diff --git a/ChangeLog b/ChangeLog index 4065d041f..383ae3c08 100644 --- a/ChangeLog +++ b/ChangeLog @@ -1,5 +1,10 @@ mbed TLS ChangeLog (Sorted per branch, date) += mbed TLS 2.1.4 released 2015-12-xx + +Security + * Disable MD5 for handshake signatures by default. + = mbed TLS 2.1.3 released 2015-11-04 Security diff --git a/include/mbedtls/ssl.h b/include/mbedtls/ssl.h index 7ab960049..9cb714a69 100644 --- a/include/mbedtls/ssl.h +++ b/include/mbedtls/ssl.h @@ -1553,7 +1553,7 @@ void mbedtls_ssl_conf_curves( mbedtls_ssl_config *conf, #if defined(MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED) /** * \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 * for signatures during the handshake. Hashes for message diff --git a/library/ssl_tls.c b/library/ssl_tls.c index 04d6981d0..52a7ebfbf 100644 --- a/library/ssl_tls.c +++ b/library/ssl_tls.c @@ -7006,6 +7006,21 @@ void mbedtls_ssl_config_init( mbedtls_ssl_config *conf ) 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[] = { MBEDTLS_TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256, MBEDTLS_TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384, @@ -7162,7 +7177,7 @@ int mbedtls_ssl_config_defaults( mbedtls_ssl_config *conf, #endif #if defined(MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED) - conf->sig_hashes = mbedtls_md_list(); + conf->sig_hashes = ssl_preset_default_hashes; #endif #if defined(MBEDTLS_ECP_C)