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_hide_value(provider, "PPTP.Password",
 141                                         NULL);
 142
 143                 return VPN_STATE_AUTH_FAILURE;
 144         }
 145
 146         if (strcmp(reason, "connect"))
 147                 return VPN_STATE_DISCONNECT;
 148
 149         dbus_message_iter_recurse(&iter, &dict);
 150
 151         while (dbus_message_iter_get_arg_type(&dict) == DBUS_TYPE_DICT_ENTRY) {
 152                 DBusMessageIter entry;
 153
 154                 dbus_message_iter_recurse(&dict, &entry);
 155                 dbus_message_iter_get_basic(&entry, &key);
 156                 dbus_message_iter_next(&entry);
 157                 dbus_message_iter_get_basic(&entry, &value);
 158
 159                 DBG("%s = %s", key, value);
 160
 161                 if (!strcmp(key, "INTERNAL_IP4_ADDRESS"))
 162                         addressv4 = g_strdup(value);
 163
 164                 if (!strcmp(key, "INTERNAL_IP4_NETMASK"))
 165                         netmask = g_strdup(value);
 166
 167                 if (!strcmp(key, "INTERNAL_IP4_DNS"))
 168                         nameservers = g_strdup(value);
 169
 170                 if (!strcmp(key, "INTERNAL_IFNAME"))
 171                         ifname = g_strdup(value);
 172
 173                 dbus_message_iter_next(&dict);
 174         }
 175
 176         if (vpn_set_ifname(provider, ifname) < 0) {
 177                 g_free(ifname);
 178                 g_free(addressv4);
 179                 g_free(netmask);
 180                 g_free(nameservers);
 181                 return VPN_STATE_FAILURE;
 182         }
 183
 184         if (addressv4)
 185                 ipaddress = connman_ipaddress_alloc(AF_INET);
 186
 187         g_free(ifname);
 188
 189         if (!ipaddress) {
 190                 connman_error("No IP address for provider");
 191                 g_free(addressv4);
 192                 g_free(netmask);
 193                 g_free(nameservers);
 194                 return VPN_STATE_FAILURE;
 195         }
 196
 197         value = vpn_provider_get_string(provider, "HostIP");
 198         if (value) {
 199                 vpn_provider_set_string(provider, "Gateway", value);
 200                 gateway = g_strdup(value);
 201         }
 202
 203         if (addressv4)
 204                 connman_ipaddress_set_ipv4(ipaddress, addressv4, netmask,
 205                                         gateway);
 206
 207         vpn_provider_set_ipaddress(provider, ipaddress);
 208         vpn_provider_set_nameservers(provider, nameservers);
 209
 210         g_free(addressv4);
 211         g_free(netmask);
 212         g_free(gateway);
 213         g_free(nameservers);
 214         connman_ipaddress_free(ipaddress);
 215
 216         return VPN_STATE_CONNECT;
 217 }
 218
 219 static int pptp_save(struct vpn_provider *provider, GKeyFile *keyfile)
 220 {
 221         const char *option;
 222         bool pptp_option, pppd_option;
 223         int i;
 224
 225         for (i = 0; i < (int)ARRAY_SIZE(pptp_options); i++) {
 226                 pptp_option = pppd_option = false;
 227
 228                 if (strncmp(pptp_options[i].cm_opt, "PPTP.", 5) == 0)
 229                         pptp_option = true;
 230
 231                 if (strncmp(pptp_options[i].cm_opt, "PPPD.", 5) == 0)
 232                         pppd_option = true;
 233
 234                 if (pptp_option || pppd_option) {
 235                         option = vpn_provider_get_string(provider,
 236                                                         pptp_options[i].cm_opt);
 237                         if (!option) {
 238                                 /*
 239                                  * Check if the option prefix is PPTP as the
 240                                  * PPPD options were using PPTP prefix earlier.
