ike-init: Send REDIRECTED_FROM instead of REDIRECT_SUPPORTED if appropriate
[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_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 u_int16_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;
377
378 proposal_list = sa_payload->get_proposals(sa_payload);
379 private = this->ike_sa->supports_extension(this->ike_sa,
380 EXT_STRONGSWAN);
381 this->proposal = this->config->select_proposal(this->config,
382 proposal_list, private);
383 if (!this->proposal)
384 {
385 charon->bus->alert(charon->bus, ALERT_PROPOSAL_MISMATCH_IKE,
386 proposal_list);
387 }
388 proposal_list->destroy_offset(proposal_list,
389 offsetof(proposal_t, destroy));
390 break;
391 }
392 case PLV2_KEY_EXCHANGE:
393 {
394 ke_payload = (ke_payload_t*)payload;
395
396 this->dh_group = ke_payload->get_dh_group_number(ke_payload);
397 break;
398 }
399 case PLV2_NONCE:
400 {
401 nonce_payload_t *nonce_payload = (nonce_payload_t*)payload;
402
403 this->other_nonce = nonce_payload->get_nonce(nonce_payload);
404 break;
405 }
406 case PLV2_NOTIFY:
407 {
408 notify_payload_t *notify = (notify_payload_t*)payload;
409
410 switch (notify->get_notify_type(notify))
411 {
412 case FRAGMENTATION_SUPPORTED:
413 this->ike_sa->enable_extension(this->ike_sa,
414 EXT_IKE_FRAGMENTATION);
415 break;
416 case SIGNATURE_HASH_ALGORITHMS:
417 if (this->signature_authentication)
418 {
419 handle_supported_hash_algorithms(this, notify);
420 }
421 break;
422 case REDIRECT_SUPPORTED:
423 this->ike_sa->enable_extension(this->ike_sa,
424 EXT_IKE_REDIRECTION);
425 break;
426 default:
427 /* other notifies are handled elsewhere */
428 break;
429 }
430
431 }
432 default:
433 break;
434 }
435 }
436 enumerator->destroy(enumerator);
437
438 if (ke_payload && this->proposal &&
439 this->proposal->has_dh_group(this->proposal, this->dh_group))
440 {
441 if (!this->initiator)
442 {
443 this->dh = this->keymat->keymat.create_dh(
444 &this->keymat->keymat, this->dh_group);
445 }
446 if (this->dh)
447 {
448 this->dh_failed = !this->dh->set_other_public_value(this->dh,
449 ke_payload->get_key_exchange_data(ke_payload));
450 }
451 }
452 }
453
454 METHOD(task_t, build_i, status_t,
455 private_ike_init_t *this, message_t *message)
456 {
457 this->config = this->ike_sa->get_ike_cfg(this->ike_sa);
458 DBG0(DBG_IKE, "initiating IKE_SA %s[%d] to %H",
459 this->ike_sa->get_name(this->ike_sa),
460 this->ike_sa->get_unique_id(this->ike_sa),
461 this->ike_sa->get_other_host(this->ike_sa));
462 this->ike_sa->set_state(this->ike_sa, IKE_CONNECTING);
463
464 if (this->retry >= MAX_RETRIES)
465 {
466 DBG1(DBG_IKE, "giving up after %d retries", MAX_RETRIES);
467 return FAILED;
468 }
469
470 /* if the DH group is set via use_dh_group(), we already have a DH object */
471 if (!this->dh)
472 {
473 this->dh_group = this->config->get_dh_group(this->config);
474 this->dh = this->keymat->keymat.create_dh(&this->keymat->keymat,
475 this->dh_group);
476 if (!this->dh)
477 {
478 DBG1(DBG_IKE, "configured DH group %N not supported",
479 diffie_hellman_group_names, this->dh_group);
480 return FAILED;
481 }
482 }
483
484 /* generate nonce only when we are trying the first time */
485 if (this->my_nonce.ptr == NULL)
486 {
487 if (!generate_nonce(this))
488 {
489 return FAILED;
490 }
491 }
492
493 if (this->cookie.ptr)
494 {
495 message->add_notify(message, FALSE, COOKIE, this->cookie);
496 }
497
498 if (!build_payloads(this, message))
499 {
500 return FAILED;
501 }
502
503 #ifdef ME
