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         { "PPTP.EchoFailure", "lcp-echo-failure", "0", OPT_STRING },
  67         { "PPTP.EchoInterval", "lcp-echo-interval", "0", OPT_STRING },
  68         { "PPTP.Debug", "debug", NULL, OPT_STRING },
  69         { "PPTP.RefuseEAP", "refuse-eap", NULL, OPT_BOOL },
  70         { "PPTP.RefusePAP", "refuse-pap", NULL, OPT_BOOL },
  71         { "PPTP.RefuseCHAP", "refuse-chap", NULL, OPT_BOOL },
  72         { "PPTP.RefuseMSCHAP", "refuse-mschap", NULL, OPT_BOOL },
  73         { "PPTP.RefuseMSCHAP2", "refuse-mschapv2", NULL, OPT_BOOL },
  74         { "PPTP.NoBSDComp", "nobsdcomp", NULL, OPT_BOOL },
  75         { "PPTP.NoDeflate", "nodeflate", NULL, OPT_BOOL },
  76         { "PPTP.RequirMPPE", "require-mppe", NULL, OPT_BOOL },
  77         { "PPTP.RequirMPPE40", "require-mppe-40", NULL, OPT_BOOL },
  78         { "PPTP.RequirMPPE128", "require-mppe-128", NULL, OPT_BOOL },
  79         { "PPTP.RequirMPPEStateful", "mppe-stateful", NULL, OPT_BOOL },
  80         { "PPTP.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                 return VPN_STATE_AUTH_FAILURE;
 138
 139         if (strcmp(reason, "connect"))
 140                 return VPN_STATE_DISCONNECT;
 141
 142         dbus_message_iter_recurse(&iter, &dict);
 143
 144         while (dbus_message_iter_get_arg_type(&dict) == DBUS_TYPE_DICT_ENTRY) {
 145                 DBusMessageIter entry;
 146
 147                 dbus_message_iter_recurse(&dict, &entry);
 148                 dbus_message_iter_get_basic(&entry, &key);
 149                 dbus_message_iter_next(&entry);
 150                 dbus_message_iter_get_basic(&entry, &value);
 151
 152                 DBG("%s = %s", key, value);
 153
 154                 if (!strcmp(key, "INTERNAL_IP4_ADDRESS")) {
 155                         vpn_provider_set_string(provider, "Address", value);
 156                         addressv4 = g_strdup(value);
 157                 }
 158
 159                 if (!strcmp(key, "INTERNAL_IP4_NETMASK")) {
 160                         vpn_provider_set_string(provider, "Netmask", value);
 161                         netmask = g_strdup(value);
 162                 }
 163
 164                 if (!strcmp(key, "INTERNAL_IP4_DNS")) {
 165                         vpn_provider_set_string(provider, "DNS", value);
 166                         nameservers = g_strdup(value);
 167                 }
 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 != NULL)
 184                 ipaddress = connman_ipaddress_alloc(AF_INET);
 185
 186         g_free(ifname);
 187
 188         if (ipaddress == NULL) {
 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 != NULL) {
 198                 vpn_provider_set_string(provider, "Gateway", value);
 199                 gateway = g_strdup(value);
 200         }
 201
 202         if (addressv4 != NULL)
 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         int i;
 222
 223         for (i = 0; i < (int)ARRAY_SIZE(pptp_options); i++) {
 224                 if (strncmp(pptp_options[i].cm_opt, "PPTP.", 5) == 0) {
 225                         option = vpn_provider_get_string(provider,
 226                                                         pptp_options[i].cm_opt);
 227                         if (option == NULL)
 228                                 continue;
 229
 230                         g_key_file_set_string(keyfile,
 231                                         vpn_provider_get_save_group(provider),
 232                                         pptp_options[i].cm_opt, option);
 233                 }
 234         }
 235
 236         return 0;
 237 }
 238
 239 static void pptp_write_bool_option(struct connman_task *task,
 240                                 const char *key, const char *value)
 241 {
 242         if (key != NULL && value != NULL) {
 243                 if (strcasecmp(value, "yes") == 0 ||
 244                                 strcasecmp(value, "true") == 0 ||
 245                                 strcmp(value, "1") == 0)
 246                         connman_task_add_argument(task, key, NULL);
 247         }
 248 }
 249
 250 struct request_input_reply {
 251         struct vpn_provider *provider;
 252         vpn_provider_password_cb_t callback;
