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Merged client ciphersuite order preference option
This commit is contained in:
Paul Bakker
commit
9dc53a9967
@ -3,6 +3,8 @@ PolarSSL ChangeLog (Sorted per branch, date)
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= PolarSSL 1.3 branch
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Features
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* EC key generation support in gen_key app
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* Support for adhering to client ciphersuite order preference
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(POLARSSL_SSL_SRV_RESPECT_CLIENT_PREFERENCE)
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Changes
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* gen_prime() speedup
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@ -631,6 +631,16 @@
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*/
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#define POLARSSL_SSL_SRV_SUPPORT_SSLV2_CLIENT_HELLO
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/**
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* \def POLARSSL_SSL_SRV_RESPECT_CLIENT_PREFERENCE
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*
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* Pick the ciphersuite according to the client's preferences rather than ours
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* in the SSL Server module (POLARSSL_SSL_SRV_C).
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*
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* Uncomment this macro to respect client's ciphersuite order
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*/
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//#define POLARSSL_SSL_SRV_RESPECT_CLIENT_PREFERENCE
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/**
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* \def POLARSSL_SSL_MAX_FRAGMENT_LENGTH
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*
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@ -680,6 +680,129 @@ static int ssl_parse_session_ticket_ext( ssl_context *ssl,
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}
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#endif /* POLARSSL_SSL_SESSION_TICKETS */
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/*
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* Auxiliary functions for ServerHello parsing and related actions
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*/
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#if defined(POLARSSL_X509_CRT_PARSE_C)
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/*
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* Return 1 if the given EC key uses the given curve, 0 otherwise
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*/
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#if defined(POLARSSL_ECDSA_C)
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static int ssl_key_matches_curves( pk_context *pk,
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const ecp_curve_info **curves )
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{
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const ecp_curve_info **crv = curves;
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ecp_group_id grp_id = pk_ec( *pk )->grp.id;
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while( *crv != NULL )
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{
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if( (*crv)->grp_id == grp_id )
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return( 1 );
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crv++;
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}
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return( 0 );
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}
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#endif /* POLARSSL_ECDSA_C */
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/*
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* Try picking a certificate for this ciphersuite,
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* return 0 on success and -1 on failure.
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*/
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static int ssl_pick_cert( ssl_context *ssl,
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const ssl_ciphersuite_t * ciphersuite_info )
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{
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ssl_key_cert *cur, *list;
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pk_type_t pk_alg = ssl_get_ciphersuite_sig_pk_alg( ciphersuite_info );
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#if defined(POLARSSL_SSL_SERVER_NAME_INDICATION)
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if( ssl->handshake->sni_key_cert != NULL )
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list = ssl->handshake->sni_key_cert;
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else
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#endif
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list = ssl->handshake->key_cert;
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if( pk_alg == POLARSSL_PK_NONE )
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return( 0 );
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for( cur = list; cur != NULL; cur = cur->next )
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{
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if( ! pk_can_do( cur->key, pk_alg ) )
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continue;
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#if defined(POLARSSL_ECDSA_C)
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if( pk_alg == POLARSSL_PK_ECDSA )
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{
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if( ssl_key_matches_curves( cur->key, ssl->handshake->curves ) )
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break;
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}
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else
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#endif
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break;
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}
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if( cur == NULL )
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return( -1 );
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ssl->handshake->key_cert = cur;
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return( 0 );
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}
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#endif /* POLARSSL_X509_CRT_PARSE_C */
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/*
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* Check if a given ciphersuite is suitable for use with our config/keys/etc
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* Sets ciphersuite_info only if the suite matches.
