/*
* Copyright (C) 2004-2012 Free Software Foundation, Inc.
* Copyright (C) 2013 Adam Sampson <ats@offog.org>
* Copyright (C) 2018 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>
#include <stdint.h>
#if defined(_WIN32)
/* socketpair isn't supported on Win32. */
int main(int argc, char **argv)
{
exit(77);
}
#else
#include <string.h>
#include <sys/types.h>
#include <sys/socket.h>
#if !defined(_WIN32)
#include <sys/wait.h>
#endif
#include <unistd.h>
#include <gnutls/gnutls.h>
#include <assert.h>
#include <signal.h>
#include "tls13/ext-parse.h"
#include "utils.h"
/* Tests whether the pre-shared key extension will always be last
* even if the dumbfw extension is present.
*/
const char *side = "";
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"
static void client(int sd, const char *prio)
{
int ret, ii;
gnutls_session_t session;
char buffer[MAX_BUF + 1];
gnutls_psk_client_credentials_t pskcred;
/* Need to enable anonymous KX specifically. */
const gnutls_datum_t key = { (void *) "DEADBEEF", 8 };
global_init();
gnutls_global_set_log_function(tls_log_func);
if (debug)
gnutls_global_set_log_level(6);
side = "client";
gnutls_psk_allocate_client_credentials(&pskcred);
gnutls_psk_set_client_credentials(pskcred, "test", &key,
GNUTLS_PSK_KEY_HEX);
assert(gnutls_init(&session, GNUTLS_CLIENT|GNUTLS_KEY_SHARE_TOP)>=0);
assert(gnutls_priority_set_direct(session, prio, NULL)>=0);
assert(gnutls_credentials_set(session, GNUTLS_CRD_PSK, pskcred)>=0);
gnutls_transport_set_int(session, sd);
/* Perform the TLS handshake
*/
ret = gnutls_handshake(session);
if (ret < 0) {
fail("client: Handshake failed\n");
gnutls_perror(ret);
goto end;
} else {
if (debug)
success("client: Handshake was completed\n");
}
assert(gnutls_record_send(session, MSG, strlen(MSG))>=0);
ret = gnutls_record_recv(session, buffer, MAX_BUF);
if (ret == 0) {
if (debug)
success
("client: Peer has closed the TLS connection\n");
goto end;
} else if (ret < 0) {
fail("client: Error: %s\n", gnutls_strerror(ret));
goto end;
}
if (debug) {
printf("- Received %d bytes: ", ret);
for (ii = 0; ii < ret; ii++) {
fputc(buffer[ii], stdout);
}
fputs("\n", stdout);
}
gnutls_bye(session, GNUTLS_SHUT_RDWR);
end:
close(sd);
gnutls_deinit(session);
gnutls_psk_free_client_credentials(pskcred);
gnutls_global_deinit();
}
static int
pskfunc(gnutls_session_t session, const char *username,
gnutls_datum_t * key)
{
if (debug)
printf("psk: username %s\n", username);
key->data = gnutls_malloc(4);
key->data[0] = 0xDE;
key->data[1] = 0xAD;
key->data[2] = 0xBE;
key->data[3] = 0xEF;
key->size = 4;
return 0;
}
#define EXT_CLIENTHELLO_PADDING 21
#define EXT_PRE_SHARED_KEY 41
struct ctx_st {
unsigned long pos;
void *base;
};
static
void check_ext_pos(void *priv, gnutls_datum_t *msg)
{
struct ctx_st *ctx = priv;
ctx->pos = (ptrdiff_t)((ptrdiff_t)msg->data - (ptrdiff_t)ctx->base);
}
static int client_hello_callback(gnutls_session_t session, unsigned int htype,
unsigned post, unsigned int incoming, const gnutls_datum_t *msg)
{
unsigned long pos_psk;
unsigned long pos_pad;
