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Added truncated hmac negociation (without effect)

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Manuel Pégourié-Gonnard 2013-07-19 11:41:43 +02:00 • committed by Paul Bakker
parent e980a994f0
commit 57c2852807
3 changed files with 108 additions and 0 deletions
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51
library/ssl_srv.c
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@ -306,6 +306,23 @@ static int ssl_parse_max_fragment_length_ext( ssl_context *ssl,
return( 0 );
}
static int ssl_parse_truncated_hmac_ext( ssl_context *ssl,
const unsigned char *buf,
size_t len )
{
if( len != 0 )
{
SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
return( POLARSSL_ERR_SSL_BAD_HS_CLIENT_HELLO );
}
((void) buf);
ssl->session_negotiate->trunc_hmac = SSL_TRUNC_HMAC_ENABLED;
return( 0 );
}
#if defined(POLARSSL_SSL_SRV_SUPPORT_SSLV2_CLIENT_HELLO)
static int ssl_parse_client_hello_v2( ssl_context *ssl )
{
@ -848,6 +865,14 @@ static int ssl_parse_client_hello( ssl_context *ssl )
return( ret );
break;
case TLS_EXT_TRUNCATED_HMAC:
SSL_DEBUG_MSG( 3, ( "found truncated hmac extension" ) );
ret = ssl_parse_truncated_hmac_ext( ssl, ext + 4, ext_size );
if( ret != 0 )
return( ret );
break;
default:
SSL_DEBUG_MSG( 3, ( "unknown extension found: %d (ignoring)",
ext_id ) );
@ -957,6 +982,29 @@ have_ciphersuite:
return( 0 );
}
static void ssl_write_truncated_hmac_ext( ssl_context *ssl,
unsigned char *buf,
size_t *olen )
{
unsigned char *p = buf;
if( ssl->session_negotiate->trunc_hmac == SSL_TRUNC_HMAC_DISABLED )
{
*olen = 0;
return;
}
SSL_DEBUG_MSG( 3, ( "server hello, adding truncated hmac extension" ) );
*p++ = (unsigned char)( ( TLS_EXT_TRUNCATED_HMAC >> 8 ) & 0xFF );
*p++ = (unsigned char)( ( TLS_EXT_TRUNCATED_HMAC ) & 0xFF );
*p++ = 0x00;
*p++ = 0x00;
*olen = 4;
}
static void ssl_write_renegotiation_ext( ssl_context *ssl,
unsigned char *buf,
size_t *olen )
@ -1128,6 +1176,9 @@ static int ssl_write_server_hello( ssl_context *ssl )
ssl_write_max_fragment_length_ext( ssl, p + 2 + ext_len, &olen );
ext_len += olen;
ssl_write_truncated_hmac_ext( ssl, p + 2 + ext_len, &olen );
ext_len += olen;
SSL_DEBUG_MSG( 3, ( "server hello, total extension length: %d", ext_len ) );
*p++ = (unsigned char)( ( ext_len >> 8 ) & 0xFF );