Merge branch 'exchange-collisions'
[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 * Whether to follow IKEv2 redirects as per RFC 5685
124 */
125 bool follow_redirects;
126 };
127
128 /**
129 * Allocate our own nonce value
130 */
131 static bool generate_nonce(private_ike_init_t *this)
132 {
133 if (!this->nonceg)
134 {
135 DBG1(DBG_IKE, "no nonce generator found to create nonce");
136 return FALSE;
137 }
138 if (!this->nonceg->allocate_nonce(this->nonceg, NONCE_SIZE,
139 &this->my_nonce))
140 {
141 DBG1(DBG_IKE, "nonce allocation failed");
142 return FALSE;
143 }
144 return TRUE;
145 }
146
147 /**
148 * Notify the peer about the hash algorithms we support or expect,
149 * as per RFC 7427
150 */
151 static void send_supported_hash_algorithms(private_ike_init_t *this,
152 message_t *message)
153 {
154 hash_algorithm_set_t *algos;
155 enumerator_t *enumerator, *rounds;
156 bio_writer_t *writer;
157 hash_algorithm_t hash;
158 peer_cfg_t *peer;
159 auth_cfg_t *auth;
160 auth_rule_t rule;
161 uintptr_t config;
162 char *plugin_name;
163
164 algos = hash_algorithm_set_create();
165 peer = this->ike_sa->get_peer_cfg(this->ike_sa);
166 if (peer)
167 {
168 rounds = peer->create_auth_cfg_enumerator(peer, FALSE);
169 while (rounds->enumerate(rounds, &auth))
170 {
171 enumerator = auth->create_enumerator(auth);
172 while (enumerator->enumerate(enumerator, &rule, &config))
173 {
174 if (rule == AUTH_RULE_IKE_SIGNATURE_SCHEME)
175 {
176 hash = hasher_from_signature_scheme(config);
177 if (hasher_algorithm_for_ikev2(hash))
178 {
179 algos->add(algos, hash);
180 }
181 }
182 }
183 enumerator->destroy(enumerator);
184 }
185 rounds->destroy(rounds);
186 }
187
188 if (!algos->count(algos))
189 {
190 enumerator = lib->crypto->create_hasher_enumerator(lib->crypto);
191 while (enumerator->enumerate(enumerator, &hash, &plugin_name))
192 {
193 if (hasher_algorithm_for_ikev2(hash))
194 {
195 algos->add(algos, hash);
196 }
197 }
198 enumerator->destroy(enumerator);
199 }
200
201 if (algos->count(algos))
202 {
203 writer = bio_writer_create(0);
204 enumerator = algos->create_enumerator(algos);
205 while (enumerator->enumerate(enumerator, &hash))
206 {
207 writer->write_uint16(writer, hash);
208 }
209 enumerator->destroy(enumerator);
210 message->add_notify(message, FALSE, SIGNATURE_HASH_ALGORITHMS,
211 writer->get_buf(writer));
212 writer->destroy(writer);
213 }
214 algos->destroy(algos);
215 }
216
217 /**
218 * Store algorithms supported by other peer
219 */
220 static void handle_supported_hash_algorithms(private_ike_init_t *this,
221 notify_payload_t *notify)
222 {
223 bio_reader_t *reader;
224 uint16_t algo;
225 bool added = FALSE;
226
227 reader = bio_reader_create(notify->get_notification_data(notify));
228 while (reader->remaining(reader) >= 2 && reader->read_uint16(reader, &algo))
229 {
230 if (hasher_algorithm_for_ikev2(algo))
231 {
232 this->keymat->add_hash_algorithm(this->keymat, algo);
233 added = TRUE;
234 }
235 }
236 reader->destroy(reader);
237
238 if (added)
239 {
240 this->ike_sa->enable_extension(this->ike_sa, EXT_SIGNATURE_AUTH);
241 }
242 }
243
244 /**
245 * build the payloads for the message
246 */
247 static bool build_payloads(private_ike_init_t *this, message_t *message)
