plugins/openvpn.c

   1 /*
   2  *
   3  *  Connection Manager
   4  *
   5  *  Copyright (C) 2010  BMW Car IT GmbH. All rights reserved.
   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 <string.h>
  27 #include <errno.h>
  28 #include <unistd.h>
  29 #include <stdio.h>
  30 #include <net/if.h>
  31
  32 #include <glib.h>
  33
  34 #define CONNMAN_API_SUBJECT_TO_CHANGE
  35 #include <connman/plugin.h>
  36 #include <connman/provider.h>
  37 #include <connman/log.h>
  38 #include <connman/task.h>
  39 #include <connman/dbus.h>
  40
  41 #include "vpn.h"
  42
  43 static DBusConnection *connection;
  44
  45 struct ov_route {
  46         char *host;
  47         char *netmask;
  48         char *gateway;
  49 };
  50
  51 static void destroy_route(gpointer user_data)
  52 {
  53         struct ov_route *route = user_data;
  54
  55         g_free(route->host);
  56         g_free(route->netmask);
  57         g_free(route->gateway);
  58         g_free(route);
  59 }
  60
  61 static void ov_provider_append_routes(gpointer key, gpointer value,
  62                                         gpointer user_data)
  63 {
  64         struct ov_route *route = value;
  65         struct connman_provider *provider = user_data;
  66
  67         connman_provider_append_route(provider, route->host, route->netmask,
  68                                         route->gateway);
  69 }
  70
  71 static struct ov_route *ov_route_lookup(const char *key, const char *prefix_key,
  72                                         GHashTable *routes)
  73 {
  74         if (g_str_has_prefix(key, prefix_key)) {
  75                 unsigned long idx;
  76                 const char *start;
  77                 char *end;
  78                 struct ov_route *route;
  79
  80                 start = key + strlen(prefix_key);
  81                 idx = g_ascii_strtoull(start, &end, 10);
  82
  83                 if (idx == 0 && start == end) {
  84                         connman_error("string conversion failed %s", start);
  85                         return NULL;
  86                 }
  87
  88                 route = g_hash_table_lookup(routes, GINT_TO_POINTER(idx));
  89                 if (route == NULL) {
  90                         route = g_try_new0(struct ov_route, 1);
  91                         if (route == NULL) {
  92                                 connman_error("out of memory");
  93                                 return NULL;
  94                         }
  95
  96                         g_hash_table_replace(routes, GINT_TO_POINTER(idx),
  97                                                 route);
  98                 }
  99
 100                 return  route;
 101         }
 102
 103         return NULL;
 104 }
 105
 106 static void ov_append_route(const char *key, const char *value, GHashTable *routes)
 107 {
 108         struct ov_route *route;
 109
 110         /*
 111          * OpenVPN pushes routing tupples (host, nw, gw) as several
 112          * environment values, e.g.
 113          *
 114          * route_gateway_2 = 10.242.2.13
 115          * route_netmask_2 = 255.255.0.0
 116          * route_network_2 = 192.168.0.0
 117          * route_gateway_1 = 10.242.2.13
 118          * route_netmask_1 = 255.255.255.255
 119          * route_network_1 = 10.242.2.1
 120          *
 121          * The hash table is used to group the separate environment
 122          * variables together. It also makes sure all tupples are
 123          * complete even when OpenVPN pushes the information in a
 124          * wrong order (unlikely).
