64a82850b8276142534c4ebc4d747088ec4ca51f
[strongswan.git] / src / libcharon / sa / ikev2 / tasks / child_create.c
1 /*
2 * Copyright (C) 2008-2016 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->use_proxy_mode(this->config) &&
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 }
634
635 this->child_sa->set_state(this->child_sa, CHILD_INSTALLING);
636 this->child_sa->set_ipcomp(this->child_sa, this->ipcomp);
637 this->child_sa->set_mode(this->child_sa, this->mode);
638 this->child_sa->set_protocol(this->child_sa,
639 this->proposal->get_protocol(this->proposal));
640
641 if (this->my_cpi == 0 || this->other_cpi == 0 || this->ipcomp == IPCOMP_NONE)
642 {
643 this->my_cpi = this->other_cpi = 0;
644 this->ipcomp = IPCOMP_NONE;
645 }
646 status_i = status_o = FAILED;
647 if (this->keymat->derive_child_keys(this->keymat, this->proposal,
648 this->dh, nonce_i, nonce_r, &encr_i, &integ_i, &encr_r, &integ_r))
649 {
650 if (this->initiator)
651 {
652 status_i = this->child_sa->install(this->child_sa, encr_r, integ_r,
653 this->my_spi, this->my_cpi, this->initiator,
654 TRUE, this->tfcv3, my_ts, other_ts);
655 status_o = this->child_sa->install(this->child_sa, encr_i, integ_i,
656 this->other_spi, this->other_cpi, this->initiator,
657 FALSE, this->tfcv3, my_ts, other_ts);
658 }
659 else
660 {
661 status_i = this->child_sa->install(this->child_sa, encr_i, integ_i,
662 this->my_spi, this->my_cpi, this->initiator,
663 TRUE, this->tfcv3, my_ts, other_ts);
664 status_o = this->child_sa->install(this->child_sa, encr_r, integ_r,
665 this->other_spi, this->other_cpi, this->initiator,
666 FALSE, this->tfcv3, my_ts, other_ts);
667 }
668 }
669 chunk_clear(&integ_i);
670 chunk_clear(&integ_r);
671 chunk_clear(&encr_i);
672 chunk_clear(&encr_r);
673
674 if (status_i != SUCCESS || status_o != SUCCESS)
675 {
676 DBG1(DBG_IKE, "unable to install %s%s%sIPsec SA (SAD) in kernel",
677 (status_i != SUCCESS) ? "inbound " : "",
678 (status_i != SUCCESS && status_o != SUCCESS) ? "and ": "",
679 (status_o != SUCCESS) ? "outbound " : "");
680 charon->bus->alert(charon->bus, ALERT_INSTALL_CHILD_SA_FAILED,
681 this->child_sa);
682 return FAILED;
683 }
684
685 if (this->initiator)
686 {
687 status = this->child_sa->add_policies(this->child_sa, my_ts, other_ts);
688 }
689 else
690 {
691 /* use a copy of the traffic selectors, as the POST hook should not
692 * change payloads */
693 my_ts = this->tsr->clone_offset(this->tsr,
694 offsetof(traffic_selector_t, clone));
695 other_ts = this->tsi->clone_offset(this->tsi,
696 offsetof(traffic_selector_t, clone));
697 charon->bus->narrow(charon->bus, this->child_sa,
698 NARROW_RESPONDER_POST, my_ts, other_ts);
699 if (my_ts->get_count(my_ts) == 0 || other_ts->get_count(other_ts) == 0)
700 {
701 status = FAILED;
702 }
703 else
704 {
705 status = this->child_sa->add_policies(this->child_sa,
706 my_ts, other_ts);
707 }
708 my_ts->destroy_offset(my_ts, offsetof(traffic_selector_t, destroy));
709 other_ts->destroy_offset(other_ts, offsetof(traffic_selector_t, destroy));
710 }
711 if (status != SUCCESS)
712 {
713 DBG1(DBG_IKE, "unable to install IPsec policies (SPD) in kernel");
714 charon->bus->alert(charon->bus, ALERT_INSTALL_CHILD_POLICY_FAILED,
715 this->child_sa);
716 return NOT_FOUND;
717 }
718
719 charon->bus->child_keys(charon->bus, this->child_sa, this->initiator,
720 this->dh, nonce_i, nonce_r);
721
722 /* add to IKE_SA, and remove from task */
723 this->child_sa->set_state(this->child_sa, CHILD_INSTALLED);
724 this->ike_sa->add_child_sa(this->ike_sa, this->child_sa);
725 this->established = TRUE;
726
727 schedule_inactivity_timeout(this);
728
729 my_ts = linked_list_create_from_enumerator(
730 this->child_sa->create_ts_enumerator(this->child_sa, TRUE));
731 other_ts = linked_list_create_from_enumerator(
732 this->child_sa->create_ts_enumerator(this->child_sa, FALSE));
733
734 DBG0(DBG_IKE, "CHILD_SA %s{%d} established "
735 "with SPIs %.8x_i %.8x_o and TS %#R === %#R",
736 this->child_sa->get_name(this->child_sa),
737 this->child_sa->get_unique_id(this->child_sa),
