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/*
* 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);
}
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