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                 message->add_notify(message, FALSE, REDIRECT_SUPPORTED, chunk_empty);
 336         }
 337         return TRUE;
 338 }
 339
 340 /**
 341  * Read payloads from message
 342  */
 343 static void process_payloads(private_ike_init_t *this, message_t *message)
 344 {
 345         enumerator_t *enumerator;
 346         payload_t *payload;
 347         ke_payload_t *ke_payload = NULL;
 348
 349         enumerator = message->create_payload_enumerator(message);
 350         while (enumerator->enumerate(enumerator, &payload))
 351         {
 352                 switch (payload->get_type(payload))
 353                 {
 354                         case PLV2_SECURITY_ASSOCIATION:
 355                         {
 356                                 sa_payload_t *sa_payload = (sa_payload_t*)payload;
 357                                 linked_list_t *proposal_list;
 358                                 bool private;
 359
 360                                 proposal_list = sa_payload->get_proposals(sa_payload);
 361                                 private = this->ike_sa->supports_extension(this->ike_sa,
 362                                                                                                                    EXT_STRONGSWAN);
 363                                 this->proposal = this->config->select_proposal(this->config,
 364                                                                                                                 proposal_list, private);
 365                                 if (!this->proposal)
 366                                 {
 367                                         charon->bus->alert(charon->bus, ALERT_PROPOSAL_MISMATCH_IKE,
 368                                                                            proposal_list);
 369                                 }
 370                                 proposal_list->destroy_offset(proposal_list,
 371                                                                                           offsetof(proposal_t, destroy));
 372                                 break;
 373                         }
 374                         case PLV2_KEY_EXCHANGE:
 375                         {
 376                                 ke_payload = (ke_payload_t*)payload;
 377
 378                                 this->dh_group = ke_payload->get_dh_group_number(ke_payload);
 379                                 break;
 380                         }
 381                         case PLV2_NONCE:
 382                         {
 383                                 nonce_payload_t *nonce_payload = (nonce_payload_t*)payload;
 384
 385                                 this->other_nonce = nonce_payload->get_nonce(nonce_payload);
 386                                 break;
 387                         }
 388                         case PLV2_NOTIFY:
 389                         {
 390                                 notify_payload_t *notify = (notify_payload_t*)payload;
 391
 392                                 switch (notify->get_notify_type(notify))
 393                                 {
 394                                         case FRAGMENTATION_SUPPORTED:
 395                                                 this->ike_sa->enable_extension(this->ike_sa,
 396                                                                                                            EXT_IKE_FRAGMENTATION);
 397                                                 break;
 398                                         case SIGNATURE_HASH_ALGORITHMS:
 399                                                 if (this->signature_authentication)
 400                                                 {
 401                                                         handle_supported_hash_algorithms(this, notify);
 402                                                 }
 403                                                 break;
 404                                         case REDIRECT_SUPPORTED:
 405                                                 this->ike_sa->enable_extension(this->ike_sa,
 406                                                                                                            EXT_IKE_REDIRECTION);
 407                                                 break;
 408                                         default:
 409                                                 /* other notifies are handled elsewhere */
 410                                                 break;
 411                                 }
 412
 413                         }
 414                         default:
 415                                 break;
 416                 }
 417         }
 418         enumerator->destroy(enumerator);
 419
 420         if (ke_payload && this->proposal &&
 421                 this->proposal->has_dh_group(this->proposal, this->dh_group))
 422         {
 423                 if (!this->initiator)
 424                 {
