src/charon/sa/transactions/ike_auth.c

   1 /**
   2  * @file ike_auth.c
   3  *
   4  * @brief Implementation of ike_auth_t transaction.
   5  *
   6  */
   7
   8 /*
   9  * Copyright (C) 2006 Tobias Brunner, Daniel Roethlisberger
  10  * Copyright (C) 2005-2006 Martin Willi
  11  * Copyright (C) 2005 Jan Hutter
  12  * Hochschule fuer Technik Rapperswil
  13  *
  14  * This program is free software; you can redistribute it and/or modify it
  15  * under the terms of the GNU General Public License as published by the
  16  * Free Software Foundation; either version 2 of the License, or (at your
  17  * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
  18  *
  19  * This program is distributed in the hope that it will be useful, but
  20  * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  21  * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  22  * for more details.
  23  */
  24
  25 #include "ike_auth.h"
  26
  27 #include <string.h>
  28
  29 #include <daemon.h>
  30 #include <encoding/payloads/sa_payload.h>
  31 #include <encoding/payloads/id_payload.h>
  32 #include <encoding/payloads/cert_payload.h>
  33 #include <encoding/payloads/certreq_payload.h>
  34 #include <encoding/payloads/auth_payload.h>
  35 #include <encoding/payloads/ts_payload.h>
  36 #include <sa/authenticator.h>
  37 #include <sa/child_sa.h>
  38
  39
  40 typedef struct private_ike_auth_t private_ike_auth_t;
  41
  42 /**
  43  * Private members of a ike_auth_t object..
  44  */
  45 struct private_ike_auth_t {
  46
  47         /**
  48          * Public methods and transaction_t interface.
  49          */
  50         ike_auth_t public;
  51
  52         /**
  53          * Assigned IKE_SA.
  54          */
  55         ike_sa_t *ike_sa;
  56
  57         /**
  58          * Message sent by our peer, if already generated
  59          */
  60         message_t *message;
  61
  62         /**
  63          * Message ID this transaction uses
  64          */
  65         u_int32_t message_id;
  66
  67         /**
  68          * Times we did send the request
  69          */
  70         u_int32_t requested;
  71
  72         /**
  73          * initiator chosen nonce
  74          */
  75         chunk_t nonce_i;
  76
  77         /**
  78          * responder chosen nonce
  79          */
  80         chunk_t nonce_r;
  81
  82         /**
  83          * encoded request message of ike_sa_init transaction
  84          */
  85         chunk_t init_request;
  86
  87         /**
  88          * encoded response message of ike_sa_init transaction
  89          */
  90         chunk_t init_response;
  91
  92         /**
  93          * connection definition used for IKE_SA setup
  94          */
  95         connection_t *connection;
  96
  97         /**
  98          * policy definition used CHILD_SA creation
  99          */
 100         policy_t *policy;
 101
 102         /**
 103          * Negotiated proposal used for CHILD_SA
 104          */
 105         proposal_t *proposal;
 106
 107         /**
 108          * Negotiated traffic selectors for initiator
 109          */
 110         linked_list_t *tsi;
 111
 112         /**
 113          * Negotiated traffic selectors for responder
 114          */
 115         linked_list_t *tsr;
 116
 117         /**
 118          * CHILD_SA created along with IKE_AUTH
 119          */
 120         child_sa_t *child_sa;
 121
 122         /**
 123          * did other peer create a CHILD_SA?
 124          */
 125         bool build_child;
 126
 127         /**
 128          * reqid to use for CHILD_SA setup
 129          */
 130         u_int32_t reqid;
 131 };
 132
 133 /**
 134  * Implementation of transaction_t.get_message_id.
 135  */
 136 static u_int32_t get_message_id(private_ike_auth_t *this)
 137 {
 138         return this->message_id;
 139 }
 140
 141 /**
 142  * Implementation of transaction_t.requested.
 143  */
 144 static u_int32_t requested(private_ike_auth_t *this)
 145 {
 146         return this->requested++;
 147 }
 148
 149 /**
 150  * Implementation of transaction_t.set_config.
 151  */
 152 static void set_config(private_ike_auth_t *this,
 153                                            connection_t *connection, policy_t *policy)
 154 {
 155         this->connection = connection;
 156         this->policy = policy;
 157 }
 158
 159 /**
 160  * Implementation of transaction_t.set_reqid.
 161  */
 162 static void set_reqid(private_ike_auth_t *this, u_int32_t reqid)
 163 {
 164         this->reqid = reqid;
 165 }
 166
 167 /**
 168  * Implementation of transaction_t.set_nonces.
 169  */
 170 static void set_nonces(private_ike_auth_t *this, chunk_t nonce_i, chunk_t nonce_r)
 171 {
 172         this->nonce_i = nonce_i;
 173         this->nonce_r = nonce_r;
 174 }
 175
 176 /**
 177  * Implementation of transaction_t.set_init_messages.
 178  */
 179 static void set_init_messages(private_ike_auth_t *this, chunk_t init_request, chunk_t init_response)
 180 {
 181         this->init_request = init_request;
 182         this->init_response = init_response;
 183 }
 184
 185 /**
 186  * Implementation of transaction_t.get_request.
