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/*
* OpenConnect (SSL + DTLS) VPN client
*
* Copyright © 2008 Intel Corporation.
*
* Author: David Woodhouse <dwmw2@infradead.org>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public License
* version 2.1, as published by the Free Software Foundation.
*
* This program 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to:
*
* Free Software Foundation, Inc.
* 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301 USA
*/
#include <stdio.h>
#include <stdarg.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <fcntl.h>
#include <unistd.h>
#include <pwd.h>
#include <sys/syslog.h>
#include <sys/utsname.h>
#include <sys/types.h>
#include <openssl/rand.h>
#define _GNU_SOURCE
#include <getopt.h>
#include "openconnect.h"
static int write_new_config(struct openconnect_info *vpninfo, char *buf, int buflen);
static void write_progress(struct openconnect_info *info, int level, const char *fmt, ...);
static void syslog_progress(struct openconnect_info *info, int level, const char *fmt, ...);
int verbose = PRG_INFO;
static struct option long_options[] = {
{"certificate", 1, 0, 'c'},
{"sslkey", 1, 0, 'k'},
{"cookie", 1, 0, 'C'},
{"deflate", 0, 0, 'd'},
{"no-deflate", 0, 0, 'D'},
{"help", 0, 0, 'h'},
{"interface", 1, 0, 'i'},
{"mtu", 1, 0, 'm'},
{"setuid", 1, 0, 'U'},
{"script", 1, 0, 's'},
{"script-tun", 0, 0, 'S'},
{"syslog", 0, 0, 'l'},
{"tpm-key", 0, 0, 't'},
{"tpm-password", 1, 0, 'p'},
{"user", 1, 0, 'u'},
{"verbose", 0, 0, 'v'},
{"version", 0, 0, 'V'},
{"cafile", 1, 0, '0'},
{"no-dtls", 0, 0, '1'},
{"cookieonly", 0, 0, '2'},
{"printcookie", 0, 0, '3'},
{"quiet", 0, 0, 'q'},
{"queue-len", 1, 0, 'Q'},
{"xmlconfig", 1, 0, 'x'},
{"cookie-on-stdin", 0, 0, '4'},
{"passwd-on-stdin", 0, 0, '5'},
{"no-passwd", 0, 0, '6'},
{"reconnect-timeout", 1, 0, '7'},
{NULL, 0, 0, 0},
};
void usage(void)
{
printf("Usage: openconnect [options] <server>\n");
printf("Open client for Cisco AnyConnect VPN, version %s\n\n", openconnect_version);
printf(" -c, --certificate=CERT Use SSL client certificate CERT\n");
printf(" -k, --sslkey=KEY Use SSL private key file KEY\n");
printf(" -C, --cookie=COOKIE Use WebVPN cookie COOKIE\n");
printf(" --cookie-on-stdin Read cookie from standard input\n");
printf(" -d, --deflate Enable compression (default)\n");
printf(" -D, --no-deflate Disable compression\n");
printf(" -h, --help Display help text\n");
printf(" -i, --interface=IFNAME Use IFNAME for tunnel interface\n");
printf(" -l, --syslog Use syslog for progress messages\n");
printf(" -U, --setuid=USER Drop privileges after connecting\n");
printf(" -m, --mtu=MTU Request MTU from server\n");
printf(" -p, --tpm-password=PASS Set TPM SRK PIN\n");
printf(" -q, --quiet Less output\n");
printf(" -Q, --queue-len=LEN Set packet queue limit to LEN pkts\n");
printf(" -s, --script=SCRIPT Use vpnc-compatible config script\n");
printf(" -S, --script-tun Pass traffic to 'script' program, not tun\n");
printf(" -t, --tpm Use TPM engine for private key\n");
