programs/charon/charon/sa/states/ike_auth_requested.c

   1 /**
   2  * @file ike_auth_requested.c
   3  *
   4  * @brief Implementation of ike_auth_requested_t.
   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 <string.h>
  24
  25 #include "ike_auth_requested.h"
  26
  27 #include <daemon.h>
  28 #include <encoding/payloads/ts_payload.h>
  29 #include <encoding/payloads/sa_payload.h>
  30 #include <encoding/payloads/id_payload.h>
  31 #include <encoding/payloads/auth_payload.h>
  32 #include <encoding/payloads/notify_payload.h>
  33 #include <crypto/signers/signer.h>
  34 #include <crypto/crypters/crypter.h>
  35 #include <sa/states/ike_sa_established.h>
  36 #include <sa/authenticator.h>
  37 #include <sa/child_sa.h>
  38
  39 typedef struct private_ike_auth_requested_t private_ike_auth_requested_t;
  40
  41 /**
  42  * Private data of a ike_auth_requested_t object.
  43  *
  44  */
  45 struct private_ike_auth_requested_t {
  46         /**
  47          * Public interface of ike_auth_requested_t.
  48          */
  49         ike_auth_requested_t public;
  50
  51         /**
  52          * Assigned IKE_SA.
  53          */
  54          protected_ike_sa_t *ike_sa;
  55
  56         /**
  57          * SA config, just a copy of the one stored in the ike_sa.
  58          */
  59         policy_t *policy;
  60
  61         /**
  62          * Received nonce from responder.
  63          */
  64         chunk_t received_nonce;
  65
  66         /**
  67          * Sent nonce in IKE_SA_INIT request.
  68          */
  69         chunk_t sent_nonce;
  70
  71         /**
  72          * IKE_SA_INIT-Request in binary form.
  73          */
  74         chunk_t ike_sa_init_reply_data;
  75
  76         /**
  77          * Proposal to setup CHILD_SA
  78          */
  79         proposal_t *proposal;
  80
  81         /**
  82          * Traffic selectors applicable at our site
  83          */
  84         linked_list_t *my_ts;
  85
  86         /**
  87          * Traffic selectors applicable at remote site
  88          */
  89         linked_list_t *other_ts;
  90
  91         /**
  92          * Child sa created in ike_sa_init_requested
  93          */
  94         child_sa_t *child_sa;
  95
  96         /**
  97          * Assigned Logger.
  98          *
  99          * Is logger of ike_sa!
 100          */
 101         logger_t *logger;
 102
 103         /**
 104          * Process the IDr payload (check if other id is valid)
 105          *
 106          * @param this                  calling object
 107          * @param idr_payload   ID payload of responder
 108          * @return
 109          *                                              - SUCCESS
 110          *                                              - DELETE_ME
 111          */
 112         status_t (*process_idr_payload) (private_ike_auth_requested_t *this, id_payload_t *idr_payload);
 113
 114         /**
 115          * Process the SA payload (check if selected proposals are valid, setup child sa)
 116          *
 117          * @param this                  calling object
 118          * @param sa_payload    SA payload of responder
 119          *
 120          *                                              - SUCCESS
 121          *                                              - DELETE_ME
 122          */
 123         status_t (*process_sa_payload) (private_ike_auth_requested_t *this, sa_payload_t *sa_payload);
 124
 125         /**
 126          * Process the AUTH payload (check authenticity of message)
 127          *
 128          * @param this                          calling object
 129          * @param auth_payload          AUTH payload of responder
 130          * @param other_id_payload      ID payload of responder
 131          *
 132          *                                              - SUCCESS
 133          *                                              - DELETE_ME
 134          */
 135         status_t (*process_auth_payload) (private_ike_auth_requested_t *this, auth_payload_t *auth_payload, id_payload_t *other_id_payload);
 136
 137         /**
 138          * Process the TS payload (check if selected traffic selectors are valid)
 139          *
 140          * @param this                  calling object
 141          * @param ts_initiator  TRUE if TS payload is TSi, FALSE for TSr
 142          * @param ts_payload    TS payload of responder
 143          *
 144          *                                              - SUCCESS
 145          *                                              - DELETE_ME
 146          */
 147         status_t (*process_ts_payload) (private_ike_auth_requested_t *this, bool ts_initiator, ts_payload_t *ts_payload);
 148
 149         /**
 150          * Process a notify payload
 151          *
 152          * @param this                          calling object
 153          * @param notify_payload        notify payload
 154          *
 155          *                                              - SUCCESS
 156          *                                              - FAILED
 157          *                                              - DELETE_ME
 158          */
 159         status_t (*process_notify_payload) (private_ike_auth_requested_t *this, notify_payload_t *notify_payload);
 160
 161         /**
 162          * Destroy function called internally of this class after state change to
 163          * state IKE_SA_ESTABLISHED succeeded.