 187  */
 188 static status_t get_request(private_ike_auth_t *this, message_t **result)
 189 {
 190         message_t *request;
 191         host_t *me, *other;
 192         identification_t *my_id, *other_id;
 193         id_payload_t *my_id_payload;
 194
 195         /* check if we already have built a message (retransmission) */
 196         if (this->message)
 197         {
 198                 *result = this->message;
 199                 return SUCCESS;
 200         }
 201
 202         me = this->ike_sa->get_my_host(this->ike_sa);
 203         other = this->ike_sa->get_other_host(this->ike_sa);
 204         my_id = this->policy->get_my_id(this->policy);
 205         other_id = this->policy->get_other_id(this->policy);
 206
 207         /* build the request */
 208         request = message_create();
 209         request->set_source(request, me->clone(me));
 210         request->set_destination(request, other->clone(other));
 211         request->set_exchange_type(request, IKE_AUTH);
 212         request->set_request(request, TRUE);
 213         request->set_ike_sa_id(request, this->ike_sa->get_id(this->ike_sa));
 214         /* apply for caller */
 215         *result = request;
 216         /* store for retransmission */
 217         this->message = request;
 218
 219         {       /* build ID payload */
 220                 my_id_payload = id_payload_create_from_identification(TRUE, my_id);
 221                 request->add_payload(request, (payload_t*)my_id_payload);
 222         }
 223
 224         /* build certificate request payload */
 225         if (this->connection->get_certreq_policy(this->connection) != CERT_NEVER_SEND)
 226         {
 227                 certreq_payload_t *certreq_payload;
 228                 identification_t *other_ca = this->policy->get_other_ca(this->policy);
 229
 230                 certreq_payload = (other_ca->get_type(other_ca) == ID_ANY)
 231                         ? certreq_payload_create_from_cacerts()
 232                         : certreq_payload_create_from_cacert(other_ca);
 233
 234                 if (certreq_payload != NULL)
 235                 {
 236                         request->add_payload(request, (payload_t*)certreq_payload);
 237                 }
 238         }
 239
 240         /* build certificate payload. TODO: Handle certreq from init_ike_sa. */
 241         if (this->policy->get_auth_method(this->policy) == RSA_DIGITAL_SIGNATURE
 242         &&  this->connection->get_cert_policy(this->connection) != CERT_NEVER_SEND)
 243         {
 244                 cert_payload_t *cert_payload;
 245
 246                 x509_t *cert = charon->credentials->get_certificate(charon->credentials, my_id);
 247
 248                 if (cert)
 249                 {
 250                         cert_payload = cert_payload_create_from_x509(cert);
 251                         request->add_payload(request, (payload_t*)cert_payload);
 252                 }
 253                 else
 254                 {
 255                         DBG1(DBG_IKE, "could not find my certificate, certificate payload omitted");
 256                 }
 257         }
 258
 259         {       /* build IDr payload, if other_id defined */
 260                 id_payload_t *id_payload;
 261                 if (!other_id->contains_wildcards(other_id))
 262                 {
 263                         id_payload = id_payload_create_from_identification(FALSE, other_id);
 264                         request->add_payload(request, (payload_t*)id_payload);
 265                 }
 266         }
 267
 268         {       /* build auth payload */
 269                 authenticator_t *authenticator;
 270                 auth_payload_t *auth_payload;
 271                 auth_method_t auth_method;
 272                 status_t status;
 273
 274                 auth_method = this->policy->get_auth_method(this->policy);
 275                 authenticator = authenticator_create(this->ike_sa, auth_method);
 276                 status = authenticator->compute_auth_data(authenticator,
 277                                                                                                   &auth_payload,
 278                                                                                                   this->init_request,
 279                                                                                                   this->nonce_r,
 280                                                                                                   my_id,
 281                                                                                                   other_id,
 282                                                                                                   TRUE);
 283                 authenticator->destroy(authenticator);
 284                 if (status != SUCCESS)
 285                 {
 286                         SIG(IKE_UP_FAILED, "could not generate AUTH data, deleting IKE_SA");
 287                         SIG(CHILD_UP_FAILED, "initiating CHILD_SA failed, unable to create IKE_SA");
 288                         return DESTROY_ME;
 289                 }
 290                 request->add_payload(request, (payload_t*)auth_payload);
 291         }
 292
 293         {       /* build SA payload for CHILD_SA */
 294                 linked_list_t *proposal_list;
 295                 sa_payload_t *sa_payload;
 296                 u_int32_t soft_lifetime, hard_lifetime;
 297                 bool enable_natt;
 298
 299                 proposal_list = this->policy->get_proposals(this->policy);
 300                 soft_lifetime = this->policy->get_soft_lifetime(this->policy);
 301                 hard_lifetime = this->policy->get_hard_lifetime(this->policy);
 302                 enable_natt = this->ike_sa->is_natt_enabled(this->ike_sa);
 303                 this->child_sa = child_sa_create(this->reqid, me, other, my_id, other_id,
 304                                                                                  soft_lifetime, hard_lifetime,
 305                                                                                  this->policy->get_updown(this->policy),
 306                                                                                  this->policy->get_hostaccess(this->policy),
 307                                                                                  enable_natt);
 308                 this->child_sa->set_name(this->child_sa, this->policy->get_name(this->policy));
 309                 if (this->child_sa->alloc(this->child_sa, proposal_list) != SUCCESS)
 310                 {
