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         char       has_value;
  52 } ov_options[] = {
  53         { "Host", "--remote", 1 },
  54         { "OpenVPN.CACert", "--ca", 1 },
  55         { "OpenVPN.Cert", "--cert", 1 },
  56         { "OpenVPN.Key", "--key", 1 },
  57         { "OpenVPN.MTU", "--mtu", 1 },
  58         { "OpenVPN.Proto", "--proto", 1 },
  59         { "OpenVPN.Port", "--port", 1 },
  60         { "OpenVPN.AuthUserPass", "--auth-user-pass", 1 },
  61         { "OpenVPN.TLSRemote", "--tls-remote", 1 },
  62         { "OpenVPN.Cipher", "--cipher", 1 },
  63         { "OpenVPN.Auth", "--auth", 1 },
  64         { "OpenVPN.CompLZO", "--comp-lzo", 0 },
  65         { "OpenVPN.RemoteCertTls", "--remote-cert-tls", 1 },
  66 };
  67
  68 static void ov_append_dns_entries(const char *key, const char *value,
  69                                         char **dns_entries)
  70 {
  71         gchar **options;
  72
  73         if (g_str_has_prefix(key, "foreign_option_") == FALSE)
  74                 return;
  75
  76         options = g_strsplit(value, " ", 3);
  77         if (options[0] != NULL &&
  78                 !strcmp(options[0], "dhcp-option") &&
  79                         options[1] != NULL &&
  80                         !strcmp(options[1], "DNS") &&
  81                                 options[2] != NULL) {
  82
  83                 if (*dns_entries != NULL) {
  84                         char *tmp;
  85
  86                         tmp = g_strjoin(" ", *dns_entries,
  87                                                 options[2], NULL);
  88                         g_free(*dns_entries);
  89                         *dns_entries = tmp;
  90                 } else {
  91                         *dns_entries = g_strdup(options[2]);
  92                 }
  93         }
  94
  95         g_strfreev(options);
  96 }
  97
  98 static int ov_notify(DBusMessage *msg, struct connman_provider *provider)
  99 {
 100         DBusMessageIter iter, dict;
 101         const char *reason, *key, *value;
 102         char *nameservers = NULL;
 103         char *address = NULL, *gateway = NULL, *peer = NULL;
 104         struct connman_ipaddress *ipaddress;
 105
 106         dbus_message_iter_init(msg, &iter);
 107
 108         dbus_message_iter_get_basic(&iter, &reason);
 109         dbus_message_iter_next(&iter);
 110
 111         if (!provider) {
 112                 connman_error("No provider found");
 113                 return VPN_STATE_FAILURE;
 114         }
 115
 116         if (strcmp(reason, "up"))
 117                 return VPN_STATE_DISCONNECT;
 118
 119         dbus_message_iter_recurse(&iter, &dict);
 120
 121         while (dbus_message_iter_get_arg_type(&dict) == DBUS_TYPE_DICT_ENTRY) {
 122                 DBusMessageIter entry;
 123
 124                 dbus_message_iter_recurse(&dict, &entry);
 125                 dbus_message_iter_get_basic(&entry, &key);
 126                 dbus_message_iter_next(&entry);
 127                 dbus_message_iter_get_basic(&entry, &value);
 128
 129                 DBG("%s = %s", key, value);
 130
 131                 if (!strcmp(key, "trusted_ip")) {
 132                         connman_provider_set_string(provider, "Gateway", value);
 133                         gateway = g_strdup(value);
 134                 }
 135
 136                 if (!strcmp(key, "ifconfig_local")) {
 137                         connman_provider_set_string(provider, "Address", value);
 138                         address = g_strdup(value);
 139                 }
 140
 141                 if (!strcmp(key, "ifconfig_remote")) {
 142                         connman_provider_set_string(provider, "Peer", value);
 143                         peer = g_strdup(value);
 144                 }
 145
 146                 if (g_str_has_prefix(key, "route_") == TRUE)
 147                         connman_provider_append_route(provider, key, value);
 148
 149                 ov_append_dns_entries(key, value, &nameservers);
 150
 151                 dbus_message_iter_next(&dict);
 152         }
 153
 154         ipaddress = connman_ipaddress_alloc(AF_INET);
 155         if (ipaddress == NULL) {
 156                 g_free(nameservers);
 157                 g_free(address);
 158                 g_free(gateway);
 159                 g_free(peer);
 160
 161                 return VPN_STATE_FAILURE;
 162         }
 163
 164         connman_ipaddress_set_ipv4(ipaddress, address, NULL, gateway);
 165         connman_ipaddress_set_peer(ipaddress, peer);
 166         connman_provider_set_ipaddress(provider, ipaddress);
 167
 168         connman_provider_set_nameservers(provider, nameservers);
 169
 170         g_free(nameservers);
 171         g_free(address);
 172         g_free(gateway);
 173         g_free(peer);
 174         connman_ipaddress_free(ipaddress);
 175
 176         return VPN_STATE_CONNECT;
 177 }
 178
 179 static int ov_save(struct connman_provider *provider, GKeyFile *keyfile)
 180 {
 181         const char *option;
 182         int i;
 183
