/*
* Copyright (C) 2017 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 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 <stdio.h>
#include <stdlib.h>
#if defined(_WIN32)
int main()
{
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/dtls.h>
#include <signal.h>
#include <assert.h>
#include <errno.h>
#include "cert-common.h"
#include "utils.h"
/* This program tests whether the ChangeCipherSpec message
* is ignored during handshake.
*/
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);
}
static unsigned client_sent_ccs = 0;
static unsigned server_sent_ccs = 0;
static int cli_hsk_callback(gnutls_session_t session, unsigned int htype,
unsigned post, unsigned int incoming, const gnutls_datum_t *msg);
static void client(int fd, unsigned ccs_check)
{
int ret;
gnutls_certificate_credentials_t x509_cred;
gnutls_session_t session;
char buf[64];
global_init();
client_sent_ccs = 0;
server_sent_ccs = 0;
if (debug) {
gnutls_global_set_log_function(client_log_func);
gnutls_global_set_log_level(7);
}
gnutls_certificate_allocate_credentials(&x509_cred);
/* Initialize TLS session
*/
gnutls_init(&session, GNUTLS_CLIENT|GNUTLS_POST_HANDSHAKE_AUTH);
gnutls_session_set_ptr(session, &ccs_check);
gnutls_handshake_set_timeout(session, 20 * 1000);
if (ccs_check) {
gnutls_handshake_set_hook_function(session, GNUTLS_HANDSHAKE_ANY,
GNUTLS_HOOK_PRE,
cli_hsk_callback);
}
ret = gnutls_priority_set_direct(session, "NORMAL:-VERS-ALL:+VERS-TLS1.3:+VERS-TLS1.2:+VERS-TLS1.0", NULL);
if (ret < 0)
fail("cannot set TLS 1.3 priorities\n");
gnutls_certificate_set_x509_key_mem(x509_cred, &cli_ca3_cert,
&cli_ca3_key,
GNUTLS_X509_FMT_PEM);
/* put the anonymous credentials to the current session
*/
gnutls_credentials_set(session, GNUTLS_CRD_CERTIFICATE, x509_cred);
gnutls_transport_set_int(session, fd);
/* Perform the TLS handshake
*/
do {
ret = gnutls_handshake(session);
}
while (ret < 0 && gnutls_error_is_fatal(ret) == 0);
if (ret != 0)
fail("handshake failed: %s\n", gnutls_strerror(ret));
success("client handshake completed\n");
do {
ret = gnutls_record_recv(session, buf, sizeof(buf));
} while (ret == GNUTLS_E_AGAIN || ret == GNUTLS_E_INTERRUPTED);
if (ret < 0)
fail("client: recv did not succeed as expected: %s\n", gnutls_strerror(ret));
/* send change cipher spec, this should fail in the server */
do {
ret = send(fd, "\x14\x03\x03\x00\x01\x01", 6, 0);
} while(ret == -1 && (errno == EINTR || errno == EAGAIN));
close(fd);
gnutls_deinit(session);
if (ccs_check) {
if (client_sent_ccs != 1) {
fail("client: did not sent CCS\n");
}
}
gnutls_certificate_free_credentials(x509_cred);
gnutls_global_deinit();
}
static int cli_hsk_callback(gnutls_session_t session, unsigned int htype,
unsigned post, unsigned int incoming, const gnutls_datum_t *msg)
{
unsigned *p;
unsigned ccs_check;
static unsigned hello_received = 0;
p = gnutls_session_get_ptr(session);
ccs_check = *p;
assert(ccs_check != 0);
assert(post == GNUTLS_HOOK_PRE);
if (htype == GNUTLS_HANDSHAKE_CLIENT_HELLO && !incoming) {
hello_received = 1;
gnutls_handshake_set_hook_function(session, GNUTLS_HANDSHAKE_CHANGE_CIPHER_SPEC,
GNUTLS_HOOK_PRE,
cli_hsk_callback);
}
if (htype == GNUTLS_HANDSHAKE_CHANGE_CIPHER_SPEC && !incoming && hello_received) {
client_sent_ccs++;
assert(msg->size == 1 && msg->data[0] == 0x01);
}
return 0;
}
static int hsk_callback(gnutls_session_t session, unsigned int htype,
unsigned post, unsigned int incoming, const gnutls_datum_t *msg)
