mirror of
https://github.com/yuzu-emu/mbedtls.git
synced 2024-11-26 06:35:42 +01:00
Change key derivation for srtp
Use the export keys functionality, to call the public API `mbedtls_ssl_tls_prf()`, and remove the function `mbedtls_ssl_get_dtls_srtp_key_material()`. Signed-off-by: Johan Pascal <johan.pascal@belledonne-communications.com>
This commit is contained in:
Ron Eldor
Johan Pascal
parent
5d991c9549
commit
65b56ef87f
@ -893,12 +893,6 @@ typedef struct mbedtls_dtls_srtp_info_t
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{
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/*! The SRTP profile that was negotiated*/
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mbedtls_ssl_srtp_profile chosen_dtls_srtp_profile;
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/*! master keys and master salt for SRTP generated during handshake */
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unsigned char dtls_srtp_keys[MBEDTLS_DTLS_SRTP_MAX_KEY_MATERIAL_LENGTH];
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/*! length in bytes of master keys and master salt for
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* SRTP generated during handshake
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*/
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size_t dtls_srtp_keys_len;
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/*! The mki_value used, with max size of 256 bytes */
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unsigned char mki_value[MBEDTLS_DTLS_SRTP_MAX_MKI_LENGTH];
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/*! The length of mki_value */
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@ -3249,25 +3243,6 @@ int mbedtls_ssl_dtls_srtp_set_mki_value( mbedtls_ssl_context *ssl,
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mbedtls_ssl_srtp_profile mbedtls_ssl_get_dtls_srtp_protection_profile
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( const mbedtls_ssl_context *ssl );
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/**
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* \brief Get the generated DTLS-SRTP key material.
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* This function should be called after the handshake is
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* completed. It shall returns 60 bytes of key material
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* generated according to RFC 5764
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*
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* \param ssl SSL context tobe used.
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* \param key Buffer to hold the generated key material.
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* \param key_buffer_len Key buffer size.
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* \param olen the actual number of bytes written to key.
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*
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* \return 0 on success, #MBEDTLS_ERR_SSL_BUFFER_TOO_SMALL if
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* the key buffer is too small to hold the generated key.
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*/
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int mbedtls_ssl_get_dtls_srtp_key_material( const mbedtls_ssl_context *ssl,
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unsigned char *key,
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size_t key_buffer_len,
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size_t *olen );
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/**
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* \brief Utility function to get information on DTLS-SRTP profile.
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*
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@ -871,31 +871,6 @@ static int ssl_populate_transform( mbedtls_ssl_transform *transform,
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(void) ssl;
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#endif
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#if defined(MBEDTLS_SSL_DTLS_SRTP)
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/* check if we have a chosen srtp protection profile */
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if ( ssl->dtls_srtp_info.chosen_dtls_srtp_profile != MBEDTLS_SRTP_UNSET_PROFILE )
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{
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/* derive key material for srtp session RFC5764 section 4.2
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* master key and master salt are respectively 128 bits and 112 bits
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* for all currently available modes:
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* SRTP_AES128_CM_HMAC_SHA1_80, SRTP_AES128_CM_HMAC_SHA1_32
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* SRTP_NULL_HMAC_SHA1_80, SRTP_NULL_HMAC_SHA1_32
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* So we must export 2*(128 + 112) = 480 bits
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*/
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ssl->dtls_srtp_info.dtls_srtp_keys_len = MBEDTLS_DTLS_SRTP_MAX_KEY_MATERIAL_LENGTH;
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ret = tls_prf( master, 48, "EXTRACTOR-dtls_srtp",
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randbytes, 64, ssl->dtls_srtp_info.dtls_srtp_keys,
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ssl->dtls_srtp_info.dtls_srtp_keys_len );
