/*
* Copyright (C) 2015 Nikos Mavrogiannopoulos
*
* 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
#include <stdio.h>
#include <stdlib.h>
#include "cert-common.h"
/* This test checks whether an invalid extensions field will lead
* to a GNUTLS_E_UNEXPECTED_EXTENSIONS_LENGTH. */
#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 <signal.h>
#include <assert.h>
#include <gnutls/gnutls.h>
#include "utils.h"
static void terminate(void);
static unsigned reduce = 0;
/* This program tests the client hello verify in DTLS
*/
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);
}
#define RECORD_PAYLOAD_POS 5
#define HANDSHAKE_CS_POS (39)
static ssize_t odd_push(gnutls_transport_ptr_t tr, const void *data, size_t len)
{
uint8_t *d = (void*)data;
int fd = (long)tr;
uint16_t csize, osize;
int pos;
if (d[0] == 22 && d[5] == GNUTLS_HANDSHAKE_CLIENT_HELLO) {
/* skip ciphersuites */
csize = d[RECORD_PAYLOAD_POS+HANDSHAKE_CS_POS+1] + (d[RECORD_PAYLOAD_POS+HANDSHAKE_CS_POS] << 8);
csize += 2;
/* skip compression methods */
osize = d[RECORD_PAYLOAD_POS+HANDSHAKE_CS_POS+csize];
osize += 1;
pos = RECORD_PAYLOAD_POS+HANDSHAKE_CS_POS+csize+osize;
if (reduce) {
if (d[pos+1] != 0x00) {
d[pos+1] = d[pos+1] - 1;
} else {
d[pos] = d[pos] - 1;
d[pos+1] = 0xff;
}
} else {
if (d[pos+1] != 0xff) {
d[pos+1] = d[pos+1] + 1;
} else {
d[pos] = d[pos] + 1;
d[pos+1] = 0x00;
}
}
}
return send(fd, data, len, 0);
}
/* A very basic DTLS client handling DTLS 0.9 which sets premaster secret.
*/
static void client(int fd, const char *prio)
{
int ret;
gnutls_certificate_credentials_t xcred;
gnutls_session_t session;
global_init();
if (debug) {
gnutls_global_set_log_function(client_log_func);
gnutls_global_set_log_level(4711);
}
gnutls_certificate_allocate_credentials(&xcred);
/* Initialize TLS session
*/
gnutls_init(&session, GNUTLS_CLIENT);
gnutls_handshake_set_timeout(session, 20 * 1000);
assert(gnutls_priority_set_direct(session, prio, NULL) >= 0);
gnutls_credentials_set(session, GNUTLS_CRD_CERTIFICATE, xcred);
gnutls_transport_set_int(session, fd);
gnutls_transport_set_push_function(session, odd_push);
/* Perform the TLS handshake
*/
do {
ret = gnutls_handshake(session);
}
while (ret < 0 && gnutls_error_is_fatal(ret) == 0);
if (ret >= 0) {
fail("client: Handshake succeeded!\n");
exit(1);
}
close(fd);
gnutls_deinit(session);
gnutls_certificate_free_credentials(xcred);
gnutls_global_deinit();
}
/* These are global */
pid_t child;
static void terminate(void)
{
int status;
kill(child, SIGTERM);
wait(&status);
exit(1);
}
static void server(int fd, const char *prio)
{
int ret;
gnutls_certificate_credentials_t xcred;
gnutls_session_t session;
/* this must be called once in the program
*/
global_init();
if (debug) {
gnutls_global_set_log_function(server_log_func);
gnutls_global_set_log_level(4711);
}
gnutls_certificate_allocate_credentials(&xcred);
ret = gnutls_certificate_set_x509_key_mem(xcred,
&server_cert, &server_key,
GNUTLS_X509_FMT_PEM);
if (ret < 0)
exit(1);
gnutls_init(&session, GNUTLS_SERVER);
gnutls_handshake_set_timeout(session, 20 * 1000);
/* avoid calling all the priority functions, since the defaults
* are adequate.
*/
assert(gnutls_priority_set_direct(session, prio, NULL) >= 0);
gnutls_credentials_set(session, GNUTLS_CRD_CERTIFICATE, xcred);
gnutls_transport_set_int(session, fd);
do {
ret = gnutls_handshake(session);
}
while (ret < 0 && gnutls_error_is_fatal(ret) == 0);
if (ret != GNUTLS_E_UNEXPECTED_EXTENSIONS_LENGTH) {
close(fd);
gnutls_deinit(session);
fail("server: Handshake did not fail with GNUTLS_E_UNEXPECTED_EXTENSIONS_LENGTH (%s)\n\n",
gnutls_strerror(ret));
terminate();
}
close(fd);
gnutls_deinit(session);
gnutls_certificate_free_credentials(xcred);
gnutls_global_deinit();
if (debug)
success("server: Handshake failed as expected\n");
}
static void start(const char *prio)
{
int fd[2];
int ret;
success("trying %s\n", prio);
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) {
int status;
/* parent */
close(fd[0]);
server(fd[1], prio);
wait(&status);
check_wait_status(status);
close(fd[1]);
} else {
close(fd[1]);
client(fd[0], prio);
exit(0);
}
}
void doit(void)
{
success("checking overflow\n");
start("NORMAL:-VERS-ALL:+VERS-TLS1.2");
start("NORMAL:-VERS-ALL:+VERS-TLS1.3");
start("NORMAL");
success("checking underflow\n");
reduce = 1;
start("NORMAL:-VERS-ALL:+VERS-TLS1.2");
start("NORMAL:-VERS-ALL:+VERS-TLS1.3");
start("NORMAL");
}
#endif /* _WIN32 */