plugins/l2tp.c

   1 /*
   2  *
   3  *  Connection Manager
   4  *
   5  *  Copyright (C) 2010  BMW Car IT GmbH. All rights reserved.
   6  *  Copyright (C) 2011  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 <glib.h>
  38
  39 #define CONNMAN_API_SUBJECT_TO_CHANGE
  40 #include <connman/plugin.h>
  41 #include <connman/provider.h>
  42 #include <connman/log.h>
  43 #include <connman/task.h>
  44 #include <connman/dbus.h>
  45 #include <connman/inet.h>
  46
  47 #include "vpn.h"
  48
  49 #define ARRAY_SIZE(a) (sizeof(a)/sizeof(a[0]))
  50
  51 enum {
  52         OPT_STRING = 1,
  53         OPT_BOOL = 2,
  54 };
  55
  56 enum {
  57         OPT_ALL = 1,
  58         OPT_L2G = 2,
  59         OPT_L2  = 3,
  60         OPT_PPPD = 4,
  61 };
  62
  63 struct {
  64         const char *cm_opt;
  65         const char *pppd_opt;
  66         int sub;
  67         const char *vpn_default;
  68         int type;
  69 } pppd_options[] = {
  70         { "L2TP.User", "name", OPT_ALL, NULL, OPT_STRING },
  71         { "L2TP.BPS", "bps", OPT_L2, NULL, OPT_STRING },
  72         { "L2TP.LengthBit", "length bit", OPT_L2, NULL, OPT_STRING },
  73         { "L2TP.Challenge", "challenge", OPT_L2, NULL, OPT_STRING },
  74         { "L2TP.DefaultRoute", "defaultroute", OPT_L2, NULL, OPT_STRING },
  75         { "L2TP.FlowBit", "flow bit", OPT_L2, NULL, OPT_STRING },
  76         { "L2TP.TunnelRWS", "tunnel rws", OPT_L2, NULL, OPT_STRING },
  77         { "L2TP.Exclusive", "exclusive", OPT_L2, NULL, OPT_STRING },
  78         { "L2TP.Autodial", "autodial", OPT_L2, "yes", OPT_STRING },
  79         { "L2TP.Redial", "redial", OPT_L2, "yes", OPT_STRING },
  80         { "L2TP.RedialTimeout", "redial timeout", OPT_L2, "10", OPT_STRING },
  81         { "L2TP.MaxRedials", "max redials", OPT_L2, NULL, OPT_STRING },
  82         { "L2TP.RequirePAP", "require pap", OPT_L2, "no", OPT_STRING },
  83         { "L2TP.RequireCHAP", "require chap", OPT_L2, "yes", OPT_STRING },
  84         { "L2TP.ReqAuth", "require authentication", OPT_L2, "no", OPT_STRING },
  85         { "L2TP.AccessControl", "access control", OPT_L2G, "yes", OPT_STRING },
  86         { "L2TP.AuthFile", "auth file", OPT_L2G, NULL, OPT_STRING },
  87         { "L2TP.ForceUserSpace", "force userspace", OPT_L2G, NULL, OPT_STRING },
  88         { "L2TP.ListenAddr", "listen-addr", OPT_L2G, NULL, OPT_STRING },
  89         { "L2TP.Rand Source", "rand source", OPT_L2G, NULL, OPT_STRING },
  90         { "L2TP.IPsecSaref", "ipsec saref", OPT_L2G, NULL, OPT_STRING },
  91         { "L2TP.Port", "port", OPT_L2G, NULL, OPT_STRING },
  92         { "L2TP.EchoFailure", "lcp-echo-failure", OPT_PPPD, "0", OPT_STRING },
  93         { "L2TP.EchoInterval", "lcp-echo-interval", OPT_PPPD, "0", OPT_STRING },
  94         { "L2TP.Debug", "debug", OPT_PPPD, NULL, OPT_STRING },
  95         { "L2TP.RefuseEAP", "refuse-eap", OPT_PPPD, NULL, OPT_BOOL },
  96         { "L2TP.RefusePAP", "refuse-pap", OPT_PPPD, NULL, OPT_BOOL },
  97         { "L2TP.RefuseCHAP", "refuse-chap", OPT_PPPD, NULL, OPT_BOOL },
  98         { "L2TP.RefuseMSCHAP", "refuse-mschap", OPT_PPPD, NULL, OPT_BOOL },
  99         { "L2TP.RefuseMSCHAP2", "refuse-mschapv2", OPT_PPPD, NULL, OPT_BOOL },
 100         { "L2TP.NoBSDComp", "nobsdcomp", OPT_PPPD, NULL, OPT_BOOL },
 101         { "L2TP.NoPcomp", "nopcomp", OPT_PPPD, NULL, OPT_BOOL },
 102         { "L2TP.UseAccomp", "accomp", OPT_PPPD, NULL, OPT_BOOL },
