child-sa: Remove state to track installation of half the SA again
[strongswan.git] / src / libcharon / sa / ikev2 / tasks / child_create.c
1 /*
2 * Copyright (C) 2008-2017 Tobias Brunner
3 * Copyright (C) 2005-2008 Martin Willi
4 * Copyright (C) 2005 Jan Hutter
5 * HSR Hochschule fuer Technik Rapperswil
6 *
7 * This program is free software; you can redistribute it and/or modify it
8 * under the terms of the GNU General Public License as published by the
9 * Free Software Foundation; either version 2 of the License, or (at your
10 * option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
11 *
12 * This program is distributed in the hope that it will be useful, but
13 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
14 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
15 * for more details.
16 */
17
18 #include "child_create.h"
19
20 #include <daemon.h>
21 #include <sa/ikev2/keymat_v2.h>
22 #include <crypto/diffie_hellman.h>
23 #include <credentials/certificates/x509.h>
24 #include <encoding/payloads/sa_payload.h>
25 #include <encoding/payloads/ke_payload.h>
26 #include <encoding/payloads/ts_payload.h>
27 #include <encoding/payloads/nonce_payload.h>
28 #include <encoding/payloads/notify_payload.h>
29 #include <encoding/payloads/delete_payload.h>
30 #include <processing/jobs/delete_ike_sa_job.h>
31 #include <processing/jobs/inactivity_job.h>
32 #include <processing/jobs/initiate_tasks_job.h>
33
34 typedef struct private_child_create_t private_child_create_t;
35
36 /**
37 * Private members of a child_create_t task.
38 */
39 struct private_child_create_t {
40
41 /**
42 * Public methods and task_t interface.
43 */
44 child_create_t public;
45
46 /**
47 * Assigned IKE_SA.
48 */
49 ike_sa_t *ike_sa;
50
51 /**
52 * Are we the initiator?
53 */
54 bool initiator;
55
56 /**
57 * nonce chosen by us
58 */
59 chunk_t my_nonce;
60
61 /**
62 * nonce chosen by peer
63 */
64 chunk_t other_nonce;
65
66 /**
67 * nonce generator
68 */
69 nonce_gen_t *nonceg;
70
71 /**
72 * config to create the CHILD_SA from
73 */
74 child_cfg_t *config;
75
76 /**
77 * list of proposal candidates
78 */
79 linked_list_t *proposals;
80
81 /**
82 * selected proposal to use for CHILD_SA
83 */
84 proposal_t *proposal;
85
86 /**
87 * traffic selectors for initiators side
88 */
89 linked_list_t *tsi;
90
91 /**
92 * traffic selectors for responders side
93 */
94 linked_list_t *tsr;
95
96 /**
97 * source of triggering packet
98 */
99 traffic_selector_t *packet_tsi;
100
101 /**
102 * destination of triggering packet
103 */
104 traffic_selector_t *packet_tsr;
105
106 /**
107 * optional diffie hellman exchange
108 */
109 diffie_hellman_t *dh;
110
111 /**
112 * Applying DH public value failed?
113 */
114 bool dh_failed;
115
116 /**
117 * group used for DH exchange
118 */
119 diffie_hellman_group_t dh_group;
120
121 /**
122 * IKE_SAs keymat
123 */
124 keymat_v2_t *keymat;
125
126 /**
127 * mode the new CHILD_SA uses (transport/tunnel/beet)
128 */
129 ipsec_mode_t mode;
130
131 /**
132 * peer accepts TFC padding for this SA
133 */
134 bool tfcv3;
135
136 /**
137 * IPComp transform to use
138 */
139 ipcomp_transform_t ipcomp;
140
141 /**
142 * IPComp transform proposed or accepted by the other peer
143 */
144 ipcomp_transform_t ipcomp_received;
145
146 /**
147 * IPsec protocol
148 */
149 protocol_id_t proto;
150
151 /**
152 * Own allocated SPI
153 */
154 uint32_t my_spi;
155
156 /**
157 * SPI received in proposal
158 */
159 uint32_t other_spi;
160
161 /**
162 * Own allocated Compression Parameter Index (CPI)
163 */
164 uint16_t my_cpi;
165
166 /**
167 * Other Compression Parameter Index (CPI), received via IPCOMP_SUPPORTED
168 */
169 uint16_t other_cpi;
170
171 /**
172 * reqid to use if we are rekeying
173 */
174 uint32_t reqid;
175
176 /**
177 * Explicit inbound mark value
178 */
179 u_int mark_in;
180
181 /**
182 * Explicit outbound mark value
183 */
184 u_int mark_out;
185
186 /**
187 * CHILD_SA which gets established
188 */
189 child_sa_t *child_sa;
190
191 /**
192 * successfully established the CHILD?
193 */
194 bool established;
195
196 /**
197 * whether the CHILD_SA rekeys an existing one
198 */
199 bool rekey;
200
201 /**
202 * whether we are retrying with another DH group
203 */
204 bool retry;
205 };
206
207 /**
208 * Schedule a retry if creating the CHILD_SA temporary failed
209 */
210 static void schedule_delayed_retry(private_child_create_t *this)
211 {
212 child_create_t *task;
213 uint32_t retry;
214
215 retry = RETRY_INTERVAL - (random() % RETRY_JITTER);
216
217 task = child_create_create(this->ike_sa,
218 this->config->get_ref(this->config), FALSE,
219 this->packet_tsi, this->packet_tsr);
220 task->use_reqid(task, this->reqid);
221 DBG1(DBG_IKE, "creating CHILD_SA failed, trying again in %d seconds",
222 retry);
223 this->ike_sa->queue_task_delayed(this->ike_sa, (task_t*)task, retry);
224 }
225
226 /**
227 * get the nonce from a message
228 */
229 static status_t get_nonce(message_t *message, chunk_t *nonce)
230 {
231 nonce_payload_t *payload;
232
233 payload = (nonce_payload_t*)message->get_payload(message, PLV2_NONCE);
234 if (payload == NULL)
235 {
236 return FAILED;
237 }
238 *nonce = payload->get_nonce(payload);
239 return NEED_MORE;
240 }
241
242 /**
243 * generate a new nonce to include in a CREATE_CHILD_SA message
244 */
245 static bool generate_nonce(private_child_create_t *this)
246 {
247 this->nonceg = this->keymat->keymat.create_nonce_gen(&this->keymat->keymat);
248 if (!this->nonceg)
249 {
250 DBG1(DBG_IKE, "no nonce generator found to create nonce");
251 return FALSE;
252 }
253 if (!this->nonceg->allocate_nonce(this->nonceg, NONCE_SIZE,
254 &this->my_nonce))
255 {
256 DBG1(DBG_IKE, "nonce allocation failed");
257 return FALSE;
258 }
259 return TRUE;
260 }
261
262 /**
263 * Check a list of traffic selectors if any selector belongs to host
264 */
265 static bool ts_list_is_host(linked_list_t *list, host_t *host)
266 {
267 traffic_selector_t *ts;
268 bool is_host = TRUE;
269 enumerator_t *enumerator = list->create_enumerator(list);
270
271 while (is_host && enumerator->enumerate(enumerator, (void**)&ts))
