/*
* Copyright (C) 2017-2018 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
*/
#ifdef HAVE_CONFIG_H
#include
#endif
#include
#include
#if defined(_WIN32)
int main()
{
exit(77);
}
#else
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include "cert-common.h"
#include "utils.h"
/* This program tests the ProtocolVersion of Client Hello
* and whether the supported_versions extension is present and
* contains 0x0304 (TLS 1.3).
*/
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 void client(int fd)
{
int ret;
gnutls_certificate_credentials_t x509_cred;
gnutls_session_t session;
global_init();
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_handshake_set_timeout(session, 20 * 1000);
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");
/* 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);
close(fd);
gnutls_deinit(session);
gnutls_certificate_free_credentials(x509_cred);
gnutls_global_deinit();
}
static unsigned client_hello_ok = 0;
static unsigned server_hello_ok = 0;
#define HANDSHAKE_SESSION_ID_POS 34
#define TLS_EXT_SUPPORTED_VERSIONS 43
#define SKIP16(pos, total) { \
uint16_t _s; \
if (pos+2 > total) fail("error\n"); \
_s = (msg->data[pos] << 8) | msg->data[pos+1]; \
if ((size_t)(pos+2+_s) > total) fail("error\n"); \
pos += 2+_s; \
}
#define SKIP8(pos, total) { \
uint8_t _s; \
if (pos+1 > total) fail("error\n"); \
_s = msg->data[pos]; \
if ((size_t)(pos+1+_s) > total) fail("error\n"); \
pos += 1+_s; \
}
static int client_hello_callback(gnutls_session_t session, unsigned int htype,
unsigned post, unsigned int incoming, const gnutls_datum_t *msg)
{
ssize_t pos;
if (htype == GNUTLS_HANDSHAKE_SERVER_HELLO && post == GNUTLS_HOOK_POST) {
/* check whether TLS 1.3 is negotiated */
pos = 0;
if (msg->size < 2) {
fail("error in server hello size\n");
}
success("server hello:\n\t%d.%d\n",
(int)msg->data[pos], (int)msg->data[pos+1]);
if (msg->data[pos] != 0x03 || msg->data[pos+1] != 0x03) {
fail("fail expected TLS 1.2 in server hello, got %d.%d\n", (int)msg->data[pos], (int)msg->data[pos+1]);
}
server_hello_ok = 1;
return GNUTLS_E_INTERRUPTED;
}
if (htype != GNUTLS_HANDSHAKE_CLIENT_HELLO || post != GNUTLS_HOOK_PRE)
return 0;
if (msg->size < HANDSHAKE_SESSION_ID_POS)
return -1;
/* we expect the legacy version to be present */
/* ProtocolVersion legacy_version = 0x0303 */
if (msg->data[0] != 0x03 || msg->data[1] != 0x03) {
fail("ProtocolVersion contains %d.%d\n", (int)msg->data[0], (int)msg->data[1]);
}
pos = HANDSHAKE_SESSION_ID_POS;
/* legacy_session_id */
SKIP8(pos, msg->size);
/* CipherSuites */
SKIP16(pos, msg->size);
/* legacy_compression_methods */
SKIP8(pos, msg->size);
pos += 2;
while (pos < msg->size) {
uint16_t type;
if (pos+4 > msg->size)
fail("invalid client hello\n");
type = (msg->data[pos] << 8) | msg->data[pos+1];
pos+=2;
success("Found extension %d\n", (int)type);
if (type != TLS_EXT_SUPPORTED_VERSIONS) {
SKIP16(pos, msg->size);
} else { /* found */
ssize_t size = (msg->data[pos] << 8) | msg->data[pos+1];
pos+=2;
size = msg->data[pos];
if (size > msg->size+pos) {
fail("error in extension length\n");
}
if (size % 2 == 1) {
fail("extension length is odd!\n");
}
if (size != 6) {
fail("expected three versions only (%d)!\n", (int)size);
}
pos++;
success("client hello:\n\t%d.%d\n\t%d.%d\n\t%d.%d\n",
(int)msg->data[pos], (int)msg->data[pos+1],
(int)msg->data[pos+2], (int)msg->data[pos+3],
(int)msg->data[pos+4], (int)msg->data[pos+5]);
if (msg->data[pos] != 0x03 || msg->data[pos+1] != 0x04) {
fail("fail expected TLS 1.3, got %d.%d\n", (int)msg->data[pos], (int)msg->data[pos+1]);
}
pos+=2;
if (msg->data[pos] != 0x03 || msg->data[pos+1] != 0x03) {
fail("fail expected TLS 1.2, got %d.%d\n", (int)msg->data[pos], (int)msg->data[pos+1]);
}
pos+=2;
if (msg->data[pos] != 0x03 || msg->data[pos+1] != 0x01) {
fail("fail expected TLS 1.0, got %d.%d\n", (int)msg->data[pos], (int)msg->data[pos+1]);
}
pos+=2;
client_hello_ok = 1;
break;
}
}
return 0;
}
static void server(int fd)
{
int ret;
char buffer[MAX_BUF + 1];
gnutls_session_t session;
gnutls_certificate_credentials_t x509_cred;
/* this must be called once in the program
*/
global_init();
memset(buffer, 0, sizeof(buffer));
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);
gnutls_handshake_set_hook_function(session, GNUTLS_HANDSHAKE_ANY,
GNUTLS_HOOK_BOTH,
client_hello_callback);
/* avoid calling all the priority functions, since the defaults
* are adequate.
*/
gnutls_priority_set_direct(session, "NORMAL:+VERS-TLS1.3", NULL);
gnutls_credentials_set(session, GNUTLS_CRD_CERTIFICATE, x509_cred);
gnutls_transport_set_int(session, fd);
do {
ret = gnutls_handshake(session);
if (ret == GNUTLS_E_INTERRUPTED) { /* expected */
break;
}
} while (ret < 0 && gnutls_error_is_fatal(ret) == 0);
if (client_hello_ok == 0) {
fail("server: did not verify the client hello\n");
}
if (server_hello_ok == 0) {
fail("server: did not verify the server hello contents\n");
}
close(fd);
gnutls_deinit(session);
gnutls_certificate_free_credentials(x509_cred);
gnutls_global_deinit();
if (debug)
success("server: client/server hello were verified\n");
}
static void ch_handler(int sig)
{
int status = 0;
wait(&status);
check_wait_status(status);
return;
}
void doit(void)
{
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]);
kill(child, SIGTERM);
} else {
close(fd[0]);
client(fd[1]);
exit(0);
}
}
#endif /* _WIN32 */