/*
* Copyright (C) 2004-2012 Free Software Foundation, Inc.
* Copyright (C) 2013 Adam Sampson <ats@offog.org>
*
* Author: Simon Josefsson
*
* 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
*/
/* Parts copied from GnuTLS example programs. */
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.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 <signal.h>
#include <assert.h>
#include <gnutls/gnutls.h>
#include "utils.h"
/* A very basic TLS client, with PSK authentication.
*/
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, const char *user, const gnutls_datum_t *key,
unsigned expect_hint, int expect_fail, int exp_kx)
{
int ret, ii, kx;
gnutls_session_t session;
char buffer[MAX_BUF + 1];
gnutls_psk_client_credentials_t pskcred;
const char *hint;
global_init();
gnutls_global_set_log_function(tls_log_func);
if (debug)
gnutls_global_set_log_level(4711);
side = "client";
gnutls_psk_allocate_client_credentials(&pskcred);
gnutls_psk_set_client_credentials(pskcred, user, 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);
/* put the anonymous credentials to the current session
*/
gnutls_credentials_set(session, GNUTLS_CRD_PSK, pskcred);
gnutls_transport_set_int(session, sd);
/* Perform the TLS handshake
*/
ret = gnutls_handshake(session);
if (ret < 0) {
if (!expect_fail)
fail("client: Handshake failed\n");
if (ret != expect_fail) {
fail("expected cli error %d (%s), got %d (%s)\n", expect_fail, gnutls_strerror(expect_fail),
ret, gnutls_strerror(ret));
}
goto end;
} else {
if (debug)
success("client: Handshake was completed\n");
}
/* check the hint */
if (expect_hint) {
hint = gnutls_psk_client_get_hint(session);
if (hint == NULL || strcmp(hint, "hint") != 0) {
fail("client: hint is not the expected: %s\n", gnutls_psk_client_get_hint(session));
goto end;
}
}
gnutls_record_send(session, MSG, strlen(MSG));
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;
}
kx = gnutls_kx_get(session);
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);
if (expect_fail)
fail("client: expected failure but connection succeeded!\n");
if (exp_kx && kx != exp_kx) {
fail("client: expected key exchange %s, but got %s\n",
gnutls_kx_get_name(exp_kx),
gnutls_kx_get_name(kx));
}
end:
close(sd);
gnutls_deinit(session);
gnutls_psk_free_client_credentials(pskcred);
gnutls_global_deinit();
}
/* This is a sample TLS 1.0 echo server, for PSK authentication.
*/
#define MAX_BUF 1024
static void server(int sd, const char *prio, const char *user, bool no_cred,
int expect_fail, int exp_kx)
{
gnutls_psk_server_credentials_t server_pskcred;
int ret, kx;
gnutls_session_t session;
const char *pskid;
char buffer[MAX_BUF + 1];
char *psk_file = getenv("PSK_FILE");
char *desc;
/* this must be called once in the program
*/
global_init();
gnutls_global_set_log_function(tls_log_func);
if (debug)
gnutls_global_set_log_level(4711);
side = "server";
if (psk_file == NULL)
psk_file = (char*)"psk.passwd";
gnutls_psk_allocate_server_credentials(&server_pskcred);
gnutls_psk_set_server_credentials_hint(server_pskcred, "hint");
ret = gnutls_psk_set_server_credentials_file(server_pskcred, psk_file);
if (ret < 0) {
fail("server: gnutls_psk_set_server_credentials_file failed (%s)\n\n",
gnutls_strerror(ret));
return;
}
gnutls_init(&session, GNUTLS_SERVER);
assert(gnutls_priority_set_direct(session, prio, NULL)>=0);
if (!no_cred)
gnutls_credentials_set(session, GNUTLS_CRD_PSK, server_pskcred);
gnutls_transport_set_int(session, sd);
ret = gnutls_handshake(session);
if (ret < 0) {
gnutls_alert_send_appropriate(session, ret);
if (expect_fail) {
if (ret != expect_fail) {
fail("expected error %d (%s), got %d (%s)\n", expect_fail,
gnutls_strerror(expect_fail),
ret, gnutls_strerror(ret));
}
if (debug)
success("server: Handshake has failed - expected (%s)\n\n",
gnutls_strerror(ret));
} else {
fail("server: Handshake has failed (%s)\n\n",
gnutls_strerror(ret));
}
goto end;
}
if (debug)
success("server: Handshake was completed\n");
/* see the Getting peer's information example */
/* print_info(session); */
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));
}
}
kx = gnutls_kx_get(session);
desc = gnutls_session_get_desc(session);
success(" - connected with: %s\n", desc);
gnutls_free(desc);
/* do not wait for the peer to close the connection.
