Source/charon/sa/states/responder_init.c

   1 /**
   2  * @file responder_init.c
   3  *
   4  * @brief Start state of a IKE_SA as responder
   5  *
   6  */
   7
   8 /*
   9  * Copyright (C) 2005 Jan Hutter, Martin Willi
  10  * Hochschule fuer Technik Rapperswil
  11  *
  12  * This program is free software; you can redistribute it and/or modify it
  13  * under the terms of the GNU General Public License as published by the
  14  * Free Software Foundation; either version 2 of the License, or (at your
  15  * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
  16  *
  17  * This program is distributed in the hope that it will be useful, but
  18  * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  19  * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  20  * for more details.
  21  */
  22
  23 #include "responder_init.h"
  24
  25 #include <globals.h>
  26 #include <sa/states/state.h>
  27 #include <sa/states/ike_sa_init_responded.h>
  28 #include <utils/allocator.h>
  29 #include <encoding/payloads/sa_payload.h>
  30 #include <encoding/payloads/ke_payload.h>
  31 #include <encoding/payloads/nonce_payload.h>
  32 #include <transforms/diffie_hellman.h>
  33
  34
  35 typedef struct private_responder_init_t private_responder_init_t;
  36
  37 /**
  38  * Private data of a responder_init_t object.
  39  *
  40  */
  41 struct private_responder_init_t {
  42         /**
  43          * Methods of the state_t interface.
  44          */
  45         responder_init_t public;
  46
  47         /**
  48          * Assigned IKE_SA.
  49          */
  50         protected_ike_sa_t *ike_sa;
  51
  52         /**
  53          * Diffie Hellman object used to compute shared secret.
  54          *
  55          * After processing of incoming IKE_SA_INIT-Request the shared key is
  56          * passed to the next state of type ike_sa_init_responded_t.
  57          */
  58         diffie_hellman_t *diffie_hellman;
  59
  60         /**
  61          * Diffie Hellman group number.
  62          */
  63         u_int16_t dh_group_number;
  64
  65         /**
  66          * Priority used to get matching dh_group number.
  67          */
  68         u_int16_t dh_group_priority;
  69
  70         /**
  71          * Sent nonce value.
  72          *
  73          * This value is passed to the next state of type ike_sa_init_responded_t.
  74          */
  75         chunk_t sent_nonce;
  76
  77         /**
  78          * Received nonce value
  79          *
  80          * This value is passed to the next state of type ike_sa_init_responded_t.
  81          */
  82         chunk_t received_nonce;
  83
  84         /**
  85          * Logger used to log data
  86          *
  87          * Is logger of ike_sa!
  88          */
  89         logger_t *logger;
  90
  91         /**
  92          * Proposals used to initiate connection
  93          */
  94         linked_list_t *proposals;
  95
  96         /**
  97          * Builds the SA payload for this state.
  98          *
  99          * @param this          calling object
 100          * @param payload       The generated SA payload object of type ke_payload_t is
 101          *                                      stored at this location.
 102          * @return
 103          *                                      - SUCCESS
 104          *                                      - OUT_OF_RES
 105          */
 106         status_t (*build_sa_payload) (private_responder_init_t *this, payload_t **payload);
 107
 108         /**
 109          * Builds the KE payload for this state.
 110          *
 111          * @param this          calling object
 112          * @param payload       The generated KE payload object of type ke_payload_t is
 113          *                                      stored at this location.
 114          * @return
 115          *                                      - SUCCESS
 116          *                                      - OUT_OF_RES
 117          */
 118         status_t (*build_ke_payload) (private_responder_init_t *this, payload_t **payload);
 119         /**
 120          * Builds the NONCE payload for this state.
 121          *
 122          * @param this          calling object
 123          * @param payload       The generated NONCE payload object of type ke_payload_t is
 124          *                                      stored at this location.
 125          * @return
 126          *                                      - SUCCESS
 127          *                                      - OUT_OF_RES
 128          */
 129         status_t (*build_nonce_payload) (private_responder_init_t *this, payload_t **payload);
 130
 131         /**
 132          * Destroy function called internally of this class after state change succeeded.
 133          *
 134          * This destroy function does not destroy objects which were passed to the new state.
