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 #include <connman/ipconfig.h>
  41
  42 #include "vpn.h"
  43
  44 #define ARRAY_SIZE(a) (sizeof(a)/sizeof(a[0]))
  45
  46 static DBusConnection *connection;
  47
  48 struct {
  49         const char *cm_opt;
  50         const char *ov_opt;
  51 } ov_options[] = {
  52         { "Host", "--remote" },
  53         { "OpenVPN.CACert", "--ca" },
  54         { "OpenVPN.Cert", "--cert" },
  55         { "OpenVPN.Key", "--key" },
  56         { "OpenVPN.MTU", "--mtu" },
  57         { "OpenVPN.Proto", "--proto" },
  58         { "OpenVPN.Port", "--port" },
  59         { "OpenVPN.AuthUserPass", "--auth-user-pass" },
  60         { "OpenVPN.TLSRemote", "--tls-remote" },
  61         { "OpenVPN.Cipher", "--cipher" },
  62         { "OpenVPN.Auth", "--auth" },
  63         { "OpenVPN.CompLZO", "--comp-lzo" },
  64         { "OpenVPN.RemoteCertTls", "--remote-cert-tls" },
  65 };
  66
  67 static void ov_append_dns_entries(const char *key, const char *value,
  68                                         char **dns_entries)
  69 {
  70         gchar **options;
  71
  72         if (g_str_has_prefix(key, "foreign_option_") == FALSE)
  73                 return;
  74
  75         options = g_strsplit(value, " ", 3);
  76         if (options[0] != NULL &&
  77                 !strcmp(options[0], "dhcp-option") &&
  78                         options[1] != NULL &&
  79                         !strcmp(options[1], "DNS") &&
  80                                 options[2] != NULL) {
  81
  82                 if (*dns_entries != NULL) {
  83                         char *tmp;
  84
  85                         tmp = g_strjoin(" ", *dns_entries,
  86                                                 options[2], NULL);
  87                         g_free(*dns_entries);
  88                         *dns_entries = tmp;
  89                 } else {
  90                         *dns_entries = g_strdup(options[2]);
  91                 }
  92         }
  93
  94         g_strfreev(options);
  95 }
  96
  97 static int ov_notify(DBusMessage *msg, struct connman_provider *provider)
  98 {
  99         DBusMessageIter iter, dict;
 100         const char *reason, *key, *value;
 101         char *nameservers = NULL;
 102         char *address = NULL, *gateway = NULL, *peer = NULL;
 103         struct connman_ipaddress *ipaddress;
 104
 105         dbus_message_iter_init(msg, &iter);
 106
 107         dbus_message_iter_get_basic(&iter, &reason);
 108         dbus_message_iter_next(&iter);
 109
 110         if (!provider) {
 111                 connman_error("No provider found");
 112                 return VPN_STATE_FAILURE;
 113         }
 114
 115         if (strcmp(reason, "up"))
 116                 return VPN_STATE_DISCONNECT;
 117
 118         dbus_message_iter_recurse(&iter, &dict);
 119
 120         while (dbus_message_iter_get_arg_type(&dict) == DBUS_TYPE_DICT_ENTRY) {
 121                 DBusMessageIter entry;
 122
 123                 dbus_message_iter_recurse(&dict, &entry);
 124                 dbus_message_iter_get_basic(&entry, &key);
 125                 dbus_message_iter_next(&entry);
 126                 dbus_message_iter_get_basic(&entry, &value);
 127
 128                 DBG("%s = %s", key, value);
 129
 130                 if (!strcmp(key, "trusted_ip")) {
 131                         connman_provider_set_string(provider, "Gateway", value);
 132                         gateway = g_strdup(value);
 133                 }
 134
 135                 if (!strcmp(key, "ifconfig_local")) {
 136                         connman_provider_set_string(provider, "Address", value);
 137                         address = g_strdup(value);
 138                 }
 139
 140                 if (!strcmp(key, "ifconfig_remote")) {
 141                         connman_provider_set_string(provider, "Peer", value);
 142                         peer = g_strdup(value);
 143                 }
 144
 145                 if (g_str_has_prefix(key, "route_") == TRUE)
 146                         connman_provider_append_route(provider, key, value);
 147
 148                 ov_append_dns_entries(key, value, &nameservers);
 149
 150                 dbus_message_iter_next(&dict);
 151         }
 152
 153         ipaddress = connman_ipaddress_alloc(AF_INET);
 154         if (ipaddress == NULL) {
 155                 g_free(nameservers);
 156                 g_free(address);
 157                 g_free(gateway);
 158                 g_free(peer);
 159
 160                 return VPN_STATE_FAILURE;
 161         }
 162
 163         connman_ipaddress_set_ipv4(ipaddress, address, NULL, gateway);
 164         connman_ipaddress_set_peer(ipaddress, peer);
