) p[5] << 16 ) | - ( (uint64_t) p[6] << 8 ) | - ( (uint64_t) p[7] ); - p += 8; - - session->start = (time_t) start; -#endif /* MBEDTLS_HAVE_TIME */ - - /* - * Basic mandatory fields - */ - if( 2 + 1 + 1 + 32 + 48 + 4 > (size_t)( end - p ) ) - return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); - - session->ciphersuite = ( p[0] << 8 ) | p[1]; - p += 2; - - session->compression = *p++; - - session->id_len = *p++; - memcpy( session->id, p, 32 ); - p += 32; - - memcpy( session->master, p, 48 ); - p += 48; - - session->verify_result = ( (uint32_t) p[0] << 24 ) | - ( (uint32_t) p[1] << 16 ) | - ( (uint32_t) p[2] << 8 ) | - ( (uint32_t) p[3] ); - p += 4; - - /* Immediately clear invalid pointer values that have been read, in case - * we exit early before we replaced them with valid ones. */ -#if defined(MBEDTLS_X509_CRT_PARSE_C) -#if defined(MBEDTLS_SSL_KEEP_PEER_CERTIFICATE) - session->peer_cert = NULL; -#else - session->peer_cert_digest = NULL; -#endif /* !MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */ -#endif /* MBEDTLS_X509_CRT_PARSE_C */ -#if defined(MBEDTLS_SSL_SESSION_TICKETS) && defined(MBEDTLS_SSL_CLI_C) - session->ticket = NULL; -#endif /* MBEDTLS_SSL_SESSION_TICKETS && MBEDTLS_SSL_CLI_C */ - - /* - * Peer certificate - */ -#if defined(MBEDTLS_X509_CRT_PARSE_C) -#if defined(MBEDTLS_SSL_KEEP_PEER_CERTIFICATE) - /* Deserialize CRT from the end of the ticket. */ - if( 3 > (size_t)( end - p ) ) - return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); - - cert_len = ( p[0] << 16 ) | ( p[1] << 8 ) | p[2]; - p += 3; - - if( cert_len != 0 ) - { - int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; - - if( cert_len > (size_t)( end - p ) ) - return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); - - session->peer_cert = mbedtls_calloc( 1, sizeof( mbedtls_x509_crt ) ); - - if( session->peer_cert == NULL ) - return( MBEDTLS_ERR_SSL_ALLOC_FAILED ); - - mbedtls_x509_crt_init( session->peer_cert ); - - if( ( ret = mbedtls_x509_crt_parse_der( session->peer_cert, - p, cert_len ) ) != 0 ) - { - mbedtls_x509_crt_free( session->peer_cert ); - mbedtls_free( session->peer_cert ); - session->peer_cert = NULL; - return( ret ); - } - - p += cert_len; - } -#else /* MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */ - /* Deserialize CRT digest from the end of the ticket. */ - if( 2 > (size_t)( end - p ) ) - return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); - - session->peer_cert_digest_type = (mbedtls_md_type_t) *p++; - session->peer_cert_digest_len = (size_t) *p++; - - if( session->peer_cert_digest_len != 0 ) - { - const mbedtls_md_info_t *md_info = - mbedtls_md_info_from_type( session->peer_cert_digest_type ); - if( md_info == NULL ) - return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); - if( session->peer_cert_digest_len != mbedtls_md_get_size( md_info ) ) - return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); - - if( session->peer_cert_digest_len > (size_t)( end - p ) ) - return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); - - session->peer_cert_digest = - mbedtls_calloc( 1, session->peer_cert_digest_len ); - if( session->peer_cert_digest == NULL ) - return( MBEDTLS_ERR_SSL_ALLOC_FAILED ); - - memcpy( session->peer_cert_digest, p, - session->peer_cert_digest_len ); - p += session->peer_cert_digest_len; - } -#endif /* MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */ -#endif /* MBEDTLS_X509_CRT_PARSE_C */ - - /* - * Session ticket and associated data - */ -#if defined(MBEDTLS_SSL_SESSION_TICKETS) && defined(MBEDTLS_SSL_CLI_C) - if( 3 > (size_t)( end - p ) ) - return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); - - session->ticket_len = ( p[0] << 16 ) | ( p[1] << 8 ) | p[2]; - p += 3; - - if( session->ticket_len != 0 ) - { - if( session->ticket_len > (size_t)( end - p ) ) - return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); - - session->ticket = mbedtls_calloc( 1, session->ticket_len ); - if( session->ticket == NULL ) - return( MBEDTLS_ERR_SSL_ALLOC_FAILED ); - - memcpy( session->ticket, p, session->ticket_len ); - p += session->ticket_len; - } - - if( 4 > (size_t)( end - p ) ) - return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); - - session->ticket_lifetime = ( (uint32_t) p[0] << 24 ) | - ( (uint32_t) p[1] << 16 ) | - ( (uint32_t) p[2] << 8 ) | - ( (uint32_t) p[3] ); - p += 4; -#endif /* MBEDTLS_SSL_SESSION_TICKETS && MBEDTLS_SSL_CLI_C */ - - /* - * Misc extension-related info - */ -#if defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH) - if( 1 > (size_t)( end - p ) ) - return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); - - session->mfl_code = *p++; -#endif - -#if defined(MBEDTLS_SSL_TRUNCATED_HMAC) - if( 1 > (size_t)( end - p ) ) - return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); - - session->trunc_hmac = *p++; -#endif - -#if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC) - if( 1 > (size_t)( end - p ) ) - return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); - - session->encrypt_then_mac = *p++; -#endif - - /* Done, should have consumed entire buffer */ - if( p != end ) - return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); - - return( 0 ); -} - -/* - * Deserialize session: public wrapper for error cleaning - */ -int mbedtls_ssl_session_load( mbedtls_ssl_session *session, - const unsigned char *buf, - size_t len ) -{ - int ret = ssl_session_load( session, 0, buf, len ); - - if( ret != 0 ) - mbedtls_ssl_session_free( session ); - - return( ret ); -} - -/* - * Perform a single step of the SSL handshake - */ -int mbedtls_ssl_handshake_step( mbedtls_ssl_context *ssl ) -{ - int ret = MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE; - - if( ssl == NULL || ssl->conf == NULL ) - return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); - -#if defined(MBEDTLS_SSL_CLI_C) - if( ssl->conf->endpoint == MBEDTLS_SSL_IS_CLIENT ) - ret = mbedtls_ssl_handshake_client_step( ssl ); -#endif -#if defined(MBEDTLS_SSL_SRV_C) - if( ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER ) - ret = mbedtls_ssl_handshake_server_step( ssl ); -#endif - - return( ret ); -} - -/* - * Perform the SSL handshake - */ -int mbedtls_ssl_handshake( mbedtls_ssl_context *ssl ) -{ - int ret = 0; - - if( ssl == NULL || ssl->conf == NULL ) - return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> handshake" ) ); - - while( ssl->state != MBEDTLS_SSL_HANDSHAKE_OVER ) - { - ret = mbedtls_ssl_handshake_step( ssl ); - - if( ret != 0 ) - break; - } - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= handshake" ) ); - - return( ret ); -} - -#if defined(MBEDTLS_SSL_RENEGOTIATION) -#if defined(MBEDTLS_SSL_SRV_C) -/* - * Write HelloRequest to request renegotiation on server - */ -static int ssl_write_hello_request( mbedtls_ssl_context *ssl ) -{ - int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> write hello request" ) ); - - ssl->out_msglen = 4; - ssl->out_msgtype = MBEDTLS_SSL_MSG_HANDSHAKE; - ssl->out_msg[0] = MBEDTLS_SSL_HS_HELLO_REQUEST; - - if( ( ret = mbedtls_ssl_write_handshake_msg( ssl ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_write_handshake_msg", ret ); - return( ret ); - } - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= write hello request" ) ); - - return( 0 ); -} -#endif /* MBEDTLS_SSL_SRV_C */ - -/* - * Actually renegotiate current connection, triggered by either: - * - any side: calling mbedtls_ssl_renegotiate(), - * - client: receiving a HelloRequest during mbedtls_ssl_read(), - * - server: receiving any handshake message on server during mbedtls_ssl_read() after - * the initial handshake is completed. - * If the handshake doesn't complete due to waiting for I/O, it will continue - * during the next calls to mbedtls_ssl_renegotiate() or mbedtls_ssl_read() respectively. - */ -int mbedtls_ssl_start_renegotiation( mbedtls_ssl_context *ssl ) -{ - int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> renegotiate" ) ); - - if( ( ret = ssl_handshake_init( ssl ) ) != 0 ) - return( ret ); - - /* RFC 6347 4.2.2: "[...] the HelloRequest will have message_seq = 0 and - * the ServerHello will have message_seq = 1" */ -#if defined(MBEDTLS_SSL_PROTO_DTLS) - if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM && - ssl->renego_status == MBEDTLS_SSL_RENEGOTIATION_PENDING ) - { - if( ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER ) - ssl->handshake->out_msg_seq = 1; - else - ssl->handshake->in_msg_seq = 1; - } -#endif - - ssl->state = MBEDTLS_SSL_HELLO_REQUEST; - ssl->renego_status = MBEDTLS_SSL_RENEGOTIATION_IN_PROGRESS; - - if( ( ret = mbedtls_ssl_handshake( ssl ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_handshake", ret ); - return( ret ); - } - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= renegotiate" ) ); - - return( 0 ); -} - -/* - * Renegotiate current connection on client, - * or request renegotiation on server - */ -int mbedtls_ssl_renegotiate( mbedtls_ssl_context *ssl ) -{ - int ret = MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE; - - if( ssl == NULL || ssl->conf == NULL ) - return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); - -#if defined(MBEDTLS_SSL_SRV_C) - /* On server, just send the request */ - if( ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER ) - { - if( ssl->state != MBEDTLS_SSL_HANDSHAKE_OVER ) - return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); - - ssl->renego_status = MBEDTLS_SSL_RENEGOTIATION_PENDING; - - /* Did we already try/start sending HelloRequest? */ - if( ssl->out_left != 0 ) - return( mbedtls_ssl_flush_output( ssl ) ); - - return( ssl_write_hello_request( ssl ) ); - } -#endif /* MBEDTLS_SSL_SRV_C */ - -#if defined(MBEDTLS_SSL_CLI_C) - /* - * On client, either start the renegotiation process or, - * if already in progress, continue the handshake - */ - if( ssl->renego_status != MBEDTLS_SSL_RENEGOTIATION_IN_PROGRESS ) - { - if( ssl->state != MBEDTLS_SSL_HANDSHAKE_OVER ) - return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); - - if( ( ret = ssl_start_renegotiation( ssl ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "ssl_start_renegotiation", ret ); - return( ret ); - } - } - else - { - if( ( ret = mbedtls_ssl_handshake( ssl ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_handshake", ret ); - return( ret ); - } - } -#endif /* MBEDTLS_SSL_CLI_C */ - - return( ret ); -} -#endif /* MBEDTLS_SSL_RENEGOTIATION */ - -void mbedtls_ssl_transform_free( mbedtls_ssl_transform *transform ) -{ - if( transform == NULL ) - return; - -#if defined(MBEDTLS_ZLIB_SUPPORT) - deflateEnd( &transform->ctx_deflate ); - inflateEnd( &transform->ctx_inflate ); -#endif - - mbedtls_cipher_free( &transform->cipher_ctx_enc ); - mbedtls_cipher_free( &transform->cipher_ctx_dec ); - -#if defined(MBEDTLS_SSL_SOME_MODES_USE_MAC) - mbedtls_md_free( &transform->md_ctx_enc ); - mbedtls_md_free( &transform->md_ctx_dec ); -#endif - - mbedtls_platform_zeroize( transform, sizeof( mbedtls_ssl_transform ) ); -} - -#if defined(MBEDTLS_X509_CRT_PARSE_C) -static void ssl_key_cert_free( mbedtls_ssl_key_cert *key_cert ) -{ - mbedtls_ssl_key_cert *cur = key_cert, *next; - - while( cur != NULL ) - { - next = cur->next; - mbedtls_free( cur ); - cur = next; - } -} -#endif /* MBEDTLS_X509_CRT_PARSE_C */ - -void mbedtls_ssl_handshake_free( mbedtls_ssl_context *ssl ) -{ - mbedtls_ssl_handshake_params *handshake = ssl->handshake; - - if( handshake == NULL ) - return; - -#if defined(MBEDTLS_SSL_ASYNC_PRIVATE) - if( ssl->conf->f_async_cancel != NULL && handshake->async_in_progress != 0 ) - { - ssl->conf->f_async_cancel( ssl ); - handshake->async_in_progress = 0; - } -#endif /* MBEDTLS_SSL_ASYNC_PRIVATE */ - -#if defined(MBEDTLS_SSL_PROTO_SSL3) || defined(MBEDTLS_SSL_PROTO_TLS1) || \ - defined(MBEDTLS_SSL_PROTO_TLS1_1) - mbedtls_md5_free( &handshake->fin_md5 ); - mbedtls_sha1_free( &handshake->fin_sha1 ); -#endif -#if defined(MBEDTLS_SSL_PROTO_TLS1_2) -#if defined(MBEDTLS_SHA256_C) -#if defined(MBEDTLS_USE_PSA_CRYPTO) - psa_hash_abort( &handshake->fin_sha256_psa ); -#else - mbedtls_sha256_free( &handshake->fin_sha256 ); -#endif -#endif -#if defined(MBEDTLS_SHA512_C) -#if defined(MBEDTLS_USE_PSA_CRYPTO) - psa_hash_abort( &handshake->fin_sha384_psa ); -#else - mbedtls_sha512_free( &handshake->fin_sha512 ); -#endif -#endif -#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */ - -#if defined(MBEDTLS_DHM_C) - mbedtls_dhm_free( &handshake->dhm_ctx ); -#endif -#if defined(MBEDTLS_ECDH_C) - mbedtls_ecdh_free( &handshake->ecdh_ctx ); -#endif -#if defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED) - mbedtls_ecjpake_free( &handshake->ecjpake_ctx ); -#if defined(MBEDTLS_SSL_CLI_C) - mbedtls_free( handshake->ecjpake_cache ); - handshake->ecjpake_cache = NULL; - handshake->ecjpake_cache_len = 0; -#endif -#endif - -#if defined(MBEDTLS_ECDH_C) || defined(MBEDTLS_ECDSA_C) || \ - defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED) - /* explicit void pointer cast for buggy MS compiler */ - mbedtls_free( (void *) handshake->curves ); -#endif - -#if defined(MBEDTLS_KEY_EXCHANGE__SOME__PSK_ENABLED) - if( handshake->psk != NULL ) - { - mbedtls_platform_zeroize( handshake->psk, handshake->psk_len ); - mbedtls_free( handshake->psk ); - } -#endif - -#if defined(MBEDTLS_X509_CRT_PARSE_C) && \ - defined(MBEDTLS_SSL_SERVER_NAME_INDICATION) - /* - * Free only the linked list wrapper, not the keys themselves - * since the belong to the SNI callback - */ - if( handshake->sni_key_cert != NULL ) - { - mbedtls_ssl_key_cert *cur = handshake->sni_key_cert, *next; - - while( cur != NULL ) - { - next = cur->next; - mbedtls_free( cur ); - cur = next; - } - } -#endif /* MBEDTLS_X509_CRT_PARSE_C && MBEDTLS_SSL_SERVER_NAME_INDICATION */ - -#if defined(MBEDTLS_SSL__ECP_RESTARTABLE) - mbedtls_x509_crt_restart_free( &handshake->ecrs_ctx ); - if( handshake->ecrs_peer_cert != NULL ) - { - mbedtls_x509_crt_free( handshake->ecrs_peer_cert ); - mbedtls_free( handshake->ecrs_peer_cert ); - } -#endif - -#if defined(MBEDTLS_X509_CRT_PARSE_C) && \ - !defined(MBEDTLS_SSL_KEEP_PEER_CERTIFICATE) - mbedtls_pk_free( &handshake->peer_pubkey ); -#endif /* MBEDTLS_X509_CRT_PARSE_C && !MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */ - -#if defined(MBEDTLS_SSL_PROTO_DTLS) - mbedtls_free( handshake->verify_cookie ); - mbedtls_ssl_flight_free( handshake->flight ); - mbedtls_ssl_buffering_free( ssl ); -#endif - -#if defined(MBEDTLS_ECDH_C) && \ - defined(MBEDTLS_USE_PSA_CRYPTO) - psa_destroy_key( handshake->ecdh_psa_privkey ); -#endif /* MBEDTLS_ECDH_C && MBEDTLS_USE_PSA_CRYPTO */ - - mbedtls_platform_zeroize( handshake, - sizeof( mbedtls_ssl_handshake_params ) ); -} - -void mbedtls_ssl_session_free( mbedtls_ssl_session *session ) -{ - if( session == NULL ) - return; - -#if defined(MBEDTLS_X509_CRT_PARSE_C) - ssl_clear_peer_cert( session ); -#endif - -#if defined(MBEDTLS_SSL_SESSION_TICKETS) && defined(MBEDTLS_SSL_CLI_C) - mbedtls_free( session->ticket ); -#endif - - mbedtls_platform_zeroize( session, sizeof( mbedtls_ssl_session ) ); -} - -#if defined(MBEDTLS_SSL_CONTEXT_SERIALIZATION) - -#if defined(MBEDTLS_SSL_DTLS_CONNECTION_ID) -#define SSL_SERIALIZED_CONTEXT_CONFIG_DTLS_CONNECTION_ID 1u -#else -#define SSL_SERIALIZED_CONTEXT_CONFIG_DTLS_CONNECTION_ID 0u -#endif /* MBEDTLS_SSL_DTLS_CONNECTION_ID */ - -#if defined(MBEDTLS_SSL_DTLS_BADMAC_LIMIT) -#define SSL_SERIALIZED_CONTEXT_CONFIG_DTLS_BADMAC_LIMIT 1u -#else -#define SSL_SERIALIZED_CONTEXT_CONFIG_DTLS_BADMAC_LIMIT 0u -#endif /* MBEDTLS_SSL_DTLS_BADMAC_LIMIT */ - -#if defined(MBEDTLS_SSL_DTLS_ANTI_REPLAY) -#define SSL_SERIALIZED_CONTEXT_CONFIG_DTLS_ANTI_REPLAY 1u -#else -#define SSL_SERIALIZED_CONTEXT_CONFIG_DTLS_ANTI_REPLAY 0u -#endif /* MBEDTLS_SSL_DTLS_ANTI_REPLAY */ - -#if defined(MBEDTLS_SSL_ALPN) -#define SSL_SERIALIZED_CONTEXT_CONFIG_ALPN 1u -#else -#define SSL_SERIALIZED_CONTEXT_CONFIG_ALPN 0u -#endif /* MBEDTLS_SSL_ALPN */ - -#define SSL_SERIALIZED_CONTEXT_CONFIG_DTLS_CONNECTION_ID_BIT 0 -#define SSL_SERIALIZED_CONTEXT_CONFIG_DTLS_BADMAC_LIMIT_BIT 1 -#define SSL_SERIALIZED_CONTEXT_CONFIG_DTLS_ANTI_REPLAY_BIT 2 -#define SSL_SERIALIZED_CONTEXT_CONFIG_ALPN_BIT 3 - -#define SSL_SERIALIZED_CONTEXT_CONFIG_BITFLAG \ - ( (uint32_t) ( \ - ( SSL_SERIALIZED_CONTEXT_CONFIG_DTLS_CONNECTION_ID << SSL_SERIALIZED_CONTEXT_CONFIG_DTLS_CONNECTION_ID_BIT ) | \ - ( SSL_SERIALIZED_CONTEXT_CONFIG_DTLS_BADMAC_LIMIT << SSL_SERIALIZED_CONTEXT_CONFIG_DTLS_BADMAC_LIMIT_BIT ) | \ - ( SSL_SERIALIZED_CONTEXT_CONFIG_DTLS_ANTI_REPLAY << SSL_SERIALIZED_CONTEXT_CONFIG_DTLS_ANTI_REPLAY_BIT ) | \ - ( SSL_SERIALIZED_CONTEXT_CONFIG_ALPN << SSL_SERIALIZED_CONTEXT_CONFIG_ALPN_BIT ) | \ - 0u ) ) - -static unsigned char ssl_serialized_context_header[] = { - MBEDTLS_VERSION_MAJOR, - MBEDTLS_VERSION_MINOR, - MBEDTLS_VERSION_PATCH, - ( SSL_SERIALIZED_SESSION_CONFIG_BITFLAG >> 8 ) & 0xFF, - ( SSL_SERIALIZED_SESSION_CONFIG_BITFLAG >> 0 ) & 0xFF, - ( SSL_SERIALIZED_CONTEXT_CONFIG_BITFLAG >> 16 ) & 0xFF, - ( SSL_SERIALIZED_CONTEXT_CONFIG_BITFLAG >> 8 ) & 0xFF, - ( SSL_SERIALIZED_CONTEXT_CONFIG_BITFLAG >> 0 ) & 0xFF, -}; - -/* - * Serialize a full SSL context - * - * The format of the serialized data is: - * (in the presentation language of TLS, RFC 8446 section 3) - * - * // header - * opaque mbedtls_version[3]; // major, minor, patch - * opaque context_format[5]; // version-specific field determining - * // the format of the remaining - * // serialized data. - * Note: When updating the format, remember to keep these - * version+format bytes. (We may make their size part of the API.) - * - * // session sub-structure - * opaque session<1..2^32-1>; // see mbedtls_ssl_session_save() - * // transform sub-structure - * uint8 random[64]; // ServerHello.random+ClientHello.random - * uint8 in_cid<0..2^8-1> // Connection ID: expected incoming value - * uint8 out_cid<0..2^8-1> // Connection ID: outgoing value to use - * // fields from ssl_context - * uint32 badmac_seen; // DTLS: number of records with failing MAC - * uint64 in_window_top; // DTLS: last validated record seq_num - * uint64 in_window; // DTLS: bitmask for replay protection - * uint8 disable_datagram_packing; // DTLS: only one record per datagram - * uint64 cur_out_ctr; // Record layer: outgoing sequence number - * uint16 mtu; // DTLS: path mtu (max outgoing fragment size) - * uint8 alpn_chosen<0..2^8-1> // ALPN: negotiated application protocol - * - * Note that many fields of the ssl_context or sub-structures are not - * serialized, as they fall in one of the following categories: - * - * 1. forced value (eg in_left must be 0) - * 2. pointer to dynamically-allocated memory (eg session, transform) - * 3. value can be re-derived from other data (eg session keys from MS) - * 4. value was temporary (eg content of input buffer) - * 5. value will be provided by the user again (eg I/O callbacks and context) - */ -int mbedtls_ssl_context_save( mbedtls_ssl_context *ssl, - unsigned char *buf, - size_t buf_len, - size_t *olen ) -{ - unsigned char *p = buf; - size_t used = 0; - size_t session_len; - int ret = 0; - - /* - * Enforce usage restrictions, see "return BAD_INPUT_DATA" in - * this function's documentation. - * - * These are due to assumptions/limitations in the implementation. Some of - * them are likely to stay (no handshake in progress) some might go away - * (only DTLS) but are currently used to simplify the implementation. - */ - /* The initial handshake must be over */ - if( ssl->state != MBEDTLS_SSL_HANDSHAKE_OVER ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "Initial handshake isn't over" ) ); - return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); - } - if( ssl->handshake != NULL ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "Handshake isn't completed" ) ); - return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); - } - /* Double-check that sub-structures are indeed ready */ - if( ssl->transform == NULL || ssl->session == NULL ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "Serialised structures aren't ready" ) ); - return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); - } - /* There must be no pending incoming or outgoing data */ - if( mbedtls_ssl_check_pending( ssl ) != 0 ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "There is pending incoming data" ) ); - return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); - } - if( ssl->out_left != 0 ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "There is pending outgoing data" ) ); - return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); - } - /* Protocol must be DLTS, not TLS */ - if( ssl->conf->transport != MBEDTLS_SSL_TRANSPORT_DATAGRAM ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "Only DTLS is supported" ) ); - return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); - } - /* Version must be 1.2 */ - if( ssl->major_ver != MBEDTLS_SSL_MAJOR_VERSION_3 ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "Only version 1.2 supported" ) ); - return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); - } - if( ssl->minor_ver != MBEDTLS_SSL_MINOR_VERSION_3 ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "Only version 1.2 supported" ) ); - return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); - } - /* We must be using an AEAD ciphersuite */ - if( mbedtls_ssl_transform_uses_aead( ssl->transform ) != 1 ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "Only AEAD ciphersuites supported" ) ); - return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); - } - /* Renegotiation must not be enabled */ -#if defined(MBEDTLS_SSL_RENEGOTIATION) - if( ssl->conf->disable_renegotiation != MBEDTLS_SSL_RENEGOTIATION_DISABLED ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "Renegotiation must not be enabled" ) ); - return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); - } -#endif - - /* - * Version and format identifier - */ - used += sizeof( ssl_serialized_context_header ); - - if( used <= buf_len ) - { - memcpy( p, ssl_serialized_context_header, - sizeof( ssl_serialized_context_header ) ); - p += sizeof( ssl_serialized_context_header ); - } - - /* - * Session (length + data) - */ - ret = ssl_session_save( ssl->session, 1, NULL, 0, &session_len ); - if( ret != MBEDTLS_ERR_SSL_BUFFER_TOO_SMALL ) - return( ret ); - - used += 4 + session_len; - if( used <= buf_len ) - { - *p++ = (unsigned char)( ( session_len >> 24 ) & 0xFF ); - *p++ = (unsigned char)( ( session_len >> 16 ) & 0xFF ); - *p++ = (unsigned char)( ( session_len >> 8 ) & 0xFF ); - *p++ = (unsigned char)( ( session_len ) & 0xFF ); - - ret = ssl_session_save( ssl->session, 1, - p, session_len, &session_len ); - if( ret != 0 ) - return( ret ); - - p += session_len; - } - - /* - * Transform - */ - used += sizeof( ssl->transform->randbytes ); - if( used <= buf_len ) - { - memcpy( p, ssl->transform->randbytes, - sizeof( ssl->transform->randbytes ) ); - p += sizeof( ssl->transform->randbytes ); - } - -#if defined(MBEDTLS_SSL_DTLS_CONNECTION_ID) - used += 2 + ssl->transform->in_cid_len + ssl->transform->out_cid_len; - if( used <= buf_len ) - { - *p++ = ssl->transform->in_cid_len; - memcpy( p, ssl->transform->in_cid, ssl->transform->in_cid_len ); - p += ssl->transform->in_cid_len; - - *p++ = ssl->transform->out_cid_len; - memcpy( p, ssl->transform->out_cid, ssl->transform->out_cid_len ); - p += ssl->transform->out_cid_len; - } -#endif /* MBEDTLS_SSL_DTLS_CONNECTION_ID */ - - /* - * Saved fields from top-level ssl_context structure - */ -#if defined(MBEDTLS_SSL_DTLS_BADMAC_LIMIT) - used += 4; - if( used <= buf_len ) - { - *p++ = (unsigned char)( ( ssl->badmac_seen >> 24 ) & 0xFF ); - *p++ = (unsigned char)( ( ssl->badmac_seen >> 16 ) & 0xFF ); - *p++ = (unsigned char)( ( ssl->badmac_seen >> 8 ) & 0xFF ); - *p++ = (unsigned char)( ( ssl->badmac_seen ) & 0xFF ); - } -#endif /* MBEDTLS_SSL_DTLS_BADMAC_LIMIT */ - -#if defined(MBEDTLS_SSL_DTLS_ANTI_REPLAY) - used += 16; - if( used <= buf_len ) - { - *p++ = (unsigned char)( ( ssl->in_window_top >> 56 ) & 0xFF ); - *p++ = (unsigned char)( ( ssl->in_window_top >> 48 ) & 0xFF ); - *p++ = (unsigned char)( ( ssl->in_window_top >> 40 ) & 0xFF ); - *p++ = (unsigned char)( ( ssl->in_window_top >> 32 ) & 0xFF ); - *p++ = (unsigned char)( ( ssl->in_window_top >> 24 ) & 0xFF ); - *p++ = (unsigned char)( ( ssl->in_window_top >> 16 ) & 0xFF ); - *p++ = (unsigned char)( ( ssl->in_window_top >> 8 ) & 0xFF ); - *p++ = (unsigned char)( ( ssl->in_window_top ) & 0xFF ); - - *p++ = (unsigned char)( ( ssl->in_window >> 56 ) & 0xFF ); - *p++ = (unsigned char)( ( ssl->in_window >> 48 ) & 0xFF ); - *p++ = (unsigned char)( ( ssl->in_window >> 40 ) & 0xFF ); - *p++ = (unsigned char)( ( ssl->in_window >> 32 ) & 0xFF ); - *p++ = (unsigned char)( ( ssl->in_window >> 24 ) & 0xFF ); - *p++ = (unsigned char)( ( ssl->in_window >> 16 ) & 0xFF ); - *p++ = (unsigned char)( ( ssl->in_window >> 8 ) & 0xFF ); - *p++ = (unsigned char)( ( ssl->in_window ) & 0xFF ); - } -#endif /* MBEDTLS_SSL_DTLS_ANTI_REPLAY */ - -#if defined(MBEDTLS_SSL_PROTO_DTLS) - used += 1; - if( used <= buf_len ) - { - *p++ = ssl->disable_datagram_packing; - } -#endif /* MBEDTLS_SSL_PROTO_DTLS */ - - used += 8; - if( used <= buf_len ) - { - memcpy( p, ssl->cur_out_ctr, 8 ); - p += 8; - } - -#if defined(MBEDTLS_SSL_PROTO_DTLS) - used += 2; - if( used <= buf_len ) - { - *p++ = (unsigned char)( ( ssl->mtu >> 8 ) & 0xFF ); - *p++ = (unsigned char)( ( ssl->mtu ) & 0xFF ); - } -#endif /* MBEDTLS_SSL_PROTO_DTLS */ - -#if defined(MBEDTLS_SSL_ALPN) - { - const uint8_t alpn_len = ssl->alpn_chosen - ? (uint8_t) strlen( ssl->alpn_chosen ) - : 0; - - used += 1 + alpn_len; - if( used <= buf_len ) - { - *p++ = alpn_len; - - if( ssl->alpn_chosen != NULL ) - { - memcpy( p, ssl->alpn_chosen, alpn_len ); - p += alpn_len; - } - } - } -#endif /* MBEDTLS_SSL_ALPN */ - - /* - * Done - */ - *olen = used; - - if( used > buf_len ) - return( MBEDTLS_ERR_SSL_BUFFER_TOO_SMALL ); - - MBEDTLS_SSL_DEBUG_BUF( 4, "saved context", buf, used ); - - return( mbedtls_ssl_session_reset_int( ssl, 0 ) ); -} - -/* - * Helper to get TLS 1.2 PRF from ciphersuite - * (Duplicates bits of logic from ssl_set_handshake_prfs().) - */ -typedef int (*tls_prf_fn)( const unsigned char *secret, size_t slen, - const char *label, - const unsigned char *random, size_t rlen, - unsigned char *dstbuf, size_t dlen ); -static tls_prf_fn ssl_tls12prf_from_cs( int ciphersuite_id ) -{ -#if defined(MBEDTLS_SHA512_C) - const mbedtls_ssl_ciphersuite_t * const ciphersuite_info = - mbedtls_ssl_ciphersuite_from_id( ciphersuite_id ); - - if( ciphersuite_info->mac == MBEDTLS_MD_SHA384 ) - return( tls_prf_sha384 ); -#else - (void) ciphersuite_id; -#endif - return( tls_prf_sha256 ); -} - -/* - * Deserialize context, see mbedtls_ssl_context_save() for format. - * - * This internal version is wrapped by a public function that cleans up in - * case of error. - */ -static int ssl_context_load( mbedtls_ssl_context *ssl, - const unsigned char *buf, - size_t len ) -{ - const unsigned char *p = buf; - const unsigned char * const end = buf + len; - size_t session_len; - int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; - - /* - * The context should have been freshly setup or reset. - * Give the user an error in case of obvious misuse. - * (Checking session is useful because it won't be NULL if we're - * renegotiating, or if the user mistakenly loaded a session first.) - */ - if( ssl->state != MBEDTLS_SSL_HELLO_REQUEST || - ssl->session != NULL ) - { - return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); - } - - /* - * We can't check that the config matches the initial one, but we can at - * least check it matches the requirements for serializing. - */ - if( ssl->conf->transport != MBEDTLS_SSL_TRANSPORT_DATAGRAM || - ssl->conf->max_major_ver < MBEDTLS_SSL_MAJOR_VERSION_3 || - ssl->conf->min_major_ver > MBEDTLS_SSL_MAJOR_VERSION_3 || - ssl->conf->max_minor_ver < MBEDTLS_SSL_MINOR_VERSION_3 || - ssl->conf->min_minor_ver > MBEDTLS_SSL_MINOR_VERSION_3 || -#if defined(MBEDTLS_SSL_RENEGOTIATION) - ssl->conf->disable_renegotiation != MBEDTLS_SSL_RENEGOTIATION_DISABLED || -#endif - 0 ) - { - return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); - } - - MBEDTLS_SSL_DEBUG_BUF( 4, "context to load", buf, len ); - - /* - * Check version identifier - */ - if( (size_t)( end - p ) < sizeof( ssl_serialized_context_header ) ) - return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); - - if( memcmp( p, ssl_serialized_context_header, - sizeof( ssl_serialized_context_header ) ) != 0 ) - { - return( MBEDTLS_ERR_SSL_VERSION_MISMATCH ); - } - p += sizeof( ssl_serialized_context_header ); - - /* - * Session - */ - if( (size_t)( end - p ) < 4 ) - return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); - - session_len = ( (size_t) p[0] << 24 ) | - ( (size_t) p[1] << 16 ) | - ( (size_t) p[2] << 8 ) | - ( (size_t) p[3] ); - p += 4; - - /* This has been allocated by ssl_handshake_init(), called by - * by either mbedtls_ssl_session_reset_int() or mbedtls_ssl_setup(). */ - ssl->session = ssl->session_negotiate; - ssl->session_in = ssl->session; - ssl->session_out = ssl->session; - ssl->session_negotiate = NULL; - - if( (size_t)( end - p ) < session_len ) - return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); - - ret = ssl_session_load( ssl->session, 1, p, session_len ); - if( ret != 0 ) - { - mbedtls_ssl_session_free( ssl->session ); - return( ret ); - } - - p += session_len; - - /* - * Transform - */ - - /* This has been allocated by ssl_handshake_init(), called by - * by either mbedtls_ssl_session_reset_int() or mbedtls_ssl_setup(). */ - ssl->transform = ssl->transform_negotiate; - ssl->transform_in = ssl->transform; - ssl->transform_out = ssl->transform; - ssl->transform_negotiate = NULL; - - /* Read random bytes and populate structure */ - if( (size_t)( end - p ) < sizeof( ssl->transform->randbytes ) ) - return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); - - ret = ssl_populate_transform( ssl->transform, - ssl->session->ciphersuite, - ssl->session->master, -#if defined(MBEDTLS_SSL_SOME_MODES_USE_MAC) -#if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC) - ssl->session->encrypt_then_mac, -#endif -#if defined(MBEDTLS_SSL_TRUNCATED_HMAC) - ssl->session->trunc_hmac, -#endif -#endif /* MBEDTLS_SSL_SOME_MODES_USE_MAC */ -#if defined(MBEDTLS_ZLIB_SUPPORT) - ssl->session->compression, -#endif - ssl_tls12prf_from_cs( ssl->session->ciphersuite ), - p, /* currently pointing to randbytes */ - MBEDTLS_SSL_MINOR_VERSION_3, /* (D)TLS 1.2 is forced */ - ssl->conf->endpoint, - ssl ); - if( ret != 0 ) - return( ret ); - - p += sizeof( ssl->transform->randbytes ); - -#if defined(MBEDTLS_SSL_DTLS_CONNECTION_ID) - /* Read connection IDs and store them */ - if( (size_t)( end - p ) < 1 ) - return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); - - ssl->transform->in_cid_len = *p++; - - if( (size_t)( end - p ) < ssl->transform->in_cid_len + 1u ) - return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); - - memcpy( ssl->transform->in_cid, p, ssl->transform->in_cid_len ); - p += ssl->transform->in_cid_len; - - ssl->transform->out_cid_len = *p++; - - if( (size_t)( end - p ) < ssl->transform->out_cid_len ) - return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); - - memcpy( ssl->transform->out_cid, p, ssl->transform->out_cid_len ); - p += ssl->transform->out_cid_len; -#endif /* MBEDTLS_SSL_DTLS_CONNECTION_ID */ - - /* - * Saved fields from top-level ssl_context structure - */ -#if defined(MBEDTLS_SSL_DTLS_BADMAC_LIMIT) - if( (size_t)( end - p ) < 4 ) - return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); - - ssl->badmac_seen = ( (uint32_t) p[0] << 24 ) | - ( (uint32_t) p[1] << 16 ) | - ( (uint32_t) p[2] << 8 ) | - ( (uint32_t) p[3] ); - p += 4; -#endif /* MBEDTLS_SSL_DTLS_BADMAC_LIMIT */ - -#if defined(MBEDTLS_SSL_DTLS_ANTI_REPLAY) - if( (size_t)( end - p ) < 16 ) - return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); - - ssl->in_window_top = ( (uint64_t) p[0] << 56 ) | - ( (uint64_t) p[1] << 48 ) | - ( (uint64_t) p[2] << 40 ) | - ( (uint64_t) p[3] << 32 ) | - ( (uint64_t) p[4] << 24 ) | - ( (uint64_t) p[5] << 16 ) | - ( (uint64_t) p[6] << 8 ) | - ( (uint64_t) p[7] ); - p += 8; - - ssl->in_window = ( (uint64_t) p[0] << 56 ) | - ( (uint64_t) p[1] << 48 ) | - ( (uint64_t) p[2] << 40 ) | - ( (uint64_t) p[3] << 32 ) | - ( (uint64_t) p[4] << 24 ) | - ( (uint64_t) p[5] << 16 ) | - ( (uint64_t) p[6] << 8 ) | - ( (uint64_t) p[7] ); - p += 8; -#endif /* MBEDTLS_SSL_DTLS_ANTI_REPLAY */ - -#if defined(MBEDTLS_SSL_PROTO_DTLS) - if( (size_t)( end - p ) < 1 ) - return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); - - ssl->disable_datagram_packing = *p++; -#endif /* MBEDTLS_SSL_PROTO_DTLS */ - - if( (size_t)( end - p ) < 8 ) - return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); - - memcpy( ssl->cur_out_ctr, p, 8 ); - p += 8; - -#if defined(MBEDTLS_SSL_PROTO_DTLS) - if( (size_t)( end - p ) < 2 ) - return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); - - ssl->mtu = ( p[0] << 8 ) | p[1]; - p += 2; -#endif /* MBEDTLS_SSL_PROTO_DTLS */ - -#if defined(MBEDTLS_SSL_ALPN) - { - uint8_t alpn_len; - const char **cur; - - if( (size_t)( end - p ) < 1 ) - return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); - - alpn_len = *p++; - - if( alpn_len != 0 && ssl->conf->alpn_list != NULL ) - { - /* alpn_chosen should point to an item in the configured list */ - for( cur = ssl->conf->alpn_list; *cur != NULL; cur++ ) - { - if( strlen( *cur ) == alpn_len && - memcmp( p, cur, alpn_len ) == 0 ) - { - ssl->alpn_chosen = *cur; - break; - } - } - } - - /* can only happen on conf mismatch */ - if( alpn_len != 0 && ssl->alpn_chosen == NULL ) - return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); - - p += alpn_len; - } -#endif /* MBEDTLS_SSL_ALPN */ - - /* - * Forced fields from top-level ssl_context structure - * - * Most of them already set to the correct value by mbedtls_ssl_init() and - * mbedtls_ssl_reset(), so we only need to set the remaining ones. - */ - ssl->state = MBEDTLS_SSL_HANDSHAKE_OVER; - - ssl->major_ver = MBEDTLS_SSL_MAJOR_VERSION_3; - ssl->minor_ver = MBEDTLS_SSL_MINOR_VERSION_3; - - /* Adjust pointers for header fields of outgoing records to - * the given transform, accounting for explicit IV and CID. */ - mbedtls_ssl_update_out_pointers( ssl, ssl->transform ); - -#if defined(MBEDTLS_SSL_PROTO_DTLS) - ssl->in_epoch = 1; -#endif - - /* mbedtls_ssl_reset() leaves the handshake sub-structure allocated, - * which we don't want - otherwise we'd end up freeing the wrong transform - * by calling mbedtls_ssl_handshake_wrapup_free_hs_transform() - * inappropriately. */ - if( ssl->handshake != NULL ) - { - mbedtls_ssl_handshake_free( ssl ); - mbedtls_free( ssl->handshake ); - ssl->handshake = NULL; - } - - /* - * Done - should have consumed entire buffer - */ - if( p != end ) - return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); - - return( 0 ); -} - -/* - * Deserialize context: public wrapper for error cleaning - */ -int mbedtls_ssl_context_load( mbedtls_ssl_context *context, - const unsigned char *buf, - size_t len ) -{ - int ret = ssl_context_load( context, buf, len ); - - if( ret != 0 ) - mbedtls_ssl_free( context ); - - return( ret ); -} -#endif /* MBEDTLS_SSL_CONTEXT_SERIALIZATION */ - -/* - * Free an SSL context - */ -void mbedtls_ssl_free( mbedtls_ssl_context *ssl ) -{ - if( ssl == NULL ) - return; - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> free" ) ); - - if( ssl->out_buf != NULL ) - { - mbedtls_platform_zeroize( ssl->out_buf, MBEDTLS_SSL_OUT_BUFFER_LEN ); - mbedtls_free( ssl->out_buf ); - } - - if( ssl->in_buf != NULL ) - { - mbedtls_platform_zeroize( ssl->in_buf, MBEDTLS_SSL_IN_BUFFER_LEN ); - mbedtls_free( ssl->in_buf ); - } - -#if defined(MBEDTLS_ZLIB_SUPPORT) - if( ssl->compress_buf != NULL ) - { - mbedtls_platform_zeroize( ssl->compress_buf, MBEDTLS_SSL_COMPRESS_BUFFER_LEN ); - mbedtls_free( ssl->compress_buf ); - } -#endif - - if( ssl->transform ) - { - mbedtls_ssl_transform_free( ssl->transform ); - mbedtls_free( ssl->transform ); - } - - if( ssl->handshake ) - { - mbedtls_ssl_handshake_free( ssl ); - mbedtls_ssl_transform_free( ssl->transform_negotiate ); - mbedtls_ssl_session_free( ssl->session_negotiate ); - - mbedtls_free( ssl->handshake ); - mbedtls_free( ssl->transform_negotiate ); - mbedtls_free( ssl->session_negotiate ); - } - - if( ssl->session ) - { - mbedtls_ssl_session_free( ssl->session ); - mbedtls_free( ssl->session ); - } - -#if defined(MBEDTLS_X509_CRT_PARSE_C) - if( ssl->hostname != NULL ) - { - mbedtls_platform_zeroize( ssl->hostname, strlen( ssl->hostname ) ); - mbedtls_free( ssl->hostname ); - } -#endif - -#if defined(MBEDTLS_SSL_HW_RECORD_ACCEL) - if( mbedtls_ssl_hw_record_finish != NULL ) - { - MBEDTLS_SSL_DEBUG_MSG( 2, ( "going for mbedtls_ssl_hw_record_finish()" ) ); - mbedtls_ssl_hw_record_finish( ssl ); - } -#endif - -#if defined(MBEDTLS_SSL_DTLS_HELLO_VERIFY) && defined(MBEDTLS_SSL_SRV_C) - mbedtls_free( ssl->cli_id ); -#endif - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= free" ) ); - - /* Actually clear after last debug message */ - mbedtls_platform_zeroize( ssl, sizeof( mbedtls_ssl_context ) ); -} - -/* - * Initialze mbedtls_ssl_config - */ -void mbedtls_ssl_config_init( mbedtls_ssl_config *conf ) -{ - memset( conf, 0, sizeof( mbedtls_ssl_config ) ); -} - -#if defined(MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED) -static int ssl_preset_default_hashes[] = { -#if defined(MBEDTLS_SHA512_C) - MBEDTLS_MD_SHA512, - MBEDTLS_MD_SHA384, -#endif -#if defined(MBEDTLS_SHA256_C) - MBEDTLS_MD_SHA256, - MBEDTLS_MD_SHA224, -#endif -#if defined(MBEDTLS_SHA1_C) && defined(MBEDTLS_TLS_DEFAULT_ALLOW_SHA1_IN_KEY_EXCHANGE) - MBEDTLS_MD_SHA1, -#endif - MBEDTLS_MD_NONE -}; -#endif - -static int ssl_preset_suiteb_ciphersuites[] = { - MBEDTLS_TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256, - MBEDTLS_TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384, - 0 -}; - -#if defined(MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED) -static int ssl_preset_suiteb_hashes[] = { - MBEDTLS_MD_SHA256, - MBEDTLS_MD_SHA384, - MBEDTLS_MD_NONE -}; -#endif - -#if defined(MBEDTLS_ECP_C) -static mbedtls_ecp_group_id ssl_preset_suiteb_curves[] = { -#if defined(MBEDTLS_ECP_DP_SECP256R1_ENABLED) - MBEDTLS_ECP_DP_SECP256R1, -#endif -#if defined(MBEDTLS_ECP_DP_SECP384R1_ENABLED) - MBEDTLS_ECP_DP_SECP384R1, -#endif - MBEDTLS_ECP_DP_NONE -}; -#endif - -/* - * Load default in mbedtls_ssl_config - */ -int mbedtls_ssl_config_defaults( mbedtls_ssl_config *conf, - int endpoint, int transport, int preset ) -{ -#if defined(MBEDTLS_DHM_C) && defined(MBEDTLS_SSL_SRV_C) - int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; -#endif - - /* Use the functions here so that they are covered in tests, - * but otherwise access member directly for efficiency */ - mbedtls_ssl_conf_endpoint( conf, endpoint ); - mbedtls_ssl_conf_transport( conf, transport ); - - /* - * Things that are common to all presets - */ -#if defined(MBEDTLS_SSL_CLI_C) - if( endpoint == MBEDTLS_SSL_IS_CLIENT ) - { - conf->authmode = MBEDTLS_SSL_VERIFY_REQUIRED; -#if defined(MBEDTLS_SSL_SESSION_TICKETS) - conf->session_tickets = MBEDTLS_SSL_SESSION_TICKETS_ENABLED; -#endif - } -#endif - -#if defined(MBEDTLS_ARC4_C) - conf->arc4_disabled = MBEDTLS_SSL_ARC4_DISABLED; -#endif - -#if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC) - conf->encrypt_then_mac = MBEDTLS_SSL_ETM_ENABLED; -#endif - -#if defined(MBEDTLS_SSL_EXTENDED_MASTER_SECRET) - conf->extended_ms = MBEDTLS_SSL_EXTENDED_MS_ENABLED; -#endif - -#if defined(MBEDTLS_SSL_CBC_RECORD_SPLITTING) - conf->cbc_record_splitting = MBEDTLS_SSL_CBC_RECORD_SPLITTING_ENABLED; -#endif - -#if defined(MBEDTLS_SSL_DTLS_HELLO_VERIFY) && defined(MBEDTLS_SSL_SRV_C) - conf->f_cookie_write = ssl_cookie_write_dummy; - conf->f_cookie_check = ssl_cookie_check_dummy; -#endif - -#if defined(MBEDTLS_SSL_DTLS_ANTI_REPLAY) - conf->anti_replay = MBEDTLS_SSL_ANTI_REPLAY_ENABLED; -#endif - -#if defined(MBEDTLS_SSL_SRV_C) - conf->cert_req_ca_list = MBEDTLS_SSL_CERT_REQ_CA_LIST_ENABLED; -#endif - -#if defined(MBEDTLS_SSL_PROTO_DTLS) - conf->hs_timeout_min = MBEDTLS_SSL_DTLS_TIMEOUT_DFL_MIN; - conf->hs_timeout_max = MBEDTLS_SSL_DTLS_TIMEOUT_DFL_MAX; -#endif - -#if defined(MBEDTLS_SSL_RENEGOTIATION) - conf->renego_max_records = MBEDTLS_SSL_RENEGO_MAX_RECORDS_DEFAULT; - memset( conf->renego_period, 0x00, 2 ); - memset( conf->renego_period + 2, 0xFF, 6 ); -#endif - -#if defined(MBEDTLS_DHM_C) && defined(MBEDTLS_SSL_SRV_C) - if( endpoint == MBEDTLS_SSL_IS_SERVER ) - { - const unsigned char dhm_p[] = - MBEDTLS_DHM_RFC3526_MODP_2048_P_BIN; - const unsigned char dhm_g[] = - MBEDTLS_DHM_RFC3526_MODP_2048_G_BIN; - - if ( ( ret = mbedtls_ssl_conf_dh_param_bin( conf, - dhm_p, sizeof( dhm_p ), - dhm_g, sizeof( dhm_g ) ) ) != 0 ) - { - return( ret ); - } - } -#endif - - /* - * Preset-specific defaults - */ - switch( preset ) - { - /* - * NSA Suite B - */ - case MBEDTLS_SSL_PRESET_SUITEB: - conf->min_major_ver = MBEDTLS_SSL_MAJOR_VERSION_3; - conf->min_minor_ver = MBEDTLS_SSL_MINOR_VERSION_3; /* TLS 1.2 */ - conf->max_major_ver = MBEDTLS_SSL_MAX_MAJOR_VERSION; - conf->max_minor_ver = MBEDTLS_SSL_MAX_MINOR_VERSION; - - conf->ciphersuite_list[MBEDTLS_SSL_MINOR_VERSION_0] = - conf->ciphersuite_list[MBEDTLS_SSL_MINOR_VERSION_1] = - conf->ciphersuite_list[MBEDTLS_SSL_MINOR_VERSION_2] = - conf->ciphersuite_list[MBEDTLS_SSL_MINOR_VERSION_3] = - ssl_preset_suiteb_ciphersuites; - -#if defined(MBEDTLS_X509_CRT_PARSE_C) - conf->cert_profile = &mbedtls_x509_crt_profile_suiteb; -#endif - -#if defined(MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED) - conf->sig_hashes = ssl_preset_suiteb_hashes; -#endif - -#if defined(MBEDTLS_ECP_C) - conf->curve_list = ssl_preset_suiteb_curves; -#endif - break; - - /* - * Default - */ - default: - conf->min_major_ver = ( MBEDTLS_SSL_MIN_MAJOR_VERSION > - MBEDTLS_SSL_MIN_VALID_MAJOR_VERSION ) ? - MBEDTLS_SSL_MIN_MAJOR_VERSION : - MBEDTLS_SSL_MIN_VALID_MAJOR_VERSION; - conf->min_minor_ver = ( MBEDTLS_SSL_MIN_MINOR_VERSION > - MBEDTLS_SSL_MIN_VALID_MINOR_VERSION ) ? - MBEDTLS_SSL_MIN_MINOR_VERSION : - MBEDTLS_SSL_MIN_VALID_MINOR_VERSION; - conf->max_major_ver = MBEDTLS_SSL_MAX_MAJOR_VERSION; - conf->max_minor_ver = MBEDTLS_SSL_MAX_MINOR_VERSION; - -#if defined(MBEDTLS_SSL_PROTO_DTLS) - if( transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM ) - conf->min_minor_ver = MBEDTLS_SSL_MINOR_VERSION_2; -#endif - - conf->ciphersuite_list[MBEDTLS_SSL_MINOR_VERSION_0] = - conf->ciphersuite_list[MBEDTLS_SSL_MINOR_VERSION_1] = - conf->ciphersuite_list[MBEDTLS_SSL_MINOR_VERSION_2] = - conf->ciphersuite_list[MBEDTLS_SSL_MINOR_VERSION_3] = - mbedtls_ssl_list_ciphersuites(); - -#if defined(MBEDTLS_X509_CRT_PARSE_C) - conf->cert_profile = &mbedtls_x509_crt_profile_default; -#endif - -#if defined(MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED) - conf->sig_hashes = ssl_preset_default_hashes; -#endif - -#if defined(MBEDTLS_ECP_C) - conf->curve_list = mbedtls_ecp_grp_id_list(); -#endif - -#if defined(MBEDTLS_DHM_C) && defined(MBEDTLS_SSL_CLI_C) - conf->dhm_min_bitlen = 1024; -#endif - } - - return( 0 ); -} - -/* - * Free mbedtls_ssl_config - */ -void mbedtls_ssl_config_free( mbedtls_ssl_config *conf ) -{ -#if defined(MBEDTLS_DHM_C) - mbedtls_mpi_free( &conf->dhm_P ); - mbedtls_mpi_free( &conf->dhm_G ); -#endif - -#if defined(MBEDTLS_KEY_EXCHANGE__SOME__PSK_ENABLED) - if( conf->psk != NULL ) - { - mbedtls_platform_zeroize( conf->psk, conf->psk_len ); - mbedtls_free( conf->psk ); - conf->psk = NULL; - conf->psk_len = 0; - } - - if( conf->psk_identity != NULL ) - { - mbedtls_platform_zeroize( conf->psk_identity, conf->psk_identity_len ); - mbedtls_free( conf->psk_identity ); - conf->psk_identity = NULL; - conf->psk_identity_len = 0; - } -#endif - -#if defined(MBEDTLS_X509_CRT_PARSE_C) - ssl_key_cert_free( conf->key_cert ); -#endif - - mbedtls_platform_zeroize( conf, sizeof( mbedtls_ssl_config ) ); -} - -#if defined(MBEDTLS_PK_C) && \ - ( defined(MBEDTLS_RSA_C) || defined(MBEDTLS_ECDSA_C) ) -/* - * Convert between MBEDTLS_PK_XXX and SSL_SIG_XXX - */ -unsigned char mbedtls_ssl_sig_from_pk( mbedtls_pk_context *pk ) -{ -#if defined(MBEDTLS_RSA_C) - if( mbedtls_pk_can_do( pk, MBEDTLS_PK_RSA ) ) - return( MBEDTLS_SSL_SIG_RSA ); -#endif -#if defined(MBEDTLS_ECDSA_C) - if( mbedtls_pk_can_do( pk, MBEDTLS_PK_ECDSA ) ) - return( MBEDTLS_SSL_SIG_ECDSA ); -#endif - return( MBEDTLS_SSL_SIG_ANON ); -} - -unsigned char mbedtls_ssl_sig_from_pk_alg( mbedtls_pk_type_t type ) -{ - switch( type ) { - case MBEDTLS_PK_RSA: - return( MBEDTLS_SSL_SIG_RSA ); - case MBEDTLS_PK_ECDSA: - case MBEDTLS_PK_ECKEY: - return( MBEDTLS_SSL_SIG_ECDSA ); - default: - return( MBEDTLS_SSL_SIG_ANON ); - } -} - -mbedtls_pk_type_t mbedtls_ssl_pk_alg_from_sig( unsigned char sig ) -{ - switch( sig ) - { -#if defined(MBEDTLS_RSA_C) - case MBEDTLS_SSL_SIG_RSA: - return( MBEDTLS_PK_RSA ); -#endif -#if defined(MBEDTLS_ECDSA_C) - case MBEDTLS_SSL_SIG_ECDSA: - return( MBEDTLS_PK_ECDSA ); -#endif - default: - return( MBEDTLS_PK_NONE ); - } -} -#endif /* MBEDTLS_PK_C && ( MBEDTLS_RSA_C || MBEDTLS_ECDSA_C ) */ - -#if defined(MBEDTLS_SSL_PROTO_TLS1_2) && \ - defined(MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED) - -/* Find an entry in a signature-hash set matching a given hash algorithm. */ -mbedtls_md_type_t mbedtls_ssl_sig_hash_set_find( mbedtls_ssl_sig_hash_set_t *set, - mbedtls_pk_type_t sig_alg ) -{ - switch( sig_alg ) - { - case MBEDTLS_PK_RSA: - return( set->rsa ); - case MBEDTLS_PK_ECDSA: - return( set->ecdsa ); - default: - return( MBEDTLS_MD_NONE ); - } -} - -/* Add a signature-hash-pair to a signature-hash set */ -void mbedtls_ssl_sig_hash_set_add( mbedtls_ssl_sig_hash_set_t *set, - mbedtls_pk_type_t sig_alg, - mbedtls_md_type_t md_alg ) -{ - switch( sig_alg ) - { - case MBEDTLS_PK_RSA: - if( set->rsa == MBEDTLS_MD_NONE ) - set->rsa = md_alg; - break; - - case MBEDTLS_PK_ECDSA: - if( set->ecdsa == MBEDTLS_MD_NONE ) - set->ecdsa = md_alg; - break; - - default: - break; - } -} - -/* Allow exactly one hash algorithm for each signature. */ -void mbedtls_ssl_sig_hash_set_const_hash( mbedtls_ssl_sig_hash_set_t *set, - mbedtls_md_type_t md_alg ) -{ - set->rsa = md_alg; - set->ecdsa = md_alg; -} - -#endif /* MBEDTLS_SSL_PROTO_TLS1_2) && - MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED */ - -/* - * Convert from MBEDTLS_SSL_HASH_XXX to MBEDTLS_MD_XXX - */ -mbedtls_md_type_t mbedtls_ssl_md_alg_from_hash( unsigned char hash ) -{ - switch( hash ) - { -#if defined(MBEDTLS_MD5_C) - case MBEDTLS_SSL_HASH_MD5: - return( MBEDTLS_MD_MD5 ); -#endif -#if defined(MBEDTLS_SHA1_C) - case MBEDTLS_SSL_HASH_SHA1: - return( MBEDTLS_MD_SHA1 ); -#endif -#if defined(MBEDTLS_SHA256_C) - case MBEDTLS_SSL_HASH_SHA224: - return( MBEDTLS_MD_SHA224 ); - case MBEDTLS_SSL_HASH_SHA256: - return( MBEDTLS_MD_SHA256 ); -#endif -#if defined(MBEDTLS_SHA512_C) - case MBEDTLS_SSL_HASH_SHA384: - return( MBEDTLS_MD_SHA384 ); - case MBEDTLS_SSL_HASH_SHA512: - return( MBEDTLS_MD_SHA512 ); -#endif - default: - return( MBEDTLS_MD_NONE ); - } -} - -/* - * Convert from MBEDTLS_MD_XXX to MBEDTLS_SSL_HASH_XXX - */ -unsigned char mbedtls_ssl_hash_from_md_alg( int md ) -{ - switch( md ) - { -#if defined(MBEDTLS_MD5_C) - case MBEDTLS_MD_MD5: - return( MBEDTLS_SSL_HASH_MD5 ); -#endif -#if defined(MBEDTLS_SHA1_C) - case MBEDTLS_MD_SHA1: - return( MBEDTLS_SSL_HASH_SHA1 ); -#endif -#if defined(MBEDTLS_SHA256_C) - case MBEDTLS_MD_SHA224: - return( MBEDTLS_SSL_HASH_SHA224 ); - case MBEDTLS_MD_SHA256: - return( MBEDTLS_SSL_HASH_SHA256 ); -#endif -#if defined(MBEDTLS_SHA512_C) - case MBEDTLS_MD_SHA384: - return( MBEDTLS_SSL_HASH_SHA384 ); - case MBEDTLS_MD_SHA512: - return( MBEDTLS_SSL_HASH_SHA512 ); -#endif - default: - return( MBEDTLS_SSL_HASH_NONE ); - } -} - -#if defined(MBEDTLS_ECP_C) -/* - * Check if a curve proposed by the peer is in our list. - * Return 0 if we're willing to use it, -1 otherwise. - */ -int mbedtls_ssl_check_curve( const mbedtls_ssl_context *ssl, mbedtls_ecp_group_id grp_id ) -{ - const mbedtls_ecp_group_id *gid; - - if( ssl->conf->curve_list == NULL ) - return( -1 ); - - for( gid = ssl->conf->curve_list; *gid != MBEDTLS_ECP_DP_NONE; gid++ ) - if( *gid == grp_id ) - return( 0 ); - - return( -1 ); -} -#endif /* MBEDTLS_ECP_C */ - -#if defined(MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED) -/* - * Check if a hash proposed by the peer is in our list. - * Return 0 if we're willing to use it, -1 otherwise. - */ -int mbedtls_ssl_check_sig_hash( const mbedtls_ssl_context *ssl, - mbedtls_md_type_t md ) -{ - const int *cur; - - if( ssl->conf->sig_hashes == NULL ) - return( -1 ); - - for( cur = ssl->conf->sig_hashes; *cur != MBEDTLS_MD_NONE; cur++ ) - if( *cur == (int) md ) - return( 0 ); - - return( -1 ); -} -#endif /* MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED */ - -#if defined(MBEDTLS_X509_CRT_PARSE_C) -int mbedtls_ssl_check_cert_usage( const mbedtls_x509_crt *cert, - const mbedtls_ssl_ciphersuite_t *ciphersuite, - int cert_endpoint, - uint32_t *flags ) -{ - int ret = 0; -#if defined(MBEDTLS_X509_CHECK_KEY_USAGE) - int usage = 0; -#endif -#if defined(MBEDTLS_X509_CHECK_EXTENDED_KEY_USAGE) - const char *ext_oid; - size_t ext_len; -#endif - -#if !defined(MBEDTLS_X509_CHECK_KEY_USAGE) && \ - !defined(MBEDTLS_X509_CHECK_EXTENDED_KEY_USAGE) - ((void) cert); - ((void) cert_endpoint); - ((void) flags); -#endif - -#if defined(MBEDTLS_X509_CHECK_KEY_USAGE) - if( cert_endpoint == MBEDTLS_SSL_IS_SERVER ) - { - /* Server part of the key exchange */ - switch( ciphersuite->key_exchange ) - { - case MBEDTLS_KEY_EXCHANGE_RSA: - case MBEDTLS_KEY_EXCHANGE_RSA_PSK: - usage = MBEDTLS_X509_KU_KEY_ENCIPHERMENT; - break; - - case MBEDTLS_KEY_EXCHANGE_DHE_RSA: - case MBEDTLS_KEY_EXCHANGE_ECDHE_RSA: - case MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA: - usage = MBEDTLS_X509_KU_DIGITAL_SIGNATURE; - break; - - case MBEDTLS_KEY_EXCHANGE_ECDH_RSA: - case MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA: - usage = MBEDTLS_X509_KU_KEY_AGREEMENT; - break; - - /* Don't use default: we want warnings when adding new values */ - case MBEDTLS_KEY_EXCHANGE_NONE: - case MBEDTLS_KEY_EXCHANGE_PSK: - case MBEDTLS_KEY_EXCHANGE_DHE_PSK: - case MBEDTLS_KEY_EXCHANGE_ECDHE_PSK: - case MBEDTLS_KEY_EXCHANGE_ECJPAKE: - usage = 0; - } - } - else - { - /* Client auth: we only implement rsa_sign and mbedtls_ecdsa_sign for now */ - usage = MBEDTLS_X509_KU_DIGITAL_SIGNATURE; - } - - if( mbedtls_x509_crt_check_key_usage( cert, usage ) != 0 ) - { - *flags |= MBEDTLS_X509_BADCERT_KEY_USAGE; - ret = -1; - } -#else - ((void) ciphersuite); -#endif /* MBEDTLS_X509_CHECK_KEY_USAGE */ - -#if defined(MBEDTLS_X509_CHECK_EXTENDED_KEY_USAGE) - if( cert_endpoint == MBEDTLS_SSL_IS_SERVER ) - { - ext_oid = MBEDTLS_OID_SERVER_AUTH; - ext_len = MBEDTLS_OID_SIZE( MBEDTLS_OID_SERVER_AUTH ); - } - else - { - ext_oid = MBEDTLS_OID_CLIENT_AUTH; - ext_len = MBEDTLS_OID_SIZE( MBEDTLS_OID_CLIENT_AUTH ); - } - - if( mbedtls_x509_crt_check_extended_key_usage( cert, ext_oid, ext_len ) != 0 ) - { - *flags |= MBEDTLS_X509_BADCERT_EXT_KEY_USAGE; - ret = -1; - } -#endif /* MBEDTLS_X509_CHECK_EXTENDED_KEY_USAGE */ - - return( ret ); -} -#endif /* MBEDTLS_X509_CRT_PARSE_C */ - -int mbedtls_ssl_set_calc_verify_md( mbedtls_ssl_context *ssl, int md ) -{ -#if defined(MBEDTLS_SSL_PROTO_TLS1_2) - if( ssl->minor_ver != MBEDTLS_SSL_MINOR_VERSION_3 ) - return MBEDTLS_ERR_SSL_INVALID_VERIFY_HASH; - - switch( md ) - { -#if defined(MBEDTLS_SSL_PROTO_TLS1) || defined(MBEDTLS_SSL_PROTO_TLS1_1) -#if defined(MBEDTLS_MD5_C) - case MBEDTLS_SSL_HASH_MD5: - return MBEDTLS_ERR_SSL_INVALID_VERIFY_HASH; -#endif -#if defined(MBEDTLS_SHA1_C) - case MBEDTLS_SSL_HASH_SHA1: - ssl->handshake->calc_verify = ssl_calc_verify_tls; - break; -#endif -#endif /* MBEDTLS_SSL_PROTO_TLS1 || MBEDTLS_SSL_PROTO_TLS1_1 */ -#if defined(MBEDTLS_SHA512_C) - case MBEDTLS_SSL_HASH_SHA384: - ssl->handshake->calc_verify = ssl_calc_verify_tls_sha384; - break; -#endif -#if defined(MBEDTLS_SHA256_C) - case MBEDTLS_SSL_HASH_SHA256: - ssl->handshake->calc_verify = ssl_calc_verify_tls_sha256; - break; -#endif - default: - return MBEDTLS_ERR_SSL_INVALID_VERIFY_HASH; - } - - return 0; -#else /* !MBEDTLS_SSL_PROTO_TLS1_2 */ - (void) ssl; - (void) md; - - return MBEDTLS_ERR_SSL_INVALID_VERIFY_HASH; -#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */ -} - -#if defined(MBEDTLS_SSL_PROTO_SSL3) || defined(MBEDTLS_SSL_PROTO_TLS1) || \ - defined(MBEDTLS_SSL_PROTO_TLS1_1) -int mbedtls_ssl_get_key_exchange_md_ssl_tls( mbedtls_ssl_context *ssl, - unsigned char *output, - unsigned char *data, size_t data_len ) -{ - int ret = 0; - mbedtls_md5_context mbedtls_md5; - mbedtls_sha1_context mbedtls_sha1; - - mbedtls_md5_init( &mbedtls_md5 ); - mbedtls_sha1_init( &mbedtls_sha1 ); - - /* - * digitally-signed struct { - * opaque md5_hash[16]; - * opaque sha_hash[20]; - * }; - * - * md5_hash - * MD5(ClientHello.random + ServerHello.random - * + ServerParams); - * sha_hash - * SHA(ClientHello.random + ServerHello.random - * + ServerParams); - */ - if( ( ret = mbedtls_md5_starts_ret( &mbedtls_md5 ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_md5_starts_ret", ret ); - goto exit; - } - if( ( ret = mbedtls_md5_update_ret( &mbedtls_md5, - ssl->handshake->randbytes, 64 ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_md5_update_ret", ret ); - goto exit; - } - if( ( ret = mbedtls_md5_update_ret( &mbedtls_md5, data, data_len ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_md5_update_ret", ret ); - goto exit; - } - if( ( ret = mbedtls_md5_finish_ret( &mbedtls_md5, output ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_md5_finish_ret", ret ); - goto exit; - } - - if( ( ret = mbedtls_sha1_starts_ret( &mbedtls_sha1 ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_sha1_starts_ret", ret ); - goto exit; - } - if( ( ret = mbedtls_sha1_update_ret( &mbedtls_sha1, - ssl->handshake->randbytes, 64 ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_sha1_update_ret", ret ); - goto exit; - } - if( ( ret = mbedtls_sha1_update_ret( &mbedtls_sha1, data, - data_len ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_sha1_update_ret", ret ); - goto exit; - } - if( ( ret = mbedtls_sha1_finish_ret( &mbedtls_sha1, - output + 16 ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_sha1_finish_ret", ret ); - goto exit; - } - -exit: - mbedtls_md5_free( &mbedtls_md5 ); - mbedtls_sha1_free( &mbedtls_sha1 ); - - if( ret != 0 ) - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_INTERNAL_ERROR ); - - return( ret ); - -} -#endif /* MBEDTLS_SSL_PROTO_SSL3 || MBEDTLS_SSL_PROTO_TLS1 || \ - MBEDTLS_SSL_PROTO_TLS1_1 */ - -#if defined(MBEDTLS_SSL_PROTO_TLS1) || defined(MBEDTLS_SSL_PROTO_TLS1_1) || \ - defined(MBEDTLS_SSL_PROTO_TLS1_2) - -#if defined(MBEDTLS_USE_PSA_CRYPTO) -int mbedtls_ssl_get_key_exchange_md_tls1_2( mbedtls_ssl_context *ssl, - unsigned char *hash, size_t *hashlen, - unsigned char *data, size_t data_len, - mbedtls_md_type_t md_alg ) -{ - psa_status_t status; - psa_hash_operation_t hash_operation = PSA_HASH_OPERATION_INIT; - psa_algorithm_t hash_alg = mbedtls_psa_translate_md( md_alg ); - - MBEDTLS_SSL_DEBUG_MSG( 3, ( "Perform PSA-based computation of digest of ServerKeyExchange" ) ); - - if( ( status = psa_hash_setup( &hash_operation, - hash_alg ) ) != PSA_SUCCESS ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "psa_hash_setup", status ); - goto exit; - } - - if( ( status = psa_hash_update( &hash_operation, ssl->handshake->randbytes, - 64 ) ) != PSA_SUCCESS ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "psa_hash_update", status ); - goto exit; - } - - if( ( status = psa_hash_update( &hash_operation, - data, data_len ) ) != PSA_SUCCESS ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "psa_hash_update", status ); - goto exit; - } - - if( ( status = psa_hash_finish( &hash_operation, hash, MBEDTLS_MD_MAX_SIZE, - hashlen ) ) != PSA_SUCCESS ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "psa_hash_finish", status ); - goto exit; - } - -exit: - if( status != PSA_SUCCESS ) - { - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_INTERNAL_ERROR ); - switch( status ) - { - case PSA_ERROR_NOT_SUPPORTED: - return( MBEDTLS_ERR_MD_FEATURE_UNAVAILABLE ); - case PSA_ERROR_BAD_STATE: /* Intentional fallthrough */ - case PSA_ERROR_BUFFER_TOO_SMALL: - return( MBEDTLS_ERR_MD_BAD_INPUT_DATA ); - case PSA_ERROR_INSUFFICIENT_MEMORY: - return( MBEDTLS_ERR_MD_ALLOC_FAILED ); - default: - return( MBEDTLS_ERR_MD_HW_ACCEL_FAILED ); - } - } - return( 0 ); -} - -#else - -int mbedtls_ssl_get_key_exchange_md_tls1_2( mbedtls_ssl_context *ssl, - unsigned char *hash, size_t *hashlen, - unsigned char *data, size_t data_len, - mbedtls_md_type_t md_alg ) -{ - int ret = 0; - mbedtls_md_context_t ctx; - const mbedtls_md_info_t *md_info = mbedtls_md_info_from_type( md_alg ); - *hashlen = mbedtls_md_get_size( md_info ); - - MBEDTLS_SSL_DEBUG_MSG( 3, ( "Perform mbedtls-based computation of digest of ServerKeyExchange" ) ); - - mbedtls_md_init( &ctx ); - - /* - * digitally-signed struct { - * opaque client_random[32]; - * opaque server_random[32]; - * ServerDHParams params; - * }; - */ - if( ( ret = mbedtls_md_setup( &ctx, md_info, 0 ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_md_setup", ret ); - goto exit; - } - if( ( ret = mbedtls_md_starts( &ctx ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_md_starts", ret ); - goto exit; - } - if( ( ret = mbedtls_md_update( &ctx, ssl->handshake->randbytes, 64 ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_md_update", ret ); - goto exit; - } - if( ( ret = mbedtls_md_update( &ctx, data, data_len ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_md_update", ret ); - goto exit; - } - if( ( ret = mbedtls_md_finish( &ctx, hash ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_md_finish", ret ); - goto exit; - } - -exit: - mbedtls_md_free( &ctx ); - - if( ret != 0 ) - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_INTERNAL_ERROR ); - - return( ret ); -} -#endif /* MBEDTLS_USE_PSA_CRYPTO */ - -#endif /* MBEDTLS_SSL_PROTO_TLS1 || MBEDTLS_SSL_PROTO_TLS1_1 || \ - MBEDTLS_SSL_PROTO_TLS1_2 */ - #endif /* MBEDTLS_SSL_TLS_C */ diff --git a/library/ssl_12_srv.c b/library/ssl_12_srv.c index b0b09cd97..b2ad726ea 100644 --- a/library/ssl_12_srv.c +++ b/library/ssl_12_srv.c @@ -1,5 +1,6 @@ /* - * SSLv3/TLSv1 server-side functions + * Server-specific handshake reading/writing functions + * for TLS versions <= 1.2. * * Copyright (C) 2006-2015, ARM Limited, All Rights Reserved * SPDX-License-Identifier: Apache-2.0 @@ -51,35 +52,157 @@ #include "mbedtls/platform_time.h" #endif -#if defined(MBEDTLS_SSL_DTLS_HELLO_VERIFY) -int mbedtls_ssl_set_client_transport_id( mbedtls_ssl_context *ssl, - const unsigned char *info, - size_t ilen ) +/* Forward declarations for state-specific handshake functions. */ +static int ssl_parse_client_hello( mbedtls_ssl_context *ssl ); +#if defined(MBEDTLS_SSL_PROTO_DTLS) +static int ssl_write_hello_verify_request( mbedtls_ssl_context *ssl ); +#endif /* MBEDTLS_SSL_PROTO_DTLS */ +static int ssl_write_server_hello( mbedtls_ssl_context *ssl ); +static int ssl_write_certificate_request( mbedtls_ssl_context *ssl ); +static int ssl_write_server_key_exchange( mbedtls_ssl_context *ssl ); +static int ssl_write_server_hello_done( mbedtls_ssl_context *ssl ); +static int ssl_parse_client_key_exchange( mbedtls_ssl_context *ssl ); +static int ssl_parse_certificate_verify( mbedtls_ssl_context *ssl ); +#if defined(MBEDTLS_SSL_SESSION_TICKETS) +static int ssl_write_new_session_ticket( mbedtls_ssl_context *ssl ); +#endif /* MBEDTLS_SSL_SESSION_TICKETS */ + +/* + * Server-side handshake state machine + * + * This function performs a single step in a server-side TLS <= 1.2 handshake. + */ +int mbedtls_ssl_handshake_server_step( mbedtls_ssl_context *ssl ) { - if( ssl->conf->endpoint != MBEDTLS_SSL_IS_SERVER ) + int ret = 0; + + if( ssl->state == MBEDTLS_SSL_HANDSHAKE_OVER || ssl->handshake == NULL ) return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); - mbedtls_free( ssl->cli_id ); + MBEDTLS_SSL_DEBUG_MSG( 2, ( "server state: %d", ssl->state ) ); - if( ( ssl->cli_id = mbedtls_calloc( 1, ilen ) ) == NULL ) - return( MBEDTLS_ERR_SSL_ALLOC_FAILED ); + if( ( ret = mbedtls_ssl_flush_output( ssl ) ) != 0 ) + return( ret ); - memcpy( ssl->cli_id, info, ilen ); - ssl->cli_id_len = ilen; +#if defined(MBEDTLS_SSL_PROTO_DTLS) + if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM && + ssl->handshake->retransmit_state == MBEDTLS_SSL_RETRANS_SENDING ) + { + if( ( ret = mbedtls_ssl_flight_transmit( ssl ) ) != 0 ) + return( ret ); + } +#endif /* MBEDTLS_SSL_PROTO_DTLS */ - return( 0 ); + switch( ssl->state ) + { + case MBEDTLS_SSL_HELLO_REQUEST: + ssl->state = MBEDTLS_SSL_CLIENT_HELLO; + break; + + /* + * <== ClientHello + */ + case MBEDTLS_SSL_CLIENT_HELLO: + ret = ssl_parse_client_hello( ssl ); + break; + +#if defined(MBEDTLS_SSL_PROTO_DTLS) + case MBEDTLS_SSL_SERVER_HELLO_VERIFY_REQUEST_SENT: + return( MBEDTLS_ERR_SSL_HELLO_VERIFY_REQUIRED ); +#endif + + /* + * ==> ServerHello + * Certificate + * ( ServerKeyExchange ) + * ( CertificateRequest ) + * ServerHelloDone + */ + case MBEDTLS_SSL_SERVER_HELLO: + ret = ssl_write_server_hello( ssl ); + break; + + case MBEDTLS_SSL_SERVER_CERTIFICATE: + ret = mbedtls_ssl_write_certificate( ssl ); + break; + + case MBEDTLS_SSL_SERVER_KEY_EXCHANGE: + ret = ssl_write_server_key_exchange( ssl ); + break; + + case MBEDTLS_SSL_CERTIFICATE_REQUEST: + ret = ssl_write_certificate_request( ssl ); + break; + + case MBEDTLS_SSL_SERVER_HELLO_DONE: + ret = ssl_write_server_hello_done( ssl ); + break; + + /* + * <== ( Certificate/Alert ) + * ClientKeyExchange + * ( CertificateVerify ) + * ChangeCipherSpec + * Finished + */ + case MBEDTLS_SSL_CLIENT_CERTIFICATE: + ret = mbedtls_ssl_parse_certificate( ssl ); + break; + + case MBEDTLS_SSL_CLIENT_KEY_EXCHANGE: + ret = ssl_parse_client_key_exchange( ssl ); + break; + + case MBEDTLS_SSL_CERTIFICATE_VERIFY: + ret = ssl_parse_certificate_verify( ssl ); + break; + + case MBEDTLS_SSL_CLIENT_CHANGE_CIPHER_SPEC: + ret = mbedtls_ssl_parse_change_cipher_spec( ssl ); + break; + + case MBEDTLS_SSL_CLIENT_FINISHED: + ret = mbedtls_ssl_parse_finished( ssl ); + break; + + /* + * ==> ( NewSessionTicket ) + * ChangeCipherSpec + * Finished + */ + case MBEDTLS_SSL_SERVER_CHANGE_CIPHER_SPEC: +#if defined(MBEDTLS_SSL_SESSION_TICKETS) + if( ssl->handshake->new_session_ticket != 0 ) + ret = ssl_write_new_session_ticket( ssl ); + else +#endif + ret = mbedtls_ssl_write_change_cipher_spec( ssl ); + break; + + case MBEDTLS_SSL_SERVER_FINISHED: + ret = mbedtls_ssl_write_finished( ssl ); + break; + + case MBEDTLS_SSL_FLUSH_BUFFERS: + MBEDTLS_SSL_DEBUG_MSG( 2, ( "handshake: done" ) ); + ssl->state = MBEDTLS_SSL_HANDSHAKE_WRAPUP; + break; + + case MBEDTLS_SSL_HANDSHAKE_WRAPUP: + mbedtls_ssl_handshake_wrapup( ssl ); + break; + + default: + MBEDTLS_SSL_DEBUG_MSG( 1, ( "invalid state %d", ssl->state ) ); + return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); + } + + return( ret ); } -void mbedtls_ssl_conf_dtls_cookies( mbedtls_ssl_config *conf, - mbedtls_ssl_cookie_write_t *f_cookie_write, - mbedtls_ssl_cookie_check_t *f_cookie_check, - void *p_cookie ) -{ - conf->f_cookie_write = f_cookie_write; - conf->f_cookie_check = f_cookie_check; - conf->p_cookie = p_cookie; -} -#endif /* MBEDTLS_SSL_DTLS_HELLO_VERIFY */ +/* + * ClientHello/ServerHello extension functions. + */ #if defined(MBEDTLS_SSL_SERVER_NAME_INDICATION) static int ssl_parse_servername_ext( mbedtls_ssl_context *ssl, @@ -150,87 +273,8 @@ static int ssl_parse_servername_ext( mbedtls_ssl_context *ssl, } #endif /* MBEDTLS_SSL_SERVER_NAME_INDICATION */ -#if defined(MBEDTLS_KEY_EXCHANGE__SOME__PSK_ENABLED) -static int ssl_conf_has_psk_or_cb( mbedtls_ssl_config const *conf ) -{ - if( conf->f_psk != NULL ) - return( 1 ); - - if( conf->psk_identity_len == 0 || conf->psk_identity == NULL ) - return( 0 ); - - if( conf->psk != NULL && conf->psk_len != 0 ) - return( 1 ); - -#if defined(MBEDTLS_USE_PSA_CRYPTO) - if( conf->psk_opaque != 0 ) - return( 1 ); -#endif /* MBEDTLS_USE_PSA_CRYPTO */ - - return( 0 ); -} - -#if defined(MBEDTLS_USE_PSA_CRYPTO) -static int ssl_use_opaque_psk( mbedtls_ssl_context const *ssl ) -{ - if( ssl->conf->f_psk != NULL ) - { - /* If we've used a callback to select the PSK, - * the static configuration is irrelevant. */ - - if( ssl->handshake->psk_opaque != 0 ) - return( 1 ); - - return( 0 ); - } - - if( ssl->conf->psk_opaque != 0 ) - return( 1 ); - - return( 0 ); -} -#endif /* MBEDTLS_USE_PSA_CRYPTO */ -#endif /* MBEDTLS_KEY_EXCHANGE__SOME__PSK_ENABLED */ - -static int ssl_parse_renegotiation_info( mbedtls_ssl_context *ssl, - const unsigned char *buf, - size_t len ) -{ -#if defined(MBEDTLS_SSL_RENEGOTIATION) - if( ssl->renego_status != MBEDTLS_SSL_INITIAL_HANDSHAKE ) - { - /* Check verify-data in constant-time. The length OTOH is no secret */ - if( len != 1 + ssl->verify_data_len || - buf[0] != ssl->verify_data_len || - mbedtls_ssl_safer_memcmp( buf + 1, ssl->peer_verify_data, - ssl->verify_data_len ) != 0 ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "non-matching renegotiation info" ) ); - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE ); - return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO ); - } - } - else -#endif /* MBEDTLS_SSL_RENEGOTIATION */ - { - if( len != 1 || buf[0] != 0x0 ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "non-zero length renegotiation info" ) ); - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE ); - return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO ); - } - - ssl->secure_renegotiation = MBEDTLS_SSL_SECURE_RENEGOTIATION; - } - - return( 0 ); -} - #if defined(MBEDTLS_SSL_PROTO_TLS1_2) && \ defined(MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED) - /* * Status of the implementation of signature-algorithms extension: * @@ -319,6 +363,82 @@ static int ssl_parse_signature_algorithms_ext( mbedtls_ssl_context *ssl, #endif /* MBEDTLS_SSL_PROTO_TLS1_2 && MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED */ +static void ssl_write_renegotiation_ext( mbedtls_ssl_context *ssl, + unsigned char *buf, + size_t *olen ) +{ + unsigned char *p = buf; + + if( ssl->secure_renegotiation != MBEDTLS_SSL_SECURE_RENEGOTIATION ) + { + *olen = 0; + return; + } + + MBEDTLS_SSL_DEBUG_MSG( 3, ( "server hello, secure renegotiation extension" ) ); + + *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_RENEGOTIATION_INFO >> 8 ) & 0xFF ); + *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_RENEGOTIATION_INFO ) & 0xFF ); + +#if defined(MBEDTLS_SSL_RENEGOTIATION) + if( ssl->renego_status != MBEDTLS_SSL_INITIAL_HANDSHAKE ) + { + *p++ = 0x00; + *p++ = ( ssl->verify_data_len * 2 + 1 ) & 0xFF; + *p++ = ssl->verify_data_len * 2 & 0xFF; + + memcpy( p, ssl->peer_verify_data, ssl->verify_data_len ); + p += ssl->verify_data_len; + memcpy( p, ssl->own_verify_data, ssl->verify_data_len ); + p += ssl->verify_data_len; + } + else +#endif /* MBEDTLS_SSL_RENEGOTIATION */ + { + *p++ = 0x00; + *p++ = 0x01; + *p++ = 0x00; + } + + *olen = p - buf; +} + +static int ssl_parse_renegotiation_info( mbedtls_ssl_context *ssl, + const unsigned char *buf, + size_t len ) +{ +#if defined(MBEDTLS_SSL_RENEGOTIATION) + if( ssl->renego_status != MBEDTLS_SSL_INITIAL_HANDSHAKE ) + { + /* Check verify-data in constant-time. The length OTOH is no secret */ + if( len != 1 + ssl->verify_data_len || + buf[0] != ssl->verify_data_len || + mbedtls_ssl_safer_memcmp( buf + 1, ssl->peer_verify_data, + ssl->verify_data_len ) != 0 ) + { + MBEDTLS_SSL_DEBUG_MSG( 1, ( "non-matching renegotiation info" ) ); + mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, + MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE ); + return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO ); + } + } + else +#endif /* MBEDTLS_SSL_RENEGOTIATION */ + { + if( len != 1 || buf[0] != 0x0 ) + { + MBEDTLS_SSL_DEBUG_MSG( 1, ( "non-zero length renegotiation info" ) ); + mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, + MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE ); + return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO ); + } + + ssl->secure_renegotiation = MBEDTLS_SSL_SECURE_RENEGOTIATION; + } + + return( 0 ); +} + #if defined(MBEDTLS_ECDH_C) || defined(MBEDTLS_ECDSA_C) || \ defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED) static int ssl_parse_supported_elliptic_curves( mbedtls_ssl_context *ssl, @@ -387,6 +507,34 @@ static int ssl_parse_supported_elliptic_curves( mbedtls_ssl_context *ssl, return( 0 ); } +static void ssl_write_supported_point_formats_ext( mbedtls_ssl_context *ssl, + unsigned char *buf, + size_t *olen ) +{ + unsigned char *p = buf; + ((void) ssl); + + if( ( ssl->handshake->cli_exts & + MBEDTLS_TLS_EXT_SUPPORTED_POINT_FORMATS_PRESENT ) == 0 ) + { + *olen = 0; + return; + } + + MBEDTLS_SSL_DEBUG_MSG( 3, ( "server hello, supported_point_formats extension" ) ); + + *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_SUPPORTED_POINT_FORMATS >> 8 ) & 0xFF ); + *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_SUPPORTED_POINT_FORMATS ) & 0xFF ); + + *p++ = 0x00; + *p++ = 2; + + *p++ = 1; + *p++ = MBEDTLS_ECP_PF_UNCOMPRESSED; + + *olen = 6; +} + static int ssl_parse_supported_point_formats( mbedtls_ssl_context *ssl, const unsigned char *buf, size_t len ) @@ -428,36 +576,32 @@ static int ssl_parse_supported_point_formats( mbedtls_ssl_context *ssl, #endif /* MBEDTLS_ECDH_C || MBEDTLS_ECDSA_C || MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED */ -#if defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED) -static int ssl_parse_ecjpake_kkpp( mbedtls_ssl_context *ssl, - const unsigned char *buf, - size_t len ) -{ - int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; - - if( mbedtls_ecjpake_check( &ssl->handshake->ecjpake_ctx ) != 0 ) - { - MBEDTLS_SSL_DEBUG_MSG( 3, ( "skip ecjpake kkpp extension" ) ); - return( 0 ); - } - - if( ( ret = mbedtls_ecjpake_read_round_one( &ssl->handshake->ecjpake_ctx, - buf, len ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ecjpake_read_round_one", ret ); - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_ILLEGAL_PARAMETER ); - return( ret ); - } - - /* Only mark the extension as OK when we're sure it is */ - ssl->handshake->cli_exts |= MBEDTLS_TLS_EXT_ECJPAKE_KKPP_OK; - - return( 0 ); -} -#endif /* MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED */ - #if defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH) +static void ssl_write_max_fragment_length_ext( mbedtls_ssl_context *ssl, + unsigned char *buf, + size_t *olen ) +{ + unsigned char *p = buf; + + if( ssl->session_negotiate->mfl_code == MBEDTLS_SSL_MAX_FRAG_LEN_NONE ) + { + *olen = 0; + return; + } + + MBEDTLS_SSL_DEBUG_MSG( 3, ( "server hello, max_fragment_length extension" ) ); + + *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_MAX_FRAGMENT_LENGTH >> 8 ) & 0xFF ); + *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_MAX_FRAGMENT_LENGTH ) & 0xFF ); + + *p++ = 0x00; + *p++ = 1; + + *p++ = ssl->session_negotiate->mfl_code; + + *olen = 5; +} + static int ssl_parse_max_fragment_length_ext( mbedtls_ssl_context *ssl, const unsigned char *buf, size_t len ) @@ -477,6 +621,52 @@ static int ssl_parse_max_fragment_length_ext( mbedtls_ssl_context *ssl, #endif /* MBEDTLS_SSL_MAX_FRAGMENT_LENGTH */ #if defined(MBEDTLS_SSL_DTLS_CONNECTION_ID) +static void ssl_write_cid_ext( mbedtls_ssl_context *ssl, + unsigned char *buf, + size_t *olen ) +{ + unsigned char *p = buf; + size_t ext_len; + const unsigned char *end = ssl->out_msg + MBEDTLS_SSL_OUT_CONTENT_LEN; + + *olen = 0; + + /* Skip writing the extension if we don't want to use it or if + * the client hasn't offered it. */ + if( ssl->handshake->cid_in_use == MBEDTLS_SSL_CID_DISABLED ) + return; + + /* ssl->own_cid_len is at most MBEDTLS_SSL_CID_IN_LEN_MAX + * which is at most 255, so the increment cannot overflow. */ + if( end < p || (size_t)( end - p ) < (unsigned)( ssl->own_cid_len + 5 ) ) + { + MBEDTLS_SSL_DEBUG_MSG( 1, ( "buffer too small" ) ); + return; + } + + MBEDTLS_SSL_DEBUG_MSG( 3, ( "server hello, adding CID extension" ) ); + + /* + * Quoting draft-ietf-tls-dtls-connection-id-05 + * https://tools.ietf.org/html/draft-ietf-tls-dtls-connection-id-05 + * + * struct { + * opaque cid<0..2^8-1>; + * } ConnectionId; + */ + + *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_CID >> 8 ) & 0xFF ); + *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_CID ) & 0xFF ); + ext_len = (size_t) ssl->own_cid_len + 1; + *p++ = (unsigned char)( ( ext_len >> 8 ) & 0xFF ); + *p++ = (unsigned char)( ( ext_len ) & 0xFF ); + + *p++ = (uint8_t) ssl->own_cid_len; + memcpy( p, ssl->own_cid, ssl->own_cid_len ); + + *olen = ssl->own_cid_len + 5; +} + static int ssl_parse_cid_ext( mbedtls_ssl_context *ssl, const unsigned char *buf, size_t len ) @@ -549,6 +739,29 @@ static int ssl_parse_cid_ext( mbedtls_ssl_context *ssl, #endif /* MBEDTLS_SSL_DTLS_CONNECTION_ID */ #if defined(MBEDTLS_SSL_TRUNCATED_HMAC) +static void ssl_write_truncated_hmac_ext( mbedtls_ssl_context *ssl, + unsigned char *buf, + size_t *olen ) +{ + unsigned char *p = buf; + + if( ssl->session_negotiate->trunc_hmac == MBEDTLS_SSL_TRUNC_HMAC_DISABLED ) + { + *olen = 0; + return; + } + + MBEDTLS_SSL_DEBUG_MSG( 3, ( "server hello, adding truncated hmac extension" ) ); + + *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_TRUNCATED_HMAC >> 8 ) & 0xFF ); + *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_TRUNCATED_HMAC ) & 0xFF ); + + *p++ = 0x00; + *p++ = 0x00; + + *olen = 4; +} + static int ssl_parse_truncated_hmac_ext( mbedtls_ssl_context *ssl, const unsigned char *buf, size_t len ) @@ -570,32 +783,32 @@ static int ssl_parse_truncated_hmac_ext( mbedtls_ssl_context *ssl, } #endif /* MBEDTLS_SSL_TRUNCATED_HMAC */ -#if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC) -static int ssl_parse_encrypt_then_mac_ext( mbedtls_ssl_context *ssl, - const unsigned char *buf, - size_t len ) -{ - if( len != 0 ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) ); - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR ); - return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO ); - } - - ((void) buf); - - if( ssl->conf->encrypt_then_mac == MBEDTLS_SSL_ETM_ENABLED && - ssl->minor_ver != MBEDTLS_SSL_MINOR_VERSION_0 ) - { - ssl->session_negotiate->encrypt_then_mac = MBEDTLS_SSL_ETM_ENABLED; - } - - return( 0 ); -} -#endif /* MBEDTLS_SSL_ENCRYPT_THEN_MAC */ - #if defined(MBEDTLS_SSL_EXTENDED_MASTER_SECRET) +static void ssl_write_extended_ms_ext( mbedtls_ssl_context *ssl, + unsigned char *buf, + size_t *olen ) +{ + unsigned char *p = buf; + + if( ssl->handshake->extended_ms == MBEDTLS_SSL_EXTENDED_MS_DISABLED || + ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 ) + { + *olen = 0; + return; + } + + MBEDTLS_SSL_DEBUG_MSG( 3, ( "server hello, adding extended master secret " + "extension" ) ); + + *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_EXTENDED_MASTER_SECRET >> 8 ) & 0xFF ); + *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_EXTENDED_MASTER_SECRET ) & 0xFF ); + + *p++ = 0x00; + *p++ = 0x00; + + *olen = 4; +} + static int ssl_parse_extended_ms_ext( mbedtls_ssl_context *ssl, const unsigned char *buf, size_t len ) @@ -620,81 +833,107 @@ static int ssl_parse_extended_ms_ext( mbedtls_ssl_context *ssl, } #endif /* MBEDTLS_SSL_EXTENDED_MASTER_SECRET */ -#if defined(MBEDTLS_SSL_SESSION_TICKETS) -static int ssl_parse_session_ticket_ext( mbedtls_ssl_context *ssl, - unsigned char *buf, - size_t len ) +#if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC) +static void ssl_write_encrypt_then_mac_ext( mbedtls_ssl_context *ssl, + unsigned char *buf, + size_t *olen ) { - int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; - mbedtls_ssl_session session; + unsigned char *p = buf; + const mbedtls_ssl_ciphersuite_t *suite = NULL; + const mbedtls_cipher_info_t *cipher = NULL; - mbedtls_ssl_session_init( &session ); - - if( ssl->conf->f_ticket_parse == NULL || - ssl->conf->f_ticket_write == NULL ) + if( ssl->session_negotiate->encrypt_then_mac == MBEDTLS_SSL_ETM_DISABLED || + ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 ) { - return( 0 ); - } - - /* Remember the client asked us to send a new ticket */ - ssl->handshake->new_session_ticket = 1; - - MBEDTLS_SSL_DEBUG_MSG( 3, ( "ticket length: %d", len ) ); - - if( len == 0 ) - return( 0 ); - -#if defined(MBEDTLS_SSL_RENEGOTIATION) - if( ssl->renego_status != MBEDTLS_SSL_INITIAL_HANDSHAKE ) - { - MBEDTLS_SSL_DEBUG_MSG( 3, ( "ticket rejected: renegotiating" ) ); - return( 0 ); - } -#endif /* MBEDTLS_SSL_RENEGOTIATION */ - - /* - * Failures are ok: just ignore the ticket and proceed. - */ - if( ( ret = ssl->conf->f_ticket_parse( ssl->conf->p_ticket, &session, - buf, len ) ) != 0 ) - { - mbedtls_ssl_session_free( &session ); - - if( ret == MBEDTLS_ERR_SSL_INVALID_MAC ) - MBEDTLS_SSL_DEBUG_MSG( 3, ( "ticket is not authentic" ) ); - else if( ret == MBEDTLS_ERR_SSL_SESSION_TICKET_EXPIRED ) - MBEDTLS_SSL_DEBUG_MSG( 3, ( "ticket is expired" ) ); - else - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_ticket_parse", ret ); - - return( 0 ); + *olen = 0; + return; } /* - * Keep the session ID sent by the client, since we MUST send it back to - * inform them we're accepting the ticket (RFC 5077 section 3.4) + * RFC 7366: "If a server receives an encrypt-then-MAC request extension + * from a client and then selects a stream or Authenticated Encryption + * with Associated Data (AEAD) ciphersuite, it MUST NOT send an + * encrypt-then-MAC response extension back to the client." */ - session.id_len = ssl->session_negotiate->id_len; - memcpy( &session.id, ssl->session_negotiate->id, session.id_len ); + if( ( suite = mbedtls_ssl_ciphersuite_from_id( + ssl->session_negotiate->ciphersuite ) ) == NULL || + ( cipher = mbedtls_cipher_info_from_type( suite->cipher ) ) == NULL || + cipher->mode != MBEDTLS_MODE_CBC ) + { + *olen = 0; + return; + } - mbedtls_ssl_session_free( ssl->session_negotiate ); - memcpy( ssl->session_negotiate, &session, sizeof( mbedtls_ssl_session ) ); + MBEDTLS_SSL_DEBUG_MSG( 3, ( "server hello, adding encrypt then mac extension" ) ); - /* Zeroize instead of free as we copied the content */ - mbedtls_platform_zeroize( &session, sizeof( mbedtls_ssl_session ) ); + *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_ENCRYPT_THEN_MAC >> 8 ) & 0xFF ); + *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_ENCRYPT_THEN_MAC ) & 0xFF ); - MBEDTLS_SSL_DEBUG_MSG( 3, ( "session successfully restored from ticket" ) ); + *p++ = 0x00; + *p++ = 0x00; - ssl->handshake->resume = 1; + *olen = 4; +} - /* Don't send a new ticket after all, this one is OK */ - ssl->handshake->new_session_ticket = 0; +static int ssl_parse_encrypt_then_mac_ext( mbedtls_ssl_context *ssl, + const unsigned char *buf, + size_t len ) +{ + if( len != 0 ) + { + MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) ); + mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, + MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR ); + return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO ); + } + + ((void) buf); + + if( ssl->conf->encrypt_then_mac == MBEDTLS_SSL_ETM_ENABLED && + ssl->minor_ver != MBEDTLS_SSL_MINOR_VERSION_0 ) + { + ssl->session_negotiate->encrypt_then_mac = MBEDTLS_SSL_ETM_ENABLED; + } return( 0 ); } -#endif /* MBEDTLS_SSL_SESSION_TICKETS */ +#endif /* MBEDTLS_SSL_ENCRYPT_THEN_MAC */ #if defined(MBEDTLS_SSL_ALPN) +static void ssl_write_alpn_ext( mbedtls_ssl_context *ssl, + unsigned char *buf, size_t *olen ) +{ + if( ssl->alpn_chosen == NULL ) + { + *olen = 0; + return; + } + + MBEDTLS_SSL_DEBUG_MSG( 3, ( "server hello, adding alpn extension" ) ); + + /* + * 0 . 1 ext identifier + * 2 . 3 ext length + * 4 . 5 protocol list length + * 6 . 6 protocol name length + * 7 . 7+n protocol name + */ + buf[0] = (unsigned char)( ( MBEDTLS_TLS_EXT_ALPN >> 8 ) & 0xFF ); + buf[1] = (unsigned char)( ( MBEDTLS_TLS_EXT_ALPN ) & 0xFF ); + + *olen = 7 + strlen( ssl->alpn_chosen ); + + buf[2] = (unsigned char)( ( ( *olen - 4 ) >> 8 ) & 0xFF ); + buf[3] = (unsigned char)( ( ( *olen - 4 ) ) & 0xFF ); + + buf[4] = (unsigned char)( ( ( *olen - 6 ) >> 8 ) & 0xFF ); + buf[5] = (unsigned char)( ( ( *olen - 6 ) ) & 0xFF ); + + buf[6] = (unsigned char)( ( ( *olen - 7 ) ) & 0xFF ); + + memcpy( buf + 7, ssl->alpn_chosen, *olen - 7 ); +} + static int ssl_parse_alpn_ext( mbedtls_ssl_context *ssl, const unsigned char *buf, size_t len ) { @@ -782,6 +1021,235 @@ static int ssl_parse_alpn_ext( mbedtls_ssl_context *ssl, } #endif /* MBEDTLS_SSL_ALPN */ +#if defined(MBEDTLS_SSL_SESSION_TICKETS) +static void ssl_write_session_ticket_ext( mbedtls_ssl_context *ssl, + unsigned char *buf, + size_t *olen ) +{ + unsigned char *p = buf; + + if( ssl->handshake->new_session_ticket == 0 ) + { + *olen = 0; + return; + } + + MBEDTLS_SSL_DEBUG_MSG( 3, ( "server hello, adding session ticket extension" ) ); + + *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_SESSION_TICKET >> 8 ) & 0xFF ); + *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_SESSION_TICKET ) & 0xFF ); + + *p++ = 0x00; + *p++ = 0x00; + + *olen = 4; +} + +static int ssl_parse_session_ticket_ext( mbedtls_ssl_context *ssl, + unsigned char *buf, + size_t len ) +{ + int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; + mbedtls_ssl_session session; + + mbedtls_ssl_session_init( &session ); + + if( ssl->conf->f_ticket_parse == NULL || + ssl->conf->f_ticket_write == NULL ) + { + return( 0 ); + } + + /* Remember the client asked us to send a new ticket */ + ssl->handshake->new_session_ticket = 1; + + MBEDTLS_SSL_DEBUG_MSG( 3, ( "ticket length: %d", len ) ); + + if( len == 0 ) + return( 0 ); + +#if defined(MBEDTLS_SSL_RENEGOTIATION) + if( ssl->renego_status != MBEDTLS_SSL_INITIAL_HANDSHAKE ) + { + MBEDTLS_SSL_DEBUG_MSG( 3, ( "ticket rejected: renegotiating" ) ); + return( 0 ); + } +#endif /* MBEDTLS_SSL_RENEGOTIATION */ + + /* + * Failures are ok: just ignore the ticket and proceed. + */ + if( ( ret = ssl->conf->f_ticket_parse( ssl->conf->p_ticket, &session, + buf, len ) ) != 0 ) + { + mbedtls_ssl_session_free( &session ); + + if( ret == MBEDTLS_ERR_SSL_INVALID_MAC ) + MBEDTLS_SSL_DEBUG_MSG( 3, ( "ticket is not authentic" ) ); + else if( ret == MBEDTLS_ERR_SSL_SESSION_TICKET_EXPIRED ) + MBEDTLS_SSL_DEBUG_MSG( 3, ( "ticket is expired" ) ); + else + MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_ticket_parse", ret ); + + return( 0 ); + } + + /* + * Keep the session ID sent by the client, since we MUST send it back to + * inform them we're accepting the ticket (RFC 5077 section 3.4) + */ + session.id_len = ssl->session_negotiate->id_len; + memcpy( &session.id, ssl->session_negotiate->id, session.id_len ); + + mbedtls_ssl_session_free( ssl->session_negotiate ); + memcpy( ssl->session_negotiate, &session, sizeof( mbedtls_ssl_session ) ); + + /* Zeroize instead of free as we copied the content */ + mbedtls_platform_zeroize( &session, sizeof( mbedtls_ssl_session ) ); + + MBEDTLS_SSL_DEBUG_MSG( 3, ( "session successfully restored from ticket" ) ); + + ssl->handshake->resume = 1; + + /* Don't send a new ticket after all, this one is OK */ + ssl->handshake->new_session_ticket = 0; + + return( 0 ); +} +#endif /* MBEDTLS_SSL_SESSION_TICKETS */ + +#if defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED) +static void ssl_write_ecjpake_kkpp_ext( mbedtls_ssl_context *ssl, + unsigned char *buf, + size_t *olen ) +{ + int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; + unsigned char *p = buf; + const unsigned char *end = ssl->out_msg + MBEDTLS_SSL_OUT_CONTENT_LEN; + size_t kkpp_len; + + *olen = 0; + + /* Skip costly computation if not needed */ + if( ssl->handshake->ciphersuite_info->key_exchange != + MBEDTLS_KEY_EXCHANGE_ECJPAKE ) + return; + + MBEDTLS_SSL_DEBUG_MSG( 3, ( "server hello, ecjpake kkpp extension" ) ); + + if( end - p < 4 ) + { + MBEDTLS_SSL_DEBUG_MSG( 1, ( "buffer too small" ) ); + return; + } + + *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_ECJPAKE_KKPP >> 8 ) & 0xFF ); + *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_ECJPAKE_KKPP ) & 0xFF ); + + ret = mbedtls_ecjpake_write_round_one( &ssl->handshake->ecjpake_ctx, + p + 2, end - p - 2, &kkpp_len, + ssl->conf->f_rng, ssl->conf->p_rng ); + if( ret != 0 ) + { + MBEDTLS_SSL_DEBUG_RET( 1 , "mbedtls_ecjpake_write_round_one", ret ); + return; + } + + *p++ = (unsigned char)( ( kkpp_len >> 8 ) & 0xFF ); + *p++ = (unsigned char)( ( kkpp_len ) & 0xFF ); + + *olen = kkpp_len + 4; +} + +static int ssl_parse_ecjpake_kkpp( mbedtls_ssl_context *ssl, + const unsigned char *buf, + size_t len ) +{ + int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; + + if( mbedtls_ecjpake_check( &ssl->handshake->ecjpake_ctx ) != 0 ) + { + MBEDTLS_SSL_DEBUG_MSG( 3, ( "skip ecjpake kkpp extension" ) ); + return( 0 ); + } + + if( ( ret = mbedtls_ecjpake_read_round_one( &ssl->handshake->ecjpake_ctx, + buf, len ) ) != 0 ) + { + MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ecjpake_read_round_one", ret ); + mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, + MBEDTLS_SSL_ALERT_MSG_ILLEGAL_PARAMETER ); + return( ret ); + } + + /* Only mark the extension as OK when we're sure it is */ + ssl->handshake->cli_exts |= MBEDTLS_TLS_EXT_ECJPAKE_KKPP_OK; + + return( 0 ); +} +#endif /* MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED */ + + + + + + + + + + + +#if defined(MBEDTLS_KEY_EXCHANGE__SOME__PSK_ENABLED) +static int ssl_conf_has_psk_or_cb( mbedtls_ssl_config const *conf ) +{ + if( conf->f_psk != NULL ) + return( 1 ); + + if( conf->psk_identity_len == 0 || conf->psk_identity == NULL ) + return( 0 ); + + if( conf->psk != NULL && conf->psk_len != 0 ) + return( 1 ); + +#if defined(MBEDTLS_USE_PSA_CRYPTO) + if( conf->psk_opaque != 0 ) + return( 1 ); +#endif /* MBEDTLS_USE_PSA_CRYPTO */ + + return( 0 ); +} + +#if defined(MBEDTLS_USE_PSA_CRYPTO) +static int ssl_use_opaque_psk( mbedtls_ssl_context const *ssl ) +{ + if( ssl->conf->f_psk != NULL ) + { + /* If we've used a callback to select the PSK, + * the static configuration is irrelevant. */ + + if( ssl->handshake->psk_opaque != 0 ) + return( 1 ); + + return( 0 ); + } + + if( ssl->conf->psk_opaque != 0 ) + return( 1 ); + + return( 0 ); +} +#endif /* MBEDTLS_USE_PSA_CRYPTO */ +#endif /* MBEDTLS_KEY_EXCHANGE__SOME__PSK_ENABLED */ + + + + + + + + + + /* * Auxiliary functions for ServerHello parsing and related actions */ @@ -912,385 +1380,16 @@ static int ssl_pick_cert( mbedtls_ssl_context *ssl, #endif /* MBEDTLS_X509_CRT_PARSE_C */ /* - * Check if a given ciphersuite is suitable for use with our config/keys/etc - * Sets ciphersuite_info only if the suite matches. + * SERVER HANDSHAKE STATE: Incoming `ClientHello` */ -static int ssl_ciphersuite_match( mbedtls_ssl_context *ssl, int suite_id, - const mbedtls_ssl_ciphersuite_t **ciphersuite_info ) -{ - const mbedtls_ssl_ciphersuite_t *suite_info; - -#if defined(MBEDTLS_SSL_PROTO_TLS1_2) && \ - defined(MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED) - mbedtls_pk_type_t sig_type; -#endif - - suite_info = mbedtls_ssl_ciphersuite_from_id( suite_id ); - if( suite_info == NULL ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) ); - return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); - } - - MBEDTLS_SSL_DEBUG_MSG( 3, ( "trying ciphersuite: %s", suite_info->name ) ); - - if( suite_info->min_minor_ver > ssl->minor_ver || - suite_info->max_minor_ver < ssl->minor_ver ) - { - MBEDTLS_SSL_DEBUG_MSG( 3, ( "ciphersuite mismatch: version" ) ); - return( 0 ); - } - -#if defined(MBEDTLS_SSL_PROTO_DTLS) - if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM && - ( suite_info->flags & MBEDTLS_CIPHERSUITE_NODTLS ) ) - return( 0 ); -#endif - -#if defined(MBEDTLS_ARC4_C) - if( ssl->conf->arc4_disabled == MBEDTLS_SSL_ARC4_DISABLED && - suite_info->cipher == MBEDTLS_CIPHER_ARC4_128 ) - { - MBEDTLS_SSL_DEBUG_MSG( 3, ( "ciphersuite mismatch: rc4" ) ); - return( 0 ); - } -#endif - -#if defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED) - if( suite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECJPAKE && - ( ssl->handshake->cli_exts & MBEDTLS_TLS_EXT_ECJPAKE_KKPP_OK ) == 0 ) - { - MBEDTLS_SSL_DEBUG_MSG( 3, ( "ciphersuite mismatch: ecjpake " - "not configured or ext missing" ) ); - return( 0 ); - } -#endif - - -#if defined(MBEDTLS_ECDH_C) || defined(MBEDTLS_ECDSA_C) - if( mbedtls_ssl_ciphersuite_uses_ec( suite_info ) && - ( ssl->handshake->curves == NULL || - ssl->handshake->curves[0] == NULL ) ) - { - MBEDTLS_SSL_DEBUG_MSG( 3, ( "ciphersuite mismatch: " - "no common elliptic curve" ) ); - return( 0 ); - } -#endif - -#if defined(MBEDTLS_KEY_EXCHANGE__SOME__PSK_ENABLED) - /* If the ciphersuite requires a pre-shared key and we don't - * have one, skip it now rather than failing later */ - if( mbedtls_ssl_ciphersuite_uses_psk( suite_info ) && - ssl_conf_has_psk_or_cb( ssl->conf ) == 0 ) - { - MBEDTLS_SSL_DEBUG_MSG( 3, ( "ciphersuite mismatch: no pre-shared key" ) ); - return( 0 ); - } -#endif - -#if defined(MBEDTLS_SSL_PROTO_TLS1_2) && \ - defined(MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED) - /* If the ciphersuite requires signing, check whether - * a suitable hash algorithm is present. */ - if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_3 ) - { - sig_type = mbedtls_ssl_get_ciphersuite_sig_alg( suite_info ); - if( sig_type != MBEDTLS_PK_NONE && - mbedtls_ssl_sig_hash_set_find( &ssl->handshake->hash_algs, sig_type ) == MBEDTLS_MD_NONE ) - { - MBEDTLS_SSL_DEBUG_MSG( 3, ( "ciphersuite mismatch: no suitable hash algorithm " - "for signature algorithm %d", sig_type ) ); - return( 0 ); - } - } - -#endif /* MBEDTLS_SSL_PROTO_TLS1_2 && - MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED */ - -#if defined(MBEDTLS_X509_CRT_PARSE_C) - /* - * Final check: if ciphersuite requires us to have a - * certificate/key of a particular type: - * - select the appropriate certificate if we have one, or - * - try the next ciphersuite if we don't - * This must be done last since we modify the key_cert list. - */ - if( ssl_pick_cert( ssl, suite_info ) != 0 ) - { - MBEDTLS_SSL_DEBUG_MSG( 3, ( "ciphersuite mismatch: " - "no suitable certificate" ) ); - return( 0 ); - } -#endif - - *ciphersuite_info = suite_info; - return( 0 ); -} #if defined(MBEDTLS_SSL_SRV_SUPPORT_SSLV2_CLIENT_HELLO) -static int ssl_parse_client_hello_v2( mbedtls_ssl_context *ssl ) -{ - int ret, got_common_suite; - unsigned int i, j; - size_t n; - unsigned int ciph_len, sess_len, chal_len; - unsigned char *buf, *p; - const int *ciphersuites; - const mbedtls_ssl_ciphersuite_t *ciphersuite_info; - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> parse client hello v2" ) ); - -#if defined(MBEDTLS_SSL_RENEGOTIATION) - if( ssl->renego_status != MBEDTLS_SSL_INITIAL_HANDSHAKE ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "client hello v2 illegal for renegotiation" ) ); - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE ); - return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO ); - } -#endif /* MBEDTLS_SSL_RENEGOTIATION */ - - buf = ssl->in_hdr; - - MBEDTLS_SSL_DEBUG_BUF( 4, "record header", buf, 5 ); - - MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello v2, message type: %d", - buf[2] ) ); - MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello v2, message len.: %d", - ( ( buf[0] & 0x7F ) << 8 ) | buf[1] ) ); - MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello v2, max. version: [%d:%d]", - buf[3], buf[4] ) ); - - /* - * SSLv2 Client Hello - * - * Record layer: - * 0 . 1 message length - * - * SSL layer: - * 2 . 2 message type - * 3 . 4 protocol version - */ - if( buf[2] != MBEDTLS_SSL_HS_CLIENT_HELLO || - buf[3] != MBEDTLS_SSL_MAJOR_VERSION_3 ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) ); - return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO ); - } - - n = ( ( buf[0] << 8 ) | buf[1] ) & 0x7FFF; - - if( n < 17 || n > 512 ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) ); - return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO ); - } - - ssl->major_ver = MBEDTLS_SSL_MAJOR_VERSION_3; - ssl->minor_ver = ( buf[4] <= ssl->conf->max_minor_ver ) - ? buf[4] : ssl->conf->max_minor_ver; - - if( ssl->minor_ver < ssl->conf->min_minor_ver ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "client only supports ssl smaller than minimum" - " [%d:%d] < [%d:%d]", - ssl->major_ver, ssl->minor_ver, - ssl->conf->min_major_ver, ssl->conf->min_minor_ver ) ); - - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_PROTOCOL_VERSION ); - return( MBEDTLS_ERR_SSL_BAD_HS_PROTOCOL_VERSION ); - } - - ssl->handshake->max_major_ver = buf[3]; - ssl->handshake->max_minor_ver = buf[4]; - - if( ( ret = mbedtls_ssl_fetch_input( ssl, 2 + n ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_fetch_input", ret ); - return( ret ); - } - - ssl->handshake->update_checksum( ssl, buf + 2, n ); - - buf = ssl->in_msg; - n = ssl->in_left - 5; - - /* - * 0 . 1 ciphersuitelist length - * 2 . 3 session id length - * 4 . 5 challenge length - * 6 . .. ciphersuitelist - * .. . .. session id - * .. . .. challenge - */ - MBEDTLS_SSL_DEBUG_BUF( 4, "record contents", buf, n ); - - ciph_len = ( buf[0] << 8 ) | buf[1]; - sess_len = ( buf[2] << 8 ) | buf[3]; - chal_len = ( buf[4] << 8 ) | buf[5]; - - MBEDTLS_SSL_DEBUG_MSG( 3, ( "ciph_len: %d, sess_len: %d, chal_len: %d", - ciph_len, sess_len, chal_len ) ); - - /* - * Make sure each parameter length is valid - */ - if( ciph_len < 3 || ( ciph_len % 3 ) != 0 ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) ); - return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO ); - } - - if( sess_len > 32 ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) ); - return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO ); - } - - if( chal_len < 8 || chal_len > 32 ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) ); - return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO ); - } - - if( n != 6 + ciph_len + sess_len + chal_len ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) ); - return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO ); - } - - MBEDTLS_SSL_DEBUG_BUF( 3, "client hello, ciphersuitelist", - buf + 6, ciph_len ); - MBEDTLS_SSL_DEBUG_BUF( 3, "client hello, session id", - buf + 6 + ciph_len, sess_len ); - MBEDTLS_SSL_DEBUG_BUF( 3, "client hello, challenge", - buf + 6 + ciph_len + sess_len, chal_len ); - - p = buf + 6 + ciph_len; - ssl->session_negotiate->id_len = sess_len; - memset( ssl->session_negotiate->id, 0, - sizeof( ssl->session_negotiate->id ) ); - memcpy( ssl->session_negotiate->id, p, ssl->session_negotiate->id_len ); - - p += sess_len; - memset( ssl->handshake->randbytes, 0, 64 ); - memcpy( ssl->handshake->randbytes + 32 - chal_len, p, chal_len ); - - /* - * Check for TLS_EMPTY_RENEGOTIATION_INFO_SCSV - */ - for( i = 0, p = buf + 6; i < ciph_len; i += 3, p += 3 ) - { - if( p[0] == 0 && p[1] == 0 && p[2] == MBEDTLS_SSL_EMPTY_RENEGOTIATION_INFO ) - { - MBEDTLS_SSL_DEBUG_MSG( 3, ( "received TLS_EMPTY_RENEGOTIATION_INFO " ) ); -#if defined(MBEDTLS_SSL_RENEGOTIATION) - if( ssl->renego_status == MBEDTLS_SSL_RENEGOTIATION_IN_PROGRESS ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "received RENEGOTIATION SCSV " - "during renegotiation" ) ); - - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE ); - return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO ); - } -#endif /* MBEDTLS_SSL_RENEGOTIATION */ - ssl->secure_renegotiation = MBEDTLS_SSL_SECURE_RENEGOTIATION; - break; - } - } - -#if defined(MBEDTLS_SSL_FALLBACK_SCSV) - for( i = 0, p = buf + 6; i < ciph_len; i += 3, p += 3 ) - { - if( p[0] == 0 && - p[1] == (unsigned char)( ( MBEDTLS_SSL_FALLBACK_SCSV_VALUE >> 8 ) & 0xff ) && - p[2] == (unsigned char)( ( MBEDTLS_SSL_FALLBACK_SCSV_VALUE ) & 0xff ) ) - { - MBEDTLS_SSL_DEBUG_MSG( 3, ( "received FALLBACK_SCSV" ) ); - - if( ssl->minor_ver < ssl->conf->max_minor_ver ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "inapropriate fallback" ) ); - - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_INAPROPRIATE_FALLBACK ); - - return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO ); - } - - break; - } - } -#endif /* MBEDTLS_SSL_FALLBACK_SCSV */ - - got_common_suite = 0; - ciphersuites = ssl->conf->ciphersuite_list[ssl->minor_ver]; - ciphersuite_info = NULL; -#if defined(MBEDTLS_SSL_SRV_RESPECT_CLIENT_PREFERENCE) - for( j = 0, p = buf + 6; j < ciph_len; j += 3, p += 3 ) - for( i = 0; ciphersuites[i] != 0; i++ ) -#else - for( i = 0; ciphersuites[i] != 0; i++ ) - for( j = 0, p = buf + 6; j < ciph_len; j += 3, p += 3 ) -#endif - { - if( p[0] != 0 || - p[1] != ( ( ciphersuites[i] >> 8 ) & 0xFF ) || - p[2] != ( ( ciphersuites[i] ) & 0xFF ) ) - continue; - - got_common_suite = 1; - - if( ( ret = ssl_ciphersuite_match( ssl, ciphersuites[i], - &ciphersuite_info ) ) != 0 ) - return( ret ); - - if( ciphersuite_info != NULL ) - goto have_ciphersuite_v2; - } - - if( got_common_suite ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "got ciphersuites in common, " - "but none of them usable" ) ); - return( MBEDTLS_ERR_SSL_NO_USABLE_CIPHERSUITE ); - } - else - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "got no ciphersuites in common" ) ); - return( MBEDTLS_ERR_SSL_NO_CIPHER_CHOSEN ); - } - -have_ciphersuite_v2: - MBEDTLS_SSL_DEBUG_MSG( 2, ( "selected ciphersuite: %s", ciphersuite_info->name ) ); - - ssl->session_negotiate->ciphersuite = ciphersuites[i]; - ssl->handshake->ciphersuite_info = ciphersuite_info; - - /* - * SSLv2 Client Hello relevant renegotiation security checks - */ - if( ssl->secure_renegotiation == MBEDTLS_SSL_LEGACY_RENEGOTIATION && - ssl->conf->allow_legacy_renegotiation == MBEDTLS_SSL_LEGACY_BREAK_HANDSHAKE ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "legacy renegotiation, breaking off handshake" ) ); - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE ); - return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO ); - } - - ssl->in_left = 0; - ssl->state++; - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= parse client hello v2" ) ); - - return( 0 ); -} +static int ssl_parse_client_hello_v2( mbedtls_ssl_context *ssl ); #endif /* MBEDTLS_SSL_SRV_SUPPORT_SSLV2_CLIENT_HELLO */ +static int ssl_ciphersuite_match( mbedtls_ssl_context *ssl, int suite_id, + const mbedtls_ssl_ciphersuite_t **ciphersuite_info ); + /* This function doesn't alert on errors that happen early during ClientHello parsing because they might indicate that the client is not talking SSL/TLS at all and would not understand our alert. */ @@ -2158,351 +2257,389 @@ have_ciphersuite: return( 0 ); } -#if defined(MBEDTLS_SSL_TRUNCATED_HMAC) -static void ssl_write_truncated_hmac_ext( mbedtls_ssl_context *ssl, - unsigned char *buf, - size_t *olen ) +/* + * Check if a given ciphersuite is suitable for use with our config/keys/etc + * Sets ciphersuite_info only if the suite matches. + */ +static int ssl_ciphersuite_match( mbedtls_ssl_context *ssl, int suite_id, + const mbedtls_ssl_ciphersuite_t **ciphersuite_info ) { - unsigned char *p = buf; + const mbedtls_ssl_ciphersuite_t *suite_info; - if( ssl->session_negotiate->trunc_hmac == MBEDTLS_SSL_TRUNC_HMAC_DISABLED ) +#if defined(MBEDTLS_SSL_PROTO_TLS1_2) && \ + defined(MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED) + mbedtls_pk_type_t sig_type; +#endif + + suite_info = mbedtls_ssl_ciphersuite_from_id( suite_id ); + if( suite_info == NULL ) { - *olen = 0; - return; + MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) ); + return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); } - MBEDTLS_SSL_DEBUG_MSG( 3, ( "server hello, adding truncated hmac extension" ) ); + MBEDTLS_SSL_DEBUG_MSG( 3, ( "trying ciphersuite: %s", suite_info->name ) ); - *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_TRUNCATED_HMAC >> 8 ) & 0xFF ); - *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_TRUNCATED_HMAC ) & 0xFF ); - - *p++ = 0x00; - *p++ = 0x00; - - *olen = 4; -} -#endif /* MBEDTLS_SSL_TRUNCATED_HMAC */ - -#if defined(MBEDTLS_SSL_DTLS_CONNECTION_ID) -static void ssl_write_cid_ext( mbedtls_ssl_context *ssl, - unsigned char *buf, - size_t *olen ) -{ - unsigned char *p = buf; - size_t ext_len; - const unsigned char *end = ssl->out_msg + MBEDTLS_SSL_OUT_CONTENT_LEN; - - *olen = 0; - - /* Skip writing the extension if we don't want to use it or if - * the client hasn't offered it. */ - if( ssl->handshake->cid_in_use == MBEDTLS_SSL_CID_DISABLED ) - return; - - /* ssl->own_cid_len is at most MBEDTLS_SSL_CID_IN_LEN_MAX - * which is at most 255, so the increment cannot overflow. */ - if( end < p || (size_t)( end - p ) < (unsigned)( ssl->own_cid_len + 5 ) ) + if( suite_info->min_minor_ver > ssl->minor_ver || + suite_info->max_minor_ver < ssl->minor_ver ) { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "buffer too small" ) ); - return; + MBEDTLS_SSL_DEBUG_MSG( 3, ( "ciphersuite mismatch: version" ) ); + return( 0 ); } - MBEDTLS_SSL_DEBUG_MSG( 3, ( "server hello, adding CID extension" ) ); +#if defined(MBEDTLS_SSL_PROTO_DTLS) + if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM && + ( suite_info->flags & MBEDTLS_CIPHERSUITE_NODTLS ) ) + return( 0 ); +#endif +#if defined(MBEDTLS_ARC4_C) + if( ssl->conf->arc4_disabled == MBEDTLS_SSL_ARC4_DISABLED && + suite_info->cipher == MBEDTLS_CIPHER_ARC4_128 ) + { + MBEDTLS_SSL_DEBUG_MSG( 3, ( "ciphersuite mismatch: rc4" ) ); + return( 0 ); + } +#endif + +#if defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED) + if( suite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECJPAKE && + ( ssl->handshake->cli_exts & MBEDTLS_TLS_EXT_ECJPAKE_KKPP_OK ) == 0 ) + { + MBEDTLS_SSL_DEBUG_MSG( 3, ( "ciphersuite mismatch: ecjpake " + "not configured or ext missing" ) ); + return( 0 ); + } +#endif + + +#if defined(MBEDTLS_ECDH_C) || defined(MBEDTLS_ECDSA_C) + if( mbedtls_ssl_ciphersuite_uses_ec( suite_info ) && + ( ssl->handshake->curves == NULL || + ssl->handshake->curves[0] == NULL ) ) + { + MBEDTLS_SSL_DEBUG_MSG( 3, ( "ciphersuite mismatch: " + "no common elliptic curve" ) ); + return( 0 ); + } +#endif + +#if defined(MBEDTLS_KEY_EXCHANGE__SOME__PSK_ENABLED) + /* If the ciphersuite requires a pre-shared key and we don't + * have one, skip it now rather than failing later */ + if( mbedtls_ssl_ciphersuite_uses_psk( suite_info ) && + ssl_conf_has_psk_or_cb( ssl->conf ) == 0 ) + { + MBEDTLS_SSL_DEBUG_MSG( 3, ( "ciphersuite mismatch: no pre-shared key" ) ); + return( 0 ); + } +#endif + +#if defined(MBEDTLS_SSL_PROTO_TLS1_2) && \ + defined(MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED) + /* If the ciphersuite requires signing, check whether + * a suitable hash algorithm is present. */ + if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_3 ) + { + sig_type = mbedtls_ssl_get_ciphersuite_sig_alg( suite_info ); + if( sig_type != MBEDTLS_PK_NONE && + mbedtls_ssl_sig_hash_set_find( &ssl->handshake->hash_algs, sig_type ) == MBEDTLS_MD_NONE ) + { + MBEDTLS_SSL_DEBUG_MSG( 3, ( "ciphersuite mismatch: no suitable hash algorithm " + "for signature algorithm %d", sig_type ) ); + return( 0 ); + } + } + +#endif /* MBEDTLS_SSL_PROTO_TLS1_2 && + MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED */ + +#if defined(MBEDTLS_X509_CRT_PARSE_C) /* - * Quoting draft-ietf-tls-dtls-connection-id-05 - * https://tools.ietf.org/html/draft-ietf-tls-dtls-connection-id-05 - * - * struct { - * opaque cid<0..2^8-1>; - * } ConnectionId; - */ - - *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_CID >> 8 ) & 0xFF ); - *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_CID ) & 0xFF ); - ext_len = (size_t) ssl->own_cid_len + 1; - *p++ = (unsigned char)( ( ext_len >> 8 ) & 0xFF ); - *p++ = (unsigned char)( ( ext_len ) & 0xFF ); - - *p++ = (uint8_t) ssl->own_cid_len; - memcpy( p, ssl->own_cid, ssl->own_cid_len ); - - *olen = ssl->own_cid_len + 5; -} -#endif /* MBEDTLS_SSL_DTLS_CONNECTION_ID */ - -#if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC) -static void ssl_write_encrypt_then_mac_ext( mbedtls_ssl_context *ssl, - unsigned char *buf, - size_t *olen ) -{ - unsigned char *p = buf; - const mbedtls_ssl_ciphersuite_t *suite = NULL; - const mbedtls_cipher_info_t *cipher = NULL; - - if( ssl->session_negotiate->encrypt_then_mac == MBEDTLS_SSL_ETM_DISABLED || - ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 ) - { - *olen = 0; - return; - } - - /* - * RFC 7366: "If a server receives an encrypt-then-MAC request extension - * from a client and then selects a stream or Authenticated Encryption - * with Associated Data (AEAD) ciphersuite, it MUST NOT send an - * encrypt-then-MAC response extension back to the client." + * Final check: if ciphersuite requires us to have a + * certificate/key of a particular type: + * - select the appropriate certificate if we have one, or + * - try the next ciphersuite if we don't + * This must be done last since we modify the key_cert list. */ - if( ( suite = mbedtls_ssl_ciphersuite_from_id( - ssl->session_negotiate->ciphersuite ) ) == NULL || - ( cipher = mbedtls_cipher_info_from_type( suite->cipher ) ) == NULL || - cipher->mode != MBEDTLS_MODE_CBC ) + if( ssl_pick_cert( ssl, suite_info ) != 0 ) { - *olen = 0; - return; + MBEDTLS_SSL_DEBUG_MSG( 3, ( "ciphersuite mismatch: " + "no suitable certificate" ) ); + return( 0 ); } +#endif - MBEDTLS_SSL_DEBUG_MSG( 3, ( "server hello, adding encrypt then mac extension" ) ); - - *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_ENCRYPT_THEN_MAC >> 8 ) & 0xFF ); - *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_ENCRYPT_THEN_MAC ) & 0xFF ); - - *p++ = 0x00; - *p++ = 0x00; - - *olen = 4; + *ciphersuite_info = suite_info; + return( 0 ); } -#endif /* MBEDTLS_SSL_ENCRYPT_THEN_MAC */ -#if defined(MBEDTLS_SSL_EXTENDED_MASTER_SECRET) -static void ssl_write_extended_ms_ext( mbedtls_ssl_context *ssl, - unsigned char *buf, - size_t *olen ) +#if defined(MBEDTLS_SSL_SRV_SUPPORT_SSLV2_CLIENT_HELLO) +static int ssl_parse_client_hello_v2( mbedtls_ssl_context *ssl ) { - unsigned char *p = buf; + int ret, got_common_suite; + unsigned int i, j; + size_t n; + unsigned int ciph_len, sess_len, chal_len; + unsigned char *buf, *p; + const int *ciphersuites; + const mbedtls_ssl_ciphersuite_t *ciphersuite_info; - if( ssl->handshake->extended_ms == MBEDTLS_SSL_EXTENDED_MS_DISABLED || - ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 ) - { - *olen = 0; - return; - } - - MBEDTLS_SSL_DEBUG_MSG( 3, ( "server hello, adding extended master secret " - "extension" ) ); - - *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_EXTENDED_MASTER_SECRET >> 8 ) & 0xFF ); - *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_EXTENDED_MASTER_SECRET ) & 0xFF ); - - *p++ = 0x00; - *p++ = 0x00; - - *olen = 4; -} -#endif /* MBEDTLS_SSL_EXTENDED_MASTER_SECRET */ - -#if defined(MBEDTLS_SSL_SESSION_TICKETS) -static void ssl_write_session_ticket_ext( mbedtls_ssl_context *ssl, - unsigned char *buf, - size_t *olen ) -{ - unsigned char *p = buf; - - if( ssl->handshake->new_session_ticket == 0 ) - { - *olen = 0; - return; - } - - MBEDTLS_SSL_DEBUG_MSG( 3, ( "server hello, adding session ticket extension" ) ); - - *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_SESSION_TICKET >> 8 ) & 0xFF ); - *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_SESSION_TICKET ) & 0xFF ); - - *p++ = 0x00; - *p++ = 0x00; - - *olen = 4; -} -#endif /* MBEDTLS_SSL_SESSION_TICKETS */ - -static void ssl_write_renegotiation_ext( mbedtls_ssl_context *ssl, - unsigned char *buf, - size_t *olen ) -{ - unsigned char *p = buf; - - if( ssl->secure_renegotiation != MBEDTLS_SSL_SECURE_RENEGOTIATION ) - { - *olen = 0; - return; - } - - MBEDTLS_SSL_DEBUG_MSG( 3, ( "server hello, secure renegotiation extension" ) ); - - *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_RENEGOTIATION_INFO >> 8 ) & 0xFF ); - *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_RENEGOTIATION_INFO ) & 0xFF ); + MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> parse client hello v2" ) ); #if defined(MBEDTLS_SSL_RENEGOTIATION) if( ssl->renego_status != MBEDTLS_SSL_INITIAL_HANDSHAKE ) { - *p++ = 0x00; - *p++ = ( ssl->verify_data_len * 2 + 1 ) & 0xFF; - *p++ = ssl->verify_data_len * 2 & 0xFF; - - memcpy( p, ssl->peer_verify_data, ssl->verify_data_len ); - p += ssl->verify_data_len; - memcpy( p, ssl->own_verify_data, ssl->verify_data_len ); - p += ssl->verify_data_len; + MBEDTLS_SSL_DEBUG_MSG( 1, ( "client hello v2 illegal for renegotiation" ) ); + mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, + MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE ); + return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO ); } - else #endif /* MBEDTLS_SSL_RENEGOTIATION */ - { - *p++ = 0x00; - *p++ = 0x01; - *p++ = 0x00; - } - *olen = p - buf; -} + buf = ssl->in_hdr; -#if defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH) -static void ssl_write_max_fragment_length_ext( mbedtls_ssl_context *ssl, - unsigned char *buf, - size_t *olen ) -{ - unsigned char *p = buf; + MBEDTLS_SSL_DEBUG_BUF( 4, "record header", buf, 5 ); - if( ssl->session_negotiate->mfl_code == MBEDTLS_SSL_MAX_FRAG_LEN_NONE ) - { - *olen = 0; - return; - } - - MBEDTLS_SSL_DEBUG_MSG( 3, ( "server hello, max_fragment_length extension" ) ); - - *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_MAX_FRAGMENT_LENGTH >> 8 ) & 0xFF ); - *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_MAX_FRAGMENT_LENGTH ) & 0xFF ); - - *p++ = 0x00; - *p++ = 1; - - *p++ = ssl->session_negotiate->mfl_code; - - *olen = 5; -} -#endif /* MBEDTLS_SSL_MAX_FRAGMENT_LENGTH */ - -#if defined(MBEDTLS_ECDH_C) || defined(MBEDTLS_ECDSA_C) || \ - defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED) -static void ssl_write_supported_point_formats_ext( mbedtls_ssl_context *ssl, - unsigned char *buf, - size_t *olen ) -{ - unsigned char *p = buf; - ((void) ssl); - - if( ( ssl->handshake->cli_exts & - MBEDTLS_TLS_EXT_SUPPORTED_POINT_FORMATS_PRESENT ) == 0 ) - { - *olen = 0; - return; - } - - MBEDTLS_SSL_DEBUG_MSG( 3, ( "server hello, supported_point_formats extension" ) ); - - *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_SUPPORTED_POINT_FORMATS >> 8 ) & 0xFF ); - *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_SUPPORTED_POINT_FORMATS ) & 0xFF ); - - *p++ = 0x00; - *p++ = 2; - - *p++ = 1; - *p++ = MBEDTLS_ECP_PF_UNCOMPRESSED; - - *olen = 6; -} -#endif /* MBEDTLS_ECDH_C || MBEDTLS_ECDSA_C || MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED */ - -#if defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED) -static void ssl_write_ecjpake_kkpp_ext( mbedtls_ssl_context *ssl, - unsigned char *buf, - size_t *olen ) -{ - int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; - unsigned char *p = buf; - const unsigned char *end = ssl->out_msg + MBEDTLS_SSL_OUT_CONTENT_LEN; - size_t kkpp_len; - - *olen = 0; - - /* Skip costly computation if not needed */ - if( ssl->handshake->ciphersuite_info->key_exchange != - MBEDTLS_KEY_EXCHANGE_ECJPAKE ) - return; - - MBEDTLS_SSL_DEBUG_MSG( 3, ( "server hello, ecjpake kkpp extension" ) ); - - if( end - p < 4 ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "buffer too small" ) ); - return; - } - - *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_ECJPAKE_KKPP >> 8 ) & 0xFF ); - *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_ECJPAKE_KKPP ) & 0xFF ); - - ret = mbedtls_ecjpake_write_round_one( &ssl->handshake->ecjpake_ctx, - p + 2, end - p - 2, &kkpp_len, - ssl->conf->f_rng, ssl->conf->p_rng ); - if( ret != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1 , "mbedtls_ecjpake_write_round_one", ret ); - return; - } - - *p++ = (unsigned char)( ( kkpp_len >> 8 ) & 0xFF ); - *p++ = (unsigned char)( ( kkpp_len ) & 0xFF ); - - *olen = kkpp_len + 4; -} -#endif /* MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED */ - -#if defined(MBEDTLS_SSL_ALPN ) -static void ssl_write_alpn_ext( mbedtls_ssl_context *ssl, - unsigned char *buf, size_t *olen ) -{ - if( ssl->alpn_chosen == NULL ) - { - *olen = 0; - return; - } - - MBEDTLS_SSL_DEBUG_MSG( 3, ( "server hello, adding alpn extension" ) ); + MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello v2, message type: %d", + buf[2] ) ); + MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello v2, message len.: %d", + ( ( buf[0] & 0x7F ) << 8 ) | buf[1] ) ); + MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello v2, max. version: [%d:%d]", + buf[3], buf[4] ) ); /* - * 0 . 1 ext identifier - * 2 . 3 ext length - * 4 . 5 protocol list length - * 6 . 6 protocol name length - * 7 . 7+n protocol name + * SSLv2 Client Hello + * + * Record layer: + * 0 . 1 message length + * + * SSL layer: + * 2 . 2 message type + * 3 . 4 protocol version */ - buf[0] = (unsigned char)( ( MBEDTLS_TLS_EXT_ALPN >> 8 ) & 0xFF ); - buf[1] = (unsigned char)( ( MBEDTLS_TLS_EXT_ALPN ) & 0xFF ); + if( buf[2] != MBEDTLS_SSL_HS_CLIENT_HELLO || + buf[3] != MBEDTLS_SSL_MAJOR_VERSION_3 ) + { + MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) ); + return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO ); + } - *olen = 7 + strlen( ssl->alpn_chosen ); + n = ( ( buf[0] << 8 ) | buf[1] ) & 0x7FFF; - buf[2] = (unsigned char)( ( ( *olen - 4 ) >> 8 ) & 0xFF ); - buf[3] = (unsigned char)( ( ( *olen - 4 ) ) & 0xFF ); + if( n < 17 || n > 512 ) + { + MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) ); + return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO ); + } - buf[4] = (unsigned char)( ( ( *olen - 6 ) >> 8 ) & 0xFF ); - buf[5] = (unsigned char)( ( ( *olen - 6 ) ) & 0xFF ); + ssl->major_ver = MBEDTLS_SSL_MAJOR_VERSION_3; + ssl->minor_ver = ( buf[4] <= ssl->conf->max_minor_ver ) + ? buf[4] : ssl->conf->max_minor_ver; - buf[6] = (unsigned char)( ( ( *olen - 7 ) ) & 0xFF ); + if( ssl->minor_ver < ssl->conf->min_minor_ver ) + { + MBEDTLS_SSL_DEBUG_MSG( 1, ( "client only supports ssl smaller than minimum" + " [%d:%d] < [%d:%d]", + ssl->major_ver, ssl->minor_ver, + ssl->conf->min_major_ver, ssl->conf->min_minor_ver ) ); - memcpy( buf + 7, ssl->alpn_chosen, *olen - 7 ); + mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, + MBEDTLS_SSL_ALERT_MSG_PROTOCOL_VERSION ); + return( MBEDTLS_ERR_SSL_BAD_HS_PROTOCOL_VERSION ); + } + + ssl->handshake->max_major_ver = buf[3]; + ssl->handshake->max_minor_ver = buf[4]; + + if( ( ret = mbedtls_ssl_fetch_input( ssl, 2 + n ) ) != 0 ) + { + MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_fetch_input", ret ); + return( ret ); + } + + ssl->handshake->update_checksum( ssl, buf + 2, n ); + + buf = ssl->in_msg; + n = ssl->in_left - 5; + + /* + * 0 . 1 ciphersuitelist length + * 2 . 3 session id length + * 4 . 