/*

 * Copyright (C) 2015-2019 Red Hat, Inc.

 *

 * 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 <assert.h>

#include <stdio.h>

#include <stdlib.h>

#if !defined(__linux__) || !defined(__GNUC__)

int main(int argc, char **argv)

{

	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/crypto.h>

#include "cert-common.h"

#include "utils.h"

#include "virt-time.h"

static void terminate(void);

#define SESSIONS 2

#define MAX_BUF 5*1024

#define MSG "Hello TLS"

extern unsigned int _gnutls_global_version;

/* This program tests whether the gnutls_prf() works as

 * expected.

 */

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);

}

/* These are global */

static pid_t child;

static const

gnutls_datum_t hrnd = {(void*)"\x00\x02\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00", 32};

static const

gnutls_datum_t hsrnd = {(void*)"\x00\x05\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00", 32};

static int gnutls_rnd_works;

int __attribute__ ((visibility ("protected")))

gnutls_rnd(gnutls_rnd_level_t level, void *data, size_t len)

{

	gnutls_rnd_works = 1;

	memset(data, 0xff, len);

	/* Flip the first byte to avoid infinite loop in the RSA

	 * blinding code of Nettle */

	if (len > 0)

		memset(data, 0x0, 1);

	return 0;

}

static gnutls_datum_t session_ticket_key = { NULL, 0 };

static void dump(const char *name, const uint8_t *data, unsigned data_size)

{

	unsigned i;

	fprintf(stderr, "%s", name);

	for (i=0;i

		fprintf(stderr, "\\x%.2x", (unsigned)data[i]);

	fprintf(stderr, "\n");

}

#define TRY(label_size, label, extra_size, extra, size, exp) \

	{ \

	ret = gnutls_prf_early(session, label_size, label, extra_size, extra, size, \

			 (void*)key_material); \

	if (ret < 0) { \

		fprintf(stderr, "gnutls_prf_early: error in %d\n", __LINE__); \

		gnutls_perror(ret); \

		exit(1); \

	} \

	if (memcmp(key_material, exp, size) != 0) { \

		fprintf(stderr, "gnutls_prf_early: output doesn't match for '%s'\n", label); \

		dump("got ", key_material, size); \

		dump("expected ", exp, size); \

		exit(1); \

	} \

	}

#define KEY_EXP_VALUE "\xc1\x6b\x6c\xb9\x88\x33\xd5\x28\x80\xec\x27\x87\xa2\x6f\x4b\xd0\x01\x5e\x7f\xca\xd7\xd4\x8a\x3f\xe2\x48\x92\xef\x02\x14\xfb\x81\x90\x04"

#define HELLO_VALUE "\x2a\x73\xd9\x74\x04\x4e\x0a\x5f\x41\x8a\x09\xcb\x45\x33\x1a\xec\xd3\xfc\xdc\x1b\x2c\x67\x26\xe4\x9c\xfe\x1f\xa5\x74\xf1\x4f"

#define CONTEXT_VALUE "\x87\xf6\x88\xe3\xd7\xf2\x05\xbc\xa4\x10\xa3\x48\x9f\xf5\xcf\x97\x06\x22\x4e\xfd\x18\x32\x52\x1d\xbd\x26\xf5\x5b\x21\x20\xec"

#define NULL_CONTEXT_VALUE "\xf9\xca\xfe\x45\x44\x96\xdb\xc5\x41\x8f\x7e\x8e\xd7\xb0\x7d\x19\x45\xaf\x09\xbc\x1e\x82\x94\xac\x55\xe5\xb9\xb4\x3b\xe8\xc0"

static int handshake_callback_called;

static int handshake_callback(gnutls_session_t session, unsigned int htype,

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

{

	unsigned char key_material[512];

	int ret;

	assert(post == GNUTLS_HOOK_POST);

	handshake_callback_called++;

	TRY(13, "key expansion", 0, NULL, 34, (uint8_t*)KEY_EXP_VALUE);

	TRY(6, "hello", 0, NULL, 31, (uint8_t*)HELLO_VALUE);

	TRY(7, "context", 5, "abcd\xfa", 31, (uint8_t*)CONTEXT_VALUE);

	TRY(12, "null-context", 0, "", 31, (uint8_t*)NULL_CONTEXT_VALUE);

	return 0;

}

static void client(int sds[])

{

	gnutls_session_t session;

	int ret, ii;

	gnutls_certificate_credentials_t clientx509cred;

	const char *err;

	int t;

	gnutls_datum_t session_data = {NULL, 0};

	char buffer[MAX_BUF + 1];

	global_init();

	virt_time_init();

	if (debug) {

		gnutls_global_set_log_function(client_log_func);

		gnutls_global_set_log_level(4711);

	}

	gnutls_certificate_allocate_credentials(&clientx509cred);

	for (t = 0; t < SESSIONS; t++) {

		/* Initialize TLS session

		 */

		gnutls_init(&session, GNUTLS_CLIENT);

		/* Use default priorities */

		ret = gnutls_priority_set_direct(session,

						 "NONE:+VERS-TLS1.3:+AES-256-GCM:+AEAD:+SIGN-RSA-PSS-RSAE-SHA384:+GROUP-SECP256R1",

						 &err;;

		if (ret < 0) {

			fail("client: priority set failed (%s): %s\n",

			     gnutls_strerror(ret), err);

			exit(1);

