vpn/plugins/openvpn.c

   1 /*
   2  *
   3  *  ConnMan VPN daemon
   4  *
   5  *  Copyright (C) 2010-2014  BMW Car IT GmbH.
   6  *
   7  *  This program is free software; you can redistribute it and/or modify
   8  *  it under the terms of the GNU General Public License version 2 as
   9  *  published by the Free Software Foundation.
  10  *
  11  *  This program is distributed in the hope that it will be useful,
  12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *  GNU General Public License for more details.
  15  *
  16  *  You should have received a copy of the GNU General Public License
  17  *  along with this program; if not, write to the Free Software
  18  *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  19  *
  20  */
  21
  22 #ifdef HAVE_CONFIG_H
  23 #include <config.h>
  24 #endif
  25
  26 #include <stdlib.h>
  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/dbus.h>
  40 #include <connman/ipconfig.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 struct {
  51         const char *cm_opt;
  52         const char *ov_opt;
  53         char       has_value;
  54 } ov_options[] = {
  55         { "Host", "--remote", 1 },
  56         { "OpenVPN.CACert", "--ca", 1 },
  57         { "OpenVPN.Cert", "--cert", 1 },
  58         { "OpenVPN.Key", "--key", 1 },
  59         { "OpenVPN.MTU", "--mtu", 1 },
  60         { "OpenVPN.NSCertType", "--ns-cert-type", 1 },
  61         { "OpenVPN.Proto", "--proto", 1 },
  62         { "OpenVPN.Port", "--port", 1 },
  63         { "OpenVPN.AuthUserPass", "--auth-user-pass", 1 },
  64         { "OpenVPN.AskPass", "--askpass", 1 },
  65         { "OpenVPN.AuthNoCache", "--auth-nocache", 0 },
  66         { "OpenVPN.TLSRemote", "--tls-remote", 1 },
  67         { "OpenVPN.TLSAuth", NULL, 1 },
  68         { "OpenVPN.TLSAuthDir", NULL, 1 },
  69         { "OpenVPN.Cipher", "--cipher", 1 },
  70         { "OpenVPN.Auth", "--auth", 1 },
  71         { "OpenVPN.CompLZO", "--comp-lzo", 0 },
  72         { "OpenVPN.RemoteCertTls", "--remote-cert-tls", 1 },
  73         { "OpenVPN.ConfigFile", "--config", 1 },
  74 };
  75
  76 struct nameserver_entry {
  77         int id;
  78         char *nameserver;
  79 };
  80
  81 static struct nameserver_entry *ov_append_dns_entries(const char *key,
  82                                                 const char *value)
  83 {
  84         struct nameserver_entry *entry = NULL;
  85         gchar **options;
  86
  87         if (!g_str_has_prefix(key, "foreign_option_"))
  88                 return NULL;
  89
  90         options = g_strsplit(value, " ", 3);
  91         if (options[0] &&
  92                 !strcmp(options[0], "dhcp-option") &&
  93                         options[1] &&
  94                         !strcmp(options[1], "DNS") &&
  95                                 options[2]) {
  96
  97                 entry = g_try_new(struct nameserver_entry, 1);
  98                 if (!entry)
  99                         return NULL;
 100
 101                 entry->nameserver = g_strdup(options[2]);
 102                 entry->id = atoi(key + 15); /* foreign_option_XXX */
 103         }
 104
 105         g_strfreev(options);
 106
 107         return entry;
 108 }
 109
 110 static char *ov_get_domain_name(const char *key, const char *value)
 111 {
 112         gchar **options;
 113         char *domain = NULL;
 114
 115         if (!g_str_has_prefix(key, "foreign_option_"))
 116                 return NULL;
 117
 118         options = g_strsplit(value, " ", 3);
 119         if (options[0] &&
 120                 !strcmp(options[0], "dhcp-option") &&
 121                         options[1] &&
 122                         !strcmp(options[1], "DOMAIN") &&
 123                                 options[2]) {
 124
 125                 domain = g_strdup(options[2]);
 126         }
 127
 128         g_strfreev(options);
 129
 130         return domain;
 131 }
 132
 133 static gint cmp_ns(gconstpointer a, gconstpointer b)
 134 {
 135         struct nameserver_entry *entry_a = (struct nameserver_entry *)a;
 136         struct nameserver_entry *entry_b = (struct nameserver_entry *)b;
 137
 138         if (entry_a->id < entry_b->id)
 139                 return -1;
 140
 141         if (entry_a->id > entry_b->id)
 142                 return 1;
 143
 144         return 0;
 145 }
 146
 147 static void free_ns_entry(gpointer data)
 148 {
 149         struct nameserver_entry *entry = data;
 150
 151         g_free(entry->nameserver);
 152         g_free(entry);
 153 }
 154
 155 static int ov_notify(DBusMessage *msg, struct vpn_provider *provider)
 156 {
 157         DBusMessageIter iter, dict;
 158         const char *reason, *key, *value;
 159         char *address = NULL, *gateway = NULL, *peer = NULL;
 160         struct connman_ipaddress *ipaddress;
 161         GSList *nameserver_list = NULL;
 162
 163         dbus_message_iter_init(msg, &iter);
 164
 165         dbus_message_iter_get_basic(&iter, &reason);
 166         dbus_message_iter_next(&iter);
 167
 168         if (!provider) {
 169                 connman_error("No provider found");
 170                 return VPN_STATE_FAILURE;
 171         }
 172
 173         if (strcmp(reason, "up"))
 174                 return VPN_STATE_DISCONNECT;
 175
 176         dbus_message_iter_recurse(&iter, &dict);
 177
 178         while (dbus_message_iter_get_arg_type(&dict) == DBUS_TYPE_DICT_ENTRY) {
 179                 struct nameserver_entry *ns_entry = NULL;
 180                 DBusMessageIter entry;
 181
 182                 dbus_message_iter_recurse(&dict, &entry);
 183                 dbus_message_iter_get_basic(&entry, &key);
 184                 dbus_message_iter_next(&entry);