5 challenge length + * 6 . .. ciphersuitelist + * .. . .. session id + * .. . .. challenge + */ + MBEDTLS_SSL_DEBUG_BUF( 4, "record contents", buf, n ); + + ciph_len = ( buf[0] << 8 ) | buf[1]; + sess_len = ( buf[2] << 8 ) | buf[3]; + chal_len = ( buf[4] << 8 ) | buf[5]; + + MBEDTLS_SSL_DEBUG_MSG( 3, ( "ciph_len: %d, sess_len: %d, chal_len: %d", + ciph_len, sess_len, chal_len ) ); + + /* + * Make sure each parameter length is valid + */ + if( ciph_len < 3 || ( ciph_len % 3 ) != 0 ) + { + MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) ); + return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO ); + } + + if( sess_len > 32 ) + { + MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) ); + return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO ); + } + + if( chal_len < 8 || chal_len > 32 ) + { + MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) ); + return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO ); + } + + if( n != 6 + ciph_len + sess_len + chal_len ) + { + MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) ); + return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO ); + } + + MBEDTLS_SSL_DEBUG_BUF( 3, "client hello, ciphersuitelist", + buf + 6, ciph_len ); + MBEDTLS_SSL_DEBUG_BUF( 3, "client hello, session id", + buf + 6 + ciph_len, sess_len ); + MBEDTLS_SSL_DEBUG_BUF( 3, "client hello, challenge", + buf + 6 + ciph_len + sess_len, chal_len ); + + p = buf + 6 + ciph_len; + ssl->session_negotiate->id_len = sess_len; + memset( ssl->session_negotiate->id, 0, + sizeof( ssl->session_negotiate->id ) ); + memcpy( ssl->session_negotiate->id, p, ssl->session_negotiate->id_len ); + + p += sess_len; + memset( ssl->handshake->randbytes, 0, 64 ); + memcpy( ssl->handshake->randbytes + 32 - chal_len, p, chal_len ); + + /* + * Check for TLS_EMPTY_RENEGOTIATION_INFO_SCSV + */ + for( i = 0, p = buf + 6; i < ciph_len; i += 3, p += 3 ) + { + if( p[0] == 0 && p[1] == 0 && p[2] == MBEDTLS_SSL_EMPTY_RENEGOTIATION_INFO ) + { + MBEDTLS_SSL_DEBUG_MSG( 3, ( "received TLS_EMPTY_RENEGOTIATION_INFO " ) ); +#if defined(MBEDTLS_SSL_RENEGOTIATION) + if( ssl->renego_status == MBEDTLS_SSL_RENEGOTIATION_IN_PROGRESS ) + { + MBEDTLS_SSL_DEBUG_MSG( 1, ( "received RENEGOTIATION SCSV " + "during renegotiation" ) ); + + mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, + MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE ); + return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO ); + } +#endif /* MBEDTLS_SSL_RENEGOTIATION */ + ssl->secure_renegotiation = MBEDTLS_SSL_SECURE_RENEGOTIATION; + break; + } + } + +#if defined(MBEDTLS_SSL_FALLBACK_SCSV) + for( i = 0, p = buf + 6; i < ciph_len; i += 3, p += 3 ) + { + if( p[0] == 0 && + p[1] == (unsigned char)( ( MBEDTLS_SSL_FALLBACK_SCSV_VALUE >> 8 ) & 0xff ) && + p[2] == (unsigned char)( ( MBEDTLS_SSL_FALLBACK_SCSV_VALUE ) & 0xff ) ) + { + MBEDTLS_SSL_DEBUG_MSG( 3, ( "received FALLBACK_SCSV" ) ); + + if( ssl->minor_ver < ssl->conf->max_minor_ver ) + { + MBEDTLS_SSL_DEBUG_MSG( 1, ( "inapropriate fallback" ) ); + + mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, + MBEDTLS_SSL_ALERT_MSG_INAPROPRIATE_FALLBACK ); + + return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO ); + } + + break; + } + } +#endif /* MBEDTLS_SSL_FALLBACK_SCSV */ + + got_common_suite = 0; + ciphersuites = ssl->conf->ciphersuite_list[ssl->minor_ver]; + ciphersuite_info = NULL; +#if defined(MBEDTLS_SSL_SRV_RESPECT_CLIENT_PREFERENCE) + for( j = 0, p = buf + 6; j < ciph_len; j += 3, p += 3 ) + for( i = 0; ciphersuites[i] != 0; i++ ) +#else + for( i = 0; ciphersuites[i] != 0; i++ ) + for( j = 0, p = buf + 6; j < ciph_len; j += 3, p += 3 ) +#endif + { + if( p[0] != 0 || + p[1] != ( ( ciphersuites[i] >> 8 ) & 0xFF ) || + p[2] != ( ( ciphersuites[i] ) & 0xFF ) ) + continue; + + got_common_suite = 1; + + if( ( ret = ssl_ciphersuite_match( ssl, ciphersuites[i], + &ciphersuite_info ) ) != 0 ) + return( ret ); + + if( ciphersuite_info != NULL ) + goto have_ciphersuite_v2; + } + + if( got_common_suite ) + { + MBEDTLS_SSL_DEBUG_MSG( 1, ( "got ciphersuites in common, " + "but none of them usable" ) ); + return( MBEDTLS_ERR_SSL_NO_USABLE_CIPHERSUITE ); + } + else + { + MBEDTLS_SSL_DEBUG_MSG( 1, ( "got no ciphersuites in common" ) ); + return( MBEDTLS_ERR_SSL_NO_CIPHER_CHOSEN ); + } + +have_ciphersuite_v2: + MBEDTLS_SSL_DEBUG_MSG( 2, ( "selected ciphersuite: %s", ciphersuite_info->name ) ); + + ssl->session_negotiate->ciphersuite = ciphersuites[i]; + ssl->handshake->ciphersuite_info = ciphersuite_info; + + /* + * SSLv2 Client Hello relevant renegotiation security checks + */ + if( ssl->secure_renegotiation == MBEDTLS_SSL_LEGACY_RENEGOTIATION && + ssl->conf->allow_legacy_renegotiation == MBEDTLS_SSL_LEGACY_BREAK_HANDSHAKE ) + { + MBEDTLS_SSL_DEBUG_MSG( 1, ( "legacy renegotiation, breaking off handshake" ) ); + mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, + MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE ); + return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO ); + } + + ssl->in_left = 0; + ssl->state++; + + MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= parse client hello v2" ) ); + + return( 0 ); } -#endif /* MBEDTLS_ECDH_C || MBEDTLS_ECDSA_C */ +#endif /* MBEDTLS_SSL_SRV_SUPPORT_SSLV2_CLIENT_HELLO */ + +/* + * SERVER HANDSHAKE STATE: Outgoing `HelloVerifyRequest` + */ #if defined(MBEDTLS_SSL_DTLS_HELLO_VERIFY) static int ssl_write_hello_verify_request( mbedtls_ssl_context *ssl ) @@ -2576,6 +2713,10 @@ static int ssl_write_hello_verify_request( mbedtls_ssl_context *ssl ) } #endif /* MBEDTLS_SSL_DTLS_HELLO_VERIFY */ +/* + * SERVER HANDSHAKE STATE: Outgoing `ServerHello` + */ + static int ssl_write_server_hello( mbedtls_ssl_context *ssl ) { #if defined(MBEDTLS_HAVE_TIME) @@ -2816,218 +2957,133 @@ static int ssl_write_server_hello( mbedtls_ssl_context *ssl ) return( ret ); } -#if !defined(MBEDTLS_KEY_EXCHANGE__CERT_REQ_ALLOWED__ENABLED) -static int ssl_write_certificate_request( mbedtls_ssl_context *ssl ) -{ - const mbedtls_ssl_ciphersuite_t *ciphersuite_info = - ssl->handshake->ciphersuite_info; +/* + * SERVER HANDSHAKE STATE: Outgoing `Certificate` + * + * This is shared with the client-side and implemented in ssl_12_gen.c. + */ - MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> write certificate request" ) ); +/* + * SERVER HANDSHAKE STATE: Outgoing `ServerKeyExchange` + */ - if( !mbedtls_ssl_ciphersuite_cert_req_allowed( ciphersuite_info ) ) - { - MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= skip write certificate request" ) ); - ssl->state++; - return( 0 ); - } +static int ssl_prepare_server_key_exchange( mbedtls_ssl_context *ssl, + size_t *signature_len ); - MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) ); - return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); -} -#else /* !MBEDTLS_KEY_EXCHANGE__CERT_REQ_ALLOWED__ENABLED */ -static int ssl_write_certificate_request( mbedtls_ssl_context *ssl ) -{ - int ret = MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE; - const mbedtls_ssl_ciphersuite_t *ciphersuite_info = - ssl->handshake->ciphersuite_info; - size_t dn_size, total_dn_size; /* excluding length bytes */ - size_t ct_len, sa_len; /* including length bytes */ - unsigned char *buf, *p; - const unsigned char * const end = ssl->out_msg + MBEDTLS_SSL_OUT_CONTENT_LEN; - const mbedtls_x509_crt *crt; - int authmode; - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> write certificate request" ) ); - - ssl->state++; - -#if defined(MBEDTLS_SSL_SERVER_NAME_INDICATION) - if( ssl->handshake->sni_authmode != MBEDTLS_SSL_VERIFY_UNSET ) - authmode = ssl->handshake->sni_authmode; - else -#endif - authmode = ssl->conf->authmode; - - if( !mbedtls_ssl_ciphersuite_cert_req_allowed( ciphersuite_info ) || - authmode == MBEDTLS_SSL_VERIFY_NONE ) - { - MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= skip write certificate request" ) ); - return( 0 ); - } - - /* - * 0 . 0 handshake type - * 1 . 3 handshake length - * 4 . 4 cert type count - * 5 .. m-1 cert types - * m .. m+1 sig alg length (TLS 1.2 only) - * m+1 .. n-1 SignatureAndHashAlgorithms (TLS 1.2 only) - * n .. n+1 length of all DNs - * n+2 .. n+3 length of DN 1 - * n+4 .. ... Distinguished Name #1 - * ... .. ... length of DN 2, etc. - */ - buf = ssl->out_msg; - p = buf + 4; - - /* - * Supported certificate types - * - * ClientCertificateType certificate_types<1..2^8-1>; - * enum { (255) } ClientCertificateType; - */ - ct_len = 0; - -#if defined(MBEDTLS_RSA_C) - p[1 + ct_len++] = MBEDTLS_SSL_CERT_TYPE_RSA_SIGN; -#endif -#if defined(MBEDTLS_ECDSA_C) - p[1 + ct_len++] = MBEDTLS_SSL_CERT_TYPE_ECDSA_SIGN; -#endif - - p[0] = (unsigned char) ct_len++; - p += ct_len; - - sa_len = 0; -#if defined(MBEDTLS_SSL_PROTO_TLS1_2) - /* - * Add signature_algorithms for verify (TLS 1.2) - * - * SignatureAndHashAlgorithm supported_signature_algorithms<2..2^16-2>; - * - * struct { - * HashAlgorithm hash; - * SignatureAlgorithm signature; - * } SignatureAndHashAlgorithm; - * - * enum { (255) } HashAlgorithm; - * enum { (255) } SignatureAlgorithm; - */ - if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_3 ) - { - const int *cur; - - /* - * Supported signature algorithms - */ - for( cur = ssl->conf->sig_hashes; *cur != MBEDTLS_MD_NONE; cur++ ) - { - unsigned char hash = mbedtls_ssl_hash_from_md_alg( *cur ); - - if( MBEDTLS_SSL_HASH_NONE == hash || mbedtls_ssl_set_calc_verify_md( ssl, hash ) ) - continue; - -#if defined(MBEDTLS_RSA_C) - p[2 + sa_len++] = hash; - p[2 + sa_len++] = MBEDTLS_SSL_SIG_RSA; -#endif -#if defined(MBEDTLS_ECDSA_C) - p[2 + sa_len++] = hash; - p[2 + sa_len++] = MBEDTLS_SSL_SIG_ECDSA; -#endif - } - - p[0] = (unsigned char)( sa_len >> 8 ); - p[1] = (unsigned char)( sa_len ); - sa_len += 2; - p += sa_len; - } -#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */ - - /* - * DistinguishedName certificate_authorities<0..2^16-1>; - * opaque DistinguishedName<1..2^16-1>; - */ - p += 2; - - total_dn_size = 0; - - if( ssl->conf->cert_req_ca_list == MBEDTLS_SSL_CERT_REQ_CA_LIST_ENABLED ) - { - /* NOTE: If trusted certificates are provisioned - * via a CA callback (configured through - * `mbedtls_ssl_conf_ca_cb()`, then the - * CertificateRequest is currently left empty. */ - -#if defined(MBEDTLS_SSL_SERVER_NAME_INDICATION) - if( ssl->handshake->sni_ca_chain != NULL ) - crt = ssl->handshake->sni_ca_chain; - else -#endif - crt = ssl->conf->ca_chain; - - while( crt != NULL && crt->version != 0 ) - { - dn_size = crt->subject_raw.len; - - if( end < p || - (size_t)( end - p ) < dn_size || - (size_t)( end - p ) < 2 + dn_size ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "skipping CAs: buffer too short" ) ); - break; - } - - *p++ = (unsigned char)( dn_size >> 8 ); - *p++ = (unsigned char)( dn_size ); - memcpy( p, crt->subject_raw.p, dn_size ); - p += dn_size; - - MBEDTLS_SSL_DEBUG_BUF( 3, "requested DN", p - dn_size, dn_size ); - - total_dn_size += 2 + dn_size; - crt = crt->next; - } - } - - ssl->out_msglen = p - buf; - ssl->out_msgtype = MBEDTLS_SSL_MSG_HANDSHAKE; - ssl->out_msg[0] = MBEDTLS_SSL_HS_CERTIFICATE_REQUEST; - ssl->out_msg[4 + ct_len + sa_len] = (unsigned char)( total_dn_size >> 8 ); - ssl->out_msg[5 + ct_len + sa_len] = (unsigned char)( total_dn_size ); - - ret = mbedtls_ssl_write_handshake_msg( ssl ); - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= write certificate request" ) ); - - return( ret ); -} -#endif /* MBEDTLS_KEY_EXCHANGE__CERT_REQ_ALLOWED__ENABLED */ +#if defined(MBEDTLS_KEY_EXCHANGE__WITH_SERVER_SIGNATURE__ENABLED) && \ + defined(MBEDTLS_SSL_ASYNC_PRIVATE) +static int ssl_resume_server_key_exchange( mbedtls_ssl_context *ssl, + size_t *signature_len ); +#endif /* defined(MBEDTLS_KEY_EXCHANGE__WITH_SERVER_SIGNATURE__ENABLED) && + defined(MBEDTLS_SSL_ASYNC_PRIVATE) */ #if defined(MBEDTLS_KEY_EXCHANGE_ECDH_RSA_ENABLED) || \ defined(MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA_ENABLED) -static int ssl_get_ecdh_params_from_cert( mbedtls_ssl_context *ssl ) +static int ssl_get_ecdh_params_from_cert( mbedtls_ssl_context *ssl ); +#endif /* MBEDTLS_KEY_EXCHANGE_ECDH_RSA_ENABLED) || + MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA_ENABLED */ + + +/* Prepare the ServerKeyExchange message and send it. For ciphersuites + * that do not include a ServerKeyExchange message, do nothing. Either + * way, if successful, move on to the next step in the SSL state + * machine. */ +static int ssl_write_server_key_exchange( mbedtls_ssl_context *ssl ) { int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; + size_t signature_len = 0; +#if defined(MBEDTLS_KEY_EXCHANGE__SOME_NON_PFS__ENABLED) + const mbedtls_ssl_ciphersuite_t *ciphersuite_info = + ssl->handshake->ciphersuite_info; +#endif /* MBEDTLS_KEY_EXCHANGE__SOME_NON_PFS__ENABLED */ - if( ! mbedtls_pk_can_do( mbedtls_ssl_own_key( ssl ), MBEDTLS_PK_ECKEY ) ) + MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> write server key exchange" ) ); + +#if defined(MBEDTLS_KEY_EXCHANGE__SOME_NON_PFS__ENABLED) + /* Extract static ECDH parameters and abort if ServerKeyExchange + * is not needed. */ + if( mbedtls_ssl_ciphersuite_no_pfs( ciphersuite_info ) ) { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "server key not ECDH capable" ) ); - return( MBEDTLS_ERR_SSL_PK_TYPE_MISMATCH ); + /* For suites involving ECDH, extract DH parameters + * from certificate at this point. */ +#if defined(MBEDTLS_KEY_EXCHANGE__SOME__ECDH_ENABLED) + if( mbedtls_ssl_ciphersuite_uses_ecdh( ciphersuite_info ) ) + { + ssl_get_ecdh_params_from_cert( ssl ); + } +#endif /* MBEDTLS_KEY_EXCHANGE__SOME__ECDH_ENABLED */ + + /* Key exchanges not involving ephemeral keys don't use + * ServerKeyExchange, so end here. */ + MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= skip write server key exchange" ) ); + ssl->state++; + return( 0 ); + } +#endif /* MBEDTLS_KEY_EXCHANGE__SOME_NON_PFS__ENABLED */ + +#if defined(MBEDTLS_KEY_EXCHANGE__WITH_SERVER_SIGNATURE__ENABLED) && \ + defined(MBEDTLS_SSL_ASYNC_PRIVATE) + /* If we have already prepared the message and there is an ongoing + * signature operation, resume signing. */ + if( ssl->handshake->async_in_progress != 0 ) + { + MBEDTLS_SSL_DEBUG_MSG( 2, ( "resuming signature operation" ) ); + ret = ssl_resume_server_key_exchange( ssl, &signature_len ); + } + else +#endif /* defined(MBEDTLS_KEY_EXCHANGE__WITH_SERVER_SIGNATURE__ENABLED) && + defined(MBEDTLS_SSL_ASYNC_PRIVATE) */ + { + /* ServerKeyExchange is needed. Prepare the message. */ + ret = ssl_prepare_server_key_exchange( ssl, &signature_len ); } - if( ( ret = mbedtls_ecdh_get_params( &ssl->handshake->ecdh_ctx, - mbedtls_pk_ec( *mbedtls_ssl_own_key( ssl ) ), - MBEDTLS_ECDH_OURS ) ) != 0 ) + if( ret != 0 ) { - MBEDTLS_SSL_DEBUG_RET( 1, ( "mbedtls_ecdh_get_params" ), ret ); + /* If we're starting to write a new message, set ssl->out_msglen + * to 0. But if we're resuming after an asynchronous message, + * out_msglen is the amount of data written so far and mst be + * preserved. */ + if( ret == MBEDTLS_ERR_SSL_ASYNC_IN_PROGRESS ) + MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= write server key exchange (pending)" ) ); + else + ssl->out_msglen = 0; return( ret ); } + /* If there is a signature, write its length. + * ssl_prepare_server_key_exchange already wrote the signature + * itself at its proper place in the output buffer. */ +#if defined(MBEDTLS_KEY_EXCHANGE__WITH_SERVER_SIGNATURE__ENABLED) + if( signature_len != 0 ) + { + ssl->out_msg[ssl->out_msglen++] = (unsigned char)( signature_len >> 8 ); + ssl->out_msg[ssl->out_msglen++] = (unsigned char)( signature_len ); + + MBEDTLS_SSL_DEBUG_BUF( 3, "my signature", + ssl->out_msg + ssl->out_msglen, + signature_len ); + + /* Skip over the already-written signature */ + ssl->out_msglen += signature_len; + } +#endif /* MBEDTLS_KEY_EXCHANGE__WITH_SERVER_SIGNATURE__ENABLED */ + + /* Add header and send. */ + ssl->out_msgtype = MBEDTLS_SSL_MSG_HANDSHAKE; + ssl->out_msg[0] = MBEDTLS_SSL_HS_SERVER_KEY_EXCHANGE; + + ssl->state++; + + if( ( ret = mbedtls_ssl_write_handshake_msg( ssl ) ) != 0 ) + { + MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_write_handshake_msg", ret ); + return( ret ); + } + + MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= write server key exchange" ) ); return( 0 ); } -#endif /* MBEDTLS_KEY_EXCHANGE_ECDH_RSA_ENABLED) || - MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA_ENABLED */ #if defined(MBEDTLS_KEY_EXCHANGE__WITH_SERVER_SIGNATURE__ENABLED) && \ defined(MBEDTLS_SSL_ASYNC_PRIVATE) @@ -3419,106 +3475,226 @@ curve_matching_done: return( 0 ); } -/* Prepare the ServerKeyExchange message and send it. For ciphersuites - * that do not include a ServerKeyExchange message, do nothing. Either - * way, if successful, move on to the next step in the SSL state - * machine. */ -static int ssl_write_server_key_exchange( mbedtls_ssl_context *ssl ) +/* + * SERVER HANDSHAKE STATE: Outgoing `CertificateRequest` + */ + +#if !defined(MBEDTLS_KEY_EXCHANGE__CERT_REQ_ALLOWED__ENABLED) +static int ssl_write_certificate_request( mbedtls_ssl_context *ssl ) { - int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; - size_t signature_len = 0; -#if defined(MBEDTLS_KEY_EXCHANGE__SOME_NON_PFS__ENABLED) const mbedtls_ssl_ciphersuite_t *ciphersuite_info = - ssl->handshake->ciphersuite_info; -#endif /* MBEDTLS_KEY_EXCHANGE__SOME_NON_PFS__ENABLED */ + ssl->handshake->ciphersuite_info; - MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> write server key exchange" ) ); + MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> write certificate request" ) ); -#if defined(MBEDTLS_KEY_EXCHANGE__SOME_NON_PFS__ENABLED) - /* Extract static ECDH parameters and abort if ServerKeyExchange - * is not needed. */ - if( mbedtls_ssl_ciphersuite_no_pfs( ciphersuite_info ) ) + if( !mbedtls_ssl_ciphersuite_cert_req_allowed( ciphersuite_info ) ) { - /* For suites involving ECDH, extract DH parameters - * from certificate at this point. */ -#if defined(MBEDTLS_KEY_EXCHANGE__SOME__ECDH_ENABLED) - if( mbedtls_ssl_ciphersuite_uses_ecdh( ciphersuite_info ) ) - { - ssl_get_ecdh_params_from_cert( ssl ); - } -#endif /* MBEDTLS_KEY_EXCHANGE__SOME__ECDH_ENABLED */ - - /* Key exchanges not involving ephemeral keys don't use - * ServerKeyExchange, so end here. */ - MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= skip write server key exchange" ) ); + MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= skip write certificate request" ) ); ssl->state++; return( 0 ); } -#endif /* MBEDTLS_KEY_EXCHANGE__SOME_NON_PFS__ENABLED */ -#if defined(MBEDTLS_KEY_EXCHANGE__WITH_SERVER_SIGNATURE__ENABLED) && \ - defined(MBEDTLS_SSL_ASYNC_PRIVATE) - /* If we have already prepared the message and there is an ongoing - * signature operation, resume signing. */ - if( ssl->handshake->async_in_progress != 0 ) - { - MBEDTLS_SSL_DEBUG_MSG( 2, ( "resuming signature operation" ) ); - ret = ssl_resume_server_key_exchange( ssl, &signature_len ); - } - else -#endif /* defined(MBEDTLS_KEY_EXCHANGE__WITH_SERVER_SIGNATURE__ENABLED) && - defined(MBEDTLS_SSL_ASYNC_PRIVATE) */ - { - /* ServerKeyExchange is needed. Prepare the message. */ - ret = ssl_prepare_server_key_exchange( ssl, &signature_len ); - } + MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) ); + return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); +} +#else /* !MBEDTLS_KEY_EXCHANGE__CERT_REQ_ALLOWED__ENABLED */ +static int ssl_write_certificate_request( mbedtls_ssl_context *ssl ) +{ + int ret = MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE; + const mbedtls_ssl_ciphersuite_t *ciphersuite_info = + ssl->handshake->ciphersuite_info; + size_t dn_size, total_dn_size; /* excluding length bytes */ + size_t ct_len, sa_len; /* including length bytes */ + unsigned char *buf, *p; + const unsigned char * const end = ssl->out_msg + MBEDTLS_SSL_OUT_CONTENT_LEN; + const mbedtls_x509_crt *crt; + int authmode; - if( ret != 0 ) - { - /* If we're starting to write a new message, set ssl->out_msglen - * to 0. But if we're resuming after an asynchronous message, - * out_msglen is the amount of data written so far and mst be - * preserved. */ - if( ret == MBEDTLS_ERR_SSL_ASYNC_IN_PROGRESS ) - MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= write server key exchange (pending)" ) ); - else - ssl->out_msglen = 0; - return( ret ); - } - - /* If there is a signature, write its length. - * ssl_prepare_server_key_exchange already wrote the signature - * itself at its proper place in the output buffer. */ -#if defined(MBEDTLS_KEY_EXCHANGE__WITH_SERVER_SIGNATURE__ENABLED) - if( signature_len != 0 ) - { - ssl->out_msg[ssl->out_msglen++] = (unsigned char)( signature_len >> 8 ); - ssl->out_msg[ssl->out_msglen++] = (unsigned char)( signature_len ); - - MBEDTLS_SSL_DEBUG_BUF( 3, "my signature", - ssl->out_msg + ssl->out_msglen, - signature_len ); - - /* Skip over the already-written signature */ - ssl->out_msglen += signature_len; - } -#endif /* MBEDTLS_KEY_EXCHANGE__WITH_SERVER_SIGNATURE__ENABLED */ - - /* Add header and send. */ - ssl->out_msgtype = MBEDTLS_SSL_MSG_HANDSHAKE; - ssl->out_msg[0] = MBEDTLS_SSL_HS_SERVER_KEY_EXCHANGE; + MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> write certificate request" ) ); ssl->state++; - if( ( ret = mbedtls_ssl_write_handshake_msg( ssl ) ) != 0 ) +#if defined(MBEDTLS_SSL_SERVER_NAME_INDICATION) + if( ssl->handshake->sni_authmode != MBEDTLS_SSL_VERIFY_UNSET ) + authmode = ssl->handshake->sni_authmode; + else +#endif + authmode = ssl->conf->authmode; + + if( !mbedtls_ssl_ciphersuite_cert_req_allowed( ciphersuite_info ) || + authmode == MBEDTLS_SSL_VERIFY_NONE ) { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_write_handshake_msg", ret ); + MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= skip write certificate request" ) ); + return( 0 ); + } + + /* + * 0 . 0 handshake type + * 1 . 3 handshake length + * 4 . 4 cert type count + * 5 .. m-1 cert types + * m .. m+1 sig alg length (TLS 1.2 only) + * m+1 .. n-1 SignatureAndHashAlgorithms (TLS 1.2 only) + * n .. n+1 length of all DNs + * n+2 .. n+3 length of DN 1 + * n+4 .. ... Distinguished Name #1 + * ... .. ... length of DN 2, etc. + */ + buf = ssl->out_msg; + p = buf + 4; + + /* + * Supported certificate types + * + * ClientCertificateType certificate_types<1..2^8-1>; + * enum { (255) } ClientCertificateType; + */ + ct_len = 0; + +#if defined(MBEDTLS_RSA_C) + p[1 + ct_len++] = MBEDTLS_SSL_CERT_TYPE_RSA_SIGN; +#endif +#if defined(MBEDTLS_ECDSA_C) + p[1 + ct_len++] = MBEDTLS_SSL_CERT_TYPE_ECDSA_SIGN; +#endif + + p[0] = (unsigned char) ct_len++; + p += ct_len; + + sa_len = 0; +#if defined(MBEDTLS_SSL_PROTO_TLS1_2) + /* + * Add signature_algorithms for verify (TLS 1.2) + * + * SignatureAndHashAlgorithm supported_signature_algorithms<2..2^16-2>; + * + * struct { + * HashAlgorithm hash; + * SignatureAlgorithm signature; + * } SignatureAndHashAlgorithm; + * + * enum { (255) } HashAlgorithm; + * enum { (255) } SignatureAlgorithm; + */ + if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_3 ) + { + const int *cur; + + /* + * Supported signature algorithms + */ + for( cur = ssl->conf->sig_hashes; *cur != MBEDTLS_MD_NONE; cur++ ) + { + unsigned char hash = mbedtls_ssl_hash_from_md_alg( *cur ); + + if( MBEDTLS_SSL_HASH_NONE == hash || mbedtls_ssl_set_calc_verify_md( ssl, hash ) ) + continue; + +#if defined(MBEDTLS_RSA_C) + p[2 + sa_len++] = hash; + p[2 + sa_len++] = MBEDTLS_SSL_SIG_RSA; +#endif +#if defined(MBEDTLS_ECDSA_C) + p[2 + sa_len++] = hash; + p[2 + sa_len++] = MBEDTLS_SSL_SIG_ECDSA; +#endif + } + + p[0] = (unsigned char)( sa_len >> 8 ); + p[1] = (unsigned char)( sa_len ); + sa_len += 2; + p += sa_len; + } +#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */ + + /* + * DistinguishedName certificate_authorities<0..2^16-1>; + * opaque DistinguishedName<1..2^16-1>; + */ + p += 2; + + total_dn_size = 0; + + if( ssl->conf->cert_req_ca_list == MBEDTLS_SSL_CERT_REQ_CA_LIST_ENABLED ) + { + /* NOTE: If trusted certificates are provisioned + * via a CA callback (configured through + * `mbedtls_ssl_conf_ca_cb()`, then the + * CertificateRequest is currently left empty. */ + +#if defined(MBEDTLS_SSL_SERVER_NAME_INDICATION) + if( ssl->handshake->sni_ca_chain != NULL ) + crt = ssl->handshake->sni_ca_chain; + else +#endif + crt = ssl->conf->ca_chain; + + while( crt != NULL && crt->version != 0 ) + { + dn_size = crt->subject_raw.len; + + if( end < p || + (size_t)( end - p ) < dn_size || + (size_t)( end - p ) < 2 + dn_size ) + { + MBEDTLS_SSL_DEBUG_MSG( 1, ( "skipping CAs: buffer too short" ) ); + break; + } + + *p++ = (unsigned char)( dn_size >> 8 ); + *p++ = (unsigned char)( dn_size ); + memcpy( p, crt->subject_raw.p, dn_size ); + p += dn_size; + + MBEDTLS_SSL_DEBUG_BUF( 3, "requested DN", p - dn_size, dn_size ); + + total_dn_size += 2 + dn_size; + crt = crt->next; + } + } + + ssl->out_msglen = p - buf; + ssl->out_msgtype = MBEDTLS_SSL_MSG_HANDSHAKE; + ssl->out_msg[0] = MBEDTLS_SSL_HS_CERTIFICATE_REQUEST; + ssl->out_msg[4 + ct_len + sa_len] = (unsigned char)( total_dn_size >> 8 ); + ssl->out_msg[5 + ct_len + sa_len] = (unsigned char)( total_dn_size ); + + ret = mbedtls_ssl_write_handshake_msg( ssl ); + + MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= write certificate request" ) ); + + return( ret ); +} +#endif /* MBEDTLS_KEY_EXCHANGE__CERT_REQ_ALLOWED__ENABLED */ + +#if defined(MBEDTLS_KEY_EXCHANGE_ECDH_RSA_ENABLED) || \ + defined(MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA_ENABLED) +static int ssl_get_ecdh_params_from_cert( mbedtls_ssl_context *ssl ) +{ + int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; + + if( ! mbedtls_pk_can_do( mbedtls_ssl_own_key( ssl ), MBEDTLS_PK_ECKEY ) ) + { + MBEDTLS_SSL_DEBUG_MSG( 1, ( "server key not ECDH capable" ) ); + return( MBEDTLS_ERR_SSL_PK_TYPE_MISMATCH ); + } + + if( ( ret = mbedtls_ecdh_get_params( &ssl->handshake->ecdh_ctx, + mbedtls_pk_ec( *mbedtls_ssl_own_key( ssl ) ), + MBEDTLS_ECDH_OURS ) ) != 0 ) + { + MBEDTLS_SSL_DEBUG_RET( 1, ( "mbedtls_ecdh_get_params" ), ret ); return( ret ); } - MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= write server key exchange" ) ); return( 0 ); } +#endif /* MBEDTLS_KEY_EXCHANGE_ECDH_RSA_ENABLED) || + MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA_ENABLED */ + +/* + * SERVER HANDSHAKE STATE: Outgoing `ServerHelloDone` + */ static int ssl_write_server_hello_done( mbedtls_ssl_context *ssl ) { @@ -3557,6 +3733,360 @@ static int ssl_write_server_hello_done( mbedtls_ssl_context *ssl ) return( 0 ); } +/* + * SERVER HANDSHAKE STATE: Incoming `Certificate` + * + * This is shared with the client-side and implemented in ssl_12_gen.c. + */ + +/* + * SERVER HANDSHAKE STATE: Incoming `ClientKeyExchange` + */ + +#if defined(MBEDTLS_KEY_EXCHANGE_DHE_RSA_ENABLED) || \ + defined(MBEDTLS_KEY_EXCHANGE_DHE_PSK_ENABLED) +static int ssl_parse_client_dh_public( mbedtls_ssl_context *ssl, + unsigned char **p, + const unsigned char *end ); +#endif /* MBEDTLS_KEY_EXCHANGE_DHE_RSA_ENABLED || + MBEDTLS_KEY_EXCHANGE_DHE_PSK_ENABLED */ + +#if defined(MBEDTLS_KEY_EXCHANGE_RSA_ENABLED) || \ + defined(MBEDTLS_KEY_EXCHANGE_RSA_PSK_ENABLED) + +#if defined(MBEDTLS_SSL_ASYNC_PRIVATE) +static int ssl_resume_decrypt_pms( mbedtls_ssl_context *ssl, + unsigned char *peer_pms, + size_t *peer_pmslen, + size_t peer_pmssize ); +#endif /* MBEDTLS_SSL_ASYNC_PRIVATE */ + +static int ssl_decrypt_encrypted_pms( mbedtls_ssl_context *ssl, + const unsigned char *p, + const unsigned char *end, + unsigned char *peer_pms, + size_t *peer_pmslen, + size_t peer_pmssize ); + +static int ssl_parse_encrypted_pms( mbedtls_ssl_context *ssl, + const unsigned char *p, + const unsigned char *end, + size_t pms_offset ); +#endif /* MBEDTLS_KEY_EXCHANGE_RSA_ENABLED || + MBEDTLS_KEY_EXCHANGE_RSA_PSK_ENABLED */ + +#if defined(MBEDTLS_KEY_EXCHANGE__SOME__PSK_ENABLED) +static int ssl_parse_client_psk_identity( mbedtls_ssl_context *ssl, + unsigned char **p, + const unsigned char *end ); +#endif /* MBEDTLS_KEY_EXCHANGE__SOME__PSK_ENABLED */ + + +static int ssl_parse_client_key_exchange( mbedtls_ssl_context *ssl ) +{ + int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; + const mbedtls_ssl_ciphersuite_t *ciphersuite_info; + unsigned char *p, *end; + + ciphersuite_info = ssl->handshake->ciphersuite_info; + + MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> parse client key exchange" ) ); + +#if defined(MBEDTLS_SSL_ASYNC_PRIVATE) && \ + ( defined(MBEDTLS_KEY_EXCHANGE_RSA_ENABLED) || \ + defined(MBEDTLS_KEY_EXCHANGE_RSA_PSK_ENABLED) ) + if( ( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_RSA_PSK || + ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_RSA ) && + ( ssl->handshake->async_in_progress != 0 ) ) + { + /* We've already read a record and there is an asynchronous + * operation in progress to decrypt it. So skip reading the + * record. */ + MBEDTLS_SSL_DEBUG_MSG( 3, ( "will resume decryption of previously-read record" ) ); + } + else +#endif + if( ( ret = mbedtls_ssl_read_record( ssl, 1 ) ) != 0 ) + { + MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_read_record", ret ); + return( ret ); + } + + p = ssl->in_msg + mbedtls_ssl_hs_hdr_len( ssl ); + end = ssl->in_msg + ssl->in_hslen; + + if( ssl->in_msgtype != MBEDTLS_SSL_MSG_HANDSHAKE ) + { + MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client key exchange message" ) ); + return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE ); + } + + if( ssl->in_msg[0] != MBEDTLS_SSL_HS_CLIENT_KEY_EXCHANGE ) + { + MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client key exchange message" ) ); + return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE ); + } + +#if defined(MBEDTLS_KEY_EXCHANGE_DHE_RSA_ENABLED) + if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_DHE_RSA ) + { + if( ( ret = ssl_parse_client_dh_public( ssl, &p, end ) ) != 0 ) + { + MBEDTLS_SSL_DEBUG_RET( 1, ( "ssl_parse_client_dh_public" ), ret ); + return( ret ); + } + + if( p != end ) + { + MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client key exchange" ) ); + return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE ); + } + + if( ( ret = mbedtls_dhm_calc_secret( &ssl->handshake->dhm_ctx, + ssl->handshake->premaster, + MBEDTLS_PREMASTER_SIZE, + &ssl->handshake->pmslen, + ssl->conf->f_rng, ssl->conf->p_rng ) ) != 0 ) + { + MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_dhm_calc_secret", ret ); + return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE_CS ); + } + + MBEDTLS_SSL_DEBUG_MPI( 3, "DHM: K ", &ssl->handshake->dhm_ctx.K ); + } + else +#endif /* MBEDTLS_KEY_EXCHANGE_DHE_RSA_ENABLED */ +#if defined(MBEDTLS_KEY_EXCHANGE_ECDHE_RSA_ENABLED) || \ + defined(MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED) || \ + defined(MBEDTLS_KEY_EXCHANGE_ECDH_RSA_ENABLED) || \ + defined(MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA_ENABLED) + if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDHE_RSA || + ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA || + ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDH_RSA || + ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA ) + { + if( ( ret = mbedtls_ecdh_read_public( &ssl->handshake->ecdh_ctx, + p, end - p) ) != 0 ) + { + MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ecdh_read_public", ret ); + return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE_RP ); + } + + MBEDTLS_SSL_DEBUG_ECDH( 3, &ssl->handshake->ecdh_ctx, + MBEDTLS_DEBUG_ECDH_QP ); + + if( ( ret = mbedtls_ecdh_calc_secret( &ssl->handshake->ecdh_ctx, + &ssl->handshake->pmslen, + ssl->handshake->premaster, + MBEDTLS_MPI_MAX_SIZE, + ssl->conf->f_rng, ssl->conf->p_rng ) ) != 0 ) + { + MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ecdh_calc_secret", ret ); + return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE_CS ); + } + + MBEDTLS_SSL_DEBUG_ECDH( 3, &ssl->handshake->ecdh_ctx, + MBEDTLS_DEBUG_ECDH_Z ); + } + else +#endif /* MBEDTLS_KEY_EXCHANGE_ECDHE_RSA_ENABLED || + MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED || + MBEDTLS_KEY_EXCHANGE_ECDH_RSA_ENABLED || + MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA_ENABLED */ +#if defined(MBEDTLS_KEY_EXCHANGE_PSK_ENABLED) + if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_PSK ) + { + if( ( ret = ssl_parse_client_psk_identity( ssl, &p, end ) ) != 0 ) + { + MBEDTLS_SSL_DEBUG_RET( 1, ( "ssl_parse_client_psk_identity" ), ret ); + return( ret ); + } + + if( p != end ) + { + MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client key exchange" ) ); + return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE ); + } + +#if defined(MBEDTLS_USE_PSA_CRYPTO) + /* For opaque PSKs, we perform the PSK-to-MS derivation atomatically + * and skip the intermediate PMS. */ + if( ssl_use_opaque_psk( ssl ) == 1 ) + MBEDTLS_SSL_DEBUG_MSG( 1, ( "skip PMS generation for opaque PSK" ) ); + else +#endif /* MBEDTLS_USE_PSA_CRYPTO */ + if( ( ret = mbedtls_ssl_psk_derive_premaster( ssl, + ciphersuite_info->key_exchange ) ) != 0 ) + { + MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_psk_derive_premaster", ret ); + return( ret ); + } + } + else +#endif /* MBEDTLS_KEY_EXCHANGE_PSK_ENABLED */ +#if defined(MBEDTLS_KEY_EXCHANGE_RSA_PSK_ENABLED) + if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_RSA_PSK ) + { +#if defined(MBEDTLS_SSL_ASYNC_PRIVATE) + if ( ssl->handshake->async_in_progress != 0 ) + { + /* There is an asynchronous operation in progress to + * decrypt the encrypted premaster secret, so skip + * directly to resuming this operation. */ + MBEDTLS_SSL_DEBUG_MSG( 3, ( "PSK identity already parsed" ) ); + /* Update p to skip the PSK identity. ssl_parse_encrypted_pms + * won't actually use it, but maintain p anyway for robustness. */ + p += ssl->conf->psk_identity_len + 2; + } + else +#endif /* MBEDTLS_SSL_ASYNC_PRIVATE */ + if( ( ret = ssl_parse_client_psk_identity( ssl, &p, end ) ) != 0 ) + { + MBEDTLS_SSL_DEBUG_RET( 1, ( "ssl_parse_client_psk_identity" ), ret ); + return( ret ); + } + +#if defined(MBEDTLS_USE_PSA_CRYPTO) + /* Opaque PSKs are currently only supported for PSK-only. */ + if( ssl_use_opaque_psk( ssl ) == 1 ) + return( MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE ); +#endif + + if( ( ret = ssl_parse_encrypted_pms( ssl, p, end, 2 ) ) != 0 ) + { + MBEDTLS_SSL_DEBUG_RET( 1, ( "ssl_parse_encrypted_pms" ), ret ); + return( ret ); + } + + if( ( ret = mbedtls_ssl_psk_derive_premaster( ssl, + ciphersuite_info->key_exchange ) ) != 0 ) + { + MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_psk_derive_premaster", ret ); + return( ret ); + } + } + else +#endif /* MBEDTLS_KEY_EXCHANGE_RSA_PSK_ENABLED */ +#if defined(MBEDTLS_KEY_EXCHANGE_DHE_PSK_ENABLED) + if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_DHE_PSK ) + { + if( ( ret = ssl_parse_client_psk_identity( ssl, &p, end ) ) != 0 ) + { + MBEDTLS_SSL_DEBUG_RET( 1, ( "ssl_parse_client_psk_identity" ), ret ); + return( ret ); + } + if( ( ret = ssl_parse_client_dh_public( ssl, &p, end ) ) != 0 ) + { + MBEDTLS_SSL_DEBUG_RET( 1, ( "ssl_parse_client_dh_public" ), ret ); + return( ret ); + } + +#if defined(MBEDTLS_USE_PSA_CRYPTO) + /* Opaque PSKs are currently only supported for PSK-only. */ + if( ssl_use_opaque_psk( ssl ) == 1 ) + return( MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE ); +#endif + + if( p != end ) + { + MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client key exchange" ) ); + return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE ); + } + + if( ( ret = mbedtls_ssl_psk_derive_premaster( ssl, + ciphersuite_info->key_exchange ) ) != 0 ) + { + MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_psk_derive_premaster", ret ); + return( ret ); + } + } + else +#endif /* MBEDTLS_KEY_EXCHANGE_DHE_PSK_ENABLED */ +#if defined(MBEDTLS_KEY_EXCHANGE_ECDHE_PSK_ENABLED) + if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDHE_PSK ) + { + if( ( ret = ssl_parse_client_psk_identity( ssl, &p, end ) ) != 0 ) + { + MBEDTLS_SSL_DEBUG_RET( 1, ( "ssl_parse_client_psk_identity" ), ret ); + return( ret ); + } + + if( ( ret = mbedtls_ecdh_read_public( &ssl->handshake->ecdh_ctx, + p, end - p ) ) != 0 ) + { + MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ecdh_read_public", ret ); + return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE_RP ); + } + +#if defined(MBEDTLS_USE_PSA_CRYPTO) + /* Opaque PSKs are currently only supported for PSK-only. */ + if( ssl_use_opaque_psk( ssl ) == 1 ) + return( MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE ); +#endif + + MBEDTLS_SSL_DEBUG_ECDH( 3, &ssl->handshake->ecdh_ctx, + MBEDTLS_DEBUG_ECDH_QP ); + + if( ( ret = mbedtls_ssl_psk_derive_premaster( ssl, + ciphersuite_info->key_exchange ) ) != 0 ) + { + MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_psk_derive_premaster", ret ); + return( ret ); + } + } + else +#endif /* MBEDTLS_KEY_EXCHANGE_ECDHE_PSK_ENABLED */ +#if defined(MBEDTLS_KEY_EXCHANGE_RSA_ENABLED) + if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_RSA ) + { + if( ( ret = ssl_parse_encrypted_pms( ssl, p, end, 0 ) ) != 0 ) + { + MBEDTLS_SSL_DEBUG_RET( 1, ( "ssl_parse_parse_encrypted_pms_secret" ), ret ); + return( ret ); + } + } + else +#endif /* MBEDTLS_KEY_EXCHANGE_RSA_ENABLED */ +#if defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED) + if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECJPAKE ) + { + ret = mbedtls_ecjpake_read_round_two( &ssl->handshake->ecjpake_ctx, + p, end - p ); + if( ret != 0 ) + { + MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ecjpake_read_round_two", ret ); + return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_KEY_EXCHANGE ); + } + + ret = mbedtls_ecjpake_derive_secret( &ssl->handshake->ecjpake_ctx, + ssl->handshake->premaster, 32, &ssl->handshake->pmslen, + ssl->conf->f_rng, ssl->conf->p_rng ); + if( ret != 0 ) + { + MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ecjpake_derive_secret", ret ); + return( ret ); + } + } + else +#endif /* MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED */ + { + MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) ); + return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); + } + + if( ( ret = mbedtls_ssl_derive_keys( ssl ) ) != 0 ) + { + MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_derive_keys", ret ); + return( ret ); + } + + ssl->state++; + + MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= parse client key exchange" ) ); + + return( 0 ); +} + #if defined(MBEDTLS_KEY_EXCHANGE_DHE_RSA_ENABLED) || \ defined(MBEDTLS_KEY_EXCHANGE_DHE_PSK_ENABLED) static int ssl_parse_client_dh_public( mbedtls_ssl_context *ssl, unsigned char **p, @@ -3867,310 +4397,9 @@ static int ssl_parse_client_psk_identity( mbedtls_ssl_context *ssl, unsigned cha } #endif /* MBEDTLS_KEY_EXCHANGE__SOME__PSK_ENABLED */ -static int ssl_parse_client_key_exchange( mbedtls_ssl_context *ssl ) -{ - int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; - const mbedtls_ssl_ciphersuite_t *ciphersuite_info; - unsigned char *p, *end; - - ciphersuite_info = ssl->handshake->ciphersuite_info; - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> parse client key exchange" ) ); - -#if defined(MBEDTLS_SSL_ASYNC_PRIVATE) && \ - ( defined(MBEDTLS_KEY_EXCHANGE_RSA_ENABLED) || \ - defined(MBEDTLS_KEY_EXCHANGE_RSA_PSK_ENABLED) ) - if( ( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_RSA_PSK || - ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_RSA ) && - ( ssl->handshake->async_in_progress != 0 ) ) - { - /* We've already read a record and there is an asynchronous - * operation in progress to decrypt it. So skip reading the - * record. */ - MBEDTLS_SSL_DEBUG_MSG( 3, ( "will resume decryption of previously-read record" ) ); - } - else -#endif - if( ( ret = mbedtls_ssl_read_record( ssl, 1 ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_read_record", ret ); - return( ret ); - } - - p = ssl->in_msg + mbedtls_ssl_hs_hdr_len( ssl ); - end = ssl->in_msg + ssl->in_hslen; - - if( ssl->in_msgtype != MBEDTLS_SSL_MSG_HANDSHAKE ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client key exchange message" ) ); - return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE ); - } - - if( ssl->in_msg[0] != MBEDTLS_SSL_HS_CLIENT_KEY_EXCHANGE ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client key exchange message" ) ); - return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE ); - } - -#if defined(MBEDTLS_KEY_EXCHANGE_DHE_RSA_ENABLED) - if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_DHE_RSA ) - { - if( ( ret = ssl_parse_client_dh_public( ssl, &p, end ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, ( "ssl_parse_client_dh_public" ), ret ); - return( ret ); - } - - if( p != end ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client key exchange" ) ); - return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE ); - } - - if( ( ret = mbedtls_dhm_calc_secret( &ssl->handshake->dhm_ctx, - ssl->handshake->premaster, - MBEDTLS_PREMASTER_SIZE, - &ssl->handshake->pmslen, - ssl->conf->f_rng, ssl->conf->p_rng ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_dhm_calc_secret", ret ); - return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE_CS ); - } - - MBEDTLS_SSL_DEBUG_MPI( 3, "DHM: K ", &ssl->handshake->dhm_ctx.K ); - } - else -#endif /* MBEDTLS_KEY_EXCHANGE_DHE_RSA_ENABLED */ -#if defined(MBEDTLS_KEY_EXCHANGE_ECDHE_RSA_ENABLED) || \ - defined(MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED) || \ - defined(MBEDTLS_KEY_EXCHANGE_ECDH_RSA_ENABLED) || \ - defined(MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA_ENABLED) - if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDHE_RSA || - ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA || - ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDH_RSA || - ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA ) - { - if( ( ret = mbedtls_ecdh_read_public( &ssl->handshake->ecdh_ctx, - p, end - p) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ecdh_read_public", ret ); - return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE_RP ); - } - - MBEDTLS_SSL_DEBUG_ECDH( 3, &ssl->handshake->ecdh_ctx, - MBEDTLS_DEBUG_ECDH_QP ); - - if( ( ret = mbedtls_ecdh_calc_secret( &ssl->handshake->ecdh_ctx, - &ssl->handshake->pmslen, - ssl->handshake->premaster, - MBEDTLS_MPI_MAX_SIZE, - ssl->conf->f_rng, ssl->conf->p_rng ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ecdh_calc_secret", ret ); - return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE_CS ); - } - - MBEDTLS_SSL_DEBUG_ECDH( 3, &ssl->handshake->ecdh_ctx, - MBEDTLS_DEBUG_ECDH_Z ); - } - else -#endif /* MBEDTLS_KEY_EXCHANGE_ECDHE_RSA_ENABLED || - MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED || - MBEDTLS_KEY_EXCHANGE_ECDH_RSA_ENABLED || - MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA_ENABLED */ -#if defined(MBEDTLS_KEY_EXCHANGE_PSK_ENABLED) - if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_PSK ) - { - if( ( ret = ssl_parse_client_psk_identity( ssl, &p, end ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, ( "ssl_parse_client_psk_identity" ), ret ); - return( ret ); - } - - if( p != end ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client key exchange" ) ); - return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE ); - } - -#if defined(MBEDTLS_USE_PSA_CRYPTO) - /* For opaque PSKs, we perform the PSK-to-MS derivation atomatically - * and skip the intermediate PMS. */ - if( ssl_use_opaque_psk( ssl ) == 1 ) - MBEDTLS_SSL_DEBUG_MSG( 1, ( "skip PMS generation for opaque PSK" ) ); - else -#endif /* MBEDTLS_USE_PSA_CRYPTO */ - if( ( ret = mbedtls_ssl_psk_derive_premaster( ssl, - ciphersuite_info->key_exchange ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_psk_derive_premaster", ret ); - return( ret ); - } - } - else -#endif /* MBEDTLS_KEY_EXCHANGE_PSK_ENABLED */ -#if defined(MBEDTLS_KEY_EXCHANGE_RSA_PSK_ENABLED) - if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_RSA_PSK ) - { -#if defined(MBEDTLS_SSL_ASYNC_PRIVATE) - if ( ssl->handshake->async_in_progress != 0 ) - { - /* There is an asynchronous operation in progress to - * decrypt the encrypted premaster secret, so skip - * directly to resuming this operation. */ - MBEDTLS_SSL_DEBUG_MSG( 3, ( "PSK identity already parsed" ) ); - /* Update p to skip the PSK identity. ssl_parse_encrypted_pms - * won't actually use it, but maintain p anyway for robustness. */ - p += ssl->conf->psk_identity_len + 2; - } - else -#endif /* MBEDTLS_SSL_ASYNC_PRIVATE */ - if( ( ret = ssl_parse_client_psk_identity( ssl, &p, end ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, ( "ssl_parse_client_psk_identity" ), ret ); - return( ret ); - } - -#if defined(MBEDTLS_USE_PSA_CRYPTO) - /* Opaque PSKs are currently only supported for PSK-only. */ - if( ssl_use_opaque_psk( ssl ) == 1 ) - return( MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE ); -#endif - - if( ( ret = ssl_parse_encrypted_pms( ssl, p, end, 2 ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, ( "ssl_parse_encrypted_pms" ), ret ); - return( ret ); - } - - if( ( ret = mbedtls_ssl_psk_derive_premaster( ssl, - ciphersuite_info->key_exchange ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_psk_derive_premaster", ret ); - return( ret ); - } - } - else -#endif /* MBEDTLS_KEY_EXCHANGE_RSA_PSK_ENABLED */ -#if defined(MBEDTLS_KEY_EXCHANGE_DHE_PSK_ENABLED) - if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_DHE_PSK ) - { - if( ( ret = ssl_parse_client_psk_identity( ssl, &p, end ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, ( "ssl_parse_client_psk_identity" ), ret ); - return( ret ); - } - if( ( ret = ssl_parse_client_dh_public( ssl, &p, end ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, ( "ssl_parse_client_dh_public" ), ret ); - return( ret ); - } - -#if defined(MBEDTLS_USE_PSA_CRYPTO) - /* Opaque PSKs are currently only supported for PSK-only. */ - if( ssl_use_opaque_psk( ssl ) == 1 ) - return( MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE ); -#endif - - if( p != end ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client key exchange" ) ); - return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE ); - } - - if( ( ret = mbedtls_ssl_psk_derive_premaster( ssl, - ciphersuite_info->key_exchange ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_psk_derive_premaster", ret ); - return( ret ); - } - } - else -#endif /* MBEDTLS_KEY_EXCHANGE_DHE_PSK_ENABLED */ -#if defined(MBEDTLS_KEY_EXCHANGE_ECDHE_PSK_ENABLED) - if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDHE_PSK ) - { - if( ( ret = ssl_parse_client_psk_identity( ssl, &p, end ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, ( "ssl_parse_client_psk_identity" ), ret ); - return( ret ); - } - - if( ( ret = mbedtls_ecdh_read_public( &ssl->handshake->ecdh_ctx, - p, end - p ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ecdh_read_public", ret ); - return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE_RP ); - } - -#if defined(MBEDTLS_USE_PSA_CRYPTO) - /* Opaque PSKs are currently only supported for PSK-only. */ - if( ssl_use_opaque_psk( ssl ) == 1 ) - return( MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE ); -#endif - - MBEDTLS_SSL_DEBUG_ECDH( 3, &ssl->handshake->ecdh_ctx, - MBEDTLS_DEBUG_ECDH_QP ); - - if( ( ret = mbedtls_ssl_psk_derive_premaster( ssl, - ciphersuite_info->key_exchange ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_psk_derive_premaster", ret ); - return( ret ); - } - } - else -#endif /* MBEDTLS_KEY_EXCHANGE_ECDHE_PSK_ENABLED */ -#if defined(MBEDTLS_KEY_EXCHANGE_RSA_ENABLED) - if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_RSA ) - { - if( ( ret = ssl_parse_encrypted_pms( ssl, p, end, 0 ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, ( "ssl_parse_parse_encrypted_pms_secret" ), ret ); - return( ret ); - } - } - else -#endif /* MBEDTLS_KEY_EXCHANGE_RSA_ENABLED */ -#if defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED) - if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECJPAKE ) - { - ret = mbedtls_ecjpake_read_round_two( &ssl->handshake->ecjpake_ctx, - p, end - p ); - if( ret != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ecjpake_read_round_two", ret ); - return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_KEY_EXCHANGE ); - } - - ret = mbedtls_ecjpake_derive_secret( &ssl->handshake->ecjpake_ctx, - ssl->handshake->premaster, 32, &ssl->handshake->pmslen, - ssl->conf->f_rng, ssl->conf->p_rng ); - if( ret != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ecjpake_derive_secret", ret ); - return( ret ); - } - } - else -#endif /* MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED */ - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) ); - return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); - } - - if( ( ret = mbedtls_ssl_derive_keys( ssl ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_derive_keys", ret ); - return( ret ); - } - - ssl->state++; - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= parse client key exchange" ) ); - - return( 0 ); -} +/* + * SERVER HANDSHAKE STATE: Incoming `CertificateVerify` + */ #if !defined(MBEDTLS_KEY_EXCHANGE__CERT_REQ_ALLOWED__ENABLED) static int ssl_parse_certificate_verify( mbedtls_ssl_context *ssl ) @@ -4383,6 +4612,16 @@ static int ssl_parse_certificate_verify( mbedtls_ssl_context *ssl ) } #endif /* MBEDTLS_KEY_EXCHANGE__CERT_REQ_ALLOWED__ENABLED */ +/* + * SERVER HANDSHAKE STATE: Incoming `Finished` + * + * This is shared with the client-side and implemented in ssl_12_gen.c. + */ + +/* + * SERVER HANDSHAKE STATE: Outgoing `NewSessionTicket` + */ + #if defined(MBEDTLS_SSL_SESSION_TICKETS) static int ssl_write_new_session_ticket( mbedtls_ssl_context *ssl ) { @@ -4445,133 +4684,9 @@ static int ssl_write_new_session_ticket( mbedtls_ssl_context *ssl ) #endif /* MBEDTLS_SSL_SESSION_TICKETS */ /* - * SSL handshake -- server side -- single step + * SERVER HANDSHAKE STATE: Outgoing `Finished` + * + * This is shared with the client-side and implemented in ssl_12_gen.c. */ -int mbedtls_ssl_handshake_server_step( mbedtls_ssl_context *ssl ) -{ - int ret = 0; - if( ssl->state == MBEDTLS_SSL_HANDSHAKE_OVER || ssl->handshake == NULL ) - return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "server state: %d", ssl->state ) ); - - if( ( ret = mbedtls_ssl_flush_output( ssl ) ) != 0 ) - return( ret ); - -#if defined(MBEDTLS_SSL_PROTO_DTLS) - if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM && - ssl->handshake->retransmit_state == MBEDTLS_SSL_RETRANS_SENDING ) - { - if( ( ret = mbedtls_ssl_flight_transmit( ssl ) ) != 0 ) - return( ret ); - } -#endif /* MBEDTLS_SSL_PROTO_DTLS */ - - switch( ssl->state ) - { - case MBEDTLS_SSL_HELLO_REQUEST: - ssl->state = MBEDTLS_SSL_CLIENT_HELLO; - break; - - /* - * <== ClientHello - */ - case MBEDTLS_SSL_CLIENT_HELLO: - ret = ssl_parse_client_hello( ssl ); - break; - -#if defined(MBEDTLS_SSL_PROTO_DTLS) - case MBEDTLS_SSL_SERVER_HELLO_VERIFY_REQUEST_SENT: - return( MBEDTLS_ERR_SSL_HELLO_VERIFY_REQUIRED ); -#endif - - /* - * ==> ServerHello - * Certificate - * ( ServerKeyExchange ) - * ( CertificateRequest ) - * ServerHelloDone - */ - case MBEDTLS_SSL_SERVER_HELLO: - ret = ssl_write_server_hello( ssl ); - break; - - case MBEDTLS_SSL_SERVER_CERTIFICATE: - ret = mbedtls_ssl_write_certificate( ssl ); - break; - - case MBEDTLS_SSL_SERVER_KEY_EXCHANGE: - ret = ssl_write_server_key_exchange( ssl ); - break; - - case MBEDTLS_SSL_CERTIFICATE_REQUEST: - ret = ssl_write_certificate_request( ssl ); - break; - - case MBEDTLS_SSL_SERVER_HELLO_DONE: - ret = ssl_write_server_hello_done( ssl ); - break; - - /* - * <== ( Certificate/Alert ) - * ClientKeyExchange - * ( CertificateVerify ) - * ChangeCipherSpec - * Finished - */ - case MBEDTLS_SSL_CLIENT_CERTIFICATE: - ret = mbedtls_ssl_parse_certificate( ssl ); - break; - - case MBEDTLS_SSL_CLIENT_KEY_EXCHANGE: - ret = ssl_parse_client_key_exchange( ssl ); - break; - - case MBEDTLS_SSL_CERTIFICATE_VERIFY: - ret = ssl_parse_certificate_verify( ssl ); - break; - - case MBEDTLS_SSL_CLIENT_CHANGE_CIPHER_SPEC: - ret = mbedtls_ssl_parse_change_cipher_spec( ssl ); - break; - - case MBEDTLS_SSL_CLIENT_FINISHED: - ret = mbedtls_ssl_parse_finished( ssl ); - break; - - /* - * ==> ( NewSessionTicket ) - * ChangeCipherSpec - * Finished - */ - case MBEDTLS_SSL_SERVER_CHANGE_CIPHER_SPEC: -#if defined(MBEDTLS_SSL_SESSION_TICKETS) - if( ssl->handshake->new_session_ticket != 0 ) - ret = ssl_write_new_session_ticket( ssl ); - else -#endif - ret = mbedtls_ssl_write_change_cipher_spec( ssl ); - break; - - case MBEDTLS_SSL_SERVER_FINISHED: - ret = mbedtls_ssl_write_finished( ssl ); - break; - - case MBEDTLS_SSL_FLUSH_BUFFERS: - MBEDTLS_SSL_DEBUG_MSG( 2, ( "handshake: done" ) ); - ssl->state = MBEDTLS_SSL_HANDSHAKE_WRAPUP; - break; - - case MBEDTLS_SSL_HANDSHAKE_WRAPUP: - mbedtls_ssl_handshake_wrapup( ssl ); - break; - - default: - MBEDTLS_SSL_DEBUG_MSG( 1, ( "invalid state %d", ssl->state ) ); - return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); - } - - return( ret ); -} #endif /* MBEDTLS_SSL_SRV_C */ diff --git a/library/ssl_cli.c b/library/ssl_cli.c index 0f6a26b18..d3b343925 100644 --- a/library/ssl_cli.c +++ b/library/ssl_cli.c @@ -56,3988 +56,4 @@ #include "mbedtls/platform_util.h" #endif -#if defined(MBEDTLS_KEY_EXCHANGE__SOME__PSK_ENABLED) -static int ssl_conf_has_static_psk( mbedtls_ssl_config const *conf ) -{ - if( conf->psk_identity == NULL || - conf->psk_identity_len == 0 ) - { - return( 0 ); - } - - if( conf->psk != NULL && conf->psk_len != 0 ) - return( 1 ); - -#if defined(MBEDTLS_USE_PSA_CRYPTO) - if( conf->psk_opaque != 0 ) - return( 1 ); -#endif /* MBEDTLS_USE_PSA_CRYPTO */ - - return( 0 ); -} - -#if defined(MBEDTLS_USE_PSA_CRYPTO) -static int ssl_conf_has_static_raw_psk( mbedtls_ssl_config const *conf ) -{ - if( conf->psk_identity == NULL || - conf->psk_identity_len == 0 ) - { - return( 0 ); - } - - if( conf->psk != NULL && conf->psk_len != 0 ) - return( 1 ); - - return( 0 ); -} -#endif /* MBEDTLS_USE_PSA_CRYPTO */ - -#endif /* MBEDTLS_KEY_EXCHANGE__SOME__PSK_ENABLED */ - -#if defined(MBEDTLS_SSL_SERVER_NAME_INDICATION) -static void ssl_write_hostname_ext( mbedtls_ssl_context *ssl, - unsigned char *buf, - size_t *olen ) -{ - unsigned char *p = buf; - const unsigned char *end = ssl->out_msg + MBEDTLS_SSL_OUT_CONTENT_LEN; - size_t hostname_len; - - *olen = 0; - - if( ssl->hostname == NULL ) - return; - - MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello, adding server name extension: %s", - ssl->hostname ) ); - - hostname_len = strlen( ssl->hostname ); - - if( end < p || (size_t)( end - p ) < hostname_len + 9 ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "buffer too small" ) ); - return; - } - - /* - * Sect. 3, RFC 6066 (TLS Extensions Definitions) - * - * In order to provide any of the server names, clients MAY include an - * extension of type "server_name" in the (extended) client hello. The - * "extension_data" field of this extension SHALL contain - * "ServerNameList" where: - * - * struct { - * NameType name_type; - * select (name_type) { - * case host_name: HostName; - * } name; - * } ServerName; - * - * enum { - * host_name(0), (255) - * } NameType; - * - * opaque HostName<1..2^16-1>; - * - * struct { - * ServerName server_name_list<1..2^16-1> - * } ServerNameList; - * - */ - *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_SERVERNAME >> 8 ) & 0xFF ); - *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_SERVERNAME ) & 0xFF ); - - *p++ = (unsigned char)( ( (hostname_len + 5) >> 8 ) & 0xFF ); - *p++ = (unsigned char)( ( (hostname_len + 5) ) & 0xFF ); - - *p++ = (unsigned char)( ( (hostname_len + 3) >> 8 ) & 0xFF ); - *p++ = (unsigned char)( ( (hostname_len + 3) ) & 0xFF ); - - *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_SERVERNAME_HOSTNAME ) & 0xFF ); - *p++ = (unsigned char)( ( hostname_len >> 8 ) & 0xFF ); - *p++ = (unsigned char)( ( hostname_len ) & 0xFF ); - - memcpy( p, ssl->hostname, hostname_len ); - - *olen = hostname_len + 9; -} -#endif /* MBEDTLS_SSL_SERVER_NAME_INDICATION */ - -#if defined(MBEDTLS_SSL_RENEGOTIATION) -static void ssl_write_renegotiation_ext( mbedtls_ssl_context *ssl, - unsigned char *buf, - size_t *olen ) -{ - unsigned char *p = buf; - const unsigned char *end = ssl->out_msg + MBEDTLS_SSL_OUT_CONTENT_LEN; - - *olen = 0; - - /* We're always including an TLS_EMPTY_RENEGOTIATION_INFO_SCSV in the - * initial ClientHello, in which case also adding the renegotiation - * info extension is NOT RECOMMENDED as per RFC 5746 Section 3.4. */ - if( ssl->renego_status != MBEDTLS_SSL_RENEGOTIATION_IN_PROGRESS ) - return; - - MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello, adding renegotiation extension" ) ); - - if( end < p || (size_t)( end - p ) < 5 + ssl->verify_data_len ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "buffer too small" ) ); - return; - } - - /* - * Secure renegotiation - */ - *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_RENEGOTIATION_INFO >> 8 ) & 0xFF ); - *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_RENEGOTIATION_INFO ) & 0xFF ); - - *p++ = 0x00; - *p++ = ( ssl->verify_data_len + 1 ) & 0xFF; - *p++ = ssl->verify_data_len & 0xFF; - - memcpy( p, ssl->own_verify_data, ssl->verify_data_len ); - - *olen = 5 + ssl->verify_data_len; -} -#endif /* MBEDTLS_SSL_RENEGOTIATION */ - -/* - * Only if we handle at least one key exchange that needs signatures. - */ -#if defined(MBEDTLS_SSL_PROTO_TLS1_2) && \ - defined(MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED) -static void ssl_write_signature_algorithms_ext( mbedtls_ssl_context *ssl, - unsigned char *buf, - size_t *olen ) -{ - unsigned char *p = buf; - const unsigned char *end = ssl->out_msg + MBEDTLS_SSL_OUT_CONTENT_LEN; - size_t sig_alg_len = 0; - const int *md; -#if defined(MBEDTLS_RSA_C) || defined(MBEDTLS_ECDSA_C) - unsigned char *sig_alg_list = buf + 6; -#endif - - *olen = 0; - - if( ssl->conf->max_minor_ver != MBEDTLS_SSL_MINOR_VERSION_3 ) - return; - - MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello, adding signature_algorithms extension" ) ); - - for( md = ssl->conf->sig_hashes; *md != MBEDTLS_MD_NONE; md++ ) - { -#if defined(MBEDTLS_ECDSA_C) - sig_alg_len += 2; -#endif -#if defined(MBEDTLS_RSA_C) - sig_alg_len += 2; -#endif - } - - if( end < p || (size_t)( end - p ) < sig_alg_len + 6 ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "buffer too small" ) ); - return; - } - - /* - * Prepare signature_algorithms extension (TLS 1.2) - */ - sig_alg_len = 0; - - for( md = ssl->conf->sig_hashes; *md != MBEDTLS_MD_NONE; md++ ) - { -#if defined(MBEDTLS_ECDSA_C) - sig_alg_list[sig_alg_len++] = mbedtls_ssl_hash_from_md_alg( *md ); - sig_alg_list[sig_alg_len++] = MBEDTLS_SSL_SIG_ECDSA; -#endif -#if defined(MBEDTLS_RSA_C) - sig_alg_list[sig_alg_len++] = mbedtls_ssl_hash_from_md_alg( *md ); - sig_alg_list[sig_alg_len++] = MBEDTLS_SSL_SIG_RSA; -#endif - } - - /* - * enum { - * none(0), md5(1), sha1(2), sha224(3), sha256(4), sha384(5), - * sha512(6), (255) - * } HashAlgorithm; - * - * enum { anonymous(0), rsa(1), dsa(2), ecdsa(3), (255) } - * SignatureAlgorithm; - * - * struct { - * HashAlgorithm hash; - * SignatureAlgorithm signature; - * } SignatureAndHashAlgorithm; - * - * SignatureAndHashAlgorithm - * supported_signature_algorithms<2..2^16-2>; - */ - *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_SIG_ALG >> 8 ) & 0xFF ); - *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_SIG_ALG ) & 0xFF ); - - *p++ = (unsigned char)( ( ( sig_alg_len + 2 ) >> 8 ) & 0xFF ); - *p++ = (unsigned char)( ( ( sig_alg_len + 2 ) ) & 0xFF ); - - *p++ = (unsigned char)( ( sig_alg_len >> 8 ) & 0xFF ); - *p++ = (unsigned char)( ( sig_alg_len ) & 0xFF ); - - *olen = 6 + sig_alg_len; -} -#endif /* MBEDTLS_SSL_PROTO_TLS1_2 && - MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED */ - -#if defined(MBEDTLS_ECDH_C) || defined(MBEDTLS_ECDSA_C) || \ - defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED) -static void ssl_write_supported_elliptic_curves_ext( mbedtls_ssl_context *ssl, - unsigned char *buf, - size_t *olen ) -{ - unsigned char *p = buf; - const unsigned char *end = ssl->out_msg + MBEDTLS_SSL_OUT_CONTENT_LEN; - unsigned char *elliptic_curve_list = p + 6; - size_t elliptic_curve_len = 0; - const mbedtls_ecp_curve_info *info; -#if defined(MBEDTLS_ECP_C) - const mbedtls_ecp_group_id *grp_id; -#else - ((void) ssl); -#endif - - *olen = 0; - - MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello, adding supported_elliptic_curves extension" ) ); - -#if defined(MBEDTLS_ECP_C) - for( grp_id = ssl->conf->curve_list; *grp_id != MBEDTLS_ECP_DP_NONE; grp_id++ ) -#else - for( info = mbedtls_ecp_curve_list(); info->grp_id != MBEDTLS_ECP_DP_NONE; info++ ) -#endif - { -#if defined(MBEDTLS_ECP_C) - info = mbedtls_ecp_curve_info_from_grp_id( *grp_id ); -#endif - if( info == NULL ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "invalid curve in ssl configuration" ) ); - return; - } - - elliptic_curve_len += 2; - } - - if( end < p || (size_t)( end - p ) < 6 + elliptic_curve_len ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "buffer too small" ) ); - return; - } - - elliptic_curve_len = 0; - -#if defined(MBEDTLS_ECP_C) - for( grp_id = ssl->conf->curve_list; *grp_id != MBEDTLS_ECP_DP_NONE; grp_id++ ) -#else - for( info = mbedtls_ecp_curve_list(); info->grp_id != MBEDTLS_ECP_DP_NONE; info++ ) -#endif - { -#if defined(MBEDTLS_ECP_C) - info = mbedtls_ecp_curve_info_from_grp_id( *grp_id ); -#endif - elliptic_curve_list[elliptic_curve_len++] = info->tls_id >> 8; - elliptic_curve_list[elliptic_curve_len++] = info->tls_id & 0xFF; - } - - if( elliptic_curve_len == 0 ) - return; - - *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_SUPPORTED_ELLIPTIC_CURVES >> 8 ) & 0xFF ); - *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_SUPPORTED_ELLIPTIC_CURVES ) & 0xFF ); - - *p++ = (unsigned char)( ( ( elliptic_curve_len + 2 ) >> 8 ) & 0xFF ); - *p++ = (unsigned char)( ( ( elliptic_curve_len + 2 ) ) & 0xFF ); - - *p++ = (unsigned char)( ( ( elliptic_curve_len ) >> 8 ) & 0xFF ); - *p++ = (unsigned char)( ( ( elliptic_curve_len ) ) & 0xFF ); - - *olen = 6 + elliptic_curve_len; -} - -static void ssl_write_supported_point_formats_ext( mbedtls_ssl_context *ssl, - unsigned char *buf, - size_t *olen ) -{ - unsigned char *p = buf; - const unsigned char *end = ssl->out_msg + MBEDTLS_SSL_OUT_CONTENT_LEN; - - *olen = 0; - - MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello, adding supported_point_formats extension" ) ); - - if( end < p || (size_t)( end - p ) < 6 ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "buffer too small" ) ); - return; - } - - *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_SUPPORTED_POINT_FORMATS >> 8 ) & 0xFF ); - *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_SUPPORTED_POINT_FORMATS ) & 0xFF ); - - *p++ = 0x00; - *p++ = 2; - - *p++ = 1; - *p++ = MBEDTLS_ECP_PF_UNCOMPRESSED; - - *olen = 6; -} -#endif /* MBEDTLS_ECDH_C || MBEDTLS_ECDSA_C || - MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED */ - -#if defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED) -static void ssl_write_ecjpake_kkpp_ext( mbedtls_ssl_context *ssl, - unsigned char *buf, - size_t *olen ) -{ - int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; - unsigned char *p = buf; - const unsigned char *end = ssl->out_msg + MBEDTLS_SSL_OUT_CONTENT_LEN; - size_t kkpp_len; - - *olen = 0; - - /* Skip costly extension if we can't use EC J-PAKE anyway */ - if( mbedtls_ecjpake_check( &ssl->handshake->ecjpake_ctx ) != 0 ) - return; - - MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello, adding ecjpake_kkpp extension" ) ); - - if( end - p < 4 ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "buffer too small" ) ); - return; - } - - *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_ECJPAKE_KKPP >> 8 ) & 0xFF ); - *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_ECJPAKE_KKPP ) & 0xFF ); - - /* - * We may need to send ClientHello multiple times for Hello verification. - * We don't want to compute fresh values every time (both for performance - * and consistency reasons), so cache the extension content. - */ - if( ssl->handshake->ecjpake_cache == NULL || - ssl->handshake->ecjpake_cache_len == 0 ) - { - MBEDTLS_SSL_DEBUG_MSG( 3, ( "generating new ecjpake parameters" ) ); - - ret = mbedtls_ecjpake_write_round_one( &ssl->handshake->ecjpake_ctx, - p + 2, end - p - 2, &kkpp_len, - ssl->conf->f_rng, ssl->conf->p_rng ); - if( ret != