/*

 * Copyright (C) 2015-2016 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

/* This program tests the various certificate key exchange methods supported

 * in gnutls */

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#include <errno.h>

#include <gnutls/gnutls.h>

#include <gnutls/dtls.h>

#include "utils.h"

#include "eagain-common.h"

#include "common-cert-key-exchange.h"

const char *side;

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

{

	fprintf(stderr, "%s|<%d>| %s", side, level, str);

}

#define MSG "hello there ppl"

void try_with_key(const char *name, const char *client_prio, gnutls_kx_algorithm_t client_kx,

		gnutls_sign_algorithm_t server_sign_algo,

		gnutls_sign_algorithm_t client_sign_algo,

		const gnutls_datum_t *serv_cert,

		const gnutls_datum_t *serv_key,

		const gnutls_datum_t *client_cert,

		const gnutls_datum_t *client_key,

		unsigned cert_flags)

{

	int ret;

	char buffer[256];

	/* Server stuff. */

	gnutls_certificate_credentials_t serverx509cred;

	gnutls_anon_server_credentials_t s_anoncred;

	gnutls_dh_params_t dh_params;

	const gnutls_datum_t p3 =

	    { (unsigned char *) pkcs3, strlen(pkcs3) };

	gnutls_session_t server;

	int sret = GNUTLS_E_AGAIN;

	/* Client stuff. */

	gnutls_certificate_credentials_t clientx509cred;

	gnutls_anon_client_credentials_t c_anoncred;

	gnutls_session_t client;

	int cret = GNUTLS_E_AGAIN, version;

	const char *err;

	/* General init. */

	gnutls_global_set_log_function(tls_log_func);

	if (debug)

		gnutls_global_set_log_level(6);

	reset_buffers();

	/* Init server */

	gnutls_anon_allocate_server_credentials(&s_anoncred);

	gnutls_certificate_allocate_credentials(&serverx509cred);

	ret = gnutls_certificate_set_x509_key_mem(serverx509cred,

					    serv_cert, serv_key,

					    GNUTLS_X509_FMT_PEM);

	if (ret < 0) {

		fail("Could not set key/cert: %s\n", gnutls_strerror(ret));

	}

	gnutls_dh_params_init(&dh_params);

	gnutls_dh_params_import_pkcs3(dh_params, &p3, GNUTLS_X509_FMT_PEM);

	gnutls_certificate_set_dh_params(serverx509cred, dh_params);

	gnutls_anon_set_server_dh_params(s_anoncred, dh_params);

	gnutls_init(&server, GNUTLS_SERVER);

	gnutls_credentials_set(server, GNUTLS_CRD_CERTIFICATE,

				serverx509cred);

	gnutls_credentials_set(server, GNUTLS_CRD_ANON, s_anoncred);

	gnutls_priority_set_direct(server,

				   /*"NORMAL:+VERS-SSL3.0:+ANON-ECDH:+ANON-DH:+ECDHE-RSA:+DHE-RSA:+RSA:+ECDHE-ECDSA:+CURVE-X25519:+SIGN-EDDSA-ED25519",*/

				   "NORMAL:+VERS-SSL3.0:+ANON-ECDH:+ANON-DH:+ECDHE-RSA:+DHE-RSA:+RSA:+ECDHE-ECDSA:+CURVE-X25519:+SIGN-EDDSA-ED25519:+SIGN-RSA-PSS-SHA256:+SIGN-RSA-PSS-SHA384:+SIGN-RSA-PSS-SHA512",

				   NULL);

	gnutls_transport_set_push_function(server, server_push);

	gnutls_transport_set_pull_function(server, server_pull);

	gnutls_transport_set_ptr(server, server);

	/* Init client */

	ret = gnutls_certificate_allocate_credentials(&clientx509cred);

	if (ret < 0)

		exit(1);

	if (cert_flags == USE_CERT) {

		gnutls_certificate_set_x509_key_mem(clientx509cred,

						    client_cert, client_key,

						    GNUTLS_X509_FMT_PEM);

		gnutls_certificate_server_set_request(server, GNUTLS_CERT_REQUIRE);

	} else if (cert_flags == ASK_CERT) {

		gnutls_certificate_server_set_request(server, GNUTLS_CERT_REQUEST);

	}

#if 0

	ret = gnutls_certificate_set_x509_trust_mem(clientx509cred, &ca_cert, GNUTLS_X509_FMT_PEM);

	if (ret < 0)

		exit(1);

#endif

	ret = gnutls_init(&client, GNUTLS_CLIENT);

	if (ret < 0)

		exit(1);

	gnutls_anon_allocate_client_credentials(&c_anoncred);

	gnutls_credentials_set(client, GNUTLS_CRD_ANON, c_anoncred);

	ret = gnutls_credentials_set(client, GNUTLS_CRD_CERTIFICATE,

				clientx509cred);

	if (ret < 0)

		exit(1);

	gnutls_transport_set_push_function(client, client_push);

	gnutls_transport_set_pull_function(client, client_pull);

	gnutls_transport_set_ptr(client, client);

	ret = gnutls_priority_set_direct(client, client_prio, &err;;

	if (ret < 0) {

		if (ret == GNUTLS_E_INVALID_REQUEST)

			fprintf(stderr, "Error in %s\n", err);

		exit(1);