printf(" -u, --user=NAME Set login username\n");
printf(" -V, --version Report version number\n");
printf(" -v, --verbose More output\n");
printf(" -x, --xmlconfig=CONFIG XML config file\n");
printf(" --cookieonly Fetch webvpn cookie only; don't connect\n");
printf(" --printcookie Print webvpn cookie before connecting\n");
printf(" --cafile=FILE Cert file for server verification\n");
printf(" --no-dtls Disable DTLS\n");
printf(" --no-passwd Disable password/SecurID authentication\n");
printf(" --passwd-on-stdin Read password from standard input\n");
printf(" --reconnect-timeout Connection retry timeout in seconds\n");
exit(1);
}
static void read_stdin(char **string)
{
char *c = malloc(100);
if (!c) {
fprintf(stderr, "Allocation failure for string from stdin\n");
exit(1);
}
if (!fgets(c, 100, stdin)) {
perror("fgets (stdin)");
exit(1);
}
*string = c;
c = strchr(*string, '\n');
if (c)
*c = 0;
}
int main(int argc, char **argv)
{
struct openconnect_info *vpninfo;
struct utsname utsbuf;
int cookieonly = 0;
int use_syslog = 0;
uid_t uid = getuid();
int opt;
openconnect_init_openssl();
vpninfo = malloc(sizeof(*vpninfo));
if (!vpninfo) {
fprintf(stderr, "Failed to allocate vpninfo structure\n");
exit(1);
}
memset(vpninfo, 0, sizeof(*vpninfo));
/* Set up some defaults */
vpninfo->tun_fd = vpninfo->ssl_fd = vpninfo->dtls_fd = vpninfo->new_dtls_fd = -1;
vpninfo->useragent = openconnect_create_useragent("Open AnyConnect VPN Agent %s");
vpninfo->mtu = 1406;
vpninfo->deflate = 1;
vpninfo->dtls_attempt_period = 60;
vpninfo->max_qlen = 10;
vpninfo->reconnect_interval = RECONNECT_INTERVAL_MIN;
vpninfo->reconnect_timeout = 300;
if (RAND_bytes(vpninfo->dtls_secret, sizeof(vpninfo->dtls_secret)) != 1) {
fprintf(stderr, "Failed to initialise DTLS secret\n");
exit(1);
}
if (!uname(&utsbuf))
vpninfo->localname = utsbuf.nodename;
else
vpninfo->localname = "localhost";
while ((opt = getopt_long(argc, argv, "C:c:Ddhi:k:lp:Q:qSs:tU:u:Vvx:",
long_options, NULL))) {
if (opt < 0)
break;
switch (opt) {
case '0':
vpninfo->cafile = optarg;
break;
case '1':
vpninfo->dtls_attempt_period = 0;
break;
case '2':
cookieonly = 1;
break;
case '3':
cookieonly = 2;
break;
case '4':
read_stdin(&vpninfo->cookie);
/* If the cookie is empty, ignore it */
if (! *vpninfo->cookie) {
vpninfo->cookie = NULL;
}
break;
case '5':
read_stdin(&vpninfo->password);
break;
case '6':
vpninfo->nopasswd = 1;
break;
case '7':
vpninfo->reconnect_timeout = atoi(optarg);
break;
case 'C':
vpninfo->cookie = optarg;
break;
case 'c':
vpninfo->cert = optarg;
break;
case 'k':
vpninfo->sslkey = optarg;
break;
case 'd':
vpninfo->deflate = 1;
break;
case 'D':
vpninfo->deflate = 0;
break;
case 'h':
usage();
case 'i':
vpninfo->ifname = optarg;
break;
case 'l':
use_syslog = 1;
break;
case 'm':
vpninfo->mtu = atol(optarg);
if (vpninfo->mtu < 576) {
fprintf(stderr, "MTU %d too small\n", vpninfo->mtu);
vpninfo->mtu = 576;
}
break;
case 'p':
vpninfo->tpmpass = optarg;
break;
case 's':
vpninfo->vpnc_script = optarg;
break;
case 'S':
vpninfo->script_tun = 1;