 125          */
 126
 127         route = ov_route_lookup(key, "route_network_", routes);
 128         if (route != NULL) {
 129                 route->host = g_strdup(value);
 130                 return;
 131         }
 132
 133         route = ov_route_lookup(key, "route_netmask_", routes);
 134         if (route != NULL) {
 135                 route->netmask = g_strdup(value);
 136                 return;
 137         }
 138
 139         route = ov_route_lookup(key, "route_gateway_", routes);
 140         if (route != NULL)
 141                 route->gateway = g_strdup(value);
 142 }
 143
 144 static void ov_append_dns_entries(const char *key, const char *value,
 145                                         char **dns_entries)
 146 {
 147         if (g_str_has_prefix(key, "foreign_option_")) {
 148                 gchar **options;
 149
 150                 options = g_strsplit(value, " ", 3);
 151                 if (options[0] != NULL &&
 152                         !strcmp(options[0], "dhcp-option") &&
 153                         options[1] != NULL &&
 154                         !strcmp(options[1], "DNS") &&
 155                         options[2] != NULL) {
 156
 157                         if (*dns_entries != NULL) {
 158                                 char *tmp;
 159
 160                                 tmp = g_strjoin(" ", *dns_entries,
 161                                                 options[2], NULL);
 162                                 g_free(*dns_entries);
 163                                 *dns_entries = tmp;
 164                         } else {
 165                                 *dns_entries = g_strdup(options[2]);
 166                         }
 167                 }
 168
 169                 g_strfreev(options);
 170         }
 171 }
 172
 173 static int ov_notify(DBusMessage *msg, struct connman_provider *provider)
 174 {
 175         DBusMessageIter iter, dict;
 176         const char *reason, *key, *value;
 177         const char *domain = NULL;
 178         char *dns_entries = NULL;
 179         GHashTable *routes;
 180
 181         dbus_message_iter_init(msg, &iter);
 182
 183         dbus_message_iter_get_basic(&iter, &reason);
 184         dbus_message_iter_next(&iter);
 185
 186         dbus_message_iter_init(msg, &iter);
 187
 188         dbus_message_iter_get_basic(&iter, &reason);
 189         dbus_message_iter_next(&iter);
 190
 191         if (!provider) {
 192                 connman_error("No provider found");
 193                 return VPN_STATE_FAILURE;
 194         }
 195
 196         if (strcmp(reason, "up"))
 197                 return VPN_STATE_DISCONNECT;
 198
 199         domain = connman_provider_get_string(provider, "VPN.Domain");
 200
 201         dbus_message_iter_recurse(&iter, &dict);
 202
 203         routes = g_hash_table_new_full(g_direct_hash, g_direct_equal,
 204                                         NULL, destroy_route);
 205
 206         while (dbus_message_iter_get_arg_type(&dict) == DBUS_TYPE_DICT_ENTRY) {
 207                 DBusMessageIter entry;
 208
 209                 dbus_message_iter_recurse(&dict, &entry);
 210                 dbus_message_iter_get_basic(&entry, &key);
 211                 dbus_message_iter_next(&entry);
 212                 dbus_message_iter_get_basic(&entry, &value);
 213
 214                 DBG("%s = %s", key, value);
 215
 216                 if (!strcmp(key, "trusted_ip"))
 217                         connman_provider_set_string(provider, "Gateway", value);
 218
 219                 if (!strcmp(key, "ifconfig_local"))
 220                         connman_provider_set_string(provider, "Address", value);
 221
 222                 if (!strcmp(key, "ifconfig_remote"))
 223                         connman_provider_set_string(provider, "Peer", value);
 224
 225                 ov_append_route(key, value, routes);
 226
 227                 ov_append_dns_entries(key, value, &dns_entries);
 228
 229                 dbus_message_iter_next(&dict);
 230         }
 231
 232         if (dns_entries != NULL) {
 233                 connman_provider_set_string(provider, "DNS", dns_entries);
 234                 g_free(dns_entries);
 235         }
 236
 237         g_hash_table_foreach(routes, ov_provider_append_routes, provider);
 238
 239         g_hash_table_destroy(routes);
 240
 241         return VPN_STATE_CONNECT;
 242 }
 243
 244 static int ov_connect(struct connman_provider *provider,
 245                 struct connman_task *task, const char *if_name)
 246 {
 247         const char *vpnhost, *cafile, *mtu, *certfile, *keyfile;
 248         const char *proto, *port, *auth_user_pass;
 249         const char *tls_remote, *cipher, *auth, *comp_lzo;
 250         int err, fd;
 251
 252         vpnhost = connman_provider_get_string(provider, "Host");
 253         if (!vpnhost) {
 254                 connman_error("Host not set; cannot enable VPN");
 255                 return -EINVAL;
 256         }
 257
 258         cafile = connman_provider_get_string(provider, "OpenVPN.CACert");
 259         certfile = connman_provider_get_string(provider, "OpenVPN.Cert");
 260         keyfile = connman_provider_get_string(provider, "OpenVPN.Key");
 261         mtu = connman_provider_get_string(provider, "VPN.MTU");
 262         proto = connman_provider_get_string(provider, "OpenVPN.Proto");