 164          *
 165          * This destroy function does not destroy objects which were passed to the new state.
 166          *
 167          * @param this          calling object
 168          */
 169         void (*destroy_after_state_change) (private_ike_auth_requested_t *this);
 170 };
 171
 172
 173 /**
 174  * Implements state_t.process_message
 175  */
 176 static status_t process_message(private_ike_auth_requested_t *this, message_t *ike_auth_reply)
 177 {
 178         ts_payload_t *tsi_payload = NULL, *tsr_payload = NULL;
 179         id_payload_t *idr_payload = NULL;
 180         auth_payload_t *auth_payload = NULL;
 181         sa_payload_t *sa_payload = NULL;
 182         iterator_t *payloads = NULL;
 183         crypter_t *crypter = NULL;
 184         signer_t *signer = NULL;
 185         status_t status;
 186         host_t *my_host, *other_host;
 187         chunk_t seed;
 188         prf_plus_t *prf_plus;
 189         connection_t *connection;
 190
 191         if (ike_auth_reply->get_exchange_type(ike_auth_reply) != IKE_AUTH)
 192         {
 193                 this->logger->log(this->logger, ERROR | LEVEL1, "Message of type %s not supported in state ike_auth_requested",
 194                                                         mapping_find(exchange_type_m,ike_auth_reply->get_exchange_type(ike_auth_reply)));
 195                 return FAILED;
 196         }
 197
 198         if (ike_auth_reply->get_request(ike_auth_reply))
 199         {
 200                 this->logger->log(this->logger, ERROR | LEVEL1, "IKE_AUTH requests not allowed state ike_sa_init_responded");
 201                 return FAILED;
 202         }
 203
 204         /* get signer for verification and crypter for decryption */
 205         signer = this->ike_sa->get_signer_responder(this->ike_sa);
 206         crypter = this->ike_sa->get_crypter_responder(this->ike_sa);
 207
 208         /* parse incoming message */
 209         status = ike_auth_reply->parse_body(ike_auth_reply, crypter, signer);
 210         if (status != SUCCESS)
 211         {
 212                 this->logger->log(this->logger, AUDIT, "IKE_AUTH reply decryption failed. Ignoring message");
 213                 return status;
 214         }
 215
 216         this->policy = this->ike_sa->get_policy(this->ike_sa);
 217
 218         /* we collect all payloads, which are processed later. Notify's are processed
 219          * in place, since we don't know how may are there.
 220          */
 221         payloads = ike_auth_reply->get_payload_iterator(ike_auth_reply);
 222         while (payloads->has_next(payloads))
 223         {
 224                 payload_t *payload;
 225                 payloads->current(payloads, (void**)&payload);
 226
 227                 switch (payload->get_type(payload))
 228                 {
 229                         case AUTHENTICATION:
 230                         {
 231                                 auth_payload = (auth_payload_t*)payload;
 232                                 break;
 233                         }
 234                         case ID_RESPONDER:
 235                         {
 236                                 idr_payload = (id_payload_t*)payload;
 237                                 break;
 238                         }
 239                         case SECURITY_ASSOCIATION:
 240                         {
 241                                 sa_payload = (sa_payload_t*)payload;
 242                                 break;
 243                         }
 244                         case TRAFFIC_SELECTOR_INITIATOR:
 245                         {
 246                                 tsi_payload = (ts_payload_t*)payload;
 247                                 break;
 248                         }
 249                         case TRAFFIC_SELECTOR_RESPONDER:
 250                         {
 251                                 tsr_payload = (ts_payload_t*)payload;
 252                                 break;
 253                         }
 254                         case NOTIFY:
 255                         {
 256                                 notify_payload_t *notify_payload = (notify_payload_t *) payload;
 257                                 /* handle the notify directly, abort if no further processing required */
 258                                 status = this->process_notify_payload(this, notify_payload);