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*/
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static int ssl_ciphersuite_match( ssl_context *ssl, int suite_id,
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const ssl_ciphersuite_t **ciphersuite_info )
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{
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const ssl_ciphersuite_t *suite_info;
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suite_info = ssl_ciphersuite_from_id( suite_id );
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if( suite_info == NULL )
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{
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SSL_DEBUG_MSG( 1, ( "ciphersuite info for %04x not found", suite_id ) );
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return( POLARSSL_ERR_SSL_BAD_INPUT_DATA );
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}
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if( suite_info->min_minor_ver > ssl->minor_ver ||
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suite_info->max_minor_ver < ssl->minor_ver )
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return( 0 );
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#if defined(POLARSSL_ECDH_C) || defined(POLARSSL_ECDSA_C)
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if( ssl_ciphersuite_uses_ec( suite_info ) &&
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( ssl->handshake->curves == NULL ||
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ssl->handshake->curves[0] == NULL ) )
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return( 0 );
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#endif
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#if defined(POLARSSL_KEY_EXCHANGE__SOME__PSK_ENABLED)
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/* If the ciphersuite requires a pre-shared key and we don't
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* have one, skip it now rather than failing later */
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if( ssl_ciphersuite_uses_psk( suite_info ) &&
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ssl->f_psk == NULL &&
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( ssl->psk == NULL || ssl->psk_identity == NULL ||
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ssl->psk_identity_len == 0 || ssl->psk_len == 0 ) )
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return( 0 );
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#endif
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#if defined(POLARSSL_X509_CRT_PARSE_C)
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/*
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* Final check: if ciphersuite requires us to have a
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* certificate/key of a particular type:
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* - select the appropriate certificate if we have one, or
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* - try the next ciphersuite if we don't
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* This must be done last since we modify the key_cert list.
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*/
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if( ssl_pick_cert( ssl, suite_info ) != 0 )
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return( 0 );
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#endif
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*ciphersuite_info = suite_info;
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return( 0 );
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}
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#if defined(POLARSSL_SSL_SRV_SUPPORT_SSLV2_CLIENT_HELLO)
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static int ssl_parse_client_hello_v2( ssl_context *ssl )
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{
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@ -851,31 +974,28 @@ static int ssl_parse_client_hello_v2( ssl_context *ssl )
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}
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ciphersuites = ssl->ciphersuite_list[ssl->minor_ver];
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ciphersuite_info = NULL;
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#if defined(POLARSSL_SSL_SRV_RESPECT_CLIENT_PREFERENCE)
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for( j = 0, p = buf + 6; j < ciph_len; j += 3, p += 3 )
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{
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for( i = 0; ciphersuites[i] != 0; i++ )
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#else
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for( i = 0; ciphersuites[i] != 0; i++ )
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{
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for( j = 0, p = buf + 6; j < ciph_len; j += 3, p += 3 )
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#endif
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{
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// Only allow non-ECC ciphersuites as we do not have extensions
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//
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if( p[0] == 0 && p[1] == 0 &&
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( ( ciphersuites[i] >> 8 ) & 0xFF ) == 0 &&
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p[2] == ( ciphersuites[i] & 0xFF ) )
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{
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ciphersuite_info = ssl_ciphersuite_from_id( ciphersuites[i] );
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if( p[0] != 0 ||
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p[1] != ( ( ciphersuites[i] >> 8 ) & 0xFF ) ||
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p[2] != ( ( ciphersuites[i] ) & 0xFF ) )
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continue;
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if( ciphersuite_info == NULL )
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{
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SSL_DEBUG_MSG( 1, ( "ciphersuite info for %02x not found",
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ciphersuites[i] ) );
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return( POLARSSL_ERR_SSL_BAD_INPUT_DATA );
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}
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if( ciphersuite_info->min_minor_ver > ssl->minor_ver ||
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ciphersuite_info->max_minor_ver < ssl->minor_ver )
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continue;
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if( ( ret = ssl_ciphersuite_match( ssl, ciphersuites[i],
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&ciphersuite_info ) ) != 0 )
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return( ret );
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if( ciphersuite_info != NULL )
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goto have_ciphersuite_v2;
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}
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}
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}
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@ -911,69 +1031,6 @@ have_ciphersuite_v2:
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}
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#endif /* POLARSSL_SSL_SRV_SUPPORT_SSLV2_CLIENT_HELLO */
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#if defined(POLARSSL_X509_CRT_PARSE_C)
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#if defined(POLARSSL_ECDSA_C)
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static int ssl_key_matches_curves( pk_context *pk,
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const ecp_curve_info **curves )
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{
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const ecp_curve_info **crv = curves;
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ecp_group_id grp_id = pk_ec( *pk )->grp.id;
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while( *crv != NULL )
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{
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if( (*crv)->grp_id == grp_id )
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return( 1 );
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crv++;
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}
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return( 0 );
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}
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#endif /* POLARSSL_ECDSA_C */
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/*
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* Try picking a certificate for this ciphersuite,
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* return 0 on success and -1 on failure.