 311                         SIG(IKE_UP_FAILED, "could not install CHILD_SA, deleting IKE_SA");
 312                         SIG(CHILD_UP_FAILED, "initiating CHILD_SA failed, unable to create IKE_SA");
 313                         return DESTROY_ME;
 314                 }
 315                 sa_payload = sa_payload_create_from_proposal_list(proposal_list);
 316                 proposal_list->destroy_offset(proposal_list, offsetof(proposal_t, destroy));
 317                 request->add_payload(request, (payload_t*)sa_payload);
 318         }
 319
 320         {       /* build TSi payload */
 321                 linked_list_t *ts_list;
 322                 ts_payload_t *ts_payload;
 323
 324                 ts_list = this->policy->get_my_traffic_selectors(this->policy, me);
 325                 ts_payload = ts_payload_create_from_traffic_selectors(TRUE, ts_list);
 326                 ts_list->destroy_offset(ts_list, offsetof(traffic_selector_t, destroy));
 327
 328                 request->add_payload(request, (payload_t*)ts_payload);
 329         }
 330
 331         {       /* build TSr payload */
 332                 linked_list_t *ts_list;
 333                 ts_payload_t *ts_payload;
 334
 335                 ts_list = this->policy->get_other_traffic_selectors(this->policy, other);
 336                 ts_payload = ts_payload_create_from_traffic_selectors(FALSE, ts_list);
 337                 ts_list->destroy_offset(ts_list, offsetof(traffic_selector_t, destroy));
 338
 339                 request->add_payload(request, (payload_t*)ts_payload);
 340         }
 341
 342         this->message_id = this->ike_sa->get_next_message_id(this->ike_sa);
 343         request->set_message_id(request, this->message_id);
 344         return SUCCESS;
 345 }
 346
 347 /**
 348  * Handle all kind of notifies
 349  */
 350 static status_t process_notifies(private_ike_auth_t *this, notify_payload_t *notify_payload)
 351 {
 352         notify_type_t notify_type = notify_payload->get_notify_type(notify_payload);
 353
 354         DBG2(DBG_IKE, "process notify type %N", notify_type_names, notify_type);
 355
 356         switch (notify_type)
 357         {
 358                 /* these notifies are not critical. no child_sa is built, but IKE stays alive */
 359                 case SINGLE_PAIR_REQUIRED:
 360                 {
 361                         SIG(CHILD_UP_FAILED, "received a SINGLE_PAIR_REQUIRED notify");
 362                         this->build_child = FALSE;
 363                         return SUCCESS;
 364                 }
 365                 case TS_UNACCEPTABLE:
 366                 {
 367                         SIG(CHILD_UP_FAILED, "received TS_UNACCEPTABLE notify");
 368                         this->build_child = FALSE;
 369                         return SUCCESS;
 370                 }
 371                 case NO_PROPOSAL_CHOSEN:
 372                 {
 373                         SIG(CHILD_UP_FAILED, "received NO_PROPOSAL_CHOSEN notify");
 374                         this->build_child = FALSE;
 375                         return SUCCESS;
 376                 }
 377                 default:
 378                 {
 379                         if (notify_type < 16383)
 380                         {
 381                                 SIG(IKE_UP_FAILED, "received %N notify error, deleting IKE_SA",
 382                                         notify_type_names, notify_type);
 383                                 return DESTROY_ME;
 384                         }
 385                         else
 386                         {
 387                                 DBG1(DBG_IKE, "received %N notify, ignored",
 388                                          notify_type_names, notify_type);
 389                                 return SUCCESS;
 390                         }
 391                 }
 392         }
 393 }
 394
 395 /**
 396  * Build a notify message.
 397  */
 398 static void build_notify(notify_type_t type, message_t *message, bool flush_message)
 399 {
 400         notify_payload_t *notify;
 401
 402         if (flush_message)
 403         {
 404                 payload_t *payload;
 405                 iterator_t *iterator = message->get_payload_iterator(message);
 406                 while (iterator->iterate(iterator, (void**)&payload))
 407                 {
 408                         payload->destroy(payload);
 409                         iterator->remove(iterator);
 410                 }
 411                 iterator->destroy(iterator);
 412         }
 413
 414         notify = notify_payload_create();
 415         notify->set_notify_type(notify, type);
 416         message->add_payload(message, (payload_t*)notify);
 417 }
 418
 419 /**
 420  * Import certificate requests from a certreq payload
 421  */
 422 static void import_certificate_request(certreq_payload_t *certreq_payload)
 423 {
 424         chunk_t keyids;
 425         cert_encoding_t encoding = certreq_payload->get_cert_encoding(certreq_payload);
 426
 427         if (encoding != CERT_X509_SIGNATURE)
 428         {
 429                 DBG1(DBG_IKE, "certreq payload %N not supported, ignored",
 430                          cert_encoding_names, encoding);
 431                 return;
 432         }
 433
 434         keyids = certreq_payload->get_data(certreq_payload);
 435
 436         while (keyids.len >= HASH_SIZE_SHA1)
 437         {
 438                 chunk_t keyid = { keyids.ptr, HASH_SIZE_SHA1};
 439                 x509_t *cacert = charon->credentials->get_ca_certificate_by_keyid(charon->credentials, keyid);
 440
 441                 if (cacert)
 442                 {
 443                         DBG1(DBG_IKE, "request for certificate issued by ca '%D'", cacert->get_subject(cacert));
 444                         DBG2(DBG_IKE, "  with keyid %#B", &keyid);
 445                 }
 446                 else
 447                 {
 448                         DBG1(DBG_IKE, "request for certificate issued by unknown ca");
 449                         DBG1(DBG_IKE, "  with keyid %#B", &keyid);
 450                 }
 451                 keyids.ptr += HASH_SIZE_SHA1;
 452                 keyids.len -= HASH_SIZE_SHA1;
 453         }
 454 }
 455
 456 /**
 457  * Import a certificate from a cert payload
 458  */
 459 static void import_certificate(cert_payload_t *cert_payload)
 460 {
 461         bool found;
 462         x509_t *cert;
 463         cert_encoding_t encoding;
 464
 465         encoding = cert_payload->get_cert_encoding(cert_payload);
 466         if (encoding != CERT_X509_SIGNATURE)
 467         {