 259                                 if (status != SUCCESS)
 260                                 {
 261                                         payloads->destroy(payloads);
 262                                         return status;
 263                                 }
 264                         }
 265                         case CERTIFICATE:
 266                         {
 267                                 /* TODO handle cert payloads */
 268                         }
 269                         default:
 270                         {
 271                                 this->logger->log(this->logger, ERROR|LEVEL1, "Ignoring Payload %s (%d)",
 272                                                                         mapping_find(payload_type_m, payload->get_type(payload)), payload->get_type(payload));
 273                                 break;
 274                         }
 275                 }
 276         }
 277         /* iterator can be destroyed */
 278         payloads->destroy(payloads);
 279
 280         /* check if we have all payloads */
 281         if (!(idr_payload && sa_payload && auth_payload && tsi_payload && tsr_payload))
 282         {
 283                 this->logger->log(this->logger, AUDIT, "IKE_AUTH reply did not contain all required payloads. Deleting IKE_SA");
 284                 return DELETE_ME;
 285         }
 286
 287         /* process all payloads */
 288         status = this->process_idr_payload(this, idr_payload);
 289         if (status != SUCCESS)
 290         {
 291                 return status;
 292         }
 293         status = this->process_auth_payload(this, auth_payload,idr_payload);
 294         if (status != SUCCESS)
 295         {
 296                 return status;
 297         }
 298         status = this->process_sa_payload(this, sa_payload);
 299         if (status != SUCCESS)
 300         {
 301                 return status;
 302         }
 303         status = this->process_ts_payload(this, TRUE, tsi_payload);
 304         if (status != SUCCESS)
 305         {
 306                 return status;
 307         }
 308         status = this->process_ts_payload(this, FALSE, tsr_payload);
 309         if (status != SUCCESS)
 310         {
 311                 return status;
 312         }
 313
 314         /* install child SAs for AH and esp */
 315         if (!this->child_sa)
 316         {
 317                 this->logger->log(this->logger, CONTROL, "No CHILD_SA requested, no CHILD_SA built");
 318         }
 319         if (!this->proposal)
 320         {
 321                 this->logger->log(this->logger, CONTROL, "Proposal negotiation failed, no CHILD_SA built");
 322                 this->child_sa->destroy(this->child_sa);
 323                 this->child_sa = NULL;
 324         }
 325         else if (this->my_ts->get_count(this->my_ts) == 0 || this->other_ts->get_count(this->other_ts) == 0)
 326         {
 327                 this->logger->log(this->logger, CONTROL, "Traffic selector negotiation failed, no CHILD_SA built");
 328                 this->child_sa->destroy(this->child_sa);
 329                 this->child_sa = NULL;
 330         }
 331         else
 332         {
 333                 seed = chunk_alloc(this->sent_nonce.len + this->received_nonce.len);
 334                 memcpy(seed.ptr, this->sent_nonce.ptr, this->sent_nonce.len);
 335                 memcpy(seed.ptr + this->sent_nonce.len, this->received_nonce.ptr, this->received_nonce.len);
 336                 prf_plus = prf_plus_create(this->ike_sa->get_child_prf(this->ike_sa), seed);
 337                 chunk_free(&seed);
 338
 339                 status = this->child_sa->update(this->child_sa, this->proposal, prf_plus);
 340                 prf_plus->destroy(prf_plus);
 341                 if (status != SUCCESS)
 342                 {
 343                         this->logger->log(this->logger, AUDIT, "Could not install CHILD_SA! Deleting IKE_SA");
 344                         return DELETE_ME;
 345                 }
 346                 status = this->child_sa->add_policies(this->child_sa, this->my_ts, this->other_ts);
 347                 if (status != SUCCESS)
 348                 {
 349                         this->logger->log(this->logger, AUDIT, "Could not install CHILD_SA policy! Deleting IKE_SA");
