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         OPT_PPTP_ONLY = 3,
  58 };
  59
  60 struct {
  61         const char *cm_opt;
  62         const char *pptp_opt;
  63         const char *pptp_default;
  64         int type;
  65 } pptp_options[] = {
  66         { "PPTP.User", "user", NULL, OPT_STRING },
  67         { "PPTP.IdleWait", "--idle-wait", NULL, OPT_PPTP_ONLY},
  68         { "PPTP.MaxEchoWait", "--max-echo-wait", NULL, OPT_PPTP_ONLY},
  69         { "PPPD.EchoFailure", "lcp-echo-failure", "0", OPT_STRING },
  70         { "PPPD.EchoInterval", "lcp-echo-interval", "0", OPT_STRING },
  71         { "PPPD.Debug", "debug", NULL, OPT_STRING },
  72         { "PPPD.RefuseEAP", "refuse-eap", NULL, OPT_BOOL },
  73         { "PPPD.RefusePAP", "refuse-pap", NULL, OPT_BOOL },
  74         { "PPPD.RefuseCHAP", "refuse-chap", NULL, OPT_BOOL },
  75         { "PPPD.RefuseMSCHAP", "refuse-mschap", NULL, OPT_BOOL },
  76         { "PPPD.RefuseMSCHAP2", "refuse-mschapv2", NULL, OPT_BOOL },
  77         { "PPPD.NoBSDComp", "nobsdcomp", NULL, OPT_BOOL },
  78         { "PPPD.NoDeflate", "nodeflate", NULL, OPT_BOOL },
  79         { "PPPD.RequirMPPE", "require-mppe", NULL, OPT_BOOL },
  80         { "PPPD.RequirMPPE40", "require-mppe-40", NULL, OPT_BOOL },
  81         { "PPPD.RequirMPPE128", "require-mppe-128", NULL, OPT_BOOL },
  82         { "PPPD.RequirMPPEStateful", "mppe-stateful", NULL, OPT_BOOL },
  83         { "PPPD.NoVJ", "novj", NULL, OPT_BOOL },
  84 };
  85
  86 static DBusConnection *connection;
  87
  88 struct pptp_private_data {
  89         struct connman_task *task;
  90         char *if_name;
  91         vpn_provider_connect_cb_t cb;
  92         void *user_data;
  93 };
  94
  95 static DBusMessage *pptp_get_sec(struct connman_task *task,
  96                                 DBusMessage *msg, void *user_data)
  97 {
  98         const char *user, *passwd;
  99         struct vpn_provider *provider = user_data;
 100         DBusMessage *reply;
 101
 102         if (dbus_message_get_no_reply(msg))
 103                 return NULL;
 104
 105         user = vpn_provider_get_string(provider, "PPTP.User");
 106         passwd = vpn_provider_get_string(provider, "PPTP.Password");
 107         if (!user || strlen(user) == 0 ||
 108                                 !passwd || strlen(passwd) == 0)
 109                 return NULL;
 110
 111         reply = dbus_message_new_method_return(msg);
 112         if (!reply)
 113                 return NULL;
 114
 115         dbus_message_append_args(reply, DBUS_TYPE_STRING, &user,
 116                                 DBUS_TYPE_STRING, &passwd,
 117                                 DBUS_TYPE_INVALID);
 118         return reply;
 119 }
 120
 121 static int pptp_notify(DBusMessage *msg, struct vpn_provider *provider)
 122 {
 123         DBusMessageIter iter, dict;
 124         const char *reason, *key, *value;
 125         char *addressv4 = NULL, *netmask = NULL, *gateway = NULL;
 126         char *ifname = NULL, *nameservers = NULL;
 127         struct connman_ipaddress *ipaddress = NULL;
 128
 129         dbus_message_iter_init(msg, &iter);
 130
 131         dbus_message_iter_get_basic(&iter, &reason);
 132         dbus_message_iter_next(&iter);
 133
 134         if (!provider) {
 135                 connman_error("No provider found");
 136                 return VPN_STATE_FAILURE;
 137         }
 138
 139         if (strcmp(reason, "auth failed") == 0) {
 140                 DBG("authentication failure");
 141
 142                 vpn_provider_set_string(provider, "PPTP.User", NULL);
 143                 vpn_provider_set_string_hide_value(provider, "PPTP.Password",
 144                                         NULL);
 145
