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main.c
1170 lines (1049 loc) · 31.4 KB
/
main.c
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/*
* OpenConnect (SSL + DTLS) VPN client
*
* Copyright © 2008-2012 Intel Corporation.
* Copyright © 2008 Nick Andrew <nick@nick-andrew.net>
*
* 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
*/
#ifdef HAVE_GETLINE
/* Various BSD systems require this for getline() to be visible */
#define _WITH_GETLINE
#endif
#include <stdio.h>
#ifdef ANDROID
#include <android/log.h>
#else
#include <syslog.h>
#endif
#include <stdarg.h>
#include <stdlib.h>
#include <signal.h>
#include <string.h>
#ifdef HAVE_STRINGS_H
#include <strings.h>
#endif
#include <errno.h>
#include <fcntl.h>
#include <unistd.h>
#include <pwd.h>
#include <sys/utsname.h>
#include <sys/types.h>
#include <termios.h>
#ifdef LIBPROXY_HDR
#include LIBPROXY_HDR
#endif
#include <getopt.h>
#include "openconnect-internal.h"
static int write_new_config(void *_vpninfo,
char *buf, int buflen);
static void write_progress(void *_vpninfo,
int level, const char *fmt, ...);
static void syslog_progress(void *_vpninfo,
int level, const char *fmt, ...);
static int validate_peer_cert(void *_vpninfo,
OPENCONNECT_X509 *peer_cert,
const char *reason);
static int process_auth_form(void *_vpninfo,
struct oc_auth_form *form);
/* A sanity check that the openconnect executable is running against a
library of the same version */
#define openconnect_version_str openconnect_binary_version
#include "version.c"
#undef openconnect_version_str
int verbose = PRG_INFO;
int background;
int do_passphrase_from_fsid;
int nocertcheck;
int non_inter;
int cookieonly;
enum {
OPT_AUTHENTICATE = 0x100,
OPT_AUTHGROUP,
OPT_BASEMTU,
OPT_CAFILE,
OPT_CONFIGFILE,
OPT_COOKIEONLY,
OPT_COOKIE_ON_STDIN,
OPT_CSD_USER,
OPT_CSD_WRAPPER,
OPT_DISABLE_IPV6,
OPT_DTLS_CIPHERS,
OPT_FORCE_DPD,
OPT_KEY_PASSWORD_FROM_FSID,
OPT_LIBPROXY,
OPT_NO_CERT_CHECK,
OPT_NO_DTLS,
OPT_NO_HTTP_KEEPALIVE,
OPT_NO_PASSWD,
OPT_NO_PROXY,
OPT_PIDFILE,
OPT_PASSWORD_ON_STDIN,
OPT_PRINTCOOKIE,
OPT_RECONNECT_TIMEOUT,
OPT_SERVERCERT,
OPT_USERAGENT,
OPT_NON_INTER,
};
#ifdef __sun__
/*
* The 'name' field in Solaris 'struct option' lacks the 'const', and causes
* lots of warnings unless we cast it... https://www.illumos.org/issues/1881
*/
#define OPTION(name, arg, abbrev) {(char *)name, arg, NULL, abbrev}
#else
#define OPTION(name, arg, abbrev) {name, arg, NULL, abbrev}
#endif
static struct option long_options[] = {
OPTION("background", 0, 'b'),
OPTION("pid-file", 1, OPT_PIDFILE),
OPTION("certificate", 1, 'c'),
OPTION("sslkey", 1, 'k'),
OPTION("cookie", 1, 'C'),
OPTION("deflate", 0, 'd'),
OPTION("no-deflate", 0, 'D'),
OPTION("cert-expire-warning", 1, 'e'),
OPTION("usergroup", 1, 'g'),
OPTION("help", 0, 'h'),
OPTION("interface", 1, 'i'),
OPTION("mtu", 1, 'm'),
OPTION("base-mtu", 1, OPT_BASEMTU),
OPTION("setuid", 1, 'U'),
OPTION("script", 1, 's'),
OPTION("script-tun", 0, 'S'),
OPTION("syslog", 0, 'l'),
OPTION("key-password", 1, 'p'),
OPTION("proxy", 1, 'P'),
OPTION("user", 1, 'u'),
OPTION("verbose", 0, 'v'),
