/*

 * 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 <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 "cert-common.h"

#include "tls13/ext-parse.h"

#include "utils.h"

#define MAX_AUTHS 4

/* 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);

}

#define MAX_BUF 1024

#define MAX_APP_DATA 3

static void client(int fd, unsigned send_cert, unsigned max_auths)

{

	int ret;

	gnutls_certificate_credentials_t x509_cred;

	gnutls_session_t session;

	char buf[64];

	unsigned i;

	global_init();

	if (debug) {

		gnutls_global_set_log_function(client_log_func);

		gnutls_global_set_log_level(7);

	}

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

	/* Initialize TLS session

	 */

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

	gnutls_handshake_set_timeout(session, 20 * 1000);

	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");

	if (send_cert) {

		assert(gnutls_certificate_set_x509_key_mem(x509_cred, &cli_ca3_cert,

						    &cli_ca3_key,

						    GNUTLS_X509_FMT_PEM)>=0);

	}

	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));

	if (debug)

		success("client handshake completed\n");

	gnutls_record_set_timeout(session, 20 * 1000);

	for (i=0;i

		if (debug)

			success("waiting for auth nr %d\n", i);

		do {

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

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

		if (ret < 0)

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

	}

	assert(ret == 0);

	do {

		ret = gnutls_bye(session, GNUTLS_SHUT_WR);

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

	close(fd);

	gnutls_deinit(session);

	gnutls_certificate_free_credentials(x509_cred);

	gnutls_global_deinit();

}

static unsigned client_hello_ok = 0;

static unsigned server_hello_ok = 0;

#define TLS_EXT_POST_HANDSHAKE 49

static void parse_ext(void *priv, gnutls_datum_t *msg)

{

	if (msg->size != 0) {

		fail("error in extension length: %d\n", (int)msg->size);

	}

}

static int hellos_callback(gnutls_session_t session, unsigned int htype,

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

{

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

		if (find_server_extension(msg, TLS_EXT_POST_HANDSHAKE, NULL, NULL)) {

			fail("Post handshake extension seen in server hello!\n");

		}

		server_hello_ok = 1;

		return GNUTLS_E_INTERRUPTED;

	}

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

		return 0;

	if (find_client_extension(msg, TLS_EXT_POST_HANDSHAKE, NULL, parse_ext))

		client_hello_ok = 1;

	else

		fail("Post handshake extension NOT seen in client hello!\n");

	return 0;

}

static void server(int fd, int err, int type, unsigned max_auths)

{

	int ret;

	char buffer[MAX_BUF + 1];

	gnutls_session_t session;

	gnutls_certificate_credentials_t x509_cred;

	unsigned i, retries;

	/* this must be called once in the program

	 */

	global_init();

	memset(buffer, 0, sizeof(buffer));

	if (debug) {

		gnutls_global_set_log_function(server_log_func);

		gnutls_global_set_log_level(6);

	}

	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_POST_HANDSHAKE_AUTH);

	gnutls_handshake_set_timeout(session, 20 * 1000);

	gnutls_handshake_set_hook_function(session, GNUTLS_HANDSHAKE_ANY,

					   GNUTLS_HOOK_BOTH,

					   hellos_callback);

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

	 * are adequate.

	 */

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

	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));

	if (!(gnutls_session_get_flags(session) & GNUTLS_SFLAGS_POST_HANDSHAKE_AUTH)) {

		fail("server: session flags did not contain GNUTLS_SFLAGS_POST_HANDSHAKE_AUTH\n");

	}

	if (client_hello_ok == 0) {

		fail("server: did not verify the client hello\n");

	}

	if (server_hello_ok == 0) {

		fail("server: did not verify the server hello contents\n");

	}

	if (debug)

		success("server handshake completed\n");

	gnutls_certificate_server_set_request(session, type);

	/* i = 0 */

	/* ask peer for re-authentication */

	retries = 0;

	do {

		do {

			ret = gnutls_reauth(session, 0);

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

		if (ret == GNUTLS_E_GOT_APPLICATION_DATA) {

			int ret2;

			do {

				ret2 = gnutls_record_recv(session, buffer, sizeof(buffer));

			} while (ret2 == GNUTLS_E_AGAIN || ret2 == GNUTLS_E_INTERRUPTED);

			if (ret2 < 0)

				fail("error receiving app data: %s\n", gnutls_strerror(ret2));

			/* sender memsets the message with the retry attempt */

			assert((uint8_t)buffer[0] == retries);

			assert(retries < MAX_APP_DATA);

		}

		retries++;

	} while (ret == GNUTLS_E_GOT_APPLICATION_DATA);

	if (err) {

		if (ret != err)

			fail("server: expected error %s, got: %s\n", gnutls_strerror(err),

			     gnutls_strerror(ret));

	} else if (ret != 0)

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

	for (i=1;i

		/* ask peer for re-authentication */

		do {

			ret = gnutls_reauth(session, 0);

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

		if (err) {

			if (ret != err)

				fail("server: expected error %s, got: %s\n", gnutls_strerror(err),

				     gnutls_strerror(ret));

		} else if (ret != 0)

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

	}

	do {

		ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);

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

	close(fd);

	gnutls_deinit(session);

	gnutls_certificate_free_credentials(x509_cred);

	gnutls_global_deinit();

	if (debug)

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

}

static

void start(const char *name, int err, int type, unsigned max_auths, unsigned send_cert)

{

	int fd[2];

	int ret;

	pid_t child;

	int status = 0;

	success("testing %s\n", name);

	client_hello_ok = 0;

	server_hello_ok = 0;

	signal(SIGCHLD, SIG_IGN);

	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], err, type, max_auths);

		kill(child, SIGTERM);

		wait(&status);

		check_wait_status(status);

	} else {

		close(fd[0]);

		client(fd[1], send_cert, max_auths);

		exit(0);

	}

}

void doit(void)

{

	start("multi-reauth", 0, GNUTLS_CERT_REQUIRE, MAX_AUTHS, 1);

	start("reauth-require with no-cert", GNUTLS_E_CERTIFICATE_REQUIRED, GNUTLS_CERT_REQUIRE, 1, 0);

	start("reauth-request with no-cert", 0, GNUTLS_CERT_REQUEST, 1, 0);

}

#endif				/* _WIN32 */