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if( ret != 0 )
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{
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MBEDTLS_SSL_DEBUG_RET( 1, "dtls srtp prf", ret );
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return( ret );
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}
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}
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#endif /* MBEDTLS_SSL_DTLS_SRTP */
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/*
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* Some data just needs copying into the structure
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*/
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@ -4837,25 +4812,6 @@ mbedtls_ssl_srtp_profile
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{
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return( ssl->dtls_srtp_info.chosen_dtls_srtp_profile );
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}
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int mbedtls_ssl_get_dtls_srtp_key_material( const mbedtls_ssl_context *ssl,
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unsigned char *key,
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size_t key_buffer_len,
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size_t *olen )
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{
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/* check output buffer size */
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if( key_buffer_len < ssl->dtls_srtp_info.dtls_srtp_keys_len )
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{
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return( MBEDTLS_ERR_SSL_BUFFER_TOO_SMALL );
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}
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memcpy( key, ssl->dtls_srtp_info.dtls_srtp_keys,
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ssl->dtls_srtp_info.dtls_srtp_keys_len );
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*olen = ssl->dtls_srtp_info.dtls_srtp_keys_len;
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return( 0 );
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}
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#endif /* MBEDTLS_SSL_DTLS_SRTP */
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void mbedtls_ssl_conf_max_version( mbedtls_ssl_config *conf, int major, int minor )
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@ -6955,11 +6911,6 @@ void mbedtls_ssl_free( mbedtls_ssl_context *ssl )
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mbedtls_free( ssl->cli_id );
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#endif
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#if defined (MBEDTLS_SSL_DTLS_SRTP)
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mbedtls_platform_zeroize( ssl->dtls_srtp_info.dtls_srtp_keys,
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ssl->dtls_srtp_info.dtls_srtp_keys_len );
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#endif /* MBEDTLS_SSL_DTLS_SRTP */
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MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= free" ) );
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/* Actually clear after last debug message */
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@ -257,10 +257,26 @@ int main( void )
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" This cannot be used with eap_tls=1\n"
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#define USAGE_NSS_KEYLOG_FILE \
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" nss_keylog_file=%%s\n"
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#else
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#if defined(MBEDTLS_SSL_DTLS_SRTP)
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#define USAGE_SRTP \
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" use_srtp=%%d default: 0 (disabled)\n" \
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" This cannot be used with eap_tls=1 or "\
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" nss_keylog=1\n" \
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" srtp_force_profile=%%d default: all enabled\n" \
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" available profiles:\n" \
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" 1 - SRTP_AES128_CM_HMAC_SHA1_80\n" \
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" 2 - SRTP_AES128_CM_HMAC_SHA1_32\n" \
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" 3 - SRTP_NULL_HMAC_SHA1_80\n" \
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" 4 - SRTP_NULL_HMAC_SHA1_32\n" \
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" mki=%%s default: \"\" (in hex, without 0x)\n"
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#else /* MBEDTLS_SSL_DTLS_SRTP */
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#define USAGE_SRTP ""
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#endif
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#else /* MBEDTLS_SSL_EXPORT_KEYS */
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#define USAGE_EAP_TLS ""
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#define USAGE_NSS_KEYLOG ""
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#define USAGE_NSS_KEYLOG_FILE ""
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#define USAGE_SRTP ""
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#endif /* MBEDTLS_SSL_EXPORT_KEYS */
