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", "no-vj-comp", 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 (dbus_message_get_type(reply) == DBUS_MESSAGE_TYPE_ERROR) {
 293                 error = dbus_message_get_error_name(reply);
 294                 goto done;
 295         }
 296
 297         if (!vpn_agent_check_reply_has_dict(reply))
 298                 goto done;
 299
 300         dbus_message_iter_init(reply, &iter);
 301         dbus_message_iter_recurse(&iter, &dict);
 302         while (dbus_message_iter_get_arg_type(&dict) == DBUS_TYPE_DICT_ENTRY) {
 303                 DBusMessageIter entry, value;
 304                 const char *str;
 305
 306                 dbus_message_iter_recurse(&dict, &entry);
 307                 if (dbus_message_iter_get_arg_type(&entry) != DBUS_TYPE_STRING)
 308                         break;
 309
 310                 dbus_message_iter_get_basic(&entry, &key);
 311
 312                 if (g_str_equal(key, "Username")) {
 313                         dbus_message_iter_next(&entry);
 314                         if (dbus_message_iter_get_arg_type(&entry)
 315                                                         != DBUS_TYPE_VARIANT)
 316                                 break;
 317                         dbus_message_iter_recurse(&entry, &value);
 318                         if (dbus_message_iter_get_arg_type(&value)
 319                                                         != DBUS_TYPE_STRING)
 320                                 break;
 321                         dbus_message_iter_get_basic(&value, &str);
 322                         username = g_strdup(str);
 323                 }
 324
 325                 if (g_str_equal(key, "Password")) {
 326                         dbus_message_iter_next(&entry);
 327                         if (dbus_message_iter_get_arg_type(&entry)
 328                                                         != DBUS_TYPE_VARIANT)
 329                                 break;
 330                         dbus_message_iter_recurse(&entry, &value);
 331                         if (dbus_message_iter_get_arg_type(&value)
 332                                                         != DBUS_TYPE_STRING)
 333                                 break;
 334                         dbus_message_iter_get_basic(&value, &str);
 335                         password = g_strdup(str);
 336                 }
 337
 338                 dbus_message_iter_next(&dict);
 339         }
 340
 341 done:
 342         pptp_reply->callback(pptp_reply->provider, username, password, error,
 343                                 pptp_reply->user_data);
 344
 345         g_free(username);
 346         g_free(password);
 347
 348         g_free(pptp_reply);
 349 }
 350
 351 typedef void (* request_cb_t)(struct vpn_provider *provider,
 352                                 const char *username, const char *password,
 353                                 const char *error, void *user_data);
 354
 355 static int request_input(struct vpn_provider *provider,
 356                         request_cb_t callback, const char *dbus_sender,
 357                         void *user_data)
 358 {
 359         DBusMessage *message;
 360         const char *path, *agent_sender, *agent_path;
 361         DBusMessageIter iter;
 362         DBusMessageIter dict;
 363         struct request_input_reply *pptp_reply;
 364         int err;
 365         void *agent;
 366
 367         agent = connman_agent_get_info(dbus_sender, &agent_sender,
 368                                                         &agent_path);
 369         if (!provider || !agent || !agent_path || !callback)
 370                 return -ESRCH;
 371
 372         message = dbus_message_new_method_call(agent_sender, agent_path,
 373                                         VPN_AGENT_INTERFACE,
 374                                         "RequestInput");
 375         if (!message)
 376                 return -ENOMEM;
 377
 378         dbus_message_iter_init_append(message, &iter);
 379
 380         path = vpn_provider_get_path(provider);
 381         dbus_message_iter_append_basic(&iter,
 382                                 DBUS_TYPE_OBJECT_PATH, &path);
 383
 384         connman_dbus_dict_open(&iter, &dict);
 385
 386         vpn_agent_append_user_info(&dict, provider, "PPTP.User");
 387
