/*
* Copyright (C) 2013-2015 Nikos Mavrogiannopoulos
* Copyright (C) 2015 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 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>
/* This checks the proper behavior of the client when
* invalid data are sent by the server in the hello verify
* request.
*/
#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 <sys/select.h>
#include <errno.h>
#include <signal.h>
#include <gnutls/gnutls.h>
#include <gnutls/dtls.h>
#include "utils.h"
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 MAX_BUF 1024
static ssize_t
push(gnutls_transport_ptr_t tr, const void *data, size_t len)
{
int fd = (long int) tr;
return send(fd, data, len, 0);
}
static void client(int fd)
{
int ret;
gnutls_anon_client_credentials_t anoncred;
gnutls_session_t session;
/* Need to enable anonymous KX specifically. */
global_init();
if (debug) {
gnutls_global_set_log_function(client_log_func);
gnutls_global_set_log_level(4711);
}
gnutls_anon_allocate_client_credentials(&anoncred);
/* Initialize TLS session
*/
gnutls_init(&session, GNUTLS_CLIENT | GNUTLS_DATAGRAM);
gnutls_dtls_set_mtu(session, 1500);
gnutls_handshake_set_timeout(session, 20 * 1000);
/* Use default priorities */
gnutls_priority_set_direct(session,
"NONE:+VERS-DTLS-ALL:+CIPHER-ALL:+MAC-ALL:+SIGN-ALL:+COMP-ALL:+ANON-ECDH:+CURVE-ALL",
NULL);
/* put the anonymous credentials to the current session
*/
gnutls_credentials_set(session, GNUTLS_CRD_ANON, anoncred);
gnutls_transport_set_int(session, fd);
gnutls_transport_set_push_function(session, push);
/* Perform the TLS handshake
*/
do {
ret = gnutls_handshake(session);
}
while (ret < 0 && gnutls_error_is_fatal(ret) == 0);
if (ret < 0) {
success("client: Handshake failed as expected\n");
gnutls_perror(ret);
goto exit;
} else {
fail("client: Handshake completed unexpectedly\n");
goto exit;
}
exit:
gnutls_deinit(session);
gnutls_anon_free_client_credentials(anoncred);
gnutls_global_deinit();
}
/* These are global */
pid_t child;
#define CLI_ADDR (void*)"test"
#define CLI_ADDR_LEN 4
static
ssize_t recv_timeout(int sockfd, void *buf, size_t len, unsigned flags, unsigned sec)
{
int ret;
struct timeval tv;
fd_set set;
tv.tv_sec = sec;
tv.tv_usec = 0;
FD_ZERO(&set);
FD_SET(sockfd, &set);
do {
ret = select(sockfd + 1, &set, NULL, NULL, &tv);
} while (ret == -1 && errno == EINTR);
if (ret == -1 || ret == 0) {
errno = ETIMEDOUT;
return -1;
}
return recv(sockfd, buf, len, flags);
}
#define SERV_TIMEOUT 30
static void server(int fd)
{
int ret, csend = 0;
gnutls_anon_server_credentials_t anoncred;
char buffer[MAX_BUF + 1];
gnutls_datum_t cookie_key;
gnutls_dtls_prestate_st prestate;
gnutls_session_t session;
unsigned try = 0;
/* 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);
}
ret = gnutls_key_generate(&cookie_key, GNUTLS_COOKIE_KEY_SIZE);
if (ret < 0) {
fail("Cannot generate key: %s\n", gnutls_strerror(ret));
exit(1);
}
gnutls_anon_allocate_server_credentials(&anoncred);
gnutls_init(&session, GNUTLS_SERVER | GNUTLS_DATAGRAM);
gnutls_handshake_set_timeout(session, SERV_TIMEOUT * 1000);
gnutls_dtls_set_mtu(session, 1500);
/* avoid calling all the priority functions, since the defaults
* are adequate.
*/
gnutls_priority_set_direct(session,
"NONE:+VERS-DTLS1.0:+CIPHER-ALL:+MAC-ALL:+SIGN-ALL:+COMP-ALL:+ANON-ECDH:+CURVE-ALL",
NULL);
gnutls_credentials_set(session, GNUTLS_CRD_ANON, anoncred);
gnutls_transport_set_int(session, fd);
gnutls_transport_set_push_function(session, push);
for (;;) {
ret = recv_timeout(fd, buffer, sizeof(buffer), MSG_PEEK, SERV_TIMEOUT);
if (ret < 0) {
if (try != 0) {
success("Server was terminated as expected!\n");
goto exit;
} else {
fail("Error receiving first message\n");
exit(1);
}
}
try++;
memset(&prestate, 0, sizeof(prestate));
prestate.record_seq = 105791312;
prestate.hsk_write_seq = 67166359;
ret =
gnutls_dtls_cookie_verify(&cookie_key, CLI_ADDR,
CLI_ADDR_LEN, buffer, ret,
&prestate);
if (ret < 0) { /* cookie not valid */
if (debug)
success("Sending hello verify request\n");
ret =
gnutls_dtls_cookie_send(&cookie_key, CLI_ADDR,
CLI_ADDR_LEN,
&prestate,
(gnutls_transport_ptr_t)
(long) fd, push);
if (ret < 0) {
fail("Cannot send data\n");
exit(1);
}
/* discard peeked data */
recv_timeout(fd, buffer, sizeof(buffer), 0, SERV_TIMEOUT);
csend++;
if (csend > 2) {
fail("too many cookies sent\n");
exit(1);
}
continue;
}
/* success */
break;
}
fail("Shouldn't have reached here\n");
exit(1);
exit:
gnutls_deinit(session);
gnutls_free(cookie_key.data);
gnutls_anon_free_server_credentials(anoncred);
gnutls_global_deinit();
}
void doit(void)
{
int fd[2];
int ret;
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 */
client(fd[0]);
wait(&status);
check_wait_status(status);
} else {
close(fd[0]);
server(fd[1]);
exit(0);
}
}
#endif /* _WIN32 */