src/charon/daemon.c

   1 /*
   2  * Copyright (C) 2006-2007 Tobias Brunner
   3  * Copyright (C) 2006 Daniel Roethlisberger
   4  * Copyright (C) 2005-2008 Martin Willi
   5  * Copyright (C) 2005 Jan Hutter
   6  * Hochschule fuer Technik Rapperswil
   7  *
   8  * This program is free software; you can redistribute it and/or modify it
   9  * under the terms of the GNU General Public License as published by the
  10  * Free Software Foundation; either version 2 of the License, or (at your
  11  * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
  12  *
  13  * This program is distributed in the hope that it will be useful, but
  14  * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  15  * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  16  * for more details.
  17  */
  18
  19 #ifdef HAVE_DLADDR
  20 # define _GNU_SOURCE
  21 # include <dlfcn.h>
  22 #endif /* HAVE_DLADDR */
  23
  24 #include <stdio.h>
  25 #include <sys/prctl.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 #include <pwd.h>
  36 #include <grp.h>
  37 #ifdef HAVE_BACKTRACE
  38 # include <execinfo.h>
  39 #endif /* HAVE_BACKTRACE */
  40 #ifdef CAPABILITIES
  41 #include <sys/capability.h>
  42 #endif /* CAPABILITIES */
  43
  44 #include "daemon.h"
  45
  46 #include <library.h>
  47 #include <config/traffic_selector.h>
  48 #include <config/proposal.h>
  49
  50 #ifdef INTEGRITY_TEST
  51 #include <fips/fips.h>
  52 #include <fips/fips_signature.h>
  53 #endif /* INTEGRITY_TEST */
  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 #ifdef CAPABILITIES
  77         /**
  78          * capabilities to keep
  79          */
  80         cap_t caps;
  81 #endif /* CAPABILITIES */
  82 };
  83
  84 /**
  85  * One and only instance of the daemon.
  86  */
  87 daemon_t *charon;
  88
  89 /**
  90  * hook in library for debugging messages
  91  */
  92 extern void (*dbg) (int level, char *fmt, ...);
  93
  94 /**
  95  * Logging hook for library logs, spreads debug message over bus
  96  */
  97 static void dbg_bus(int level, char *fmt, ...)
  98 {
  99         va_list args;
 100
 101         va_start(args, fmt);
 102         charon->bus->vsignal(charon->bus, DBG_LIB, level, NULL, fmt, args);
 103         va_end(args);
 104 }
 105
 106 /**
 107  * Logging hook for library logs, using stderr output
 108  */
 109 static void dbg_stderr(int level, char *fmt, ...)
 110 {
 111         va_list args;
 112
 113         if (level <= 1)
 114         {
 115                 va_start(args, fmt);
 116                 fprintf(stderr, "00[LIB] ");
 117                 vfprintf(stderr, fmt, args);
 118                 fprintf(stderr, "\n");
 119                 va_end(args);
 120         }
 121 }
 122
 123 /**
 124  * Run the daemon and handle unix signals
 125  */
 126 static void run(private_daemon_t *this)
 127 {
 128         sigset_t set;
 129
 130         /* handle SIGINT, SIGHUP ans SIGTERM in this handler */
 131         sigemptyset(&set);
 132         sigaddset(&set, SIGINT);
 133         sigaddset(&set, SIGHUP);
 134         sigaddset(&set, SIGTERM);
 135
 136         while (TRUE)
 137         {
 138                 int sig;
 139                 int error;
 140
 141                 error = sigwait(&set, &sig);
 142                 if (error)
 143                 {
 144                         DBG1(DBG_DMN, "error %d while waiting for a signal", error);
 145                         return;
 146                 }
 147                 switch (sig)
 148                 {
 149                         case SIGHUP:
 150                         {
 151                                 DBG1(DBG_DMN, "signal of type SIGHUP received. Ignored");
 152                                 break;
 153                         }
 154                         case SIGINT:
 155                         {
