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