vpn/plugins/l2tp.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 <sys/types.h>
  31 #include <sys/stat.h>
  32 #include <fcntl.h>
  33
  34 #include <stdio.h>
  35 #include <net/if.h>
  36
  37 #include <dbus/dbus.h>
  38 #include <glib.h>
  39
  40 #define CONNMAN_API_SUBJECT_TO_CHANGE
  41 #include <connman/plugin.h>
  42 #include <connman/provider.h>
  43 #include <connman/log.h>
  44 #include <connman/task.h>
  45 #include <connman/dbus.h>
  46 #include <connman/inet.h>
  47
  48 #include "vpn.h"
  49
  50 #define ARRAY_SIZE(a) (sizeof(a)/sizeof(a[0]))
  51
  52 enum {
  53         OPT_STRING = 1,
  54         OPT_BOOL = 2,
  55 };
  56
  57 enum {
  58         OPT_ALL = 1,
  59         OPT_L2G = 2,
  60         OPT_L2  = 3,
  61         OPT_PPPD = 4,
  62 };
  63
  64 struct {
  65         const char *cm_opt;
  66         const char *pppd_opt;
  67         int sub;
  68         const char *vpn_default;
  69         int type;
  70 } pppd_options[] = {
  71         { "L2TP.User", "name", OPT_ALL, NULL, OPT_STRING },
  72         { "L2TP.BPS", "bps", OPT_L2, NULL, OPT_STRING },
  73         { "L2TP.LengthBit", "length bit", OPT_L2, NULL, OPT_STRING },
  74         { "L2TP.Challenge", "challenge", OPT_L2, NULL, OPT_STRING },
  75         { "L2TP.DefaultRoute", "defaultroute", OPT_L2, NULL, OPT_STRING },
  76         { "L2TP.FlowBit", "flow bit", OPT_L2, NULL, OPT_STRING },
  77         { "L2TP.TunnelRWS", "tunnel rws", OPT_L2, NULL, OPT_STRING },
  78         { "L2TP.Exclusive", "exclusive", OPT_L2, NULL, OPT_STRING },
  79         { "L2TP.Autodial", "autodial", OPT_L2, "yes", OPT_STRING },
  80         { "L2TP.Redial", "redial", OPT_L2, "yes", OPT_STRING },
  81         { "L2TP.RedialTimeout", "redial timeout", OPT_L2, "10", OPT_STRING },
  82         { "L2TP.MaxRedials", "max redials", OPT_L2, NULL, OPT_STRING },
  83         { "L2TP.RequirePAP", "require pap", OPT_L2, "no", OPT_STRING },
  84         { "L2TP.RequireCHAP", "require chap", OPT_L2, "yes", OPT_STRING },
  85         { "L2TP.ReqAuth", "require authentication", OPT_L2, "no", OPT_STRING },
  86         { "L2TP.AccessControl", "access control", OPT_L2G, "yes", OPT_STRING },
  87         { "L2TP.AuthFile", "auth file", OPT_L2G, NULL, OPT_STRING },
  88         { "L2TP.ForceUserSpace", "force userspace", OPT_L2G, NULL, OPT_STRING },
  89         { "L2TP.ListenAddr", "listen-addr", OPT_L2G, NULL, OPT_STRING },
  90         { "L2TP.Rand Source", "rand source", OPT_L2G, NULL, OPT_STRING },
  91         { "L2TP.IPsecSaref", "ipsec saref", OPT_L2G, NULL, OPT_STRING },
  92         { "L2TP.Port", "port", OPT_L2G, NULL, OPT_STRING },
  93         { "L2TP.EchoFailure", "lcp-echo-failure", OPT_PPPD, "0", OPT_STRING },
  94         { "L2TP.EchoInterval", "lcp-echo-interval", OPT_PPPD, "0", OPT_STRING },
  95         { "L2TP.Debug", "debug", OPT_PPPD, NULL, OPT_STRING },
  96         { "L2TP.RefuseEAP", "refuse-eap", OPT_PPPD, NULL, OPT_BOOL },
  97         { "L2TP.RefusePAP", "refuse-pap", OPT_PPPD, NULL, OPT_BOOL },
  98         { "L2TP.RefuseCHAP", "refuse-chap", OPT_PPPD, NULL, OPT_BOOL },
  99         { "L2TP.RefuseMSCHAP", "refuse-mschap", OPT_PPPD, NULL, OPT_BOOL },
 100         { "L2TP.RefuseMSCHAP2", "refuse-mschapv2", OPT_PPPD, NULL, OPT_BOOL },
 101         { "L2TP.NoBSDComp", "nobsdcomp", OPT_PPPD, NULL, OPT_BOOL },
 102         { "L2TP.NoPcomp", "nopcomp", OPT_PPPD, NULL, OPT_BOOL },
 103         { "L2TP.UseAccomp", "accomp", OPT_PPPD, NULL, OPT_BOOL },
 104         { "L2TP.NoDeflate", "nodeflatey", OPT_PPPD, NULL, OPT_BOOL },
 105         { "L2TP.ReqMPPE", "require-mppe", OPT_PPPD, NULL, OPT_BOOL },
 106         { "L2TP.ReqMPPE40", "require-mppe-40", OPT_PPPD, NULL, OPT_BOOL },
 107         { "L2TP.ReqMPPE128", "require-mppe-128", OPT_PPPD, NULL, OPT_BOOL },
 108         { "L2TP.ReqMPPEStateful", "mppe-stateful", OPT_PPPD, NULL, OPT_BOOL },