 156                                 DBG1(DBG_DMN, "signal of type SIGINT received. Shutting down");
 157                                 return;
 158                         }
 159                         case SIGTERM:
 160                         {
 161                                 DBG1(DBG_DMN, "signal of type SIGTERM received. Shutting down");
 162                                 return;
 163                         }
 164                         default:
 165                         {
 166                                 DBG1(DBG_DMN, "unknown signal %d received. Ignored", sig);
 167                                 break;
 168                         }
 169                 }
 170         }
 171 }
 172
 173 /**
 174  * Clean up all daemon resources
 175  */
 176 static void destroy(private_daemon_t *this)
 177 {
 178         /* terminate all idle threads */
 179         if (this->public.processor)
 180         {
 181                 this->public.processor->set_threads(this->public.processor, 0);
 182         }
 183         /* close all IKE_SAs */
 184         if (this->public.ike_sa_manager)
 185         {
 186                 this->public.ike_sa_manager->flush(this->public.ike_sa_manager);
 187         }
 188         /* unload plugins to release threads */
 189         lib->plugins->unload(lib->plugins);
 190 #ifdef CAPABILITIES
 191         cap_free(this->caps);
 192 #endif /* CAPABILITIES */
 193         DESTROY_IF(this->public.ike_sa_manager);
 194         DESTROY_IF(this->public.kernel_interface);
 195         DESTROY_IF(this->public.scheduler);
 196         DESTROY_IF(this->public.controller);
 197         DESTROY_IF(this->public.eap);
 198         DESTROY_IF(this->public.sim);
 199 #ifdef ME
 200         DESTROY_IF(this->public.connect_manager);
 201         DESTROY_IF(this->public.mediation_manager);
 202 #endif /* ME */
 203         DESTROY_IF(this->public.backends);
 204         DESTROY_IF(this->public.attributes);
 205         DESTROY_IF(this->public.credentials);
 206         DESTROY_IF(this->public.sender);
 207         DESTROY_IF(this->public.receiver);
 208         DESTROY_IF(this->public.socket);
 209         /* wait until all threads are gone */
 210         DESTROY_IF(this->public.processor);
 211
 212         /* rehook library logging, shutdown logging */
 213         dbg = dbg_stderr;
 214         DESTROY_IF(this->public.bus);
 215         DESTROY_IF(this->public.outlog);
 216         DESTROY_IF(this->public.syslog);
 217         DESTROY_IF(this->public.authlog);
 218         free(this);
 219 }
 220
 221 /**
 222  * Enforce daemon shutdown, with a given reason to do so.
 223  */
 224 static void kill_daemon(private_daemon_t *this, char *reason)
 225 {
 226         /* we send SIGTERM, so the daemon can cleanly shut down */
 227         if (this->public.bus)
 228         {
 229                 DBG1(DBG_DMN, "killing daemon: %s", reason);
 230         }
 231         else
 232         {
 233                 fprintf(stderr, "killing daemon: %s\n", reason);
 234         }
 235         if (this->main_thread_id == pthread_self())
 236         {
 237                 /* initialization failed, terminate daemon */
 238                 unlink(PID_FILE);
 239                 exit(-1);
 240         }
 241         else
 242         {
 243                 DBG1(DBG_DMN, "sending SIGTERM to ourself");
 244                 raise(SIGTERM);
 245                 /* thread must die, since he produced a ciritcal failure and can't continue */
 246                 pthread_exit(NULL);
 247         }
 248 }
 249
 250 /**
 251  * drop daemon capabilities
 252  */
 253 static void drop_capabilities(private_daemon_t *this)
 254 {
 255         prctl(PR_SET_KEEPCAPS, 1);
 256
 257         if (setgid(charon->gid) != 0)
 258         {
