Merge branch 'android-fixes'
[strongswan.git] / src / libcharon / sa / trap_manager.c
1 /*
2 * Copyright (C) 2011-2017 Tobias Brunner
3 * Copyright (C) 2009 Martin Willi
4 * HSR Hochschule fuer Technik Rapperswil
5 *
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License as published by the
8 * Free Software Foundation; either version 2 of the License, or (at your
9 * option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
10 *
11 * This program is distributed in the hope that it will be useful, but
12 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
13 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * for more details.
15 */
16
17 #include "trap_manager.h"
18
19 #include <daemon.h>
20 #include <threading/mutex.h>
21 #include <threading/rwlock.h>
22 #include <threading/rwlock_condvar.h>
23 #include <collections/linked_list.h>
24
25 #define INSTALL_DISABLED ((u_int)~0)
26
27 typedef struct private_trap_manager_t private_trap_manager_t;
28 typedef struct trap_listener_t trap_listener_t;
29
30 /**
31 * listener to track acquires
32 */
33 struct trap_listener_t {
34
35 /**
36 * Implements listener interface
37 */
38 listener_t listener;
39
40 /**
41 * points to trap_manager
42 */
43 private_trap_manager_t *traps;
44 };
45
46 /**
47 * Private data of an trap_manager_t object.
48 */
49 struct private_trap_manager_t {
50
51 /**
52 * Public trap_manager_t interface.
53 */
54 trap_manager_t public;
55
56 /**
57 * Installed traps, as entry_t
58 */
59 linked_list_t *traps;
60
61 /**
62 * read write lock for traps list
63 */
64 rwlock_t *lock;
65
66 /**
67 * listener to track acquiring IKE_SAs
68 */
69 trap_listener_t listener;
70
71 /**
72 * list of acquires we currently handle
73 */
74 linked_list_t *acquires;
75
76 /**
77 * mutex for list of acquires
78 */
79 mutex_t *mutex;
80
81 /**
82 * number of threads currently installing trap policies, or INSTALL_DISABLED
83 */
84 u_int installing;
85
86 /**
87 * condvar to signal trap policy installation
88 */
89 rwlock_condvar_t *condvar;
90
91 /**
92 * Whether to ignore traffic selectors from acquires
93 */
94 bool ignore_acquire_ts;
95 };
96
97 /**
98 * A installed trap entry
99 */
100 typedef struct {
101 /** name of the trapped CHILD_SA */
102 char *name;
103 /** ref to peer_cfg to initiate */
104 peer_cfg_t *peer_cfg;
105 /** ref to instantiated CHILD_SA (i.e the trap policy) */
106 child_sa_t *child_sa;
107 /** TRUE in case of wildcard Transport Mode SA */
108 bool wildcard;
109 } entry_t;
110
111 /**
112 * A handled acquire
113 */
114 typedef struct {
115 /** pending IKE_SA connecting upon acquire */
116 ike_sa_t *ike_sa;
117 /** reqid of pending trap policy */
118 uint32_t reqid;
119 /** destination address (wildcard case) */
120 host_t *dst;
121 } acquire_t;
122
123 /**
124 * actually uninstall and destroy an installed entry
125 */
126 static void destroy_entry(entry_t *this)
127 {
128 this->child_sa->destroy(this->child_sa);
129 this->peer_cfg->destroy(this->peer_cfg);
130 free(this->name);
131 free(this);
132 }
133
134 /**
135 * destroy a cached acquire entry
136 */
137 static void destroy_acquire(acquire_t *this)
138 {
139 DESTROY_IF(this->dst);
140 free(this);
141 }
142
143 CALLBACK(acquire_by_reqid, bool,
144 acquire_t *this, va_list args)
145 {
146 uint32_t reqid;
147
148 VA_ARGS_VGET(args, reqid);
149 return this->reqid == reqid;
150 }
151
152 CALLBACK(acquire_by_dst, bool,
153 acquire_t *this, va_list args)
154 {
155 host_t *dst;
156
157 VA_ARGS_VGET(args, dst);
158 return this->dst && this->dst->ip_equals(this->dst, dst);
159 }
160
161 /**
162 * Check if any remote TS are dynamic
163 */
164 static bool dynamic_remote_ts(child_cfg_t *child)
165 {
166 enumerator_t *enumerator;
167 linked_list_t *other_ts;
168 traffic_selector_t *ts;
