summaryrefslogtreecommitdiff
path: root/src/libcharon/daemon.c
blob: b1b8f57f0a15723969074a7802fb67efc4452d3e (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
/*
 * Copyright (C) 2006-2012 Tobias Brunner
 * Copyright (C) 2005-2009 Martin Willi
 * Copyright (C) 2006 Daniel Roethlisberger
 * Copyright (C) 2005 Jan Hutter
 * Hochschule fuer Technik Rapperswil
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the
 * Free Software Foundation; either version 2 of the License, or (at your
 * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
 * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * for more details.
 */

#include <stdio.h>
#include <sys/types.h>
#include <unistd.h>
#include <time.h>
#include <errno.h>

#ifdef HAVE_SYSLOG
#include <syslog.h>
#endif

#include "daemon.h"

#include <library.h>
#include <bus/listeners/sys_logger.h>
#include <bus/listeners/file_logger.h>
#include <config/proposal.h>
#include <plugins/plugin_feature.h>
#include <kernel/kernel_handler.h>
#include <processing/jobs/start_action_job.h>
#include <threading/mutex.h>

#ifndef LOG_AUTHPRIV /* not defined on OpenSolaris */
#define LOG_AUTHPRIV LOG_AUTH
#endif

typedef struct private_daemon_t private_daemon_t;

/**
 * Private additions to daemon_t, contains threads and internal functions.
 */
struct private_daemon_t {
	/**
	 * Public members of daemon_t.
	 */
	daemon_t public;

	/**
	 * Handler for kernel events
	 */
	kernel_handler_t *kernel_handler;

	/**
	 * A list of installed loggers (as logger_entry_t*)
	 */
	linked_list_t *loggers;

	/**
	 * Identifier used for syslog (in the openlog call)
	 */
	char *syslog_identifier;

	/**
	 * Mutex for configured loggers
	 */
	mutex_t *mutex;

	/**
	 * Integrity check failed?
	 */
	bool integrity_failed;

	/**
	 * Number of times we have been initialized
	 */
	refcount_t ref;
};

/**
 * One and only instance of the daemon.
 */
daemon_t *charon;

/**
 * hook in library for debugging messages
 */
extern void (*dbg) (debug_t group, level_t level, char *fmt, ...);

/**
 * we store the previous debug function so we can reset it
 */
static void (*dbg_old) (debug_t group, level_t level, char *fmt, ...);

/**
 * Logging hook for library logs, spreads debug message over bus
 */
static void dbg_bus(debug_t group, level_t level, char *fmt, ...)
{
	va_list args;

	va_start(args, fmt);
	charon->bus->vlog(charon->bus, group, level, fmt, args);
	va_end(args);
}

/**
 * Some metadata about configured loggers
 */
typedef struct {
	/**
	 * Target of the logger (syslog facility or filename)
	 */
	char *target;

	/**
	 * TRUE if this is a file logger
	 */
	bool file;

	/**
	 * The actual logger
	 */
	union {
		sys_logger_t *sys;
		file_logger_t *file;
	} logger;

} logger_entry_t;

/**
 * Destroy a logger entry
 */
static void logger_entry_destroy(logger_entry_t *this)
{
	if (this->file)
	{
		DESTROY_IF(this->logger.file);
	}
	else
	{
		DESTROY_IF(this->logger.sys);
	}
	free(this->target);
	free(this);
}

/**
 * Unregister and destroy a logger entry
 */
static void logger_entry_unregister_destroy(logger_entry_t *this)
{
	if (this->file)
	{
		charon->bus->remove_logger(charon->bus, &this->logger.file->logger);
	}
	else
	{
		charon->bus->remove_logger(charon->bus, &this->logger.sys->logger);
	}
	logger_entry_destroy(this);
}

/**
 * Match a logger entry by target and whether it is a file or syslog logger
 */
static bool logger_entry_match(logger_entry_t *this, char *target, bool *file)
{
	return this->file == *file && streq(this->target, target);
}