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1 , "mbedtls_ecjpake_write_round_one", ret ); - return; - } - - ssl->handshake->ecjpake_cache = mbedtls_calloc( 1, kkpp_len ); - if( ssl->handshake->ecjpake_cache == NULL ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "allocation failed" ) ); - return; - } - - memcpy( ssl->handshake->ecjpake_cache, p + 2, kkpp_len ); - ssl->handshake->ecjpake_cache_len = kkpp_len; - } - else - { - MBEDTLS_SSL_DEBUG_MSG( 3, ( "re-using cached ecjpake parameters" ) ); - - kkpp_len = ssl->handshake->ecjpake_cache_len; - - if( (size_t)( end - p - 2 ) < kkpp_len ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "buffer too small" ) ); - return; - } - - memcpy( p + 2, ssl->handshake->ecjpake_cache, kkpp_len ); - } - - *p++ = (unsigned char)( ( kkpp_len >> 8 ) & 0xFF ); - *p++ = (unsigned char)( ( kkpp_len ) & 0xFF ); - - *olen = kkpp_len + 4; -} -#endif /* MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED */ - -#if defined(MBEDTLS_SSL_DTLS_CONNECTION_ID) -static void ssl_write_cid_ext( mbedtls_ssl_context *ssl, - unsigned char *buf, - size_t *olen ) -{ - unsigned char *p = buf; - size_t ext_len; - const unsigned char *end = ssl->out_msg + MBEDTLS_SSL_OUT_CONTENT_LEN; - - /* - * Quoting draft-ietf-tls-dtls-connection-id-05 - * https://tools.ietf.org/html/draft-ietf-tls-dtls-connection-id-05 - * - * struct { - * opaque cid<0..2^8-1>; - * } ConnectionId; - */ - - *olen = 0; - if( ssl->conf->transport != MBEDTLS_SSL_TRANSPORT_DATAGRAM || - ssl->negotiate_cid == MBEDTLS_SSL_CID_DISABLED ) - { - return; - } - MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello, adding CID extension" ) ); - - /* ssl->own_cid_len is at most MBEDTLS_SSL_CID_IN_LEN_MAX - * which is at most 255, so the increment cannot overflow. */ - if( end < p || (size_t)( end - p ) < (unsigned)( ssl->own_cid_len + 5 ) ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "buffer too small" ) ); - return; - } - - /* Add extension ID + size */ - *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_CID >> 8 ) & 0xFF ); - *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_CID ) & 0xFF ); - ext_len = (size_t) ssl->own_cid_len + 1; - *p++ = (unsigned char)( ( ext_len >> 8 ) & 0xFF ); - *p++ = (unsigned char)( ( ext_len ) & 0xFF ); - - *p++ = (uint8_t) ssl->own_cid_len; - memcpy( p, ssl->own_cid, ssl->own_cid_len ); - - *olen = ssl->own_cid_len + 5; -} -#endif /* MBEDTLS_SSL_DTLS_CONNECTION_ID */ - -#if defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH) -static void ssl_write_max_fragment_length_ext( mbedtls_ssl_context *ssl, - unsigned char *buf, - size_t *olen ) -{ - unsigned char *p = buf; - const unsigned char *end = ssl->out_msg + MBEDTLS_SSL_OUT_CONTENT_LEN; - - *olen = 0; - - if( ssl->conf->mfl_code == MBEDTLS_SSL_MAX_FRAG_LEN_NONE ) { - return; - } - - MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello, adding max_fragment_length extension" ) ); - - if( end < p || (size_t)( end - p ) < 5 ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "buffer too small" ) ); - return; - } - - *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_MAX_FRAGMENT_LENGTH >> 8 ) & 0xFF ); - *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_MAX_FRAGMENT_LENGTH ) & 0xFF ); - - *p++ = 0x00; - *p++ = 1; - - *p++ = ssl->conf->mfl_code; - - *olen = 5; -} -#endif /* MBEDTLS_SSL_MAX_FRAGMENT_LENGTH */ - -#if defined(MBEDTLS_SSL_TRUNCATED_HMAC) -static void ssl_write_truncated_hmac_ext( mbedtls_ssl_context *ssl, - unsigned char *buf, size_t *olen ) -{ - unsigned char *p = buf; - const unsigned char *end = ssl->out_msg + MBEDTLS_SSL_OUT_CONTENT_LEN; - - *olen = 0; - - if( ssl->conf->trunc_hmac == MBEDTLS_SSL_TRUNC_HMAC_DISABLED ) - { - return; - } - - MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello, adding truncated_hmac extension" ) ); - - if( end < p || (size_t)( end - p ) < 4 ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "buffer too small" ) ); - return; - } - - *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_TRUNCATED_HMAC >> 8 ) & 0xFF ); - *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_TRUNCATED_HMAC ) & 0xFF ); - - *p++ = 0x00; - *p++ = 0x00; - - *olen = 4; -} -#endif /* MBEDTLS_SSL_TRUNCATED_HMAC */ - -#if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC) -static void ssl_write_encrypt_then_mac_ext( mbedtls_ssl_context *ssl, - unsigned char *buf, size_t *olen ) -{ - unsigned char *p = buf; - const unsigned char *end = ssl->out_msg + MBEDTLS_SSL_OUT_CONTENT_LEN; - - *olen = 0; - - if( ssl->conf->encrypt_then_mac == MBEDTLS_SSL_ETM_DISABLED || - ssl->conf->max_minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 ) - { - return; - } - - MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello, adding encrypt_then_mac " - "extension" ) ); - - if( end < p || (size_t)( end - p ) < 4 ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "buffer too small" ) ); - return; - } - - *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_ENCRYPT_THEN_MAC >> 8 ) & 0xFF ); - *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_ENCRYPT_THEN_MAC ) & 0xFF ); - - *p++ = 0x00; - *p++ = 0x00; - - *olen = 4; -} -#endif /* MBEDTLS_SSL_ENCRYPT_THEN_MAC */ - -#if defined(MBEDTLS_SSL_EXTENDED_MASTER_SECRET) -static void ssl_write_extended_ms_ext( mbedtls_ssl_context *ssl, - unsigned char *buf, size_t *olen ) -{ - unsigned char *p = buf; - const unsigned char *end = ssl->out_msg + MBEDTLS_SSL_OUT_CONTENT_LEN; - - *olen = 0; - - if( ssl->conf->extended_ms == MBEDTLS_SSL_EXTENDED_MS_DISABLED || - ssl->conf->max_minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 ) - { - return; - } - - MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello, adding extended_master_secret " - "extension" ) ); - - if( end < p || (size_t)( end - p ) < 4 ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "buffer too small" ) ); - return; - } - - *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_EXTENDED_MASTER_SECRET >> 8 ) & 0xFF ); - *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_EXTENDED_MASTER_SECRET ) & 0xFF ); - - *p++ = 0x00; - *p++ = 0x00; - - *olen = 4; -} -#endif /* MBEDTLS_SSL_EXTENDED_MASTER_SECRET */ - -#if defined(MBEDTLS_SSL_SESSION_TICKETS) -static void ssl_write_session_ticket_ext( mbedtls_ssl_context *ssl, - unsigned char *buf, size_t *olen ) -{ - unsigned char *p = buf; - const unsigned char *end = ssl->out_msg + MBEDTLS_SSL_OUT_CONTENT_LEN; - size_t tlen = ssl->session_negotiate->ticket_len; - - *olen = 0; - - if( ssl->conf->session_tickets == MBEDTLS_SSL_SESSION_TICKETS_DISABLED ) - { - return; - } - - MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello, adding session ticket extension" ) ); - - if( end < p || (size_t)( end - p ) < 4 + tlen ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "buffer too small" ) ); - return; - } - - *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_SESSION_TICKET >> 8 ) & 0xFF ); - *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_SESSION_TICKET ) & 0xFF ); - - *p++ = (unsigned char)( ( tlen >> 8 ) & 0xFF ); - *p++ = (unsigned char)( ( tlen ) & 0xFF ); - - *olen = 4; - - if( ssl->session_negotiate->ticket == NULL || tlen == 0 ) - { - return; - } - - MBEDTLS_SSL_DEBUG_MSG( 3, ( "sending session ticket of length %d", tlen ) ); - - memcpy( p, ssl->session_negotiate->ticket, tlen ); - - *olen += tlen; -} -#endif /* MBEDTLS_SSL_SESSION_TICKETS */ - -#if defined(MBEDTLS_SSL_ALPN) -static void ssl_write_alpn_ext( mbedtls_ssl_context *ssl, - unsigned char *buf, size_t *olen ) -{ - unsigned char *p = buf; - const unsigned char *end = ssl->out_msg + MBEDTLS_SSL_OUT_CONTENT_LEN; - size_t alpnlen = 0; - const char **cur; - - *olen = 0; - - if( ssl->conf->alpn_list == NULL ) - { - return; - } - - MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello, adding alpn extension" ) ); - - for( cur = ssl->conf->alpn_list; *cur != NULL; cur++ ) - alpnlen += (unsigned char)( strlen( *cur ) & 0xFF ) + 1; - - if( end < p || (size_t)( end - p ) < 6 + alpnlen ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "buffer too small" ) ); - return; - } - - *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_ALPN >> 8 ) & 0xFF ); - *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_ALPN ) & 0xFF ); - - /* - * opaque ProtocolName<1..2^8-1>; - * - * struct { - * ProtocolName protocol_name_list<2..2^16-1> - * } ProtocolNameList; - */ - - /* Skip writing extension and list length for now */ - p += 4; - - for( cur = ssl->conf->alpn_list; *cur != NULL; cur++ ) - { - *p = (unsigned char)( strlen( *cur ) & 0xFF ); - memcpy( p + 1, *cur, *p ); - p += 1 + *p; - } - - *olen = p - buf; - - /* List length = olen - 2 (ext_type) - 2 (ext_len) - 2 (list_len) */ - buf[4] = (unsigned char)( ( ( *olen - 6 ) >> 8 ) & 0xFF ); - buf[5] = (unsigned char)( ( ( *olen - 6 ) ) & 0xFF ); - - /* Extension length = olen - 2 (ext_type) - 2 (ext_len) */ - buf[2] = (unsigned char)( ( ( *olen - 4 ) >> 8 ) & 0xFF ); - buf[3] = (unsigned char)( ( ( *olen - 4 ) ) & 0xFF ); -} -#endif /* MBEDTLS_SSL_ALPN */ - -/* - * Generate random bytes for ClientHello - */ -static int ssl_generate_random( mbedtls_ssl_context *ssl ) -{ - int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; - unsigned char *p = ssl->handshake->randbytes; -#if defined(MBEDTLS_HAVE_TIME) - mbedtls_time_t t; -#endif - - /* - * When responding to a verify request, MUST reuse random (RFC 6347 4.2.1) - */ -#if defined(MBEDTLS_SSL_PROTO_DTLS) - if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM && - ssl->handshake->verify_cookie != NULL ) - { - return( 0 ); - } -#endif - -#if defined(MBEDTLS_HAVE_TIME) - t = mbedtls_time( NULL ); - *p++ = (unsigned char)( t >> 24 ); - *p++ = (unsigned char)( t >> 16 ); - *p++ = (unsigned char)( t >> 8 ); - *p++ = (unsigned char)( t ); - - MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello, current time: %lu", t ) ); -#else - if( ( ret = ssl->conf->f_rng( ssl->conf->p_rng, p, 4 ) ) != 0 ) - return( ret ); - - p += 4; -#endif /* MBEDTLS_HAVE_TIME */ - - if( ( ret = ssl->conf->f_rng( ssl->conf->p_rng, p, 28 ) ) != 0 ) - return( ret ); - - return( 0 ); -} - -/** - * \brief Validate cipher suite against config in SSL context. - * - * \param suite_info cipher suite to validate - * \param ssl SSL context - * \param min_minor_ver Minimal minor version to accept a cipher suite - * \param max_minor_ver Maximal minor version to accept a cipher suite - * - * \return 0 if valid, else 1 - */ -static int ssl_validate_ciphersuite( const mbedtls_ssl_ciphersuite_t * suite_info, - const mbedtls_ssl_context * ssl, - int min_minor_ver, int max_minor_ver ) -{ - (void) ssl; - if( suite_info == NULL ) - return( 1 ); - - if( suite_info->min_minor_ver > max_minor_ver || - suite_info->max_minor_ver < min_minor_ver ) - return( 1 ); - -#if defined(MBEDTLS_SSL_PROTO_DTLS) - if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM && - ( suite_info->flags & MBEDTLS_CIPHERSUITE_NODTLS ) ) - return( 1 ); -#endif - -#if defined(MBEDTLS_ARC4_C) - if( ssl->conf->arc4_disabled == MBEDTLS_SSL_ARC4_DISABLED && - suite_info->cipher == MBEDTLS_CIPHER_ARC4_128 ) - return( 1 ); -#endif - -#if defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED) - if( suite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECJPAKE && - mbedtls_ecjpake_check( &ssl->handshake->ecjpake_ctx ) != 0 ) - return( 1 ); -#endif - - /* Don't suggest PSK-based ciphersuite if no PSK is available. */ -#if defined(MBEDTLS_KEY_EXCHANGE__SOME__PSK_ENABLED) - if( mbedtls_ssl_ciphersuite_uses_psk( suite_info ) && - ssl_conf_has_static_psk( ssl->conf ) == 0 ) - { - return( 1 ); - } -#endif /* MBEDTLS_KEY_EXCHANGE__SOME__PSK_ENABLED */ - - return( 0 ); -} - -static int ssl_write_client_hello( mbedtls_ssl_context *ssl ) -{ - int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; - size_t i, n, olen, ext_len = 0; - unsigned char *buf; - unsigned char *p, *q; - unsigned char offer_compress; - const int *ciphersuites; - const mbedtls_ssl_ciphersuite_t *ciphersuite_info; -#if defined(MBEDTLS_ECDH_C) || defined(MBEDTLS_ECDSA_C) || \ - defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED) - int uses_ec = 0; -#endif - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> write client hello" ) ); - - if( ssl->conf->f_rng == NULL ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "no RNG provided") ); - return( MBEDTLS_ERR_SSL_NO_RNG ); - } - -#if defined(MBEDTLS_SSL_RENEGOTIATION) - if( ssl->renego_status == MBEDTLS_SSL_INITIAL_HANDSHAKE ) -#endif - { - ssl->major_ver = ssl->conf->min_major_ver; - ssl->minor_ver = ssl->conf->min_minor_ver; - } - - if( ssl->conf->max_major_ver == 0 ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "configured max major version is invalid, " - "consider using mbedtls_ssl_config_defaults()" ) ); - return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); - } - - /* - * 0 . 0 handshake type - * 1 . 3 handshake length - * 4 . 5 highest version supported - * 6 . 9 current UNIX time - * 10 . 37 random bytes - */ - buf = ssl->out_msg; - p = buf + 4; - - mbedtls_ssl_write_version( ssl->conf->max_major_ver, ssl->conf->max_minor_ver, - ssl->conf->transport, p ); - p += 2; - - MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello, max version: [%d:%d]", - buf[4], buf[5] ) ); - - if( ( ret = ssl_generate_random( ssl ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "ssl_generate_random", ret ); - return( ret ); - } - - memcpy( p, ssl->handshake->randbytes, 32 ); - MBEDTLS_SSL_DEBUG_BUF( 3, "client hello, random bytes", p, 32 ); - p += 32; - - /* - * 38 . 38 session id length - * 39 . 39+n session id - * 39+n . 39+n DTLS only: cookie length (1 byte) - * 40+n . .. DTSL only: cookie - * .. . .. ciphersuitelist length (2 bytes) - * .. . .. ciphersuitelist - * .. . .. compression methods length (1 byte) - * .. . .. compression methods - * .. . .. extensions length (2 bytes) - * .. . .. extensions - */ - n = ssl->session_negotiate->id_len; - - if( n < 16 || n > 32 || -#if defined(MBEDTLS_SSL_RENEGOTIATION) - ssl->renego_status != MBEDTLS_SSL_INITIAL_HANDSHAKE || -#endif - ssl->handshake->resume == 0 ) - { - n = 0; - } - -#if defined(MBEDTLS_SSL_SESSION_TICKETS) - /* - * RFC 5077 section 3.4: "When presenting a ticket, the client MAY - * generate and include a Session ID in the TLS ClientHello." - */ -#if defined(MBEDTLS_SSL_RENEGOTIATION) - if( ssl->renego_status == MBEDTLS_SSL_INITIAL_HANDSHAKE ) -#endif - { - if( ssl->session_negotiate->ticket != NULL && - ssl->session_negotiate->ticket_len != 0 ) - { - ret = ssl->conf->f_rng( ssl->conf->p_rng, ssl->session_negotiate->id, 32 ); - - if( ret != 0 ) - return( ret ); - - ssl->session_negotiate->id_len = n = 32; - } - } -#endif /* MBEDTLS_SSL_SESSION_TICKETS */ - - *p++ = (unsigned char) n; - - for( i = 0; i < n; i++ ) - *p++ = ssl->session_negotiate->id[i]; - - MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello, session id len.: %d", n ) ); - MBEDTLS_SSL_DEBUG_BUF( 3, "client hello, session id", buf + 39, n ); - - /* - * DTLS cookie - */ -#if defined(MBEDTLS_SSL_PROTO_DTLS) - if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM ) - { - if( ssl->handshake->verify_cookie == NULL ) - { - MBEDTLS_SSL_DEBUG_MSG( 3, ( "no verify cookie to send" ) ); - *p++ = 0; - } - else - { - MBEDTLS_SSL_DEBUG_BUF( 3, "client hello, cookie", - ssl->handshake->verify_cookie, - ssl->handshake->verify_cookie_len ); - - *p++ = ssl->handshake->verify_cookie_len; - memcpy( p, ssl->handshake->verify_cookie, - ssl->handshake->verify_cookie_len ); - p += ssl->handshake->verify_cookie_len; - } - } -#endif - - /* - * Ciphersuite list - */ - ciphersuites = ssl->conf->ciphersuite_list[ssl->minor_ver]; - - /* Skip writing ciphersuite length for now */ - n = 0; - q = p; - p += 2; - - for( i = 0; ciphersuites[i] != 0; i++ ) - { - ciphersuite_info = mbedtls_ssl_ciphersuite_from_id( ciphersuites[i] ); - - if( ssl_validate_ciphersuite( ciphersuite_info, ssl, - ssl->conf->min_minor_ver, - ssl->conf->max_minor_ver ) != 0 ) - continue; - - MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello, add ciphersuite: %04x", - ciphersuites[i] ) ); - -#if defined(MBEDTLS_ECDH_C) || defined(MBEDTLS_ECDSA_C) || \ - defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED) - uses_ec |= mbedtls_ssl_ciphersuite_uses_ec( ciphersuite_info ); -#endif - - n++; - *p++ = (unsigned char)( ciphersuites[i] >> 8 ); - *p++ = (unsigned char)( ciphersuites[i] ); - } - - MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello, got %d ciphersuites (excluding SCSVs)", n ) ); - - /* - * Add TLS_EMPTY_RENEGOTIATION_INFO_SCSV - */ -#if defined(MBEDTLS_SSL_RENEGOTIATION) - if( ssl->renego_status == MBEDTLS_SSL_INITIAL_HANDSHAKE ) -#endif - { - MBEDTLS_SSL_DEBUG_MSG( 3, ( "adding EMPTY_RENEGOTIATION_INFO_SCSV" ) ); - *p++ = (unsigned char)( MBEDTLS_SSL_EMPTY_RENEGOTIATION_INFO >> 8 ); - *p++ = (unsigned char)( MBEDTLS_SSL_EMPTY_RENEGOTIATION_INFO ); - n++; - } - - /* Some versions of OpenSSL don't handle it correctly if not at end */ -#if defined(MBEDTLS_SSL_FALLBACK_SCSV) - if( ssl->conf->fallback == MBEDTLS_SSL_IS_FALLBACK ) - { - MBEDTLS_SSL_DEBUG_MSG( 3, ( "adding FALLBACK_SCSV" ) ); - *p++ = (unsigned char)( MBEDTLS_SSL_FALLBACK_SCSV_VALUE >> 8 ); - *p++ = (unsigned char)( MBEDTLS_SSL_FALLBACK_SCSV_VALUE ); - n++; - } -#endif - - *q++ = (unsigned char)( n >> 7 ); - *q++ = (unsigned char)( n << 1 ); - -#if defined(MBEDTLS_ZLIB_SUPPORT) - offer_compress = 1; -#else - offer_compress = 0; -#endif - - /* - * We don't support compression with DTLS right now: if many records come - * in the same datagram, uncompressing one could overwrite the next one. - * We don't want to add complexity for handling that case unless there is - * an actual need for it. - */ -#if defined(MBEDTLS_SSL_PROTO_DTLS) - if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM ) - offer_compress = 0; -#endif - - if( offer_compress ) - { - MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello, compress len.: %d", 2 ) ); - MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello, compress alg.: %d %d", - MBEDTLS_SSL_COMPRESS_DEFLATE, MBEDTLS_SSL_COMPRESS_NULL ) ); - - *p++ = 2; - *p++ = MBEDTLS_SSL_COMPRESS_DEFLATE; - *p++ = MBEDTLS_SSL_COMPRESS_NULL; - } - else - { - MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello, compress len.: %d", 1 ) ); - MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello, compress alg.: %d", - MBEDTLS_SSL_COMPRESS_NULL ) ); - - *p++ = 1; - *p++ = MBEDTLS_SSL_COMPRESS_NULL; - } - - // First write extensions, then the total length - // -#if defined(MBEDTLS_SSL_SERVER_NAME_INDICATION) - ssl_write_hostname_ext( ssl, p + 2 + ext_len, &olen ); - ext_len += olen; -#endif - - /* Note that TLS_EMPTY_RENEGOTIATION_INFO_SCSV is always added - * even if MBEDTLS_SSL_RENEGOTIATION is not defined. */ -#if defined(MBEDTLS_SSL_RENEGOTIATION) - ssl_write_renegotiation_ext( ssl, p + 2 + ext_len, &olen ); - ext_len += olen; -#endif - -#if defined(MBEDTLS_SSL_PROTO_TLS1_2) && \ - defined(MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED) - ssl_write_signature_algorithms_ext( ssl, p + 2 + ext_len, &olen ); - ext_len += olen; -#endif - -#if defined(MBEDTLS_ECDH_C) || defined(MBEDTLS_ECDSA_C) || \ - defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED) - if( uses_ec ) - { - ssl_write_supported_elliptic_curves_ext( ssl, p + 2 + ext_len, &olen ); - ext_len += olen; - - ssl_write_supported_point_formats_ext( ssl, p + 2 + ext_len, &olen ); - ext_len += olen; - } -#endif - -#if defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED) - ssl_write_ecjpake_kkpp_ext( ssl, p + 2 + ext_len, &olen ); - ext_len += olen; -#endif - -#if defined(MBEDTLS_SSL_DTLS_CONNECTION_ID) - ssl_write_cid_ext( ssl, p + 2 + ext_len, &olen ); - ext_len += olen; -#endif /* MBEDTLS_SSL_DTLS_CONNECTION_ID */ - -#if defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH) - ssl_write_max_fragment_length_ext( ssl, p + 2 + ext_len, &olen ); - ext_len += olen; -#endif - -#if defined(MBEDTLS_SSL_TRUNCATED_HMAC) - ssl_write_truncated_hmac_ext( ssl, p + 2 + ext_len, &olen ); - ext_len += olen; -#endif - -#if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC) - ssl_write_encrypt_then_mac_ext( ssl, p + 2 + ext_len, &olen ); - ext_len += olen; -#endif - -#if defined(MBEDTLS_SSL_EXTENDED_MASTER_SECRET) - ssl_write_extended_ms_ext( ssl, p + 2 + ext_len, &olen ); - ext_len += olen; -#endif - -#if defined(MBEDTLS_SSL_ALPN) - ssl_write_alpn_ext( ssl, p + 2 + ext_len, &olen ); - ext_len += olen; -#endif - -#if defined(MBEDTLS_SSL_SESSION_TICKETS) - ssl_write_session_ticket_ext( ssl, p + 2 + ext_len, &olen ); - ext_len += olen; -#endif - - /* olen unused if all extensions are disabled */ - ((void) olen); - - MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello, total extension length: %d", - ext_len ) ); - - if( ext_len > 0 ) - { - *p++ = (unsigned char)( ( ext_len >> 8 ) & 0xFF ); - *p++ = (unsigned char)( ( ext_len ) & 0xFF ); - p += ext_len; - } - - ssl->out_msglen = p - buf; - ssl->out_msgtype = MBEDTLS_SSL_MSG_HANDSHAKE; - ssl->out_msg[0] = MBEDTLS_SSL_HS_CLIENT_HELLO; - - ssl->state++; - -#if defined(MBEDTLS_SSL_PROTO_DTLS) - if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM ) - mbedtls_ssl_send_flight_completed( ssl ); -#endif - - if( ( ret = mbedtls_ssl_write_handshake_msg( ssl ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_write_handshake_msg", ret ); - return( ret ); - } - -#if defined(MBEDTLS_SSL_PROTO_DTLS) - if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM && - ( ret = mbedtls_ssl_flight_transmit( ssl ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_flight_transmit", ret ); - return( ret ); - } -#endif /* MBEDTLS_SSL_PROTO_DTLS */ - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= write client hello" ) ); - - return( 0 ); -} - -static int ssl_parse_renegotiation_info( mbedtls_ssl_context *ssl, - const unsigned char *buf, - size_t len ) -{ -#if defined(MBEDTLS_SSL_RENEGOTIATION) - if( ssl->renego_status != MBEDTLS_SSL_INITIAL_HANDSHAKE ) - { - /* Check verify-data in constant-time. The length OTOH is no secret */ - if( len != 1 + ssl->verify_data_len * 2 || - buf[0] != ssl->verify_data_len * 2 || - mbedtls_ssl_safer_memcmp( buf + 1, - ssl->own_verify_data, ssl->verify_data_len ) != 0 || - mbedtls_ssl_safer_memcmp( buf + 1 + ssl->verify_data_len, - ssl->peer_verify_data, ssl->verify_data_len ) != 0 ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "non-matching renegotiation info" ) ); - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE ); - return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO ); - } - } - else -#endif /* MBEDTLS_SSL_RENEGOTIATION */ - { - if( len != 1 || buf[0] != 0x00 ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "non-zero length renegotiation info" ) ); - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE ); - return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO ); - } - - ssl->secure_renegotiation = MBEDTLS_SSL_SECURE_RENEGOTIATION; - } - - return( 0 ); -} - -#if defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH) -static int ssl_parse_max_fragment_length_ext( mbedtls_ssl_context *ssl, - const unsigned char *buf, - size_t len ) -{ - /* - * server should use the extension only if we did, - * and if so the server's value should match ours (and len is always 1) - */ - if( ssl->conf->mfl_code == MBEDTLS_SSL_MAX_FRAG_LEN_NONE || - len != 1 || - buf[0] != ssl->conf->mfl_code ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "non-matching max fragment length extension" ) ); - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE ); - return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO ); - } - - return( 0 ); -} -#endif /* MBEDTLS_SSL_MAX_FRAGMENT_LENGTH */ - -#if defined(MBEDTLS_SSL_TRUNCATED_HMAC) -static int ssl_parse_truncated_hmac_ext( mbedtls_ssl_context *ssl, - const unsigned char *buf, - size_t len ) -{ - if( ssl->conf->trunc_hmac == MBEDTLS_SSL_TRUNC_HMAC_DISABLED || - len != 0 ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "non-matching truncated HMAC extension" ) ); - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE ); - return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO ); - } - - ((void) buf); - - ssl->session_negotiate->trunc_hmac = MBEDTLS_SSL_TRUNC_HMAC_ENABLED; - - return( 0 ); -} -#endif /* MBEDTLS_SSL_TRUNCATED_HMAC */ - -#if defined(MBEDTLS_SSL_DTLS_CONNECTION_ID) -static int ssl_parse_cid_ext( mbedtls_ssl_context *ssl, - const unsigned char *buf, - size_t len ) -{ - size_t peer_cid_len; - - if( /* CID extension only makes sense in DTLS */ - ssl->conf->transport != MBEDTLS_SSL_TRANSPORT_DATAGRAM || - /* The server must only send the CID extension if we have offered it. */ - ssl->negotiate_cid == MBEDTLS_SSL_CID_DISABLED ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "CID extension unexpected" ) ); - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE ); - return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO ); - } - - if( len == 0 ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "CID extension invalid" ) ); - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE ); - return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO ); - } - - peer_cid_len = *buf++; - len--; - - if( peer_cid_len > MBEDTLS_SSL_CID_OUT_LEN_MAX ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "CID extension invalid" ) ); - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE ); - return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO ); - } - - if( len != peer_cid_len ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "CID extension invalid" ) ); - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_ILLEGAL_PARAMETER ); - return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO ); - } - - ssl->handshake->cid_in_use = MBEDTLS_SSL_CID_ENABLED; - ssl->handshake->peer_cid_len = (uint8_t) peer_cid_len; - memcpy( ssl->handshake->peer_cid, buf, peer_cid_len ); - - MBEDTLS_SSL_DEBUG_MSG( 3, ( "Use of CID extension negotiated" ) ); - MBEDTLS_SSL_DEBUG_BUF( 3, "Server CID", buf, peer_cid_len ); - - return( 0 ); -} -#endif /* MBEDTLS_SSL_DTLS_CONNECTION_ID */ - -#if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC) -static int ssl_parse_encrypt_then_mac_ext( mbedtls_ssl_context *ssl, - const unsigned char *buf, - size_t len ) -{ - if( ssl->conf->encrypt_then_mac == MBEDTLS_SSL_ETM_DISABLED || - ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 || - len != 0 ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "non-matching encrypt-then-MAC extension" ) ); - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE ); - return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO ); - } - - ((void) buf); - - ssl->session_negotiate->encrypt_then_mac = MBEDTLS_SSL_ETM_ENABLED; - - return( 0 ); -} -#endif /* MBEDTLS_SSL_ENCRYPT_THEN_MAC */ - -#if defined(MBEDTLS_SSL_EXTENDED_MASTER_SECRET) -static int ssl_parse_extended_ms_ext( mbedtls_ssl_context *ssl, - const unsigned char *buf, - size_t len ) -{ - if( ssl->conf->extended_ms == MBEDTLS_SSL_EXTENDED_MS_DISABLED || - ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 || - len != 0 ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "non-matching extended master secret extension" ) ); - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE ); - return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO ); - } - - ((void) buf); - - ssl->handshake->extended_ms = MBEDTLS_SSL_EXTENDED_MS_ENABLED; - - return( 0 ); -} -#endif /* MBEDTLS_SSL_EXTENDED_MASTER_SECRET */ - -#if defined(MBEDTLS_SSL_SESSION_TICKETS) -static int ssl_parse_session_ticket_ext( mbedtls_ssl_context *ssl, - const unsigned char *buf, - size_t len ) -{ - if( ssl->conf->session_tickets == MBEDTLS_SSL_SESSION_TICKETS_DISABLED || - len != 0 ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "non-matching session ticket extension" ) ); - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE ); - return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO ); - } - - ((void) buf); - - ssl->handshake->new_session_ticket = 1; - - return( 0 ); -} -#endif /* MBEDTLS_SSL_SESSION_TICKETS */ - -#if defined(MBEDTLS_ECDH_C) || defined(MBEDTLS_ECDSA_C) || \ - defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED) -static int ssl_parse_supported_point_formats_ext( mbedtls_ssl_context *ssl, - const unsigned char *buf, - size_t len ) -{ - size_t list_size; - const unsigned char *p; - - if( len == 0 || (size_t)( buf[0] + 1 ) != len ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad server hello message" ) ); - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR ); - return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO ); - } - list_size = buf[0]; - - p = buf + 1; - while( list_size > 0 ) - { - if( p[0] == MBEDTLS_ECP_PF_UNCOMPRESSED || - p[0] == MBEDTLS_ECP_PF_COMPRESSED ) - { -#if defined(MBEDTLS_ECDH_C) || defined(MBEDTLS_ECDSA_C) - ssl->handshake->ecdh_ctx.point_format = p[0]; -#endif -#if defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED) - ssl->handshake->ecjpake_ctx.point_format = p[0]; -#endif - MBEDTLS_SSL_DEBUG_MSG( 4, ( "point format selected: %d", p[0] ) ); - return( 0 ); - } - - list_size--; - p++; - } - - MBEDTLS_SSL_DEBUG_MSG( 1, ( "no point format in common" ) ); - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE ); - return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO ); -} -#endif /* MBEDTLS_ECDH_C || MBEDTLS_ECDSA_C || - MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED */ - -#if defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED) -static int ssl_parse_ecjpake_kkpp( mbedtls_ssl_context *ssl, - const unsigned char *buf, - size_t len ) -{ - int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; - - if( ssl->handshake->ciphersuite_info->key_exchange != - MBEDTLS_KEY_EXCHANGE_ECJPAKE ) - { - MBEDTLS_SSL_DEBUG_MSG( 3, ( "skip ecjpake kkpp extension" ) ); - return( 0 ); - } - - /* If we got here, we no longer need our cached extension */ - mbedtls_free( ssl->handshake->ecjpake_cache ); - ssl->handshake->ecjpake_cache = NULL; - ssl->handshake->ecjpake_cache_len = 0; - - if( ( ret = mbedtls_ecjpake_read_round_one( &ssl->handshake->ecjpake_ctx, - buf, len ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ecjpake_read_round_one", ret ); - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE ); - return( ret ); - } - - return( 0 ); -} -#endif /* MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED */ - -#if defined(MBEDTLS_SSL_ALPN) -static int ssl_parse_alpn_ext( mbedtls_ssl_context *ssl, - const unsigned char *buf, size_t len ) -{ - size_t list_len, name_len; - const char **p; - - /* If we didn't send it, the server shouldn't send it */ - if( ssl->conf->alpn_list == NULL ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "non-matching ALPN extension" ) ); - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE ); - return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO ); - } - - /* - * opaque ProtocolName<1..2^8-1>; - * - * struct { - * ProtocolName protocol_name_list<2..2^16-1> - * } ProtocolNameList; - * - * the "ProtocolNameList" MUST contain exactly one "ProtocolName" - */ - - /* Min length is 2 (list_len) + 1 (name_len) + 1 (name) */ - if( len < 4 ) - { - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR ); - return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO ); - } - - list_len = ( buf[0] << 8 ) | buf[1]; - if( list_len != len - 2 ) - { - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR ); - return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO ); - } - - name_len = buf[2]; - if( name_len != list_len - 1 ) - { - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR ); - return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO ); - } - - /* Check that the server chosen protocol was in our list and save it */ - for( p = ssl->conf->alpn_list; *p != NULL; p++ ) - { - if( name_len == strlen( *p ) && - memcmp( buf + 3, *p, name_len ) == 0 ) - { - ssl->alpn_chosen = *p; - return( 0 ); - } - } - - MBEDTLS_SSL_DEBUG_MSG( 1, ( "ALPN extension: no matching protocol" ) ); - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE ); - return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO ); -} -#endif /* MBEDTLS_SSL_ALPN */ - -/* - * Parse HelloVerifyRequest. Only called after verifying the HS type. - */ -#if defined(MBEDTLS_SSL_PROTO_DTLS) -static int ssl_parse_hello_verify_request( mbedtls_ssl_context *ssl ) -{ - const unsigned char *p = ssl->in_msg + mbedtls_ssl_hs_hdr_len( ssl ); - int major_ver, minor_ver; - unsigned char cookie_len; - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> parse hello verify request" ) ); - - /* - * struct { - * ProtocolVersion server_version; - * opaque cookie<0..2^8-1>; - * } HelloVerifyRequest; - */ - MBEDTLS_SSL_DEBUG_BUF( 3, "server version", p, 2 ); - mbedtls_ssl_read_version( &major_ver, &minor_ver, ssl->conf->transport, p ); - p += 2; - - /* - * Since the RFC is not clear on this point, accept DTLS 1.0 (TLS 1.1) - * even is lower than our min version. - */ - if( major_ver < MBEDTLS_SSL_MAJOR_VERSION_3 || - minor_ver < MBEDTLS_SSL_MINOR_VERSION_2 || - major_ver > ssl->conf->max_major_ver || - minor_ver > ssl->conf->max_minor_ver ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad server version" ) ); - - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_PROTOCOL_VERSION ); - - return( MBEDTLS_ERR_SSL_BAD_HS_PROTOCOL_VERSION ); - } - - cookie_len = *p++; - MBEDTLS_SSL_DEBUG_BUF( 3, "cookie", p, cookie_len ); - - if( ( ssl->in_msg + ssl->in_msglen ) - p < cookie_len ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, - ( "cookie length does not match incoming message size" ) ); - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR ); - return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO ); - } - - mbedtls_free( ssl->handshake->verify_cookie ); - - ssl->handshake->verify_cookie = mbedtls_calloc( 1, cookie_len ); - if( ssl->handshake->verify_cookie == NULL ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "alloc failed (%d bytes)", cookie_len ) ); - return( MBEDTLS_ERR_SSL_ALLOC_FAILED ); - } - - memcpy( ssl->handshake->verify_cookie, p, cookie_len ); - ssl->handshake->verify_cookie_len = cookie_len; - - /* Start over at ClientHello */ - ssl->state = MBEDTLS_SSL_CLIENT_HELLO; - mbedtls_ssl_reset_checksum( ssl ); - - mbedtls_ssl_recv_flight_completed( ssl ); - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= parse hello verify request" ) ); - - return( 0 ); -} -#endif /* MBEDTLS_SSL_PROTO_DTLS */ - -static int ssl_parse_server_hello( mbedtls_ssl_context *ssl ) -{ - int ret, i; - size_t n; - size_t ext_len; - unsigned char *buf, *ext; - unsigned char comp; -#if defined(MBEDTLS_ZLIB_SUPPORT) - int accept_comp; -#endif -#if defined(MBEDTLS_SSL_RENEGOTIATION) - int renegotiation_info_seen = 0; -#endif - int handshake_failure = 0; - const mbedtls_ssl_ciphersuite_t *suite_info; - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> parse server hello" ) ); - - if( ( ret = mbedtls_ssl_read_record( ssl, 1 ) ) != 0 ) - { - /* No alert on a read error. */ - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_read_record", ret ); - return( ret ); - } - - buf = ssl->in_msg; - - if( ssl->in_msgtype != MBEDTLS_SSL_MSG_HANDSHAKE ) - { -#if defined(MBEDTLS_SSL_RENEGOTIATION) - if( ssl->renego_status == MBEDTLS_SSL_RENEGOTIATION_IN_PROGRESS ) - { - ssl->renego_records_seen++; - - if( ssl->conf->renego_max_records >= 0 && - ssl->renego_records_seen > ssl->conf->renego_max_records ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "renegotiation requested, " - "but not honored by server" ) ); - return( MBEDTLS_ERR_SSL_UNEXPECTED_MESSAGE ); - } - - MBEDTLS_SSL_DEBUG_MSG( 1, ( "non-handshake message during renego" ) ); - - ssl->keep_current_message = 1; - return( MBEDTLS_ERR_SSL_WAITING_SERVER_HELLO_RENEGO ); - } -#endif /* MBEDTLS_SSL_RENEGOTIATION */ - - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad server hello message" ) ); - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_UNEXPECTED_MESSAGE ); - return( MBEDTLS_ERR_SSL_UNEXPECTED_MESSAGE ); - } - -#if defined(MBEDTLS_SSL_PROTO_DTLS) - if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM ) - { - if( buf[0] == MBEDTLS_SSL_HS_HELLO_VERIFY_REQUEST ) - { - MBEDTLS_SSL_DEBUG_MSG( 2, ( "received hello verify request" ) ); - MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= parse server hello" ) ); - return( ssl_parse_hello_verify_request( ssl ) ); - } - else - { - /* We made it through the verification process */ - mbedtls_free( ssl->handshake->verify_cookie ); - ssl->handshake->verify_cookie = NULL; - ssl->handshake->verify_cookie_len = 0; - } - } -#endif /* MBEDTLS_SSL_PROTO_DTLS */ - - if( ssl->in_hslen < 38 + mbedtls_ssl_hs_hdr_len( ssl ) || - buf[0] != MBEDTLS_SSL_HS_SERVER_HELLO ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad server hello message" ) ); - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR ); - return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO ); - } - - /* - * 0 . 1 server_version - * 2 . 33 random (maybe including 4 bytes of Unix time) - * 34 . 34 session_id length = n - * 35 . 34+n session_id - * 35+n . 36+n cipher_suite - * 37+n . 37+n compression_method - * - * 38+n . 39+n extensions length (optional) - * 40+n . .. extensions - */ - buf += mbedtls_ssl_hs_hdr_len( ssl ); - - MBEDTLS_SSL_DEBUG_BUF( 3, "server hello, version", buf + 0, 2 ); - mbedtls_ssl_read_version( &ssl->major_ver, &ssl->minor_ver, - ssl->conf->transport, buf + 0 ); - - if( ssl->major_ver < ssl->conf->min_major_ver || - ssl->minor_ver < ssl->conf->min_minor_ver || - ssl->major_ver > ssl->conf->max_major_ver || - ssl->minor_ver > ssl->conf->max_minor_ver ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "server version out of bounds - " - " min: [%d:%d], server: [%d:%d], max: [%d:%d]", - ssl->conf->min_major_ver, ssl->conf->min_minor_ver, - ssl->major_ver, ssl->minor_ver, - ssl->conf->max_major_ver, ssl->conf->max_minor_ver ) ); - - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_PROTOCOL_VERSION ); - - return( MBEDTLS_ERR_SSL_BAD_HS_PROTOCOL_VERSION ); - } - - MBEDTLS_SSL_DEBUG_MSG( 3, ( "server hello, current time: %lu", - ( (uint32_t) buf[2] << 24 ) | - ( (uint32_t) buf[3] << 16 ) | - ( (uint32_t) buf[4] << 8 ) | - ( (uint32_t) buf[5] ) ) ); - - memcpy( ssl->handshake->randbytes + 32, buf + 2, 32 ); - - n = buf[34]; - - MBEDTLS_SSL_DEBUG_BUF( 3, "server hello, random bytes", buf + 2, 32 ); - - if( n > 32 ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad server hello message" ) ); - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR ); - return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO ); - } - - if( ssl->in_hslen > mbedtls_ssl_hs_hdr_len( ssl ) + 39 + n ) - { - ext_len = ( ( buf[38 + n] << 8 ) - | ( buf[39 + n] ) ); - - if( ( ext_len > 0 && ext_len < 4 ) || - ssl->in_hslen != mbedtls_ssl_hs_hdr_len( ssl ) + 40 + n + ext_len ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad server hello message" ) ); - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR ); - return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO ); - } - } - else if( ssl->in_hslen == mbedtls_ssl_hs_hdr_len( ssl ) + 38 + n ) - { - ext_len = 0; - } - else - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad server hello message" ) ); - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR ); - return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO ); - } - - /* ciphersuite (used later) */ - i = ( buf[35 + n] << 8 ) | buf[36 + n]; - - /* - * Read and check compression - */ - comp = buf[37 + n]; - -#if defined(MBEDTLS_ZLIB_SUPPORT) - /* See comments in ssl_write_client_hello() */ -#if defined(MBEDTLS_SSL_PROTO_DTLS) - if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM ) - accept_comp = 0; - else -#endif - accept_comp = 1; - - if( comp != MBEDTLS_SSL_COMPRESS_NULL && - ( comp != MBEDTLS_SSL_COMPRESS_DEFLATE || accept_comp == 0 ) ) -#else /* MBEDTLS_ZLIB_SUPPORT */ - if( comp != MBEDTLS_SSL_COMPRESS_NULL ) -#endif/* MBEDTLS_ZLIB_SUPPORT */ - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "server hello, bad compression: %d", comp ) ); - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_ILLEGAL_PARAMETER ); - return( MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE ); - } - - /* - * Initialize update checksum functions - */ - ssl->handshake->ciphersuite_info = mbedtls_ssl_ciphersuite_from_id( i ); - if( ssl->handshake->ciphersuite_info == NULL ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "ciphersuite info for %04x not found", i ) ); - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_INTERNAL_ERROR ); - return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); - } - - mbedtls_ssl_optimize_checksum( ssl, ssl->handshake->ciphersuite_info ); - - MBEDTLS_SSL_DEBUG_MSG( 3, ( "server hello, session id len.: %d", n ) ); - MBEDTLS_SSL_DEBUG_BUF( 3, "server hello, session id", buf + 35, n ); - - /* - * Check if the session can be resumed - */ - if( ssl->handshake->resume == 0 || n == 0 || -#if defined(MBEDTLS_SSL_RENEGOTIATION) - ssl->renego_status != MBEDTLS_SSL_INITIAL_HANDSHAKE || -#endif - ssl->session_negotiate->ciphersuite != i || - ssl->session_negotiate->compression != comp || - ssl->session_negotiate->id_len != n || - memcmp( ssl->session_negotiate->id, buf + 35, n ) != 0 ) - { - ssl->state++; - ssl->handshake->resume = 0; -#if defined(MBEDTLS_HAVE_TIME) - ssl->session_negotiate->start = mbedtls_time( NULL ); -#endif - ssl->session_negotiate->ciphersuite = i; - ssl->session_negotiate->compression = comp; - ssl->session_negotiate->id_len = n; - memcpy( ssl->session_negotiate->id, buf + 35, n ); - } - else - { - ssl->state = MBEDTLS_SSL_SERVER_CHANGE_CIPHER_SPEC; - - if( ( ret = mbedtls_ssl_derive_keys( ssl ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_derive_keys", ret ); - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_INTERNAL_ERROR ); - return( ret ); - } - } - - MBEDTLS_SSL_DEBUG_MSG( 3, ( "%s session has been resumed", - ssl->handshake->resume ? "a" : "no" ) ); - - MBEDTLS_SSL_DEBUG_MSG( 3, ( "server hello, chosen ciphersuite: %04x", i ) ); - MBEDTLS_SSL_DEBUG_MSG( 3, ( "server hello, compress alg.: %d", buf[37 + n] ) ); - - /* - * Perform cipher suite validation in same way as in ssl_write_client_hello. - */ - i = 0; - while( 1 ) - { - if( ssl->conf->ciphersuite_list[ssl->minor_ver][i] == 0 ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad server hello message" ) ); - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_ILLEGAL_PARAMETER ); - return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO ); - } - - if( ssl->conf->ciphersuite_list[ssl->minor_ver][i++] == - ssl->session_negotiate->ciphersuite ) - { - break; - } - } - - suite_info = mbedtls_ssl_ciphersuite_from_id( ssl->session_negotiate->ciphersuite ); - if( ssl_validate_ciphersuite( suite_info, ssl, ssl->minor_ver, ssl->minor_ver ) != 0 ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad server hello message" ) ); - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_ILLEGAL_PARAMETER ); - return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO ); - } - - MBEDTLS_SSL_DEBUG_MSG( 3, ( "server hello, chosen ciphersuite: %s", suite_info->name ) ); - -#if defined(MBEDTLS_SSL__ECP_RESTARTABLE) - if( suite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA && - ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_3 ) - { - ssl->handshake->ecrs_enabled = 1; - } -#endif - - if( comp != MBEDTLS_SSL_COMPRESS_NULL -#if defined(MBEDTLS_ZLIB_SUPPORT) - && comp != MBEDTLS_SSL_COMPRESS_DEFLATE -#endif - ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad server hello message" ) ); - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_ILLEGAL_PARAMETER ); - return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO ); - } - ssl->session_negotiate->compression = comp; - - ext = buf + 40 + n; - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "server hello, total extension length: %d", ext_len ) ); - - while( ext_len ) - { - unsigned int ext_id = ( ( ext[0] << 8 ) - | ( ext[1] ) ); - unsigned int ext_size = ( ( ext[2] << 8 ) - | ( ext[3] ) ); - - if( ext_size + 4 > ext_len ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad server hello message" ) ); - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR ); - return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO ); - } - - switch( ext_id ) - { - case MBEDTLS_TLS_EXT_RENEGOTIATION_INFO: - MBEDTLS_SSL_DEBUG_MSG( 3, ( "found renegotiation extension" ) ); -#if defined(MBEDTLS_SSL_RENEGOTIATION) - renegotiation_info_seen = 1; -#endif - - if( ( ret = ssl_parse_renegotiation_info( ssl, ext + 4, - ext_size ) ) != 0 ) - return( ret ); - - break; - -#if defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH) - case MBEDTLS_TLS_EXT_MAX_FRAGMENT_LENGTH: - MBEDTLS_SSL_DEBUG_MSG( 3, ( "found max_fragment_length extension" ) ); - - if( ( ret = ssl_parse_max_fragment_length_ext( ssl, - ext + 4, ext_size ) ) != 0 ) - { - return( ret ); - } - - break; -#endif /* MBEDTLS_SSL_MAX_FRAGMENT_LENGTH */ - -#if defined(MBEDTLS_SSL_TRUNCATED_HMAC) - case MBEDTLS_TLS_EXT_TRUNCATED_HMAC: - MBEDTLS_SSL_DEBUG_MSG( 3, ( "found truncated_hmac extension" ) ); - - if( ( ret = ssl_parse_truncated_hmac_ext( ssl, - ext + 4, ext_size ) ) != 0 ) - { - return( ret ); - } - - break; -#endif /* MBEDTLS_SSL_TRUNCATED_HMAC */ - -#if defined(MBEDTLS_SSL_DTLS_CONNECTION_ID) - case MBEDTLS_TLS_EXT_CID: - MBEDTLS_SSL_DEBUG_MSG( 3, ( "found CID extension" ) ); - - if( ( ret = ssl_parse_cid_ext( ssl, - ext + 4, - ext_size ) ) != 0 ) - { - return( ret ); - } - - break; -#endif /* MBEDTLS_SSL_DTLS_CONNECTION_ID */ - -#if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC) - case MBEDTLS_TLS_EXT_ENCRYPT_THEN_MAC: - MBEDTLS_SSL_DEBUG_MSG( 3, ( "found encrypt_then_mac extension" ) ); - - if( ( ret = ssl_parse_encrypt_then_mac_ext( ssl, - ext + 4, ext_size ) ) != 0 ) - { - return( ret ); - } - - break; -#endif /* MBEDTLS_SSL_ENCRYPT_THEN_MAC */ - -#if defined(MBEDTLS_SSL_EXTENDED_MASTER_SECRET) - case MBEDTLS_TLS_EXT_EXTENDED_MASTER_SECRET: - MBEDTLS_SSL_DEBUG_MSG( 3, ( "found extended_master_secret extension" ) ); - - if( ( ret = ssl_parse_extended_ms_ext( ssl, - ext + 4, ext_size ) ) != 0 ) - { - return( ret ); - } - - break; -#endif /* MBEDTLS_SSL_EXTENDED_MASTER_SECRET */ - -#if defined(MBEDTLS_SSL_SESSION_TICKETS) - case MBEDTLS_TLS_EXT_SESSION_TICKET: - MBEDTLS_SSL_DEBUG_MSG( 3, ( "found session_ticket extension" ) ); - - if( ( ret = ssl_parse_session_ticket_ext( ssl, - ext + 4, ext_size ) ) != 0 ) - { - return( ret ); - } - - break; -#endif /* MBEDTLS_SSL_SESSION_TICKETS */ - -#if defined(MBEDTLS_ECDH_C) || defined(MBEDTLS_ECDSA_C) || \ - defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED) - case MBEDTLS_TLS_EXT_SUPPORTED_POINT_FORMATS: - MBEDTLS_SSL_DEBUG_MSG( 3, ( "found supported_point_formats extension" ) ); - - if( ( ret = ssl_parse_supported_point_formats_ext( ssl, - ext + 4, ext_size ) ) != 0 ) - { - return( ret ); - } - - break; -#endif /* MBEDTLS_ECDH_C || MBEDTLS_ECDSA_C || - MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED */ - -#if defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED) - case MBEDTLS_TLS_EXT_ECJPAKE_KKPP: - MBEDTLS_SSL_DEBUG_MSG( 3, ( "found ecjpake_kkpp extension" ) ); - - if( ( ret = ssl_parse_ecjpake_kkpp( ssl, - ext + 4, ext_size ) ) != 0 ) - { - return( ret ); - } - - break; -#endif /* MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED */ - -#if defined(MBEDTLS_SSL_ALPN) - case MBEDTLS_TLS_EXT_ALPN: - MBEDTLS_SSL_DEBUG_MSG( 3, ( "found alpn extension" ) ); - - if( ( ret = ssl_parse_alpn_ext( ssl, ext + 4, ext_size ) ) != 0 ) - return( ret ); - - break; -#endif /* MBEDTLS_SSL_ALPN */ - - default: - MBEDTLS_SSL_DEBUG_MSG( 3, ( "unknown extension found: %d (ignoring)", - ext_id ) ); - } - - ext_len -= 4 + ext_size; - ext += 4 + ext_size; - - if( ext_len > 0 && ext_len < 4 ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad server hello message" ) ); - return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO ); - } - } - - /* - * Renegotiation security checks - */ - if( ssl->secure_renegotiation == MBEDTLS_SSL_LEGACY_RENEGOTIATION && - ssl->conf->allow_legacy_renegotiation == MBEDTLS_SSL_LEGACY_BREAK_HANDSHAKE ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "legacy renegotiation, breaking off handshake" ) ); - handshake_failure = 1; - } -#if defined(MBEDTLS_SSL_RENEGOTIATION) - else if( ssl->renego_status == MBEDTLS_SSL_RENEGOTIATION_IN_PROGRESS && - ssl->secure_renegotiation == MBEDTLS_SSL_SECURE_RENEGOTIATION && - renegotiation_info_seen == 0 ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "renegotiation_info extension missing (secure)" ) ); - handshake_failure = 1; - } - else if( ssl->renego_status == MBEDTLS_SSL_RENEGOTIATION_IN_PROGRESS && - ssl->secure_renegotiation == MBEDTLS_SSL_LEGACY_RENEGOTIATION && - ssl->conf->allow_legacy_renegotiation == MBEDTLS_SSL_LEGACY_NO_RENEGOTIATION ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "legacy renegotiation not allowed" ) ); - handshake_failure = 1; - } - else if( ssl->renego_status == MBEDTLS_SSL_RENEGOTIATION_IN_PROGRESS && - ssl->secure_renegotiation == MBEDTLS_SSL_LEGACY_RENEGOTIATION && - renegotiation_info_seen == 1 ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "renegotiation_info extension present (legacy)" ) ); - handshake_failure = 1; - } -#endif /* MBEDTLS_SSL_RENEGOTIATION */ - - if( handshake_failure == 1 ) - { - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE ); - return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO ); - } - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= parse server hello" ) ); - - return( 0 ); -} - -#if defined(MBEDTLS_KEY_EXCHANGE_DHE_RSA_ENABLED) || \ - defined(MBEDTLS_KEY_EXCHANGE_DHE_PSK_ENABLED) -static int ssl_parse_server_dh_params( mbedtls_ssl_context *ssl, unsigned char **p, - unsigned char *end ) -{ - int ret = MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE; - - /* - * Ephemeral DH parameters: - * - * struct { - * opaque dh_p<1..2^16-1>; - * opaque dh_g<1..2^16-1>; - * opaque dh_Ys<1..2^16-1>; - * } ServerDHParams; - */ - if( ( ret = mbedtls_dhm_read_params( &ssl->handshake->dhm_ctx, p, end ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 2, ( "mbedtls_dhm_read_params" ), ret ); - return( ret ); - } - - if( ssl->handshake->dhm_ctx.len * 8 < ssl->conf->dhm_min_bitlen ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "DHM prime too short: %d < %d", - ssl->handshake->dhm_ctx.len * 8, - ssl->conf->dhm_min_bitlen ) ); - return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_KEY_EXCHANGE ); - } - - MBEDTLS_SSL_DEBUG_MPI( 3, "DHM: P ", &ssl->handshake->dhm_ctx.P ); - MBEDTLS_SSL_DEBUG_MPI( 3, "DHM: G ", &ssl->handshake->dhm_ctx.G ); - MBEDTLS_SSL_DEBUG_MPI( 3, "DHM: GY", &ssl->handshake->dhm_ctx.GY ); - - return( ret ); -} -#endif /* MBEDTLS_KEY_EXCHANGE_DHE_RSA_ENABLED || - MBEDTLS_KEY_EXCHANGE_DHE_PSK_ENABLED */ - -#if defined(MBEDTLS_KEY_EXCHANGE_ECDHE_RSA_ENABLED) || \ - defined(MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED) || \ - defined(MBEDTLS_KEY_EXCHANGE_ECDHE_PSK_ENABLED) || \ - defined(MBEDTLS_KEY_EXCHANGE_ECDH_RSA_ENABLED) || \ - defined(MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA_ENABLED) -static int ssl_check_server_ecdh_params( const mbedtls_ssl_context *ssl ) -{ - const mbedtls_ecp_curve_info *curve_info; - mbedtls_ecp_group_id grp_id; -#if defined(MBEDTLS_ECDH_LEGACY_CONTEXT) - grp_id = ssl->handshake->ecdh_ctx.grp.id; -#else - grp_id = ssl->handshake->ecdh_ctx.grp_id; -#endif - - curve_info = mbedtls_ecp_curve_info_from_grp_id( grp_id ); - if( curve_info == NULL ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) ); - return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); - } - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "ECDH curve: %s", curve_info->name ) ); - -#if defined(MBEDTLS_ECP_C) - if( mbedtls_ssl_check_curve( ssl, grp_id ) != 0 ) -#else - if( ssl->handshake->ecdh_ctx.grp.nbits < 163 || - ssl->handshake->ecdh_ctx.grp.nbits > 521 ) -#endif - return( -1 ); - - MBEDTLS_SSL_DEBUG_ECDH( 3, &ssl->handshake->ecdh_ctx, - MBEDTLS_DEBUG_ECDH_QP ); - - return( 0 ); -} -#endif /* MBEDTLS_KEY_EXCHANGE_ECDHE_RSA_ENABLED || - MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED || - MBEDTLS_KEY_EXCHANGE_ECDHE_PSK_ENABLED || - MBEDTLS_KEY_EXCHANGE_ECDH_RSA_ENABLED || - MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA_ENABLED */ - -#if defined(MBEDTLS_USE_PSA_CRYPTO) && \ - ( defined(MBEDTLS_KEY_EXCHANGE_ECDHE_RSA_ENABLED) || \ - defined(MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED) ) -static int ssl_parse_server_ecdh_params_psa( mbedtls_ssl_context *ssl, - unsigned char **p, - unsigned char *end ) -{ - uint16_t tls_id; - size_t ecdh_bits = 0; - uint8_t ecpoint_len; - mbedtls_ssl_handshake_params *handshake = ssl->handshake; - - /* - * Parse ECC group - */ - - if( end - *p < 4 ) - return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_KEY_EXCHANGE ); - - /* First byte is curve_type; only named_curve is handled */ - if( *(*p)++ != MBEDTLS_ECP_TLS_NAMED_CURVE ) - return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_KEY_EXCHANGE ); - - /* Next two bytes are the namedcurve value */ - tls_id = *(*p)++; - tls_id <<= 8; - tls_id |= *(*p)++; - - /* Convert EC group to PSA key type. */ - if( ( handshake->ecdh_psa_type = - mbedtls_psa_parse_tls_ecc_group( tls_id, &ecdh_bits ) ) == 0 ) - { - return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_KEY_EXCHANGE ); - } - if( ecdh_bits > 0xffff ) - return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_KEY_EXCHANGE ); - handshake->ecdh_bits = (uint16_t) ecdh_bits; - - /* - * Put peer's ECDH public key in the format understood by PSA. - */ - - ecpoint_len = *(*p)++; - if( (size_t)( end - *p ) < ecpoint_len ) - return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_KEY_EXCHANGE ); - - if( mbedtls_psa_tls_ecpoint_to_psa_ec( - *p, ecpoint_len, - handshake->ecdh_psa_peerkey, - sizeof( handshake->ecdh_psa_peerkey ), - &handshake->ecdh_psa_peerkey_len ) != 0 ) - { - return( MBEDTLS_ERR_SSL_HW_ACCEL_FAILED ); - } - - *p += ecpoint_len; - return( 0 ); -} -#endif /* MBEDTLS_USE_PSA_CRYPTO && - ( MBEDTLS_KEY_EXCHANGE_ECDHE_RSA_ENABLED || - MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED ) */ - -#if defined(MBEDTLS_KEY_EXCHANGE_ECDHE_RSA_ENABLED) || \ - defined(MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED) || \ - defined(MBEDTLS_KEY_EXCHANGE_ECDHE_PSK_ENABLED) -static int ssl_parse_server_ecdh_params( mbedtls_ssl_context *ssl, - unsigned char **p, - unsigned char *end ) -{ - int ret = MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE; - - /* - * Ephemeral ECDH parameters: - * - * struct { - * ECParameters curve_params; - * ECPoint public; - * } ServerECDHParams; - */ - if( ( ret = mbedtls_ecdh_read_params( &ssl->handshake->ecdh_ctx, - (const unsigned char **) p, end ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, ( "mbedtls_ecdh_read_params" ), ret ); -#if defined(MBEDTLS_SSL__ECP_RESTARTABLE) - if( ret == MBEDTLS_ERR_ECP_IN_PROGRESS ) - ret = MBEDTLS_ERR_SSL_CRYPTO_IN_PROGRESS; -#endif - return( ret ); - } - - if( ssl_check_server_ecdh_params( ssl ) != 0 ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad server key exchange message (ECDHE curve)" ) ); - return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_KEY_EXCHANGE ); - } - - return( ret ); -} -#endif /* MBEDTLS_KEY_EXCHANGE_ECDHE_RSA_ENABLED || - MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED || - MBEDTLS_KEY_EXCHANGE_ECDHE_PSK_ENABLED */ - -#if defined(MBEDTLS_KEY_EXCHANGE__SOME__PSK_ENABLED) -static int ssl_parse_server_psk_hint( mbedtls_ssl_context *ssl, - unsigned char **p, - unsigned char *end ) -{ - int ret = MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE; - size_t len; - ((void) ssl); - - /* - * PSK parameters: - * - * opaque psk_identity_hint<0..2^16-1>; - */ - if( end - (*p) < 2 ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad server key exchange message " - "(psk_identity_hint length)" ) ); - return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_KEY_EXCHANGE ); - } - len = (*p)[0] << 8 | (*p)[1]; - *p += 2; - - if( end - (*p) < (int) len ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad server key exchange message " - "(psk_identity_hint length)" ) ); - return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_KEY_EXCHANGE ); - } - - /* - * Note: we currently ignore the PKS identity hint, as we only allow one - * PSK to be provisionned on the client. This could be changed later if - * someone needs that feature. - */ - *p += len; - ret = 0; - - return( ret ); -} -#endif /* MBEDTLS_KEY_EXCHANGE__SOME__PSK_ENABLED */ - -#if defined(MBEDTLS_KEY_EXCHANGE_RSA_ENABLED) || \ - defined(MBEDTLS_KEY_EXCHANGE_RSA_PSK_ENABLED) -/* - * Generate a pre-master secret and encrypt it with the server's RSA key - */ -static int ssl_write_encrypted_pms( mbedtls_ssl_context *ssl, - size_t offset, size_t *olen, - size_t pms_offset ) -{ - int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; - size_t len_bytes = ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 ? 