 468                 DBG1(DBG_IKE, "certificate payload %N not supported, ignored",
 469                          cert_encoding_names, encoding);
 470                 return;
 471         }
 472         cert = x509_create_from_chunk(cert_payload->get_data_clone(cert_payload));
 473         if (cert)
 474         {
 475                 if (charon->credentials->verify(charon->credentials, cert, &found))
 476                 {
 477                         DBG2(DBG_IKE, "received end entity certificate is trusted, added to store");
 478                         if (!found)
 479                         {
 480                                 charon->credentials->add_end_certificate(charon->credentials, cert);
 481                         }
 482                         else
 483                         {
 484                                 cert->destroy(cert);
 485                         }
 486                 }
 487                 else
 488                 {
 489                         DBG1(DBG_IKE, "received end entity certificate is not trusted, discarded");
 490                         cert->destroy(cert);
 491                 }
 492         }
 493         else
 494         {
 495                 DBG1(DBG_IKE, "parsing of received certificate failed, discarded");
 496         }
 497 }
 498
 499 /**
 500  * Install a CHILD_SA for usage
 501  */
 502 static status_t install_child_sa(private_ike_auth_t *this, bool initiator)
 503 {
 504         prf_plus_t *prf_plus;
 505         chunk_t seed;
 506         status_t status;
 507
 508         seed = chunk_alloc(this->nonce_i.len + this->nonce_r.len);
 509         memcpy(seed.ptr, this->nonce_i.ptr, this->nonce_i.len);
 510         memcpy(seed.ptr + this->nonce_i.len, this->nonce_r.ptr, this->nonce_r.len);
 511         prf_plus = prf_plus_create(this->ike_sa->get_child_prf(this->ike_sa), seed);
 512         chunk_free(&seed);
 513
 514         if (initiator)
 515         {
 516                 status = this->child_sa->update(this->child_sa, this->proposal, prf_plus);
 517         }
 518         else
 519         {
 520                 status = this->child_sa->add(this->child_sa, this->proposal, prf_plus);
 521         }
 522         prf_plus->destroy(prf_plus);
 523         if (status != SUCCESS)
 524         {
 525                 return DESTROY_ME;
 526         }
 527         if (initiator)
 528         {
 529                 status = this->child_sa->add_policies(this->child_sa, this->tsi, this->tsr);
 530         }
 531         else
 532         {
 533                 status = this->child_sa->add_policies(this->child_sa, this->tsr, this->tsi);
 534         }
 535         if (status != SUCCESS)
 536         {
 537                 return DESTROY_ME;
 538         }
 539
 540         /* add to IKE_SA, and remove from transaction */
 541         this->child_sa->set_state(this->child_sa, CHILD_INSTALLED);
 542         this->ike_sa->add_child_sa(this->ike_sa, this->child_sa);
 543         this->child_sa = NULL;
 544         return SUCCESS;
 545 }
 546
 547 /**
 548  * Implementation of transaction_t.get_response.
 549  */
 550 static status_t get_response(private_ike_auth_t *this, message_t *request,
 551                                                          message_t **result, transaction_t **next)
 552 {
 553         host_t *me, *other;
 554         identification_t *my_id, *other_id;
 555         message_t *response;
 556         status_t status;
 557         iterator_t *payloads;
 558         payload_t *payload;
 559         id_payload_t *idi_request = NULL;
 560         id_payload_t *idr_request = NULL;
 561         auth_payload_t *auth_request = NULL;
 562         certreq_payload_t *certreq_request = NULL;
 563         cert_payload_t *cert_request = NULL;
 564         sa_payload_t *sa_request = NULL;
 565         ts_payload_t *tsi_request = NULL;
 566         ts_payload_t *tsr_request = NULL;
 567         id_payload_t *idr_response;
 568
 569         /* check if we already have built a response (retransmission) */
 570         if (this->message)
 571         {
 572                 *result = this->message;
 573                 return SUCCESS;
 574         }
 575
 576         SIG(CHILD_UP_START, "setting up CHILD_SA along with IKE_AUTH");
 577
 578         me = this->ike_sa->get_my_host(this->ike_sa);
 579         other = this->ike_sa->get_other_host(this->ike_sa);
 580         this->message_id = request->get_message_id(request);
 581
 582         /* set up response */
 583         response = message_create();
 584         response->set_source(response, me->clone(me));
 585         response->set_destination(response, other->clone(other));
 586         response->set_exchange_type(response, IKE_AUTH);
 587         response->set_request(response, FALSE);
 588         response->set_message_id(response, this->message_id);
 589         response->set_ike_sa_id(response, this->ike_sa->get_id(this->ike_sa));
 590         this->message = response;
 591         *result = response;
 592
 593         /* check message type */
 594         if (request->get_exchange_type(request) != IKE_AUTH)
 595         {
 596                 SIG(IKE_UP_FAILED, "IKE_AUTH response of invalid type, deleting IKE_SA");
 597                 SIG(CHILD_UP_FAILED, "initiating CHILD_SA failed, unable to create IKE_SA");
 598                 return DESTROY_ME;
 599         }
 600
 601         /* Iterate over all payloads. */
 602         payloads = request->get_payload_iterator(request);
 603         while (payloads->iterate(payloads, (void**)&payload))
 604         {
 605                 switch (payload->get_type(payload))
 606                 {
 607                         case ID_INITIATOR:
 608                                 idi_request = (id_payload_t*)payload;
 609                                 break;
 610                         case ID_RESPONDER:
 611                                 idr_request = (id_payload_t*)payload;
 612                                 break;
 613                         case AUTHENTICATION:
 614                                 auth_request = (auth_payload_t*)payload;
 615                                 break;
 616                         case CERTIFICATE_REQUEST:
 617                                 certreq_request = (certreq_payload_t*)payload;
 618                                 break;
 619                         case CERTIFICATE:
 620                                 cert_request = (cert_payload_t*)payload;
 621                                 break;
 622                         case SECURITY_ASSOCIATION:
 623                                 sa_request = (sa_payload_t*)payload;
