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Merge 'iotssl-558-md5-tls-sigs-restricted'

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Simon Butcher 2015-12-23 18:33:54 +00:00
commit 4c2bfdbff6
4 changed files with 22 additions and 5 deletions
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2
ChangeLog
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@ -6,6 +6,8 @@ Security
* Fix potential double free when mbedtls_asn1_store_named_data() fails to * Fix potential double free when mbedtls_asn1_store_named_data() fails to
allocate memory. Only used for certificate generation, not triggerable allocate memory. Only used for certificate generation, not triggerable
remotely in SSL/TLS. Found by Rafał Przywara. #367 remotely in SSL/TLS. Found by Rafał Przywara. #367
* Disable MD5 handshake signatures in TLS 1.2 by default
(Reported by Karthikeyan Bhargavan and Gaëtan Leurent.)
Bugfix Bugfix
* Fix over-restrictive length limit in GCM. Found by Andreas-N. #362 * Fix over-restrictive length limit in GCM. Found by Andreas-N. #362

2
include/mbedtls/ssl.h
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@ -1611,7 +1611,7 @@ void mbedtls_ssl_conf_curves( mbedtls_ssl_config *conf,
#if defined(MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED) #if defined(MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED)
/** /**
* \brief Set the allowed hashes for signatures during the handshake. * \brief Set the allowed hashes for signatures during the handshake.
* (Default: all available hashes.) * (Default: all available hashes except MD5.)
* *
* \note This only affects which hashes are offered and can be used * \note This only affects which hashes are offered and can be used
* for signatures during the handshake. Hashes for message * for signatures during the handshake. Hashes for message

6
library/ssl_cli.c
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@ -2096,7 +2096,7 @@ static int ssl_parse_signature_algorithm( mbedtls_ssl_context *ssl,
*/ */
if( ( *md_alg = mbedtls_ssl_md_alg_from_hash( (*p)[0] ) ) == MBEDTLS_MD_NONE ) if( ( *md_alg = mbedtls_ssl_md_alg_from_hash( (*p)[0] ) ) == MBEDTLS_MD_NONE )
{ {
MBEDTLS_SSL_DEBUG_MSG( 2, ( "Server used unsupported " MBEDTLS_SSL_DEBUG_MSG( 1, ( "Server used unsupported "
"HashAlgorithm %d", *(p)[0] ) ); "HashAlgorithm %d", *(p)[0] ) );
return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_KEY_EXCHANGE ); return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_KEY_EXCHANGE );
} }
@ -2106,7 +2106,7 @@ static int ssl_parse_signature_algorithm( mbedtls_ssl_context *ssl,
*/ */
if( ( *pk_alg = mbedtls_ssl_pk_alg_from_sig( (*p)[1] ) ) == MBEDTLS_PK_NONE ) if( ( *pk_alg = mbedtls_ssl_pk_alg_from_sig( (*p)[1] ) ) == MBEDTLS_PK_NONE )
{ {
MBEDTLS_SSL_DEBUG_MSG( 2, ( "server used unsupported " MBEDTLS_SSL_DEBUG_MSG( 1, ( "server used unsupported "
"SignatureAlgorithm %d", (*p)[1] ) ); "SignatureAlgorithm %d", (*p)[1] ) );
return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_KEY_EXCHANGE ); return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_KEY_EXCHANGE );
} }
@ -2116,7 +2116,7 @@ static int ssl_parse_signature_algorithm( mbedtls_ssl_context *ssl,
*/ */
if( mbedtls_ssl_check_sig_hash( ssl, *md_alg ) != 0 ) if( mbedtls_ssl_check_sig_hash( ssl, *md_alg ) != 0 )
{ {
MBEDTLS_SSL_DEBUG_MSG( 2, ( "server used HashAlgorithm " MBEDTLS_SSL_DEBUG_MSG( 1, ( "server used HashAlgorithm "
"that was not offered" ) ); "that was not offered" ) );
return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_KEY_EXCHANGE ); return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_KEY_EXCHANGE );
} }

17
library/ssl_tls.c
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@ -7097,6 +7097,21 @@ void mbedtls_ssl_config_init( mbedtls_ssl_config *conf )
memset( conf, 0, sizeof( mbedtls_ssl_config ) ); memset( conf, 0, sizeof( mbedtls_ssl_config ) );
} }
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)
MBEDTLS_MD_SHA1,
#endif
MBEDTLS_MD_NONE
};
static int ssl_preset_suiteb_ciphersuites[] = { static int ssl_preset_suiteb_ciphersuites[] = {
MBEDTLS_TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256, MBEDTLS_TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256,
MBEDTLS_TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384, MBEDTLS_TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384,
@ -7253,7 +7268,7 @@ int mbedtls_ssl_config_defaults( mbedtls_ssl_config *conf,
#endif #endif
#if defined(MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED) #if defined(MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED)
conf->sig_hashes = mbedtls_md_list(); conf->sig_hashes = ssl_preset_default_hashes;
#endif #endif
#if defined(MBEDTLS_ECP_C) #if defined(MBEDTLS_ECP_C)