 241                                  */
 242                                 char *pptp_str;
 243
 244                                 if (!pppd_option)
 245                                         continue;
 246
 247                                 pptp_str = g_strdup_printf("PPTP.%s",
 248                                                 &pptp_options[i].cm_opt[5]);
 249                                 option = vpn_provider_get_string(provider,
 250                                                                 pptp_str);
 251                                 g_free(pptp_str);
 252
 253                                 if (!option)
 254                                         continue;
 255                         }
 256
 257                         g_key_file_set_string(keyfile,
 258                                         vpn_provider_get_save_group(provider),
 259                                         pptp_options[i].cm_opt, option);
 260                 }
 261         }
 262
 263         return 0;
 264 }
 265
 266 static void pptp_write_bool_option(struct connman_task *task,
 267                                 const char *key, const char *value)
 268 {
 269         if (key && value) {
 270                 if (strcasecmp(value, "yes") == 0 ||
 271                                 strcasecmp(value, "true") == 0 ||
 272                                 strcmp(value, "1") == 0)
 273                         connman_task_add_argument(task, key, NULL);
 274         }
 275 }
 276
 277 struct request_input_reply {
 278         struct vpn_provider *provider;
 279         vpn_provider_password_cb_t callback;
 280         void *user_data;
 281 };
 282
 283 static void request_input_reply(DBusMessage *reply, void *user_data)
 284 {
 285         struct request_input_reply *pptp_reply = user_data;
 286         struct pptp_private_data *data;
 287         const char *error = NULL;
 288         char *username = NULL, *password = NULL;
 289         char *key;
 290         DBusMessageIter iter, dict;
 291         int err;
 292
 293         DBG("provider %p", pptp_reply->provider);
 294
 295         if (!reply)
 296                 goto done;
 297
 298         data = pptp_reply->user_data;
 299
 300         err = vpn_agent_check_and_process_reply_error(reply,
 301                                 pptp_reply->provider, data->task, data->cb,
 302                                 data->user_data);
 303         if (err) {
 304                 /* Ensure cb is called only once */
 305                 data->cb = NULL;
 306                 data->user_data = NULL;
 307                 error = dbus_message_get_error_name(reply);
 308                 goto done;
 309         }
 310
 311         if (!vpn_agent_check_reply_has_dict(reply))
 312                 goto done;
 313
 314         dbus_message_iter_init(reply, &iter);
 315         dbus_message_iter_recurse(&iter, &dict);
 316         while (dbus_message_iter_get_arg_type(&dict) == DBUS_TYPE_DICT_ENTRY) {
 317                 DBusMessageIter entry, value;
 318                 const char *str;
 319
 320                 dbus_message_iter_recurse(&dict, &entry);
 321                 if (dbus_message_iter_get_arg_type(&entry) != DBUS_TYPE_STRING)
 322                         break;
 323
 324                 dbus_message_iter_get_basic(&entry, &key);
 325
 326                 if (g_str_equal(key, "Username")) {
 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                         username = g_strdup(str);
 337                 }
 338
 339                 if (g_str_equal(key, "Password")) {
 340                         dbus_message_iter_next(&entry);
 341                         if (dbus_message_iter_get_arg_type(&entry)
 342                                                         != DBUS_TYPE_VARIANT)
 343                                 break;
 344                         dbus_message_iter_recurse(&entry, &value);
 345                         if (dbus_message_iter_get_arg_type(&value)
 346                                                         != DBUS_TYPE_STRING)
 347                                 break;
 348                         dbus_message_iter_get_basic(&value, &str);
 349                         password = g_strdup(str);
 350                 }
 351
 352                 dbus_message_iter_next(&dict);
 353         }
 354
 355 done:
 356         pptp_reply->callback(pptp_reply->provider, username, password, error,
 357                                 pptp_reply->user_data);
 358
 359         g_free(username);
 360         g_free(password);
 361
 362         g_free(pptp_reply);
 363 }
 364
 365 typedef void (* request_cb_t)(struct vpn_provider *provider,
 366                                 const char *username, const char *password,
 367                                 const char *error, void *user_data);
 368
 369 static int request_input(struct vpn_provider *provider,
 370                         request_cb_t callback, const char *dbus_sender,
 371                         void *user_data)