 425                         this->dh = this->keymat->keymat.create_dh(
 426                                                                 &this->keymat->keymat, this->dh_group);
 427                 }
 428                 if (this->dh)
 429                 {
 430                         this->dh_failed = !this->dh->set_other_public_value(this->dh,
 431                                                                 ke_payload->get_key_exchange_data(ke_payload));
 432                 }
 433         }
 434 }
 435
 436 METHOD(task_t, build_i, status_t,
 437         private_ike_init_t *this, message_t *message)
 438 {
 439         this->config = this->ike_sa->get_ike_cfg(this->ike_sa);
 440         DBG0(DBG_IKE, "initiating IKE_SA %s[%d] to %H",
 441                  this->ike_sa->get_name(this->ike_sa),
 442                  this->ike_sa->get_unique_id(this->ike_sa),
 443                  this->ike_sa->get_other_host(this->ike_sa));
 444         this->ike_sa->set_state(this->ike_sa, IKE_CONNECTING);
 445
 446         if (this->retry >= MAX_RETRIES)
 447         {
 448                 DBG1(DBG_IKE, "giving up after %d retries", MAX_RETRIES);
 449                 return FAILED;
 450         }
 451
 452         /* if the DH group is set via use_dh_group(), we already have a DH object */
 453         if (!this->dh)
 454         {
 455                 this->dh_group = this->config->get_dh_group(this->config);
 456                 this->dh = this->keymat->keymat.create_dh(&this->keymat->keymat,
 457                                                                                                   this->dh_group);
 458                 if (!this->dh)
 459                 {
 460                         DBG1(DBG_IKE, "configured DH group %N not supported",
 461                                 diffie_hellman_group_names, this->dh_group);
 462                         return FAILED;
 463                 }
 464         }
 465
 466         /* generate nonce only when we are trying the first time */
 467         if (this->my_nonce.ptr == NULL)
 468         {
 469                 if (!generate_nonce(this))
 470                 {
 471                         return FAILED;
 472                 }
 473         }
 474
 475         if (this->cookie.ptr)
 476         {
 477                 message->add_notify(message, FALSE, COOKIE, this->cookie);
 478         }
 479
 480         if (!build_payloads(this, message))
 481         {
 482                 return FAILED;
 483         }
 484
 485 #ifdef ME
 486         {
 487                 chunk_t connect_id = this->ike_sa->get_connect_id(this->ike_sa);
 488                 if (connect_id.ptr)
 489                 {
 490                         message->add_notify(message, FALSE, ME_CONNECTID, connect_id);
 491                 }
 492         }
 493 #endif /* ME */
 494
 495         return NEED_MORE;
 496 }
 497
 498 METHOD(task_t, process_r,  status_t,
 499         private_ike_init_t *this, message_t *message)
 500 {
 501         this->config = this->ike_sa->get_ike_cfg(this->ike_sa);
 502         DBG0(DBG_IKE, "%H is initiating an IKE_SA", message->get_source(message));
 503         this->ike_sa->set_state(this->ike_sa, IKE_CONNECTING);
 504
 505         if (!generate_nonce(this))
 506         {
 507                 return FAILED;
 508         }
 509
 510 #ifdef ME
 511         {
 512                 notify_payload_t *notify = message->get_notify(message, ME_CONNECTID);
 513                 if (notify)
 514                 {
 515                         chunk_t connect_id = notify->get_notification_data(notify);
 516                         DBG2(DBG_IKE, "received ME_CONNECTID %#B", &connect_id);
 517                         charon->connect_manager->stop_checks(charon->connect_manager,
 518                                                                                                  connect_id);
 519                 }
 520         }
 521 #endif /* ME */
 522
 523         process_payloads(this, message);
 524
 525         return NEED_MORE;
 526 }
 527
 528 /**
 529  * Derive the keymat for the IKE_SA
 530  */
 531 static bool derive_keys(private_ike_init_t *this,
 532                                                 chunk_t nonce_i, chunk_t nonce_r)
 533 {
 534         keymat_v2_t *old_keymat;
 535         pseudo_random_function_t prf_alg = PRF_UNDEFINED;
 536         chunk_t skd = chunk_empty;
 537         ike_sa_id_t *id;
 538
 539         id = this->ike_sa->get_id(this->ike_sa);
 540         if (this->old_sa)
 541         {
 542                 /* rekeying: Include old SKd, use old PRF, apply SPI */
 543                 old_keymat = (keymat_v2_t*)this->old_sa->get_keymat(this->old_sa);
 544                 prf_alg = old_keymat->get_skd(old_keymat, &skd);
 545                 if (this->initiator)
 546                 {
 547                         id->set_responder_spi(id, this->proposal->get_spi(this->proposal));
 548                 }
 549                 else