OPTION("version", 0, 'V'),
OPTION("cafile", 1, OPT_CAFILE),
OPTION("config", 1, OPT_CONFIGFILE),
OPTION("no-dtls", 0, OPT_NO_DTLS),
OPTION("authenticate", 0, OPT_AUTHENTICATE),
OPTION("cookieonly", 0, OPT_COOKIEONLY),
OPTION("printcookie", 0, OPT_PRINTCOOKIE),
OPTION("quiet", 0, 'q'),
OPTION("queue-len", 1, 'Q'),
OPTION("xmlconfig", 1, 'x'),
OPTION("cookie-on-stdin", 0, OPT_COOKIE_ON_STDIN),
OPTION("passwd-on-stdin", 0, OPT_PASSWORD_ON_STDIN),
OPTION("no-passwd", 0, OPT_NO_PASSWD),
OPTION("reconnect-timeout", 1, OPT_RECONNECT_TIMEOUT),
OPTION("dtls-ciphers", 1, OPT_DTLS_CIPHERS),
OPTION("authgroup", 1, OPT_AUTHGROUP),
OPTION("servercert", 1, OPT_SERVERCERT),
OPTION("key-password-from-fsid", 0, OPT_KEY_PASSWORD_FROM_FSID),
OPTION("useragent", 1, OPT_USERAGENT),
OPTION("csd-user", 1, OPT_CSD_USER),
OPTION("csd-wrapper", 1, OPT_CSD_WRAPPER),
OPTION("disable-ipv6", 0, OPT_DISABLE_IPV6),
OPTION("no-proxy", 0, OPT_NO_PROXY),
OPTION("libproxy", 0, OPT_LIBPROXY),
OPTION("no-http-keepalive", 0, OPT_NO_HTTP_KEEPALIVE),
OPTION("no-cert-check", 0, OPT_NO_CERT_CHECK),
OPTION("force-dpd", 1, OPT_FORCE_DPD),
OPTION("non-inter", 0, OPT_NON_INTER),
OPTION(NULL, 0, 0)
};
static void helpmessage(void)
{
printf(_("For assistance with OpenConnect, please see the web page at\n"
" http://www.infradead.org/openconnect/mail.html\n"));
}
static void print_build_opts(void)
{
const char *comma = ", ", *sep = comma + 1;
#if defined (OPENCONNECT_OPENSSL)
printf(_("Using OpenSSL. Features present:"));
#elif defined (OPENCONNECT_GNUTLS)
printf(_("Using GnuTLS. Features present:"));
#endif
if (openconnect_has_tss_blob_support()) {
printf("%sTPM", sep);
sep = comma;
}
#if defined (OPENCONNECT_OPENSSL) && defined (HAVE_ENGINE)
else {
printf("%sTPM (%s)", sep, _("OpenSSL ENGINE not present"));
sep = comma;
}
#endif
if (openconnect_has_pkcs11_support()) {
printf("%sPKCS#11", sep);
sep = comma;
}
#ifdef HAVE_DTLS
printf("%sDTLS", sep);
#if defined (OPENCONNECT_GNUTLS) && defined (DTLS_OPENSSL)
printf(" (%s)", _("using OpenSSL"));
#endif
printf("\n");
#else
printf(_("\nWARNING: No DTLS support in this binary. Performance will be impaired.\n"));
#endif
}
static void usage(void)
{
printf(_("Usage: openconnect [options] <server>\n"));
printf(_("Open client for Cisco AnyConnect VPN, version %s\n\n"), openconnect_version_str);
print_build_opts();
printf(" --config=CONFIGFILE %s\n", _("Read options from config file"));
printf(" -b, --background %s\n", _("Continue in background after startup"));
printf(" --pid-file=PIDFILE %s\n", _("Write the daemons pid to this file"));
printf(" -c, --certificate=CERT %s\n", _("Use SSL client certificate CERT"));
printf(" -e, --cert-expire-warning=DAYS %s\n", _("Warn when certificate lifetime < DAYS"));
printf(" -k, --sslkey=KEY %s\n", _("Use SSL private key file KEY"));
printf(" -K, --key-type=TYPE %s\n", _("Private key type (PKCS#12 / TPM / PEM)"));
printf(" -C, --cookie=COOKIE %s\n", _("Use WebVPN cookie COOKIE"));
printf(" --cookie-on-stdin %s\n", _("Read cookie from standard input"));