 259                 kill_daemon(this, "change to unprivileged group failed");
 260         }
 261         if (setuid(charon->uid) != 0)
 262         {
 263                 kill_daemon(this, "change to unprivileged user failed");
 264         }
 265
 266 #ifdef CAPABILITIES
 267         if (cap_set_proc(this->caps) != 0)
 268         {
 269                 kill_daemon(this, "unable to drop daemon capabilities");
 270         }
 271 #endif /* CAPABILITIES */
 272 }
 273
 274 /**
 275  * Implementation of daemon_t.keep_cap
 276  */
 277 static void keep_cap(private_daemon_t *this, u_int cap)
 278 {
 279 #ifdef CAPABILITIES
 280         cap_set_flag(this->caps, CAP_EFFECTIVE, 1, &cap, CAP_SET);
 281         cap_set_flag(this->caps, CAP_INHERITABLE, 1, &cap, CAP_SET);
 282         cap_set_flag(this->caps, CAP_PERMITTED, 1, &cap, CAP_SET);
 283 #endif /* CAPABILITIES */
 284 }
 285
 286 /**
 287  * lookup UID and GID
 288  */
 289 static void lookup_uid_gid(private_daemon_t *this)
 290 {
 291 #ifdef IPSEC_USER
 292         {
 293                 char buf[1024];
 294                 struct passwd passwd, *pwp;
 295
 296                 if (getpwnam_r(IPSEC_USER, &passwd, buf, sizeof(buf), &pwp) != 0 ||
 297                         pwp == NULL)
 298                 {
 299                         kill_daemon(this, "resolving user '"IPSEC_USER"' failed");
 300                 }
 301                 charon->uid = pwp->pw_uid;
 302         }
 303 #endif
 304 #ifdef IPSEC_GROUP
 305         {
 306                 char buf[1024];
 307                 struct group group, *grp;
 308
 309                 if (getgrnam_r(IPSEC_GROUP, &group, buf, sizeof(buf), &grp) != 0 ||
 310                         grp == NULL)
 311                 {
 312                         kill_daemon(this, "reslvoing group '"IPSEC_GROUP"' failed");
 313                 }
 314                 charon->gid = grp->gr_gid;
 315         }
 316 #endif
 317 }
 318
 319 /**
 320  * Initialize the daemon
 321  */
 322 static bool initialize(private_daemon_t *this, bool syslog, level_t levels[])
 323 {
 324         signal_t signal;
 325
 326         /* for uncritical pseudo random numbers */
 327         srandom(time(NULL) + getpid());
 328
 329         /* setup bus and it's listeners first to enable log output */
 330         this->public.bus = bus_create();
 331         this->public.outlog = file_logger_create(stdout);
 332         this->public.syslog = sys_logger_create(LOG_DAEMON);
 333         this->public.authlog = sys_logger_create(LOG_AUTHPRIV);
 334         this->public.bus->add_listener(this->public.bus, &this->public.syslog->listener);
 335         this->public.bus->add_listener(this->public.bus, &this->public.outlog->listener);
 336         this->public.bus->add_listener(this->public.bus, &this->public.authlog->listener);
 337         this->public.authlog->set_level(this->public.authlog, SIG_ANY, LEVEL_AUDIT);
 338         /* set up hook to log dbg message in library via charons message bus */
 339         dbg = dbg_bus;
 340
 341         /* apply loglevels */
 342         for (signal = 0; signal < DBG_MAX; signal++)
 343         {
 344                 this->public.syslog->set_level(this->public.syslog,
 345                                                                            signal, levels[signal]);
 346                 if (!syslog)
 347                 {
 348                         this->public.outlog->set_level(this->public.outlog,
 349                                                                                    signal, levels[signal]);
 350                 }
 351         }
 352
 353         DBG1(DBG_DMN, "starting charon (strongSwan Version %s)", VERSION);
 354
 355         /* load secrets, ca certificates and crls */
 356         this->public.processor = processor_create();
