vpn/plugins/vpnc.c

   1 /*
   2  *
   3  *  ConnMan VPN daemon
   4  *
   5  *  Copyright (C) 2010,2013  BMW Car IT GmbH. All rights reserved.
   6  *  Copyright (C) 2010,2012-2013  Intel Corporation. All rights reserved.
   7  *
   8  *  This program is free software; you can redistribute it and/or modify
   9  *  it under the terms of the GNU General Public License version 2 as
  10  *  published by the Free Software Foundation.
  11  *
  12  *  This program is distributed in the hope that it will be useful,
  13  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  *  GNU General Public License for more details.
  16  *
  17  *  You should have received a copy of the GNU General Public License
  18  *  along with this program; if not, write to the Free Software
  19  *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  20  *
  21  */
  22
  23 #ifdef HAVE_CONFIG_H
  24 #include <config.h>
  25 #endif
  26
  27 #include <string.h>
  28 #include <errno.h>
  29 #include <unistd.h>
  30 #include <stdio.h>
  31 #include <net/if.h>
  32
  33 #include <glib.h>
  34
  35 #define CONNMAN_API_SUBJECT_TO_CHANGE
  36 #include <connman/plugin.h>
  37 #include <connman/log.h>
  38 #include <connman/task.h>
  39 #include <connman/ipconfig.h>
  40 #include <connman/dbus.h>
  41
  42 #include "../vpn-provider.h"
  43
  44 #include "vpn.h"
  45
  46 #define ARRAY_SIZE(a) (sizeof(a)/sizeof(a[0]))
  47
  48 static DBusConnection *connection;
  49
  50 enum {
  51         OPT_STRING = 1,
  52         OPT_BOOLEAN = 2,
  53 };
  54
  55 struct {
  56         const char *cm_opt;
  57         const char *vpnc_opt;
  58         const char *vpnc_default;
  59         int type;
  60         bool cm_save;
  61 } vpnc_options[] = {
  62         { "Host", "IPSec gateway", NULL, OPT_STRING, true },
  63         { "VPNC.IPSec.ID", "IPSec ID", NULL, OPT_STRING, true },
  64         { "VPNC.IPSec.Secret", "IPSec secret", NULL, OPT_STRING, false },
  65         { "VPNC.Xauth.Username", "Xauth username", NULL, OPT_STRING, false },
  66         { "VPNC.Xauth.Password", "Xauth password", NULL, OPT_STRING, false },
  67         { "VPNC.IKE.Authmode", "IKE Authmode", NULL, OPT_STRING, true },
  68         { "VPNC.IKE.DHGroup", "IKE DH Group", NULL, OPT_STRING, true },
  69         { "VPNC.PFS", "Perfect Forward Secrecy", NULL, OPT_STRING, true },
  70         { "VPNC.Domain", "Domain", NULL, OPT_STRING, true },
  71         { "VPNC.Vendor", "Vendor", NULL, OPT_STRING, true },
  72         { "VPNC.LocalPort", "Local Port", "0", OPT_STRING, true, },
  73         { "VPNC.CiscoPort", "Cisco UDP Encapsulation Port", "0", OPT_STRING,
  74                                                                         true },
  75         { "VPNC.AppVersion", "Application Version", NULL, OPT_STRING, true },
  76         { "VPNC.NATTMode", "NAT Traversal Mode", "cisco-udp", OPT_STRING,
  77                                                                         true },
  78         { "VPNC.DPDTimeout", "DPD idle timeout (our side)", NULL, OPT_STRING,
  79                                                                         true },
  80         { "VPNC.SingleDES", "Enable Single DES", NULL, OPT_BOOLEAN, true },
  81         { "VPNC.NoEncryption", "Enable no encryption", NULL, OPT_BOOLEAN,
  82                                                                         true },
  83 };
  84
  85 static int vc_notify(DBusMessage *msg, struct vpn_provider *provider)
  86 {
  87         DBusMessageIter iter, dict;
  88         char *address = NULL, *netmask = NULL, *gateway = NULL;
  89         struct connman_ipaddress *ipaddress;
  90         const char *reason, *key, *value;
  91
  92         dbus_message_iter_init(msg, &iter);
  93
  94         dbus_message_iter_get_basic(&iter, &reason);
  95         dbus_message_iter_next(&iter);
  96
  97         if (!provider) {
  98                 connman_error("No provider found");
  99                 return VPN_STATE_FAILURE;
 100         }
 101
 102         if (strcmp(reason, "connect"))
 103                 return VPN_STATE_DISCONNECT;
 104
 105         dbus_message_iter_recurse(&iter, &dict);
 106
 107         while (dbus_message_iter_get_arg_type(&dict) == DBUS_TYPE_DICT_ENTRY) {
 108                 DBusMessageIter entry;
 109