 103         { "L2TP.NoDeflate", "nodeflatey", OPT_PPPD, NULL, OPT_BOOL },
 104         { "L2TP.ReqMPPE", "require-mppe", OPT_PPPD, NULL, OPT_BOOL },
 105         { "L2TP.ReqMPPE40", "require-mppe-40", OPT_PPPD, NULL, OPT_BOOL },
 106         { "L2TP.ReqMPPE128", "require-mppe-128", OPT_PPPD, NULL, OPT_BOOL },
 107         { "L2TP.ReqMPPEStateful", "mppe-stateful", OPT_PPPD, NULL, OPT_BOOL },
 108         { "L2TP.NoVJ", "no-vj-comp", OPT_PPPD, NULL, OPT_BOOL },
 109 };
 110
 111 static DBusConnection *connection;
 112
 113 static DBusMessage *l2tp_get_sec(struct connman_task *task,
 114                         DBusMessage *msg, void *user_data)
 115 {
 116         const char *user, *passwd;
 117         struct connman_provider *provider = user_data;
 118
 119         if (dbus_message_get_no_reply(msg) == FALSE) {
 120                 DBusMessage *reply;
 121
 122                 user = connman_provider_get_string(provider, "L2TP.User");
 123                 passwd = connman_provider_get_string(provider, "L2TP.Password");
 124
 125                 if (user == NULL || strlen(user) == 0 ||
 126                                 passwd == NULL || strlen(passwd) == 0)
 127                         return NULL;
 128
 129                 reply = dbus_message_new_method_return(msg);
 130                 if (reply == NULL)
 131                         return NULL;
 132
 133                 dbus_message_append_args(reply, DBUS_TYPE_STRING, &user,
 134                                                 DBUS_TYPE_STRING, &passwd,
 135                                                 DBUS_TYPE_INVALID);
 136
 137                 return reply;
 138         }
 139
 140         return NULL;
 141 }
 142
 143 static int l2tp_notify(DBusMessage *msg, struct connman_provider *provider)
 144 {
 145         DBusMessageIter iter, dict;
 146         const char *reason, *key, *value;
 147         char *addressv4 = NULL, *netmask = NULL, *gateway = NULL;
 148         char *ifname = NULL, *nameservers = NULL;
 149         struct connman_ipaddress *ipaddress = NULL;
 150
 151         dbus_message_iter_init(msg, &iter);
 152
 153         dbus_message_iter_get_basic(&iter, &reason);
 154         dbus_message_iter_next(&iter);
 155
 156         if (!provider) {
 157                 connman_error("No provider found");
 158                 return VPN_STATE_FAILURE;
 159         }
 160
 161         if (strcmp(reason, "connect"))
 162                 return VPN_STATE_DISCONNECT;
 163
 164         dbus_message_iter_recurse(&iter, &dict);
 165
 166         while (dbus_message_iter_get_arg_type(&dict) == DBUS_TYPE_DICT_ENTRY) {
 167                 DBusMessageIter entry;
 168
 169                 dbus_message_iter_recurse(&dict, &entry);
 170                 dbus_message_iter_get_basic(&entry, &key);
 171                 dbus_message_iter_next(&entry);
 172                 dbus_message_iter_get_basic(&entry, &value);
 173
 174                 DBG("%s = %s", key, value);
 175
 176                 if (!strcmp(key, "INTERNAL_IP4_ADDRESS")) {
 177                         connman_provider_set_string(provider, "Address", value);
 178                         addressv4 = g_strdup(value);
 179                 }
 180
 181                 if (!strcmp(key, "INTERNAL_IP4_NETMASK")) {
 182                         connman_provider_set_string(provider, "Netmask", value);
 183                         netmask = g_strdup(value);
 184                 }
 185
 186                 if (!strcmp(key, "INTERNAL_IP4_DNS")) {