 357         this->public.scheduler = scheduler_create();
 358         this->public.credentials = credential_manager_create();
 359         this->public.controller = controller_create();
 360         this->public.eap = eap_manager_create();
 361         this->public.sim = sim_manager_create();
 362         this->public.backends = backend_manager_create();
 363         this->public.attributes = attribute_manager_create();
 364         this->public.kernel_interface = kernel_interface_create();
 365         this->public.socket = socket_create();
 366
 367         /* load plugins, further infrastructure may need it */
 368         lib->plugins->load(lib->plugins, IPSEC_PLUGINDIR,
 369                 lib->settings->get_str(lib->settings, "charon.load", PLUGINS));
 370
 371         /* create the kernel interfaces */
 372         this->public.kernel_interface->create_interfaces(this->public.kernel_interface);
 373
 374 #ifdef INTEGRITY_TEST
 375         DBG1(DBG_DMN, "integrity test of libstrongswan code");
 376         if (fips_verify_hmac_signature(hmac_key, hmac_signature))
 377         {
 378                 DBG1(DBG_DMN, "  integrity test passed");
 379         }
 380         else
 381         {
 382                 DBG1(DBG_DMN, "  integrity test failed");
 383                 return FALSE;
 384         }
 385 #endif /* INTEGRITY_TEST */
 386
 387         this->public.ike_sa_manager = ike_sa_manager_create();
 388         if (this->public.ike_sa_manager == NULL)
 389         {
 390                 return FALSE;
 391         }
 392         this->public.sender = sender_create();
 393         this->public.receiver = receiver_create();
 394         if (this->public.receiver == NULL)
 395         {
 396                 return FALSE;
 397         }
 398
 399 #ifdef ME
 400         this->public.connect_manager = connect_manager_create();
 401         if (this->public.connect_manager == NULL)
 402         {
 403                 return FALSE;
 404         }
 405         this->public.mediation_manager = mediation_manager_create();
 406 #endif /* ME */
 407
 408         return TRUE;
 409 }
 410
 411 /**
 412  * Handle SIGSEGV/SIGILL signals raised by threads
 413  */
 414 static void segv_handler(int signal)
 415 {
 416 #ifdef HAVE_BACKTRACE
 417         void *array[20];
 418         size_t size;
 419         char **strings;
 420         size_t i;
 421
 422         size = backtrace(array, 20);
 423         strings = backtrace_symbols(array, size);
 424
 425         DBG1(DBG_JOB, "thread %u received %s. Dumping %d frames from stack:",
 426                  pthread_self(), signal == SIGSEGV ? "SIGSEGV" : "SIGILL", size);
 427
 428         for (i = 0; i < size; i++)
 429         {
 430 #ifdef HAVE_DLADDR
 431                 Dl_info info;
 432
 433                 if (dladdr(array[i], &info))
 434                 {
 435                         void *ptr = array[i];
 436                         if (strstr(info.dli_fname, ".so"))
 437                         {
 438                                 ptr = (void*)(array[i] - info.dli_fbase);
 439                         }
 440                         DBG1(DBG_DMN, "    %s [%p]", info.dli_fname, ptr);
 441                 }
 442                 else
 443                 {
 444 #endif /* HAVE_DLADDR */
 445                         DBG1(DBG_DMN, "    %s", strings[i]);
 446 #ifdef HAVE_DLADDR
 447                 }
 448 #endif /* HAVE_DLADDR */
 449         }
 450         free (strings);
 451 #else /* !HAVE_BACKTRACE */
 452         DBG1(DBG_DMN, "thread %u received %s",
 453                  pthread_self(), signal == SIGSEGV ? "SIGSEGV" : "SIGILL");
 454 #endif /* HAVE_BACKTRACE */
 455         DBG1(DBG_DMN, "killing ourself, received critical signal");
 456         raise(SIGKILL);
 457 }
 458
 459 /**
 460  * Create the daemon.
