/*

 * Copyright (C) 2017 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 <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 <gnutls/gnutls.h>

#include <gnutls/dtls.h>

#include <signal.h>

#include <assert.h>

#include <errno.h>

#include "cert-common.h"

#include "utils.h"

/* This program tests whether the ChangeCipherSpec message

 * is ignored during handshake.

 */

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 unsigned client_sent_ccs = 0;

static unsigned server_sent_ccs = 0;

static int cli_hsk_callback(gnutls_session_t session, unsigned int htype,

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

static void client(int fd, unsigned ccs_check)

{

	int ret;

	gnutls_certificate_credentials_t x509_cred;

	gnutls_session_t session;

	char buf[64];

	global_init();

	client_sent_ccs = 0;

	server_sent_ccs = 0;

	if (debug) {

		gnutls_global_set_log_function(client_log_func);

		gnutls_global_set_log_level(7);

	}

	gnutls_certificate_allocate_credentials(&x509_cred);

	/* Initialize TLS session

	 */

	gnutls_init(&session, GNUTLS_CLIENT|GNUTLS_POST_HANDSHAKE_AUTH);

	gnutls_session_set_ptr(session, &ccs_check);

	gnutls_handshake_set_timeout(session, 20 * 1000);

	if (ccs_check) {

		gnutls_handshake_set_hook_function(session, GNUTLS_HANDSHAKE_ANY,

						   GNUTLS_HOOK_PRE,

						   cli_hsk_callback);

	}

	ret = gnutls_priority_set_direct(session, "NORMAL:-VERS-ALL:+VERS-TLS1.3:+VERS-TLS1.2:+VERS-TLS1.0", NULL);

	if (ret < 0)

		fail("cannot set TLS 1.3 priorities\n");

	gnutls_certificate_set_x509_key_mem(x509_cred, &cli_ca3_cert,

					    &cli_ca3_key,

					    GNUTLS_X509_FMT_PEM);

	/* put the anonymous credentials to the current session

	 */

	gnutls_credentials_set(session, GNUTLS_CRD_CERTIFICATE, x509_cred);

	gnutls_transport_set_int(session, fd);

	/* Perform the TLS handshake

	 */

	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));

	success("client handshake completed\n");

	do {

		ret = gnutls_record_recv(session, buf, sizeof(buf));

	} while (ret == GNUTLS_E_AGAIN || ret == GNUTLS_E_INTERRUPTED);

	if (ret < 0)

		fail("client: recv did not succeed as expected: %s\n", gnutls_strerror(ret));

	/* send change cipher spec, this should fail in the server */

	do {

		ret = send(fd, "\x14\x03\x03\x00\x01\x01", 6, 0);

	} while(ret == -1 && (errno == EINTR || errno == EAGAIN));

	close(fd);

	gnutls_deinit(session);

	if (ccs_check) {

		if (client_sent_ccs != 1) {

			fail("client: did not sent CCS\n");

		}

	}

	gnutls_certificate_free_credentials(x509_cred);

	gnutls_global_deinit();

}

static int cli_hsk_callback(gnutls_session_t session, unsigned int htype,

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

{

	unsigned *p;

	unsigned ccs_check;

	static unsigned hello_received = 0;

	p = gnutls_session_get_ptr(session);

	ccs_check = *p;

	assert(ccs_check != 0);

	assert(post == GNUTLS_HOOK_PRE);

	if (htype == GNUTLS_HANDSHAKE_CLIENT_HELLO && !incoming) {

		hello_received = 1;

		gnutls_handshake_set_hook_function(session, GNUTLS_HANDSHAKE_CHANGE_CIPHER_SPEC,

						   GNUTLS_HOOK_PRE,

						   cli_hsk_callback);

	}

	if (htype == GNUTLS_HANDSHAKE_CHANGE_CIPHER_SPEC && !incoming && hello_received) {

		client_sent_ccs++;

		assert(msg->size == 1 && msg->data[0] == 0x01);

	}

	return 0;

