vpn/plugins/openvpn.c

   1 /*
   2  *
   3  *  ConnMan VPN daemon
   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/log.h>
  37 #include <connman/task.h>
  38 #include <connman/dbus.h>
  39 #include <connman/ipconfig.h>
  40
  41 #include "../vpn-provider.h"
  42
  43 #include "vpn.h"
  44
  45 #define ARRAY_SIZE(a) (sizeof(a)/sizeof(a[0]))
  46
  47 static DBusConnection *connection;
  48
  49 struct {
  50         const char *cm_opt;
  51         const char *ov_opt;
  52         char       has_value;
  53 } ov_options[] = {
  54         { "Host", "--remote", 1 },
  55         { "OpenVPN.CACert", "--ca", 1 },
  56         { "OpenVPN.Cert", "--cert", 1 },
  57         { "OpenVPN.Key", "--key", 1 },
  58         { "OpenVPN.MTU", "--mtu", 1 },
  59         { "OpenVPN.NSCertType", "--ns-cert-type", 1 },
  60         { "OpenVPN.Proto", "--proto", 1 },
  61         { "OpenVPN.Port", "--port", 1 },
  62         { "OpenVPN.AuthUserPass", "--auth-user-pass", 1 },
  63         { "OpenVPN.AskPass", "--askpass", 1 },
  64         { "OpenVPN.AuthNoCache", "--auth-nocache", 0 },
  65         { "OpenVPN.TLSRemote", "--tls-remote", 1 },
  66         { "OpenVPN.TLSAuth", NULL, 1 },
  67         { "OpenVPN.TLSAuthDir", NULL, 1 },
  68         { "OpenVPN.Cipher", "--cipher", 1 },
  69         { "OpenVPN.Auth", "--auth", 1 },
  70         { "OpenVPN.CompLZO", "--comp-lzo", 0 },
  71         { "OpenVPN.RemoteCertTls", "--remote-cert-tls", 1 },
  72 };
  73
  74 static void ov_append_dns_entries(const char *key, const char *value,
  75                                         char **dns_entries)
  76 {
  77         gchar **options;
  78
  79         if (g_str_has_prefix(key, "foreign_option_") == FALSE)
  80                 return;
  81
  82         options = g_strsplit(value, " ", 3);
  83         if (options[0] != NULL &&
  84                 !strcmp(options[0], "dhcp-option") &&
  85                         options[1] != NULL &&
  86                         !strcmp(options[1], "DNS") &&
  87                                 options[2] != NULL) {
  88
  89                 if (*dns_entries != NULL) {
  90                         char *tmp;
  91
  92                         tmp = g_strjoin(" ", *dns_entries,
  93                                                 options[2], NULL);
  94                         g_free(*dns_entries);
  95                         *dns_entries = tmp;
  96                 } else {
  97                         *dns_entries = g_strdup(options[2]);
  98                 }
  99         }
 100
 101         g_strfreev(options);
 102 }
 103
 104 static int ov_notify(DBusMessage *msg, struct vpn_provider *provider)
 105 {
 106         DBusMessageIter iter, dict;
 107         const char *reason, *key, *value;
 108         char *nameservers = NULL;
 109         char *address = NULL, *gateway = NULL, *peer = NULL;
 110         struct connman_ipaddress *ipaddress;
 111
 112         dbus_message_iter_init(msg, &iter);
 113
 114         dbus_message_iter_get_basic(&iter, &reason);
 115         dbus_message_iter_next(&iter);
 116
 117         if (!provider) {
 118                 connman_error("No provider found");
 119                 return VPN_STATE_FAILURE;
 120         }
 121
 122         if (strcmp(reason, "up"))
 123                 return VPN_STATE_DISCONNECT;
 124
 125         dbus_message_iter_recurse(&iter, &dict);
 126
 127         while (dbus_message_iter_get_arg_type(&dict) == DBUS_TYPE_DICT_ENTRY) {
 128                 DBusMessageIter entry;
 129
 130                 dbus_message_iter_recurse(&dict, &entry);
 131                 dbus_message_iter_get_basic(&entry, &key);
 132                 dbus_message_iter_next(&entry);
 133                 dbus_message_iter_get_basic(&entry, &value);
 134
 135                 DBG("%s = %s", key, value);
 136
 137                 if (!strcmp(key, "trusted_ip")) {
 138                         vpn_provider_set_string(provider, "Gateway", value);
 139                         gateway = g_strdup(value);
 140                 }
 141
 142                 if (!strcmp(key, "ifconfig_local")) {
 143                         vpn_provider_set_string(provider, "Address", value);
 144                         address = g_strdup(value);
 145                 }
 146
 147                 if (!strcmp(key, "ifconfig_remote")) {
 148                         vpn_provider_set_string(provider, "Peer", value);
 149                         peer = g_strdup(value);
 150                 }
 151
 152                 if (g_str_has_prefix(key, "route_") == TRUE)
 153                         vpn_provider_append_route(provider, key, value);
 154
 155                 ov_append_dns_entries(key, value, &nameservers);
 156
 157                 dbus_message_iter_next(&dict);
 158         }
 159
 160         ipaddress = connman_ipaddress_alloc(AF_INET);
 161         if (ipaddress == NULL) {
 162                 g_free(nameservers);
 163                 g_free(address);
 164                 g_free(gateway);
 165                 g_free(peer);
 166
 167                 return VPN_STATE_FAILURE;
 168         }
 169
 170         connman_ipaddress_set_ipv4(ipaddress, address, NULL, gateway);
 171         connman_ipaddress_set_peer(ipaddress, peer);
 172         vpn_provider_set_ipaddress(provider, ipaddress);
 173
 174         vpn_provider_set_nameservers(provider, nameservers);
 175
 176         g_free(nameservers);
 177         g_free(address);
 178         g_free(gateway);
 179         g_free(peer);
 180         connman_ipaddress_free(ipaddress);
 181
 182         return VPN_STATE_CONNECT;
 183 }
 184
 185 static int ov_save(struct vpn_provider *provider, GKeyFile *keyfile)
