vpn/plugins/pptp.c

   1 /*
   2  *
   3  *  ConnMan VPN daemon
   4  *
   5  *  Copyright (C) 2010  BMW Car IT GmbH. All rights reserved.
   6  *  Copyright (C) 2012  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) == TRUE)
 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 == NULL || strlen(user) == 0 ||
 105                                 passwd == NULL || strlen(passwd) == 0)
 106                 return NULL;
 107
 108         reply = dbus_message_new_method_return(msg);
 109         if (reply == NULL)
 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 == NULL) {
 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                         vpn_provider_set_string(provider, "Address", value);
 162                         addressv4 = g_strdup(value);
 163                 }
 164
 165                 if (!strcmp(key, "INTERNAL_IP4_NETMASK")) {
 166                         vpn_provider_set_string(provider, "Netmask", value);
 167                         netmask = g_strdup(value);
 168                 }
 169
 170                 if (!strcmp(key, "INTERNAL_IP4_DNS")) {
 171                         vpn_provider_set_string(provider, "DNS", value);
 172                         nameservers = g_strdup(value);
 173                 }
 174
 175                 if (!strcmp(key, "INTERNAL_IFNAME"))
 176                         ifname = g_strdup(value);
 177
 178                 dbus_message_iter_next(&dict);
 179         }
 180
 181         if (vpn_set_ifname(provider, ifname) < 0) {
 182                 g_free(ifname);
 183                 g_free(addressv4);
 184                 g_free(netmask);
 185                 g_free(nameservers);
 186                 return VPN_STATE_FAILURE;
 187         }
 188
 189         if (addressv4 != NULL)
 190                 ipaddress = connman_ipaddress_alloc(AF_INET);
 191
 192         g_free(ifname);
 193
 194         if (ipaddress == NULL) {
 195                 connman_error("No IP address for provider");
 196                 g_free(addressv4);
 197                 g_free(netmask);
 198                 g_free(nameservers);
 199                 return VPN_STATE_FAILURE;
 200         }
 201
 202         value = vpn_provider_get_string(provider, "HostIP");
 203         if (value != NULL) {
 204                 vpn_provider_set_string(provider, "Gateway", value);
 205                 gateway = g_strdup(value);
 206         }
 207
 208         if (addressv4 != NULL)
 209                 connman_ipaddress_set_ipv4(ipaddress, addressv4, netmask,
 210                                         gateway);
 211
 212         vpn_provider_set_ipaddress(provider, ipaddress);
 213         vpn_provider_set_nameservers(provider, nameservers);
 214
 215         g_free(addressv4);
 216         g_free(netmask);
 217         g_free(gateway);
 218         g_free(nameservers);
 219         connman_ipaddress_free(ipaddress);
 220
 221         return VPN_STATE_CONNECT;
 222 }
 223
 224 static int pptp_save(struct vpn_provider *provider, GKeyFile *keyfile)
 225 {
 226         const char *option;
 227         connman_bool_t pptp_option, pppd_option;
 228         int i;
 229
 230         for (i = 0; i < (int)ARRAY_SIZE(pptp_options); i++) {
 231                 pptp_option = pppd_option = FALSE;
 232
 233                 if (strncmp(pptp_options[i].cm_opt, "PPTP.", 5) == 0)
 234                         pptp_option = TRUE;
 235
 236                 if (strncmp(pptp_options[i].cm_opt, "PPPD.", 5) == 0)
 237                         pppd_option = TRUE;
 238
 239                 if (pptp_option == TRUE || pppd_option == TRUE) {
 240                         option = vpn_provider_get_string(provider,
 241                                                         pptp_options[i].cm_opt);
 242                         if (option == NULL) {
 243                                 /*
 244                                  * Check if the option prefix is PPTP as the
 245                                  * PPPD options were using PPTP prefix earlier.
