/*

 * Copyright (C) 2016 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 General Public License

 * along with GnuTLS; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA

 */

#ifdef HAVE_CONFIG_H

#include <config.h>

#endif

/* This program tests the MTU calculation in various cipher/mac algorithm combinations

 * in gnutls */

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#include <errno.h>

#include <gnutls/gnutls.h>

#include <gnutls/dtls.h>

#include "eagain-common.h"

#include "cert-common.h"

#include "utils.h"

#include <assert.h>

#define myfail(fmt, ...) \

	fail("%s: "fmt, name, ##__VA_ARGS__)

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

{

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

}

static void dtls_mtu_try(const char *name, const char *client_prio,

		unsigned link_mtu, unsigned tunnel_mtu)

{

	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;

	unsigned dmtu;

	unsigned i;

	/* General init. */

	gnutls_global_set_log_function(tls_log_func);

	if (debug)

		gnutls_global_set_log_level(6);

	reset_buffers();

	/* Init server */

	assert(gnutls_certificate_allocate_credentials(&serverx509cred)>=0);

	assert(gnutls_certificate_set_x509_key_mem(serverx509cred,

					    &server_cert, &server_key,

					    GNUTLS_X509_FMT_PEM) >= 0);

	assert(gnutls_init(&server, GNUTLS_SERVER|GNUTLS_DATAGRAM|GNUTLS_NONBLOCK) >= 0);

	gnutls_credentials_set(server, GNUTLS_CRD_CERTIFICATE,

				serverx509cred);

	assert(gnutls_priority_set_direct(server,

				   "NORMAL:+ANON-ECDH:+ANON-DH:+3DES-CBC:+ECDHE-RSA:+DHE-RSA:+RSA:+ECDHE-ECDSA:+SHA256:+CURVE-X25519",

				   NULL) >= 0);

	gnutls_transport_set_push_function(server, server_push);

	gnutls_transport_set_pull_function(server, server_pull);

	gnutls_transport_set_pull_timeout_function(server, server_pull_timeout_func);

	gnutls_transport_set_ptr(server, server);

	/* Init client */

	ret = gnutls_init(&client, GNUTLS_CLIENT|GNUTLS_DATAGRAM|GNUTLS_NONBLOCK);

	if (ret < 0)

		exit(1);

	assert(gnutls_certificate_allocate_credentials(&clientx509cred) >= 0);

	assert(gnutls_certificate_set_x509_trust_mem(clientx509cred, &ca_cert, GNUTLS_X509_FMT_PEM)>=0);

	assert(gnutls_credentials_set(client, GNUTLS_CRD_CERTIFICATE,

				clientx509cred) >= 0);

	gnutls_transport_set_push_function(client, client_push);

	gnutls_transport_set_pull_function(client, client_pull);

	gnutls_transport_set_pull_timeout_function(client, client_pull_timeout_func);

	gnutls_transport_set_ptr(client, client);

	ret = gnutls_priority_set_direct(client, client_prio, NULL);

	if (ret < 0) {

		fail("%s: error in priority setting\n", name);

		exit(1);

	}

	success("negotiating %s\n", name);

	HANDSHAKE_DTLS(client, server);

	gnutls_dtls_set_mtu(client, link_mtu);

	dmtu = gnutls_dtls_get_data_mtu(client);

	if (dmtu != tunnel_mtu) {

		fail("%s: Calculated MTU (%d) does not match expected (%d)\n", name, dmtu, tunnel_mtu);

	}

	{

		char *msg = gnutls_malloc(dmtu+1);

		assert(msg);

		memset(msg, 1, dmtu+1);

		ret = gnutls_record_send(client, msg, dmtu+1);

		if (ret != (int)GNUTLS_E_LARGE_PACKET) {

			myfail("could send larger packet than MTU (%d), ret: %d\n", dmtu, ret);

		}

		ret = gnutls_record_send(client, msg, dmtu);

		if (ret != (int)dmtu) {

			myfail("could not send %d bytes (sent %d)\n", dmtu, ret);

		}

		memset(msg, 2, dmtu);

		ret = gnutls_record_recv(server, msg, dmtu);

		if (ret != (int)dmtu) {

			myfail("could not receive %d bytes (received %d)\n", dmtu, ret);

		}

		for (i=0;i

			assert(msg[i]==1);

		gnutls_free(msg);

