Minor fix and improvements
Signed-off-by: Johan Pascal <johan.pascal@belledonne-communications.com>
diff --git a/library/ssl_srv.c b/library/ssl_srv.c
index 5c56a70..007d9e4 100644
--- a/library/ssl_srv.c
+++ b/library/ssl_srv.c
@@ -810,8 +810,9 @@
* Min length is 5: at least one protection profile(2 bytes)
* and length(2 bytes) + srtp_mki length(1 byte)
* Check here that we have at least 2 bytes of protection profiles length
+ * and one of srtp_mki length
*/
- if( len < 2 )
+ if( len < size_of_lengths )
{
mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE );
@@ -824,8 +825,8 @@
profile_length = ( buf[0] << 8 ) | buf[1];
buf += 2;
- /* check the buffer size: at least profiles + profile and mki length */
- if( profile_length + size_of_lengths > len ||
+ /* The profile length cannot be bigger than input buffer size - lengths fields */
+ if( profile_length > len - size_of_lengths ||
profile_length % 2 != 0 ) /* profiles are 2 bytes long, so the length must be even */
{
mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
@@ -836,9 +837,9 @@
* parse the extension list values are defined in
* http://www.iana.org/assignments/srtp-protection/srtp-protection.xhtml
*/
- for( j=0; j < profile_length; j += 2 )
+ for( j = 0; j < profile_length; j += 2 )
{
- uint16_t protection_profile_value = buf[j] << 8 | buf[j+1];
+ uint16_t protection_profile_value = buf[j] << 8 | buf[j + 1];
client_protection = mbedtls_ssl_check_srtp_profile_value( protection_profile_value );
if( client_protection != MBEDTLS_TLS_SRTP_UNSET )
@@ -884,10 +885,7 @@
{
ssl->dtls_srtp_info.mki_len = mki_length;
- for( i=0; i < mki_length; i++ )
- {
- ssl->dtls_srtp_info.mki_value[i] = buf[i];
- }
+ memcpy(ssl->dtls_srtp_info.mki_value, buf, mki_length);
MBEDTLS_SSL_DEBUG_BUF( 3, "using mki", ssl->dtls_srtp_info.mki_value,
ssl->dtls_srtp_info.mki_len );
@@ -2067,9 +2065,12 @@
case MBEDTLS_TLS_EXT_USE_SRTP:
MBEDTLS_SSL_DEBUG_MSG( 3, ( "found use_srtp extension" ) );
- ret = ssl_parse_use_srtp_ext( ssl, ext + 4, ext_size );
- if ( ret != 0 )
- return( ret );
+ if ( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
+ {
+ ret = ssl_parse_use_srtp_ext( ssl, ext + 4, ext_size );
+ if ( ret != 0 )
+ return( ret );
+ }
break;
#endif /* MBEDTLS_SSL_DTLS_SRTP */
@@ -2991,8 +2992,11 @@
#endif
#if defined(MBEDTLS_SSL_DTLS_SRTP)
- ssl_write_use_srtp_ext( ssl, p + 2 + ext_len, &olen );
- ext_len += olen;
+ if ( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
+ {
+ ssl_write_use_srtp_ext( ssl, p + 2 + ext_len, &olen );
+ ext_len += olen;
+ }
#endif
MBEDTLS_SSL_DEBUG_MSG( 3, ( "server hello, total extension length: %d", ext_len ) );