738 ntohl(this->child_sa->get_spi(this->child_sa, TRUE)),
739 ntohl(this->child_sa->get_spi(this->child_sa, FALSE)), my_ts, other_ts);
740
741 my_ts->destroy(my_ts);
742 other_ts->destroy(other_ts);
743
744 return SUCCESS;
745 }
746
747 /**
748 * build the payloads for the message
749 */
750 static bool build_payloads(private_child_create_t *this, message_t *message)
751 {
752 sa_payload_t *sa_payload;
753 nonce_payload_t *nonce_payload;
754 ke_payload_t *ke_payload;
755 ts_payload_t *ts_payload;
756 kernel_feature_t features;
757
758 /* add SA payload */
759 if (this->initiator)
760 {
761 sa_payload = sa_payload_create_from_proposals_v2(this->proposals);
762 }
763 else
764 {
765 sa_payload = sa_payload_create_from_proposal_v2(this->proposal);
766 }
767 message->add_payload(message, (payload_t*)sa_payload);
768
769 /* add nonce payload if not in IKE_AUTH */
770 if (message->get_exchange_type(message) == CREATE_CHILD_SA)
771 {
772 nonce_payload = nonce_payload_create(PLV2_NONCE);
773 nonce_payload->set_nonce(nonce_payload, this->my_nonce);
774 message->add_payload(message, (payload_t*)nonce_payload);
775 }
776
777 /* diffie hellman exchange, if PFS enabled */
778 if (this->dh)
779 {
780 ke_payload = ke_payload_create_from_diffie_hellman(PLV2_KEY_EXCHANGE,
781 this->dh);
782 if (!ke_payload)
783 {
784 DBG1(DBG_IKE, "creating KE payload failed");
785 return FALSE;
786 }
787 message->add_payload(message, (payload_t*)ke_payload);
788 }
789
790 /* add TSi/TSr payloads */
791 ts_payload = ts_payload_create_from_traffic_selectors(TRUE, this->tsi);
792 message->add_payload(message, (payload_t*)ts_payload);
793 ts_payload = ts_payload_create_from_traffic_selectors(FALSE, this->tsr);
794 message->add_payload(message, (payload_t*)ts_payload);
795
796 /* add a notify if we are not in tunnel mode */
797 switch (this->mode)
798 {
799 case MODE_TRANSPORT:
800 message->add_notify(message, FALSE, USE_TRANSPORT_MODE, chunk_empty);
801 break;
802 case MODE_BEET:
803 message->add_notify(message, FALSE, USE_BEET_MODE, chunk_empty);
804 break;
805 default:
806 break;
807 }
808
809 features = charon->kernel->get_features(charon->kernel);
810 if (!(features & KERNEL_ESP_V3_TFC))
811 {
812 message->add_notify(message, FALSE, ESP_TFC_PADDING_NOT_SUPPORTED,
813 chunk_empty);
814 }
815 return TRUE;
816 }
817
818 /**
819 * Adds an IPCOMP_SUPPORTED notify to the message, allocating a CPI
820 */
821 static void add_ipcomp_notify(private_child_create_t *this,
822 message_t *message, uint8_t ipcomp)
823 {
824 this->my_cpi = this->child_sa->alloc_cpi(this->child_sa);
825 if (this->my_cpi)
826 {
827 this->ipcomp = ipcomp;
828 message->add_notify(message, FALSE, IPCOMP_SUPPORTED,
829 chunk_cata("cc", chunk_from_thing(this->my_cpi),
830 chunk_from_thing(ipcomp)));
831 }
832 else
833 {
834 DBG1(DBG_IKE, "unable to allocate a CPI from kernel, IPComp disabled");
835 }
836 }
837
838 /**
839 * handle a received notify payload
840 */
841 static void handle_notify(private_child_create_t *this, notify_payload_t *notify)
842 {
843 switch (notify->get_notify_type(notify))
844 {
845 case USE_TRANSPORT_MODE:
846 this->mode = MODE_TRANSPORT;
847 break;
848 case USE_BEET_MODE:
849 if (this->ike_sa->supports_extension(this->ike_sa, EXT_STRONGSWAN))
850 { /* handle private use notify only if we know its meaning */
851 this->mode = MODE_BEET;
852 }
853 else
854 {
855 DBG1(DBG_IKE, "received a notify strongSwan uses for BEET "
856 "mode, but peer implementation unknown, skipped");
857 }
858 break;
859 case IPCOMP_SUPPORTED:
860 {
861 ipcomp_transform_t ipcomp;
862 uint16_t cpi;
863 chunk_t data;
864
865 data = notify->get_notification_data(notify);
866 cpi = *(uint16_t*)data.ptr;
867 ipcomp = (ipcomp_transform_t)(*(data.ptr + 2));
868 switch (ipcomp)
869 {
870 case IPCOMP_DEFLATE:
871 this->other_cpi = cpi;
872 this->ipcomp_received = ipcomp;
873 break;
874 case IPCOMP_LZS:
875 case IPCOMP_LZJH:
876 default:
877 DBG1(DBG_IKE, "received IPCOMP_SUPPORTED notify with a "
878 "transform ID we don't support %N",