 187                         connman_provider_set_string(provider, "DNS", value);
 188                         nameservers = g_strdup(value);
 189                 }
 190
 191                 if (!strcmp(key, "INTERNAL_IFNAME"))
 192                         ifname = g_strdup(value);
 193
 194                 dbus_message_iter_next(&dict);
 195         }
 196
 197         if (vpn_set_ifname(provider, ifname) < 0) {
 198                 g_free(ifname);
 199                 g_free(addressv4);
 200                 g_free(netmask);
 201                 g_free(nameservers);
 202                 return VPN_STATE_FAILURE;
 203         }
 204
 205         if (addressv4 != NULL)
 206                 ipaddress = connman_ipaddress_alloc(AF_INET);
 207
 208         g_free(ifname);
 209
 210         if (ipaddress == NULL) {
 211                 connman_error("No IP address for provider");
 212                 g_free(addressv4);
 213                 g_free(netmask);
 214                 g_free(nameservers);
 215                 return VPN_STATE_FAILURE;
 216         }
 217
 218         value = connman_provider_get_string(provider, "Host");
 219         if (value != NULL) {
 220                 connman_provider_set_string(provider, "Gateway", value);
 221                 gateway = g_strdup(value);
 222         }
 223
 224         if (addressv4 != NULL)
 225                 connman_ipaddress_set_ipv4(ipaddress, addressv4, netmask,
 226                                         gateway);
 227
 228         connman_provider_set_ipaddress(provider, ipaddress);
 229         connman_provider_set_nameservers(provider, nameservers);
 230
 231         g_free(addressv4);
 232         g_free(netmask);
 233         g_free(gateway);
 234         g_free(nameservers);
 235         connman_ipaddress_free(ipaddress);
 236
 237         return VPN_STATE_CONNECT;
 238 }
 239
 240 static ssize_t full_write(int fd, const void *buf, size_t len)
 241 {
 242         ssize_t byte_write;
 243
 244         while (len) {
 245                 byte_write = write(fd, buf, len);
 246                 if (byte_write < 0) {
 247                         connman_error("failed to write config to l2tp: %s\n",
 248                                         strerror(errno));
 249                         return byte_write;
 250                 }
 251                 len -= byte_write;
 252                 buf += byte_write;
 253         }
 254
 255         return 0;
 256 }
 257
 258 static ssize_t l2tp_write_bool_option(int fd,
 259                                         const char *key, const char *value)
 260 {
 261         gchar *buf;
 262         ssize_t ret = 0;
 263
 264         if (key != NULL && value != NULL) {
 265                 if (strcmp(value, "yes") == 0) {
 266                         buf = g_strdup_printf("%s\n", key);
 267                         ret = full_write(fd, buf, strlen(buf));
 268
 269                         g_free(buf);
 270                 }
 271         }
 272
 273         return ret;
 274 }
 275
 276 static int l2tp_write_option(int fd, const char *key, const char *value)
 277 {
 278         gchar *buf;
 279         ssize_t ret = 0;
 280
 281         if (key != NULL) {
 282                 if (value != NULL)
 283                         buf = g_strdup_printf("%s %s\n", key, value);
 284                 else
 285                         buf = g_strdup_printf("%s\n", key);
 286
 287                 ret = full_write(fd, buf, strlen(buf));
 288
 289                 g_free(buf);
 290         }