0 : 2; - unsigned char *p = ssl->handshake->premaster + pms_offset; - mbedtls_pk_context * peer_pk; - - if( offset + len_bytes > MBEDTLS_SSL_OUT_CONTENT_LEN ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "buffer too small for encrypted pms" ) ); - return( MBEDTLS_ERR_SSL_BUFFER_TOO_SMALL ); - } - - /* - * Generate (part of) the pre-master as - * struct { - * ProtocolVersion client_version; - * opaque random[46]; - * } PreMasterSecret; - */ - mbedtls_ssl_write_version( ssl->conf->max_major_ver, ssl->conf->max_minor_ver, - ssl->conf->transport, p ); - - if( ( ret = ssl->conf->f_rng( ssl->conf->p_rng, p + 2, 46 ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "f_rng", ret ); - return( ret ); - } - - ssl->handshake->pmslen = 48; - -#if !defined(MBEDTLS_SSL_KEEP_PEER_CERTIFICATE) - peer_pk = &ssl->handshake->peer_pubkey; -#else /* !MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */ - if( ssl->session_negotiate->peer_cert == NULL ) - { - /* Should never happen */ - MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) ); - return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); - } - peer_pk = &ssl->session_negotiate->peer_cert->pk; -#endif /* MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */ - - /* - * Now write it out, encrypted - */ - if( ! mbedtls_pk_can_do( peer_pk, MBEDTLS_PK_RSA ) ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "certificate key type mismatch" ) ); - return( MBEDTLS_ERR_SSL_PK_TYPE_MISMATCH ); - } - - if( ( ret = mbedtls_pk_encrypt( peer_pk, - p, ssl->handshake->pmslen, - ssl->out_msg + offset + len_bytes, olen, - MBEDTLS_SSL_OUT_CONTENT_LEN - offset - len_bytes, - ssl->conf->f_rng, ssl->conf->p_rng ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_rsa_pkcs1_encrypt", ret ); - return( ret ); - } - -#if defined(MBEDTLS_SSL_PROTO_TLS1) || defined(MBEDTLS_SSL_PROTO_TLS1_1) || \ - defined(MBEDTLS_SSL_PROTO_TLS1_2) - if( len_bytes == 2 ) - { - ssl->out_msg[offset+0] = (unsigned char)( *olen >> 8 ); - ssl->out_msg[offset+1] = (unsigned char)( *olen ); - *olen += 2; - } -#endif - -#if !defined(MBEDTLS_SSL_KEEP_PEER_CERTIFICATE) - /* We don't need the peer's public key anymore. Free it. */ - mbedtls_pk_free( peer_pk ); -#endif /* !MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */ - return( 0 ); -} -#endif /* MBEDTLS_KEY_EXCHANGE_RSA_ENABLED || - MBEDTLS_KEY_EXCHANGE_RSA_PSK_ENABLED */ - -#if defined(MBEDTLS_SSL_PROTO_TLS1_2) -#if defined(MBEDTLS_KEY_EXCHANGE_DHE_RSA_ENABLED) || \ - defined(MBEDTLS_KEY_EXCHANGE_ECDHE_RSA_ENABLED) || \ - defined(MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED) -static int ssl_parse_signature_algorithm( mbedtls_ssl_context *ssl, - unsigned char **p, - unsigned char *end, - mbedtls_md_type_t *md_alg, - mbedtls_pk_type_t *pk_alg ) -{ - ((void) ssl); - *md_alg = MBEDTLS_MD_NONE; - *pk_alg = MBEDTLS_PK_NONE; - - /* Only in TLS 1.2 */ - if( ssl->minor_ver != MBEDTLS_SSL_MINOR_VERSION_3 ) - { - return( 0 ); - } - - if( (*p) + 2 > end ) - return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_KEY_EXCHANGE ); - - /* - * Get hash algorithm - */ - if( ( *md_alg = mbedtls_ssl_md_alg_from_hash( (*p)[0] ) ) == MBEDTLS_MD_NONE ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "Server used unsupported " - "HashAlgorithm %d", *(p)[0] ) ); - return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_KEY_EXCHANGE ); - } - - /* - * Get signature algorithm - */ - if( ( *pk_alg = mbedtls_ssl_pk_alg_from_sig( (*p)[1] ) ) == MBEDTLS_PK_NONE ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "server used unsupported " - "SignatureAlgorithm %d", (*p)[1] ) ); - return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_KEY_EXCHANGE ); - } - - /* - * Check if the hash is acceptable - */ - if( mbedtls_ssl_check_sig_hash( ssl, *md_alg ) != 0 ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "server used HashAlgorithm %d that was not offered", - *(p)[0] ) ); - return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_KEY_EXCHANGE ); - } - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "Server used SignatureAlgorithm %d", (*p)[1] ) ); - MBEDTLS_SSL_DEBUG_MSG( 2, ( "Server used HashAlgorithm %d", (*p)[0] ) ); - *p += 2; - - return( 0 ); -} -#endif /* MBEDTLS_KEY_EXCHANGE_DHE_RSA_ENABLED || - MBEDTLS_KEY_EXCHANGE_ECDHE_RSA_ENABLED || - MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED */ -#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */ - -#if defined(MBEDTLS_KEY_EXCHANGE_ECDH_RSA_ENABLED) || \ - defined(MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA_ENABLED) -static int ssl_get_ecdh_params_from_cert( mbedtls_ssl_context *ssl ) -{ - int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; - const mbedtls_ecp_keypair *peer_key; - mbedtls_pk_context * peer_pk; - -#if !defined(MBEDTLS_SSL_KEEP_PEER_CERTIFICATE) - peer_pk = &ssl->handshake->peer_pubkey; -#else /* !MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */ - if( ssl->session_negotiate->peer_cert == NULL ) - { - /* Should never happen */ - MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) ); - return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); - } - peer_pk = &ssl->session_negotiate->peer_cert->pk; -#endif /* MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */ - - if( ! mbedtls_pk_can_do( peer_pk, MBEDTLS_PK_ECKEY ) ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "server key not ECDH capable" ) ); - return( MBEDTLS_ERR_SSL_PK_TYPE_MISMATCH ); - } - - peer_key = mbedtls_pk_ec( *peer_pk ); - - if( ( ret = mbedtls_ecdh_get_params( &ssl->handshake->ecdh_ctx, peer_key, - MBEDTLS_ECDH_THEIRS ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, ( "mbedtls_ecdh_get_params" ), ret ); - return( ret ); - } - - if( ssl_check_server_ecdh_params( ssl ) != 0 ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad server certificate (ECDH curve)" ) ); - return( MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE ); - } - -#if !defined(MBEDTLS_SSL_KEEP_PEER_CERTIFICATE) - /* We don't need the peer's public key anymore. Free it, - * so that more RAM is available for upcoming expensive - * operations like ECDHE. */ - mbedtls_pk_free( peer_pk ); -#endif /* !MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */ - - return( ret ); -} -#endif /* MBEDTLS_KEY_EXCHANGE_ECDH_RSA_ENABLED) || - MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA_ENABLED */ - -static int ssl_parse_server_key_exchange( mbedtls_ssl_context *ssl ) -{ - int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; - const mbedtls_ssl_ciphersuite_t *ciphersuite_info = - ssl->handshake->ciphersuite_info; - unsigned char *p = NULL, *end = NULL; - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> parse server key exchange" ) ); - -#if defined(MBEDTLS_KEY_EXCHANGE_RSA_ENABLED) - if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_RSA ) - { - MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= skip parse server key exchange" ) ); - ssl->state++; - return( 0 ); - } - ((void) p); - ((void) end); -#endif - -#if defined(MBEDTLS_KEY_EXCHANGE_ECDH_RSA_ENABLED) || \ - defined(MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA_ENABLED) - if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDH_RSA || - ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA ) - { - if( ( ret = ssl_get_ecdh_params_from_cert( ssl ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "ssl_get_ecdh_params_from_cert", ret ); - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE ); - return( ret ); - } - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= skip parse server key exchange" ) ); - ssl->state++; - return( 0 ); - } - ((void) p); - ((void) end); -#endif /* MBEDTLS_KEY_EXCHANGE_ECDH_RSA_ENABLED || - MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA_ENABLED */ - -#if defined(MBEDTLS_SSL__ECP_RESTARTABLE) - if( ssl->handshake->ecrs_enabled && - ssl->handshake->ecrs_state == ssl_ecrs_ske_start_processing ) - { - goto start_processing; - } -#endif - - if( ( ret = mbedtls_ssl_read_record( ssl, 1 ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_read_record", ret ); - return( ret ); - } - - if( ssl->in_msgtype != MBEDTLS_SSL_MSG_HANDSHAKE ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad server key exchange message" ) ); - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_UNEXPECTED_MESSAGE ); - return( MBEDTLS_ERR_SSL_UNEXPECTED_MESSAGE ); - } - - /* - * ServerKeyExchange may be skipped with PSK and RSA-PSK when the server - * doesn't use a psk_identity_hint - */ - if( ssl->in_msg[0] != MBEDTLS_SSL_HS_SERVER_KEY_EXCHANGE ) - { - if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_PSK || - ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_RSA_PSK ) - { - /* Current message is probably either - * CertificateRequest or ServerHelloDone */ - ssl->keep_current_message = 1; - goto exit; - } - - MBEDTLS_SSL_DEBUG_MSG( 1, ( "server key exchange message must " - "not be skipped" ) ); - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_UNEXPECTED_MESSAGE ); - - return( MBEDTLS_ERR_SSL_UNEXPECTED_MESSAGE ); - } - -#if defined(MBEDTLS_SSL__ECP_RESTARTABLE) - if( ssl->handshake->ecrs_enabled ) - ssl->handshake->ecrs_state = ssl_ecrs_ske_start_processing; - -start_processing: -#endif - p = ssl->in_msg + mbedtls_ssl_hs_hdr_len( ssl ); - end = ssl->in_msg + ssl->in_hslen; - MBEDTLS_SSL_DEBUG_BUF( 3, "server key exchange", p, end - p ); - -#if defined(MBEDTLS_KEY_EXCHANGE__SOME__PSK_ENABLED) - if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_PSK || - ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_RSA_PSK || - ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_DHE_PSK || - ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDHE_PSK ) - { - if( ssl_parse_server_psk_hint( ssl, &p, end ) != 0 ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad server key exchange message" ) ); - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_ILLEGAL_PARAMETER ); - return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_KEY_EXCHANGE ); - } - } /* FALLTROUGH */ -#endif /* MBEDTLS_KEY_EXCHANGE__SOME__PSK_ENABLED */ - -#if defined(MBEDTLS_KEY_EXCHANGE_PSK_ENABLED) || \ - defined(MBEDTLS_KEY_EXCHANGE_RSA_PSK_ENABLED) - if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_PSK || - ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_RSA_PSK ) - ; /* nothing more to do */ - else -#endif /* MBEDTLS_KEY_EXCHANGE_PSK_ENABLED || - MBEDTLS_KEY_EXCHANGE_RSA_PSK_ENABLED */ -#if defined(MBEDTLS_KEY_EXCHANGE_DHE_RSA_ENABLED) || \ - defined(MBEDTLS_KEY_EXCHANGE_DHE_PSK_ENABLED) - if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_DHE_RSA || - ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_DHE_PSK ) - { - if( ssl_parse_server_dh_params( ssl, &p, end ) != 0 ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad server key exchange message" ) ); - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_ILLEGAL_PARAMETER ); - return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_KEY_EXCHANGE ); - } - } - else -#endif /* MBEDTLS_KEY_EXCHANGE_DHE_RSA_ENABLED || - MBEDTLS_KEY_EXCHANGE_DHE_PSK_ENABLED */ -#if defined(MBEDTLS_USE_PSA_CRYPTO) && \ - ( defined(MBEDTLS_KEY_EXCHANGE_ECDHE_RSA_ENABLED) || \ - defined(MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED) ) - if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDHE_RSA || - ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA ) - { - if( ssl_parse_server_ecdh_params_psa( ssl, &p, end ) != 0 ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad server key exchange message" ) ); - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_ILLEGAL_PARAMETER ); - return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_KEY_EXCHANGE ); - } - } - else -#endif /* MBEDTLS_USE_PSA_CRYPTO && - ( MBEDTLS_KEY_EXCHANGE_ECDHE_RSA_ENABLED || - MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED ) */ -#if defined(MBEDTLS_KEY_EXCHANGE_ECDHE_RSA_ENABLED) || \ - defined(MBEDTLS_KEY_EXCHANGE_ECDHE_PSK_ENABLED) || \ - defined(MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED) - if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDHE_RSA || - ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDHE_PSK || - ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA ) - { - if( ssl_parse_server_ecdh_params( ssl, &p, end ) != 0 ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad server key exchange message" ) ); - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_ILLEGAL_PARAMETER ); - return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_KEY_EXCHANGE ); - } - } - else -#endif /* MBEDTLS_KEY_EXCHANGE_ECDHE_RSA_ENABLED || - MBEDTLS_KEY_EXCHANGE_ECDHE_PSK_ENABLED || - MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED */ -#if defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED) - if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECJPAKE ) - { - ret = mbedtls_ecjpake_read_round_two( &ssl->handshake->ecjpake_ctx, - p, end - p ); - if( ret != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ecjpake_read_round_two", ret ); - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_ILLEGAL_PARAMETER ); - return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_KEY_EXCHANGE ); - } - } - else -#endif /* MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED */ - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) ); - return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); - } - -#if defined(MBEDTLS_KEY_EXCHANGE__WITH_SERVER_SIGNATURE__ENABLED) - if( mbedtls_ssl_ciphersuite_uses_server_signature( ciphersuite_info ) ) - { - size_t sig_len, hashlen; - unsigned char hash[64]; - mbedtls_md_type_t md_alg = MBEDTLS_MD_NONE; - mbedtls_pk_type_t pk_alg = MBEDTLS_PK_NONE; - unsigned char *params = ssl->in_msg + mbedtls_ssl_hs_hdr_len( ssl ); - size_t params_len = p - params; - void *rs_ctx = NULL; - - mbedtls_pk_context * peer_pk; - - /* - * Handle the digitally-signed structure - */ -#if defined(MBEDTLS_SSL_PROTO_TLS1_2) - if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_3 ) - { - if( ssl_parse_signature_algorithm( ssl, &p, end, - &md_alg, &pk_alg ) != 0 ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad server key exchange message" ) ); - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_ILLEGAL_PARAMETER ); - return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_KEY_EXCHANGE ); - } - - if( pk_alg != mbedtls_ssl_get_ciphersuite_sig_pk_alg( ciphersuite_info ) ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad server key exchange message" ) ); - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_ILLEGAL_PARAMETER ); - return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_KEY_EXCHANGE ); - } - } - else -#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */ -#if defined(MBEDTLS_SSL_PROTO_SSL3) || defined(MBEDTLS_SSL_PROTO_TLS1) || \ - defined(MBEDTLS_SSL_PROTO_TLS1_1) - if( ssl->minor_ver < MBEDTLS_SSL_MINOR_VERSION_3 ) - { - pk_alg = mbedtls_ssl_get_ciphersuite_sig_pk_alg( ciphersuite_info ); - - /* Default hash for ECDSA is SHA-1 */ - if( pk_alg == MBEDTLS_PK_ECDSA && md_alg == MBEDTLS_MD_NONE ) - md_alg = MBEDTLS_MD_SHA1; - } - else -#endif - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) ); - return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); - } - - /* - * Read signature - */ - - if( p > end - 2 ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad server key exchange message" ) ); - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR ); - return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_KEY_EXCHANGE ); - } - sig_len = ( p[0] << 8 ) | p[1]; - p += 2; - - if( p != end - sig_len ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad server key exchange message" ) ); - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR ); - return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_KEY_EXCHANGE ); - } - - MBEDTLS_SSL_DEBUG_BUF( 3, "signature", p, sig_len ); - - /* - * Compute the hash that has been signed - */ -#if defined(MBEDTLS_SSL_PROTO_SSL3) || defined(MBEDTLS_SSL_PROTO_TLS1) || \ - defined(MBEDTLS_SSL_PROTO_TLS1_1) - if( md_alg == MBEDTLS_MD_NONE ) - { - hashlen = 36; - ret = mbedtls_ssl_get_key_exchange_md_ssl_tls( ssl, hash, params, - params_len ); - if( ret != 0 ) - return( ret ); - } - else -#endif /* MBEDTLS_SSL_PROTO_SSL3 || MBEDTLS_SSL_PROTO_TLS1 || \ - MBEDTLS_SSL_PROTO_TLS1_1 */ -#if defined(MBEDTLS_SSL_PROTO_TLS1) || defined(MBEDTLS_SSL_PROTO_TLS1_1) || \ - defined(MBEDTLS_SSL_PROTO_TLS1_2) - if( md_alg != MBEDTLS_MD_NONE ) - { - ret = mbedtls_ssl_get_key_exchange_md_tls1_2( ssl, hash, &hashlen, - params, params_len, - md_alg ); - if( ret != 0 ) - return( ret ); - } - else -#endif /* MBEDTLS_SSL_PROTO_TLS1 || MBEDTLS_SSL_PROTO_TLS1_1 || \ - MBEDTLS_SSL_PROTO_TLS1_2 */ - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) ); - return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); - } - - MBEDTLS_SSL_DEBUG_BUF( 3, "parameters hash", hash, hashlen ); - -#if !defined(MBEDTLS_SSL_KEEP_PEER_CERTIFICATE) - peer_pk = &ssl->handshake->peer_pubkey; -#else /* !MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */ - if( ssl->session_negotiate->peer_cert == NULL ) - { - /* Should never happen */ - MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) ); - return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); - } - peer_pk = &ssl->session_negotiate->peer_cert->pk; -#endif /* MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */ - - /* - * Verify signature - */ - if( !mbedtls_pk_can_do( peer_pk, pk_alg ) ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad server key exchange message" ) ); - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE ); - return( MBEDTLS_ERR_SSL_PK_TYPE_MISMATCH ); - } - -#if defined(MBEDTLS_SSL__ECP_RESTARTABLE) - if( ssl->handshake->ecrs_enabled ) - rs_ctx = &ssl->handshake->ecrs_ctx.pk; -#endif - - if( ( ret = mbedtls_pk_verify_restartable( peer_pk, - md_alg, hash, hashlen, p, sig_len, rs_ctx ) ) != 0 ) - { -#if defined(MBEDTLS_SSL__ECP_RESTARTABLE) - if( ret != MBEDTLS_ERR_ECP_IN_PROGRESS ) -#endif - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_DECRYPT_ERROR ); - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_pk_verify", ret ); -#if defined(MBEDTLS_SSL__ECP_RESTARTABLE) - if( ret == MBEDTLS_ERR_ECP_IN_PROGRESS ) - ret = MBEDTLS_ERR_SSL_CRYPTO_IN_PROGRESS; -#endif - return( ret ); - } - -#if !defined(MBEDTLS_SSL_KEEP_PEER_CERTIFICATE) - /* We don't need the peer's public key anymore. Free it, - * so that more RAM is available for upcoming expensive - * operations like ECDHE. */ - mbedtls_pk_free( peer_pk ); -#endif /* !MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */ - } -#endif /* MBEDTLS_KEY_EXCHANGE__WITH_SERVER_SIGNATURE__ENABLED */ - -exit: - ssl->state++; - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= parse server key exchange" ) ); - - return( 0 ); -} - -#if ! defined(MBEDTLS_KEY_EXCHANGE__CERT_REQ_ALLOWED__ENABLED) -static int ssl_parse_certificate_request( mbedtls_ssl_context *ssl ) -{ - const mbedtls_ssl_ciphersuite_t *ciphersuite_info = - ssl->handshake->ciphersuite_info; - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> parse certificate request" ) ); - - if( ! mbedtls_ssl_ciphersuite_cert_req_allowed( ciphersuite_info ) ) - { - MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= skip parse certificate request" ) ); - ssl->state++; - return( 0 ); - } - - MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) ); - return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); -} -#else /* MBEDTLS_KEY_EXCHANGE__CERT_REQ_ALLOWED__ENABLED */ -static int ssl_parse_certificate_request( mbedtls_ssl_context *ssl ) -{ - int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; - unsigned char *buf; - size_t n = 0; - size_t cert_type_len = 0, dn_len = 0; - const mbedtls_ssl_ciphersuite_t *ciphersuite_info = - ssl->handshake->ciphersuite_info; - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> parse certificate request" ) ); - - if( ! mbedtls_ssl_ciphersuite_cert_req_allowed( ciphersuite_info ) ) - { - MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= skip parse certificate request" ) ); - ssl->state++; - return( 0 ); - } - - if( ( ret = mbedtls_ssl_read_record( ssl, 1 ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_read_record", ret ); - return( ret ); - } - - if( ssl->in_msgtype != MBEDTLS_SSL_MSG_HANDSHAKE ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad certificate request message" ) ); - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_UNEXPECTED_MESSAGE ); - return( MBEDTLS_ERR_SSL_UNEXPECTED_MESSAGE ); - } - - ssl->state++; - ssl->client_auth = ( ssl->in_msg[0] == MBEDTLS_SSL_HS_CERTIFICATE_REQUEST ); - - MBEDTLS_SSL_DEBUG_MSG( 3, ( "got %s certificate request", - ssl->client_auth ? "a" : "no" ) ); - - if( ssl->client_auth == 0 ) - { - /* Current message is probably the ServerHelloDone */ - ssl->keep_current_message = 1; - goto exit; - } - - /* - * struct { - * ClientCertificateType certificate_types<1..2^8-1>; - * SignatureAndHashAlgorithm - * supported_signature_algorithms<2^16-1>; -- TLS 1.2 only - * DistinguishedName certificate_authorities<0..2^16-1>; - * } CertificateRequest; - * - * Since we only support a single certificate on clients, let's just - * ignore all the information that's supposed to help us pick a - * certificate. - * - * We could check that our certificate matches the request, and bail out - * if it doesn't, but it's simpler to just send the certificate anyway, - * and give the server the opportunity to decide if it should terminate - * the connection when it doesn't like our certificate. - * - * Same goes for the hash in TLS 1.2's signature_algorithms: at this - * point we only have one hash available (see comments in - * write_certificate_verify), so let's just use what we have. - * - * However, we still minimally parse the message to check it is at least - * superficially sane. - */ - buf = ssl->in_msg; - - /* certificate_types */ - if( ssl->in_hslen <= mbedtls_ssl_hs_hdr_len( ssl ) ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad certificate request message" ) ); - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR ); - return( MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE_REQUEST ); - } - cert_type_len = buf[mbedtls_ssl_hs_hdr_len( ssl )]; - n = cert_type_len; - - /* - * In the subsequent code there are two paths that read from buf: - * * the length of the signature algorithms field (if minor version of - * SSL is 3), - * * distinguished name length otherwise. - * Both reach at most the index: - * ...hdr_len + 2 + n, - * therefore the buffer length at this point must be greater than that - * regardless of the actual code path. - */ - if( ssl->in_hslen <= mbedtls_ssl_hs_hdr_len( ssl ) + 2 + n ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad certificate request message" ) ); - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR ); - return( MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE_REQUEST ); - } - - /* supported_signature_algorithms */ -#if defined(MBEDTLS_SSL_PROTO_TLS1_2) - if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_3 ) - { - size_t sig_alg_len = ( ( buf[mbedtls_ssl_hs_hdr_len( ssl ) + 1 + n] << 8 ) - | ( buf[mbedtls_ssl_hs_hdr_len( ssl ) + 2 + n] ) ); -#if defined(MBEDTLS_DEBUG_C) - unsigned char* sig_alg; - size_t i; -#endif - - /* - * The furthest access in buf is in the loop few lines below: - * sig_alg[i + 1], - * where: - * sig_alg = buf + ...hdr_len + 3 + n, - * max(i) = sig_alg_len - 1. - * Therefore the furthest access is: - * buf[...hdr_len + 3 + n + sig_alg_len - 1 + 1], - * which reduces to: - * buf[...hdr_len + 3 + n + sig_alg_len], - * which is one less than we need the buf to be. - */ - if( ssl->in_hslen <= mbedtls_ssl_hs_hdr_len( ssl ) + 3 + n + sig_alg_len ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad certificate request message" ) ); - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR ); - return( MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE_REQUEST ); - } - -#if defined(MBEDTLS_DEBUG_C) - sig_alg = buf + mbedtls_ssl_hs_hdr_len( ssl ) + 3 + n; - for( i = 0; i < sig_alg_len; i += 2 ) - { - MBEDTLS_SSL_DEBUG_MSG( 3, ( "Supported Signature Algorithm found: %d" - ",%d", sig_alg[i], sig_alg[i + 1] ) ); - } -#endif - - n += 2 + sig_alg_len; - } -#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */ - - /* certificate_authorities */ - dn_len = ( ( buf[mbedtls_ssl_hs_hdr_len( ssl ) + 1 + n] << 8 ) - | ( buf[mbedtls_ssl_hs_hdr_len( ssl ) + 2 + n] ) ); - - n += dn_len; - if( ssl->in_hslen != mbedtls_ssl_hs_hdr_len( ssl ) + 3 + n ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad certificate request message" ) ); - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR ); - return( MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE_REQUEST ); - } - -exit: - MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= parse certificate request" ) ); - - return( 0 ); -} -#endif /* MBEDTLS_KEY_EXCHANGE__CERT_REQ_ALLOWED__ENABLED */ - -static int ssl_parse_server_hello_done( mbedtls_ssl_context *ssl ) -{ - int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> parse server hello done" ) ); - - if( ( ret = mbedtls_ssl_read_record( ssl, 1 ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_read_record", ret ); - return( ret ); - } - - if( ssl->in_msgtype != MBEDTLS_SSL_MSG_HANDSHAKE ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad server hello done message" ) ); - return( MBEDTLS_ERR_SSL_UNEXPECTED_MESSAGE ); - } - - if( ssl->in_hslen != mbedtls_ssl_hs_hdr_len( ssl ) || - ssl->in_msg[0] != MBEDTLS_SSL_HS_SERVER_HELLO_DONE ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad server hello done message" ) ); - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR ); - return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO_DONE ); - } - - ssl->state++; - -#if defined(MBEDTLS_SSL_PROTO_DTLS) - if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM ) - mbedtls_ssl_recv_flight_completed( ssl ); -#endif - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= parse server hello done" ) ); - - return( 0 ); -} - -static int ssl_write_client_key_exchange( mbedtls_ssl_context *ssl ) -{ - int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; - - size_t header_len; - size_t content_len; - const mbedtls_ssl_ciphersuite_t *ciphersuite_info = - ssl->handshake->ciphersuite_info; - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> write client key exchange" ) ); - -#if defined(MBEDTLS_KEY_EXCHANGE_DHE_RSA_ENABLED) - if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_DHE_RSA ) - { - /* - * DHM key exchange -- send G^X mod P - */ - content_len = ssl->handshake->dhm_ctx.len; - - ssl->out_msg[4] = (unsigned char)( content_len >> 8 ); - ssl->out_msg[5] = (unsigned char)( content_len ); - header_len = 6; - - ret = mbedtls_dhm_make_public( &ssl->handshake->dhm_ctx, - (int) mbedtls_mpi_size( &ssl->handshake->dhm_ctx.P ), - &ssl->out_msg[header_len], content_len, - ssl->conf->f_rng, ssl->conf->p_rng ); - if( ret != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_dhm_make_public", ret ); - return( ret ); - } - - MBEDTLS_SSL_DEBUG_MPI( 3, "DHM: X ", &ssl->handshake->dhm_ctx.X ); - MBEDTLS_SSL_DEBUG_MPI( 3, "DHM: GX", &ssl->handshake->dhm_ctx.GX ); - - if( ( ret = mbedtls_dhm_calc_secret( &ssl->handshake->dhm_ctx, - ssl->handshake->premaster, - MBEDTLS_PREMASTER_SIZE, - &ssl->handshake->pmslen, - ssl->conf->f_rng, ssl->conf->p_rng ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_dhm_calc_secret", ret ); - return( ret ); - } - - MBEDTLS_SSL_DEBUG_MPI( 3, "DHM: K ", &ssl->handshake->dhm_ctx.K ); - } - else -#endif /* MBEDTLS_KEY_EXCHANGE_DHE_RSA_ENABLED */ -#if defined(MBEDTLS_USE_PSA_CRYPTO) && \ - ( defined(MBEDTLS_KEY_EXCHANGE_ECDHE_RSA_ENABLED) || \ - defined(MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED) ) - if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDHE_RSA || - ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA ) - { - psa_status_t status; - psa_key_attributes_t key_attributes; - - mbedtls_ssl_handshake_params *handshake = ssl->handshake; - - unsigned char own_pubkey[MBEDTLS_PSA_MAX_EC_PUBKEY_LENGTH]; - size_t own_pubkey_len; - unsigned char *own_pubkey_ecpoint; - size_t own_pubkey_ecpoint_len; - - header_len = 4; - - MBEDTLS_SSL_DEBUG_MSG( 1, ( "Perform PSA-based ECDH computation." ) ); - - /* - * Generate EC private key for ECDHE exchange. - */ - - /* The master secret is obtained from the shared ECDH secret by - * applying the TLS 1.2 PRF with a specific salt and label. While - * the PSA Crypto API encourages combining key agreement schemes - * such as ECDH with fixed KDFs such as TLS 1.2 PRF, it does not - * yet support the provisioning of salt + label to the KDF. - * For the time being, we therefore need to split the computation - * of the ECDH secret and the application of the TLS 1.2 PRF. */ - key_attributes = psa_key_attributes_init(); - psa_set_key_usage_flags( &key_attributes, PSA_KEY_USAGE_DERIVE ); - psa_set_key_algorithm( &key_attributes, PSA_ALG_ECDH ); - psa_set_key_type( &key_attributes, handshake->ecdh_psa_type ); - psa_set_key_bits( &key_attributes, handshake->ecdh_bits ); - - /* Generate ECDH private key. */ - status = psa_generate_key( &key_attributes, - &handshake->ecdh_psa_privkey ); - if( status != PSA_SUCCESS ) - return( MBEDTLS_ERR_SSL_HW_ACCEL_FAILED ); - - /* Export the public part of the ECDH private key from PSA - * and convert it to ECPoint format used in ClientKeyExchange. */ - status = psa_export_public_key( handshake->ecdh_psa_privkey, - own_pubkey, sizeof( own_pubkey ), - &own_pubkey_len ); - if( status != PSA_SUCCESS ) - return( MBEDTLS_ERR_SSL_HW_ACCEL_FAILED ); - - if( mbedtls_psa_tls_psa_ec_to_ecpoint( own_pubkey, - own_pubkey_len, - &own_pubkey_ecpoint, - &own_pubkey_ecpoint_len ) != 0 ) - { - return( MBEDTLS_ERR_SSL_HW_ACCEL_FAILED ); - } - - /* Copy ECPoint structure to outgoing message buffer. */ - ssl->out_msg[header_len] = (unsigned char) own_pubkey_ecpoint_len; - memcpy( ssl->out_msg + header_len + 1, - own_pubkey_ecpoint, own_pubkey_ecpoint_len ); - content_len = own_pubkey_ecpoint_len + 1; - - /* The ECDH secret is the premaster secret used for key derivation. */ - - /* Compute ECDH shared secret. */ - status = psa_raw_key_agreement( PSA_ALG_ECDH, - handshake->ecdh_psa_privkey, - handshake->ecdh_psa_peerkey, - handshake->ecdh_psa_peerkey_len, - ssl->handshake->premaster, - sizeof( ssl->handshake->premaster ), - &ssl->handshake->pmslen ); - if( status != PSA_SUCCESS ) - return( MBEDTLS_ERR_SSL_HW_ACCEL_FAILED ); - - status = psa_destroy_key( handshake->ecdh_psa_privkey ); - if( status != PSA_SUCCESS ) - return( MBEDTLS_ERR_SSL_HW_ACCEL_FAILED ); - handshake->ecdh_psa_privkey = 0; - } - else -#endif /* MBEDTLS_USE_PSA_CRYPTO && - ( MBEDTLS_KEY_EXCHANGE_ECDHE_RSA_ENABLED || - MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED ) */ -#if defined(MBEDTLS_KEY_EXCHANGE_ECDHE_RSA_ENABLED) || \ - defined(MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED) || \ - defined(MBEDTLS_KEY_EXCHANGE_ECDH_RSA_ENABLED) || \ - defined(MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA_ENABLED) - if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDHE_RSA || - ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA || - ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDH_RSA || - ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA ) - { - /* - * ECDH key exchange -- send client public value - */ - header_len = 4; - -#if defined(MBEDTLS_SSL__ECP_RESTARTABLE) - if( ssl->handshake->ecrs_enabled ) - { - if( ssl->handshake->ecrs_state == ssl_ecrs_cke_ecdh_calc_secret ) - goto ecdh_calc_secret; - - mbedtls_ecdh_enable_restart( &ssl->handshake->ecdh_ctx ); - } -#endif - - ret = mbedtls_ecdh_make_public( &ssl->handshake->ecdh_ctx, - &content_len, - &ssl->out_msg[header_len], 1000, - ssl->conf->f_rng, ssl->conf->p_rng ); - if( ret != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ecdh_make_public", ret ); -#if defined(MBEDTLS_SSL__ECP_RESTARTABLE) - if( ret == MBEDTLS_ERR_ECP_IN_PROGRESS ) - ret = MBEDTLS_ERR_SSL_CRYPTO_IN_PROGRESS; -#endif - return( ret ); - } - - MBEDTLS_SSL_DEBUG_ECDH( 3, &ssl->handshake->ecdh_ctx, - MBEDTLS_DEBUG_ECDH_Q ); - -#if defined(MBEDTLS_SSL__ECP_RESTARTABLE) - if( ssl->handshake->ecrs_enabled ) - { - ssl->handshake->ecrs_n = content_len; - ssl->handshake->ecrs_state = ssl_ecrs_cke_ecdh_calc_secret; - } - -ecdh_calc_secret: - if( ssl->handshake->ecrs_enabled ) - content_len = ssl->handshake->ecrs_n; -#endif - if( ( ret = mbedtls_ecdh_calc_secret( &ssl->handshake->ecdh_ctx, - &ssl->handshake->pmslen, - ssl->handshake->premaster, - MBEDTLS_MPI_MAX_SIZE, - ssl->conf->f_rng, ssl->conf->p_rng ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ecdh_calc_secret", ret ); -#if defined(MBEDTLS_SSL__ECP_RESTARTABLE) - if( ret == MBEDTLS_ERR_ECP_IN_PROGRESS ) - ret = MBEDTLS_ERR_SSL_CRYPTO_IN_PROGRESS; -#endif - return( ret ); - } - - MBEDTLS_SSL_DEBUG_ECDH( 3, &ssl->handshake->ecdh_ctx, - MBEDTLS_DEBUG_ECDH_Z ); - } - else -#endif /* MBEDTLS_KEY_EXCHANGE_ECDHE_RSA_ENABLED || - MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED || - MBEDTLS_KEY_EXCHANGE_ECDH_RSA_ENABLED || - MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA_ENABLED */ -#if defined(MBEDTLS_KEY_EXCHANGE__SOME__PSK_ENABLED) - if( mbedtls_ssl_ciphersuite_uses_psk( ciphersuite_info ) ) - { - /* - * opaque psk_identity<0..2^16-1>; - */ - if( ssl_conf_has_static_psk( ssl->conf ) == 0 ) - { - /* We don't offer PSK suites if we don't have a PSK, - * and we check that the server's choice is among the - * ciphersuites we offered, so this should never happen. */ - return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); - } - - header_len = 4; - content_len = ssl->conf->psk_identity_len; - - if( header_len + 2 + content_len > MBEDTLS_SSL_OUT_CONTENT_LEN ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "psk identity too long or " - "SSL buffer too short" ) ); - return( MBEDTLS_ERR_SSL_BUFFER_TOO_SMALL ); - } - - ssl->out_msg[header_len++] = (unsigned char)( content_len >> 8 ); - ssl->out_msg[header_len++] = (unsigned char)( content_len ); - - memcpy( ssl->out_msg + header_len, - ssl->conf->psk_identity, - ssl->conf->psk_identity_len ); - header_len += ssl->conf->psk_identity_len; - -#if defined(MBEDTLS_KEY_EXCHANGE_PSK_ENABLED) - if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_PSK ) - { - content_len = 0; - } - else -#endif -#if defined(MBEDTLS_KEY_EXCHANGE_RSA_PSK_ENABLED) - if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_RSA_PSK ) - { -#if defined(MBEDTLS_USE_PSA_CRYPTO) - /* Opaque PSKs are currently only supported for PSK-only suites. */ - if( ssl_conf_has_static_raw_psk( ssl->conf ) == 0 ) - return( MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE ); -#endif /* MBEDTLS_USE_PSA_CRYPTO */ - - if( ( ret = ssl_write_encrypted_pms( ssl, header_len, - &content_len, 2 ) ) != 0 ) - return( ret ); - } - else -#endif -#if defined(MBEDTLS_KEY_EXCHANGE_DHE_PSK_ENABLED) - if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_DHE_PSK ) - { -#if defined(MBEDTLS_USE_PSA_CRYPTO) - /* Opaque PSKs are currently only supported for PSK-only suites. */ - if( ssl_conf_has_static_raw_psk( ssl->conf ) == 0 ) - return( MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE ); -#endif /* MBEDTLS_USE_PSA_CRYPTO */ - - /* - * ClientDiffieHellmanPublic public (DHM send G^X mod P) - */ - content_len = ssl->handshake->dhm_ctx.len; - - if( header_len + 2 + content_len > - MBEDTLS_SSL_OUT_CONTENT_LEN ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "psk identity or DHM size too long" - " or SSL buffer too short" ) ); - return( MBEDTLS_ERR_SSL_BUFFER_TOO_SMALL ); - } - - ssl->out_msg[header_len++] = (unsigned char)( content_len >> 8 ); - ssl->out_msg[header_len++] = (unsigned char)( content_len ); - - ret = mbedtls_dhm_make_public( &ssl->handshake->dhm_ctx, - (int) mbedtls_mpi_size( &ssl->handshake->dhm_ctx.P ), - &ssl->out_msg[header_len], content_len, - ssl->conf->f_rng, ssl->conf->p_rng ); - if( ret != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_dhm_make_public", ret ); - return( ret ); - } - } - else -#endif /* MBEDTLS_KEY_EXCHANGE_DHE_PSK_ENABLED */ -#if defined(MBEDTLS_KEY_EXCHANGE_ECDHE_PSK_ENABLED) - if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDHE_PSK ) - { -#if defined(MBEDTLS_USE_PSA_CRYPTO) - /* Opaque PSKs are currently only supported for PSK-only suites. */ - if( ssl_conf_has_static_raw_psk( ssl->conf ) == 0 ) - return( MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE ); -#endif /* MBEDTLS_USE_PSA_CRYPTO */ - - /* - * ClientECDiffieHellmanPublic public; - */ - ret = mbedtls_ecdh_make_public( &ssl->handshake->ecdh_ctx, - &content_len, - &ssl->out_msg[header_len], - MBEDTLS_SSL_OUT_CONTENT_LEN - header_len, - ssl->conf->f_rng, ssl->conf->p_rng ); - if( ret != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ecdh_make_public", ret ); - return( ret ); - } - - MBEDTLS_SSL_DEBUG_ECDH( 3, &ssl->handshake->ecdh_ctx, - MBEDTLS_DEBUG_ECDH_Q ); - } - else -#endif /* MBEDTLS_KEY_EXCHANGE_ECDHE_PSK_ENABLED */ - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) ); - return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); - } - -#if defined(MBEDTLS_USE_PSA_CRYPTO) && \ - defined(MBEDTLS_KEY_EXCHANGE_PSK_ENABLED) - if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_PSK && - ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_3 && - ssl_conf_has_static_raw_psk( ssl->conf ) == 0 ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "skip PMS generation for opaque PSK" ) ); - } - else -#endif /* MBEDTLS_USE_PSA_CRYPTO && - MBEDTLS_KEY_EXCHANGE_PSK_ENABLED */ - if( ( ret = mbedtls_ssl_psk_derive_premaster( ssl, - ciphersuite_info->key_exchange ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_psk_derive_premaster", ret ); - return( ret ); - } - } - else -#endif /* MBEDTLS_KEY_EXCHANGE__SOME__PSK_ENABLED */ -#if defined(MBEDTLS_KEY_EXCHANGE_RSA_ENABLED) - if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_RSA ) - { - header_len = 4; - if( ( ret = ssl_write_encrypted_pms( ssl, header_len, - &content_len, 0 ) ) != 0 ) - return( ret ); - } - else -#endif /* MBEDTLS_KEY_EXCHANGE_RSA_ENABLED */ -#if defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED) - if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECJPAKE ) - { - header_len = 4; - - ret = mbedtls_ecjpake_write_round_two( &ssl->handshake->ecjpake_ctx, - ssl->out_msg + header_len, - MBEDTLS_SSL_OUT_CONTENT_LEN - header_len, - &content_len, - ssl->conf->f_rng, ssl->conf->p_rng ); - if( ret != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ecjpake_write_round_two", ret ); - return( ret ); - } - - ret = mbedtls_ecjpake_derive_secret( &ssl->handshake->ecjpake_ctx, - ssl->handshake->premaster, 32, &ssl->handshake->pmslen, - ssl->conf->f_rng, ssl->conf->p_rng ); - if( ret != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ecjpake_derive_secret", ret ); - return( ret ); - } - } - else -#endif /* MBEDTLS_KEY_EXCHANGE_RSA_ENABLED */ - { - ((void) ciphersuite_info); - MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) ); - return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); - } - - ssl->out_msglen = header_len + content_len; - ssl->out_msgtype = MBEDTLS_SSL_MSG_HANDSHAKE; - ssl->out_msg[0] = MBEDTLS_SSL_HS_CLIENT_KEY_EXCHANGE; - - ssl->state++; - - if( ( ret = mbedtls_ssl_write_handshake_msg( ssl ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_write_handshake_msg", ret ); - return( ret ); - } - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= write client key exchange" ) ); - - return( 0 ); -} - -#if !defined(MBEDTLS_KEY_EXCHANGE__CERT_REQ_ALLOWED__ENABLED) -static int ssl_write_certificate_verify( mbedtls_ssl_context *ssl ) -{ - const mbedtls_ssl_ciphersuite_t *ciphersuite_info = - ssl->handshake->ciphersuite_info; - int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> write certificate verify" ) ); - - if( ( ret = mbedtls_ssl_derive_keys( ssl ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_derive_keys", ret ); - return( ret ); - } - - if( !mbedtls_ssl_ciphersuite_cert_req_allowed( ciphersuite_info ) ) - { - MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= skip write certificate verify" ) ); - ssl->state++; - return( 0 ); - } - - MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) ); - return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); -} -#else /* !MBEDTLS_KEY_EXCHANGE__CERT_REQ_ALLOWED__ENABLED */ -static int ssl_write_certificate_verify( mbedtls_ssl_context *ssl ) -{ - int ret = MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE; - const mbedtls_ssl_ciphersuite_t *ciphersuite_info = - ssl->handshake->ciphersuite_info; - size_t n = 0, offset = 0; - unsigned char hash[48]; - unsigned char *hash_start = hash; - mbedtls_md_type_t md_alg = MBEDTLS_MD_NONE; - size_t hashlen; - void *rs_ctx = NULL; - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> write certificate verify" ) ); - -#if defined(MBEDTLS_SSL__ECP_RESTARTABLE) - if( ssl->handshake->ecrs_enabled && - ssl->handshake->ecrs_state == ssl_ecrs_crt_vrfy_sign ) - { - goto sign; - } -#endif - - if( ( ret = mbedtls_ssl_derive_keys( ssl ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_derive_keys", ret ); - return( ret ); - } - - if( !mbedtls_ssl_ciphersuite_cert_req_allowed( ciphersuite_info ) ) - { - MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= skip write certificate verify" ) ); - ssl->state++; - return( 0 ); - } - - if( ssl->client_auth == 0 || mbedtls_ssl_own_cert( ssl ) == NULL ) - { - MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= skip write certificate verify" ) ); - ssl->state++; - return( 0 ); - } - - if( mbedtls_ssl_own_key( ssl ) == NULL ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "got no private key for certificate" ) ); - return( MBEDTLS_ERR_SSL_PRIVATE_KEY_REQUIRED ); - } - - /* - * Make a signature of the handshake digests - */ -#if defined(MBEDTLS_SSL__ECP_RESTARTABLE) - if( ssl->handshake->ecrs_enabled ) - ssl->handshake->ecrs_state = ssl_ecrs_crt_vrfy_sign; - -sign: -#endif - - ssl->handshake->calc_verify( ssl, hash, &hashlen ); - -#if defined(MBEDTLS_SSL_PROTO_SSL3) || defined(MBEDTLS_SSL_PROTO_TLS1) || \ - defined(MBEDTLS_SSL_PROTO_TLS1_1) - if( ssl->minor_ver != MBEDTLS_SSL_MINOR_VERSION_3 ) - { - /* - * digitally-signed struct { - * opaque md5_hash[16]; - * opaque sha_hash[20]; - * }; - * - * md5_hash - * MD5(handshake_messages); - * - * sha_hash - * SHA(handshake_messages); - */ - md_alg = MBEDTLS_MD_NONE; - - /* - * For ECDSA, default hash is SHA-1 only - */ - if( mbedtls_pk_can_do( mbedtls_ssl_own_key( ssl ), MBEDTLS_PK_ECDSA ) ) - { - hash_start += 16; - hashlen -= 16; - md_alg = MBEDTLS_MD_SHA1; - } - } - else -#endif /* MBEDTLS_SSL_PROTO_SSL3 || MBEDTLS_SSL_PROTO_TLS1 || \ - MBEDTLS_SSL_PROTO_TLS1_1 */ -#if defined(MBEDTLS_SSL_PROTO_TLS1_2) - if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_3 ) - { - /* - * digitally-signed struct { - * opaque handshake_messages[handshake_messages_length]; - * }; - * - * Taking shortcut here. We assume that the server always allows the - * PRF Hash function and has sent it in the allowed signature - * algorithms list received in the Certificate Request message. - * - * Until we encounter a server that does not, we will take this - * shortcut. - * - * Reason: Otherwise we should have running hashes for SHA512 and SHA224 - * in order to satisfy 'weird' needs from the server side. - */ - if( ssl->handshake->ciphersuite_info->mac == MBEDTLS_MD_SHA384 ) - { - md_alg = MBEDTLS_MD_SHA384; - ssl->out_msg[4] = MBEDTLS_SSL_HASH_SHA384; - } - else - { - md_alg = MBEDTLS_MD_SHA256; - ssl->out_msg[4] = MBEDTLS_SSL_HASH_SHA256; - } - ssl->out_msg[5] = mbedtls_ssl_sig_from_pk( mbedtls_ssl_own_key( ssl ) ); - - /* Info from md_alg will be used instead */ - hashlen = 0; - offset = 2; - } - else -#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */ - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) ); - return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); - } - -#if defined(MBEDTLS_SSL__ECP_RESTARTABLE) - if( ssl->handshake->ecrs_enabled ) - rs_ctx = &ssl->handshake->ecrs_ctx.pk; -#endif - - if( ( ret = mbedtls_pk_sign_restartable( mbedtls_ssl_own_key( ssl ), - md_alg, hash_start, hashlen, - ssl->out_msg + 6 + offset, &n, - ssl->conf->f_rng, ssl->conf->p_rng, rs_ctx ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_pk_sign", ret ); -#if defined(MBEDTLS_SSL__ECP_RESTARTABLE) - if( ret == MBEDTLS_ERR_ECP_IN_PROGRESS ) - ret = MBEDTLS_ERR_SSL_CRYPTO_IN_PROGRESS; -#endif - return( ret ); - } - - ssl->out_msg[4 + offset] = (unsigned char)( n >> 8 ); - ssl->out_msg[5 + offset] = (unsigned char)( n ); - - ssl->out_msglen = 6 + n + offset; - ssl->out_msgtype = MBEDTLS_SSL_MSG_HANDSHAKE; - ssl->out_msg[0] = MBEDTLS_SSL_HS_CERTIFICATE_VERIFY; - - ssl->state++; - - if( ( ret = mbedtls_ssl_write_handshake_msg( ssl ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_write_handshake_msg", ret ); - return( ret ); - } - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= write certificate verify" ) ); - - return( ret ); -} -#endif /* MBEDTLS_KEY_EXCHANGE__CERT_REQ_ALLOWED__ENABLED */ - -#if defined(MBEDTLS_SSL_SESSION_TICKETS) -static int ssl_parse_new_session_ticket( mbedtls_ssl_context *ssl ) -{ - int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; - uint32_t lifetime; - size_t ticket_len; - unsigned char *ticket; - const unsigned char *msg; - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> parse new session ticket" ) ); - - if( ( ret = mbedtls_ssl_read_record( ssl, 1 ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_read_record", ret ); - return( ret ); - } - - if( ssl->in_msgtype != MBEDTLS_SSL_MSG_HANDSHAKE ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad new session ticket message" ) ); - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_UNEXPECTED_MESSAGE ); - return( MBEDTLS_ERR_SSL_UNEXPECTED_MESSAGE ); - } - - /* - * struct { - * uint32 ticket_lifetime_hint; - * opaque ticket<0..2^16-1>; - * } NewSessionTicket; - * - * 0 . 3 ticket_lifetime_hint - * 4 . 5 ticket_len (n) - * 6 . 