248 {
249 sa_payload_t *sa_payload;
250 ke_payload_t *ke_payload;
251 nonce_payload_t *nonce_payload;
252 linked_list_t *proposal_list;
253 ike_sa_id_t *id;
254 proposal_t *proposal;
255 enumerator_t *enumerator;
256
257 id = this->ike_sa->get_id(this->ike_sa);
258
259 this->config = this->ike_sa->get_ike_cfg(this->ike_sa);
260
261 if (this->initiator)
262 {
263 proposal_list = this->config->get_proposals(this->config);
264 if (this->old_sa)
265 {
266 /* include SPI of new IKE_SA when we are rekeying */
267 enumerator = proposal_list->create_enumerator(proposal_list);
268 while (enumerator->enumerate(enumerator, (void**)&proposal))
269 {
270 proposal->set_spi(proposal, id->get_initiator_spi(id));
271 }
272 enumerator->destroy(enumerator);
273 }
274
275 sa_payload = sa_payload_create_from_proposals_v2(proposal_list);
276 proposal_list->destroy_offset(proposal_list, offsetof(proposal_t, destroy));
277 }
278 else
279 {
280 if (this->old_sa)
281 {
282 /* include SPI of new IKE_SA when we are rekeying */
283 this->proposal->set_spi(this->proposal, id->get_responder_spi(id));
284 }
285 sa_payload = sa_payload_create_from_proposal_v2(this->proposal);
286 }
287 message->add_payload(message, (payload_t*)sa_payload);
288
289 nonce_payload = nonce_payload_create(PLV2_NONCE);
290 nonce_payload->set_nonce(nonce_payload, this->my_nonce);
291 ke_payload = ke_payload_create_from_diffie_hellman(PLV2_KEY_EXCHANGE,
292 this->dh);
293 if (!ke_payload)
294 {
295 DBG1(DBG_IKE, "creating KE payload failed");
296 return FALSE;
297 }
298
299 if (this->old_sa)
300 { /* payload order differs if we are rekeying */
301 message->add_payload(message, (payload_t*)nonce_payload);
302 message->add_payload(message, (payload_t*)ke_payload);
303 }
304 else
305 {
306 message->add_payload(message, (payload_t*)ke_payload);
307 message->add_payload(message, (payload_t*)nonce_payload);
308 }
309
310 /* negotiate fragmentation if we are not rekeying */
311 if (!this->old_sa &&
312 this->config->fragmentation(this->config) != FRAGMENTATION_NO)
313 {
314 if (this->initiator ||
315 this->ike_sa->supports_extension(this->ike_sa,
316 EXT_IKE_FRAGMENTATION))
317 {
318 message->add_notify(message, FALSE, FRAGMENTATION_SUPPORTED,
319 chunk_empty);
320 }
321 }
322 /* submit supported hash algorithms for signature authentication */
323 if (!this->old_sa && this->signature_authentication)
324 {
325 if (this->initiator ||
326 this->ike_sa->supports_extension(this->ike_sa,
327 EXT_SIGNATURE_AUTH))
328 {
329 send_supported_hash_algorithms(this, message);
330 }
331 }
332 /* notify other peer if we support redirection */
333 if (!this->old_sa && this->initiator && this->follow_redirects)
334 {
335 identification_t *gateway;
336 host_t *from;
337 chunk_t data;
338
339 from = this->ike_sa->get_redirected_from(this->ike_sa);
340 if (from)
341 {
342 gateway = identification_create_from_sockaddr(
343 from->get_sockaddr(from));
344 data = redirect_data_create(gateway, chunk_empty);
345 message->add_notify(message, FALSE, REDIRECTED_FROM, data);
346 chunk_free(&data);
347 gateway->destroy(gateway);
348 }
349 else
350 {
351 message->add_notify(message, FALSE, REDIRECT_SUPPORTED,
352 chunk_empty);
353 }
354 }
