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 <signal.h>
  27 #include <pthread.h>
  28 #include <sys/stat.h>
  29 #include <sys/types.h>
  30 #include <unistd.h>
  31 #include <time.h>
  32 #include <string.h>
  33 #include <getopt.h>
  34 #include <errno.h>
  35 #ifdef HAVE_BACKTRACE
  36 # include <execinfo.h>
  37 #endif /* HAVE_BACKTRACE */
  38
  39 #include "daemon.h"
  40
  41 #include <library.h>
  42 #include <crypto/ca.h>
  43 #include <utils/fetcher.h>
  44 #include <config/credentials/local_credential_store.h>
  45 #include <config/backends/local_backend.h>
  46 #include <sa/authenticators/eap/eap_method.h>
  47
  48
  49 typedef struct private_daemon_t private_daemon_t;
  50
  51 /**
  52  * Private additions to daemon_t, contains threads and internal functions.
  53  */
  54 struct private_daemon_t {
  55         /**
  56          * Public members of daemon_t.
  57          */
  58         daemon_t public;
  59
  60         /**
  61          * Signal set used for signal handling.
  62          */
  63         sigset_t signal_set;
  64
  65         /**
  66          * The thread_id of main-thread.
  67          */
  68         pthread_t main_thread_id;
  69 };
  70
  71 /**
  72  * One and only instance of the daemon.
  73  */
  74 daemon_t *charon;
  75
  76 /**
  77  * hook in library for debugging messages
  78  */
  79 extern void (*dbg) (int level, char *fmt, ...);
  80
  81 /**
  82  * Logging hook for library logs, spreads debug message over bus
  83  */
  84 static void dbg_bus(int level, char *fmt, ...)
  85 {
  86         va_list args;
  87
  88         va_start(args, fmt);
  89         charon->bus->vsignal(charon->bus, DBG_LIB, level, fmt, args);
  90         va_end(args);
  91 }
  92
  93 /**
  94  * Logging hook for library logs, using stderr output
  95  */
  96 static void dbg_stderr(int level, char *fmt, ...)
  97 {
  98         va_list args;
  99
 100         va_start(args, fmt);
 101         fprintf(stderr, "00[LIB] ");
 102         vfprintf(stderr, fmt, args);
 103         fprintf(stderr, "\n");
 104         va_end(args);
 105 }
 106
 107 /**
 108  * Run the daemon and handle unix signals
 109  */
 110 static void run(private_daemon_t *this)
 111 {
 112         /* reselect signals for this thread */
 113         sigemptyset(&(this->signal_set));
 114         sigaddset(&(this->signal_set), SIGINT);
 115         sigaddset(&(this->signal_set), SIGHUP);
 116         sigaddset(&(this->signal_set), SIGTERM);
 117         pthread_sigmask(SIG_BLOCK, &(this->signal_set), 0);
 118
 119         while(TRUE)
 120         {
 121                 int signal_number;
 122                 int error;
 123
 124                 error = sigwait(&(this->signal_set), &signal_number);
 125                 if(error)
 126                 {
 127                         DBG1(DBG_DMN, "error %d while waiting for a signal", error);
 128                         return;
 129                 }
 130                 switch (signal_number)
 131                 {
 132                         case SIGHUP:
 133                         {
 134                                 DBG1(DBG_DMN, "signal of type SIGHUP received. Ignored");
 135                                 break;
 136                         }
 137                         case SIGINT:
 138                         {
 139                                 DBG1(DBG_DMN, "signal of type SIGINT received. Shutting down");
 140                                 return;
 141                         }
 142                         case SIGTERM:
 143                                 DBG1(DBG_DMN, "signal of type SIGTERM received. Shutting down");
 144                                 return;
 145                         default:
 146                         {
 147                                 DBG1(DBG_DMN, "unknown signal %d received. Ignored", signal_number);
 148                                 break;
 149                         }
 150                 }
 151         }
 152 }
 153
 154 /**
 155  * Clean up all daemon resources
 156  */
 157 static void destroy(private_daemon_t *this)
 158 {
 159         /* destruction is a non trivial task, we need to follow
 160         * a strict order to prevent threading issues!
 161         * Kill active threads first, except the sender, as
 162         * the killed IKE_SA want to send delete messages.
