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 static void ov_append_dns_entries(const char *key, const char *value,
  46                                         char **dns_entries)
  47 {
  48         gchar **options;
  49
  50         if (g_str_has_prefix(key, "foreign_option_") == FALSE)
  51                 return;
  52
  53         options = g_strsplit(value, " ", 3);
  54         if (options[0] != NULL &&
  55                 !strcmp(options[0], "dhcp-option") &&
  56                         options[1] != NULL &&
  57                         !strcmp(options[1], "DNS") &&
  58                                 options[2] != NULL) {
  59
  60                 if (*dns_entries != NULL) {
  61                         char *tmp;
  62
  63                         tmp = g_strjoin(" ", *dns_entries,
  64                                                 options[2], NULL);
  65                         g_free(*dns_entries);
  66                         *dns_entries = tmp;
  67                 } else {
  68                         *dns_entries = g_strdup(options[2]);
  69                 }
  70         }
  71
  72         g_strfreev(options);
  73 }
  74
  75 static int ov_notify(DBusMessage *msg, struct connman_provider *provider)
  76 {
  77         DBusMessageIter iter, dict;
  78         const char *reason, *key, *value;
  79         const char *domain = NULL;
  80         char *dns_entries = NULL;
  81
  82         dbus_message_iter_init(msg, &iter);
  83
  84         dbus_message_iter_get_basic(&iter, &reason);
  85         dbus_message_iter_next(&iter);
  86
  87         if (!provider) {
  88                 connman_error("No provider found");
  89                 return VPN_STATE_FAILURE;
  90         }
  91
  92         if (strcmp(reason, "up"))
  93                 return VPN_STATE_DISCONNECT;
  94
  95         domain = connman_provider_get_string(provider, "VPN.Domain");
  96
  97         dbus_message_iter_recurse(&iter, &dict);
  98
  99         while (dbus_message_iter_get_arg_type(&dict) == DBUS_TYPE_DICT_ENTRY) {
 100                 DBusMessageIter entry;
 101
 102                 dbus_message_iter_recurse(&dict, &entry);
 103                 dbus_message_iter_get_basic(&entry, &key);
 104                 dbus_message_iter_next(&entry);
 105                 dbus_message_iter_get_basic(&entry, &value);
 106
 107                 DBG("%s = %s", key, value);
 108
 109                 if (!strcmp(key, "trusted_ip"))
 110                         connman_provider_set_string(provider, "Gateway", value);
 111
 112                 if (!strcmp(key, "ifconfig_local"))
 113                         connman_provider_set_string(provider, "Address", value);
 114
 115                 if (!strcmp(key, "ifconfig_remote"))
 116                         connman_provider_set_string(provider, "Peer", value);
 117
 118                 if (g_str_has_prefix(key, "network_") == TRUE)
 119                         connman_provider_append_route(provider, key, value);
 120
 121                 ov_append_dns_entries(key, value, &dns_entries);
 122
 123                 dbus_message_iter_next(&dict);
 124         }
 125
 126         if (dns_entries != NULL) {
 127                 connman_provider_set_string(provider, "DNS", dns_entries);
 128                 g_free(dns_entries);
 129         }
 130
 131         return VPN_STATE_CONNECT;
 132 }
 133
 134 static int ov_connect(struct connman_provider *provider,
 135                 struct connman_task *task, const char *if_name)
 136 {
 137         const char *vpnhost, *cafile, *mtu, *certfile, *keyfile;
 138         const char *proto, *port, *auth_user_pass;
 139         const char *tls_remote, *cipher, *auth, *comp_lzo;
 140         int err, fd;
 141
 142         vpnhost = connman_provider_get_string(provider, "Host");
 143         if (!vpnhost) {
 144                 connman_error("Host not set; cannot enable VPN");
 145                 return -EINVAL;
 146         }
 147
 148         cafile = connman_provider_get_string(provider, "OpenVPN.CACert");
 149         certfile = connman_provider_get_string(provider, "OpenVPN.Cert");
 150         keyfile = connman_provider_get_string(provider, "OpenVPN.Key");
 151         mtu = connman_provider_get_string(provider, "VPN.MTU");
 152         proto = connman_provider_get_string(provider, "OpenVPN.Proto");
 153         port = connman_provider_get_string(provider, "OpenVPN.Port");
 154         auth_user_pass = connman_provider_get_string(provider,
 155                                                         "OpenVPN.AuthUserPass");
 156         tls_remote = connman_provider_get_string(provider, "OpenVPN.TLSRemote");
 157         cipher = connman_provider_get_string(provider, "OpenVPN.Cipher");
 158         auth = connman_provider_get_string(provider, "OpenVPN.Auth");
