src/charon/daemon.c

   1 /**
   2  * @file daemon.c
   3  *
   4  * @brief Implementation of daemon_t and main of IKEv2-Daemon.
   5  *
   6  */
   7
   8 /*
   9  * Copyright (C) 2006 Tobias Brunner, Daniel Roethlisberger
  10  * Copyright (C) 2005-2006 Martin Willi
  11  * Copyright (C) 2005 Jan Hutter
  12  * Hochschule fuer Technik Rapperswil
  13  *
  14  * This program is free software; you can redistribute it and/or modify it
  15  * under the terms of the GNU General Public License as published by the
  16  * Free Software Foundation; either version 2 of the License, or (at your
  17  * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
  18  *
  19  * This program is distributed in the hope that it will be useful, but
  20  * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  21  * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  22  * for more details.
  23  */
  24
  25 #include <stdio.h>
  26 #include <linux/capability.h>
  27 #include <sys/prctl.h>
  28 #include <signal.h>
  29 #include <pthread.h>
  30 #include <sys/stat.h>
  31 #include <sys/types.h>
  32 #include <unistd.h>
  33 #include <time.h>
  34 #include <string.h>
  35 #include <getopt.h>
  36 #include <errno.h>
  37 #ifdef HAVE_BACKTRACE
  38 # include <execinfo.h>
  39 #endif /* HAVE_BACKTRACE */
  40
  41 #include "daemon.h"
  42
  43 #include <library.h>
  44 #include <crypto/ca.h>
  45 #include <utils/fetcher.h>
  46 #include <config/credentials/local_credential_store.h>
  47 #include <config/backends/local_backend.h>
  48 #include <sa/authenticators/eap/eap_method.h>
  49
  50 /* on some distros, a capset definition is missing */
  51 #ifdef NO_CAPSET_DEFINED
  52 extern int capset(cap_user_header_t hdrp, const cap_user_data_t datap);
  53 #endif /* NO_CAPSET_DEFINED */
  54
  55 typedef struct private_daemon_t private_daemon_t;
  56
  57 /**
  58  * Private additions to daemon_t, contains threads and internal functions.
  59  */
  60 struct private_daemon_t {
  61         /**
  62          * Public members of daemon_t.
  63          */
  64         daemon_t public;
  65
  66         /**
  67          * Signal set used for signal handling.
  68          */
  69         sigset_t signal_set;
  70
  71         /**
  72          * The thread_id of main-thread.
  73          */
  74         pthread_t main_thread_id;
  75 };
  76
  77 /**
  78  * One and only instance of the daemon.
  79  */
  80 daemon_t *charon;
  81
  82 /**
  83  * hook in library for debugging messages
  84  */
  85 extern void (*dbg) (int level, char *fmt, ...);
  86
  87 /**
  88  * Logging hook for library logs, spreads debug message over bus
  89  */
  90 static void dbg_bus(int level, char *fmt, ...)
  91 {
  92         va_list args;
  93
  94         va_start(args, fmt);
  95         charon->bus->vsignal(charon->bus, DBG_LIB, level, fmt, args);
  96         va_end(args);
  97 }
  98
  99 /**
 100  * Logging hook for library logs, using stderr output
 101  */
 102 static void dbg_stderr(int level, char *fmt, ...)
