d4d05c9c1cec65fe7f0e83d21951e06367ce5df4
[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
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 }
695
696 if (status_i != SUCCESS || status_o != SUCCESS)
697 {
698 DBG1(DBG_IKE, "unable to install %s%s%sIPsec SA (SAD) in kernel",
699 (status_i != SUCCESS) ? "inbound " : "",
700 (status_i != SUCCESS && status_o != SUCCESS) ? "and ": "",
701 (status_o != SUCCESS) ? "outbound " : "");
702 charon->bus->alert(charon->bus, ALERT_INSTALL_CHILD_SA_FAILED,
703 this->child_sa);
704 status = FAILED;
705 }
706 else
707 {
708 status = this->child_sa->install_policies(this->child_sa);
709
710 if (status != SUCCESS)
711 {
712 DBG1(DBG_IKE, "unable to install IPsec policies (SPD) in kernel");
713 charon->bus->alert(charon->bus, ALERT_INSTALL_CHILD_POLICY_FAILED,
714 this->child_sa);
715 status = NOT_FOUND;
716 }
717 else
718 {
719 charon->bus->child_derived_keys(charon->bus, this->child_sa,
720 this->initiator, encr_i, encr_r,
721 integ_i, integ_r);
722 }
723 }
724 chunk_clear(&integ_i);
725 chunk_clear(&integ_r);
726 chunk_clear(&encr_i);
727 chunk_clear(&encr_r);
728
729 if (status != SUCCESS)
730 {
731 return status;
732 }
733
734 charon->bus->child_keys(charon->bus, this->child_sa, this->initiator,
735 this->dh, nonce_i, nonce_r);
736
737 /* add to IKE_SA, and remove from task */
738 this->child_sa->set_state(this->child_sa, CHILD_INSTALLED);
739 this->ike_sa->add_child_sa(this->ike_sa, this->child_sa);
740 this->established = TRUE;
741
742 schedule_inactivity_timeout(this);
743
744 my_ts = linked_list_create_from_enumerator(
745 this->child_sa->create_ts_enumerator(this->child_sa, TRUE));
746 other_ts = linked_list_create_from_enumerator(
747 this->child_sa->create_ts_enumerator(this->child_sa, FALSE));
748
749 DBG0(DBG_IKE, "CHILD_SA %s{%d} established "
750 "with SPIs %.8x_i %.8x_o and TS %#R === %#R",
751 this->child_sa->get_name(this->child_sa),
752 this->child_sa->get_unique_id(this->child_sa),
753 ntohl(this->child_sa->get_spi(this->child_sa, TRUE)),
754 ntohl(this->child_sa->get_spi(this->child_sa, FALSE)), my_ts, other_ts);
755
756 my_ts->destroy(my_ts);
757 other_ts->destroy(other_ts);
758
759 return SUCCESS;
760 }
761
762 /**
763 * build the payloads for the message
764 */
765 static bool build_payloads(private_child_create_t *this, message_t *message)
766 {
767 sa_payload_t *sa_payload;
768 nonce_payload_t *nonce_payload;
769 ke_payload_t *ke_payload;
770 ts_payload_t *ts_payload;
771 kernel_feature_t features;
772
773 /* add SA payload */
774 if (this->initiator)
775 {
776 sa_payload = sa_payload_create_from_proposals_v2(this->proposals);
777 }
778 else
779 {
780 sa_payload = sa_payload_create_from_proposal_v2(this->proposal);
781 }
782 message->add_payload(message, (payload_t*)sa_payload);
783
784 /* add nonce payload if not in IKE_AUTH */
785 if (message->get_exchange_type(message) == CREATE_CHILD_SA)
786 {
787 nonce_payload = nonce_payload_create(PLV2_NONCE);
788 nonce_payload->set_nonce(nonce_payload, this->my_nonce);
789 message->add_payload(message, (payload_t*)nonce_payload);
790 }
791
792 /* diffie hellman exchange, if PFS enabled */
793 if (this->dh)
794 {
795 ke_payload = ke_payload_create_from_diffie_hellman(PLV2_KEY_EXCHANGE,
796 this->dh);
797 if (!ke_payload)
798 {
799 DBG1(DBG_IKE, "creating KE payload failed");
800 return FALSE;
801 }
802 message->add_payload(message, (payload_t*)ke_payload);
803 }
804
805 /* add TSi/TSr payloads */
806 ts_payload = ts_payload_create_from_traffic_selectors(TRUE, this->tsi);
807 message->add_payload(message, (payload_t*)ts_payload);
808 ts_payload = ts_payload_create_from_traffic_selectors(FALSE, this->tsr);
809 message->add_payload(message, (payload_t*)ts_payload);
810
811 /* add a notify if we are not in tunnel mode */