 350                         return DELETE_ME;
 351                 }
 352                 this->ike_sa->add_child_sa(this->ike_sa, this->child_sa);
 353         }
 354
 355         this->ike_sa->set_last_replied_message_id(this->ike_sa,ike_auth_reply->get_message_id(ike_auth_reply));
 356
 357         /* create new state */
 358         this->ike_sa->set_new_state(this->ike_sa, (state_t*)ike_sa_established_create(this->ike_sa));
 359         this->destroy_after_state_change(this);
 360
 361         connection = this->ike_sa->get_connection(this->ike_sa);
 362         my_host = connection->get_my_host(connection);
 363         other_host = connection->get_other_host(connection);
 364         this->logger->log(this->logger, AUDIT, "IKE_SA established between %s - %s",
 365                                           my_host->get_address(my_host), other_host->get_address(other_host));
 366
 367         return SUCCESS;
 368 }
 369
 370 /**
 371  * Implements private_ike_auth_requested_t.process_idr_payload
 372  */
 373 static status_t process_idr_payload(private_ike_auth_requested_t *this, id_payload_t *idr_payload)
 374 {
 375         identification_t *other_id, *configured_other_id;
 376         connection_t *connection;
 377
 378         other_id = idr_payload->get_identification(idr_payload);
 379         configured_other_id = this->policy->get_other_id(this->policy);
 380
 381         this->logger->log(this->logger, CONTROL|LEVEL1, "configured ID: %s, ID of responder: %s",
 382                                                 configured_other_id->get_string(configured_other_id),
 383                                                 other_id->get_string(other_id));
 384
 385         if (!other_id->belongs_to(other_id, configured_other_id))
 386         {
 387                 other_id->destroy(other_id);
 388                 this->logger->log(this->logger, AUDIT, "IKE_AUTH reply contained a not acceptable ID. Deleting IKE_SA");
 389                 return DELETE_ME;
 390         }
 391
 392         connection = this->ike_sa->get_connection(this->ike_sa);
 393         connection->update_other_id(connection, other_id->clone(other_id));
 394
 395         this->policy->update_other_id(this->policy, other_id);
 396         return SUCCESS;
 397 }
 398
 399 /**
 400  * Implements private_ike_auth_requested_t.process_sa_payload
 401  */
 402 static status_t process_sa_payload(private_ike_auth_requested_t *this, sa_payload_t *sa_payload)
 403 {
 404         proposal_t *proposal, *proposal_tmp;
 405         linked_list_t *proposal_list;
 406
 407         /* get his selected proposal */
 408         proposal_list = sa_payload->get_proposals(sa_payload);
 409         /* check count of proposals */
 410         if (proposal_list->get_count(proposal_list) == 0)
 411         {
 412                 /* no proposal? we accept this, but no child sa is built */
 413                 this->logger->log(this->logger, AUDIT, "IKE_AUTH reply's SA_PAYLOAD didn't contain any proposals. No CHILD_SA created",
 414                                                   proposal_list->get_count(proposal_list));
 415                 proposal_list->destroy(proposal_list);
 416                 return SUCCESS;
 417         }
 418         if (proposal_list->get_count(proposal_list) > 1)
 419         {
 420                 this->logger->log(this->logger, AUDIT, "IKE_AUTH reply's SA_PAYLOAD contained %d proposal. Deleting IKE_SA",
 421                                                   proposal_list->get_count(proposal_list));
 422                 while (proposal_list->remove_last(proposal_list, (void**)&proposal) == SUCCESS)
 423                 {
 424                         proposal->destroy(proposal);
 425                 }
 426                 proposal_list->destroy(proposal_list);
 427                 return DELETE_ME;
 428         }
 429
 430         /* we have to re-check here if other's selection is valid */
 431         proposal = this->policy->select_proposal(this->policy, proposal_list);
 432         /* list not needed anymore */
 433         while (proposal_list->remove_last(proposal_list, (void**)&proposal_tmp) == SUCCESS)
 434         {
 435                 proposal_tmp->destroy(proposal_tmp);
 436         }
 437         proposal_list->destroy(proposal_list);
 438         /* got a match? */
 439         if (proposal == NULL)
 440         {