169 bool found = FALSE;
170
171 other_ts = child->get_traffic_selectors(child, FALSE, NULL, NULL, FALSE);
172 enumerator = other_ts->create_enumerator(other_ts);
173 while (enumerator->enumerate(enumerator, &ts))
174 {
175 if (ts->is_dynamic(ts))
176 {
177 found = TRUE;
178 break;
179 }
180 }
181 enumerator->destroy(enumerator);
182 other_ts->destroy_offset(other_ts, offsetof(traffic_selector_t, destroy));
183 return found;
184 }
185
186 METHOD(trap_manager_t, install, bool,
187 private_trap_manager_t *this, peer_cfg_t *peer, child_cfg_t *child)
188 {
189 entry_t *entry, *found = NULL;
190 ike_cfg_t *ike_cfg;
191 child_sa_t *child_sa;
192 host_t *me, *other;
193 linked_list_t *my_ts, *other_ts, *list;
194 enumerator_t *enumerator;
195 status_t status;
196 linked_list_t *proposals;
197 proposal_t *proposal;
198 protocol_id_t proto = PROTO_ESP;
199 bool result = FALSE, wildcard = FALSE;
200
201 /* try to resolve addresses */
202 ike_cfg = peer->get_ike_cfg(peer);
203 other = ike_cfg->resolve_other(ike_cfg, AF_UNSPEC);
204 if (other && other->is_anyaddr(other) &&
205 child->get_mode(child) == MODE_TRANSPORT)
206 {
207 /* allow wildcard for Transport Mode SAs */
208 me = host_create_any(other->get_family(other));
209 wildcard = TRUE;
210 }
211 else if (other && other->is_anyaddr(other))
212 {
213 other->destroy(other);
214 DBG1(DBG_CFG, "installing trap failed, remote address unknown");
215 return FALSE;
216 }
217 else
218 { /* depending on the traffic selectors we don't really need a remote
219 * host yet, but we might fail later if no IP can be resolved */
220 if (!other && dynamic_remote_ts(child))
221 { /* with dynamic TS we do need a host, otherwise 0.0.0.0/0 is used,
222 * which is probably not what users expect*/
223 DBG1(DBG_CFG, "installing trap failed, remote address unknown with "
224 "dynamic traffic selector");
225 return FALSE;
226 }
227 me = ike_cfg->resolve_me(ike_cfg, other ? other->get_family(other)
228 : AF_UNSPEC);
229 if (!other)
230 {
231 other = host_create_any(me ? me->get_family(me) : AF_INET);
232 }
233 other->set_port(other, ike_cfg->get_other_port(ike_cfg));
234 if ((!me || me->is_anyaddr(me)) && !other->is_anyaddr(other))
235 {
236 DESTROY_IF(me);
237 me = charon->kernel->get_source_addr(charon->kernel, other, NULL);
238 }
239 if (!me)
240 {
241 me = host_create_any(other->get_family(other));
242 }
243 me->set_port(me, ike_cfg->get_my_port(ike_cfg));
244 }
245
246 this->lock->write_lock(this->lock);
247 if (this->installing == INSTALL_DISABLED)
248 { /* flush() has been called */
249 this->lock->unlock(this->lock);
250 other->destroy(other);
251 me->destroy(me);
252 return FALSE;
253 }
254 enumerator = this->traps->create_enumerator(this->traps);
255 while (enumerator->enumerate(enumerator, &entry))
256 {
257 if (streq(entry->name, child->get_name(child)) &&
258 streq(entry->peer_cfg->get_name(entry->peer_cfg),
259 peer->get_name(peer)))
260 {
261 found = entry;
262 if (entry->child_sa)
263 { /* replace it with an updated version, if already installed */
264 this->traps->remove_at(this->traps, enumerator);
265 }
266 break;
267 }
268 }
269 enumerator->destroy(enumerator);
270
271 if (found)
272 {
273 if (!found->child_sa)
274 {
275 DBG1(DBG_CFG, "CHILD_SA '%s' is already being routed", found->name);
276 this->lock->unlock(this->lock);
277 other->destroy(other);
278 me->destroy(me);
279 return FALSE;
280 }
281 /* config might have changed so update everything */
282 DBG1(DBG_CFG, "updating already routed CHILD_SA '%s'", found->name);
283 }
284
285 INIT(entry,
286 .name = strdup(child->get_name(child)),
287 .peer_cfg = peer->get_ref(peer),
288 .wildcard = wildcard,
289 );
290 this->traps->insert_first(this->traps, entry);
291 this->installing++;
292 /* don't hold lock while creating CHILD_SA and installing policies */