{
int ret;
int fd;
unsigned *p;
unsigned ccs_check;
p = gnutls_session_get_ptr(session);
ccs_check = *p;
assert(post == GNUTLS_HOOK_PRE);
if (!ccs_check) {
if (!incoming || htype == GNUTLS_HANDSHAKE_CLIENT_HELLO ||
htype == GNUTLS_HANDSHAKE_FINISHED)
return 0;
fd = gnutls_transport_get_int(session);
/* send change cipher spec */
do {
ret = send(fd, "\x14\x03\x03\x00\x01\x01", 6, 0);
} while(ret == -1 && (errno == EINTR || errno == EAGAIN));
} else { /* checking whether server received it */
if (htype == GNUTLS_HANDSHAKE_CHANGE_CIPHER_SPEC && !incoming) {
server_sent_ccs++;
assert(msg->size == 1 && msg->data[0] == 0x01);
}
}
return 0;
}
static void server(int fd, unsigned ccs_check)
{
int ret;
gnutls_session_t session;
gnutls_certificate_credentials_t x509_cred;
char buf[64];
/* this must be called once in the program
*/
global_init();
client_sent_ccs = 0;
server_sent_ccs = 0;
if (debug) {
gnutls_global_set_log_function(server_log_func);
gnutls_global_set_log_level(4711);
}
gnutls_certificate_allocate_credentials(&x509_cred);
gnutls_certificate_set_x509_key_mem(x509_cred, &server_cert,
&server_key,
GNUTLS_X509_FMT_PEM);
gnutls_init(&session, GNUTLS_SERVER);
gnutls_handshake_set_timeout(session, 20 * 1000);
if (ccs_check)
gnutls_handshake_set_hook_function(session, GNUTLS_HANDSHAKE_CHANGE_CIPHER_SPEC,
GNUTLS_HOOK_PRE,
hsk_callback);
else
gnutls_handshake_set_hook_function(session, GNUTLS_HANDSHAKE_ANY,
GNUTLS_HOOK_PRE,
hsk_callback);
/* avoid calling all the priority functions, since the defaults
* are adequate.
*/
assert(gnutls_priority_set_direct(session, "NORMAL:+VERS-TLS1.3", NULL) >= 0);
gnutls_session_set_ptr(session, &ccs_check);
gnutls_credentials_set(session, GNUTLS_CRD_CERTIFICATE, x509_cred);
gnutls_transport_set_int(session, fd);
do {
ret = gnutls_handshake(session);
} while (ret < 0 && gnutls_error_is_fatal(ret) == 0);
if (ret != 0)
fail("handshake failed: %s\n", gnutls_strerror(ret));
success("server handshake completed\n");
gnutls_certificate_server_set_request(session, GNUTLS_CERT_REQUIRE);
/* ask peer for re-authentication */
do {
ret = gnutls_record_send(session, "\x00", 1);
} while (ret == GNUTLS_E_AGAIN || ret == GNUTLS_E_INTERRUPTED);
if (ret < 0)
fail("server: gnutls_record_send did not succeed as expected: %s\n", gnutls_strerror(ret));
/* receive CCS and fail */
do {
ret = gnutls_record_recv(session, buf, sizeof(buf));
} while (ret == GNUTLS_E_AGAIN || ret == GNUTLS_E_INTERRUPTED);
if (ret != GNUTLS_E_UNEXPECTED_PACKET)
fail("server: incorrect alert sent: %d != %d\n",
ret, GNUTLS_E_UNEXPECTED_PACKET);
close(fd);
gnutls_deinit(session);
gnutls_certificate_free_credentials(x509_cred);
if (ccs_check) {
if (server_sent_ccs != 1) {
fail("server: did not sent CCS\n");
}
}
gnutls_global_deinit();
if (debug)
success("server: client/server hello were verified\n");
}
static void ch_handler(int sig)
{
int status;
wait(&status);
check_wait_status(status);
return;
}
static
void start(unsigned ccs_check)
{
int fd[2];
int ret;
pid_t child;
signal(SIGCHLD, ch_handler);
signal(SIGPIPE, SIG_IGN);
ret = socketpair(AF_UNIX, SOCK_STREAM, 0, fd);
if (ret < 0) {
perror("socketpair");
exit(1);
}
child = fork();
if (child < 0) {
perror("fork");
fail("fork");
exit(1);
}
if (child) {
/* parent */
close(fd[1]);
server(fd[0], ccs_check);
kill(child, SIGTERM);
} else {
close(fd[0]);
client(fd[1], ccs_check);
exit(0);
}
}
void doit(void)
{
start(0);
start(1);
}
#endif /* _WIN32 */