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         return TRUE;
 328 }
 329
 330 /**
 331  * Read payloads from message
 332  */
 333 static void process_payloads(private_ike_init_t *this, message_t *message)
 334 {
 335         enumerator_t *enumerator;
 336         payload_t *payload;
 337         ke_payload_t *ke_payload = NULL;
 338
 339         enumerator = message->create_payload_enumerator(message);
 340         while (enumerator->enumerate(enumerator, &payload))
 341         {
 342                 switch (payload->get_type(payload))
 343                 {
 344                         case PLV2_SECURITY_ASSOCIATION:
 345                         {
 346                                 sa_payload_t *sa_payload = (sa_payload_t*)payload;
 347                                 linked_list_t *proposal_list;
 348                                 bool private;
 349
 350                                 proposal_list = sa_payload->get_proposals(sa_payload);
 351                                 private = this->ike_sa->supports_extension(this->ike_sa,
 352                                                                                                                    EXT_STRONGSWAN);
 353                                 this->proposal = this->config->select_proposal(this->config,
 354                                                                                                                 proposal_list, private);
 355                                 if (!this->proposal)
 356                                 {
 357                                         charon->bus->alert(charon->bus, ALERT_PROPOSAL_MISMATCH_IKE,
 358                                                                            proposal_list);
 359                                 }
 360                                 proposal_list->destroy_offset(proposal_list,
 361                                                                                           offsetof(proposal_t, destroy));
 362                                 break;
 363                         }
 364                         case PLV2_KEY_EXCHANGE:
 365                         {
 366                                 ke_payload = (ke_payload_t*)payload;
 367
 368                                 this->dh_group = ke_payload->get_dh_group_number(ke_payload);
 369                                 break;
 370                         }
 371                         case PLV2_NONCE:
 372                         {
 373                                 nonce_payload_t *nonce_payload = (nonce_payload_t*)payload;
 374
 375                                 this->other_nonce = nonce_payload->get_nonce(nonce_payload);
 376                                 break;
 377                         }
 378                         case PLV2_NOTIFY:
 379                         {
 380                                 notify_payload_t *notify = (notify_payload_t*)payload;
 381
 382                                 switch (notify->get_notify_type(notify))
 383                                 {
 384                                         case FRAGMENTATION_SUPPORTED:
 385                                                 this->ike_sa->enable_extension(this->ike_sa,
 386                                                                                                            EXT_IKE_FRAGMENTATION);
 387                                                 break;
 388                                         case SIGNATURE_HASH_ALGORITHMS:
 389                                                 if (this->signature_authentication)
 390                                                 {
 391                                                         handle_supported_hash_algorithms(this, notify);
 392                                                 }
 393                                                 break;
 394                                         case REDIRECT_SUPPORTED:
 395                                                 this->ike_sa->enable_extension(this->ike_sa,
 396                                                                                                            EXT_IKE_REDIRECTION);
 397                                                 break;
 398                                         default:
 399                                                 /* other notifies are handled elsewhere */
 400                                                 break;
 401                                 }
 402
 403                         }
 404                         default:
 405                                 break;
 406                 }
 407         }
 408         enumerator->destroy(enumerator);
 409
 410         if (ke_payload && this->proposal &&
 411                 this->proposal->has_dh_group(this->proposal, this->dh_group))
 412         {
 413                 if (!this->initiator)
 414                 {
 415                         this->dh = this->keymat->keymat.create_dh(
 416                                                                 &this->keymat->keymat, this->dh_group);
 417                 }
 418                 if (this->dh)
 419                 {
 420                         this->dh_failed = !this->dh->set_other_public_value(this->dh,
 421                                                                 ke_payload->get_key_exchange_data(ke_payload));
 422                 }
 423         }
 424 }
 425
 426 METHOD(task_t, build_i, status_t,
 427         private_ike_init_t *this, message_t *message)
 428 {
 429         this->config = this->ike_sa->get_ike_cfg(this->ike_sa);