 372 {
 373         DBusMessage *message;
 374         const char *path, *agent_sender, *agent_path;
 375         DBusMessageIter iter;
 376         DBusMessageIter dict;
 377         struct request_input_reply *pptp_reply;
 378         int err;
 379         void *agent;
 380
 381         agent = connman_agent_get_info(dbus_sender, &agent_sender,
 382                                                         &agent_path);
 383         if (!provider || !agent || !agent_path || !callback)
 384                 return -ESRCH;
 385
 386         message = dbus_message_new_method_call(agent_sender, agent_path,
 387                                         VPN_AGENT_INTERFACE,
 388                                         "RequestInput");
 389         if (!message)
 390                 return -ENOMEM;
 391
 392         dbus_message_iter_init_append(message, &iter);
 393
 394         path = vpn_provider_get_path(provider);
 395         dbus_message_iter_append_basic(&iter,
 396                                 DBUS_TYPE_OBJECT_PATH, &path);
 397
 398         connman_dbus_dict_open(&iter, &dict);
 399
 400         if (vpn_provider_get_authentication_errors(provider))
 401                 vpn_agent_append_auth_failure(&dict, provider, NULL);
 402
 403         vpn_agent_append_user_info(&dict, provider, "PPTP.User");
 404
 405         vpn_agent_append_host_and_name(&dict, provider);
 406
 407         connman_dbus_dict_close(&iter, &dict);
 408
 409         pptp_reply = g_try_new0(struct request_input_reply, 1);
 410         if (!pptp_reply) {
 411                 dbus_message_unref(message);
 412                 return -ENOMEM;
 413         }
 414
 415         pptp_reply->provider = provider;
 416         pptp_reply->callback = callback;
 417         pptp_reply->user_data = user_data;
 418
 419         err = connman_agent_queue_message(provider, message,
 420                         connman_timeout_input_request(),
 421                         request_input_reply, pptp_reply, agent);
 422         if (err < 0 && err != -EBUSY) {
 423                 DBG("error %d sending agent request", err);
 424                 dbus_message_unref(message);
 425                 g_free(pptp_reply);
 426                 return err;
 427         }
 428
 429         dbus_message_unref(message);
 430
 431         return -EINPROGRESS;
 432 }
 433
 434 static int run_connect(struct vpn_provider *provider,
 435                         struct connman_task *task, const char *if_name,
 436                         vpn_provider_connect_cb_t cb, void *user_data,
 437                         const char *username, const char *password)
 438 {
 439         const char *opt_s, *host;
 440         char *str;
 441         int err, i;
 442
 443         if (!username || !password) {
 444                 DBG("Cannot connect username %s password %p",
 445                                                 username, password);
 446                 err = -EINVAL;
 447                 goto done;
 448         }
 449
 450         DBG("username %s password %p", username, password);
 451
 452         host = vpn_provider_get_string(provider, "Host");
 453         str = g_strdup_printf("%s %s --nolaunchpppd --loglevel 2",
 454                                 PPTP, host);
 455         if (!str) {
 456                 connman_error("can not allocate memory");
 457                 err = -ENOMEM;
 458                 goto done;
 459         }
 460
 461         connman_task_add_argument(task, "pty", str);
 462         g_free(str);
 463
 464         connman_task_add_argument(task, "nodetach", NULL);
 465         connman_task_add_argument(task, "lock", NULL);
 466         connman_task_add_argument(task, "logfd", "2");
 467         connman_task_add_argument(task, "usepeerdns", NULL);
 468         connman_task_add_argument(task, "noipdefault", NULL);
 469         connman_task_add_argument(task, "noauth", NULL);
 470         connman_task_add_argument(task, "nodefaultroute", NULL);
 471         connman_task_add_argument(task, "ipparam", "pptp_plugin");
 472
 473         for (i = 0; i < (int)ARRAY_SIZE(pptp_options); i++) {
 474                 opt_s = vpn_provider_get_string(provider,
 475                                         pptp_options[i].cm_opt);
 476                 if (!opt_s)
 477                         opt_s = pptp_options[i].vpnc_default;
 478
 479                 if (!opt_s)
 480                         continue;
 481
 482                 if (pptp_options[i].type == OPT_STRING)
 483                         connman_task_add_argument(task,
 484                                         pptp_options[i].pptp_opt, opt_s);
 485                 else if (pptp_options[i].type == OPT_BOOL)
 486                         pptp_write_bool_option(task,
 487                                         pptp_options[i].pptp_opt, opt_s);
 488         }
 489
 490         connman_task_add_argument(task, "plugin",
 491                                 SCRIPTDIR "/libppp-plugin.so");
 492
 493         err = connman_task_run(task, vpn_died, provider,
