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Merge pull request #5313 from gilles-peskine-arm/missing-ret-check-mbedtls_md_hmac

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Check HMAC return values
This commit is contained in:
Dave Rodgman
2021-12-13 10:51:27 +00:00
committed by GitHub
parent c11192fcb2 ecf6bebb9c
commit 050ad4bb50
5 changed files with 131 additions and 31 deletions
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44
library/ssl_tls.c
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@ -500,19 +500,37 @@ static int tls_prf_generic( mbedtls_md_type_t md_type,
if ( ( ret = mbedtls_md_setup( &md_ctx, md_info, 1 ) ) != 0 )
goto exit;
mbedtls_md_hmac_starts( &md_ctx, secret, slen );
mbedtls_md_hmac_update( &md_ctx, tmp + md_len, nb );
mbedtls_md_hmac_finish( &md_ctx, tmp );
ret = mbedtls_md_hmac_starts( &md_ctx, secret, slen );
if( ret != 0 )
goto exit;
ret = mbedtls_md_hmac_update( &md_ctx, tmp + md_len, nb );
if( ret != 0 )
goto exit;
ret = mbedtls_md_hmac_finish( &md_ctx, tmp );
if( ret != 0 )
goto exit;
for( i = 0; i < dlen; i += md_len )
{
mbedtls_md_hmac_reset ( &md_ctx );
mbedtls_md_hmac_update( &md_ctx, tmp, md_len + nb );
mbedtls_md_hmac_finish( &md_ctx, h_i );
ret = mbedtls_md_hmac_reset ( &md_ctx );
if( ret != 0 )
goto exit;
ret = mbedtls_md_hmac_update( &md_ctx, tmp, md_len + nb );
if( ret != 0 )
goto exit;
ret = mbedtls_md_hmac_finish( &md_ctx, h_i );
if( ret != 0 )
goto exit;
mbedtls_md_hmac_reset ( &md_ctx );
mbedtls_md_hmac_update( &md_ctx, tmp, md_len );
mbedtls_md_hmac_finish( &md_ctx, tmp );
ret = mbedtls_md_hmac_reset ( &md_ctx );
if( ret != 0 )
goto exit;
ret = mbedtls_md_hmac_update( &md_ctx, tmp, md_len );
if( ret != 0 )
goto exit;
ret = mbedtls_md_hmac_finish( &md_ctx, tmp );
if( ret != 0 )
goto exit;
k = ( i + md_len > dlen ) ? dlen % md_len : md_len;
@ -958,8 +976,12 @@ static int ssl_tls12_populate_transform( mbedtls_ssl_transform *transform,
For AEAD-based ciphersuites, there is nothing to do here. */
if( mac_key_len != 0 )
{
mbedtls_md_hmac_starts( &transform->md_ctx_enc, mac_enc, mac_key_len );
mbedtls_md_hmac_starts( &transform->md_ctx_dec, mac_dec, mac_key_len );
ret = mbedtls_md_hmac_starts( &transform->md_ctx_enc, mac_enc, mac_key_len );
if( ret != 0 )
goto end;
ret = mbedtls_md_hmac_starts( &transform->md_ctx_dec, mac_dec, mac_key_len );
if( ret != 0 )
goto end;
}
#endif
#endif /* MBEDTLS_SSL_SOME_SUITES_USE_MAC */