71bd82cf1d52a5e6fb3d2173616156549b3c2106
[strongswan.git] / src / libcharon / sa / ikev2 / tasks / ike_init.c
1 /*
2 * Copyright (C) 2008-2015 Tobias Brunner
3 * Copyright (C) 2005-2008 Martin Willi
4 * Copyright (C) 2005 Jan Hutter
5 * 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 "ike_init.h"
19
20 #include <string.h>
21
22 #include <daemon.h>
23 #include <bio/bio_reader.h>
24 #include <bio/bio_writer.h>
25 #include <sa/ikev2/keymat_v2.h>
26 #include <crypto/diffie_hellman.h>
27 #include <crypto/hashers/hash_algorithm_set.h>
28 #include <encoding/payloads/sa_payload.h>
29 #include <encoding/payloads/ke_payload.h>
30 #include <encoding/payloads/nonce_payload.h>
31
32 /** maximum retries to do with cookies/other dh groups */
33 #define MAX_RETRIES 5
34
35 typedef struct private_ike_init_t private_ike_init_t;
36
37 /**
38 * Private members of a ike_init_t task.
39 */
40 struct private_ike_init_t {
41
42 /**
43 * Public methods and task_t interface.
44 */
45 ike_init_t public;
46
47 /**
48 * Assigned IKE_SA.
49 */
50 ike_sa_t *ike_sa;
51
52 /**
53 * Are we the initiator?
54 */
55 bool initiator;
56
57 /**
58 * IKE config to establish
59 */
60 ike_cfg_t *config;
61
62 /**
63 * diffie hellman group to use
64 */
65 diffie_hellman_group_t dh_group;
66
67 /**
68 * diffie hellman key exchange
69 */
70 diffie_hellman_t *dh;
71
72 /**
73 * Applying DH public value failed?
74 */
75 bool dh_failed;
76
77 /**
78 * Keymat derivation (from IKE_SA)
79 */
80 keymat_v2_t *keymat;
81
82 /**
83 * nonce chosen by us
84 */
85 chunk_t my_nonce;
86
87 /**
88 * nonce chosen by peer
89 */
90 chunk_t other_nonce;
91
92 /**
93 * nonce generator
94 */
95 nonce_gen_t *nonceg;
96
97 /**
98 * Negotiated proposal used for IKE_SA
99 */
100 proposal_t *proposal;
101
102 /**
103 * Old IKE_SA which gets rekeyed
104 */
105 ike_sa_t *old_sa;
106
107 /**
108 * cookie received from responder
109 */
110 chunk_t cookie;
111
112 /**
113 * retries done so far after failure (cookie or bad dh group)
114 */
115 u_int retry;
116
117 /**
118 * Whether to use Signature Authentication as per RFC 7427
119 */
120 bool signature_authentication;
121 };
122
123 /**
124 * Allocate our own nonce value
125 */
126 static bool generate_nonce(private_ike_init_t *this)
127 {
128 if (!this->nonceg)
129 {
130 DBG1(DBG_IKE, "no nonce generator found to create nonce");
131 return FALSE;
132 }
133 if (!this->nonceg->allocate_nonce(this->nonceg, NONCE_SIZE,
134 &this->my_nonce))
135 {
136 DBG1(DBG_IKE, "nonce allocation failed");
137 return FALSE;
138 }
139 return TRUE;
140 }
141
142 /**
143 * Notify the peer about the hash algorithms we support or expect,
144 * as per RFC 7427
145 */
146 static void send_supported_hash_algorithms(private_ike_init_t *this,
147 message_t *message)
148 {
149 hash_algorithm_set_t *algos;
150 enumerator_t *enumerator, *rounds;
151 bio_writer_t *writer;
152 hash_algorithm_t hash;
153 peer_cfg_t *peer;
154 auth_cfg_t *auth;
155 auth_rule_t rule;
156 uintptr_t config;
157 char *plugin_name;
158
159 algos = hash_algorithm_set_create();
160 peer = this->ike_sa->get_peer_cfg(this->ike_sa);
161 if (peer)
162 {