printf(" -d, --deflate %s\n", _("Enable compression (default)"));
printf(" -D, --no-deflate %s\n", _("Disable compression"));
printf(" --force-dpd=INTERVAL %s\n", _("Set minimum Dead Peer Detection interval"));
printf(" -g, --usergroup=GROUP %s\n", _("Set login usergroup"));
printf(" -h, --help %s\n", _("Display help text"));
printf(" -i, --interface=IFNAME %s\n", _("Use IFNAME for tunnel interface"));
printf(" -l, --syslog %s\n", _("Use syslog for progress messages"));
printf(" -U, --setuid=USER %s\n", _("Drop privileges after connecting"));
printf(" --csd-user=USER %s\n", _("Drop privileges during CSD execution"));
printf(" --csd-wrapper=SCRIPT %s\n", _("Run SCRIPT instead of CSD binary"));
printf(" -m, --mtu=MTU %s\n", _("Request MTU from server"));
printf(" --base-mtu=MTU %s\n", _("Indicate path MTU to/from server"));
printf(" -p, --key-password=PASS %s\n", _("Set key passphrase or TPM SRK PIN"));
printf(" --key-password-from-fsid %s\n", _("Key passphrase is fsid of file system"));
printf(" -P, --proxy=URL %s\n", _("Set proxy server"));
printf(" --no-proxy %s\n", _("Disable proxy"));
printf(" --libproxy %s\n", _("Use libproxy to automatically configure proxy"));
#ifndef LIBPROXY_HDR
printf(" %s\n", _("(NOTE: libproxy disabled in this build)"));
#endif
printf(" -q, --quiet %s\n", _("Less output"));
printf(" -Q, --queue-len=LEN %s\n", _("Set packet queue limit to LEN pkts"));
printf(" -s, --script=SCRIPT %s\n", _("Shell command line for using a vpnc-compatible config script"));
printf(" %s: \"%s\"\n", _("default"), DEFAULT_VPNCSCRIPT);
printf(" -S, --script-tun %s\n", _("Pass traffic to 'script' program, not tun"));
printf(" -u, --user=NAME %s\n", _("Set login username"));
printf(" -V, --version %s\n", _("Report version number"));
printf(" -v, --verbose %s\n", _("More output"));
printf(" -x, --xmlconfig=CONFIG %s\n", _("XML config file"));
printf(" --authgroup=GROUP %s\n", _("Choose authentication login selection"));
printf(" --authenticate %s\n", _("Authenticate only and print login info"));
printf(" --cookieonly %s\n", _("Fetch webvpn cookie only; don't connect"));
printf(" --printcookie %s\n", _("Print webvpn cookie before connecting"));
printf(" --cafile=FILE %s\n", _("Cert file for server verification"));
printf(" --disable-ipv6 %s\n", _("Do not ask for IPv6 connectivity"));
printf(" --dtls-ciphers=LIST %s\n", _("OpenSSL ciphers to support for DTLS"));
printf(" --no-dtls %s\n", _("Disable DTLS"));
printf(" --no-http-keepalive %s\n", _("Disable HTTP connection re-use"));
printf(" --no-passwd %s\n", _("Disable password/SecurID authentication"));
printf(" --no-cert-check %s\n", _("Do not require server SSL cert to be valid"));
printf(" --non-inter %s\n", _("Do not expect user input; exit if it is required"));
printf(" --passwd-on-stdin %s\n", _("Read password from standard input"));
printf(" --reconnect-timeout %s\n", _("Connection retry timeout in seconds"));
printf(" --servercert=FINGERPRINT %s\n", _("Server's certificate SHA1 fingerprint"));
printf(" --useragent=STRING %s\n", _("HTTP header User-Agent: field"));
printf("\n");
helpmessage();