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#if defined(MBEDTLS_SSL_TRUNCATED_HMAC)
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@ -324,20 +340,6 @@ int main( void )
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#define USAGE_DTLS ""
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#endif
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#if defined(MBEDTLS_SSL_DTLS_SRTP)
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#define USAGE_SRTP \
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" use_srtp=%%d default: 0 (disabled)\n" \
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" srtp_force_profile=%%d default: all enabled\n" \
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" available profiles:\n" \
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" 1 - SRTP_AES128_CM_HMAC_SHA1_80\n" \
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" 2 - SRTP_AES128_CM_HMAC_SHA1_32\n" \
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" 3 - SRTP_NULL_HMAC_SHA1_80\n" \
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" 4 - SRTP_NULL_HMAC_SHA1_32\n" \
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" mki=%%s default: \"\" (in hex, without 0x)\n"
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#else
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#define USAGE_SRTP ""
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#endif
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#if defined(MBEDTLS_SSL_FALLBACK_SCSV)
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#define USAGE_FALLBACK \
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" fallback=0/1 default: (library default: off)\n"
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@ -676,7 +678,43 @@ exit:
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sizeof( nss_keylog_line ) );
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return( ret );
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}
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#endif
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#if defined( MBEDTLS_SSL_DTLS_SRTP )
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typedef struct dtls_srtp_keys
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{
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unsigned char master_secret[48];
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unsigned char randbytes[64];
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mbedtls_tls_prf_types tls_prf_type;
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} dtls_srtp_keys;
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static int dtls_srtp_key_derivation( void *p_expkey,
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const unsigned char *ms,
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const unsigned char *kb,
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size_t maclen,
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size_t keylen,
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size_t ivlen,
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const unsigned char client_random[32],
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const unsigned char server_random[32],
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mbedtls_tls_prf_types tls_prf_type )
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{
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dtls_srtp_keys *keys = (dtls_srtp_keys *)p_expkey;
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( ( void ) kb );
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memcpy( keys->master_secret, ms, sizeof( keys->master_secret ) );
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memcpy( keys->randbytes, client_random, 32 );
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memcpy( keys->randbytes + 32, server_random, 32 );
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keys->tls_prf_type = tls_prf_type;
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if( opt.debug_level > 2 )
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{
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mbedtls_printf("exported maclen is %u\n", (unsigned)maclen);
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mbedtls_printf("exported keylen is %u\n", (unsigned)keylen);
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mbedtls_printf("exported ivlen is %u\n", (unsigned)ivlen);
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}
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return( 0 );
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}
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#endif /* MBEDTLS_SSL_DTLS_SRTP */
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#endif /* MBEDTLS_SSL_EXPORT_KEYS */
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static void my_debug( void *ctx, int level,
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const char *file, int line,
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@ -1157,7 +1195,6 @@ int main( int argc, char *argv[] )
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#endif
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#if defined(MBEDTLS_SSL_DTLS_SRTP)
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unsigned char mki[MBEDTLS_DTLS_SRTP_MAX_MKI_LENGTH];
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size_t mki_len = 0;
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#endif
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const char *pers = "ssl_client2";