504 {
505 chunk_t connect_id = this->ike_sa->get_connect_id(this->ike_sa);
506 if (connect_id.ptr)
507 {
508 message->add_notify(message, FALSE, ME_CONNECTID, connect_id);
509 }
510 }
511 #endif /* ME */
512
513 return NEED_MORE;
514 }
515
516 METHOD(task_t, process_r, status_t,
517 private_ike_init_t *this, message_t *message)
518 {
519 this->config = this->ike_sa->get_ike_cfg(this->ike_sa);
520 DBG0(DBG_IKE, "%H is initiating an IKE_SA", message->get_source(message));
521 this->ike_sa->set_state(this->ike_sa, IKE_CONNECTING);
522
523 if (!generate_nonce(this))
524 {
525 return FAILED;
526 }
527
528 #ifdef ME
529 {
530 notify_payload_t *notify = message->get_notify(message, ME_CONNECTID);
531 if (notify)
532 {
533 chunk_t connect_id = notify->get_notification_data(notify);
534 DBG2(DBG_IKE, "received ME_CONNECTID %#B", &connect_id);
535 charon->connect_manager->stop_checks(charon->connect_manager,
536 connect_id);
537 }
538 }
539 #endif /* ME */
540
541 process_payloads(this, message);
542
543 return NEED_MORE;
544 }
545
546 /**
547 * Derive the keymat for the IKE_SA
548 */
549 static bool derive_keys(private_ike_init_t *this,
550 chunk_t nonce_i, chunk_t nonce_r)
551 {
552 keymat_v2_t *old_keymat;
553 pseudo_random_function_t prf_alg = PRF_UNDEFINED;
554 chunk_t skd = chunk_empty;
555 ike_sa_id_t *id;
556
557 id = this->ike_sa->get_id(this->ike_sa);
558 if (this->old_sa)
559 {
560 /* rekeying: Include old SKd, use old PRF, apply SPI */
561 old_keymat = (keymat_v2_t*)this->old_sa->get_keymat(this->old_sa);
562 prf_alg = old_keymat->get_skd(old_keymat, &skd);
563 if (this->initiator)
564 {
565 id->set_responder_spi(id, this->proposal->get_spi(this->proposal));
566 }
567 else
568 {
569 id->set_initiator_spi(id, this->proposal->get_spi(this->proposal));
570 }
571 }
572 if (!this->keymat->derive_ike_keys(this->keymat, this->proposal, this->dh,
573 nonce_i, nonce_r, id, prf_alg, skd))
574 {
575 return FALSE;
576 }
577 charon->bus->ike_keys(charon->bus, this->ike_sa, this->dh, chunk_empty,
578 nonce_i, nonce_r, this->old_sa, NULL);
579 return TRUE;
580 }
581
582 METHOD(task_t, build_r, status_t,
583 private_ike_init_t *this, message_t *message)
584 {
585 identification_t *gateway;
586
587 /* check if we have everything we need */
588 if (this->proposal == NULL ||
589 this->other_nonce.len == 0 || this->my_nonce.len == 0)
590 {
591 DBG1(DBG_IKE, "received proposals inacceptable");
592 message->add_notify(message, TRUE, NO_PROPOSAL_CHOSEN, chunk_empty);
593 return FAILED;
594 }
595 this->ike_sa->set_proposal(this->ike_sa, this->proposal);
596
597 /* check if we'd have to redirect the client */
598 if (this->ike_sa->supports_extension(this->ike_sa, EXT_IKE_REDIRECTION) &&
599 charon->redirect->redirect_on_init(charon->redirect, this->ike_sa,
600 &gateway))
601 {
602 chunk_t data;
603
604 DBG1(DBG_IKE, "redirecting peer to %Y", gateway);
605 data = redirect_data_create(gateway, this->other_nonce);
606 message->add_notify(message, TRUE, REDIRECT, data);
607 gateway->destroy(gateway);
608 chunk_free(&data);
609 return FAILED;
610 }
611
612 if (this->dh == NULL ||
613 !this->proposal->has_dh_group(this->proposal, this->dh_group))
614 {
615 u_int16_t group;
616
617 if (this->proposal->get_algorithm(this->proposal, DIFFIE_HELLMAN_GROUP,
618 &group, NULL))
619 {
620 DBG1(DBG_IKE, "DH group %N inacceptable, requesting %N",
621 diffie_hellman_group_names, this->dh_group,
622 diffie_hellman_group_names, group);
623 this->dh_group = group;
