/*

 * Copyright (C) 2017-2020 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 Lesser General Public License

 * along with this program.  If not, see <https://www.gnu.org/licenses/>

 */

/* This program tests whether the second DTLS client hello contains the same

 * random value, and whether it is initialized.

 */

#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 unsigned cb_called = 0;

static int hello_callback(gnutls_session_t session, unsigned int htype,

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

{

	unsigned non_zero = 0, i;

	if (htype == GNUTLS_HANDSHAKE_CLIENT_HELLO && post == GNUTLS_HOOK_POST) {

		if (cb_called == 0) {

			unsigned char crandom[32];

			gnutls_datum_t tmp;

			gnutls_session_get_random(session, &tmp, NULL);

			assert(tmp.size == 32);

			memcpy(crandom, tmp.data, tmp.size);

			cb_called++;

			/* check if uninitialized */

			for (i=0;i<32;i++) {

				if (crandom[i] != 0) {

					non_zero++;

				}

			}

			if (non_zero <= 8) {

				fail("the client random value seems uninitialized\n");

			}

		} else {

			cb_called++;

		}

	} else if (htype == GNUTLS_HANDSHAKE_SERVER_HELLO && post == GNUTLS_HOOK_POST) {

		unsigned char crandom[32];

		gnutls_datum_t tmp;

		gnutls_session_get_random(session, NULL, &tmp);

		assert(tmp.size == 32);

		memcpy(crandom, tmp.data, tmp.size);

		/* check if uninitialized */

		for (i=0;i<32;i++) {

			if (crandom[i] != 0) {

				non_zero++;

			}

		}

		if (non_zero <= 8) {

			fail("the server random value seems uninitialized\n");

		}

	}

	return 0;

}

static void client(int sd, const char *priority)

{

	int ret;

	gnutls_session_t session;

	gnutls_certificate_credentials_t clientx509cred;

	gnutls_global_set_log_function(tls_log_func);

	if (debug)

		gnutls_global_set_log_level(4711);

	side = "client";

	gnutls_certificate_allocate_credentials(&clientx509cred);

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

	if (!priority) {

		assert(gnutls_set_default_priority(session) >= 0);

	} else {

		assert(gnutls_priority_set_direct(session, priority, NULL) >= 0);

	}

	gnutls_credentials_set(session, GNUTLS_CRD_CERTIFICATE,

				clientx509cred);

	gnutls_transport_set_int(session, sd);

	gnutls_handshake_set_timeout(session, 20 * 1000);

	gnutls_handshake_set_hook_function(session, GNUTLS_HANDSHAKE_ANY,

					   GNUTLS_HOOK_BOTH, hello_callback);

	ret = gnutls_handshake(session);

	if (ret < 0) {

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

	} else {

		if (debug)

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

	}

	if (cb_called != 1) {

		fail("client: the callback was not seen (%d)!\n", cb_called);

	}

	gnutls_bye(session, GNUTLS_SHUT_WR);

	close(sd);

	gnutls_deinit(session);

	gnutls_certificate_free_credentials(clientx509cred);

}

static void server(int sd, const char *priority)

{

	int ret;

	gnutls_certificate_credentials_t serverx509cred;

	gnutls_session_t session;

	gnutls_global_set_log_function(tls_log_func);

	if (debug)

		gnutls_global_set_log_level(4711);

	side = "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(&session, GNUTLS_SERVER)>=0);

	assert(session != NULL);

	if (!priority) {

		assert(gnutls_set_default_priority(session) >= 0);

	} else {

		assert(gnutls_priority_set_direct(session, priority, NULL) >= 0);

	}

	gnutls_credentials_set(session, GNUTLS_CRD_CERTIFICATE,

				serverx509cred);

	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));

	}

	if (debug)

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

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

	 */

	gnutls_bye(session, GNUTLS_SHUT_WR);

	close(sd);

	gnutls_deinit(session);

	gnutls_certificate_free_credentials(serverx509cred);

	if (debug)

		success("server: finished\n");

}

static void start(const char *name, const char *priority)

{

	pid_t child;

	int sockets[2];

	int err;

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

	cb_called = 0;

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

	if (err == -1) {

		perror("socketpair");

		fail("socketpair failed\n");

		return;

	}

	child = fork();

	if (child < 0) {

		perror("fork");

		fail("fork");

		return;

	}

	if (child) {

		int status = 0;

		/* parent */

		close(sockets[1]);

		client(sockets[0], priority);

		wait(&status);

		check_wait_status(status);

	} else {

		close(sockets[0]);

		server(sockets[1], priority);

		exit(0);

	}

}

void doit(void)

{

	signal(SIGPIPE, SIG_IGN);

	start("default", NULL);

	start("tls1.3", "NORMAL:-VERS-ALL:+VERS-TLS1.3");

	start("tls1.2", "NORMAL:-VERS-ALL:+VERS-TLS1.2");

	start("tls1.1", "NORMAL:-VERS-ALL:+VERS-TLS1.1");

	start("tls1.0", "NORMAL:-VERS-ALL:+VERS-TLS1.0");

}

#endif				/* _WIN32 */