/*

 * Copyright (C) 2016 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 General Public License

 * along with GnuTLS; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA

 */

#ifdef HAVE_CONFIG_H

#include <config.h>

#endif

#include <stdio.h>

#include <stdlib.h>

/* In this test we check whether the server will bail out after receiving

 * a bunch of warning alerts. That is to avoid DoS due to the assymetry of

 * cost of sending an alert vs the cost of receiving.

 */

#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>

#endif

#include <unistd.h>

#include <assert.h>

#include <gnutls/gnutls.h>

#include "utils.h"

#include "cert-common.h"

pid_t child;

static void tls_log_func(int level, const char *str)

{

	fprintf(stderr, "%s |<%d>| %s", child ? "server" : "client", level,

		str);

}

static unsigned char tls_hello[] =

	"\x16\x03\x01\x01\x38\x01\x00\x01"

	"\x34\x03\x03\xfc\x77\xa8\xc7\x46"

	"\xf7\xfd\x04\x5b\x3c\xc6\xfa\xa4"

	"\xea\x3e\xfa\x76\x99\xfe\x1a\x2e"

	"\xe0\x79\x17\xb2\x27\x06\xc4\x5c"

	"\xd8\x78\x31\x00\x00\xb6\xc0\x30"

	"\xc0\x2c\xc0\x28\xc0\x24\xc0\x14"

	"\xc0\x0a\x00\xa5\x00\xa3\x00\xa1"

	"\x00\x9f\x00\x6b\x00\x6a\x00\x69"

	"\x00\x68\x00\x39\x00\x38\x00\x37"

	"\x00\x36\x00\x88\x00\x87\x00\x86"

	"\x00\x85\xc0\x32\xc0\x2e\xc0\x2a"

	"\xc0\x26\xc0\x0f\xc0\x05\x00\x9d"

	"\x00\x3d\x00\x35\x00\x84\xc0\x2f"

	"\xc0\x2b\xc0\x27\xc0\x23\xc0\x13"

	"\xc0\x09\x00\xa4\x00\xa2\x00\xa0"

	"\x00\x9e\x00\x67\x00\x40\x00\x3f"

	"\x00\x3e\x00\x33\x00\x32\x00\x31"

	"\x00\x30\x00\x9a\x00\x99\x00\x98"

	"\x00\x97\x00\x45\x00\x44\x00\x43"

	"\x00\x42\xc0\x31\xc0\x2d\xc0\x29"

	"\xc0\x25\xc0\x0e\xc0\x04\x00\x9c"

	"\x00\x3c\x00\x2f\x00\x96\x00\x41"

	"\x00\x07\xc0\x11\xc0\x07\xc0\x0c"

	"\xc0\x02\x00\x05\x00\x04\xc0\x12"

	"\xc0\x08\x00\x16\x00\x13\x00\x10"

	"\x00\x0d\xc0\x0d\xc0\x03\x00\x0a"

	"\x00\x15\x00\x12\x00\x0f\x00\x0c"

	"\x00\x09\x00\xff\x01\x00\x00\x55"

	"\x00\x0b\x00\x04\x03\x00\x01\x02"

	"\x00\x0a\x00\x1c\x00\x1a\x00\x17"

	"\x00\x19\x00\x1c\x00\x1b\x00\x18"

	"\x00\x1a\x00\x16\x00\x0e\x00\x0d"

	"\x00\x0b\x00\x0c\x00\x09\x00\x0a"

	"\x00\x23\x00\x00\x00\x0d\x00\x20"

	"\x00\x1e\x06\x01\x06\x02\x06\x03"

	"\x05\x01\x05\x02\x05\x03\x04\x01"

	"\x04\x02\x04\x03\x03\x01\x03\x02"

	"\x03\x03\x02\x01\x02\x02\x02\x03"

	"\x00\x0f\x00\x01\x01";

static unsigned char tls_alert[] = 

	"\x15\x03\x03\x00\x02\x00\x0A";

static void client(int sd)

{

	char buf[1024];

	int ret;

	unsigned i;

	/* send a TLS hello, and then a list of warning alerts */

	ret = send(sd, tls_hello, sizeof(tls_hello)-1, 0);

	if (ret < 0)

		fail("error sending hello\n");

	ret = recv(sd, buf, sizeof(buf), 0);

	if (ret < 0)

		fail("error receiving hello\n");

	for (i=0;i<128;i++) {

		ret = send(sd, tls_alert, sizeof(tls_alert)-1, 0);

		if (ret < 0)

			fail("error sending hello\n");

	}

	close(sd);

}

static void server(int sd)

{

	gnutls_certificate_credentials_t x509_cred;

	gnutls_session_t session;

	int ret;

	unsigned loops;

	/* this must be called once in the program

	 */

	global_init();

	gnutls_global_set_log_function(tls_log_func);

	if (debug)

		gnutls_global_set_log_level(6);

	gnutls_certificate_allocate_credentials(&x509_cred);

	gnutls_certificate_set_x509_trust_mem(x509_cred, &ca3_cert,

					      GNUTLS_X509_FMT_PEM);

	gnutls_certificate_set_x509_key_mem(x509_cred, &server_ca3_localhost_cert,

					    &server_ca3_key,

					    GNUTLS_X509_FMT_PEM);

	if (debug)

		success("Launched, generating DH parameters...\n");

	gnutls_init(&session, GNUTLS_SERVER);

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

	 * are adequate.

	 */

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

	gnutls_credentials_set(session, GNUTLS_CRD_CERTIFICATE, x509_cred);

	gnutls_transport_set_int(session, sd);

	loops = 0;

	do {

		ret = gnutls_handshake(session);

		loops++;

		if (loops > 64)

			fail("Too many loops in the handshake!\n");

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

	if (ret >= 0) {

		fail("server: Handshake succeeded unexpectedly\n");

	}

	close(sd);

	gnutls_deinit(session);

	gnutls_certificate_free_credentials(x509_cred);

	gnutls_global_deinit();

	if (debug)

		success("server: finished\n");

}

void doit(void)

{

	int sockets[2];

	int err;

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

	if (err == -1) {

		perror("socketpair");

		fail("socketpair failed\n");

		return;

	}

	child = fork();

	if (child < 0) {

		perror("fork");

		fail("fork");

		return;

	}

	if (child) {

		int status;

		server(sockets[0]);

		wait(&status);

		check_wait_status(status);

	} else {

		client(sockets[1]);

		exit(0);

	}

}

#endif				/* _WIN32 */