293 this->lock->unlock(this->lock);
294
295 /* create and route CHILD_SA */
296 child_sa_create_t child_data = {
297 /* TODO: no reason to allocate unique interface IDs, there is currently
298 * no event to use them upon trap installation and we'd also have to
299 * pass them in a later initiate() call */
300 .if_id_in_def = peer->get_if_id(peer, TRUE),
301 .if_id_out_def = peer->get_if_id(peer, FALSE),
302 };
303 child_sa = child_sa_create(me, other, child, &child_data);
304
305 list = linked_list_create_with_items(me, NULL);
306 my_ts = child->get_traffic_selectors(child, TRUE, NULL, list, FALSE);
307 list->destroy_offset(list, offsetof(host_t, destroy));
308
309 list = linked_list_create_with_items(other, NULL);
310 other_ts = child->get_traffic_selectors(child, FALSE, NULL, list, FALSE);
311 list->destroy_offset(list, offsetof(host_t, destroy));
312
313 /* We don't know the finally negotiated protocol (ESP|AH), we install
314 * the SA with the protocol of the first proposal */
315 proposals = child->get_proposals(child, TRUE);
316 if (proposals->get_first(proposals, (void**)&proposal) == SUCCESS)
317 {
318 proto = proposal->get_protocol(proposal);
319 }
320 proposals->destroy_offset(proposals, offsetof(proposal_t, destroy));
321 child_sa->set_protocol(child_sa, proto);
322 child_sa->set_mode(child_sa, child->get_mode(child));
323 child_sa->set_policies(child_sa, my_ts, other_ts);
324 status = child_sa->install_policies(child_sa);
325 my_ts->destroy_offset(my_ts, offsetof(traffic_selector_t, destroy));
326 other_ts->destroy_offset(other_ts, offsetof(traffic_selector_t, destroy));
327 if (status != SUCCESS)
328 {
329 DBG1(DBG_CFG, "installing trap failed");
330 this->lock->write_lock(this->lock);
331 this->traps->remove(this->traps, entry, NULL);
332 this->lock->unlock(this->lock);
333 entry->child_sa = child_sa;
334 destroy_entry(entry);
335 }
336 else
337 {
338 this->lock->write_lock(this->lock);
339 entry->child_sa = child_sa;
340 this->lock->unlock(this->lock);
341 result = TRUE;
342 }
343 if (found)
344 {
345 destroy_entry(found);
346 }
347 this->lock->write_lock(this->lock);
348 /* do this at the end, so entries created temporarily are also destroyed */
349 this->installing--;
350 this->condvar->signal(this->condvar);
351 this->lock->unlock(this->lock);
352 return result;
353 }
354
355 METHOD(trap_manager_t, uninstall, bool,
356 private_trap_manager_t *this, char *peer, char *child)
357 {
358 enumerator_t *enumerator;
359 entry_t *entry, *found = NULL;
360
361 this->lock->write_lock(this->lock);
362 while (this->installing)
363 {
364 this->condvar->wait(this->condvar, this->lock);
365 }
366 enumerator = this->traps->create_enumerator(this->traps);
367 while (enumerator->enumerate(enumerator, &entry))
368 {
369 if (streq(entry->name, child) &&
370 (!peer || streq(peer, entry->peer_cfg->get_name(entry->peer_cfg))))
371 {
372 this->traps->remove_at(this->traps, enumerator);
373 found = entry;
374 break;
375 }
376 }
377 enumerator->destroy(enumerator);
378 this->lock->unlock(this->lock);
379
380 if (!found)
381 {
382 return FALSE;
383 }
384 destroy_entry(found);
385 return TRUE;
386 }
387
388 CALLBACK(trap_filter, bool,
389 rwlock_t *lock, enumerator_t *orig, va_list args)
390 {
391 entry_t *entry;
392 peer_cfg_t **peer_cfg;
393 child_sa_t **child_sa;
394
395 VA_ARGS_VGET(args, peer_cfg, child_sa);
396
397 while (orig->enumerate(orig, &entry))
398 {
399 if (!entry->child_sa)
400 { /* skip entries that are currently being installed */
401 continue;
402 }
403 if (peer_cfg)
404 {
405 *peer_cfg = entry->peer_cfg;
406 }
407 if (child_sa)
408 {
409 *child_sa = entry->child_sa;
410 }
411 return TRUE;
412 }
413 return FALSE;
414 }
415
416 METHOD(trap_manager_t, create_enumerator, enumerator_t*,