812 switch (this->mode)
813 {
814 case MODE_TRANSPORT:
815 message->add_notify(message, FALSE, USE_TRANSPORT_MODE, chunk_empty);
816 break;
817 case MODE_BEET:
818 message->add_notify(message, FALSE, USE_BEET_MODE, chunk_empty);
819 break;
820 default:
821 break;
822 }
823
824 features = charon->kernel->get_features(charon->kernel);
825 if (!(features & KERNEL_ESP_V3_TFC))
826 {
827 message->add_notify(message, FALSE, ESP_TFC_PADDING_NOT_SUPPORTED,
828 chunk_empty);
829 }
830 return TRUE;
831 }
832
833 /**
834 * Adds an IPCOMP_SUPPORTED notify to the message, allocating a CPI
835 */
836 static void add_ipcomp_notify(private_child_create_t *this,
837 message_t *message, uint8_t ipcomp)
838 {
839 this->my_cpi = this->child_sa->alloc_cpi(this->child_sa);
840 if (this->my_cpi)
841 {
842 this->ipcomp = ipcomp;
843 message->add_notify(message, FALSE, IPCOMP_SUPPORTED,
844 chunk_cata("cc", chunk_from_thing(this->my_cpi),
845 chunk_from_thing(ipcomp)));
846 }
847 else
848 {
849 DBG1(DBG_IKE, "unable to allocate a CPI from kernel, IPComp disabled");
850 }
851 }
852
853 /**
854 * handle a received notify payload
855 */
856 static void handle_notify(private_child_create_t *this, notify_payload_t *notify)
857 {
858 switch (notify->get_notify_type(notify))
859 {
860 case USE_TRANSPORT_MODE:
861 this->mode = MODE_TRANSPORT;
862 break;
863 case USE_BEET_MODE:
864 if (this->ike_sa->supports_extension(this->ike_sa, EXT_STRONGSWAN))
865 { /* handle private use notify only if we know its meaning */
866 this->mode = MODE_BEET;
867 }
868 else
869 {
870 DBG1(DBG_IKE, "received a notify strongSwan uses for BEET "
871 "mode, but peer implementation unknown, skipped");
872 }
873 break;
874 case IPCOMP_SUPPORTED:
875 {
876 ipcomp_transform_t ipcomp;
877 uint16_t cpi;
878 chunk_t data;
879
880 data = notify->get_notification_data(notify);
881 cpi = *(uint16_t*)data.ptr;
882 ipcomp = (ipcomp_transform_t)(*(data.ptr + 2));
883 switch (ipcomp)
884 {
885 case IPCOMP_DEFLATE:
886 this->other_cpi = cpi;
887 this->ipcomp_received = ipcomp;
888 break;
889 case IPCOMP_LZS:
890 case IPCOMP_LZJH:
891 default:
892 DBG1(DBG_IKE, "received IPCOMP_SUPPORTED notify with a "
893 "transform ID we don't support %N",
894 ipcomp_transform_names, ipcomp);
895 break;
896 }
897 break;
898 }
899 case ESP_TFC_PADDING_NOT_SUPPORTED:
900 DBG1(DBG_IKE, "received %N, not using ESPv3 TFC padding",
901 notify_type_names, notify->get_notify_type(notify));
902 this->tfcv3 = FALSE;
903 break;
904 default:
905 break;
906 }
907 }
908
909 /**
910 * Read payloads from message
911 */
912 static void process_payloads(private_child_create_t *this, message_t *message)
913 {
914 enumerator_t *enumerator;
915 payload_t *payload;
916 sa_payload_t *sa_payload;
917 ke_payload_t *ke_payload;
918 ts_payload_t *ts_payload;
919
920 /* defaults to TUNNEL mode */
921 this->mode = MODE_TUNNEL;
922
923 enumerator = message->create_payload_enumerator(message);
924 while (enumerator->enumerate(enumerator, &payload))
925 {
926 switch (payload->get_type(payload))
927 {
928 case PLV2_SECURITY_ASSOCIATION:
929 sa_payload = (sa_payload_t*)payload;
930 this->proposals = sa_payload->get_proposals(sa_payload);
931 break;
932 case PLV2_KEY_EXCHANGE:
933 ke_payload = (ke_payload_t*)payload;
934 if (!this->initiator)
935 {
936 this->dh_group = ke_payload->get_dh_group_number(ke_payload);
937 this->dh = this->keymat->keymat.create_dh(
938 &this->keymat->keymat, this->dh_group);
939 }
940 if (this->dh)
941 {
942 this->dh_failed = !this->dh->set_other_public_value(this->dh,
943 ke_payload->get_key_exchange_data(ke_payload));
944 }
945 break;
946 case PLV2_TS_INITIATOR:
947 ts_payload = (ts_payload_t*)payload;
948 this->tsi = ts_payload->get_traffic_selectors(ts_payload);
949 break;
950 case PLV2_TS_RESPONDER:
951 ts_payload = (ts_payload_t*)payload;
952 this->tsr = ts_payload->get_traffic_selectors(ts_payload);
953 break;
954 case PLV2_NOTIFY:
955 handle_notify(this, (notify_payload_t*)payload);
956 break;
957 default:
958 break;
959 }
960 }
961 enumerator->destroy(enumerator);
962 }
963
964 METHOD(task_t, build_i, status_t,
965 private_child_create_t *this, message_t *message)
966 {
967 enumerator_t *enumerator;
968 host_t *vip;
969 peer_cfg_t *peer_cfg;
970 linked_list_t *list;
971
972 switch (message->get_exchange_type(message))
973 {
974 case IKE_SA_INIT:
975 return get_nonce(message, &this->my_nonce);
976 case CREATE_CHILD_SA:
977 if (!generate_nonce(this))
978 {
979 message->add_notify(message, FALSE, NO_PROPOSAL_CHOSEN,
980 chunk_empty);
981 return SUCCESS;
982 }
983 if (!this->retry)
984 {
985 this->dh_group = this->config->get_dh_group(this->config);
986 }
987 break;
988 case IKE_AUTH:
989 if (message->get_message_id(message) != 1)
990 {
991 /* send only in the first request, not in subsequent rounds */
992 return NEED_MORE;
993 }
994 break;
995 default:
996 break;
997 }
998
999 if (this->reqid)
1000 {
1001 DBG0(DBG_IKE, "establishing CHILD_SA %s{%d}",
1002 this->config->get_name(this->config), this->reqid);
1003 }
1004 else
1005 {
1006 DBG0(DBG_IKE, "establishing CHILD_SA %s",
1007 this->config->get_name(this->config));
1008 }
1009
1010 /* check if we want a virtual IP, but don't have one */
1011 list = linked_list_create();
1012 peer_cfg = this->ike_sa->get_peer_cfg(this->ike_sa);
1013 if (!this->rekey)
1014 {
1015 enumerator = peer_cfg->create_virtual_ip_enumerator(peer_cfg);
1016 while (enumerator->enumerate(enumerator, &vip))
1017 {
1018 /* propose a 0.0.0.0/0 or ::/0 subnet when we use virtual ip */
1019 vip = host_create_any(vip->get_family(vip));
1020 list->insert_last(list, vip);
1021 }
1022 enumerator->destroy(enumerator);
1023 }
1024 if (list->get_count(list))
1025 {
1026 this->tsi = this->config->get_traffic_selectors(this->config,
1027 TRUE, NULL, list);
1028 list->destroy_offset(list, offsetof(host_t, destroy));
1029 }
1030 else
1031 { /* no virtual IPs configured */
1032 list->destroy(list);
1033 list = get_dynamic_hosts(this->ike_sa, TRUE);
1034 this->tsi = this->config->get_traffic_selectors(this->config,
1035 TRUE, NULL, list);
1036 list->destroy(list);
1037 }
1038 list = get_dynamic_hosts(this->ike_sa, FALSE);
1039 this->tsr = this->config->get_traffic_selectors(this->config,
1040 FALSE, NULL, list);
1041 list->destroy(list);
1042
1043 if (this->packet_tsi)
1044 {
1045 this->tsi->insert_first(this->tsi,
1046 this->packet_tsi->clone(this->packet_tsi));
1047 }
1048 if (this->packet_tsr)
1049 {
1050 this->tsr->insert_first(this->tsr,
1051 this->packet_tsr->clone(this->packet_tsr));
1052 }
1053 this->proposals = this->config->get_proposals(this->config,
1054 this->dh_group == MODP_NONE);
1055 this->mode = this->config->get_mode(this->config);
1056
1057 this->child_sa = child_sa_create(this->ike_sa->get_my_host(this->ike_sa),
1058 this->ike_sa->get_other_host(this->ike_sa), this->config, this->reqid,
1059 this->ike_sa->has_condition(this->ike_sa, COND_NAT_ANY),
1060 this->mark_in, this->mark_out);
1061
1062 if (!allocate_spi(this))
1063 {
1064 DBG1(DBG_IKE, "unable to allocate SPIs from kernel");
1065 return FAILED;
1066 }
1067
1068 if (this->dh_group != MODP_NONE)
1069 {
1070 this->dh = this->keymat->keymat.create_dh(&this->keymat->keymat,
1071 this->dh_group);
1072 }
1073
1074 if (this->config->has_option(this->config, OPT_IPCOMP))
1075 {
1076 /* IPCOMP_DEFLATE is the only transform we support at the moment */
1077 add_ipcomp_notify(this, message, IPCOMP_DEFLATE);
1078 }
1079
1080 if (message->get_exchange_type(message) == IKE_AUTH)
1081 {
1082 charon->bus->narrow(charon->bus, this->child_sa,