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;
}
static void handle_sigusr(int sig)
{
if (sig == SIGUSR1)
verbose = PRG_TRACE;
else if (sig == SIGUSR2)
verbose = PRG_INFO;
}
static FILE *config_file = NULL;
static int config_line_num = 0;
/* There are three ways to handle config_arg:
*
* 1. We only care about it transiently and it can be lost entirely
* (e.g. vpninfo->reconnect_timeout = atoi(config_arg);
* 2. We need to kep it, but it's a static string and will never be freed
* so when it's part of argv[] we can use it in place, but when it comes
* from a file we have to strdup() because otherwise it'll be overwritten.
* For this we use the keep_config_arg() macro below.
* 3. It may be freed during normal operation, so we have to use strdup()
* even when it's an option from argv[]. (e.g. vpninfo->cert_password).
*/
#define keep_config_arg() (config_file?strdup(config_arg):config_arg)
static int next_option(int argc, char **argv, char **config_arg)
{
/* These get re-used */
static char *line_buf = NULL;
static size_t line_size = 0;
ssize_t llen;
int opt, optlen;
struct option *this;
char *line;
int ate_equals = 0;
next:
if (!config_file) {
opt = getopt_long(argc, argv,
"bC:c:e:Ddg:hi:k:lpP:Q:qSs:U:u:Vvx:",
long_options, NULL);
*config_arg = optarg;
return opt;
}
llen = getline(&line_buf, &line_size, config_file);
if (llen < 0) {
if (feof(config_file)) {
fclose(config_file);
config_file = NULL;
goto next;
}
fprintf(stderr, _("Failed to get line from config file: %s\n"),
strerror(errno));
exit(1);
}
line = line_buf;
/* Strip the trailing newline (coping with DOS newlines) */
if (llen && line[llen-1] == '\n')
line[--llen] = 0;
if (llen && line[llen-1] == '\r')
line[--llen] = 0;
/* Skip and leading whitespace */
while (line[0] == ' ' || line[0] == '\t' || line[0] == '\r')
line++;
/* Ignore comments and empty lines */
if (!line[0] || line[0] == '#') {
config_line_num++;
goto next;
}
/* Try to match on a known option... naïvely. This could be improved. */
for (this = long_options; this->name; this++) {
optlen = strlen(this->name);
/* If the option isn't followed by whitespace or NUL, or
perhaps an equals sign if the option takes an argument,
then it's not a match */
if (!strncmp(this->name, line, optlen) &&
(!line[optlen] || line[optlen] == ' ' || line[optlen] == '\t' ||
line[optlen] == '='))
break;
}
if (!this->name) {
char *l;
for (l = line; *l && *l != ' ' && *l != '\t'; l++)
;
*l = 0;
fprintf(stderr, _("Unrecognised option at line %d: '%s'\n"),
config_line_num, line);
return '?';
}
line += optlen;
while (*line == ' ' || *line == '\t' ||
(*line == '=' && this->has_arg && !ate_equals && ++ate_equals))
line++;
if (!this->has_arg && *line) {
fprintf(stderr, _("Option '%s' does not take an argument at line %d\n"),
this->name, config_line_num);
return '?';
} else if (this->has_arg && !*line) {
fprintf(stderr, _("Option '%s' requires an argument at line %d\n"),
this->name, config_line_num);
return '?';
}
config_line_num++;
*config_arg = line;
return this->val;
}
int main(int argc, char **argv)
{
struct openconnect_info *vpninfo;