 430         DBG0(DBG_IKE, "initiating IKE_SA %s[%d] to %H",
 431                  this->ike_sa->get_name(this->ike_sa),
 432                  this->ike_sa->get_unique_id(this->ike_sa),
 433                  this->ike_sa->get_other_host(this->ike_sa));
 434         this->ike_sa->set_state(this->ike_sa, IKE_CONNECTING);
 435
 436         if (this->retry >= MAX_RETRIES)
 437         {
 438                 DBG1(DBG_IKE, "giving up after %d retries", MAX_RETRIES);
 439                 return FAILED;
 440         }
 441
 442         /* if the DH group is set via use_dh_group(), we already have a DH object */
 443         if (!this->dh)
 444         {
 445                 this->dh_group = this->config->get_dh_group(this->config);
 446                 this->dh = this->keymat->keymat.create_dh(&this->keymat->keymat,
 447                                                                                                   this->dh_group);
 448                 if (!this->dh)
 449                 {
 450                         DBG1(DBG_IKE, "configured DH group %N not supported",
 451                                 diffie_hellman_group_names, this->dh_group);
 452                         return FAILED;
 453                 }
 454         }
 455
 456         /* generate nonce only when we are trying the first time */
 457         if (this->my_nonce.ptr == NULL)
 458         {
 459                 if (!generate_nonce(this))
 460                 {
 461                         return FAILED;
 462                 }
 463         }
 464
 465         if (this->cookie.ptr)
 466         {
 467                 message->add_notify(message, FALSE, COOKIE, this->cookie);
 468         }
 469
 470         if (!build_payloads(this, message))
 471         {
 472                 return FAILED;
 473         }
 474
 475 #ifdef ME
 476         {
 477                 chunk_t connect_id = this->ike_sa->get_connect_id(this->ike_sa);
 478                 if (connect_id.ptr)
 479                 {
 480                         message->add_notify(message, FALSE, ME_CONNECTID, connect_id);
 481                 }
 482         }
 483 #endif /* ME */
 484
 485         return NEED_MORE;
 486 }
 487
 488 METHOD(task_t, process_r,  status_t,
 489         private_ike_init_t *this, message_t *message)
 490 {
 491         this->config = this->ike_sa->get_ike_cfg(this->ike_sa);
 492         DBG0(DBG_IKE, "%H is initiating an IKE_SA", message->get_source(message));
 493         this->ike_sa->set_state(this->ike_sa, IKE_CONNECTING);
 494
 495         if (!generate_nonce(this))
 496         {
 497                 return FAILED;
 498         }
 499
 500 #ifdef ME
 501         {
 502                 notify_payload_t *notify = message->get_notify(message, ME_CONNECTID);
 503                 if (notify)
 504                 {
 505                         chunk_t connect_id = notify->get_notification_data(notify);
 506                         DBG2(DBG_IKE, "received ME_CONNECTID %#B", &connect_id);
 507                         charon->connect_manager->stop_checks(charon->connect_manager,
 508                                                                                                  connect_id);
 509                 }
 510         }
 511 #endif /* ME */
 512
 513         process_payloads(this, message);
 514
 515         return NEED_MORE;
 516 }
 517
 518 /**
 519  * Derive the keymat for the IKE_SA
 520  */
 521 static bool derive_keys(private_ike_init_t *this,
 522                                                 chunk_t nonce_i, chunk_t nonce_r)
 523 {
 524         keymat_v2_t *old_keymat;
 525         pseudo_random_function_t prf_alg = PRF_UNDEFINED;
 526         chunk_t skd = chunk_empty;
 527         ike_sa_id_t *id;
 528
 529         id = this->ike_sa->get_id(this->ike_sa);
 530         if (this->old_sa)
 531         {
 532                 /* rekeying: Include old SKd, use old PRF, apply SPI */
 533                 old_keymat = (keymat_v2_t*)this->old_sa->get_keymat(this->old_sa);
 534                 prf_alg = old_keymat->get_skd(old_keymat, &skd);
 535                 if (this->initiator)
 536                 {
 537                         id->set_responder_spi(id, this->proposal->get_spi(this->proposal));
 538                 }
 539                 else
 540                 {
 541                         id->set_initiator_spi(id, this->proposal->get_spi(this->proposal));
 542                 }
 543         }
 544         if (!this->keymat->derive_ike_keys(this->keymat, this->proposal, this->dh,
 545                                                                            nonce_i, nonce_r, id, prf_alg, skd))
 546         {
 547                 return FALSE;
 548         }
 549         charon->bus->ike_keys(charon->bus, this->ike_sa, this->dh, chunk_empty,
 550                                                   nonce_i, nonce_r, this->old_sa, NULL);
 551         return TRUE;
 552 }
 553
 554 METHOD(task_t, build_r, status_t,
 555         private_ike_init_t *this, message_t *message)
 556 {
 557         /* check if we have everything we need */
 558         if (this->proposal == NULL ||
 559                 this->other_nonce.len == 0 || this->my_nonce.len == 0)
 560         {
 561                 DBG1(DBG_IKE, "received proposals inacceptable");
 562                 message->add_notify(message, TRUE, NO_PROPOSAL_CHOSEN, chunk_empty);
 563                 return FAILED;
 564         }
 565         this->ike_sa->set_proposal(this->ike_sa, this->proposal);
 566
 567         if (this->dh == NULL ||
 568                 !this->proposal->has_dh_group(this->proposal, this->dh_group))