 103 {
 104         va_list args;
 105
 106         va_start(args, fmt);
 107         fprintf(stderr, "00[LIB] ");
 108         vfprintf(stderr, fmt, args);
 109         fprintf(stderr, "\n");
 110         va_end(args);
 111 }
 112
 113 /**
 114  * Run the daemon and handle unix signals
 115  */
 116 static void run(private_daemon_t *this)
 117 {
 118         sigset_t set;
 119
 120         /* handle SIGINT, SIGHUP ans SIGTERM in this handler */
 121         sigemptyset(&set);
 122         sigaddset(&set, SIGINT);
 123         sigaddset(&set, SIGHUP);
 124         sigaddset(&set, SIGTERM);
 125
 126         while (TRUE)
 127         {
 128                 int sig;
 129                 int error;
 130
 131                 error = sigwait(&set, &sig);
 132                 if (error)
 133                 {
 134                         DBG1(DBG_DMN, "error %d while waiting for a signal", error);
 135                         return;
 136                 }
 137                 switch (sig)
 138                 {
 139                         case SIGHUP:
 140                         {
 141                                 DBG1(DBG_DMN, "signal of type SIGHUP received. Ignored");
 142                                 break;
 143                         }
 144                         case SIGINT:
 145                         {
 146                                 DBG1(DBG_DMN, "signal of type SIGINT received. Shutting down");
 147                                 return;
 148                         }
 149                         case SIGTERM:
 150                         {
 151                                 DBG1(DBG_DMN, "signal of type SIGTERM received. Shutting down");
 152                                 return;
 153                         }
 154                         default:
 155                         {
 156                                 DBG1(DBG_DMN, "unknown signal %d received. Ignored", sig);
 157                                 break;
 158                         }
 159                 }
 160         }
 161 }
 162
 163 /**
 164  * Clean up all daemon resources
 165  */
 166 static void destroy(private_daemon_t *this)
 167 {
 168         /* terminate all idle threads */
 169         this->public.processor->set_threads(this->public.processor, 0);
 170         /* close all IKE_SAs */
 171         DESTROY_IF(this->public.ike_sa_manager);
 172         DESTROY_IF(this->public.scheduler);
 173         DESTROY_IF(this->public.interfaces);
 174         DESTROY_IF(this->public.backends);
 175         DESTROY_IF(this->public.credentials);
 176         DESTROY_IF(this->public.kernel_interface);
 177         DESTROY_IF(this->public.sender);
 178         DESTROY_IF(this->public.receiver);
 179         DESTROY_IF(this->public.socket);
 180         /* wait until all threads are gone */
 181         DESTROY_IF(this->public.processor);
 182
 183         /* rehook library logging, shutdown logging */
 184         dbg = dbg_stderr;
 185         DESTROY_IF(this->public.bus);
 186         DESTROY_IF(this->public.outlog);
 187         DESTROY_IF(this->public.syslog);
 188         DESTROY_IF(this->public.authlog);
 189         free(this);
 190 }
 191
 192 /**
 193  * Enforce daemon shutdown, with a given reason to do so.
 194  */
 195 static void kill_daemon(private_daemon_t *this, char *reason)
 196 {
 197         /* we send SIGTERM, so the daemon can cleanly shut down */
 198         DBG1(DBG_DMN, "killing daemon: %s", reason);
 199         if (this->main_thread_id == pthread_self())
 200         {
 201                 /* initialization failed, terminate daemon */
 202                 destroy(this);
 203                 unlink(PID_FILE);
 204                 exit(-1);
 205         }
 206         else
 207         {
 208                 DBG1(DBG_DMN, "sending SIGTERM to ourself");
 209                 raise(SIGTERM);
 210                 /* thread must die, since he produced a ciritcal failure and can't continue */
 211                 pthread_exit(NULL);
 212         }
 213 }
 214
 215 /**
 216  * drop daemon capabilities
 217  */
 218 static void drop_capabilities(private_daemon_t *this, bool full)
 219 {
 220         struct __user_cap_header_struct hdr;
 221         struct __user_cap_data_struct data;
 222
 223         /* CAP_NET_ADMIN is needed to use netlink */
 224         u_int32_t keep = (1<<CAP_NET_ADMIN);
 225
 226         if (full)
 227         {
 228 #               if IPSEC_GID
 229                         setgid(IPSEC_GID);
 230 #               endif
 231 #               if IPSEC_UID
 232                         setuid(IPSEC_UID);
 233 #               endif
 234         }
 235         else
 236         {
 237                 /* CAP_NET_BIND_SERVICE to bind services below port 1024 */