 109         { "L2TP.NoVJ", "no-vj-comp", OPT_PPPD, NULL, OPT_BOOL },
 110 };
 111
 112 static DBusConnection *connection;
 113
 114 static DBusMessage *l2tp_get_sec(struct connman_task *task,
 115                         DBusMessage *msg, void *user_data)
 116 {
 117         const char *user, *passwd;
 118         struct vpn_provider *provider = user_data;
 119
 120         if (dbus_message_get_no_reply(msg) == FALSE) {
 121                 DBusMessage *reply;
 122
 123                 user = vpn_provider_get_string(provider, "L2TP.User");
 124                 passwd = vpn_provider_get_string(provider, "L2TP.Password");
 125
 126                 if (user == NULL || strlen(user) == 0 ||
 127                                 passwd == NULL || strlen(passwd) == 0)
 128                         return NULL;
 129
 130                 reply = dbus_message_new_method_return(msg);
 131                 if (reply == NULL)
 132                         return NULL;
 133
 134                 dbus_message_append_args(reply, DBUS_TYPE_STRING, &user,
 135                                                 DBUS_TYPE_STRING, &passwd,
 136                                                 DBUS_TYPE_INVALID);
 137
 138                 return reply;
 139         }
 140
 141         return NULL;
 142 }
 143
 144 static int l2tp_notify(DBusMessage *msg, struct vpn_provider *provider)
 145 {
 146         DBusMessageIter iter, dict;
 147         const char *reason, *key, *value;
 148         char *addressv4 = NULL, *netmask = NULL, *gateway = NULL;
 149         char *ifname = NULL, *nameservers = NULL;
 150         struct connman_ipaddress *ipaddress = NULL;
 151
 152         dbus_message_iter_init(msg, &iter);
 153
 154         dbus_message_iter_get_basic(&iter, &reason);
 155         dbus_message_iter_next(&iter);
 156
 157         if (!provider) {
 158                 connman_error("No provider found");
 159                 return VPN_STATE_FAILURE;
 160         }
 161
 162         if (strcmp(reason, "auth failed") == 0)
 163                 return VPN_STATE_AUTH_FAILURE;
 164
 165         if (strcmp(reason, "connect"))
 166                 return VPN_STATE_DISCONNECT;
 167
 168         dbus_message_iter_recurse(&iter, &dict);
 169
 170         while (dbus_message_iter_get_arg_type(&dict) == DBUS_TYPE_DICT_ENTRY) {
 171                 DBusMessageIter entry;
 172
 173                 dbus_message_iter_recurse(&dict, &entry);
 174                 dbus_message_iter_get_basic(&entry, &key);
 175                 dbus_message_iter_next(&entry);
 176                 dbus_message_iter_get_basic(&entry, &value);
 177
 178                 DBG("%s = %s", key, value);
 179
 180                 if (!strcmp(key, "INTERNAL_IP4_ADDRESS")) {
 181                         vpn_provider_set_string(provider, "Address", value);
 182                         addressv4 = g_strdup(value);
 183                 }
 184
 185                 if (!strcmp(key, "INTERNAL_IP4_NETMASK")) {
 186                         vpn_provider_set_string(provider, "Netmask", value);
 187                         netmask = g_strdup(value);
 188                 }
 189
 190                 if (!strcmp(key, "INTERNAL_IP4_DNS")) {
 191                         vpn_provider_set_string(provider, "DNS", value);
 192                         nameservers = g_strdup(value);
 193                 }
 194
 195                 if (!strcmp(key, "INTERNAL_IFNAME"))
 196                         ifname = g_strdup(value);
 197
 198                 dbus_message_iter_next(&dict);
 199         }
 200
 201         if (vpn_set_ifname(provider, ifname) < 0) {
 202                 g_free(ifname);
 203                 g_free(addressv4);
 204                 g_free(netmask);
 205                 g_free(nameservers);
 206                 return VPN_STATE_FAILURE;
 207         }
 208
 209         if (addressv4 != NULL)
