vpn/plugins/pptp.c

   1 /*
   2  *
   3  *  ConnMan VPN daemon
   4  *
   5  *  Copyright (C) 2010,2013-2014  BMW Car IT GmbH.
   6  *  Copyright (C) 2012-2013  Intel Corporation. All rights reserved.
   7  *
   8  *  This program is free software; you can redistribute it and/or modify
   9  *  it under the terms of the GNU General Public License version 2 as
  10  *  published by the Free Software Foundation.
  11  *
  12  *  This program is distributed in the hope that it will be useful,
  13  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  *  GNU General Public License for more details.
  16  *
  17  *  You should have received a copy of the GNU General Public License
  18  *  along with this program; if not, write to the Free Software
  19  *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  20  *
  21  */
  22
  23 #ifdef HAVE_CONFIG_H
  24 #include <config.h>
  25 #endif
  26
  27 #include <string.h>
  28 #include <errno.h>
  29 #include <unistd.h>
  30 #include <stdio.h>
  31 #include <net/if.h>
  32
  33 #include <dbus/dbus.h>
  34 #include <glib.h>
  35
  36 #define CONNMAN_API_SUBJECT_TO_CHANGE
  37 #include <connman/plugin.h>
  38 #include <connman/provider.h>
  39 #include <connman/log.h>
  40 #include <connman/task.h>
  41 #include <connman/dbus.h>
  42 #include <connman/inet.h>
  43 #include <connman/agent.h>
  44 #include <connman/setting.h>
  45 #include <connman/vpn-dbus.h>
  46
  47 #include "../vpn-provider.h"
  48 #include "../vpn-agent.h"
  49
  50 #include "vpn.h"
  51
  52 #define ARRAY_SIZE(a) (sizeof(a)/sizeof(a[0]))
  53
  54 enum {
  55         OPT_STRING = 1,
  56         OPT_BOOL = 2,
  57 };
  58
  59 struct {
  60         const char *cm_opt;
  61         const char *pptp_opt;
  62         const char *vpnc_default;
  63         int type;
  64 } pptp_options[] = {
  65         { "PPTP.User", "user", NULL, OPT_STRING },
  66         { "PPPD.EchoFailure", "lcp-echo-failure", "0", OPT_STRING },
  67         { "PPPD.EchoInterval", "lcp-echo-interval", "0", OPT_STRING },
  68         { "PPPD.Debug", "debug", NULL, OPT_STRING },
  69         { "PPPD.RefuseEAP", "refuse-eap", NULL, OPT_BOOL },
  70         { "PPPD.RefusePAP", "refuse-pap", NULL, OPT_BOOL },
  71         { "PPPD.RefuseCHAP", "refuse-chap", NULL, OPT_BOOL },
  72         { "PPPD.RefuseMSCHAP", "refuse-mschap", NULL, OPT_BOOL },
  73         { "PPPD.RefuseMSCHAP2", "refuse-mschapv2", NULL, OPT_BOOL },
  74         { "PPPD.NoBSDComp", "nobsdcomp", NULL, OPT_BOOL },
  75         { "PPPD.NoDeflate", "nodeflate", NULL, OPT_BOOL },
  76         { "PPPD.RequirMPPE", "require-mppe", NULL, OPT_BOOL },
  77         { "PPPD.RequirMPPE40", "require-mppe-40", NULL, OPT_BOOL },
  78         { "PPPD.RequirMPPE128", "require-mppe-128", NULL, OPT_BOOL },
  79         { "PPPD.RequirMPPEStateful", "mppe-stateful", NULL, OPT_BOOL },
  80         { "PPPD.NoVJ", "novj", NULL, OPT_BOOL },
  81 };
  82
  83 static DBusConnection *connection;
  84
  85 struct pptp_private_data {
  86         struct connman_task *task;
  87         char *if_name;
  88         vpn_provider_connect_cb_t cb;
  89         void *user_data;
  90 };
  91
  92 static DBusMessage *pptp_get_sec(struct connman_task *task,
  93                                 DBusMessage *msg, void *user_data)
  94 {
  95         const char *user, *passwd;
  96         struct vpn_provider *provider = user_data;
  97         DBusMessage *reply;
  98
  99         if (dbus_message_get_no_reply(msg))
 100                 return NULL;
 101
 102         user = vpn_provider_get_string(provider, "PPTP.User");
 103         passwd = vpn_provider_get_string(provider, "PPTP.Password");
 104         if (!user || strlen(user) == 0 ||
 105                                 !passwd || strlen(passwd) == 0)
 106                 return NULL;
 107
 108         reply = dbus_message_new_method_return(msg);
 109         if (!reply)
 110                 return NULL;
 111
 112         dbus_message_append_args(reply, DBUS_TYPE_STRING, &user,