 135          *
 136          * @param this          calling object
 137          * @return                      SUCCESS in any case
 138          */
 139         status_t (*destroy_after_state_change) (private_responder_init_t *this);
 140 };
 141
 142 /**
 143  * Implements state_t.get_state
 144  */
 145 static status_t process_message(private_responder_init_t *this, message_t *message, state_t **new_state)
 146 {
 147         linked_list_iterator_t *payloads;
 148         host_t *source, *destination;
 149         status_t status;
 150         message_t *response;
 151         payload_t *payload;
 152         packet_t *packet;
 153         chunk_t shared_secret;
 154         exchange_type_t exchange_type;
 155         ike_sa_init_responded_t *next_state;
 156
 157         exchange_type = message->get_exchange_type(message);
 158         if (exchange_type != IKE_SA_INIT)
 159         {
 160                 this->logger->log(this->logger, ERROR | MORE, "Message of type %s not supported in state responder_init",mapping_find(exchange_type_m,exchange_type));
 161                 return FAILED;
 162         }
 163
 164         if (!message->get_request(message))
 165         {
 166                 this->logger->log(this->logger, ERROR | MORE, "Only requests of type IKE_SA_INIT supported in state responder_init");
 167                 return FAILED;
 168         }
 169
 170         /* this is the first message we process, so copy host infos */
 171         message->get_source(message, &source);
 172         message->get_destination(message, &destination);
 173
 174         /* we need to clone them, since we destroy the message later */
 175         destination->clone(destination, &(this->ike_sa->me.host));
 176         source->clone(source, &(this->ike_sa->other.host));
 177
 178         /* parse incoming message */
 179         status = message->parse_body(message);
 180         if (status != SUCCESS)
 181         {
 182                 this->logger->log(this->logger, ERROR | MORE, "Could not parse body of request message");
 183                 return status;
 184         }
 185
 186         /* iterate over incoming payloads. We can be sure, the message contains only accepted payloads! */
 187         status = message->get_payload_iterator(message, &payloads);
 188         if (status != SUCCESS)
 189         {
 190                 this->logger->log(this->logger, ERROR, "Fatal error: Could not get payload interator");
 191                 return status;
 192         }
 193
 194         while (payloads->has_next(payloads))
 195         {
 196                 payload_t *payload;
 197
 198                 /* get current payload */
 199                 payloads->current(payloads, (void**)&payload);
 200
 201                 this->logger->log(this->logger, CONTROL|MORE, "Processing payload of type %s", mapping_find(payload_type_m, payload->get_type(payload)));
 202                 switch (payload->get_type(payload))
 203                 {
 204                         case SECURITY_ASSOCIATION:
 205                         {
 206                                 sa_payload_t *sa_payload = (sa_payload_t*)payload;
 207                                 linked_list_iterator_t *suggested_proposals, *accepted_proposals;
 208                                 encryption_algorithm_t          encryption_algorithm = ENCR_UNDEFINED;
 209                                 pseudo_random_function_t                pseudo_random_function = PRF_UNDEFINED;
 210                                 integrity_algorithm_t           integrity_algorithm = AUTH_UNDEFINED;
 211
 212                                 status = this->proposals->create_iterator(this->proposals, &accepted_proposals, FALSE);
 213                                 if (status != SUCCESS)
 214                                 {
 215                                         this->logger->log(this->logger, ERROR, "Fatal error: Could not create iterator on list for proposals");
 216                                         payloads->destroy(payloads);
 217                                         return status;
 218                                 }
 219
 220                                 /* get the list of suggested proposals */
 221                                 status = sa_payload->create_proposal_substructure_iterator(sa_payload, &suggested_proposals, TRUE);
 222                                 if (status != SUCCESS)
 223                                 {
 224                                         this->logger->log(this->logger, ERROR, "Fatal error: Could not create iterator on suggested proposals");
 225                                         accepted_proposals->destroy(accepted_proposals);
 226                                         payloads->destroy(payloads);
 227                                         return status;
 228                                 }
 229
