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/*
* Copyright (C) 2015-2017 Red Hat, Inc.
*
* Author: Nikos Mavrogiannopoulos
*
* This file is part of GnuTLS.
*
* The GnuTLS is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public License
* as published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>
*
*/
/* Functions that relate to the TLS handshake procedure.
*/
#include "gnutls_int.h"
#include "errors.h"
#include "dh.h"
#include "debug.h"
#include "algorithms.h"
#include "cipher.h"
#include "buffers.h"
#include "mbuffers.h"
#include "kx.h"
#include "handshake.h"
#include "num.h"
#include "hash_int.h"
#include "db.h"
#include "extensions.h"
#include "supplemental.h"
#include "auth.h"
#include "sslv2_compat.h"
#include <auth/cert.h>
#include "constate.h"
#include <record.h>
#include <state.h>
#include <ext/srp.h>
#include <ext/session_ticket.h>
#include <ext/status_request.h>
#include <ext/safe_renegotiation.h>
#include <auth/anon.h> /* for gnutls_anon_server_credentials_t */
#include <auth/psk.h> /* for gnutls_psk_server_credentials_t */
#include <random.h>
#include <dtls.h>
#include "secrets.h"
/*
* _gnutls_tls13_handshake_client
* This function performs the client side of the handshake of the TLS/SSL protocol.
*/
int _gnutls_tls13_handshake_client(gnutls_session_t session)
{
int ret = 0;
switch (STATE) {
case STATE100:
/* RECV CERTIFICATE */
if (session->internals.resumed == RESUME_FALSE) /* if we are not resuming */
ret = _gnutls_recv_server_certificate(session);
STATE = STATE100;
IMED_RET("recv server certificate", ret, 1);
/* fall through */
case STATE101:
#ifdef ENABLE_OCSP
/* RECV CERTIFICATE STATUS */
if (session->internals.resumed == RESUME_FALSE) /* if we are not resuming */
ret =
_gnutls_recv_server_certificate_status
(session);
STATE = STATE101;
IMED_RET("recv server certificate", ret, 1);
#endif
/* fall through */
case STATE102:
ret = _gnutls_run_verify_callback(session, GNUTLS_CLIENT);
STATE = STATE102;
if (ret < 0)
return gnutls_assert_val(ret);
FALLTHROUGH;
case STATE103:
/* receive the server certificate request - if any
*/
ret = _gnutls_recv_server_crt_request(session);
STATE = STATE103;
IMED_RET("recv server certificate request message", ret,
1);
/* fall through */
case STATE104:
/* receive the server hello done */
ret =
_gnutls_recv_handshake(session,
GNUTLS_HANDSHAKE_SERVER_HELLO_DONE,
0, NULL);
STATE = STATE104;
IMED_RET("recv server hello done", ret, 1);
/* fall through */
case STATE105:
/* send our certificate - if any and if requested
*/
ret =
_gnutls_send_client_certificate(session,
AGAIN
(STATE105));
STATE = STATE105;
IMED_RET("send client certificate", ret, 0);
/* fall through */
case STATE106:
/* send client certificate verify */
ret =
_gnutls_send_client_certificate_verify(session,
AGAIN
(STATE106));
STATE = STATE106;
IMED_RET("send client certificate verify", ret, 1);
/* fall through */
#if 0
case STATE107:
ret = send_handshake_final(session, TRUE);
STATE = STATE107;
IMED_RET("send handshake final 2", ret, 1);
/* fall through */
case STATE108:
STATE = STATE108;
ret = recv_handshake_final(session, TRUE);
IMED_RET("recv handshake final", ret, 1);
#endif
STATE = STATE0;
/* fall through */
default:
break;
}
/* explicitly reset any false start flags */
session->internals.recv_state = RECV_STATE_0;
return 0;
}
static int generate_hs_traffic_keys(gnutls_session_t session)
{
int ret;
if (unlikely(session->key.key.size == 0))
return gnutls_assert_val(GNUTLS_E_INTERNAL_ERROR);
ret = _tls13_update_secret(session, session->key.key.data, session->key.key.size);
if (ret < 0) {
gnutls_assert();
return ret;
}
ret = _tls13_connection_state_init(session);
if (ret < 0) {
gnutls_assert();
return ret;
}
ret = _tls13_derive_secret(session, DERIVED_LABEL, sizeof(DERIVED_LABEL)-1,
NULL, 0, session->key.temp_secret);
if (ret < 0) {
gnutls_assert();
return ret;
}
return 0;
}
/*
* _gnutls_tls13_handshake_server
* This function does the server stuff of the handshake protocol.
*/
int _gnutls_tls13_handshake_server(gnutls_session_t session)
{
int ret = 0;
switch (STATE) {
case STATE100:
ret =
generate_hs_traffic_keys(session);
STATE = STATE100;
IMED_RET("generate session keys", ret, 0);
/* fall through */
case STATE101:
ret =
_gnutls_send_server_certificate(session,
AGAIN(STATE101));
STATE = STATE101;
IMED_RET("send server certificate", ret, 0);
/* fall through */
case STATE102:
ret =
_gnutls_send_server_crt_request(session,
AGAIN(STATE102));
STATE = STATE102;
IMED_RET("send server cert request", ret, 0);
/* fall through */
case STATE103:
ret = _gnutls_recv_client_certificate(session);
STATE = STATE103;
IMED_RET("recv client certificate", ret, 1);
/* fall through */
case STATE104:
ret = _gnutls_run_verify_callback(session, GNUTLS_SERVER);
STATE = STATE104;
if (ret < 0)
return gnutls_assert_val(ret);
/* fall through */
case STATE105:
/* receive the client certificate verify message */
ret =
_gnutls_recv_client_certificate_verify_message
(session);
STATE = STATE105;
IMED_RET("recv client certificate verify", ret, 1);
/* fall through */
STATE = STATE0;
/* fall through */
default:
break;
}
return 0;
}
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