 210                 ipaddress = connman_ipaddress_alloc(AF_INET);
 211
 212         g_free(ifname);
 213
 214         if (ipaddress == NULL) {
 215                 connman_error("No IP address for provider");
 216                 g_free(addressv4);
 217                 g_free(netmask);
 218                 g_free(nameservers);
 219                 return VPN_STATE_FAILURE;
 220         }
 221
 222         value = vpn_provider_get_string(provider, "HostIP");
 223         if (value != NULL) {
 224                 vpn_provider_set_string(provider, "Gateway", value);
 225                 gateway = g_strdup(value);
 226         }
 227
 228         if (addressv4 != NULL)
 229                 connman_ipaddress_set_ipv4(ipaddress, addressv4, netmask,
 230                                         gateway);
 231
 232         vpn_provider_set_ipaddress(provider, ipaddress);
 233         vpn_provider_set_nameservers(provider, nameservers);
 234
 235         g_free(addressv4);
 236         g_free(netmask);
 237         g_free(gateway);
 238         g_free(nameservers);
 239         connman_ipaddress_free(ipaddress);
 240
 241         return VPN_STATE_CONNECT;
 242 }
 243
 244 static int l2tp_save(struct vpn_provider *provider, GKeyFile *keyfile)
 245 {
 246         const char *option;
 247         int i;
 248
 249         for (i = 0; i < (int)ARRAY_SIZE(pppd_options); i++) {
 250                 if (strncmp(pppd_options[i].cm_opt, "L2TP.", 5) == 0) {
 251                         option = vpn_provider_get_string(provider,
 252                                                         pppd_options[i].cm_opt);
 253                         if (option == NULL)
 254                                 continue;
 255
 256                         g_key_file_set_string(keyfile,
 257                                         vpn_provider_get_save_group(provider),
 258                                         pppd_options[i].cm_opt, option);
 259                 }
 260         }
 261
 262         option = vpn_provider_get_string(provider, "L2TP.Password");
 263         if (option != NULL)
 264                 g_key_file_set_string(keyfile,
 265                                         vpn_provider_get_save_group(provider),
 266                                         "L2TP.Password", option);
 267
 268         return 0;
 269 }
 270
 271 static ssize_t full_write(int fd, const void *buf, size_t len)
 272 {
 273         ssize_t byte_write;
 274
 275         while (len) {
 276                 byte_write = write(fd, buf, len);
 277                 if (byte_write < 0) {
 278                         connman_error("failed to write config to l2tp: %s\n",
 279                                         strerror(errno));
 280                         return byte_write;
 281                 }
 282                 len -= byte_write;
 283                 buf += byte_write;
 284         }
 285
 286         return 0;
 287 }
 288
 289 static ssize_t l2tp_write_bool_option(int fd,
 290                                         const char *key, const char *value)
 291 {
 292         gchar *buf;
 293         ssize_t ret = 0;
 294
 295         if (key != NULL && value != NULL) {
 296                 if (strcasecmp(value, "yes") == 0 ||
 297                                 strcasecmp(value, "true") == 0 ||
 298                                 strcmp(value, "1") == 0) {
 299                         buf = g_strdup_printf("%s\n", key);
 300                         ret = full_write(fd, buf, strlen(buf));
 301
 302                         g_free(buf);
 303                 }
 304         }
 305
 306         return ret;
 307 }
 308
 309 static int l2tp_write_option(int fd, const char *key, const char *value)
 310 {
 311         gchar *buf;
 312         ssize_t ret = 0;
 313
 314         if (key != NULL) {
 315                 if (value != NULL)