 624                                 break;
 625                         case TRAFFIC_SELECTOR_INITIATOR:
 626                                 tsi_request = (ts_payload_t*)payload;
 627                                 break;
 628                         case TRAFFIC_SELECTOR_RESPONDER:
 629                                 tsr_request = (ts_payload_t*)payload;
 630                                 break;
 631                         case NOTIFY:
 632                         {
 633                                 status = process_notifies(this, (notify_payload_t*)payload);
 634                                 if (status == FAILED)
 635                                 {
 636                                         payloads->destroy(payloads);
 637                                         /* we return SUCCESS, returned FAILED means do next transaction */
 638                                         return SUCCESS;
 639                                 }
 640                                 if (status == DESTROY_ME)
 641                                 {
 642                                         payloads->destroy(payloads);
 643                                         SIG(CHILD_UP_FAILED, "initiating CHILD_SA failed, unable to create IKE_SA");
 644                                         return DESTROY_ME;
 645                                 }
 646                                 break;
 647                         }
 648                         default:
 649                         {
 650                                 DBG1(DBG_IKE, "ignoring %N payload",
 651                                          payload_type_names, payload->get_type(payload));
 652                                 break;
 653                         }
 654                 }
 655         }
 656         payloads->destroy(payloads);
 657
 658         /* check if we have all payloads */
 659         if (!(idi_request && auth_request && sa_request && tsi_request && tsr_request))
 660         {
 661                 build_notify(INVALID_SYNTAX, response, TRUE);
 662                 SIG(IKE_UP_FAILED, "request message incomplete, deleting IKE_SA");
 663                 SIG(CHILD_UP_FAILED, "initiating CHILD_SA failed, unable to create IKE_SA");
 664                 return DESTROY_ME;
 665         }
 666
 667         {       /* process ID payload */
 668                 other_id = idi_request->get_identification(idi_request);
 669                 if (idr_request)
 670                 {
 671                         my_id = idr_request->get_identification(idr_request);
 672                 }
 673                 else
 674                 {
 675                         my_id = identification_create_from_encoding(ID_ANY, CHUNK_INITIALIZER);
 676                 }
 677         }
 678
 679         {       /* get a policy and process traffic selectors */
 680                 linked_list_t *my_ts, *other_ts;
 681
 682                 my_ts = tsr_request->get_traffic_selectors(tsr_request);
 683                 other_ts = tsi_request->get_traffic_selectors(tsi_request);
 684
 685                 this->policy = charon->policies->get_policy(charon->policies,
 686                                                                                                         my_id, other_id,
 687                                                                                                         my_ts, other_ts,
 688                                                                                                     me, other);
 689                 if (this->policy)
 690                 {
 691                         this->tsr = this->policy->select_my_traffic_selectors(this->policy, my_ts, me);
 692                         this->tsi = this->policy->select_other_traffic_selectors(this->policy, other_ts, other);
 693                 }
 694                 my_ts->destroy_offset(my_ts, offsetof(traffic_selector_t, destroy));
 695                 other_ts->destroy_offset(other_ts, offsetof(traffic_selector_t, destroy));
 696
 697                 /* TODO: We should check somehow if we have a policy, but with other
 698                  * traffic selectors. Then we would create a IKE_SA without a CHILD_SA. */
 699                 if (this->policy == NULL)
 700                 {
 701                         SIG(IKE_UP_FAILED, "no acceptable policy for IDs %D - %D found, "
 702                                 "deleting IKE_SA", my_id, other_id);
 703                         SIG(CHILD_UP_FAILED, "initiating CHILD_SA failed, unable to create IKE_SA");
 704                         my_id->destroy(my_id);
 705                         other_id->destroy(other_id);
 706                         build_notify(AUTHENTICATION_FAILED, response, TRUE);
 707                         return DESTROY_ME;
 708                 }
 709                 my_id->destroy(my_id);
 710
 711                 /* get my id from policy, which must contain a fully qualified valid id */
 712                 my_id = this->policy->get_my_id(this->policy);
 713                 this->ike_sa->set_my_id(this->ike_sa, my_id->clone(my_id));
 714                 this->ike_sa->set_other_id(this->ike_sa, other_id);
 715
 716                 idr_response = id_payload_create_from_identification(FALSE, my_id);
 717                 response->add_payload(response, (payload_t*)idr_response);
 718         }
 719
 720         if (this->policy->get_auth_method(this->policy) == RSA_DIGITAL_SIGNATURE
 721         &&  this->connection->get_cert_policy(this->connection) != CERT_NEVER_SEND)
 722         {       /* build certificate payload */
 723                 x509_t *cert;
 724                 cert_payload_t *cert_payload;
 725
 726                 cert = charon->credentials->get_certificate(charon->credentials, my_id);
 727                 if (cert)
 728                 {
 729                         cert_payload = cert_payload_create_from_x509(cert);
 730                         response->add_payload(response, (payload_t *)cert_payload);
 731                 }
 732                 else
 733                 {
 734                         DBG1(DBG_IKE, "could not find my certificate, cert payload omitted");
 735                 }
 736         }
 737
 738         if (certreq_request)
 739         {       /* process certificate request payload */
 740                 import_certificate_request(certreq_request);
 741         }
 742
 743         if (cert_request)
 744         {       /* process certificate payload */
 745                 import_certificate(cert_request);
 746         }
 747
 748         {       /* process auth payload */
