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Don't parse or write extensions in SSLv3

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In mbed TLS 1.3 a check went missing disabling the use of extensions
in SERVER_HELLO for SSLv3, causing the "SSLv3 with extensions" test
case from ssl-opt.sh to fail. This commit fixes that and adds a dump
of all extensions present in the client hello that the same test case
also checks for.
This commit is contained in:
Hanno Becker 2017-06-09 15:30:29 +01:00
parent ca3ff06cea
commit 5745778333
1 changed files with 12 additions and 0 deletions
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12
library/ssl_srv.c
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@ -1632,6 +1632,8 @@ static int ssl_parse_client_hello( ssl_context *ssl )
ext = buf + 44 + sess_len + ciph_len + comp_len;
SSL_DEBUG_BUF( 3, "client hello extensions", ext, ext_len );
while( ext_len )
{
unsigned int ext_id = ( ( ext[0] << 8 )
@ -2328,6 +2330,12 @@ static int ssl_write_server_hello( ssl_context *ssl )
SSL_DEBUG_MSG( 3, ( "server hello, compress alg.: 0x%02X",
ssl->session_negotiate->compression ) );
/* Do not write the extensions if the protocol is SSLv3 */
#if defined(POLARSSL_SSL_PROTO_SSL3)
if( ( ssl->major_ver != 3 ) || ( ssl->minor_ver != 0 ) )
{
#endif
/*
* First write extensions, then the total length
*/
@ -2378,6 +2386,10 @@ static int ssl_write_server_hello( ssl_context *ssl )
p += ext_len;
}
#if defined(POLARSSL_SSL_PROTO_SSL3)
}
#endif
ssl->out_msglen = p - buf;
ssl->out_msgtype = SSL_MSG_HANDSHAKE;
ssl->out_msg[0] = SSL_HS_SERVER_HELLO;