163 rounds = peer->create_auth_cfg_enumerator(peer, FALSE);
164 while (rounds->enumerate(rounds, &auth))
165 {
166 enumerator = auth->create_enumerator(auth);
167 while (enumerator->enumerate(enumerator, &rule, &config))
168 {
169 if (rule == AUTH_RULE_SIGNATURE_SCHEME)
170 {
171 hash = hasher_from_signature_scheme(config);
172 if (hasher_algorithm_for_ikev2(hash))
173 {
174 algos->add(algos, hash);
175 }
176 }
177 }
178 enumerator->destroy(enumerator);
179 }
180 rounds->destroy(rounds);
181 }
182
183 if (!algos->count(algos))
184 {
185 enumerator = lib->crypto->create_hasher_enumerator(lib->crypto);
186 while (enumerator->enumerate(enumerator, &hash, &plugin_name))
187 {
188 if (hasher_algorithm_for_ikev2(hash))
189 {
190 algos->add(algos, hash);
191 }
192 }
193 enumerator->destroy(enumerator);
194 }
195
196 if (algos->count(algos))
197 {
198 writer = bio_writer_create(0);
199 enumerator = algos->create_enumerator(algos);
200 while (enumerator->enumerate(enumerator, &hash))
201 {
202 writer->write_uint16(writer, hash);
203 }
204 enumerator->destroy(enumerator);
205 message->add_notify(message, FALSE, SIGNATURE_HASH_ALGORITHMS,
206 writer->get_buf(writer));
207 writer->destroy(writer);
208 }
209 algos->destroy(algos);
210 }
211
212 /**
213 * Store algorithms supported by other peer
214 */
215 static void handle_supported_hash_algorithms(private_ike_init_t *this,
216 notify_payload_t *notify)
217 {
218 bio_reader_t *reader;
219 u_int16_t algo;
220 bool added = FALSE;
221
222 reader = bio_reader_create(notify->get_notification_data(notify));
223 while (reader->remaining(reader) >= 2 && reader->read_uint16(reader, &algo))
224 {
225 if (hasher_algorithm_for_ikev2(algo))
226 {
227 this->keymat->add_hash_algorithm(this->keymat, algo);
228 added = TRUE;
229 }
230 }
231 reader->destroy(reader);
232
233 if (added)
234 {
235 this->ike_sa->enable_extension(this->ike_sa, EXT_SIGNATURE_AUTH);
236 }
237 }
238
239 /**
240 * build the payloads for the message
241 */
242 static bool build_payloads(private_ike_init_t *this, message_t *message)
243 {
244 sa_payload_t *sa_payload;
245 ke_payload_t *ke_payload;
246 nonce_payload_t *nonce_payload;
247 linked_list_t *proposal_list;
248 ike_sa_id_t *id;
249 proposal_t *proposal;
250 enumerator_t *enumerator;
251
252 id = this->ike_sa->get_id(this->ike_sa);
253
254 this->config = this->ike_sa->get_ike_cfg(this->ike_sa);
255
256 if (this->initiator)
257 {
258 proposal_list = this->config->get_proposals(this->config);
259 if (this->old_sa)
260 {
261 /* include SPI of new IKE_SA when we are rekeying */
262 enumerator = proposal_list->create_enumerator(proposal_list);
263 while (enumerator->enumerate(enumerator, (void**)&proposal))
264 {
265 proposal->set_spi(proposal, id->get_initiator_spi(id));
266 }
267 enumerator->destroy(enumerator);
268 }
269
270 sa_payload = sa_payload_create_from_proposals_v2(proposal_list);
271 proposal_list->destroy_offset(proposal_list, offsetof(proposal_t, destroy));
272 }
273 else
274 {
275 if (this->old_sa)
276 {
277 /* include SPI of new IKE_SA when we are rekeying */
278 this->proposal->set_spi(this->proposal, id->get_responder_spi(id));
279 }