 146                 return VPN_STATE_AUTH_FAILURE;
 147         }
 148
 149         if (strcmp(reason, "connect"))
 150                 return VPN_STATE_DISCONNECT;
 151
 152         dbus_message_iter_recurse(&iter, &dict);
 153
 154         while (dbus_message_iter_get_arg_type(&dict) == DBUS_TYPE_DICT_ENTRY) {
 155                 DBusMessageIter entry;
 156
 157                 dbus_message_iter_recurse(&dict, &entry);
 158                 dbus_message_iter_get_basic(&entry, &key);
 159                 dbus_message_iter_next(&entry);
 160                 dbus_message_iter_get_basic(&entry, &value);
 161
 162                 DBG("%s = %s", key, value);
 163
 164                 if (!strcmp(key, "INTERNAL_IP4_ADDRESS"))
 165                         addressv4 = g_strdup(value);
 166
 167                 if (!strcmp(key, "INTERNAL_IP4_NETMASK"))
 168                         netmask = g_strdup(value);
 169
 170                 if (!strcmp(key, "INTERNAL_IP4_DNS"))
 171                         nameservers = g_strdup(value);
 172
 173                 if (!strcmp(key, "INTERNAL_IFNAME"))
 174                         ifname = g_strdup(value);
 175
 176                 dbus_message_iter_next(&dict);
 177         }
 178
 179         if (vpn_set_ifname(provider, ifname) < 0) {
 180                 g_free(ifname);
 181                 g_free(addressv4);
 182                 g_free(netmask);
 183                 g_free(nameservers);
 184                 return VPN_STATE_FAILURE;
 185         }
 186
 187         if (addressv4)
 188                 ipaddress = connman_ipaddress_alloc(AF_INET);
 189
 190         g_free(ifname);
 191
 192         if (!ipaddress) {
 193                 connman_error("No IP address for provider");
 194                 g_free(addressv4);
 195                 g_free(netmask);
 196                 g_free(nameservers);
 197                 return VPN_STATE_FAILURE;
 198         }
 199
 200         value = vpn_provider_get_string(provider, "HostIP");
 201         if (value) {
 202                 vpn_provider_set_string(provider, "Gateway", value);
 203                 gateway = g_strdup(value);
 204         }
 205
 206         if (addressv4)
 207                 connman_ipaddress_set_ipv4(ipaddress, addressv4, netmask,
 208                                         gateway);
 209
 210         connman_ipaddress_set_p2p(ipaddress, true);
 211         vpn_provider_set_ipaddress(provider, ipaddress);
 212         vpn_provider_set_nameservers(provider, nameservers);
 213
 214         g_free(addressv4);
 215         g_free(netmask);
 216         g_free(gateway);
 217         g_free(nameservers);
 218         connman_ipaddress_free(ipaddress);
 219
 220         return VPN_STATE_CONNECT;
 221 }
 222
 223 static int pptp_save(struct vpn_provider *provider, GKeyFile *keyfile)
 224 {
 225         const char *option;
 226         bool pptp_option, pppd_option;
 227         int i;
 228
 229         for (i = 0; i < (int)ARRAY_SIZE(pptp_options); i++) {
 230                 pptp_option = pppd_option = false;
 231
 232                 if (strncmp(pptp_options[i].cm_opt, "PPTP.", 5) == 0)
 233                         pptp_option = true;
 234
 235                 if (strncmp(pptp_options[i].cm_opt, "PPPD.", 5) == 0)
 236                         pppd_option = true;
 237
 238                 if (pptp_option || pppd_option) {
 239                         option = vpn_provider_get_string(provider,
 240                                                         pptp_options[i].cm_opt);
 241                         if (!option) {
 242                                 /*
 243                                  * Check if the option prefix is PPTP as the
 244                                  * PPPD options were using PPTP prefix earlier.