 550                 {
 551                         id->set_initiator_spi(id, this->proposal->get_spi(this->proposal));
 552                 }
 553         }
 554         if (!this->keymat->derive_ike_keys(this->keymat, this->proposal, this->dh,
 555                                                                            nonce_i, nonce_r, id, prf_alg, skd))
 556         {
 557                 return FALSE;
 558         }
 559         charon->bus->ike_keys(charon->bus, this->ike_sa, this->dh, chunk_empty,
 560                                                   nonce_i, nonce_r, this->old_sa, NULL);
 561         return TRUE;
 562 }
 563
 564 METHOD(task_t, build_r, status_t,
 565         private_ike_init_t *this, message_t *message)
 566 {
 567         identification_t *gateway;
 568
 569         /* check if we have everything we need */
 570         if (this->proposal == NULL ||
 571                 this->other_nonce.len == 0 || this->my_nonce.len == 0)
 572         {
 573                 DBG1(DBG_IKE, "received proposals inacceptable");
 574                 message->add_notify(message, TRUE, NO_PROPOSAL_CHOSEN, chunk_empty);
 575                 return FAILED;
 576         }
 577         this->ike_sa->set_proposal(this->ike_sa, this->proposal);
 578
 579         /* check if we'd have to redirect the client */
 580         if (this->ike_sa->supports_extension(this->ike_sa, EXT_IKE_REDIRECTION) &&
 581                 charon->redirect->redirect_on_init(charon->redirect, this->ike_sa,
 582                                                                                    &gateway))
 583         {
 584                 chunk_t data;
 585
 586                 DBG1(DBG_IKE, "redirecting peer to %Y", gateway);
 587                 data = redirect_data_create(gateway, this->other_nonce);
 588                 message->add_notify(message, TRUE, REDIRECT, data);
 589                 gateway->destroy(gateway);
 590                 chunk_free(&data);
 591                 return FAILED;
 592         }
 593
 594         if (this->dh == NULL ||
 595                 !this->proposal->has_dh_group(this->proposal, this->dh_group))
 596         {
 597                 u_int16_t group;
 598
 599                 if (this->proposal->get_algorithm(this->proposal, DIFFIE_HELLMAN_GROUP,
 600                                                                                   &group, NULL))
 601                 {
 602                         DBG1(DBG_IKE, "DH group %N inacceptable, requesting %N",
 603                                  diffie_hellman_group_names, this->dh_group,
 604                                  diffie_hellman_group_names, group);
 605                         this->dh_group = group;
 606                         group = htons(group);
 607                         message->add_notify(message, FALSE, INVALID_KE_PAYLOAD,
 608                                                                 chunk_from_thing(group));
 609                 }
 610                 else
 611                 {
 612                         DBG1(DBG_IKE, "no acceptable proposal found");
 613                 }
 614                 return FAILED;
 615         }
 616
 617         if (this->dh_failed)
 618         {
 619                 DBG1(DBG_IKE, "applying DH public value failed");
 620                 message->add_notify(message, TRUE, NO_PROPOSAL_CHOSEN, chunk_empty);
 621                 return FAILED;
 622         }
 623
 624         if (!derive_keys(this, this->other_nonce, this->my_nonce))
 625         {
 626                 DBG1(DBG_IKE, "key derivation failed");
 627                 message->add_notify(message, TRUE, NO_PROPOSAL_CHOSEN, chunk_empty);
 628                 return FAILED;
 629         }
 630         if (!build_payloads(this, message))
 631         {
 632                 message->add_notify(message, TRUE, NO_PROPOSAL_CHOSEN, chunk_empty);
 633                 return FAILED;
 634         }
 635         return SUCCESS;
 636 }
 637
 638 /**
 639  * Raise alerts for received notify errors
 640  */
 641 static void raise_alerts(private_ike_init_t *this, notify_type_t type)
 642 {
 643         linked_list_t *list;
 644
 645         switch (type)
 646         {
 647                 case NO_PROPOSAL_CHOSEN:
 648                         list = this->config->get_proposals(this->config);
 649                         charon->bus->alert(charon->bus, ALERT_PROPOSAL_MISMATCH_IKE, list);
 650                         list->destroy_offset(list, offsetof(proposal_t, destroy));
 651                         break;
 652                 default:
 653                         break;
 654         }
 655 }
 656
 657 METHOD(task_t, process_i, status_t,
 658         private_ike_init_t *this, message_t *message)
 659 {
 660         enumerator_t *enumerator;
 661         payload_t *payload;
 662
 663         /* check for erroneous notifies */
 664         enumerator = message->create_payload_enumerator(message);
 665         while (enumerator->enumerate(enumerator, &payload))