1083 NARROW_INITIATOR_PRE_NOAUTH, this->tsi, this->tsr);
1084 }
1085 else
1086 {
1087 charon->bus->narrow(charon->bus, this->child_sa,
1088 NARROW_INITIATOR_PRE_AUTH, this->tsi, this->tsr);
1089 }
1090
1091 if (!build_payloads(this, message))
1092 {
1093 return FAILED;
1094 }
1095
1096 this->tsi->destroy_offset(this->tsi, offsetof(traffic_selector_t, destroy));
1097 this->tsr->destroy_offset(this->tsr, offsetof(traffic_selector_t, destroy));
1098 this->proposals->destroy_offset(this->proposals, offsetof(proposal_t, destroy));
1099 this->tsi = NULL;
1100 this->tsr = NULL;
1101 this->proposals = NULL;
1102
1103 return NEED_MORE;
1104 }
1105
1106 METHOD(task_t, process_r, status_t,
1107 private_child_create_t *this, message_t *message)
1108 {
1109 switch (message->get_exchange_type(message))
1110 {
1111 case IKE_SA_INIT:
1112 return get_nonce(message, &this->other_nonce);
1113 case CREATE_CHILD_SA:
1114 get_nonce(message, &this->other_nonce);
1115 break;
1116 case IKE_AUTH:
1117 if (message->get_message_id(message) != 1)
1118 {
1119 /* only handle first AUTH payload, not additional rounds */
1120 return NEED_MORE;
1121 }
1122 default:
1123 break;
1124 }
1125
1126 process_payloads(this, message);
1127
1128 return NEED_MORE;
1129 }
1130
1131 /**
1132 * handle CHILD_SA setup failure
1133 */
1134 static void handle_child_sa_failure(private_child_create_t *this,
1135 message_t *message)
1136 {
1137 bool is_first;
1138
1139 is_first = message->get_exchange_type(message) == IKE_AUTH;
1140 if (is_first &&
1141 lib->settings->get_bool(lib->settings,
1142 "%s.close_ike_on_child_failure", FALSE, lib->ns))
1143 {
1144 /* we delay the delete for 100ms, as the IKE_AUTH response must arrive
1145 * first */
1146 DBG1(DBG_IKE, "closing IKE_SA due CHILD_SA setup failure");
1147 lib->scheduler->schedule_job_ms(lib->scheduler, (job_t*)
1148 delete_ike_sa_job_create(this->ike_sa->get_id(this->ike_sa), TRUE),
1149 100);
1150 }
1151 else
1152 {
1153 DBG1(DBG_IKE, "failed to establish CHILD_SA, keeping IKE_SA");
1154 charon->bus->alert(charon->bus, ALERT_KEEP_ON_CHILD_SA_FAILURE,
1155 is_first);
1156 }
1157 }
1158
1159 /**
1160 * Substitute transport mode NAT selectors, if applicable
1161 */
1162 static linked_list_t* get_ts_if_nat_transport(private_child_create_t *this,
1163 bool local, linked_list_t *in)
1164 {
1165 linked_list_t *out = NULL;
1166 ike_condition_t cond;
1167
1168 if (this->mode == MODE_TRANSPORT)
1169 {
1170 cond = local ? COND_NAT_HERE : COND_NAT_THERE;
1171 if (this->ike_sa->has_condition(this->ike_sa, cond))
1172 {
1173 out = get_transport_nat_ts(this, local, in);
1174 if (out->get_count(out) == 0)
1175 {
1176 out->destroy(out);
1177 out = NULL;
1178 }
1179 }
1180 }
1181 return out;
1182 }
1183
1184 /**
1185 * Select a matching CHILD config as responder
1186 */
1187 static child_cfg_t* select_child_cfg(private_child_create_t *this)
1188 {
1189 peer_cfg_t *peer_cfg;
1190 child_cfg_t *child_cfg = NULL;;
1191
1192 peer_cfg = this->ike_sa->get_peer_cfg(this->ike_sa);
1193 if (peer_cfg && this->tsi && this->tsr)
1194 {
1195 linked_list_t *listr, *listi, *tsr, *tsi;
1196
1197 tsr = get_ts_if_nat_transport(this, TRUE, this->tsr);
1198 tsi = get_ts_if_nat_transport(this, FALSE, this->tsi);
1199
1200 listr = get_dynamic_hosts(this->ike_sa, TRUE);
1201 listi = get_dynamic_hosts(this->ike_sa, FALSE);
1202 child_cfg = peer_cfg->select_child_cfg(peer_cfg,
1203 tsr ?: this->tsr, tsi ?: this->tsi,
1204 listr, listi);
1205 if ((tsi || tsr) && child_cfg &&
1206 child_cfg->get_mode(child_cfg) != MODE_TRANSPORT)
1207 {
1208 /* found a CHILD config, but it doesn't use transport mode */
1209 child_cfg->destroy(child_cfg);
1210 child_cfg = NULL;
1211 }
1212 if (!child_cfg && (tsi || tsr))
1213 {