 163         */
 164         /* we don't want to receive anything anymore... */
 165         DESTROY_IF(this->public.receiver);
 166         /* ignore all incoming user requests */
 167         DESTROY_IF(this->public.stroke);
 168         DESTROY_IF(this->public.controller);
 169         /* stop scheduing jobs */
 170         DESTROY_IF(this->public.scheduler);
 171         /* stop processing jobs */
 172         DESTROY_IF(this->public.thread_pool);
 173         /* shut down manager with all IKE SAs */
 174         DESTROY_IF(this->public.ike_sa_manager);
 175         /* all child SAs should be down now, so kill kernel interface */
 176         DESTROY_IF(this->public.kernel_interface);
 177         /* destroy other infrastructure */
 178         DESTROY_IF(this->public.job_queue);
 179         DESTROY_IF(this->public.event_queue);
 180         DESTROY_IF(this->public.credentials);
 181         DESTROY_IF(this->public.cfg_store);
 182         DESTROY_IF(this->public.local_backend);
 183         sched_yield();
 184         /* we hope the sender could send the outstanding deletes, but
 185          * we shut down here at any cost */
 186         DESTROY_IF(this->public.sender);
 187         DESTROY_IF(this->public.socket);
 188         /* before destroying bus with its listeners, rehook library logs */
 189         dbg = dbg_stderr;
 190         DESTROY_IF(this->public.bus);
 191         DESTROY_IF(this->public.outlog);
 192         DESTROY_IF(this->public.syslog);
 193         DESTROY_IF(this->public.authlog);
 194         free(this);
 195 }
 196
 197 /**
 198  * Enforce daemon shutdown, with a given reason to do so.
 199  */
 200 static void kill_daemon(private_daemon_t *this, char *reason)
 201 {
 202         /* we send SIGTERM, so the daemon can cleanly shut down */
 203         DBG1(DBG_DMN, "killing daemon: %s", reason);
 204         if (this->main_thread_id == pthread_self())
 205         {
 206                 /* initialization failed, terminate daemon */
 207                 destroy(this);
 208                 unlink(PID_FILE);
 209                 exit(-1);
 210         }
 211         else
 212         {
 213                 DBG1(DBG_DMN, "sending SIGTERM to ourself");
 214                 raise(SIGTERM);
 215                 /* thread must die, since he produced a ciritcal failure and can't continue */
 216                 pthread_exit(NULL);
 217         }
 218 }
 219
 220 /**
 221  * Initialize the daemon, optional with a strict crl policy
 222  */
 223 static void initialize(private_daemon_t *this, bool strict, bool syslog,
 224                                            level_t levels[])
 225 {
 226         credential_store_t* credentials;
 227         signal_t signal;
 228
 229         /* for uncritical pseudo random numbers */
 230         srandom(time(NULL) + getpid());
 231
 232         /* setup bus and it's listeners first to enable log output */
 233         this->public.bus = bus_create();
 234         this->public.outlog = file_logger_create(stdout);
 235         this->public.syslog = sys_logger_create(LOG_DAEMON);
 236         this->public.authlog = sys_logger_create(LOG_AUTHPRIV);
 237         this->public.bus->add_listener(this->public.bus, &this->public.syslog->listener);
 238         this->public.bus->add_listener(this->public.bus, &this->public.outlog->listener);
 239         this->public.bus->add_listener(this->public.bus, &this->public.authlog->listener);
 240         this->public.authlog->set_level(this->public.authlog, SIG_ANY, LEVEL_AUDIT);
 241         /* set up hook to log dbg message in library via charons message bus */
 242         dbg = dbg_bus;
 243
 244         /* apply loglevels */
 245         for (signal = 0; signal < DBG_MAX; signal++)
 246         {
 247                 if (syslog)
 248                 {
 249                         this->public.syslog->set_level(this->public.syslog,
 250                                                                                    signal, levels[signal]);
 251                 }
 252                 else
 253                 {
 254                         this->public.outlog->set_level(this->public.outlog,
 255                                                                                    signal, levels[signal]);
 256                 }
 257         }
 258
 259         DBG1(DBG_DMN, "starting charon (strongSwan Version %s)", VERSION);
 260
 261         this->public.socket = socket_create(IKEV2_UDP_PORT, IKEV2_NATT_PORT);
 262         this->public.ike_sa_manager = ike_sa_manager_create();
 263         this->public.job_queue = job_queue_create();
 264         this->public.event_queue = event_queue_create();
 265         this->public.credentials = (credential_store_t*)local_credential_store_create(strict);
 266         this->public.cfg_store = cfg_store_create();
 267         this->public.local_backend = local_backend_create();
 268         this->public.cfg_store->register_backend(this->public.cfg_store,
 269                                                                                         &this->public.local_backend->backend);
 270
 271         /* initialize fetcher_t class */
 272         fetcher_initialize();
 273
 274         /* load secrets, ca certificates and crls */
 275         credentials = this->public.credentials;