355 return TRUE;
356 }
357
358 /**
359 * Read payloads from message
360 */
361 static void process_payloads(private_ike_init_t *this, message_t *message)
362 {
363 enumerator_t *enumerator;
364 payload_t *payload;
365 ke_payload_t *ke_payload = NULL;
366
367 enumerator = message->create_payload_enumerator(message);
368 while (enumerator->enumerate(enumerator, &payload))
369 {
370 switch (payload->get_type(payload))
371 {
372 case PLV2_SECURITY_ASSOCIATION:
373 {
374 sa_payload_t *sa_payload = (sa_payload_t*)payload;
375 linked_list_t *proposal_list;
376 bool private, prefer_configured;
377
378 proposal_list = sa_payload->get_proposals(sa_payload);
379 private = this->ike_sa->supports_extension(this->ike_sa,
380 EXT_STRONGSWAN);
381 prefer_configured = lib->settings->get_bool(lib->settings,
382 "%s.prefer_configured_proposals", TRUE, lib->ns);
383 this->proposal = this->config->select_proposal(this->config,
384 proposal_list, private, prefer_configured);
385 if (!this->proposal)
386 {
387 charon->bus->alert(charon->bus, ALERT_PROPOSAL_MISMATCH_IKE,
388 proposal_list);
389 }
390 proposal_list->destroy_offset(proposal_list,
391 offsetof(proposal_t, destroy));
392 break;
393 }
394 case PLV2_KEY_EXCHANGE:
395 {
396 ke_payload = (ke_payload_t*)payload;
397
398 this->dh_group = ke_payload->get_dh_group_number(ke_payload);
399 break;
400 }
401 case PLV2_NONCE:
402 {
403 nonce_payload_t *nonce_payload = (nonce_payload_t*)payload;
404
405 this->other_nonce = nonce_payload->get_nonce(nonce_payload);
406 break;
407 }
408 case PLV2_NOTIFY:
409 {
410 notify_payload_t *notify = (notify_payload_t*)payload;
411
412 switch (notify->get_notify_type(notify))
413 {
414 case FRAGMENTATION_SUPPORTED:
415 this->ike_sa->enable_extension(this->ike_sa,
416 EXT_IKE_FRAGMENTATION);
417 break;
418 case SIGNATURE_HASH_ALGORITHMS:
419 if (this->signature_authentication)
420 {
421 handle_supported_hash_algorithms(this, notify);
422 }
423 break;
424 case REDIRECTED_FROM:
425 {
426 identification_t *gateway;
427 chunk_t data;
428
429 data = notify->get_notification_data(notify);
430 gateway = redirect_data_parse(data, NULL);
431 if (!gateway)
432 {
433 DBG1(DBG_IKE, "received invalid REDIRECTED_FROM "
434 "notify, ignored");
435 break;
436 }
437 DBG1(DBG_IKE, "client got redirected from %Y", gateway);
438 gateway->destroy(gateway);
439 /* fall-through */
440 }
441 case REDIRECT_SUPPORTED:
442 if (!this->old_sa)
443 {
444 this->ike_sa->enable_extension(this->ike_sa,
445 EXT_IKE_REDIRECTION);
446 }
447 break;
448 default:
449 /* other notifies are handled elsewhere */
450 break;
451 }
452
453 }
454 default:
455 break;
456 }
457 }
458 enumerator->destroy(enumerator);
459
460 if (ke_payload && this->proposal &&
461 this->proposal->has_dh_group(this->proposal, this->dh_group))
462 {
463 if (!this->initiator)
464 {
465 this->dh = this->keymat->keymat.create_dh(
466 &this->keymat->keymat, this->dh_group);
467 }
468 if (this->dh)
469 {
470 this->dh_failed = !this->dh->set_other_public_value(this->dh,
471 ke_payload->get_key_exchange_data(ke_payload));
472 }
473 }
474 }
475
476 METHOD(task_t, build_i, status_t,
477 private_ike_init_t *this, message_t *message)
478 {
479 this->config = this->ike_sa->get_ike_cfg(this->ike_sa);
