/*

 * Copyright (C) 2004-2012 Free Software Foundation, Inc.

 * Copyright (C) 2013 Adam Sampson <ats@offog.org>

 *

 * Author: Simon Josefsson

 *

 * 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

 */

/* Parts copied from GnuTLS example programs. */

#ifdef HAVE_CONFIG_H

#include <config.h>

#endif

#include <stdio.h>

#include <stdlib.h>

#include "cert-common.h"

#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 <signal.h>

#include <gnutls/gnutls.h>

#include <gnutls/abstract.h>

#include "utils.h"

#include "ex-session-info.c"

#include "ex-x509-info.c"

pid_t child;

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

{

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

		str);

}

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

 */

#define MAX_BUF 1024

#define MSG "Hello TLS"

#define EXPECT_RDN0 "CA-3"

static int

cert_callback(gnutls_session_t session,

	      const gnutls_datum_t * req_ca_rdn, int nreqs,

	      const gnutls_pk_algorithm_t * sign_algos,

	      int sign_algos_length, gnutls_pcert_st ** pcert,

	      unsigned int *pcert_length, gnutls_privkey_t * pkey)

{

	int result;

	gnutls_x509_dn_t dn;

	if (nreqs != 1) {

		fail("client: invoked to provide client cert, but %d CAs are requested by server.\n",

		     nreqs);

		return -1;

	}

	if (debug)

		success("client: invoked to provide client cert.\n");

	result = gnutls_x509_dn_init(&dn;;

	if (result < 0) {

		fail("client: could not initialize DN.\n");

		return -1;

	}

	result = gnutls_x509_dn_import(dn, req_ca_rdn);

	if (result == 0) {

		gnutls_x509_ava_st val;

		if (debug)

			success("client: imported DN.\n");

		if (gnutls_x509_dn_get_rdn_ava(dn, 0, 0, &val) == 0) {

			if (debug)

				success("client: got RDN 0.\n");

			if (val.value.size == strlen(EXPECT_RDN0)

			    && strncmp((char *) val.value.data,

					EXPECT_RDN0, val.value.size) == 0) {

				if (debug)

					success

					    ("client: RND 0 correct.\n");

			} else {

				fail("client: RND 0 bad: %.*s\n",

				     val.value.size, val.value.data);

				return -1;

			}

		} else {

			fail("client: could not retrieve RDN 0.\n");

			return -1;

		}

		gnutls_x509_dn_deinit(dn);

	} else {

		fail("client: failed to parse RDN: %s\n",

		     gnutls_strerror(result));

	}

	return 0;

}

static void client(int sd)

{

	int ret, ii;

	gnutls_session_t session;

	char buffer[MAX_BUF + 1];

	gnutls_certificate_credentials_t xcred;

	global_init();

	gnutls_global_set_log_function(tls_log_func);

	if (debug)

		gnutls_global_set_log_level(4711);

	gnutls_certificate_allocate_credentials(&xcred);

	/* sets the trusted cas file

	 */

	ret = gnutls_certificate_set_x509_trust_mem(xcred, &ca3_cert,

					      GNUTLS_X509_FMT_PEM);

	if (ret <= 0) {

		fail("client: no CAs loaded!\n");

		goto end;

	}

	gnutls_certificate_set_retrieve_function2(xcred, cert_callback);

	/* Initialize TLS session

	 */

	gnutls_init(&session, GNUTLS_CLIENT);

	/* Use default priorities */

	gnutls_priority_set_direct(session, "NORMAL", NULL);

	/* put the x509 credentials to the current session

	 */

	gnutls_credentials_set(session, GNUTLS_CRD_CERTIFICATE, xcred);

	gnutls_transport_set_int(session, sd);

	/* Perform the TLS handshake

	 */

	ret = gnutls_handshake(session);

	if (ret < 0) {

		fail("client: Handshake failed\n");

		gnutls_perror(ret);

		goto end;

	} 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)));

