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, "auth failed") == 0)
 162                 return VPN_STATE_AUTH_FAILURE;
 163
 164         if (strcmp(reason, "connect"))
 165                 return VPN_STATE_DISCONNECT;
 166
 167         dbus_message_iter_recurse(&iter, &dict);
 168
 169         while (dbus_message_iter_get_arg_type(&dict) == DBUS_TYPE_DICT_ENTRY) {
 170                 DBusMessageIter entry;
 171
 172                 dbus_message_iter_recurse(&dict, &entry);
 173                 dbus_message_iter_get_basic(&entry, &key);
 174                 dbus_message_iter_next(&entry);
 175                 dbus_message_iter_get_basic(&entry, &value);
 176
 177                 DBG("%s = %s", key, value);
 178
 179                 if (!strcmp(key, "INTERNAL_IP4_ADDRESS")) {
 180                         connman_provider_set_string(provider, "Address", value);
 181                         addressv4 = g_strdup(value);
 182                 }
 183
 184                 if (!strcmp(key, "INTERNAL_IP4_NETMASK")) {
 185                         connman_provider_set_string(provider, "Netmask", value);
 186                         netmask = g_strdup(value);
 187                 }
 188
 189                 if (!strcmp(key, "INTERNAL_IP4_DNS")) {
 190                         connman_provider_set_string(provider, "DNS", value);
 191                         nameservers = g_strdup(value);
 192                 }
 193
 194                 if (!strcmp(key, "INTERNAL_IFNAME"))
 195                         ifname = g_strdup(value);
 196
 197                 dbus_message_iter_next(&dict);
 198         }
 199
 200         if (vpn_set_ifname(provider, ifname) < 0) {
 201                 g_free(ifname);
 202                 g_free(addressv4);
 203                 g_free(netmask);
 204                 g_free(nameservers);
 205                 return VPN_STATE_FAILURE;
 206         }
 207
 208         if (addressv4 != NULL)
 209                 ipaddress = connman_ipaddress_alloc(AF_INET);
 210
 211         g_free(ifname);
 212
 213         if (ipaddress == NULL) {
 214                 connman_error("No IP address for provider");
 215                 g_free(addressv4);
 216                 g_free(netmask);
 217                 g_free(nameservers);
 218                 return VPN_STATE_FAILURE;
 219         }
 220
 221         value = connman_provider_get_string(provider, "Host");
 222         if (value != NULL) {
 223                 connman_provider_set_string(provider, "Gateway", value);
 224                 gateway = g_strdup(value);
 225         }
 226
 227         if (addressv4 != NULL)
 228                 connman_ipaddress_set_ipv4(ipaddress, addressv4, netmask,
 229                                         gateway);
 230
 231         connman_provider_set_ipaddress(provider, ipaddress);
 232         connman_provider_set_nameservers(provider, nameservers);
 233
 234         g_free(addressv4);
 235         g_free(netmask);
 236         g_free(gateway);
 237         g_free(nameservers);
 238         connman_ipaddress_free(ipaddress);
 239
 240         return VPN_STATE_CONNECT;
 241 }
 242
 243 static ssize_t full_write(int fd, const void *buf, size_t len)
 244 {
 245         ssize_t byte_write;
 246
 247         while (len) {
 248                 byte_write = write(fd, buf, len);
 249                 if (byte_write < 0) {
 250                         connman_error("failed to write config to l2tp: %s\n",
 251                                         strerror(errno));
 252                         return byte_write;
 253                 }
 254                 len -= byte_write;
 255                 buf += byte_write;
 256         }
 257
 258         return 0;
 259 }
 260
 261 static ssize_t l2tp_write_bool_option(int fd,
 262                                         const char *key, const char *value)
 263 {
 264         gchar *buf;
 265         ssize_t ret = 0;
 266
 267         if (key != NULL && value != NULL) {
 268                 if (strcmp(value, "yes") == 0) {
 269                         buf = g_strdup_printf("%s\n", key);
 270                         ret = full_write(fd, buf, strlen(buf));
 271
 272                         g_free(buf);
 273                 }
 274         }
 275
 276         return ret;
 277 }
 278
 279 static int l2tp_write_option(int fd, const char *key, const char *value)
 280 {
 281         gchar *buf;
 282         ssize_t ret = 0;
 283
 284         if (key != NULL) {
 285                 if (value != NULL)
 286                         buf = g_strdup_printf("%s %s\n", key, value);
 287                 else
 288                         buf = g_strdup_printf("%s\n", key);
 289
 290                 ret = full_write(fd, buf, strlen(buf));
 291
 292                 g_free(buf);
 293         }
 294
 295         return ret;
 296 }
 297
 298 static int l2tp_write_section(int fd, const char *key, const char *value)
 299 {
 300         gchar *buf;
 301         ssize_t ret = 0;
 302
 303         if (key != NULL && value != NULL) {
 304                 buf = g_strdup_printf("%s = %s\n", key, value);
 305                 ret = full_write(fd, buf, strlen(buf));
 306
 307                 g_free(buf);
 308         }
 309
 310         return ret;
 311 }
 312
 313 static int write_pppd_option(struct connman_provider *provider, int fd)
 314 {
 315         int i;
 316         const char *opt_s;
 317
 318         l2tp_write_option(fd, "nodetach", NULL);
 319         l2tp_write_option(fd, "lock", NULL);
 320         l2tp_write_option(fd, "usepeerdns", NULL);
 321         l2tp_write_option(fd, "noipdefault", NULL);
 322         l2tp_write_option(fd, "noauth", NULL);
 323         l2tp_write_option(fd, "nodefaultroute", NULL);
 324         l2tp_write_option(fd, "ipparam", "l2tp_plugin");