272 {
273 is_host = is_host && ts->is_host(ts, host);
274 }
275 enumerator->destroy(enumerator);
276 return is_host;
277 }
278
279 /**
280 * Allocate SPIs and update proposals
281 */
282 static bool allocate_spi(private_child_create_t *this)
283 {
284 enumerator_t *enumerator;
285 proposal_t *proposal;
286
287 if (this->initiator)
288 {
289 this->proto = PROTO_ESP;
290 /* we just get a SPI for the first protocol. TODO: If we ever support
291 * proposal lists with mixed protocols, we'd need multiple SPIs */
292 if (this->proposals->get_first(this->proposals,
293 (void**)&proposal) == SUCCESS)
294 {
295 this->proto = proposal->get_protocol(proposal);
296 }
297 }
298 else
299 {
300 this->proto = this->proposal->get_protocol(this->proposal);
301 }
302 this->my_spi = this->child_sa->alloc_spi(this->child_sa, this->proto);
303 if (this->my_spi)
304 {
305 if (this->initiator)
306 {
307 enumerator = this->proposals->create_enumerator(this->proposals);
308 while (enumerator->enumerate(enumerator, &proposal))
309 {
310 proposal->set_spi(proposal, this->my_spi);
311 }
312 enumerator->destroy(enumerator);
313 }
314 else
315 {
316 this->proposal->set_spi(this->proposal, this->my_spi);
317 }
318 return TRUE;
319 }
320 return FALSE;
321 }
322
323 /**
324 * Schedule inactivity timeout for CHILD_SA with reqid, if enabled
325 */
326 static void schedule_inactivity_timeout(private_child_create_t *this)
327 {
328 uint32_t timeout, id;
329 bool close_ike;
330
331 timeout = this->config->get_inactivity(this->config);
332 if (timeout)
333 {
334 close_ike = lib->settings->get_bool(lib->settings,
335 "%s.inactivity_close_ike", FALSE, lib->ns);
336 id = this->child_sa->get_unique_id(this->child_sa);
337 lib->scheduler->schedule_job(lib->scheduler, (job_t*)
338 inactivity_job_create(id, timeout, close_ike), timeout);
339 }
340 }
341
342 /**
343 * Check if we have a an address pool configured
344 */
345 static bool have_pool(ike_sa_t *ike_sa)
346 {
347 enumerator_t *enumerator;
348 peer_cfg_t *peer_cfg;
349 char *pool;
350 bool found = FALSE;
351
352 peer_cfg = ike_sa->get_peer_cfg(ike_sa);
353 if (peer_cfg)
354 {
355 enumerator = peer_cfg->create_pool_enumerator(peer_cfg);
356 if (enumerator->enumerate(enumerator, &pool))
357 {
358 found = TRUE;
359 }
360 enumerator->destroy(enumerator);
361 }
362 return found;
363 }
364
365 /**
366 * Get hosts to use for dynamic traffic selectors
367 */
368 static linked_list_t *get_dynamic_hosts(ike_sa_t *ike_sa, bool local)
369 {
370 enumerator_t *enumerator;
371 linked_list_t *list;
372 host_t *host;
373
374 list = linked_list_create();
375 enumerator = ike_sa->create_virtual_ip_enumerator(ike_sa, local);
376 while (enumerator->enumerate(enumerator, &host))
377 {
378 list->insert_last(list, host);
379 }
380 enumerator->destroy(enumerator);
381
382 if (list->get_count(list) == 0)
383 { /* no virtual IPs assigned */
384 if (local)
385 {
386 host = ike_sa->get_my_host(ike_sa);
387 list->insert_last(list, host);
388 }
389 else if (!have_pool(ike_sa))
390 { /* use host only if we don't have a pool configured */
391 host = ike_sa->get_other_host(ike_sa);
392 list->insert_last(list, host);
393 }
394 }
395 return list;
396 }
397
398 /**
399 * Substitude any host address with NATed address in traffic selector
400 */
401 static linked_list_t* get_transport_nat_ts(private_child_create_t *this,
402 bool local, linked_list_t *in)
403 {
404 enumerator_t *enumerator;
405 linked_list_t *out;
406 traffic_selector_t *ts;
407 host_t *ike, *first = NULL;
408 uint8_t mask;
409
410 if (local)
411 {
412 ike = this->ike_sa->get_my_host(this->ike_sa);
413 }
414 else
415 {
416 ike = this->ike_sa->get_other_host(this->ike_sa);
417 }
418
419 out = linked_list_create();
420
421 enumerator = in->create_enumerator(in);
422 while (enumerator->enumerate(enumerator, &ts))
423 {
424 /* require that all selectors match the first "host" selector */
425 if (ts->is_host(ts, first))
426 {
427 if (!first)
428 {
429 ts->to_subnet(ts, &first, &mask);
430 }
431 ts = ts->clone(ts);
432 ts->set_address(ts, ike);
433 out->insert_last(out, ts);
434 }
435 }
436 enumerator->destroy(enumerator);
437 DESTROY_IF(first);
438
439 return out;
440 }
441
442 /**
443 * Narrow received traffic selectors with configuration
444 */
445 static linked_list_t* narrow_ts(private_child_create_t *this, bool local,
446 linked_list_t *in)
447 {
448 linked_list_t *hosts, *nat, *ts;
449 ike_condition_t cond;
450
451 cond = local ? COND_NAT_HERE : COND_NAT_THERE;
452 hosts = get_dynamic_hosts(this->ike_sa, local);
453
454 if (this->mode == MODE_TRANSPORT &&
455 this->ike_sa->has_condition(this->ike_sa, cond))
456 {
457 nat = get_transport_nat_ts(this, local, in);
458 ts = this->config->get_traffic_selectors(this->config, local, nat, hosts);
459 nat->destroy_offset(nat, offsetof(traffic_selector_t, destroy));
460 }
461 else
462 {
463 ts = this->config->get_traffic_selectors(this->config, local, in, hosts);
464 }
465
466 hosts->destroy(hosts);
467
468 return ts;
469 }
470
471 /**
472 * Install a CHILD_SA for usage, return value:
473 * - FAILED: no acceptable proposal
474 * - INVALID_ARG: diffie hellman group inacceptable
475 * - NOT_FOUND: TS inacceptable
476 */
477 static status_t select_and_install(private_child_create_t *this,
478 bool no_dh, bool ike_auth)
479 {
480 status_t status, status_i, status_o;
481 chunk_t nonce_i, nonce_r;
482 chunk_t encr_i = chunk_empty, encr_r = chunk_empty;
483 chunk_t integ_i = chunk_empty, integ_r = chunk_empty;
484 linked_list_t *my_ts, *other_ts;
485 host_t *me, *other;
486 bool private, prefer_configured;
487
488 if (this->proposals == NULL)
489 {
490 DBG1(DBG_IKE, "SA payload missing in message");
491 return FAILED;
492 }
493 if (this->tsi == NULL || this->tsr == NULL)
494 {
495 DBG1(DBG_IKE, "TS payloads missing in message");
496 return NOT_FOUND;
497 }
498
499 me = this->ike_sa->get_my_host(this->ike_sa);
500 other = this->ike_sa->get_other_host(this->ike_sa);
501
502 private = this->ike_sa->supports_extension(this->ike_sa, EXT_STRONGSWAN);
503 prefer_configured = lib->settings->get_bool(lib->settings,