5+n ticket content - */ - if( ssl->in_msg[0] != MBEDTLS_SSL_HS_NEW_SESSION_TICKET || - ssl->in_hslen < 6 + mbedtls_ssl_hs_hdr_len( ssl ) ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad new session ticket message" ) ); - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR ); - return( MBEDTLS_ERR_SSL_BAD_HS_NEW_SESSION_TICKET ); - } - - msg = ssl->in_msg + mbedtls_ssl_hs_hdr_len( ssl ); - - lifetime = ( ((uint32_t) msg[0]) << 24 ) | ( msg[1] << 16 ) | - ( msg[2] << 8 ) | ( msg[3] ); - - ticket_len = ( msg[4] << 8 ) | ( msg[5] ); - - if( ticket_len + 6 + mbedtls_ssl_hs_hdr_len( ssl ) != ssl->in_hslen ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad new session ticket message" ) ); - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR ); - return( MBEDTLS_ERR_SSL_BAD_HS_NEW_SESSION_TICKET ); - } - - MBEDTLS_SSL_DEBUG_MSG( 3, ( "ticket length: %d", ticket_len ) ); - - /* We're not waiting for a NewSessionTicket message any more */ - ssl->handshake->new_session_ticket = 0; - ssl->state = MBEDTLS_SSL_SERVER_CHANGE_CIPHER_SPEC; - - /* - * Zero-length ticket means the server changed his mind and doesn't want - * to send a ticket after all, so just forget it - */ - if( ticket_len == 0 ) - return( 0 ); - - if( ssl->session != NULL && ssl->session->ticket != NULL ) - { - mbedtls_platform_zeroize( ssl->session->ticket, - ssl->session->ticket_len ); - mbedtls_free( ssl->session->ticket ); - ssl->session->ticket = NULL; - ssl->session->ticket_len = 0; - } - - mbedtls_platform_zeroize( ssl->session_negotiate->ticket, - ssl->session_negotiate->ticket_len ); - mbedtls_free( ssl->session_negotiate->ticket ); - ssl->session_negotiate->ticket = NULL; - ssl->session_negotiate->ticket_len = 0; - - if( ( ticket = mbedtls_calloc( 1, ticket_len ) ) == NULL ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "ticket alloc failed" ) ); - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_INTERNAL_ERROR ); - return( MBEDTLS_ERR_SSL_ALLOC_FAILED ); - } - - memcpy( ticket, msg + 6, ticket_len ); - - ssl->session_negotiate->ticket = ticket; - ssl->session_negotiate->ticket_len = ticket_len; - ssl->session_negotiate->ticket_lifetime = lifetime; - - /* - * RFC 5077 section 3.4: - * "If the client receives a session ticket from the server, then it - * discards any Session ID that was sent in the ServerHello." - */ - MBEDTLS_SSL_DEBUG_MSG( 3, ( "ticket in use, discarding session id" ) ); - ssl->session_negotiate->id_len = 0; - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= parse new session ticket" ) ); - - return( 0 ); -} -#endif /* MBEDTLS_SSL_SESSION_TICKETS */ - -/* - * SSL handshake -- client side -- single step - */ -int mbedtls_ssl_handshake_client_step( mbedtls_ssl_context *ssl ) -{ - int ret = 0; - - if( ssl->state == MBEDTLS_SSL_HANDSHAKE_OVER || ssl->handshake == NULL ) - return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "client state: %d", ssl->state ) ); - - if( ( ret = mbedtls_ssl_flush_output( ssl ) ) != 0 ) - return( ret ); - -#if defined(MBEDTLS_SSL_PROTO_DTLS) - if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM && - ssl->handshake->retransmit_state == MBEDTLS_SSL_RETRANS_SENDING ) - { - if( ( ret = mbedtls_ssl_flight_transmit( ssl ) ) != 0 ) - return( ret ); - } -#endif /* MBEDTLS_SSL_PROTO_DTLS */ - - /* Change state now, so that it is right in mbedtls_ssl_read_record(), used - * by DTLS for dropping out-of-sequence ChangeCipherSpec records */ -#if defined(MBEDTLS_SSL_SESSION_TICKETS) - if( ssl->state == MBEDTLS_SSL_SERVER_CHANGE_CIPHER_SPEC && - ssl->handshake->new_session_ticket != 0 ) - { - ssl->state = MBEDTLS_SSL_SERVER_NEW_SESSION_TICKET; - } -#endif - - switch( ssl->state ) - { - case MBEDTLS_SSL_HELLO_REQUEST: - ssl->state = MBEDTLS_SSL_CLIENT_HELLO; - break; - - /* - * ==> ClientHello - */ - case MBEDTLS_SSL_CLIENT_HELLO: - ret = ssl_write_client_hello( ssl ); - break; - - /* - * <== ServerHello - * Certificate - * ( ServerKeyExchange ) - * ( CertificateRequest ) - * ServerHelloDone - */ - case MBEDTLS_SSL_SERVER_HELLO: - ret = ssl_parse_server_hello( ssl ); - break; - - case MBEDTLS_SSL_SERVER_CERTIFICATE: - ret = mbedtls_ssl_parse_certificate( ssl ); - break; - - case MBEDTLS_SSL_SERVER_KEY_EXCHANGE: - ret = ssl_parse_server_key_exchange( ssl ); - break; - - case MBEDTLS_SSL_CERTIFICATE_REQUEST: - ret = ssl_parse_certificate_request( ssl ); - break; - - case MBEDTLS_SSL_SERVER_HELLO_DONE: - ret = ssl_parse_server_hello_done( ssl ); - break; - - /* - * ==> ( Certificate/Alert ) - * ClientKeyExchange - * ( CertificateVerify ) - * ChangeCipherSpec - * Finished - */ - case MBEDTLS_SSL_CLIENT_CERTIFICATE: - ret = mbedtls_ssl_write_certificate( ssl ); - break; - - case MBEDTLS_SSL_CLIENT_KEY_EXCHANGE: - ret = ssl_write_client_key_exchange( ssl ); - break; - - case MBEDTLS_SSL_CERTIFICATE_VERIFY: - ret = ssl_write_certificate_verify( ssl ); - break; - - case MBEDTLS_SSL_CLIENT_CHANGE_CIPHER_SPEC: - ret = mbedtls_ssl_write_change_cipher_spec( ssl ); - break; - - case MBEDTLS_SSL_CLIENT_FINISHED: - ret = mbedtls_ssl_write_finished( ssl ); - break; - - /* - * <== ( NewSessionTicket ) - * ChangeCipherSpec - * Finished - */ -#if defined(MBEDTLS_SSL_SESSION_TICKETS) - case MBEDTLS_SSL_SERVER_NEW_SESSION_TICKET: - ret = ssl_parse_new_session_ticket( ssl ); - break; -#endif - - case MBEDTLS_SSL_SERVER_CHANGE_CIPHER_SPEC: - ret = mbedtls_ssl_parse_change_cipher_spec( ssl ); - break; - - case MBEDTLS_SSL_SERVER_FINISHED: - ret = mbedtls_ssl_parse_finished( ssl ); - break; - - case MBEDTLS_SSL_FLUSH_BUFFERS: - MBEDTLS_SSL_DEBUG_MSG( 2, ( "handshake: done" ) ); - ssl->state = MBEDTLS_SSL_HANDSHAKE_WRAPUP; - break; - - case MBEDTLS_SSL_HANDSHAKE_WRAPUP: - mbedtls_ssl_handshake_wrapup( ssl ); - break; - - default: - MBEDTLS_SSL_DEBUG_MSG( 1, ( "invalid state %d", ssl->state ) ); - return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); - } - - return( ret ); -} #endif /* MBEDTLS_SSL_CLI_C */ diff --git a/library/ssl_msg.c b/library/ssl_msg.c index f4bd34997..b9c249e10 100644 --- a/library/ssl_msg.c +++ b/library/ssl_msg.c @@ -458,6 +458,51 @@ static void ssl_extract_add_data_from_record( unsigned char* add_data, } } +#if defined(MBEDTLS_SSL_PROTO_SSL3) +/* + * SSLv3.0 MAC functions + */ +#define SSL_MAC_MAX_BYTES 20 /* MD-5 or SHA-1 */ +static void ssl_mac( mbedtls_md_context_t *md_ctx, + const unsigned char *secret, + const unsigned char *buf, size_t len, + const unsigned char *ctr, int type, + unsigned char out[SSL_MAC_MAX_BYTES] ) +{ + unsigned char header[11]; + unsigned char padding[48]; + int padlen; + int md_size = mbedtls_md_get_size( md_ctx->md_info ); + int md_type = mbedtls_md_get_type( md_ctx->md_info ); + + /* Only MD5 and SHA-1 supported */ + if( md_type == MBEDTLS_MD_MD5 ) + padlen = 48; + else + padlen = 40; + + memcpy( header, ctr, 8 ); + header[ 8] = (unsigned char) type; + header[ 9] = (unsigned char)( len >> 8 ); + header[10] = (unsigned char)( len ); + + memset( padding, 0x36, padlen ); + mbedtls_md_starts( md_ctx ); + mbedtls_md_update( md_ctx, secret, md_size ); + mbedtls_md_update( md_ctx, padding, padlen ); + mbedtls_md_update( md_ctx, header, 11 ); + mbedtls_md_update( md_ctx, buf, len ); + mbedtls_md_finish( md_ctx, out ); + + memset( padding, 0x5C, padlen ); + mbedtls_md_starts( md_ctx ); + mbedtls_md_update( md_ctx, secret, md_size ); + mbedtls_md_update( md_ctx, padding, padlen ); + mbedtls_md_update( md_ctx, out, md_size ); + mbedtls_md_finish( md_ctx, out ); +} +#endif /* MBEDTLS_SSL_PROTO_SSL3 */ + int mbedtls_ssl_encrypt_buf( mbedtls_ssl_context *ssl, mbedtls_ssl_transform *transform, mbedtls_record *rec, diff --git a/library/ssl_srv.c b/library/ssl_srv.c index b0b09cd97..a38ce9049 100644 --- a/library/ssl_srv.c +++ b/library/ssl_srv.c @@ -81,4497 +81,4 @@ void mbedtls_ssl_conf_dtls_cookies( mbedtls_ssl_config *conf, } #endif /* MBEDTLS_SSL_DTLS_HELLO_VERIFY */ -#if defined(MBEDTLS_SSL_SERVER_NAME_INDICATION) -static int ssl_parse_servername_ext( mbedtls_ssl_context *ssl, - const unsigned char *buf, - size_t len ) -{ - int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; - size_t servername_list_size, hostname_len; - const unsigned char *p; - - MBEDTLS_SSL_DEBUG_MSG( 3, ( "parse ServerName extension" ) ); - - if( len < 2 ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) ); - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR ); - return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO ); - } - servername_list_size = ( ( buf[0] << 8 ) | ( buf[1] ) ); - if( servername_list_size + 2 != len ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) ); - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR ); - return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO ); - } - - p = buf + 2; - while( servername_list_size > 2 ) - { - hostname_len = ( ( p[1] << 8 ) | p[2] ); - if( hostname_len + 3 > servername_list_size ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) ); - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR ); - return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO ); - } - - if( p[0] == MBEDTLS_TLS_EXT_SERVERNAME_HOSTNAME ) - { - ret = ssl->conf->f_sni( ssl->conf->p_sni, - ssl, p + 3, hostname_len ); - if( ret != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "ssl_sni_wrapper", ret ); - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_UNRECOGNIZED_NAME ); - return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO ); - } - return( 0 ); - } - - servername_list_size -= hostname_len + 3; - p += hostname_len + 3; - } - - if( servername_list_size != 0 ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) ); - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_ILLEGAL_PARAMETER ); - return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO ); - } - - return( 0 ); -} -#endif /* MBEDTLS_SSL_SERVER_NAME_INDICATION */ - -#if defined(MBEDTLS_KEY_EXCHANGE__SOME__PSK_ENABLED) -static int ssl_conf_has_psk_or_cb( mbedtls_ssl_config const *conf ) -{ - if( conf->f_psk != NULL ) - return( 1 ); - - if( conf->psk_identity_len == 0 || conf->psk_identity == NULL ) - return( 0 ); - - if( conf->psk != NULL && conf->psk_len != 0 ) - return( 1 ); - -#if defined(MBEDTLS_USE_PSA_CRYPTO) - if( conf->psk_opaque != 0 ) - return( 1 ); -#endif /* MBEDTLS_USE_PSA_CRYPTO */ - - return( 0 ); -} - -#if defined(MBEDTLS_USE_PSA_CRYPTO) -static int ssl_use_opaque_psk( mbedtls_ssl_context const *ssl ) -{ - if( ssl->conf->f_psk != NULL ) - { - /* If we've used a callback to select the PSK, - * the static configuration is irrelevant. */ - - if( ssl->handshake->psk_opaque != 0 ) - return( 1 ); - - return( 0 ); - } - - if( ssl->conf->psk_opaque != 0 ) - return( 1 ); - - return( 0 ); -} -#endif /* MBEDTLS_USE_PSA_CRYPTO */ -#endif /* MBEDTLS_KEY_EXCHANGE__SOME__PSK_ENABLED */ - -static int ssl_parse_renegotiation_info( mbedtls_ssl_context *ssl, - const unsigned char *buf, - size_t len ) -{ -#if defined(MBEDTLS_SSL_RENEGOTIATION) - if( ssl->renego_status != MBEDTLS_SSL_INITIAL_HANDSHAKE ) - { - /* Check verify-data in constant-time. The length OTOH is no secret */ - if( len != 1 + ssl->verify_data_len || - buf[0] != ssl->verify_data_len || - mbedtls_ssl_safer_memcmp( buf + 1, ssl->peer_verify_data, - ssl->verify_data_len ) != 0 ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "non-matching renegotiation info" ) ); - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE ); - return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO ); - } - } - else -#endif /* MBEDTLS_SSL_RENEGOTIATION */ - { - if( len != 1 || buf[0] != 0x0 ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "non-zero length renegotiation info" ) ); - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE ); - return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO ); - } - - ssl->secure_renegotiation = MBEDTLS_SSL_SECURE_RENEGOTIATION; - } - - return( 0 ); -} - -#if defined(MBEDTLS_SSL_PROTO_TLS1_2) && \ - defined(MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED) - -/* - * Status of the implementation of signature-algorithms extension: - * - * Currently, we are only considering the signature-algorithm extension - * to pick a ciphersuite which allows us to send the ServerKeyExchange - * message with a signature-hash combination that the user allows. - * - * We do *not* check whether all certificates in our certificate - * chain are signed with an allowed signature-hash pair. - * This needs to be done at a later stage. - * - */ -static int ssl_parse_signature_algorithms_ext( mbedtls_ssl_context *ssl, - const unsigned char *buf, - size_t len ) -{ - size_t sig_alg_list_size; - - const unsigned char *p; - const unsigned char *end = buf + len; - - mbedtls_md_type_t md_cur; - mbedtls_pk_type_t sig_cur; - - if ( len < 2 ) { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) ); - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR ); - return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO ); - } - sig_alg_list_size = ( ( buf[0] << 8 ) | ( buf[1] ) ); - if( sig_alg_list_size + 2 != len || - sig_alg_list_size % 2 != 0 ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) ); - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR ); - return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO ); - } - - /* Currently we only guarantee signing the ServerKeyExchange message according - * to the constraints specified in this extension (see above), so it suffices - * to remember only one suitable hash for each possible signature algorithm. - * - * This will change when we also consider certificate signatures, - * in which case we will need to remember the whole signature-hash - * pair list from the extension. - */ - - for( p = buf + 2; p < end; p += 2 ) - { - /* Silently ignore unknown signature or hash algorithms. */ - - if( ( sig_cur = mbedtls_ssl_pk_alg_from_sig( p[1] ) ) == MBEDTLS_PK_NONE ) - { - MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello v3, signature_algorithm ext" - " unknown sig alg encoding %d", p[1] ) ); - continue; - } - - /* Check if we support the hash the user proposes */ - md_cur = mbedtls_ssl_md_alg_from_hash( p[0] ); - if( md_cur == MBEDTLS_MD_NONE ) - { - MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello v3, signature_algorithm ext:" - " unknown hash alg encoding %d", p[0] ) ); - continue; - } - - if( mbedtls_ssl_check_sig_hash( ssl, md_cur ) == 0 ) - { - mbedtls_ssl_sig_hash_set_add( &ssl->handshake->hash_algs, sig_cur, md_cur ); - MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello v3, signature_algorithm ext:" - " match sig %d and hash %d", - sig_cur, md_cur ) ); - } - else - { - MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello v3, signature_algorithm ext: " - "hash alg %d not supported", md_cur ) ); - } - } - - return( 0 ); -} -#endif /* MBEDTLS_SSL_PROTO_TLS1_2 && - MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED */ - -#if defined(MBEDTLS_ECDH_C) || defined(MBEDTLS_ECDSA_C) || \ - defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED) -static int ssl_parse_supported_elliptic_curves( mbedtls_ssl_context *ssl, - const unsigned char *buf, - size_t len ) -{ - size_t list_size, our_size; - const unsigned char *p; - const mbedtls_ecp_curve_info *curve_info, **curves; - - if ( len < 2 ) { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) ); - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR ); - return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO ); - } - list_size = ( ( buf[0] << 8 ) | ( buf[1] ) ); - if( list_size + 2 != len || - list_size % 2 != 0 ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) ); - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR ); - return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO ); - } - - /* Should never happen unless client duplicates the extension */ - if( ssl->handshake->curves != NULL ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) ); - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR ); - return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO ); - } - - /* Don't allow our peer to make us allocate too much memory, - * and leave room for a final 0 */ - our_size = list_size / 2 + 1; - if( our_size > MBEDTLS_ECP_DP_MAX ) - our_size = MBEDTLS_ECP_DP_MAX; - - if( ( curves = mbedtls_calloc( our_size, sizeof( *curves ) ) ) == NULL ) - { - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_INTERNAL_ERROR ); - return( MBEDTLS_ERR_SSL_ALLOC_FAILED ); - } - - ssl->handshake->curves = curves; - - p = buf + 2; - while( list_size > 0 && our_size > 1 ) - { - curve_info = mbedtls_ecp_curve_info_from_tls_id( ( p[0] << 8 ) | p[1] ); - - if( curve_info != NULL ) - { - *curves++ = curve_info; - our_size--; - } - - list_size -= 2; - p += 2; - } - - return( 0 ); -} - -static int ssl_parse_supported_point_formats( mbedtls_ssl_context *ssl, - const unsigned char *buf, - size_t len ) -{ - size_t list_size; - const unsigned char *p; - - if( len == 0 || (size_t)( buf[0] + 1 ) != len ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) ); - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR ); - return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO ); - } - list_size = buf[0]; - - p = buf + 1; - while( list_size > 0 ) - { - if( p[0] == MBEDTLS_ECP_PF_UNCOMPRESSED || - p[0] == MBEDTLS_ECP_PF_COMPRESSED ) - { -#if defined(MBEDTLS_ECDH_C) || defined(MBEDTLS_ECDSA_C) - ssl->handshake->ecdh_ctx.point_format = p[0]; -#endif -#if defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED) - ssl->handshake->ecjpake_ctx.point_format = p[0]; -#endif - MBEDTLS_SSL_DEBUG_MSG( 4, ( "point format selected: %d", p[0] ) ); - return( 0 ); - } - - list_size--; - p++; - } - - return( 0 ); -} -#endif /* MBEDTLS_ECDH_C || MBEDTLS_ECDSA_C || - MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED */ - -#if defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED) -static int ssl_parse_ecjpake_kkpp( mbedtls_ssl_context *ssl, - const unsigned char *buf, - size_t len ) -{ - int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; - - if( mbedtls_ecjpake_check( &ssl->handshake->ecjpake_ctx ) != 0 ) - { - MBEDTLS_SSL_DEBUG_MSG( 3, ( "skip ecjpake kkpp extension" ) ); - return( 0 ); - } - - if( ( ret = mbedtls_ecjpake_read_round_one( &ssl->handshake->ecjpake_ctx, - buf, len ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ecjpake_read_round_one", ret ); - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_ILLEGAL_PARAMETER ); - return( ret ); - } - - /* Only mark the extension as OK when we're sure it is */ - ssl->handshake->cli_exts |= MBEDTLS_TLS_EXT_ECJPAKE_KKPP_OK; - - return( 0 ); -} -#endif /* MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED */ - -#if defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH) -static int ssl_parse_max_fragment_length_ext( mbedtls_ssl_context *ssl, - const unsigned char *buf, - size_t len ) -{ - if( len != 1 || buf[0] >= MBEDTLS_SSL_MAX_FRAG_LEN_INVALID ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) ); - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_ILLEGAL_PARAMETER ); - return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO ); - } - - ssl->session_negotiate->mfl_code = buf[0]; - - return( 0 ); -} -#endif /* MBEDTLS_SSL_MAX_FRAGMENT_LENGTH */ - -#if defined(MBEDTLS_SSL_DTLS_CONNECTION_ID) -static int ssl_parse_cid_ext( mbedtls_ssl_context *ssl, - const unsigned char *buf, - size_t len ) -{ - size_t peer_cid_len; - - /* CID extension only makes sense in DTLS */ - if( ssl->conf->transport != MBEDTLS_SSL_TRANSPORT_DATAGRAM ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) ); - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_ILLEGAL_PARAMETER ); - return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO ); - } - - /* - * Quoting draft-ietf-tls-dtls-connection-id-05 - * https://tools.ietf.org/html/draft-ietf-tls-dtls-connection-id-05 - * - * struct { - * opaque cid<0..2^8-1>; - * } ConnectionId; - */ - - if( len < 1 ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) ); - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_ILLEGAL_PARAMETER ); - return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO ); - } - - peer_cid_len = *buf++; - len--; - - if( len != peer_cid_len ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) ); - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_ILLEGAL_PARAMETER ); - return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO ); - } - - /* Ignore CID if the user has disabled its use. */ - if( ssl->negotiate_cid == MBEDTLS_SSL_CID_DISABLED ) - { - /* Leave ssl->handshake->cid_in_use in its default - * value of MBEDTLS_SSL_CID_DISABLED. */ - MBEDTLS_SSL_DEBUG_MSG( 3, ( "Client sent CID extension, but CID disabled" ) ); - return( 0 ); - } - - if( peer_cid_len > MBEDTLS_SSL_CID_OUT_LEN_MAX ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) ); - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_ILLEGAL_PARAMETER ); - return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO ); - } - - ssl->handshake->cid_in_use = MBEDTLS_SSL_CID_ENABLED; - ssl->handshake->peer_cid_len = (uint8_t) peer_cid_len; - memcpy( ssl->handshake->peer_cid, buf, peer_cid_len ); - - MBEDTLS_SSL_DEBUG_MSG( 3, ( "Use of CID extension negotiated" ) ); - MBEDTLS_SSL_DEBUG_BUF( 3, "Client CID", buf, peer_cid_len ); - - return( 0 ); -} -#endif /* MBEDTLS_SSL_DTLS_CONNECTION_ID */ - -#if defined(MBEDTLS_SSL_TRUNCATED_HMAC) -static int ssl_parse_truncated_hmac_ext( mbedtls_ssl_context *ssl, - const unsigned char *buf, - size_t len ) -{ - if( len != 0 ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) ); - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR ); - return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO ); - } - - ((void) buf); - - if( ssl->conf->trunc_hmac == MBEDTLS_SSL_TRUNC_HMAC_ENABLED ) - ssl->session_negotiate->trunc_hmac = MBEDTLS_SSL_TRUNC_HMAC_ENABLED; - - return( 0 ); -} -#endif /* MBEDTLS_SSL_TRUNCATED_HMAC */ - -#if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC) -static int ssl_parse_encrypt_then_mac_ext( mbedtls_ssl_context *ssl, - const unsigned char *buf, - size_t len ) -{ - if( len != 0 ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) ); - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR ); - return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO ); - } - - ((void) buf); - - if( ssl->conf->encrypt_then_mac == MBEDTLS_SSL_ETM_ENABLED && - ssl->minor_ver != MBEDTLS_SSL_MINOR_VERSION_0 ) - { - ssl->session_negotiate->encrypt_then_mac = MBEDTLS_SSL_ETM_ENABLED; - } - - return( 0 ); -} -#endif /* MBEDTLS_SSL_ENCRYPT_THEN_MAC */ - -#if defined(MBEDTLS_SSL_EXTENDED_MASTER_SECRET) -static int ssl_parse_extended_ms_ext( mbedtls_ssl_context *ssl, - const unsigned char *buf, - size_t len ) -{ - if( len != 0 ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) ); - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR ); - return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO ); - } - - ((void) buf); - - if( ssl->conf->extended_ms == MBEDTLS_SSL_EXTENDED_MS_ENABLED && - ssl->minor_ver != MBEDTLS_SSL_MINOR_VERSION_0 ) - { - ssl->handshake->extended_ms = MBEDTLS_SSL_EXTENDED_MS_ENABLED; - } - - return( 0 ); -} -#endif /* MBEDTLS_SSL_EXTENDED_MASTER_SECRET */ - -#if defined(MBEDTLS_SSL_SESSION_TICKETS) -static int ssl_parse_session_ticket_ext( mbedtls_ssl_context *ssl, - unsigned char *buf, - size_t len ) -{ - int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; - mbedtls_ssl_session session; - - mbedtls_ssl_session_init( &session ); - - if( ssl->conf->f_ticket_parse == NULL || - ssl->conf->f_ticket_write == NULL ) - { - return( 0 ); - } - - /* Remember the client asked us to send a new ticket */ - ssl->handshake->new_session_ticket = 1; - - MBEDTLS_SSL_DEBUG_MSG( 3, ( "ticket length: %d", len ) ); - - if( len == 0 ) - return( 0 ); - -#if defined(MBEDTLS_SSL_RENEGOTIATION) - if( ssl->renego_status != MBEDTLS_SSL_INITIAL_HANDSHAKE ) - { - MBEDTLS_SSL_DEBUG_MSG( 3, ( "ticket rejected: renegotiating" ) ); - return( 0 ); - } -#endif /* MBEDTLS_SSL_RENEGOTIATION */ - - /* - * Failures are ok: just ignore the ticket and proceed. - */ - if( ( ret = ssl->conf->f_ticket_parse( ssl->conf->p_ticket, &session, - buf, len ) ) != 0 ) - { - mbedtls_ssl_session_free( &session ); - - if( ret == MBEDTLS_ERR_SSL_INVALID_MAC ) - MBEDTLS_SSL_DEBUG_MSG( 3, ( "ticket is not authentic" ) ); - else if( ret == MBEDTLS_ERR_SSL_SESSION_TICKET_EXPIRED ) - MBEDTLS_SSL_DEBUG_MSG( 3, ( "ticket is expired" ) ); - else - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_ticket_parse", ret ); - - return( 0 ); - } - - /* - * Keep the session ID sent by the client, since we MUST send it back to - * inform them we're accepting the ticket (RFC 5077 section 3.4) - */ - session.id_len = ssl->session_negotiate->id_len; - memcpy( &session.id, ssl->session_negotiate->id, session.id_len ); - - mbedtls_ssl_session_free( ssl->session_negotiate ); - memcpy( ssl->session_negotiate, &session, sizeof( mbedtls_ssl_session ) ); - - /* Zeroize instead of free as we copied the content */ - mbedtls_platform_zeroize( &session, sizeof( mbedtls_ssl_session ) ); - - MBEDTLS_SSL_DEBUG_MSG( 3, ( "session successfully restored from ticket" ) ); - - ssl->handshake->resume = 1; - - /* Don't send a new ticket after all, this one is OK */ - ssl->handshake->new_session_ticket = 0; - - return( 0 ); -} -#endif /* MBEDTLS_SSL_SESSION_TICKETS */ - -#if defined(MBEDTLS_SSL_ALPN) -static int ssl_parse_alpn_ext( mbedtls_ssl_context *ssl, - const unsigned char *buf, size_t len ) -{ - size_t list_len, cur_len, ours_len; - const unsigned char *theirs, *start, *end; - const char **ours; - - /* If ALPN not configured, just ignore the extension */ - if( ssl->conf->alpn_list == NULL ) - return( 0 ); - - /* - * opaque ProtocolName<1..2^8-1>; - * - * struct { - * ProtocolName protocol_name_list<2..2^16-1> - * } ProtocolNameList; - */ - - /* Min length is 2 (list_len) + 1 (name_len) + 1 (name) */ - if( len < 4 ) - { - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR ); - return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO ); - } - - list_len = ( buf[0] << 8 ) | buf[1]; - if( list_len != len - 2 ) - { - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR ); - return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO ); - } - - /* - * Validate peer's list (lengths) - */ - start = buf + 2; - end = buf + len; - for( theirs = start; theirs != end; theirs += cur_len ) - { - cur_len = *theirs++; - - /* Current identifier must fit in list */ - if( cur_len > (size_t)( end - theirs ) ) - { - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR ); - return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO ); - } - - /* Empty strings MUST NOT be included */ - if( cur_len == 0 ) - { - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_ILLEGAL_PARAMETER ); - return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO ); - } - } - - /* - * Use our order of preference - */ - for( ours = ssl->conf->alpn_list; *ours != NULL; ours++ ) - { - ours_len = strlen( *ours ); - for( theirs = start; theirs != end; theirs += cur_len ) - { - cur_len = *theirs++; - - if( cur_len == ours_len && - memcmp( theirs, *ours, cur_len ) == 0 ) - { - ssl->alpn_chosen = *ours; - return( 0 ); - } - } - } - - /* If we get there, no match was found */ - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_NO_APPLICATION_PROTOCOL ); - return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO ); -} -#endif /* MBEDTLS_SSL_ALPN */ - -/* - * Auxiliary functions for ServerHello parsing and related actions - */ - -#if defined(MBEDTLS_X509_CRT_PARSE_C) -/* - * Return 0 if the given key uses one of the acceptable curves, -1 otherwise - */ -#if defined(MBEDTLS_ECDSA_C) -static int ssl_check_key_curve( mbedtls_pk_context *pk, - const mbedtls_ecp_curve_info **curves ) -{ - const mbedtls_ecp_curve_info **crv = curves; - mbedtls_ecp_group_id grp_id = mbedtls_pk_ec( *pk )->grp.id; - - while( *crv != NULL ) - { - if( (*crv)->grp_id == grp_id ) - return( 0 ); - crv++; - } - - return( -1 ); -} -#endif /* MBEDTLS_ECDSA_C */ - -/* - * Try picking a certificate for this ciphersuite, - * return 0 on success and -1 on failure. - */ -static int ssl_pick_cert( mbedtls_ssl_context *ssl, - const mbedtls_ssl_ciphersuite_t * ciphersuite_info ) -{ - mbedtls_ssl_key_cert *cur, *list, *fallback = NULL; - mbedtls_pk_type_t pk_alg = - mbedtls_ssl_get_ciphersuite_sig_pk_alg( ciphersuite_info ); - uint32_t flags; - -#if defined(MBEDTLS_SSL_SERVER_NAME_INDICATION) - if( ssl->handshake->sni_key_cert != NULL ) - list = ssl->handshake->sni_key_cert; - else -#endif - list = ssl->conf->key_cert; - - if( pk_alg == MBEDTLS_PK_NONE ) - return( 0 ); - - MBEDTLS_SSL_DEBUG_MSG( 3, ( "ciphersuite requires certificate" ) ); - - if( list == NULL ) - { - MBEDTLS_SSL_DEBUG_MSG( 3, ( "server has no certificate" ) ); - return( -1 ); - } - - for( cur = list; cur != NULL; cur = cur->next ) - { - MBEDTLS_SSL_DEBUG_CRT( 3, "candidate certificate chain, certificate", - cur->cert ); - - if( ! mbedtls_pk_can_do( &cur->cert->pk, pk_alg ) ) - { - MBEDTLS_SSL_DEBUG_MSG( 3, ( "certificate mismatch: key type" ) ); - continue; - } - - /* - * This avoids sending the client a cert it'll reject based on - * keyUsage or other extensions. - * - * It also allows the user to provision different certificates for - * different uses based on keyUsage, eg if they want to avoid signing - * and decrypting with the same RSA key. - */ - if( mbedtls_ssl_check_cert_usage( cur->cert, ciphersuite_info, - MBEDTLS_SSL_IS_SERVER, &flags ) != 0 ) - { - MBEDTLS_SSL_DEBUG_MSG( 3, ( "certificate mismatch: " - "(extended) key usage extension" ) ); - continue; - } - -#if defined(MBEDTLS_ECDSA_C) - if( pk_alg == MBEDTLS_PK_ECDSA && - ssl_check_key_curve( &cur->cert->pk, ssl->handshake->curves ) != 0 ) - { - MBEDTLS_SSL_DEBUG_MSG( 3, ( "certificate mismatch: elliptic curve" ) ); - continue; - } -#endif - - /* - * Try to select a SHA-1 certificate for pre-1.2 clients, but still - * present them a SHA-higher cert rather than failing if it's the only - * one we got that satisfies the other conditions. - */ - if( ssl->minor_ver < MBEDTLS_SSL_MINOR_VERSION_3 && - cur->cert->sig_md != MBEDTLS_MD_SHA1 ) - { - if( fallback == NULL ) - fallback = cur; - { - MBEDTLS_SSL_DEBUG_MSG( 3, ( "certificate not preferred: " - "sha-2 with pre-TLS 1.2 client" ) ); - continue; - } - } - - /* If we get there, we got a winner */ - break; - } - - if( cur == NULL ) - cur = fallback; - - /* Do not update ssl->handshake->key_cert unless there is a match */ - if( cur != NULL ) - { - ssl->handshake->key_cert = cur; - MBEDTLS_SSL_DEBUG_CRT( 3, "selected certificate chain, certificate", - ssl->handshake->key_cert->cert ); - return( 0 ); - } - - return( -1 ); -} -#endif /* MBEDTLS_X509_CRT_PARSE_C */ - -/* - * Check if a given ciphersuite is suitable for use with our config/keys/etc - * Sets ciphersuite_info only if the suite matches. - */ -static int ssl_ciphersuite_match( mbedtls_ssl_context *ssl, int suite_id, - const mbedtls_ssl_ciphersuite_t **ciphersuite_info ) -{ - const mbedtls_ssl_ciphersuite_t *suite_info; - -#if defined(MBEDTLS_SSL_PROTO_TLS1_2) && \ - defined(MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED) - mbedtls_pk_type_t sig_type; -#endif - - suite_info = mbedtls_ssl_ciphersuite_from_id( suite_id ); - if( suite_info == NULL ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) ); - return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); - } - - MBEDTLS_SSL_DEBUG_MSG( 3, ( "trying ciphersuite: %s", suite_info->name ) ); - - if( suite_info->min_minor_ver > ssl->minor_ver || - suite_info->max_minor_ver < ssl->minor_ver ) - { - MBEDTLS_SSL_DEBUG_MSG( 3, ( "ciphersuite mismatch: version" ) ); - return( 0 ); - } - -#if defined(MBEDTLS_SSL_PROTO_DTLS) - if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM && - ( suite_info->flags & MBEDTLS_CIPHERSUITE_NODTLS ) ) - return( 0 ); -#endif - -#if defined(MBEDTLS_ARC4_C) - if( ssl->conf->arc4_disabled == MBEDTLS_SSL_ARC4_DISABLED && - suite_info->cipher == MBEDTLS_CIPHER_ARC4_128 ) - { - MBEDTLS_SSL_DEBUG_MSG( 3, ( "ciphersuite mismatch: rc4" ) ); - return( 0 ); - } -#endif - -#if defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED) - if( suite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECJPAKE && - ( ssl->handshake->cli_exts & MBEDTLS_TLS_EXT_ECJPAKE_KKPP_OK ) == 0 ) - { - MBEDTLS_SSL_DEBUG_MSG( 3, ( "ciphersuite mismatch: ecjpake " - "not configured or ext missing" ) ); - return( 0 ); - } -#endif - - -#if defined(MBEDTLS_ECDH_C) || defined(MBEDTLS_ECDSA_C) - if( mbedtls_ssl_ciphersuite_uses_ec( suite_info ) && - ( ssl->handshake->curves == NULL || - ssl->handshake->curves[0] == NULL ) ) - { - MBEDTLS_SSL_DEBUG_MSG( 3, ( "ciphersuite mismatch: " - "no common elliptic curve" ) ); - return( 0 ); - } -#endif - -#if defined(MBEDTLS_KEY_EXCHANGE__SOME__PSK_ENABLED) - /* If the ciphersuite requires a pre-shared key and we don't - * have one, skip it now rather than failing later */ - if( mbedtls_ssl_ciphersuite_uses_psk( suite_info ) && - ssl_conf_has_psk_or_cb( ssl->conf ) == 0 ) - { - MBEDTLS_SSL_DEBUG_MSG( 3, ( "ciphersuite mismatch: no pre-shared key" ) ); - return( 0 ); - } -#endif - -#if defined(MBEDTLS_SSL_PROTO_TLS1_2) && \ - defined(MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED) - /* If the ciphersuite requires signing, check whether - * a suitable hash algorithm is present. */ - if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_3 ) - { - sig_type = mbedtls_ssl_get_ciphersuite_sig_alg( suite_info ); - if( sig_type != MBEDTLS_PK_NONE && - mbedtls_ssl_sig_hash_set_find( &ssl->handshake->hash_algs, sig_type ) == MBEDTLS_MD_NONE ) - { - MBEDTLS_SSL_DEBUG_MSG( 3, ( "ciphersuite mismatch: no suitable hash algorithm " - "for signature algorithm %d", sig_type ) ); - return( 0 ); - } - } - -#endif /* MBEDTLS_SSL_PROTO_TLS1_2 && - MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED */ - -#if defined(MBEDTLS_X509_CRT_PARSE_C) - /* - * Final check: if ciphersuite requires us to have a - * certificate/key of a particular type: - * - select the appropriate certificate if we have one, or - * - try the next ciphersuite if we don't - * This must be done last since we modify the key_cert list. - */ - if( ssl_pick_cert( ssl, suite_info ) != 0 ) - { - MBEDTLS_SSL_DEBUG_MSG( 3, ( "ciphersuite mismatch: " - "no suitable certificate" ) ); - return( 0 ); - } -#endif - - *ciphersuite_info = suite_info; - return( 0 ); -} - -#if defined(MBEDTLS_SSL_SRV_SUPPORT_SSLV2_CLIENT_HELLO) -static int ssl_parse_client_hello_v2( mbedtls_ssl_context *ssl ) -{ - int ret, got_common_suite; - unsigned int i, j; - size_t n; - unsigned int ciph_len, sess_len, chal_len; - unsigned char *buf, *p; - const int *ciphersuites; - const mbedtls_ssl_ciphersuite_t *ciphersuite_info; - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> parse client hello v2" ) ); - -#if defined(MBEDTLS_SSL_RENEGOTIATION) - if( ssl->renego_status != MBEDTLS_SSL_INITIAL_HANDSHAKE ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "client hello v2 illegal for renegotiation" ) ); - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE ); - return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO ); - } -#endif /* MBEDTLS_SSL_RENEGOTIATION */ - - buf = ssl->in_hdr; - - MBEDTLS_SSL_DEBUG_BUF( 4, "record header", buf, 5 ); - - MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello v2, message type: %d", - buf[2] ) ); - MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello v2, message len.: %d", - ( ( buf[0] & 0x7F ) << 8 ) | buf[1] ) ); - MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello v2, max. version: [%d:%d]", - buf[3], buf[4] ) ); - - /* - * SSLv2 Client Hello - * - * Record layer: - * 0 . 1 message length - * - * SSL layer: - * 2 . 2 message type - * 3 . 4 protocol version - */ - if( buf[2] != MBEDTLS_SSL_HS_CLIENT_HELLO || - buf[3] != MBEDTLS_SSL_MAJOR_VERSION_3 ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) ); - return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO ); - } - - n = ( ( buf[0] << 8 ) | buf[1] ) & 0x7FFF; - - if( n < 17 || n > 512 ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) ); - return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO ); - } - - ssl->major_ver = MBEDTLS_SSL_MAJOR_VERSION_3; - ssl->minor_ver = ( buf[4] <= ssl->conf->max_minor_ver ) - ? buf[4] : ssl->conf->max_minor_ver; - - if( ssl->minor_ver < ssl->conf->min_minor_ver ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "client only supports ssl smaller than minimum" - " [%d:%d] < [%d:%d]", - ssl->major_ver, ssl->minor_ver, - ssl->conf->min_major_ver, ssl->conf->min_minor_ver ) ); - - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_PROTOCOL_VERSION ); - return( MBEDTLS_ERR_SSL_BAD_HS_PROTOCOL_VERSION ); - } - - ssl->handshake->max_major_ver = buf[3]; - ssl->handshake->max_minor_ver = buf[4]; - - if( ( ret = mbedtls_ssl_fetch_input( ssl, 2 + n ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_fetch_input", ret ); - return( ret ); - } - - ssl->handshake->update_checksum( ssl, buf + 2, n ); - - buf = ssl->in_msg; - n = ssl->in_left - 5; - - /* - * 0 . 1 ciphersuitelist length - * 2 . 3 session id length - * 4 . 5 challenge length - * 6 . .. ciphersuitelist - * .. . .. session id - * .. . .. challenge - */ - MBEDTLS_SSL_DEBUG_BUF( 4, "record contents", buf, n ); - - ciph_len = ( buf[0] << 8 ) | buf[1]; - sess_len = ( buf[2] << 8 ) | buf[3]; - chal_len = ( buf[4] << 8 ) | buf[5]; - - MBEDTLS_SSL_DEBUG_MSG( 3, ( "ciph_len: %d, sess_len: %d, chal_len: %d", - ciph_len, sess_len, chal_len ) ); - - /* - * Make sure each parameter length is valid - */ - if( ciph_len < 3 || ( ciph_len % 3 ) != 0 ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) ); - return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO ); - } - - if( sess_len > 32 ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) ); - return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO ); - } - - if( chal_len < 8 || chal_len > 32 ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) ); - return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO ); - } - - if( n != 6 + ciph_len + sess_len + chal_len ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) ); - return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO ); - } - - MBEDTLS_SSL_DEBUG_BUF( 3, "client hello, ciphersuitelist", - buf + 6, ciph_len ); - MBEDTLS_SSL_DEBUG_BUF( 3, "client hello, session id", - buf + 6 + ciph_len, sess_len ); - MBEDTLS_SSL_DEBUG_BUF( 3, "client hello, challenge", - buf + 6 + ciph_len + sess_len, chal_len ); - - p = buf + 6 + ciph_len; - ssl->session_negotiate->id_len = sess_len; - memset( ssl->session_negotiate->id, 0, - sizeof( ssl->session_negotiate->id ) ); - memcpy( ssl->session_negotiate->id, p, ssl->session_negotiate->id_len ); - - p += sess_len; - memset( ssl->handshake->randbytes, 0, 64 ); - memcpy( ssl->handshake->randbytes + 32 - chal_len, p, chal_len ); - - /* - * Check for TLS_EMPTY_RENEGOTIATION_INFO_SCSV - */ - for( i = 0, p = buf + 6; i < ciph_len; i += 3, p += 3 ) - { - if( p[0] == 0 && p[1] == 0 && p[2] == MBEDTLS_SSL_EMPTY_RENEGOTIATION_INFO ) - { - MBEDTLS_SSL_DEBUG_MSG( 3, ( "received TLS_EMPTY_RENEGOTIATION_INFO " ) ); -#if defined(MBEDTLS_SSL_RENEGOTIATION) - if( ssl->renego_status == MBEDTLS_SSL_RENEGOTIATION_IN_PROGRESS ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "received RENEGOTIATION SCSV " - "during renegotiation" ) ); - - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE ); - return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO ); - } -#endif /* MBEDTLS_SSL_RENEGOTIATION */ - ssl->secure_renegotiation = MBEDTLS_SSL_SECURE_RENEGOTIATION; - break; - } - } - -#if defined(MBEDTLS_SSL_FALLBACK_SCSV) - for( i = 0, p = buf + 6; i < ciph_len; i += 3, p += 3 ) - { - if( p[0] == 0 && - p[1] == (unsigned char)( ( MBEDTLS_SSL_FALLBACK_SCSV_VALUE >> 8 ) & 0xff ) && - p[2] == (unsigned char)( ( MBEDTLS_SSL_FALLBACK_SCSV_VALUE ) & 0xff ) ) - { - MBEDTLS_SSL_DEBUG_MSG( 3, ( "received FALLBACK_SCSV" ) ); - - if( ssl->minor_ver < ssl->conf->max_minor_ver ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "inapropriate fallback" ) ); - - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_INAPROPRIATE_FALLBACK ); - - return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO ); - } - - break; - } - } -#endif /* MBEDTLS_SSL_FALLBACK_SCSV */ - - got_common_suite = 0; - ciphersuites = ssl->conf->ciphersuite_list[ssl->minor_ver]; - ciphersuite_info = NULL; -#if defined(MBEDTLS_SSL_SRV_RESPECT_CLIENT_PREFERENCE) - for( j = 0, p = buf + 6; j < ciph_len; j += 3, p += 3 ) - for( i = 0; ciphersuites[i] != 0; i++ ) -#else - for( i = 0; ciphersuites[i] != 0; i++ ) - for( j = 0, p = buf + 6; j < ciph_len; j += 3, p += 3 ) -#endif - { - if( p[0] != 0 || - p[1] != ( ( ciphersuites[i] >> 8 ) & 0xFF ) || - p[2] != ( ( ciphersuites[i] ) & 0xFF ) ) - continue; - - got_common_suite = 1; - - if( ( ret = ssl_ciphersuite_match( ssl, ciphersuites[i], - &ciphersuite_info ) ) != 0 ) - return( ret ); - - if( ciphersuite_info != NULL ) - goto have_ciphersuite_v2; - } - - if( got_common_suite ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "got ciphersuites in common, " - "but none of them usable" ) ); - return( MBEDTLS_ERR_SSL_NO_USABLE_CIPHERSUITE ); - } - else - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "got no ciphersuites in common" ) ); - return( MBEDTLS_ERR_SSL_NO_CIPHER_CHOSEN ); - } - -have_ciphersuite_v2: - MBEDTLS_SSL_DEBUG_MSG( 2, ( "selected ciphersuite: %s", ciphersuite_info->name ) ); - - ssl->session_negotiate->ciphersuite = ciphersuites[i]; - ssl->handshake->ciphersuite_info = ciphersuite_info; - - /* - * SSLv2 Client Hello relevant renegotiation security checks - */ - if( ssl->secure_renegotiation == MBEDTLS_SSL_LEGACY_RENEGOTIATION && - ssl->conf->allow_legacy_renegotiation == MBEDTLS_SSL_LEGACY_BREAK_HANDSHAKE ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "legacy renegotiation, breaking off handshake" ) ); - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE ); - return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO ); - } - - ssl->in_left = 0; - ssl->state++; - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= parse client hello v2" ) ); - - return( 0 ); -} -#endif /* MBEDTLS_SSL_SRV_SUPPORT_SSLV2_CLIENT_HELLO */ - -/* This function doesn't alert on errors that happen early during - ClientHello parsing because they might indicate that the client is - not talking SSL/TLS at all and would not understand our alert. */ -static int ssl_parse_client_hello( mbedtls_ssl_context *ssl ) -{ - int ret, got_common_suite; - size_t i, j; - size_t ciph_offset, comp_offset, ext_offset; - size_t msg_len, ciph_len, sess_len, comp_len, ext_len; -#if defined(MBEDTLS_SSL_PROTO_DTLS) - size_t cookie_offset, cookie_len; -#endif - unsigned char *buf, *p, *ext; -#if defined(MBEDTLS_SSL_RENEGOTIATION) - int renegotiation_info_seen = 0; -#endif - int handshake_failure = 0; - const int *ciphersuites; - const mbedtls_ssl_ciphersuite_t *ciphersuite_info; - int major, minor; - - /* If there is no signature-algorithm extension present, - * we need to fall back to the default values for allowed - * signature-hash pairs. */ -#if defined(MBEDTLS_SSL_PROTO_TLS1_2) && \ - defined(MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED) - int sig_hash_alg_ext_present = 0; -#endif /* MBEDTLS_SSL_PROTO_TLS1_2 && - MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED */ - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> parse client hello" ) ); - -#if defined(MBEDTLS_SSL_DTLS_ANTI_REPLAY) -read_record_header: -#endif - /* - * If renegotiating, then the input was read with mbedtls_ssl_read_record(), - * otherwise read it ourselves manually in order to support SSLv2 - * ClientHello, which doesn't use the same record layer format. - */ -#if defined(MBEDTLS_SSL_RENEGOTIATION) - if( ssl->renego_status == MBEDTLS_SSL_INITIAL_HANDSHAKE ) -#endif - { - if( ( ret = mbedtls_ssl_fetch_input( ssl, 5 ) ) != 0 ) - { - /* No alert on a read error. */ - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_fetch_input", ret ); - return( ret ); - } - } - - buf = ssl->in_hdr; - -#if defined(MBEDTLS_SSL_SRV_SUPPORT_SSLV2_CLIENT_HELLO) -#if defined(MBEDTLS_SSL_PROTO_DTLS) - if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_STREAM ) -#endif - if( ( buf[0] & 0x80 ) != 0 ) - return( ssl_parse_client_hello_v2( ssl ) ); -#endif - - MBEDTLS_SSL_DEBUG_BUF( 4, "record header", buf, mbedtls_ssl_in_hdr_len( ssl ) ); - - /* - * SSLv3/TLS Client Hello - * - * Record layer: - * 0 . 0 message type - * 1 . 2 protocol version - * 3 . 11 DTLS: epoch + record sequence number - * 3 . 4 message length - */ - MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello v3, message type: %d", - buf[0] ) ); - - if( buf[0] != MBEDTLS_SSL_MSG_HANDSHAKE ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) ); - return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO ); - } - - MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello v3, message len.: %d", - ( ssl->in_len[0] << 8 ) | ssl->in_len[1] ) ); - - MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello v3, protocol version: [%d:%d]", - buf[1], buf[2] ) ); - - mbedtls_ssl_read_version( &major, &minor, ssl->conf->transport, buf + 1 ); - - /* According to RFC 5246 Appendix E.1, the version here is typically - * "{03,00}, the lowest version number supported by the client, [or] the - * value of ClientHello.client_version", so the only meaningful check here - * is the major version shouldn't be less than 3 */ - if( major < MBEDTLS_SSL_MAJOR_VERSION_3 ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) ); - return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO ); - } - - /* For DTLS if this is the initial handshake, remember the client sequence - * number to use it in our next message (RFC 6347 4.2.1) */ -#if defined(MBEDTLS_SSL_PROTO_DTLS) - if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM -#if defined(MBEDTLS_SSL_RENEGOTIATION) - && ssl->renego_status == MBEDTLS_SSL_INITIAL_HANDSHAKE -#endif - ) - { - /* Epoch should be 0 for initial handshakes */ - if( ssl->in_ctr[0] != 0 || ssl->in_ctr[1] != 0 ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) ); - return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO ); - } - - memcpy( ssl->cur_out_ctr + 2, ssl->in_ctr + 2, 6 ); - -#if defined(MBEDTLS_SSL_DTLS_ANTI_REPLAY) - if( mbedtls_ssl_dtls_replay_check( ssl ) != 0 ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "replayed record, discarding" ) ); - ssl->next_record_offset = 0; - ssl->in_left = 0; - goto read_record_header; - } - - /* No MAC to check yet, so we can update right now */ - mbedtls_ssl_dtls_replay_update( ssl ); -#endif - } -#endif /* MBEDTLS_SSL_PROTO_DTLS */ - - msg_len = ( ssl->in_len[0] << 8 ) | ssl->in_len[1]; - -#if defined(MBEDTLS_SSL_RENEGOTIATION) - if( ssl->renego_status != MBEDTLS_SSL_INITIAL_HANDSHAKE ) - { - /* Set by mbedtls_ssl_read_record() */ - msg_len = ssl->in_hslen; - } - else -#endif - { - if( msg_len > MBEDTLS_SSL_IN_CONTENT_LEN ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) ); - return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO ); - } - - if( ( ret = mbedtls_ssl_fetch_input( ssl, - mbedtls_ssl_in_hdr_len( ssl ) + msg_len ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_fetch_input", ret ); - return( ret ); - } - - /* Done reading this record, get ready for the next one */ -#if defined(MBEDTLS_SSL_PROTO_DTLS) - if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM ) - ssl->next_record_offset = msg_len + mbedtls_ssl_in_hdr_len( ssl ); - else -#endif - ssl->in_left = 0; - } - - buf = ssl->in_msg; - - MBEDTLS_SSL_DEBUG_BUF( 4, "record contents", buf, msg_len ); - - ssl->handshake->update_checksum( ssl, buf, msg_len ); - - /* - * Handshake layer: - * 0 . 0 handshake type - * 1 . 3 handshake length - * 4 . 5 DTLS only: message seqence number - * 6 . 8 DTLS only: fragment offset - * 9 . 11 DTLS only: fragment length - */ - if( msg_len < mbedtls_ssl_hs_hdr_len( ssl ) ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) ); - return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO ); - } - - MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello v3, handshake type: %d", buf[0] ) ); - - if( buf[0] != MBEDTLS_SSL_HS_CLIENT_HELLO ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) ); - return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO ); - } - - MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello v3, handshake len.: %d", - ( buf[1] << 16 ) | ( buf[2] << 8 ) | buf[3] ) ); - - /* We don't support fragmentation of ClientHello (yet?) */ - if( buf[1] != 0 || - msg_len != mbedtls_ssl_hs_hdr_len( ssl ) + ( ( buf[2] << 8 ) | buf[3] ) ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) ); - return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO ); - } - -#if defined(MBEDTLS_SSL_PROTO_DTLS) - if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM ) - { - /* - * Copy the client's handshake message_seq on initial handshakes, - * check sequence number on renego. - */ -#if defined(MBEDTLS_SSL_RENEGOTIATION) - if( ssl->renego_status == MBEDTLS_SSL_RENEGOTIATION_IN_PROGRESS ) - { - /* This couldn't be done in ssl_prepare_handshake_record() */ - unsigned int cli_msg_seq = ( ssl->in_msg[4] << 8 ) | - ssl->in_msg[5]; - - if( cli_msg_seq != ssl->handshake->in_msg_seq ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message_seq: " - "%d (expected %d)", cli_msg_seq, - ssl->handshake->in_msg_seq ) ); - return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO ); - } - - ssl->handshake->in_msg_seq++; - } - else -#endif - { - unsigned int cli_msg_seq = ( ssl->in_msg[4] << 8 ) | - ssl->in_msg[5]; - ssl->handshake->out_msg_seq = cli_msg_seq; - ssl->handshake->in_msg_seq = cli_msg_seq + 1; - } - - /* - * For now we don't support fragmentation, so make sure - * fragment_offset == 0 and fragment_length == length - */ - if( ssl->in_msg[6] != 0 || ssl->in_msg[7] != 0 || ssl->in_msg[8] != 0 || - memcmp( ssl->in_msg + 1, ssl->in_msg + 9, 3 ) != 0 ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "ClientHello fragmentation not supported" ) ); - return( MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE ); - } - } -#endif /* MBEDTLS_SSL_PROTO_DTLS */ - - buf += mbedtls_ssl_hs_hdr_len( ssl ); - msg_len -= mbedtls_ssl_hs_hdr_len( ssl ); - - /* - * ClientHello layer: - * 0 . 1 protocol version - * 2 . 33 random bytes (starting with 4 bytes of Unix time) - * 34 . 35 session id length (1 byte) - * 35 . 34+x session id - * 35+x . 35+x DTLS only: cookie length (1 byte) - * 36+x . .. DTLS only: cookie - * .. . .. ciphersuite list length (2 bytes) - * .. . .. ciphersuite list - * .. . .. compression alg. list length (1 byte) - * .. . .. compression alg. list - * .. . .. extensions length (2 bytes, optional) - * .. . .. extensions (optional) - */ - - /* - * Minimal length (with everything empty and extensions omitted) is - * 2 + 32 + 1 + 2 + 1 = 38 bytes. Check that first, so that we can - * read at least up to session id length without worrying. - */ - if( msg_len < 38 ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) ); - return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO ); - } - - /* - * Check and save the protocol version - */ - MBEDTLS_SSL_DEBUG_BUF( 3, "client hello, version", buf, 2 ); - - mbedtls_ssl_read_version( &ssl->major_ver, &ssl->minor_ver, - ssl->conf->transport, buf ); - - ssl->handshake->max_major_ver = ssl->major_ver; - ssl->handshake->max_minor_ver = ssl->minor_ver; - - if( ssl->major_ver < ssl->conf->min_major_ver || - ssl->minor_ver < ssl->conf->min_minor_ver ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "client only supports ssl smaller than minimum" - " [%d:%d] < [%d:%d]", - ssl->major_ver, ssl->minor_ver, - ssl->conf->min_major_ver, ssl->conf->min_minor_ver ) ); - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_PROTOCOL_VERSION ); - return( MBEDTLS_ERR_SSL_BAD_HS_PROTOCOL_VERSION ); - } - - if( ssl->major_ver > ssl->conf->max_major_ver ) - { - ssl->major_ver = ssl->conf->max_major_ver; - ssl->minor_ver = ssl->conf->max_minor_ver; - } - else if( ssl->minor_ver > ssl->conf->max_minor_ver ) - ssl->minor_ver = ssl->conf->max_minor_ver; - - /* - * Save client random (inc. Unix time) - */ - MBEDTLS_SSL_DEBUG_BUF( 3, "client hello, random bytes", buf + 2, 32 ); - - memcpy( ssl->handshake->randbytes, buf + 2, 32 ); - - /* - * Check the session ID length and save session ID - */ - sess_len = buf[34]; - - if( sess_len > sizeof( ssl->session_negotiate->id ) || - sess_len + 34 + 2 > msg_len ) /* 2 for cipherlist length field */ - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) ); - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR ); - return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO ); - } - - MBEDTLS_SSL_DEBUG_BUF( 3, "client hello, session id", buf + 35, sess_len ); - - ssl->session_negotiate->id_len = sess_len; - memset( ssl->session_negotiate->id, 0, - sizeof( ssl->session_negotiate->id ) ); - memcpy( ssl->session_negotiate->id, buf + 35, - ssl->session_negotiate->id_len ); - - /* - * Check the cookie length and content - */ -#if defined(MBEDTLS_SSL_PROTO_DTLS) - if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM ) - { - cookie_offset = 35 + sess_len; - cookie_len = buf[cookie_offset]; - - if( cookie_offset + 1 + cookie_len + 2 > msg_len ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) ); - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_PROTOCOL_VERSION ); - return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO ); - } - - MBEDTLS_SSL_DEBUG_BUF( 3, "client hello, cookie", - buf + cookie_offset + 1, cookie_len ); - -#if defined(MBEDTLS_SSL_DTLS_HELLO_VERIFY) - if( ssl->conf->f_cookie_check != NULL -#if defined(MBEDTLS_SSL_RENEGOTIATION) - && ssl->renego_status == MBEDTLS_SSL_INITIAL_HANDSHAKE -#endif - ) - { - if( ssl->conf->f_cookie_check( ssl->conf->p_cookie, - buf + cookie_offset + 1, cookie_len, - ssl->cli_id, ssl->cli_id_len ) != 0 ) - { - MBEDTLS_SSL_DEBUG_MSG( 2, ( "cookie verification failed" ) ); - ssl->handshake->verify_cookie_len = 1; - } - else - { - MBEDTLS_SSL_DEBUG_MSG( 2, ( "cookie verification passed" ) ); - ssl->handshake->verify_cookie_len = 0; - } - } - else -#endif /* MBEDTLS_SSL_DTLS_HELLO_VERIFY */ - { - /* We know we didn't send a cookie, so it should be empty */ - if( cookie_len != 0 ) - { - /* This may be an attacker's probe, so don't send an alert */ - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) ); - return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO ); - } - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "cookie verification skipped" ) ); - } - - /* - * Check the ciphersuitelist length (will be parsed later) - */ - ciph_offset = cookie_offset + 1 + cookie_len; - } - else -#endif /* MBEDTLS_SSL_PROTO_DTLS */ - ciph_offset = 35 + sess_len; - - ciph_len = ( buf[ciph_offset + 0] << 8 ) - | ( buf[ciph_offset + 1] ); - - if( ciph_len < 2 || - ciph_len + 2 + ciph_offset + 1 > msg_len || /* 1 for comp. alg. len */ - ( ciph_len % 2 ) != 0 ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) ); - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR ); - return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO ); - } - - MBEDTLS_SSL_DEBUG_BUF( 3, "client hello, ciphersuitelist", - buf + ciph_offset + 2, ciph_len ); - - /* - * Check the compression algorithms length and pick one - */ - comp_offset = ciph_offset + 2 + ciph_len; - - comp_len = buf[comp_offset]; - - if( comp_len < 1 || - comp_len > 16 || - comp_len + comp_offset + 1 > msg_len ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) ); - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR ); - return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO ); - } - - MBEDTLS_SSL_DEBUG_BUF( 3, "client hello, compression", - buf + comp_offset + 1, comp_len ); - - ssl->session_negotiate->compression = MBEDTLS_SSL_COMPRESS_NULL; -#if defined(MBEDTLS_ZLIB_SUPPORT) - for( i = 0; i < comp_len; ++i ) - { - if( buf[comp_offset + 1 + i] == MBEDTLS_SSL_COMPRESS_DEFLATE ) - { - ssl->session_negotiate->compression = MBEDTLS_SSL_COMPRESS_DEFLATE; - break; - } - } -#endif - - /* See comments in ssl_write_client_hello() */ -#if defined(MBEDTLS_SSL_PROTO_DTLS) - if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM ) - ssl->session_negotiate->compression = MBEDTLS_SSL_COMPRESS_NULL; -#endif - - /* Do not parse the extensions if the protocol is SSLv3 */ -#if defined(MBEDTLS_SSL_PROTO_SSL3) - if( ( ssl->major_ver != 3 ) || ( ssl->minor_ver != 0 ) ) - { -#endif - /* - * Check the extension length - */ - ext_offset = comp_offset + 1 + comp_len; - if( msg_len > ext_offset ) - { - if( msg_len < ext_offset + 2 ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) ); - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR ); - return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO ); - } - - ext_len = ( buf[ext_offset + 0] << 8 ) - | ( buf[ext_offset + 1] ); - - if( ( ext_len > 0 && ext_len < 4 ) || - msg_len != ext_offset + 2 + ext_len ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) ); - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR ); - return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO ); - } - } - else - ext_len = 0; - - ext = buf + ext_offset + 2; - MBEDTLS_SSL_DEBUG_BUF( 3, "client hello extensions", ext, ext_len ); - - while( ext_len != 0 ) - { - unsigned int ext_id; - unsigned int ext_size; - if ( ext_len < 4 ) { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) ); - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR ); - return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO ); - } - ext_id = ( ( ext[0] << 8 ) | ( ext[1] ) ); - ext_size = ( ( ext[2] << 8 ) | ( ext[3] ) ); - - if( ext_size + 4 > ext_len ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) ); - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR ); - return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO ); - } - switch( ext_id ) - { -#if defined(MBEDTLS_SSL_SERVER_NAME_INDICATION) - case MBEDTLS_TLS_EXT_SERVERNAME: - MBEDTLS_SSL_DEBUG_MSG( 3, ( "found ServerName extension" ) ); - if( ssl->conf->f_sni == NULL ) - break; - - ret = ssl_parse_servername_ext( ssl, ext + 4, ext_size ); - if( ret != 0 ) - return( ret ); - break; -#endif /* MBEDTLS_SSL_SERVER_NAME_INDICATION */ - - case MBEDTLS_TLS_EXT_RENEGOTIATION_INFO: - MBEDTLS_SSL_DEBUG_MSG( 3, ( "found renegotiation extension" ) ); -#if defined(MBEDTLS_SSL_RENEGOTIATION) - renegotiation_info_seen = 1; -#endif - - ret = ssl_parse_renegotiation_info( ssl, ext + 4, ext_size ); - if( ret != 0 ) - return( ret ); - break; - -#if defined(MBEDTLS_SSL_PROTO_TLS1_2) && \ - defined(MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED) - case MBEDTLS_TLS_EXT_SIG_ALG: - MBEDTLS_SSL_DEBUG_MSG( 3, ( "found signature_algorithms extension" ) ); - - ret = ssl_parse_signature_algorithms_ext( ssl, ext + 4, ext_size ); - if( ret != 0 ) - return( ret ); - - sig_hash_alg_ext_present = 1; - break; -#endif /* MBEDTLS_SSL_PROTO_TLS1_2 && - MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED */ - -#if defined(MBEDTLS_ECDH_C) || defined(MBEDTLS_ECDSA_C) || \ - defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED) - case MBEDTLS_TLS_EXT_SUPPORTED_ELLIPTIC_CURVES: - MBEDTLS_SSL_DEBUG_MSG( 3, ( "found supported elliptic curves extension" ) ); - - ret = ssl_parse_supported_elliptic_curves( ssl, ext + 4, ext_size ); - if( ret != 0 ) - return( ret ); - break; - - case MBEDTLS_TLS_EXT_SUPPORTED_POINT_FORMATS: - MBEDTLS_SSL_DEBUG_MSG( 3, ( "found supported point formats extension" ) ); - ssl->handshake->cli_exts |= MBEDTLS_TLS_EXT_SUPPORTED_POINT_FORMATS_PRESENT; - - ret = ssl_parse_supported_point_formats( ssl, ext + 4, ext_size ); - if( ret != 0 ) - return( ret ); - break; -#endif /* MBEDTLS_ECDH_C || MBEDTLS_ECDSA_C || - MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED */ - -#if defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED) - case MBEDTLS_TLS_EXT_ECJPAKE_KKPP: - MBEDTLS_SSL_DEBUG_MSG( 3, ( "found ecjpake kkpp extension" ) ); - - ret = ssl_parse_ecjpake_kkpp( ssl, ext + 4, ext_size ); - if( ret != 0 ) - return( ret ); - break; -#endif /* MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED */ - -#if defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH) - case MBEDTLS_TLS_EXT_MAX_FRAGMENT_LENGTH: - MBEDTLS_SSL_DEBUG_MSG( 3, ( "found max fragment length extension" ) ); - - ret = ssl_parse_max_fragment_length_ext( ssl, ext + 4, ext_size ); - if( ret != 0 ) - return( ret ); - break; -#endif /* MBEDTLS_SSL_MAX_FRAGMENT_LENGTH */ - -#if defined(MBEDTLS_SSL_TRUNCATED_HMAC) - case MBEDTLS_TLS_EXT_TRUNCATED_HMAC: - MBEDTLS_SSL_DEBUG_MSG( 3, ( "found truncated hmac extension" ) ); - - ret = ssl_parse_truncated_hmac_ext( ssl, ext + 4, ext_size ); - if( ret != 0 ) - return( ret ); - break; -#endif /* MBEDTLS_SSL_TRUNCATED_HMAC */ - -#if defined(MBEDTLS_SSL_DTLS_CONNECTION_ID) - case MBEDTLS_TLS_EXT_CID: - MBEDTLS_SSL_DEBUG_MSG( 3, ( "found CID extension" ) ); - - ret = ssl_parse_cid_ext( ssl, ext + 4, ext_size ); - if( ret != 0 ) - return( ret ); - break; -#endif /* MBEDTLS_SSL_TRUNCATED_HMAC */ - -#if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC) - case MBEDTLS_TLS_EXT_ENCRYPT_THEN_MAC: - MBEDTLS_SSL_DEBUG_MSG( 3, ( "found encrypt then mac extension" ) ); - - ret = ssl_parse_encrypt_then_mac_ext( ssl, ext + 4, ext_size ); - if( ret != 0 ) - return( ret ); - break; -#endif /* MBEDTLS_SSL_ENCRYPT_THEN_MAC */ - -#if defined(MBEDTLS_SSL_EXTENDED_MASTER_SECRET) - case MBEDTLS_TLS_EXT_EXTENDED_MASTER_SECRET: - MBEDTLS_SSL_DEBUG_MSG( 3, ( "found extended master secret extension" ) ); - - ret = ssl_parse_extended_ms_ext( ssl, ext + 4, ext_size ); - if( ret != 0 ) - return( ret ); - break; -#endif /* MBEDTLS_SSL_EXTENDED_MASTER_SECRET */ - -#if defined(MBEDTLS_SSL_SESSION_TICKETS) - case MBEDTLS_TLS_EXT_SESSION_TICKET: - MBEDTLS_SSL_DEBUG_MSG( 3, ( "found session ticket