 325
 326         for (i = 0; i < (int)ARRAY_SIZE(pppd_options); i++) {
 327                 if (pppd_options[i].sub != OPT_ALL &&
 328                         pppd_options[i].sub != OPT_PPPD)
 329                         continue;
 330
 331                 opt_s = connman_provider_get_string(provider,
 332                                         pppd_options[i].cm_opt);
 333                 if (!opt_s)
 334                         opt_s = pppd_options[i].vpn_default;
 335
 336                 if (!opt_s)
 337                         continue;
 338
 339                 if (pppd_options[i].type == OPT_STRING)
 340                         l2tp_write_option(fd,
 341                                 pppd_options[i].pppd_opt, opt_s);
 342                 else if (pppd_options[i].type == OPT_BOOL)
 343                         l2tp_write_bool_option(fd,
 344                                 pppd_options[i].pppd_opt, opt_s);
 345         }
 346
 347         l2tp_write_option(fd, "plugin",
 348                                 SCRIPTDIR "/libppp-plugin.so");
 349
 350         return 0;
 351 }
 352
 353
 354 static int l2tp_write_fields(struct connman_provider *provider,
 355                                                 int fd, int sub)
 356 {
 357         int i;
 358         const char *opt_s;
 359
 360         for (i = 0; i < (int)ARRAY_SIZE(pppd_options); i++) {
 361                 if (pppd_options[i].sub != sub)
 362                         continue;
 363
 364                 opt_s = connman_provider_get_string(provider,
 365                                         pppd_options[i].cm_opt);
 366                 if (!opt_s)
 367                         opt_s = pppd_options[i].vpn_default;
 368
 369                 if (!opt_s)
 370                         continue;
 371
 372                 if (pppd_options[i].type == OPT_STRING)
 373                         l2tp_write_section(fd,
 374                                 pppd_options[i].pppd_opt, opt_s);
 375                 else if (pppd_options[i].type == OPT_BOOL)
 376                         l2tp_write_bool_option(fd,
 377                                 pppd_options[i].pppd_opt, opt_s);
 378         }
 379
 380         return 0;
 381 }
 382
 383 static int l2tp_write_config(struct connman_provider *provider,
 384                                         const char *pppd_name, int fd)
 385 {
 386         const char *option;
 387
 388         l2tp_write_option(fd, "[global]", NULL);
 389         l2tp_write_fields(provider, fd, OPT_L2G);
 390
 391         l2tp_write_option(fd, "[lac l2tp]", NULL);
 392
 393         option = connman_provider_get_string(provider, "Host");
 394         l2tp_write_option(fd, "lns =", option);
 395
 396         l2tp_write_fields(provider, fd, OPT_ALL);
 397         l2tp_write_fields(provider, fd, OPT_L2);
 398
 399         l2tp_write_option(fd, "pppoptfile =", pppd_name);
 400
 401         return 0;
 402 }
 403
 404 static void l2tp_died(struct connman_task *task, int exit_code, void *user_data)
 405 {
 406         char *conf_file;
 407
 408         vpn_died(task, exit_code, user_data);
 409
 410         conf_file = g_strdup_printf("/var/run/connman/connman-xl2tpd.conf");
 411         unlink(conf_file);
 412         g_free(conf_file);
 413
 414         conf_file = g_strdup_printf("/var/run/connman/connman-ppp-option.conf");
 415         unlink(conf_file);
 416         g_free(conf_file);
 417 }
 418
 419 static int l2tp_connect(struct connman_provider *provider,
 420                 struct connman_task *task, const char *if_name)
 421 {
 422         const char *host;
 423         char *l2tp_name, *pppd_name;
 424         int l2tp_fd, pppd_fd;
 425         int err;
 426
 427         if (connman_task_set_notify(task, "getsec",
 428                                         l2tp_get_sec, provider))
 429                 return -ENOMEM;
 430
 431         host = connman_provider_get_string(provider, "Host");
 432         if (host == NULL) {
 433                 connman_error("Host not set; cannot enable VPN");
 434                 return -EINVAL;
 435         }
 436
 437         l2tp_name = g_strdup_printf("/var/run/connman/connman-xl2tpd.conf");
 438
 439         l2tp_fd = open(l2tp_name, O_RDWR|O_CREAT|O_TRUNC, S_IRUSR|S_IWUSR);
 440         if (l2tp_fd < 0) {
 441                 g_free(l2tp_name);
 442                 connman_error("Error writing l2tp config");
 443                 return -EIO;
 444         }
 445
 446         pppd_name = g_strdup_printf("/var/run/connman/connman-ppp-option.conf");
 447
 448         pppd_fd = open(pppd_name, O_RDWR|O_CREAT|O_TRUNC, S_IRUSR|S_IWUSR);
 449         if (pppd_fd < 0) {
 450                 connman_error("Error writing pppd config");
 451                 g_free(l2tp_name);
 452                 g_free(pppd_name);
 453                 close(l2tp_fd);
 454                 return -EIO;
 455         }
 456
 457         l2tp_write_config(provider, pppd_name, l2tp_fd);
 458
 459         write_pppd_option(provider, pppd_fd);
 460
 461         connman_task_add_argument(task, "-D", NULL);
 462         connman_task_add_argument(task, "-c", l2tp_name);
 463
 464         g_free(l2tp_name);
 465         g_free(pppd_name);
 466
 467         err = connman_task_run(task, l2tp_died, provider,
 468                                 NULL, NULL, NULL);
 469         if (err < 0) {
 470                 connman_error("l2tp failed to start");
 471                 return -EIO;
 472         }
 473
 474         return 0;
 475 }
 476
 477 static int l2tp_error_code(int exit_code)
 478 {
 479         switch (exit_code) {
 480         case 1:
 481                 return CONNMAN_PROVIDER_ERROR_CONNECT_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)