src/libimcv/plugins/imv_attestation/imv_attestation.c

   1 /*
   2  * Copyright (C) 2011 Sansar Choinyambuu
   3  * HSR Hochschule fuer Technik Rapperswil
   4  *
   5  * This program is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License as published by the
   7  * Free Software Foundation; either version 2 of the License, or (at your
   8  * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
   9  *
  10  * This program is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  12  * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  13  * for more details.
  14  */
  15
  16 #include "imv_attestation_state.h"
  17
  18 #include <imv/imv_agent.h>
  19 #include <pa_tnc/pa_tnc_msg.h>
  20 #include <ietf/ietf_attr.h>
  21 #include <ietf/ietf_attr_pa_tnc_error.h>
  22 #include <ietf/ietf_attr_product_info.h>
  23
  24 #include <pts/pts_database.h>
  25 #include <pts/pts_creds.h>
  26 #include <pts/pts_error.h>
  27
  28 #include <tcg/tcg_attr.h>
  29 #include <tcg/tcg_pts_attr_proto_caps.h>
  30 #include <tcg/tcg_pts_attr_meas_algo.h>
  31 #include <tcg/tcg_pts_attr_get_tpm_version_info.h>
  32 #include <tcg/tcg_pts_attr_tpm_version_info.h>
  33 #include <tcg/tcg_pts_attr_get_aik.h>
  34 #include <tcg/tcg_pts_attr_aik.h>
  35 #include <tcg/tcg_pts_attr_req_funct_comp_evid.h>
  36 #include <tcg/tcg_pts_attr_gen_attest_evid.h>
  37 #include <tcg/tcg_pts_attr_simple_comp_evid.h>
  38 #include <tcg/tcg_pts_attr_simple_evid_final.h>
  39 #include <tcg/tcg_pts_attr_req_file_meas.h>
  40 #include <tcg/tcg_pts_attr_file_meas.h>
  41
  42 #include <tncif_pa_subtypes.h>
  43
  44 #include <pen/pen.h>
  45 #include <debug.h>
  46 #include <credentials/credential_manager.h>
  47
  48 /* IMV definitions */
  49
  50 static const char imv_name[] = "Attestation";
  51
  52 #define IMV_VENDOR_ID                   PEN_TCG
  53 #define IMV_SUBTYPE                             PA_SUBTYPE_TCG_PTS
  54
  55 static imv_agent_t *imv_attestation;
  56
  57 /**
  58  * Supported PTS measurement algorithms
  59  */
  60 static pts_meas_algorithms_t supported_algorithms = 0;
  61
  62 /**
  63  * PTS file measurement database
  64  */
  65 static pts_database_t *pts_db;
  66
  67 /**
  68  * PTS credentials
  69  */
  70 static pts_creds_t *pts_creds;
  71
  72 /**
  73  * PTS credential manager
  74  */
  75 static credential_manager_t *pts_credmgr;
  76
  77 /**
  78  * see section 3.7.1 of TCG TNC IF-IMV Specification 1.2
  79  */
  80 TNC_Result TNC_IMV_Initialize(TNC_IMVID imv_id,
  81                                                           TNC_Version min_version,
  82                                                           TNC_Version max_version,
  83                                                           TNC_Version *actual_version)
  84 {
  85         char *hash_alg, *uri, *cadir;
  86
  87         if (imv_attestation)
  88         {
  89                 DBG1(DBG_IMV, "IMV \"%s\" has already been initialized", imv_name);
  90                 return TNC_RESULT_ALREADY_INITIALIZED;
  91         }
  92         imv_attestation = imv_agent_create(imv_name, IMV_VENDOR_ID, IMV_SUBTYPE,
  93                                                                 imv_id, actual_version);
  94         if (!imv_attestation || !pts_meas_probe_algorithms(&supported_algorithms))
  95         {
  96                 return TNC_RESULT_FATAL;
  97         }
  98         if (min_version > TNC_IFIMV_VERSION_1 || max_version < TNC_IFIMV_VERSION_1)
  99         {
 100                 DBG1(DBG_IMV, "no common IF-IMV version");
 101                 return TNC_RESULT_NO_COMMON_VERSION;
 102         }
 103
 104         /**
 105          * Specify supported PTS measurement algorithms
 106          *
 107          * sha1 :  PTS_MEAS_ALGO_SHA1
 108          * sha256: PTS_MEAS_ALGO_SHA1 | PTS_MEAS_ALGO_SHA256
 109          * sha384: PTS_MEAS_ALGO_SHA1 | PTS_MEAS_ALGO_SHA256 | PTS_MEAS_ALGO_SHA384
 110          *
 111          * we expect the PTS-IMC to select the strongest supported algorithm
 112          */
 113         hash_alg = lib->settings->get_str(lib->settings,
 114                                 "libimcv.plugins.imv-attestation.hash_algorithm", "sha256");
 115         if (!strcaseeq(hash_alg, "sha384") && !strcaseeq(hash_alg, "sha2_384"))
 116         {
 117                 /* remove SHA384 algorithm */
 118                 supported_algorithms &= ~PTS_MEAS_ALGO_SHA384;
 119         }
 120         if (strcaseeq(hash_alg, "sha1"))
 121         {
 122                 /* remove SHA256 algorithm */
 123                 supported_algorithms &= ~PTS_MEAS_ALGO_SHA256;
 124         }
 125
 126         /* create a PTS credential manager */