 569         {
 570                 u_int16_t group;
 571
 572                 if (this->proposal->get_algorithm(this->proposal, DIFFIE_HELLMAN_GROUP,
 573                                                                                   &group, NULL))
 574                 {
 575                         DBG1(DBG_IKE, "DH group %N inacceptable, requesting %N",
 576                                  diffie_hellman_group_names, this->dh_group,
 577                                  diffie_hellman_group_names, group);
 578                         this->dh_group = group;
 579                         group = htons(group);
 580                         message->add_notify(message, FALSE, INVALID_KE_PAYLOAD,
 581                                                                 chunk_from_thing(group));
 582                 }
 583                 else
 584                 {
 585                         DBG1(DBG_IKE, "no acceptable proposal found");
 586                 }
 587                 return FAILED;
 588         }
 589
 590         if (this->dh_failed)
 591         {
 592                 DBG1(DBG_IKE, "applying DH public value failed");
 593                 message->add_notify(message, TRUE, NO_PROPOSAL_CHOSEN, chunk_empty);
 594                 return FAILED;
 595         }
 596
 597         if (!derive_keys(this, this->other_nonce, this->my_nonce))
 598         {
 599                 DBG1(DBG_IKE, "key derivation failed");
 600                 message->add_notify(message, TRUE, NO_PROPOSAL_CHOSEN, chunk_empty);
 601                 return FAILED;
 602         }
 603         if (!build_payloads(this, message))
 604         {
 605                 message->add_notify(message, TRUE, NO_PROPOSAL_CHOSEN, chunk_empty);
 606                 return FAILED;
 607         }
 608         return SUCCESS;
 609 }
 610
 611 /**
 612  * Raise alerts for received notify errors
 613  */
 614 static void raise_alerts(private_ike_init_t *this, notify_type_t type)
 615 {
 616         linked_list_t *list;
 617
 618         switch (type)
 619         {
 620                 case NO_PROPOSAL_CHOSEN:
 621                         list = this->config->get_proposals(this->config);
 622                         charon->bus->alert(charon->bus, ALERT_PROPOSAL_MISMATCH_IKE, list);
 623                         list->destroy_offset(list, offsetof(proposal_t, destroy));
 624                         break;
 625                 default:
 626                         break;
 627         }
 628 }
 629
 630 METHOD(task_t, process_i, status_t,
 631         private_ike_init_t *this, message_t *message)
 632 {
 633         enumerator_t *enumerator;
 634         payload_t *payload;
 635
 636         /* check for erroneous notifies */
 637         enumerator = message->create_payload_enumerator(message);
 638         while (enumerator->enumerate(enumerator, &payload))
 639         {
 640                 if (payload->get_type(payload) == PLV2_NOTIFY)
 641                 {
 642                         notify_payload_t *notify = (notify_payload_t*)payload;
 643                         notify_type_t type = notify->get_notify_type(notify);
 644
 645                         switch (type)
 646                         {
 647                                 case INVALID_KE_PAYLOAD:
 648                                 {
 649                                         chunk_t data;
 650                                         diffie_hellman_group_t bad_group;
 651
 652                                         bad_group = this->dh_group;
 653                                         data = notify->get_notification_data(notify);
 654                                         this->dh_group = ntohs(*((u_int16_t*)data.ptr));
 655                                         DBG1(DBG_IKE, "peer didn't accept DH group %N, "
 656                                                  "it requested %N", diffie_hellman_group_names,
 657                                                  bad_group, diffie_hellman_group_names, this->dh_group);
 658
 659                                         if (this->old_sa == NULL)
 660                                         {       /* reset the IKE_SA if we are not rekeying */
 661                                                 this->ike_sa->reset(this->ike_sa);
 662                                         }
 663
 664                                         enumerator->destroy(enumerator);
 665                                         this->retry++;
 666                                         return NEED_MORE;
 667                                 }
 668                                 case NAT_DETECTION_SOURCE_IP:
 669                                 case NAT_DETECTION_DESTINATION_IP:
 670                                         /* skip, handled in ike_natd_t */
 671                                         break;
 672                                 case MULTIPLE_AUTH_SUPPORTED:
 673                                         /* handled in ike_auth_t */
 674                                         break;
 675                                 case COOKIE:
 676                                 {
 677                                         chunk_free(&this->cookie);
 678                                         this->cookie = chunk_clone(notify->get_notification_data(notify));
 679                                         this->ike_sa->reset(this->ike_sa);
 680                                         enumerator->destroy(enumerator);
 681                                         DBG2(DBG_IKE, "received %N notify", notify_type_names, type);