 185                 dbus_message_iter_get_basic(&entry, &value);
 186
 187                 DBG("%s = %s", key, value);
 188
 189                 if (!strcmp(key, "trusted_ip"))
 190                         gateway = g_strdup(value);
 191
 192                 if (!strcmp(key, "ifconfig_local"))
 193                         address = g_strdup(value);
 194
 195                 if (!strcmp(key, "ifconfig_remote"))
 196                         peer = g_strdup(value);
 197
 198                 if (g_str_has_prefix(key, "route_"))
 199                         vpn_provider_append_route(provider, key, value);
 200
 201                 if ((ns_entry = ov_append_dns_entries(key, value)))
 202                         nameserver_list = g_slist_prepend(nameserver_list,
 203                                                         ns_entry);
 204                 else {
 205                         char *domain = ov_get_domain_name(key, value);
 206                         if (domain) {
 207                                 vpn_provider_set_domain(provider, domain);
 208                                 g_free(domain);
 209                         }
 210                 }
 211
 212                 dbus_message_iter_next(&dict);
 213         }
 214
 215         ipaddress = connman_ipaddress_alloc(AF_INET);
 216         if (!ipaddress) {
 217                 g_slist_free_full(nameserver_list, free_ns_entry);
 218                 g_free(address);
 219                 g_free(gateway);
 220                 g_free(peer);
 221
 222                 return VPN_STATE_FAILURE;
 223         }
 224
 225         connman_ipaddress_set_ipv4(ipaddress, address, NULL, gateway);
 226         connman_ipaddress_set_peer(ipaddress, peer);
 227         vpn_provider_set_ipaddress(provider, ipaddress);
 228
 229         if (nameserver_list) {
 230                 char *nameservers = NULL;
 231                 GSList *tmp;
 232
 233                 nameserver_list = g_slist_sort(nameserver_list, cmp_ns);
 234                 for (tmp = nameserver_list; tmp;
 235                                                 tmp = g_slist_next(tmp)) {
 236                         struct nameserver_entry *ns = tmp->data;
 237
 238                         if (!nameservers) {
 239                                 nameservers = g_strdup(ns->nameserver);
 240                         } else {
 241                                 char *str;
 242                                 str = g_strjoin(" ", nameservers,
 243                                                 ns->nameserver, NULL);
 244                                 g_free(nameservers);
 245                                 nameservers = str;
 246                         }
 247                 }
 248
 249                 g_slist_free_full(nameserver_list, free_ns_entry);
 250
 251                 vpn_provider_set_nameservers(provider, nameservers);
 252
 253                 g_free(nameservers);
 254         }
 255
 256         g_free(address);
 257         g_free(gateway);
 258         g_free(peer);
 259         connman_ipaddress_free(ipaddress);
 260
 261         return VPN_STATE_CONNECT;
 262 }
 263
 264 static int ov_save(struct vpn_provider *provider, GKeyFile *keyfile)
 265 {
 266         const char *option;
 267         int i;
 268
 269         for (i = 0; i < (int)ARRAY_SIZE(ov_options); i++) {
 270                 if (strncmp(ov_options[i].cm_opt, "OpenVPN.", 8) == 0) {
 271                         option = vpn_provider_get_string(provider,
 272                                                         ov_options[i].cm_opt);
 273                         if (!option)
 274                                 continue;
 275
 276                         g_key_file_set_string(keyfile,
 277                                         vpn_provider_get_save_group(provider),
 278                                         ov_options[i].cm_opt, option);
 279                 }
 280         }
 281         return 0;
 282 }
 283
 284 static int task_append_config_data(struct vpn_provider *provider,
 285                                         struct connman_task *task)
 286 {
 287         const char *option;
 288         int i;
 289
 290         for (i = 0; i < (int)ARRAY_SIZE(ov_options); i++) {
 291                 if (!ov_options[i].ov_opt)
 292                         continue;
 293
 294                 option = vpn_provider_get_string(provider,
 295                                         ov_options[i].cm_opt);
 296                 if (!option)
 297                         continue;
 298
 299                 if (connman_task_add_argument(task,
 300                                 ov_options[i].ov_opt,
 301                                 ov_options[i].has_value ? option : NULL) < 0) {
 302                         return -EIO;
 303                 }
 304         }
 305
 306         return 0;
 307 }
 308
 309 static int ov_connect(struct vpn_provider *provider,
 310                         struct connman_task *task, const char *if_name,
 311                         vpn_provider_connect_cb_t cb, const char *dbus_sender,
 312                         void *user_data)
 313 {
 314         const char *option;
 315         int err = 0, fd;
 316
 317         option = vpn_provider_get_string(provider, "Host");
 318         if (!option) {
 319                 connman_error("Host not set; cannot enable VPN");
 320                 return -EINVAL;
 321         }
 322
 323         task_append_config_data(provider, task);
 324
 325         option = vpn_provider_get_string(provider, "OpenVPN.ConfigFile");
 326         if (!option) {
 327                 /*
 328                  * Set some default options if user has no config file.
