/*
* Copyright (C) 2004-2012 Free Software Foundation, Inc.
* Copyright (C) 2013 Adam Sampson <ats@offog.org>
*
* 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
*/
/* Parts copied from GnuTLS example programs. */
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <stdio.h>
#include <stdlib.h>
#if defined(_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 <gnutls/dtls.h>
#include <sys/wait.h>
#include <signal.h>
#include "utils.h"
static void wrap_db_init(void);
static void wrap_db_deinit(void);
static int wrap_db_store(void *dbf, gnutls_datum_t key,
gnutls_datum_t data);
static gnutls_datum_t wrap_db_fetch(void *dbf, gnutls_datum_t key);
static int wrap_db_delete(void *dbf, gnutls_datum_t key);
#define TLS_SESSION_CACHE 50
struct params_res {
const char *desc;
int enable_db;
int enable_session_ticket_server;
int enable_session_ticket_client;
int expect_resume;
};
pid_t child;
struct params_res resume_tests[] = {
{"try to resume from db", 50, 0, 0, 1},
{"try to resume from session ticket", 0, 1, 1, 1},
{"try to resume from session ticket (server only)", 0, 1, 0, 0},
{"try to resume from session ticket (client only)", 0, 0, 1, 0},
{NULL, -1}
};
/* A very basic TLS client, with anonymous authentication.
*/
#define SESSIONS 2
#define MAX_BUF 5*1024
#define MSG "Hello TLS"
static void tls_log_func(int level, const char *str)
{
fprintf(stderr, "%s |<%d>| %s", child ? "server" : "client", level,
str);
}
static void client(int sds[], struct params_res *params)
{
int ret, ii;
gnutls_session_t session;
char buffer[MAX_BUF + 1];
gnutls_anon_client_credentials_t anoncred;
/* Need to enable anonymous KX specifically. */
/* variables used in session resuming
*/
int t;
gnutls_datum_t session_data;
if (debug) {
gnutls_global_set_log_function(tls_log_func);
gnutls_global_set_log_level(3);
}
global_init();
gnutls_anon_allocate_client_credentials(&anoncred);
for (t = 0; t < SESSIONS; t++) {
int sd = sds[t];
/* Initialize TLS session
*/
gnutls_init(&session,
GNUTLS_CLIENT | GNUTLS_DATAGRAM);
/* Use default priorities */
if (params->enable_session_ticket_client)
gnutls_priority_set_direct(session,
"NONE:+VERS-DTLS1.0:+CIPHER-ALL:+MAC-ALL:+SIGN-ALL:+COMP-ALL:+ANON-DH",
NULL);
else
gnutls_priority_set_direct(session,
"NONE:+VERS-DTLS1.0:+CIPHER-ALL:+MAC-ALL:+SIGN-ALL:+COMP-ALL:+ANON-DH:%NO_TICKETS",
NULL);
/* put the anonymous credentials to the current session
*/
gnutls_credentials_set(session, GNUTLS_CRD_ANON, anoncred);
if (t > 0) {
/* if this is not the first time we connect */
gnutls_session_set_data(session, session_data.data,
session_data.size);
gnutls_free(session_data.data);
}
gnutls_transport_set_int(session, sd);
/* Perform the TLS handshake
*/
gnutls_dtls_set_timeouts(session, 3*1000, 240 * 1000);
do {
ret = gnutls_handshake(session);
} while (ret < 0 && gnutls_error_is_fatal(ret) == 0);
if (ret < 0) {
gnutls_perror(ret);
fail("client: Handshake failed\n");
goto end;
} else {
if (debug)
success
("client: Handshake was completed\n");
}
if (t == 0) { /* the first time we connect */
/* get the session data size */
ret =
gnutls_session_get_data2(session,
&session_data);
if (ret < 0)
fail("Getting resume data failed\n");
} else { /* the second time we connect */
/* check if we actually resumed the previous session */
if (gnutls_session_is_resumed(session) != 0) {
if (params->expect_resume) {
if (debug)
success
("- Previous session was resumed\n");
} else
fail("- Previous session was resumed\n");
} else {
if (params->expect_resume) {
fail("*** Previous session was NOT resumed\n");
} else {
if (debug)
success
("*** Previous session was NOT resumed (expected)\n");
}
}
}
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;
}
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);
close(sd);
gnutls_deinit(session);
}
end:
gnutls_anon_free_client_credentials(anoncred);
}
/* This is a sample TLS 1.0 echo server, for anonymous authentication only.