 238                 keep |= (1<<CAP_NET_BIND_SERVICE);
 239                 /* CAP_NET_RAW to create RAW sockets */
 240                 keep |= (1<<CAP_NET_RAW);
 241                 /* CAP_DAC_READ_SEARCH to read ipsec.secrets */
 242                 keep |= (1<<CAP_DAC_READ_SEARCH);
 243         }
 244
 245         hdr.version = _LINUX_CAPABILITY_VERSION;
 246         hdr.pid = 0;
 247         data.effective = data.permitted = keep;
 248         data.inheritable = 0;
 249
 250         if (capset(&hdr, &data))
 251         {
 252                 kill_daemon(this, "unable to drop daemon capabilities");
 253         }
 254 }
 255
 256 /**
 257  * Initialize the daemon, optional with a strict crl policy
 258  */
 259 static void initialize(private_daemon_t *this, bool syslog, level_t levels[])
 260 {
 261         signal_t signal;
 262
 263         /* for uncritical pseudo random numbers */
 264         srandom(time(NULL) + getpid());
 265
 266         /* setup bus and it's listeners first to enable log output */
 267         this->public.bus = bus_create();
 268         this->public.outlog = file_logger_create(stdout);
 269         this->public.syslog = sys_logger_create(LOG_DAEMON);
 270         this->public.authlog = sys_logger_create(LOG_AUTHPRIV);
 271         this->public.bus->add_listener(this->public.bus, &this->public.syslog->listener);
 272         this->public.bus->add_listener(this->public.bus, &this->public.outlog->listener);
 273         this->public.bus->add_listener(this->public.bus, &this->public.authlog->listener);
 274         this->public.authlog->set_level(this->public.authlog, SIG_ANY, LEVEL_AUDIT);
 275         /* set up hook to log dbg message in library via charons message bus */
 276         dbg = dbg_bus;
 277
 278         /* apply loglevels */
 279         for (signal = 0; signal < DBG_MAX; signal++)
 280         {
 281                 this->public.syslog->set_level(this->public.syslog,
 282                                                                            signal, levels[signal]);
 283                 if (!syslog)
 284                 {
 285                         this->public.outlog->set_level(this->public.outlog,
 286                                                                                    signal, levels[signal]);
 287                 }
 288         }
 289
 290         DBG1(DBG_DMN, "starting charon (strongSwan Version %s)", VERSION);
 291
 292         this->public.ike_sa_manager = ike_sa_manager_create();
 293         this->public.processor = processor_create();
 294         this->public.scheduler = scheduler_create();
 295
 296         /* load secrets, ca certificates and crls */
 297         this->public.credentials = (credential_store_t*)local_credential_store_create();
 298         this->public.credentials->load_ca_certificates(this->public.credentials);
 299         this->public.credentials->load_aa_certificates(this->public.credentials);
 300         this->public.credentials->load_attr_certificates(this->public.credentials);
 301         this->public.credentials->load_ocsp_certificates(this->public.credentials);
 302         this->public.credentials->load_crls(this->public.credentials);
 303         this->public.credentials->load_secrets(this->public.credentials);
 304
 305         this->public.interfaces = interface_manager_create();
 306         this->public.backends = backend_manager_create();
 307         this->public.kernel_interface = kernel_interface_create();
 308         this->public.socket = socket_create(IKEV2_UDP_PORT, IKEV2_NATT_PORT);
 309         this->public.sender = sender_create();
 310         this->public.receiver = receiver_create();
 311
 312 }
 313
 314 /**
 315  * Handle SIGSEGV/SIGILL signals raised by threads
 316  */
 317 static void segv_handler(int signal)
 318 {
 319 #ifdef HAVE_BACKTRACE
 320         void *array[20];
 321         size_t size;
 322         char **strings;
 323         size_t i;
 324
 325         size = backtrace(array, 20);
 326         strings = backtrace_symbols(array, size);
 327
 328         DBG1(DBG_JOB, "thread %u received %s. Dumping %d frames from stack:",
 329                  pthread_self(), signal == SIGSEGV ? "SIGSEGV" : "SIGILL", size);
 330
 331         for (i = 0; i < size; i++)
 332         {
 333                 DBG1(DBG_DMN, "    %s", strings[i]);
 334         }
 335         free (strings);
 336 #else /* !HAVE_BACKTRACE */
 337         DBG1(DBG_DMN, "thread %u received %s",
 338                  pthread_self(), signal == SIGSEGV ? "SIGSEGV" : "SIGILL");
 339 #endif /* HAVE_BACKTRACE */
 340         DBG1(DBG_DMN, "killing ourself, received critical signal");
 341         raise(SIGKILL);
 342 }
 343
 344 /**
 345  * Create the daemon.