 388         vpn_agent_append_host_and_name(&dict, provider);
 389
 390         connman_dbus_dict_close(&iter, &dict);
 391
 392         pptp_reply = g_try_new0(struct request_input_reply, 1);
 393         if (!pptp_reply) {
 394                 dbus_message_unref(message);
 395                 return -ENOMEM;
 396         }
 397
 398         pptp_reply->provider = provider;
 399         pptp_reply->callback = callback;
 400         pptp_reply->user_data = user_data;
 401
 402         err = connman_agent_queue_message(provider, message,
 403                         connman_timeout_input_request(),
 404                         request_input_reply, pptp_reply, agent);
 405         if (err < 0 && err != -EBUSY) {
 406                 DBG("error %d sending agent request", err);
 407                 dbus_message_unref(message);
 408                 g_free(pptp_reply);
 409                 return err;
 410         }
 411
 412         dbus_message_unref(message);
 413
 414         return -EINPROGRESS;
 415 }
 416
 417 static int run_connect(struct vpn_provider *provider,
 418                         struct connman_task *task, const char *if_name,
 419                         vpn_provider_connect_cb_t cb, void *user_data,
 420                         const char *username, const char *password)
 421 {
 422         const char *opt_s, *host;
 423         char *str;
 424         int err, i;
 425
 426         host = vpn_provider_get_string(provider, "Host");
 427         if (!host) {
 428                 connman_error("Host not set; cannot enable VPN");
 429                 err = -EINVAL;
 430                 goto done;
 431         }
 432
 433         if (!username || !password) {
 434                 DBG("Cannot connect username %s password %p",
 435                                                 username, password);
 436                 err = -EINVAL;
 437                 goto done;
 438         }
 439
 440         DBG("username %s password %p", username, password);
 441
 442         str = g_strdup_printf("%s %s --nolaunchpppd --loglevel 2",
 443                                 PPTP, host);
 444         if (!str) {
 445                 connman_error("can not allocate memory");
 446                 err = -ENOMEM;
 447                 goto done;
 448         }
 449
 450         connman_task_add_argument(task, "pty", str);
 451         g_free(str);
 452
 453         connman_task_add_argument(task, "nodetach", NULL);
 454         connman_task_add_argument(task, "lock", NULL);
 455         connman_task_add_argument(task, "usepeerdns", NULL);
 456         connman_task_add_argument(task, "noipdefault", NULL);
 457         connman_task_add_argument(task, "noauth", NULL);
 458         connman_task_add_argument(task, "nodefaultroute", NULL);
 459         connman_task_add_argument(task, "ipparam", "pptp_plugin");
 460
 461         for (i = 0; i < (int)ARRAY_SIZE(pptp_options); i++) {
 462                 opt_s = vpn_provider_get_string(provider,
 463                                         pptp_options[i].cm_opt);
 464                 if (!opt_s)
 465                         opt_s = pptp_options[i].vpnc_default;
 466
 467                 if (!opt_s)
 468                         continue;
 469
 470                 if (pptp_options[i].type == OPT_STRING)
 471                         connman_task_add_argument(task,
 472                                         pptp_options[i].pptp_opt, opt_s);
 473                 else if (pptp_options[i].type == OPT_BOOL)
 474                         pptp_write_bool_option(task,
 475                                         pptp_options[i].pptp_opt, opt_s);
 476         }
 477
 478         connman_task_add_argument(task, "plugin",
 479                                 SCRIPTDIR "/libppp-plugin.so");
 480
 481         err = connman_task_run(task, vpn_died, provider,
 482                                 NULL, NULL, NULL);
 483         if (err < 0) {
 484                 connman_error("pptp failed to start");
 485                 err = -EIO;
 486                 goto done;
 487         }
 488
 489 done:
 490         if (cb)
 491                 cb(provider, user_data, err);
 492
 493         return err;
 494 }
 495
 496 static void free_private_data(struct pptp_private_data *data)
 497 {
 498         g_free(data->if_name);
 499         g_free(data);
 500 }
 501