	}

	gnutls_dtls_set_data_mtu(client, link_mtu);

	dmtu = gnutls_dtls_get_data_mtu(client);

	if (dmtu != link_mtu) {

		if (gnutls_mac_get(client) == GNUTLS_MAC_AEAD)

			fail("%s: got MTU (%d) which does not match expected (%d)\n", name, dmtu, link_mtu);

		else if (dmtu < link_mtu)

			fail("%s: got MTU (%d) smaller than expected (%d)\n", name, dmtu, link_mtu);

	}

	gnutls_dtls_set_mtu(client, link_mtu);

	dmtu = gnutls_dtls_get_mtu(client);

	if (dmtu != link_mtu) {

		fail("%s: got MTU (%d) which does not match expected (%d)\n", name, dmtu, link_mtu);

	}

	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);

}

void doit(void)

{

	global_init();

	/* check padding in CBC */

	dtls_mtu_try("DTLS 1.2 with AES-128-CBC-HMAC-SHA1", "NORMAL:%NO_ETM:-VERS-ALL:+VERS-DTLS1.2:-CIPHER-ALL:+AES-128-CBC:-MAC-ALL:+SHA1", 1500, 1435);

	dtls_mtu_try("DTLS 1.2 with AES-128-CBC-HMAC-SHA1 - mtu:1501", "NORMAL:%NO_ETM:-VERS-ALL:+VERS-DTLS1.2:-CIPHER-ALL:+AES-128-CBC:-MAC-ALL:+SHA1", 1501, 1451);

	dtls_mtu_try("DTLS 1.2 with AES-128-CBC-HMAC-SHA1 - mtu:1502", "NORMAL:%NO_ETM:-VERS-ALL:+VERS-DTLS1.2:-CIPHER-ALL:+AES-128-CBC:-MAC-ALL:+SHA1", 1502, 1451);

	dtls_mtu_try("DTLS 1.2 with AES-128-CBC-HMAC-SHA1 - mtu:1503", "NORMAL:%NO_ETM:-VERS-ALL:+VERS-DTLS1.2:-CIPHER-ALL:+AES-128-CBC:-MAC-ALL:+SHA1", 1503, 1451);

	dtls_mtu_try("DTLS 1.2 with AES-128-CBC-HMAC-SHA1 - mtu:1504", "NORMAL:%NO_ETM:-VERS-ALL:+VERS-DTLS1.2:-CIPHER-ALL:+AES-128-CBC:-MAC-ALL:+SHA1", 1504, 1451);

	dtls_mtu_try("DTLS 1.2 with AES-128-CBC-HMAC-SHA1 - mtu:1505", "NORMAL:%NO_ETM:-VERS-ALL:+VERS-DTLS1.2:-CIPHER-ALL:+AES-128-CBC:-MAC-ALL:+SHA1", 1505, 1451);

	dtls_mtu_try("DTLS 1.2 with AES-128-CBC-HMAC-SHA1 - mtu:1506", "NORMAL:%NO_ETM:-VERS-ALL:+VERS-DTLS1.2:-CIPHER-ALL:+AES-128-CBC:-MAC-ALL:+SHA1", 1506, 1451);

	dtls_mtu_try("DTLS 1.2 with AES-128-CBC-HMAC-SHA1 - mtu:1507", "NORMAL:%NO_ETM:-VERS-ALL:+VERS-DTLS1.2:-CIPHER-ALL:+AES-128-CBC:-MAC-ALL:+SHA1", 1507, 1451);

	dtls_mtu_try("DTLS 1.2 with AES-128-CBC-HMAC-SHA1 - mtu:1508", "NORMAL:%NO_ETM:-VERS-ALL:+VERS-DTLS1.2:-CIPHER-ALL:+AES-128-CBC:-MAC-ALL:+SHA1", 1508, 1451);

	dtls_mtu_try("DTLS 1.2 with AES-128-CBC-HMAC-SHA1 - mtu:1509", "NORMAL:%NO_ETM:-VERS-ALL:+VERS-DTLS1.2:-CIPHER-ALL:+AES-128-CBC:-MAC-ALL:+SHA1", 1509, 1451);

	dtls_mtu_try("DTLS 1.2 with AES-128-CBC-HMAC-SHA1 - mtu:1510", "NORMAL:%NO_ETM:-VERS-ALL:+VERS-DTLS1.2:-CIPHER-ALL:+AES-128-CBC:-MAC-ALL:+SHA1", 1510, 1451);