/**
 * Handle configured syslog identifier
 *
 * mutex must be locked when calling this function
 */
static void handle_syslog_identifier(private_daemon_t *this)
{
#ifdef HAVE_SYSLOG
	char *identifier;

	identifier = lib->settings->get_str(lib->settings, "%s.syslog.identifier",
										NULL, lib->ns);
	if (identifier)
	{	/* set identifier, which is prepended to each log line */
		if (!this->syslog_identifier ||
			!streq(identifier, this->syslog_identifier))
		{
			closelog();
			this->syslog_identifier = identifier;
			openlog(this->syslog_identifier, 0, 0);
		}
	}
	else if (this->syslog_identifier)
	{
		closelog();
		this->syslog_identifier = NULL;
	}
#endif /* HAVE_SYSLOG */
}

/**
 * Convert the given string into a syslog facility, returns -1 if the facility
 * is not supported
 */
static int get_syslog_facility(char *facility)
{
#ifdef HAVE_SYSLOG
	if (streq(facility, "daemon"))
	{
		return LOG_DAEMON;
	}
	else if (streq(facility, "auth"))
	{
		return LOG_AUTHPRIV;
	}
#endif /* HAVE_SYSLOG */
	return -1;
}

/**
 * Returns an existing or newly created logger entry (if found, it is removed
 * from the given linked list of existing loggers)
 */
static logger_entry_t *get_logger_entry(char *target, bool is_file_logger,
										linked_list_t *existing)
{
	logger_entry_t *entry;

	if (existing->find_first(existing, (void*)logger_entry_match,
							(void**)&entry, target, &is_file_logger) != SUCCESS)
	{
		INIT(entry,
			.target = strdup(target),
			.file = is_file_logger,
		);
		if (is_file_logger)
		{
			entry->logger.file = file_logger_create(target);
		}
#ifdef HAVE_SYSLOG
		else
		{
			entry->logger.sys = sys_logger_create(get_syslog_facility(target));
		}
#endif /* HAVE_SYSLOG */
	}
	else
	{
		existing->remove(existing, entry, NULL);
	}
	return entry;
}

/**
 * Create or reuse a syslog logger
 */
static sys_logger_t *add_sys_logger(private_daemon_t *this, char *facility,
									linked_list_t *current_loggers)
{
	logger_entry_t *entry;

	entry = get_logger_entry(facility, FALSE, current_loggers);
	this->loggers->insert_last(this->loggers, entry);
	return entry->logger.sys;
}

/**
 * Create or reuse a file logger
 */
static file_logger_t *add_file_logger(private_daemon_t *this, char *filename,
									  linked_list_t *current_loggers)
{
	logger_entry_t *entry;

	entry = get_logger_entry(filename, TRUE, current_loggers);
	this->loggers->insert_last(this->loggers, entry);
	return entry->logger.file;
}

/**
 * Load the given syslog logger configured in strongswan.conf
 */
static void load_sys_logger(private_daemon_t *this, char *facility,
							linked_list_t *current_loggers)
{
	sys_logger_t *sys_logger;
	debug_t group;
	level_t def;

	if (get_syslog_facility(facility) == -1)
	{
		return;
	}

	sys_logger = add_sys_logger(this, facility, current_loggers);
	sys_logger->set_options(sys_logger,
				lib->settings->get_bool(lib->settings, "%s.syslog.%s.ike_name",
										FALSE, lib->ns, facility));

	def = lib->settings->get_int(lib->settings, "%s.syslog.%s.default", 1,
								 lib->ns, facility);
	for (group = 0; group < DBG_MAX; group++)
	{
		sys_logger->set_level(sys_logger, group,
				lib->settings->get_int(lib->settings, "%s.syslog.%s.%N", def,
							lib->ns, facility, debug_lower_names, group));
	}
	charon->bus->add_logger(charon->bus, &sys_logger->logger);
}