 230                                 /* now let the configuration-manager select a subset of the proposals */
 231                                 status = global_configuration_manager->select_proposals_for_host(global_configuration_manager,
 232                                                                         this->ike_sa->other.host, suggested_proposals, accepted_proposals);
 233                                 if (status != SUCCESS)
 234                                 {
 235                                         this->logger->log(this->logger, CONTROL | MORE, "No proposal of suggested proposals selected");
 236                                         suggested_proposals->destroy(suggested_proposals);
 237                                         accepted_proposals->destroy(accepted_proposals);
 238                                         payloads->destroy(payloads);
 239                                         return status;
 240                                 }
 241
 242                                 /* iterators are not needed anymore */
 243                                 suggested_proposals->destroy(suggested_proposals);
 244
 245
 246                                 /* now let the configuration-manager return the transforms for the given proposal*/
 247                                 this->logger->log(this->logger, CONTROL | MOST, "Get transforms for accepted proposal");
 248                                 status = global_configuration_manager->get_transforms_for_host_and_proposals(global_configuration_manager,
 249                                                                         this->ike_sa->other.host, accepted_proposals, &encryption_algorithm,&pseudo_random_function,&integrity_algorithm);
 250                                 if (status != SUCCESS)
 251                                 {
 252                                         this->logger->log(this->logger, ERROR | MORE, "Accepted proposals not supported?!");
 253                                         accepted_proposals->destroy(accepted_proposals);
 254                                         payloads->destroy(payloads);
 255                                         return status;
 256                                 }
 257                                 accepted_proposals->destroy(accepted_proposals);
 258
 259                                 this->ike_sa->prf = prf_create(pseudo_random_function);
 260                                 if (this->ike_sa->prf == NULL)
 261                                 {
 262                                         this->logger->log(this->logger, ERROR | MORE, "PRF type not supported");
 263                                         payloads->destroy(payloads);
 264                                         return FAILED;
 265                                 }
 266
 267                                 this->logger->log(this->logger, CONTROL | MORE, "SA Payload processed");
 268                                 /* ok, we have what we need for sa_payload (proposals are stored in this->proposals)*/
 269                                 break;
 270                         }
 271                         case KEY_EXCHANGE:
 272                         {
 273                                 ke_payload_t *ke_payload = (ke_payload_t*)payload;
 274                                 diffie_hellman_group_t group;
 275                                 diffie_hellman_t *dh;
 276                                 bool allowed_group;
 277
 278                                 group = ke_payload->get_dh_group_number(ke_payload);
 279
 280                                 status = global_configuration_manager->is_dh_group_allowed_for_host(global_configuration_manager,
 281                                                                 this->ike_sa->other.host, group, &allowed_group);
 282
 283                                 if (status != SUCCESS)
 284                                 {
 285                                         this->logger->log(this->logger, ERROR | MORE, "Could not get informations about DH group");
 286                                         payloads->destroy(payloads);
 287                                         return status;
 288                                 }
 289                                 if (!allowed_group)
 290                                 {
 291                                         /** @todo Send info reply */
 292                                 }
 293
 294                                 /* create diffie hellman object to handle DH exchange */
 295                                 dh = diffie_hellman_create(group);
 296                                 if (dh == NULL)
 297                                 {
 298                                         this->logger->log(this->logger, ERROR, "Could not generate DH object");
 299                                         payloads->destroy(payloads);