1214 /* no match for the substituted NAT selectors, try it without */
1215 child_cfg = peer_cfg->select_child_cfg(peer_cfg,
1216 this->tsr, this->tsi, listr, listi);
1217 }
1218 listr->destroy(listr);
1219 listi->destroy(listi);
1220 DESTROY_OFFSET_IF(tsi, offsetof(traffic_selector_t, destroy));
1221 DESTROY_OFFSET_IF(tsr, offsetof(traffic_selector_t, destroy));
1222 }
1223
1224 return child_cfg;
1225 }
1226
1227 METHOD(task_t, build_r, status_t,
1228 private_child_create_t *this, message_t *message)
1229 {
1230 payload_t *payload;
1231 enumerator_t *enumerator;
1232 bool no_dh = TRUE, ike_auth = FALSE;
1233
1234 switch (message->get_exchange_type(message))
1235 {
1236 case IKE_SA_INIT:
1237 return get_nonce(message, &this->my_nonce);
1238 case CREATE_CHILD_SA:
1239 if (!generate_nonce(this))
1240 {
1241 message->add_notify(message, FALSE, NO_PROPOSAL_CHOSEN,
1242 chunk_empty);
1243 return SUCCESS;
1244 }
1245 if (this->dh_failed)
1246 {
1247 DBG1(DBG_IKE, "applying DH public value failed");
1248 message->add_notify(message, FALSE, NO_PROPOSAL_CHOSEN,
1249 chunk_empty);
1250 return SUCCESS;
1251 }
1252 no_dh = FALSE;
1253 break;
1254 case IKE_AUTH:
1255 if (this->ike_sa->get_state(this->ike_sa) != IKE_ESTABLISHED)
1256 { /* wait until all authentication round completed */
1257 return NEED_MORE;
1258 }
1259 if (this->ike_sa->has_condition(this->ike_sa, COND_REDIRECTED))
1260 { /* no CHILD_SA is created for redirected SAs */
1261 return SUCCESS;
1262 }
1263 ike_auth = TRUE;
1264 default:
1265 break;
1266 }
1267
1268 if (this->ike_sa->get_state(this->ike_sa) == IKE_REKEYING)
1269 {
1270 DBG1(DBG_IKE, "unable to create CHILD_SA while rekeying IKE_SA");
1271 message->add_notify(message, TRUE, TEMPORARY_FAILURE, chunk_empty);
1272 return SUCCESS;
1273 }
1274 if (this->ike_sa->get_state(this->ike_sa) == IKE_DELETING)
1275 {
1276 DBG1(DBG_IKE, "unable to create CHILD_SA while deleting IKE_SA");
1277 message->add_notify(message, TRUE, TEMPORARY_FAILURE, chunk_empty);
1278 return SUCCESS;
1279 }
1280
1281 if (this->config == NULL)
1282 {
1283 this->config = select_child_cfg(this);
1284 }
1285 if (this->config == NULL)
1286 {
1287 DBG1(DBG_IKE, "traffic selectors %#R === %#R inacceptable",
1288 this->tsr, this->tsi);
1289 charon->bus->alert(charon->bus, ALERT_TS_MISMATCH, this->tsi, this->tsr);
1290 message->add_notify(message, FALSE, TS_UNACCEPTABLE, chunk_empty);
1291 handle_child_sa_failure(this, message);
1292 return SUCCESS;
1293 }
1294
1295 /* check if ike_config_t included non-critical error notifies */
1296 enumerator = message->create_payload_enumerator(message);
1297 while (enumerator->enumerate(enumerator, &payload))
1298 {
1299 if (payload->get_type(payload) == PLV2_NOTIFY)
1300 {
1301 notify_payload_t *notify = (notify_payload_t*)payload;
1302
1303 switch (notify->get_notify_type(notify))
1304 {
1305 case INTERNAL_ADDRESS_FAILURE:
1306 case FAILED_CP_REQUIRED:
1307 {
1308 DBG1(DBG_IKE,"configuration payload negotiation "
1309 "failed, no CHILD_SA built");
1310 enumerator->destroy(enumerator);
1311 handle_child_sa_failure(this, message);
1312 return SUCCESS;
1313 }
1314 default:
1315 break;
1316 }
1317 }
1318 }
1319 enumerator->destroy(enumerator);
1320
1321 this->child_sa = child_sa_create(this->ike_sa->get_my_host(this->ike_sa),
1322 this->ike_sa->get_other_host(this->ike_sa), this->config, this->reqid,
1323 this->ike_sa->has_condition(this->ike_sa, COND_NAT_ANY),
1324 this->mark_in, this->mark_out);
1325
1326 if (this->ipcomp_received != IPCOMP_NONE)
1327 {
1328 if (this->config->has_option(this->config, OPT_IPCOMP))
1329 {
1330 add_ipcomp_notify(this, message, this->ipcomp_received);
1331 }
1332 else
1333 {
1334 DBG1(DBG_IKE, "received %N notify but IPComp is disabled, ignoring",
1335 notify_type_names, IPCOMP_SUPPORTED);
1336 }
1337 }