/**
 * Load the given file logger configured in strongswan.conf
 */
static void load_file_logger(private_daemon_t *this, char *filename,
							 linked_list_t *current_loggers)
{
	file_logger_t *file_logger;
	debug_t group;
	level_t def;
	bool ike_name, flush_line, append;
	char *time_format;

	time_format = lib->settings->get_str(lib->settings,
						"%s.filelog.%s.time_format", NULL, lib->ns, filename);
	ike_name = lib->settings->get_bool(lib->settings,
						"%s.filelog.%s.ike_name", FALSE, lib->ns, filename);
	flush_line = lib->settings->get_bool(lib->settings,
						"%s.filelog.%s.flush_line", FALSE, lib->ns, filename);
	append = lib->settings->get_bool(lib->settings,
						"%s.filelog.%s.append", TRUE, lib->ns, filename);

	file_logger = add_file_logger(this, filename, current_loggers);
	file_logger->set_options(file_logger, time_format, ike_name);
	file_logger->open(file_logger, flush_line, append);

	def = lib->settings->get_int(lib->settings, "%s.filelog.%s.default", 1,
								 lib->ns, filename);
	for (group = 0; group < DBG_MAX; group++)
	{
		file_logger->set_level(file_logger, group,
				lib->settings->get_int(lib->settings, "%s.filelog.%s.%N", def,
							lib->ns, filename, debug_lower_names, group));
	}
	charon->bus->add_logger(charon->bus, &file_logger->logger);
}

METHOD(daemon_t, load_loggers, void,
	private_daemon_t *this, level_t levels[DBG_MAX], bool to_stderr)
{
	enumerator_t *enumerator;
	linked_list_t *current_loggers;
	char *target;

	this->mutex->lock(this->mutex);
	handle_syslog_identifier(this);
	current_loggers = this->loggers;
	this->loggers = linked_list_create();
	enumerator = lib->settings->create_section_enumerator(lib->settings,
														"%s.syslog", lib->ns);
	while (enumerator->enumerate(enumerator, &target))
	{
		load_sys_logger(this, target, current_loggers);
	}
	enumerator->destroy(enumerator);

	enumerator = lib->settings->create_section_enumerator(lib->settings,
														"%s.filelog", lib->ns);
	while (enumerator->enumerate(enumerator, &target))
	{
		load_file_logger(this, target, current_loggers);
	}
	enumerator->destroy(enumerator);

	if (!this->loggers->get_count(this->loggers) && levels)
	{	/* setup legacy style default loggers configured via command-line */
		file_logger_t *file_logger;
		sys_logger_t *sys_logger;
		debug_t group;

		sys_logger = add_sys_logger(this, "daemon", current_loggers);
		file_logger = add_file_logger(this, "stdout", current_loggers);
		file_logger->open(file_logger, FALSE, FALSE);

		for (group = 0; group < DBG_MAX; group++)
		{
			if (sys_logger)
			{
				sys_logger->set_level(sys_logger, group, levels[group]);
			}
			if (to_stderr)
			{
				file_logger->set_level(file_logger, group, levels[group]);
			}
		}
		if (sys_logger)
		{
			charon->bus->add_logger(charon->bus, &sys_logger->logger);
		}
		charon->bus->add_logger(charon->bus, &file_logger->logger);

		sys_logger = add_sys_logger(this, "auth", current_loggers);
		if (sys_logger)
		{
			sys_logger->set_level(sys_logger, DBG_ANY, LEVEL_AUDIT);
			charon->bus->add_logger(charon->bus, &sys_logger->logger);
		}
	}
	/* unregister and destroy any unused remaining loggers */
	current_loggers->destroy_function(current_loggers,
									 (void*)logger_entry_unregister_destroy);
	this->mutex->unlock(this->mutex);
}

METHOD(daemon_t, set_level, void,
	private_daemon_t *this, debug_t group, level_t level)
{
	enumerator_t *enumerator;
	logger_entry_t *entry;

	/* we set the loglevel on ALL sys- and file-loggers */
	this->mutex->lock(this->mutex);
	enumerator = this->loggers->create_enumerator(this->loggers);
	while (enumerator->enumerate(enumerator, &entry))
	{
		if (entry->file)
		{
			entry->logger.file->set_level(entry->logger.file, group, level);
			charon->bus->add_logger(charon->bus, &entry->logger.file->logger);
		}
		else
		{
			entry->logger.sys->set_level(entry->logger.sys, group, level);
			charon->bus->add_logger(charon->bus, &entry->logger.sys->logger);
		}
	}
	enumerator->destroy(enumerator);
	this->mutex->unlock(this->mutex);
}