 300                                         return OUT_OF_RES;
 301                                 }
 302
 303                                 this->logger->log(this->logger, CONTROL | MORE, "Set other DH public value");
 304
 305                                 status = dh->set_other_public_value(dh, ke_payload->get_key_exchange_data(ke_payload));
 306                                 if (status != SUCCESS)
 307                                 {
 308                                         this->logger->log(this->logger, ERROR, "Could not set other DH public value");
 309                                         dh->destroy(dh);
 310                                         payloads->destroy(payloads);
 311                                         return OUT_OF_RES;
 312                                 }
 313
 314                                 this->diffie_hellman = dh;
 315
 316                                 this->logger->log(this->logger, CONTROL | MORE, "KE Payload processed");
 317                                 break;
 318                         }
 319                         case NONCE:
 320                         {
 321                                 nonce_payload_t *nonce_payload = (nonce_payload_t*)payload;
 322
 323                                 if (this->received_nonce.ptr != NULL)
 324                                 {
 325                                         this->logger->log(this->logger, CONTROL | MOST, "Destroy stored received nonce");
 326                                         allocator_free(this->received_nonce.ptr);
 327                                         this->received_nonce.ptr = NULL;
 328                                         this->received_nonce.len = 0;
 329                                 }
 330
 331                                 this->logger->log(this->logger, CONTROL | MORE, "Get nonce value and store it");
 332                                 status = nonce_payload->get_nonce(nonce_payload, &(this->received_nonce));
 333                                 if (status != SUCCESS)
 334                                 {
 335                                         this->logger->log(this->logger, ERROR, "Fatal error: Could not get nonce");
 336                                         payloads->destroy(payloads);
 337                                         return OUT_OF_RES;
 338                                 }
 339
 340                                 this->logger->log(this->logger, CONTROL | MORE, "Nonce Payload processed");
 341                                 break;
 342                         }
 343                         default:
 344                         {
 345                                 this->logger->log(this->logger, ERROR | MORE, "Payload type not supported!");
 346                                 payloads->destroy(payloads);
 347                                 return OUT_OF_RES;
 348                         }
 349
 350                 }
 351
 352         }
 353         /* iterator can be destroyed */
 354         payloads->destroy(payloads);
 355
 356         this->logger->log(this->logger, CONTROL | MORE, "Request successfully handled. Going to create reply.");
 357
 358         this->logger->log(this->logger, CONTROL | MOST, "Going to create nonce.");
 359         if (this->ike_sa->randomizer->allocate_pseudo_random_bytes(this->ike_sa->randomizer, NONCE_SIZE, &(this->sent_nonce)) != SUCCESS)
 360         {
 361                 this->logger->log(this->logger, ERROR, "Could not create nonce!");
 362                 return OUT_OF_RES;
 363         }
 364
 365         /* store shared secret  */
 366         this->logger->log(this->logger, CONTROL | MOST, "Retrieve shared secret and store it");
 367         status = this->diffie_hellman->get_shared_secret(this->diffie_hellman, &shared_secret);
 368         this->logger->log_chunk(this->logger, PRIVATE, "Shared secret", &shared_secret);
 369
 370         status = this->ike_sa->compute_secrets(this->ike_sa,shared_secret,this->received_nonce, this->sent_nonce);
 371         if (status != SUCCESS)
 372         {
 373                 /* secrets could not be computed */
 374                 this->logger->log(this->logger, ERROR | MORE, "Secrets could not be computed!");
 375                 return status;
 376         }
 377
 378
 379
 380         /* set up the reply */
 381         status = this->ike_sa->build_message(this->ike_sa, IKE_SA_INIT, FALSE, &response);
 382         if (status != SUCCESS)
 383         {
 384                 this->logger->log(this->logger, ERROR, "Could not create empty message");
 385                 return status;
 386         }
 387
 388         /* build SA payload */
 389         status = this->build_sa_payload(this, &payload);
 390         if (status != SUCCESS)
 391         {
 392                 this->logger->log(this->logger, ERROR, "Could not build SA payload");
