/*

 * Copyright (C) 2017-2020 Red Hat, Inc.

 *

 * Author: Nikos Mavrogiannopoulos, Daiki Ueno

 *

 * 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>

#if defined(_WIN32)

int main()

{

	exit(77);

}

#else

#include <string.h>

#include <sys/types.h>

#include <netinet/in.h>

#include <sys/socket.h>

#include <sys/wait.h>

#include <arpa/inet.h>

#include <unistd.h>

#include <gnutls/gnutls.h>

#include <signal.h>

#include <assert.h>

#include "../lib/handshake-defs.h"

#include "cert-common.h"

#include "utils.h"

/* This program tests whether the certificate seen in Post Handshake Auth

 * is found in a resumed session under TLS 1.3.

 */

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

{

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

}

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

{

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

}

static unsigned tickets_seen = 0;

static int ticket_callback(gnutls_session_t session, unsigned int htype,

			   unsigned post, unsigned int incoming, const gnutls_datum_t *msg)

{

	gnutls_datum *d;

	int ret;

	assert(htype == GNUTLS_HANDSHAKE_NEW_SESSION_TICKET);

	d = gnutls_session_get_ptr(session);

	if (post == GNUTLS_HOOK_POST) {

		tickets_seen++;

		if (d->data)

			gnutls_free(d->data);

		ret = gnutls_session_get_data2(session, d);

		assert(ret >= 0);

		assert(d->size > 4);

		return 0;

	}

	return 0;

}

static void client(int fd, unsigned flags, unsigned tickets)

{

	int ret;

	gnutls_session_t session;

	unsigned try = 0;

	gnutls_datum_t session_data = {NULL, 0};

	gnutls_certificate_credentials_t x509_cred;

	global_init();

	tickets_seen = 0;

	if (debug) {

		gnutls_global_set_log_function(client_log_func);

		gnutls_global_set_log_level(7);

	}

	assert(gnutls_certificate_allocate_credentials(&x509_cred)>=0);

 retry:

	/* Initialize TLS session

	 */

	assert(gnutls_init(&session, GNUTLS_CLIENT|flags)>=0);

	gnutls_handshake_set_timeout(session, 20 * 1000);

	ret = gnutls_priority_set_direct(session, "NORMAL:-VERS-ALL:+VERS-TLS1.3:+VERS-TLS1.2:+VERS-TLS1.0", NULL);

	if (ret < 0)

		fail("cannot set TLS 1.3 priorities\n");

	if (try == 0) {

		gnutls_session_set_ptr(session, &session_data);

		gnutls_handshake_set_hook_function(session, GNUTLS_HANDSHAKE_NEW_SESSION_TICKET,

						   GNUTLS_HOOK_BOTH,

						   ticket_callback);

	} else {

		assert(gnutls_session_set_data(session, session_data.data, session_data.size) >= 0);

	}

	gnutls_credentials_set(session, GNUTLS_CRD_CERTIFICATE, x509_cred);

	gnutls_transport_set_int(session, fd);

	/* Perform the TLS handshake

	 */

	do {

		ret = gnutls_handshake(session);

	}

	while (ret < 0 && gnutls_error_is_fatal(ret) == 0);

	if (ret != 0)

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

	do {

		ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);

	} while(ret == GNUTLS_E_AGAIN || ret == GNUTLS_E_INTERRUPTED);

	if (ret != 0) {

		fail("error in recv: %s\n", gnutls_strerror(ret));

	}

	if (tickets_seen != tickets)

		fail("unexpected number of tickets received: %u != %u",

		     tickets_seen, tickets);

	gnutls_deinit(session);

	if (tickets > 0 && try == 0) {

		try++;

		goto retry;

	}

	close(fd);

	gnutls_free(session_data.data);

	gnutls_global_deinit();

}

static void server(int fd, unsigned flags,

		   unsigned tickets_sent, unsigned tickets_expected)

{

	int ret;

	gnutls_session_t session;

	gnutls_certificate_credentials_t x509_cred;

	gnutls_datum_t skey;