1338
1339 switch (select_and_install(this, no_dh, ike_auth))
1340 {
1341 case SUCCESS:
1342 break;
1343 case NOT_FOUND:
1344 message->add_notify(message, FALSE, TS_UNACCEPTABLE, chunk_empty);
1345 handle_child_sa_failure(this, message);
1346 return SUCCESS;
1347 case INVALID_ARG:
1348 {
1349 uint16_t group = htons(this->dh_group);
1350 message->add_notify(message, FALSE, INVALID_KE_PAYLOAD,
1351 chunk_from_thing(group));
1352 handle_child_sa_failure(this, message);
1353 return SUCCESS;
1354 }
1355 case FAILED:
1356 default:
1357 message->add_notify(message, FALSE, NO_PROPOSAL_CHOSEN, chunk_empty);
1358 handle_child_sa_failure(this, message);
1359 return SUCCESS;
1360 }
1361
1362 if (!build_payloads(this, message))
1363 {
1364 message->add_notify(message, FALSE, NO_PROPOSAL_CHOSEN, chunk_empty);
1365 handle_child_sa_failure(this, message);
1366 return SUCCESS;
1367 }
1368
1369 if (!this->rekey)
1370 { /* invoke the child_up() hook if we are not rekeying */
1371 charon->bus->child_updown(charon->bus, this->child_sa, TRUE);
1372 }
1373 return SUCCESS;
1374 }
1375
1376 /**
1377 * Raise alerts for received notify errors
1378 */
1379 static void raise_alerts(private_child_create_t *this, notify_type_t type)
1380 {
1381 linked_list_t *list;
1382
1383 switch (type)
1384 {
1385 case NO_PROPOSAL_CHOSEN:
1386 list = this->config->get_proposals(this->config, FALSE);
1387 charon->bus->alert(charon->bus, ALERT_PROPOSAL_MISMATCH_CHILD, list);
1388 list->destroy_offset(list, offsetof(proposal_t, destroy));
1389 break;
1390 default:
1391 break;
1392 }
1393 }
1394
1395 METHOD(task_t, build_i_delete, status_t,
1396 private_child_create_t *this, message_t *message)
1397 {
1398 message->set_exchange_type(message, INFORMATIONAL);
1399 if (this->my_spi && this->proto)
1400 {
1401 delete_payload_t *del;
1402
1403 del = delete_payload_create(PLV2_DELETE, this->proto);
1404 del->add_spi(del, this->my_spi);
1405 message->add_payload(message, (payload_t*)del);
1406
1407 DBG1(DBG_IKE, "sending DELETE for %N CHILD_SA with SPI %.8x",
1408 protocol_id_names, this->proto, ntohl(this->my_spi));
1409 }
1410 return NEED_MORE;
1411 }
1412
1413 /**
1414 * Change task to delete the failed CHILD_SA as initiator
1415 */
1416 static status_t delete_failed_sa(private_child_create_t *this)
1417 {
1418 if (this->my_spi && this->proto)
1419 {
1420 this->public.task.build = _build_i_delete;
1421 this->public.task.process = (void*)return_success;
1422 return NEED_MORE;
1423 }
1424 return SUCCESS;
1425 }
1426
1427 METHOD(task_t, process_i, status_t,
1428 private_child_create_t *this, message_t *message)
1429 {
1430 enumerator_t *enumerator;
1431 payload_t *payload;
1432 bool no_dh = TRUE, ike_auth = FALSE;
1433
1434 switch (message->get_exchange_type(message))
1435 {
1436 case IKE_SA_INIT:
1437 return get_nonce(message, &this->other_nonce);
1438 case CREATE_CHILD_SA:
1439 get_nonce(message, &this->other_nonce);
1440 no_dh = FALSE;
1441 break;
1442 case IKE_AUTH:
1443 if (this->ike_sa->get_state(this->ike_sa) != IKE_ESTABLISHED)
1444 { /* wait until all authentication round completed */
1445 return NEED_MORE;
1446 }
1447 ike_auth = TRUE;
1448 default:
1449 break;
1450 }
1451
1452 /* check for erroneous notifies */
1453 enumerator = message->create_payload_enumerator(message);
1454 while (enumerator->enumerate(enumerator, &payload))
1455 {
1456 if (payload->get_type(payload) == PLV2_NOTIFY)
1457 {
1458 notify_payload_t *notify = (notify_payload_t*)payload;
1459 notify_type_t type = notify->get_notify_type(notify);
1460
1461 switch (type)
1462 {
1463 /* handle notify errors related to CHILD_SA only */
1464 case NO_PROPOSAL_CHOSEN:
1465 case SINGLE_PAIR_REQUIRED:
1466 case NO_ADDITIONAL_SAS:
1467 case INTERNAL_ADDRESS_FAILURE:
1468 case FAILED_CP_REQUIRED:
1469 case TS_UNACCEPTABLE:
1470 case INVALID_SELECTORS:
1471 {
1472 DBG1(DBG_IKE, "received %N notify, no CHILD_SA built",
1473 notify_type_names, type);
1474 enumerator->destroy(enumerator);
1475 raise_alerts(this, type);
1476 handle_child_sa_failure(this, message);
1477 /* an error in CHILD_SA creation is not critical */
1478 return SUCCESS;
1479 }
1480 case TEMPORARY_FAILURE:
1481 {
1482 DBG1(DBG_IKE, "received %N notify, will retry later",
1483 notify_type_names, type);
1484 enumerator->destroy(enumerator);
1485 if (!this->rekey)
1486 { /* the rekey task will retry itself if necessary */
1487 schedule_delayed_retry(this);
1488 }
1489 return SUCCESS;
1490 }
1491 case INVALID_KE_PAYLOAD:
1492 {
1493 chunk_t data;
1494 uint16_t group = MODP_NONE;
1495
1496 data = notify->get_notification_data(notify);
1497 if (data.len == sizeof(group))
1498 {
1499 memcpy(&group, data.ptr, data.len);
1500 group = ntohs(group);
1501 }
1502 DBG1(DBG_IKE, "peer didn't accept DH group %N, "
1503 "it requested %N", diffie_hellman_group_names,
1504 this->dh_group, diffie_hellman_group_names, group);
1505 this->retry = TRUE;
1506 this->dh_group = group;
1507 this->child_sa->set_state(this->child_sa, CHILD_RETRYING);
1508 this->public.task.migrate(&this->public.task, this->ike_sa);
1509 enumerator->destroy(enumerator);
1510 return NEED_MORE;
1511 }
1512 default:
1513 {
1514 if (message->get_exchange_type(message) == CREATE_CHILD_SA)
1515 { /* handle notifies if not handled in IKE_AUTH */
1516 if (type <= 16383)
1517 {
1518 DBG1(DBG_IKE, "received %N notify error",
1519 notify_type_names, type);
1520 enumerator->destroy(enumerator);
1521 return SUCCESS;
1522 }
1523 DBG2(DBG_IKE, "received %N notify",
1524 notify_type_names, type);
1525 }
1526 break;
1527 }
1528 }
1529 }
1530 }
1531 enumerator->destroy(enumerator);
1532
1533 process_payloads(this, message);
1534
1535 if (this->ipcomp == IPCOMP_NONE && this->ipcomp_received != IPCOMP_NONE)
1536 {
1537 DBG1(DBG_IKE, "received an IPCOMP_SUPPORTED notify without requesting"
1538 " one, no CHILD_SA built");
1539 handle_child_sa_failure(this, message);
1540 return delete_failed_sa(this);
1541 }
1542 else if (this->ipcomp != IPCOMP_NONE && this->ipcomp_received == IPCOMP_NONE)
1543 {
1544 DBG1(DBG_IKE, "peer didn't accept our proposed IPComp transforms, "
1545 "IPComp is disabled");
1546 this->ipcomp = IPCOMP_NONE;
1547 }
1548 else if (this->ipcomp != IPCOMP_NONE && this->ipcomp != this->ipcomp_received)
1549 {
1550 DBG1(DBG_IKE, "received an IPCOMP_SUPPORTED notify we didn't propose, "
1551 "no CHILD_SA built");
1552 handle_child_sa_failure(this, message);
1553 return delete_failed_sa(this);
1554 }
1555
1556 if (this->dh_failed)
1557 {
1558 DBG1(DBG_IKE, "applying DH public value failed");
1559 handle_child_sa_failure(this, message);
1560 return delete_failed_sa(this);
1561 }
1562
1563 if (select_and_install(this, no_dh, ike_auth) == SUCCESS)
1564 {
1565 if (!this->rekey)
1566 { /* invoke the child_up() hook if we are not rekeying */
1567 charon->bus->child_updown(charon->bus, this->child_sa, TRUE);
1568 }
1569 }
1570 else
1571 {
1572 handle_child_sa_failure(this, message);
1573 return delete_failed_sa(this);
1574 }
1575 return SUCCESS;
1576 }
1577
1578 METHOD(child_create_t, use_reqid, void,
1579 private_child_create_t *this, uint32_t reqid)
1580 {
1581 this->reqid = reqid;
1582 }
1583
1584 METHOD(child_create_t, use_marks, void,
1585 private_child_create_t *this, u_int in, u_int out)
1586 {
1587 this->mark_in = in;
1588 this->mark_out = out;
1589 }
1590
1591 METHOD(child_create_t, get_child, child_sa_t*,
1592 private_child_create_t *this)
1593 {
1594 return this->child_sa;
1595 }
1596
1597 METHOD(child_create_t, set_config, void,
1598 private_child_create_t *this, child_cfg_t *cfg)
1599 {