879 ipcomp_transform_names, ipcomp);
880 break;
881 }
882 break;
883 }
884 case ESP_TFC_PADDING_NOT_SUPPORTED:
885 DBG1(DBG_IKE, "received %N, not using ESPv3 TFC padding",
886 notify_type_names, notify->get_notify_type(notify));
887 this->tfcv3 = FALSE;
888 break;
889 default:
890 break;
891 }
892 }
893
894 /**
895 * Read payloads from message
896 */
897 static void process_payloads(private_child_create_t *this, message_t *message)
898 {
899 enumerator_t *enumerator;
900 payload_t *payload;
901 sa_payload_t *sa_payload;
902 ke_payload_t *ke_payload;
903 ts_payload_t *ts_payload;
904
905 /* defaults to TUNNEL mode */
906 this->mode = MODE_TUNNEL;
907
908 enumerator = message->create_payload_enumerator(message);
909 while (enumerator->enumerate(enumerator, &payload))
910 {
911 switch (payload->get_type(payload))
912 {
913 case PLV2_SECURITY_ASSOCIATION:
914 sa_payload = (sa_payload_t*)payload;
915 this->proposals = sa_payload->get_proposals(sa_payload);
916 break;
917 case PLV2_KEY_EXCHANGE:
918 ke_payload = (ke_payload_t*)payload;
919 if (!this->initiator)
920 {
921 this->dh_group = ke_payload->get_dh_group_number(ke_payload);
922 this->dh = this->keymat->keymat.create_dh(
923 &this->keymat->keymat, this->dh_group);
924 }
925 if (this->dh)
926 {
927 this->dh_failed = !this->dh->set_other_public_value(this->dh,
928 ke_payload->get_key_exchange_data(ke_payload));
929 }
930 break;
931 case PLV2_TS_INITIATOR:
932 ts_payload = (ts_payload_t*)payload;
933 this->tsi = ts_payload->get_traffic_selectors(ts_payload);
934 break;
935 case PLV2_TS_RESPONDER:
936 ts_payload = (ts_payload_t*)payload;
937 this->tsr = ts_payload->get_traffic_selectors(ts_payload);
938 break;
939 case PLV2_NOTIFY:
940 handle_notify(this, (notify_payload_t*)payload);
941 break;
942 default:
943 break;
944 }
945 }
946 enumerator->destroy(enumerator);
947 }
948
949 METHOD(task_t, build_i, status_t,
950 private_child_create_t *this, message_t *message)
951 {
952 enumerator_t *enumerator;
953 host_t *vip;
954 peer_cfg_t *peer_cfg;
955 linked_list_t *list;
956
957 switch (message->get_exchange_type(message))
958 {
959 case IKE_SA_INIT:
960 return get_nonce(message, &this->my_nonce);
961 case CREATE_CHILD_SA:
962 if (!generate_nonce(this))
963 {
964 message->add_notify(message, FALSE, NO_PROPOSAL_CHOSEN,
965 chunk_empty);
966 return SUCCESS;
967 }
968 if (!this->retry)
969 {
970 this->dh_group = this->config->get_dh_group(this->config);
971 }
972 break;
973 case IKE_AUTH:
974 if (message->get_message_id(message) != 1)
975 {
976 /* send only in the first request, not in subsequent rounds */
977 return NEED_MORE;
978 }
979 break;
980 default:
981 break;
982 }
983
984 if (this->reqid)
985 {
986 DBG0(DBG_IKE, "establishing CHILD_SA %s{%d}",
987 this->config->get_name(this->config), this->reqid);
988 }
989 else
990 {
991 DBG0(DBG_IKE, "establishing CHILD_SA %s",
992 this->config->get_name(this->config));
993 }
994
995 /* check if we want a virtual IP, but don't have one */
996 list = linked_list_create();
997 peer_cfg = this->ike_sa->get_peer_cfg(this->ike_sa);
998 if (!this->rekey)
999 {
1000 enumerator = peer_cfg->create_virtual_ip_enumerator(peer_cfg);
1001 while (enumerator->enumerate(enumerator, &vip))
1002 {
1003 /* propose a 0.0.0.0/0 or ::/0 subnet when we use virtual ip */
1004 vip = host_create_any(vip->get_family(vip));
1005 list->insert_last(list, vip);
1006 }
1007 enumerator->destroy(enumerator);
1008 }
1009 if (list->get_count(list))
1010 {
1011 this->tsi = this->config->get_traffic_selectors(this->config,
1012 TRUE, NULL, list);
1013 list->destroy_offset(list, offsetof(host_t, destroy));
1014 }
1015 else
1016 { /* no virtual IPs configured */
1017 list->destroy(list);
1018 list = get_dynamic_hosts(this->ike_sa, TRUE);
1019 this->tsi = this->config->get_traffic_selectors(this->config,
1020 TRUE, NULL, list);
1021 list->destroy(list);
1022 }
1023 list = get_dynamic_hosts(this->ike_sa, FALSE);
1024 this->tsr = this->config->get_traffic_selectors(this->config,
1025 FALSE, NULL, list);