 441                 this->logger->log(this->logger, AUDIT, "IKE_AUTH reply contained a not offered proposal. Deleting IKE_SA");
 442                 return DELETE_ME;
 443         }
 444
 445         /* apply proposal */
 446         this->proposal = proposal;
 447
 448         return SUCCESS;
 449 }
 450
 451 /**
 452  * Implements private_ike_auth_requested_t.process_auth_payload
 453  */
 454 static status_t process_auth_payload(private_ike_auth_requested_t *this, auth_payload_t *auth_payload, id_payload_t *other_id_payload)
 455 {
 456         authenticator_t *authenticator;
 457         status_t status;
 458
 459         authenticator = authenticator_create(this->ike_sa);
 460         status = authenticator->verify_auth_data(authenticator,auth_payload,this->ike_sa_init_reply_data,this->sent_nonce,other_id_payload,FALSE);
 461         authenticator->destroy(authenticator);
 462         if (status != SUCCESS)
 463         {
 464                 this->logger->log(this->logger, AUDIT, "Verification of IKE_AUTH reply failed. Deleting IKE_SA");
 465                 return DELETE_ME;
 466         }
 467
 468         this->logger->log(this->logger, CONTROL|LEVEL1, "AUTH data verified successfully");
 469         return SUCCESS;
 470 }
 471
 472 /**
 473  * Implements private_ike_auth_requested_t.process_ts_payload
 474  */
 475 static status_t process_ts_payload(private_ike_auth_requested_t *this, bool ts_initiator, ts_payload_t *ts_payload)
 476 {
 477         linked_list_t *ts_received, *ts_selected;
 478         traffic_selector_t *ts;
 479
 480         /* get ts form payload */
 481         ts_received = ts_payload->get_traffic_selectors(ts_payload);
 482         /* select ts depending on payload type */
 483         if (ts_initiator)
 484         {
 485                 ts_selected = this->policy->select_my_traffic_selectors(this->policy, ts_received);
 486                 this->my_ts = ts_selected;
 487         }
 488         else
 489         {
 490                 ts_selected = this->policy->select_other_traffic_selectors(this->policy, ts_received);
 491                 this->other_ts = ts_selected;
 492         }
 493         /* check if the responder selected valid proposals */
 494         if (ts_selected->get_count(ts_selected) != ts_received->get_count(ts_received))
 495         {
 496                 this->logger->log(this->logger, AUDIT, "IKE_AUTH reply contained not offered traffic selectors.");
 497         }
 498
 499         /* cleanup */
 500         while (ts_received->remove_last(ts_received, (void**)&ts) == SUCCESS)
 501         {
 502                 ts->destroy(ts);
 503         }
 504         ts_received->destroy(ts_received);
 505
 506         return SUCCESS;
 507 }
 508
 509 /**
 510  * Implements private_ike_auth_requested_t.process_notify_payload
 511  */
 512 static status_t process_notify_payload(private_ike_auth_requested_t *this, notify_payload_t *notify_payload)
 513 {
 514         notify_message_type_t notify_message_type = notify_payload->get_notify_message_type(notify_payload);
 515
 516         this->logger->log(this->logger, CONTROL|LEVEL1, "Process notify type %s",
 517                                                           mapping_find(notify_message_type_m, notify_message_type));
 518
 519         switch (notify_message_type)
 520         {
 521                 case INVALID_SYNTAX:
 522                 {
 523                         this->logger->log(this->logger, AUDIT, "IKE_AUTH reply contained an INVALID_SYNTAX notify. Deleting IKE_SA");
 524                         return DELETE_ME;
 525
 526                 }
 527                 case AUTHENTICATION_FAILED:
 528                 {
 529                         this->logger->log(this->logger, AUDIT, "IKE_AUTH reply contained an AUTHENTICATION_FAILED notify. Deleting IKE_SA");
 530                         return DELETE_ME;
 531
 532                 }
 533                 case SINGLE_PAIR_REQUIRED:
 534                 {
 535                         this->logger->log(this->logger, AUDIT, "IKE_AUTH reply contained a SINGLE_PAIR_REQUIRED notify. Deleting IKE_SA");
 536                         return DELETE_ME;
 537                 }
 538                 default:
 539                 {
 540                         /*
 541                          * - In case of unknown error: IKE_SA gets destroyed.
