/*

 * Copyright (C) 2004-2012 Free Software Foundation, Inc.

 * Copyright (C) 2013 Adam Sampson <ats@offog.org>

 * Copyright (C) 2018 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/>

 */

#ifdef HAVE_CONFIG_H

#include <config.h>

#endif

#include <stdio.h>

#include <stdlib.h>

#include <stdint.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>

#endif

#include <unistd.h>

#include <gnutls/gnutls.h>

#include <assert.h>

#include <signal.h>

#include "tls13/ext-parse.h"

#include "utils.h"

/* Tests whether the pre-shared key extension will always be last

 * even if the dumbfw extension is present.

 */

const char *side = "";

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

{

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

}

#define MAX_BUF 1024

#define MSG "Hello TLS"

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

{

	int ret, ii;

	gnutls_session_t session;

	char buffer[MAX_BUF + 1];

	gnutls_psk_client_credentials_t pskcred;

	/* Need to enable anonymous KX specifically. */

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

	global_init();

	gnutls_global_set_log_function(tls_log_func);

	if (debug)

		gnutls_global_set_log_level(6);

	side = "client";

	gnutls_psk_allocate_client_credentials(&pskcred);

	gnutls_psk_set_client_credentials(pskcred, "test", &key,

					  GNUTLS_PSK_KEY_HEX);

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

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

	assert(gnutls_credentials_set(session, GNUTLS_CRD_PSK, pskcred)>=0);

	gnutls_transport_set_int(session, sd);

	/* Perform the TLS handshake

	 */

	ret = gnutls_handshake(session);

	if (ret < 0) {

		fail("client: Handshake failed\n");

		gnutls_perror(ret);

		goto end;

	} else {

		if (debug)

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

	}

	assert(gnutls_record_send(session, MSG, strlen(MSG))>=0);

	ret = gnutls_record_recv(session, buffer, MAX_BUF);

	if (ret == 0) {

		if (debug)

			success

			    ("client: Peer has closed the TLS connection\n");

		goto end;

	} else if (ret < 0) {

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

		goto end;

	}

	if (debug) {

		printf("- Received %d bytes: ", ret);

		for (ii = 0; ii < ret; ii++) {

			fputc(buffer[ii], stdout);

		}

		fputs("\n", stdout);

	}

	gnutls_bye(session, GNUTLS_SHUT_RDWR);

      end:

	close(sd);

	gnutls_deinit(session);

	gnutls_psk_free_client_credentials(pskcred);

	gnutls_global_deinit();

}

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;

}

#define EXT_CLIENTHELLO_PADDING 21

#define EXT_PRE_SHARED_KEY 41

struct ctx_st {

	unsigned long pos;

	void *base;

};

static

void check_ext_pos(void *priv, gnutls_datum_t *msg)

{

	struct ctx_st *ctx = priv;

	ctx->pos = (ptrdiff_t)((ptrdiff_t)msg->data - (ptrdiff_t)ctx->base);

}

static int client_hello_callback(gnutls_session_t session, unsigned int htype,

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

{

	unsigned long pos_psk;

	unsigned long pos_pad;

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

		struct ctx_st ctx;

		ctx.base = msg->data;

		if (find_client_extension(msg, EXT_CLIENTHELLO_PADDING, &ctx, check_ext_pos) == 0)

			fail("Could not find dumbfw/client hello padding extension!\n");

		pos_pad = ctx.pos;

		ctx.base = msg->data;

		if (find_client_extension(msg, EXT_PRE_SHARED_KEY, &ctx, check_ext_pos) == 0)

			fail("Could not find psk extension!\n");

		pos_psk = ctx.pos;

		if (pos_psk < pos_pad) {

			fail("The dumbfw extension was sent after pre-shared key!\n");

		}

		/* check if we are the last extension in general */

		if (!is_client_extension_last(msg, EXT_PRE_SHARED_KEY)) {

			fail("pre-shared key extension wasn't the last one!\n");

		}

	}

	return 0;

}

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

{

	gnutls_psk_server_credentials_t server_pskcred;

	int ret;

	gnutls_session_t session;

	char buffer[MAX_BUF + 1];

	global_init();

	gnutls_global_set_log_function(tls_log_func);

	if (debug)

		gnutls_global_set_log_level(6);

	side = "server";

	assert(gnutls_psk_allocate_server_credentials(&server_pskcred)>=0);

	gnutls_psk_set_server_credentials_function(server_pskcred,

						   pskfunc);

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

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

	gnutls_credentials_set(session, GNUTLS_CRD_PSK, server_pskcred);

	gnutls_handshake_set_hook_function(session, GNUTLS_HANDSHAKE_ANY,

					   GNUTLS_HOOK_BOTH,

					   client_hello_callback);

	gnutls_transport_set_int(session, sd);

	ret = gnutls_handshake(session);

	if (ret < 0) {

		close(sd);

		gnutls_deinit(session);

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

		     gnutls_strerror(ret));

		return;

	}

	if (debug)

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

	for (;;) {

		memset(buffer, 0, MAX_BUF + 1);

		gnutls_record_set_timeout(session, 10000);

		ret = gnutls_record_recv(session, buffer, MAX_BUF);

		if (ret == 0) {

			if (debug)

				success

				    ("server: Peer has closed the GnuTLS connection\n");

			break;

		} else if (ret < 0) {

			fail("server: Received corrupted data(%d). Closing...\n", ret);

			break;

		} else if (ret > 0) {

			/* echo data back to the client

			 */

			gnutls_record_send(session, buffer,

					   strlen(buffer));

		}

	}

	gnutls_bye(session, GNUTLS_SHUT_WR);

	close(sd);

	gnutls_deinit(session);

	gnutls_psk_free_server_credentials(server_pskcred);

	gnutls_global_deinit();

	if (debug)

		success("server: finished\n");

}

static void ch_handler(int sig)

{

	int status = 0;

	wait(&status);

	check_wait_status(status);

	return;

}

static

void run_test(const char *prio)

{

	pid_t child;

	int err;

	int sockets[2];

	signal(SIGCHLD, ch_handler);

	signal(SIGPIPE, SIG_IGN);

	success("trying with %s\n", prio);

	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]);

		server(sockets[0], prio);

		wait(&status);

		check_wait_status(status);

	} else {

		close(sockets[0]);

		client(sockets[1], prio);

		exit(0);

	}

}

void doit(void)

{

	run_test("NORMAL:-VERS-ALL:+VERS-TLS1.3:+VERS-TLS1.2:+PSK:%DUMBFW:-GROUP-ALL:+GROUP-FFDHE2048");

}

#endif				/* _WIN32 */