480 DBG0(DBG_IKE, "initiating IKE_SA %s[%d] to %H",
481 this->ike_sa->get_name(this->ike_sa),
482 this->ike_sa->get_unique_id(this->ike_sa),
483 this->ike_sa->get_other_host(this->ike_sa));
484 this->ike_sa->set_state(this->ike_sa, IKE_CONNECTING);
485
486 if (this->retry >= MAX_RETRIES)
487 {
488 DBG1(DBG_IKE, "giving up after %d retries", MAX_RETRIES);
489 return FAILED;
490 }
491
492 /* if the DH group is set via use_dh_group(), we already have a DH object */
493 if (!this->dh)
494 {
495 this->dh_group = this->config->get_dh_group(this->config);
496 this->dh = this->keymat->keymat.create_dh(&this->keymat->keymat,
497 this->dh_group);
498 if (!this->dh)
499 {
500 DBG1(DBG_IKE, "configured DH group %N not supported",
501 diffie_hellman_group_names, this->dh_group);
502 return FAILED;
503 }
504 }
505
506 /* generate nonce only when we are trying the first time */
507 if (this->my_nonce.ptr == NULL)
508 {
509 if (!generate_nonce(this))
510 {
511 return FAILED;
512 }
513 }
514
515 if (this->cookie.ptr)
516 {
517 message->add_notify(message, FALSE, COOKIE, this->cookie);
518 }
519
520 if (!build_payloads(this, message))
521 {
522 return FAILED;
523 }
524
525 #ifdef ME
526 {
527 chunk_t connect_id = this->ike_sa->get_connect_id(this->ike_sa);
528 if (connect_id.ptr)
529 {
530 message->add_notify(message, FALSE, ME_CONNECTID, connect_id);
531 }
532 }
533 #endif /* ME */
534
535 return NEED_MORE;
536 }
537
538 METHOD(task_t, process_r, status_t,
539 private_ike_init_t *this, message_t *message)
540 {
541 this->config = this->ike_sa->get_ike_cfg(this->ike_sa);
542 DBG0(DBG_IKE, "%H is initiating an IKE_SA", message->get_source(message));
543 this->ike_sa->set_state(this->ike_sa, IKE_CONNECTING);
544
545 if (!generate_nonce(this))
546 {
547 return FAILED;
548 }
549
550 #ifdef ME
551 {
552 notify_payload_t *notify = message->get_notify(message, ME_CONNECTID);
553 if (notify)
554 {
555 chunk_t connect_id = notify->get_notification_data(notify);
556 DBG2(DBG_IKE, "received ME_CONNECTID %#B", &connect_id);
557 charon->connect_manager->stop_checks(charon->connect_manager,
558 connect_id);
559 }
560 }
561 #endif /* ME */
562
563 process_payloads(this, message);
564
565 return NEED_MORE;
566 }
567
568 /**
569 * Derive the keymat for the IKE_SA
570 */
571 static bool derive_keys(private_ike_init_t *this,
572 chunk_t nonce_i, chunk_t nonce_r)
573 {
574 keymat_v2_t *old_keymat;
575 pseudo_random_function_t prf_alg = PRF_UNDEFINED;
576 chunk_t skd = chunk_empty;
577 ike_sa_id_t *id;
578
579 id = this->ike_sa->get_id(this->ike_sa);
580 if (this->old_sa)
581 {
582 /* rekeying: Include old SKd, use old PRF, apply SPI */
583 old_keymat = (keymat_v2_t*)this->old_sa->get_keymat(this->old_sa);
584 prf_alg = old_keymat->get_skd(old_keymat, &skd);
585 if (this->initiator)
586 {
587 id->set_responder_spi(id, this->proposal->get_spi(this->proposal));
588 }
589 else
590 {
591 id->set_initiator_spi(id, this->proposal->get_spi(this->proposal));
592 }
593 }
594 if (!this->keymat->derive_ike_keys(this->keymat, this->proposal, this->dh,
595 nonce_i, nonce_r, id, prf_alg, skd))
596 {
597 return FALSE;
598 }
599 charon->bus->ike_keys(charon->bus, this->ike_sa, this->dh, chunk_empty,