struct utsname utsbuf;
struct sigaction sa;
int use_syslog = 0;
char *urlpath = NULL;
char *proxy = getenv("https_proxy");
int autoproxy = 0;
uid_t uid = getuid();
int opt;
char *pidfile = NULL;
FILE *fp = NULL;
char *config_arg;
#ifdef ENABLE_NLS
bindtextdomain("openconnect", LOCALEDIR);
setlocale(LC_ALL, "");
#endif
if (strcmp(openconnect_version_str, openconnect_binary_version)) {
fprintf(stderr, _("WARNING: This version of openconnect is %s but\n"
" the libopenconnect library is %s\n"),
openconnect_binary_version, openconnect_version_str);
}
openconnect_init_ssl();
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");
vpninfo->mtu = 0;
vpninfo->deflate = 1;
vpninfo->dtls_attempt_period = 60;
vpninfo->max_qlen = 10;
vpninfo->reconnect_interval = RECONNECT_INTERVAL_MIN;
vpninfo->reconnect_timeout = 300;
vpninfo->uid_csd = 0;
vpninfo->uid_csd_given = 0;
vpninfo->validate_peer_cert = validate_peer_cert;
vpninfo->process_auth_form = process_auth_form;
vpninfo->cbdata = vpninfo;
vpninfo->cert_expire_warning = 60 * 86400;
vpninfo->vpnc_script = DEFAULT_VPNCSCRIPT;
vpninfo->cancel_fd = -1;
if (!uname(&utsbuf))
vpninfo->localname = utsbuf.nodename;
else
vpninfo->localname = "localhost";
while ((opt = next_option(argc, argv, &config_arg))) {
if (opt < 0)
break;
switch (opt) {
case OPT_CONFIGFILE:
if (config_file) {
fprintf(stderr, _("Cannot use 'config' option inside config file\n"));
exit(1);
}
config_file = fopen(config_arg, "r");
if (!config_file) {
fprintf(stderr, _("Cannot open config file '%s': %s\n"),
config_arg, strerror(errno));
exit(1);
}
config_line_num = 1;
/* The next option will come from the file... */
break;
case OPT_CAFILE:
vpninfo->cafile = keep_config_arg();
break;
case OPT_PIDFILE:
pidfile = keep_config_arg();
break;
case OPT_SERVERCERT:
vpninfo->servercert = keep_config_arg();
break;
case OPT_NO_DTLS:
vpninfo->dtls_attempt_period = 0;
break;
case OPT_COOKIEONLY:
cookieonly = 1;
break;
case OPT_PRINTCOOKIE:
cookieonly = 2;
break;
case OPT_AUTHENTICATE:
cookieonly = 3;
break;
case OPT_COOKIE_ON_STDIN:
read_stdin(&vpninfo->cookie);
/* If the cookie is empty, ignore it */
if (! *vpninfo->cookie) {
vpninfo->cookie = NULL;
}
break;
case OPT_PASSWORD_ON_STDIN:
read_stdin(&vpninfo->password);
break;
case OPT_NO_PASSWD:
vpninfo->nopasswd = 1;
break;
case OPT_NON_INTER:
non_inter = 1;
break;
case OPT_RECONNECT_TIMEOUT:
vpninfo->reconnect_timeout = atoi(config_arg);
break;
case OPT_DTLS_CIPHERS:
vpninfo->dtls_ciphers = keep_config_arg();
break;
case OPT_AUTHGROUP:
vpninfo->authgroup = keep_config_arg();
break;
case 'b':
background = 1;
break;
case 'C':
vpninfo->cookie = keep_config_arg();
break;
case 'c':
vpninfo->cert = strdup(config_arg);
break;
case 'e':
vpninfo->cert_expire_warning = 86400 * atoi(config_arg);
break;
case 'k':
vpninfo->sslkey = strdup(config_arg);
break;
case 'd':
vpninfo->deflate = 1;
break;
case 'D':
vpninfo->deflate = 0;
break;
case 'g':
free(urlpath);
urlpath = strdup(config_arg);
break;
case 'h':
usage();
case 'i':
vpninfo->ifname = keep_config_arg();
break;
case 'l':