 245                                  */
 246                                 char *pptp_str;
 247
 248                                 if (!pppd_option)
 249                                         continue;
 250
 251                                 pptp_str = g_strdup_printf("PPTP.%s",
 252                                                 &pptp_options[i].cm_opt[5]);
 253                                 option = vpn_provider_get_string(provider,
 254                                                                 pptp_str);
 255                                 g_free(pptp_str);
 256
 257                                 if (!option)
 258                                         continue;
 259                         }
 260
 261                         g_key_file_set_string(keyfile,
 262                                         vpn_provider_get_save_group(provider),
 263                                         pptp_options[i].cm_opt, option);
 264                 }
 265         }
 266
 267         return 0;
 268 }
 269
 270 static void pptp_write_bool_option(struct connman_task *task,
 271                                 const char *key, const char *value)
 272 {
 273         if (key && value) {
 274                 if (strcasecmp(value, "yes") == 0 ||
 275                                 strcasecmp(value, "true") == 0 ||
 276                                 strcmp(value, "1") == 0)
 277                         connman_task_add_argument(task, key, NULL);
 278         }
 279 }
 280
 281 struct request_input_reply {
 282         struct vpn_provider *provider;
 283         vpn_provider_password_cb_t callback;
 284         void *user_data;
 285 };
 286
 287 static void request_input_reply(DBusMessage *reply, void *user_data)
 288 {
 289         struct request_input_reply *pptp_reply = user_data;
 290         struct pptp_private_data *data;
 291         const char *error = NULL;
 292         char *username = NULL, *password = NULL;
 293         char *key;
 294         DBusMessageIter iter, dict;
 295         int err;
 296
 297         DBG("provider %p", pptp_reply->provider);
 298
 299         if (!reply)
 300                 goto done;
 301
 302         data = pptp_reply->user_data;
 303
 304         err = vpn_agent_check_and_process_reply_error(reply,
 305                                 pptp_reply->provider, data->task, data->cb,
 306                                 data->user_data);
 307         if (err) {
 308                 /* Ensure cb is called only once */
 309                 data->cb = NULL;
 310                 data->user_data = NULL;
 311                 error = dbus_message_get_error_name(reply);
 312                 goto done;
 313         }
 314
 315         if (!vpn_agent_check_reply_has_dict(reply))
 316                 goto done;
 317
 318         dbus_message_iter_init(reply, &iter);
 319         dbus_message_iter_recurse(&iter, &dict);
 320         while (dbus_message_iter_get_arg_type(&dict) == DBUS_TYPE_DICT_ENTRY) {
 321                 DBusMessageIter entry, value;
 322                 const char *str;
 323
 324                 dbus_message_iter_recurse(&dict, &entry);
 325                 if (dbus_message_iter_get_arg_type(&entry) != DBUS_TYPE_STRING)
 326                         break;
 327
 328                 dbus_message_iter_get_basic(&entry, &key);
 329
 330                 if (g_str_equal(key, "Username")) {
 331                         dbus_message_iter_next(&entry);
 332                         if (dbus_message_iter_get_arg_type(&entry)
 333                                                         != DBUS_TYPE_VARIANT)
 334                                 break;
 335                         dbus_message_iter_recurse(&entry, &value);
 336                         if (dbus_message_iter_get_arg_type(&value)
 337                                                         != DBUS_TYPE_STRING)
 338                                 break;
 339                         dbus_message_iter_get_basic(&value, &str);
 340                         username = g_strdup(str);
 341                 }
 342
 343                 if (g_str_equal(key, "Password")) {
 344                         dbus_message_iter_next(&entry);
 345                         if (dbus_message_iter_get_arg_type(&entry)
 346                                                         != DBUS_TYPE_VARIANT)
 347                                 break;
 348                         dbus_message_iter_recurse(&entry, &value);
 349                         if (dbus_message_iter_get_arg_type(&value)
 350                                                         != DBUS_TYPE_STRING)
 351                                 break;
 352                         dbus_message_iter_get_basic(&value, &str);
 353                         password = g_strdup(str);
 354                 }
 355
 356                 dbus_message_iter_next(&dict);
 357         }
 358
 359 done:
 360         pptp_reply->callback(pptp_reply->provider, username, password, error,
 361                                 pptp_reply->user_data);
 362
 363         g_free(username);
 364         g_free(password);
 365
 366         g_free(pptp_reply);
 367 }
 368
 369 typedef void (* request_cb_t)(struct vpn_provider *provider,
 370                                 const char *username, const char *password,