600 nonce_i, nonce_r, this->old_sa, NULL);
601 return TRUE;
602 }
603
604 METHOD(task_t, build_r, status_t,
605 private_ike_init_t *this, message_t *message)
606 {
607 identification_t *gateway;
608
609 /* check if we have everything we need */
610 if (this->proposal == NULL ||
611 this->other_nonce.len == 0 || this->my_nonce.len == 0)
612 {
613 DBG1(DBG_IKE, "received proposals inacceptable");
614 message->add_notify(message, TRUE, NO_PROPOSAL_CHOSEN, chunk_empty);
615 return FAILED;
616 }
617 this->ike_sa->set_proposal(this->ike_sa, this->proposal);
618
619 /* check if we'd have to redirect the client */
620 if (!this->old_sa &&
621 this->ike_sa->supports_extension(this->ike_sa, EXT_IKE_REDIRECTION) &&
622 charon->redirect->redirect_on_init(charon->redirect, this->ike_sa,
623 &gateway))
624 {
625 chunk_t data;
626
627 DBG1(DBG_IKE, "redirecting peer to %Y", gateway);
628 data = redirect_data_create(gateway, this->other_nonce);
629 message->add_notify(message, TRUE, REDIRECT, data);
630 gateway->destroy(gateway);
631 chunk_free(&data);
632 return FAILED;
633 }
634
635 if (this->dh == NULL ||
636 !this->proposal->has_dh_group(this->proposal, this->dh_group))
637 {
638 uint16_t group;
639
640 if (this->proposal->get_algorithm(this->proposal, DIFFIE_HELLMAN_GROUP,
641 &group, NULL))
642 {
643 DBG1(DBG_IKE, "DH group %N inacceptable, requesting %N",
644 diffie_hellman_group_names, this->dh_group,
645 diffie_hellman_group_names, group);
646 this->dh_group = group;
647 group = htons(group);
648 message->add_notify(message, FALSE, INVALID_KE_PAYLOAD,
649 chunk_from_thing(group));
650 }
651 else
652 {
653 DBG1(DBG_IKE, "no acceptable proposal found");
654 }
655 return FAILED;
656 }
657
658 if (this->dh_failed)
659 {
660 DBG1(DBG_IKE, "applying DH public value failed");
661 message->add_notify(message, TRUE, NO_PROPOSAL_CHOSEN, chunk_empty);
662 return FAILED;
663 }
664
665 if (!derive_keys(this, this->other_nonce, this->my_nonce))
666 {
667 DBG1(DBG_IKE, "key derivation failed");
668 message->add_notify(message, TRUE, NO_PROPOSAL_CHOSEN, chunk_empty);
669 return FAILED;
670 }
671 if (!build_payloads(this, message))
672 {
673 message->add_notify(message, TRUE, NO_PROPOSAL_CHOSEN, chunk_empty);
674 return FAILED;
675 }
676 return SUCCESS;
677 }
678
679 /**
680 * Raise alerts for received notify errors
681 */
682 static void raise_alerts(private_ike_init_t *this, notify_type_t type)
683 {
684 linked_list_t *list;
685
686 switch (type)
687 {
688 case NO_PROPOSAL_CHOSEN:
689 list = this->config->get_proposals(this->config);
690 charon->bus->alert(charon->bus, ALERT_PROPOSAL_MISMATCH_IKE, list);
691 list->destroy_offset(list, offsetof(proposal_t, destroy));
692 break;
693 default:
694 break;
695 }
696 }
697
698 METHOD(task_t, pre_process_i, status_t,
699 private_ike_init_t *this, message_t *message)
700 {
701 enumerator_t *enumerator;
702 payload_t *payload;
703
704 /* check for erroneous notifies */
705 enumerator = message->create_payload_enumerator(message);
706 while (enumerator->enumerate(enumerator, &payload))
707 {
708 if (payload->get_type(payload) == PLV2_NOTIFY)
709 {
710 notify_payload_t *notify = (notify_payload_t*)payload;
711 notify_type_t type = notify->get_notify_type(notify);