 253         void *user_data;
 254 };
 255
 256 static void request_input_reply(DBusMessage *reply, void *user_data)
 257 {
 258         struct request_input_reply *pptp_reply = user_data;
 259         const char *error = NULL;
 260         char *username = NULL, *password = NULL;
 261         char *key;
 262         DBusMessageIter iter, dict;
 263
 264         DBG("provider %p", pptp_reply->provider);
 265
 266         if (dbus_message_get_type(reply) == DBUS_MESSAGE_TYPE_ERROR) {
 267                 error = dbus_message_get_error_name(reply);
 268                 goto done;
 269         }
 270
 271         if (vpn_agent_check_reply_has_dict(reply) == FALSE)
 272                 goto done;
 273
 274         dbus_message_iter_init(reply, &iter);
 275         dbus_message_iter_recurse(&iter, &dict);
 276         while (dbus_message_iter_get_arg_type(&dict) == DBUS_TYPE_DICT_ENTRY) {
 277                 DBusMessageIter entry, value;
 278                 const char *str;
 279
 280                 dbus_message_iter_recurse(&dict, &entry);
 281                 if (dbus_message_iter_get_arg_type(&entry) != DBUS_TYPE_STRING)
 282                         break;
 283
 284                 dbus_message_iter_get_basic(&entry, &key);
 285
 286                 if (g_str_equal(key, "Username")) {
 287                         dbus_message_iter_next(&entry);
 288                         if (dbus_message_iter_get_arg_type(&entry)
 289                                                         != DBUS_TYPE_VARIANT)
 290                                 break;
 291                         dbus_message_iter_recurse(&entry, &value);
 292                         if (dbus_message_iter_get_arg_type(&value)
 293                                                         != DBUS_TYPE_STRING)
 294                                 break;
 295                         dbus_message_iter_get_basic(&value, &str);
 296                         username = g_strdup(str);
 297                 }
 298
 299                 if (g_str_equal(key, "Password")) {
 300                         dbus_message_iter_next(&entry);
 301                         if (dbus_message_iter_get_arg_type(&entry)
 302                                                         != DBUS_TYPE_VARIANT)
 303                                 break;
 304                         dbus_message_iter_recurse(&entry, &value);
 305                         if (dbus_message_iter_get_arg_type(&value)
 306                                                         != DBUS_TYPE_STRING)
 307                                 break;
 308                         dbus_message_iter_get_basic(&value, &str);
 309                         password = g_strdup(str);
 310                 }
 311
 312                 dbus_message_iter_next(&dict);
 313         }
 314
 315 done:
 316         pptp_reply->callback(pptp_reply->provider, username, password, error,
 317                                 pptp_reply->user_data);
 318
 319         g_free(username);
 320         g_free(password);
 321
 322         g_free(pptp_reply);
 323 }
 324
 325 typedef void (* request_cb_t)(struct vpn_provider *provider,
 326                                 const char *username, const char *password,
 327                                 const char *error, void *user_data);
 328
 329 static int request_input(struct vpn_provider *provider,
 330                                 request_cb_t callback, void *user_data)
 331 {
 332         DBusMessage *message;
 333         const char *path, *agent_sender, *agent_path;
 334         DBusMessageIter iter;
 335         DBusMessageIter dict;
 336         struct request_input_reply *pptp_reply;
 337         int err;
 338
 339         connman_agent_get_info(&agent_sender, &agent_path);
 340
 341         if (provider == NULL || agent_path == NULL || callback == NULL)
 342                 return -ESRCH;
 343
 344         message = dbus_message_new_method_call(agent_sender, agent_path,
 345                                         VPN_AGENT_INTERFACE,
 346                                         "RequestInput");
 347         if (message == NULL)
 348                 return -ENOMEM;
 349
 350         dbus_message_iter_init_append(message, &iter);
 351
 352         path = vpn_provider_get_path(provider);