 371                                 const char *error, void *user_data);
 372
 373 static int request_input(struct vpn_provider *provider,
 374                         request_cb_t callback, const char *dbus_sender,
 375                         void *user_data)
 376 {
 377         DBusMessage *message;
 378         const char *path, *agent_sender, *agent_path;
 379         DBusMessageIter iter;
 380         DBusMessageIter dict;
 381         struct request_input_reply *pptp_reply;
 382         int err;
 383         void *agent;
 384
 385         agent = connman_agent_get_info(dbus_sender, &agent_sender,
 386                                                         &agent_path);
 387         if (!provider || !agent || !agent_path || !callback)
 388                 return -ESRCH;
 389
 390         message = dbus_message_new_method_call(agent_sender, agent_path,
 391                                         VPN_AGENT_INTERFACE,
 392                                         "RequestInput");
 393         if (!message)
 394                 return -ENOMEM;
 395
 396         dbus_message_iter_init_append(message, &iter);
 397
 398         path = vpn_provider_get_path(provider);
 399         dbus_message_iter_append_basic(&iter,
 400                                 DBUS_TYPE_OBJECT_PATH, &path);
 401
 402         connman_dbus_dict_open(&iter, &dict);
 403
 404         if (vpn_provider_get_authentication_errors(provider))
 405                 vpn_agent_append_auth_failure(&dict, provider, NULL);
 406
 407         vpn_agent_append_user_info(&dict, provider, "PPTP.User");
 408
 409         vpn_agent_append_host_and_name(&dict, provider);
 410
 411         connman_dbus_dict_close(&iter, &dict);
 412
 413         pptp_reply = g_try_new0(struct request_input_reply, 1);
 414         if (!pptp_reply) {
 415                 dbus_message_unref(message);
 416                 return -ENOMEM;
 417         }
 418
 419         pptp_reply->provider = provider;
 420         pptp_reply->callback = callback;
 421         pptp_reply->user_data = user_data;
 422
 423         err = connman_agent_queue_message(provider, message,
 424                         connman_timeout_input_request(),
 425                         request_input_reply, pptp_reply, agent);
 426         if (err < 0 && err != -EBUSY) {
 427                 DBG("error %d sending agent request", err);
 428                 dbus_message_unref(message);
 429                 g_free(pptp_reply);
 430                 return err;
 431         }
 432
 433         dbus_message_unref(message);
 434
 435         return -EINPROGRESS;
 436 }
 437
 438 static int run_connect(struct vpn_provider *provider,
 439                         struct connman_task *task, const char *if_name,
 440                         vpn_provider_connect_cb_t cb, void *user_data,
 441                         const char *username, const char *password)
 442 {
 443         GString *pptp_opt_s;
 444         const char *opt_s;
 445         const char *host;
 446         char *str;
 447         int err, i;
 448
 449         if (!username || !password) {
 450                 DBG("Cannot connect username %s password %p",
 451                                                 username, password);
 452                 err = -EINVAL;
 453                 goto done;
 454         }
 455
 456         DBG("username %s password %p", username, password);
 457
 458         host = vpn_provider_get_string(provider, "Host");
 459
 460         /* Create PPTP options for pppd "pty" */
 461         pptp_opt_s = g_string_new(NULL);
 462         g_string_append_printf(pptp_opt_s, "%s %s --nolaunchpppd --loglevel 2",
 463                                 PPTP, host);
 464
 465         connman_task_add_argument(task, "nodetach", NULL);
 466         connman_task_add_argument(task, "lock", NULL);
 467         connman_task_add_argument(task, "logfd", "2");
 468         connman_task_add_argument(task, "usepeerdns", NULL);
 469         connman_task_add_argument(task, "noipdefault", NULL);
 470         connman_task_add_argument(task, "noauth", NULL);
 471         connman_task_add_argument(task, "nodefaultroute", NULL);
 472         connman_task_add_argument(task, "ipparam", "pptp_plugin");
 473
 474         for (i = 0; i < (int)ARRAY_SIZE(pptp_options); i++) {
 475                 opt_s = vpn_provider_get_string(provider,
 476                                         pptp_options[i].cm_opt);
 477                 if (!opt_s)
 478                         opt_s = pptp_options[i].pptp_default;
 479
 480                 if (!opt_s)
 481                         continue;
 482
 483                 if (pptp_options[i].type == OPT_STRING)
 484                         connman_task_add_argument(task,
 485                                         pptp_options[i].pptp_opt, opt_s);
 486                 else if (pptp_options[i].type == OPT_BOOL)
 487                         pptp_write_bool_option(task,
 488                                         pptp_options[i].pptp_opt, opt_s);
 489                 else if (pptp_options[i].type == OPT_PPTP_ONLY)
 490                         g_string_append_printf(pptp_opt_s, " %s %s",
 491                                         pptp_options[i].pptp_opt, opt_s);
 492         }
 493
 494         str = g_string_free(pptp_opt_s, FALSE);