 246                                  */
 247                                 char *pptp_str;
 248
 249                                 if (pppd_option == FALSE)
 250                                         continue;
 251
 252                                 pptp_str = g_strdup_printf("PPTP.%s",
 253                                                 &pptp_options[i].cm_opt[5]);
 254                                 option = vpn_provider_get_string(provider,
 255                                                                 pptp_str);
 256                                 g_free(pptp_str);
 257
 258                                 if (option == NULL)
 259                                         continue;
 260                         }
 261
 262                         g_key_file_set_string(keyfile,
 263                                         vpn_provider_get_save_group(provider),
 264                                         pptp_options[i].cm_opt, option);
 265                 }
 266         }
 267
 268         return 0;
 269 }
 270
 271 static void pptp_write_bool_option(struct connman_task *task,
 272                                 const char *key, const char *value)
 273 {
 274         if (key != NULL && value != NULL) {
 275                 if (strcasecmp(value, "yes") == 0 ||
 276                                 strcasecmp(value, "true") == 0 ||
 277                                 strcmp(value, "1") == 0)
 278                         connman_task_add_argument(task, key, NULL);
 279         }
 280 }
 281
 282 struct request_input_reply {
 283         struct vpn_provider *provider;
 284         vpn_provider_password_cb_t callback;
 285         void *user_data;
 286 };
 287
 288 static void request_input_reply(DBusMessage *reply, void *user_data)
 289 {
 290         struct request_input_reply *pptp_reply = user_data;
 291         const char *error = NULL;
 292         char *username = NULL, *password = NULL;
 293         char *key;
 294         DBusMessageIter iter, dict;
 295
 296         DBG("provider %p", pptp_reply->provider);
 297
 298         if (dbus_message_get_type(reply) == DBUS_MESSAGE_TYPE_ERROR) {
 299                 error = dbus_message_get_error_name(reply);
 300                 goto done;
 301         }
 302
 303         if (vpn_agent_check_reply_has_dict(reply) == FALSE)
 304                 goto done;
 305
 306         dbus_message_iter_init(reply, &iter);
 307         dbus_message_iter_recurse(&iter, &dict);
 308         while (dbus_message_iter_get_arg_type(&dict) == DBUS_TYPE_DICT_ENTRY) {
 309                 DBusMessageIter entry, value;
 310                 const char *str;
 311
 312                 dbus_message_iter_recurse(&dict, &entry);
 313                 if (dbus_message_iter_get_arg_type(&entry) != DBUS_TYPE_STRING)
 314                         break;
 315
 316                 dbus_message_iter_get_basic(&entry, &key);
 317
 318                 if (g_str_equal(key, "Username")) {
 319                         dbus_message_iter_next(&entry);
 320                         if (dbus_message_iter_get_arg_type(&entry)
 321                                                         != DBUS_TYPE_VARIANT)
 322                                 break;
 323                         dbus_message_iter_recurse(&entry, &value);
 324                         if (dbus_message_iter_get_arg_type(&value)
 325                                                         != DBUS_TYPE_STRING)
 326                                 break;
 327                         dbus_message_iter_get_basic(&value, &str);
 328                         username = g_strdup(str);
 329                 }
 330
 331                 if (g_str_equal(key, "Password")) {
 332                         dbus_message_iter_next(&entry);
 333                         if (dbus_message_iter_get_arg_type(&entry)
 334                                                         != DBUS_TYPE_VARIANT)
 335                                 break;
 336                         dbus_message_iter_recurse(&entry, &value);
 337                         if (dbus_message_iter_get_arg_type(&value)
 338                                                         != DBUS_TYPE_STRING)
 339                                 break;
 340                         dbus_message_iter_get_basic(&value, &str);
 341                         password = g_strdup(str);
 342                 }
 343
 344                 dbus_message_iter_next(&dict);
 345         }
 346
 347 done:
 348         pptp_reply->callback(pptp_reply->provider, username, password, error,
 349                                 pptp_reply->user_data);
 350
 351         g_free(username);
 352         g_free(password);
 353
 354         g_free(pptp_reply);
 355 }
 356
 357 typedef void (* request_cb_t)(struct vpn_provider *provider,
 358                                 const char *username, const char *password,
 359                                 const char *error, void *user_data);
 360
 361 static int request_input(struct vpn_provider *provider,
 362                                 request_cb_t callback, void *user_data)
 363 {
 364         DBusMessage *message;
 365         const char *path, *agent_sender, *agent_path;
 366         DBusMessageIter iter;
 367         DBusMessageIter dict;
 368         struct request_input_reply *pptp_reply;
 369         int err;
 370
 371         connman_agent_get_info(&agent_sender, &agent_path);
 372
 373         if (provider == NULL || agent_path == NULL || callback == NULL)
 374                 return -ESRCH;
 375
 376         message = dbus_message_new_method_call(agent_sender, agent_path,
 377                                         VPN_AGENT_INTERFACE,
 378                                         "RequestInput");
 379         if (message == NULL)
 380                 return -ENOMEM;
 381
 382         dbus_message_iter_init_append(message, &iter);
 383
 384         path = vpn_provider_get_path(provider);
 385         dbus_message_iter_append_basic(&iter,
 386                                 DBUS_TYPE_OBJECT_PATH, &path);
 387
 388         connman_dbus_dict_open(&iter, &dict);
 389
 390         vpn_agent_append_user_info(&dict, provider, "PPTP.User");
 391
 392         vpn_agent_append_host_and_name(&dict, provider);
 393
 394         connman_dbus_dict_close(&iter, &dict);
 395
 396         pptp_reply = g_try_new0(struct request_input_reply, 1);
 397         if (pptp_reply == NULL) {
 398                 dbus_message_unref(message);
 399                 return -ENOMEM;
 400         }
 401
 402         pptp_reply->provider = provider;