}

static int hsk_callback(gnutls_session_t session, unsigned int htype,

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

{

	int ret;

	int fd;

	unsigned *p;

	unsigned ccs_check;

	p = gnutls_session_get_ptr(session);

	ccs_check = *p;

	assert(post == GNUTLS_HOOK_PRE);

	if (!ccs_check) {

		if (!incoming || htype == GNUTLS_HANDSHAKE_CLIENT_HELLO ||

		    htype == GNUTLS_HANDSHAKE_FINISHED)

			return 0;

		fd = gnutls_transport_get_int(session);

		/* send change cipher spec */

		do {

			ret = send(fd, "\x14\x03\x03\x00\x01\x01", 6, 0);

		} while(ret == -1 && (errno == EINTR || errno == EAGAIN));

	} else { /* checking whether server received it */

		if (htype == GNUTLS_HANDSHAKE_CHANGE_CIPHER_SPEC && !incoming) {

			server_sent_ccs++;

			assert(msg->size == 1 && msg->data[0] == 0x01);

		}

	}

	return 0;

}

static void server(int fd, unsigned ccs_check)

{

	int ret;

	gnutls_session_t session;

	gnutls_certificate_credentials_t x509_cred;

	char buf[64];

	/* this must be called once in the program

	 */

	global_init();

	client_sent_ccs = 0;

	server_sent_ccs = 0;

	if (debug) {

		gnutls_global_set_log_function(server_log_func);

		gnutls_global_set_log_level(4711);

	}

	gnutls_certificate_allocate_credentials(&x509_cred);

	gnutls_certificate_set_x509_key_mem(x509_cred, &server_cert,

					    &server_key,

					    GNUTLS_X509_FMT_PEM);

	gnutls_init(&session, GNUTLS_SERVER);

	gnutls_handshake_set_timeout(session, 20 * 1000);

	if (ccs_check)

		gnutls_handshake_set_hook_function(session, GNUTLS_HANDSHAKE_CHANGE_CIPHER_SPEC,

						   GNUTLS_HOOK_PRE,

						   hsk_callback);

	else

		gnutls_handshake_set_hook_function(session, GNUTLS_HANDSHAKE_ANY,

						   GNUTLS_HOOK_PRE,

						   hsk_callback);

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

	 * are adequate.

	 */

	assert(gnutls_priority_set_direct(session, "NORMAL:+VERS-TLS1.3", NULL) >= 0);

	gnutls_session_set_ptr(session, &ccs_check);

	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));

	success("server handshake completed\n");

	gnutls_certificate_server_set_request(session, GNUTLS_CERT_REQUIRE);

	/* ask peer for re-authentication */

	do {

		ret = gnutls_record_send(session, "\x00", 1);

	} while (ret == GNUTLS_E_AGAIN || ret == GNUTLS_E_INTERRUPTED);

	if (ret < 0)

		fail("server: gnutls_record_send did not succeed as expected: %s\n", gnutls_strerror(ret));

	/* receive CCS and fail */

	do {

		ret = gnutls_record_recv(session, buf, sizeof(buf));

	} while (ret == GNUTLS_E_AGAIN || ret == GNUTLS_E_INTERRUPTED);

	if (ret != GNUTLS_E_UNEXPECTED_PACKET)

		fail("server: incorrect alert sent: %d != %d\n",

		     ret, GNUTLS_E_UNEXPECTED_PACKET);

	close(fd);

	gnutls_deinit(session);

	gnutls_certificate_free_credentials(x509_cred);

	if (ccs_check) {

		if (server_sent_ccs != 1) {

			fail("server: did not sent CCS\n");

		}

	}

	gnutls_global_deinit();

	if (debug)

		success("server: client/server hello were verified\n");

}

static void ch_handler(int sig)

{

	int status;

	wait(&status);

	check_wait_status(status);

	return;

}

static

void start(unsigned ccs_check)

{

	int fd[2];

	int ret;

	pid_t child;

	signal(SIGCHLD, ch_handler);

	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) {

		/* parent */

		close(fd[1]);

		server(fd[0], ccs_check);

		kill(child, SIGTERM);

	} else {

		close(fd[0]);

		client(fd[1], ccs_check);

		exit(0);

	}

}

void doit(void)

{

	start(0);

	start(1);

}

#endif				/* _WIN32 */