 113                                 DBUS_TYPE_STRING, &passwd,
 114                                 DBUS_TYPE_INVALID);
 115         return reply;
 116 }
 117
 118 static int pptp_notify(DBusMessage *msg, struct vpn_provider *provider)
 119 {
 120         DBusMessageIter iter, dict;
 121         const char *reason, *key, *value;
 122         char *addressv4 = NULL, *netmask = NULL, *gateway = NULL;
 123         char *ifname = NULL, *nameservers = NULL;
 124         struct connman_ipaddress *ipaddress = NULL;
 125
 126         dbus_message_iter_init(msg, &iter);
 127
 128         dbus_message_iter_get_basic(&iter, &reason);
 129         dbus_message_iter_next(&iter);
 130
 131         if (!provider) {
 132                 connman_error("No provider found");
 133                 return VPN_STATE_FAILURE;
 134         }
 135
 136         if (strcmp(reason, "auth failed") == 0) {
 137                 DBG("authentication failure");
 138
 139                 vpn_provider_set_string(provider, "PPTP.User", NULL);
 140                 vpn_provider_set_string(provider, "PPTP.Password", NULL);
 141
 142                 return VPN_STATE_AUTH_FAILURE;
 143         }
 144
 145         if (strcmp(reason, "connect"))
 146                 return VPN_STATE_DISCONNECT;
 147
 148         dbus_message_iter_recurse(&iter, &dict);
 149
 150         while (dbus_message_iter_get_arg_type(&dict) == DBUS_TYPE_DICT_ENTRY) {
 151                 DBusMessageIter entry;
 152
 153                 dbus_message_iter_recurse(&dict, &entry);
 154                 dbus_message_iter_get_basic(&entry, &key);
 155                 dbus_message_iter_next(&entry);
 156                 dbus_message_iter_get_basic(&entry, &value);
 157
 158                 DBG("%s = %s", key, value);
 159
 160                 if (!strcmp(key, "INTERNAL_IP4_ADDRESS"))
 161                         addressv4 = g_strdup(value);
 162
 163                 if (!strcmp(key, "INTERNAL_IP4_NETMASK"))
 164                         netmask = g_strdup(value);
 165
 166                 if (!strcmp(key, "INTERNAL_IP4_DNS"))
 167                         nameservers = g_strdup(value);
 168
 169                 if (!strcmp(key, "INTERNAL_IFNAME"))
 170                         ifname = g_strdup(value);
 171
 172                 dbus_message_iter_next(&dict);
 173         }
 174
 175         if (vpn_set_ifname(provider, ifname) < 0) {
 176                 g_free(ifname);
 177                 g_free(addressv4);
 178                 g_free(netmask);
 179                 g_free(nameservers);
 180                 return VPN_STATE_FAILURE;
 181         }
 182
 183         if (addressv4)
 184                 ipaddress = connman_ipaddress_alloc(AF_INET);
 185
 186         g_free(ifname);
 187
 188         if (!ipaddress) {
 189                 connman_error("No IP address for provider");
 190                 g_free(addressv4);
 191                 g_free(netmask);
 192                 g_free(nameservers);
 193                 return VPN_STATE_FAILURE;
 194         }
 195
 196         value = vpn_provider_get_string(provider, "HostIP");
 197         if (value) {
 198                 vpn_provider_set_string(provider, "Gateway", value);
 199                 gateway = g_strdup(value);
 200         }
 201
 202         if (addressv4)
 203                 connman_ipaddress_set_ipv4(ipaddress, addressv4, netmask,
 204                                         gateway);
 205
 206         vpn_provider_set_ipaddress(provider, ipaddress);
 207         vpn_provider_set_nameservers(provider, nameservers);
 208
 209         g_free(addressv4);
 210         g_free(netmask);
 211         g_free(gateway);
 212         g_free(nameservers);
 213         connman_ipaddress_free(ipaddress);
 214
 215         return VPN_STATE_CONNECT;
 216 }
 217
 218 static int pptp_save(struct vpn_provider *provider, GKeyFile *keyfile)
 219 {
 220         const char *option;
 221         bool pptp_option, pppd_option;
 222         int i;