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@ -1202,7 +1239,13 @@ int main( int argc, char *argv[] )
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unsigned char eap_tls_iv[8];
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const char* eap_tls_label = "client EAP encryption";
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eap_tls_keys eap_tls_keying;
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#endif
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#if defined( MBEDTLS_SSL_DTLS_SRTP )
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/*! master keys and master salt for SRTP generated during handshake */
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unsigned char dtls_srtp_key_material[MBEDTLS_DTLS_SRTP_MAX_KEY_MATERIAL_LENGTH];
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const char* dtls_srtp_label = "EXTRACTOR-dtls_srtp";
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dtls_srtp_keys dtls_srtp_keying;
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#endif /* MBEDTLS_SSL_DTLS_SRTP */
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#endif /* MBEDTLS_SSL_EXPORT_KEYS */
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#if defined(MBEDTLS_MEMORY_BUFFER_ALLOC_C)
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mbedtls_memory_buffer_alloc_init( alloc_buf, sizeof(alloc_buf) );
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@ -2344,7 +2387,14 @@ int main( int argc, char *argv[] )
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nss_keylog_export,
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NULL );
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}
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#endif
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#if defined( MBEDTLS_SSL_DTLS_SRTP )
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else if( opt.use_srtp != 0 )
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{
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mbedtls_ssl_conf_export_keys_ext_cb( &conf, dtls_srtp_key_derivation,
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&dtls_srtp_keying );
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}
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#endif /* MBEDTLS_SSL_DTLS_SRTP */
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#endif /* MBEDTLS_SSL_EXPORT_KEYS */
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#if defined(MBEDTLS_SSL_CBC_RECORD_SPLITTING)
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if( opt.recsplit != DFL_RECSPLIT )
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@ -2553,7 +2603,7 @@ int main( int argc, char *argv[] )
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mbedtls_ecp_set_max_ops( opt.ec_max_ops );
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#endif
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#if defined(MBEDTLS_SSL_DTLS_SRTP)
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#if defined(MBEDTLS_SSL_DTLS_SRTP)
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if( opt.use_srtp != DFL_USE_SRTP && strlen( opt.mki ) != 0 )
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{
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if( mbedtls_test_unhexify( mki, sizeof( mki ),
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@ -2565,7 +2615,7 @@ int main( int argc, char *argv[] )
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mbedtls_ssl_conf_srtp_mki_value_supported( &conf, MBEDTLS_SSL_DTLS_SRTP_MKI_SUPPORTED );
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if( ( ret = mbedtls_ssl_dtls_srtp_set_mki_value( &ssl, mki,
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strlen( mki ) ) ) != 0 )
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strlen( opt.mki ) / 2 ) ) != 0 )
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{
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mbedtls_printf( " failed\n ! mbedtls_ssl_dtls_srtp_set_mki_value returned %d\n\n", ret );
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goto exit;
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@ -2694,7 +2744,39 @@ int main( int argc, char *argv[] )
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}
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mbedtls_printf("\n");
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}
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#endif
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#if defined( MBEDTLS_SSL_DTLS_SRTP )
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else if( opt.use_srtp != 0 )
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{
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size_t j = 0;
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if( ( ret = mbedtls_ssl_tls_prf( dtls_srtp_keying.tls_prf_type,
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dtls_srtp_keying.master_secret,
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sizeof( dtls_srtp_keying.master_secret ),
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dtls_srtp_label,
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dtls_srtp_keying.randbytes,
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sizeof( dtls_srtp_keying.randbytes ),
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dtls_srtp_key_material,
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sizeof( dtls_srtp_key_material ) ) )
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!= 0 )
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{
