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