280 sa_payload = sa_payload_create_from_proposal_v2(this->proposal);
281 }
282 message->add_payload(message, (payload_t*)sa_payload);
283
284 nonce_payload = nonce_payload_create(PLV2_NONCE);
285 nonce_payload->set_nonce(nonce_payload, this->my_nonce);
286 ke_payload = ke_payload_create_from_diffie_hellman(PLV2_KEY_EXCHANGE,
287 this->dh);
288 if (!ke_payload)
289 {
290 DBG1(DBG_IKE, "creating KE payload failed");
291 return FALSE;
292 }
293
294 if (this->old_sa)
295 { /* payload order differs if we are rekeying */
296 message->add_payload(message, (payload_t*)nonce_payload);
297 message->add_payload(message, (payload_t*)ke_payload);
298 }
299 else
300 {
301 message->add_payload(message, (payload_t*)ke_payload);
302 message->add_payload(message, (payload_t*)nonce_payload);
303 }
304
305 /* negotiate fragmentation if we are not rekeying */
306 if (!this->old_sa &&
307 this->config->fragmentation(this->config) != FRAGMENTATION_NO)
308 {
309 if (this->initiator ||
310 this->ike_sa->supports_extension(this->ike_sa,
311 EXT_IKE_FRAGMENTATION))
312 {
313 message->add_notify(message, FALSE, FRAGMENTATION_SUPPORTED,
314 chunk_empty);
315 }
316 }
317 /* submit supported hash algorithms for signature authentication */
318 if (!this->old_sa && this->signature_authentication)
319 {
320 if (this->initiator ||
321 this->ike_sa->supports_extension(this->ike_sa,
322 EXT_SIGNATURE_AUTH))
323 {
324 send_supported_hash_algorithms(this, message);
325 }
326 }
327 /* notify other peer if we support redirection */
328 if (!this->old_sa && this->initiator)
329 {
330 message->add_notify(message, FALSE, REDIRECT_SUPPORTED, chunk_empty);
331 }
332 return TRUE;
333 }
334
335 /**
336 * Read payloads from message
337 */
338 static void process_payloads(private_ike_init_t *this, message_t *message)
339 {
340 enumerator_t *enumerator;
341 payload_t *payload;
342 ke_payload_t *ke_payload = NULL;
343
344 enumerator = message->create_payload_enumerator(message);
345 while (enumerator->enumerate(enumerator, &payload))
346 {
347 switch (payload->get_type(payload))
348 {
349 case PLV2_SECURITY_ASSOCIATION:
350 {
351 sa_payload_t *sa_payload = (sa_payload_t*)payload;
352 linked_list_t *proposal_list;
353 bool private;
354
355 proposal_list = sa_payload->get_proposals(sa_payload);
356 private = this->ike_sa->supports_extension(this->ike_sa,
357 EXT_STRONGSWAN);
358 this->proposal = this->config->select_proposal(this->config,
359 proposal_list, private);
360 if (!this->proposal)
361 {
362 charon->bus->alert(charon->bus, ALERT_PROPOSAL_MISMATCH_IKE,
363 proposal_list);
364 }
365 proposal_list->destroy_offset(proposal_list,
366 offsetof(proposal_t, destroy));
367 break;
368 }
369 case PLV2_KEY_EXCHANGE:
370 {
371 ke_payload = (ke_payload_t*)payload;
372
373 this->dh_group = ke_payload->get_dh_group_number(ke_payload);
374 break;
375 }
376 case PLV2_NONCE:
377 {
378 nonce_payload_t *nonce_payload = (nonce_payload_t*)payload;
379
380 this->other_nonce = nonce_payload->get_nonce(nonce_payload);
381 break;
382 }
383 case PLV2_NOTIFY:
384 {
385 notify_payload_t *notify = (notify_payload_t*)payload;
386
387 switch (notify->get_notify_type(notify))
388 {
389 case FRAGMENTATION_SUPPORTED:
390 this->ike_sa->enable_extension(this->ike_sa,
391 EXT_IKE_FRAGMENTATION);
392 break;
393 case SIGNATURE_HASH_ALGORITHMS:
394 if (this->signature_authentication)
395 {
396 handle_supported_hash_algorithms(this, notify);
397 }
398 break;
399 case REDIRECT_SUPPORTED:
400 this->ike_sa->enable_extension(this->ike_sa,
401 EXT_IKE_REDIRECTION);
402 break;
403 default:
404 /* other notifies are handled elsewhere */
405 break;
406 }
407
408 }
409 default:
410 break;
411 }
412 }
413 enumerator->destroy(enumerator);
414
415 if (ke_payload && this->proposal &&
416 this->proposal->has_dh_group(this->proposal, this->dh_group))
417 {
418 if (!this->initiator)
419 {
420 this->dh = this->keymat->keymat.create_dh(
421 &this->keymat->keymat, this->dh_group);
422 }
423 if (this->dh)
424 {
425 this->dh_failed = !this->dh->set_other_public_value(this->dh,
426 ke_payload->get_key_exchange_data(ke_payload));
427 }
428 }
429 }
430
431 METHOD(task_t, build_i, status_t,
432 private_ike_init_t *this, message_t *message)
433 {
434 this->config = this->ike_sa->get_ike_cfg(this->ike_sa);
435 DBG0(DBG_IKE, "initiating IKE_SA %s[%d] to %H",
436 this->ike_sa->get_name(this->ike_sa),
437 this->ike_sa->get_unique_id(this->ike_sa),
438 this->ike_sa->get_other_host(this->ike_sa));
439 this->ike_sa->set_state(this->ike_sa, IKE_CONNECTING);
440
441 if (this->retry >= MAX_RETRIES)
442 {
443 DBG1(DBG_IKE, "giving up after %d retries", MAX_RETRIES);
444 return FAILED;
445 }
446
447 /* if the DH group is set via use_dh_group(), we already have a DH object */
448 if (!this->dh)
449 {
450 this->dh_group = this->config->get_dh_group(this->config);
451 this->dh = this->keymat->keymat.create_dh(&this->keymat->keymat,
452 this->dh_group);
453 if (!this->dh)
454 {
455 DBG1(DBG_IKE, "configured DH group %N not supported",
456 diffie_hellman_group_names, this->dh_group);
457 return FAILED;
458 }
459 }
460
461 /* generate nonce only when we are trying the first time */
462 if (this->my_nonce.ptr == NULL)
463 {
464 if (!generate_nonce(this))
465 {
466 return FAILED;
467 }
468 }
469
470 if (this->cookie.ptr)
471 {
472 message->add_notify(message, FALSE, COOKIE, this->cookie);
473 }
474
475 if (!build_payloads(this, message))
476 {
477 return FAILED;
478 }
479
480 #ifdef ME
481 {
482 chunk_t connect_id = this->ike_sa->get_connect_id(this->ike_sa);
483 if (connect_id.ptr)
484 {
485 message->add_notify(message, FALSE, ME_CONNECTID, connect_id);
486 }
487 }
488 #endif /* ME */
489
490 return NEED_MORE;
491 }
492
493 METHOD(task_t, process_r, status_t,
494 private_ike_init_t *this, message_t *message)
495 {
496 this->config = this->ike_sa->get_ike_cfg(this->ike_sa);
497 DBG0(DBG_IKE, "%H is initiating an IKE_SA", message->get_source(message));
498 this->ike_sa->set_state(this->ike_sa, IKE_CONNECTING);
499
500 if (!generate_nonce(this))
501 {
502 return FAILED;
503 }
504
505 #ifdef ME
506 {
507 notify_payload_t *notify = message->get_notify(message, ME_CONNECTID);
508 if (notify)
509 {
510 chunk_t connect_id = notify->get_notification_data(notify);
511 DBG2(DBG_IKE, "received ME_CONNECTID %#B", &connect_id);
512 charon->connect_manager->stop_checks(charon->connect_manager,