 223
 224         for (i = 0; i < (int)ARRAY_SIZE(pptp_options); i++) {
 225                 pptp_option = pppd_option = false;
 226
 227                 if (strncmp(pptp_options[i].cm_opt, "PPTP.", 5) == 0)
 228                         pptp_option = true;
 229
 230                 if (strncmp(pptp_options[i].cm_opt, "PPPD.", 5) == 0)
 231                         pppd_option = true;
 232
 233                 if (pptp_option || pppd_option) {
 234                         option = vpn_provider_get_string(provider,
 235                                                         pptp_options[i].cm_opt);
 236                         if (!option) {
 237                                 /*
 238                                  * Check if the option prefix is PPTP as the
 239                                  * PPPD options were using PPTP prefix earlier.
 240                                  */
 241                                 char *pptp_str;
 242
 243                                 if (!pppd_option)
 244                                         continue;
 245
 246                                 pptp_str = g_strdup_printf("PPTP.%s",
 247                                                 &pptp_options[i].cm_opt[5]);
 248                                 option = vpn_provider_get_string(provider,
 249                                                                 pptp_str);
 250                                 g_free(pptp_str);
 251
 252                                 if (!option)
 253                                         continue;
 254                         }
 255
 256                         g_key_file_set_string(keyfile,
 257                                         vpn_provider_get_save_group(provider),
 258                                         pptp_options[i].cm_opt, option);
 259                 }
 260         }
 261
 262         return 0;
 263 }
 264
 265 static void pptp_write_bool_option(struct connman_task *task,
 266                                 const char *key, const char *value)
 267 {
 268         if (key && value) {
 269                 if (strcasecmp(value, "yes") == 0 ||
 270                                 strcasecmp(value, "true") == 0 ||
 271                                 strcmp(value, "1") == 0)
 272                         connman_task_add_argument(task, key, NULL);
 273         }
 274 }
 275
 276 struct request_input_reply {
 277         struct vpn_provider *provider;
 278         vpn_provider_password_cb_t callback;
 279         void *user_data;
 280 };
 281
 282 static void request_input_reply(DBusMessage *reply, void *user_data)
 283 {
 284         struct request_input_reply *pptp_reply = user_data;
 285         const char *error = NULL;
 286         char *username = NULL, *password = NULL;
 287         char *key;
 288         DBusMessageIter iter, dict;
 289
 290         DBG("provider %p", pptp_reply->provider);
 291
 292         if (!reply || dbus_message_get_type(reply) == DBUS_MESSAGE_TYPE_ERROR) {
 293                 if (reply)
 294                         error = dbus_message_get_error_name(reply);
 295                 goto done;
 296         }
 297
 298         if (!vpn_agent_check_reply_has_dict(reply))
 299                 goto done;
 300
 301         dbus_message_iter_init(reply, &iter);
 302         dbus_message_iter_recurse(&iter, &dict);
 303         while (dbus_message_iter_get_arg_type(&dict) == DBUS_TYPE_DICT_ENTRY) {
 304                 DBusMessageIter entry, value;
 305                 const char *str;
 306
 307                 dbus_message_iter_recurse(&dict, &entry);
 308                 if (dbus_message_iter_get_arg_type(&entry) != DBUS_TYPE_STRING)
 309                         break;
 310
 311                 dbus_message_iter_get_basic(&entry, &key);
 312
 313                 if (g_str_equal(key, "Username")) {
 314                         dbus_message_iter_next(&entry);
 315                         if (dbus_message_iter_get_arg_type(&entry)