 165         connman_provider_set_ipaddress(provider, ipaddress);
 166
 167         connman_provider_set_nameservers(provider, nameservers);
 168
 169         g_free(nameservers);
 170         g_free(address);
 171         g_free(gateway);
 172         g_free(peer);
 173         connman_ipaddress_free(ipaddress);
 174
 175         return VPN_STATE_CONNECT;
 176 }
 177
 178 static int task_append_config_data(struct connman_provider *provider,
 179                                         struct connman_task *task)
 180 {
 181         const char *option;
 182         int i;
 183
 184         for (i = 0; i < (int)ARRAY_SIZE(ov_options); i++) {
 185                 option = connman_provider_get_string(provider,
 186                                         ov_options[i].cm_opt);
 187                 if (option == NULL)
 188                         continue;
 189
 190                 if (connman_task_add_argument(task,
 191                                         ov_options[i].ov_opt, option) < 0) {
 192                         return -EIO;
 193                 }
 194         }
 195
 196         return 0;
 197 }
 198
 199 static int ov_connect(struct connman_provider *provider,
 200                 struct connman_task *task, const char *if_name)
 201 {
 202         const char *option;
 203         int err, fd;
 204
 205         option = connman_provider_get_string(provider, "Host");
 206         if (option == NULL) {
 207                 connman_error("Host not set; cannot enable VPN");
 208                 return -EINVAL;
 209         }
 210
 211         task_append_config_data(provider, task);
 212
 213         connman_task_add_argument(task, "--syslog", NULL);
 214
 215         connman_task_add_argument(task, "--script-security", "2");
 216
 217         connman_task_add_argument(task, "--up",
 218                                         SCRIPTDIR "/openvpn-script");
 219         connman_task_add_argument(task, "--up-restart", NULL);
 220
 221         connman_task_add_argument(task, "--setenv", NULL);
 222         connman_task_add_argument(task, "CONNMAN_BUSNAME",
 223                                         dbus_bus_get_unique_name(connection));
 224
 225         connman_task_add_argument(task, "--setenv", NULL);
 226         connman_task_add_argument(task, "CONNMAN_INTERFACE",
 227                                         CONNMAN_TASK_INTERFACE);
 228
 229         connman_task_add_argument(task, "--setenv", NULL);
 230         connman_task_add_argument(task, "CONNMAN_PATH",
 231                                         connman_task_get_path(task));
 232
 233         connman_task_add_argument(task, "--dev", if_name);
 234         connman_task_add_argument(task, "--dev-type", "tun");
 235
 236         connman_task_add_argument(task, "--tls-client", NULL);
 237         connman_task_add_argument(task, "--nobind", NULL);
 238         connman_task_add_argument(task, "--persist-key", NULL);
 239         connman_task_add_argument(task, "--persist-tun", NULL);
 240
 241         connman_task_add_argument(task, "--route-noexec", NULL);
 242         connman_task_add_argument(task, "--ifconfig-noexec", NULL);
 243
 244         /*
 245          * Disable client restarts because we can't handle this at the
 246          * moment. The problem is that when OpenVPN decides to switch
 247          * from CONNECTED state to RECONNECTING and then to RESOLVE,
 248          * it is not possible to do a DNS lookup. The DNS server is
 249          * not accessable through the tunnel anymore and so we end up
 250          * trying to resolve the OpenVPN servers address.
 251          */
 252         connman_task_add_argument(task, "--ping-restart", "0");
 253
 254         connman_task_add_argument(task, "--client", NULL);
 255
 256         fd = fileno(stderr);
 257         err = connman_task_run(task, vpn_died, provider,
 258                         NULL, &fd, &fd);
 259         if (err < 0) {
 260                 connman_error("openvpn failed to start");
 261                 return -EIO;
 262         }
 263
 264         return 0;
 265 }
 266
 267 static struct vpn_driver vpn_driver = {
 268         .notify = ov_notify,
 269         .connect        = ov_connect,
 270 };
 271
 272 static int openvpn_init(void)
 273 {
 274         connection = connman_dbus_get_connection();
 275
 276         return vpn_register("openvpn", &vpn_driver, OPENVPN);
 277 }
 278
 279 static void openvpn_exit(void)
 280 {
 281         vpn_unregister("openvpn");
 282
 283         dbus_connection_unref(connection);
 284 }
 285
 286 CONNMAN_PLUGIN_DEFINE(openvpn, "OpenVPN plugin", VERSION,
 287         CONNMAN_PLUGIN_PRIORITY_DEFAULT, openvpn_init, openvpn_exit)