 353         dbus_message_iter_append_basic(&iter,
 354                                 DBUS_TYPE_OBJECT_PATH, &path);
 355
 356         connman_dbus_dict_open(&iter, &dict);
 357
 358         vpn_agent_append_user_info(&dict, provider, "PPTP.User");
 359
 360         vpn_agent_append_host_and_name(&dict, provider);
 361
 362         connman_dbus_dict_close(&iter, &dict);
 363
 364         pptp_reply = g_try_new0(struct request_input_reply, 1);
 365         if (pptp_reply == NULL) {
 366                 dbus_message_unref(message);
 367                 return -ENOMEM;
 368         }
 369
 370         pptp_reply->provider = provider;
 371         pptp_reply->callback = callback;
 372         pptp_reply->user_data = user_data;
 373
 374         err = connman_agent_queue_message(provider, message,
 375                         connman_timeout_input_request(),
 376                         request_input_reply, pptp_reply);
 377         if (err < 0 && err != -EBUSY) {
 378                 DBG("error %d sending agent request", err);
 379                 dbus_message_unref(message);
 380                 g_free(pptp_reply);
 381                 return err;
 382         }
 383
 384         dbus_message_unref(message);
 385
 386         return -EINPROGRESS;
 387 }
 388
 389 static int run_connect(struct vpn_provider *provider,
 390                         struct connman_task *task, const char *if_name,
 391                         vpn_provider_connect_cb_t cb, void *user_data,
 392                         const char *username, const char *password)
 393 {
 394         const char *opt_s, *host;
 395         char *str;
 396         int err, i;
 397
 398         host = vpn_provider_get_string(provider, "Host");
 399         if (host == NULL) {
 400                 connman_error("Host not set; cannot enable VPN");
 401                 err = -EINVAL;
 402                 goto done;
 403         }
 404
 405         if (username == NULL || password == NULL) {
 406                 DBG("Cannot connect username %s password %p",
 407                                                 username, password);
 408                 err = -EINVAL;
 409                 goto done;
 410         }
 411
 412         vpn_provider_set_string(provider, "PPTP.User", username);
 413         vpn_provider_set_string(provider, "PPTP.Password", password);
 414
 415         DBG("username %s password %p", username, password);
 416
 417         str = g_strdup_printf("%s %s --nolaunchpppd --loglevel 2",
 418                                 PPTP, host);
 419         if (str == NULL) {
 420                 connman_error("can not allocate memory");
 421                 err = -ENOMEM;
 422                 goto done;
 423         }
 424
 425         connman_task_add_argument(task, "pty", str);
 426         g_free(str);
 427
 428         connman_task_add_argument(task, "nodetach", NULL);
 429         connman_task_add_argument(task, "lock", NULL);
 430         connman_task_add_argument(task, "usepeerdns", NULL);
 431         connman_task_add_argument(task, "noipdefault", NULL);
 432         connman_task_add_argument(task, "noauth", NULL);
 433         connman_task_add_argument(task, "nodefaultroute", NULL);
 434         connman_task_add_argument(task, "ipparam", "pptp_plugin");
 435
 436         for (i = 0; i < (int)ARRAY_SIZE(pptp_options); i++) {
 437                 opt_s = vpn_provider_get_string(provider,
 438                                         pptp_options[i].cm_opt);
 439                 if (opt_s == NULL)
 440                         opt_s = pptp_options[i].vpnc_default;
 441
 442                 if (opt_s == NULL)
 443                         continue;
 444
 445                 if (pptp_options[i].type == OPT_STRING)
 446                         connman_task_add_argument(task,
 447                                         pptp_options[i].pptp_opt, opt_s);
 448                 else if (pptp_options[i].type == OPT_BOOL)
 449                         pptp_write_bool_option(task,
 450                                         pptp_options[i].pptp_opt, opt_s);
 451         }
 452
 453         connman_task_add_argument(task, "plugin",
 454                                 SCRIPTDIR "/libppp-plugin.so");
 455
 456         err = connman_task_run(task, vpn_died, provider,