 682                                         this->retry++;
 683                                         return NEED_MORE;
 684                                 }
 685                                 default:
 686                                 {
 687                                         if (type <= 16383)
 688                                         {
 689                                                 DBG1(DBG_IKE, "received %N notify error",
 690                                                          notify_type_names, type);
 691                                                 enumerator->destroy(enumerator);
 692                                                 raise_alerts(this, type);
 693                                                 return FAILED;
 694                                         }
 695                                         DBG2(DBG_IKE, "received %N notify",
 696                                                 notify_type_names, type);
 697                                         break;
 698                                 }
 699                         }
 700                 }
 701         }
 702         enumerator->destroy(enumerator);
 703
 704         process_payloads(this, message);
 705
 706         /* check if we have everything */
 707         if (this->proposal == NULL ||
 708                 this->other_nonce.len == 0 || this->my_nonce.len == 0)
 709         {
 710                 DBG1(DBG_IKE, "peers proposal selection invalid");
 711                 return FAILED;
 712         }
 713         this->ike_sa->set_proposal(this->ike_sa, this->proposal);
 714
 715         if (this->dh == NULL ||
 716                 !this->proposal->has_dh_group(this->proposal, this->dh_group))
 717         {
 718                 DBG1(DBG_IKE, "peer DH group selection invalid");
 719                 return FAILED;
 720         }
 721
 722         if (this->dh_failed)
 723         {
 724                 DBG1(DBG_IKE, "applying DH public value failed");
 725                 return FAILED;
 726         }
 727
 728         if (!derive_keys(this, this->my_nonce, this->other_nonce))
 729         {
 730                 DBG1(DBG_IKE, "key derivation failed");
 731                 return FAILED;
 732         }
 733         return SUCCESS;
 734 }
 735
 736 METHOD(task_t, get_type, task_type_t,
 737         private_ike_init_t *this)
 738 {
 739         return TASK_IKE_INIT;
 740 }
 741
 742 METHOD(task_t, migrate, void,
 743         private_ike_init_t *this, ike_sa_t *ike_sa)
 744 {
 745         DESTROY_IF(this->proposal);
 746         chunk_free(&this->other_nonce);
 747
 748         this->ike_sa = ike_sa;
 749         this->keymat = (keymat_v2_t*)ike_sa->get_keymat(ike_sa);
 750         this->proposal = NULL;
 751         this->dh_failed = FALSE;
 752         if (this->dh && this->dh->get_dh_group(this->dh) != this->dh_group)
 753         {       /* reset DH value only if group changed (INVALID_KE_PAYLOAD) */
 754                 this->dh->destroy(this->dh);
 755                 this->dh = this->keymat->keymat.create_dh(&this->keymat->keymat,
 756                                                                                                   this->dh_group);
 757         }
 758 }
 759
 760 METHOD(task_t, destroy, void,
 761         private_ike_init_t *this)
 762 {
 763         DESTROY_IF(this->dh);
 764         DESTROY_IF(this->proposal);
 765         DESTROY_IF(this->nonceg);
 766         chunk_free(&this->my_nonce);
 767         chunk_free(&this->other_nonce);
 768         chunk_free(&this->cookie);
 769         free(this);
 770 }
 771
 772 METHOD(ike_init_t, get_lower_nonce, chunk_t,
 773         private_ike_init_t *this)
 774 {
 775         if (memcmp(this->my_nonce.ptr, this->other_nonce.ptr,
 776                            min(this->my_nonce.len, this->other_nonce.len)) < 0)
 777         {
 778                 return this->my_nonce;
 779         }
 780         else
 781         {
 782                 return this->other_nonce;
 783         }
 784 }
 785
 786 /*
 787  * Described in header.
 788  */
 789 ike_init_t *ike_init_create(ike_sa_t *ike_sa, bool initiator, ike_sa_t *old_sa)
 790 {
 791         private_ike_init_t *this;
 792
 793         INIT(this,
 794                 .public = {
 795                         .task = {
 796                                 .get_type = _get_type,
 797                                 .migrate = _migrate,
 798                                 .destroy = _destroy,
 799                         },
 800                         .get_lower_nonce = _get_lower_nonce,
 801                 },
 802                 .ike_sa = ike_sa,
 803                 .initiator = initiator,
 804                 .dh_group = MODP_NONE,
 805                 .keymat = (keymat_v2_t*)ike_sa->get_keymat(ike_sa),
 806                 .old_sa = old_sa,
 807                 .signature_authentication = lib->settings->get_bool(lib->settings,
 808                                                                 "%s.signature_authentication", TRUE, lib->ns),
 809         );
 810         this->nonceg = this->keymat->keymat.create_nonce_gen(&this->keymat->keymat);
 811
 812         if (initiator)
 813         {
 814                 this->public.task.build = _build_i;
 815                 this->public.task.process = _process_i;
 816         }
 817         else
 818         {
 819                 this->public.task.build = _build_r;
 820                 this->public.task.process = _process_r;
 821         }
 822         return &this->public;
 823 }