 276         credentials->load_ca_certificates(credentials);
 277         credentials->load_aa_certificates(credentials);
 278         credentials->load_attr_certificates(credentials);
 279         credentials->load_ocsp_certificates(credentials);
 280         credentials->load_crls(credentials);
 281         credentials->load_secrets(credentials);
 282
 283         /* start building threads, we are multi-threaded NOW */
 284         this->public.controller = controller_create();
 285         this->public.stroke = stroke_create(this->public.local_backend);
 286         this->public.sender = sender_create();
 287         this->public.receiver = receiver_create();
 288         this->public.scheduler = scheduler_create();
 289         this->public.kernel_interface = kernel_interface_create();
 290         this->public.thread_pool = thread_pool_create(NUMBER_OF_WORKING_THREADS);
 291 }
 292
 293 /**
 294  * Handle SIGSEGV/SIGILL signals raised by threads
 295  */
 296 void signal_handler(int signal)
 297 {
 298 #ifdef HAVE_BACKTRACE
 299         void *array[20];
 300         size_t size;
 301         char **strings;
 302         size_t i;
 303
 304         size = backtrace(array, 20);
 305         strings = backtrace_symbols(array, size);
 306
 307         DBG1(DBG_DMN, "thread %u received %s. Dumping %d frames from stack:",
 308                  pthread_self(), signal == SIGSEGV ? "SIGSEGV" : "SIGILL", size);
 309
 310         for (i = 0; i < size; i++)
 311         {
 312                 DBG1(DBG_DMN, "    %s", strings[i]);
 313         }
 314         free (strings);
 315 #else /* !HAVE_BACKTRACE */
 316         DBG1(DBG_DMN, "thread %u received %s",
 317                  pthread_self(), signal == SIGSEGV ? "SIGSEGV" : "SIGILL");
 318 #endif /* HAVE_BACKTRACE */
 319         DBG1(DBG_DMN, "killing ourself hard after SIGSEGV");
 320         raise(SIGKILL);
 321 }
 322
 323 /**
 324  * Create the daemon.
 325  */
 326 private_daemon_t *daemon_create(void)
 327 {
 328         private_daemon_t *this = malloc_thing(private_daemon_t);
 329         struct sigaction action;
 330
 331         /* assign methods */
 332         this->public.kill = (void (*) (daemon_t*,char*))kill_daemon;
 333
 334         /* NULL members for clean destruction */
 335         this->public.socket = NULL;
 336         this->public.ike_sa_manager = NULL;
 337         this->public.job_queue = NULL;
 338         this->public.event_queue = NULL;
 339         this->public.credentials = NULL;
 340         this->public.cfg_store = NULL;
 341         this->public.local_backend = NULL;
 342         this->public.sender= NULL;
 343         this->public.receiver = NULL;
 344         this->public.scheduler = NULL;
 345         this->public.kernel_interface = NULL;
 346         this->public.thread_pool = NULL;
 347         this->public.controller = NULL;
 348         this->public.stroke = NULL;
 349         this->public.bus = NULL;
 350         this->public.outlog = NULL;
 351         this->public.syslog = NULL;
 352         this->public.authlog = NULL;
 353
 354         this->main_thread_id = pthread_self();
 355
 356         /* setup signal handling for all threads */
 357         sigemptyset(&(this->signal_set));
 358         sigaddset(&(this->signal_set), SIGSEGV);
 359         sigaddset(&(this->signal_set), SIGINT);
 360         sigaddset(&(this->signal_set), SIGHUP);
 361         sigaddset(&(this->signal_set), SIGTERM);
 362         pthread_sigmask(SIG_BLOCK, &(this->signal_set), 0);
 363
 364         /* setup SIGSEGV handler for all threads */
 365         action.sa_handler = signal_handler;
 366         action.sa_mask = this->signal_set;
 367         action.sa_flags = 0;
 368         sigaction(SIGSEGV, &action, NULL);
 369         sigaction(SIGILL, &action, NULL);
 370         return this;
 371 }
 372
 373 /**
 374  * print command line usage and exit
 375  */
 376 static void usage(const char *msg)
 377 {
 378         if (msg != NULL && *msg != '\0')
 379         {
 380                 fprintf(stderr, "%s\n", msg);
 381         }
 382         fprintf(stderr, "Usage: charon\n"
 383                                         "         [--help]\n"
 384                                         "         [--version]\n"
 385                                         "         [--strictcrlpolicy]\n"
 386                                         "         [--cachecrls]\n"
 387                                         "         [--crlcheckinterval <interval>]\n"
 388                                         "         [--eapdir <dir>]\n"
 389                                         "         [--use-syslog]\n"
 390                                         "         [--debug-<type> <level>]\n"
 391                                         "           <type>:  log context type (dmn|mgr|ike|chd|job|cfg|knl|net|enc|lib)\n"
 392                                         "           <level>: log verbosity (-1 = silent, 0 = audit, 1 = control,\n"
 393                                         "                                    2 = controlmore, 3 = raw, 4 = private)\n"
 394                                         "\n"
 395                    );
 396         exit(msg == NULL? 0 : 1);
 397 }
 398
 399 /**
 400  * Main function, manages the daemon.