 457                                 NULL, NULL, NULL);
 458         if (err < 0) {
 459                 connman_error("pptp failed to start");
 460                 err = -EIO;
 461                 goto done;
 462         }
 463
 464 done:
 465         if (cb != NULL)
 466                 cb(provider, user_data, err);
 467
 468         return err;
 469 }
 470
 471 static void free_private_data(struct pptp_private_data *data)
 472 {
 473         g_free(data->if_name);
 474         g_free(data);
 475 }
 476
 477 static void request_input_cb(struct vpn_provider *provider,
 478                         const char *username,
 479                         const char *password,
 480                         const char *error, void *user_data)
 481 {
 482         struct pptp_private_data *data = user_data;
 483
 484         if (username == NULL || password == NULL)
 485                 DBG("Requesting username %s or password failed, error %s",
 486                         username, error);
 487         else if (error != NULL)
 488                 DBG("error %s", error);
 489
 490         run_connect(provider, data->task, data->if_name, data->cb,
 491                 data->user_data, username, password);
 492
 493         free_private_data(data);
 494 }
 495
 496 static int pptp_connect(struct vpn_provider *provider,
 497                         struct connman_task *task, const char *if_name,
 498                         vpn_provider_connect_cb_t cb, void *user_data)
 499 {
 500         const char *username, *password;
 501         int err;
 502
 503         DBG("iface %s provider %p user %p", if_name, provider, user_data);
 504
 505         if (connman_task_set_notify(task, "getsec",
 506                                         pptp_get_sec, provider)) {
 507                 err = -ENOMEM;
 508                 goto error;
 509         }
 510
 511         username = vpn_provider_get_string(provider, "PPTP.User");
 512         password = vpn_provider_get_string(provider, "PPTP.Password");
 513
 514         DBG("user %s password %p", username, password);
 515
 516         if (username == NULL || password == NULL) {
 517                 struct pptp_private_data *data;
 518
 519                 data = g_try_new0(struct pptp_private_data, 1);
 520                 if (data == NULL)
 521                         return -ENOMEM;
 522
 523                 data->task = task;
 524                 data->if_name = g_strdup(if_name);
 525                 data->cb = cb;
 526                 data->user_data = user_data;
 527
 528                 err = request_input(provider, request_input_cb, data);
 529                 if (err != -EINPROGRESS) {
 530                         free_private_data(data);
 531                         goto done;
 532                 }
 533                 return err;
 534         }
 535
 536 done:
 537         return run_connect(provider, task, if_name, cb, user_data,
 538                                                         username, password);
 539
 540 error:
 541         if (cb != NULL)
 542                 cb(provider, user_data, err);
 543
 544         return err;
 545 }
 546
 547 static int pptp_error_code(int exit_code)
 548 {
 549
 550         switch (exit_code) {
 551         case 1:
 552                 return CONNMAN_PROVIDER_ERROR_CONNECT_FAILED;
 553         case 2:
 554                 return CONNMAN_PROVIDER_ERROR_LOGIN_FAILED;
 555         case 16:
 556                 return CONNMAN_PROVIDER_ERROR_AUTH_FAILED;
 557         default:
 558                 return CONNMAN_PROVIDER_ERROR_UNKNOWN;
 559         }
 560 }
 561
 562 static void pptp_disconnect(struct vpn_provider *provider)
 563 {
 564         vpn_provider_set_string(provider, "PPTP.Password", NULL);
 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         .disconnect     = pptp_disconnect,
 574 };
 575
 576 static int pptp_init(void)
 577 {
 578         connection = connman_dbus_get_connection();
 579
 580         return vpn_register("pptp", &vpn_driver, PPPD);
 581 }
 582
 583 static void pptp_exit(void)
 584 {
 585         vpn_unregister("pptp");
 586
 587         dbus_connection_unref(connection);
 588 }
 589
 590 CONNMAN_PLUGIN_DEFINE(pptp, "pptp plugin", VERSION,
 591         CONNMAN_PLUGIN_PRIORITY_DEFAULT, pptp_init, pptp_exit)