504 "%s.prefer_configured_proposals", TRUE, lib->ns);
505 this->proposal = this->config->select_proposal(this->config,
506 this->proposals, no_dh, private, prefer_configured);
507 if (this->proposal == NULL)
508 {
509 DBG1(DBG_IKE, "no acceptable proposal found");
510 charon->bus->alert(charon->bus, ALERT_PROPOSAL_MISMATCH_CHILD,
511 this->proposals);
512 return FAILED;
513 }
514 this->other_spi = this->proposal->get_spi(this->proposal);
515
516 if (!this->initiator && !allocate_spi(this))
517 { /* responder has no SPI allocated yet */
518 DBG1(DBG_IKE, "allocating SPI failed");
519 return FAILED;
520 }
521 this->child_sa->set_proposal(this->child_sa, this->proposal);
522
523 if (!this->proposal->has_dh_group(this->proposal, this->dh_group))
524 {
525 uint16_t group;
526
527 if (this->proposal->get_algorithm(this->proposal, DIFFIE_HELLMAN_GROUP,
528 &group, NULL))
529 {
530 DBG1(DBG_IKE, "DH group %N inacceptable, requesting %N",
531 diffie_hellman_group_names, this->dh_group,
532 diffie_hellman_group_names, group);
533 this->dh_group = group;
534 return INVALID_ARG;
535 }
536 /* the selected proposal does not use a DH group */
537 DBG1(DBG_IKE, "ignoring KE exchange, agreed on a non-PFS proposal");
538 DESTROY_IF(this->dh);
539 this->dh = NULL;
540 this->dh_group = MODP_NONE;
541 }
542
543 if (this->initiator)
544 {
545 nonce_i = this->my_nonce;
546 nonce_r = this->other_nonce;
547 my_ts = narrow_ts(this, TRUE, this->tsi);
548 other_ts = narrow_ts(this, FALSE, this->tsr);
549 }
550 else
551 {
552 nonce_r = this->my_nonce;
553 nonce_i = this->other_nonce;
554 my_ts = narrow_ts(this, TRUE, this->tsr);
555 other_ts = narrow_ts(this, FALSE, this->tsi);
556 }
557
558 if (this->initiator)
559 {
560 if (ike_auth)
561 {
562 charon->bus->narrow(charon->bus, this->child_sa,
563 NARROW_INITIATOR_POST_NOAUTH, my_ts, other_ts);
564 }
565 else
566 {
567 charon->bus->narrow(charon->bus, this->child_sa,
568 NARROW_INITIATOR_POST_AUTH, my_ts, other_ts);
569 }
570 }
571 else
572 {
573 charon->bus->narrow(charon->bus, this->child_sa,
574 NARROW_RESPONDER, my_ts, other_ts);
575 }
576
577 if (my_ts->get_count(my_ts) == 0 || other_ts->get_count(other_ts) == 0)
578 {
579 charon->bus->alert(charon->bus, ALERT_TS_MISMATCH, this->tsi, this->tsr);
580 my_ts->destroy_offset(my_ts, offsetof(traffic_selector_t, destroy));
581 other_ts->destroy_offset(other_ts, offsetof(traffic_selector_t, destroy));
582 DBG1(DBG_IKE, "no acceptable traffic selectors found");
583 return NOT_FOUND;
584 }
585
586 this->tsr->destroy_offset(this->tsr, offsetof(traffic_selector_t, destroy));
587 this->tsi->destroy_offset(this->tsi, offsetof(traffic_selector_t, destroy));
588 if (this->initiator)
589 {
590 this->tsi = my_ts;
591 this->tsr = other_ts;
592 }
593 else
594 {
595 this->tsr = my_ts;
596 this->tsi = other_ts;
597 }
598
599 if (!this->initiator)
600 {
601 /* check if requested mode is acceptable, downgrade if required */
602 switch (this->mode)
603 {
604 case MODE_TRANSPORT:
605 if (!this->config->has_option(this->config, OPT_PROXY_MODE) &&
606 (!ts_list_is_host(this->tsi, other) ||
607 !ts_list_is_host(this->tsr, me))
608 )
609 {
610 this->mode = MODE_TUNNEL;
611 DBG1(DBG_IKE, "not using transport mode, not host-to-host");
612 }
613 if (this->config->get_mode(this->config) != MODE_TRANSPORT)
614 {
615 this->mode = MODE_TUNNEL;
616 }
617 break;
618 case MODE_BEET:
619 if (!ts_list_is_host(this->tsi, NULL) ||
620 !ts_list_is_host(this->tsr, NULL))
621 {
622 this->mode = MODE_TUNNEL;
623 DBG1(DBG_IKE, "not using BEET mode, not host-to-host");
624 }
625 if (this->config->get_mode(this->config) != MODE_BEET)
626 {
627 this->mode = MODE_TUNNEL;
628 }
629 break;
630 default:
631 break;
632 }
633 /* use a copy of the traffic selectors, as the POST hook should not
634 * change payloads */
635 my_ts = this->tsr->clone_offset(this->tsr,
636 offsetof(traffic_selector_t, clone));
637 other_ts = this->tsi->clone_offset(this->tsi,
638 offsetof(traffic_selector_t, clone));
639 charon->bus->narrow(charon->bus, this->child_sa,
640 NARROW_RESPONDER_POST, my_ts, other_ts);
641
642 if (my_ts->get_count(my_ts) == 0 || other_ts->get_count(other_ts) == 0)
643 {
644 my_ts->destroy_offset(my_ts,
645 offsetof(traffic_selector_t, destroy));
646 other_ts->destroy_offset(other_ts,
647 offsetof(traffic_selector_t, destroy));
648 return NOT_FOUND;
649 }
650 }
651
652 this->child_sa->set_policies(this->child_sa, my_ts, other_ts);
653 if (!this->initiator)
654 {
655 my_ts->destroy_offset(my_ts,
656 offsetof(traffic_selector_t, destroy));
657 other_ts->destroy_offset(other_ts,
658 offsetof(traffic_selector_t, destroy));
659 }
660
661 this->child_sa->set_state(this->child_sa, CHILD_INSTALLING);
662 this->child_sa->set_ipcomp(this->child_sa, this->ipcomp);
663 this->child_sa->set_mode(this->child_sa, this->mode);
664 this->child_sa->set_protocol(this->child_sa,
665 this->proposal->get_protocol(this->proposal));
666
667 if (this->my_cpi == 0 || this->other_cpi == 0 || this->ipcomp == IPCOMP_NONE)
668 {
669 this->my_cpi = this->other_cpi = 0;
670 this->ipcomp = IPCOMP_NONE;
671 }
672 status_i = status_o = FAILED;
673 if (this->keymat->derive_child_keys(this->keymat, this->proposal,
674 this->dh, nonce_i, nonce_r, &encr_i, &integ_i, &encr_r, &integ_r))
675 {
676 if (this->initiator)
677 {
678 status_i = this->child_sa->install(this->child_sa, encr_r, integ_r,
679 this->my_spi, this->my_cpi, this->initiator,
680 TRUE, this->tfcv3);
681 status_o = this->child_sa->install(this->child_sa, encr_i, integ_i,
682 this->other_spi, this->other_cpi, this->initiator,
683 FALSE, this->tfcv3);
684 }
685 else if (!this->rekey)
686 {
687 status_i = this->child_sa->install(this->child_sa, encr_i, integ_i,
688 this->my_spi, this->my_cpi, this->initiator,
689 TRUE, this->tfcv3);
690 status_o = this->child_sa->install(this->child_sa, encr_r, integ_r,
691 this->other_spi, this->other_cpi, this->initiator,
692 FALSE, this->tfcv3);
693 }
694 else
695 { /* as responder during a rekeying we only install the inbound
696 * SA now, the outbound SA and policies are installed when we