513 connect_id);
514 }
515 }
516 #endif /* ME */
517
518 process_payloads(this, message);
519
520 return NEED_MORE;
521 }
522
523 /**
524 * Derive the keymat for the IKE_SA
525 */
526 static bool derive_keys(private_ike_init_t *this,
527 chunk_t nonce_i, chunk_t nonce_r)
528 {
529 keymat_v2_t *old_keymat;
530 pseudo_random_function_t prf_alg = PRF_UNDEFINED;
531 chunk_t skd = chunk_empty;
532 ike_sa_id_t *id;
533
534 id = this->ike_sa->get_id(this->ike_sa);
535 if (this->old_sa)
536 {
537 /* rekeying: Include old SKd, use old PRF, apply SPI */
538 old_keymat = (keymat_v2_t*)this->old_sa->get_keymat(this->old_sa);
539 prf_alg = old_keymat->get_skd(old_keymat, &skd);
540 if (this->initiator)
541 {
542 id->set_responder_spi(id, this->proposal->get_spi(this->proposal));
543 }
544 else
545 {
546 id->set_initiator_spi(id, this->proposal->get_spi(this->proposal));
547 }
548 }
549 if (!this->keymat->derive_ike_keys(this->keymat, this->proposal, this->dh,
550 nonce_i, nonce_r, id, prf_alg, skd))
551 {
552 return FALSE;
553 }
554 charon->bus->ike_keys(charon->bus, this->ike_sa, this->dh, chunk_empty,
555 nonce_i, nonce_r, this->old_sa, NULL);
556 return TRUE;
557 }
558
559 METHOD(task_t, build_r, status_t,
560 private_ike_init_t *this, message_t *message)
561 {
562 identification_t *gateway;
563
564 /* check if we have everything we need */
565 if (this->proposal == NULL ||
566 this->other_nonce.len == 0 || this->my_nonce.len == 0)
567 {
568 DBG1(DBG_IKE, "received proposals inacceptable");
569 message->add_notify(message, TRUE, NO_PROPOSAL_CHOSEN, chunk_empty);
570 return FAILED;
571 }
572 this->ike_sa->set_proposal(this->ike_sa, this->proposal);
573
574 /* check if we'd have to redirect the client */
575 if (this->ike_sa->supports_extension(this->ike_sa, EXT_IKE_REDIRECTION) &&
576 charon->redirect->redirect_on_init(charon->redirect, this->ike_sa,
577 &gateway))
578 {
579 chunk_t data;
580
581 DBG1(DBG_IKE, "redirecting peer to %Y", gateway);
582 data = redirect_data_create(gateway, this->other_nonce);
583 message->add_notify(message, TRUE, REDIRECT, data);
584 gateway->destroy(gateway);
585 chunk_free(&data);
586 return FAILED;
587 }
588
589 if (this->dh == NULL ||
590 !this->proposal->has_dh_group(this->proposal, this->dh_group))
591 {
592 u_int16_t group;
593
594 if (this->proposal->get_algorithm(this->proposal, DIFFIE_HELLMAN_GROUP,
595 &group, NULL))
596 {
597 DBG1(DBG_IKE, "DH group %N inacceptable, requesting %N",
598 diffie_hellman_group_names, this->dh_group,
599 diffie_hellman_group_names, group);
600 this->dh_group = group;
601 group = htons(group);
602 message->add_notify(message, FALSE, INVALID_KE_PAYLOAD,
603 chunk_from_thing(group));
604 }
605 else
606 {
607 DBG1(DBG_IKE, "no acceptable proposal found");
608 }
609 return FAILED;
610 }
611
612 if (this->dh_failed)
613 {
614 DBG1(DBG_IKE, "applying DH public value failed");
615 message->add_notify(message, TRUE, NO_PROPOSAL_CHOSEN, chunk_empty);
616 return FAILED;
617 }
618
619 if (!derive_keys(this, this->other_nonce, this->my_nonce))
620 {
621 DBG1(DBG_IKE, "key derivation failed");