712
713 switch (type)
714 {
715 case REDIRECT:
716 {
717 identification_t *gateway;
718 chunk_t data, nonce = chunk_empty;
719 status_t status = SUCCESS;
720
721 if (this->old_sa)
722 {
723 break;
724 }
725 data = notify->get_notification_data(notify);
726 gateway = redirect_data_parse(data, &nonce);
727 if (!gateway || !chunk_equals(nonce, this->my_nonce))
728 {
729 DBG1(DBG_IKE, "received invalid REDIRECT notify");
730 status = FAILED;
731 }
732 DESTROY_IF(gateway);
733 chunk_free(&nonce);
734 enumerator->destroy(enumerator);
735 return status;
736 }
737 default:
738 break;
739 }
740 }
741 }
742 enumerator->destroy(enumerator);
743 return SUCCESS;
744 }
745
746 METHOD(task_t, process_i, status_t,
747 private_ike_init_t *this, message_t *message)
748 {
749 enumerator_t *enumerator;
750 payload_t *payload;
751
752 /* check for erroneous notifies */
753 enumerator = message->create_payload_enumerator(message);
754 while (enumerator->enumerate(enumerator, &payload))
755 {
756 if (payload->get_type(payload) == PLV2_NOTIFY)
757 {
758 notify_payload_t *notify = (notify_payload_t*)payload;
759 notify_type_t type = notify->get_notify_type(notify);
760
761 switch (type)
762 {
763 case INVALID_KE_PAYLOAD:
764 {
765 chunk_t data;
766 diffie_hellman_group_t bad_group;
767
768 bad_group = this->dh_group;
769 data = notify->get_notification_data(notify);
770 this->dh_group = ntohs(*((uint16_t*)data.ptr));
771 DBG1(DBG_IKE, "peer didn't accept DH group %N, "
772 "it requested %N", diffie_hellman_group_names,
773 bad_group, diffie_hellman_group_names, this->dh_group);
774
775 if (this->old_sa == NULL)
776 { /* reset the IKE_SA if we are not rekeying */
777 this->ike_sa->reset(this->ike_sa);
778 }
779
780 enumerator->destroy(enumerator);
781 this->retry++;
782 return NEED_MORE;
783 }
784 case NAT_DETECTION_SOURCE_IP:
785 case NAT_DETECTION_DESTINATION_IP:
786 /* skip, handled in ike_natd_t */
787 break;
788 case MULTIPLE_AUTH_SUPPORTED:
789 /* handled in ike_auth_t */
790 break;
791 case COOKIE:
792 {
793 chunk_free(&this->cookie);
794 this->cookie = chunk_clone(notify->get_notification_data(notify));
795 this->ike_sa->reset(this->ike_sa);
796 enumerator->destroy(enumerator);
797 DBG2(DBG_IKE, "received %N notify", notify_type_names, type);
798 this->retry++;
799 return NEED_MORE;
800 }
801 case REDIRECT:
802 {
803 identification_t *gateway;
804 chunk_t data, nonce = chunk_empty;
805 status_t status = FAILED;
806
807 if (this->old_sa)
808 {
809 DBG1(DBG_IKE, "received REDIRECT notify during rekeying"
810 ", ignored");
811 break;
812 }
813 data = notify->get_notification_data(notify);
814 gateway = redirect_data_parse(data, &nonce);
815 if (this->ike_sa->handle_redirect(this->ike_sa, gateway))
816 {
817 status = NEED_MORE;
818 }
819 DESTROY_IF(gateway);
820 chunk_free(&nonce);
821 enumerator->destroy(enumerator);
822 return status;
823 }
824 default:
825 {
826 if (type <= 16383)
827 {
828 DBG1(DBG_IKE, "received %N notify error",
829 notify_type_names, type);
830 enumerator->destroy(enumerator);
831 raise_alerts(this, type);
832 return FAILED;
833 }
834 DBG2(DBG_IKE, "received %N notify",
835 notify_type_names, type);
836 break;
837 }
838 }
839 }
840 }
