/*

 * Copyright (C) 2015 Nikos Mavrogiannopoulos

 *

 * 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 "cert-common.h"

/* This test checks whether an invalid extensions field will lead

 * to a GNUTLS_E_UNEXPECTED_EXTENSIONS_LENGTH. */

#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 <signal.h>

#include <gnutls/gnutls.h>

#include "utils.h"

static void terminate(void);

static unsigned reduce = 0;

/* This program tests the client hello verify in DTLS

 */

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);

}

#define RECORD_PAYLOAD_POS 5

#define HANDSHAKE_CS_POS (39)

static ssize_t odd_push(gnutls_transport_ptr_t tr, const void *data, size_t len)

{

	uint8_t *d = (void*)data;

	int fd = (long)tr;

	uint16_t csize, osize;

	int pos;

	if (d[0] == 22 && d[5] == GNUTLS_HANDSHAKE_CLIENT_HELLO) {

		/* skip ciphersuites */

		csize = d[RECORD_PAYLOAD_POS+HANDSHAKE_CS_POS+1] + (d[RECORD_PAYLOAD_POS+HANDSHAKE_CS_POS] << 8);

		csize += 2;

		/* skip compression methods */

		osize = d[RECORD_PAYLOAD_POS+HANDSHAKE_CS_POS+csize];

		osize += 1;

		pos = RECORD_PAYLOAD_POS+HANDSHAKE_CS_POS+csize+osize;

		if (reduce) {

			if (d[pos+1] != 0x00) {

				d[pos+1] = d[pos+1] - 1;

			} else {

				d[pos] = d[pos] - 1;

				d[pos+1] = 0xff;

			}

		} else {

			if (d[pos+1] != 0xff) {

				d[pos+1] = d[pos+1] + 1;

			} else {

				d[pos] = d[pos] + 1;

				d[pos+1] = 0x00;

			}

		}

	}

	return send(fd, data, len, 0);

}

/* A very basic DTLS client handling DTLS 0.9 which sets premaster secret.

 */

static void client(int fd)

{

	int ret;

	gnutls_certificate_credentials_t xcred;

	gnutls_session_t session;

	global_init();

	if (debug) {

		gnutls_global_set_log_function(client_log_func);

		gnutls_global_set_log_level(4711);

	}

	gnutls_certificate_allocate_credentials(&xcred);

	/* Initialize TLS session

	 */

	gnutls_init(&session, GNUTLS_CLIENT);

	gnutls_handshake_set_timeout(session, 20 * 1000);

	/* Use default priorities */

	gnutls_priority_set_direct(session,

				   "NORMAL:-KX-ALL:+ECDHE-RSA:%COMPAT",

				   NULL);

	gnutls_credentials_set(session, GNUTLS_CRD_CERTIFICATE, xcred);

	gnutls_transport_set_int(session, fd);

	gnutls_transport_set_push_function(session, odd_push);

	/* Perform the TLS handshake

	 */

	do {

		ret = gnutls_handshake(session);

	}

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

	if (ret >= 0) {

		fail("client: Handshake succeeded!\n");

		exit(1);

	}

	close(fd);

	gnutls_deinit(session);

	gnutls_certificate_free_credentials(xcred);

	gnutls_global_deinit();

}

/* These are global */

pid_t child;

static void terminate(void)

{

	int status;

	kill(child, SIGTERM);

	wait(&status);

	exit(1);

}

static void server(int fd)

{

	int ret;

	gnutls_certificate_credentials_t xcred;

	gnutls_session_t session;

	/* this must be called once in the program

	 */

	global_init();

	if (debug) {

		gnutls_global_set_log_function(server_log_func);

		gnutls_global_set_log_level(4711);

	}

	gnutls_certificate_allocate_credentials(&xcred);

	ret = gnutls_certificate_set_x509_key_mem(xcred,

					    &server_cert, &server_key,

					    GNUTLS_X509_FMT_PEM);

	if (ret < 0)

		exit(1);

	gnutls_init(&session, GNUTLS_SERVER);

	gnutls_handshake_set_timeout(session, 20 * 1000);

	/* avoid calling all the priority functions, since the defaults

	 * are adequate.

	 */

	gnutls_priority_set_direct(session,

				   "NORMAL:-KX-ALL:+ECDHE-RSA",

				   NULL);

	gnutls_credentials_set(session, GNUTLS_CRD_CERTIFICATE, xcred);

	gnutls_transport_set_int(session, fd);

	do {

		ret = gnutls_handshake(session);

	}

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

	if (ret != GNUTLS_E_UNEXPECTED_EXTENSIONS_LENGTH) {

		close(fd);

		gnutls_deinit(session);

		fail("server: Handshake did not fail with GNUTLS_E_UNEXPECTED_EXTENSIONS_LENGTH (%s)\n\n",

		     gnutls_strerror(ret));

		terminate();

	}

	success("server: Handshake failed as expected\n");

	close(fd);

	gnutls_deinit(session);

	gnutls_certificate_free_credentials(xcred);

	gnutls_global_deinit();

	if (debug)

		success("server: finished\n");

}

static void start(void)

{

	int fd[2];

	int ret;

	signal(SIGPIPE, SIG_IGN);

	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) {

		int status;

		/* parent */

		close(fd[0]);

		server(fd[1]);

		wait(&status);

		check_wait_status(status);

		close(fd[1]);

	} else {

		close(fd[1]);

		client(fd[0]);

		exit(0);

	}

}

void doit(void)

{

	/* check overflow */

	start();

	/* check underflow */

	reduce = 1;

	start();

}

#endif				/* _WIN32 */