417 private_trap_manager_t *this)
418 {
419 this->lock->read_lock(this->lock);
420 return enumerator_create_filter(this->traps->create_enumerator(this->traps),
421 trap_filter, this->lock,
422 (void*)this->lock->unlock);
423 }
424
425 METHOD(trap_manager_t, acquire, void,
426 private_trap_manager_t *this, uint32_t reqid,
427 traffic_selector_t *src, traffic_selector_t *dst)
428 {
429 enumerator_t *enumerator;
430 entry_t *entry, *found = NULL;
431 acquire_t *acquire;
432 peer_cfg_t *peer;
433 child_cfg_t *child;
434 ike_sa_t *ike_sa;
435 host_t *host;
436 bool wildcard, ignore = FALSE;
437
438 this->lock->read_lock(this->lock);
439 enumerator = this->traps->create_enumerator(this->traps);
440 while (enumerator->enumerate(enumerator, &entry))
441 {
442 if (entry->child_sa &&
443 entry->child_sa->get_reqid(entry->child_sa) == reqid)
444 {
445 found = entry;
446 break;
447 }
448 }
449 enumerator->destroy(enumerator);
450
451 if (!found)
452 {
453 DBG1(DBG_CFG, "trap not found, unable to acquire reqid %d", reqid);
454 this->lock->unlock(this->lock);
455 return;
456 }
457 reqid = found->child_sa->get_reqid(found->child_sa);
458 wildcard = found->wildcard;
459
460 this->mutex->lock(this->mutex);
461 if (wildcard)
462 { /* for wildcard acquires we check that we don't have a pending acquire
463 * with the same peer */
464 uint8_t mask;
465
466 dst->to_subnet(dst, &host, &mask);
467 if (this->acquires->find_first(this->acquires, acquire_by_dst,
468 (void**)&acquire, host))
469 {
470 host->destroy(host);
471 ignore = TRUE;
472 }
473 else
474 {
475 INIT(acquire,
476 .dst = host,
477 .reqid = reqid,
478 );
479 this->acquires->insert_last(this->acquires, acquire);
480 }
481 }
482 else
483 {
484 if (this->acquires->find_first(this->acquires, acquire_by_reqid,
485 (void**)&acquire, reqid))
486 {
487 ignore = TRUE;
488 }
489 else
490 {
491 INIT(acquire,
492 .reqid = reqid,
493 );
494 this->acquires->insert_last(this->acquires, acquire);
495 }
496 }
497 this->mutex->unlock(this->mutex);
498 if (ignore)
499 {
500 DBG1(DBG_CFG, "ignoring acquire, connection attempt pending");
501 this->lock->unlock(this->lock);
502 return;
503 }
504 peer = found->peer_cfg->get_ref(found->peer_cfg);
505 child = found->child_sa->get_config(found->child_sa);
506 child = child->get_ref(child);
507 /* don't hold the lock while checking out the IKE_SA */
508 this->lock->unlock(this->lock);
509
510 if (wildcard)
511 { /* the peer config would match IKE_SAs with other peers */
512 ike_sa = charon->ike_sa_manager->checkout_new(charon->ike_sa_manager,
513 peer->get_ike_version(peer), TRUE);
514 if (ike_sa)
515 {
516 ike_cfg_t *ike_cfg;
517 uint16_t port;
518 uint8_t mask;
519
520 ike_sa->set_peer_cfg(ike_sa, peer);
521 ike_cfg = ike_sa->get_ike_cfg(ike_sa);
522
523 port = ike_cfg->get_other_port(ike_cfg);
524 dst->to_subnet(dst, &host, &mask);
525 host->set_port(host, port);
526 ike_sa->set_other_host(ike_sa, host);
527
528 port = ike_cfg->get_my_port(ike_cfg);
529 src->to_subnet(src, &host, &mask);
530 host->set_port(host, port);
531 ike_sa->set_my_host(ike_sa, host);
532
533 charon->bus->set_sa(charon->bus, ike_sa);
534 }
535 }
536 else
537 {
538 ike_sa = charon->ike_sa_manager->checkout_by_config(
539 charon->ike_sa_manager, peer);
540 }
541 if (ike_sa)
542 {
543 if (ike_sa->get_peer_cfg(ike_sa) == NULL)
544 {
545 ike_sa->set_peer_cfg(ike_sa, peer);
546 }
547 if (this->ignore_acquire_ts || ike_sa->get_version(ike_sa) == IKEV1)
548 { /* in IKEv1, don't prepend the acquiring packet TS, as we only
549 * have a single TS that we can establish in a Quick Mode. */
550 src = dst = NULL;
551 }
552
553 this->mutex->lock(this->mutex);
554 acquire->ike_sa = ike_sa;
555 this->mutex->unlock(this->mutex);
556
557 if (ike_sa->initiate(ike_sa, child, reqid, src, dst) != DESTROY_ME)