	/* this must be called once in the program

	 */

	global_init();

	assert(gnutls_session_ticket_key_generate(&skey)>=0);

	if (debug) {

		gnutls_global_set_log_function(server_log_func);

		gnutls_global_set_log_level(4711);

	}

	gnutls_certificate_allocate_credentials(&x509_cred);

	gnutls_certificate_set_x509_key_mem(x509_cred, &server_cert,

					    &server_key,

					    GNUTLS_X509_FMT_PEM);

	assert(gnutls_init(&session, GNUTLS_SERVER|flags)>=0);

	assert(gnutls_session_ticket_enable_server(session, &skey) >= 0);

	gnutls_handshake_set_timeout(session, 20 * 1000);

	assert(gnutls_priority_set_direct(session, "NORMAL:+VERS-TLS1.3", NULL)>=0);

	gnutls_credentials_set(session, GNUTLS_CRD_CERTIFICATE, x509_cred);

	gnutls_transport_set_int(session, fd);

	do {

		ret = gnutls_handshake(session);

	} while (ret < 0 && gnutls_error_is_fatal(ret) == 0);

	if (ret != 0)

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

	if (tickets_sent > 0) {

		do {

			ret = gnutls_session_ticket_send(session, tickets_sent, 0);

		} while (ret == GNUTLS_E_AGAIN || ret == GNUTLS_E_INTERRUPTED);

	}

	do {

		ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);

	} while(ret == GNUTLS_E_AGAIN || ret == GNUTLS_E_INTERRUPTED);

	gnutls_deinit(session);

	if (tickets_expected > 0) {

		/* resume session

		 */

		assert(gnutls_init(&session, GNUTLS_SERVER|flags)>=0);

		assert(gnutls_session_ticket_enable_server(session, &skey) >= 0);

		gnutls_handshake_set_timeout(session, 20 * 1000);

		assert(gnutls_priority_set_direct(session, "NORMAL:+VERS-TLS1.3", NULL)>=0);

		gnutls_credentials_set(session, GNUTLS_CRD_CERTIFICATE, x509_cred);

		gnutls_transport_set_int(session, fd);

		do {

			ret = gnutls_handshake(session);

		} while (ret < 0 && gnutls_error_is_fatal(ret) == 0);

		if (ret != 0)

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

		assert(gnutls_session_is_resumed(session) != 0);

		gnutls_bye(session, GNUTLS_SHUT_RDWR);

		gnutls_deinit(session);

	}

	gnutls_free(skey.data);

	close(fd);

	gnutls_certificate_free_credentials(x509_cred);

	gnutls_global_deinit();

	if (debug)

		success("server: client/server hello were verified\n");

}

static void ch_handler(int sig)

{

	int status = 0;

	wait(&status);

	check_wait_status(status);

	return;

}

static void start(const char *name,

		  unsigned flags,

		  unsigned tickets_sent,

		  unsigned tickets_expected)

{

	int fd[2];

	int ret;

	pid_t child;

	success("testing: %s\n", name);

	ret = socketpair(AF_UNIX, SOCK_STREAM, 0, fd);

	if (ret < 0) {

		perror("socketpair");

		exit(1);

	}

	child = fork();

	if (child < 0) {

		perror("fork");

		fail("fork");

		exit(1);

	}

	if (child) {

		/* parent */

		close(fd[1]);

		server(fd[0], flags, tickets_sent, tickets_expected);

		kill(child, SIGTERM);

	} else {

		close(fd[0]);

		client(fd[1], flags, tickets_expected);

		exit(0);

	}

}

void doit(void)

{

	signal(SIGCHLD, ch_handler);

	signal(SIGPIPE, SIG_IGN);

	start("auto send ticket 0", 0, 0, TLS13_TICKETS_TO_SEND);

	start("auto send ticket 1", 0, 1, TLS13_TICKETS_TO_SEND + 1);

	start("no auto send ticket 0", GNUTLS_NO_AUTO_SEND_TICKET, 0, 0);

	start("no auto send ticket 1", GNUTLS_NO_AUTO_SEND_TICKET, 1, 1);

}

#endif				/* _WIN32 */