 666         {
 667                 if (payload->get_type(payload) == PLV2_NOTIFY)
 668                 {
 669                         notify_payload_t *notify = (notify_payload_t*)payload;
 670                         notify_type_t type = notify->get_notify_type(notify);
 671
 672                         switch (type)
 673                         {
 674                                 case INVALID_KE_PAYLOAD:
 675                                 {
 676                                         chunk_t data;
 677                                         diffie_hellman_group_t bad_group;
 678
 679                                         bad_group = this->dh_group;
 680                                         data = notify->get_notification_data(notify);
 681                                         this->dh_group = ntohs(*((u_int16_t*)data.ptr));
 682                                         DBG1(DBG_IKE, "peer didn't accept DH group %N, "
 683                                                  "it requested %N", diffie_hellman_group_names,
 684                                                  bad_group, diffie_hellman_group_names, this->dh_group);
 685
 686                                         if (this->old_sa == NULL)
 687                                         {       /* reset the IKE_SA if we are not rekeying */
 688                                                 this->ike_sa->reset(this->ike_sa);
 689                                         }
 690
 691                                         enumerator->destroy(enumerator);
 692                                         this->retry++;
 693                                         return NEED_MORE;
 694                                 }
 695                                 case NAT_DETECTION_SOURCE_IP:
 696                                 case NAT_DETECTION_DESTINATION_IP:
 697                                         /* skip, handled in ike_natd_t */
 698                                         break;
 699                                 case MULTIPLE_AUTH_SUPPORTED:
 700                                         /* handled in ike_auth_t */
 701                                         break;
 702                                 case COOKIE:
 703                                 {
 704                                         chunk_free(&this->cookie);
 705                                         this->cookie = chunk_clone(notify->get_notification_data(notify));
 706                                         this->ike_sa->reset(this->ike_sa);
 707                                         enumerator->destroy(enumerator);
 708                                         DBG2(DBG_IKE, "received %N notify", notify_type_names, type);
 709                                         this->retry++;
 710                                         return NEED_MORE;
 711                                 }
 712                                 case REDIRECT:
 713                                 {
 714                                         identification_t *gateway;
 715                                         chunk_t data, nonce = chunk_empty;
 716                                         status_t status = FAILED;
 717
 718                                         data = notify->get_notification_data(notify);
 719                                         gateway = redirect_data_parse(data, &nonce);
 720                                         enumerator->destroy(enumerator);
 721                                         if (!gateway || !chunk_equals(nonce, this->my_nonce))
 722                                         {
 723                                                 DBG1(DBG_IKE, "received invalid REDIRECT notify");
 724                                         }
 725                                         else if (this->ike_sa->handle_redirect(this->ike_sa,
 726                                                                                                                         gateway))
 727                                         {
 728                                                 status = NEED_MORE;
 729                                         }
 730                                         DESTROY_IF(gateway);
 731                                         chunk_free(&nonce);
 732                                         return status;
 733                                 }
 734                                 default:
 735                                 {
 736                                         if (type <= 16383)
 737                                         {
 738                                                 DBG1(DBG_IKE, "received %N notify error",
 739                                                          notify_type_names, type);
 740                                                 enumerator->destroy(enumerator);
 741                                                 raise_alerts(this, type);
 742                                                 return FAILED;