 186 {
 187         const char *option;
 188         int i;
 189
 190         for (i = 0; i < (int)ARRAY_SIZE(ov_options); i++) {
 191                 if (strncmp(ov_options[i].cm_opt, "OpenVPN.", 8) == 0) {
 192                         option = vpn_provider_get_string(provider,
 193                                                         ov_options[i].cm_opt);
 194                         if (option == NULL)
 195                                 continue;
 196
 197                         g_key_file_set_string(keyfile,
 198                                         vpn_provider_get_save_group(provider),
 199                                         ov_options[i].cm_opt, option);
 200                 }
 201         }
 202         return 0;
 203 }
 204
 205 static int task_append_config_data(struct vpn_provider *provider,
 206                                         struct connman_task *task)
 207 {
 208         const char *option;
 209         int i;
 210
 211         for (i = 0; i < (int)ARRAY_SIZE(ov_options); i++) {
 212                 if (ov_options[i].ov_opt == NULL)
 213                         continue;
 214
 215                 option = vpn_provider_get_string(provider,
 216                                         ov_options[i].cm_opt);
 217                 if (option == NULL)
 218                         continue;
 219
 220                 if (connman_task_add_argument(task,
 221                                 ov_options[i].ov_opt,
 222                                 ov_options[i].has_value ? option : NULL) < 0) {
 223                         return -EIO;
 224                 }
 225         }
 226
 227         return 0;
 228 }
 229
 230 static int ov_connect(struct vpn_provider *provider,
 231                 struct connman_task *task, const char *if_name)
 232 {
 233         const char *option;
 234         int err, fd;
 235
 236         option = vpn_provider_get_string(provider, "Host");
 237         if (option == NULL) {
 238                 connman_error("Host not set; cannot enable VPN");
 239                 return -EINVAL;
 240         }
 241
 242         task_append_config_data(provider, task);
 243
 244         option = vpn_provider_get_string(provider, "OpenVPN.TLSAuth");
 245         if (option != NULL) {
 246                 connman_task_add_argument(task, "--tls-auth", option);
 247                 option = vpn_provider_get_string(provider,
 248                                 "OpenVPN.TLSAuthDir");
 249                 if (option != NULL)
 250                         connman_task_add_argument(task, option, NULL);
 251         }
 252
 253         connman_task_add_argument(task, "--syslog", NULL);
 254
 255         connman_task_add_argument(task, "--script-security", "2");
 256
 257         connman_task_add_argument(task, "--up",
 258                                         SCRIPTDIR "/openvpn-script");
 259         connman_task_add_argument(task, "--up-restart", NULL);
 260
 261         connman_task_add_argument(task, "--setenv", NULL);
 262         connman_task_add_argument(task, "CONNMAN_BUSNAME",
 263                                         dbus_bus_get_unique_name(connection));
 264
 265         connman_task_add_argument(task, "--setenv", NULL);
 266         connman_task_add_argument(task, "CONNMAN_INTERFACE",
 267                                         CONNMAN_TASK_INTERFACE);
 268
 269         connman_task_add_argument(task, "--setenv", NULL);
 270         connman_task_add_argument(task, "CONNMAN_PATH",
 271                                         connman_task_get_path(task));
 272
 273         connman_task_add_argument(task, "--dev", if_name);
 274         connman_task_add_argument(task, "--dev-type", "tun");
 275
 276         connman_task_add_argument(task, "--nobind", NULL);
 277         connman_task_add_argument(task, "--persist-key", NULL);
 278         connman_task_add_argument(task, "--persist-tun", NULL);
 279
 280         connman_task_add_argument(task, "--route-noexec", NULL);
 281         connman_task_add_argument(task, "--ifconfig-noexec", NULL);
 282
 283         /*
 284          * Disable client restarts because we can't handle this at the
 285          * moment. The problem is that when OpenVPN decides to switch
 286          * from CONNECTED state to RECONNECTING and then to RESOLVE,
 287          * it is not possible to do a DNS lookup. The DNS server is
 288          * not accessable through the tunnel anymore and so we end up
 289          * trying to resolve the OpenVPN servers address.
 290          */
 291         connman_task_add_argument(task, "--ping-restart", "0");
 292
 293         connman_task_add_argument(task, "--client", NULL);
 294
 295         fd = fileno(stderr);
 296         err = connman_task_run(task, vpn_died, provider,
 297                         NULL, &fd, &fd);
 298         if (err < 0) {
 299                 connman_error("openvpn failed to start");
 300                 return -EIO;
 301         }
 302
 303         return 0;
 304 }
 305
 306 static struct vpn_driver vpn_driver = {
 307         .notify = ov_notify,
 308         .connect        = ov_connect,
 309         .save           = ov_save,
 310 };
 311
 312 static int openvpn_init(void)
 313 {
 314         connection = connman_dbus_get_connection();
 315
 316         return vpn_register("openvpn", &vpn_driver, OPENVPN);
 317 }
 318
 319 static void openvpn_exit(void)
 320 {
 321         vpn_unregister("openvpn");
 322
 323         dbus_connection_unref(connection);
 324 }
 325
 326 CONNMAN_PLUGIN_DEFINE(openvpn, "OpenVPN plugin", VERSION,
 327         CONNMAN_PLUGIN_PRIORITY_DEFAULT, openvpn_init, openvpn_exit)