1026 list->destroy(list);
1027
1028 if (this->packet_tsi)
1029 {
1030 this->tsi->insert_first(this->tsi,
1031 this->packet_tsi->clone(this->packet_tsi));
1032 }
1033 if (this->packet_tsr)
1034 {
1035 this->tsr->insert_first(this->tsr,
1036 this->packet_tsr->clone(this->packet_tsr));
1037 }
1038 this->proposals = this->config->get_proposals(this->config,
1039 this->dh_group == MODP_NONE);
1040 this->mode = this->config->get_mode(this->config);
1041
1042 this->child_sa = child_sa_create(this->ike_sa->get_my_host(this->ike_sa),
1043 this->ike_sa->get_other_host(this->ike_sa), this->config, this->reqid,
1044 this->ike_sa->has_condition(this->ike_sa, COND_NAT_ANY),
1045 this->mark_in, this->mark_out);
1046
1047 if (!allocate_spi(this))
1048 {
1049 DBG1(DBG_IKE, "unable to allocate SPIs from kernel");
1050 return FAILED;
1051 }
1052
1053 if (this->dh_group != MODP_NONE)
1054 {
1055 this->dh = this->keymat->keymat.create_dh(&this->keymat->keymat,
1056 this->dh_group);
1057 }
1058
1059 if (this->config->use_ipcomp(this->config))
1060 {
1061 /* IPCOMP_DEFLATE is the only transform we support at the moment */
1062 add_ipcomp_notify(this, message, IPCOMP_DEFLATE);
1063 }
1064
1065 if (message->get_exchange_type(message) == IKE_AUTH)
1066 {
1067 charon->bus->narrow(charon->bus, this->child_sa,
1068 NARROW_INITIATOR_PRE_NOAUTH, this->tsi, this->tsr);
1069 }
1070 else
1071 {
1072 charon->bus->narrow(charon->bus, this->child_sa,
1073 NARROW_INITIATOR_PRE_AUTH, this->tsi, this->tsr);
1074 }
1075
1076 if (!build_payloads(this, message))
1077 {
1078 return FAILED;
1079 }
1080
1081 this->tsi->destroy_offset(this->tsi, offsetof(traffic_selector_t, destroy));
1082 this->tsr->destroy_offset(this->tsr, offsetof(traffic_selector_t, destroy));
1083 this->proposals->destroy_offset(this->proposals, offsetof(proposal_t, destroy));
1084 this->tsi = NULL;
1085 this->tsr = NULL;
1086 this->proposals = NULL;
1087
1088 return NEED_MORE;
1089 }
1090
1091 METHOD(task_t, process_r, status_t,
1092 private_child_create_t *this, message_t *message)
1093 {
1094 switch (message->get_exchange_type(message))
1095 {
1096 case IKE_SA_INIT:
1097 return get_nonce(message, &this->other_nonce);
1098 case CREATE_CHILD_SA:
1099 get_nonce(message, &this->other_nonce);
1100 break;
1101 case IKE_AUTH:
1102 if (message->get_message_id(message) != 1)
1103 {
1104 /* only handle first AUTH payload, not additional rounds */
1105 return NEED_MORE;
1106 }
1107 default:
1108 break;
1109 }
1110
1111 process_payloads(this, message);
1112
1113 return NEED_MORE;
1114 }
1115
1116 /**
1117 * handle CHILD_SA setup failure
1118 */
1119 static void handle_child_sa_failure(private_child_create_t *this,
1120 message_t *message)
1121 {
1122 bool is_first;
1123
1124 is_first = message->get_exchange_type(message) == IKE_AUTH;
1125 if (is_first &&
1126 lib->settings->get_bool(lib->settings,
1127 "%s.close_ike_on_child_failure", FALSE, lib->ns))
1128 {
1129 /* we delay the delete for 100ms, as the IKE_AUTH response must arrive
1130 * first */
1131 DBG1(DBG_IKE, "closing IKE_SA due CHILD_SA setup failure");
1132 lib->scheduler->schedule_job_ms(lib->scheduler, (job_t*)
1133 delete_ike_sa_job_create(this->ike_sa->get_id(this->ike_sa), TRUE),
1134 100);
1135 }
1136 else
1137 {
1138 DBG1(DBG_IKE, "failed to establish CHILD_SA, keeping IKE_SA");
1139 charon->bus->alert(charon->bus, ALERT_KEEP_ON_CHILD_SA_FAILURE,
1140 is_first);
1141 }
1142 }
1143
1144 /**
1145 * Substitute transport mode NAT selectors, if applicable
1146 */
1147 static linked_list_t* get_ts_if_nat_transport(private_child_create_t *this,
1148 bool local, linked_list_t *in)
1149 {
1150 linked_list_t *out = NULL;
1151 ike_condition_t cond;
1152
1153 if (this->mode == MODE_TRANSPORT)
1154 {
1155 cond = local ? COND_NAT_HERE : COND_NAT_THERE;
1156 if (this->ike_sa->has_condition(this->ike_sa, cond))
1157 {
1158 out = get_transport_nat_ts(this, local, in);
1159 if (out->get_count(out) == 0)
1160 {
1161 out->destroy(out);
1162 out = NULL;
1163 }
1164 }
1165 }
1166 return out;
1167 }