 127         pts_credmgr = credential_manager_create();
 128
 129         /* create PTS credential set */
 130         cadir = lib->settings->get_str(lib->settings,
 131                                 "libimcv.plugins.imv-attestation.cadir", NULL);
 132         pts_creds = pts_creds_create(cadir);
 133         if (pts_creds)
 134         {
 135                 pts_credmgr->add_set(pts_credmgr, pts_creds->get_set(pts_creds));
 136         }
 137
 138         /* attach file measurement database */
 139         uri = lib->settings->get_str(lib->settings,
 140                                 "libimcv.plugins.imv-attestation.database", NULL);
 141         pts_db = pts_database_create(uri);
 142
 143         return TNC_RESULT_SUCCESS;
 144 }
 145
 146 /**
 147  * see section 3.7.2 of TCG TNC IF-IMV Specification 1.2
 148  */
 149 TNC_Result TNC_IMV_NotifyConnectionChange(TNC_IMVID imv_id,
 150                                                                                   TNC_ConnectionID connection_id,
 151                                                                                   TNC_ConnectionState new_state)
 152 {
 153         imv_state_t *state;
 154         imv_attestation_state_t *attestation_state;
 155         TNC_Result result;
 156
 157         if (!imv_attestation)
 158         {
 159                 DBG1(DBG_IMV, "IMV \"%s\" has not been initialized", imv_name);
 160                 return TNC_RESULT_NOT_INITIALIZED;
 161         }
 162         switch (new_state)
 163         {
 164                 case TNC_CONNECTION_STATE_CREATE:
 165                         state = imv_attestation_state_create(connection_id);
 166                         return imv_attestation->create_state(imv_attestation, state);
 167                 case TNC_CONNECTION_STATE_DELETE:
 168                         return imv_attestation->delete_state(imv_attestation, connection_id);
 169                 case TNC_CONNECTION_STATE_HANDSHAKE:
 170                         result = imv_attestation->change_state(imv_attestation, connection_id,
 171                                                                                                    new_state, &state);
 172                         if (result != TNC_RESULT_SUCCESS)
 173                         {
 174                                 return result;
 175                         }
 176                         attestation_state = (imv_attestation_state_t*)state;
 177
 178                         /* TODO: Get some configurations */
 179
 180                         return TNC_RESULT_SUCCESS;
 181                 default:
 182                         return imv_attestation->change_state(imv_attestation, connection_id,
 183                                                                                                  new_state, NULL);
 184         }
 185 }
 186
 187 static TNC_Result send_message(TNC_ConnectionID connection_id)
 188 {
 189         pa_tnc_msg_t *msg;
 190         pa_tnc_attr_t *attr;
 191         pts_t *pts;
 192         imv_state_t *state;
 193         imv_attestation_state_t *attestation_state;
 194         imv_attestation_handshake_state_t handshake_state;
 195         TNC_Result result;
 196
 197         if (!imv_attestation->get_state(imv_attestation, connection_id, &state))
 198         {
 199                 return TNC_RESULT_FATAL;
 200         }
 201         attestation_state = (imv_attestation_state_t*)state;
 202         handshake_state = attestation_state->get_handshake_state(attestation_state);
 203         pts = attestation_state->get_pts(attestation_state);
 204
 205         msg = pa_tnc_msg_create();
 206
 207
 208         /* Switch on the attribute type IMV has received */
 209         switch (handshake_state)
 210         {
 211                 case IMV_ATTESTATION_STATE_INIT:
 212                 {
 213                         pts_proto_caps_flag_t flags;
 214
 215                         /* Send Request Protocol Capabilities attribute */
 216                         flags = pts->get_proto_caps(pts);
 217                         attr = tcg_pts_attr_proto_caps_create(flags, TRUE);
 218                         attr->set_noskip_flag(attr, TRUE);
 219                         msg->add_attribute(msg, attr);
 220
 221                         /* Send Measurement Algorithms attribute */
 222                         attr = tcg_pts_attr_meas_algo_create(supported_algorithms, FALSE);
 223                         attr->set_noskip_flag(attr, TRUE);
 224                         msg->add_attribute(msg, attr);
 225
 226                         attestation_state->set_handshake_state(attestation_state,
 227                                                                                 IMV_ATTESTATION_STATE_MEAS);