 502 static void request_input_cb(struct vpn_provider *provider,
 503                         const char *username,
 504                         const char *password,
 505                         const char *error, void *user_data)
 506 {
 507         struct pptp_private_data *data = user_data;
 508
 509         if (!username || !password)
 510                 DBG("Requesting username %s or password failed, error %s",
 511                         username, error);
 512         else if (error)
 513                 DBG("error %s", error);
 514
 515         vpn_provider_set_string(provider, "PPTP.User", username);
 516         vpn_provider_set_string_hide_value(provider, "PPTP.Password",
 517                                                                 password);
 518
 519         run_connect(provider, data->task, data->if_name, data->cb,
 520                 data->user_data, username, password);
 521
 522         free_private_data(data);
 523 }
 524
 525 static int pptp_connect(struct vpn_provider *provider,
 526                         struct connman_task *task, const char *if_name,
 527                         vpn_provider_connect_cb_t cb, const char *dbus_sender,
 528                         void *user_data)
 529 {
 530         const char *username, *password;
 531         int err;
 532
 533         DBG("iface %s provider %p user %p", if_name, provider, user_data);
 534
 535         if (connman_task_set_notify(task, "getsec",
 536                                         pptp_get_sec, provider)) {
 537                 err = -ENOMEM;
 538                 goto error;
 539         }
 540
 541         username = vpn_provider_get_string(provider, "PPTP.User");
 542         password = vpn_provider_get_string(provider, "PPTP.Password");
 543
 544         DBG("user %s password %p", username, password);
 545
 546         if (!username || !password) {
 547                 struct pptp_private_data *data;
 548
 549                 data = g_try_new0(struct pptp_private_data, 1);
 550                 if (!data)
 551                         return -ENOMEM;
 552
 553                 data->task = task;
 554                 data->if_name = g_strdup(if_name);
 555                 data->cb = cb;
 556                 data->user_data = user_data;
 557
 558                 err = request_input(provider, request_input_cb, dbus_sender,
 559                                                                         data);
 560                 if (err != -EINPROGRESS) {
 561                         free_private_data(data);
 562                         goto done;
 563                 }
 564                 return err;
 565         }
 566
 567 done:
 568         return run_connect(provider, task, if_name, cb, user_data,
 569                                                         username, password);
 570
 571 error:
 572         if (cb)
 573                 cb(provider, user_data, err);
 574
 575         return err;
 576 }
 577
 578 static int pptp_error_code(struct vpn_provider *provider, int exit_code)
 579 {
 580
 581         switch (exit_code) {
 582         case 1:
 583                 return CONNMAN_PROVIDER_ERROR_CONNECT_FAILED;
 584         case 2:
 585                 return CONNMAN_PROVIDER_ERROR_LOGIN_FAILED;
 586         case 16:
 587                 return CONNMAN_PROVIDER_ERROR_AUTH_FAILED;
 588         default:
 589                 return CONNMAN_PROVIDER_ERROR_UNKNOWN;
 590         }
 591 }
 592
 593 static void pptp_disconnect(struct vpn_provider *provider)
 594 {
 595         vpn_provider_set_string(provider, "PPTP.Password", NULL);
 596 }
 597
 598 static struct vpn_driver vpn_driver = {
 599         .flags          = VPN_FLAG_NO_TUN,
 600         .notify         = pptp_notify,
 601         .connect        = pptp_connect,
 602         .error_code     = pptp_error_code,
 603         .save           = pptp_save,
 604         .disconnect     = pptp_disconnect,
 605 };
 606
 607 static int pptp_init(void)
 608 {
 609         connection = connman_dbus_get_connection();
 610
 611         return vpn_register("pptp", &vpn_driver, PPPD);
 612 }
 613
 614 static void pptp_exit(void)
 615 {
 616         vpn_unregister("pptp");
 617
 618         dbus_connection_unref(connection);
 619 }
 620
 621 CONNMAN_PLUGIN_DEFINE(pptp, "pptp plugin", VERSION,
 622         CONNMAN_PLUGIN_PRIORITY_DEFAULT, pptp_init, pptp_exit)