/*

 * Copyright (C) 2017-2019 Red Hat, Inc.

 *

 * Author: 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 <stdbool.h>

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#include <errno.h>

#include <gnutls/gnutls.h>

#include <gnutls/crypto.h>

#include <assert.h>

#include "cert-common.h"

#include "utils.h"

#include "virt-time.h"

#define RANDOMIZE

#include "eagain-common.h"

const char *side = "";

/* This program tests whether multiple key update messages are handled

 * properly with rate-limit. */

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

{

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

}

#define MAX_BUF 1024

#define MSG "Hello TLS, and hi and how are you and more data here... and more... and even more and even more more data..."

/* These must match the definitions in lib/tls13/key_update.c. */

#define KEY_UPDATES_WINDOW 1000

#define KEY_UPDATES_PER_WINDOW 8

static unsigned key_update_msg_inc = 0;

static unsigned key_update_msg_out = 0;

static int hsk_callback(gnutls_session_t session, unsigned int htype,

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

{

	assert(post == GNUTLS_HOOK_PRE);

	assert(msg->size == 1);

	if (htype == GNUTLS_HANDSHAKE_KEY_UPDATE) {

		if (incoming)

			key_update_msg_inc++;

		else

			key_update_msg_out++;

	}

	return 0;

}

static void run(const char *name, bool exceed_limit)

{

	/* Server stuff. */

	gnutls_certificate_credentials_t ccred;

	gnutls_certificate_credentials_t scred;

	gnutls_session_t server;

	int sret, cret;

	/* Client stuff. */

	gnutls_session_t client;

	/* Need to enable anonymous KX specifically. */

	char buffer[MAX_BUF + 1];

	int ret, transferred = 0;

	size_t i;

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

	/* General init. */

	global_init();

	gnutls_global_set_log_function(tls_log_func);

	if (debug)

		gnutls_global_set_log_level(9);

	/* Init server */

	assert(gnutls_certificate_allocate_credentials(&scred) >= 0);

	assert(gnutls_certificate_set_x509_key_mem(scred,

						   &server_ca3_localhost_cert,

						   &server_ca3_key,

						   GNUTLS_X509_FMT_PEM) >= 0);

	assert(gnutls_init(&server, GNUTLS_SERVER) >= 0);

	ret =

	    gnutls_priority_set_direct(server,

				       "NORMAL:-VERS-TLS-ALL:+VERS-TLS1.3",

				       NULL);

	if (ret < 0)

		exit(1);

	gnutls_credentials_set(server, GNUTLS_CRD_CERTIFICATE, scred);

	gnutls_transport_set_push_function(server, server_push);

	gnutls_transport_set_pull_function(server, server_pull);

	gnutls_transport_set_ptr(server, server);

	/* Init client */

	assert(gnutls_certificate_allocate_credentials(&ccred) >= 0);

	assert(gnutls_certificate_set_x509_trust_mem

	       (ccred, &ca3_cert, GNUTLS_X509_FMT_PEM) >= 0);

	gnutls_init(&client, GNUTLS_CLIENT);

	ret =

	    gnutls_priority_set_direct(client,

				       "NORMAL:-VERS-TLS-ALL:+VERS-TLS1.3",

				       NULL);

	assert(ret >= 0);

	ret = gnutls_credentials_set(client, GNUTLS_CRD_CERTIFICATE, ccred);

	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);

	HANDSHAKE(client, server);

	if (debug)

		success("Handshake established\n");

	key_update_msg_inc = 0;

	key_update_msg_out = 0;

	gnutls_handshake_set_hook_function(client, -1, GNUTLS_HOOK_PRE, hsk_callback);

	/* schedule multiple key updates */

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

		do {

			ret = gnutls_session_key_update(client, 1);

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

		if (ret < 0)

			fail("error in key update: %s\n", gnutls_strerror(ret));

	}

	/* server receives the client key update and sends data */

	TRANSFER(client, server, MSG, strlen(MSG), buffer, MAX_BUF);

	TRANSFER(server, client, MSG, strlen(MSG), buffer, MAX_BUF);

	EMPTY_BUF(server, client, buffer, MAX_BUF);

	if (key_update_msg_out != KEY_UPDATES_PER_WINDOW)

		fail("unexpected number of key updates are sent: %d\n",

			key_update_msg_out);

	else {

		if (debug)

			success("successfully sent %d key updates\n",

				KEY_UPDATES_PER_WINDOW);

	}

	if (key_update_msg_inc != 1)

		fail("unexpected number of key updates received: %d\n",

			key_update_msg_inc);

	else {

		if (debug)

			success("successfully received 1 key update\n");

	}

	if (exceed_limit) {

		/* excessive key update in the same time window should

		 * be rejected by the peer */

		do {

			ret = gnutls_session_key_update(client, 1);

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

		/* server receives the client key update and sends data */

		ret = record_send_loop(client, MSG, strlen(MSG), 0);

		assert(ret == strlen(MSG));

		ret = gnutls_record_recv(server, buffer, MAX_BUF);

		if (ret != GNUTLS_E_TOO_MANY_HANDSHAKE_PACKETS)

			fail("server didn't reject excessive number of key updates\n");

		else {

			if (debug)

				success("server rejected excessive number of key updates\n");

		}

	} else {

		virt_sec_sleep(KEY_UPDATES_WINDOW / 1000 + 1);

		/* the time window should be rolled over now */

		do {

			ret = gnutls_session_key_update(client, 1);

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

		if (ret < 0)

			fail("error in key update: %s\n", gnutls_strerror(ret));

		/* server receives the client key update and sends data */

		TRANSFER(client, server, MSG, strlen(MSG), buffer, MAX_BUF);

		TRANSFER(server, client, MSG, strlen(MSG), buffer, MAX_BUF);

		EMPTY_BUF(server, client, buffer, MAX_BUF);

	}

	gnutls_bye(client, GNUTLS_SHUT_WR);

	gnutls_bye(server, GNUTLS_SHUT_WR);

	gnutls_deinit(client);

	gnutls_deinit(server);

	gnutls_certificate_free_credentials(scred);

	gnutls_certificate_free_credentials(ccred);

	gnutls_global_deinit();

	reset_buffers();

}

void doit(void)

{

	virt_time_init();

	run("not exceeding limit", 0);

	run("exceeding limit", 1);

}