	}

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

	HANDSHAKE(client, server);

	if (gnutls_kx_get(client) != client_kx) {

		fail("%s: got unexpected key exchange algorithm: %s (expected %s)\n", name, gnutls_kx_get_name(gnutls_kx_get(client)),

			gnutls_kx_get_name(client_kx));

		exit(1);

	}

	/* test signature algorithm match */

	version = gnutls_protocol_get_version(client);

	if (version >= GNUTLS_TLS1_2) {

		ret = gnutls_sign_algorithm_get(server);

		if (ret != (int)server_sign_algo) {

			fail("%s: got unexpected server signature algorithm: %d/%s\n", name, ret, gnutls_sign_get_name(ret));

			exit(1);

		}

		ret = gnutls_sign_algorithm_get_client(server);

		if (ret != (int)client_sign_algo) {

			fail("%s: got unexpected client signature algorithm: %d/%s\n", name, ret, gnutls_sign_get_name(ret));

			exit(1);

		}

		ret = gnutls_sign_algorithm_get(client);

		if (ret != (int)server_sign_algo) {

			fail("%s: cl: got unexpected server signature algorithm: %d/%s\n", name, ret, gnutls_sign_get_name(ret));

			exit(1);

		}

		ret = gnutls_sign_algorithm_get_client(client);

		if (ret != (int)client_sign_algo) {

			fail("%s: cl: got unexpected client signature algorithm: %d/%s\n", name, ret, gnutls_sign_get_name(ret));

			exit(1);

		}

	}

	gnutls_record_send(server, MSG, strlen(MSG));

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

	if (ret == 0) {

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

		exit(1);

	} else if (ret < 0) {

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

		exit(1);

	}

	if (ret != strlen(MSG) || memcmp(MSG, buffer, ret) != 0) {

		fail("client: Error in data received. Expected %d, got %d\n", (int)strlen(MSG), ret);

		exit(1);

	}

	gnutls_bye(client, GNUTLS_SHUT_RDWR);

	gnutls_bye(server, GNUTLS_SHUT_RDWR);

	gnutls_deinit(client);

	gnutls_deinit(server);

	gnutls_certificate_free_credentials(serverx509cred);

	gnutls_certificate_free_credentials(clientx509cred);

	gnutls_anon_free_server_credentials(s_anoncred);

	gnutls_anon_free_client_credentials(c_anoncred);

	gnutls_dh_params_deinit(dh_params);

}

void dtls_try_with_key_mtu(const char *name, const char *client_prio, gnutls_kx_algorithm_t client_kx,

		gnutls_sign_algorithm_t server_sign_algo,

		gnutls_sign_algorithm_t client_sign_algo,

		const gnutls_datum_t *serv_cert,

		const gnutls_datum_t *serv_key,

		const gnutls_datum_t *client_cert,

		const gnutls_datum_t *client_key,

		unsigned cert_flags,

		unsigned smtu)

{

	int ret;

	char buffer[256];

	/* Server stuff. */

	gnutls_certificate_credentials_t serverx509cred;

	gnutls_anon_server_credentials_t s_anoncred;

	gnutls_dh_params_t dh_params;

	const gnutls_datum_t p3 =

	    { (unsigned char *) pkcs3, strlen(pkcs3) };

	gnutls_session_t server;

	int sret = GNUTLS_E_AGAIN;

	/* Client stuff. */

	gnutls_certificate_credentials_t clientx509cred;

	gnutls_anon_client_credentials_t c_anoncred;

	gnutls_session_t client;

	int cret = GNUTLS_E_AGAIN, version;

	/* General init. */

	gnutls_global_set_log_function(tls_log_func);

	if (debug)

		gnutls_global_set_log_level(6);

	reset_buffers();

	/* Init server */

	gnutls_anon_allocate_server_credentials(&s_anoncred);

	gnutls_certificate_allocate_credentials(&serverx509cred);

	ret = gnutls_certificate_set_x509_key_mem(serverx509cred,

					    serv_cert, serv_key,

					    GNUTLS_X509_FMT_PEM);

	if (ret < 0) {

		fail("Could not set key/cert: %s\n", gnutls_strerror(ret));

	}

	gnutls_dh_params_init(&dh_params);

	gnutls_dh_params_import_pkcs3(dh_params, &p3, GNUTLS_X509_FMT_PEM);

	gnutls_certificate_set_dh_params(serverx509cred, dh_params);

	gnutls_anon_set_server_dh_params(s_anoncred, dh_params);

	gnutls_init(&server, GNUTLS_SERVER|GNUTLS_DATAGRAM|GNUTLS_NONBLOCK);

	gnutls_credentials_set(server, GNUTLS_CRD_CERTIFICATE,

				serverx509cred);

	gnutls_credentials_set(server, GNUTLS_CRD_ANON, s_anoncred);

	gnutls_priority_set_direct(server,

				   /*"NORMAL:+ANON-ECDH:+ANON-DH:+ECDHE-RSA:+DHE-RSA:+RSA:+ECDHE-ECDSA:+CURVE-X25519",*/

				   "NORMAL:+ANON-ECDH:+ANON-DH:+ECDHE-RSA:+DHE-RSA:+RSA:+ECDHE-ECDSA:+CURVE-X25519:+SIGN-RSA-PSS-SHA512:+SIGN-RSA-PSS-SHA384:+SIGN-RSA-PSS-SHA256",