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*/
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static int ssl_pick_cert( ssl_context *ssl,
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const ssl_ciphersuite_t * ciphersuite_info )
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{
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ssl_key_cert *cur, *list;
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pk_type_t pk_alg = ssl_get_ciphersuite_sig_pk_alg( ciphersuite_info );
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#if defined(POLARSSL_SSL_SERVER_NAME_INDICATION)
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if( ssl->handshake->sni_key_cert != NULL )
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list = ssl->handshake->sni_key_cert;
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else
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#endif
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list = ssl->handshake->key_cert;
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if( pk_alg == POLARSSL_PK_NONE )
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return( 0 );
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for( cur = list; cur != NULL; cur = cur->next )
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{
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if( ! pk_can_do( cur->key, pk_alg ) )
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continue;
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#if defined(POLARSSL_ECDSA_C)
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if( pk_alg == POLARSSL_PK_ECDSA )
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{
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if( ssl_key_matches_curves( cur->key, ssl->handshake->curves ) )
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break;
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}
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else
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#endif
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break;
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}
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if( cur == NULL )
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return( -1 );
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ssl->handshake->key_cert = cur;
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return( 0 );
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}
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#endif /* POLARSSL_X509_CRT_PARSE_C */
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static int ssl_parse_client_hello( ssl_context *ssl )
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{
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int ret;
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@ -1372,58 +1429,27 @@ static int ssl_parse_client_hello( ssl_context *ssl )
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* and certificate from the SNI callback triggered by the SNI extension.)
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*/
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ciphersuites = ssl->ciphersuite_list[ssl->minor_ver];
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ciphersuite_info = NULL;
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#if defined(POLARSSL_SSL_SRV_RESPECT_CLIENT_PREFERENCE)
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for( j = 0, p = buf + 41 + sess_len; j < ciph_len; j += 2, p += 2 )
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{
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for( i = 0; ciphersuites[i] != 0; i++ )
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#else
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for( i = 0; ciphersuites[i] != 0; i++ )
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{
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for( j = 0, p = buf + 41 + sess_len; j < ciph_len;
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j += 2, p += 2 )
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for( j = 0, p = buf + 41 + sess_len; j < ciph_len; j += 2, p += 2 )
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#endif
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{
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if( p[0] == ( ( ciphersuites[i] >> 8 ) & 0xFF ) &&
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p[1] == ( ( ciphersuites[i] ) & 0xFF ) )
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{
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ciphersuite_info = ssl_ciphersuite_from_id( ciphersuites[i] );
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if( p[0] != ( ( ciphersuites[i] >> 8 ) & 0xFF ) ||
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p[1] != ( ( ciphersuites[i] ) & 0xFF ) )
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continue;
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if( ciphersuite_info == NULL )
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{
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SSL_DEBUG_MSG( 1, ( "ciphersuite info for %04x not found",
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ciphersuites[i] ) );
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return( POLARSSL_ERR_SSL_BAD_INPUT_DATA );
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}
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if( ciphersuite_info->min_minor_ver > ssl->minor_ver ||
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ciphersuite_info->max_minor_ver < ssl->minor_ver )
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continue;
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#if defined(POLARSSL_ECDH_C) || defined(POLARSSL_ECDSA_C)
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if( ssl_ciphersuite_uses_ec( ciphersuite_info ) &&
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( ssl->handshake->curves == NULL ||
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ssl->handshake->curves[0] == NULL ) )
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continue;
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#endif
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#if defined(POLARSSL_KEY_EXCHANGE__SOME__PSK_ENABLED)
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/* If the ciphersuite requires a pre-shared key and we don't
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* have one, skip it now rather than failing later */
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if( ssl_ciphersuite_uses_psk( ciphersuite_info ) &&
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ssl->f_psk == NULL &&
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( ssl->psk == NULL || ssl->psk_identity == NULL ||
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ssl->psk_identity_len == 0 || ssl->psk_len == 0 ) )
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continue;
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#endif
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#if defined(POLARSSL_X509_CRT_PARSE_C)
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/*
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* Final check: if ciphersuite requires us to have a
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* certificate/key of a particular type:
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* - select the appropriate certificate if we have one, or
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* - try the next ciphersuite if we don't
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* This must be done last since we modify the key_cert list.
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*/
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if( ssl_pick_cert( ssl, ciphersuite_info ) != 0 )
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continue;
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#endif
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if( ( ret = ssl_ciphersuite_match( ssl, ciphersuites[i],
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&ciphersuite_info ) ) != 0 )
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return( ret );
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if( ciphersuite_info != NULL )
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goto have_ciphersuite;
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}
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}
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}
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