 291
 292         return ret;
 293 }
 294
 295 static int l2tp_write_section(int fd, const char *key, const char *value)
 296 {
 297         gchar *buf;
 298         ssize_t ret = 0;
 299
 300         if (key != NULL && value != NULL) {
 301                 buf = g_strdup_printf("%s = %s\n", key, value);
 302                 ret = full_write(fd, buf, strlen(buf));
 303
 304                 g_free(buf);
 305         }
 306
 307         return ret;
 308 }
 309
 310 static int write_pppd_option(struct connman_provider *provider, int fd)
 311 {
 312         int i;
 313         const char *opt_s;
 314
 315         l2tp_write_option(fd, "nodetach", NULL);
 316         l2tp_write_option(fd, "lock", NULL);
 317         l2tp_write_option(fd, "usepeerdns", NULL);
 318         l2tp_write_option(fd, "noipdefault", NULL);
 319         l2tp_write_option(fd, "noauth", NULL);
 320         l2tp_write_option(fd, "nodefaultroute", NULL);
 321         l2tp_write_option(fd, "ipparam", "l2tp_plugin");
 322
 323         for (i = 0; i < (int)ARRAY_SIZE(pppd_options); i++) {
 324                 if (pppd_options[i].sub != OPT_ALL &&
 325                         pppd_options[i].sub != OPT_PPPD)
 326                         continue;
 327
 328                 opt_s = connman_provider_get_string(provider,
 329                                         pppd_options[i].cm_opt);
 330                 if (!opt_s)
 331                         opt_s = pppd_options[i].vpn_default;
 332
 333                 if (!opt_s)
 334                         continue;
 335
 336                 if (pppd_options[i].type == OPT_STRING)
 337                         l2tp_write_option(fd,
 338                                 pppd_options[i].pppd_opt, opt_s);
 339                 else if (pppd_options[i].type == OPT_BOOL)
 340                         l2tp_write_bool_option(fd,
 341                                 pppd_options[i].pppd_opt, opt_s);
 342         }
 343
 344         l2tp_write_option(fd, "plugin",
 345                                 SCRIPTDIR "/libppp-plugin.so");
 346
 347         return 0;
 348 }
 349
 350
 351 static int l2tp_write_fields(struct connman_provider *provider,
 352                                                 int fd, int sub)
 353 {
 354         int i;
 355         const char *opt_s;
 356
 357         for (i = 0; i < (int)ARRAY_SIZE(pppd_options); i++) {
 358                 if (pppd_options[i].sub != sub)
 359                         continue;
 360
 361                 opt_s = connman_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_section(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         return 0;
 378 }
 379
 380 static int l2tp_write_config(struct connman_provider *provider,
 381                                         const char *pppd_name, int fd)
 382 {
 383         const char *option;
 384
 385         l2tp_write_option(fd, "[global]", NULL);
 386         l2tp_write_fields(provider, fd, OPT_L2G);
 387
 388         l2tp_write_option(fd, "[lac l2tp]", NULL);
 389
 390         option = connman_provider_get_string(provider, "Host");
 391         l2tp_write_option(fd, "lns =", option);
 392
 393         l2tp_write_fields(provider, fd, OPT_ALL);
 394         l2tp_write_fields(provider, fd, OPT_L2);
 395
 396         l2tp_write_option(fd, "pppoptfile =", pppd_name);
 397
 398         return 0;
 399 }
 400
 401 static void l2tp_died(struct connman_task *task, int exit_code, void *user_data)
 402 {
 403         char *conf_file;
 404
