/*

 * Copyright (C) 2004-2016 Free Software Foundation, 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 an extension is exchanged when registered

 * at the session level */

#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);

}

#define TLSEXT_TYPE_SAMPLE 0xF1

#define TLSEXT_TYPE_IGN 0xF2

static int TLSEXT_TYPE_client_sent		= 0;

static int TLSEXT_TYPE_client_received		= 0;

static int TLSEXT_TYPE_server_sent		= 0;

static int TLSEXT_TYPE_server_received		= 0;

static int ign_extension_called = 0;

static void reset_vars(void)

{

	TLSEXT_TYPE_client_sent = 0;

	TLSEXT_TYPE_client_received = 0;

	TLSEXT_TYPE_server_sent = 0;

	TLSEXT_TYPE_server_received = 0;

	ign_extension_called = 0;

}

static const unsigned char ext_data[] =

{	

	0xFE,

	0xED

};

#define myfail(fmt, ...) \

	fail("%s: "fmt, name, ##__VA_ARGS__)

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

{

	const char *name;

	name = gnutls_session_get_ptr(session);

	if (buflen != sizeof(ext_data))

		myfail("ext_recv_client_params: Invalid input buffer length\n");

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

		myfail("ext_recv_client_params: Invalid input buffer data\n");

	TLSEXT_TYPE_client_received = 1;

	gnutls_ext_set_data(session, TLSEXT_TYPE_SAMPLE, session);

	return 0; //Success

}

static int ext_send_client_params(gnutls_session_t session, gnutls_buffer_t extdata)

{

	TLSEXT_TYPE_client_sent = 1;

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

	return sizeof(ext_data);

}

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

{

	return 0;

}

static int ext_send_client_ign_params(gnutls_session_t session, gnutls_buffer_t extdata)

{

	ign_extension_called = 1;

	return 0;

}

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

{

	const char *name;

	name = gnutls_session_get_ptr(session);

	if (buflen != sizeof(ext_data))

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

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

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

	TLSEXT_TYPE_server_received = 1;

	return 0; //Success

}

static int ext_send_server_params(gnutls_session_t session, gnutls_buffer_t extdata)

{

	TLSEXT_TYPE_server_sent = 1;

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

	return sizeof(ext_data);

}

static void client(int sd, const char *name, const char *prio, unsigned flags, unsigned expected_ok)

{

	int ret;

	gnutls_session_t session;

	gnutls_certificate_credentials_t clientx509cred;

	const char *ext_name;

	void *p;

	side = "client";

	assert(gnutls_certificate_allocate_credentials(&clientx509cred) >= 0);

	/* Initialize TLS session

	 */

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

	gnutls_session_set_ptr(session, (void*)name);

	/* Use default priorities */

	assert(gnutls_priority_set_direct(session, prio,

				   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);

	ret = gnutls_session_ext_register(session, "ext_ign", TLSEXT_TYPE_IGN, GNUTLS_EXT_TLS, ext_recv_client_ign_params, ext_send_client_ign_params, NULL, NULL, NULL, flags);

	if (ret < 0)

		myfail("client: register extension\n");

	ext_name = gnutls_ext_get_name2(session, TLSEXT_TYPE_IGN, GNUTLS_EXT_ANY);

	if (ext_name == NULL || strcmp(ext_name, "ext_ign"))

		myfail("client: retrieve name of extension %u\n", TLSEXT_TYPE_IGN);

	ext_name = gnutls_ext_get_name2(session, TLSEXT_TYPE_IGN, GNUTLS_EXT_APPLICATION);

	if (ext_name)

		myfail("client: retrieve name of extension %u (expected none)\n", TLSEXT_TYPE_IGN);

	ret = gnutls_session_ext_register(session, "ext_client", TLSEXT_TYPE_SAMPLE, GNUTLS_EXT_TLS, ext_recv_client_params, ext_send_client_params, NULL, NULL, NULL, flags);

	if (ret < 0)

		myfail("client: register extension\n");

	/* Perform the TLS handshake

	 */

	ret = gnutls_handshake(session);

	if (ret < 0) {

		if (!expected_ok) {

			if (debug)

				success("client: handshake failed as expected: %s\n", gnutls_strerror(ret));

		} else {

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

		}

		goto end;

	} else {

		if (debug)

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

	}

	if (TLSEXT_TYPE_client_sent != 1 || TLSEXT_TYPE_client_received != 1) {

		if (expected_ok) {

			myfail("client: extension not properly sent/received\n");

		} else {

			goto end;

		}

	}

	ret = gnutls_ext_get_data(session, TLSEXT_TYPE_SAMPLE, &p);

	if (ret < 0) {

		myfail("gnutls_ext_get_data: %s\n", gnutls_strerror(ret));

	}

	if (p != session) {

		myfail("client: gnutls_ext_get_data failed\n");

	}

	if (ign_extension_called == 0) {

		myfail("registered ign extension was not called\n");

	}

	gnutls_bye(session, GNUTLS_SHUT_RDWR);

	if (!expected_ok)

		myfail("client: expected failure but succeeded!\n");

end:

	close(sd);

	gnutls_deinit(session);

	gnutls_certificate_free_credentials(clientx509cred);

}

static void server(int sd, const char *name, const char *prio, unsigned flags, unsigned expected_ok)

{

	gnutls_certificate_credentials_t serverx509cred;

	int ret;

	gnutls_session_t session;

	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);

	gnutls_session_set_ptr(session, (void*)name);

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

	 * are adequate.