 495         connman_task_add_argument(task, "pty", str);
 496         g_free(str);
 497
 498         connman_task_add_argument(task, "plugin",
 499                                 SCRIPTDIR "/libppp-plugin.so");
 500
 501         err = connman_task_run(task, vpn_died, provider,
 502                                 NULL, NULL, NULL);
 503         if (err < 0) {
 504                 connman_error("pptp failed to start");
 505                 err = -EIO;
 506                 goto done;
 507         }
 508
 509 done:
 510         if (cb)
 511                 cb(provider, user_data, err);
 512
 513         return err;
 514 }
 515
 516 static void free_private_data(struct pptp_private_data *data)
 517 {
 518         g_free(data->if_name);
 519         g_free(data);
 520 }
 521
 522 static void request_input_cb(struct vpn_provider *provider,
 523                         const char *username,
 524                         const char *password,
 525                         const char *error, void *user_data)
 526 {
 527         struct pptp_private_data *data = user_data;
 528
 529         if (!username || !password)
 530                 DBG("Requesting username %s or password failed, error %s",
 531                         username, error);
 532         else if (error)
 533                 DBG("error %s", error);
 534
 535         vpn_provider_set_string(provider, "PPTP.User", username);
 536         vpn_provider_set_string_hide_value(provider, "PPTP.Password",
 537                                                                 password);
 538
 539         run_connect(provider, data->task, data->if_name, data->cb,
 540                 data->user_data, username, password);
 541
 542         free_private_data(data);
 543 }
 544
 545 static int pptp_connect(struct vpn_provider *provider,
 546                         struct connman_task *task, const char *if_name,
 547                         vpn_provider_connect_cb_t cb, const char *dbus_sender,
 548                         void *user_data)
 549 {
 550         const char *username, *password;
 551         int err;
 552
 553         DBG("iface %s provider %p user %p", if_name, provider, user_data);
 554
 555         if (connman_task_set_notify(task, "getsec",
 556                                         pptp_get_sec, provider)) {
 557                 err = -ENOMEM;
 558                 goto error;
 559         }
 560
 561         username = vpn_provider_get_string(provider, "PPTP.User");
 562         password = vpn_provider_get_string(provider, "PPTP.Password");
 563
 564         DBG("user %s password %p", username, password);
 565
 566         if (!username || !password) {
 567                 struct pptp_private_data *data;
 568
 569                 data = g_try_new0(struct pptp_private_data, 1);
 570                 if (!data)
 571                         return -ENOMEM;
 572
 573                 data->task = task;
 574                 data->if_name = g_strdup(if_name);
 575                 data->cb = cb;
 576                 data->user_data = user_data;
 577
 578                 err = request_input(provider, request_input_cb, dbus_sender,
 579                                                                         data);
 580                 if (err != -EINPROGRESS) {
 581                         free_private_data(data);
 582                         goto done;
 583                 }
 584                 return err;
 585         }
 586
 587 done:
 588         return run_connect(provider, task, if_name, cb, user_data,
 589                                                         username, password);
 590
 591 error:
 592         if (cb)
 593                 cb(provider, user_data, err);
 594
 595         return err;
 596 }
 597
 598 static int pptp_error_code(struct vpn_provider *provider, int exit_code)
 599 {
 600
 601         switch (exit_code) {
 602         case 1:
 603                 return CONNMAN_PROVIDER_ERROR_CONNECT_FAILED;
 604         case 2:
 605                 return CONNMAN_PROVIDER_ERROR_LOGIN_FAILED;
 606         case 16:
 607                 return CONNMAN_PROVIDER_ERROR_AUTH_FAILED;
 608         default:
 609                 return CONNMAN_PROVIDER_ERROR_UNKNOWN;
 610         }
 611 }
 612
 613 static void pptp_disconnect(struct vpn_provider *provider)
 614 {
 615         if (!provider)
 616                 return;
 617
 618         vpn_provider_set_string_hide_value(provider, "PPTP.Password", NULL);
 619
 620         connman_agent_cancel(provider);
 621 }
 622
 623 static struct vpn_driver vpn_driver = {
 624         .flags          = VPN_FLAG_NO_TUN,
 625         .notify         = pptp_notify,
 626         .connect        = pptp_connect,
 627         .error_code     = pptp_error_code,
 628         .save           = pptp_save,
 629         .disconnect     = pptp_disconnect,
 630 };
 631
 632 static int pptp_init(void)
 633 {
 634         connection = connman_dbus_get_connection();
 635
 636         return vpn_register("pptp", &vpn_driver, PPPD);
 637 }
 638
 639 static void pptp_exit(void)
 640 {
 641         vpn_unregister("pptp");
 642
 643         dbus_connection_unref(connection);
 644 }
 645
 646 CONNMAN_PLUGIN_DEFINE(pptp, "pptp plugin", VERSION,
 647         CONNMAN_PLUGIN_PRIORITY_DEFAULT, pptp_init, pptp_exit)