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More ssl_parse_client_hello() adjustments

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Manuel Pégourié-Gonnard 2014-03-24 12:13:54 +01:00 committed by Paul Bakker
parent 4128aa71ee
commit d6b721c7ee
1 changed files with 33 additions and 19 deletions
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42
library/ssl_srv.c
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@ -1192,39 +1192,46 @@ static int ssl_parse_client_hello( ssl_context *ssl )
msg_len = ( ssl->in_len[0] << 8 ) | ssl->in_len[1];
/*
* Minimum length of a ClientHello is 42 plus headers (see below).
*/
if( msg_len > SSL_MAX_CONTENT_LEN ||
msg_len < 42 + ssl_hdr_len( ssl ) )
if( ssl->renegotiation == SSL_INITIAL_HANDSHAKE )
{
if( msg_len > SSL_MAX_CONTENT_LEN )
{
SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
return( POLARSSL_ERR_SSL_BAD_HS_CLIENT_HELLO );
}
if( ssl->renegotiation == SSL_INITIAL_HANDSHAKE &&
( ret = ssl_fetch_input( ssl, ssl_hdr_len( ssl ) + msg_len ) ) != 0 )
if( ( ret = ssl_fetch_input( ssl, ssl_hdr_len( ssl ) + msg_len ) ) != 0 )
{
SSL_DEBUG_RET( 1, "ssl_fetch_input", ret );
return( ret );
}
}
else
{
/* Set by ssl_read_record() */
msg_len = ssl->in_hslen;
}
buf = ssl->in_msg;
if( ssl->renegotiation == SSL_INITIAL_HANDSHAKE )
msg_len = ssl->in_left - ssl_hdr_len( ssl );
else
msg_len = ssl->in_msglen;
SSL_DEBUG_BUF( 4, "record contents", buf, msg_len );
ssl->handshake->update_checksum( ssl, buf, msg_len );
/*
* For DTLS, we move data so that is looks like TLS handshake format
* The DTLS handshake layer contains additional fields. Use them, then
* remove them so that it looks like TLS format to the rest of the code.
*/
#if defined(POLARSSL_SSL_PROTO_DTLS)
if( ssl->transport == SSL_TRANSPORT_DATAGRAM )
{
/* 1 (type) + 3 (len) + 2 (seq) + 3 (frag_offset) + 3 (frag_len) */
if( msg_len < 12 )
{
SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
return( POLARSSL_ERR_SSL_BAD_HS_CLIENT_HELLO );
}
// TODO: DTLS: check message_seq
/*
@ -1242,6 +1249,7 @@ static int ssl_parse_client_hello( ssl_context *ssl )
return( POLARSSL_ERR_SSL_FEATURE_UNAVAILABLE );
}
/* Remove the additional fields */
memmove( buf + 4, buf + 12, msg_len - 12 );
msg_len -= 8;
}
@ -1265,13 +1273,19 @@ static int ssl_parse_client_hello( ssl_context *ssl )
* .. . .. extensions (optional)
*
* Minimal length (with everything empty and extensions ommitted) is
* 4 + 2 + 32 + 1 + 2 + 1 = 42 bytes, which has been checked already,
* so we're fine until 'session id length' included.
* 4 + 2 + 32 + 1 + 2 + 1 = 42 bytes. Check that first, so that we can
* read at least up to session id length without worrying.
*/
/*
* Check the handshake type and message length
*/
if( msg_len < 42 )
{
SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
return( POLARSSL_ERR_SSL_BAD_HS_CLIENT_HELLO );
}
SSL_DEBUG_MSG( 3, ( "client hello v3, handshake type: %d", buf[0] ) );
if( buf[0] != SSL_HS_CLIENT_HELLO )