 316                                                         != DBUS_TYPE_VARIANT)
 317                                 break;
 318                         dbus_message_iter_recurse(&entry, &value);
 319                         if (dbus_message_iter_get_arg_type(&value)
 320                                                         != DBUS_TYPE_STRING)
 321                                 break;
 322                         dbus_message_iter_get_basic(&value, &str);
 323                         username = g_strdup(str);
 324                 }
 325
 326                 if (g_str_equal(key, "Password")) {
 327                         dbus_message_iter_next(&entry);
 328                         if (dbus_message_iter_get_arg_type(&entry)
 329                                                         != DBUS_TYPE_VARIANT)
 330                                 break;
 331                         dbus_message_iter_recurse(&entry, &value);
 332                         if (dbus_message_iter_get_arg_type(&value)
 333                                                         != DBUS_TYPE_STRING)
 334                                 break;
 335                         dbus_message_iter_get_basic(&value, &str);
 336                         password = g_strdup(str);
 337                 }
 338
 339                 dbus_message_iter_next(&dict);
 340         }
 341
 342 done:
 343         pptp_reply->callback(pptp_reply->provider, username, password, error,
 344                                 pptp_reply->user_data);
 345
 346         g_free(username);
 347         g_free(password);
 348
 349         g_free(pptp_reply);
 350 }
 351
 352 typedef void (* request_cb_t)(struct vpn_provider *provider,
 353                                 const char *username, const char *password,
 354                                 const char *error, void *user_data);
 355
 356 static int request_input(struct vpn_provider *provider,
 357                         request_cb_t callback, const char *dbus_sender,
 358                         void *user_data)
 359 {
 360         DBusMessage *message;
 361         const char *path, *agent_sender, *agent_path;
 362         DBusMessageIter iter;
 363         DBusMessageIter dict;
 364         struct request_input_reply *pptp_reply;
 365         int err;
 366         void *agent;
 367
 368         agent = connman_agent_get_info(dbus_sender, &agent_sender,
 369                                                         &agent_path);
 370         if (!provider || !agent || !agent_path || !callback)
 371                 return -ESRCH;
 372
 373         message = dbus_message_new_method_call(agent_sender, agent_path,
 374                                         VPN_AGENT_INTERFACE,
 375                                         "RequestInput");
 376         if (!message)
 377                 return -ENOMEM;
 378
 379         dbus_message_iter_init_append(message, &iter);
 380
 381         path = vpn_provider_get_path(provider);
 382         dbus_message_iter_append_basic(&iter,
 383                                 DBUS_TYPE_OBJECT_PATH, &path);
 384
 385         connman_dbus_dict_open(&iter, &dict);
 386
 387         vpn_agent_append_user_info(&dict, provider, "PPTP.User");
 388
 389         vpn_agent_append_host_and_name(&dict, provider);
 390
 391         connman_dbus_dict_close(&iter, &dict);
 392
 393         pptp_reply = g_try_new0(struct request_input_reply, 1);
 394         if (!pptp_reply) {
 395                 dbus_message_unref(message);
 396                 return -ENOMEM;
 397         }
 398
 399         pptp_reply->provider = provider;
 400         pptp_reply->callback = callback;
 401         pptp_reply->user_data = user_data;
 402
 403         err = connman_agent_queue_message(provider, message,
 404                         connman_timeout_input_request(),
 405                         request_input_reply, pptp_reply, agent);
 406         if (err < 0 && err != -EBUSY) {
 407                 DBG("error %d sending agent request", err);