558 {
559 charon->ike_sa_manager->checkin(charon->ike_sa_manager, ike_sa);
560 }
561 else
562 {
563 charon->ike_sa_manager->checkin_and_destroy(charon->ike_sa_manager,
564 ike_sa);
565 }
566 }
567 else
568 {
569 this->mutex->lock(this->mutex);
570 this->acquires->remove(this->acquires, acquire, NULL);
571 this->mutex->unlock(this->mutex);
572 destroy_acquire(acquire);
573 child->destroy(child);
574 }
575 peer->destroy(peer);
576 }
577
578 /**
579 * Complete the acquire, if successful or failed
580 */
581 static void complete(private_trap_manager_t *this, ike_sa_t *ike_sa,
582 child_sa_t *child_sa)
583 {
584 enumerator_t *enumerator;
585 acquire_t *acquire;
586
587 this->mutex->lock(this->mutex);
588 enumerator = this->acquires->create_enumerator(this->acquires);
589 while (enumerator->enumerate(enumerator, &acquire))
590 {
591 if (!acquire->ike_sa || acquire->ike_sa != ike_sa)
592 {
593 continue;
594 }
595 if (child_sa)
596 {
597 if (acquire->dst)
598 {
599 /* since every wildcard acquire results in a separate IKE_SA
600 * there is no need to compare the destination address */
601 }
602 else if (child_sa->get_reqid(child_sa) != acquire->reqid)
603 {
604 continue;
605 }
606 }
607 this->acquires->remove_at(this->acquires, enumerator);
608 destroy_acquire(acquire);
609 }
610 enumerator->destroy(enumerator);
611 this->mutex->unlock(this->mutex);
612 }
613
614 METHOD(listener_t, ike_state_change, bool,
615 trap_listener_t *listener, ike_sa_t *ike_sa, ike_sa_state_t state)
616 {
617 switch (state)
618 {
619 case IKE_DESTROYING:
620 complete(listener->traps, ike_sa, NULL);
621 return TRUE;
622 default:
623 return TRUE;
624 }
625 }
626
627 METHOD(listener_t, child_state_change, bool,
628 trap_listener_t *listener, ike_sa_t *ike_sa, child_sa_t *child_sa,
629 child_sa_state_t state)
630 {
631 switch (state)
632 {
633 case CHILD_INSTALLED:
634 case CHILD_DESTROYING:
635 complete(listener->traps, ike_sa, child_sa);
636 return TRUE;
637 default:
638 return TRUE;
639 }
640 }
641
642 METHOD(trap_manager_t, flush, void,
643 private_trap_manager_t *this)
644 {
645 this->lock->write_lock(this->lock);
646 while (this->installing)
647 {
648 this->condvar->wait(this->condvar, this->lock);
649 }
650 this->traps->destroy_function(this->traps, (void*)destroy_entry);
651 this->traps = linked_list_create();
652 this->installing = INSTALL_DISABLED;
653 this->lock->unlock(this->lock);
654 }
655
656 METHOD(trap_manager_t, destroy, void,
657 private_trap_manager_t *this)
658 {
659 charon->bus->remove_listener(charon->bus, &this->listener.listener);
660 this->traps->destroy_function(this->traps, (void*)destroy_entry);
661 this->acquires->destroy_function(this->acquires, (void*)destroy_acquire);
662 this->condvar->destroy(this->condvar);
663 this->mutex->destroy(this->mutex);
664 this->lock->destroy(this->lock);
665 free(this);
666 }
667
668 /**
669 * See header
670 */
671 trap_manager_t *trap_manager_create(void)
672 {
673 private_trap_manager_t *this;
674
675 INIT(this,
676 .public = {
677 .install = _install,
678 .uninstall = _uninstall,
679 .create_enumerator = _create_enumerator,
680 .acquire = _acquire,
681 .flush = _flush,
682 .destroy = _destroy,
683 },
684 .listener = {
685 .traps = this,
686 .listener = {
687 .ike_state_change = _ike_state_change,
688 .child_state_change = _child_state_change,
689 },
690 },
691 .traps = linked_list_create(),
692 .acquires = linked_list_create(),
693 .mutex = mutex_create(MUTEX_TYPE_DEFAULT),
694 .lock = rwlock_create(RWLOCK_TYPE_DEFAULT),
695 .condvar = rwlock_condvar_create(),
696 .ignore_acquire_ts = lib->settings->get_bool(lib->settings,
697 "%s.ignore_acquire_ts", FALSE, lib->ns),
698 );
699 charon->bus->add_listener(charon->bus, &this->listener.listener);
700
701 return &this->public;
702 }