*/
#define DH_BITS 1024
/* These are global */
static gnutls_dh_params_t dh_params;
static int generate_dh_params(void)
{
const gnutls_datum_t p3 = { (void *) pkcs3, strlen(pkcs3) };
/* Generate Diffie-Hellman parameters - for use with DHE
* kx algorithms. These should be discarded and regenerated
* once a day, once a week or once a month. Depending on the
* security requirements.
*/
gnutls_dh_params_init(&dh_params);
return gnutls_dh_params_import_pkcs3(dh_params, &p3,
GNUTLS_X509_FMT_PEM);
}
static char buffer[MAX_BUF + 1];
static void global_stop(void)
{
if (debug)
success("global stop\n");
gnutls_dh_params_deinit(dh_params);
gnutls_global_deinit();
}
static void server(int sds[], struct params_res *params)
{
gnutls_anon_server_credentials_t anoncred;
static gnutls_datum_t session_ticket_key = { NULL, 0 };
int ret;
size_t t;
gnutls_session_t session;
/* this must be called once in the program, it is mostly for the server.
*/
if (debug) {
gnutls_global_set_log_function(tls_log_func);
gnutls_global_set_log_level(3);
}
global_init();
gnutls_anon_allocate_server_credentials(&anoncred);
if (debug)
success("Launched, generating DH parameters...\n");
gnutls_anon_set_server_dh_params(anoncred, dh_params);
if (params->enable_db) {
wrap_db_init();
}
if (params->enable_session_ticket_server)
gnutls_session_ticket_key_generate(&session_ticket_key);
for (t = 0; t < SESSIONS; t++) {
int sd = sds[t];
gnutls_init(&session, GNUTLS_SERVER | GNUTLS_DATAGRAM);
gnutls_priority_set_direct(session,
"NONE:+VERS-DTLS1.0:+CIPHER-ALL:+MAC-ALL:+SIGN-ALL:+COMP-ALL:+ANON-DH",
NULL);
gnutls_credentials_set(session, GNUTLS_CRD_ANON, anoncred);
gnutls_dh_set_prime_bits(session, DH_BITS);
if (params->enable_db) {
gnutls_db_set_retrieve_function(session, wrap_db_fetch);
gnutls_db_set_remove_function(session, wrap_db_delete);
gnutls_db_set_store_function(session, wrap_db_store);
gnutls_db_set_ptr(session, NULL);
}
if (params->enable_session_ticket_server)
gnutls_session_ticket_enable_server(session,
&session_ticket_key);
gnutls_transport_set_int(session, sd);
gnutls_dtls_set_timeouts(session, 3*1000, 240 * 1000);
do {
ret = gnutls_handshake(session);
} while (ret < 0 && (ret == GNUTLS_E_INTERRUPTED||ret == GNUTLS_E_AGAIN));
if (ret < 0) {
close(sd);
gnutls_deinit(session);
kill(child, SIGTERM);
fail("server: Handshake has failed (%s)\n\n",
gnutls_strerror(ret));
return;
}
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);
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) {
kill(child, SIGTERM);
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));
}
}
/* do not wait for the peer to close the connection.
*/
gnutls_bye(session, GNUTLS_SHUT_WR);
close(sd);
gnutls_deinit(session);
}
if (params->enable_db) {
wrap_db_deinit();
}
gnutls_free(session_ticket_key.data);
gnutls_anon_free_server_credentials(anoncred);
if (debug)
success("server: finished\n");
}
void doit(void)
{
int i, err;
signal(SIGCHLD, SIG_IGN);
signal(SIGPIPE, SIG_IGN);
generate_dh_params();
for (i = 0; resume_tests[i].desc; i++) {
int client_sds[SESSIONS], server_sds[SESSIONS];
int j;
printf("%s\n", resume_tests[i].desc);
for (j = 0; j < SESSIONS; j++) {
int sockets[2];
err = socketpair(AF_UNIX, SOCK_STREAM, 0, sockets);
if (err == -1) {
perror("socketpair");
fail("socketpair failed\n");
return;
}
server_sds[j] = sockets[0];
client_sds[j] = sockets[1];
}
child = fork();
if (child < 0) {
perror("fork");
fail("fork");
return;
}
if (child) {
int status = 0;
/* parent */
for (j = 0; j < SESSIONS; j++)
close(client_sds[j]);
server(server_sds, &resume_tests[i]);
wait(&status);
check_wait_status(status);
} else {
for (j = 0; j < SESSIONS; j++)
close(server_sds[j]);
client(client_sds, &resume_tests[i]);
gnutls_global_deinit();
exit(0);
}
}
global_stop();
}
/* Functions and other stuff needed for session resuming.