extension" ) ); - - ret = ssl_parse_session_ticket_ext( ssl, ext + 4, ext_size ); - if( ret != 0 ) - return( ret ); - break; -#endif /* MBEDTLS_SSL_SESSION_TICKETS */ - -#if defined(MBEDTLS_SSL_ALPN) - case MBEDTLS_TLS_EXT_ALPN: - MBEDTLS_SSL_DEBUG_MSG( 3, ( "found alpn extension" ) ); - - ret = ssl_parse_alpn_ext( ssl, ext + 4, ext_size ); - if( ret != 0 ) - return( ret ); - break; -#endif /* MBEDTLS_SSL_SESSION_TICKETS */ - - default: - MBEDTLS_SSL_DEBUG_MSG( 3, ( "unknown extension found: %d (ignoring)", - ext_id ) ); - } - - ext_len -= 4 + ext_size; - ext += 4 + ext_size; - - if( ext_len > 0 && ext_len < 4 ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) ); - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR ); - return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO ); - } - } -#if defined(MBEDTLS_SSL_PROTO_SSL3) - } -#endif - -#if defined(MBEDTLS_SSL_FALLBACK_SCSV) - for( i = 0, p = buf + ciph_offset + 2; i < ciph_len; i += 2, p += 2 ) - { - if( p[0] == (unsigned char)( ( MBEDTLS_SSL_FALLBACK_SCSV_VALUE >> 8 ) & 0xff ) && - p[1] == (unsigned char)( ( MBEDTLS_SSL_FALLBACK_SCSV_VALUE ) & 0xff ) ) - { - MBEDTLS_SSL_DEBUG_MSG( 2, ( "received FALLBACK_SCSV" ) ); - - if( ssl->minor_ver < ssl->conf->max_minor_ver ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "inapropriate fallback" ) ); - - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_INAPROPRIATE_FALLBACK ); - - return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO ); - } - - break; - } - } -#endif /* MBEDTLS_SSL_FALLBACK_SCSV */ - -#if defined(MBEDTLS_SSL_PROTO_TLS1_2) && \ - defined(MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED) - - /* - * Try to fall back to default hash SHA1 if the client - * hasn't provided any preferred signature-hash combinations. - */ - if( sig_hash_alg_ext_present == 0 ) - { - mbedtls_md_type_t md_default = MBEDTLS_MD_SHA1; - - if( mbedtls_ssl_check_sig_hash( ssl, md_default ) != 0 ) - md_default = MBEDTLS_MD_NONE; - - mbedtls_ssl_sig_hash_set_const_hash( &ssl->handshake->hash_algs, md_default ); - } - -#endif /* MBEDTLS_SSL_PROTO_TLS1_2 && - MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED */ - - /* - * Check for TLS_EMPTY_RENEGOTIATION_INFO_SCSV - */ - for( i = 0, p = buf + ciph_offset + 2; i < ciph_len; i += 2, p += 2 ) - { - if( p[0] == 0 && p[1] == MBEDTLS_SSL_EMPTY_RENEGOTIATION_INFO ) - { - MBEDTLS_SSL_DEBUG_MSG( 3, ( "received TLS_EMPTY_RENEGOTIATION_INFO " ) ); -#if defined(MBEDTLS_SSL_RENEGOTIATION) - if( ssl->renego_status == MBEDTLS_SSL_RENEGOTIATION_IN_PROGRESS ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "received RENEGOTIATION SCSV " - "during renegotiation" ) ); - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE ); - return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO ); - } -#endif - ssl->secure_renegotiation = MBEDTLS_SSL_SECURE_RENEGOTIATION; - break; - } - } - - /* - * Renegotiation security checks - */ - if( ssl->secure_renegotiation != MBEDTLS_SSL_SECURE_RENEGOTIATION && - ssl->conf->allow_legacy_renegotiation == MBEDTLS_SSL_LEGACY_BREAK_HANDSHAKE ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "legacy renegotiation, breaking off handshake" ) ); - handshake_failure = 1; - } -#if defined(MBEDTLS_SSL_RENEGOTIATION) - else if( ssl->renego_status == MBEDTLS_SSL_RENEGOTIATION_IN_PROGRESS && - ssl->secure_renegotiation == MBEDTLS_SSL_SECURE_RENEGOTIATION && - renegotiation_info_seen == 0 ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "renegotiation_info extension missing (secure)" ) ); - handshake_failure = 1; - } - else if( ssl->renego_status == MBEDTLS_SSL_RENEGOTIATION_IN_PROGRESS && - ssl->secure_renegotiation == MBEDTLS_SSL_LEGACY_RENEGOTIATION && - ssl->conf->allow_legacy_renegotiation == MBEDTLS_SSL_LEGACY_NO_RENEGOTIATION ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "legacy renegotiation not allowed" ) ); - handshake_failure = 1; - } - else if( ssl->renego_status == MBEDTLS_SSL_RENEGOTIATION_IN_PROGRESS && - ssl->secure_renegotiation == MBEDTLS_SSL_LEGACY_RENEGOTIATION && - renegotiation_info_seen == 1 ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "renegotiation_info extension present (legacy)" ) ); - handshake_failure = 1; - } -#endif /* MBEDTLS_SSL_RENEGOTIATION */ - - if( handshake_failure == 1 ) - { - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE ); - return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO ); - } - - /* - * Search for a matching ciphersuite - * (At the end because we need information from the EC-based extensions - * and certificate from the SNI callback triggered by the SNI extension.) - */ - got_common_suite = 0; - ciphersuites = ssl->conf->ciphersuite_list[ssl->minor_ver]; - ciphersuite_info = NULL; -#if defined(MBEDTLS_SSL_SRV_RESPECT_CLIENT_PREFERENCE) - for( j = 0, p = buf + ciph_offset + 2; j < ciph_len; j += 2, p += 2 ) - for( i = 0; ciphersuites[i] != 0; i++ ) -#else - for( i = 0; ciphersuites[i] != 0; i++ ) - for( j = 0, p = buf + ciph_offset + 2; j < ciph_len; j += 2, p += 2 ) -#endif - { - if( p[0] != ( ( ciphersuites[i] >> 8 ) & 0xFF ) || - p[1] != ( ( ciphersuites[i] ) & 0xFF ) ) - continue; - - got_common_suite = 1; - - if( ( ret = ssl_ciphersuite_match( ssl, ciphersuites[i], - &ciphersuite_info ) ) != 0 ) - return( ret ); - - if( ciphersuite_info != NULL ) - goto have_ciphersuite; - } - - if( got_common_suite ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "got ciphersuites in common, " - "but none of them usable" ) ); - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE ); - return( MBEDTLS_ERR_SSL_NO_USABLE_CIPHERSUITE ); - } - else - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "got no ciphersuites in common" ) ); - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE ); - return( MBEDTLS_ERR_SSL_NO_CIPHER_CHOSEN ); - } - -have_ciphersuite: - MBEDTLS_SSL_DEBUG_MSG( 2, ( "selected ciphersuite: %s", ciphersuite_info->name ) ); - - ssl->session_negotiate->ciphersuite = ciphersuites[i]; - ssl->handshake->ciphersuite_info = ciphersuite_info; - - ssl->state++; - -#if defined(MBEDTLS_SSL_PROTO_DTLS) - if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM ) - mbedtls_ssl_recv_flight_completed( ssl ); -#endif - - /* Debugging-only output for testsuite */ -#if defined(MBEDTLS_DEBUG_C) && \ - defined(MBEDTLS_SSL_PROTO_TLS1_2) && \ - defined(MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED) - if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_3 ) - { - mbedtls_pk_type_t sig_alg = mbedtls_ssl_get_ciphersuite_sig_alg( ciphersuite_info ); - if( sig_alg != MBEDTLS_PK_NONE ) - { - mbedtls_md_type_t md_alg = mbedtls_ssl_sig_hash_set_find( &ssl->handshake->hash_algs, - sig_alg ); - MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello v3, signature_algorithm ext: %d", - mbedtls_ssl_hash_from_md_alg( md_alg ) ) ); - } - else - { - MBEDTLS_SSL_DEBUG_MSG( 3, ( "no hash algorithm for signature algorithm " - "%d - should not happen", sig_alg ) ); - } - } -#endif - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= parse client hello" ) ); - - return( 0 ); -} - -#if defined(MBEDTLS_SSL_TRUNCATED_HMAC) -static void ssl_write_truncated_hmac_ext( mbedtls_ssl_context *ssl, - unsigned char *buf, - size_t *olen ) -{ - unsigned char *p = buf; - - if( ssl->session_negotiate->trunc_hmac == MBEDTLS_SSL_TRUNC_HMAC_DISABLED ) - { - *olen = 0; - return; - } - - MBEDTLS_SSL_DEBUG_MSG( 3, ( "server hello, adding truncated hmac extension" ) ); - - *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_TRUNCATED_HMAC >> 8 ) & 0xFF ); - *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_TRUNCATED_HMAC ) & 0xFF ); - - *p++ = 0x00; - *p++ = 0x00; - - *olen = 4; -} -#endif /* MBEDTLS_SSL_TRUNCATED_HMAC */ - -#if defined(MBEDTLS_SSL_DTLS_CONNECTION_ID) -static void ssl_write_cid_ext( mbedtls_ssl_context *ssl, - unsigned char *buf, - size_t *olen ) -{ - unsigned char *p = buf; - size_t ext_len; - const unsigned char *end = ssl->out_msg + MBEDTLS_SSL_OUT_CONTENT_LEN; - - *olen = 0; - - /* Skip writing the extension if we don't want to use it or if - * the client hasn't offered it. */ - if( ssl->handshake->cid_in_use == MBEDTLS_SSL_CID_DISABLED ) - return; - - /* ssl->own_cid_len is at most MBEDTLS_SSL_CID_IN_LEN_MAX - * which is at most 255, so the increment cannot overflow. */ - if( end < p || (size_t)( end - p ) < (unsigned)( ssl->own_cid_len + 5 ) ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "buffer too small" ) ); - return; - } - - MBEDTLS_SSL_DEBUG_MSG( 3, ( "server hello, adding CID extension" ) ); - - /* - * Quoting draft-ietf-tls-dtls-connection-id-05 - * https://tools.ietf.org/html/draft-ietf-tls-dtls-connection-id-05 - * - * struct { - * opaque cid<0..2^8-1>; - * } ConnectionId; - */ - - *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_CID >> 8 ) & 0xFF ); - *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_CID ) & 0xFF ); - ext_len = (size_t) ssl->own_cid_len + 1; - *p++ = (unsigned char)( ( ext_len >> 8 ) & 0xFF ); - *p++ = (unsigned char)( ( ext_len ) & 0xFF ); - - *p++ = (uint8_t) ssl->own_cid_len; - memcpy( p, ssl->own_cid, ssl->own_cid_len ); - - *olen = ssl->own_cid_len + 5; -} -#endif /* MBEDTLS_SSL_DTLS_CONNECTION_ID */ - -#if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC) -static void ssl_write_encrypt_then_mac_ext( mbedtls_ssl_context *ssl, - unsigned char *buf, - size_t *olen ) -{ - unsigned char *p = buf; - const mbedtls_ssl_ciphersuite_t *suite = NULL; - const mbedtls_cipher_info_t *cipher = NULL; - - if( ssl->session_negotiate->encrypt_then_mac == MBEDTLS_SSL_ETM_DISABLED || - ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 ) - { - *olen = 0; - return; - } - - /* - * RFC 7366: "If a server receives an encrypt-then-MAC request extension - * from a client and then selects a stream or Authenticated Encryption - * with Associated Data (AEAD) ciphersuite, it MUST NOT send an - * encrypt-then-MAC response extension back to the client." - */ - if( ( suite = mbedtls_ssl_ciphersuite_from_id( - ssl->session_negotiate->ciphersuite ) ) == NULL || - ( cipher = mbedtls_cipher_info_from_type( suite->cipher ) ) == NULL || - cipher->mode != MBEDTLS_MODE_CBC ) - { - *olen = 0; - return; - } - - MBEDTLS_SSL_DEBUG_MSG( 3, ( "server hello, adding encrypt then mac extension" ) ); - - *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_ENCRYPT_THEN_MAC >> 8 ) & 0xFF ); - *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_ENCRYPT_THEN_MAC ) & 0xFF ); - - *p++ = 0x00; - *p++ = 0x00; - - *olen = 4; -} -#endif /* MBEDTLS_SSL_ENCRYPT_THEN_MAC */ - -#if defined(MBEDTLS_SSL_EXTENDED_MASTER_SECRET) -static void ssl_write_extended_ms_ext( mbedtls_ssl_context *ssl, - unsigned char *buf, - size_t *olen ) -{ - unsigned char *p = buf; - - if( ssl->handshake->extended_ms == MBEDTLS_SSL_EXTENDED_MS_DISABLED || - ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 ) - { - *olen = 0; - return; - } - - MBEDTLS_SSL_DEBUG_MSG( 3, ( "server hello, adding extended master secret " - "extension" ) ); - - *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_EXTENDED_MASTER_SECRET >> 8 ) & 0xFF ); - *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_EXTENDED_MASTER_SECRET ) & 0xFF ); - - *p++ = 0x00; - *p++ = 0x00; - - *olen = 4; -} -#endif /* MBEDTLS_SSL_EXTENDED_MASTER_SECRET */ - -#if defined(MBEDTLS_SSL_SESSION_TICKETS) -static void ssl_write_session_ticket_ext( mbedtls_ssl_context *ssl, - unsigned char *buf, - size_t *olen ) -{ - unsigned char *p = buf; - - if( ssl->handshake->new_session_ticket == 0 ) - { - *olen = 0; - return; - } - - MBEDTLS_SSL_DEBUG_MSG( 3, ( "server hello, adding session ticket extension" ) ); - - *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_SESSION_TICKET >> 8 ) & 0xFF ); - *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_SESSION_TICKET ) & 0xFF ); - - *p++ = 0x00; - *p++ = 0x00; - - *olen = 4; -} -#endif /* MBEDTLS_SSL_SESSION_TICKETS */ - -static void ssl_write_renegotiation_ext( mbedtls_ssl_context *ssl, - unsigned char *buf, - size_t *olen ) -{ - unsigned char *p = buf; - - if( ssl->secure_renegotiation != MBEDTLS_SSL_SECURE_RENEGOTIATION ) - { - *olen = 0; - return; - } - - MBEDTLS_SSL_DEBUG_MSG( 3, ( "server hello, secure renegotiation extension" ) ); - - *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_RENEGOTIATION_INFO >> 8 ) & 0xFF ); - *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_RENEGOTIATION_INFO ) & 0xFF ); - -#if defined(MBEDTLS_SSL_RENEGOTIATION) - if( ssl->renego_status != MBEDTLS_SSL_INITIAL_HANDSHAKE ) - { - *p++ = 0x00; - *p++ = ( ssl->verify_data_len * 2 + 1 ) & 0xFF; - *p++ = ssl->verify_data_len * 2 & 0xFF; - - memcpy( p, ssl->peer_verify_data, ssl->verify_data_len ); - p += ssl->verify_data_len; - memcpy( p, ssl->own_verify_data, ssl->verify_data_len ); - p += ssl->verify_data_len; - } - else -#endif /* MBEDTLS_SSL_RENEGOTIATION */ - { - *p++ = 0x00; - *p++ = 0x01; - *p++ = 0x00; - } - - *olen = p - buf; -} - -#if defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH) -static void ssl_write_max_fragment_length_ext( mbedtls_ssl_context *ssl, - unsigned char *buf, - size_t *olen ) -{ - unsigned char *p = buf; - - if( ssl->session_negotiate->mfl_code == MBEDTLS_SSL_MAX_FRAG_LEN_NONE ) - { - *olen = 0; - return; - } - - MBEDTLS_SSL_DEBUG_MSG( 3, ( "server hello, max_fragment_length extension" ) ); - - *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_MAX_FRAGMENT_LENGTH >> 8 ) & 0xFF ); - *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_MAX_FRAGMENT_LENGTH ) & 0xFF ); - - *p++ = 0x00; - *p++ = 1; - - *p++ = ssl->session_negotiate->mfl_code; - - *olen = 5; -} -#endif /* MBEDTLS_SSL_MAX_FRAGMENT_LENGTH */ - -#if defined(MBEDTLS_ECDH_C) || defined(MBEDTLS_ECDSA_C) || \ - defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED) -static void ssl_write_supported_point_formats_ext( mbedtls_ssl_context *ssl, - unsigned char *buf, - size_t *olen ) -{ - unsigned char *p = buf; - ((void) ssl); - - if( ( ssl->handshake->cli_exts & - MBEDTLS_TLS_EXT_SUPPORTED_POINT_FORMATS_PRESENT ) == 0 ) - { - *olen = 0; - return; - } - - MBEDTLS_SSL_DEBUG_MSG( 3, ( "server hello, supported_point_formats extension" ) ); - - *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_SUPPORTED_POINT_FORMATS >> 8 ) & 0xFF ); - *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_SUPPORTED_POINT_FORMATS ) & 0xFF ); - - *p++ = 0x00; - *p++ = 2; - - *p++ = 1; - *p++ = MBEDTLS_ECP_PF_UNCOMPRESSED; - - *olen = 6; -} -#endif /* MBEDTLS_ECDH_C || MBEDTLS_ECDSA_C || MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED */ - -#if defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED) -static void ssl_write_ecjpake_kkpp_ext( mbedtls_ssl_context *ssl, - unsigned char *buf, - size_t *olen ) -{ - int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; - unsigned char *p = buf; - const unsigned char *end = ssl->out_msg + MBEDTLS_SSL_OUT_CONTENT_LEN; - size_t kkpp_len; - - *olen = 0; - - /* Skip costly computation if not needed */ - if( ssl->handshake->ciphersuite_info->key_exchange != - MBEDTLS_KEY_EXCHANGE_ECJPAKE ) - return; - - MBEDTLS_SSL_DEBUG_MSG( 3, ( "server hello, ecjpake kkpp extension" ) ); - - if( end - p < 4 ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "buffer too small" ) ); - return; - } - - *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_ECJPAKE_KKPP >> 8 ) & 0xFF ); - *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_ECJPAKE_KKPP ) & 0xFF ); - - ret = mbedtls_ecjpake_write_round_one( &ssl->handshake->ecjpake_ctx, - p + 2, end - p - 2, &kkpp_len, - ssl->conf->f_rng, ssl->conf->p_rng ); - if( ret != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1 , "mbedtls_ecjpake_write_round_one", ret ); - return; - } - - *p++ = (unsigned char)( ( kkpp_len >> 8 ) & 0xFF ); - *p++ = (unsigned char)( ( kkpp_len ) & 0xFF ); - - *olen = kkpp_len + 4; -} -#endif /* MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED */ - -#if defined(MBEDTLS_SSL_ALPN ) -static void ssl_write_alpn_ext( mbedtls_ssl_context *ssl, - unsigned char *buf, size_t *olen ) -{ - if( ssl->alpn_chosen == NULL ) - { - *olen = 0; - return; - } - - MBEDTLS_SSL_DEBUG_MSG( 3, ( "server hello, adding alpn extension" ) ); - - /* - * 0 . 1 ext identifier - * 2 . 3 ext length - * 4 . 5 protocol list length - * 6 . 6 protocol name length - * 7 . 7+n protocol name - */ - buf[0] = (unsigned char)( ( MBEDTLS_TLS_EXT_ALPN >> 8 ) & 0xFF ); - buf[1] = (unsigned char)( ( MBEDTLS_TLS_EXT_ALPN ) & 0xFF ); - - *olen = 7 + strlen( ssl->alpn_chosen ); - - buf[2] = (unsigned char)( ( ( *olen - 4 ) >> 8 ) & 0xFF ); - buf[3] = (unsigned char)( ( ( *olen - 4 ) ) & 0xFF ); - - buf[4] = (unsigned char)( ( ( *olen - 6 ) >> 8 ) & 0xFF ); - buf[5] = (unsigned char)( ( ( *olen - 6 ) ) & 0xFF ); - - buf[6] = (unsigned char)( ( ( *olen - 7 ) ) & 0xFF ); - - memcpy( buf + 7, ssl->alpn_chosen, *olen - 7 ); -} -#endif /* MBEDTLS_ECDH_C || MBEDTLS_ECDSA_C */ - -#if defined(MBEDTLS_SSL_DTLS_HELLO_VERIFY) -static int ssl_write_hello_verify_request( mbedtls_ssl_context *ssl ) -{ - int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; - unsigned char *p = ssl->out_msg + 4; - unsigned char *cookie_len_byte; - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> write hello verify request" ) ); - - /* - * struct { - * ProtocolVersion server_version; - * opaque cookie<0..2^8-1>; - * } HelloVerifyRequest; - */ - - /* The RFC is not clear on this point, but sending the actual negotiated - * version looks like the most interoperable thing to do. */ - mbedtls_ssl_write_version( ssl->major_ver, ssl->minor_ver, - ssl->conf->transport, p ); - MBEDTLS_SSL_DEBUG_BUF( 3, "server version", p, 2 ); - p += 2; - - /* If we get here, f_cookie_check is not null */ - if( ssl->conf->f_cookie_write == NULL ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "inconsistent cookie callbacks" ) ); - return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); - } - - /* Skip length byte until we know the length */ - cookie_len_byte = p++; - - if( ( ret = ssl->conf->f_cookie_write( ssl->conf->p_cookie, - &p, ssl->out_buf + MBEDTLS_SSL_OUT_BUFFER_LEN, - ssl->cli_id, ssl->cli_id_len ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "f_cookie_write", ret ); - return( ret ); - } - - *cookie_len_byte = (unsigned char)( p - ( cookie_len_byte + 1 ) ); - - MBEDTLS_SSL_DEBUG_BUF( 3, "cookie sent", cookie_len_byte + 1, *cookie_len_byte ); - - ssl->out_msglen = p - ssl->out_msg; - ssl->out_msgtype = MBEDTLS_SSL_MSG_HANDSHAKE; - ssl->out_msg[0] = MBEDTLS_SSL_HS_HELLO_VERIFY_REQUEST; - - ssl->state = MBEDTLS_SSL_SERVER_HELLO_VERIFY_REQUEST_SENT; - - if( ( ret = mbedtls_ssl_write_handshake_msg( ssl ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_write_handshake_msg", ret ); - return( ret ); - } - -#if defined(MBEDTLS_SSL_PROTO_DTLS) - if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM && - ( ret = mbedtls_ssl_flight_transmit( ssl ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_flight_transmit", ret ); - return( ret ); - } -#endif /* MBEDTLS_SSL_PROTO_DTLS */ - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= write hello verify request" ) ); - - return( 0 ); -} -#endif /* MBEDTLS_SSL_DTLS_HELLO_VERIFY */ - -static int ssl_write_server_hello( mbedtls_ssl_context *ssl ) -{ -#if defined(MBEDTLS_HAVE_TIME) - mbedtls_time_t t; -#endif - int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; - size_t olen, ext_len = 0, n; - unsigned char *buf, *p; - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> write server hello" ) ); - -#if defined(MBEDTLS_SSL_DTLS_HELLO_VERIFY) - if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM && - ssl->handshake->verify_cookie_len != 0 ) - { - MBEDTLS_SSL_DEBUG_MSG( 2, ( "client hello was not authenticated" ) ); - MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= write server hello" ) ); - - return( ssl_write_hello_verify_request( ssl ) ); - } -#endif /* MBEDTLS_SSL_DTLS_HELLO_VERIFY */ - - if( ssl->conf->f_rng == NULL ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "no RNG provided") ); - return( MBEDTLS_ERR_SSL_NO_RNG ); - } - - /* - * 0 . 0 handshake type - * 1 . 3 handshake length - * 4 . 5 protocol version - * 6 . 9 UNIX time() - * 10 . 37 random bytes - */ - buf = ssl->out_msg; - p = buf + 4; - - mbedtls_ssl_write_version( ssl->major_ver, ssl->minor_ver, - ssl->conf->transport, p ); - p += 2; - - MBEDTLS_SSL_DEBUG_MSG( 3, ( "server hello, chosen version: [%d:%d]", - buf[4], buf[5] ) ); - -#if defined(MBEDTLS_HAVE_TIME) - t = mbedtls_time( NULL ); - *p++ = (unsigned char)( t >> 24 ); - *p++ = (unsigned char)( t >> 16 ); - *p++ = (unsigned char)( t >> 8 ); - *p++ = (unsigned char)( t ); - - MBEDTLS_SSL_DEBUG_MSG( 3, ( "server hello, current time: %lu", t ) ); -#else - if( ( ret = ssl->conf->f_rng( ssl->conf->p_rng, p, 4 ) ) != 0 ) - return( ret ); - - p += 4; -#endif /* MBEDTLS_HAVE_TIME */ - - if( ( ret = ssl->conf->f_rng( ssl->conf->p_rng, p, 28 ) ) != 0 ) - return( ret ); - - p += 28; - - memcpy( ssl->handshake->randbytes + 32, buf + 6, 32 ); - - MBEDTLS_SSL_DEBUG_BUF( 3, "server hello, random bytes", buf + 6, 32 ); - - /* - * Resume is 0 by default, see ssl_handshake_init(). - * It may be already set to 1 by ssl_parse_session_ticket_ext(). - * If not, try looking up session ID in our cache. - */ - if( ssl->handshake->resume == 0 && -#if defined(MBEDTLS_SSL_RENEGOTIATION) - ssl->renego_status == MBEDTLS_SSL_INITIAL_HANDSHAKE && -#endif - ssl->session_negotiate->id_len != 0 && - ssl->conf->f_get_cache != NULL && - ssl->conf->f_get_cache( ssl->conf->p_cache, ssl->session_negotiate ) == 0 ) - { - MBEDTLS_SSL_DEBUG_MSG( 3, ( "session successfully restored from cache" ) ); - ssl->handshake->resume = 1; - } - - if( ssl->handshake->resume == 0 ) - { - /* - * New session, create a new session id, - * unless we're about to issue a session ticket - */ - ssl->state++; - -#if defined(MBEDTLS_HAVE_TIME) - ssl->session_negotiate->start = mbedtls_time( NULL ); -#endif - -#if defined(MBEDTLS_SSL_SESSION_TICKETS) - if( ssl->handshake->new_session_ticket != 0 ) - { - ssl->session_negotiate->id_len = n = 0; - memset( ssl->session_negotiate->id, 0, 32 ); - } - else -#endif /* MBEDTLS_SSL_SESSION_TICKETS */ - { - ssl->session_negotiate->id_len = n = 32; - if( ( ret = ssl->conf->f_rng( ssl->conf->p_rng, ssl->session_negotiate->id, - n ) ) != 0 ) - return( ret ); - } - } - else - { - /* - * Resuming a session - */ - n = ssl->session_negotiate->id_len; - ssl->state = MBEDTLS_SSL_SERVER_CHANGE_CIPHER_SPEC; - - if( ( ret = mbedtls_ssl_derive_keys( ssl ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_derive_keys", ret ); - return( ret ); - } - } - - /* - * 38 . 38 session id length - * 39 . 38+n session id - * 39+n . 40+n chosen ciphersuite - * 41+n . 41+n chosen compression alg. - * 42+n . 43+n extensions length - * 44+n . 43+n+m extensions - */ - *p++ = (unsigned char) ssl->session_negotiate->id_len; - memcpy( p, ssl->session_negotiate->id, ssl->session_negotiate->id_len ); - p += ssl->session_negotiate->id_len; - - MBEDTLS_SSL_DEBUG_MSG( 3, ( "server hello, session id len.: %d", n ) ); - MBEDTLS_SSL_DEBUG_BUF( 3, "server hello, session id", buf + 39, n ); - MBEDTLS_SSL_DEBUG_MSG( 3, ( "%s session has been resumed", - ssl->handshake->resume ? "a" : "no" ) ); - - *p++ = (unsigned char)( ssl->session_negotiate->ciphersuite >> 8 ); - *p++ = (unsigned char)( ssl->session_negotiate->ciphersuite ); - *p++ = (unsigned char)( ssl->session_negotiate->compression ); - - MBEDTLS_SSL_DEBUG_MSG( 3, ( "server hello, chosen ciphersuite: %s", - mbedtls_ssl_get_ciphersuite_name( ssl->session_negotiate->ciphersuite ) ) ); - MBEDTLS_SSL_DEBUG_MSG( 3, ( "server hello, compress alg.: 0x%02X", - ssl->session_negotiate->compression ) ); - - /* Do not write the extensions if the protocol is SSLv3 */ -#if defined(MBEDTLS_SSL_PROTO_SSL3) - if( ( ssl->major_ver != 3 ) || ( ssl->minor_ver != 0 ) ) - { -#endif - - /* - * First write extensions, then the total length - */ - ssl_write_renegotiation_ext( ssl, p + 2 + ext_len, &olen ); - ext_len += olen; - -#if defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH) - ssl_write_max_fragment_length_ext( ssl, p + 2 + ext_len, &olen ); - ext_len += olen; -#endif - -#if defined(MBEDTLS_SSL_TRUNCATED_HMAC) - ssl_write_truncated_hmac_ext( ssl, p + 2 + ext_len, &olen ); - ext_len += olen; -#endif - -#if defined(MBEDTLS_SSL_DTLS_CONNECTION_ID) - ssl_write_cid_ext( ssl, p + 2 + ext_len, &olen ); - ext_len += olen; -#endif - -#if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC) - ssl_write_encrypt_then_mac_ext( ssl, p + 2 + ext_len, &olen ); - ext_len += olen; -#endif - -#if defined(MBEDTLS_SSL_EXTENDED_MASTER_SECRET) - ssl_write_extended_ms_ext( ssl, p + 2 + ext_len, &olen ); - ext_len += olen; -#endif - -#if defined(MBEDTLS_SSL_SESSION_TICKETS) - ssl_write_session_ticket_ext( ssl, p + 2 + ext_len, &olen ); - ext_len += olen; -#endif - -#if defined(MBEDTLS_ECDH_C) || defined(MBEDTLS_ECDSA_C) || \ - defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED) - if ( mbedtls_ssl_ciphersuite_uses_ec( - mbedtls_ssl_ciphersuite_from_id( ssl->session_negotiate->ciphersuite ) ) ) - { - ssl_write_supported_point_formats_ext( ssl, p + 2 + ext_len, &olen ); - ext_len += olen; - } -#endif - -#if defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED) - ssl_write_ecjpake_kkpp_ext( ssl, p + 2 + ext_len, &olen ); - ext_len += olen; -#endif - -#if defined(MBEDTLS_SSL_ALPN) - ssl_write_alpn_ext( ssl, p + 2 + ext_len, &olen ); - ext_len += olen; -#endif - - MBEDTLS_SSL_DEBUG_MSG( 3, ( "server hello, total extension length: %d", ext_len ) ); - - if( ext_len > 0 ) - { - *p++ = (unsigned char)( ( ext_len >> 8 ) & 0xFF ); - *p++ = (unsigned char)( ( ext_len ) & 0xFF ); - p += ext_len; - } - -#if defined(MBEDTLS_SSL_PROTO_SSL3) - } -#endif - - ssl->out_msglen = p - buf; - ssl->out_msgtype = MBEDTLS_SSL_MSG_HANDSHAKE; - ssl->out_msg[0] = MBEDTLS_SSL_HS_SERVER_HELLO; - - ret = mbedtls_ssl_write_handshake_msg( ssl ); - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= write server hello" ) ); - - return( ret ); -} - -#if !defined(MBEDTLS_KEY_EXCHANGE__CERT_REQ_ALLOWED__ENABLED) -static int ssl_write_certificate_request( mbedtls_ssl_context *ssl ) -{ - const mbedtls_ssl_ciphersuite_t *ciphersuite_info = - ssl->handshake->ciphersuite_info; - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> write certificate request" ) ); - - if( !mbedtls_ssl_ciphersuite_cert_req_allowed( ciphersuite_info ) ) - { - MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= skip write certificate request" ) ); - ssl->state++; - return( 0 ); - } - - MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) ); - return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); -} -#else /* !MBEDTLS_KEY_EXCHANGE__CERT_REQ_ALLOWED__ENABLED */ -static int ssl_write_certificate_request( mbedtls_ssl_context *ssl ) -{ - int ret = MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE; - const mbedtls_ssl_ciphersuite_t *ciphersuite_info = - ssl->handshake->ciphersuite_info; - size_t dn_size, total_dn_size; /* excluding length bytes */ - size_t ct_len, sa_len; /* including length bytes */ - unsigned char *buf, *p; - const unsigned char * const end = ssl->out_msg + MBEDTLS_SSL_OUT_CONTENT_LEN; - const mbedtls_x509_crt *crt; - int authmode; - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> write certificate request" ) ); - - ssl->state++; - -#if defined(MBEDTLS_SSL_SERVER_NAME_INDICATION) - if( ssl->handshake->sni_authmode != MBEDTLS_SSL_VERIFY_UNSET ) - authmode = ssl->handshake->sni_authmode; - else -#endif - authmode = ssl->conf->authmode; - - if( !mbedtls_ssl_ciphersuite_cert_req_allowed( ciphersuite_info ) || - authmode == MBEDTLS_SSL_VERIFY_NONE ) - { - MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= skip write certificate request" ) ); - return( 0 ); - } - - /* - * 0 . 0 handshake type - * 1 . 3 handshake length - * 4 . 4 cert type count - * 5 .. m-1 cert types - * m .. m+1 sig alg length (TLS 1.2 only) - * m+1 .. n-1 SignatureAndHashAlgorithms (TLS 1.2 only) - * n .. n+1 length of all DNs - * n+2 .. n+3 length of DN 1 - * n+4 .. ... Distinguished Name #1 - * ... .. ... length of DN 2, etc. - */ - buf = ssl->out_msg; - p = buf + 4; - - /* - * Supported certificate types - * - * ClientCertificateType certificate_types<1..2^8-1>; - * enum { (255) } ClientCertificateType; - */ - ct_len = 0; - -#if defined(MBEDTLS_RSA_C) - p[1 + ct_len++] = MBEDTLS_SSL_CERT_TYPE_RSA_SIGN; -#endif -#if defined(MBEDTLS_ECDSA_C) - p[1 + ct_len++] = MBEDTLS_SSL_CERT_TYPE_ECDSA_SIGN; -#endif - - p[0] = (unsigned char) ct_len++; - p += ct_len; - - sa_len = 0; -#if defined(MBEDTLS_SSL_PROTO_TLS1_2) - /* - * Add signature_algorithms for verify (TLS 1.2) - * - * SignatureAndHashAlgorithm supported_signature_algorithms<2..2^16-2>; - * - * struct { - * HashAlgorithm hash; - * SignatureAlgorithm signature; - * } SignatureAndHashAlgorithm; - * - * enum { (255) } HashAlgorithm; - * enum { (255) } SignatureAlgorithm; - */ - if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_3 ) - { - const int *cur; - - /* - * Supported signature algorithms - */ - for( cur = ssl->conf->sig_hashes; *cur != MBEDTLS_MD_NONE; cur++ ) - { - unsigned char hash = mbedtls_ssl_hash_from_md_alg( *cur ); - - if( MBEDTLS_SSL_HASH_NONE == hash || mbedtls_ssl_set_calc_verify_md( ssl, hash ) ) - continue; - -#if defined(MBEDTLS_RSA_C) - p[2 + sa_len++] = hash; - p[2 + sa_len++] = MBEDTLS_SSL_SIG_RSA; -#endif -#if defined(MBEDTLS_ECDSA_C) - p[2 + sa_len++] = hash; - p[2 + sa_len++] = MBEDTLS_SSL_SIG_ECDSA; -#endif - } - - p[0] = (unsigned char)( sa_len >> 8 ); - p[1] = (unsigned char)( sa_len ); - sa_len += 2; - p += sa_len; - } -#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */ - - /* - * DistinguishedName certificate_authorities<0..2^16-1>; - * opaque DistinguishedName<1..2^16-1>; - */ - p += 2; - - total_dn_size = 0; - - if( ssl->conf->cert_req_ca_list == MBEDTLS_SSL_CERT_REQ_CA_LIST_ENABLED ) - { - /* NOTE: If trusted certificates are provisioned - * via a CA callback (configured through - * `mbedtls_ssl_conf_ca_cb()`, then the - * CertificateRequest is currently left empty. */ - -#if defined(MBEDTLS_SSL_SERVER_NAME_INDICATION) - if( ssl->handshake->sni_ca_chain != NULL ) - crt = ssl->handshake->sni_ca_chain; - else -#endif - crt = ssl->conf->ca_chain; - - while( crt != NULL && crt->version != 0 ) - { - dn_size = crt->subject_raw.len; - - if( end < p || - (size_t)( end - p ) < dn_size || - (size_t)( end - p ) < 2 + dn_size ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "skipping CAs: buffer too short" ) ); - break; - } - - *p++ = (unsigned char)( dn_size >> 8 ); - *p++ = (unsigned char)( dn_size ); - memcpy( p, crt->subject_raw.p, dn_size ); - p += dn_size; - - MBEDTLS_SSL_DEBUG_BUF( 3, "requested DN", p - dn_size, dn_size ); - - total_dn_size += 2 + dn_size; - crt = crt->next; - } - } - - ssl->out_msglen = p - buf; - ssl->out_msgtype = MBEDTLS_SSL_MSG_HANDSHAKE; - ssl->out_msg[0] = MBEDTLS_SSL_HS_CERTIFICATE_REQUEST; - ssl->out_msg[4 + ct_len + sa_len] = (unsigned char)( total_dn_size >> 8 ); - ssl->out_msg[5 + ct_len + sa_len] = (unsigned char)( total_dn_size ); - - ret = mbedtls_ssl_write_handshake_msg( ssl ); - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= write certificate request" ) ); - - return( ret ); -} -#endif /* MBEDTLS_KEY_EXCHANGE__CERT_REQ_ALLOWED__ENABLED */ - -#if defined(MBEDTLS_KEY_EXCHANGE_ECDH_RSA_ENABLED) || \ - defined(MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA_ENABLED) -static int ssl_get_ecdh_params_from_cert( mbedtls_ssl_context *ssl ) -{ - int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; - - if( ! mbedtls_pk_can_do( mbedtls_ssl_own_key( ssl ), MBEDTLS_PK_ECKEY ) ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "server key not ECDH capable" ) ); - return( MBEDTLS_ERR_SSL_PK_TYPE_MISMATCH ); - } - - if( ( ret = mbedtls_ecdh_get_params( &ssl->handshake->ecdh_ctx, - mbedtls_pk_ec( *mbedtls_ssl_own_key( ssl ) ), - MBEDTLS_ECDH_OURS ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, ( "mbedtls_ecdh_get_params" ), ret ); - return( ret ); - } - - return( 0 ); -} -#endif /* MBEDTLS_KEY_EXCHANGE_ECDH_RSA_ENABLED) || - MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA_ENABLED */ - -#if defined(MBEDTLS_KEY_EXCHANGE__WITH_SERVER_SIGNATURE__ENABLED) && \ - defined(MBEDTLS_SSL_ASYNC_PRIVATE) -static int ssl_resume_server_key_exchange( mbedtls_ssl_context *ssl, - size_t *signature_len ) -{ - /* Append the signature to ssl->out_msg, leaving 2 bytes for the - * signature length which will be added in ssl_write_server_key_exchange - * after the call to ssl_prepare_server_key_exchange. - * ssl_write_server_key_exchange also takes care of incrementing - * ssl->out_msglen. */ - unsigned char *sig_start = ssl->out_msg + ssl->out_msglen + 2; - size_t sig_max_len = ( ssl->out_buf + MBEDTLS_SSL_OUT_CONTENT_LEN - - sig_start ); - int ret = ssl->conf->f_async_resume( ssl, - sig_start, signature_len, sig_max_len ); - if( ret != MBEDTLS_ERR_SSL_ASYNC_IN_PROGRESS ) - { - ssl->handshake->async_in_progress = 0; - mbedtls_ssl_set_async_operation_data( ssl, NULL ); - } - MBEDTLS_SSL_DEBUG_RET( 2, "ssl_resume_server_key_exchange", ret ); - return( ret ); -} -#endif /* defined(MBEDTLS_KEY_EXCHANGE__WITH_SERVER_SIGNATURE__ENABLED) && - defined(MBEDTLS_SSL_ASYNC_PRIVATE) */ - -/* Prepare the ServerKeyExchange message, up to and including - * calculating the signature if any, but excluding formatting the - * signature and sending the message. */ -static int ssl_prepare_server_key_exchange( mbedtls_ssl_context *ssl, - size_t *signature_len ) -{ - const mbedtls_ssl_ciphersuite_t *ciphersuite_info = - ssl->handshake->ciphersuite_info; - -#if defined(MBEDTLS_KEY_EXCHANGE__SOME_PFS__ENABLED) -#if defined(MBEDTLS_KEY_EXCHANGE__WITH_SERVER_SIGNATURE__ENABLED) - unsigned char *dig_signed = NULL; -#endif /* MBEDTLS_KEY_EXCHANGE__WITH_SERVER_SIGNATURE__ENABLED */ -#endif /* MBEDTLS_KEY_EXCHANGE__SOME_PFS__ENABLED */ - - (void) ciphersuite_info; /* unused in some configurations */ -#if !defined(MBEDTLS_KEY_EXCHANGE__WITH_SERVER_SIGNATURE__ENABLED) - (void) signature_len; -#endif /* MBEDTLS_KEY_EXCHANGE__WITH_SERVER_SIGNATURE__ENABLED */ - - ssl->out_msglen = 4; /* header (type:1, length:3) to be written later */ - - /* - * - * Part 1: Provide key exchange parameters for chosen ciphersuite. - * - */ - - /* - * - ECJPAKE key exchanges - */ -#if defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED) - if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECJPAKE ) - { - int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; - size_t len = 0; - - ret = mbedtls_ecjpake_write_round_two( - &ssl->handshake->ecjpake_ctx, - ssl->out_msg + ssl->out_msglen, - MBEDTLS_SSL_OUT_CONTENT_LEN - ssl->out_msglen, &len, - ssl->conf->f_rng, ssl->conf->p_rng ); - if( ret != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ecjpake_write_round_two", ret ); - return( ret ); - } - - ssl->out_msglen += len; - } -#endif /* MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED */ - - /* - * For (EC)DHE key exchanges with PSK, parameters are prefixed by support - * identity hint (RFC 4279, Sec. 3). Until someone needs this feature, - * we use empty support identity hints here. - **/ -#if defined(MBEDTLS_KEY_EXCHANGE_DHE_PSK_ENABLED) || \ - defined(MBEDTLS_KEY_EXCHANGE_ECDHE_PSK_ENABLED) - if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_DHE_PSK || - ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDHE_PSK ) - { - ssl->out_msg[ssl->out_msglen++] = 0x00; - ssl->out_msg[ssl->out_msglen++] = 0x00; - } -#endif /* MBEDTLS_KEY_EXCHANGE_DHE_PSK_ENABLED || - MBEDTLS_KEY_EXCHANGE_ECDHE_PSK_ENABLED */ - - /* - * - DHE key exchanges - */ -#if defined(MBEDTLS_KEY_EXCHANGE__SOME__DHE_ENABLED) - if( mbedtls_ssl_ciphersuite_uses_dhe( ciphersuite_info ) ) - { - int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; - size_t len = 0; - - if( ssl->conf->dhm_P.p == NULL || ssl->conf->dhm_G.p == NULL ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "no DH parameters set" ) ); - return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); - } - - /* - * Ephemeral DH parameters: - * - * struct { - * opaque dh_p<1..2^16-1>; - * opaque dh_g<1..2^16-1>; - * opaque dh_Ys<1..2^16-1>; - * } ServerDHParams; - */ - if( ( ret = mbedtls_dhm_set_group( &ssl->handshake->dhm_ctx, - &ssl->conf->dhm_P, - &ssl->conf->dhm_G ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_dhm_set_group", ret ); - return( ret ); - } - - if( ( ret = mbedtls_dhm_make_params( - &ssl->handshake->dhm_ctx, - (int) mbedtls_mpi_size( &ssl->handshake->dhm_ctx.P ), - ssl->out_msg + ssl->out_msglen, &len, - ssl->conf->f_rng, ssl->conf->p_rng ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_dhm_make_params", ret ); - return( ret ); - } - -#if defined(MBEDTLS_KEY_EXCHANGE__WITH_SERVER_SIGNATURE__ENABLED) - dig_signed = ssl->out_msg + ssl->out_msglen; -#endif - - ssl->out_msglen += len; - - MBEDTLS_SSL_DEBUG_MPI( 3, "DHM: X ", &ssl->handshake->dhm_ctx.X ); - MBEDTLS_SSL_DEBUG_MPI( 3, "DHM: P ", &ssl->handshake->dhm_ctx.P ); - MBEDTLS_SSL_DEBUG_MPI( 3, "DHM: G ", &ssl->handshake->dhm_ctx.G ); - MBEDTLS_SSL_DEBUG_MPI( 3, "DHM: GX", &ssl->handshake->dhm_ctx.GX ); - } -#endif /* MBEDTLS_KEY_EXCHANGE__SOME__DHE_ENABLED */ - - /* - * - ECDHE key exchanges - */ -#if defined(MBEDTLS_KEY_EXCHANGE__SOME__ECDHE_ENABLED) - if( mbedtls_ssl_ciphersuite_uses_ecdhe( ciphersuite_info ) ) - { - /* - * Ephemeral ECDH parameters: - * - * struct { - * ECParameters curve_params; - * ECPoint public; - * } ServerECDHParams; - */ - const mbedtls_ecp_curve_info **curve = NULL; - const mbedtls_ecp_group_id *gid; - int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; - size_t len = 0; - - /* Match our preference list against the offered curves */ - for( gid = ssl->conf->curve_list; *gid != MBEDTLS_ECP_DP_NONE; gid++ ) - for( curve = ssl->handshake->curves; *curve != NULL; curve++ ) - if( (*curve)->grp_id == *gid ) - goto curve_matching_done; - -curve_matching_done: - if( curve == NULL || *curve == NULL ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "no matching curve for ECDHE" ) ); - return( MBEDTLS_ERR_SSL_NO_CIPHER_CHOSEN ); - } - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "ECDHE curve: %s", (*curve)->name ) ); - - if( ( ret = mbedtls_ecdh_setup( &ssl->handshake->ecdh_ctx, - (*curve)->grp_id ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ecp_group_load", ret ); - return( ret ); - } - - if( ( ret = mbedtls_ecdh_make_params( - &ssl->handshake->ecdh_ctx, &len, - ssl->out_msg + ssl->out_msglen, - MBEDTLS_SSL_OUT_CONTENT_LEN - ssl->out_msglen, - ssl->conf->f_rng, ssl->conf->p_rng ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ecdh_make_params", ret ); - return( ret ); - } - -#if defined(MBEDTLS_KEY_EXCHANGE__WITH_SERVER_SIGNATURE__ENABLED) - dig_signed = ssl->out_msg + ssl->out_msglen; -#endif - - ssl->out_msglen += len; - - MBEDTLS_SSL_DEBUG_ECDH( 3, &ssl->handshake->ecdh_ctx, - MBEDTLS_DEBUG_ECDH_Q ); - } -#endif /* MBEDTLS_KEY_EXCHANGE__SOME__ECDHE_ENABLED */ - - /* - * - * Part 2: For key exchanges involving the server signing the - * exchange parameters, compute and add the signature here. - * - */ -#if defined(MBEDTLS_KEY_EXCHANGE__WITH_SERVER_SIGNATURE__ENABLED) - if( mbedtls_ssl_ciphersuite_uses_server_signature( ciphersuite_info ) ) - { - size_t dig_signed_len = ssl->out_msg + ssl->out_msglen - dig_signed; - size_t hashlen = 0; - unsigned char hash[MBEDTLS_MD_MAX_SIZE]; - int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; - - /* - * 2.1: Choose hash algorithm: - * A: For TLS 1.2, obey signature-hash-algorithm extension - * to choose appropriate hash. - * B: For SSL3, TLS1.0, TLS1.1 and ECDHE_ECDSA, use SHA1 - * (RFC 4492, Sec. 5.4) - * C: Otherwise, use MD5 + SHA1 (RFC 4346, Sec. 7.4.3) - */ - - mbedtls_md_type_t md_alg; - -#if defined(MBEDTLS_SSL_PROTO_TLS1_2) - mbedtls_pk_type_t sig_alg = - mbedtls_ssl_get_ciphersuite_sig_pk_alg( ciphersuite_info ); - if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_3 ) - { - /* A: For TLS 1.2, obey signature-hash-algorithm extension - * (RFC 5246, Sec. 7.4.1.4.1). */ - if( sig_alg == MBEDTLS_PK_NONE || - ( md_alg = mbedtls_ssl_sig_hash_set_find( &ssl->handshake->hash_algs, - sig_alg ) ) == MBEDTLS_MD_NONE ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) ); - /* (... because we choose a cipher suite - * only if there is a matching hash.) */ - return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); - } - } - else -#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */ -#if defined(MBEDTLS_SSL_PROTO_SSL3) || defined(MBEDTLS_SSL_PROTO_TLS1) || \ - defined(MBEDTLS_SSL_PROTO_TLS1_1) - if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA ) - { - /* B: Default hash SHA1 */ - md_alg = MBEDTLS_MD_SHA1; - } - else -#endif /* MBEDTLS_SSL_PROTO_SSL3 || MBEDTLS_SSL_PROTO_TLS1 || \ - MBEDTLS_SSL_PROTO_TLS1_1 */ - { - /* C: MD5 + SHA1 */ - md_alg = MBEDTLS_MD_NONE; - } - - MBEDTLS_SSL_DEBUG_MSG( 3, ( "pick hash algorithm %d for signing", md_alg ) ); - - /* - * 2.2: Compute the hash to be signed - */ -#if defined(MBEDTLS_SSL_PROTO_SSL3) || defined(MBEDTLS_SSL_PROTO_TLS1) || \ - defined(MBEDTLS_SSL_PROTO_TLS1_1) - if( md_alg == MBEDTLS_MD_NONE ) - { - hashlen = 36; - ret = mbedtls_ssl_get_key_exchange_md_ssl_tls( ssl, hash, - dig_signed, - dig_signed_len ); - if( ret != 0 ) - return( ret ); - } - else -#endif /* MBEDTLS_SSL_PROTO_SSL3 || MBEDTLS_SSL_PROTO_TLS1 || \ - MBEDTLS_SSL_PROTO_TLS1_1 */ -#if defined(MBEDTLS_SSL_PROTO_TLS1) || defined(MBEDTLS_SSL_PROTO_TLS1_1) || \ - defined(MBEDTLS_SSL_PROTO_TLS1_2) - if( md_alg != MBEDTLS_MD_NONE ) - { - ret = mbedtls_ssl_get_key_exchange_md_tls1_2( ssl, hash, &hashlen, - dig_signed, - dig_signed_len, - md_alg ); - if( ret != 0 ) - return( ret ); - } - else -#endif /* MBEDTLS_SSL_PROTO_TLS1 || MBEDTLS_SSL_PROTO_TLS1_1 || \ - MBEDTLS_SSL_PROTO_TLS1_2 */ - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) ); - return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); - } - - MBEDTLS_SSL_DEBUG_BUF( 3, "parameters hash", hash, hashlen ); - - /* - * 2.3: Compute and add the signature - */ -#if defined(MBEDTLS_SSL_PROTO_TLS1_2) - if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_3 ) - { - /* - * For TLS 1.2, we need to specify signature and hash algorithm - * explicitly through a prefix to the signature. - * - * struct { - * HashAlgorithm hash; - * SignatureAlgorithm signature; - * } SignatureAndHashAlgorithm; - * - * struct { - * SignatureAndHashAlgorithm algorithm; - * opaque signature<0..2^16-1>; - * } DigitallySigned; - * - */ - - ssl->out_msg[ssl->out_msglen++] = - mbedtls_ssl_hash_from_md_alg( md_alg ); - ssl->out_msg[ssl->out_msglen++] = - mbedtls_ssl_sig_from_pk_alg( sig_alg ); - } -#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */ - -#if defined(MBEDTLS_SSL_ASYNC_PRIVATE) - if( ssl->conf->f_async_sign_start != NULL ) - { - ret = ssl->conf->f_async_sign_start( ssl, - mbedtls_ssl_own_cert( ssl ), - md_alg, hash, hashlen ); - switch( ret ) - { - case MBEDTLS_ERR_SSL_HW_ACCEL_FALLTHROUGH: - /* act as if f_async_sign was null */ - break; - case 0: - ssl->handshake->async_in_progress = 1; - return( ssl_resume_server_key_exchange( ssl, signature_len ) ); - case MBEDTLS_ERR_SSL_ASYNC_IN_PROGRESS: - ssl->handshake->async_in_progress = 1; - return( MBEDTLS_ERR_SSL_ASYNC_IN_PROGRESS ); - default: - MBEDTLS_SSL_DEBUG_RET( 1, "f_async_sign_start", ret ); - return( ret ); - } - } -#endif /* MBEDTLS_SSL_ASYNC_PRIVATE */ - - if( mbedtls_ssl_own_key( ssl ) == NULL ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "got no private key" ) ); - return( MBEDTLS_ERR_SSL_PRIVATE_KEY_REQUIRED ); - } - - /* Append the signature to ssl->out_msg, leaving 2 bytes for the - * signature length which will be added in ssl_write_server_key_exchange - * after the call to ssl_prepare_server_key_exchange. - * ssl_write_server_key_exchange also takes care of incrementing - * ssl->out_msglen. */ - if( ( ret = mbedtls_pk_sign( mbedtls_ssl_own_key( ssl ), - md_alg, hash, hashlen, - ssl->out_msg + ssl->out_msglen + 2, - signature_len, - ssl->conf->f_rng, - ssl->conf->p_rng ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_pk_sign", ret ); - return( ret ); - } - } -#endif /* MBEDTLS_KEY_EXCHANGE__WITH_SERVER_SIGNATURE__ENABLED */ - - return( 0 ); -} - -/* Prepare the ServerKeyExchange message and send it. For ciphersuites - * that do not include a ServerKeyExchange message, do nothing. Either - * way, if successful, move on to the next step in the SSL state - * machine. */ -static int ssl_write_server_key_exchange( mbedtls_ssl_context *ssl ) -{ - int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; - size_t signature_len = 0; -#if defined(MBEDTLS_KEY_EXCHANGE__SOME_NON_PFS__ENABLED) - const mbedtls_ssl_ciphersuite_t *ciphersuite_info = - ssl->handshake->ciphersuite_info; -#endif /* MBEDTLS_KEY_EXCHANGE__SOME_NON_PFS__ENABLED */ - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> write server key exchange" ) ); - -#if defined(MBEDTLS_KEY_EXCHANGE__SOME_NON_PFS__ENABLED) - /* Extract static ECDH parameters and abort if ServerKeyExchange - * is not needed. */ - if( mbedtls_ssl_ciphersuite_no_pfs( ciphersuite_info ) ) - { - /* For suites involving ECDH, extract DH parameters - * from certificate at this point. */ -#if defined(MBEDTLS_KEY_EXCHANGE__SOME__ECDH_ENABLED) - if( mbedtls_ssl_ciphersuite_uses_ecdh( ciphersuite_info ) ) - { - ssl_get_ecdh_params_from_cert( ssl ); - } -#endif /* MBEDTLS_KEY_EXCHANGE__SOME__ECDH_ENABLED */ - - /* Key exchanges not involving ephemeral keys don't use - * ServerKeyExchange, so end here. */ - MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= skip write server key exchange" ) ); - ssl->state++; - return( 0 ); - } -#endif /* MBEDTLS_KEY_EXCHANGE__SOME_NON_PFS__ENABLED */ - -#if defined(MBEDTLS_KEY_EXCHANGE__WITH_SERVER_SIGNATURE__ENABLED) && \ - defined(MBEDTLS_SSL_ASYNC_PRIVATE) - /* If we have already prepared the message and there is an ongoing - * signature operation, resume signing. */ - if( ssl->handshake->async_in_progress != 0 ) - { - MBEDTLS_SSL_DEBUG_MSG( 2, ( "resuming signature operation" ) ); - ret = ssl_resume_server_key_exchange( ssl, &signature_len ); - } - else -#endif /* defined(MBEDTLS_KEY_EXCHANGE__WITH_SERVER_SIGNATURE__ENABLED) && - defined(MBEDTLS_SSL_ASYNC_PRIVATE) */ - { - /* ServerKeyExchange is needed. Prepare the message. */ - ret = ssl_prepare_server_key_exchange( ssl, &signature_len ); - } - - if( ret != 0 ) - { - /* If we're starting to write a new message, set ssl->out_msglen - * to 0. But if we're resuming after an asynchronous message, - * out_msglen is the amount of data written so far and mst be - * preserved. */ - if( ret == MBEDTLS_ERR_SSL_ASYNC_IN_PROGRESS ) - MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= write server key exchange (pending)" ) ); - else - ssl->out_msglen = 0; - return( ret ); - } - - /* If there is a signature, write its length. - * ssl_prepare_server_key_exchange already wrote the signature - * itself at its proper place in the output buffer. */ -#if defined(MBEDTLS_KEY_EXCHANGE__WITH_SERVER_SIGNATURE__ENABLED) - if( signature_len != 0 ) - { - ssl->out_msg[ssl->out_msglen++] = (unsigned char)( signature_len >> 8 ); - ssl->out_msg[ssl->out_msglen++] = (unsigned char)( signature_len ); - - MBEDTLS_SSL_DEBUG_BUF( 3, "my signature", - ssl->out_msg + ssl->out_msglen, - signature_len ); - - /* Skip over the already-written signature */ - ssl->out_msglen += signature_len; - } -#endif /* MBEDTLS_KEY_EXCHANGE__WITH_SERVER_SIGNATURE__ENABLED */ - - /* Add header and send. */ - ssl->out_msgtype = MBEDTLS_SSL_MSG_HANDSHAKE; - ssl->out_msg[0] = MBEDTLS_SSL_HS_SERVER_KEY_EXCHANGE; - - ssl->state++; - - if( ( ret = mbedtls_ssl_write_handshake_msg( ssl ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_write_handshake_msg", ret ); - return( ret ); - } - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= write server key exchange" ) ); - return( 0 ); -} - -static int ssl_write_server_hello_done( mbedtls_ssl_context *ssl ) -{ - int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> write server hello done" ) ); - - ssl->out_msglen = 4; - ssl->out_msgtype = MBEDTLS_SSL_MSG_HANDSHAKE; - ssl->out_msg[0] = MBEDTLS_SSL_HS_SERVER_HELLO_DONE; - - ssl->state++; - -#if defined(MBEDTLS_SSL_PROTO_DTLS) - if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM ) - mbedtls_ssl_send_flight_completed( ssl ); -#endif - - if( ( ret = mbedtls_ssl_write_handshake_msg( ssl ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_write_handshake_msg", ret ); - return( ret ); - } - -#if defined(MBEDTLS_SSL_PROTO_DTLS) - if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM && - ( ret = mbedtls_ssl_flight_transmit( ssl ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_flight_transmit", ret ); - return( ret ); - } -#endif /* MBEDTLS_SSL_PROTO_DTLS */ - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= write server hello done" ) ); - - return( 0 ); -} - -#if defined(MBEDTLS_KEY_EXCHANGE_DHE_RSA_ENABLED) || \ - defined(MBEDTLS_KEY_EXCHANGE_DHE_PSK_ENABLED) -static int ssl_parse_client_dh_public( mbedtls_ssl_context *ssl, unsigned char **p, - const unsigned char *end ) -{ - int ret = MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE; - size_t n; - - /* - * Receive G^Y mod P, premaster = (G^Y)^X mod P - */ - if( *p + 2 > end ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client key exchange message" ) ); - return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE ); - } - - n = ( (*p)[0] << 8 ) | (*p)[1]; - *p += 2; - - if( *p + n > end ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client key exchange message" ) ); - return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE ); - } - - if( ( ret = mbedtls_dhm_read_public( &ssl->handshake->dhm_ctx, *p, n ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_dhm_read_public", ret ); - return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE_RP ); - } - - *p += n; - - MBEDTLS_SSL_DEBUG_MPI( 3, "DHM: GY", &ssl->handshake->dhm_ctx.GY ); - - return( ret ); -} -#endif /* MBEDTLS_KEY_EXCHANGE_DHE_RSA_ENABLED || - MBEDTLS_KEY_EXCHANGE_DHE_PSK_ENABLED */ - -#if defined(MBEDTLS_KEY_EXCHANGE_RSA_ENABLED) || \ - defined(MBEDTLS_KEY_EXCHANGE_RSA_PSK_ENABLED) - -#if defined(MBEDTLS_SSL_ASYNC_PRIVATE) -static int ssl_resume_decrypt_pms( mbedtls_ssl_context *ssl, - unsigned char *peer_pms, - size_t *peer_pmslen, - size_t peer_pmssize ) -{ - int ret = ssl->conf->f_async_resume( ssl, - peer_pms, peer_pmslen, peer_pmssize ); - if( ret != MBEDTLS_ERR_SSL_ASYNC_IN_PROGRESS ) - { - ssl->handshake->async_in_progress = 0; - mbedtls_ssl_set_async_operation_data( ssl, NULL ); - } - MBEDTLS_SSL_DEBUG_RET( 2, "ssl_decrypt_encrypted_pms", ret ); - return( ret ); -} -#endif /* MBEDTLS_SSL_ASYNC_PRIVATE */ - -static int ssl_decrypt_encrypted_pms( mbedtls_ssl_context *ssl, - const unsigned char *p, - const unsigned char *end, - unsigned char *peer_pms, - size_t *peer_pmslen, - size_t peer_pmssize ) -{ - int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; - mbedtls_pk_context *private_key = mbedtls_ssl_own_key( ssl ); - mbedtls_pk_context *public_key = &mbedtls_ssl_own_cert( ssl )->pk; - size_t len = mbedtls_pk_get_len( public_key ); - -#if defined(MBEDTLS_SSL_ASYNC_PRIVATE) - /* If we have already started decoding the message and there is an ongoing - * decryption operation, resume signing. */ - if( ssl->handshake->async_in_progress != 0 ) - { - MBEDTLS_SSL_DEBUG_MSG( 2, ( "resuming decryption operation" ) ); - return( ssl_resume_decrypt_pms( ssl, - peer_pms, peer_pmslen, peer_pmssize ) ); - } -#endif /* MBEDTLS_SSL_ASYNC_PRIVATE */ - - /* - * Prepare to decrypt the premaster using own private RSA key - */ -#if defined(MBEDTLS_SSL_PROTO_TLS1) || defined(MBEDTLS_SSL_PROTO_TLS1_1) || \ - defined(MBEDTLS_SSL_PROTO_TLS1_2) - if( ssl->minor_ver != MBEDTLS_SSL_MINOR_VERSION_0 ) - { - if ( p + 2 > end ) { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client key exchange message" ) ); - return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE ); - } - if( *p++ != ( ( len >> 8 ) & 0xFF ) || - *p++ != ( ( len ) & 0xFF ) ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client key exchange message" ) ); - return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE ); - } - } -#endif - - if( p + len != end ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client key exchange message" ) ); - return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE ); - } - - /* - * Decrypt the premaster secret - */ -#if defined(MBEDTLS_SSL_ASYNC_PRIVATE) - if( ssl->conf->f_async_decrypt_start != NULL ) - { - ret = ssl->conf->f_async_decrypt_start( ssl, - mbedtls_ssl_own_cert( ssl ), - p, len ); - switch( ret ) - { - case MBEDTLS_ERR_SSL_HW_ACCEL_FALLTHROUGH: - /* act as if f_async_decrypt_start was null */ - break; - case 0: - ssl->handshake->async_in_progress = 1; - return( ssl_resume_decrypt_pms( ssl, - peer_pms, - peer_pmslen, - peer_pmssize ) ); - case MBEDTLS_ERR_SSL_ASYNC_IN_PROGRESS: - ssl->handshake->async_in_progress = 1; - return( MBEDTLS_ERR_SSL_ASYNC_IN_PROGRESS ); - default: - MBEDTLS_SSL_DEBUG_RET( 1, "f_async_decrypt_start", ret ); - return( ret ); - } - } -#endif /* MBEDTLS_SSL_ASYNC_PRIVATE */ - - if( ! mbedtls_pk_can_do( private_key, MBEDTLS_PK_RSA ) ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "got no RSA private key" ) ); - return( MBEDTLS_ERR_SSL_PRIVATE_KEY_REQUIRED ); - } - - ret = mbedtls_pk_decrypt( private_key, p, len, - peer_pms, peer_pmslen, peer_pmssize, - ssl->conf->f_rng, ssl->conf->p_rng ); - return( ret ); -} - -static int ssl_parse_encrypted_pms( mbedtls_ssl_context *ssl, - const unsigned char *p, - const unsigned char *end, - size_t pms_offset ) -{ - int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; - unsigned char *pms = ssl->handshake->premaster + pms_offset; - unsigned char ver[2]; - unsigned char fake_pms[48], peer_pms[48]; - unsigned char mask; - size_t i, peer_pmslen; - unsigned int diff; - - /* In case of a failure in decryption, the decryption may write less than - * 2 bytes of output, but we always read the first two bytes. It doesn't - * matter in the end because diff will be nonzero in that case due to - * peer_pmslen being less than 48, and we only care whether diff is 0. - * But do initialize peer_pms for robustness anyway. This also makes - * memory analyzers happy (don't access uninitialized memory, even - * if it's an unsigned char). */ - peer_pms[0] = peer_pms[1] = ~0; - - ret = ssl_decrypt_encrypted_pms( ssl, p, end, - peer_pms, - &peer_pmslen, - sizeof( peer_pms ) ); - -#if defined(MBEDTLS_SSL_ASYNC_PRIVATE) - if ( ret == MBEDTLS_ERR_SSL_ASYNC_IN_PROGRESS ) - return( ret ); -#endif /* MBEDTLS_SSL_ASYNC_PRIVATE */ - - mbedtls_ssl_write_version( ssl->handshake->max_major_ver, - ssl->handshake->max_minor_ver, - ssl->conf->transport, ver ); - - /* Avoid data-dependent branches while checking for invalid - * padding, to protect against timing-based Bleichenbacher-type - * attacks. */ - diff = (unsigned int) ret; - diff |= peer_pmslen ^ 48; - diff |= peer_pms[0] ^ ver[0]; - diff |= peer_pms[1] ^ ver[1]; - - /* mask = diff ? 