ike-init: Send REDIRECT_SUPPORTED as initiator
[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 /* check if we have everything we need */
563 if (this->proposal == NULL ||
564 this->other_nonce.len == 0 || this->my_nonce.len == 0)
565 {
566 DBG1(DBG_IKE, "received proposals inacceptable");
567 message->add_notify(message, TRUE, NO_PROPOSAL_CHOSEN, chunk_empty);
568 return FAILED;
569 }
570 this->ike_sa->set_proposal(this->ike_sa, this->proposal);
571
572 if (this->dh == NULL ||
573 !this->proposal->has_dh_group(this->proposal, this->dh_group))
574 {
575 u_int16_t group;
576
577 if (this->proposal->get_algorithm(this->proposal, DIFFIE_HELLMAN_GROUP,
578 &group, NULL))
579 {
580 DBG1(DBG_IKE, "DH group %N inacceptable, requesting %N",
581 diffie_hellman_group_names, this->dh_group,
582 diffie_hellman_group_names, group);
583 this->dh_group = group;
584 group = htons(group);
585 message->add_notify(message, FALSE, INVALID_KE_PAYLOAD,
586 chunk_from_thing(group));
587 }
588 else
589 {
590 DBG1(DBG_IKE, "no acceptable proposal found");
591 }
592 return FAILED;
593 }
594
595 if (this->dh_failed)
596 {
597 DBG1(DBG_IKE, "applying DH public value failed");
598 message->add_notify(message, TRUE, NO_PROPOSAL_CHOSEN, chunk_empty);
599 return FAILED;
600 }
601
602 if (!derive_keys(this, this->other_nonce, this->my_nonce))
603 {
604 DBG1(DBG_IKE, "key derivation failed");
605 message->add_notify(message, TRUE, NO_PROPOSAL_CHOSEN, chunk_empty);
606 return FAILED;
607 }
608 if (!build_payloads(this, message))
609 {
610 message->add_notify(message, TRUE, NO_PROPOSAL_CHOSEN, chunk_empty);
611 return FAILED;
612 }
613 return SUCCESS;
614 }
615
616 /**
617 * Raise alerts for received notify errors
618 */
619 static void raise_alerts(private_ike_init_t *this, notify_type_t type)
620 {
621 linked_list_t *list;
622
623 switch (type)
624 {
625 case NO_PROPOSAL_CHOSEN:
626 list = this->config->get_proposals(this->config);
627 charon->bus->alert(charon->bus, ALERT_PROPOSAL_MISMATCH_IKE, list);
628 list->destroy_offset(list, offsetof(proposal_t, destroy));
629 break;
630 default:
631 break;
632 }
633 }
634
635 METHOD(task_t, process_i, status_t,
636 private_ike_init_t *this, message_t *message)
637 {
638 enumerator_t *enumerator;
639 payload_t *payload;
640
641 /* check for erroneous notifies */
642 enumerator = message->create_payload_enumerator(message);
643 while (enumerator->enumerate(enumerator, &payload))
644 {
645 if (payload->get_type(payload) == PLV2_NOTIFY)
646 {
647 notify_payload_t *notify = (notify_payload_t*)payload;
648 notify_type_t type = notify->get_notify_type(notify);
649
650 switch (type)
651 {
652 case INVALID_KE_PAYLOAD:
653 {
654 chunk_t data;
655 diffie_hellman_group_t bad_group;
656
657 bad_group = this->dh_group;
658 data = notify->get_notification_data(notify);
659 this->dh_group = ntohs(*((u_int16_t*)data.ptr));
660 DBG1(DBG_IKE, "peer didn't accept DH group %N, "
661 "it requested %N", diffie_hellman_group_names,
662 bad_group, diffie_hellman_group_names, this->dh_group);
663
664 if (this->old_sa == NULL)
665 { /* reset the IKE_SA if we are not rekeying */
666 this->ike_sa->reset(this->ike_sa);
667 }
668
669 enumerator->destroy(enumerator);
670 this->retry++;
671 return NEED_MORE;
672 }
673 case NAT_DETECTION_SOURCE_IP:
674 case NAT_DETECTION_DESTINATION_IP:
675 /* skip, handled in ike_natd_t */
676 break;
677 case MULTIPLE_AUTH_SUPPORTED:
678 /* handled in ike_auth_t */
679 break;
680 case COOKIE:
681 {
682 chunk_free(&this->cookie);
683 this->cookie = chunk_clone(notify->get_notification_data(notify));