	/* see the Getting peer's information example */

	if (debug)

		print_info(session);

	gnutls_record_send(session, MSG, strlen(MSG));

	ret = gnutls_record_recv(session, buffer, MAX_BUF);

	if (ret == 0) {

		if (debug)

			success

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

		goto end;

	} else if (ret < 0) {

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

		goto end;

	}

	if (debug) {

		printf("- Received %d bytes: ", ret);

		for (ii = 0; ii < ret; ii++) {

			fputc(buffer[ii], stdout);

		}

		fputs("\n", stdout);

	}

	gnutls_bye(session, GNUTLS_SHUT_RDWR);

      end:

	close(sd);

	gnutls_deinit(session);

	gnutls_certificate_free_credentials(xcred);

	gnutls_global_deinit();

}

/* This is a sample TLS 1.0 echo server, using X.509 authentication.

 */

#define MAX_BUF 1024

#define DH_BITS 1024

/* These are global */

static gnutls_dh_params_t dh_params;

static int generate_dh_params(void)

{

	const gnutls_datum_t p3 = { (void *) pkcs3, strlen(pkcs3) };

	/* Generate Diffie-Hellman parameters - for use with DHE

	 * kx algorithms. These should be discarded and regenerated

	 * once a day, once a week or once a month. Depending on the

	 * security requirements.

	 */

	gnutls_dh_params_init(&dh_params);

	return gnutls_dh_params_import_pkcs3(dh_params, &p3,

					     GNUTLS_X509_FMT_PEM);

}

static void server(int sd)

{

gnutls_certificate_credentials_t x509_cred;

int ret;

gnutls_session_t session;

char buffer[MAX_BUF + 1];

	/* 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(4711);

	gnutls_certificate_allocate_credentials(&x509_cred);

	ret = gnutls_certificate_set_x509_trust_mem(x509_cred, &ca3_cert,

					      GNUTLS_X509_FMT_PEM);

	if (ret == 0) {

		fail("server: no CAs loaded\n");

	}

	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");

	generate_dh_params();

	gnutls_certificate_set_dh_params(x509_cred, dh_params);

	gnutls_init(&session, GNUTLS_SERVER);

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

	 * are adequate.

	 */

	gnutls_priority_set_direct(session, "NORMAL", NULL);

	gnutls_credentials_set(session, GNUTLS_CRD_CERTIFICATE, x509_cred);

	/* request client certificate if any.

	 */

	gnutls_certificate_server_set_request(session,

					      GNUTLS_CERT_REQUEST);

	gnutls_dh_set_prime_bits(session, DH_BITS);

	gnutls_transport_set_int(session, sd);

	gnutls_handshake_set_timeout(session, 20 * 1000);

	ret = gnutls_handshake(session);

	if (ret < 0) {

		close(sd);

		gnutls_deinit(session);

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

		     gnutls_strerror(ret));

		return;

	}

	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)));

	/* see the Getting peer's information example */

	if (debug)

		print_info(session);

	for (;;) {

		memset(buffer, 0, MAX_BUF + 1);

		ret = gnutls_record_recv(session, buffer, MAX_BUF);

		if (ret == 0) {

			if (debug)

				success

				    ("server: Peer has closed the GnuTLS connection\n");

			break;

		} else if (ret < 0) {

			fail("server: Received corrupted data(%d). Closing...\n", ret);

			break;

		} else if (ret > 0) {

			/* echo data back to the client

			 */

			gnutls_record_send(session, buffer,

					   strlen(buffer));

		}

	}

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

	 */

	gnutls_bye(session, GNUTLS_SHUT_WR);

	close(sd);

	gnutls_deinit(session);

	gnutls_certificate_free_credentials(x509_cred);

	gnutls_dh_params_deinit(dh_params);

	gnutls_global_deinit();

	if (debug)

		success("server: finished\n");

}

void doit(void)

{

	int sockets[2];

	int err;

	signal(SIGPIPE, SIG_IGN);

	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;

		/* parent */

		close(sockets[1]);

		server(sockets[0]);

		wait(&status);

		check_wait_status(status);

	} else {

		close(sockets[0]);

		client(sockets[1]);

	}

}

#endif				/* _WIN32 */