	dtls_mtu_try("DTLS 1.2 with AES-128-CBC-HMAC-SHA1 - mtu:1511", "NORMAL:%NO_ETM:-VERS-ALL:+VERS-DTLS1.2:-CIPHER-ALL:+AES-128-CBC:-MAC-ALL:+SHA1", 1511, 1451);

	dtls_mtu_try("DTLS 1.2 with AES-128-CBC-HMAC-SHA1 - mtu:1512", "NORMAL:%NO_ETM:-VERS-ALL:+VERS-DTLS1.2:-CIPHER-ALL:+AES-128-CBC:-MAC-ALL:+SHA1", 1512, 1451);

	dtls_mtu_try("DTLS 1.2 with AES-128-CBC-HMAC-SHA1 - mtu:1513", "NORMAL:%NO_ETM:-VERS-ALL:+VERS-DTLS1.2:-CIPHER-ALL:+AES-128-CBC:-MAC-ALL:+SHA1", 1513, 1451);

	dtls_mtu_try("DTLS 1.2 with AES-128-CBC-HMAC-SHA1 - mtu:1514", "NORMAL:%NO_ETM:-VERS-ALL:+VERS-DTLS1.2:-CIPHER-ALL:+AES-128-CBC:-MAC-ALL:+SHA1", 1514, 1451);

	dtls_mtu_try("DTLS 1.2 with AES-128-CBC-HMAC-SHA1 - mtu:1515", "NORMAL:%NO_ETM:-VERS-ALL:+VERS-DTLS1.2:-CIPHER-ALL:+AES-128-CBC:-MAC-ALL:+SHA1", 1515, 1451);

	dtls_mtu_try("DTLS 1.2 with AES-128-CBC-HMAC-SHA1 - mtu:1516", "NORMAL:%NO_ETM:-VERS-ALL:+VERS-DTLS1.2:-CIPHER-ALL:+AES-128-CBC:-MAC-ALL:+SHA1", 1516, 1451);

	dtls_mtu_try("DTLS 1.2 with AES-128-CBC-HMAC-SHA1 - mtu:1517", "NORMAL:%NO_ETM:-VERS-ALL:+VERS-DTLS1.2:-CIPHER-ALL:+AES-128-CBC:-MAC-ALL:+SHA1", 1517, 1467);

	dtls_mtu_try("DTLS 1.2 with AES-128-CBC-HMAC-SHA1 - mtu:1518", "NORMAL:%NO_ETM:-VERS-ALL:+VERS-DTLS1.2:-CIPHER-ALL:+AES-128-CBC:-MAC-ALL:+SHA1", 1518, 1467);

	dtls_mtu_try("DTLS 1.2 with AES-128-CBC-HMAC-SHA1 - mtu:1519", "NORMAL:%NO_ETM:-VERS-ALL:+VERS-DTLS1.2:-CIPHER-ALL:+AES-128-CBC:-MAC-ALL:+SHA1", 1519, 1467);

	dtls_mtu_try("DTLS 1.2 with AES-128-CBC-HMAC-SHA1 - mtu:1520", "NORMAL:%NO_ETM:-VERS-ALL:+VERS-DTLS1.2:-CIPHER-ALL:+AES-128-CBC:-MAC-ALL:+SHA1", 1520, 1467);

	dtls_mtu_try("DTLS 1.2 with AES-128-CBC-HMAC-SHA1 - mtu:1521", "NORMAL:%NO_ETM:-VERS-ALL:+VERS-DTLS1.2:-CIPHER-ALL:+AES-128-CBC:-MAC-ALL:+SHA1", 1521, 1467);

	dtls_mtu_try("DTLS 1.2 with AES-128-CBC-HMAC-SHA1 - mtu:1522", "NORMAL:%NO_ETM:-VERS-ALL:+VERS-DTLS1.2:-CIPHER-ALL:+AES-128-CBC:-MAC-ALL:+SHA1", 1522, 1467);

	dtls_mtu_try("DTLS 1.2 with AES-128-CBC-HMAC-SHA1 - mtu:1523", "NORMAL:%NO_ETM:-VERS-ALL:+VERS-DTLS1.2:-CIPHER-ALL:+AES-128-CBC:-MAC-ALL:+SHA1", 1523, 1467);

