/*

 * Copyright (C) 2019 Red Hat, Inc.

 *

 * Author: Nikos Mavrogiannopoulos

 *

 * This file is part of GnuTLS.

 *

 * GnuTLS is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License as published by

 * the Free Software Foundation; either version 3 of the License, or

 * (at your option) any later version.

 *

 * GnuTLS 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

 * 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 <https://www.gnu.org/licenses/>

 *

 */

#ifdef HAVE_CONFIG_H

#include <config.h>

#endif

#include <stdio.h>

#include <stdlib.h>

#include <stdint.h>

#include <string.h>

#include <errno.h>

#include <gnutls/gnutls.h>

#include "utils.h"

#include "eagain-common.h"

#include "cert-common.h"

#include "tls13/ext-parse.h"

#include <assert.h>

const char *side;

static void tls_log_func(int level, const char *str)

{

	fprintf(stderr, "%s|<%d>| %s", side, level, str);

}

static int server_handshake_callback(gnutls_session_t session, unsigned int htype,

				     unsigned post, unsigned int incoming,

				     const gnutls_datum_t *msg)

{

	unsigned pos;

	gnutls_datum_t mmsg;

	assert(post && htype == GNUTLS_HANDSHAKE_SERVER_HELLO);

	switch (htype) {

	case GNUTLS_HANDSHAKE_SERVER_HELLO:

		assert(msg->size >= HANDSHAKE_SESSION_ID_POS);

		pos = HANDSHAKE_SESSION_ID_POS;

		SKIP8(pos, msg->size);

		pos += 3; /* ciphersuite + compression */

		mmsg.data = &msg->data[pos];

		mmsg.size = msg->size - pos;

		if (pos != msg->size) {

			if (pos < msg->size-1) {

				fprintf(stderr, "additional bytes: %.2x%.2x\n", mmsg.data[0], mmsg.data[1]);

			}

			fail("the server hello contains additional bytes\n");

		}

		break;

	}

	return 0;

}

static int client_handshake_callback(gnutls_session_t session, unsigned int htype,

				     unsigned post, unsigned int incoming,

				     const gnutls_datum_t *msg)

{

	unsigned pos;

	gnutls_datum_t mmsg;

	assert(!post && htype == GNUTLS_HANDSHAKE_CLIENT_HELLO);

	switch (htype) {

	case GNUTLS_HANDSHAKE_CLIENT_HELLO:

		assert(msg->size >= HANDSHAKE_SESSION_ID_POS);

		pos = HANDSHAKE_SESSION_ID_POS;

		SKIP8(pos, msg->size);

		SKIP16(pos, msg->size);

		SKIP8(pos, msg->size);

		mmsg.data = &msg->data[pos];

		mmsg.size = msg->size - pos;

		if (pos != msg->size) {

			if (pos < msg->size-1) {

				fprintf(stderr, "additional bytes: %.2x%.2x\n", mmsg.data[0], mmsg.data[1]);

			}

			fail("the client hello contains additional bytes\n");

		}

		break;

	}

	return 0;

}

static

void start(const char *prio, gnutls_protocol_t exp_version)

{

	int ret;

	/* Server stuff. */

	gnutls_certificate_credentials_t serverx509cred;

	gnutls_session_t server;

	int sret = GNUTLS_E_AGAIN;

	/* Client stuff. */

	gnutls_certificate_credentials_t clientx509cred;

	gnutls_session_t client;

	int cret = GNUTLS_E_AGAIN;

	success("trying %s\n", prio);

	/* General init. */

	global_init();

	gnutls_global_set_log_function(tls_log_func);

	if (debug)

		gnutls_global_set_log_level(6);

	/* Init server */

	gnutls_certificate_allocate_credentials(&serverx509cred);

	gnutls_certificate_set_x509_key_mem(serverx509cred,

					    &server_cert, &server_key,

					    GNUTLS_X509_FMT_PEM);

	gnutls_init(&server, GNUTLS_SERVER);

	gnutls_credentials_set(server, GNUTLS_CRD_CERTIFICATE,

				serverx509cred);

	assert(gnutls_priority_set_direct(server, prio, NULL)>=0);

	gnutls_transport_set_push_function(server, server_push);

	gnutls_transport_set_pull_function(server, server_pull);

	gnutls_transport_set_ptr(server, server);

	gnutls_handshake_set_hook_function(server,

					   GNUTLS_HANDSHAKE_SERVER_HELLO,

					   GNUTLS_HOOK_POST,

					   server_handshake_callback);

	/* Init client */

	ret = gnutls_certificate_allocate_credentials(&clientx509cred);

	if (ret < 0)

		exit(1);

	ret = gnutls_certificate_set_x509_trust_mem(clientx509cred, &ca_cert, GNUTLS_X509_FMT_PEM);

	if (ret < 0)

		exit(1);

	ret = gnutls_init(&client, GNUTLS_CLIENT);

	if (ret < 0)

		exit(1);

	ret = gnutls_credentials_set(client, GNUTLS_CRD_CERTIFICATE,

				clientx509cred);

	if (ret < 0)

		exit(1);

	gnutls_priority_set_direct(client, prio, NULL);

	gnutls_transport_set_push_function(client, client_push);

	gnutls_transport_set_pull_function(client, client_pull);

	gnutls_transport_set_ptr(client, client);

	gnutls_handshake_set_hook_function(client,

					   GNUTLS_HANDSHAKE_CLIENT_HELLO,

					   GNUTLS_HOOK_PRE,

					   client_handshake_callback);

	HANDSHAKE(client, server);

	/* check gnutls_certificate_get_ours() - client side */

	{

		const gnutls_datum_t *mcert;

		mcert = gnutls_certificate_get_ours(client);

		if (mcert != NULL) {

			fail("gnutls_certificate_get_ours(): failed\n");

			exit(1);

		}

	}

	assert(gnutls_protocol_get_version(server) == exp_version);

	assert(gnutls_certificate_type_get(server)==GNUTLS_CRT_X509);

	assert(gnutls_certificate_type_get(client)==GNUTLS_CRT_X509);

	gnutls_bye(client, GNUTLS_SHUT_RDWR);

	gnutls_bye(server, GNUTLS_SHUT_RDWR);

	gnutls_deinit(client);

	gnutls_deinit(server);

	gnutls_certificate_free_credentials(serverx509cred);

	gnutls_certificate_free_credentials(clientx509cred);

	gnutls_global_deinit();

	reset_buffers();

}

void doit(void)

{

	start("NORMAL:-VERS-ALL:+VERS-TLS1.0:%NO_EXTENSIONS", GNUTLS_TLS1_0);

	start("NORMAL:-VERS-ALL:+VERS-TLS1.1:%NO_EXTENSIONS", GNUTLS_TLS1_1);

	start("NORMAL:-VERS-ALL:+VERS-TLS1.2:%NO_EXTENSIONS", GNUTLS_TLS1_2);

	start("NORMAL:-VERS-ALL:+VERS-TLS1.3:+VERS-TLS1.2:%NO_EXTENSIONS", GNUTLS_TLS1_2);

}