684 this->ike_sa->reset(this->ike_sa);
685 enumerator->destroy(enumerator);
686 DBG2(DBG_IKE, "received %N notify", notify_type_names, type);
687 this->retry++;
688 return NEED_MORE;
689 }
690 default:
691 {
692 if (type <= 16383)
693 {
694 DBG1(DBG_IKE, "received %N notify error",
695 notify_type_names, type);
696 enumerator->destroy(enumerator);
697 raise_alerts(this, type);
698 return FAILED;
699 }
700 DBG2(DBG_IKE, "received %N notify",
701 notify_type_names, type);
702 break;
703 }
704 }
705 }
706 }
707 enumerator->destroy(enumerator);
708
709 process_payloads(this, message);
710
711 /* check if we have everything */
712 if (this->proposal == NULL ||
713 this->other_nonce.len == 0 || this->my_nonce.len == 0)
714 {
715 DBG1(DBG_IKE, "peers proposal selection invalid");
716 return FAILED;
717 }
718 this->ike_sa->set_proposal(this->ike_sa, this->proposal);
719
720 if (this->dh == NULL ||
721 !this->proposal->has_dh_group(this->proposal, this->dh_group))
722 {
723 DBG1(DBG_IKE, "peer DH group selection invalid");
724 return FAILED;
725 }
726
727 if (this->dh_failed)
728 {
729 DBG1(DBG_IKE, "applying DH public value failed");
730 return FAILED;
731 }
732
733 if (!derive_keys(this, this->my_nonce, this->other_nonce))
734 {
735 DBG1(DBG_IKE, "key derivation failed");
736 return FAILED;
737 }
738 return SUCCESS;
739 }
740
741 METHOD(task_t, get_type, task_type_t,
742 private_ike_init_t *this)
743 {
744 return TASK_IKE_INIT;
745 }
746
747 METHOD(task_t, migrate, void,
748 private_ike_init_t *this, ike_sa_t *ike_sa)
749 {
750 DESTROY_IF(this->proposal);
751 chunk_free(&this->other_nonce);
752
753 this->ike_sa = ike_sa;
754 this->keymat = (keymat_v2_t*)ike_sa->get_keymat(ike_sa);
755 this->proposal = NULL;
756 this->dh_failed = FALSE;
757 if (this->dh && this->dh->get_dh_group(this->dh) != this->dh_group)
758 { /* reset DH value only if group changed (INVALID_KE_PAYLOAD) */
759 this->dh->destroy(this->dh);
760 this->dh = this->keymat->keymat.create_dh(&this->keymat->keymat,
761 this->dh_group);
762 }
763 }
764
765 METHOD(task_t, destroy, void,
766 private_ike_init_t *this)
767 {
768 DESTROY_IF(this->dh);
769 DESTROY_IF(this->proposal);
770 DESTROY_IF(this->nonceg);
771 chunk_free(&this->my_nonce);
772 chunk_free(&this->other_nonce);
773 chunk_free(&this->cookie);
774 free(this);
775 }
776
777 METHOD(ike_init_t, get_lower_nonce, chunk_t,
778 private_ike_init_t *this)
779 {
780 if (memcmp(this->my_nonce.ptr, this->other_nonce.ptr,
781 min(this->my_nonce.len, this->other_nonce.len)) < 0)
782 {
783 return this->my_nonce;
784 }
785 else
786 {
787 return this->other_nonce;
788 }
789 }
790
791 /*
792 * Described in header.
793 */
794 ike_init_t *ike_init_create(ike_sa_t *ike_sa, bool initiator, ike_sa_t *old_sa)
795 {
796 private_ike_init_t *this;
797
798 INIT(this,
799 .public = {
800 .task = {
801 .get_type = _get_type,
802 .migrate = _migrate,
803 .destroy = _destroy,
804 },
805 .get_lower_nonce = _get_lower_nonce,
806 },
807 .ike_sa = ike_sa,
808 .initiator = initiator,
809 .dh_group = MODP_NONE,
810 .keymat = (keymat_v2_t*)ike_sa->get_keymat(ike_sa),
811 .old_sa = old_sa,
812 .signature_authentication = lib->settings->get_bool(lib->settings,
813 "%s.signature_authentication", TRUE, lib->ns),
814 );
815 this->nonceg = this->keymat->keymat.create_nonce_gen(&this->keymat->keymat);
816
817 if (initiator)
818 {
819 this->public.task.build = _build_i;
820 this->public.task.process = _process_i;
821 }
822 else
823 {
824 this->public.task.build = _build_r;
825 this->public.task.process = _process_r;
826 }
827 return &this->public;
828 }