1168
1169 /**
1170 * Select a matching CHILD config as responder
1171 */
1172 static child_cfg_t* select_child_cfg(private_child_create_t *this)
1173 {
1174 peer_cfg_t *peer_cfg;
1175 child_cfg_t *child_cfg = NULL;;
1176
1177 peer_cfg = this->ike_sa->get_peer_cfg(this->ike_sa);
1178 if (peer_cfg && this->tsi && this->tsr)
1179 {
1180 linked_list_t *listr, *listi, *tsr, *tsi;
1181
1182 tsr = get_ts_if_nat_transport(this, TRUE, this->tsr);
1183 tsi = get_ts_if_nat_transport(this, FALSE, this->tsi);
1184
1185 listr = get_dynamic_hosts(this->ike_sa, TRUE);
1186 listi = get_dynamic_hosts(this->ike_sa, FALSE);
1187 child_cfg = peer_cfg->select_child_cfg(peer_cfg,
1188 tsr ?: this->tsr, tsi ?: this->tsi,
1189 listr, listi);
1190 if ((tsi || tsr) && child_cfg &&
1191 child_cfg->get_mode(child_cfg) != MODE_TRANSPORT)
1192 {
1193 /* found a CHILD config, but it doesn't use transport mode */
1194 child_cfg->destroy(child_cfg);
1195 child_cfg = NULL;
1196 }
1197 if (!child_cfg && (tsi || tsr))
1198 {
1199 /* no match for the substituted NAT selectors, try it without */
1200 child_cfg = peer_cfg->select_child_cfg(peer_cfg,
1201 this->tsr, this->tsi, listr, listi);
1202 }
1203 listr->destroy(listr);
1204 listi->destroy(listi);
1205 DESTROY_OFFSET_IF(tsi, offsetof(traffic_selector_t, destroy));
1206 DESTROY_OFFSET_IF(tsr, offsetof(traffic_selector_t, destroy));
1207 }
1208
1209 return child_cfg;
1210 }
1211
1212 METHOD(task_t, build_r, status_t,
1213 private_child_create_t *this, message_t *message)
1214 {
1215 payload_t *payload;
1216 enumerator_t *enumerator;
1217 bool no_dh = TRUE, ike_auth = FALSE;
1218
1219 switch (message->get_exchange_type(message))
1220 {
1221 case IKE_SA_INIT:
1222 return get_nonce(message, &this->my_nonce);
1223 case CREATE_CHILD_SA:
1224 if (!generate_nonce(this))
1225 {
1226 message->add_notify(message, FALSE, NO_PROPOSAL_CHOSEN,
1227 chunk_empty);
1228 return SUCCESS;
1229 }
1230 if (this->dh_failed)
1231 {
1232 DBG1(DBG_IKE, "applying DH public value failed");
1233 message->add_notify(message, FALSE, NO_PROPOSAL_CHOSEN,
1234 chunk_empty);
1235 return SUCCESS;
1236 }
1237 no_dh = FALSE;
1238 break;
1239 case IKE_AUTH:
1240 if (this->ike_sa->get_state(this->ike_sa) != IKE_ESTABLISHED)
1241 { /* wait until all authentication round completed */
1242 return NEED_MORE;
1243 }
1244 if (this->ike_sa->has_condition(this->ike_sa, COND_REDIRECTED))
1245 { /* no CHILD_SA is created for redirected SAs */
1246 return SUCCESS;
1247 }
1248 ike_auth = TRUE;
1249 default:
1250 break;
1251 }
1252
1253 if (this->ike_sa->get_state(this->ike_sa) == IKE_REKEYING)
1254 {
1255 DBG1(DBG_IKE, "unable to create CHILD_SA while rekeying IKE_SA");
1256 message->add_notify(message, TRUE, TEMPORARY_FAILURE, chunk_empty);
1257 return SUCCESS;
1258 }
1259 if (this->ike_sa->get_state(this->ike_sa) == IKE_DELETING)
1260 {
1261 DBG1(DBG_IKE, "unable to create CHILD_SA while deleting IKE_SA");
1262 message->add_notify(message, TRUE, TEMPORARY_FAILURE, chunk_empty);
1263 return SUCCESS;
1264 }
1265
1266 if (this->config == NULL)
1267 {
1268 this->config = select_child_cfg(this);
1269 }
1270 if (this->config == NULL)
1271 {
1272 DBG1(DBG_IKE, "traffic selectors %#R === %#R inacceptable",
1273 this->tsr, this->tsi);
1274 charon->bus->alert(charon->bus, ALERT_TS_MISMATCH, this->tsi, this->tsr);
1275 message->add_notify(message, FALSE, TS_UNACCEPTABLE, chunk_empty);
1276 handle_child_sa_failure(this, message);
1277 return SUCCESS;
1278 }
1279
1280 /* check if ike_config_t included non-critical error notifies */
1281 enumerator = message->create_payload_enumerator(message);
1282 while (enumerator->enumerate(enumerator, &payload))
1283 {
1284 if (payload->get_type(payload) == PLV2_NOTIFY)
1285 {
1286 notify_payload_t *notify = (notify_payload_t*)payload;
1287
1288 switch (notify->get_notify_type(notify))
1289 {
1290 case INTERNAL_ADDRESS_FAILURE:
1291 case FAILED_CP_REQUIRED:
1292 {
1293 DBG1(DBG_IKE,"configuration payload negotiation "
1294 "failed, no CHILD_SA built");
1295 enumerator->destroy(enumerator);