 346  */
 347 private_daemon_t *daemon_create(void)
 348 {
 349         struct sigaction action;
 350         private_daemon_t *this = malloc_thing(private_daemon_t);
 351
 352         /* assign methods */
 353         this->public.kill = (void (*) (daemon_t*,char*))kill_daemon;
 354
 355         /* NULL members for clean destruction */
 356         this->public.socket = NULL;
 357         this->public.ike_sa_manager = NULL;
 358         this->public.credentials = NULL;
 359         this->public.backends = NULL;
 360         this->public.sender= NULL;
 361         this->public.receiver = NULL;
 362         this->public.scheduler = NULL;
 363         this->public.kernel_interface = NULL;
 364         this->public.processor = NULL;
 365         this->public.interfaces = NULL;
 366         this->public.bus = NULL;
 367         this->public.outlog = NULL;
 368         this->public.syslog = NULL;
 369         this->public.authlog = NULL;
 370
 371         this->main_thread_id = pthread_self();
 372
 373         /* add handler for SEGV and ILL,
 374          * add handler for USR1 (cancellation).
 375          * INT, TERM and HUP are handled by sigwait() in run() */
 376         action.sa_handler = segv_handler;
 377         action.sa_flags = 0;
 378         sigemptyset(&action.sa_mask);
 379         sigaddset(&action.sa_mask, SIGINT);
 380         sigaddset(&action.sa_mask, SIGTERM);
 381         sigaddset(&action.sa_mask, SIGHUP);
 382         sigaction(SIGSEGV, &action, NULL);
 383         sigaction(SIGILL, &action, NULL);
 384         pthread_sigmask(SIG_SETMASK, &action.sa_mask, 0);
 385
 386         return this;
 387 }
 388
 389 /**
 390  * print command line usage and exit
 391  */
 392 static void usage(const char *msg)
 393 {
 394         if (msg != NULL && *msg != '\0')
 395         {
 396                 fprintf(stderr, "%s\n", msg);
 397         }
 398         fprintf(stderr, "Usage: charon\n"
 399                                         "         [--help]\n"
 400                                         "         [--version]\n"
 401                                         "         [--strictcrlpolicy]\n"
 402                                         "         [--cachecrls]\n"
 403                                         "         [--crlcheckinterval <interval>]\n"
 404                                         "         [--eapdir <dir>]\n"
 405                                         "         [--use-syslog]\n"
 406                                         "         [--debug-<type> <level>]\n"
 407                                         "           <type>:  log context type (dmn|mgr|ike|chd|job|cfg|knl|net|enc|lib)\n"
 408                                         "           <level>: log verbosity (-1 = silent, 0 = audit, 1 = control,\n"
 409                                         "                                    2 = controlmore, 3 = raw, 4 = private)\n"
 410                                         "\n"
 411                    );
 412         exit(msg == NULL? 0 : 1);
 413 }
 414
 415 /**
 416  * Main function, manages the daemon.
 417  */
 418 int main(int argc, char *argv[])
 419 {
 420         u_int crl_check_interval = 0;
 421         strict_t strict_crl_policy = STRICT_NO;
 422         bool cache_crls = FALSE;
 423         bool use_syslog = FALSE;
 424         char *eapdir = IPSEC_EAPDIR;
 425
 426         private_daemon_t *private_charon;
 427         FILE *pid_file;
 428         struct stat stb;
 429         linked_list_t *list;
 430         host_t *host;
 431         level_t levels[DBG_MAX];
 432         int signal;
 433
 434         private_charon = daemon_create();
 435         charon = (daemon_t*)private_charon;
 436
 437         /* drop the capabilities we won't need for initialization */
 438         prctl(PR_SET_KEEPCAPS, 1);
 439         drop_capabilities(private_charon, FALSE);
 440
 441         /* use CTRL loglevel for default */
 442         for (signal = 0; signal < DBG_MAX; signal++)
 443         {
 444                 levels[signal] = LEVEL_CTRL;
 445         }
 446
 447         /* handle arguments */
 448         for (;;)
 449         {
 450                 struct option long_opts[] = {
 451                         { "help", no_argument, NULL, 'h' },
 452                         { "version", no_argument, NULL, 'v' },
 453                         { "use-syslog", no_argument, NULL, 'l' },
 454                         { "strictcrlpolicy", required_argument, NULL, 'r' },
 455                         { "cachecrls", no_argument, NULL, 'C' },
 456                         { "crlcheckinterval", required_argument, NULL, 'x' },