break;
case 't':
vpninfo->tpm = 1;
break;
case 'u':
vpninfo->username = optarg;
break;
case 'U': {
char *strend;
uid = strtol(optarg, &strend, 0);
if (strend[0]) {
struct passwd *pw = getpwnam(optarg);
if (!pw) {
fprintf(stderr, "Invalid user \"%s\"\n",
optarg);
exit(1);
}
uid = pw->pw_uid;
}
break;
}
case 'Q':
vpninfo->max_qlen = atol(optarg);
if (!vpninfo->max_qlen) {
fprintf(stderr, "Queue length zero not permitted; using 1\n");
vpninfo->max_qlen = 1;
}
break;
case 'q':
verbose = PRG_ERR;
break;
case 'v':
verbose = PRG_TRACE;
break;
case 'V':
printf("OpenConnect version %s\n", openconnect_version);
exit(0);
case 'x':
vpninfo->xmlconfig = optarg;
vpninfo->write_new_config = write_new_config;
break;
default:
usage();
}
}
if (optind != argc - 1) {
fprintf(stderr, "No server specified\n");
usage();
}
if (!vpninfo->sslkey)
vpninfo->sslkey = vpninfo->cert;
if (use_syslog) {
openlog("openconnect", LOG_PID, LOG_DAEMON);
vpninfo->progress = syslog_progress;
} else {
vpninfo->progress = write_progress;
}
if (config_lookup_host(vpninfo, argv[optind]))
exit(1);
if (!vpninfo->hostname)
vpninfo->hostname = strdup(argv[optind]);
vpninfo->urlpath = strdup("/");
#ifdef SSL_UI
set_openssl_ui();
#endif
if (!vpninfo->cookie && openconnect_obtain_cookie(vpninfo) != 1) {
fprintf(stderr, "Failed to obtain WebVPN cookie\n");
exit(1);
}
if (cookieonly) {
printf("%s\n", vpninfo->cookie);
if (cookieonly == 1)
/* We use cookieonly=2 for 'print it and continue' */
exit(0);
}
if (make_cstp_connection(vpninfo)) {
fprintf(stderr, "Creating SSL connection failed\n");
exit(1);
}
if (setup_tun(vpninfo)) {
fprintf(stderr, "Set up tun device failed\n");
exit(1);
}
if (uid != getuid()) {
if (setuid(uid)) {
fprintf(stderr, "Failed to set uid %d\n", uid);
exit(1);
}
}
if (vpninfo->dtls_attempt_period && setup_dtls(vpninfo))
fprintf(stderr, "Set up DTLS failed; using SSL instead\n");
vpninfo->progress(vpninfo, PRG_INFO,
"Connected %s as %s, using %s\n", vpninfo->ifname,
vpninfo->vpn_addr,
(vpninfo->dtls_fd==-1)?(vpninfo->deflate?"SSL + deflate":"SSL"):"DTLS");
vpn_mainloop(vpninfo);
exit(1);
}
static int write_new_config(struct openconnect_info *vpninfo, char *buf, int buflen)
{
int config_fd;
config_fd = open(vpninfo->xmlconfig, O_WRONLY|O_TRUNC|O_CREAT, 0644);
if (!config_fd) {
fprintf(stderr, "Failed to open %s for write: %s\n",
vpninfo->xmlconfig, strerror(errno));
return -errno;
}
/* FIXME: We should actually write to a new tempfile, then rename */
write(config_fd, buf, buflen);
return 0;
}
void write_progress(struct openconnect_info *info, int level, const char *fmt, ...)
{
FILE *outf = level?stdout:stderr;
va_list args;
if (verbose >= level) {
va_start(args, fmt);
vfprintf(outf, fmt, args);
va_end(args);
}
}
void syslog_progress(struct openconnect_info *info, int level,
const char *fmt, ...)
{
int priority = level?LOG_INFO:LOG_NOTICE;
va_list args;
if (verbose >= level) {
va_start(args, fmt);
vsyslog(priority, fmt, args);
va_end(args);
}
}
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