 749                 authenticator_t *authenticator;
 750                 auth_payload_t *auth_response;
 751                 auth_method_t auth_method;
 752                 status_t status;
 753
 754                 auth_method = this->policy->get_auth_method(this->policy);
 755                 authenticator = authenticator_create(this->ike_sa, auth_method);
 756                 status = authenticator->verify_auth_data(authenticator, auth_request,
 757                                                                                                  this->init_request,
 758                                                                                                  this->nonce_r,
 759                                                                                                  my_id,
 760                                                                                                  other_id,
 761                                                                                                  TRUE);
 762                 if (status != SUCCESS)
 763                 {
 764                         SIG(IKE_UP_FAILED, "authentication failed, deleting IKE_SA");
 765                         SIG(CHILD_UP_FAILED, "initiating CHILD_SA failed, unable to create IKE_SA");
 766                         build_notify(AUTHENTICATION_FAILED, response, TRUE);
 767                         authenticator->destroy(authenticator);
 768                         return DESTROY_ME;
 769                 }
 770                 status = authenticator->compute_auth_data(authenticator, &auth_response,
 771                                                                                                   this->init_response,
 772                                                                                                   this->nonce_i,
 773                                                                                                   my_id,
 774                                                                                                   other_id,
 775                                                                                                   FALSE);
 776                 authenticator->destroy(authenticator);
 777                 if (status != SUCCESS)
 778                 {
 779                         SIG(IKE_UP_FAILED, "authentication data generation failed, deleting IKE_SA");
 780                         SIG(CHILD_UP_FAILED, "initiating CHILD_SA failed, unable to create IKE_SA");
 781                         build_notify(AUTHENTICATION_FAILED, response, TRUE);
 782                         return DESTROY_ME;
 783                 }
 784                 response->add_payload(response, (payload_t*)auth_response);
 785         }
 786
 787         SIG(IKE_UP_SUCCESS, "IKE_SA '%s' established between %H[%D]...%H[%D]",
 788                 this->ike_sa->get_name(this->ike_sa), me, my_id, other, other_id);
 789
 790         {       /* process SA payload */
 791                 linked_list_t *proposal_list;
 792                 sa_payload_t *sa_response;
 793                 ts_payload_t *ts_response;
 794                 bool use_natt;
 795                 u_int32_t soft_lifetime, hard_lifetime;
 796
 797                 /* prepare reply */
 798                 sa_response = sa_payload_create();
 799
 800                 /* get proposals from request, and select one with ours */
 801                 proposal_list = sa_request->get_proposals(sa_request);
 802                 DBG2(DBG_IKE, "selecting proposals:");
 803                 this->proposal = this->policy->select_proposal(this->policy, proposal_list);
 804                 proposal_list->destroy_offset(proposal_list, offsetof(proposal_t, destroy));
 805
 806                 /* do we have a proposal? */
 807                 if (this->proposal == NULL)
 808                 {
 809                         SIG(CHILD_UP_FAILED, "CHILD_SA proposals unacceptable, no CHILD_SA created");
 810                         DBG1(DBG_IKE, "adding NO_PROPOSAL_CHOSEN notify to response");
 811                         build_notify(NO_PROPOSAL_CHOSEN, response, FALSE);
 812                 }
 813                 /* do we have traffic selectors? */
 814                 else if (this->tsi->get_count(this->tsi) == 0 || this->tsr->get_count(this->tsr) == 0)
 815                 {
 816                         SIG(CHILD_UP_FAILED, "CHILD_SA traffic selectors unacceptable, no CHILD_SA created");
 817                         DBG1(DBG_IKE, "adding TS_UNACCEPTABLE notify to response");
 818                         build_notify(TS_UNACCEPTABLE, response, FALSE);
 819                 }
 820                 else
 821                 {
 822                         /* create child sa */
 823                         soft_lifetime = this->policy->get_soft_lifetime(this->policy);
 824                         hard_lifetime = this->policy->get_hard_lifetime(this->policy);
 825                         use_natt = this->ike_sa->is_natt_enabled(this->ike_sa);
 826                         this->child_sa = child_sa_create(this->reqid, me, other, my_id, other_id,
 827                                                                                          soft_lifetime, hard_lifetime,
 828                                                                                          this->policy->get_updown(this->policy),
 829                                                                                          this->policy->get_hostaccess(this->policy),
 830                                                                                          use_natt);
 831                         this->child_sa->set_name(this->child_sa, this->policy->get_name(this->policy));
 832                         if (install_child_sa(this, FALSE) != SUCCESS)
 833                         {
 834                                 SIG(CHILD_UP_FAILED, "installing CHILD_SA failed, no CHILD_SA created");
 835                                 DBG1(DBG_IKE, "adding NO_PROPOSAL_CHOSEN notify to response");
 836                                 build_notify(NO_PROPOSAL_CHOSEN, response, FALSE);
 837                         }
 838                         else
 839                         {
 840                                 /* add proposal to sa payload */
 841                                 sa_response->add_proposal(sa_response, this->proposal);
 842                                 SIG(CHILD_UP_SUCCESS, "CHILD_SA created");
 843                         }
 844                 }
 845                 response->add_payload(response, (payload_t*)sa_response);