 316                         buf = g_strdup_printf("%s %s\n", key, value);
 317                 else
 318                         buf = g_strdup_printf("%s\n", key);
 319
 320                 ret = full_write(fd, buf, strlen(buf));
 321
 322                 g_free(buf);
 323         }
 324
 325         return ret;
 326 }
 327
 328 static int l2tp_write_section(int fd, const char *key, const char *value)
 329 {
 330         gchar *buf;
 331         ssize_t ret = 0;
 332
 333         if (key != NULL && value != NULL) {
 334                 buf = g_strdup_printf("%s = %s\n", key, value);
 335                 ret = full_write(fd, buf, strlen(buf));
 336
 337                 g_free(buf);
 338         }
 339
 340         return ret;
 341 }
 342
 343 static int write_pppd_option(struct vpn_provider *provider, int fd)
 344 {
 345         int i;
 346         const char *opt_s;
 347
 348         l2tp_write_option(fd, "nodetach", NULL);
 349         l2tp_write_option(fd, "lock", NULL);
 350         l2tp_write_option(fd, "usepeerdns", NULL);
 351         l2tp_write_option(fd, "noipdefault", NULL);
 352         l2tp_write_option(fd, "noauth", NULL);
 353         l2tp_write_option(fd, "nodefaultroute", NULL);
 354         l2tp_write_option(fd, "ipparam", "l2tp_plugin");
 355
 356         for (i = 0; i < (int)ARRAY_SIZE(pppd_options); i++) {
 357                 if (pppd_options[i].sub != OPT_ALL &&
 358                         pppd_options[i].sub != OPT_PPPD)
 359                         continue;
 360
 361                 opt_s = vpn_provider_get_string(provider,
 362                                         pppd_options[i].cm_opt);
 363                 if (!opt_s)
 364                         opt_s = pppd_options[i].vpn_default;
 365
 366                 if (!opt_s)
 367                         continue;
 368
 369                 if (pppd_options[i].type == OPT_STRING)
 370                         l2tp_write_option(fd,
 371                                 pppd_options[i].pppd_opt, opt_s);
 372                 else if (pppd_options[i].type == OPT_BOOL)
 373                         l2tp_write_bool_option(fd,
 374                                 pppd_options[i].pppd_opt, opt_s);
 375         }
 376
 377         l2tp_write_option(fd, "plugin",
 378                                 SCRIPTDIR "/libppp-plugin.so");
 379
 380         return 0;
 381 }
 382
 383
 384 static int l2tp_write_fields(struct vpn_provider *provider,
 385                                                 int fd, int sub)
 386 {
 387         int i;
 388         const char *opt_s;
 389
 390         for (i = 0; i < (int)ARRAY_SIZE(pppd_options); i++) {
 391                 if (pppd_options[i].sub != sub)
 392                         continue;
 393
 394                 opt_s = vpn_provider_get_string(provider,
 395                                         pppd_options[i].cm_opt);
 396                 if (!opt_s)
 397                         opt_s = pppd_options[i].vpn_default;
 398
 399                 if (!opt_s)
 400                         continue;
 401
 402                 if (pppd_options[i].type == OPT_STRING)
 403                         l2tp_write_section(fd,
 404                                 pppd_options[i].pppd_opt, opt_s);
 405                 else if (pppd_options[i].type == OPT_BOOL)
 406                         l2tp_write_bool_option(fd,
 407                                 pppd_options[i].pppd_opt, opt_s);
 408         }
 409
 410         return 0;
 411 }
 412
 413 static int l2tp_write_config(struct vpn_provider *provider,
 414                                         const char *pppd_name, int fd)
 415 {
 416         const char *option;
 417
 418         l2tp_write_option(fd, "[global]", NULL);
 419         l2tp_write_fields(provider, fd, OPT_L2G);
 420
 421         l2tp_write_option(fd, "[lac l2tp]", NULL);
 422
 423         option = vpn_provider_get_string(provider, "Host");
