/*

 * Copyright (C) 2017-2018 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>

#if defined(_WIN32)

int main()

{

	exit(77);

}

#else

#include <stdint.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 <gnutls/dtls.h>

#include <signal.h>

#include <string.h>

#include <assert.h>

#include "utils.h"

#include "cert-common.h"

enum {

TEST_DEF_HANDHAKE,

TEST_CUSTOM_EXT

};

/* This program tests whether the Post Handshake Auth extension is

 * present in the client hello, and whether it is missing from server

 * hello. In addition it contains basic functionality test for

 * post handshake authentication.

 */

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 int ext_send(gnutls_session_t session, gnutls_buffer_t extdata)

{

	gnutls_buffer_append_data(extdata, "\xff", 1);

	return 0;

}

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

{

	return 0;

}

#define TLS_EXT_IMPL_DTLS 0xfeee

#define TLS_EXT_EXPL_TLS 0xfeea

static void client(int fd, int type)

{

	int ret;

	gnutls_certificate_credentials_t x509_cred;

	gnutls_session_t session;

	assert(gnutls_global_init() >= 0);

	gnutls_global_set_log_function(client_log_func);

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

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

	if (type == TEST_CUSTOM_EXT) {

		assert(gnutls_session_ext_register(session, "implicit-dtls", TLS_EXT_IMPL_DTLS, GNUTLS_EXT_TLS, ext_recv, ext_send, NULL, NULL, NULL, GNUTLS_EXT_FLAG_CLIENT_HELLO|GNUTLS_EXT_FLAG_TLS12_SERVER_HELLO|GNUTLS_EXT_FLAG_TLS13_SERVER_HELLO)>=0);

		assert(gnutls_session_ext_register(session, "explicit-tls", TLS_EXT_EXPL_TLS, GNUTLS_EXT_TLS, ext_recv, ext_send, NULL, NULL, NULL, GNUTLS_EXT_FLAG_CLIENT_HELLO|GNUTLS_EXT_FLAG_TLS12_SERVER_HELLO|GNUTLS_EXT_FLAG_TLS13_SERVER_HELLO|GNUTLS_EXT_FLAG_TLS)>=0);

	}

	gnutls_handshake_set_timeout(session, 20 * 1000);

	assert(gnutls_priority_set_direct(session, "NORMAL:-VERS-TLS-ALL:+VERS-TLS1.3:+VERS-TLS1.2:+VERS-TLS1.0", 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: %s\n", gnutls_strerror(ret));

	close(fd);

	gnutls_deinit(session);

	gnutls_certificate_free_credentials(x509_cred);

	gnutls_global_deinit();

}

#define TLS_EXT_KEY_SHARE 51

#define TLS_EXT_POST_HANDSHAKE 49

struct ext_ctx_st {

	int extno;

	int found;

};

static int parse_ext(void *ctx, unsigned tls_id, const unsigned char *data, unsigned data_size)

{

	struct ext_ctx_st *s = ctx;

	if (s->extno == (int)tls_id)

		s->found = 1;

	return 0;

}

static unsigned find_client_extension(const gnutls_datum_t *msg, int extno)

{

	int ret;

	struct ext_ctx_st s;

	memset(&s, 0, sizeof(s));

	s.extno = extno;

	ret = gnutls_ext_raw_parse(&s, parse_ext, msg, GNUTLS_EXT_RAW_FLAG_DTLS_CLIENT_HELLO);

	assert(ret>=0);

	if (s.found)

		return 1;

	return 0;

}

static int hellos_callback(gnutls_session_t session, unsigned int htype,

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

{

	int *type;

	if (htype != GNUTLS_HANDSHAKE_CLIENT_HELLO || post != GNUTLS_HOOK_PRE)

		return 0;

	type = gnutls_session_get_ptr(session);

	if (find_client_extension(msg, TLS_EXT_KEY_SHARE))

		fail("Key share extension seen in client hello!\n");

	if (find_client_extension(msg, TLS_EXT_POST_HANDSHAKE))

		fail("Key share extension seen in client hello!\n");

	if (*type == TEST_CUSTOM_EXT) {

		if (!find_client_extension(msg, TLS_EXT_IMPL_DTLS))

			fail("Implicit DTLS extension not seen in client hello!\n");

		if (find_client_extension(msg, TLS_EXT_EXPL_TLS))

			fail("Explicit TLS extension seen in client hello!\n");

	}

	return 0;

}

static void server(int fd, int type)

{

	int ret;

	gnutls_session_t session;

	gnutls_certificate_credentials_t x509_cred;

	assert(gnutls_global_init() >= 0);

	gnutls_global_set_log_function(server_log_func);

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

	assert(gnutls_certificate_set_x509_key_mem(x509_cred, &server_cert,

					    &server_key,

					    GNUTLS_X509_FMT_PEM) >= 0);

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

	gnutls_handshake_set_timeout(session, 20 * 1000);

	gnutls_handshake_set_hook_function(session, GNUTLS_HANDSHAKE_ANY,

					   GNUTLS_HOOK_BOTH,

					   hellos_callback);

	gnutls_session_set_ptr(session, &type);

	assert(gnutls_priority_set_direct(session, "NORMAL:-VERS-TLS-ALL:+VERS-TLS1.3:+VERS-TLS1.2", 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));

	close(fd);

	gnutls_deinit(session);

	gnutls_certificate_free_credentials(x509_cred);

	gnutls_global_deinit();

}

static void ch_handler(int sig)

{

	int status;

	wait(&status);

	check_wait_status(status);

	return;

}

static

void start(const char *name, int type)

{

	int fd[2];

	int ret;

	pid_t child;

	signal(SIGCHLD, ch_handler);

	success("%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], type);

		kill(child, SIGTERM);

	} else {

		close(fd[0]);

		client(fd[1], type);

		exit(0);

	}

}

void doit(void) {

	start("check default extensions", TEST_DEF_HANDHAKE);

	start("check registered extensions", TEST_CUSTOM_EXT);

}

#endif				/* _WIN32 */