 846
 847                 /* add ts payload after sa payload */
 848                 ts_response = ts_payload_create_from_traffic_selectors(TRUE, this->tsi);
 849                 response->add_payload(response, (payload_t*)ts_response);
 850                 ts_response = ts_payload_create_from_traffic_selectors(FALSE, this->tsr);
 851                 response->add_payload(response, (payload_t*)ts_response);
 852         }
 853         /* set established state */
 854         this->ike_sa->set_state(this->ike_sa, IKE_ESTABLISHED);
 855         return SUCCESS;
 856 }
 857
 858
 859 /**
 860  * Implementation of transaction_t.conclude
 861  */
 862 static status_t conclude(private_ike_auth_t *this, message_t *response,
 863                                                  transaction_t **transaction)
 864 {
 865         iterator_t *payloads;
 866         payload_t *payload;
 867         host_t *me, *other;
 868         identification_t *other_id, *my_id;
 869         ts_payload_t *tsi_payload = NULL;
 870         ts_payload_t *tsr_payload = NULL;
 871         id_payload_t *idr_payload = NULL;
 872         cert_payload_t *cert_payload = NULL;
 873         auth_payload_t *auth_payload = NULL;
 874         sa_payload_t *sa_payload = NULL;
 875         status_t status;
 876
 877         /* check message type */
 878         if (response->get_exchange_type(response) != IKE_AUTH)
 879         {
 880                 SIG(IKE_UP_FAILED, "IKE_AUTH response of invalid type, deleting IKE_SA");
 881                 SIG(CHILD_UP_FAILED, "initiating CHILD_SA failed, unable to create IKE_SA");
 882                 return DESTROY_ME;
 883         }
 884
 885         me = this->ike_sa->get_my_host(this->ike_sa);
 886         other = this->ike_sa->get_other_host(this->ike_sa);
 887
 888         /* Iterate over all payloads to collect them */
 889         payloads = response->get_payload_iterator(response);
 890         while (payloads->iterate(payloads, (void**)&payload))
 891         {
 892                 switch (payload->get_type(payload))
 893                 {
 894                         case ID_RESPONDER:
 895                                 idr_payload = (id_payload_t*)payload;
 896                                 break;
 897                         case AUTHENTICATION:
 898                                 auth_payload = (auth_payload_t*)payload;
 899                                 break;
 900                         case CERTIFICATE:
 901                                 cert_payload = (cert_payload_t*)payload;
 902                                 break;
 903                         case SECURITY_ASSOCIATION:
 904                                 sa_payload = (sa_payload_t*)payload;
 905                                 break;
 906                         case TRAFFIC_SELECTOR_INITIATOR:
 907                                 tsi_payload = (ts_payload_t*)payload;
 908                                 break;
 909                         case TRAFFIC_SELECTOR_RESPONDER:
 910                                 tsr_payload = (ts_payload_t*)payload;
 911                                 break;
 912                         case NOTIFY:
 913                         {
 914                                 status = process_notifies(this, (notify_payload_t*)payload);
 915                                 if (status == FAILED)
 916                                 {
 917                                         payloads->destroy(payloads);
 918                                         /* we return SUCCESS, as transaction completet */
 919                                         return SUCCESS;
 920                                 }
 921                                 if (status == DESTROY_ME)
 922                                 {
 923                                         SIG(CHILD_UP_FAILED, "initiating CHILD_SA failed, unable to create IKE_SA");
 924                                         payloads->destroy(payloads);
 925                                         return status;
 926                                 }
 927                                 break;
 928                         }
 929                         default:
 930                         {
 931                                 DBG1(DBG_IKE, "ignoring payload %N",
 932                                          payload_type_names, payload->get_type(payload));
 933                                 break;
 934                         }
 935                 }
 936         }
 937         payloads->destroy(payloads);
 938
 939         if (!(idr_payload && auth_payload && sa_payload && tsi_payload && tsr_payload))
 940         {
 941                 SIG(IKE_UP_FAILED, "response message incomplete, deleting IKE_SA");
 942                 SIG(CHILD_UP_FAILED, "initiating CHILD_SA failed, unable to create IKE_SA");
 943                 return DESTROY_ME;
 944         }
 945
 946         {       /* process idr payload */
 947                 identification_t *configured_other_id;
 948                 int wildcards;
 949
 950                 other_id = idr_payload->get_identification(idr_payload);
 951                 configured_other_id = this->policy->get_other_id(this->policy);
 952
 953                 if (!other_id->matches(other_id, configured_other_id, &wildcards))
 954                 {
 955                         other_id->destroy(other_id);
 956                         SIG(IKE_UP_FAILED, "other peer uses unacceptable ID (%D, excepted "
 957                                 "%D), deleting IKE_SA", other_id, configured_other_id);
 958                         SIG(CHILD_UP_FAILED, "initiating CHILD_SA failed, unable to create IKE_SA");
 959                         return DESTROY_ME;
 960                 }
 961                 /* update other ID. It was already set, but may contain wildcards */
 962                 this->ike_sa->set_other_id(this->ike_sa, other_id);
 963         }
 964
 965         if (cert_payload)
 966         {       /* process cert payload */
 967                 import_certificate(cert_payload);
 968         }
 969
 970         {       /* authenticate peer */
 971                 authenticator_t *authenticator;
 972                 auth_method_t auth_method;
 973                 status_t status;
 974
 975                 auth_method = this->policy->get_auth_method(this->policy);
 976                 authenticator = authenticator_create(this->ike_sa, auth_method);
 977                 my_id = this->policy->get_my_id(this->policy);
 978
 979                 status = authenticator->verify_auth_data(authenticator,
