/*
 * Copyright (C) 2015 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 client switching certificates is detected
 * by the server */

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 void try(void)
{
	int ret;
	/* Server stuff. */
	gnutls_certificate_credentials_t serverx509cred;
	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_certificate_credentials_t clientx509cred;
	gnutls_certificate_credentials_t clientx509cred2;
	gnutls_session_t client;
	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_certificate_allocate_credentials(&serverx509cred);
	gnutls_certificate_set_x509_key_mem(serverx509cred,
					    &server_cert, &server_key,
					    GNUTLS_X509_FMT_PEM);

	gnutls_dh_params_init(&dh_params);
	gnutls_dh_params_import_pkcs3(dh_params, &p3, GNUTLS_X509_FMT_PEM);
	gnutls_certificate_set_dh_params(serverx509cred, dh_params);

	gnutls_init(&server, GNUTLS_SERVER);
	gnutls_certificate_server_set_request(server, GNUTLS_CERT_REQUEST);
	gnutls_credentials_set(server, GNUTLS_CRD_CERTIFICATE,
				serverx509cred);

	gnutls_priority_set_direct(server,
				   "NORMAL:-VERS-ALL:+VERS-TLS1.2",
				   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_certificate_allocate_credentials(&clientx509cred);
	if (ret < 0)
		exit(1);

	ret = gnutls_certificate_set_x509_key_mem(clientx509cred, &cli_cert, &cli_key, GNUTLS_X509_FMT_PEM);
	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_certificate_allocate_credentials(&clientx509cred2);
	if (ret < 0)
		exit(1);

	ret = gnutls_certificate_set_x509_key_mem(clientx509cred2, &server2_cert, &server2_key, GNUTLS_X509_FMT_PEM);
	if (ret < 0)
		exit(1);

	ret = gnutls_certificate_set_x509_trust_mem(clientx509cred2, &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);

	ret = gnutls_priority_set_direct(client, "NORMAL:-VERS-ALL:+VERS-TLS1.2:-KX-ALL:+RSA", 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) != GNUTLS_KX_RSA) {
		fail("got unexpected key exchange algorithm: %s (expected RSA)\n", gnutls_kx_get_name(gnutls_kx_get(client)));
		exit(1);
	}

	/* switch server's certificate and rehandshake */
	gnutls_credentials_set(client, GNUTLS_CRD_CERTIFICATE,
				clientx509cred2);

	HANDSHAKE_EXPECT(client, server, GNUTLS_E_AGAIN, GNUTLS_E_SESSION_USER_ID_CHANGED);

	gnutls_deinit(client);
	gnutls_deinit(server);

	gnutls_certificate_free_credentials(serverx509cred);
	gnutls_certificate_free_credentials(clientx509cred);
	gnutls_certificate_free_credentials(clientx509cred2);
	gnutls_dh_params_deinit(dh_params);
}

void doit(void)
{
	global_init();

	try();
	gnutls_global_deinit();
}