	dtls_mtu_try("DTLS 1.2 with AES-128-CBC-HMAC-SHA1 - mtu:1524", "NORMAL:%NO_ETM:-VERS-ALL:+VERS-DTLS1.2:-CIPHER-ALL:+AES-128-CBC:-MAC-ALL:+SHA1", 1524, 1467);

	dtls_mtu_try("DTLS 1.2 with AES-128-CBC-HMAC-SHA1 - mtu:1525", "NORMAL:%NO_ETM:-VERS-ALL:+VERS-DTLS1.2:-CIPHER-ALL:+AES-128-CBC:-MAC-ALL:+SHA1", 1525, 1467);

	dtls_mtu_try("DTLS 1.2 with AES-128-CBC-HMAC-SHA1 - mtu:1526", "NORMAL:%NO_ETM:-VERS-ALL:+VERS-DTLS1.2:-CIPHER-ALL:+AES-128-CBC:-MAC-ALL:+SHA1", 1526, 1467);

	dtls_mtu_try("DTLS 1.2 with AES-128-CBC-HMAC-SHA1 - mtu:1536", "NORMAL:%NO_ETM:-VERS-ALL:+VERS-DTLS1.2:-CIPHER-ALL:+AES-128-CBC:-MAC-ALL:+SHA1", 1536, 1483);

	dtls_mtu_try("DTLS 1.2 with AES-128-CBC-HMAC-SHA256", "NORMAL:%NO_ETM:-VERS-ALL:+VERS-DTLS1.2:-CIPHER-ALL:+AES-128-CBC:-MAC-ALL:+SHA256", 1500, 1423);

	dtls_mtu_try("DTLS 1.2 with 3DES-CBC-HMAC-SHA1", "NORMAL:%NO_ETM:-VERS-ALL:+VERS-DTLS1.2:-CIPHER-ALL:+3DES-CBC:-MAC-ALL:+SHA1", 1500, 1451);

	/* check non-CBC ciphers */

	dtls_mtu_try("DTLS 1.2 with AES-128-GCM", "NORMAL:-VERS-ALL:+VERS-DTLS1.2:-CIPHER-ALL:+AES-128-GCM", 1500, 1463);

	if (!gnutls_fips140_mode_enabled())

		dtls_mtu_try("DTLS 1.2 with CHACHA20-POLY1305", "NORMAL:-VERS-ALL:+VERS-DTLS1.2:-CIPHER-ALL:+CHACHA20-POLY1305", 1500, 1471);

	/* check EtM CBC */

	dtls_mtu_try("DTLS 1.2/EtM with AES-128-CBC-HMAC-SHA1", "NORMAL:-VERS-ALL:+VERS-DTLS1.2:-CIPHER-ALL:+AES-128-CBC:-MAC-ALL:+SHA1", 1500, 1439);

	dtls_mtu_try("DTLS 1.2 with AES-128-CBC-HMAC-SHA1 - mtu:1501", "NORMAL:-VERS-ALL:+VERS-DTLS1.2:-CIPHER-ALL:+AES-128-CBC:-MAC-ALL:+SHA1", 1501, 1439);

	dtls_mtu_try("DTLS 1.2 with AES-128-CBC-HMAC-SHA1 - mtu:1502", "NORMAL:-VERS-ALL:+VERS-DTLS1.2:-CIPHER-ALL:+AES-128-CBC:-MAC-ALL:+SHA1", 1502, 1439);

	dtls_mtu_try("DTLS 1.2 with AES-128-CBC-HMAC-SHA1 - mtu:1503", "NORMAL:-VERS-ALL:+VERS-DTLS1.2:-CIPHER-ALL:+AES-128-CBC:-MAC-ALL:+SHA1", 1503, 1439);

	dtls_mtu_try("DTLS 1.2 with AES-128-CBC-HMAC-SHA1 - mtu:1504", "NORMAL:-VERS-ALL:+VERS-DTLS1.2:-CIPHER-ALL:+AES-128-CBC:-MAC-ALL:+SHA1", 1504, 1439);

	dtls_mtu_try("DTLS 1.2 with AES-128-CBC-HMAC-SHA1 - mtu:1505", "NORMAL:-VERS-ALL:+VERS-DTLS1.2:-CIPHER-ALL:+AES-128-CBC:-MAC-ALL:+SHA1", 1505, 1455);

	dtls_mtu_try("DTLS 1.2 with AES-128-CBC-HMAC-SHA1 - mtu:1506", "NORMAL:-VERS-ALL:+VERS-DTLS1.2:-CIPHER-ALL:+AES-128-CBC:-MAC-ALL:+SHA1", 1506, 1455);