1600 DESTROY_IF(this->config);
1601 this->config = cfg;
1602 }
1603
1604 METHOD(child_create_t, get_lower_nonce, chunk_t,
1605 private_child_create_t *this)
1606 {
1607 if (memcmp(this->my_nonce.ptr, this->other_nonce.ptr,
1608 min(this->my_nonce.len, this->other_nonce.len)) < 0)
1609 {
1610 return this->my_nonce;
1611 }
1612 else
1613 {
1614 return this->other_nonce;
1615 }
1616 }
1617
1618 METHOD(task_t, get_type, task_type_t,
1619 private_child_create_t *this)
1620 {
1621 return TASK_CHILD_CREATE;
1622 }
1623
1624 METHOD(task_t, migrate, void,
1625 private_child_create_t *this, ike_sa_t *ike_sa)
1626 {
1627 chunk_free(&this->my_nonce);
1628 chunk_free(&this->other_nonce);
1629 if (this->tsr)
1630 {
1631 this->tsr->destroy_offset(this->tsr, offsetof(traffic_selector_t, destroy));
1632 }
1633 if (this->tsi)
1634 {
1635 this->tsi->destroy_offset(this->tsi, offsetof(traffic_selector_t, destroy));
1636 }
1637 DESTROY_IF(this->child_sa);
1638 DESTROY_IF(this->proposal);
1639 DESTROY_IF(this->nonceg);
1640 DESTROY_IF(this->dh);
1641 this->dh_failed = FALSE;
1642 if (this->proposals)
1643 {
1644 this->proposals->destroy_offset(this->proposals, offsetof(proposal_t, destroy));
1645 }
1646
1647 this->ike_sa = ike_sa;
1648 this->keymat = (keymat_v2_t*)ike_sa->get_keymat(ike_sa);
1649 this->proposal = NULL;
1650 this->proposals = NULL;
1651 this->tsi = NULL;
1652 this->tsr = NULL;
1653 this->dh = NULL;
1654 this->nonceg = NULL;
1655 this->child_sa = NULL;
1656 this->mode = MODE_TUNNEL;
1657 this->ipcomp = IPCOMP_NONE;
1658 this->ipcomp_received = IPCOMP_NONE;
1659 this->other_cpi = 0;
1660 this->reqid = 0;
1661 this->mark_in = 0;
1662 this->mark_out = 0;
1663 this->established = FALSE;
1664 }
1665
1666 METHOD(task_t, destroy, void,
1667 private_child_create_t *this)
1668 {
1669 chunk_free(&this->my_nonce);
1670 chunk_free(&this->other_nonce);
1671 if (this->tsr)
1672 {
1673 this->tsr->destroy_offset(this->tsr, offsetof(traffic_selector_t, destroy));
1674 }
1675 if (this->tsi)
1676 {
1677 this->tsi->destroy_offset(this->tsi, offsetof(traffic_selector_t, destroy));
1678 }
1679 if (!this->established)
1680 {
1681 DESTROY_IF(this->child_sa);
1682 }
1683 DESTROY_IF(this->packet_tsi);
1684 DESTROY_IF(this->packet_tsr);
1685 DESTROY_IF(this->proposal);
1686 DESTROY_IF(this->dh);
1687 if (this->proposals)
1688 {
1689 this->proposals->destroy_offset(this->proposals, offsetof(proposal_t, destroy));
1690 }
1691
1692 DESTROY_IF(this->config);
1693 DESTROY_IF(this->nonceg);
1694 free(this);
1695 }
1696
1697 /*
1698 * Described in header.
1699 */
1700 child_create_t *child_create_create(ike_sa_t *ike_sa,
1701 child_cfg_t *config, bool rekey,
1702 traffic_selector_t *tsi, traffic_selector_t *tsr)
1703 {
1704 private_child_create_t *this;
1705
1706 INIT(this,
1707 .public = {
1708 .get_child = _get_child,
1709 .set_config = _set_config,
1710 .get_lower_nonce = _get_lower_nonce,
1711 .use_reqid = _use_reqid,
1712 .use_marks = _use_marks,
1713 .task = {
1714 .get_type = _get_type,
1715 .migrate = _migrate,
1716 .destroy = _destroy,
1717 },
1718 },
1719 .ike_sa = ike_sa,
1720 .config = config,
1721 .packet_tsi = tsi ? tsi->clone(tsi) : NULL,
1722 .packet_tsr = tsr ? tsr->clone(tsr) : NULL,
1723 .dh_group = MODP_NONE,
1724 .keymat = (keymat_v2_t*)ike_sa->get_keymat(ike_sa),
1725 .mode = MODE_TUNNEL,
1726 .tfcv3 = TRUE,
1727 .ipcomp = IPCOMP_NONE,
1728 .ipcomp_received = IPCOMP_NONE,
1729 .rekey = rekey,
1730 .retry = FALSE,
1731 );
1732
1733 if (config)
1734 {
1735 this->public.task.build = _build_i;
1736 this->public.task.process = _process_i;
1737 this->initiator = TRUE;
1738 }
1739 else
1740 {
1741 this->public.task.build = _build_r;
1742 this->public.task.process = _process_r;
1743 this->initiator = FALSE;
1744 }
1745 return &this->public;
1746 }