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Prepare for DTLS handshake reassembly

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Manuel Pégourié-Gonnard 2014-08-20 10:43:01 +02:00 committed by Paul Bakker
parent edcbe549fd
commit ed79a4bb14
1 changed files with 40 additions and 16 deletions
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56
library/ssl_tls.c
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@ -2124,20 +2124,55 @@ int ssl_write_record( ssl_context *ssl )
return( 0 );
}
#if defined(POLARSSL_SSL_PROTO_DTLS)
static int ssl_reassemble_dtls_handshake( ssl_context *ssl )
{
if( ssl->handshake == NULL )
{
SSL_DEBUG_MSG( 1, ( "not supported outside handshake (for now)" ) );
return( POLARSSL_ERR_SSL_FEATURE_UNAVAILABLE );
}
SSL_DEBUG_MSG( 1, ( "TODO (WIP)" ) );
return( POLARSSL_ERR_SSL_FEATURE_UNAVAILABLE );
}
#endif /* POLARSSL_SSL_PROTO_DTLS */
static int ssl_prepare_handshake_record( ssl_context *ssl )
{
ssl->in_hslen = ssl->transport == SSL_TRANSPORT_DATAGRAM ? 12 : 4;
ssl->in_hslen += ( ssl->in_msg[2] << 8 ) | ssl->in_msg[3];
ssl->in_hslen += ( ssl->in_msg[1] << 16 ) |
( ssl->in_msg[2] << 8 ) |
ssl->in_msg[3];
SSL_DEBUG_MSG( 3, ( "handshake message: msglen ="
" %d, type = %d, hslen = %d",
ssl->in_msglen, ssl->in_msg[0], ssl->in_hslen ) );
/* We don't handle handshake messages larger than one record (for now) */
if( ssl->in_msg[1] != 0 ||
ssl->in_msglen < ssl->in_hslen )
#if defined(POLARSSL_SSL_PROTO_DTLS)
if( ssl->transport == SSL_TRANSPORT_DATAGRAM )
{
SSL_DEBUG_MSG( 1, ( "handshake fragmentation not supported" ) );
int ret;
// TODO: DTLS: check message_seq
/* Is this message fragmented? */
if( ssl->in_msg[6] != 0 || ssl->in_msg[7] != 0 || ssl->in_msg[8] != 0 ||
memcmp( ssl->in_msg + 1, ssl->in_msg + 9, 3 ) != 0 )
{
if( ( ret = ssl_reassemble_dtls_handshake( ssl ) ) != 0 )
{
SSL_DEBUG_RET( 1, "ssl_reassemble_dtls_handshake", ret );
return( ret );
}
}
}
else
#endif /* POLARSSL_SSL_PROTO_DTLS */
/* With TLS we don't handle fragmentation (for now) */
if( ssl->in_msglen < ssl->in_hslen )
{
SSL_DEBUG_MSG( 1, ( "TLS handshake fragmentation not supported" ) );
return( POLARSSL_ERR_SSL_FEATURE_UNAVAILABLE );
}
@ -2155,17 +2190,6 @@ static int ssl_prepare_handshake_record( ssl_context *ssl )
! ( ssl->endpoint == SSL_IS_SERVER &&
ssl->state == SSL_HANDSHAKE_OVER ) )
{
// TODO: DTLS: check message_seq
/* For now we don't support fragmentation, so make sure
* fragment_offset == 0 and fragment_length == length */
if( ssl->in_msg[6] != 0 || ssl->in_msg[7] != 0 || ssl->in_msg[8] != 0 ||
memcmp( ssl->in_msg + 1, ssl->in_msg + 9, 3 ) != 0 )
{
SSL_DEBUG_MSG( 1, ( "handshake fragmentation not supported" ) );
return( POLARSSL_ERR_SSL_FEATURE_UNAVAILABLE );
}
memmove( ssl->in_msg + 4, ssl->in_msg + 12, ssl->in_hslen - 12 );
ssl->in_hslen -= 8;
}