use_syslog = 1;
break;
case 'm':
vpninfo->mtu = atol(config_arg);
if (vpninfo->mtu < 576) {
fprintf(stderr, _("MTU %d too small\n"), vpninfo->mtu);
vpninfo->mtu = 576;
}
break;
case OPT_BASEMTU:
vpninfo->basemtu = atol(config_arg);
if (vpninfo->basemtu < 576) {
fprintf(stderr, _("MTU %d too small\n"), vpninfo->basemtu);
vpninfo->basemtu = 576;
}
break;
case 'p':
vpninfo->cert_password = strdup(config_arg);
break;
case 'P':
proxy = keep_config_arg();
autoproxy = 0;
break;
case OPT_NO_PROXY:
autoproxy = 0;
proxy = NULL;
case OPT_LIBPROXY:
autoproxy = 1;
proxy = NULL;
break;
case OPT_NO_HTTP_KEEPALIVE:
fprintf(stderr,
_("Disabling all HTTP connection re-use due to --no-http-keepalive option.\n"
"If this helps, please report to <openconnect-devel@lists.infradead.org>.\n"));
vpninfo->no_http_keepalive = 1;
break;
case OPT_NO_CERT_CHECK:
nocertcheck = 1;
break;
case 's':
vpninfo->vpnc_script = keep_config_arg();
break;
case 'S':
vpninfo->script_tun = 1;
break;
case 'u':
vpninfo->username = keep_config_arg();
break;
case 'U': {
char *strend;
uid = strtol(config_arg, &strend, 0);
if (strend[0]) {
struct passwd *pw = getpwnam(config_arg);
if (!pw) {
fprintf(stderr, _("Invalid user \"%s\"\n"),
config_arg);
exit(1);
}
uid = pw->pw_uid;
}
break;
}
case OPT_CSD_USER: {
char *strend;
vpninfo->uid_csd = strtol(config_arg, &strend, 0);
if (strend[0]) {
struct passwd *pw = getpwnam(config_arg);
if (!pw) {
fprintf(stderr, _("Invalid user \"%s\"\n"),
config_arg);
exit(1);
}
vpninfo->uid_csd = pw->pw_uid;
}
vpninfo->uid_csd_given = 1;
break;
}
case OPT_CSD_WRAPPER:
vpninfo->csd_wrapper = keep_config_arg();
break;
case OPT_DISABLE_IPV6:
vpninfo->disable_ipv6 = 1;
break;
case 'Q':
vpninfo->max_qlen = atol(config_arg);
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_str);
print_build_opts();
exit(0);
case 'x':
vpninfo->xmlconfig = keep_config_arg();
vpninfo->write_new_config = write_new_config;
break;
case OPT_KEY_PASSWORD_FROM_FSID:
do_passphrase_from_fsid = 1;
break;
case OPT_USERAGENT:
free(vpninfo->useragent);
vpninfo->useragent = strdup(config_arg);
break;
case OPT_FORCE_DPD:
vpninfo->dtls_times.dpd = vpninfo->ssl_times.dpd = atoi(config_arg);
break;
default:
usage();
}
}
if (optind < argc - 1) {
fprintf(stderr, _("Too many arguments on command line\n"));
usage();
} else if (optind > argc - 1) {
fprintf(stderr, _("No server specified\n"));
usage();
}
if (!vpninfo->sslkey)
vpninfo->sslkey = vpninfo->cert;
vpninfo->progress = write_progress;
if (autoproxy) {
#ifdef LIBPROXY_HDR
vpninfo->proxy_factory = px_proxy_factory_new();
#else
fprintf(stderr, _("This version of openconnect was built without libproxy support\n"));
exit(1);
#endif
}
if (proxy && openconnect_set_http_proxy(vpninfo, strdup(proxy)))
exit(1);
if (use_syslog) {
#ifndef ANDROID
openlog("openconnect", LOG_PID, LOG_DAEMON);
#endif
vpninfo->progress = syslog_progress;
}
memset(&sa, 0, sizeof(sa));
sa.sa_handler = handle_sigusr;
sigaction(SIGUSR1, &sa, NULL);
sigaction(SIGUSR2, &sa, NULL);
if (vpninfo->sslkey && do_passphrase_from_fsid)
openconnect_passphrase_from_fsid(vpninfo);