				   NULL);

	gnutls_transport_set_push_function(server, server_push);

	gnutls_transport_set_pull_function(server, server_pull);

	gnutls_transport_set_pull_timeout_function(server, server_pull_timeout_func);

	gnutls_transport_set_ptr(server, server);

	if (smtu)

		gnutls_dtls_set_mtu (server, smtu);

	/* Init client */

	ret = gnutls_certificate_allocate_credentials(&clientx509cred);

	if (ret < 0)

		exit(1);

	if (cert_flags == USE_CERT) {

		ret = gnutls_certificate_set_x509_key_mem(clientx509cred,

						    client_cert, client_key,

						    GNUTLS_X509_FMT_PEM);

		if (ret < 0) {

			fail("Could not set key/cert: %s\n", gnutls_strerror(ret));

		}

		gnutls_certificate_server_set_request(server, GNUTLS_CERT_REQUIRE);

	} else if (cert_flags == ASK_CERT) {

		gnutls_certificate_server_set_request(server, GNUTLS_CERT_REQUEST);

	}

#if 0

	ret = gnutls_certificate_set_x509_trust_mem(clientx509cred, &ca_cert, GNUTLS_X509_FMT_PEM);

	if (ret < 0)

		exit(1);

#endif

	ret = gnutls_init(&client, GNUTLS_CLIENT|GNUTLS_DATAGRAM|GNUTLS_NONBLOCK);

	if (ret < 0)

		exit(1);

	gnutls_anon_allocate_client_credentials(&c_anoncred);

	gnutls_credentials_set(client, GNUTLS_CRD_ANON, c_anoncred);

	ret = gnutls_credentials_set(client, GNUTLS_CRD_CERTIFICATE,

				clientx509cred);

	if (ret < 0)

		exit(1);

	gnutls_transport_set_push_function(client, client_push);

	gnutls_transport_set_pull_function(client, client_pull);

	gnutls_transport_set_pull_timeout_function(client, client_pull_timeout_func);

	gnutls_transport_set_ptr(client, client);

	if (smtu)

		gnutls_dtls_set_mtu (client, smtu);

	ret = gnutls_priority_set_direct(client, client_prio, NULL);

	if (ret < 0) {

		exit(1);

	}

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

	HANDSHAKE_DTLS(client, server);

	if (gnutls_kx_get(client) != client_kx) {

		fail("%s: got unexpected key exchange algorithm: %s (expected %s)\n", name, gnutls_kx_get_name(gnutls_kx_get(client)),

			gnutls_kx_get_name(client_kx));

		exit(1);

	}

	/* test signature algorithm match */

	version = gnutls_protocol_get_version(client);

	if (version >= GNUTLS_DTLS1_2) {

		ret = gnutls_sign_algorithm_get(server);

		if (ret != (int)server_sign_algo) {

			fail("%s: got unexpected server signature algorithm: %d/%s\n", name, ret, gnutls_sign_get_name(ret));

			exit(1);

		}

		ret = gnutls_sign_algorithm_get_client(server);

		if (ret != (int)client_sign_algo) {

			fail("%s: got unexpected client signature algorithm: %d/%s\n", name, ret, gnutls_sign_get_name(ret));

			exit(1);

		}

		ret = gnutls_sign_algorithm_get(client);

		if (ret != (int)server_sign_algo) {

			fail("%s: cl: got unexpected server signature algorithm: %d/%s\n", name, ret, gnutls_sign_get_name(ret));

			exit(1);

		}

		ret = gnutls_sign_algorithm_get_client(client);

		if (ret != (int)client_sign_algo) {

			fail("%s: cl: got unexpected client signature algorithm: %d/%s\n", name, ret, gnutls_sign_get_name(ret));

			exit(1);

		}

	}

	gnutls_record_send(server, MSG, strlen(MSG));

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

	if (ret == 0) {

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

		exit(1);

	} else if (ret < 0) {

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

		exit(1);

	}

	if (ret != strlen(MSG) || memcmp(MSG, buffer, ret) != 0) {

		fail("client: Error in data received. Expected %d, got %d\n", (int)strlen(MSG), ret);

		exit(1);

	}

	gnutls_bye(client, GNUTLS_SHUT_RDWR);

	gnutls_bye(server, GNUTLS_SHUT_RDWR);

	gnutls_deinit(client);

	gnutls_deinit(server);

	gnutls_certificate_free_credentials(serverx509cred);

	gnutls_certificate_free_credentials(clientx509cred);

	gnutls_anon_free_server_credentials(s_anoncred);

	gnutls_anon_free_client_credentials(c_anoncred);

	gnutls_dh_params_deinit(dh_params);

}