065f7d7018ea21d1c361f1a0278a22bd32376538
[strongswan.git] / 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