/*

 * Copyright (C) 2012-2018 Free Software Foundation, Inc.

 *

 * Author: Nikos Mavrogiannopoulos, Daiki Ueno

 *

 * 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(void)

{

	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 "utils.h"

#define MAX_BUF 1024

#define HIGH(x) (3*x)

static void terminate(void);

static size_t total;

/* This program tests the robustness of record sending with padding.

 */

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);

}

/* A very basic TLS client, with anonymous authentication.

 */

static ssize_t

push(gnutls_transport_ptr_t tr, const void *data, size_t len)

{

	int fd = (long int) tr;

	total += len;

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

}

struct test_st {

	const char *name;

	size_t pad;

	size_t data;

	const char *prio;

	unsigned flags;

	int sret;

};

static void client(int fd, struct test_st *test)

{

	int ret;

	char buffer[MAX_BUF + 1];

	gnutls_anon_client_credentials_t anoncred;

	gnutls_certificate_credentials_t x509_cred;

	gnutls_session_t session;

	/* Need to enable anonymous KX specifically. */

	global_init();

	if (debug) {

		gnutls_global_set_log_function(client_log_func);

		gnutls_global_set_log_level(7);

	}

	gnutls_anon_allocate_client_credentials(&anoncred);

	gnutls_certificate_allocate_credentials(&x509_cred);

	assert(gnutls_init(&session, GNUTLS_CLIENT|test->flags)>=0);

	assert(gnutls_priority_set_direct(session, test->prio, NULL)>=0);

	/* put the anonymous credentials to the current session

	 */

	gnutls_credentials_set(session, GNUTLS_CRD_ANON, anoncred);

	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("client: Handshake failed\n");

		gnutls_perror(ret);

		exit(1);

	} else {

		if (debug)

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

	}

	if (debug)

		success("client: TLS version is: %s\n",

			gnutls_protocol_get_name

			(gnutls_protocol_get_version(session)));

	do {

		do {

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

		} while (ret == GNUTLS_E_AGAIN

			 || ret == GNUTLS_E_INTERRUPTED);

	} while (ret > 0);

	if (ret == 0) {

		if (debug)

			success

			    ("client: Peer has closed the TLS connection\n");

		goto end;

	} else if (ret < 0) {

		if (ret != 0) {

			fail("client: Error: %s\n", gnutls_strerror(ret));

			exit(1);

		}

	}

	gnutls_bye(session, GNUTLS_SHUT_WR);

 end:

	close(fd);

	gnutls_deinit(session);

	gnutls_anon_free_client_credentials(anoncred);

	gnutls_certificate_free_credentials(x509_cred);

	gnutls_global_deinit();

}

/* These are global */

pid_t child;

static void terminate(void)

{

	kill(child, SIGTERM);

	exit(1);

}

static void server(int fd, struct test_st *test)

{

	int ret;

	char buffer[MAX_BUF + 1];

	gnutls_session_t session;

	gnutls_anon_server_credentials_t anoncred;

	gnutls_certificate_credentials_t x509_cred;

	size_t expected;

	/* 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(4711);

	}

	gnutls_certificate_allocate_credentials(&x509_cred);

	gnutls_certificate_set_x509_key_mem(x509_cred, &server_cert,

					    &server_key,

					    GNUTLS_X509_FMT_PEM);

	gnutls_anon_allocate_server_credentials(&anoncred);

	assert(gnutls_init(&session, GNUTLS_SERVER|test->flags)>=0);

	assert(gnutls_priority_set_direct(session, test->prio, NULL)>=0);

	gnutls_credentials_set(session, GNUTLS_CRD_ANON, anoncred);

	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) {

		close(fd);

		gnutls_deinit(session);

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

		     gnutls_strerror(ret));

		terminate();

	}

	if (debug)

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

	if (debug)

		success("server: TLS version is: %s\n",

			gnutls_protocol_get_name

			(gnutls_protocol_get_version(session)));

	gnutls_transport_set_push_function(session, push);

	assert(test->data <= sizeof(buffer));

	total = 0;

	do {

		ret =

		    gnutls_record_send2(session, buffer,

					test->data,

					test->pad, 0);