697 * receive the delete for the old SA */
698 status_i = this->child_sa->install(this->child_sa, encr_i, integ_i,
699 this->my_spi, this->my_cpi, this->initiator,
700 TRUE, this->tfcv3);
701 this->child_sa->register_outbound(this->child_sa, encr_r, integ_r,
702 this->other_spi, this->other_cpi, this->tfcv3);
703 status_o = SUCCESS;
704 }
705 }
706
707 if (status_i != SUCCESS || status_o != SUCCESS)
708 {
709 DBG1(DBG_IKE, "unable to install %s%s%sIPsec SA (SAD) in kernel",
710 (status_i != SUCCESS) ? "inbound " : "",
711 (status_i != SUCCESS && status_o != SUCCESS) ? "and ": "",
712 (status_o != SUCCESS) ? "outbound " : "");
713 charon->bus->alert(charon->bus, ALERT_INSTALL_CHILD_SA_FAILED,
714 this->child_sa);
715 status = FAILED;
716 }
717 else
718 {
719 status = this->child_sa->install_policies(this->child_sa);
720
721 if (status != SUCCESS)
722 {
723 DBG1(DBG_IKE, "unable to install IPsec policies (SPD) in kernel");
724 charon->bus->alert(charon->bus, ALERT_INSTALL_CHILD_POLICY_FAILED,
725 this->child_sa);
726 status = NOT_FOUND;
727 }
728 else
729 {
730 charon->bus->child_derived_keys(charon->bus, this->child_sa,
731 this->initiator, encr_i, encr_r,
732 integ_i, integ_r);
733 }
734 }
735 chunk_clear(&integ_i);
736 chunk_clear(&integ_r);
737 chunk_clear(&encr_i);
738 chunk_clear(&encr_r);
739
740 if (status != SUCCESS)
741 {
742 return status;
743 }
744
745 charon->bus->child_keys(charon->bus, this->child_sa, this->initiator,
746 this->dh, nonce_i, nonce_r);
747
748 this->child_sa->set_state(this->child_sa, CHILD_INSTALLED);
749 this->ike_sa->add_child_sa(this->ike_sa, this->child_sa);
750 this->established = TRUE;
751
752 schedule_inactivity_timeout(this);
753
754 my_ts = linked_list_create_from_enumerator(
755 this->child_sa->create_ts_enumerator(this->child_sa, TRUE));
756 other_ts = linked_list_create_from_enumerator(
757 this->child_sa->create_ts_enumerator(this->child_sa, FALSE));
758
759 DBG0(DBG_IKE, "%sCHILD_SA %s{%d} established "
760 "with SPIs %.8x_i %.8x_o and TS %#R === %#R",
761 this->rekey && !this->initiator ? "inbound " : "",
762 this->child_sa->get_name(this->child_sa),
763 this->child_sa->get_unique_id(this->child_sa),
764 ntohl(this->child_sa->get_spi(this->child_sa, TRUE)),
765 ntohl(this->child_sa->get_spi(this->child_sa, FALSE)),
766 my_ts, other_ts);
767
768 my_ts->destroy(my_ts);
769 other_ts->destroy(other_ts);
770 return SUCCESS;
771 }
772
773 /**
774 * build the payloads for the message
775 */
776 static bool build_payloads(private_child_create_t *this, message_t *message)
777 {
778 sa_payload_t *sa_payload;
779 nonce_payload_t *nonce_payload;
780 ke_payload_t *ke_payload;
781 ts_payload_t *ts_payload;
782 kernel_feature_t features;
783
784 /* add SA payload */
785 if (this->initiator)
786 {
787 sa_payload = sa_payload_create_from_proposals_v2(this->proposals);
788 }
789 else
790 {
791 sa_payload = sa_payload_create_from_proposal_v2(this->proposal);
792 }
793 message->add_payload(message, (payload_t*)sa_payload);
794
795 /* add nonce payload if not in IKE_AUTH */
796 if (message->get_exchange_type(message) == CREATE_CHILD_SA)
797 {
798 nonce_payload = nonce_payload_create(PLV2_NONCE);
799 nonce_payload->set_nonce(nonce_payload, this->my_nonce);
800 message->add_payload(message, (payload_t*)nonce_payload);
801 }
802
803 /* diffie hellman exchange, if PFS enabled */
804 if (this->dh)
805 {
806 ke_payload = ke_payload_create_from_diffie_hellman(PLV2_KEY_EXCHANGE,
807 this->dh);
808 if (!ke_payload)
809 {
810 DBG1(DBG_IKE, "creating KE payload failed");
811 return FALSE;
812 }
813 message->add_payload(message, (payload_t*)ke_payload);
814 }
815
816 /* add TSi/TSr payloads */
817 ts_payload = ts_payload_create_from_traffic_selectors(TRUE, this->tsi);
818 message->add_payload(message, (payload_t*)ts_payload);
819 ts_payload = ts_payload_create_from_traffic_selectors(FALSE, this->tsr);
820 message->add_payload(message, (payload_t*)ts_payload);
821
822 /* add a notify if we are not in tunnel mode */
823 switch (this->mode)
824 {
825 case MODE_TRANSPORT:
826 message->add_notify(message, FALSE, USE_TRANSPORT_MODE, chunk_empty);
827 break;
828 case MODE_BEET:
829 message->add_notify(message, FALSE, USE_BEET_MODE, chunk_empty);
830 break;
831 default:
832 break;
833 }
834
835 features = charon->kernel->get_features(charon->kernel);
836 if (!(features & KERNEL_ESP_V3_TFC))
837 {
838 message->add_notify(message, FALSE, ESP_TFC_PADDING_NOT_SUPPORTED,
839 chunk_empty);
840 }
841 return TRUE;
842 }
843
844 /**
845 * Adds an IPCOMP_SUPPORTED notify to the message, allocating a CPI
846 */
847 static void add_ipcomp_notify(private_child_create_t *this,
848 message_t *message, uint8_t ipcomp)
849 {
850 this->my_cpi = this->child_sa->alloc_cpi(this->child_sa);
851 if (this->my_cpi)
852 {
853 this->ipcomp = ipcomp;
854 message->add_notify(message, FALSE, IPCOMP_SUPPORTED,
855 chunk_cata("cc", chunk_from_thing(this->my_cpi),
856 chunk_from_thing(ipcomp)));
857 }
858 else
859 {
860 DBG1(DBG_IKE, "unable to allocate a CPI from kernel, IPComp disabled");
861 }
862 }
863
864 /**
865 * handle a received notify payload
866 */
867 static void handle_notify(private_child_create_t *this, notify_payload_t *notify)
868 {
869 switch (notify->get_notify_type(notify))
870 {
871 case USE_TRANSPORT_MODE:
872 this->mode = MODE_TRANSPORT;
873 break;
874 case USE_BEET_MODE:
875 if (this->ike_sa->supports_extension(this->ike_sa, EXT_STRONGSWAN))
876 { /* handle private use notify only if we know its meaning */
877 this->mode = MODE_BEET;
878 }
879 else
880 {
881 DBG1(DBG_IKE, "received a notify strongSwan uses for BEET "
882 "mode, but peer implementation unknown, skipped");
883 }
884 break;
885 case IPCOMP_SUPPORTED:
886 {
887 ipcomp_transform_t ipcomp;
888 uint16_t cpi;
889 chunk_t data;
890
891 data = notify->get_notification_data(notify);
892 cpi = *(uint16_t*)data.ptr;
893 ipcomp = (ipcomp_transform_t)(*(data.ptr + 2));
894 switch (ipcomp)
895 {
896 case IPCOMP_DEFLATE:
897 this->other_cpi = cpi;
898 this->ipcomp_received = ipcomp;
899 break;
900 case IPCOMP_LZS:
901 case IPCOMP_LZJH:
902 default:
903 DBG1(DBG_IKE, "received IPCOMP_SUPPORTED notify with a "
904 "transform ID we don't support %N",
905 ipcomp_transform_names, ipcomp);
906 break;
907 }
908 break;
909 }
910 case ESP_TFC_PADDING_NOT_SUPPORTED:
911 DBG1(DBG_IKE, "received %N, not using ESPv3 TFC padding",
912 notify_type_names, notify->get_notify_type(notify));
913 this->tfcv3 = FALSE;
914 break;
915 default:
916 break;
917 }
918 }
919
920 /**
921 * Read payloads from message
922 */
923 static void process_payloads(private_child_create_t *this, message_t *message)
924 {
925 enumerator_t *enumerator;
926 payload_t *payload;
927 sa_payload_t *sa_payload;
928 ke_payload_t *ke_payload;
929 ts_payload_t *ts_payload;
930
931 /* defaults to TUNNEL mode */
932 this->mode = MODE_TUNNEL;
933
934 enumerator = message->create_payload_enumerator(message);
935 while (enumerator->enumerate(enumerator, &payload))
936 {
937 switch (payload->get_type(payload))
938 {
939 case PLV2_SECURITY_ASSOCIATION:
940 sa_payload = (sa_payload_t*)payload;
941 this->proposals = sa_payload->get_proposals(sa_payload);
942 break;
943 case PLV2_KEY_EXCHANGE:
944 ke_payload = (ke_payload_t*)payload;
945 if (!this->initiator)
946 {
947 this->dh_group = ke_payload->get_dh_group_number(ke_payload);
948 this->dh = this->keymat->keymat.create_dh(
949 &this->keymat->keymat, this->dh_group);
950 }
951 if (this->dh)
952 {
953 this->dh_failed = !this->dh->set_other_public_value(this->dh,
954 ke_payload->get_key_exchange_data(ke_payload));
955 }
956 break;
957 case PLV2_TS_INITIATOR:
958 ts_payload = (ts_payload_t*)payload;
959 this->tsi = ts_payload->get_traffic_selectors(ts_payload);
960 break;
961 case PLV2_TS_RESPONDER:
962 ts_payload = (ts_payload_t*)payload;
963 this->tsr = ts_payload->get_traffic_selectors(ts_payload);
964 break;
965 case PLV2_NOTIFY:
966 handle_notify(this, (notify_payload_t*)payload);
967 break;
968 default:
969 break;
970 }
971 }
972 enumerator->destroy(enumerator);
973 }
974
975 METHOD(task_t, build_i, status_t,
976 private_child_create_t *this, message_t *message)
977 {
978 enumerator_t *enumerator;
979 host_t *vip;
980 peer_cfg_t *peer_cfg;
981 linked_list_t *list;
982
983 switch (message->get_exchange_type(message))
984 {
985 case IKE_SA_INIT:
986 return get_nonce(message, &this->my_nonce);
987 case CREATE_CHILD_SA:
988 if (!generate_nonce(this))
989 {
990 message->add_notify(message, FALSE, NO_PROPOSAL_CHOSEN,
991 chunk_empty);
992 return SUCCESS;
993 }
994 if (!this->retry)
995 {
996 this->dh_group = this->config->get_dh_group(this->config);
997 }
998 break;
999 case IKE_AUTH:
1000 if (message->get_message_id(message) != 1)
1001 {
1002 /* send only in the first request, not in subsequent rounds */
1003 return NEED_MORE;
1004 }
1005 break;
1006 default:
1007 break;
1008 }
1009
1010 if (this->reqid)
1011 {
1012 DBG0(DBG_IKE, "establishing CHILD_SA %s{%d}",
1013 this->config->get_name(this->config), this->reqid);
1014 }
1015 else
1016 {
1017 DBG0(DBG_IKE, "establishing CHILD_SA %s",
1018 this->config->get_name(this->config));
1019 }
1020
1021 /* check if we want a virtual IP, but don't have one */
1022 list = linked_list_create();
1023 peer_cfg = this->ike_sa->get_peer_cfg(this->ike_sa);
1024 if (!this->rekey)
1025 {
1026 enumerator = peer_cfg->create_virtual_ip_enumerator(peer_cfg);
1027 while (enumerator->enumerate(enumerator, &vip))
1028 {
1029 /* propose a 0.0.0.0/0 or ::/0 subnet when we use virtual ip */
1030 vip = host_create_any(vip->get_family(vip));
1031 list->insert_last(list, vip);
1032 }
1033 enumerator->destroy(enumerator);
1034 }
1035 if (list->get_count(list))
1036 {
1037 this->tsi = this->config->get_traffic_selectors(this->config,
1038 TRUE, NULL, list);
1039 list->destroy_offset(list, offsetof(host_t, destroy));
1040 }
1041 else
1042 { /* no virtual IPs configured */
1043 list->destroy(list);
1044 list = get_dynamic_hosts(this->ike_sa, TRUE);
1045 this->tsi = this->config->get_traffic_selectors(this->config,
1046 TRUE, NULL, list);
1047 list->destroy(list);
1048 }
1049 list = get_dynamic_hosts(this->ike_sa, FALSE);
1050 this->tsr = this->config->get_traffic_selectors(this->config,
1051 FALSE, NULL, list);
1052 list->destroy(list);
1053
1054 if (this->packet_tsi)
1055 {
1056 this->tsi->insert_first(this->tsi,
1057 this->packet_tsi->clone(this->packet_tsi));
1058 }
1059 if (this->packet_tsr)
1060 {
1061 this->tsr->insert_first(this->tsr,
1062 this->packet_tsr->clone(this->packet_tsr));
1063 }
1064 this->proposals = this->config->get_proposals(this->config,
1065 this->dh_group == MODP_NONE);
1066 this->mode = this->config->get_mode(this->config);
1067
1068 this->child_sa = child_sa_create(this->ike_sa->get_my_host(this->ike_sa),
1069 this->ike_sa->get_other_host(this->ike_sa), this->config, this->reqid,
1070 this->ike_sa->has_condition(this->ike_sa, COND_NAT_ANY),
1071 this->mark_in, this->mark_out);
1072
1073 if (!allocate_spi(this))
1074 {
1075 DBG1(DBG_IKE, "unable to allocate SPIs from kernel");
1076 return FAILED;
1077 }
1078
1079 if (this->dh_group != MODP_NONE)
1080 {
1081 this->dh = this->keymat->keymat.create_dh(&this->keymat->keymat,
1082 this->dh_group);
1083 }
1084
1085 if (this->config->has_option(this->config, OPT_IPCOMP))
1086 {
1087 /* IPCOMP_DEFLATE is the only transform we support at the moment */
1088 add_ipcomp_notify(this, message, IPCOMP_DEFLATE);
1089 }
1090
1091 if (message->get_exchange_type(message) == IKE_AUTH)
1092 {
1093 charon->bus->narrow(charon->bus, this->child_sa,
1094 NARROW_INITIATOR_PRE_NOAUTH, this->tsi, this->tsr);
1095 }
1096 else
1097 {
1098 charon->bus->narrow(charon->bus, this->child_sa,
1099 NARROW_INITIATOR_PRE_AUTH, this->tsi, this->tsr);
1100 }
1101
1102 if (!build_payloads(this, message))
1103 {
1104 return FAILED;
1105 }
1106
1107 this->tsi->destroy_offset(this->tsi, offsetof(traffic_selector_t, destroy));
1108 this->tsr->destroy_offset(this->tsr, offsetof(traffic_selector_t, destroy));
1109 this->proposals->destroy_offset(this->proposals, offsetof(proposal_t, destroy));
1110 this->tsi = NULL;
1111 this->tsr = NULL;
1112 this->proposals = NULL;
