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ssl_srv: write & parse session ticket ext & msg

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Manuel Pégourié-Gonnard 2013-08-01 11:47:56 +02:00 committed by Paul Bakker
parent 6377e41ef5
commit 7a358b8580
2 changed files with 110 additions and 1 deletions
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106
library/ssl_srv.c
View File

@ -323,6 +323,26 @@ static int ssl_parse_truncated_hmac_ext( ssl_context *ssl,
return( 0 );
}
static int ssl_parse_session_ticket_ext( ssl_context *ssl,
const unsigned char *buf,
size_t len )
{
/*
* Remember the client asked for a ticket
*/
ssl->handshake->new_session_ticket = 1;
if( len == 0 )
return( 0 );
// TODO: verify the ticket, and if it is acceptable, use it to fill
// session_negotiated and set handshake->resume to 1
((void) buf);
((void) ssl);
return( 0 );
}
#if defined(POLARSSL_SSL_SRV_SUPPORT_SSLV2_CLIENT_HELLO)
static int ssl_parse_client_hello_v2( ssl_context *ssl )
{
@ -873,6 +893,14 @@ static int ssl_parse_client_hello( ssl_context *ssl )
return( ret );
break;
case TLS_EXT_SESSION_TICKET:
SSL_DEBUG_MSG( 3, ( "found session ticket extension" ) );
ret = ssl_parse_session_ticket_ext( ssl, ext + 4, ext_size );
if( ret != 0 )
return( ret );
break;
default:
SSL_DEBUG_MSG( 3, ( "unknown extension found: %d (ignoring)",
ext_id ) );
@ -1005,6 +1033,29 @@ static void ssl_write_truncated_hmac_ext( ssl_context *ssl,
*olen = 4;
}
static void ssl_write_session_ticket_ext( ssl_context *ssl,
unsigned char *buf,
size_t *olen )
{
unsigned char *p = buf;
if( ssl->handshake->new_session_ticket == 0 )
{
*olen = 0;
return;
}
SSL_DEBUG_MSG( 3, ( "server hello, adding session ticket extension" ) );
*p++ = (unsigned char)( ( TLS_EXT_SESSION_TICKET >> 8 ) & 0xFF );
*p++ = (unsigned char)( ( TLS_EXT_SESSION_TICKET ) & 0xFF );
*p++ = 0x00;
*p++ = 0x00;
*olen = 4;
}
static void ssl_write_renegotiation_ext( ssl_context *ssl,
unsigned char *buf,
size_t *olen )
@ -1179,6 +1230,9 @@ static int ssl_write_server_hello( ssl_context *ssl )
ssl_write_truncated_hmac_ext( ssl, p + 2 + ext_len, &olen );
ext_len += olen;
ssl_write_session_ticket_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 );
@ -2114,6 +2168,51 @@ static int ssl_parse_certificate_verify( ssl_context *ssl )
!POLARSSL_KEY_EXCHANGE_DHE_RSA_ENABLED &&
!POLARSSL_KEY_EXCHANGE_ECDHE_RSA_ENABLED */
static int ssl_write_new_session_ticket( ssl_context *ssl )
{
int ret;
SSL_DEBUG_MSG( 2, ( "=> write new session ticket" ) );
ssl->out_msgtype = SSL_MSG_HANDSHAKE;
ssl->out_msg[0] = SSL_HS_NEW_SESSION_TICKET;
/*
* struct {
* uint32 ticket_lifetime_hint;
* opaque ticket<0..2^16-1>;
* } NewSessionTicket;
*
* 4 . 7 ticket_lifetime_hint (0 = unspecified)
* 8 . 9 ticket_len (n)
* 10 . 9+n ticket content
*/
ssl->out_msg[4] = 0x00;
ssl->out_msg[5] = 0x00;
ssl->out_msg[6] = 0x00;
ssl->out_msg[7] = 0x00;
// TODO: generate and send actual ticket (empty for now)
ssl->out_msglen = 10 + 0;
ssl->out_msg[8] = 0x00;
ssl->out_msg[9] = 0x00;
SSL_DEBUG_BUF( 0, "out_msg", ssl->out_msg, ssl->out_msglen );
if( ( ret = ssl_write_record( ssl ) ) != 0 )
{
SSL_DEBUG_RET( 1, "ssl_write_record", ret );
return( ret );
}
ssl->state = SSL_SERVER_CHANGE_CIPHER_SPEC;
SSL_DEBUG_MSG( 2, ( "<= write new session ticket" ) );
return( 0 );
}
/*
* SSL handshake -- server side -- single step
*/
@ -2197,9 +2296,14 @@ int ssl_handshake_server_step( ssl_context *ssl )
break;
/*
* ==> ChangeCipherSpec
* ==> ( NewSessionTicket )
* ChangeCipherSpec
* Finished
*/
case SSL_SERVER_NEW_SESSION_TICKET:
ret = ssl_write_new_session_ticket( ssl );
break;
case SSL_SERVER_CHANGE_CIPHER_SPEC:
ret = ssl_write_change_cipher_spec( ssl );
break;

5
library/ssl_tls.c
View File

@ -2736,6 +2736,11 @@ int ssl_parse_finished( ssl_context *ssl )
if( ssl->endpoint == SSL_IS_SERVER )
ssl->state = SSL_HANDSHAKE_WRAPUP;
}
else if( ssl->endpoint == SSL_IS_SERVER &&
ssl->handshake->new_session_ticket != 0 )
{
ssl->state = SSL_SERVER_NEW_SESSION_TICKET;
}
else
ssl->state++;