 542                          * - In case of unknown status: logging
 543                          */
 544
 545                         if (notify_message_type < 16383)
 546                         {
 547                                 this->logger->log(this->logger, AUDIT, "IKE_AUTH reply contained an unknown notify error (%d). Deleting IKE_SA",
 548                                                                   notify_message_type);
 549                                 return DELETE_ME;
 550
 551                         }
 552                         else
 553                         {
 554                                 this->logger->log(this->logger, CONTROL, "IKE_AUTH reply contained an unknown notify (%d), ignored.",
 555                                                                         notify_message_type);
 556                                 return SUCCESS;
 557                         }
 558                 }
 559         }
 560 }
 561
 562 /**
 563  * Implements state_t.get_state
 564  */
 565 static ike_sa_state_t get_state(private_ike_auth_requested_t *this)
 566 {
 567         return IKE_AUTH_REQUESTED;
 568 }
 569
 570 /**
 571  * Implements state_t.get_state
 572  */
 573 static void destroy(private_ike_auth_requested_t *this)
 574 {
 575         chunk_free(&(this->received_nonce));
 576         chunk_free(&(this->sent_nonce));
 577         chunk_free(&(this->ike_sa_init_reply_data));
 578         if (this->child_sa)
 579         {
 580                 this->child_sa->destroy(this->child_sa);
 581         }
 582         if (this->my_ts)
 583         {
 584                 traffic_selector_t *ts;
 585                 while (this->my_ts->remove_last(this->my_ts, (void**)&ts) == SUCCESS)
 586                 {
 587                         ts->destroy(ts);
 588                 }
 589                 this->my_ts->destroy(this->my_ts);
 590         }
 591         if (this->other_ts)
 592         {
 593                 traffic_selector_t *ts;
 594                 while (this->other_ts->remove_last(this->other_ts, (void**)&ts) == SUCCESS)
 595                 {
 596                         ts->destroy(ts);
 597                 }
 598                 this->other_ts->destroy(this->other_ts);
 599         }
 600         if (this->proposal)
 601         {
 602                 this->proposal->destroy(this->proposal);
 603         }
 604         free(this);
 605 }
 606 /**
 607  * Implements protected_ike_sa_t.destroy_after_state_change
 608  */
 609 static void destroy_after_state_change(private_ike_auth_requested_t *this)
 610 {
 611         chunk_free(&(this->received_nonce));
 612         chunk_free(&(this->sent_nonce));
 613         chunk_free(&(this->ike_sa_init_reply_data));
 614         if (this->my_ts)
 615         {
 616                 traffic_selector_t *ts;
 617                 while (this->my_ts->remove_last(this->my_ts, (void**)&ts) == SUCCESS)
 618                 {
 619                         ts->destroy(ts);
 620                 }
 621                 this->my_ts->destroy(this->my_ts);
 622         }
 623         if (this->other_ts)
 624         {
 625                 traffic_selector_t *ts;
 626                 while (this->other_ts->remove_last(this->other_ts, (void**)&ts) == SUCCESS)
 627                 {
 628                         ts->destroy(ts);
 629                 }
 630                 this->other_ts->destroy(this->other_ts);
 631         }
 632         if (this->proposal)
 633         {
 634                 this->proposal->destroy(this->proposal);
 635         }
 636         free(this);
 637 }
 638
 639 /*
 640  * Described in header.
 641  */
 642 ike_auth_requested_t *ike_auth_requested_create(protected_ike_sa_t *ike_sa,chunk_t sent_nonce,chunk_t received_nonce,chunk_t ike_sa_init_reply_data, child_sa_t *child_sa)
 643 {
 644         private_ike_auth_requested_t *this = malloc_thing(private_ike_auth_requested_t);
 645
 646         /* interface functions */
 647         this->public.state_interface.process_message = (status_t (*) (state_t *,message_t *)) process_message;
 648         this->public.state_interface.get_state = (ike_sa_state_t (*) (state_t *)) get_state;
 649         this->public.state_interface.destroy  = (void (*) (state_t *)) destroy;
 650
 651         /* private functions */
 652         this->process_idr_payload = process_idr_payload;
 653         this->process_sa_payload = process_sa_payload;
 654         this->process_auth_payload = process_auth_payload;
 655         this->process_ts_payload = process_ts_payload;
 656         this->process_notify_payload = process_notify_payload;
 657         this->destroy_after_state_change = destroy_after_state_change;
 658
 659         /* private data */
 660         this->ike_sa = ike_sa;
 661         this->received_nonce = received_nonce;
 662         this->sent_nonce = sent_nonce;
 663         this->ike_sa_init_reply_data = ike_sa_init_reply_data;
 664         this->logger = logger_manager->get_logger(logger_manager, IKE_SA);
 665         this->my_ts = NULL;
 666         this->other_ts = NULL;
 667         this->proposal = NULL;
 668         this->child_sa = child_sa;
 669
 670         return &(this->public);
 671 }