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Add ecc extensions only if ecc ciphersuite is used

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Fix compliancy to RFC4492. ECC extensions should be included
only if ec ciphersuites are used. Interoperability issue with
bouncy castle. #1157
This commit is contained in:
Ron Eldor 2018-02-14 19:30:48 +02:00
parent e8934313e7
commit b847d8f2a9
2 changed files with 22 additions and 6 deletions
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20
library/ssl_cli.c
View File

@ -678,6 +678,10 @@ static int ssl_write_client_hello( mbedtls_ssl_context *ssl )
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" ) );
@ -829,6 +833,11 @@ static int ssl_write_client_hello( mbedtls_ssl_context *ssl )
MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello, add ciphersuite: %2d",
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] );
@ -919,11 +928,14 @@ static int ssl_write_client_hello( mbedtls_ssl_context *ssl )
#endif
#if defined(MBEDTLS_ECDH_C) || defined(MBEDTLS_ECDSA_C)
ssl_write_supported_elliptic_curves_ext( ssl, p + 2 + ext_len, &olen );
ext_len += olen;
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;
ssl_write_supported_point_formats_ext( ssl, p + 2 + ext_len, &olen );
ext_len += olen;
}
#endif
#if defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH)

8
library/ssl_srv.c
View File

@ -2423,8 +2423,12 @@ static int ssl_write_server_hello( mbedtls_ssl_context *ssl )
#endif
#if defined(MBEDTLS_ECDH_C) || defined(MBEDTLS_ECDSA_C)
ssl_write_supported_point_formats_ext( ssl, p + 2 + ext_len, &olen );
ext_len += olen;
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_SSL_ALPN)