	dtls_mtu_try("DTLS 1.2 with AES-128-CBC-HMAC-SHA1 - mtu:1507", "NORMAL:-VERS-ALL:+VERS-DTLS1.2:-CIPHER-ALL:+AES-128-CBC:-MAC-ALL:+SHA1", 1507, 1455);

	dtls_mtu_try("DTLS 1.2 with AES-128-CBC-HMAC-SHA1 - mtu:1508", "NORMAL:-VERS-ALL:+VERS-DTLS1.2:-CIPHER-ALL:+AES-128-CBC:-MAC-ALL:+SHA1", 1508, 1455);

	dtls_mtu_try("DTLS 1.2 with AES-128-CBC-HMAC-SHA1 - mtu:1509", "NORMAL:-VERS-ALL:+VERS-DTLS1.2:-CIPHER-ALL:+AES-128-CBC:-MAC-ALL:+SHA1", 1509, 1455);

	dtls_mtu_try("DTLS 1.2 with AES-128-CBC-HMAC-SHA1 - mtu:1510", "NORMAL:-VERS-ALL:+VERS-DTLS1.2:-CIPHER-ALL:+AES-128-CBC:-MAC-ALL:+SHA1", 1510, 1455);

	dtls_mtu_try("DTLS 1.2 with AES-128-CBC-HMAC-SHA1 - mtu:1511", "NORMAL:-VERS-ALL:+VERS-DTLS1.2:-CIPHER-ALL:+AES-128-CBC:-MAC-ALL:+SHA1", 1511, 1455);

	dtls_mtu_try("DTLS 1.2 with AES-128-CBC-HMAC-SHA1 - mtu:1512", "NORMAL:-VERS-ALL:+VERS-DTLS1.2:-CIPHER-ALL:+AES-128-CBC:-MAC-ALL:+SHA1", 1512, 1455);

	dtls_mtu_try("DTLS 1.2 with AES-128-CBC-HMAC-SHA1 - mtu:1513", "NORMAL:-VERS-ALL:+VERS-DTLS1.2:-CIPHER-ALL:+AES-128-CBC:-MAC-ALL:+SHA1", 1513, 1455);

	dtls_mtu_try("DTLS 1.2 with AES-128-CBC-HMAC-SHA1 - mtu:1514", "NORMAL:-VERS-ALL:+VERS-DTLS1.2:-CIPHER-ALL:+AES-128-CBC:-MAC-ALL:+SHA1", 1514, 1455);

	dtls_mtu_try("DTLS 1.2 with AES-128-CBC-HMAC-SHA1 - mtu:1515", "NORMAL:-VERS-ALL:+VERS-DTLS1.2:-CIPHER-ALL:+AES-128-CBC:-MAC-ALL:+SHA1", 1515, 1455);

	dtls_mtu_try("DTLS 1.2 with AES-128-CBC-HMAC-SHA1 - mtu:1516", "NORMAL:-VERS-ALL:+VERS-DTLS1.2:-CIPHER-ALL:+AES-128-CBC:-MAC-ALL:+SHA1", 1516, 1455);

	dtls_mtu_try("DTLS 1.2 with AES-128-CBC-HMAC-SHA1 - mtu:1517", "NORMAL:-VERS-ALL:+VERS-DTLS1.2:-CIPHER-ALL:+AES-128-CBC:-MAC-ALL:+SHA1", 1517, 1455);

	dtls_mtu_try("DTLS 1.2 with AES-128-CBC-HMAC-SHA1 - mtu:1518", "NORMAL:-VERS-ALL:+VERS-DTLS1.2:-CIPHER-ALL:+AES-128-CBC:-MAC-ALL:+SHA1", 1518, 1455);

	dtls_mtu_try("DTLS 1.2/EtM with AES-128-CBC-HMAC-SHA256", "NORMAL:-VERS-ALL:+VERS-DTLS1.2:-CIPHER-ALL:+AES-128-CBC:-MAC-ALL:+SHA256", 1500, 1423);

	dtls_mtu_try("DTLS 1.2/EtM with 3DES-CBC-HMAC-SHA1", "NORMAL:-VERS-ALL:+VERS-DTLS1.2:-CIPHER-ALL:+3DES-CBC:-MAC-ALL:+SHA1", 1500, 1455);

	gnutls_global_deinit();

}