 228                         break;
 229                 }
 230
 231                 case IMV_ATTESTATION_STATE_MEAS:
 232                 {
 233                         enumerator_t *enumerator;
 234                         u_int32_t delimiter = SOLIDUS_UTF;
 235                         char *platform_info, *pathname;
 236                         int id, type;
 237                         bool is_dir;
 238
 239                         attestation_state->set_handshake_state(attestation_state,
 240                                                                                 IMV_ATTESTATION_STATE_END);
 241
 242                         /* Does the PTS-IMC have TPM support? */
 243                         if (pts->get_proto_caps(pts) & PTS_PROTO_CAPS_T)
 244                         {
 245                                 /* Send Get TPM Version attribute */
 246                                 attr = tcg_pts_attr_get_tpm_version_info_create();
 247                                 attr->set_noskip_flag(attr, TRUE);
 248                                 msg->add_attribute(msg, attr);
 249
 250                                 /* Send Get AIK attribute */
 251                                 attr = tcg_pts_attr_get_aik_create();
 252                                 attr->set_noskip_flag(attr, TRUE);
 253                                 msg->add_attribute(msg, attr);
 254                         }
 255
 256                         /* Get Platform and OS of the PTS-IMC */
 257                         platform_info = pts->get_platform_info(pts);
 258
 259                         if (!pts_db || !platform_info)
 260                         {
 261                                 DBG1(DBG_IMV, "%s%s%s not available",
 262                                         (pts_db) ? "" : "pts database",
 263                                         (!pts_db && !platform_info) ? "and" : "",
 264                                         (platform_info) ? "" : "platform info");
 265                                 break;
 266                         }
 267                         DBG1(DBG_IMV, "platform is '%s'", platform_info);
 268
 269                         /* Send Request File Measurement attribute */
 270                         enumerator = pts_db->create_file_enumerator(pts_db, platform_info);
 271                         if (!enumerator)
 272                         {
 273                                 break;
 274                         }
 275                         while (enumerator->enumerate(enumerator, &id, &type, &pathname))
 276                         {
 277                                 is_dir = (type != 0);
 278                                 DBG2(DBG_IMV, "measurement request %d for %s '%s'",
 279                                          id, is_dir ? "directory" : "file", pathname);
 280                                 attr = tcg_pts_attr_req_file_meas_create(is_dir, id, delimiter,
 281                                                                                                                  pathname);
 282                                 attr->set_noskip_flag(attr, TRUE);
 283                                 msg->add_attribute(msg, attr);
 284                                 attestation_state->add_request(attestation_state, id , is_dir);
 285                         }
 286                         enumerator->destroy(enumerator);
 287                         break;
 288                 }
 289                 case IMV_ATTESTATION_STATE_COMP_EVID:
 290                 case IMV_ATTESTATION_STATE_IML:
 291                         DBG1(DBG_IMV, "Attestation IMV has nothing to send: \"%s\"",
 292                                  handshake_state);
 293                         return TNC_RESULT_FATAL;
 294                 default:
 295                         DBG1(DBG_IMV, "Attestation IMV is in unknown state: \"%s\"",
 296                                  handshake_state);
 297                         return TNC_RESULT_FATAL;
 298         }
 299
 300         msg->build(msg);
 301         result = imv_attestation->send_message(imv_attestation, connection_id,
 302                                                                                    msg->get_encoding(msg));
 303         msg->destroy(msg);
 304
 305         return result;
 306 }
 307
 308 /**
 309  * see section 3.7.3 of TCG TNC IF-IMV Specification 1.2
 310  */
 311 TNC_Result TNC_IMV_ReceiveMessage(TNC_IMVID imv_id,
 312                                                                   TNC_ConnectionID connection_id,
 313                                                                   TNC_BufferReference msg,