622 message->add_notify(message, TRUE, NO_PROPOSAL_CHOSEN, chunk_empty);
623 return FAILED;
624 }
625 if (!build_payloads(this, message))
626 {
627 message->add_notify(message, TRUE, NO_PROPOSAL_CHOSEN, chunk_empty);
628 return FAILED;
629 }
630 return SUCCESS;
631 }
632
633 /**
634 * Raise alerts for received notify errors
635 */
636 static void raise_alerts(private_ike_init_t *this, notify_type_t type)
637 {
638 linked_list_t *list;
639
640 switch (type)
641 {
642 case NO_PROPOSAL_CHOSEN:
643 list = this->config->get_proposals(this->config);
644 charon->bus->alert(charon->bus, ALERT_PROPOSAL_MISMATCH_IKE, list);
645 list->destroy_offset(list, offsetof(proposal_t, destroy));
646 break;
647 default:
648 break;
649 }
650 }
651
652 METHOD(task_t, process_i, status_t,
653 private_ike_init_t *this, message_t *message)
654 {
655 enumerator_t *enumerator;
656 payload_t *payload;
657
658 /* check for erroneous notifies */
659 enumerator = message->create_payload_enumerator(message);
660 while (enumerator->enumerate(enumerator, &payload))
661 {
662 if (payload->get_type(payload) == PLV2_NOTIFY)
663 {
664 notify_payload_t *notify = (notify_payload_t*)payload;
665 notify_type_t type = notify->get_notify_type(notify);
666
667 switch (type)
668 {
669 case INVALID_KE_PAYLOAD:
670 {
671 chunk_t data;
672 diffie_hellman_group_t bad_group;
673
674 bad_group = this->dh_group;
675 data = notify->get_notification_data(notify);
676 this->dh_group = ntohs(*((u_int16_t*)data.ptr));
677 DBG1(DBG_IKE, "peer didn't accept DH group %N, "
678 "it requested %N", diffie_hellman_group_names,
679 bad_group, diffie_hellman_group_names, this->dh_group);
680
681 if (this->old_sa == NULL)
682 { /* reset the IKE_SA if we are not rekeying */
683 this->ike_sa->reset(this->ike_sa);
684 }
685
686 enumerator->destroy(enumerator);
687 this->retry++;
688 return NEED_MORE;
689 }
690 case NAT_DETECTION_SOURCE_IP:
691 case NAT_DETECTION_DESTINATION_IP:
692 /* skip, handled in ike_natd_t */
693 break;
694 case MULTIPLE_AUTH_SUPPORTED:
695 /* handled in ike_auth_t */
696 break;
697 case COOKIE:
698 {
699 chunk_free(&this->cookie);
700 this->cookie = chunk_clone(notify->get_notification_data(notify));
701 this->ike_sa->reset(this->ike_sa);
702 enumerator->destroy(enumerator);
703 DBG2(DBG_IKE, "received %N notify", notify_type_names, type);
704 this->retry++;
705 return NEED_MORE;
706 }
707 case REDIRECT:
708 {
709 identification_t *gateway;
710 chunk_t data, nonce = chunk_empty;
711 status_t status = FAILED;
712
713 data = notify->get_notification_data(notify);
714 gateway = redirect_data_parse(data, &nonce);
715 enumerator->destroy(enumerator);
716 if (!gateway || !chunk_equals(nonce, this->my_nonce))
717 {
718 DBG1(DBG_IKE, "received invalid REDIRECT notify");
719 }
720 else if (this->ike_sa->handle_redirect(this->ike_sa,
721 gateway))
722 {
723 status = NEED_MORE;
724 }
725 DESTROY_IF(gateway);
726 chunk_free(&nonce);
727 return status;
728 }
729 default:
730 {
731 if (type <= 16383)
732 {
733 DBG1(DBG_IKE, "received %N notify error",
734 notify_type_names, type);
735 enumerator->destroy(enumerator);
736 raise_alerts(this, type);
737 return FAILED;
738 }
739 DBG2(DBG_IKE, "received %N notify",