 424         l2tp_write_option(fd, "lns =", option);
 425
 426         l2tp_write_fields(provider, fd, OPT_ALL);
 427         l2tp_write_fields(provider, fd, OPT_L2);
 428
 429         l2tp_write_option(fd, "pppoptfile =", pppd_name);
 430
 431         return 0;
 432 }
 433
 434 static void l2tp_died(struct connman_task *task, int exit_code, void *user_data)
 435 {
 436         char *conf_file;
 437
 438         vpn_died(task, exit_code, user_data);
 439
 440         conf_file = g_strdup_printf("/var/run/connman/connman-xl2tpd.conf");
 441         unlink(conf_file);
 442         g_free(conf_file);
 443
 444         conf_file = g_strdup_printf("/var/run/connman/connman-ppp-option.conf");
 445         unlink(conf_file);
 446         g_free(conf_file);
 447 }
 448
 449 static int l2tp_connect(struct vpn_provider *provider,
 450                 struct connman_task *task, const char *if_name)
 451 {
 452         const char *host;
 453         char *l2tp_name, *pppd_name;
 454         int l2tp_fd, pppd_fd;
 455         int err;
 456
 457         if (connman_task_set_notify(task, "getsec",
 458                                         l2tp_get_sec, provider))
 459                 return -ENOMEM;
 460
 461         host = vpn_provider_get_string(provider, "Host");
 462         if (host == NULL) {
 463                 connman_error("Host not set; cannot enable VPN");
 464                 return -EINVAL;
 465         }
 466
 467         l2tp_name = g_strdup_printf("/var/run/connman/connman-xl2tpd.conf");
 468
 469         l2tp_fd = open(l2tp_name, O_RDWR|O_CREAT|O_TRUNC, S_IRUSR|S_IWUSR);
 470         if (l2tp_fd < 0) {
 471                 g_free(l2tp_name);
 472                 connman_error("Error writing l2tp config");
 473                 return -EIO;
 474         }
 475
 476         pppd_name = g_strdup_printf("/var/run/connman/connman-ppp-option.conf");
 477
 478         pppd_fd = open(pppd_name, O_RDWR|O_CREAT|O_TRUNC, S_IRUSR|S_IWUSR);
 479         if (pppd_fd < 0) {
 480                 connman_error("Error writing pppd config");
 481                 g_free(l2tp_name);
 482                 g_free(pppd_name);
 483                 close(l2tp_fd);
 484                 return -EIO;
 485         }
 486
 487         l2tp_write_config(provider, pppd_name, l2tp_fd);
 488
 489         write_pppd_option(provider, pppd_fd);
 490
 491         connman_task_add_argument(task, "-D", NULL);
 492         connman_task_add_argument(task, "-c", l2tp_name);
 493
 494         g_free(l2tp_name);
 495         g_free(pppd_name);
 496
 497         err = connman_task_run(task, l2tp_died, provider,
 498                                 NULL, NULL, NULL);
 499         if (err < 0) {
 500                 connman_error("l2tp failed to start");
 501                 return -EIO;
 502         }
 503
 504         return 0;
 505 }
 506
 507 static int l2tp_error_code(int exit_code)
 508 {
 509         switch (exit_code) {
 510         case 1:
 511                 return CONNMAN_PROVIDER_ERROR_CONNECT_FAILED;
 512         default:
 513                 return CONNMAN_PROVIDER_ERROR_UNKNOWN;
 514         }
 515 }
 516
 517 static struct vpn_driver vpn_driver = {
 518         .flags          = VPN_FLAG_NO_TUN,
 519         .notify         = l2tp_notify,
 520         .connect        = l2tp_connect,
 521         .error_code     = l2tp_error_code,
 522         .save           = l2tp_save,
 523 };
 524
 525 static int l2tp_init(void)
 526 {
 527         connection = connman_dbus_get_connection();
 528
 529         return vpn_register("l2tp", &vpn_driver, L2TP);
 530 }
 531
 532 static void l2tp_exit(void)
 533 {
 534         vpn_unregister("l2tp");
 535
 536         dbus_connection_unref(connection);
 537 }
 538
 539 CONNMAN_PLUGIN_DEFINE(l2tp, "l2tp plugin", VERSION,
 540         CONNMAN_PLUGIN_PRIORITY_DEFAULT, l2tp_init, l2tp_exit)