1296 handle_child_sa_failure(this, message);
1297 return SUCCESS;
1298 }
1299 default:
1300 break;
1301 }
1302 }
1303 }
1304 enumerator->destroy(enumerator);
1305
1306 this->child_sa = child_sa_create(this->ike_sa->get_my_host(this->ike_sa),
1307 this->ike_sa->get_other_host(this->ike_sa), this->config, this->reqid,
1308 this->ike_sa->has_condition(this->ike_sa, COND_NAT_ANY),
1309 this->mark_in, this->mark_out);
1310
1311 if (this->ipcomp_received != IPCOMP_NONE)
1312 {
1313 if (this->config->use_ipcomp(this->config))
1314 {
1315 add_ipcomp_notify(this, message, this->ipcomp_received);
1316 }
1317 else
1318 {
1319 DBG1(DBG_IKE, "received %N notify but IPComp is disabled, ignoring",
1320 notify_type_names, IPCOMP_SUPPORTED);
1321 }
1322 }
1323
1324 switch (select_and_install(this, no_dh, ike_auth))
1325 {
1326 case SUCCESS:
1327 break;
1328 case NOT_FOUND:
1329 message->add_notify(message, FALSE, TS_UNACCEPTABLE, chunk_empty);
1330 handle_child_sa_failure(this, message);
1331 return SUCCESS;
1332 case INVALID_ARG:
1333 {
1334 uint16_t group = htons(this->dh_group);
1335 message->add_notify(message, FALSE, INVALID_KE_PAYLOAD,
1336 chunk_from_thing(group));
1337 handle_child_sa_failure(this, message);
1338 return SUCCESS;
1339 }
1340 case FAILED:
1341 default:
1342 message->add_notify(message, FALSE, NO_PROPOSAL_CHOSEN, chunk_empty);
1343 handle_child_sa_failure(this, message);
1344 return SUCCESS;
1345 }
1346
1347 if (!build_payloads(this, message))
1348 {
1349 message->add_notify(message, FALSE, NO_PROPOSAL_CHOSEN, chunk_empty);
1350 handle_child_sa_failure(this, message);
1351 return SUCCESS;
1352 }
1353
1354 if (!this->rekey)
1355 { /* invoke the child_up() hook if we are not rekeying */
1356 charon->bus->child_updown(charon->bus, this->child_sa, TRUE);
1357 }
1358 return SUCCESS;
1359 }
1360
1361 /**
1362 * Raise alerts for received notify errors
1363 */
1364 static void raise_alerts(private_child_create_t *this, notify_type_t type)
1365 {
1366 linked_list_t *list;
1367
1368 switch (type)
1369 {
1370 case NO_PROPOSAL_CHOSEN:
1371 list = this->config->get_proposals(this->config, FALSE);
1372 charon->bus->alert(charon->bus, ALERT_PROPOSAL_MISMATCH_CHILD, list);
1373 list->destroy_offset(list, offsetof(proposal_t, destroy));
1374 break;
1375 default:
1376 break;
1377 }
1378 }
1379
1380 METHOD(task_t, build_i_delete, status_t,
1381 private_child_create_t *this, message_t *message)
1382 {
1383 message->set_exchange_type(message, INFORMATIONAL);
1384 if (this->my_spi && this->proto)
1385 {
1386 delete_payload_t *del;
1387
1388 del = delete_payload_create(PLV2_DELETE, this->proto);
1389 del->add_spi(del, this->my_spi);
1390 message->add_payload(message, (payload_t*)del);
1391
1392 DBG1(DBG_IKE, "sending DELETE for %N CHILD_SA with SPI %.8x",
1393 protocol_id_names, this->proto, ntohl(this->my_spi));
1394 }
1395 return NEED_MORE;
1396 }
1397
1398 /**
1399 * Change task to delete the failed CHILD_SA as initiator
1400 */
1401 static status_t delete_failed_sa(private_child_create_t *this)
1402 {
1403 if (this->my_spi && this->proto)
1404 {
1405 this->public.task.build = _build_i_delete;
1406 this->public.task.process = (void*)return_success;
1407 return NEED_MORE;
1408 }
1409 return SUCCESS;
1410 }
1411
1412 METHOD(task_t, process_i, status_t,
1413 private_child_create_t *this, message_t *message)
1414 {
1415 enumerator_t *enumerator;
1416 payload_t *payload;
1417 bool no_dh = TRUE, ike_auth = FALSE;
1418
1419 switch (message->get_exchange_type(message))
1420 {
1421 case IKE_SA_INIT:
1422 return get_nonce(message, &this->other_nonce);
1423 case CREATE_CHILD_SA:
1424 get_nonce(message, &this->other_nonce);
1425 no_dh = FALSE;
1426 break;
1427 case IKE_AUTH:
1428 if (this->ike_sa->get_state(this->ike_sa) != IKE_ESTABLISHED)
1429 { /* wait until all authentication round completed */
1430 return NEED_MORE;
1431 }
1432 ike_auth = TRUE;
1433 default:
1434 break;
1435 }
1436
1437 /* check for erroneous notifies */
1438 enumerator = message->create_payload_enumerator(message);
