/*

 * 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

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#include <errno.h>

#include <gnutls/gnutls.h>

#include "utils.h"

#include "eagain-common.h"

/* This test checks whether the server switching certificates is detected

 * by the client */

const char *side;

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

{

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

}

#include "cert-common.h"

static int

pskfunc(gnutls_session_t session, const char *username,

	gnutls_datum_t * key)

{

	if (debug)

		printf("psk: username %s\n", username);

	key->data = gnutls_malloc(4);

	key->data[0] = 0xDE;

	key->data[1] = 0xAD;

	key->data[2] = 0xBE;

	key->data[3] = 0xEF;

	key->size = 4;

	return 0;

}

static void try(const char *prio, gnutls_kx_algorithm_t kx, unsigned allow_change)

{

	int ret;

	/* Server stuff. */

	gnutls_psk_server_credentials_t serverpskcred;

	gnutls_dh_params_t dh_params;

	const gnutls_datum_t p3 =

	    { (unsigned char *) pkcs3, strlen(pkcs3) };

	gnutls_session_t server;

	int sret = GNUTLS_E_AGAIN;

	/* Client stuff. */

	gnutls_psk_client_credentials_t clientpskcred;

	gnutls_psk_client_credentials_t clientpskcred2;

	gnutls_session_t client;

	const gnutls_datum_t key = { (void *) "DEADBEEF", 8 };

	int cret = GNUTLS_E_AGAIN;

	/* General init. */

	gnutls_global_set_log_function(tls_log_func);

	if (debug)

		gnutls_global_set_log_level(6);

	/* Init server */

	gnutls_psk_allocate_server_credentials(&serverpskcred);

	gnutls_psk_set_server_credentials_function(serverpskcred,

						   pskfunc);

	gnutls_dh_params_init(&dh_params);

	gnutls_dh_params_import_pkcs3(dh_params, &p3, GNUTLS_X509_FMT_PEM);

	gnutls_psk_set_server_dh_params(serverpskcred, dh_params);

	if (allow_change)

		gnutls_init(&server, GNUTLS_SERVER|GNUTLS_ALLOW_ID_CHANGE);

	else

		gnutls_init(&server, GNUTLS_SERVER);

	gnutls_credentials_set(server, GNUTLS_CRD_PSK,

				serverpskcred);

	gnutls_priority_set_direct(server,

				   prio,

				   NULL);

	gnutls_transport_set_push_function(server, server_push);

	gnutls_transport_set_pull_function(server, server_pull);

	gnutls_transport_set_ptr(server, server);

	/* Init client */

	ret = gnutls_psk_allocate_client_credentials(&clientpskcred);

	if (ret < 0)

		exit(1);

	gnutls_psk_set_client_credentials(clientpskcred, "test1", &key,

					  GNUTLS_PSK_KEY_HEX);

	ret = gnutls_psk_allocate_client_credentials(&clientpskcred2);

	if (ret < 0)

		exit(1);

	gnutls_psk_set_client_credentials(clientpskcred2, "test2", &key,

					  GNUTLS_PSK_KEY_HEX);

	ret = gnutls_init(&client, GNUTLS_CLIENT);

	if (ret < 0)

		exit(1);

	ret = gnutls_credentials_set(client, GNUTLS_CRD_PSK,

				clientpskcred);

	if (ret < 0)

		exit(1);

	ret = gnutls_priority_set_direct(client, prio, NULL);

	if (ret < 0)

		exit(1);

	gnutls_transport_set_push_function(client, client_push);

	gnutls_transport_set_pull_function(client, client_pull);

	gnutls_transport_set_ptr(client, client);

	HANDSHAKE(client, server);

	if (gnutls_kx_get(client) != kx) {

		fail("got unexpected key exchange algorithm: %s (expected %s)\n",

			gnutls_kx_get_name(gnutls_kx_get(client)),

			gnutls_kx_get_name(kx));

		exit(1);

	}

	/* switch client's username and rehandshake */

	ret = gnutls_credentials_set(client, GNUTLS_CRD_PSK,

				clientpskcred2);

	if (ret < 0)

		exit(1);

	if (allow_change) {

		HANDSHAKE(client, server);

	} else {

		HANDSHAKE_EXPECT(client, server, GNUTLS_E_AGAIN, GNUTLS_E_SESSION_USER_ID_CHANGED);

	}

	gnutls_deinit(client);

	gnutls_deinit(server);

	gnutls_psk_free_server_credentials(serverpskcred);

	gnutls_psk_free_client_credentials(clientpskcred);

	gnutls_psk_free_client_credentials(clientpskcred2);

	gnutls_dh_params_deinit(dh_params);

}

void doit(void)

{

	global_init();

	/* Allow change of ID */

	try("NORMAL:-VERS-ALL:+VERS-TLS1.2:-KX-ALL:+PSK", GNUTLS_KX_PSK, 0);

	reset_buffers();

	try("NORMAL:-VERS-ALL:+VERS-TLS1.2:-KX-ALL:+DHE-PSK", GNUTLS_KX_DHE_PSK, 0);

	reset_buffers();

	try("NORMAL:-VERS-ALL:+VERS-TLS1.2:-KX-ALL:+ECDHE-PSK", GNUTLS_KX_ECDHE_PSK, 0);

	reset_buffers();

	/* Prohibit (default) change of ID */

	try("NORMAL:-VERS-ALL:+VERS-TLS1.2:-KX-ALL:+PSK", GNUTLS_KX_PSK, 1);

	reset_buffers();

	try("NORMAL:-VERS-ALL:+VERS-TLS1.2:-KX-ALL:+DHE-PSK", GNUTLS_KX_DHE_PSK, 1);

	reset_buffers();

	try("NORMAL:-VERS-ALL:+VERS-TLS1.2:-KX-ALL:+ECDHE-PSK", GNUTLS_KX_ECDHE_PSK, 1);

	reset_buffers();

	gnutls_global_deinit();

}