 461  */
 462 private_daemon_t *daemon_create(void)
 463 {
 464         struct sigaction action;
 465         private_daemon_t *this = malloc_thing(private_daemon_t);
 466
 467         /* assign methods */
 468         this->public.kill = (void (*) (daemon_t*,char*))kill_daemon;
 469         this->public.keep_cap = (void(*)(daemon_t*, u_int cap))keep_cap;
 470
 471         /* NULL members for clean destruction */
 472         this->public.socket = NULL;
 473         this->public.ike_sa_manager = NULL;
 474         this->public.credentials = NULL;
 475         this->public.backends = NULL;
 476         this->public.attributes = NULL;
 477         this->public.sender= NULL;
 478         this->public.receiver = NULL;
 479         this->public.scheduler = NULL;
 480         this->public.kernel_interface = NULL;
 481         this->public.processor = NULL;
 482         this->public.controller = NULL;
 483         this->public.eap = NULL;
 484         this->public.sim = NULL;
 485         this->public.bus = NULL;
 486         this->public.outlog = NULL;
 487         this->public.syslog = NULL;
 488         this->public.authlog = NULL;
 489 #ifdef ME
 490         this->public.connect_manager = NULL;
 491         this->public.mediation_manager = NULL;
 492 #endif /* ME */
 493         this->public.uid = 0;
 494         this->public.gid = 0;
 495
 496         this->main_thread_id = pthread_self();
 497 #ifdef CAPABILITIES
 498         this->caps = cap_init();
 499         keep_cap(this, CAP_NET_ADMIN);
 500         if (lib->leak_detective)
 501         {
 502                 keep_cap(this, CAP_SYS_NICE);
 503         }
 504 #endif /* CAPABILITIES */
 505
 506         /* add handler for SEGV and ILL,
 507          * add handler for USR1 (cancellation).
 508          * INT, TERM and HUP are handled by sigwait() in run() */
 509         action.sa_handler = segv_handler;
 510         action.sa_flags = 0;
 511         sigemptyset(&action.sa_mask);
 512         sigaddset(&action.sa_mask, SIGINT);
 513         sigaddset(&action.sa_mask, SIGTERM);
 514         sigaddset(&action.sa_mask, SIGHUP);
 515         sigaction(SIGSEGV, &action, NULL);
 516         sigaction(SIGILL, &action, NULL);
 517         action.sa_handler = SIG_IGN;
 518         sigaction(SIGPIPE, &action, NULL);
 519
 520         pthread_sigmask(SIG_SETMASK, &action.sa_mask, 0);
 521
 522         return this;
 523 }
 524
 525 /**
 526  * print command line usage and exit
 527  */
 528 static void usage(const char *msg)
 529 {
 530         if (msg != NULL && *msg != '\0')
 531         {
 532                 fprintf(stderr, "%s\n", msg);
 533         }
 534         fprintf(stderr, "Usage: charon\n"
 535                                         "         [--help]\n"
 536                                         "         [--version]\n"
 537                                         "         [--use-syslog]\n"
 538                                         "         [--debug-<type> <level>]\n"
 539                                         "           <type>:  log context type (dmn|mgr|ike|chd|job|cfg|knl|net|enc|lib)\n"
 540                                         "           <level>: log verbosity (-1 = silent, 0 = audit, 1 = control,\n"
 541                                         "                                    2 = controlmore, 3 = raw, 4 = private)\n"
 542                                         "\n"
 543                    );
 544         exit(msg == NULL? 0 : 1);
 545 }
 546
 547 /**
 548  * Main function, manages the daemon.