 110                 dbus_message_iter_recurse(&dict, &entry);
 111                 dbus_message_iter_get_basic(&entry, &key);
 112                 dbus_message_iter_next(&entry);
 113                 dbus_message_iter_get_basic(&entry, &value);
 114
 115                 DBG("%s = %s", key, value);
 116
 117                 if (!strcmp(key, "VPNGATEWAY"))
 118                         gateway = g_strdup(value);
 119
 120                 if (!strcmp(key, "INTERNAL_IP4_ADDRESS"))
 121                         address = g_strdup(value);
 122
 123                 if (!strcmp(key, "INTERNAL_IP4_NETMASK"))
 124                         netmask = g_strdup(value);
 125
 126                 if (!strcmp(key, "INTERNAL_IP4_DNS"))
 127                         vpn_provider_set_nameservers(provider, value);
 128
 129                 if (!strcmp(key, "CISCO_DEF_DOMAIN"))
 130                         vpn_provider_set_domain(provider, value);
 131
 132                 if (g_str_has_prefix(key, "CISCO_SPLIT_INC") ||
 133                         g_str_has_prefix(key, "CISCO_IPV6_SPLIT_INC"))
 134                         vpn_provider_append_route(provider, key, value);
 135
 136                 dbus_message_iter_next(&dict);
 137         }
 138
 139
 140         ipaddress = connman_ipaddress_alloc(AF_INET);
 141         if (!ipaddress) {
 142                 g_free(address);
 143                 g_free(netmask);
 144                 g_free(gateway);
 145
 146                 return VPN_STATE_FAILURE;
 147         }
 148
 149         connman_ipaddress_set_ipv4(ipaddress, address, netmask, gateway);
 150         vpn_provider_set_ipaddress(provider, ipaddress);
 151
 152         g_free(address);
 153         g_free(netmask);
 154         g_free(gateway);
 155         connman_ipaddress_free(ipaddress);
 156
 157         return VPN_STATE_CONNECT;
 158 }
 159
 160 static ssize_t full_write(int fd, const void *buf, size_t len)
 161 {
 162         ssize_t byte_write;
 163
 164         while (len) {
 165                 byte_write = write(fd, buf, len);
 166                 if (byte_write < 0) {
 167                         connman_error("failed to write config to vpnc: %s\n",
 168                                         strerror(errno));
 169                         return byte_write;
 170                 }
 171                 len -= byte_write;
 172                 buf += byte_write;
 173         }
 174
 175         return 0;
 176 }
 177
 178 static ssize_t write_option(int fd, const char *key, const char *value)
 179 {
 180         gchar *buf;
 181         ssize_t ret = 0;
 182
 183         if (key && value) {
 184                 buf = g_strdup_printf("%s %s\n", key, value);
 185                 ret = full_write(fd, buf, strlen(buf));
 186
 187                 g_free(buf);
 188         }
 189
 190         return ret;
 191 }
 192
 193 static ssize_t write_bool_option(int fd, const char *key, const char *value)
 194 {
 195         gchar *buf;
 196         ssize_t ret = 0;
 197
 198         if (key && value) {
 199                 if (strcasecmp(value, "yes") == 0 ||
 200                                 strcasecmp(value, "true") == 0 ||
 201                                 strcmp(value, "1") == 0) {
 202                         buf = g_strdup_printf("%s\n", key);
 203                         ret = full_write(fd, buf, strlen(buf));
 204
 205                         g_free(buf);
 206                 }
 207         }
 208
 209         return ret;
 210 }
 211
 212 static int vc_write_config_data(struct vpn_provider *provider, int fd)
 213 {
 214         const char *opt_s;
 215         int i;
 216
 217         for (i = 0; i < (int)ARRAY_SIZE(vpnc_options); i++) {
 218                 opt_s = vpn_provider_get_string(provider,
 219                                         vpnc_options[i].cm_opt);
 220                 if (!opt_s)
 221                         opt_s = vpnc_options[i].vpnc_default;
 222
 223                 if (!opt_s)
 224                         continue;
 225
 226                 if (vpnc_options[i].type == OPT_STRING) {
 227                         if (write_option(fd,
 228                                         vpnc_options[i].vpnc_opt, opt_s) < 0)
 229                                 return -EIO;
 230                 } else if (vpnc_options[i].type == OPT_BOOLEAN) {