if (config_lookup_host(vpninfo, argv[optind]))
exit(1);
if (!vpninfo->hostname) {
char *url = strdup(argv[optind]);
if (openconnect_parse_url(vpninfo, url))
exit(1);
free(url);
}
/* Historically, the path in the URL superseded the one in the
* --usergroup argument, just because of the order in which they
* were processed. Preserve that behaviour. */
if (urlpath && !vpninfo->urlpath) {
vpninfo->urlpath = urlpath;
urlpath = NULL;
}
free(urlpath);
#ifdef SSL_UI
set_openssl_ui();
#endif
if (!vpninfo->cookie && openconnect_obtain_cookie(vpninfo)) {
fprintf(stderr, _("Failed to obtain WebVPN cookie\n"));
exit(1);
}
if (cookieonly == 3) {
/* --authenticate */
printf("COOKIE='%s'\n", vpninfo->cookie);
printf("HOST='%s'\n", vpninfo->hostname);
if (vpninfo->peer_cert) {
char buf[41] = {0, };
openconnect_get_cert_sha1(vpninfo, vpninfo->peer_cert, buf);
printf("FINGERPRINT='%s'\n", buf);
}
openconnect_vpninfo_free(vpninfo);
exit(0);
} else if (cookieonly) {
printf("%s\n", vpninfo->cookie);
if (cookieonly == 1) {
/* We use cookieonly=2 for 'print it and continue' */
openconnect_vpninfo_free(vpninfo);
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 %ld\n"),
(long)uid);
exit(1);
}
}
if (vpninfo->dtls_attempt_period && setup_dtls(vpninfo))
fprintf(stderr, _("Set up DTLS failed; using SSL instead\n"));
vpn_progress(vpninfo, PRG_INFO,
_("Connected %s as %s%s%s, using %s\n"), vpninfo->ifname,
vpninfo->vpn_addr?:"",
(vpninfo->vpn_addr6 && vpninfo->vpn_addr)?" + ":"",
vpninfo->vpn_addr6?:"",
(vpninfo->dtls_fd == -1) ?
(vpninfo->deflate ? "SSL + deflate" : "SSL")
: "DTLS");
if (!vpninfo->vpnc_script) {
vpn_progress(vpninfo, PRG_INFO,
_("No --script argument provided; DNS and routing are not configured\n"));
vpn_progress(vpninfo, PRG_INFO,
_("See http://www.infradead.org/openconnect/vpnc-script.html\n"));
}
if (background) {
int pid;
/* Open the pidfile before forking, so we can report errors
more sanely. It's *possible* that we'll fail to write to
it, but very unlikely. */
if (pidfile != NULL) {
fp = fopen(pidfile, "w");
if (!fp) {
fprintf(stderr, _("Failed to open '%s' for write: %s\n"),
pidfile, strerror(errno));
exit(1);
}
}
if ((pid = fork())) {
if (fp) {
fprintf(fp, "%d\n", pid);
fclose(fp);
}
vpn_progress(vpninfo, PRG_INFO,
_("Continuing in background; pid %d\n"),
pid);
exit(0);
}
if (fp)
fclose(fp);
}
vpn_mainloop(vpninfo);
if (fp)
unlink(pidfile);
exit(1);
}
static int write_new_config(void *_vpninfo, char *buf, int buflen)
{
struct openconnect_info *vpninfo = _vpninfo;
int config_fd;
int err;
config_fd = open(vpninfo->xmlconfig, O_WRONLY|O_TRUNC|O_CREAT, 0644);
if (config_fd < 0) {
err = errno;
fprintf(stderr, _("Failed to open %s for write: %s\n"),
vpninfo->xmlconfig, strerror(err));
return -err;
}
/* FIXME: We should actually write to a new tempfile, then rename */
if(write(config_fd, buf, buflen) != buflen) {
err = errno;
fprintf(stderr, _("Failed to write config to %s: %s\n"),
vpninfo->xmlconfig, strerror(err));
return -err;
}
return 0;
}
void write_progress(void *_vpninfo, int level, const char *fmt, ...)