1113
1114 return NEED_MORE;
1115 }
1116
1117 METHOD(task_t, process_r, status_t,
1118 private_child_create_t *this, message_t *message)
1119 {
1120 switch (message->get_exchange_type(message))
1121 {
1122 case IKE_SA_INIT:
1123 return get_nonce(message, &this->other_nonce);
1124 case CREATE_CHILD_SA:
1125 get_nonce(message, &this->other_nonce);
1126 break;
1127 case IKE_AUTH:
1128 if (message->get_message_id(message) != 1)
1129 {
1130 /* only handle first AUTH payload, not additional rounds */
1131 return NEED_MORE;
1132 }
1133 default:
1134 break;
1135 }
1136
1137 process_payloads(this, message);
1138
1139 return NEED_MORE;
1140 }
1141
1142 /**
1143 * handle CHILD_SA setup failure
1144 */
1145 static void handle_child_sa_failure(private_child_create_t *this,
1146 message_t *message)
1147 {
1148 bool is_first;
1149
1150 is_first = message->get_exchange_type(message) == IKE_AUTH;
1151 if (is_first &&
1152 lib->settings->get_bool(lib->settings,
1153 "%s.close_ike_on_child_failure", FALSE, lib->ns))
1154 {
1155 /* we delay the delete for 100ms, as the IKE_AUTH response must arrive
1156 * first */
1157 DBG1(DBG_IKE, "closing IKE_SA due CHILD_SA setup failure");
1158 lib->scheduler->schedule_job_ms(lib->scheduler, (job_t*)
1159 delete_ike_sa_job_create(this->ike_sa->get_id(this->ike_sa), TRUE),
1160 100);
1161 }
1162 else
1163 {
1164 DBG1(DBG_IKE, "failed to establish CHILD_SA, keeping IKE_SA");
1165 charon->bus->alert(charon->bus, ALERT_KEEP_ON_CHILD_SA_FAILURE,
1166 is_first);
1167 }
1168 }
1169
1170 /**
1171 * Substitute transport mode NAT selectors, if applicable
1172 */
1173 static linked_list_t* get_ts_if_nat_transport(private_child_create_t *this,
1174 bool local, linked_list_t *in)
1175 {
1176 linked_list_t *out = NULL;
1177 ike_condition_t cond;
1178
1179 if (this->mode == MODE_TRANSPORT)
1180 {
1181 cond = local ? COND_NAT_HERE : COND_NAT_THERE;
1182 if (this->ike_sa->has_condition(this->ike_sa, cond))
1183 {
1184 out = get_transport_nat_ts(this, local, in);
1185 if (out->get_count(out) == 0)
1186 {
1187 out->destroy(out);
1188 out = NULL;
1189 }
1190 }
1191 }
1192 return out;
1193 }
1194
1195 /**
1196 * Select a matching CHILD config as responder
1197 */
1198 static child_cfg_t* select_child_cfg(private_child_create_t *this)
1199 {
1200 peer_cfg_t *peer_cfg;
1201 child_cfg_t *child_cfg = NULL;;
1202
1203 peer_cfg = this->ike_sa->get_peer_cfg(this->ike_sa);
1204 if (peer_cfg && this->tsi && this->tsr)
1205 {
1206 linked_list_t *listr, *listi, *tsr, *tsi;
1207
1208 tsr = get_ts_if_nat_transport(this, TRUE, this->tsr);
1209 tsi = get_ts_if_nat_transport(this, FALSE, this->tsi);
1210
1211 listr = get_dynamic_hosts(this->ike_sa, TRUE);
1212 listi = get_dynamic_hosts(this->ike_sa, FALSE);
1213 child_cfg = peer_cfg->select_child_cfg(peer_cfg,
1214 tsr ?: this->tsr, tsi ?: this->tsi,
1215 listr, listi);
1216 if ((tsi || tsr) && child_cfg &&
1217 child_cfg->get_mode(child_cfg) != MODE_TRANSPORT)
1218 {
1219 /* found a CHILD config, but it doesn't use transport mode */
1220 child_cfg->destroy(child_cfg);
1221 child_cfg = NULL;
1222 }
1223 if (!child_cfg && (tsi || tsr))
1224 {
1225 /* no match for the substituted NAT selectors, try it without */
1226 child_cfg = peer_cfg->select_child_cfg(peer_cfg,
1227 this->tsr, this->tsi, listr, listi);
1228 }
1229 listr->destroy(listr);
1230 listi->destroy(listi);
1231 DESTROY_OFFSET_IF(tsi, offsetof(traffic_selector_t, destroy));
1232 DESTROY_OFFSET_IF(tsr, offsetof(traffic_selector_t, destroy));
1233 }
1234
1235 return child_cfg;
1236 }
1237
1238 METHOD(task_t, build_r, status_t,
1239 private_child_create_t *this, message_t *message)
1240 {
1241 payload_t *payload;
1242 enumerator_t *enumerator;
1243 bool no_dh = TRUE, ike_auth = FALSE;
1244
1245 switch (message->get_exchange_type(message))
1246 {
1247 case IKE_SA_INIT:
1248 return get_nonce(message, &this->my_nonce);
1249 case CREATE_CHILD_SA:
1250 if (!generate_nonce(this))
1251 {
1252 message->add_notify(message, FALSE, NO_PROPOSAL_CHOSEN,
1253 chunk_empty);
1254 return SUCCESS;
1255 }
1256 if (this->dh_failed)
1257 {
1258 DBG1(DBG_IKE, "applying DH public value failed");
1259 message->add_notify(message, FALSE, NO_PROPOSAL_CHOSEN,
1260 chunk_empty);
1261 return SUCCESS;
1262 }
1263 no_dh = FALSE;
1264 break;
1265 case IKE_AUTH:
1266 if (this->ike_sa->get_state(this->ike_sa) != IKE_ESTABLISHED)
1267 { /* wait until all authentication round completed */
1268 return NEED_MORE;
1269 }
1270 if (this->ike_sa->has_condition(this->ike_sa, COND_REDIRECTED))
1271 { /* no CHILD_SA is created for redirected SAs */
1272 return SUCCESS;
1273 }
1274 ike_auth = TRUE;
1275 default:
1276 break;
1277 }
1278
1279 if (this->ike_sa->get_state(this->ike_sa) == IKE_REKEYING)
1280 {
1281 DBG1(DBG_IKE, "unable to create CHILD_SA while rekeying IKE_SA");
1282 message->add_notify(message, TRUE, TEMPORARY_FAILURE, chunk_empty);
1283 return SUCCESS;
1284 }
1285 if (this->ike_sa->get_state(this->ike_sa) == IKE_DELETING)
1286 {
1287 DBG1(DBG_IKE, "unable to create CHILD_SA while deleting IKE_SA");
1288 message->add_notify(message, TRUE, TEMPORARY_FAILURE, chunk_empty);
1289 return SUCCESS;
1290 }
1291
1292 if (this->config == NULL)
1293 {
1294 this->config = select_child_cfg(this);
1295 }
1296 if (this->config == NULL)
1297 {
1298 DBG1(DBG_IKE, "traffic selectors %#R === %#R inacceptable",
1299 this->tsr, this->tsi);
1300 charon->bus->alert(charon->bus, ALERT_TS_MISMATCH, this->tsi, this->tsr);
1301 message->add_notify(message, FALSE, TS_UNACCEPTABLE, chunk_empty);
1302 handle_child_sa_failure(this, message);
1303 return SUCCESS;
1304 }
1305
1306 /* check if ike_config_t included non-critical error notifies */
1307 enumerator = message->create_payload_enumerator(message);
1308 while (enumerator->enumerate(enumerator, &payload))
1309 {
1310 if (payload->get_type(payload) == PLV2_NOTIFY)
1311 {
1312 notify_payload_t *notify = (notify_payload_t*)payload;
1313
1314 switch (notify->get_notify_type(notify))
1315 {
1316 case INTERNAL_ADDRESS_FAILURE:
1317 case FAILED_CP_REQUIRED:
1318 {
1319 DBG1(DBG_IKE,"configuration payload negotiation "