 263         port = connman_provider_get_string(provider, "OpenVPN.Port");
 264         auth_user_pass = connman_provider_get_string(provider,
 265                                                         "OpenVPN.AuthUserPass");
 266         tls_remote = connman_provider_get_string(provider, "OpenVPN.TLSRemote");
 267         cipher = connman_provider_get_string(provider, "OpenVPN.Cipher");
 268         auth = connman_provider_get_string(provider, "OpenVPN.Auth");
 269         comp_lzo = connman_provider_get_string(provider, "OpenVPN.CompLZO");
 270
 271         if (mtu != NULL)
 272                 connman_task_add_argument(task, "--mtu", (char *)mtu);
 273
 274         if (proto != NULL)
 275                 connman_task_add_argument(task, "--proto", (char *)proto);
 276
 277         if (port != NULL)
 278                 connman_task_add_argument(task, "--port", (char *)port);
 279
 280         if (auth_user_pass != NULL) {
 281                 connman_task_add_argument(task, "--auth-user-pass",
 282                                                 (char *)auth_user_pass);
 283         }
 284
 285         if (tls_remote != NULL) {
 286                 connman_task_add_argument(task, "--tls-remote",
 287                                                 (char *)tls_remote);
 288         }
 289
 290         if (cipher != NULL)
 291                 connman_task_add_argument(task, "--cipher", (char *)cipher);
 292
 293         if (auth != NULL)
 294                 connman_task_add_argument(task, "--auth", (char *)auth);
 295
 296         if (comp_lzo)
 297                 connman_task_add_argument(task, "--comp-lzo", (char *)comp_lzo);
 298
 299         connman_task_add_argument(task, "--syslog", NULL);
 300
 301         connman_task_add_argument(task, "--script-security", "2");
 302
 303         connman_task_add_argument(task, "--up",
 304                                         SCRIPTDIR "/openvpn-script");
 305         connman_task_add_argument(task, "--up-restart", NULL);
 306
 307         connman_task_add_argument(task, "--setenv", NULL);
 308         connman_task_add_argument(task, "CONNMAN_BUSNAME",
 309                                         dbus_bus_get_unique_name(connection));
 310
 311         connman_task_add_argument(task, "--setenv", NULL);
 312         connman_task_add_argument(task, "CONNMAN_INTERFACE",
 313                                         CONNMAN_TASK_INTERFACE);
 314
 315         connman_task_add_argument(task, "--setenv", NULL);
 316         connman_task_add_argument(task, "CONNMAN_PATH",
 317                                         connman_task_get_path(task));
 318
 319         connman_task_add_argument(task, "--dev", if_name);
 320         connman_task_add_argument(task, "--dev-type", "tun");
 321
 322         connman_task_add_argument(task, "--tls-client", NULL);
 323         connman_task_add_argument(task, "--remote", (char *)vpnhost);
 324         connman_task_add_argument(task, "--nobind", NULL);
 325         connman_task_add_argument(task, "--persist-key", NULL);
 326         connman_task_add_argument(task, "--persist-tun", NULL);
 327
 328         connman_task_add_argument(task, "--route-noexec", NULL);
 329         connman_task_add_argument(task, "--ifconfig-noexec", NULL);
 330
 331         /*
 332          * Disable client restarts because we can't handle this at the
 333          * moment. The problem is that when OpenVPN decides to switch
 334          * from CONNECTED state to RECONNECTING and then to RESOLVE,
 335          * it is not possible to do a DNS lookup. The DNS server is
 336          * not accessable through the tunnel anymore and so we end up
 337          * trying to resolve the OpenVPN servers address.
 338          */
 339         connman_task_add_argument(task, "--ping-restart", "0");
 340
 341         connman_task_add_argument(task, "--client", NULL);
 342
 343         if (cafile) {
 344                 connman_task_add_argument(task, "--ca",
 345                                                 (char *)cafile);
 346         }
 347
 348         if (certfile) {
 349                 connman_task_add_argument(task, "--cert",
 350                                                 (char *)certfile);
 351         }
 352
 353         if (keyfile) {
 354                 connman_task_add_argument(task, "--key",
 355                                                 (char *)keyfile);
 356         }
 357
 358         fd = fileno(stderr);
 359         err = connman_task_run(task, vpn_died, provider,
 360                         NULL, &fd, &fd);
 361         if (err < 0) {
 362                 connman_error("openvpn failed to start");
 363                 return -EIO;
 364         }
 365
 366         return 0;
 367 }
 368
 369 static struct vpn_driver vpn_driver = {
 370         .notify = ov_notify,
 371         .connect        = ov_connect,
 372 };
 373
 374 static int openvpn_init(void)
 375 {
 376         connection = connman_dbus_get_connection();
 377
 378         return vpn_register("openvpn", &vpn_driver, OPENVPN);
 379 }
 380
 381 static void openvpn_exit(void)
 382 {
 383         vpn_unregister("openvpn");
 384
 385         dbus_connection_unref(connection);
 386 }
 387
 388 CONNMAN_PLUGIN_DEFINE(openvpn, "OpenVPN plugin", VERSION,
 389         CONNMAN_PLUGIN_PRIORITY_DEFAULT, openvpn_init, openvpn_exit)