	 */

	assert(gnutls_priority_set_direct(session, prio,

				   NULL) >= 0);

	gnutls_credentials_set(session, GNUTLS_CRD_CERTIFICATE,

				serverx509cred);

	assert(gnutls_session_ext_register(session, "ext_server", TLSEXT_TYPE_SAMPLE, GNUTLS_EXT_TLS, ext_recv_server_params, ext_send_server_params, NULL, NULL, NULL, flags) >= 0);

	gnutls_transport_set_int(session, sd);

	gnutls_handshake_set_timeout(session, 20 * 1000);

	ret = gnutls_handshake(session);

	if (ret < 0) {

		if (!expected_ok) {

			if (debug)

				success("server: handshake failed as expected: %s\n", gnutls_strerror(ret));

			goto cleanup;

		} else {

			close(sd);

			gnutls_deinit(session);

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

			     gnutls_strerror(ret));

		}

		return;

	}

	if (debug)

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

	if (TLSEXT_TYPE_server_sent != 1 || TLSEXT_TYPE_server_received != 1) {

		if (expected_ok)

			myfail("server: extension not properly sent/received\n");

		else

			goto cleanup;

	}

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

	 */

	gnutls_bye(session, GNUTLS_SHUT_WR);

	if (!expected_ok)

		myfail("server: expected failure but succeeded!\n");

 cleanup:

	close(sd);

	gnutls_deinit(session);

	gnutls_certificate_free_credentials(serverx509cred);

	if (debug)

		success("server: finished\n");

}

#define try_common(name, prio, flags, sok, cok) \

	try(name, prio, flags, flags, sok, cok)

static void try(const char *name, const char *prio, unsigned server_flags,

		unsigned client_flags, unsigned server_ok, unsigned client_ok)

{

	pid_t child;

	int sockets[2];

	int err;

	success("Testing: %s: ", name);

	reset_vars();

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

	if (err == -1) {

		perror("socketpair");

		myfail("socketpair failed\n");

		return;

	}

	child = fork();

	if (child < 0) {

		perror("fork");

		myfail("fork");

		return;

	}

	if (child) {

		int status;

		/* parent */

		close(sockets[1]);

		server(sockets[0], name, prio, server_flags, server_ok);

		wait(&status);

		check_wait_status(status);

		success("ok");

	} else {

		close(sockets[0]);

		client(sockets[1], name, prio, client_flags, client_ok);

		_exit(0);

	}

	success("\n");

}

void doit(void)

{

	unsigned i;

	int ret;

	signal(SIGPIPE, SIG_IGN);

	global_init();

	gnutls_global_set_log_function(tls_log_func);

	if (debug)

		gnutls_global_set_log_level(5);

	try_common("TLS1.2 both ways (default)", "NORMAL:+ANON-ECDH:-VERS-TLS-ALL:+VERS-TLS1.2", 0, 1, 1);

	try_common("TLS1.2 both ways", "NORMAL:+ANON-ECDH:-VERS-TLS-ALL:+VERS-TLS1.2", GNUTLS_EXT_FLAG_CLIENT_HELLO|GNUTLS_EXT_FLAG_TLS12_SERVER_HELLO, 1, 1);

	try_common("TLS1.2 client only", "NORMAL:+ANON-ECDH:-VERS-TLS-ALL:+VERS-TLS1.2", GNUTLS_EXT_FLAG_CLIENT_HELLO, 0, 0);

	try_common("TLS1.2 client and TLS 1.3 server", "NORMAL:+ANON-ECDH:-VERS-TLS-ALL:+VERS-TLS1.2", GNUTLS_EXT_FLAG_CLIENT_HELLO|GNUTLS_EXT_FLAG_TLS13_SERVER_HELLO, 0, 0);

	try_common("TLS1.2 server only", "NORMAL:+ANON-ECDH:-VERS-TLS-ALL:+VERS-TLS1.2", GNUTLS_EXT_FLAG_TLS12_SERVER_HELLO, 0, 0);

	try("TLS1.2 client rejects", "NORMAL:+ANON-ECDH:-VERS-TLS-ALL:+VERS-TLS1.2", GNUTLS_EXT_FLAG_CLIENT_HELLO|GNUTLS_EXT_FLAG_TLS12_SERVER_HELLO, GNUTLS_EXT_FLAG_CLIENT_HELLO, 0, 0);

	try("TLS1.2 never on client hello", "NORMAL:+ANON-ECDH:-VERS-TLS-ALL:+VERS-TLS1.2", GNUTLS_EXT_FLAG_TLS12_SERVER_HELLO, GNUTLS_EXT_FLAG_CLIENT_HELLO, 0, 0);

	/* check whether we can crash the library by adding many extensions */

	success("Testing: register many global extensions\n");

	for (i=0;i<64;i++) {

		ret = gnutls_ext_register("ext_serverxx", TLSEXT_TYPE_SAMPLE+i+1, GNUTLS_EXT_TLS, ext_recv_server_params, ext_send_server_params, NULL, NULL, NULL);

		if (ret < 0) {

			success("failed registering extension no %d (expected)\n", i+1);

			break;

		}

	}

	gnutls_global_deinit();

}

#endif				/* _WIN32 */