 408                 dbus_message_unref(message);
 409                 g_free(pptp_reply);
 410                 return err;
 411         }
 412
 413         dbus_message_unref(message);
 414
 415         return -EINPROGRESS;
 416 }
 417
 418 static int run_connect(struct vpn_provider *provider,
 419                         struct connman_task *task, const char *if_name,
 420                         vpn_provider_connect_cb_t cb, void *user_data,
 421                         const char *username, const char *password)
 422 {
 423         const char *opt_s, *host;
 424         char *str;
 425         int err, i;
 426
 427         host = vpn_provider_get_string(provider, "Host");
 428         if (!host) {
 429                 connman_error("Host not set; cannot enable VPN");
 430                 err = -EINVAL;
 431                 goto done;
 432         }
 433
 434         if (!username || !password) {
 435                 DBG("Cannot connect username %s password %p",
 436                                                 username, password);
 437                 err = -EINVAL;
 438                 goto done;
 439         }
 440
 441         DBG("username %s password %p", username, password);
 442
 443         str = g_strdup_printf("%s %s --nolaunchpppd --loglevel 2",
 444                                 PPTP, host);
 445         if (!str) {
 446                 connman_error("can not allocate memory");
 447                 err = -ENOMEM;
 448                 goto done;
 449         }
 450
 451         connman_task_add_argument(task, "pty", str);
 452         g_free(str);
 453
 454         connman_task_add_argument(task, "nodetach", NULL);
 455         connman_task_add_argument(task, "lock", NULL);
 456         connman_task_add_argument(task, "logfd", "2");
 457         connman_task_add_argument(task, "usepeerdns", NULL);
 458         connman_task_add_argument(task, "noipdefault", NULL);
 459         connman_task_add_argument(task, "noauth", NULL);
 460         connman_task_add_argument(task, "nodefaultroute", NULL);
 461         connman_task_add_argument(task, "ipparam", "pptp_plugin");
 462
 463         for (i = 0; i < (int)ARRAY_SIZE(pptp_options); i++) {
 464                 opt_s = vpn_provider_get_string(provider,
 465                                         pptp_options[i].cm_opt);
 466                 if (!opt_s)
 467                         opt_s = pptp_options[i].vpnc_default;
 468
 469                 if (!opt_s)
 470                         continue;
 471
 472                 if (pptp_options[i].type == OPT_STRING)
 473                         connman_task_add_argument(task,
 474                                         pptp_options[i].pptp_opt, opt_s);
 475                 else if (pptp_options[i].type == OPT_BOOL)
 476                         pptp_write_bool_option(task,
 477                                         pptp_options[i].pptp_opt, opt_s);
 478         }
 479
 480         connman_task_add_argument(task, "plugin",
 481                                 SCRIPTDIR "/libppp-plugin.so");
 482
 483         err = connman_task_run(task, vpn_died, provider,
 484                                 NULL, NULL, NULL);
 485         if (err < 0) {
 486                 connman_error("pptp failed to start");
 487                 err = -EIO;
 488                 goto done;
 489         }
 490
 491 done:
 492         if (cb)
 493                 cb(provider, user_data, err);
 494
 495         return err;
 496 }
 497
 498 static void free_private_data(struct pptp_private_data *data)
 499 {
 500         g_free(data->if_name);
 501         g_free(data);
 502 }
 503
 504 static void request_input_cb(struct vpn_provider *provider,
 505                         const char *username,
 506                         const char *password,
 507                         const char *error, void *user_data)
 508 {
 509         struct pptp_private_data *data = user_data;
 510
 511         if (!username || !password)