 184         for (i = 0; i < (int)ARRAY_SIZE(ov_options); i++) {
 185                 if (strncmp(ov_options[i].cm_opt, "OpenVPN.", 8) == 0) {
 186                         option = connman_provider_get_string(provider,
 187                                                         ov_options[i].cm_opt);
 188                         if (option == NULL)
 189                                 continue;
 190
 191                         g_key_file_set_string(keyfile,
 192                                         connman_provider_get_save_group(provider),
 193                                         ov_options[i].cm_opt, option);
 194                 }
 195         }
 196         return 0;
 197 }
 198
 199 static int task_append_config_data(struct connman_provider *provider,
 200                                         struct connman_task *task)
 201 {
 202         const char *option;
 203         int i;
 204
 205         for (i = 0; i < (int)ARRAY_SIZE(ov_options); i++) {
 206                 option = connman_provider_get_string(provider,
 207                                         ov_options[i].cm_opt);
 208                 if (option == NULL)
 209                         continue;
 210
 211                 if (connman_task_add_argument(task,
 212                                         ov_options[i].ov_opt,
 213                                         ov_options[i].has_value ? option : NULL) < 0) {
 214                         return -EIO;
 215                 }
 216         }
 217
 218         return 0;
 219 }
 220
 221 static int ov_connect(struct connman_provider *provider,
 222                 struct connman_task *task, const char *if_name)
 223 {
 224         const char *option;
 225         int err, fd;
 226
 227         option = connman_provider_get_string(provider, "Host");
 228         if (option == NULL) {
 229                 connman_error("Host not set; cannot enable VPN");
 230                 return -EINVAL;
 231         }
 232
 233         task_append_config_data(provider, task);
 234
 235         connman_task_add_argument(task, "--syslog", NULL);
 236
 237         connman_task_add_argument(task, "--script-security", "2");
 238
 239         connman_task_add_argument(task, "--up",
 240                                         SCRIPTDIR "/openvpn-script");
 241         connman_task_add_argument(task, "--up-restart", NULL);
 242
 243         connman_task_add_argument(task, "--setenv", NULL);
 244         connman_task_add_argument(task, "CONNMAN_BUSNAME",
 245                                         dbus_bus_get_unique_name(connection));
 246
 247         connman_task_add_argument(task, "--setenv", NULL);
 248         connman_task_add_argument(task, "CONNMAN_INTERFACE",
 249                                         CONNMAN_TASK_INTERFACE);
 250
 251         connman_task_add_argument(task, "--setenv", NULL);
 252         connman_task_add_argument(task, "CONNMAN_PATH",
 253                                         connman_task_get_path(task));
 254
 255         connman_task_add_argument(task, "--dev", if_name);
 256         connman_task_add_argument(task, "--dev-type", "tun");
 257
 258         connman_task_add_argument(task, "--tls-client", NULL);
 259         connman_task_add_argument(task, "--nobind", NULL);
 260         connman_task_add_argument(task, "--persist-key", NULL);
 261         connman_task_add_argument(task, "--persist-tun", NULL);
 262
 263         connman_task_add_argument(task, "--route-noexec", NULL);
 264         connman_task_add_argument(task, "--ifconfig-noexec", NULL);
 265
 266         /*
 267          * Disable client restarts because we can't handle this at the
 268          * moment. The problem is that when OpenVPN decides to switch
 269          * from CONNECTED state to RECONNECTING and then to RESOLVE,
 270          * it is not possible to do a DNS lookup. The DNS server is
 271          * not accessable through the tunnel anymore and so we end up
 272          * trying to resolve the OpenVPN servers address.
 273          */
 274         connman_task_add_argument(task, "--ping-restart", "0");
 275
 276         connman_task_add_argument(task, "--client", NULL);
 277
 278         fd = fileno(stderr);
 279         err = connman_task_run(task, vpn_died, provider,
 280                         NULL, &fd, &fd);
 281         if (err < 0) {
 282                 connman_error("openvpn failed to start");
 283                 return -EIO;
 284         }
 285
 286         return 0;
 287 }
 288
 289 static struct vpn_driver vpn_driver = {
 290         .notify = ov_notify,
 291         .connect        = ov_connect,
 292         .save           = ov_save,
 293 };
 294
 295 static int openvpn_init(void)
 296 {
 297         connection = connman_dbus_get_connection();
 298
 299         return vpn_register("openvpn", &vpn_driver, OPENVPN);
 300 }
 301
 302 static void openvpn_exit(void)
 303 {
 304         vpn_unregister("openvpn");
 305
 306         dbus_connection_unref(connection);
 307 }
 308
 309 CONNMAN_PLUGIN_DEFINE(openvpn, "OpenVPN plugin", VERSION,
 310         CONNMAN_PLUGIN_PRIORITY_DEFAULT, openvpn_init, openvpn_exit)