1320 "failed, no CHILD_SA built");
1321 enumerator->destroy(enumerator);
1322 handle_child_sa_failure(this, message);
1323 return SUCCESS;
1324 }
1325 default:
1326 break;
1327 }
1328 }
1329 }
1330 enumerator->destroy(enumerator);
1331
1332 this->child_sa = child_sa_create(this->ike_sa->get_my_host(this->ike_sa),
1333 this->ike_sa->get_other_host(this->ike_sa), this->config, this->reqid,
1334 this->ike_sa->has_condition(this->ike_sa, COND_NAT_ANY),
1335 this->mark_in, this->mark_out);
1336
1337 if (this->ipcomp_received != IPCOMP_NONE)
1338 {
1339 if (this->config->has_option(this->config, OPT_IPCOMP))
1340 {
1341 add_ipcomp_notify(this, message, this->ipcomp_received);
1342 }
1343 else
1344 {
1345 DBG1(DBG_IKE, "received %N notify but IPComp is disabled, ignoring",
1346 notify_type_names, IPCOMP_SUPPORTED);
1347 }
1348 }
1349
1350 switch (select_and_install(this, no_dh, ike_auth))
1351 {
1352 case SUCCESS:
1353 break;
1354 case NOT_FOUND:
1355 message->add_notify(message, FALSE, TS_UNACCEPTABLE, chunk_empty);
1356 handle_child_sa_failure(this, message);
1357 return SUCCESS;
1358 case INVALID_ARG:
1359 {
1360 uint16_t group = htons(this->dh_group);
1361 message->add_notify(message, FALSE, INVALID_KE_PAYLOAD,
1362 chunk_from_thing(group));
1363 handle_child_sa_failure(this, message);
1364 return SUCCESS;
1365 }
1366 case FAILED:
1367 default:
1368 message->add_notify(message, FALSE, NO_PROPOSAL_CHOSEN, chunk_empty);
1369 handle_child_sa_failure(this, message);
1370 return SUCCESS;
1371 }
1372
1373 if (!build_payloads(this, message))
1374 {
1375 message->add_notify(message, FALSE, NO_PROPOSAL_CHOSEN, chunk_empty);
1376 handle_child_sa_failure(this, message);
1377 return SUCCESS;
1378 }
1379
1380 if (!this->rekey)
1381 { /* invoke the child_up() hook if we are not rekeying */
1382 charon->bus->child_updown(charon->bus, this->child_sa, TRUE);
1383 }
1384 return SUCCESS;
1385 }
1386
1387 /**
1388 * Raise alerts for received notify errors
1389 */
1390 static void raise_alerts(private_child_create_t *this, notify_type_t type)
1391 {
1392 linked_list_t *list;
1393
1394 switch (type)
1395 {
1396 case NO_PROPOSAL_CHOSEN:
1397 list = this->config->get_proposals(this->config, FALSE);
1398 charon->bus->alert(charon->bus, ALERT_PROPOSAL_MISMATCH_CHILD, list);
1399 list->destroy_offset(list, offsetof(proposal_t, destroy));
1400 break;
1401 default:
1402 break;
1403 }
1404 }
1405
1406 METHOD(task_t, build_i_delete, status_t,
1407 private_child_create_t *this, message_t *message)
1408 {
1409 message->set_exchange_type(message, INFORMATIONAL);
1410 if (this->my_spi && this->proto)
1411 {
1412 delete_payload_t *del;
1413
1414 del = delete_payload_create(PLV2_DELETE, this->proto);
1415 del->add_spi(del, this->my_spi);
1416 message->add_payload(message, (payload_t*)del);
1417
1418 DBG1(DBG_IKE, "sending DELETE for %N CHILD_SA with SPI %.8x",
1419 protocol_id_names, this->proto, ntohl(this->my_spi));
1420 }
1421 return NEED_MORE;
1422 }
1423
1424 /**
1425 * Change task to delete the failed CHILD_SA as initiator
1426 */
1427 static status_t delete_failed_sa(private_child_create_t *this)
1428 {
1429 if (this->my_spi && this->proto)
1430 {
1431 this->public.task.build = _build_i_delete;
1432 this->public.task.process = (void*)return_success;
1433 return NEED_MORE;
1434 }
1435 return SUCCESS;
1436 }
1437
1438 METHOD(task_t, process_i, status_t,
1439 private_child_create_t *this, message_t *message)
1440 {
1441 enumerator_t *enumerator;
1442 payload_t *payload;
1443 bool no_dh = TRUE, ike_auth = FALSE;
1444
1445 switch (message->get_exchange_type(message))
1446 {
1447 case IKE_SA_INIT:
1448 return get_nonce(message, &this->other_nonce);
1449 case CREATE_CHILD_SA:
1450 get_nonce(message, &this->other_nonce);
1451 no_dh = FALSE;
1452 break;
1453 case IKE_AUTH:
1454 if (this->ike_sa->get_state(this->ike_sa) != IKE_ESTABLISHED)
1455 { /* wait until all authentication round completed */
1456 return NEED_MORE;
1457 }
1458 ike_auth = TRUE;
1459 default:
1460 break;
1461 }
1462
1463 /* check for erroneous notifies */
1464 enumerator = message->create_payload_enumerator(message);
1465 while (enumerator->enumerate(enumerator, &payload))
1466 {
1467 if (payload->get_type(payload) == PLV2_NOTIFY)
1468 {
1469 notify_payload_t *notify = (notify_payload_t*)payload;
1470 notify_type_t type = notify->get_notify_type(notify);
1471
1472 switch (type)
1473 {
1474 /* handle notify errors related to CHILD_SA only */
1475 case NO_PROPOSAL_CHOSEN:
1476 case SINGLE_PAIR_REQUIRED:
1477 case NO_ADDITIONAL_SAS:
1478 case INTERNAL_ADDRESS_FAILURE:
1479 case FAILED_CP_REQUIRED:
1480 case TS_UNACCEPTABLE:
1481 case INVALID_SELECTORS:
1482 {
1483 DBG1(DBG_IKE, "received %N notify, no CHILD_SA built",
1484 notify_type_names, type);
1485 enumerator->destroy(enumerator);
1486 raise_alerts(this, type);
1487 handle_child_sa_failure(this, message);
1488 /* an error in CHILD_SA creation is not critical */
1489 return SUCCESS;
1490 }
1491 case TEMPORARY_FAILURE:
1492 {
1493 DBG1(DBG_IKE, "received %N notify, will retry later",
1494 notify_type_names, type);
1495 enumerator->destroy(enumerator);
1496 if (!this->rekey)
1497 { /* the rekey task will retry itself if necessary */
1498 schedule_delayed_retry(this);
1499 }
1500 return SUCCESS;
1501 }
1502 case INVALID_KE_PAYLOAD:
1503 {
1504 chunk_t data;
1505 uint16_t group = MODP_NONE;
1506
1507 data = notify->get_notification_data(notify);
1508 if (data.len == sizeof(group))
1509 {
1510 memcpy(&group, data.ptr, data.len);
1511 group = ntohs(group);
1512 }
1513 DBG1(DBG_IKE, "peer didn't accept DH group %N, "
1514 "it requested %N", diffie_hellman_group_names,
1515 this->dh_group, diffie_hellman_group_names, group);
1516 this->retry = TRUE;
1517 this->dh_group = group;
1518 this->child_sa->set_state(this->child_sa, CHILD_RETRYING);
1519 this->public.task.migrate(&this->public.task, this->ike_sa);
1520 enumerator->destroy(enumerator);
1521 return NEED_MORE;
1522 }
1523 default:
1524 {
1525 if (message->get_exchange_type(message) == CREATE_CHILD_SA)
1526 { /* handle notifies if not handled in IKE_AUTH */