 980                                                                                                  auth_payload,
 981                                                                                                  this->init_response,
 982                                                                                                  this->nonce_i,
 983                                                                                                  my_id,
 984                                                                                                  other_id,
 985                                                                                                  FALSE);
 986                 authenticator->destroy(authenticator);
 987                 if (status != SUCCESS)
 988                 {
 989                         SIG(IKE_UP_FAILED, "authentication of '%D' with %N failed, "
 990                                         "deleting IKE_SA", other_id, auth_method_names, auth_method);
 991                         SIG(CHILD_UP_FAILED, "initiating CHILD_SA failed, unable to create IKE_SA");
 992                         return DESTROY_ME;
 993                 }
 994         }
 995
 996         SIG(IKE_UP_SUCCESS, "IKE_SA '%s' established between %H[%D]...%H[%D]",
 997                 this->ike_sa->get_name(this->ike_sa), me, my_id, other, other_id);
 998
 999         {       /* process traffic selectors for us */
1000                 linked_list_t *ts_received = tsi_payload->get_traffic_selectors(tsi_payload);
1001                 this->tsi = this->policy->select_my_traffic_selectors(this->policy, ts_received, me);
1002                 ts_received->destroy_offset(ts_received, offsetof(traffic_selector_t, destroy));
1003         }
1004
1005         {       /* process traffic selectors for other */
1006                 linked_list_t *ts_received = tsr_payload->get_traffic_selectors(tsr_payload);
1007                 this->tsr = this->policy->select_other_traffic_selectors(this->policy, ts_received, other);
1008                 ts_received->destroy_offset(ts_received, offsetof(traffic_selector_t, destroy));
1009         }
1010
1011         {       /* process sa payload */
1012                 linked_list_t *proposal_list;
1013
1014                 proposal_list = sa_payload->get_proposals(sa_payload);
1015                 /* we have to re-check here if other's selection is valid */
1016                 this->proposal = this->policy->select_proposal(this->policy, proposal_list);
1017                 proposal_list->destroy_offset(proposal_list, offsetof(proposal_t, destroy));
1018
1019                 /* everything fine to create CHILD? */
1020                 if (this->proposal == NULL ||
1021                         this->tsi->get_count(this->tsi) == 0 ||
1022                         this->tsr->get_count(this->tsr) == 0 ||
1023                         !this->build_child)
1024                 {
1025                         SIG(CHILD_UP_FAILED, "CHILD_SA negotiation failed, no CHILD_SA built");
1026                 }
1027                 else
1028                 {
1029                         if (install_child_sa(this, TRUE) != SUCCESS)
1030                         {
1031                                 SIG(CHILD_UP_FAILED, "installing CHILD_SA failed, no CHILD_SA built");
1032                                 /* TODO: we should send a DELETE for that CHILD to stay
1033                                  * synchronous with the peer */
1034                         }
1035                         else
1036                         {
1037                                 SIG(CHILD_UP_SUCCESS, "CHILD_SA created");
1038                         }
1039                 }
1040         }
1041         /* set new state */
1042         this->ike_sa->set_state(this->ike_sa, IKE_ESTABLISHED);
1043         return SUCCESS;
1044 }
1045
1046 /**
1047  * implements transaction_t.destroy
1048  */
1049 static void destroy(private_ike_auth_t *this)
1050 {
1051         DESTROY_IF(this->message);
1052         DESTROY_IF(this->proposal);
1053         DESTROY_IF(this->child_sa);
1054         DESTROY_IF(this->policy);
1055         DESTROY_IF(this->connection);
1056         if (this->tsi)
1057         {
1058                 this->tsi->destroy_offset(this->tsi, offsetof(traffic_selector_t, destroy));
1059         }
1060         if (this->tsr)
1061         {
1062                 this->tsr->destroy_offset(this->tsr, offsetof(traffic_selector_t, destroy));
1063         }
1064         chunk_free(&this->nonce_i);
1065         chunk_free(&this->nonce_r);
1066         chunk_free(&this->init_request);
1067         chunk_free(&this->init_response);
1068         free(this);
1069 }
1070
1071 /*
1072  * Described in header.
1073  */
1074 ike_auth_t *ike_auth_create(ike_sa_t *ike_sa)
1075 {
1076         private_ike_auth_t *this = malloc_thing(private_ike_auth_t);
1077
1078         /* transaction interface functions */
1079         this->public.transaction.get_request = (status_t(*)(transaction_t*,message_t**))get_request;
1080         this->public.transaction.get_response = (status_t(*)(transaction_t*,message_t*,message_t**,transaction_t**))get_response;
1081         this->public.transaction.conclude = (status_t(*)(transaction_t*,message_t*,transaction_t**))conclude;
1082         this->public.transaction.get_message_id = (u_int32_t(*)(transaction_t*))get_message_id;
1083         this->public.transaction.requested = (u_int32_t(*)(transaction_t*))requested;
1084         this->public.transaction.destroy = (void(*)(transaction_t*))destroy;
1085
1086         /* public functions */
1087         this->public.set_config = (void(*)(ike_auth_t*,connection_t*,policy_t*))set_config;
1088         this->public.set_reqid = (void(*)(ike_auth_t*,u_int32_t))set_reqid;
1089         this->public.set_nonces = (void(*)(ike_auth_t*,chunk_t,chunk_t))set_nonces;
1090         this->public.set_init_messages = (void(*)(ike_auth_t*,chunk_t,chunk_t))set_init_messages;
1091
1092         /* private data */
1093         this->ike_sa = ike_sa;
1094         this->message_id = 0;
1095         this->message = NULL;
1096         this->requested = 0;
1097         this->nonce_i = CHUNK_INITIALIZER;
1098         this->nonce_r = CHUNK_INITIALIZER;
1099         this->init_request = CHUNK_INITIALIZER;
1100         this->init_response = CHUNK_INITIALIZER;
1101         this->child_sa = NULL;
1102         this->proposal = NULL;
1103         this->tsi = NULL;
1104         this->tsr = NULL;
1105         this->build_child = TRUE;
1106         this->reqid = 0;
1107
1108         return &this->public;
1109 }