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mbedtls_printf( " failed\n ! mbedtls_ssl_tls_prf returned -0x%x\n\n",
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-ret );
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goto exit;
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}
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mbedtls_printf( " DTLS-SRTP key material is:" );
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for( j = 0; j < sizeof( dtls_srtp_key_material ); j++ )
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{
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if( j % 8 == 0 )
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mbedtls_printf("\n ");
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mbedtls_printf("%02x ", dtls_srtp_key_material[j] );
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}
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mbedtls_printf("\n");
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}
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#endif /* MBEDTLS_SSL_DTLS_SRTP */
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#endif /* MBEDTLS_SSL_EXPORT_KEYS */
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if( opt.reconnect != 0 )
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{
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mbedtls_printf(" . Saving session for reuse..." );
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@ -328,10 +328,24 @@ int main( void )
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" This cannot be used with eap_tls=1\n"
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#define USAGE_NSS_KEYLOG_FILE \
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" nss_keylog_file=%%s\n"
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#else
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#if defined(MBEDTLS_SSL_DTLS_SRTP)
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#define USAGE_SRTP \
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" use_srtp=%%d default: 0 (disabled)\n" \
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" srtp_force_profile=%%d default: all enabled\n" \
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" available profiles:\n" \
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" 1 - SRTP_AES128_CM_HMAC_SHA1_80\n" \
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" 2 - SRTP_AES128_CM_HMAC_SHA1_32\n" \
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" 3 - SRTP_NULL_HMAC_SHA1_80\n" \
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" 4 - SRTP_NULL_HMAC_SHA1_32\n" \
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" support_mki=%%d default: 0 (not supported)\n"
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#else /* MBEDTLS_SSL_DTLS_SRTP */
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#define USAGE_SRTP ""
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#endif
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#else /* MBEDTLS_SSL_EXPORT_KEYS */
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#define USAGE_EAP_TLS ""
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#define USAGE_NSS_KEYLOG ""
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#define USAGE_NSS_KEYLOG_FILE ""
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#define USAGE_SRTP ""
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#endif /* MBEDTLS_SSL_EXPORT_KEYS */
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#if defined(MBEDTLS_SSL_CACHE_C)
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@ -414,20 +428,6 @@ int main( void )
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#define USAGE_DTLS ""
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#endif
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#if defined(MBEDTLS_SSL_DTLS_SRTP)
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#define USAGE_SRTP \
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" use_srtp=%%d default: 0 (disabled)\n" \
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" srtp_force_profile=%%d default: all enabled\n" \
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" available profiles:\n" \
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" 1 - SRTP_AES128_CM_HMAC_SHA1_80\n" \
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" 2 - SRTP_AES128_CM_HMAC_SHA1_32\n" \
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" 3 - SRTP_NULL_HMAC_SHA1_80\n" \
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" 4 - SRTP_NULL_HMAC_SHA1_32\n" \
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" support_mki=%%d default: 0 (not supported)\n"
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#else
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#define USAGE_SRTP ""
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#endif
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#if defined(MBEDTLS_SSL_EXTENDED_MASTER_SECRET)
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#define USAGE_EMS \
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" extended_ms=0/1 default: (library default: on)\n"
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@ -781,7 +781,43 @@ exit:
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return( ret );
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}
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#endif
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#if defined( MBEDTLS_SSL_DTLS_SRTP )
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typedef struct dtls_srtp_keys