 231                         if (write_bool_option(fd,
 232                                         vpnc_options[i].vpnc_opt, opt_s) < 0)
 233                                 return -EIO;
 234                 }
 235
 236         }
 237
 238         return 0;
 239 }
 240
 241 static int vc_save(struct vpn_provider *provider, GKeyFile *keyfile)
 242 {
 243         const char *option;
 244         int i;
 245
 246         for (i = 0; i < (int)ARRAY_SIZE(vpnc_options); i++) {
 247                 if (strncmp(vpnc_options[i].cm_opt, "VPNC.", 5) == 0) {
 248
 249                         if (!vpnc_options[i].cm_save)
 250                                 continue;
 251
 252                         option = vpn_provider_get_string(provider,
 253                                                         vpnc_options[i].cm_opt);
 254                         if (!option)
 255                                 continue;
 256
 257                         g_key_file_set_string(keyfile,
 258                                         vpn_provider_get_save_group(provider),
 259                                         vpnc_options[i].cm_opt, option);
 260                 }
 261         }
 262         return 0;
 263 }
 264
 265 static int vc_connect(struct vpn_provider *provider,
 266                         struct connman_task *task, const char *if_name,
 267                         vpn_provider_connect_cb_t cb, const char *dbus_sender,
 268                         void *user_data)
 269 {
 270         const char *option;
 271         int err = 0, fd;
 272
 273         option = vpn_provider_get_string(provider, "Host");
 274         if (!option) {
 275                 connman_error("Host not set; cannot enable VPN");
 276                 err = -EINVAL;
 277                 goto done;
 278         }
 279         option = vpn_provider_get_string(provider, "VPNC.IPSec.ID");
 280         if (!option) {
 281                 connman_error("Group not set; cannot enable VPN");
 282                 err = -EINVAL;
 283                 goto done;
 284         }
 285
 286         connman_task_add_argument(task, "--non-inter", NULL);
 287         connman_task_add_argument(task, "--no-detach", NULL);
 288
 289         connman_task_add_argument(task, "--ifname", if_name);
 290         connman_task_add_argument(task, "--ifmode", "tun");
 291
 292         connman_task_add_argument(task, "--script",
 293                                 SCRIPTDIR "/openconnect-script");
 294
 295         option = vpn_provider_get_string(provider, "VPNC.Debug");
 296         if (option)
 297                 connman_task_add_argument(task, "--debug", option);
 298
 299         connman_task_add_argument(task, "-", NULL);
 300
 301         err = connman_task_run(task, vpn_died, provider,
 302                                 &fd, NULL, NULL);
 303         if (err < 0) {
 304                 connman_error("vpnc failed to start");
 305                 err = -EIO;
 306                 goto done;
 307         }
 308
 309         err = vc_write_config_data(provider, fd);
 310
 311         close(fd);
 312
 313 done:
 314         if (cb)
 315                 cb(provider, user_data, err);
 316
 317         return err;
 318 }
 319
 320 static int vc_error_code(struct vpn_provider *provider, int exit_code)
 321 {
 322         switch (exit_code) {
 323         case 1:
 324                 return VPN_PROVIDER_ERROR_CONNECT_FAILED;
 325         case 2:
 326                 return VPN_PROVIDER_ERROR_LOGIN_FAILED;
 327         default:
 328                 return VPN_PROVIDER_ERROR_UNKNOWN;
 329         }
 330 }
 331
 332 static struct vpn_driver vpn_driver = {
 333         .notify         = vc_notify,
 334         .connect        = vc_connect,
 335         .error_code     = vc_error_code,
 336         .save           = vc_save,
 337 };
 338
 339 static int vpnc_init(void)
 340 {
 341         connection = connman_dbus_get_connection();
 342
 343         return vpn_register("vpnc", &vpn_driver, VPNC);
 344 }
 345
 346 static void vpnc_exit(void)
 347 {
 348         vpn_unregister("vpnc");
 349
 350         dbus_connection_unref(connection);
 351 }
 352
 353 CONNMAN_PLUGIN_DEFINE(vpnc, "vpnc plugin", VERSION,
 354         CONNMAN_PLUGIN_PRIORITY_DEFAULT, vpnc_init, vpnc_exit)