 393                 return status;
 394         }
 395
 396         this    ->logger->log(this->logger, CONTROL|MOST, "add SA payload to message");
 397         status = response->add_payload(response, payload);
 398         if (status != SUCCESS)
 399         {
 400                 this->logger->log(this->logger, ERROR, "Could not add SA payload to message");
 401                 return status;
 402         }
 403
 404         /* build KE payload */
 405         status = this->build_ke_payload(this,&payload);
 406         if (status != SUCCESS)
 407         {
 408                 this->logger->log(this->logger, ERROR, "Could not build KE payload");
 409                 return status;
 410         }
 411
 412         this    ->logger->log(this->logger, CONTROL|MOST, "add KE payload to message");
 413         status = response->add_payload(response, payload);
 414         if (status != SUCCESS)
 415         {
 416                 this->logger->log(this->logger, ERROR, "Could not add KE payload to message");
 417                 return status;
 418         }
 419
 420         /* build Nonce payload */
 421         status = this->build_nonce_payload(this, &payload);
 422         if (status != SUCCESS)
 423         {
 424                 this->logger->log(this->logger, ERROR, "Could not build NONCE payload");
 425                 return status;
 426         }
 427
 428         this    ->logger->log(this->logger, CONTROL|MOST, "add nonce payload to message");
 429         status = response->add_payload(response, payload);
 430         if (status != SUCCESS)
 431         {
 432                 this->logger->log(this->logger, ERROR, "Could not add nonce payload to message");
 433                 return status;
 434         }
 435
 436         /* generate packet */
 437         this    ->logger->log(this->logger, CONTROL|MOST, "generate packet from message");
 438         status = response->generate(response, &packet);
 439         if (status != SUCCESS)
 440         {
 441                 this->logger->log(this->logger, ERROR, "Fatal error: could not generate packet from message");
 442                 return status;
 443         }
 444
 445         this    ->logger->log(this->logger, CONTROL|MOST, "Add packet to global send queue");
 446         status = global_send_queue->add(global_send_queue, packet);
 447         if (status != SUCCESS)
 448         {
 449                 this->logger->log(this->logger, ERROR, "Could not add packet to send queue");
 450                 return status;
 451         }
 452
 453         /* state can now be changed */
 454         this    ->logger->log(this->logger, CONTROL|MOST, "Create next state object");
 455
 456         next_state = ike_sa_init_responded_create(this->ike_sa, shared_secret, this->received_nonce, this->sent_nonce);
 457
 458         if (next_state == NULL)
 459         {
 460                 this    ->logger->log(this->logger, ERROR, "Fatal error: could not create next state object of type ike_sa_init_responded_t");
 461                 allocator_free_chunk(shared_secret);
 462                 return FAILED;
 463         }
 464
 465         if (    this->ike_sa->last_responded_message != NULL)
 466         {
 467                 /* destroy message */
 468                 this    ->logger->log(this->logger, CONTROL|MOST, "Destroy stored last responded message");
 469                 this->ike_sa->last_responded_message->destroy(this->ike_sa->last_responded_message);
 470         }
 471         this->ike_sa->last_responded_message     = response;
 472
 473         /* message counter can now be increased */
 474         this    ->logger->log(this->logger, CONTROL|MOST, "Increate message counter for incoming messages");
 475         this->ike_sa->message_id_in++;
 476
 477         *new_state = (state_t *) next_state;
 478         /* state has NOW changed :-) */
 479         this    ->logger->log(this->logger, CONTROL|MORE, "Changed state of IKE_SA from %s to %s",mapping_find(ike_sa_state_m,RESPONDER_INIT),mapping_find(ike_sa_state_m,IKE_SA_INIT_RESPONDED) );
 480
 481         this    ->logger->log(this->logger, CONTROL|MOST, "Destroy old sate object");
 482         this->destroy_after_state_change(this);
 483
 484         return SUCCESS;
 485 }
 486
 487 /**
 488  * implements private_initiator_init_t.build_sa_payload
 489  */
 490 static status_t build_sa_payload(private_responder_init_t *this, payload_t **payload)
 491 {
 492         sa_payload_t* sa_payload;
 493         linked_list_iterator_t *proposal_iterator;
 494         status_t status;
 495
 496
 497         /* SA payload takes proposals from this->ike_sa_init_data.proposals and writes them to the created sa_payload */
 498
 499         this->logger->log(this->logger, CONTROL|MORE, "building sa payload");
 500
 501         status = this->proposals->create_iterator(this->proposals, &proposal_iterator, FALSE);