1439 while (enumerator->enumerate(enumerator, &payload))
1440 {
1441 if (payload->get_type(payload) == PLV2_NOTIFY)
1442 {
1443 notify_payload_t *notify = (notify_payload_t*)payload;
1444 notify_type_t type = notify->get_notify_type(notify);
1445
1446 switch (type)
1447 {
1448 /* handle notify errors related to CHILD_SA only */
1449 case NO_PROPOSAL_CHOSEN:
1450 case SINGLE_PAIR_REQUIRED:
1451 case NO_ADDITIONAL_SAS:
1452 case INTERNAL_ADDRESS_FAILURE:
1453 case FAILED_CP_REQUIRED:
1454 case TS_UNACCEPTABLE:
1455 case INVALID_SELECTORS:
1456 {
1457 DBG1(DBG_IKE, "received %N notify, no CHILD_SA built",
1458 notify_type_names, type);
1459 enumerator->destroy(enumerator);
1460 raise_alerts(this, type);
1461 handle_child_sa_failure(this, message);
1462 /* an error in CHILD_SA creation is not critical */
1463 return SUCCESS;
1464 }
1465 case TEMPORARY_FAILURE:
1466 {
1467 DBG1(DBG_IKE, "received %N notify, will retry later",
1468 notify_type_names, type);
1469 enumerator->destroy(enumerator);
1470 if (!this->rekey)
1471 { /* the rekey task will retry itself if necessary */
1472 schedule_delayed_retry(this);
1473 }
1474 return SUCCESS;
1475 }
1476 case INVALID_KE_PAYLOAD:
1477 {
1478 chunk_t data;
1479 uint16_t group = MODP_NONE;
1480
1481 data = notify->get_notification_data(notify);
1482 if (data.len == sizeof(group))
1483 {
1484 memcpy(&group, data.ptr, data.len);
1485 group = ntohs(group);
1486 }
1487 DBG1(DBG_IKE, "peer didn't accept DH group %N, "
1488 "it requested %N", diffie_hellman_group_names,
1489 this->dh_group, diffie_hellman_group_names, group);
1490 this->retry = TRUE;
1491 this->dh_group = group;
1492 this->child_sa->set_state(this->child_sa, CHILD_RETRYING);
1493 this->public.task.migrate(&this->public.task, this->ike_sa);
1494 enumerator->destroy(enumerator);
1495 return NEED_MORE;
1496 }
1497 default:
1498 {
1499 if (message->get_exchange_type(message) == CREATE_CHILD_SA)
1500 { /* handle notifies if not handled in IKE_AUTH */
1501 if (type <= 16383)
1502 {
1503 DBG1(DBG_IKE, "received %N notify error",
1504 notify_type_names, type);
1505 enumerator->destroy(enumerator);
1506 return SUCCESS;
1507 }
1508 DBG2(DBG_IKE, "received %N notify",
1509 notify_type_names, type);
1510 }
1511 break;
1512 }
1513 }
1514 }
1515 }
1516 enumerator->destroy(enumerator);
1517
1518 process_payloads(this, message);
1519
1520 if (this->ipcomp == IPCOMP_NONE && this->ipcomp_received != IPCOMP_NONE)
1521 {
1522 DBG1(DBG_IKE, "received an IPCOMP_SUPPORTED notify without requesting"
1523 " one, no CHILD_SA built");
1524 handle_child_sa_failure(this, message);
1525 return delete_failed_sa(this);
1526 }
1527 else if (this->ipcomp != IPCOMP_NONE && this->ipcomp_received == IPCOMP_NONE)
1528 {
1529 DBG1(DBG_IKE, "peer didn't accept our proposed IPComp transforms, "
1530 "IPComp is disabled");
1531 this->ipcomp = IPCOMP_NONE;
1532 }
1533 else if (this->ipcomp != IPCOMP_NONE && this->ipcomp != this->ipcomp_received)
1534 {
1535 DBG1(DBG_IKE, "received an IPCOMP_SUPPORTED notify we didn't propose, "
1536 "no CHILD_SA built");
1537 handle_child_sa_failure(this, message);
1538 return delete_failed_sa(this);
1539 }
1540
1541 if (this->dh_failed)
1542 {
1543 DBG1(DBG_IKE, "applying DH public value failed");
1544 handle_child_sa_failure(this, message);
1545 return delete_failed_sa(this);
1546 }
1547
1548 if (select_and_install(this, no_dh, ike_auth) == SUCCESS)
1549 {
1550 if (!this->rekey)
1551 { /* invoke the child_up() hook if we are not rekeying */
1552 charon->bus->child_updown(charon->bus, this->child_sa, TRUE);
1553 }
1554 }
1555 else
1556 {
1557 handle_child_sa_failure(this, message);
1558 return delete_failed_sa(this);
1559 }
1560 return SUCCESS;
1561 }
1562
1563 METHOD(child_create_t, use_reqid, void,
1564 private_child_create_t *this, uint32_t reqid)
1565 {
1566 this->reqid = reqid;
1567 }
1568
1569 METHOD(child_create_t, use_marks, void,
1570 private_child_create_t *this, u_int in, u_int out)
1571 {
1572 this->mark_in = in;
1573 this->mark_out = out;
1574 }