	} while (ret == GNUTLS_E_AGAIN

		 || ret == GNUTLS_E_INTERRUPTED);

	if (test->sret < 0) {

		if (ret >= 0)

			fail("server: expected failure got success!\n");

		if (ret != test->sret)

			fail("server: expected different failure: '%s', got: '%s'\n",

			     gnutls_strerror(test->sret), gnutls_strerror(ret));

		goto finish;

	}

	if (ret < 0) {

		fail("Error sending packet: %s\n",

		     gnutls_strerror(ret));

		terminate();

	}

	expected = test->data + test->pad + gnutls_record_overhead_size(session);

	if (total != expected) {

		fail("Sent data (%u) are lower than expected (%u)\n",

		     (unsigned) total, (unsigned) expected);

		terminate();

	}

 finish:

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

	 */

	gnutls_bye(session, GNUTLS_SHUT_WR);

	close(fd);

	gnutls_deinit(session);

	gnutls_anon_free_server_credentials(anoncred);

	gnutls_certificate_free_credentials(x509_cred);

	gnutls_global_deinit();

	if (debug)

		success("server: finished\n");

}

static void start(struct test_st *test)

{

	int fd[2];

	int ret;

	success("running %s\n", test->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], test);

		kill(child, SIGTERM);

	} else {

		close(fd[0]);

		client(fd[1], test);

		exit(0);

	}

}

#define AES_GCM "NONE:+VERS-TLS1.3:+AES-256-GCM:+AEAD:+SIGN-ALL:+GROUP-ALL"

static void ch_handler(int sig)

{

	int status;

	wait(&status);

	check_wait_status(status);

	return;

}

struct test_st tests[] =

{

	{

		.name = "AES-GCM with max pad",

		.pad = HIGH(MAX_BUF+1)-(MAX_BUF+1),

		.data = MAX_BUF,

		.prio = AES_GCM,

		.flags = 0

	},

	{

		.name = "AES-GCM with zero pad",

		.pad = 0,

		.data = MAX_BUF,

		.prio = AES_GCM,

		.flags = 0

	},

	{

		.name = "AES-GCM with 1-byte pad",

		.pad = 1,

		.data = MAX_BUF,

		.prio = AES_GCM,

		.flags = 0

	},

	{

		.name = "AES-GCM with pad, but no data",

		.pad = 16,

		.data = 0,

		.prio = AES_GCM,

		.flags = 0

	},

	{

		.name = "AES-GCM with max pad and safe padding check",

		.pad = HIGH(MAX_BUF+1)-(MAX_BUF+1),

		.data = MAX_BUF,

		.prio = AES_GCM,

		.flags = GNUTLS_SAFE_PADDING_CHECK

	},

	{

		.name = "AES-GCM with zero pad and safe padding check",

		.pad = 0,

		.data = MAX_BUF,

		.prio = AES_GCM,

		.flags = GNUTLS_SAFE_PADDING_CHECK

	},

	{

		.name = "AES-GCM with 1-byte pad and safe padding check",

		.pad = 1,

		.data = MAX_BUF,

		.prio = AES_GCM,

		.flags = GNUTLS_SAFE_PADDING_CHECK

	},

	{

		.name = "AES-GCM with pad, but no data and safe padding check",

		.pad = 16,

		.data = 0,

		.prio = AES_GCM,

		.flags = GNUTLS_SAFE_PADDING_CHECK

	},

	{

		.name = "AES-GCM with pad, but no data and no pad",

		.pad = 0,

		.data = 0,

		.prio = AES_GCM,

		.flags = GNUTLS_SAFE_PADDING_CHECK,

		.sret = GNUTLS_E_INVALID_REQUEST

	},

};

void doit(void)

{

	unsigned i;

	signal(SIGCHLD, ch_handler);

	for (i=0;i

		start(&tests[i]);

	}

}

#endif				/* _WIN32 */