 329                  */
 330                 option = vpn_provider_get_string(provider, "OpenVPN.TLSAuth");
 331                 if (option) {
 332                         connman_task_add_argument(task, "--tls-auth", option);
 333                         option = vpn_provider_get_string(provider,
 334                                                         "OpenVPN.TLSAuthDir");
 335                         if (option)
 336                                 connman_task_add_argument(task, option, NULL);
 337                 }
 338
 339                 connman_task_add_argument(task, "--nobind", NULL);
 340                 connman_task_add_argument(task, "--persist-key", NULL);
 341                 connman_task_add_argument(task, "--client", NULL);
 342         }
 343
 344         connman_task_add_argument(task, "--syslog", NULL);
 345
 346         connman_task_add_argument(task, "--script-security", "2");
 347
 348         connman_task_add_argument(task, "--up",
 349                                         SCRIPTDIR "/openvpn-script");
 350         connman_task_add_argument(task, "--up-restart", NULL);
 351
 352         connman_task_add_argument(task, "--setenv", NULL);
 353         connman_task_add_argument(task, "CONNMAN_BUSNAME",
 354                                         dbus_bus_get_unique_name(connection));
 355
 356         connman_task_add_argument(task, "--setenv", NULL);
 357         connman_task_add_argument(task, "CONNMAN_INTERFACE",
 358                                         CONNMAN_TASK_INTERFACE);
 359
 360         connman_task_add_argument(task, "--setenv", NULL);
 361         connman_task_add_argument(task, "CONNMAN_PATH",
 362                                         connman_task_get_path(task));
 363
 364         connman_task_add_argument(task, "--dev", if_name);
 365         connman_task_add_argument(task, "--dev-type", "tun");
 366
 367         connman_task_add_argument(task, "--persist-tun", NULL);
 368
 369 #if !defined TIZEN_EXT
 370         connman_task_add_argument(task, "--route-noexec", NULL);
 371         connman_task_add_argument(task, "--ifconfig-noexec", NULL);
 372 #endif
 373
 374         /*
 375          * Disable client restarts because we can't handle this at the
 376          * moment. The problem is that when OpenVPN decides to switch
 377          * from CONNECTED state to RECONNECTING and then to RESOLVE,
 378          * it is not possible to do a DNS lookup. The DNS server is
 379          * not accessable through the tunnel anymore and so we end up
 380          * trying to resolve the OpenVPN servers address.
 381          */
 382         connman_task_add_argument(task, "--ping-restart", "0");
 383
 384         fd = fileno(stderr);
 385         err = connman_task_run(task, vpn_died, provider,
 386                         NULL, &fd, &fd);
 387         if (err < 0) {
 388                 connman_error("openvpn failed to start");
 389                 err = -EIO;
 390                 goto done;
 391         }
 392
 393 done:
 394         if (cb)
 395                 cb(provider, user_data, err);
 396
 397         return err;
 398 }
 399
 400 static struct vpn_driver vpn_driver = {
 401         .notify = ov_notify,
 402         .connect        = ov_connect,
 403         .save           = ov_save,
 404 };
 405
 406 static int openvpn_init(void)
 407 {
 408         connection = connman_dbus_get_connection();
 409
 410         return vpn_register("openvpn", &vpn_driver, OPENVPN);
 411 }
 412
 413 static void openvpn_exit(void)
 414 {
 415         vpn_unregister("openvpn");
 416
 417         dbus_connection_unref(connection);
 418 }
 419
 420 CONNMAN_PLUGIN_DEFINE(openvpn, "OpenVPN plugin", VERSION,
 421         CONNMAN_PLUGIN_PRIORITY_DEFAULT, openvpn_init, openvpn_exit)