if (htype == GNUTLS_HANDSHAKE_CLIENT_HELLO && post == GNUTLS_HOOK_POST) {
struct ctx_st ctx;
ctx.base = msg->data;
if (find_client_extension(msg, EXT_CLIENTHELLO_PADDING, &ctx, check_ext_pos) == 0)
fail("Could not find dumbfw/client hello padding extension!\n");
pos_pad = ctx.pos;
ctx.base = msg->data;
if (find_client_extension(msg, EXT_PRE_SHARED_KEY, &ctx, check_ext_pos) == 0)
fail("Could not find psk extension!\n");
pos_psk = ctx.pos;
if (pos_psk < pos_pad) {
fail("The dumbfw extension was sent after pre-shared key!\n");
}
/* check if we are the last extension in general */
if (!is_client_extension_last(msg, EXT_PRE_SHARED_KEY)) {
fail("pre-shared key extension wasn't the last one!\n");
}
}
return 0;
}
static void server(int sd, const char *prio)
{
gnutls_psk_server_credentials_t server_pskcred;
int ret;
gnutls_session_t session;
char buffer[MAX_BUF + 1];
global_init();
gnutls_global_set_log_function(tls_log_func);
if (debug)
gnutls_global_set_log_level(6);
side = "server";
assert(gnutls_psk_allocate_server_credentials(&server_pskcred)>=0);
gnutls_psk_set_server_credentials_function(server_pskcred,
pskfunc);
assert(gnutls_init(&session, GNUTLS_SERVER)>=0);
assert(gnutls_priority_set_direct(session, prio, NULL)>=0);
gnutls_credentials_set(session, GNUTLS_CRD_PSK, server_pskcred);
gnutls_handshake_set_hook_function(session, GNUTLS_HANDSHAKE_ANY,
GNUTLS_HOOK_BOTH,
client_hello_callback);
gnutls_transport_set_int(session, sd);
ret = gnutls_handshake(session);
if (ret < 0) {
close(sd);
gnutls_deinit(session);
fail("server: Handshake has failed (%s)\n\n",
gnutls_strerror(ret));
return;
}
if (debug)
success("server: Handshake was completed\n");
for (;;) {
memset(buffer, 0, MAX_BUF + 1);
gnutls_record_set_timeout(session, 10000);
ret = gnutls_record_recv(session, buffer, MAX_BUF);
if (ret == 0) {
if (debug)
success
("server: Peer has closed the GnuTLS connection\n");
break;
} else if (ret < 0) {
fail("server: Received corrupted data(%d). Closing...\n", ret);
break;
} else if (ret > 0) {
/* echo data back to the client
*/
gnutls_record_send(session, buffer,
strlen(buffer));
}
}
gnutls_bye(session, GNUTLS_SHUT_WR);
close(sd);
gnutls_deinit(session);
gnutls_psk_free_server_credentials(server_pskcred);
gnutls_global_deinit();
if (debug)
success("server: finished\n");
}
static void ch_handler(int sig)
{
int status = 0;
wait(&status);
check_wait_status(status);
return;
}
static
void run_test(const char *prio)
{
pid_t child;
int err;
int sockets[2];
signal(SIGCHLD, ch_handler);
signal(SIGPIPE, SIG_IGN);
success("trying with %s\n", prio);
err = socketpair(AF_UNIX, SOCK_STREAM, 0, sockets);
if (err == -1) {
perror("socketpair");
fail("socketpair failed\n");
return;
}
child = fork();
if (child < 0) {
perror("fork");
fail("fork");
return;
}
if (child) {
int status = 0;
/* parent */
close(sockets[1]);
server(sockets[0], prio);
wait(&status);
check_wait_status(status);
} else {
close(sockets[0]);
client(sockets[1], prio);
exit(0);
}
}
void doit(void)
{
run_test("NORMAL:-VERS-ALL:+VERS-TLS1.3:+VERS-TLS1.2:+PSK:%DUMBFW:-GROUP-ALL:+GROUP-FFDHE2048");
}
#endif /* _WIN32 */