740 notify_type_names, type);
741 break;
742 }
743 }
744 }
745 }
746 enumerator->destroy(enumerator);
747
748 process_payloads(this, message);
749
750 /* check if we have everything */
751 if (this->proposal == NULL ||
752 this->other_nonce.len == 0 || this->my_nonce.len == 0)
753 {
754 DBG1(DBG_IKE, "peers proposal selection invalid");
755 return FAILED;
756 }
757 this->ike_sa->set_proposal(this->ike_sa, this->proposal);
758
759 if (this->dh == NULL ||
760 !this->proposal->has_dh_group(this->proposal, this->dh_group))
761 {
762 DBG1(DBG_IKE, "peer DH group selection invalid");
763 return FAILED;
764 }
765
766 if (this->dh_failed)
767 {
768 DBG1(DBG_IKE, "applying DH public value failed");
769 return FAILED;
770 }
771
772 if (!derive_keys(this, this->my_nonce, this->other_nonce))
773 {
774 DBG1(DBG_IKE, "key derivation failed");
775 return FAILED;
776 }
777 return SUCCESS;
778 }
779
780 METHOD(task_t, get_type, task_type_t,
781 private_ike_init_t *this)
782 {
783 return TASK_IKE_INIT;
784 }
785
786 METHOD(task_t, migrate, void,
787 private_ike_init_t *this, ike_sa_t *ike_sa)
788 {
789 DESTROY_IF(this->proposal);
790 chunk_free(&this->other_nonce);
791
792 this->ike_sa = ike_sa;
793 this->keymat = (keymat_v2_t*)ike_sa->get_keymat(ike_sa);
794 this->proposal = NULL;
795 this->dh_failed = FALSE;
796 if (this->dh && this->dh->get_dh_group(this->dh) != this->dh_group)
797 { /* reset DH value only if group changed (INVALID_KE_PAYLOAD) */
798 this->dh->destroy(this->dh);
799 this->dh = this->keymat->keymat.create_dh(&this->keymat->keymat,
800 this->dh_group);
801 }
802 }
803
804 METHOD(task_t, destroy, void,
805 private_ike_init_t *this)
806 {
807 DESTROY_IF(this->dh);
808 DESTROY_IF(this->proposal);
809 DESTROY_IF(this->nonceg);
810 chunk_free(&this->my_nonce);
811 chunk_free(&this->other_nonce);
812 chunk_free(&this->cookie);
813 free(this);
814 }
815
816 METHOD(ike_init_t, get_lower_nonce, chunk_t,
817 private_ike_init_t *this)
818 {
819 if (memcmp(this->my_nonce.ptr, this->other_nonce.ptr,
820 min(this->my_nonce.len, this->other_nonce.len)) < 0)
821 {
822 return this->my_nonce;
823 }
824 else
825 {
826 return this->other_nonce;
827 }
828 }
829
830 /*
831 * Described in header.
832 */
833 ike_init_t *ike_init_create(ike_sa_t *ike_sa, bool initiator, ike_sa_t *old_sa)
834 {
835 private_ike_init_t *this;
836
837 INIT(this,
838 .public = {
839 .task = {
840 .get_type = _get_type,
841 .migrate = _migrate,
842 .destroy = _destroy,
843 },
844 .get_lower_nonce = _get_lower_nonce,
845 },
846 .ike_sa = ike_sa,
847 .initiator = initiator,
848 .dh_group = MODP_NONE,
849 .keymat = (keymat_v2_t*)ike_sa->get_keymat(ike_sa),
850 .old_sa = old_sa,
851 .signature_authentication = lib->settings->get_bool(lib->settings,
852 "%s.signature_authentication", TRUE, lib->ns),
853 );
854 this->nonceg = this->keymat->keymat.create_nonce_gen(&this->keymat->keymat);
855
856 if (initiator)
857 {
858 this->public.task.build = _build_i;
859 this->public.task.process = _process_i;
860 }
861 else
862 {
863 this->public.task.build = _build_r;
864 this->public.task.process = _process_r;
865 }
866 return &this->public;
867 }