/**
 * Clean up all daemon resources
 */
static void destroy(private_daemon_t *this)
{
	/* terminate all idle threads */
	lib->processor->set_threads(lib->processor, 0);
	/* make sure nobody waits for a DNS query */
	lib->hosts->flush(lib->hosts);
	/* close all IKE_SAs */
	if (this->public.ike_sa_manager)
	{
		this->public.ike_sa_manager->flush(this->public.ike_sa_manager);
	}
	if (this->public.traps)
	{
		this->public.traps->flush(this->public.traps);
	}
	if (this->public.sender)
	{
		this->public.sender->flush(this->public.sender);
	}

	/* cancel all threads and wait for their termination */
	lib->processor->cancel(lib->processor);

#ifdef ME
	DESTROY_IF(this->public.connect_manager);
	DESTROY_IF(this->public.mediation_manager);
#endif /* ME */
	/* make sure the cache and scheduler are clear before unloading plugins */
	lib->credmgr->flush_cache(lib->credmgr, CERT_ANY);
	lib->scheduler->flush(lib->scheduler);
	lib->plugins->unload(lib->plugins);
	DESTROY_IF(this->public.attributes);
	DESTROY_IF(this->kernel_handler);
	DESTROY_IF(this->public.traps);
	DESTROY_IF(this->public.shunts);
	DESTROY_IF(this->public.child_sa_manager);
	DESTROY_IF(this->public.ike_sa_manager);
	DESTROY_IF(this->public.controller);
	DESTROY_IF(this->public.eap);
	DESTROY_IF(this->public.xauth);
	DESTROY_IF(this->public.backends);
	DESTROY_IF(this->public.socket);

	/* rehook library logging, shutdown logging */
	dbg = dbg_old;
	DESTROY_IF(this->public.bus);
	this->loggers->destroy_function(this->loggers, (void*)logger_entry_destroy);
	this->mutex->destroy(this->mutex);
	free(this);
}

/**
 * Run a set of configured scripts
 */
static void run_scripts(private_daemon_t *this, char *verb)
{
	enumerator_t *enumerator;
	char *key, *value, *pos, buf[1024];
	FILE *cmd;

	enumerator = lib->settings->create_key_value_enumerator(lib->settings,
												"%s.%s-scripts", lib->ns, verb);
	while (enumerator->enumerate(enumerator, &key, &value))
	{
		DBG1(DBG_DMN, "executing %s script '%s' (%s):", verb, key, value);
		cmd = popen(value, "r");
		if (!cmd)
		{
			DBG1(DBG_DMN, "executing %s script '%s' (%s) failed: %s",
				 verb, key, value, strerror(errno));
			continue;
		}
		while (TRUE)
		{
			if (!fgets(buf, sizeof(buf), cmd))
			{
				if (ferror(cmd))
				{
					DBG1(DBG_DMN, "reading from %s script '%s' (%s) failed",
						 verb, key, value);
				}
				break;
			}
			else
			{
				pos = buf + strlen(buf);
				if (pos > buf && pos[-1] == '\n')
				{
					pos[-1] = '\0';
				}
				DBG1(DBG_DMN, "%s: %s", key, buf);
			}
		}
		pclose(cmd);
	}
	enumerator->destroy(enumerator);
}

METHOD(daemon_t, start, void,
	   private_daemon_t *this)
{
	/* start the engine, go multithreaded */
	lib->processor->set_threads(lib->processor,
						lib->settings->get_int(lib->settings, "%s.threads",
											   DEFAULT_THREADS, lib->ns));

	run_scripts(this, "start");
}


/**
 * Initialize/deinitialize sender and receiver
 */
static bool sender_receiver_cb(void *plugin, plugin_feature_t *feature,
							   bool reg, private_daemon_t *this)
{
	if (reg)
	{
		this->public.receiver = receiver_create();
		if (!this->public.receiver)
		{
			return FALSE;
		}
		this->public.sender = sender_create();
	}
	else
	{
		DESTROY_IF(this->public.receiver);
		DESTROY_IF(this->public.sender);
	}
	return TRUE;
}