*/
gnutls_bye(session, GNUTLS_SHUT_WR);
if (expect_fail)
fail("server: expected failure but connection succeeded!\n");
if (!no_cred) {
pskid = gnutls_psk_server_get_username(session);
if (pskid == NULL || strcmp(pskid, user) != 0) {
fail("server: username (%s), does not match expected (%s)\n",
pskid, user);
}
}
if (exp_kx && kx != exp_kx) {
fail("server: expected key exchange %s, but got %s\n",
gnutls_kx_get_name(exp_kx),
gnutls_kx_get_name(kx));
}
end:
close(sd);
gnutls_deinit(session);
gnutls_psk_free_server_credentials(server_pskcred);
gnutls_global_deinit();
if (debug)
success("server: finished\n");
}
static
void run_test3(const char *prio, const char *sprio, const char *user, const gnutls_datum_t *key, bool no_cred,
unsigned expect_hint, int exp_kx, int expect_fail_cli, int expect_fail_serv)
{
pid_t child;
int err;
int sockets[2];
signal(SIGPIPE, SIG_IGN);
if (expect_fail_serv || expect_fail_cli) {
success("ntest %s (user:%s)\n", prio, user);
} else {
success("test %s (user:%s)\n", prio, user);
}
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) {
close(sockets[1]);
int status;
/* parent */
server(sockets[0], sprio?sprio:prio, user, no_cred, expect_fail_serv, exp_kx);
wait(&status);
check_wait_status(status);
} else {
close(sockets[0]);
client(sockets[1], prio, user, key, expect_hint, expect_fail_cli, exp_kx);
exit(0);
}
}
static
void run_test2(const char *prio, const char *sprio, const char *user, const gnutls_datum_t *key,
unsigned expect_hint, int exp_kx, int expect_fail_cli, int expect_fail_serv)
{
run_test3(prio, sprio, user, key, 0, expect_hint, exp_kx, expect_fail_cli, expect_fail_serv);
}
static
void run_test_ok(const char *prio, const char *user, const gnutls_datum_t *key, unsigned expect_hint, int expect_fail)
{
run_test2(prio, NULL, user, key, expect_hint, GNUTLS_KX_PSK, expect_fail, expect_fail);
}
static
void run_ectest_ok(const char *prio, const char *user, const gnutls_datum_t *key, unsigned expect_hint, int expect_fail)
{
run_test2(prio, NULL, user, key, expect_hint, GNUTLS_KX_ECDHE_PSK, expect_fail, expect_fail);
}
static
void run_dhtest_ok(const char *prio, const char *user, const gnutls_datum_t *key, unsigned expect_hint, int expect_fail)
{
run_test2(prio, NULL, user, key, expect_hint, GNUTLS_KX_DHE_PSK, expect_fail, expect_fail);
}
void doit(void)
{
const gnutls_datum_t key = { (void *) "9e32cf7786321a828ef7668f09fb35db", 32 };
const gnutls_datum_t wrong_key = { (void *) "9e31cf7786321a828ef7668f09fb35db", 32 };
run_test_ok("NORMAL:-VERS-ALL:+VERS-TLS1.2:-KX-ALL:+PSK", "jas", &key, 1, 0);
run_dhtest_ok("NORMAL:-VERS-ALL:+VERS-TLS1.2:-KX-ALL:+DHE-PSK", "jas", &key, 1, 0);
run_ectest_ok("NORMAL:-VERS-ALL:+VERS-TLS1.2:-KX-ALL:+ECDHE-PSK", "jas", &key, 1, 0);
run_test2("NORMAL:-VERS-ALL:+VERS-TLS1.2:-KX-ALL:+PSK", NULL, "unknown", &key, 1, 0, GNUTLS_E_FATAL_ALERT_RECEIVED, GNUTLS_E_DECRYPTION_FAILED);
run_test2("NORMAL:-VERS-ALL:+VERS-TLS1.2:-KX-ALL:+PSK", NULL, "jas", &wrong_key, 1, 0, GNUTLS_E_FATAL_ALERT_RECEIVED, GNUTLS_E_DECRYPTION_FAILED);