 494                                 NULL, NULL, NULL);
 495         if (err < 0) {
 496                 connman_error("pptp failed to start");
 497                 err = -EIO;
 498                 goto done;
 499         }
 500
 501 done:
 502         if (cb)
 503                 cb(provider, user_data, err);
 504
 505         return err;
 506 }
 507
 508 static void free_private_data(struct pptp_private_data *data)
 509 {
 510         g_free(data->if_name);
 511         g_free(data);
 512 }
 513
 514 static void request_input_cb(struct vpn_provider *provider,
 515                         const char *username,
 516                         const char *password,
 517                         const char *error, void *user_data)
 518 {
 519         struct pptp_private_data *data = user_data;
 520
 521         if (!username || !password)
 522                 DBG("Requesting username %s or password failed, error %s",
 523                         username, error);
 524         else if (error)
 525                 DBG("error %s", error);
 526
 527         vpn_provider_set_string(provider, "PPTP.User", username);
 528         vpn_provider_set_string_hide_value(provider, "PPTP.Password",
 529                                                                 password);
 530
 531         run_connect(provider, data->task, data->if_name, data->cb,
 532                 data->user_data, username, password);
 533
 534         free_private_data(data);
 535 }
 536
 537 static int pptp_connect(struct vpn_provider *provider,
 538                         struct connman_task *task, const char *if_name,
 539                         vpn_provider_connect_cb_t cb, const char *dbus_sender,
 540                         void *user_data)
 541 {
 542         const char *username, *password;
 543         int err;
 544
 545         DBG("iface %s provider %p user %p", if_name, provider, user_data);
 546
 547         if (connman_task_set_notify(task, "getsec",
 548                                         pptp_get_sec, provider)) {
 549                 err = -ENOMEM;
 550                 goto error;
 551         }
 552
 553         username = vpn_provider_get_string(provider, "PPTP.User");
 554         password = vpn_provider_get_string(provider, "PPTP.Password");
 555
 556         DBG("user %s password %p", username, password);
 557
 558         if (!username || !password) {
 559                 struct pptp_private_data *data;
 560
 561                 data = g_try_new0(struct pptp_private_data, 1);
 562                 if (!data)
 563                         return -ENOMEM;
 564
 565                 data->task = task;
 566                 data->if_name = g_strdup(if_name);
 567                 data->cb = cb;
 568                 data->user_data = user_data;
 569
 570                 err = request_input(provider, request_input_cb, dbus_sender,
 571                                                                         data);
 572                 if (err != -EINPROGRESS) {
 573                         free_private_data(data);
 574                         goto done;
 575                 }
 576                 return err;
 577         }
 578
 579 done:
 580         return run_connect(provider, task, if_name, cb, user_data,
 581                                                         username, password);
 582
 583 error:
 584         if (cb)
 585                 cb(provider, user_data, err);
 586
 587         return err;
 588 }
 589
 590 static int pptp_error_code(struct vpn_provider *provider, int exit_code)
 591 {
 592
 593         switch (exit_code) {
 594         case 1:
 595                 return CONNMAN_PROVIDER_ERROR_CONNECT_FAILED;
 596         case 2:
 597                 return CONNMAN_PROVIDER_ERROR_LOGIN_FAILED;
 598         case 16:
 599                 return CONNMAN_PROVIDER_ERROR_AUTH_FAILED;
 600         default:
 601                 return CONNMAN_PROVIDER_ERROR_UNKNOWN;
 602         }
 603 }
 604
 605 static void pptp_disconnect(struct vpn_provider *provider)
 606 {
 607         if (!provider)
 608                 return;
 609
 610         vpn_provider_set_string_hide_value(provider, "PPTP.Password", NULL);
 611
 612         connman_agent_cancel(provider);
 613 }
 614
 615 static struct vpn_driver vpn_driver = {
 616         .flags          = VPN_FLAG_NO_TUN,
 617         .notify         = pptp_notify,
 618         .connect        = pptp_connect,
 619         .error_code     = pptp_error_code,
 620         .save           = pptp_save,
 621         .disconnect     = pptp_disconnect,
 622 };
 623
 624 static int pptp_init(void)
 625 {
 626         connection = connman_dbus_get_connection();
 627
 628         return vpn_register("pptp", &vpn_driver, PPPD);
 629 }
 630
 631 static void pptp_exit(void)
 632 {
 633         vpn_unregister("pptp");
 634
 635         dbus_connection_unref(connection);
 636 }
 637
 638 CONNMAN_PLUGIN_DEFINE(pptp, "pptp plugin", VERSION,
 639         CONNMAN_PLUGIN_PRIORITY_DEFAULT, pptp_init, pptp_exit)