 512                 DBG("Requesting username %s or password failed, error %s",
 513                         username, error);
 514         else if (error)
 515                 DBG("error %s", error);
 516
 517         vpn_provider_set_string(provider, "PPTP.User", username);
 518         vpn_provider_set_string_hide_value(provider, "PPTP.Password",
 519                                                                 password);
 520
 521         run_connect(provider, data->task, data->if_name, data->cb,
 522                 data->user_data, username, password);
 523
 524         free_private_data(data);
 525 }
 526
 527 static int pptp_connect(struct vpn_provider *provider,
 528                         struct connman_task *task, const char *if_name,
 529                         vpn_provider_connect_cb_t cb, const char *dbus_sender,
 530                         void *user_data)
 531 {
 532         const char *username, *password;
 533         int err;
 534
 535         DBG("iface %s provider %p user %p", if_name, provider, user_data);
 536
 537         if (connman_task_set_notify(task, "getsec",
 538                                         pptp_get_sec, provider)) {
 539                 err = -ENOMEM;
 540                 goto error;
 541         }
 542
 543         username = vpn_provider_get_string(provider, "PPTP.User");
 544         password = vpn_provider_get_string(provider, "PPTP.Password");
 545
 546         DBG("user %s password %p", username, password);
 547
 548         if (!username || !password) {
 549                 struct pptp_private_data *data;
 550
 551                 data = g_try_new0(struct pptp_private_data, 1);
 552                 if (!data)
 553                         return -ENOMEM;
 554
 555                 data->task = task;
 556                 data->if_name = g_strdup(if_name);
 557                 data->cb = cb;
 558                 data->user_data = user_data;
 559
 560                 err = request_input(provider, request_input_cb, dbus_sender,
 561                                                                         data);
 562                 if (err != -EINPROGRESS) {
 563                         free_private_data(data);
 564                         goto done;
 565                 }
 566                 return err;
 567         }
 568
 569 done:
 570         return run_connect(provider, task, if_name, cb, user_data,
 571                                                         username, password);
 572
 573 error:
 574         if (cb)
 575                 cb(provider, user_data, err);
 576
 577         return err;
 578 }
 579
 580 static int pptp_error_code(struct vpn_provider *provider, int exit_code)
 581 {
 582
 583         switch (exit_code) {
 584         case 1:
 585                 return CONNMAN_PROVIDER_ERROR_CONNECT_FAILED;
 586         case 2:
 587                 return CONNMAN_PROVIDER_ERROR_LOGIN_FAILED;
 588         case 16:
 589                 return CONNMAN_PROVIDER_ERROR_AUTH_FAILED;
 590         default:
 591                 return CONNMAN_PROVIDER_ERROR_UNKNOWN;
 592         }
 593 }
 594
 595 static void pptp_disconnect(struct vpn_provider *provider)
 596 {
 597         vpn_provider_set_string(provider, "PPTP.Password", NULL);
 598 }
 599
 600 static struct vpn_driver vpn_driver = {
 601         .flags          = VPN_FLAG_NO_TUN,
 602         .notify         = pptp_notify,
 603         .connect        = pptp_connect,
 604         .error_code     = pptp_error_code,
 605         .save           = pptp_save,
 606         .disconnect     = pptp_disconnect,
 607 };
 608
 609 static int pptp_init(void)
 610 {
 611         connection = connman_dbus_get_connection();
 612
 613         return vpn_register("pptp", &vpn_driver, PPPD);
 614 }
 615
 616 static void pptp_exit(void)
 617 {
 618         vpn_unregister("pptp");
 619
 620         dbus_connection_unref(connection);
 621 }
 622
 623 CONNMAN_PLUGIN_DEFINE(pptp, "pptp plugin", VERSION,
 624         CONNMAN_PLUGIN_PRIORITY_DEFAULT, pptp_init, pptp_exit)