run_test2("NORMAL:-VERS-ALL:+VERS-TLS1.2:-KX-ALL:+PSK", NULL, "non-hex", &key, 1, 0, GNUTLS_E_FATAL_ALERT_RECEIVED, GNUTLS_E_KEYFILE_ERROR);
run_test_ok("NORMAL:-VERS-ALL:+VERS-TLS1.2:-KX-ALL:+PSK", "jas", &key, 1, 0);
run_test_ok("NORMAL:-KX-ALL:+PSK", "jas", &key, 0, 0);
run_test2("NORMAL:+PSK", NULL, "unknown", &key, 1, 0, GNUTLS_E_FATAL_ALERT_RECEIVED, GNUTLS_E_RECEIVED_ILLEGAL_PARAMETER);
run_test2("NORMAL:+PSK", NULL, "jas", &wrong_key, 1, 0, GNUTLS_E_FATAL_ALERT_RECEIVED, GNUTLS_E_RECEIVED_ILLEGAL_PARAMETER);
run_test2("NORMAL:-KX-ALL:+PSK", NULL, "non-hex", &key, 1, 0, GNUTLS_E_FATAL_ALERT_RECEIVED, GNUTLS_E_KEYFILE_ERROR);
run_dhtest_ok("NORMAL:-VERS-ALL:+VERS-TLS1.3:+DHE-PSK:-GROUP-EC-ALL", "jas", &key, 0, 0);
run_test_ok("NORMAL:-VERS-ALL:+VERS-TLS1.3:+PSK", "jas", &key, 0, 0);
/* test priorities of DHE-PSK and PSK */
run_ectest_ok("NORMAL:-VERS-ALL:+VERS-TLS1.3:-CIPHER-ALL:+AES-128-GCM:+DHE-PSK:+PSK:-GROUP-DH-ALL", "jas", &key, 0, 0);
run_test_ok("NORMAL:-VERS-ALL:+VERS-TLS1.3:-CIPHER-ALL:+AES-128-GCM:+PSK:+DHE-PSK:-GROUP-DH-ALL", "jas", &key, 0, 0);
run_test2("NORMAL:-VERS-ALL:+VERS-TLS1.3:-CIPHER-ALL:+AES-128-GCM:+DHE-PSK:+PSK:-GROUP-DH-ALL",
"NORMAL:-VERS-ALL:+VERS-TLS1.3:-CIPHER-ALL:+AES-128-GCM:+PSK:+DHE-PSK:%SERVER_PRECEDENCE:-GROUP-DH-ALL",
"jas", &key, 0, GNUTLS_KX_PSK, 0, 0);
/* try with PRF that doesn't match binder (SHA256) */
run_test2("NORMAL:-VERS-ALL:+VERS-TLS1.3:-CIPHER-ALL:+AES-256-GCM:+PSK:+DHE-PSK", NULL, "jas", &key, 0, 0, GNUTLS_E_FATAL_ALERT_RECEIVED, GNUTLS_E_NO_CIPHER_SUITES);
/* try with no groups and PSK */
run_test_ok("NORMAL:-VERS-ALL:+VERS-TLS1.3:+PSK:-GROUP-ALL", "jas", &key, 0, 0);
/* try without any groups but DHE-PSK */
run_test2("NORMAL:-VERS-ALL:+VERS-TLS1.3:+DHE-PSK:-GROUP-ALL", "NORMAL:-VERS-ALL:+VERS-TLS1.3:+DHE-PSK:+PSK", "jas", &key, 0, 0, GNUTLS_E_FATAL_ALERT_RECEIVED, GNUTLS_E_NO_COMMON_KEY_SHARE);
run_test2("NORMAL:-VERS-ALL:+VERS-TLS1.3:+DHE-PSK:-GROUP-ALL", "NORMAL:-VERS-ALL:+VERS-TLS1.3:+DHE-PSK:+PSK:-GROUP-ALL", "jas", &key, 0, 0, GNUTLS_E_FATAL_ALERT_RECEIVED, GNUTLS_E_NO_COMMON_KEY_SHARE);
/* if user invalid we continue without PSK */
run_test2("NORMAL:-VERS-ALL:+VERS-TLS1.3:+PSK:+DHE-PSK", NULL, "non-hex", &key, 0, 0, GNUTLS_E_FATAL_ALERT_RECEIVED, GNUTLS_E_KEYFILE_ERROR);
run_test2("NORMAL:-VERS-ALL:+VERS-TLS1.3:+PSK:+DHE-PSK", NULL, "unknown", &key, 0, 0, GNUTLS_E_FATAL_ALERT_RECEIVED, GNUTLS_E_RECEIVED_ILLEGAL_PARAMETER);
run_test2("NORMAL:-VERS-ALL:+VERS-TLS1.3:+PSK:+DHE-PSK", NULL, "jas", &wrong_key, 0, 0, GNUTLS_E_FATAL_ALERT_RECEIVED, GNUTLS_E_RECEIVED_ILLEGAL_PARAMETER);
/* try with HelloRetryRequest and PSK */
run_test2("NORMAL:-VERS-ALL:+VERS-TLS1.3:+DHE-PSK:-GROUP-ALL:+GROUP-FFDHE2048:+GROUP-FFDHE4096", "NORMAL:-VERS-ALL:+VERS-TLS1.3:+DHE-PSK:-GROUP-ALL:+GROUP-FFDHE4096", "jas", &key, 0, GNUTLS_KX_DHE_PSK, 0, 0);
/* try without server credentials */
run_test3("NORMAL:-VERS-ALL:+VERS-TLS1.3:+PSK:+DHE-PSK", NULL, "jas", &key, 1, 0, 0, GNUTLS_E_PUSH_ERROR, GNUTLS_E_INSUFFICIENT_CREDENTIALS);
}
#endif /* _WIN32 */