METHOD(daemon_t, initialize, bool,
	private_daemon_t *this, char *plugins)
{
	plugin_feature_t features[] = {
		PLUGIN_PROVIDE(CUSTOM, "libcharon"),
			PLUGIN_DEPENDS(NONCE_GEN),
			PLUGIN_DEPENDS(CUSTOM, "libcharon-receiver"),
			PLUGIN_DEPENDS(CUSTOM, "kernel-ipsec"),
			PLUGIN_DEPENDS(CUSTOM, "kernel-net"),
		PLUGIN_CALLBACK((plugin_feature_callback_t)sender_receiver_cb, this),
			PLUGIN_PROVIDE(CUSTOM, "libcharon-receiver"),
				PLUGIN_DEPENDS(HASHER, HASH_SHA1),
				PLUGIN_DEPENDS(RNG, RNG_STRONG),
				PLUGIN_DEPENDS(CUSTOM, "socket"),
	};
	lib->plugins->add_static_features(lib->plugins, lib->ns, features,
									  countof(features), TRUE, NULL, NULL);

	/* load plugins, further infrastructure may need it */
	if (!lib->plugins->load(lib->plugins, plugins))
	{
		return FALSE;
	}

	this->public.ike_sa_manager = ike_sa_manager_create();
	if (this->public.ike_sa_manager == NULL)
	{
		return FALSE;
	}
	this->public.child_sa_manager = child_sa_manager_create();

	/* Queue start_action job */
	lib->processor->queue_job(lib->processor, (job_t*)start_action_job_create());

#ifdef ME
	this->public.connect_manager = connect_manager_create();
	if (this->public.connect_manager == NULL)
	{
		return FALSE;
	}
	this->public.mediation_manager = mediation_manager_create();
#endif /* ME */

	return TRUE;
}

/**
 * Create the daemon.
 */
private_daemon_t *daemon_create()
{
	private_daemon_t *this;

	INIT(this,
		.public = {
			.initialize = _initialize,
			.start = _start,
			.load_loggers = _load_loggers,
			.set_level = _set_level,
			.bus = bus_create(),
		},
		.loggers = linked_list_create(),
		.mutex = mutex_create(MUTEX_TYPE_DEFAULT),
		.ref = 1,
	);
	charon = &this->public;
	this->public.attributes = attribute_manager_create();
	this->public.controller = controller_create();
	this->public.eap = eap_manager_create();
	this->public.xauth = xauth_manager_create();
	this->public.backends = backend_manager_create();
	this->public.socket = socket_manager_create();
	this->public.traps = trap_manager_create();
	this->public.shunts = shunt_manager_create();
	this->kernel_handler = kernel_handler_create();

	return this;
}

/**
 * Described in header.
 */
void libcharon_deinit()
{
	private_daemon_t *this = (private_daemon_t*)charon;

	if (!this || !ref_put(&this->ref))
	{	/* have more users */
		return;
	}

	run_scripts(this, "stop");

	destroy(this);
	charon = NULL;
}

/**
 * Described in header.
 */
bool libcharon_init()
{
	private_daemon_t *this;

	if (charon)
	{	/* already initialized, increase refcount */
		this = (private_daemon_t*)charon;
		ref_get(&this->ref);
		return !this->integrity_failed;
	}

	this = daemon_create();

	/* for uncritical pseudo random numbers */
	srandom(time(NULL) + getpid());

	/* set up hook to log dbg message in library via charons message bus */
	dbg_old = dbg;
	dbg = dbg_bus;

	lib->printf_hook->add_handler(lib->printf_hook, 'P',
								  proposal_printf_hook,
								  PRINTF_HOOK_ARGTYPE_POINTER,
								  PRINTF_HOOK_ARGTYPE_END);

	if (lib->integrity &&
		!lib->integrity->check(lib->integrity, "libcharon", libcharon_init))
	{
		dbg(DBG_DMN, 1, "integrity check of libcharon failed");
		this->integrity_failed = TRUE;
	}
	return !this->integrity_failed;
}