 549  */
 550 int main(int argc, char *argv[])
 551 {
 552         bool use_syslog = FALSE;
 553
 554         private_daemon_t *private_charon;
 555         FILE *pid_file;
 556         struct stat stb;
 557         level_t levels[DBG_MAX];
 558         int signal;
 559
 560         /* logging for library during initialization, as we have no bus yet */
 561         dbg = dbg_stderr;
 562
 563         /* initialize library */
 564         library_init(STRONGSWAN_CONF);
 565         lib->printf_hook->add_handler(lib->printf_hook, 'R',
 566                                                                   traffic_selector_get_printf_hooks());
 567         lib->printf_hook->add_handler(lib->printf_hook, 'P',
 568                                                                   proposal_get_printf_hooks());
 569         private_charon = daemon_create();
 570         charon = (daemon_t*)private_charon;
 571
 572         lookup_uid_gid(private_charon);
 573
 574         /* use CTRL loglevel for default */
 575         for (signal = 0; signal < DBG_MAX; signal++)
 576         {
 577                 levels[signal] = LEVEL_CTRL;
 578         }
 579
 580         /* handle arguments */
 581         for (;;)
 582         {
 583                 struct option long_opts[] = {
 584                         { "help", no_argument, NULL, 'h' },
 585                         { "version", no_argument, NULL, 'v' },
 586                         { "use-syslog", no_argument, NULL, 'l' },
 587                         /* TODO: handle "debug-all" */
 588                         { "debug-dmn", required_argument, &signal, DBG_DMN },
 589                         { "debug-mgr", required_argument, &signal, DBG_MGR },
 590                         { "debug-ike", required_argument, &signal, DBG_IKE },
 591                         { "debug-chd", required_argument, &signal, DBG_CHD },
 592                         { "debug-job", required_argument, &signal, DBG_JOB },
 593                         { "debug-cfg", required_argument, &signal, DBG_CFG },
 594                         { "debug-knl", required_argument, &signal, DBG_KNL },
 595                         { "debug-net", required_argument, &signal, DBG_NET },
 596                         { "debug-enc", required_argument, &signal, DBG_ENC },
 597                         { "debug-lib", required_argument, &signal, DBG_LIB },
 598                         { 0,0,0,0 }
 599                 };
 600
 601                 int c = getopt_long(argc, argv, "", long_opts, NULL);
 602                 switch (c)
 603                 {
 604                         case EOF:
 605                         break;
 606                         case 'h':
 607                                 usage(NULL);
 608                                 break;
 609                         case 'v':
 610                                 printf("Linux strongSwan %s\n", VERSION);
 611                                 exit(0);
 612                         case 'l':
 613                                 use_syslog = TRUE;
 614                                 continue;
 615                         case 0:
 616                                 /* option is in signal */
 617                                 levels[signal] = atoi(optarg);
 618                                 continue;
 619                         default:
 620                                 usage("");
 621                                 break;
 622                 }
 623                 break;
 624         }
 625
 626         /* initialize daemon */
 627         if (!initialize(private_charon, use_syslog, levels))
 628         {
 629                 DBG1(DBG_DMN, "initialization failed - aborting charon");
 630                 destroy(private_charon);
 631                 exit(-1);
 632         }
 633
 634         /* check/setup PID file */
 635         if (stat(PID_FILE, &stb) == 0)
 636         {
 637                 DBG1(DBG_DMN, "charon already running (\""PID_FILE"\" exists)");
 638                 destroy(private_charon);
 639                 exit(-1);
 640         }
 641         pid_file = fopen(PID_FILE, "w");
 642         if (pid_file)
 643         {
 644                 fprintf(pid_file, "%d\n", getpid());
 645                 fchown(fileno(pid_file), charon->uid, charon->gid);
 646                 fclose(pid_file);
 647         }
 648
 649         /* drop the capabilities we won't need */
 650         drop_capabilities(private_charon);
 651
 652         /* start the engine, go multithreaded */
 653         charon->processor->set_threads(charon->processor,
 654                                                 lib->settings->get_int(lib->settings, "charon.threads",
 655                                                                                            DEFAULT_THREADS));
 656
 657         /* run daemon */
 658         run(private_charon);
 659
 660         /* normal termination, cleanup and exit */
 661         destroy(private_charon);
 662         unlink(PID_FILE);
 663
 664         library_deinit();
 665
 666         return 0;
 667 }
 668