* This is done using a very simple list which holds session ids
* and session data.
*/
#define MAX_SESSION_ID_SIZE 32
#define MAX_SESSION_DATA_SIZE 1024
typedef struct {
unsigned char session_id[MAX_SESSION_ID_SIZE];
unsigned int session_id_size;
char session_data[MAX_SESSION_DATA_SIZE];
int session_data_size;
} CACHE;
static CACHE *cache_db;
static int cache_db_ptr = 0;
static void wrap_db_init(void)
{
/* allocate cache_db */
cache_db = calloc(1, TLS_SESSION_CACHE * sizeof(CACHE));
}
static void wrap_db_deinit(void)
{
free(cache_db);
cache_db = NULL;
return;
}
static int
wrap_db_store(void *dbf, gnutls_datum_t key, gnutls_datum_t data)
{
if (debug)
success("resume db storing... (%d-%d)\n", key.size,
data.size);
if (debug) {
unsigned int i;
printf("key:\n");
for (i = 0; i < key.size; i++) {
printf("%02x ", key.data[i] & 0xFF);
if ((i + 1) % 16 == 0)
printf("\n");
}
printf("\n");
printf("data:\n");
for (i = 0; i < data.size; i++) {
printf("%02x ", data.data[i] & 0xFF);
if ((i + 1) % 16 == 0)
printf("\n");
}
printf("\n");
}
if (cache_db == NULL)
return -1;
if (key.size > MAX_SESSION_ID_SIZE)
return -1;
if (data.size > MAX_SESSION_DATA_SIZE)
return -1;
memcpy(cache_db[cache_db_ptr].session_id, key.data, key.size);
cache_db[cache_db_ptr].session_id_size = key.size;
memcpy(cache_db[cache_db_ptr].session_data, data.data, data.size);
cache_db[cache_db_ptr].session_data_size = data.size;
cache_db_ptr++;
cache_db_ptr %= TLS_SESSION_CACHE;
return 0;
}
static gnutls_datum_t wrap_db_fetch(void *dbf, gnutls_datum_t key)
{
gnutls_datum_t res = { NULL, 0 };
unsigned i;
if (debug)
success("resume db fetch... (%d)\n", key.size);
if (debug) {
printf("key:\n");
for (i = 0; i < key.size; i++) {
printf("%02x ", key.data[i] & 0xFF);
if ((i + 1) % 16 == 0)
printf("\n");
}
printf("\n");
}
if (cache_db == NULL)
return res;
for (i = 0; i < TLS_SESSION_CACHE; i++) {
if (key.size == cache_db[i].session_id_size &&
memcmp(key.data, cache_db[i].session_id,
key.size) == 0) {
if (debug)
success
("resume db fetch... return info\n");
res.size = cache_db[i].session_data_size;
res.data = gnutls_malloc(res.size);
if (res.data == NULL)
return res;
memcpy(res.data, cache_db[i].session_data,
res.size);
if (debug) {
unsigned j;
printf("data:\n");
for (j = 0; j < res.size; j++) {
printf("%02x ",
res.data[j] & 0xFF);
if ((j + 1) % 16 == 0)
printf("\n");
}
printf("\n");
}
return res;
}
}
if (debug)
success("resume db fetch... NOT FOUND\n");
return res;
}
static int wrap_db_delete(void *dbf, gnutls_datum_t key)
{
int i;
if (cache_db == NULL)
return -1;
for (i = 0; i < TLS_SESSION_CACHE; i++) {
if (key.size == cache_db[i].session_id_size &&
memcmp(key.data, cache_db[i].session_id,
key.size) == 0) {
cache_db[i].session_id_size = 0;
cache_db[i].session_data_size = 0;
return 0;
}
}
return -1;
}
#endif /* _WIN32 */