{
FILE *outf = level ? stdout : stderr;
va_list args;
if (cookieonly)
outf = stderr;
if (verbose >= level) {
va_start(args, fmt);
vfprintf(outf, fmt, args);
va_end(args);
fflush(outf);
}
}
#ifdef ANDROID
void syslog_progress(void *_vpninfo, int level, const char *fmt, ...)
{
static int l[4] = {
ANDROID_LOG_ERROR, /* PRG_ERR */
ANDROID_LOG_INFO, /* PRG_INFO */
ANDROID_LOG_DEBUG, /* PRG_DEBUG */
ANDROID_LOG_DEBUG /* PRG_TRACE */
};
va_list args, args2;
if (verbose >= level) {
va_start(args, fmt);
va_copy(args2, args);
__android_log_vprint(l[level], "openconnect", fmt, args);
/* Android wants it to stderr too, so the GUI can scrape
it and display it as well as going to syslog */
vfprintf(stderr, fmt, args2);
va_end(args);
va_end(args2);
}
}
#else /* !ANDROID */
void syslog_progress(void *_vpninfo, 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);
}
}
#endif
struct accepted_cert {
struct accepted_cert *next;
char fingerprint[SHA1_SIZE * 2 + 1];
char host[0];
} *accepted_certs;
static int validate_peer_cert(void *_vpninfo, OPENCONNECT_X509 *peer_cert,
const char *reason)
{
struct openconnect_info *vpninfo = _vpninfo;
char fingerprint[SHA1_SIZE * 2 + 1];
struct accepted_cert *this;
int ret;
if (nocertcheck)
return 0;
ret = openconnect_get_cert_sha1(vpninfo, peer_cert, fingerprint);
if (ret)
return ret;
for (this = accepted_certs; this; this = this->next) {
if (!strcasecmp(this->host, vpninfo->hostname) &&
!strcasecmp(this->fingerprint, fingerprint))
return 0;
}
while (1) {
char buf[80];
char *details;
char *p;
fprintf(stderr, _("\nCertificate from VPN server \"%s\" failed verification.\n"
"Reason: %s\n"), vpninfo->hostname, reason);
if (non_inter)
return -EINVAL;
fprintf(stderr, _("Enter '%s' to accept, '%s' to abort; anything else to view: "),
_("yes"), _("no"));
if (!fgets(buf, sizeof(buf), stdin))
return -EINVAL;
p = strchr(buf, '\n');
if (p)
*p = 0;
if (!strcasecmp(buf, _("yes"))) {
struct accepted_cert *newcert = malloc(sizeof(*newcert) +
strlen(vpninfo->hostname) + 1);
if (newcert) {
newcert->next = accepted_certs;
accepted_certs = newcert;
strcpy(newcert->fingerprint, fingerprint);
strcpy(newcert->host, vpninfo->hostname);
}
return 0;
}
if (!strcasecmp(buf, _("no")))
return -EINVAL;
details = openconnect_get_cert_details(vpninfo, peer_cert);
fputs(details, stderr);
free(details);
fprintf(stderr, _("SHA1 fingerprint: %s\n"), fingerprint);
}
}
/* Return value:
* < 0, on error