841 enumerator->destroy(enumerator);
842
843 process_payloads(this, message);
844
845 /* check if we have everything */
846 if (this->proposal == NULL ||
847 this->other_nonce.len == 0 || this->my_nonce.len == 0)
848 {
849 DBG1(DBG_IKE, "peers proposal selection invalid");
850 return FAILED;
851 }
852 this->ike_sa->set_proposal(this->ike_sa, this->proposal);
853
854 if (this->dh == NULL ||
855 !this->proposal->has_dh_group(this->proposal, this->dh_group))
856 {
857 DBG1(DBG_IKE, "peer DH group selection invalid");
858 return FAILED;
859 }
860
861 if (this->dh_failed)
862 {
863 DBG1(DBG_IKE, "applying DH public value failed");
864 return FAILED;
865 }
866
867 if (!derive_keys(this, this->my_nonce, this->other_nonce))
868 {
869 DBG1(DBG_IKE, "key derivation failed");
870 return FAILED;
871 }
872 return SUCCESS;
873 }
874
875 METHOD(task_t, get_type, task_type_t,
876 private_ike_init_t *this)
877 {
878 return TASK_IKE_INIT;
879 }
880
881 METHOD(task_t, migrate, void,
882 private_ike_init_t *this, ike_sa_t *ike_sa)
883 {
884 DESTROY_IF(this->proposal);
885 chunk_free(&this->other_nonce);
886
887 this->ike_sa = ike_sa;
888 this->keymat = (keymat_v2_t*)ike_sa->get_keymat(ike_sa);
889 this->proposal = NULL;
890 this->dh_failed = FALSE;
891 if (this->dh && this->dh->get_dh_group(this->dh) != this->dh_group)
892 { /* reset DH value only if group changed (INVALID_KE_PAYLOAD) */
893 this->dh->destroy(this->dh);
894 this->dh = this->keymat->keymat.create_dh(&this->keymat->keymat,
895 this->dh_group);
896 }
897 }
898
899 METHOD(task_t, destroy, void,
900 private_ike_init_t *this)
901 {
902 DESTROY_IF(this->dh);
903 DESTROY_IF(this->proposal);
904 DESTROY_IF(this->nonceg);
905 chunk_free(&this->my_nonce);
906 chunk_free(&this->other_nonce);
907 chunk_free(&this->cookie);
908 free(this);
909 }
910
911 METHOD(ike_init_t, get_lower_nonce, chunk_t,
912 private_ike_init_t *this)
913 {
914 if (memcmp(this->my_nonce.ptr, this->other_nonce.ptr,
915 min(this->my_nonce.len, this->other_nonce.len)) < 0)
916 {
917 return this->my_nonce;
918 }
919 else
920 {
921 return this->other_nonce;
922 }
923 }
924
925 /*
926 * Described in header.
927 */
928 ike_init_t *ike_init_create(ike_sa_t *ike_sa, bool initiator, ike_sa_t *old_sa)
929 {
930 private_ike_init_t *this;
931
932 INIT(this,
933 .public = {
934 .task = {
935 .get_type = _get_type,
936 .migrate = _migrate,
937 .destroy = _destroy,
938 },
939 .get_lower_nonce = _get_lower_nonce,
940 },
941 .ike_sa = ike_sa,
942 .initiator = initiator,
943 .dh_group = MODP_NONE,
944 .keymat = (keymat_v2_t*)ike_sa->get_keymat(ike_sa),
945 .old_sa = old_sa,
946 .signature_authentication = lib->settings->get_bool(lib->settings,
947 "%s.signature_authentication", TRUE, lib->ns),
948 .follow_redirects = lib->settings->get_bool(lib->settings,
949 "%s.follow_redirects", TRUE, lib->ns),
950 );
951 this->nonceg = this->keymat->keymat.create_nonce_gen(&this->keymat->keymat);
952
953 if (initiator)
954 {
955 this->public.task.build = _build_i;
956 this->public.task.process = _process_i;
957 this->public.task.pre_process = _pre_process_i;
958 }
959 else
960 {
961 this->public.task.build = _build_r;
962 this->public.task.process = _process_r;
963 }
964 return &this->public;
965 }