1527 if (type <= 16383)
1528 {
1529 DBG1(DBG_IKE, "received %N notify error",
1530 notify_type_names, type);
1531 enumerator->destroy(enumerator);
1532 return SUCCESS;
1533 }
1534 DBG2(DBG_IKE, "received %N notify",
1535 notify_type_names, type);
1536 }
1537 break;
1538 }
1539 }
1540 }
1541 }
1542 enumerator->destroy(enumerator);
1543
1544 process_payloads(this, message);
1545
1546 if (this->ipcomp == IPCOMP_NONE && this->ipcomp_received != IPCOMP_NONE)
1547 {
1548 DBG1(DBG_IKE, "received an IPCOMP_SUPPORTED notify without requesting"
1549 " one, no CHILD_SA built");
1550 handle_child_sa_failure(this, message);
1551 return delete_failed_sa(this);
1552 }
1553 else if (this->ipcomp != IPCOMP_NONE && this->ipcomp_received == IPCOMP_NONE)
1554 {
1555 DBG1(DBG_IKE, "peer didn't accept our proposed IPComp transforms, "
1556 "IPComp is disabled");
1557 this->ipcomp = IPCOMP_NONE;
1558 }
1559 else if (this->ipcomp != IPCOMP_NONE && this->ipcomp != this->ipcomp_received)
1560 {
1561 DBG1(DBG_IKE, "received an IPCOMP_SUPPORTED notify we didn't propose, "
1562 "no CHILD_SA built");
1563 handle_child_sa_failure(this, message);
1564 return delete_failed_sa(this);
1565 }
1566
1567 if (this->dh_failed)
1568 {
1569 DBG1(DBG_IKE, "applying DH public value failed");
1570 handle_child_sa_failure(this, message);
1571 return delete_failed_sa(this);
1572 }
1573
1574 if (select_and_install(this, no_dh, ike_auth) == SUCCESS)
1575 {
1576 if (!this->rekey)
1577 { /* invoke the child_up() hook if we are not rekeying */
1578 charon->bus->child_updown(charon->bus, this->child_sa, TRUE);
1579 }
1580 }
1581 else
1582 {
1583 handle_child_sa_failure(this, message);
1584 return delete_failed_sa(this);
1585 }
1586 return SUCCESS;
1587 }
1588
1589 METHOD(child_create_t, use_reqid, void,
1590 private_child_create_t *this, uint32_t reqid)
1591 {
1592 this->reqid = reqid;
1593 }
1594
1595 METHOD(child_create_t, use_marks, void,
1596 private_child_create_t *this, u_int in, u_int out)
1597 {
1598 this->mark_in = in;
1599 this->mark_out = out;
1600 }
1601
1602 METHOD(child_create_t, get_child, child_sa_t*,
1603 private_child_create_t *this)
1604 {
1605 return this->child_sa;
1606 }
1607
1608 METHOD(child_create_t, set_config, void,
1609 private_child_create_t *this, child_cfg_t *cfg)
1610 {
1611 DESTROY_IF(this->config);
1612 this->config = cfg;
1613 }
1614
1615 METHOD(child_create_t, get_lower_nonce, chunk_t,
1616 private_child_create_t *this)
1617 {
1618 if (memcmp(this->my_nonce.ptr, this->other_nonce.ptr,
1619 min(this->my_nonce.len, this->other_nonce.len)) < 0)
1620 {
1621 return this->my_nonce;
1622 }
1623 else
1624 {
1625 return this->other_nonce;
1626 }
1627 }
1628
1629 METHOD(task_t, get_type, task_type_t,
1630 private_child_create_t *this)
1631 {
1632 return TASK_CHILD_CREATE;
1633 }
1634
1635 METHOD(task_t, migrate, void,
1636 private_child_create_t *this, ike_sa_t *ike_sa)
1637 {
1638 chunk_free(&this->my_nonce);
1639 chunk_free(&this->other_nonce);
1640 if (this->tsr)
1641 {
1642 this->tsr->destroy_offset(this->tsr, offsetof(traffic_selector_t, destroy));
1643 }
1644 if (this->tsi)
1645 {
1646 this->tsi->destroy_offset(this->tsi, offsetof(traffic_selector_t, destroy));
1647 }
1648 DESTROY_IF(this->child_sa);
1649 DESTROY_IF(this->proposal);
1650 DESTROY_IF(this->nonceg);
1651 DESTROY_IF(this->dh);
1652 this->dh_failed = FALSE;
1653 if (this->proposals)
1654 {
1655 this->proposals->destroy_offset(this->proposals, offsetof(proposal_t, destroy));
1656 }
1657
1658 this->ike_sa = ike_sa;
1659 this->keymat = (keymat_v2_t*)ike_sa->get_keymat(ike_sa);
1660 this->proposal = NULL;
1661 this->proposals = NULL;
1662 this->tsi = NULL;
1663 this->tsr = NULL;
1664 this->dh = NULL;
1665 this->nonceg = NULL;
1666 this->child_sa = NULL;
1667 this->mode = MODE_TUNNEL;
1668 this->ipcomp = IPCOMP_NONE;
1669 this->ipcomp_received = IPCOMP_NONE;
1670 this->other_cpi = 0;
1671 this->reqid = 0;
1672 this->mark_in = 0;
1673 this->mark_out = 0;
1674 this->established = FALSE;
1675 }
1676
1677 METHOD(task_t, destroy, void,
1678 private_child_create_t *this)
1679 {
1680 chunk_free(&this->my_nonce);
1681 chunk_free(&this->other_nonce);
1682 if (this->tsr)
1683 {
1684 this->tsr->destroy_offset(this->tsr, offsetof(traffic_selector_t, destroy));
1685 }
1686 if (this->tsi)
1687 {
1688 this->tsi->destroy_offset(this->tsi, offsetof(traffic_selector_t, destroy));
1689 }
1690 if (!this->established)
1691 {
1692 DESTROY_IF(this->child_sa);
1693 }
1694 DESTROY_IF(this->packet_tsi);
1695 DESTROY_IF(this->packet_tsr);
1696 DESTROY_IF(this->proposal);
1697 DESTROY_IF(this->dh);
1698 if (this->proposals)
1699 {
1700 this->proposals->destroy_offset(this->proposals, offsetof(proposal_t, destroy));
1701 }
1702 DESTROY_IF(this->config);
1703 DESTROY_IF(this->nonceg);
1704 free(this);
1705 }
1706
1707 /*
1708 * Described in header.
1709 */
1710 child_create_t *child_create_create(ike_sa_t *ike_sa,
1711 child_cfg_t *config, bool rekey,
1712 traffic_selector_t *tsi, traffic_selector_t *tsr)
1713 {
1714 private_child_create_t *this;
1715
1716 INIT(this,
1717 .public = {
1718 .get_child = _get_child,
1719 .set_config = _set_config,
1720 .get_lower_nonce = _get_lower_nonce,
1721 .use_reqid = _use_reqid,
1722 .use_marks = _use_marks,
1723 .task = {
1724 .get_type = _get_type,
1725 .migrate = _migrate,
1726 .destroy = _destroy,
1727 },
1728 },
1729 .ike_sa = ike_sa,
1730 .config = config,
1731 .packet_tsi = tsi ? tsi->clone(tsi) : NULL,
1732 .packet_tsr = tsr ? tsr->clone(tsr) : NULL,
1733 .dh_group = MODP_NONE,
1734 .keymat = (keymat_v2_t*)ike_sa->get_keymat(ike_sa),
1735 .mode = MODE_TUNNEL,
1736 .tfcv3 = TRUE,
1737 .ipcomp = IPCOMP_NONE,
1738 .ipcomp_received = IPCOMP_NONE,
1739 .rekey = rekey,
1740 .retry = FALSE,
1741 );
1742
1743 if (config)
1744 {
1745 this->public.task.build = _build_i;
1746 this->public.task.process = _process_i;
1747 this->initiator = TRUE;
1748 }
1749 else
1750 {
1751 this->public.task.build = _build_r;
1752 this->public.task.process = _process_r;
1753 this->initiator = FALSE;
1754 }
1755 return &this->public;
1756 }