		}

		ret = gnutls_credentials_set(session, GNUTLS_CRD_CERTIFICATE,

					     clientx509cred);

		if (ret < 0)

			exit(1);

		gnutls_handshake_set_random(session, &hrnd);

		gnutls_transport_set_int(session, sds[t]);

		if (t > 0) {

			gnutls_session_set_data(session, session_data.data,

						session_data.size);

			gnutls_handshake_set_hook_function(session, GNUTLS_HANDSHAKE_CLIENT_HELLO,

							   GNUTLS_HOOK_POST,

							   handshake_callback);

		}

		/* 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: %s\n", strerror(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)));

		ret = gnutls_cipher_get(session);

		if (ret != GNUTLS_CIPHER_AES_256_GCM) {

			fprintf(stderr, "negotiated unexpected cipher: %s\n", gnutls_cipher_get_name(ret));

			exit(1);

		}

		ret = gnutls_mac_get(session);

		if (ret != GNUTLS_MAC_AEAD) {

			fprintf(stderr, "negotiated unexpected mac: %s\n", gnutls_mac_get_name(ret));

			exit(1);

		}

		if (t == 0) {

			/* get the session data size */

			ret =

			    gnutls_session_get_data2(session,

						     &session_data);

			if (ret < 0)

				fail("Getting resume data failed\n");

			if (handshake_callback_called != 0)

				fail("client: handshake callback is called\n");

		} else {

			if (handshake_callback_called != t)

				fail("client: handshake callback is not called\n");

		}

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

		do {

			ret = gnutls_record_recv(session, buffer, MAX_BUF);

		} while (ret == GNUTLS_E_AGAIN);

		if (ret == 0) {

			if (debug)

				success

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

		} else if (ret < 0) {

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

		}

		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_WR);

		close(sds[t]);

		gnutls_deinit(session);

	}

	gnutls_free(session_data.data);

	gnutls_certificate_free_credentials(clientx509cred);

	gnutls_global_deinit();

}

static void terminate(void)

{

	int status = 0;

	kill(child, SIGTERM);

	wait(&status);

	exit(1);

}

static void server(int sds[])

{

	int ret;

	gnutls_session_t session;

	gnutls_certificate_credentials_t serverx509cred;

	int t;

	char buffer[MAX_BUF + 1];

	/* this must be called once in the program

	 */

	global_init();

	virt_time_init();

	if (debug) {

		gnutls_global_set_log_function(server_log_func);

		gnutls_global_set_log_level(4711);

	}

	gnutls_certificate_allocate_credentials(&serverx509cred);

	gnutls_session_ticket_key_generate(&session_ticket_key);

	for (t = 0; t < SESSIONS; t++) {

		gnutls_init(&session, GNUTLS_SERVER);

		gnutls_session_ticket_enable_server(session,

						    &session_ticket_key);

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

		 * are adequate.

		 */

		ret = gnutls_priority_set_direct(session,

						 "NORMAL:-VERS-ALL:+VERS-TLS1.3:-KX-ALL:-SIGN-ALL:+SIGN-RSA-PSS-RSAE-SHA384:-GROUP-ALL:+GROUP-SECP256R1", NULL);

		if (ret < 0) {

			fail("server: priority set failed (%s)\n\n",

			     gnutls_strerror(ret));

			terminate();

		}

		gnutls_certificate_set_x509_key_mem(serverx509cred,

						    &server_cert, &server_key,

						    GNUTLS_X509_FMT_PEM);

		gnutls_credentials_set(session, GNUTLS_CRD_CERTIFICATE,

				       serverx509cred);

		gnutls_handshake_set_random(session, &hsrnd);

		gnutls_transport_set_int(session, sds[t]);

		if (t > 0) {

			if (!gnutls_rnd_works) {

				fprintf(stderr, "gnutls_rnd() could not be overridden, skipping prf checks see #584\n");

				exit(77);

			} else {

				gnutls_handshake_set_hook_function(session, GNUTLS_HANDSHAKE_CLIENT_HELLO,

								   GNUTLS_HOOK_POST,

								   handshake_callback);

			}

		}

		do {

			ret = gnutls_handshake(session);

		}

		while (ret < 0 && gnutls_error_is_fatal(ret) == 0);

		if (ret < 0) {

			close(sds[t]);

			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)));

		if (t == 0) {

			if (handshake_callback_called != 0)

				fail("server: handshake callback is called\n");

		} else {

			if (handshake_callback_called != t)

				fail("server: handshake callback is not called\n");

		}

		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) {

				kill(child, SIGTERM);

				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(sds[t]);

		gnutls_deinit(session);

	}

	gnutls_certificate_free_credentials(serverx509cred);

	gnutls_free(session_ticket_key.data);

	session_ticket_key.data = NULL;

	gnutls_global_deinit();

	if (debug)

		success("server: finished\n");

}

void doit(void)

{

	int client_sds[SESSIONS], server_sds[SESSIONS];

	int i;

	int ret;

	_gnutls_global_version = 0x030607;

	signal(SIGPIPE, SIG_IGN);

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

		int sockets[2];

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

		if (ret == -1) {

			perror("socketpair");

			fail("socketpair failed\n");

			return;

		}

		server_sds[i] = sockets[0];

		client_sds[i] = sockets[1];

	}

	child = fork();

	if (child < 0) {

		perror("fork");

		fail("fork");

		exit(1);

	}

	if (child) {

		int status = 0;

		/* parent */

		for (i = 0; i < SESSIONS; i++)

			close(client_sds[i]);

		server(server_sds);

		wait(&status);

		check_wait_status(status);

	} else {

		for (i = 0; i < SESSIONS; i++)

			close(server_sds[i]);

		client(client_sds);

		exit(0);

	}

}

#endif				/* _WIN32 */