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Remove SHA-1 in TLS by default

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Default to forbidding the use of SHA-1 in TLS where it is unsafe: for
certificate signing, and as the signature hash algorithm for the TLS
1.2 handshake signature. SHA-1 remains allowed in HMAC-SHA-1 in the
XXX_SHA ciphersuites and in the PRF for TLS <= 1.1.

For easy backward compatibility for use in controlled environments,
turn on the MBEDTLS_TLS_DEFAULT_ALLOW_SHA1 compiled-time option.
This commit is contained in:
Gilles Peskine 2017-05-04 16:17:21 +02:00 • committed by Manuel Pégourié-Gonnard
parent 23b33f8663
commit 5e79cb3662
4 changed files with 25 additions and 4 deletions
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2
library/ssl_tls.c
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@ -7162,7 +7162,7 @@ static int ssl_preset_default_hashes[] = {
MBEDTLS_MD_SHA256,
MBEDTLS_MD_SHA224,
#endif
#if defined(MBEDTLS_SHA1_C)
#if defined(MBEDTLS_SHA1_C) && defined(MBEDTLS_TLS_DEFAULT_ALLOW_SHA1)
MBEDTLS_MD_SHA1,
#endif
MBEDTLS_MD_NONE

6
library/x509_crt.c
View file

@ -85,9 +85,11 @@ static void mbedtls_zeroize( void *v, size_t n ) {
*/
const mbedtls_x509_crt_profile mbedtls_x509_crt_profile_default =
{
/* Hashes from SHA-1 and above */
#if defined(MBEDTLS_TLS_DEFAULT_ALLOW_SHA1)
/* Allow SHA-1 (weak, but still safe in controlled environments) */
MBEDTLS_X509_ID_FLAG( MBEDTLS_MD_SHA1 ) |
MBEDTLS_X509_ID_FLAG( MBEDTLS_MD_RIPEMD160 ) |
#endif
/* Only SHA-2 hashes */
MBEDTLS_X509_ID_FLAG( MBEDTLS_MD_SHA224 ) |
MBEDTLS_X509_ID_FLAG( MBEDTLS_MD_SHA256 ) |
MBEDTLS_X509_ID_FLAG( MBEDTLS_MD_SHA384 ) |