 401  */
 402 int main(int argc, char *argv[])
 403 {
 404         u_int crl_check_interval = 0;
 405         bool strict_crl_policy = FALSE;
 406         bool cache_crls = FALSE;
 407         bool use_syslog = FALSE;
 408         char *eapdir = IPSEC_EAPDIR;
 409
 410         private_daemon_t *private_charon;
 411         FILE *pid_file;
 412         struct stat stb;
 413         linked_list_t *list;
 414         host_t *host;
 415         level_t levels[DBG_MAX];
 416         int signal;
 417
 418         /* use CTRL loglevel for default */
 419         for (signal = 0; signal < DBG_MAX; signal++)
 420         {
 421                 levels[signal] = LEVEL_CTRL;
 422         }
 423
 424         /* handle arguments */
 425         for (;;)
 426         {
 427                 struct option long_opts[] = {
 428                         { "help", no_argument, NULL, 'h' },
 429                         { "version", no_argument, NULL, 'v' },
 430                         { "use-syslog", no_argument, NULL, 'l' },
 431                         { "strictcrlpolicy", no_argument, NULL, 'r' },
 432                         { "cachecrls", no_argument, NULL, 'C' },
 433                         { "crlcheckinterval", required_argument, NULL, 'x' },
 434                         { "eapdir", required_argument, NULL, 'e' },
 435                         /* TODO: handle "debug-all" */
 436                         { "debug-dmn", required_argument, &signal, DBG_DMN },
 437                         { "debug-mgr", required_argument, &signal, DBG_MGR },
 438                         { "debug-ike", required_argument, &signal, DBG_IKE },
 439                         { "debug-chd", required_argument, &signal, DBG_CHD },
 440                         { "debug-job", required_argument, &signal, DBG_JOB },
 441                         { "debug-cfg", required_argument, &signal, DBG_CFG },
 442                         { "debug-knl", required_argument, &signal, DBG_KNL },
 443                         { "debug-net", required_argument, &signal, DBG_NET },
 444                         { "debug-enc", required_argument, &signal, DBG_ENC },
 445                         { "debug-lib", required_argument, &signal, DBG_LIB },
 446                         { 0,0,0,0 }
 447                 };
 448
 449                 int c = getopt_long(argc, argv, "", long_opts, NULL);
 450                 switch (c)
 451                 {
 452                         case EOF:
 453                         break;
 454                         case 'h':
 455                                 usage(NULL);
 456                                 break;
 457                         case 'v':
 458                                 printf("Linux strongSwan %s\n", VERSION);
 459                                 exit(0);
 460                         case 'l':
 461                                 use_syslog = TRUE;
 462                                 continue;
 463                         case 'r':
 464                                 strict_crl_policy = TRUE;
 465                                 continue;
 466                         case 'C':
 467                                 cache_crls = TRUE;
 468                                 continue;
 469                         case 'x':
 470                                 crl_check_interval = atoi(optarg);
 471                                 continue;
 472                         case 'e':
 473                                 eapdir = optarg;
 474                                 continue;
 475                         case 0:
 476                                 /* option is in signal */
 477                                 levels[signal] = atoi(optarg);
 478                                 continue;
 479                         default:
 480                                 usage("");
 481                                 break;
 482                 }
 483                 break;
 484         }
 485
 486         private_charon = daemon_create();
 487         charon = (daemon_t*)private_charon;
 488
 489         /* initialize daemon */
 490         initialize(private_charon, strict_crl_policy, use_syslog, levels);
 491
 492         /* load pluggable EAP modules */
 493         eap_method_load(eapdir);
 494
 495         /* set cache_crls and crl_check_interval options */
 496         ca_info_set_options(cache_crls, crl_check_interval);
 497
 498         /* check/setup PID file */
 499         if (stat(PID_FILE, &stb) == 0)
 500         {
 501                 DBG1(DBG_DMN, "charon already running (\""PID_FILE"\" exists)");
 502                 destroy(private_charon);
 503                 exit(-1);
 504         }
 505         pid_file = fopen(PID_FILE, "w");
 506         if (pid_file)
 507         {
 508                 fprintf(pid_file, "%d\n", getpid());
 509                 fclose(pid_file);
 510         }
 511
 512         /* log socket info */
 513         list = charon->kernel_interface->create_address_list(charon->kernel_interface);
 514         DBG1(DBG_NET, "listening on %d addresses:", list->get_count(list));
 515         while (list->remove_first(list, (void**)&host) == SUCCESS)
 516         {
 517                 DBG1(DBG_NET, "  %H", host);
 518                 host->destroy(host);
 519         }
 520         list->destroy(list);
 521
 522         /* run daemon */
 523         run(private_charon);
 524
 525         eap_method_unload();
 526         fetcher_finalize();
 527         /* normal termination, cleanup and exit */
 528         destroy(private_charon);
 529         unlink(PID_FILE);
 530
 531         return 0;
 532 }