/*

 * Copyright (C) 2017 Red Hat, Inc.

 *

 * Author: Thierry Quemerais, 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/>

 */

/* This program tests whether a cookie sent by the server is repeated

 * by the gnutls client. */

#ifdef HAVE_CONFIG_H

#include <config.h>

#endif

#include <stdio.h>

#include <stdlib.h>

#if defined(_WIN32)

/* socketpair isn't supported on Win32. */

int main(int argc, char **argv)

{

	exit(77);

}

#else

#include <string.h>

#include <sys/types.h>

#include <sys/socket.h>

#if !defined(_WIN32)

#include <sys/wait.h>

#include <signal.h>

#endif

#include <unistd.h>

#include <gnutls/gnutls.h>

#include <assert.h>

#include "utils.h"

#include "cert-common.h"

const char *side = "";

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

{

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

}

static int TLSEXT_TYPE_server_sent		= 0;

static int TLSEXT_TYPE_server_received		= 0;

static const unsigned char ext_data[] =

{

	0x00,

	0x03,

	0xFE,

	0xED,

	0xFF

};

static int ext_recv_server_cookie(gnutls_session_t session, const unsigned char *buf, size_t buflen)

{

	if (buflen != sizeof(ext_data))

		fail("ext_recv_server_params: Invalid input buffer length\n");

	if (memcmp(buf, ext_data, sizeof(ext_data)) != 0)

		fail("ext_recv_server_params: Invalid input buffer data\n");

	TLSEXT_TYPE_server_received = 1;

	return 0; //Success

}

static int ext_send_server_cookie(gnutls_session_t session, gnutls_buffer_t extdata)

{

	if (gnutls_ext_get_current_msg(session) == GNUTLS_EXT_FLAG_HRR) {

		TLSEXT_TYPE_server_sent = 1;

		gnutls_buffer_append_data(extdata, ext_data, sizeof(ext_data));

		return sizeof(ext_data);

	}

	return 0;

}

static void client(int sd)

{

	int ret;

	gnutls_session_t session;

	gnutls_certificate_credentials_t clientx509cred;

	global_init();

	gnutls_global_set_log_function(tls_log_func);

	if (debug)

		gnutls_global_set_log_level(4711);

	side = "client";

	gnutls_certificate_allocate_credentials(&clientx509cred);

	/* Initialize TLS session

	 */

	gnutls_init(&session, GNUTLS_CLIENT);

	/* Use default priorities */

	assert(gnutls_priority_set_direct(session, "NORMAL:-VERS-ALL:+VERS-TLS1.3",

				   NULL)>=0);

	/* put the anonymous credentials to the current session

	 */

	gnutls_credentials_set(session, GNUTLS_CRD_CERTIFICATE,

				clientx509cred);

	gnutls_transport_set_int(session, sd);

	gnutls_handshake_set_timeout(session, 20 * 1000);

	/* Perform the TLS handshake

	 */

	ret = gnutls_handshake(session);

	if (ret < 0) {

		fail("client: Handshake failed: %s\n", gnutls_strerror(ret));

		goto end;

	} else {

		if (debug)

			success("client: Handshake was completed\n");

	}

	gnutls_bye(session, GNUTLS_SHUT_WR);

end:

	close(sd);

	gnutls_deinit(session);

	gnutls_certificate_free_credentials(clientx509cred);

	gnutls_global_deinit();

}

static void server(int sd)

{

	gnutls_certificate_credentials_t serverx509cred;

	int ret;

	gnutls_session_t session;

	/* this must be called once in the program

	 */

	global_init();

	gnutls_global_set_log_function(tls_log_func);

	if (debug)

		gnutls_global_set_log_level(4711);

	side = "server";

	gnutls_certificate_allocate_credentials(&serverx509cred);

	gnutls_certificate_set_x509_key_mem(serverx509cred,

					    &server_cert, &server_key,

					    GNUTLS_X509_FMT_PEM);

	gnutls_init(&session, GNUTLS_SERVER);

	/* force a hello retry request by disabling all the groups that are

	 * enabled by default. */

	assert(gnutls_priority_set_direct(session,

					  "NORMAL:-VERS-ALL:+VERS-TLS1.3:"

					  "-GROUP-SECP256R1:-GROUP-X25519:-GROUP-FFDHE2048",

					  NULL)>=0);

	gnutls_credentials_set(session, GNUTLS_CRD_CERTIFICATE,

				serverx509cred);

	ret = gnutls_session_ext_register(session, "cookie_server", 44, GNUTLS_EXT_TLS, ext_recv_server_cookie, ext_send_server_cookie,

					  NULL, NULL, NULL,

					  GNUTLS_EXT_FLAG_CLIENT_HELLO|GNUTLS_EXT_FLAG_HRR|GNUTLS_EXT_FLAG_OVERRIDE_INTERNAL|GNUTLS_EXT_FLAG_IGNORE_CLIENT_REQUEST);

	if (ret != 0)

		fail("server: cannot register: %s", gnutls_strerror(ret));

	gnutls_transport_set_int(session, sd);

	gnutls_handshake_set_timeout(session, 20 * 1000);

	ret = gnutls_handshake(session);

	if (ret < 0) {

		fail("server: Handshake has failed: %s\n\n",

		     gnutls_strerror(ret));

		goto end;

	}

	if (debug)

		success("server: Handshake was completed\n");

	if (TLSEXT_TYPE_server_sent != 1)

		fail("server: extension not properly sent\n");

	if (TLSEXT_TYPE_server_received != 1)

		fail("server: extension not properly received\n");

	/* do not wait for the peer to close the connection.

	 */

	gnutls_bye(session, GNUTLS_SHUT_WR);

end:

	close(sd);

	gnutls_deinit(session);

	gnutls_certificate_free_credentials(serverx509cred);

	gnutls_global_deinit();

	if (debug)

		success("server: finished\n");

}

void doit(void)

{

	pid_t child;

	int sockets[2];

	int err;

	signal(SIGPIPE, SIG_IGN);

	err = socketpair(AF_UNIX, SOCK_STREAM, 0, sockets);

	if (err == -1) {

		perror("socketpair");

		fail("socketpair failed\n");

		return;

	}

	TLSEXT_TYPE_server_sent	= 0;

	TLSEXT_TYPE_server_received = 0;

	child = fork();

	if (child < 0) {

		perror("fork");

		fail("fork");

		return;

	}

	if (child) {

		int status = 0;

		/* parent */

		close(sockets[1]);

		server(sockets[0]);

		wait(&status);

	} else {

		close(sockets[0]);

		client(sockets[1]);

		exit(0);

	}

}

#endif				/* _WIN32 */