 502         if (status != SUCCESS)
 503         {
 504                 this->logger->log(this->logger, ERROR, "Fatal error: Could not create iterator on list for proposals");
 505                 return status;
 506         }
 507
 508         sa_payload = sa_payload_create();
 509         if (sa_payload == NULL)
 510         {
 511                 this->logger->log(this->logger, ERROR, "Fatal error: Could not create SA payload object");
 512                 return OUT_OF_RES;
 513         }
 514
 515         while (proposal_iterator->has_next(proposal_iterator))
 516         {
 517                 proposal_substructure_t *current_proposal;
 518                 proposal_substructure_t *current_proposal_clone;
 519                 status = proposal_iterator->current(proposal_iterator,(void **) &current_proposal);
 520                 if (status != SUCCESS)
 521                 {
 522                         this->logger->log(this->logger, ERROR, "Could not get current proposal needed to copy");
 523                         proposal_iterator->destroy(proposal_iterator);
 524                         sa_payload->destroy(sa_payload);
 525                         return status;
 526                 }
 527                 status = current_proposal->clone(current_proposal,&current_proposal_clone);
 528                 if (status != SUCCESS)
 529                 {
 530                         this->logger->log(this->logger, ERROR, "Could not clone current proposal");
 531                         proposal_iterator->destroy(proposal_iterator);
 532                         sa_payload->destroy(sa_payload);
 533                         return status;
 534                 }
 535
 536                 status = sa_payload->add_proposal_substructure(sa_payload,current_proposal_clone);
 537                 if (status != SUCCESS)
 538                 {
 539                         this->logger->log(this->logger, ERROR, "Could not add cloned proposal to SA payload");
 540                         proposal_iterator->destroy(proposal_iterator);
 541                         sa_payload->destroy(sa_payload);
 542                         return status;
 543                 }
 544
 545         }
 546
 547         proposal_iterator->destroy(proposal_iterator);
 548
 549         this->logger->log(this->logger, CONTROL|MORE, "sa payload builded");
 550
 551         *payload = (payload_t *) sa_payload;
 552
 553         return SUCCESS;
 554 }
 555
 556 /**
 557  * implements private_initiator_init_t.build_ke_payload
 558  */
 559 static status_t build_ke_payload(private_responder_init_t *this, payload_t **payload)
 560 {
 561         ke_payload_t *ke_payload;
 562         chunk_t key_data;
 563         status_t status;
 564
 565         this->logger->log(this->logger, CONTROL|MORE, "building ke payload");
 566
 567
 568         this    ->logger->log(this->logger, CONTROL|MORE, "get public dh value to send in ke payload");
 569         status = this->diffie_hellman->get_my_public_value(this->diffie_hellman,&key_data);
 570         if (status != SUCCESS)
 571         {
 572                 this->logger->log(this->logger, ERROR, "Could not get my DH public value");
 573                 return status;
 574         }
 575
 576         ke_payload = ke_payload_create();
 577         if (ke_payload == NULL)
 578         {
 579                 this->logger->log(this->logger, ERROR, "Could not create KE payload");
 580                 allocator_free_chunk(key_data);
 581                 return OUT_OF_RES;
 582         }
 583         ke_payload->set_dh_group_number(ke_payload, MODP_1024_BIT);
 584         if (ke_payload->set_key_exchange_data(ke_payload, key_data) != SUCCESS)
 585         {
 586                 this->logger->log(this->logger, ERROR, "Could not set key exchange data of KE payload");
 587                 ke_payload->destroy(ke_payload);
 588                 allocator_free_chunk(key_data);
 589                 return OUT_OF_RES;
 590         }
 591         allocator_free_chunk(key_data);
 592
 593         *payload = (payload_t *) ke_payload;
 594         return SUCCESS;
 595 }
 596
 597 /**
 598  * implements private_initiator_init_t.build_nonce_payload
 599  */
 600 static status_t build_nonce_payload(private_responder_init_t *this, payload_t **payload)
 601 {
 602         nonce_payload_t *nonce_payload;
 603         status_t status;
 604
 605         this->logger->log(this->logger, CONTROL|MORE, "building nonce payload");
 606
 607         nonce_payload = nonce_payload_create();
 608         if (nonce_payload == NULL)
 609         {
 610                 this->logger->log(this->logger, ERROR, "Fatal error: could not create nonce payload object");
 611                 return OUT_OF_RES;
 612         }
 613
 614         status = nonce_payload->set_nonce(nonce_payload, this->sent_nonce);
 615