 405         vpn_died(task, exit_code, user_data);
 406
 407         conf_file = g_strdup_printf("/var/run/connman/connman-xl2tpd.conf");
 408         unlink(conf_file);
 409         g_free(conf_file);
 410
 411         conf_file = g_strdup_printf("/var/run/connman/connman-ppp-option.conf");
 412         unlink(conf_file);
 413         g_free(conf_file);
 414 }
 415
 416 static int l2tp_connect(struct connman_provider *provider,
 417                 struct connman_task *task, const char *if_name)
 418 {
 419         const char *host;
 420         char *l2tp_name, *pppd_name;
 421         int l2tp_fd, pppd_fd;
 422         int err;
 423
 424         if (connman_task_set_notify(task, "getsec",
 425                                         l2tp_get_sec, provider))
 426                 return -ENOMEM;
 427
 428         host = connman_provider_get_string(provider, "Host");
 429         if (host == NULL) {
 430                 connman_error("Host not set; cannot enable VPN");
 431                 return -EINVAL;
 432         }
 433
 434         l2tp_name = g_strdup_printf("/var/run/connman/connman-xl2tpd.conf");
 435
 436         l2tp_fd = open(l2tp_name, O_RDWR|O_CREAT|O_TRUNC, S_IRUSR|S_IWUSR);
 437         if (l2tp_fd < 0) {
 438                 g_free(l2tp_name);
 439                 connman_error("Error writing l2tp config");
 440                 return -EIO;
 441         }
 442
 443         pppd_name = g_strdup_printf("/var/run/connman/connman-ppp-option.conf");
 444
 445         pppd_fd = open(pppd_name, O_RDWR|O_CREAT|O_TRUNC, S_IRUSR|S_IWUSR);
 446         if (pppd_fd < 0) {
 447                 connman_error("Error writing pppd config");
 448                 g_free(l2tp_name);
 449                 g_free(pppd_name);
 450                 close(l2tp_fd);
 451                 return -EIO;
 452         }
 453
 454         l2tp_write_config(provider, pppd_name, l2tp_fd);
 455
 456         write_pppd_option(provider, pppd_fd);
 457
 458         connman_task_add_argument(task, "-D", NULL);
 459         connman_task_add_argument(task, "-c", l2tp_name);
 460
 461         g_free(l2tp_name);
 462         g_free(pppd_name);
 463
 464         err = connman_task_run(task, l2tp_died, provider,
 465                                 NULL, NULL, NULL);
 466         if (err < 0) {
 467                 connman_error("l2tp failed to start");
 468                 return -EIO;
 469         }
 470
 471         return 0;
 472 }
 473
 474 static int l2tp_error_code(int exit_code)
 475 {
 476
 477         switch (exit_code) {
 478         case 1:
 479                 return CONNMAN_PROVIDER_ERROR_CONNECT_FAILED;
 480         case 2:
 481                 return CONNMAN_PROVIDER_ERROR_LOGIN_FAILED;
 482         default:
 483                 return CONNMAN_PROVIDER_ERROR_UNKNOWN;
 484         }
 485 }
 486
 487 static struct vpn_driver vpn_driver = {
 488         .flags          = VPN_FLAG_NO_TUN,
 489         .notify         = l2tp_notify,
 490         .connect        = l2tp_connect,
 491         .error_code     = l2tp_error_code,
 492 };
 493
 494 static int l2tp_init(void)
 495 {
 496         connection = connman_dbus_get_connection();
 497
 498         return vpn_register("l2tp", &vpn_driver, L2TP);
 499 }
 500
 501 static void l2tp_exit(void)
 502 {
 503         vpn_unregister("l2tp");
 504
 505         dbus_connection_unref(connection);
 506 }
 507
 508 CONNMAN_PLUGIN_DEFINE(l2tp, "l2tp plugin", VERSION,
 509         CONNMAN_PLUGIN_PRIORITY_DEFAULT, l2tp_init, l2tp_exit)