 743                                         }
 744                                         DBG2(DBG_IKE, "received %N notify",
 745                                                 notify_type_names, type);
 746                                         break;
 747                                 }
 748                         }
 749                 }
 750         }
 751         enumerator->destroy(enumerator);
 752
 753         process_payloads(this, message);
 754
 755         /* check if we have everything */
 756         if (this->proposal == NULL ||
 757                 this->other_nonce.len == 0 || this->my_nonce.len == 0)
 758         {
 759                 DBG1(DBG_IKE, "peers proposal selection invalid");
 760                 return FAILED;
 761         }
 762         this->ike_sa->set_proposal(this->ike_sa, this->proposal);
 763
 764         if (this->dh == NULL ||
 765                 !this->proposal->has_dh_group(this->proposal, this->dh_group))
 766         {
 767                 DBG1(DBG_IKE, "peer DH group selection invalid");
 768                 return FAILED;
 769         }
 770
 771         if (this->dh_failed)
 772         {
 773                 DBG1(DBG_IKE, "applying DH public value failed");
 774                 return FAILED;
 775         }
 776
 777         if (!derive_keys(this, this->my_nonce, this->other_nonce))
 778         {
 779                 DBG1(DBG_IKE, "key derivation failed");
 780                 return FAILED;
 781         }
 782         return SUCCESS;
 783 }
 784
 785 METHOD(task_t, get_type, task_type_t,
 786         private_ike_init_t *this)
 787 {
 788         return TASK_IKE_INIT;
 789 }
 790
 791 METHOD(task_t, migrate, void,
 792         private_ike_init_t *this, ike_sa_t *ike_sa)
 793 {
 794         DESTROY_IF(this->proposal);
 795         chunk_free(&this->other_nonce);
 796
 797         this->ike_sa = ike_sa;
 798         this->keymat = (keymat_v2_t*)ike_sa->get_keymat(ike_sa);
 799         this->proposal = NULL;
 800         this->dh_failed = FALSE;
 801         if (this->dh && this->dh->get_dh_group(this->dh) != this->dh_group)
 802         {       /* reset DH value only if group changed (INVALID_KE_PAYLOAD) */
 803                 this->dh->destroy(this->dh);
 804                 this->dh = this->keymat->keymat.create_dh(&this->keymat->keymat,
 805                                                                                                   this->dh_group);
 806         }
 807 }
 808
 809 METHOD(task_t, destroy, void,
 810         private_ike_init_t *this)
 811 {
 812         DESTROY_IF(this->dh);
 813         DESTROY_IF(this->proposal);
 814         DESTROY_IF(this->nonceg);
 815         chunk_free(&this->my_nonce);
 816         chunk_free(&this->other_nonce);
 817         chunk_free(&this->cookie);
 818         free(this);
 819 }
 820
 821 METHOD(ike_init_t, get_lower_nonce, chunk_t,
 822         private_ike_init_t *this)
 823 {
 824         if (memcmp(this->my_nonce.ptr, this->other_nonce.ptr,
 825                            min(this->my_nonce.len, this->other_nonce.len)) < 0)
 826         {
 827                 return this->my_nonce;
 828         }
 829         else
 830         {
 831                 return this->other_nonce;
 832         }
 833 }
 834
 835 /*
 836  * Described in header.
 837  */
 838 ike_init_t *ike_init_create(ike_sa_t *ike_sa, bool initiator, ike_sa_t *old_sa)
 839 {
 840         private_ike_init_t *this;
 841
 842         INIT(this,
 843                 .public = {
 844                         .task = {
 845                                 .get_type = _get_type,
 846                                 .migrate = _migrate,
 847                                 .destroy = _destroy,
 848                         },
 849                         .get_lower_nonce = _get_lower_nonce,
 850                 },
 851                 .ike_sa = ike_sa,
 852                 .initiator = initiator,
 853                 .dh_group = MODP_NONE,
 854                 .keymat = (keymat_v2_t*)ike_sa->get_keymat(ike_sa),
 855                 .old_sa = old_sa,
 856                 .signature_authentication = lib->settings->get_bool(lib->settings,
 857                                                                 "%s.signature_authentication", TRUE, lib->ns),
 858                 .follow_redirects = lib->settings->get_bool(lib->settings,
 859                                                                 "%s.follow_redirects", TRUE, lib->ns),
 860         );
 861         this->nonceg = this->keymat->keymat.create_nonce_gen(&this->keymat->keymat);
 862
 863         if (initiator)
 864         {
 865                 this->public.task.build = _build_i;
 866                 this->public.task.process = _process_i;
 867         }
 868         else
 869         {
 870                 this->public.task.build = _build_r;
 871                 this->public.task.process = _process_r;
 872         }
 873         return &this->public;
 874 }