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{
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unsigned char master_secret[48];
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unsigned char randbytes[64];
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mbedtls_tls_prf_types tls_prf_type;
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} dtls_srtp_keys;
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static int dtls_srtp_key_derivation( void *p_expkey,
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const unsigned char *ms,
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const unsigned char *kb,
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size_t maclen,
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size_t keylen,
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size_t ivlen,
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const unsigned char client_random[32],
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const unsigned char server_random[32],
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mbedtls_tls_prf_types tls_prf_type )
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{
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dtls_srtp_keys *keys = (dtls_srtp_keys *)p_expkey;
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( ( void ) kb );
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memcpy( keys->master_secret, ms, sizeof( keys->master_secret ) );
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memcpy( keys->randbytes, client_random, 32 );
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memcpy( keys->randbytes + 32, server_random, 32 );
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keys->tls_prf_type = tls_prf_type;
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if( opt.debug_level > 2 )
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{
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mbedtls_printf("exported maclen is %u\n", (unsigned)maclen);
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mbedtls_printf("exported keylen is %u\n", (unsigned)keylen);
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mbedtls_printf("exported ivlen is %u\n", (unsigned)ivlen);
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}
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return( 0 );
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}
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#endif /* MBEDTLS_SSL_DTLS_SRTP */
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#endif /* MBEDTLS_SSL_EXPORT_KEYS */
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|
||||
static void my_debug( void *ctx, int level,
|
||||
const char *file, int line,
|
||||
@ -1824,10 +1860,6 @@ int main( int argc, char *argv[] )
|
||||
size_t context_buf_len = 0;
|
||||
#endif
|
||||
|
||||
#if defined(MBEDTLS_SSL_DTLS_SRTP)
|
||||
unsigned char mki[MBEDTLS_DTLS_SRTP_MAX_MKI_LENGTH];
|
||||
size_t mki_len = 0;
|
||||
#endif
|
||||
int i;
|
||||
char *p, *q;
|
||||
const int *list;
|
||||
@ -1839,7 +1871,13 @@ int main( int argc, char *argv[] )
|
||||
unsigned char eap_tls_iv[8];
|
||||
const char* eap_tls_label = "client EAP encryption";
|
||||
eap_tls_keys eap_tls_keying;
|
||||
#endif
|
||||
#if defined( MBEDTLS_SSL_DTLS_SRTP )
|
||||
/*! master keys and master salt for SRTP generated during handshake */
|
||||
unsigned char dtls_srtp_key_material[MBEDTLS_DTLS_SRTP_MAX_KEY_MATERIAL_LENGTH];
|
||||
const char* dtls_srtp_label = "EXTRACTOR-dtls_srtp";
|
||||
dtls_srtp_keys dtls_srtp_keying;
|
||||
#endif /* MBEDTLS_SSL_DTLS_SRTP */
|
||||
#endif /* MBEDTLS_SSL_EXPORT_KEYS */
|
||||
|
||||
#if defined(MBEDTLS_MEMORY_BUFFER_ALLOC_C)
|
||||
mbedtls_memory_buffer_alloc_init( alloc_buf, sizeof(alloc_buf) );
|
||||
@ -3164,7 +3202,14 @@ int main( int argc, char *argv[] )
|
||||
nss_keylog_export,
|
||||
NULL );
|
||||
}
|
||||
#endif
|
||||
#if defined( MBEDTLS_SSL_DTLS_SRTP )
|
||||
else if( opt.use_srtp != 0 )
|
||||
{
|
||||
mbedtls_ssl_conf_export_keys_ext_cb( &conf, dtls_srtp_key_derivation,
|
||||
&dtls_srtp_keying );
|
||||
}
|
||||
#endif /* MBEDTLS_SSL_DTLS_SRTP */
|
||||
#endif /* MBEDTLS_SSL_EXPORT_KEYS */
|
||||
|
||||
#if defined(MBEDTLS_SSL_ALPN)
|
||||
if( opt.alpn_string != NULL )
|
||||
@ -3810,7 +3855,39 @@ handshake:
|
||||
}
|
||||
mbedtls_printf("\n");
|
||||
}
|
||||
#endif
|
||||
|
||||
#if defined( MBEDTLS_SSL_DTLS_SRTP )
|
||||
else if( opt.use_srtp != 0 )
|
||||
{
|
||||
size_t j = 0;
|
||||
|
||||
if( ( ret = mbedtls_ssl_tls_prf( dtls_srtp_keying.tls_prf_type,
|
||||
dtls_srtp_keying.master_secret,
|
||||
sizeof( dtls_srtp_keying.master_secret ),
|
||||
dtls_srtp_label,
|
||||
dtls_srtp_keying.randbytes,
|
||||
sizeof( dtls_srtp_keying.randbytes ),
|
||||
dtls_srtp_key_material,
|
||||
sizeof( dtls_srtp_key_material ) ) )
|
||||
!= 0 )
|
||||
{
|
||||
mbedtls_printf( " failed\n ! mbedtls_ssl_tls_prf returned -0x%x\n\n",
|
||||
-ret );
|
||||
goto exit;
|
||||
}
|
||||
|
||||
mbedtls_printf( " DTLS-SRTP key material is:" );
|
||||
for( j = 0; j < sizeof( dtls_srtp_key_material ); j++ )
|
||||
{
|
||||
if( j % 8 == 0 )
|
||||
mbedtls_printf("\n ");
|
||||
mbedtls_printf("%02x ", dtls_srtp_key_material[j] );
|
||||
}
|
||||
|
||||
mbedtls_printf("\n");
|
||||
}
|
||||
#endif /* MBEDTLS_SSL_DTLS_SRTP */
|
||||
#endif /* MBEDTLS_SSL_EXPORT_KEYS */
|
||||
|
||||
#if defined(MBEDTLS_SSL_DTLS_CONNECTION_ID)
|
||||
ret = report_cid_usage( &ssl, "initial handshake" );
|
||||
|
||||
Loading…
Reference in New Issue
Block a user