 616         if (status != SUCCESS)
 617         {
 618                 this->logger->log(this->logger, ERROR, "Fatal error: could not set nonce data of payload");
 619                 nonce_payload->destroy(nonce_payload);
 620                 return status;
 621         }
 622
 623         *payload = (payload_t *) nonce_payload;
 624
 625         return SUCCESS;
 626 }
 627
 628
 629 /**
 630  * Implements state_t.get_state
 631  */
 632 static ike_sa_state_t get_state(private_responder_init_t *this)
 633 {
 634         return RESPONDER_INIT;
 635 }
 636
 637 /**
 638  * Implements state_t.get_state
 639  */
 640 static status_t destroy(private_responder_init_t *this)
 641 {
 642         this->logger->log(this->logger, CONTROL | MORE, "Going to destroy responder init state object");
 643
 644         /* destroy stored proposal */
 645         this->logger->log(this->logger, CONTROL | MOST, "Destroy stored proposals");
 646         while (this->proposals->get_count(this->proposals) > 0)
 647         {
 648                 proposal_substructure_t *current_proposal;
 649                 this->proposals->remove_first(this->proposals,(void **)&current_proposal);
 650                 current_proposal->destroy(current_proposal);
 651         }
 652         this->proposals->destroy(this->proposals);
 653
 654         if (this->sent_nonce.ptr != NULL)
 655         {
 656                 this->logger->log(this->logger, CONTROL | MOST, "Destroy sent nonce");
 657                 allocator_free(this->sent_nonce.ptr);
 658         }
 659
 660         if (this->received_nonce.ptr != NULL)
 661         {
 662                 this->logger->log(this->logger, CONTROL | MOST, "Destroy received nonce");
 663                 allocator_free(this->received_nonce.ptr);
 664         }
 665
 666         /* destroy diffie hellman object */
 667         if (this->diffie_hellman != NULL)
 668         {
 669                 this->logger->log(this->logger, CONTROL | MOST, "Destroy diffie_hellman_t object");
 670                 this->diffie_hellman->destroy(this->diffie_hellman);
 671         }
 672
 673         allocator_free(this);
 674
 675         return SUCCESS;
 676
 677 }
 678
 679 /**
 680  * Implements private_responder_init_t.destroy_after_state_change
 681  */
 682 static status_t destroy_after_state_change (private_responder_init_t *this)
 683 {
 684         this->logger->log(this->logger, CONTROL | MORE, "Going to destroy responder_init_t state object");
 685
 686         /* destroy stored proposal */
 687         this->logger->log(this->logger, CONTROL | MOST, "Destroy stored proposals");
 688         while (this->proposals->get_count(this->proposals) > 0)
 689         {
 690                 proposal_substructure_t *current_proposal;
 691                 this->proposals->remove_first(this->proposals,(void **)&current_proposal);
 692                 current_proposal->destroy(current_proposal);
 693         }
 694         this->proposals->destroy(this->proposals);
 695
 696         /* destroy diffie hellman object */
 697         if (this->diffie_hellman != NULL)
 698         {
 699                 this->logger->log(this->logger, CONTROL | MOST, "Destroy diffie_hellman_t object");
 700                 this->diffie_hellman->destroy(this->diffie_hellman);
 701         }
 702
 703         allocator_free(this);
 704         return SUCCESS;
 705 }
 706
 707 /*
 708  * Described in header.
 709  */
 710 responder_init_t *responder_init_create(protected_ike_sa_t *ike_sa)
 711 {
 712         private_responder_init_t *this = allocator_alloc_thing(private_responder_init_t);
 713
 714         if (this == NULL)
 715         {
 716                 return NULL;
 717         }
 718
 719         /* interface functions */
 720         this->public.state_interface.process_message = (status_t (*) (state_t *,message_t *,state_t **)) process_message;
 721         this->public.state_interface.get_state = (ike_sa_state_t (*) (state_t *)) get_state;
 722         this->public.state_interface.destroy  = (status_t (*) (state_t *)) destroy;
 723
 724         /* private functions */
 725         this->build_sa_payload = build_sa_payload;
 726         this->build_ke_payload = build_ke_payload;
 727         this->build_nonce_payload = build_nonce_payload;
 728         this->destroy_after_state_change = destroy_after_state_change;
 729
 730         /* private data */
 731         this->ike_sa = ike_sa;
 732         this->logger = this->ike_sa->logger;
 733         this->sent_nonce.ptr = NULL;
 734         this->sent_nonce.len = 0;
 735         this->received_nonce.ptr = NULL;
 736         this->received_nonce.len = 0;
 737         this->proposals = linked_list_create();
 738         if (this->proposals == NULL)
 739         {
 740                 allocator_free(this);
 741                 return NULL;
 742         }
 743
 744         return &(this->public);
 745 }