 403         pptp_reply->callback = callback;
 404         pptp_reply->user_data = user_data;
 405
 406         err = connman_agent_queue_message(provider, message,
 407                         connman_timeout_input_request(),
 408                         request_input_reply, pptp_reply);
 409         if (err < 0 && err != -EBUSY) {
 410                 DBG("error %d sending agent request", err);
 411                 dbus_message_unref(message);
 412                 g_free(pptp_reply);
 413                 return err;
 414         }
 415
 416         dbus_message_unref(message);
 417
 418         return -EINPROGRESS;
 419 }
 420
 421 static int run_connect(struct vpn_provider *provider,
 422                         struct connman_task *task, const char *if_name,
 423                         vpn_provider_connect_cb_t cb, void *user_data,
 424                         const char *username, const char *password)
 425 {
 426         const char *opt_s, *host;
 427         char *str;
 428         int err, i;
 429
 430         host = vpn_provider_get_string(provider, "Host");
 431         if (host == NULL) {
 432                 connman_error("Host not set; cannot enable VPN");
 433                 err = -EINVAL;
 434                 goto done;
 435         }
 436
 437         if (username == NULL || password == NULL) {
 438                 DBG("Cannot connect username %s password %p",
 439                                                 username, password);
 440                 err = -EINVAL;
 441                 goto done;
 442         }
 443
 444         DBG("username %s password %p", username, password);
 445
 446         str = g_strdup_printf("%s %s --nolaunchpppd --loglevel 2",
 447                                 PPTP, host);
 448         if (str == NULL) {
 449                 connman_error("can not allocate memory");
 450                 err = -ENOMEM;
 451                 goto done;
 452         }
 453
 454         connman_task_add_argument(task, "pty", str);
 455         g_free(str);
 456
 457         connman_task_add_argument(task, "nodetach", NULL);
 458         connman_task_add_argument(task, "lock", NULL);
 459         connman_task_add_argument(task, "usepeerdns", NULL);
 460         connman_task_add_argument(task, "noipdefault", NULL);
 461         connman_task_add_argument(task, "noauth", NULL);
 462         connman_task_add_argument(task, "nodefaultroute", NULL);
 463         connman_task_add_argument(task, "ipparam", "pptp_plugin");
 464
 465         for (i = 0; i < (int)ARRAY_SIZE(pptp_options); i++) {
 466                 opt_s = vpn_provider_get_string(provider,
 467                                         pptp_options[i].cm_opt);
 468                 if (opt_s == NULL)
 469                         opt_s = pptp_options[i].vpnc_default;
 470
 471                 if (opt_s == NULL)
 472                         continue;
 473
 474                 if (pptp_options[i].type == OPT_STRING)
 475                         connman_task_add_argument(task,
 476                                         pptp_options[i].pptp_opt, opt_s);
 477                 else if (pptp_options[i].type == OPT_BOOL)
 478                         pptp_write_bool_option(task,
 479                                         pptp_options[i].pptp_opt, opt_s);
 480         }
 481
 482         connman_task_add_argument(task, "plugin",
 483                                 SCRIPTDIR "/libppp-plugin.so");
 484
 485         err = connman_task_run(task, vpn_died, provider,
 486                                 NULL, NULL, NULL);
 487         if (err < 0) {
 488                 connman_error("pptp failed to start");
 489                 err = -EIO;
 490                 goto done;
 491         }
 492
 493 done:
 494         if (cb != NULL)
 495                 cb(provider, user_data, err);
 496
 497         return err;
 498 }
 499
 500 static void free_private_data(struct pptp_private_data *data)
 501 {
 502         g_free(data->if_name);
 503         g_free(data);
 504 }
 505
 506 static void request_input_cb(struct vpn_provider *provider,
 507                         const char *username,
 508                         const char *password,
 509                         const char *error, void *user_data)
 510 {
 511         struct pptp_private_data *data = user_data;
 512
 513         if (username == NULL || password == NULL)
 514                 DBG("Requesting username %s or password failed, error %s",
 515                         username, error);
 516         else if (error != NULL)
 517                 DBG("error %s", error);
 518
 519         vpn_provider_set_string(provider, "PPTP.User", username);
 520         vpn_provider_set_string_hide_value(provider, "PPTP.Password",
 521                                                                 password);
 522
 523         run_connect(provider, data->task, data->if_name, data->cb,
 524                 data->user_data, username, password);
 525
 526         free_private_data(data);
 527 }
 528
 529 static int pptp_connect(struct vpn_provider *provider,
 530                         struct connman_task *task, const char *if_name,
 531                         vpn_provider_connect_cb_t cb, void *user_data)
 532 {
 533         const char *username, *password;
 534         int err;
 535
 536         DBG("iface %s provider %p user %p", if_name, provider, user_data);
 537
 538         if (connman_task_set_notify(task, "getsec",
 539                                         pptp_get_sec, provider)) {
 540                 err = -ENOMEM;
 541                 goto error;
 542         }
 543
 544         username = vpn_provider_get_string(provider, "PPTP.User");
 545         password = vpn_provider_get_string(provider, "PPTP.Password");
 546
 547         DBG("user %s password %p", username, password);
 548
 549         if (username == NULL || password == NULL) {
 550                 struct pptp_private_data *data;
 551
 552                 data = g_try_new0(struct pptp_private_data, 1);
 553                 if (data == NULL)
 554                         return -ENOMEM;
 555
 556                 data->task = task;
 557                 data->if_name = g_strdup(if_name);
 558                 data->cb = cb;
 559                 data->user_data = user_data;
 560
 561                 err = request_input(provider, request_input_cb, 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 != NULL)
 575                 cb(provider, user_data, err);
 576
 577         return err;
 578 }
 579
 580 static int pptp_error_code(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)