1575
1576 METHOD(child_create_t, get_child, child_sa_t*,
1577 private_child_create_t *this)
1578 {
1579 return this->child_sa;
1580 }
1581
1582 METHOD(child_create_t, set_config, void,
1583 private_child_create_t *this, child_cfg_t *cfg)
1584 {
1585 DESTROY_IF(this->config);
1586 this->config = cfg;
1587 }
1588
1589 METHOD(child_create_t, get_lower_nonce, chunk_t,
1590 private_child_create_t *this)
1591 {
1592 if (memcmp(this->my_nonce.ptr, this->other_nonce.ptr,
1593 min(this->my_nonce.len, this->other_nonce.len)) < 0)
1594 {
1595 return this->my_nonce;
1596 }
1597 else
1598 {
1599 return this->other_nonce;
1600 }
1601 }
1602
1603 METHOD(task_t, get_type, task_type_t,
1604 private_child_create_t *this)
1605 {
1606 return TASK_CHILD_CREATE;
1607 }
1608
1609 METHOD(task_t, migrate, void,
1610 private_child_create_t *this, ike_sa_t *ike_sa)
1611 {
1612 chunk_free(&this->my_nonce);
1613 chunk_free(&this->other_nonce);
1614 if (this->tsr)
1615 {
1616 this->tsr->destroy_offset(this->tsr, offsetof(traffic_selector_t, destroy));
1617 }
1618 if (this->tsi)
1619 {
1620 this->tsi->destroy_offset(this->tsi, offsetof(traffic_selector_t, destroy));
1621 }
1622 DESTROY_IF(this->child_sa);
1623 DESTROY_IF(this->proposal);
1624 DESTROY_IF(this->nonceg);
1625 DESTROY_IF(this->dh);
1626 this->dh_failed = FALSE;
1627 if (this->proposals)
1628 {
1629 this->proposals->destroy_offset(this->proposals, offsetof(proposal_t, destroy));
1630 }
1631
1632 this->ike_sa = ike_sa;
1633 this->keymat = (keymat_v2_t*)ike_sa->get_keymat(ike_sa);
1634 this->proposal = NULL;
1635 this->proposals = NULL;
1636 this->tsi = NULL;
1637 this->tsr = NULL;
1638 this->dh = NULL;
1639 this->nonceg = NULL;
1640 this->child_sa = NULL;
1641 this->mode = MODE_TUNNEL;
1642 this->ipcomp = IPCOMP_NONE;
1643 this->ipcomp_received = IPCOMP_NONE;
1644 this->other_cpi = 0;
1645 this->reqid = 0;
1646 this->mark_in = 0;
1647 this->mark_out = 0;
1648 this->established = FALSE;
1649 }
1650
1651 METHOD(task_t, destroy, void,
1652 private_child_create_t *this)
1653 {
1654 chunk_free(&this->my_nonce);
1655 chunk_free(&this->other_nonce);
1656 if (this->tsr)
1657 {
1658 this->tsr->destroy_offset(this->tsr, offsetof(traffic_selector_t, destroy));
1659 }
1660 if (this->tsi)
1661 {
1662 this->tsi->destroy_offset(this->tsi, offsetof(traffic_selector_t, destroy));
1663 }
1664 if (!this->established)
1665 {
1666 DESTROY_IF(this->child_sa);
1667 }
1668 DESTROY_IF(this->packet_tsi);
1669 DESTROY_IF(this->packet_tsr);
1670 DESTROY_IF(this->proposal);
1671 DESTROY_IF(this->dh);
1672 if (this->proposals)
1673 {
1674 this->proposals->destroy_offset(this->proposals, offsetof(proposal_t, destroy));
1675 }
1676
1677 DESTROY_IF(this->config);
1678 DESTROY_IF(this->nonceg);
1679 free(this);
1680 }
1681
1682 /*
1683 * Described in header.
1684 */
1685 child_create_t *child_create_create(ike_sa_t *ike_sa,
1686 child_cfg_t *config, bool rekey,
1687 traffic_selector_t *tsi, traffic_selector_t *tsr)
1688 {
1689 private_child_create_t *this;
1690
1691 INIT(this,
1692 .public = {
1693 .get_child = _get_child,
1694 .set_config = _set_config,
1695 .get_lower_nonce = _get_lower_nonce,
1696 .use_reqid = _use_reqid,
1697 .use_marks = _use_marks,
1698 .task = {
1699 .get_type = _get_type,
1700 .migrate = _migrate,
1701 .destroy = _destroy,
1702 },
1703 },
1704 .ike_sa = ike_sa,
1705 .config = config,
1706 .packet_tsi = tsi ? tsi->clone(tsi) : NULL,
1707 .packet_tsr = tsr ? tsr->clone(tsr) : NULL,
1708 .dh_group = MODP_NONE,
1709 .keymat = (keymat_v2_t*)ike_sa->get_keymat(ike_sa),
1710 .mode = MODE_TUNNEL,
1711 .tfcv3 = TRUE,
1712 .ipcomp = IPCOMP_NONE,
1713 .ipcomp_received = IPCOMP_NONE,
1714 .rekey = rekey,
1715 .retry = FALSE,
1716 );
1717
1718 if (config)
1719 {
1720 this->public.task.build = _build_i;
1721 this->public.task.process = _process_i;
1722 this->initiator = TRUE;
1723 }
1724 else
1725 {
1726 this->public.task.build = _build_r;
1727 this->public.task.process = _process_r;
1728 this->initiator = FALSE;
1729 }
1730 return &this->public;
1731 }