0xff : 0x00 using bit operations to avoid branches */ - /* MSVC has a warning about unary minus on unsigned, but this is - * well-defined and precisely what we want to do here */ -#if defined(_MSC_VER) -#pragma warning( push ) -#pragma warning( disable : 4146 ) -#endif - mask = - ( ( diff | - diff ) >> ( sizeof( unsigned int ) * 8 - 1 ) ); -#if defined(_MSC_VER) -#pragma warning( pop ) -#endif - - /* - * Protection against Bleichenbacher's attack: invalid PKCS#1 v1.5 padding - * must not cause the connection to end immediately; instead, send a - * bad_record_mac later in the handshake. - * To protect against timing-based variants of the attack, we must - * not have any branch that depends on whether the decryption was - * successful. In particular, always generate the fake premaster secret, - * regardless of whether it will ultimately influence the output or not. - */ - ret = ssl->conf->f_rng( ssl->conf->p_rng, fake_pms, sizeof( fake_pms ) ); - if( ret != 0 ) - { - /* It's ok to abort on an RNG failure, since this does not reveal - * anything about the RSA decryption. */ - return( ret ); - } - -#if defined(MBEDTLS_SSL_DEBUG_ALL) - if( diff != 0 ) - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client key exchange message" ) ); -#endif - - if( sizeof( ssl->handshake->premaster ) < pms_offset || - sizeof( ssl->handshake->premaster ) - pms_offset < 48 ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) ); - return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); - } - ssl->handshake->pmslen = 48; - - /* Set pms to either the true or the fake PMS, without - * data-dependent branches. */ - for( i = 0; i < ssl->handshake->pmslen; i++ ) - pms[i] = ( mask & fake_pms[i] ) | ( (~mask) & peer_pms[i] ); - - return( 0 ); -} -#endif /* MBEDTLS_KEY_EXCHANGE_RSA_ENABLED || - MBEDTLS_KEY_EXCHANGE_RSA_PSK_ENABLED */ - -#if defined(MBEDTLS_KEY_EXCHANGE__SOME__PSK_ENABLED) -static int ssl_parse_client_psk_identity( mbedtls_ssl_context *ssl, unsigned char **p, - const unsigned char *end ) -{ - int ret = 0; - size_t n; - - if( ssl_conf_has_psk_or_cb( ssl->conf ) == 0 ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "got no pre-shared key" ) ); - return( MBEDTLS_ERR_SSL_PRIVATE_KEY_REQUIRED ); - } - - /* - * Receive client pre-shared key identity name - */ - if( end - *p < 2 ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client key exchange message" ) ); - return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE ); - } - - n = ( (*p)[0] << 8 ) | (*p)[1]; - *p += 2; - - if( n < 1 || n > 65535 || n > (size_t) ( end - *p ) ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client key exchange message" ) ); - return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE ); - } - - if( ssl->conf->f_psk != NULL ) - { - if( ssl->conf->f_psk( ssl->conf->p_psk, ssl, *p, n ) != 0 ) - ret = MBEDTLS_ERR_SSL_UNKNOWN_IDENTITY; - } - else - { - /* Identity is not a big secret since clients send it in the clear, - * but treat it carefully anyway, just in case */ - if( n != ssl->conf->psk_identity_len || - mbedtls_ssl_safer_memcmp( ssl->conf->psk_identity, *p, n ) != 0 ) - { - ret = MBEDTLS_ERR_SSL_UNKNOWN_IDENTITY; - } - } - - if( ret == MBEDTLS_ERR_SSL_UNKNOWN_IDENTITY ) - { - MBEDTLS_SSL_DEBUG_BUF( 3, "Unknown PSK identity", *p, n ); - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_UNKNOWN_PSK_IDENTITY ); - return( MBEDTLS_ERR_SSL_UNKNOWN_IDENTITY ); - } - - *p += n; - - return( 0 ); -} -#endif /* MBEDTLS_KEY_EXCHANGE__SOME__PSK_ENABLED */ - -static int ssl_parse_client_key_exchange( mbedtls_ssl_context *ssl ) -{ - int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; - const mbedtls_ssl_ciphersuite_t *ciphersuite_info; - unsigned char *p, *end; - - ciphersuite_info = ssl->handshake->ciphersuite_info; - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> parse client key exchange" ) ); - -#if defined(MBEDTLS_SSL_ASYNC_PRIVATE) && \ - ( defined(MBEDTLS_KEY_EXCHANGE_RSA_ENABLED) || \ - defined(MBEDTLS_KEY_EXCHANGE_RSA_PSK_ENABLED) ) - if( ( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_RSA_PSK || - ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_RSA ) && - ( ssl->handshake->async_in_progress != 0 ) ) - { - /* We've already read a record and there is an asynchronous - * operation in progress to decrypt it. So skip reading the - * record. */ - MBEDTLS_SSL_DEBUG_MSG( 3, ( "will resume decryption of previously-read record" ) ); - } - else -#endif - if( ( ret = mbedtls_ssl_read_record( ssl, 1 ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_read_record", ret ); - return( ret ); - } - - p = ssl->in_msg + mbedtls_ssl_hs_hdr_len( ssl ); - end = ssl->in_msg + ssl->in_hslen; - - if( ssl->in_msgtype != MBEDTLS_SSL_MSG_HANDSHAKE ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client key exchange message" ) ); - return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE ); - } - - if( ssl->in_msg[0] != MBEDTLS_SSL_HS_CLIENT_KEY_EXCHANGE ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client key exchange message" ) ); - return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE ); - } - -#if defined(MBEDTLS_KEY_EXCHANGE_DHE_RSA_ENABLED) - if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_DHE_RSA ) - { - if( ( ret = ssl_parse_client_dh_public( ssl, &p, end ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, ( "ssl_parse_client_dh_public" ), ret ); - return( ret ); - } - - if( p != end ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client key exchange" ) ); - return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE ); - } - - if( ( ret = mbedtls_dhm_calc_secret( &ssl->handshake->dhm_ctx, - ssl->handshake->premaster, - MBEDTLS_PREMASTER_SIZE, - &ssl->handshake->pmslen, - ssl->conf->f_rng, ssl->conf->p_rng ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_dhm_calc_secret", ret ); - return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE_CS ); - } - - MBEDTLS_SSL_DEBUG_MPI( 3, "DHM: K ", &ssl->handshake->dhm_ctx.K ); - } - else -#endif /* MBEDTLS_KEY_EXCHANGE_DHE_RSA_ENABLED */ -#if defined(MBEDTLS_KEY_EXCHANGE_ECDHE_RSA_ENABLED) || \ - defined(MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED) || \ - defined(MBEDTLS_KEY_EXCHANGE_ECDH_RSA_ENABLED) || \ - defined(MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA_ENABLED) - if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDHE_RSA || - ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA || - ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDH_RSA || - ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA ) - { - if( ( ret = mbedtls_ecdh_read_public( &ssl->handshake->ecdh_ctx, - p, end - p) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ecdh_read_public", ret ); - return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE_RP ); - } - - MBEDTLS_SSL_DEBUG_ECDH( 3, &ssl->handshake->ecdh_ctx, - MBEDTLS_DEBUG_ECDH_QP ); - - if( ( ret = mbedtls_ecdh_calc_secret( &ssl->handshake->ecdh_ctx, - &ssl->handshake->pmslen, - ssl->handshake->premaster, - MBEDTLS_MPI_MAX_SIZE, - ssl->conf->f_rng, ssl->conf->p_rng ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ecdh_calc_secret", ret ); - return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE_CS ); - } - - MBEDTLS_SSL_DEBUG_ECDH( 3, &ssl->handshake->ecdh_ctx, - MBEDTLS_DEBUG_ECDH_Z ); - } - else -#endif /* MBEDTLS_KEY_EXCHANGE_ECDHE_RSA_ENABLED || - MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED || - MBEDTLS_KEY_EXCHANGE_ECDH_RSA_ENABLED || - MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA_ENABLED */ -#if defined(MBEDTLS_KEY_EXCHANGE_PSK_ENABLED) - if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_PSK ) - { - if( ( ret = ssl_parse_client_psk_identity( ssl, &p, end ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, ( "ssl_parse_client_psk_identity" ), ret ); - return( ret ); - } - - if( p != end ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client key exchange" ) ); - return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE ); - } - -#if defined(MBEDTLS_USE_PSA_CRYPTO) - /* For opaque PSKs, we perform the PSK-to-MS derivation atomatically - * and skip the intermediate PMS. */ - if( ssl_use_opaque_psk( ssl ) == 1 ) - MBEDTLS_SSL_DEBUG_MSG( 1, ( "skip PMS generation for opaque PSK" ) ); - else -#endif /* MBEDTLS_USE_PSA_CRYPTO */ - if( ( ret = mbedtls_ssl_psk_derive_premaster( ssl, - ciphersuite_info->key_exchange ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_psk_derive_premaster", ret ); - return( ret ); - } - } - else -#endif /* MBEDTLS_KEY_EXCHANGE_PSK_ENABLED */ -#if defined(MBEDTLS_KEY_EXCHANGE_RSA_PSK_ENABLED) - if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_RSA_PSK ) - { -#if defined(MBEDTLS_SSL_ASYNC_PRIVATE) - if ( ssl->handshake->async_in_progress != 0 ) - { - /* There is an asynchronous operation in progress to - * decrypt the encrypted premaster secret, so skip - * directly to resuming this operation. */ - MBEDTLS_SSL_DEBUG_MSG( 3, ( "PSK identity already parsed" ) ); - /* Update p to skip the PSK identity. ssl_parse_encrypted_pms - * won't actually use it, but maintain p anyway for robustness. */ - p += ssl->conf->psk_identity_len + 2; - } - else -#endif /* MBEDTLS_SSL_ASYNC_PRIVATE */ - if( ( ret = ssl_parse_client_psk_identity( ssl, &p, end ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, ( "ssl_parse_client_psk_identity" ), ret ); - return( ret ); - } - -#if defined(MBEDTLS_USE_PSA_CRYPTO) - /* Opaque PSKs are currently only supported for PSK-only. */ - if( ssl_use_opaque_psk( ssl ) == 1 ) - return( MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE ); -#endif - - if( ( ret = ssl_parse_encrypted_pms( ssl, p, end, 2 ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, ( "ssl_parse_encrypted_pms" ), ret ); - return( ret ); - } - - if( ( ret = mbedtls_ssl_psk_derive_premaster( ssl, - ciphersuite_info->key_exchange ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_psk_derive_premaster", ret ); - return( ret ); - } - } - else -#endif /* MBEDTLS_KEY_EXCHANGE_RSA_PSK_ENABLED */ -#if defined(MBEDTLS_KEY_EXCHANGE_DHE_PSK_ENABLED) - if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_DHE_PSK ) - { - if( ( ret = ssl_parse_client_psk_identity( ssl, &p, end ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, ( "ssl_parse_client_psk_identity" ), ret ); - return( ret ); - } - if( ( ret = ssl_parse_client_dh_public( ssl, &p, end ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, ( "ssl_parse_client_dh_public" ), ret ); - return( ret ); - } - -#if defined(MBEDTLS_USE_PSA_CRYPTO) - /* Opaque PSKs are currently only supported for PSK-only. */ - if( ssl_use_opaque_psk( ssl ) == 1 ) - return( MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE ); -#endif - - if( p != end ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client key exchange" ) ); - return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE ); - } - - if( ( ret = mbedtls_ssl_psk_derive_premaster( ssl, - ciphersuite_info->key_exchange ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_psk_derive_premaster", ret ); - return( ret ); - } - } - else -#endif /* MBEDTLS_KEY_EXCHANGE_DHE_PSK_ENABLED */ -#if defined(MBEDTLS_KEY_EXCHANGE_ECDHE_PSK_ENABLED) - if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDHE_PSK ) - { - if( ( ret = ssl_parse_client_psk_identity( ssl, &p, end ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, ( "ssl_parse_client_psk_identity" ), ret ); - return( ret ); - } - - if( ( ret = mbedtls_ecdh_read_public( &ssl->handshake->ecdh_ctx, - p, end - p ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ecdh_read_public", ret ); - return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE_RP ); - } - -#if defined(MBEDTLS_USE_PSA_CRYPTO) - /* Opaque PSKs are currently only supported for PSK-only. */ - if( ssl_use_opaque_psk( ssl ) == 1 ) - return( MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE ); -#endif - - MBEDTLS_SSL_DEBUG_ECDH( 3, &ssl->handshake->ecdh_ctx, - MBEDTLS_DEBUG_ECDH_QP ); - - if( ( ret = mbedtls_ssl_psk_derive_premaster( ssl, - ciphersuite_info->key_exchange ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_psk_derive_premaster", ret ); - return( ret ); - } - } - else -#endif /* MBEDTLS_KEY_EXCHANGE_ECDHE_PSK_ENABLED */ -#if defined(MBEDTLS_KEY_EXCHANGE_RSA_ENABLED) - if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_RSA ) - { - if( ( ret = ssl_parse_encrypted_pms( ssl, p, end, 0 ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, ( "ssl_parse_parse_encrypted_pms_secret" ), ret ); - return( ret ); - } - } - else -#endif /* MBEDTLS_KEY_EXCHANGE_RSA_ENABLED */ -#if defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED) - if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECJPAKE ) - { - ret = mbedtls_ecjpake_read_round_two( &ssl->handshake->ecjpake_ctx, - p, end - p ); - if( ret != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ecjpake_read_round_two", ret ); - return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_KEY_EXCHANGE ); - } - - ret = mbedtls_ecjpake_derive_secret( &ssl->handshake->ecjpake_ctx, - ssl->handshake->premaster, 32, &ssl->handshake->pmslen, - ssl->conf->f_rng, ssl->conf->p_rng ); - if( ret != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ecjpake_derive_secret", ret ); - return( ret ); - } - } - else -#endif /* MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED */ - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) ); - return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); - } - - if( ( ret = mbedtls_ssl_derive_keys( ssl ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_derive_keys", ret ); - return( ret ); - } - - ssl->state++; - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= parse client key exchange" ) ); - - return( 0 ); -} - -#if !defined(MBEDTLS_KEY_EXCHANGE__CERT_REQ_ALLOWED__ENABLED) -static int ssl_parse_certificate_verify( mbedtls_ssl_context *ssl ) -{ - const mbedtls_ssl_ciphersuite_t *ciphersuite_info = - ssl->handshake->ciphersuite_info; - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> parse certificate verify" ) ); - - if( !mbedtls_ssl_ciphersuite_cert_req_allowed( ciphersuite_info ) ) - { - MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= skip parse certificate verify" ) ); - ssl->state++; - return( 0 ); - } - - MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) ); - return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); -} -#else /* !MBEDTLS_KEY_EXCHANGE__CERT_REQ_ALLOWED__ENABLED */ -static int ssl_parse_certificate_verify( mbedtls_ssl_context *ssl ) -{ - int ret = MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE; - size_t i, sig_len; - unsigned char hash[48]; - unsigned char *hash_start = hash; - size_t hashlen; -#if defined(MBEDTLS_SSL_PROTO_TLS1_2) - mbedtls_pk_type_t pk_alg; -#endif - mbedtls_md_type_t md_alg; - const mbedtls_ssl_ciphersuite_t *ciphersuite_info = - ssl->handshake->ciphersuite_info; - mbedtls_pk_context * peer_pk; - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> parse certificate verify" ) ); - - if( !mbedtls_ssl_ciphersuite_cert_req_allowed( ciphersuite_info ) ) - { - MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= skip parse certificate verify" ) ); - ssl->state++; - return( 0 ); - } - -#if defined(MBEDTLS_SSL_KEEP_PEER_CERTIFICATE) - if( ssl->session_negotiate->peer_cert == NULL ) - { - MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= skip parse certificate verify" ) ); - ssl->state++; - return( 0 ); - } -#else /* MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */ - if( ssl->session_negotiate->peer_cert_digest == NULL ) - { - MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= skip parse certificate verify" ) ); - ssl->state++; - return( 0 ); - } -#endif /* !MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */ - - /* Read the message without adding it to the checksum */ - ret = mbedtls_ssl_read_record( ssl, 0 /* no checksum update */ ); - if( 0 != ret ) - { - MBEDTLS_SSL_DEBUG_RET( 1, ( "mbedtls_ssl_read_record" ), ret ); - return( ret ); - } - - ssl->state++; - - /* Process the message contents */ - if( ssl->in_msgtype != MBEDTLS_SSL_MSG_HANDSHAKE || - ssl->in_msg[0] != MBEDTLS_SSL_HS_CERTIFICATE_VERIFY ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad certificate verify message" ) ); - return( MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE_VERIFY ); - } - - i = mbedtls_ssl_hs_hdr_len( ssl ); - -#if !defined(MBEDTLS_SSL_KEEP_PEER_CERTIFICATE) - peer_pk = &ssl->handshake->peer_pubkey; -#else /* !MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */ - if( ssl->session_negotiate->peer_cert == NULL ) - { - /* Should never happen */ - return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); - } - peer_pk = &ssl->session_negotiate->peer_cert->pk; -#endif /* MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */ - - /* - * struct { - * SignatureAndHashAlgorithm algorithm; -- TLS 1.2 only - * opaque signature<0..2^16-1>; - * } DigitallySigned; - */ -#if defined(MBEDTLS_SSL_PROTO_SSL3) || defined(MBEDTLS_SSL_PROTO_TLS1) || \ - defined(MBEDTLS_SSL_PROTO_TLS1_1) - if( ssl->minor_ver != MBEDTLS_SSL_MINOR_VERSION_3 ) - { - md_alg = MBEDTLS_MD_NONE; - hashlen = 36; - - /* For ECDSA, use SHA-1, not MD-5 + SHA-1 */ - if( mbedtls_pk_can_do( peer_pk, MBEDTLS_PK_ECDSA ) ) - { - hash_start += 16; - hashlen -= 16; - md_alg = MBEDTLS_MD_SHA1; - } - } - else -#endif /* MBEDTLS_SSL_PROTO_SSL3 || MBEDTLS_SSL_PROTO_TLS1 || - MBEDTLS_SSL_PROTO_TLS1_1 */ -#if defined(MBEDTLS_SSL_PROTO_TLS1_2) - if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_3 ) - { - if( i + 2 > ssl->in_hslen ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad certificate verify message" ) ); - return( MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE_VERIFY ); - } - - /* - * Hash - */ - md_alg = mbedtls_ssl_md_alg_from_hash( ssl->in_msg[i] ); - - if( md_alg == MBEDTLS_MD_NONE || mbedtls_ssl_set_calc_verify_md( ssl, ssl->in_msg[i] ) ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "peer not adhering to requested sig_alg" - " for verify message" ) ); - return( MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE_VERIFY ); - } - -#if !defined(MBEDTLS_MD_SHA1) - if( MBEDTLS_MD_SHA1 == md_alg ) - hash_start += 16; -#endif - - /* Info from md_alg will be used instead */ - hashlen = 0; - - i++; - - /* - * Signature - */ - if( ( pk_alg = mbedtls_ssl_pk_alg_from_sig( ssl->in_msg[i] ) ) - == MBEDTLS_PK_NONE ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "peer not adhering to requested sig_alg" - " for verify message" ) ); - return( MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE_VERIFY ); - } - - /* - * Check the certificate's key type matches the signature alg - */ - if( !mbedtls_pk_can_do( peer_pk, pk_alg ) ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "sig_alg doesn't match cert key" ) ); - return( MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE_VERIFY ); - } - - i++; - } - else -#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */ - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) ); - return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); - } - - if( i + 2 > ssl->in_hslen ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad certificate verify message" ) ); - return( MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE_VERIFY ); - } - - sig_len = ( ssl->in_msg[i] << 8 ) | ssl->in_msg[i+1]; - i += 2; - - if( i + sig_len != ssl->in_hslen ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad certificate verify message" ) ); - return( MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE_VERIFY ); - } - - /* Calculate hash and verify signature */ - { - size_t dummy_hlen; - ssl->handshake->calc_verify( ssl, hash, &dummy_hlen ); - } - - if( ( ret = mbedtls_pk_verify( peer_pk, - md_alg, hash_start, hashlen, - ssl->in_msg + i, sig_len ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_pk_verify", ret ); - return( ret ); - } - - mbedtls_ssl_update_handshake_status( ssl ); - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= parse certificate verify" ) ); - - return( ret ); -} -#endif /* MBEDTLS_KEY_EXCHANGE__CERT_REQ_ALLOWED__ENABLED */ - -#if defined(MBEDTLS_SSL_SESSION_TICKETS) -static int ssl_write_new_session_ticket( mbedtls_ssl_context *ssl ) -{ - int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; - size_t tlen; - uint32_t lifetime; - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> write new session ticket" ) ); - - ssl->out_msgtype = MBEDTLS_SSL_MSG_HANDSHAKE; - ssl->out_msg[0] = MBEDTLS_SSL_HS_NEW_SESSION_TICKET; - - /* - * struct { - * uint32 ticket_lifetime_hint; - * opaque ticket<0..2^16-1>; - * } NewSessionTicket; - * - * 4 . 7 ticket_lifetime_hint (0 = unspecified) - * 8 . 9 ticket_len (n) - * 10 . 9+n ticket content - */ - - if( ( ret = ssl->conf->f_ticket_write( ssl->conf->p_ticket, - ssl->session_negotiate, - ssl->out_msg + 10, - ssl->out_msg + MBEDTLS_SSL_OUT_CONTENT_LEN, - &tlen, &lifetime ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_ticket_write", ret ); - tlen = 0; - } - - ssl->out_msg[4] = ( lifetime >> 24 ) & 0xFF; - ssl->out_msg[5] = ( lifetime >> 16 ) & 0xFF; - ssl->out_msg[6] = ( lifetime >> 8 ) & 0xFF; - ssl->out_msg[7] = ( lifetime ) & 0xFF; - - ssl->out_msg[8] = (unsigned char)( ( tlen >> 8 ) & 0xFF ); - ssl->out_msg[9] = (unsigned char)( ( tlen ) & 0xFF ); - - ssl->out_msglen = 10 + tlen; - - /* - * Morally equivalent to updating ssl->state, but NewSessionTicket and - * ChangeCipherSpec share the same state. - */ - ssl->handshake->new_session_ticket = 0; - - if( ( ret = mbedtls_ssl_write_handshake_msg( ssl ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_write_handshake_msg", ret ); - return( ret ); - } - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= write new session ticket" ) ); - - return( 0 ); -} -#endif /* MBEDTLS_SSL_SESSION_TICKETS */ - -/* - * SSL handshake -- server side -- single step - */ -int mbedtls_ssl_handshake_server_step( mbedtls_ssl_context *ssl ) -{ - int ret = 0; - - if( ssl->state == MBEDTLS_SSL_HANDSHAKE_OVER || ssl->handshake == NULL ) - return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "server state: %d", ssl->state ) ); - - if( ( ret = mbedtls_ssl_flush_output( ssl ) ) != 0 ) - return( ret ); - -#if defined(MBEDTLS_SSL_PROTO_DTLS) - if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM && - ssl->handshake->retransmit_state == MBEDTLS_SSL_RETRANS_SENDING ) - { - if( ( ret = mbedtls_ssl_flight_transmit( ssl ) ) != 0 ) - return( ret ); - } -#endif /* MBEDTLS_SSL_PROTO_DTLS */ - - switch( ssl->state ) - { - case MBEDTLS_SSL_HELLO_REQUEST: - ssl->state = MBEDTLS_SSL_CLIENT_HELLO; - break; - - /* - * <== ClientHello - */ - case MBEDTLS_SSL_CLIENT_HELLO: - ret = ssl_parse_client_hello( ssl ); - break; - -#if defined(MBEDTLS_SSL_PROTO_DTLS) - case MBEDTLS_SSL_SERVER_HELLO_VERIFY_REQUEST_SENT: - return( MBEDTLS_ERR_SSL_HELLO_VERIFY_REQUIRED ); -#endif - - /* - * ==> ServerHello - * Certificate - * ( ServerKeyExchange ) - * ( CertificateRequest ) - * ServerHelloDone - */ - case MBEDTLS_SSL_SERVER_HELLO: - ret = ssl_write_server_hello( ssl ); - break; - - case MBEDTLS_SSL_SERVER_CERTIFICATE: - ret = mbedtls_ssl_write_certificate( ssl ); - break; - - case MBEDTLS_SSL_SERVER_KEY_EXCHANGE: - ret = ssl_write_server_key_exchange( ssl ); - break; - - case MBEDTLS_SSL_CERTIFICATE_REQUEST: - ret = ssl_write_certificate_request( ssl ); - break; - - case MBEDTLS_SSL_SERVER_HELLO_DONE: - ret = ssl_write_server_hello_done( ssl ); - break; - - /* - * <== ( Certificate/Alert ) - * ClientKeyExchange - * ( CertificateVerify ) - * ChangeCipherSpec - * Finished - */ - case MBEDTLS_SSL_CLIENT_CERTIFICATE: - ret = mbedtls_ssl_parse_certificate( ssl ); - break; - - case MBEDTLS_SSL_CLIENT_KEY_EXCHANGE: - ret = ssl_parse_client_key_exchange( ssl ); - break; - - case MBEDTLS_SSL_CERTIFICATE_VERIFY: - ret = ssl_parse_certificate_verify( ssl ); - break; - - case MBEDTLS_SSL_CLIENT_CHANGE_CIPHER_SPEC: - ret = mbedtls_ssl_parse_change_cipher_spec( ssl ); - break; - - case MBEDTLS_SSL_CLIENT_FINISHED: - ret = mbedtls_ssl_parse_finished( ssl ); - break; - - /* - * ==> ( NewSessionTicket ) - * ChangeCipherSpec - * Finished - */ - case MBEDTLS_SSL_SERVER_CHANGE_CIPHER_SPEC: -#if defined(MBEDTLS_SSL_SESSION_TICKETS) - if( ssl->handshake->new_session_ticket != 0 ) - ret = ssl_write_new_session_ticket( ssl ); - else -#endif - ret = mbedtls_ssl_write_change_cipher_spec( ssl ); - break; - - case MBEDTLS_SSL_SERVER_FINISHED: - ret = mbedtls_ssl_write_finished( ssl ); - break; - - case MBEDTLS_SSL_FLUSH_BUFFERS: - MBEDTLS_SSL_DEBUG_MSG( 2, ( "handshake: done" ) ); - ssl->state = MBEDTLS_SSL_HANDSHAKE_WRAPUP; - break; - - case MBEDTLS_SSL_HANDSHAKE_WRAPUP: - mbedtls_ssl_handshake_wrapup( ssl ); - break; - - default: - MBEDTLS_SSL_DEBUG_MSG( 1, ( "invalid state %d", ssl->state ) ); - return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); - } - - return( ret ); -} #endif /* MBEDTLS_SSL_SRV_C */ diff --git a/library/ssl_tls.c b/library/ssl_tls.c index ab9cb8986..49f65f974 100644 --- a/library/ssl_tls.c +++ b/library/ssl_tls.c @@ -1943,51 +1943,6 @@ int mbedtls_ssl_psk_derive_premaster( mbedtls_ssl_context *ssl, mbedtls_key_exch } #endif /* MBEDTLS_KEY_EXCHANGE__SOME__PSK_ENABLED */ -#if defined(MBEDTLS_SSL_PROTO_SSL3) -/* - * SSLv3.0 MAC functions - */ -#define SSL_MAC_MAX_BYTES 20 /* MD-5 or SHA-1 */ -static void ssl_mac( mbedtls_md_context_t *md_ctx, - const unsigned char *secret, - const unsigned char *buf, size_t len, - const unsigned char *ctr, int type, - unsigned char out[SSL_MAC_MAX_BYTES] ) -{ - unsigned char header[11]; - unsigned char padding[48]; - int padlen; - int md_size = mbedtls_md_get_size( md_ctx->md_info ); - int md_type = mbedtls_md_get_type( md_ctx->md_info ); - - /* Only MD5 and SHA-1 supported */ - if( md_type == MBEDTLS_MD_MD5 ) - padlen = 48; - else - padlen = 40; - - memcpy( header, ctr, 8 ); - header[ 8] = (unsigned char) type; - header[ 9] = (unsigned char)( len >> 8 ); - header[10] = (unsigned char)( len ); - - memset( padding, 0x36, padlen ); - mbedtls_md_starts( md_ctx ); - mbedtls_md_update( md_ctx, secret, md_size ); - mbedtls_md_update( md_ctx, padding, padlen ); - mbedtls_md_update( md_ctx, header, 11 ); - mbedtls_md_update( md_ctx, buf, len ); - mbedtls_md_finish( md_ctx, out ); - - memset( padding, 0x5C, padlen ); - mbedtls_md_starts( md_ctx ); - mbedtls_md_update( md_ctx, secret, md_size ); - mbedtls_md_update( md_ctx, padding, padlen ); - mbedtls_md_update( md_ctx, out, md_size ); - mbedtls_md_finish( md_ctx, out ); -} -#endif /* MBEDTLS_SSL_PROTO_SSL3 */ - #if defined(MBEDTLS_SSL_SRV_C) && defined(MBEDTLS_SSL_RENEGOTIATION) static int ssl_write_hello_request( mbedtls_ssl_context *ssl ); @@ -2020,7 +1975,7 @@ int mbedtls_ssl_resend_hello_request( mbedtls_ssl_context *ssl ) #endif /* MBEDTLS_SSL_SRV_C && MBEDTLS_SSL_RENEGOTIATION */ #if defined(MBEDTLS_X509_CRT_PARSE_C) -static void ssl_clear_peer_cert( mbedtls_ssl_session *session ) +void mbedtls_ssl_clear_peer_cert( mbedtls_ssl_session *session ) { #if defined(MBEDTLS_SSL_KEEP_PEER_CERTIFICATE) if( session->peer_cert != NULL ) @@ -2045,830 +2000,6 @@ static void ssl_clear_peer_cert( mbedtls_ssl_session *session ) /* * Handshake functions */ -#if !defined(MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED) -/* No certificate support -> dummy functions */ -int mbedtls_ssl_write_certificate( mbedtls_ssl_context *ssl ) -{ - const mbedtls_ssl_ciphersuite_t *ciphersuite_info = - ssl->handshake->ciphersuite_info; - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> write certificate" ) ); - - if( !mbedtls_ssl_ciphersuite_uses_srv_cert( ciphersuite_info ) ) - { - MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= skip write certificate" ) ); - ssl->state++; - return( 0 ); - } - - MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) ); - return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); -} - -int mbedtls_ssl_parse_certificate( mbedtls_ssl_context *ssl ) -{ - const mbedtls_ssl_ciphersuite_t *ciphersuite_info = - ssl->handshake->ciphersuite_info; - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> parse certificate" ) ); - - if( !mbedtls_ssl_ciphersuite_uses_srv_cert( ciphersuite_info ) ) - { - MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= skip parse certificate" ) ); - ssl->state++; - return( 0 ); - } - - MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) ); - return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); -} - -#else /* MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED */ -/* Some certificate support -> implement write and parse */ - -int mbedtls_ssl_write_certificate( mbedtls_ssl_context *ssl ) -{ - int ret = MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE; - size_t i, n; - const mbedtls_x509_crt *crt; - const mbedtls_ssl_ciphersuite_t *ciphersuite_info = - ssl->handshake->ciphersuite_info; - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> write certificate" ) ); - - if( !mbedtls_ssl_ciphersuite_uses_srv_cert( ciphersuite_info ) ) - { - MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= skip write certificate" ) ); - ssl->state++; - return( 0 ); - } - -#if defined(MBEDTLS_SSL_CLI_C) - if( ssl->conf->endpoint == MBEDTLS_SSL_IS_CLIENT ) - { - if( ssl->client_auth == 0 ) - { - MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= skip write certificate" ) ); - ssl->state++; - return( 0 ); - } - -#if defined(MBEDTLS_SSL_PROTO_SSL3) - /* - * If using SSLv3 and got no cert, send an Alert message - * (otherwise an empty Certificate message will be sent). - */ - if( mbedtls_ssl_own_cert( ssl ) == NULL && - ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 ) - { - ssl->out_msglen = 2; - ssl->out_msgtype = MBEDTLS_SSL_MSG_ALERT; - ssl->out_msg[0] = MBEDTLS_SSL_ALERT_LEVEL_WARNING; - ssl->out_msg[1] = MBEDTLS_SSL_ALERT_MSG_NO_CERT; - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "got no certificate to send" ) ); - goto write_msg; - } -#endif /* MBEDTLS_SSL_PROTO_SSL3 */ - } -#endif /* MBEDTLS_SSL_CLI_C */ -#if defined(MBEDTLS_SSL_SRV_C) - if( ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER ) - { - if( mbedtls_ssl_own_cert( ssl ) == NULL ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "got no certificate to send" ) ); - return( MBEDTLS_ERR_SSL_CERTIFICATE_REQUIRED ); - } - } -#endif - - MBEDTLS_SSL_DEBUG_CRT( 3, "own certificate", mbedtls_ssl_own_cert( ssl ) ); - - /* - * 0 . 0 handshake type - * 1 . 3 handshake length - * 4 . 6 length of all certs - * 7 . 9 length of cert. 1 - * 10 . n-1 peer certificate - * n . n+2 length of cert. 2 - * n+3 . ... upper level cert, etc. - */ - i = 7; - crt = mbedtls_ssl_own_cert( ssl ); - - while( crt != NULL ) - { - n = crt->raw.len; - if( n > MBEDTLS_SSL_OUT_CONTENT_LEN - 3 - i ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "certificate too large, %d > %d", - i + 3 + n, MBEDTLS_SSL_OUT_CONTENT_LEN ) ); - return( MBEDTLS_ERR_SSL_CERTIFICATE_TOO_LARGE ); - } - - ssl->out_msg[i ] = (unsigned char)( n >> 16 ); - ssl->out_msg[i + 1] = (unsigned char)( n >> 8 ); - ssl->out_msg[i + 2] = (unsigned char)( n ); - - i += 3; memcpy( ssl->out_msg + i, crt->raw.p, n ); - i += n; crt = crt->next; - } - - ssl->out_msg[4] = (unsigned char)( ( i - 7 ) >> 16 ); - ssl->out_msg[5] = (unsigned char)( ( i - 7 ) >> 8 ); - ssl->out_msg[6] = (unsigned char)( ( i - 7 ) ); - - ssl->out_msglen = i; - ssl->out_msgtype = MBEDTLS_SSL_MSG_HANDSHAKE; - ssl->out_msg[0] = MBEDTLS_SSL_HS_CERTIFICATE; - -#if defined(MBEDTLS_SSL_PROTO_SSL3) && defined(MBEDTLS_SSL_CLI_C) -write_msg: -#endif - - ssl->state++; - - if( ( ret = mbedtls_ssl_write_handshake_msg( ssl ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_write_handshake_msg", ret ); - return( ret ); - } - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= write certificate" ) ); - - return( ret ); -} - -#if defined(MBEDTLS_SSL_RENEGOTIATION) && defined(MBEDTLS_SSL_CLI_C) - -#if defined(MBEDTLS_SSL_KEEP_PEER_CERTIFICATE) -static int ssl_check_peer_crt_unchanged( mbedtls_ssl_context *ssl, - unsigned char *crt_buf, - size_t crt_buf_len ) -{ - mbedtls_x509_crt const * const peer_crt = ssl->session->peer_cert; - - if( peer_crt == NULL ) - return( -1 ); - - if( peer_crt->raw.len != crt_buf_len ) - return( -1 ); - - return( memcmp( peer_crt->raw.p, crt_buf, peer_crt->raw.len ) ); -} -#else /* MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */ -static int ssl_check_peer_crt_unchanged( mbedtls_ssl_context *ssl, - unsigned char *crt_buf, - size_t crt_buf_len ) -{ - int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; - unsigned char const * const peer_cert_digest = - ssl->session->peer_cert_digest; - mbedtls_md_type_t const peer_cert_digest_type = - ssl->session->peer_cert_digest_type; - mbedtls_md_info_t const * const digest_info = - mbedtls_md_info_from_type( peer_cert_digest_type ); - unsigned char tmp_digest[MBEDTLS_SSL_PEER_CERT_DIGEST_MAX_LEN]; - size_t digest_len; - - if( peer_cert_digest == NULL || digest_info == NULL ) - return( -1 ); - - digest_len = mbedtls_md_get_size( digest_info ); - if( digest_len > MBEDTLS_SSL_PEER_CERT_DIGEST_MAX_LEN ) - return( -1 ); - - ret = mbedtls_md( digest_info, crt_buf, crt_buf_len, tmp_digest ); - if( ret != 0 ) - return( -1 ); - - return( memcmp( tmp_digest, peer_cert_digest, digest_len ) ); -} -#endif /* MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */ -#endif /* MBEDTLS_SSL_RENEGOTIATION && MBEDTLS_SSL_CLI_C */ - -/* - * Once the certificate message is read, parse it into a cert chain and - * perform basic checks, but leave actual verification to the caller - */ -static int ssl_parse_certificate_chain( mbedtls_ssl_context *ssl, - mbedtls_x509_crt *chain ) -{ - int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; -#if defined(MBEDTLS_SSL_RENEGOTIATION) && defined(MBEDTLS_SSL_CLI_C) - int crt_cnt=0; -#endif - size_t i, n; - uint8_t alert; - - if( ssl->in_msgtype != MBEDTLS_SSL_MSG_HANDSHAKE ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad certificate message" ) ); - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_UNEXPECTED_MESSAGE ); - return( MBEDTLS_ERR_SSL_UNEXPECTED_MESSAGE ); - } - - if( ssl->in_msg[0] != MBEDTLS_SSL_HS_CERTIFICATE || - ssl->in_hslen < mbedtls_ssl_hs_hdr_len( ssl ) + 3 + 3 ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad certificate message" ) ); - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR ); - return( MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE ); - } - - i = mbedtls_ssl_hs_hdr_len( ssl ); - - /* - * Same message structure as in mbedtls_ssl_write_certificate() - */ - n = ( ssl->in_msg[i+1] << 8 ) | ssl->in_msg[i+2]; - - if( ssl->in_msg[i] != 0 || - ssl->in_hslen != n + 3 + mbedtls_ssl_hs_hdr_len( ssl ) ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad certificate message" ) ); - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR ); - return( MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE ); - } - - /* Make &ssl->in_msg[i] point to the beginning of the CRT chain. */ - i += 3; - - /* Iterate through and parse the CRTs in the provided chain. */ - while( i < ssl->in_hslen ) - { - /* Check that there's room for the next CRT's length fields. */ - if ( i + 3 > ssl->in_hslen ) { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad certificate message" ) ); - mbedtls_ssl_send_alert_message( ssl, - MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR ); - return( MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE ); - } - /* In theory, the CRT can be up to 2**24 Bytes, but we don't support - * anything beyond 2**16 ~ 64K. */ - if( ssl->in_msg[i] != 0 ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad certificate message" ) ); - mbedtls_ssl_send_alert_message( ssl, - MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR ); - return( MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE ); - } - - /* Read length of the next CRT in the chain. */ - n = ( (unsigned int) ssl->in_msg[i + 1] << 8 ) - | (unsigned int) ssl->in_msg[i + 2]; - i += 3; - - if( n < 128 || i + n > ssl->in_hslen ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad certificate message" ) ); - mbedtls_ssl_send_alert_message( ssl, - MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR ); - return( MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE ); - } - - /* Check if we're handling the first CRT in the chain. */ -#if defined(MBEDTLS_SSL_RENEGOTIATION) && defined(MBEDTLS_SSL_CLI_C) - if( crt_cnt++ == 0 && - ssl->conf->endpoint == MBEDTLS_SSL_IS_CLIENT && - ssl->renego_status == MBEDTLS_SSL_RENEGOTIATION_IN_PROGRESS ) - { - /* During client-side renegotiation, check that the server's - * end-CRTs hasn't changed compared to the initial handshake, - * mitigating the triple handshake attack. On success, reuse - * the original end-CRT instead of parsing it again. */ - MBEDTLS_SSL_DEBUG_MSG( 3, ( "Check that peer CRT hasn't changed during renegotiation" ) ); - if( ssl_check_peer_crt_unchanged( ssl, - &ssl->in_msg[i], - n ) != 0 ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "new server cert during renegotiation" ) ); - mbedtls_ssl_send_alert_message( ssl, - MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_ACCESS_DENIED ); - return( MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE ); - } - - /* Now we can safely free the original chain. */ - ssl_clear_peer_cert( ssl->session ); - } -#endif /* MBEDTLS_SSL_RENEGOTIATION && MBEDTLS_SSL_CLI_C */ - - /* Parse the next certificate in the chain. */ -#if defined(MBEDTLS_SSL_KEEP_PEER_CERTIFICATE) - ret = mbedtls_x509_crt_parse_der( chain, ssl->in_msg + i, n ); -#else - /* If we don't need to store the CRT chain permanently, parse - * it in-place from the input buffer instead of making a copy. */ - ret = mbedtls_x509_crt_parse_der_nocopy( chain, ssl->in_msg + i, n ); -#endif /* MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */ - switch( ret ) - { - case 0: /*ok*/ - case MBEDTLS_ERR_X509_UNKNOWN_SIG_ALG + MBEDTLS_ERR_OID_NOT_FOUND: - /* Ignore certificate with an unknown algorithm: maybe a - prior certificate was already trusted. */ - break; - - case MBEDTLS_ERR_X509_ALLOC_FAILED: - alert = MBEDTLS_SSL_ALERT_MSG_INTERNAL_ERROR; - goto crt_parse_der_failed; - - case MBEDTLS_ERR_X509_UNKNOWN_VERSION: - alert = MBEDTLS_SSL_ALERT_MSG_UNSUPPORTED_CERT; - goto crt_parse_der_failed; - - default: - alert = MBEDTLS_SSL_ALERT_MSG_BAD_CERT; - crt_parse_der_failed: - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, alert ); - MBEDTLS_SSL_DEBUG_RET( 1, " mbedtls_x509_crt_parse_der", ret ); - return( ret ); - } - - i += n; - } - - MBEDTLS_SSL_DEBUG_CRT( 3, "peer certificate", chain ); - return( 0 ); -} - -#if defined(MBEDTLS_SSL_SRV_C) -static int ssl_srv_check_client_no_crt_notification( mbedtls_ssl_context *ssl ) -{ - if( ssl->conf->endpoint == MBEDTLS_SSL_IS_CLIENT ) - return( -1 ); - -#if defined(MBEDTLS_SSL_PROTO_SSL3) - /* - * Check if the client sent an empty certificate - */ - if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 ) - { - if( ssl->in_msglen == 2 && - ssl->in_msgtype == MBEDTLS_SSL_MSG_ALERT && - ssl->in_msg[0] == MBEDTLS_SSL_ALERT_LEVEL_WARNING && - ssl->in_msg[1] == MBEDTLS_SSL_ALERT_MSG_NO_CERT ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "SSLv3 client has no certificate" ) ); - return( 0 ); - } - - return( -1 ); - } -#endif /* MBEDTLS_SSL_PROTO_SSL3 */ - -#if defined(MBEDTLS_SSL_PROTO_TLS1) || defined(MBEDTLS_SSL_PROTO_TLS1_1) || \ - defined(MBEDTLS_SSL_PROTO_TLS1_2) - if( ssl->in_hslen == 3 + mbedtls_ssl_hs_hdr_len( ssl ) && - ssl->in_msgtype == MBEDTLS_SSL_MSG_HANDSHAKE && - ssl->in_msg[0] == MBEDTLS_SSL_HS_CERTIFICATE && - memcmp( ssl->in_msg + mbedtls_ssl_hs_hdr_len( ssl ), "\0\0\0", 3 ) == 0 ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "TLSv1 client has no certificate" ) ); - return( 0 ); - } - - return( -1 ); -#endif /* MBEDTLS_SSL_PROTO_TLS1 || MBEDTLS_SSL_PROTO_TLS1_1 || \ - MBEDTLS_SSL_PROTO_TLS1_2 */ -} -#endif /* MBEDTLS_SSL_SRV_C */ - -/* Check if a certificate message is expected. - * Return either - * - SSL_CERTIFICATE_EXPECTED, or - * - SSL_CERTIFICATE_SKIP - * indicating whether a Certificate message is expected or not. - */ -#define SSL_CERTIFICATE_EXPECTED 0 -#define SSL_CERTIFICATE_SKIP 1 -static int ssl_parse_certificate_coordinate( mbedtls_ssl_context *ssl, - int authmode ) -{ - const mbedtls_ssl_ciphersuite_t *ciphersuite_info = - ssl->handshake->ciphersuite_info; - - if( !mbedtls_ssl_ciphersuite_uses_srv_cert( ciphersuite_info ) ) - return( SSL_CERTIFICATE_SKIP ); - -#if defined(MBEDTLS_SSL_SRV_C) - if( ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER ) - { - if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_RSA_PSK ) - return( SSL_CERTIFICATE_SKIP ); - - if( authmode == MBEDTLS_SSL_VERIFY_NONE ) - { - ssl->session_negotiate->verify_result = - MBEDTLS_X509_BADCERT_SKIP_VERIFY; - return( SSL_CERTIFICATE_SKIP ); - } - } -#else - ((void) authmode); -#endif /* MBEDTLS_SSL_SRV_C */ - - return( SSL_CERTIFICATE_EXPECTED ); -} - -static int ssl_parse_certificate_verify( mbedtls_ssl_context *ssl, - int authmode, - mbedtls_x509_crt *chain, - void *rs_ctx ) -{ - int ret = 0; - const mbedtls_ssl_ciphersuite_t *ciphersuite_info = - ssl->handshake->ciphersuite_info; - int have_ca_chain = 0; - - int (*f_vrfy)(void *, mbedtls_x509_crt *, int, uint32_t *); - void *p_vrfy; - - if( authmode == MBEDTLS_SSL_VERIFY_NONE ) - return( 0 ); - - if( ssl->f_vrfy != NULL ) - { - MBEDTLS_SSL_DEBUG_MSG( 3, ( "Use context-specific verification callback" ) ); - f_vrfy = ssl->f_vrfy; - p_vrfy = ssl->p_vrfy; - } - else - { - MBEDTLS_SSL_DEBUG_MSG( 3, ( "Use configuration-specific verification callback" ) ); - f_vrfy = ssl->conf->f_vrfy; - p_vrfy = ssl->conf->p_vrfy; - } - - /* - * Main check: verify certificate - */ -#if defined(MBEDTLS_X509_TRUSTED_CERTIFICATE_CALLBACK) - if( ssl->conf->f_ca_cb != NULL ) - { - ((void) rs_ctx); - have_ca_chain = 1; - - MBEDTLS_SSL_DEBUG_MSG( 3, ( "use CA callback for X.509 CRT verification" ) ); - ret = mbedtls_x509_crt_verify_with_ca_cb( - chain, - ssl->conf->f_ca_cb, - ssl->conf->p_ca_cb, - ssl->conf->cert_profile, - ssl->hostname, - &ssl->session_negotiate->verify_result, - f_vrfy, p_vrfy ); - } - else -#endif /* MBEDTLS_X509_TRUSTED_CERTIFICATE_CALLBACK */ - { - mbedtls_x509_crt *ca_chain; - mbedtls_x509_crl *ca_crl; - -#if defined(MBEDTLS_SSL_SERVER_NAME_INDICATION) - if( ssl->handshake->sni_ca_chain != NULL ) - { - ca_chain = ssl->handshake->sni_ca_chain; - ca_crl = ssl->handshake->sni_ca_crl; - } - else -#endif - { - ca_chain = ssl->conf->ca_chain; - ca_crl = ssl->conf->ca_crl; - } - - if( ca_chain != NULL ) - have_ca_chain = 1; - - ret = mbedtls_x509_crt_verify_restartable( - chain, - ca_chain, ca_crl, - ssl->conf->cert_profile, - ssl->hostname, - &ssl->session_negotiate->verify_result, - f_vrfy, p_vrfy, rs_ctx ); - } - - if( ret != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "x509_verify_cert", ret ); - } - -#if defined(MBEDTLS_SSL__ECP_RESTARTABLE) - if( ret == MBEDTLS_ERR_ECP_IN_PROGRESS ) - return( MBEDTLS_ERR_SSL_CRYPTO_IN_PROGRESS ); -#endif - - /* - * Secondary checks: always done, but change 'ret' only if it was 0 - */ - -#if defined(MBEDTLS_ECP_C) - { - const mbedtls_pk_context *pk = &chain->pk; - - /* If certificate uses an EC key, make sure the curve is OK */ - if( mbedtls_pk_can_do( pk, MBEDTLS_PK_ECKEY ) && - mbedtls_ssl_check_curve( ssl, mbedtls_pk_ec( *pk )->grp.id ) != 0 ) - { - ssl->session_negotiate->verify_result |= MBEDTLS_X509_BADCERT_BAD_KEY; - - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad certificate (EC key curve)" ) ); - if( ret == 0 ) - ret = MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE; - } - } -#endif /* MBEDTLS_ECP_C */ - - if( mbedtls_ssl_check_cert_usage( chain, - ciphersuite_info, - ! ssl->conf->endpoint, - &ssl->session_negotiate->verify_result ) != 0 ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad certificate (usage extensions)" ) ); - if( ret == 0 ) - ret = MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE; - } - - /* mbedtls_x509_crt_verify_with_profile is supposed to report a - * verification failure through MBEDTLS_ERR_X509_CERT_VERIFY_FAILED, - * with details encoded in the verification flags. All other kinds - * of error codes, including those from the user provided f_vrfy - * functions, are treated as fatal and lead to a failure of - * ssl_parse_certificate even if verification was optional. */ - if( authmode == MBEDTLS_SSL_VERIFY_OPTIONAL && - ( ret == MBEDTLS_ERR_X509_CERT_VERIFY_FAILED || - ret == MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE ) ) - { - ret = 0; - } - - if( have_ca_chain == 0 && authmode == MBEDTLS_SSL_VERIFY_REQUIRED ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "got no CA chain" ) ); - ret = MBEDTLS_ERR_SSL_CA_CHAIN_REQUIRED; - } - - if( ret != 0 ) - { - uint8_t alert; - - /* The certificate may have been rejected for several reasons. - Pick one and send the corresponding alert. Which alert to send - may be a subject of debate in some cases. */ - if( ssl->session_negotiate->verify_result & MBEDTLS_X509_BADCERT_OTHER ) - alert = MBEDTLS_SSL_ALERT_MSG_ACCESS_DENIED; - else if( ssl->session_negotiate->verify_result & MBEDTLS_X509_BADCERT_CN_MISMATCH ) - alert = MBEDTLS_SSL_ALERT_MSG_BAD_CERT; - else if( ssl->session_negotiate->verify_result & MBEDTLS_X509_BADCERT_KEY_USAGE ) - alert = MBEDTLS_SSL_ALERT_MSG_UNSUPPORTED_CERT; - else if( ssl->session_negotiate->verify_result & MBEDTLS_X509_BADCERT_EXT_KEY_USAGE ) - alert = MBEDTLS_SSL_ALERT_MSG_UNSUPPORTED_CERT; - else if( ssl->session_negotiate->verify_result & MBEDTLS_X509_BADCERT_NS_CERT_TYPE ) - alert = MBEDTLS_SSL_ALERT_MSG_UNSUPPORTED_CERT; - else if( ssl->session_negotiate->verify_result & MBEDTLS_X509_BADCERT_BAD_PK ) - alert = MBEDTLS_SSL_ALERT_MSG_UNSUPPORTED_CERT; - else if( ssl->session_negotiate->verify_result & MBEDTLS_X509_BADCERT_BAD_KEY ) - alert = MBEDTLS_SSL_ALERT_MSG_UNSUPPORTED_CERT; - else if( ssl->session_negotiate->verify_result & MBEDTLS_X509_BADCERT_EXPIRED ) - alert = MBEDTLS_SSL_ALERT_MSG_CERT_EXPIRED; - else if( ssl->session_negotiate->verify_result & MBEDTLS_X509_BADCERT_REVOKED ) - alert = MBEDTLS_SSL_ALERT_MSG_CERT_REVOKED; - else if( ssl->session_negotiate->verify_result & MBEDTLS_X509_BADCERT_NOT_TRUSTED ) - alert = MBEDTLS_SSL_ALERT_MSG_UNKNOWN_CA; - else - alert = MBEDTLS_SSL_ALERT_MSG_CERT_UNKNOWN; - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - alert ); - } - -#if defined(MBEDTLS_DEBUG_C) - if( ssl->session_negotiate->verify_result != 0 ) - { - MBEDTLS_SSL_DEBUG_MSG( 3, ( "! Certificate verification flags %x", - ssl->session_negotiate->verify_result ) ); - } - else - { - MBEDTLS_SSL_DEBUG_MSG( 3, ( "Certificate verification flags clear" ) ); - } -#endif /* MBEDTLS_DEBUG_C */ - - return( ret ); -} - -#if !defined(MBEDTLS_SSL_KEEP_PEER_CERTIFICATE) -static int ssl_remember_peer_crt_digest( mbedtls_ssl_context *ssl, - unsigned char *start, size_t len ) -{ - int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; - /* Remember digest of the peer's end-CRT. */ - ssl->session_negotiate->peer_cert_digest = - mbedtls_calloc( 1, MBEDTLS_SSL_PEER_CERT_DIGEST_DFL_LEN ); - if( ssl->session_negotiate->peer_cert_digest == NULL ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "alloc(%d bytes) failed", - MBEDTLS_SSL_PEER_CERT_DIGEST_DFL_LEN ) ); - mbedtls_ssl_send_alert_message( ssl, - MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_INTERNAL_ERROR ); - - return( MBEDTLS_ERR_SSL_ALLOC_FAILED ); - } - - ret = mbedtls_md( mbedtls_md_info_from_type( - MBEDTLS_SSL_PEER_CERT_DIGEST_DFL_TYPE ), - start, len, - ssl->session_negotiate->peer_cert_digest ); - - ssl->session_negotiate->peer_cert_digest_type = - MBEDTLS_SSL_PEER_CERT_DIGEST_DFL_TYPE; - ssl->session_negotiate->peer_cert_digest_len = - MBEDTLS_SSL_PEER_CERT_DIGEST_DFL_LEN; - - return( ret ); -} - -static int ssl_remember_peer_pubkey( mbedtls_ssl_context *ssl, - unsigned char *start, size_t len ) -{ - unsigned char *end = start + len; - int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; - - /* Make a copy of the peer's raw public key. */ - mbedtls_pk_init( &ssl->handshake->peer_pubkey ); - ret = mbedtls_pk_parse_subpubkey( &start, end, - &ssl->handshake->peer_pubkey ); - if( ret != 0 ) - { - /* We should have parsed the public key before. */ - return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); - } - - return( 0 ); -} -#endif /* !MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */ - -int mbedtls_ssl_parse_certificate( mbedtls_ssl_context *ssl ) -{ - int ret = 0; - int crt_expected; -#if defined(MBEDTLS_SSL_SRV_C) && defined(MBEDTLS_SSL_SERVER_NAME_INDICATION) - const int authmode = ssl->handshake->sni_authmode != MBEDTLS_SSL_VERIFY_UNSET - ? ssl->handshake->sni_authmode - : ssl->conf->authmode; -#else - const int authmode = ssl->conf->authmode; -#endif - void *rs_ctx = NULL; - mbedtls_x509_crt *chain = NULL; - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> parse certificate" ) ); - - crt_expected = ssl_parse_certificate_coordinate( ssl, authmode ); - if( crt_expected == SSL_CERTIFICATE_SKIP ) - { - MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= skip parse certificate" ) ); - goto exit; - } - -#if defined(MBEDTLS_SSL__ECP_RESTARTABLE) - if( ssl->handshake->ecrs_enabled && - ssl->handshake->ecrs_state == ssl_ecrs_crt_verify ) - { - chain = ssl->handshake->ecrs_peer_cert; - ssl->handshake->ecrs_peer_cert = NULL; - goto crt_verify; - } -#endif - - if( ( ret = mbedtls_ssl_read_record( ssl, 1 ) ) != 0 ) - { - /* mbedtls_ssl_read_record may have sent an alert already. We - let it decide whether to alert. */ - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_read_record", ret ); - goto exit; - } - -#if defined(MBEDTLS_SSL_SRV_C) - if( ssl_srv_check_client_no_crt_notification( ssl ) == 0 ) - { - ssl->session_negotiate->verify_result = MBEDTLS_X509_BADCERT_MISSING; - - if( authmode == MBEDTLS_SSL_VERIFY_OPTIONAL ) - ret = 0; - else - ret = MBEDTLS_ERR_SSL_NO_CLIENT_CERTIFICATE; - - goto exit; - } -#endif /* MBEDTLS_SSL_SRV_C */ - - /* Clear existing peer CRT structure in case we tried to - * reuse a session but it failed, and allocate a new one. */ - ssl_clear_peer_cert( ssl->session_negotiate ); - - chain = mbedtls_calloc( 1, sizeof( mbedtls_x509_crt ) ); - if( chain == NULL ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "alloc(%d bytes) failed", - sizeof( mbedtls_x509_crt ) ) ); - mbedtls_ssl_send_alert_message( ssl, - MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_INTERNAL_ERROR ); - - ret = MBEDTLS_ERR_SSL_ALLOC_FAILED; - goto exit; - } - mbedtls_x509_crt_init( chain ); - - ret = ssl_parse_certificate_chain( ssl, chain ); - if( ret != 0 ) - goto exit; - -#if defined(MBEDTLS_SSL__ECP_RESTARTABLE) - if( ssl->handshake->ecrs_enabled) - ssl->handshake->ecrs_state = ssl_ecrs_crt_verify; - -crt_verify: - if( ssl->handshake->ecrs_enabled) - rs_ctx = &ssl->handshake->ecrs_ctx; -#endif - - ret = ssl_parse_certificate_verify( ssl, authmode, - chain, rs_ctx ); - if( ret != 0 ) - goto exit; - -#if !defined(MBEDTLS_SSL_KEEP_PEER_CERTIFICATE) - { - unsigned char *crt_start, *pk_start; - size_t crt_len, pk_len; - - /* We parse the CRT chain without copying, so - * these pointers point into the input buffer, - * and are hence still valid after freeing the - * CRT chain. */ - - crt_start = chain->raw.p; - crt_len = chain->raw.len; - - pk_start = chain->pk_raw.p; - pk_len = chain->pk_raw.len; - - /* Free the CRT structures before computing - * digest and copying the peer's public key. */ - mbedtls_x509_crt_free( chain ); - mbedtls_free( chain ); - chain = NULL; - - ret = ssl_remember_peer_crt_digest( ssl, crt_start, crt_len ); - if( ret != 0 ) - goto exit; - - ret = ssl_remember_peer_pubkey( ssl, pk_start, pk_len ); - if( ret != 0 ) - goto exit; - } -#else /* !MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */ - /* Pass ownership to session structure. */ - ssl->session_negotiate->peer_cert = chain; - chain = NULL; -#endif /* MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */ - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= parse certificate" ) ); - -exit: - - if( ret == 0 ) - ssl->state++; - -#if defined(MBEDTLS_SSL__ECP_RESTARTABLE) - if( ret == MBEDTLS_ERR_SSL_CRYPTO_IN_PROGRESS ) - { - ssl->handshake->ecrs_peer_cert = chain; - chain = NULL; - } -#endif - - if( chain != NULL ) - { - mbedtls_x509_crt_free( chain ); - mbedtls_free( chain ); - } - - return( ret ); -} -#endif /* MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED */ void mbedtls_ssl_optimize_checksum( mbedtls_ssl_context *ssl, const mbedtls_ssl_ciphersuite_t *ciphersuite_info ) @@ -3372,209 +2503,6 @@ void mbedtls_ssl_handshake_wrapup( mbedtls_ssl_context *ssl ) MBEDTLS_SSL_DEBUG_MSG( 3, ( "<= handshake wrapup" ) ); } -int mbedtls_ssl_write_finished( mbedtls_ssl_context *ssl ) -{ - int ret, hash_len; - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> write finished" ) ); - - mbedtls_ssl_update_out_pointers( ssl, ssl->transform_negotiate ); - - ssl->handshake->calc_finished( ssl, ssl->out_msg + 4, ssl->conf->endpoint ); - - /* - * RFC 5246 7.4.9 (Page 63) says 12 is the default length and ciphersuites - * may define some other value. Currently (early 2016), no defined - * ciphersuite does this (and this is unlikely to change as activity has - * moved to TLS 1.3 now) so we can keep the hardcoded 12 here. - */ - hash_len = ( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 ) ? 36 : 12; - -#if defined(MBEDTLS_SSL_RENEGOTIATION) - ssl->verify_data_len = hash_len; - memcpy( ssl->own_verify_data, ssl->out_msg + 4, hash_len ); -#endif - - ssl->out_msglen = 4 + hash_len; - ssl->out_msgtype = MBEDTLS_SSL_MSG_HANDSHAKE; - ssl->out_msg[0] = MBEDTLS_SSL_HS_FINISHED; - - /* - * In case of session resuming, invert the client and server - * ChangeCipherSpec messages order. - */ - if( ssl->handshake->resume != 0 ) - { -#if defined(MBEDTLS_SSL_CLI_C) - if( ssl->conf->endpoint == MBEDTLS_SSL_IS_CLIENT ) - ssl->state = MBEDTLS_SSL_HANDSHAKE_WRAPUP; -#endif -#if defined(MBEDTLS_SSL_SRV_C) - if( ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER ) - ssl->state = MBEDTLS_SSL_CLIENT_CHANGE_CIPHER_SPEC; -#endif - } - else - ssl->state++; - - /* - * Switch to our negotiated transform and session parameters for outbound - * data. - */ - MBEDTLS_SSL_DEBUG_MSG( 3, ( "switching to new transform spec for outbound data" ) ); - -#if defined(MBEDTLS_SSL_PROTO_DTLS) - if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM ) - { - unsigned char i; - - /* Remember current epoch settings for resending */ - ssl->handshake->alt_transform_out = ssl->transform_out; - memcpy( ssl->handshake->alt_out_ctr, ssl->cur_out_ctr, 8 ); - - /* Set sequence_number to zero */ - memset( ssl->cur_out_ctr + 2, 0, 6 ); - - /* Increment epoch */ - for( i = 2; i > 0; i-- ) - if( ++ssl->cur_out_ctr[i - 1] != 0 ) - break; - - /* The loop goes to its end iff the counter is wrapping */ - if( i == 0 ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "DTLS epoch would wrap" ) ); - return( MBEDTLS_ERR_SSL_COUNTER_WRAPPING ); - } - } - else -#endif /* MBEDTLS_SSL_PROTO_DTLS */ - memset( ssl->cur_out_ctr, 0, 8 ); - - ssl->transform_out = ssl->transform_negotiate; - ssl->session_out = ssl->session_negotiate; - -#if defined(MBEDTLS_SSL_HW_RECORD_ACCEL) - if( mbedtls_ssl_hw_record_activate != NULL ) - { - if( ( ret = mbedtls_ssl_hw_record_activate( ssl, MBEDTLS_SSL_CHANNEL_OUTBOUND ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_hw_record_activate", ret ); - return( MBEDTLS_ERR_SSL_HW_ACCEL_FAILED ); - } - } -#endif - -#if defined(MBEDTLS_SSL_PROTO_DTLS) - if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM ) - mbedtls_ssl_send_flight_completed( ssl ); -#endif - - if( ( ret = mbedtls_ssl_write_handshake_msg( ssl ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_write_handshake_msg", ret ); - return( ret ); - } - -#if defined(MBEDTLS_SSL_PROTO_DTLS) - if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM && - ( ret = mbedtls_ssl_flight_transmit( ssl ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_flight_transmit", ret ); - return( ret ); - } -#endif - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= write finished" ) ); - - return( 0 ); -} - -#if defined(MBEDTLS_SSL_PROTO_SSL3) -#define SSL_MAX_HASH_LEN 36 -#else -#define SSL_MAX_HASH_LEN 12 -#endif - -int mbedtls_ssl_parse_finished( mbedtls_ssl_context *ssl ) -{ - int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; - unsigned int hash_len; - unsigned char buf[SSL_MAX_HASH_LEN]; - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> parse finished" ) ); - - ssl->handshake->calc_finished( ssl, buf, ssl->conf->endpoint ^ 1 ); - - if( ( ret = mbedtls_ssl_read_record( ssl, 1 ) ) != 0 ) - { - MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_read_record", ret ); - return( ret ); - } - - if( ssl->in_msgtype != MBEDTLS_SSL_MSG_HANDSHAKE ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad finished message" ) ); - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_UNEXPECTED_MESSAGE ); - return( MBEDTLS_ERR_SSL_UNEXPECTED_MESSAGE ); - } - - /* There is currently no ciphersuite using another length with TLS 1.2 */ -#if defined(MBEDTLS_SSL_PROTO_SSL3) - if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 ) - hash_len = 36; - else -#endif - hash_len = 12; - - if( ssl->in_msg[0] != MBEDTLS_SSL_HS_FINISHED || - ssl->in_hslen != mbedtls_ssl_hs_hdr_len( ssl ) + hash_len ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad finished message" ) ); - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR ); - return( MBEDTLS_ERR_SSL_BAD_HS_FINISHED ); - } - - if( mbedtls_ssl_safer_memcmp( ssl->in_msg + mbedtls_ssl_hs_hdr_len( ssl ), - buf, hash_len ) != 0 ) - { - MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad finished message" ) ); - mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, - MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR ); - return( MBEDTLS_ERR_SSL_BAD_HS_FINISHED ); - } - -#if defined(MBEDTLS_SSL_RENEGOTIATION) - ssl->verify_data_len = hash_len; - memcpy( ssl->peer_verify_data, buf, hash_len ); -#endif - - if( ssl->handshake->resume != 0 ) - { -#if defined(MBEDTLS_SSL_CLI_C) - if( ssl->conf->endpoint == MBEDTLS_SSL_IS_CLIENT ) - ssl->state = MBEDTLS_SSL_CLIENT_CHANGE_CIPHER_SPEC; -#endif -#if defined(MBEDTLS_SSL_SRV_C) - if( ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER ) - ssl->state = MBEDTLS_SSL_HANDSHAKE_WRAPUP; -#endif - } - else - ssl->state++; - -#if defined(MBEDTLS_SSL_PROTO_DTLS) - if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM ) - mbedtls_ssl_recv_flight_completed( ssl ); -#endif - - MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= parse finished" ) ); - - return( 0 ); -} - static void ssl_handshake_params_init( mbedtls_ssl_handshake_params *handshake ) { memset( handshake, 0, sizeof( mbedtls_ssl_handshake_params ) ); @@ -5696,9 +4624,10 @@ int mbedtls_ssl_renegotiate( mbedtls_ssl_context *ssl ) if( ssl->state != MBEDTLS_SSL_HANDSHAKE_OVER ) return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); - if( ( ret = ssl_start_renegotiation( ssl ) ) != 0 ) + if( ( ret = mbedtls_ssl_start_renegotiation( ssl ) ) != 0 ) { - MBEDTLS_SSL_DEBUG_RET( 1, "ssl_start_renegotiation", ret ); + MBEDTLS_SSL_DEBUG_RET( 1, + "mbedtls_ssl_start_renegotiation", ret ); return( ret ); } } @@ -5871,7 +4800,7 @@ void mbedtls_ssl_session_free( mbedtls_ssl_session *session ) return; #if defined(MBEDTLS_X509_CRT_PARSE_C) - ssl_clear_peer_cert( session ); + mbedtls_ssl_clear_peer_cert( session ); #endif #if defined(MBEDTLS_SSL_SESSION_TICKETS) && defined(MBEDTLS_SSL_CLI_C)