624 group = htons(group);
625 message->add_notify(message, FALSE, INVALID_KE_PAYLOAD,
626 chunk_from_thing(group));
627 }
628 else
629 {
630 DBG1(DBG_IKE, "no acceptable proposal found");
631 }
632 return FAILED;
633 }
634
635 if (this->dh_failed)
636 {
637 DBG1(DBG_IKE, "applying DH public value failed");
638 message->add_notify(message, TRUE, NO_PROPOSAL_CHOSEN, chunk_empty);
639 return FAILED;
640 }
641
642 if (!derive_keys(this, this->other_nonce, this->my_nonce))
643 {
644 DBG1(DBG_IKE, "key derivation failed");
645 message->add_notify(message, TRUE, NO_PROPOSAL_CHOSEN, chunk_empty);
646 return FAILED;
647 }
648 if (!build_payloads(this, message))
649 {
650 message->add_notify(message, TRUE, NO_PROPOSAL_CHOSEN, chunk_empty);
651 return FAILED;
652 }
653 return SUCCESS;
654 }
655
656 /**
657 * Raise alerts for received notify errors
658 */
659 static void raise_alerts(private_ike_init_t *this, notify_type_t type)
660 {
661 linked_list_t *list;
662
663 switch (type)
664 {
665 case NO_PROPOSAL_CHOSEN:
666 list = this->config->get_proposals(this->config);
667 charon->bus->alert(charon->bus, ALERT_PROPOSAL_MISMATCH_IKE, list);
668 list->destroy_offset(list, offsetof(proposal_t, destroy));
669 break;
670 default:
671 break;
672 }
673 }
674
675 METHOD(task_t, process_i, status_t,
676 private_ike_init_t *this, message_t *message)
677 {
678 enumerator_t *enumerator;
679 payload_t *payload;
680
681 /* check for erroneous notifies */
682 enumerator = message->create_payload_enumerator(message);
683 while (enumerator->enumerate(enumerator, &payload))
684 {
685 if (payload->get_type(payload) == PLV2_NOTIFY)
686 {
687 notify_payload_t *notify = (notify_payload_t*)payload;
688 notify_type_t type = notify->get_notify_type(notify);
689
690 switch (type)
691 {
692 case INVALID_KE_PAYLOAD:
693 {
694 chunk_t data;
695 diffie_hellman_group_t bad_group;
696
697 bad_group = this->dh_group;
698 data = notify->get_notification_data(notify);
699 this->dh_group = ntohs(*((u_int16_t*)data.ptr));
700 DBG1(DBG_IKE, "peer didn't accept DH group %N, "
701 "it requested %N", diffie_hellman_group_names,
702 bad_group, diffie_hellman_group_names, this->dh_group);
703
704 if (this->old_sa == NULL)
705 { /* reset the IKE_SA if we are not rekeying */
706 this->ike_sa->reset(this->ike_sa);
707 }
708
709 enumerator->destroy(enumerator);
710 this->retry++;
711 return NEED_MORE;
712 }
713 case NAT_DETECTION_SOURCE_IP:
714 case NAT_DETECTION_DESTINATION_IP:
715 /* skip, handled in ike_natd_t */
716 break;
717 case MULTIPLE_AUTH_SUPPORTED:
718 /* handled in ike_auth_t */
719 break;
720 case COOKIE:
721 {
722 chunk_free(&this->cookie);
723 this->cookie = chunk_clone(notify->get_notification_data(notify));
724 this->ike_sa->reset(this->ike_sa);
725 enumerator->destroy(enumerator);
726 DBG2(DBG_IKE, "received %N notify", notify_type_names, type);
727 this->retry++;
728 return NEED_MORE;
729 }
730 case REDIRECT:
731 {
732 identification_t *gateway;
733 chunk_t data, nonce = chunk_empty;
734 status_t status = FAILED;
735
736 data = notify->get_notification_data(notify);
737 gateway = redirect_data_parse(data, &nonce);
738 enumerator->destroy(enumerator);
739 if (!gateway || !chunk_equals(nonce, this->my_nonce))
740 {
741 DBG1(DBG_IKE, "received invalid REDIRECT notify");
742 }
743 else if (this->ike_sa->handle_redirect(this->ike_sa,
744 gateway))
745 {
746 status = NEED_MORE;
747 }
748 DESTROY_IF(gateway);
749 chunk_free(&nonce);
750 return status;
751 }
752 default:
753 {
754 if (type <= 16383)
755 {
756 DBG1(DBG_IKE, "received %N notify error",
757 notify_type_names, type);
758 enumerator->destroy(enumerator);
759 raise_alerts(this, type);
760 return FAILED;
761 }
762 DBG2(DBG_IKE, "received %N notify",
763 notify_type_names, type);
764 break;
765 }
766 }
767 }
768 }
769 enumerator->destroy(enumerator);
770
771 process_payloads(this, message);
772
773 /* check if we have everything */
774 if (this->proposal == NULL ||
775 this->other_nonce.len == 0 || this->my_nonce.len == 0)
776 {
777 DBG1(DBG_IKE, "peers proposal selection invalid");
778 return FAILED;
779 }
780 this->ike_sa->set_proposal(this->ike_sa, this->proposal);
781
782 if (this->dh == NULL ||
783 !this->proposal->has_dh_group(this->proposal, this->dh_group))
784 {
785 DBG1(DBG_IKE, "peer DH group selection invalid");
786 return FAILED;
787 }
788
789 if (this->dh_failed)
790 {
791 DBG1(DBG_IKE, "applying DH public value failed");
792 return FAILED;
793 }
794
795 if (!derive_keys(this, this->my_nonce, this->other_nonce))
796 {
797 DBG1(DBG_IKE, "key derivation failed");
798 return FAILED;
799 }
800 return SUCCESS;
801 }
802
803 METHOD(task_t, get_type, task_type_t,
804 private_ike_init_t *this)
805 {
806 return TASK_IKE_INIT;
807 }
808
809 METHOD(task_t, migrate, void,
810 private_ike_init_t *this, ike_sa_t *ike_sa)
811 {
812 DESTROY_IF(this->proposal);
813 chunk_free(&this->other_nonce);
814
815 this->ike_sa = ike_sa;
816 this->keymat = (keymat_v2_t*)ike_sa->get_keymat(ike_sa);
817 this->proposal = NULL;
818 this->dh_failed = FALSE;
819 if (this->dh && this->dh->get_dh_group(this->dh) != this->dh_group)
820 { /* reset DH value only if group changed (INVALID_KE_PAYLOAD) */
821 this->dh->destroy(this->dh);
822 this->dh = this->keymat->keymat.create_dh(&this->keymat->keymat,
823 this->dh_group);
824 }
825 }
826
827 METHOD(task_t, destroy, void,
828 private_ike_init_t *this)
829 {
830 DESTROY_IF(this->dh);
831 DESTROY_IF(this->proposal);
832 DESTROY_IF(this->nonceg);
833 chunk_free(&this->my_nonce);
834 chunk_free(&this->other_nonce);
835 chunk_free(&this->cookie);
836 free(this);
837 }
838
839 METHOD(ike_init_t, get_lower_nonce, chunk_t,
840 private_ike_init_t *this)
841 {
842 if (memcmp(this->my_nonce.ptr, this->other_nonce.ptr,
843 min(this->my_nonce.len, this->other_nonce.len)) < 0)
844 {
845 return this->my_nonce;
846 }
847 else
848 {
849 return this->other_nonce;
850 }
851 }
852
853 /*
854 * Described in header.
855 */
856 ike_init_t *ike_init_create(ike_sa_t *ike_sa, bool initiator, ike_sa_t *old_sa)
857 {
858 private_ike_init_t *this;
859
860 INIT(this,
861 .public = {
862 .task = {
863 .get_type = _get_type,
864 .migrate = _migrate,
865 .destroy = _destroy,
866 },
867 .get_lower_nonce = _get_lower_nonce,
868 },
869 .ike_sa = ike_sa,
870 .initiator = initiator,
871 .dh_group = MODP_NONE,
872 .keymat = (keymat_v2_t*)ike_sa->get_keymat(ike_sa),
873 .old_sa = old_sa,
874 .signature_authentication = lib->settings->get_bool(lib->settings,
875 "%s.signature_authentication", TRUE, lib->ns),
876 .follow_redirects = lib->settings->get_bool(lib->settings,
877 "%s.follow_redirects", TRUE, lib->ns),
878 );
879 this->nonceg = this->keymat->keymat.create_nonce_gen(&this->keymat->keymat);
880
881 if (initiator)
882 {
883 this->public.task.build = _build_i;
884 this->public.task.process = _process_i;
885 }
886 else
887 {
888 this->public.task.build = _build_r;
889 this->public.task.process = _process_r;
890 }
891 return &this->public;
892 }