 159         comp_lzo = connman_provider_get_string(provider, "OpenVPN.CompLZO");
 160
 161         if (mtu != NULL)
 162                 connman_task_add_argument(task, "--mtu", (char *)mtu);
 163
 164         if (proto != NULL)
 165                 connman_task_add_argument(task, "--proto", (char *)proto);
 166
 167         if (port != NULL)
 168                 connman_task_add_argument(task, "--port", (char *)port);
 169
 170         if (auth_user_pass != NULL) {
 171                 connman_task_add_argument(task, "--auth-user-pass",
 172                                                 (char *)auth_user_pass);
 173         }
 174
 175         if (tls_remote != NULL) {
 176                 connman_task_add_argument(task, "--tls-remote",
 177                                                 (char *)tls_remote);
 178         }
 179
 180         if (cipher != NULL)
 181                 connman_task_add_argument(task, "--cipher", (char *)cipher);
 182
 183         if (auth != NULL)
 184                 connman_task_add_argument(task, "--auth", (char *)auth);
 185
 186         if (comp_lzo)
 187                 connman_task_add_argument(task, "--comp-lzo", (char *)comp_lzo);
 188
 189         connman_task_add_argument(task, "--syslog", NULL);
 190
 191         connman_task_add_argument(task, "--script-security", "2");
 192
 193         connman_task_add_argument(task, "--up",
 194                                         SCRIPTDIR "/openvpn-script");
 195         connman_task_add_argument(task, "--up-restart", NULL);
 196
 197         connman_task_add_argument(task, "--setenv", NULL);
 198         connman_task_add_argument(task, "CONNMAN_BUSNAME",
 199                                         dbus_bus_get_unique_name(connection));
 200
 201         connman_task_add_argument(task, "--setenv", NULL);
 202         connman_task_add_argument(task, "CONNMAN_INTERFACE",
 203                                         CONNMAN_TASK_INTERFACE);
 204
 205         connman_task_add_argument(task, "--setenv", NULL);
 206         connman_task_add_argument(task, "CONNMAN_PATH",
 207                                         connman_task_get_path(task));
 208
 209         connman_task_add_argument(task, "--dev", if_name);
 210         connman_task_add_argument(task, "--dev-type", "tun");
 211
 212         connman_task_add_argument(task, "--tls-client", NULL);
 213         connman_task_add_argument(task, "--remote", (char *)vpnhost);
 214         connman_task_add_argument(task, "--nobind", NULL);
 215         connman_task_add_argument(task, "--persist-key", NULL);
 216         connman_task_add_argument(task, "--persist-tun", NULL);
 217
 218         connman_task_add_argument(task, "--route-noexec", NULL);
 219         connman_task_add_argument(task, "--ifconfig-noexec", NULL);
 220
 221         /*
 222          * Disable client restarts because we can't handle this at the
 223          * moment. The problem is that when OpenVPN decides to switch
 224          * from CONNECTED state to RECONNECTING and then to RESOLVE,
 225          * it is not possible to do a DNS lookup. The DNS server is
 226          * not accessable through the tunnel anymore and so we end up
 227          * trying to resolve the OpenVPN servers address.
 228          */
 229         connman_task_add_argument(task, "--ping-restart", "0");
 230
 231         connman_task_add_argument(task, "--client", NULL);
 232
 233         if (cafile) {
 234                 connman_task_add_argument(task, "--ca",
 235                                                 (char *)cafile);
 236         }
 237
 238         if (certfile) {
 239                 connman_task_add_argument(task, "--cert",
 240                                                 (char *)certfile);
 241         }
 242
 243         if (keyfile) {
 244                 connman_task_add_argument(task, "--key",
 245                                                 (char *)keyfile);
 246         }
 247
 248         fd = fileno(stderr);
 249         err = connman_task_run(task, vpn_died, provider,
 250                         NULL, &fd, &fd);
 251         if (err < 0) {
 252                 connman_error("openvpn failed to start");
 253                 return -EIO;
 254         }
 255
 256         return 0;
 257 }
 258
 259 static struct vpn_driver vpn_driver = {
 260         .notify = ov_notify,
 261         .connect        = ov_connect,
 262 };
 263
 264 static int openvpn_init(void)
 265 {
 266         connection = connman_dbus_get_connection();
 267
 268         return vpn_register("openvpn", &vpn_driver, OPENVPN);
 269 }
 270
 271 static void openvpn_exit(void)
 272 {
 273         vpn_unregister("openvpn");
 274
 275         dbus_connection_unref(connection);
 276 }
 277
 278 CONNMAN_PLUGIN_DEFINE(openvpn, "OpenVPN plugin", VERSION,
 279         CONNMAN_PLUGIN_PRIORITY_DEFAULT, openvpn_init, openvpn_exit)