 457                         { "eapdir", required_argument, NULL, 'e' },
 458                         /* TODO: handle "debug-all" */
 459                         { "debug-dmn", required_argument, &signal, DBG_DMN },
 460                         { "debug-mgr", required_argument, &signal, DBG_MGR },
 461                         { "debug-ike", required_argument, &signal, DBG_IKE },
 462                         { "debug-chd", required_argument, &signal, DBG_CHD },
 463                         { "debug-job", required_argument, &signal, DBG_JOB },
 464                         { "debug-cfg", required_argument, &signal, DBG_CFG },
 465                         { "debug-knl", required_argument, &signal, DBG_KNL },
 466                         { "debug-net", required_argument, &signal, DBG_NET },
 467                         { "debug-enc", required_argument, &signal, DBG_ENC },
 468                         { "debug-lib", required_argument, &signal, DBG_LIB },
 469                         { 0,0,0,0 }
 470                 };
 471
 472                 int c = getopt_long(argc, argv, "", long_opts, NULL);
 473                 switch (c)
 474                 {
 475                         case EOF:
 476                         break;
 477                         case 'h':
 478                                 usage(NULL);
 479                                 break;
 480                         case 'v':
 481                                 printf("Linux strongSwan %s\n", VERSION);
 482                                 exit(0);
 483                         case 'l':
 484                                 use_syslog = TRUE;
 485                                 continue;
 486                         case 'r':
 487                                 strict_crl_policy = atoi(optarg);
 488                                 continue;
 489                         case 'C':
 490                                 cache_crls = TRUE;
 491                                 continue;
 492                         case 'x':
 493                                 crl_check_interval = atoi(optarg);
 494                                 continue;
 495                         case 'e':
 496                                 eapdir = optarg;
 497                                 continue;
 498                         case 0:
 499                                 /* option is in signal */
 500                                 levels[signal] = atoi(optarg);
 501                                 continue;
 502                         default:
 503                                 usage("");
 504                                 break;
 505                 }
 506                 break;
 507         }
 508
 509         /* initialize daemon */
 510         initialize(private_charon, use_syslog, levels);
 511         /* initialize fetcher_t class */
 512         fetcher_initialize();
 513         /* load pluggable EAP modules */
 514         eap_method_load(eapdir);
 515
 516         /* set strict_crl_policy, cache_crls and crl_check_interval options */
 517         ca_info_set_options(strict_crl_policy, cache_crls, crl_check_interval);
 518
 519         /* check/setup PID file */
 520         if (stat(PID_FILE, &stb) == 0)
 521         {
 522                 DBG1(DBG_DMN, "charon already running (\""PID_FILE"\" exists)");
 523                 destroy(private_charon);
 524                 exit(-1);
 525         }
 526         pid_file = fopen(PID_FILE, "w");
 527         if (pid_file)
 528         {
 529                 fprintf(pid_file, "%d\n", getpid());
 530                 fclose(pid_file);
 531         }
 532
 533         /* log socket info */
 534         list = charon->kernel_interface->create_address_list(charon->kernel_interface);
 535         DBG1(DBG_NET, "listening on %d addresses:", list->get_count(list));
 536         while (list->remove_first(list, (void**)&host) == SUCCESS)
 537         {
 538                 DBG1(DBG_NET, "  %H", host);
 539                 host->destroy(host);
 540         }
 541         list->destroy(list);
 542
 543         /* drop additional capabilites (bind & root) */
 544         drop_capabilities(private_charon, TRUE);
 545
 546         /* start the engine, go multithreaded */
 547         charon->processor->set_threads(charon->processor, WORKER_THREADS);
 548
 549         /* run daemon */
 550         run(private_charon);
 551
 552         eap_method_unload();
 553         fetcher_finalize();
 554         /* normal termination, cleanup and exit */
 555         destroy(private_charon);
 556         unlink(PID_FILE);
 557
 558         return 0;
 559 }
 560