 314                                                                   TNC_UInt32 msg_len,
 315                                                                   TNC_MessageType msg_type)
 316 {
 317         pa_tnc_msg_t *pa_tnc_msg;
 318         pa_tnc_attr_t *attr;
 319         imv_state_t *state;
 320         imv_attestation_state_t *attestation_state;
 321         pts_t *pts;
 322         enumerator_t *enumerator;
 323         TNC_Result result;
 324         bool fatal_error = FALSE;
 325         bool measurement_error = FALSE;
 326
 327         if (!imv_attestation)
 328         {
 329                 DBG1(DBG_IMV, "IMV \"%s\" has not been initialized", imv_name);
 330                 return TNC_RESULT_NOT_INITIALIZED;
 331         }
 332
 333         /* get current IMV state */
 334         if (!imv_attestation->get_state(imv_attestation, connection_id, &state))
 335         {
 336                 return TNC_RESULT_FATAL;
 337         }
 338         attestation_state = (imv_attestation_state_t*)state;
 339         pts = attestation_state->get_pts(attestation_state);
 340
 341         /* parse received PA-TNC message and automatically handle any errors */
 342         result = imv_attestation->receive_message(imv_attestation, connection_id,
 343                                                                            chunk_create(msg, msg_len), msg_type,
 344                                                                            &pa_tnc_msg);
 345
 346         /* no parsed PA-TNC attributes available if an error occurred */
 347         if (!pa_tnc_msg)
 348         {
 349                 return result;
 350         }
 351
 352         /* analyze PA-TNC attributes */
 353         enumerator = pa_tnc_msg->create_attribute_enumerator(pa_tnc_msg);
 354         while (enumerator->enumerate(enumerator, &attr))
 355         {
 356                 if (attr->get_vendor_id(attr) == PEN_IETF)
 357                 {
 358                         if (attr->get_type(attr) == IETF_ATTR_PA_TNC_ERROR)
 359                         {
 360                                 ietf_attr_pa_tnc_error_t *error_attr;
 361                                 pen_t error_vendor_id;
 362                                 pa_tnc_error_code_t error_code;
 363                                 chunk_t msg_info, attr_info;
 364                                 u_int32_t offset;
 365
 366                                 error_attr = (ietf_attr_pa_tnc_error_t*)attr;
 367                                 error_vendor_id = error_attr->get_vendor_id(error_attr);
 368                                 error_code = error_attr->get_error_code(error_attr);
 369                                 msg_info = error_attr->get_msg_info(error_attr);
 370
 371                                 if (error_vendor_id == PEN_IETF)
 372                                 {
 373                                         DBG1(DBG_IMV, "received PA-TNC error '%N' "
 374                                                                   "concerning message %#B",
 375                                                  pa_tnc_error_code_names, error_code, &msg_info);
 376
 377                                         switch (error_code)
 378                                         {
 379                                                 case PA_ERROR_INVALID_PARAMETER:
 380                                                         offset = error_attr->get_offset(error_attr);
 381                                                         DBG1(DBG_IMV, "  occurred at offset of %u bytes",
 382                                                                  offset);
 383                                                         break;
 384                                                 case PA_ERROR_ATTR_TYPE_NOT_SUPPORTED:
 385                                                         attr_info = error_attr->get_attr_info(error_attr);
 386                                                         DBG1(DBG_IMV, "  unsupported attribute %#B",
 387                                                                  &attr_info);
 388                                                         break;
 389                                                 default:
 390                                                         break;
 391                                         }
 392                                 }
 393                                 else if (error_vendor_id == PEN_TCG)
 394                                 {
 395                                         DBG1(DBG_IMV, "received TCG-PTS error '%N'",
 396                                                  pts_error_code_names, error_code);
 397                                         DBG1(DBG_IMV, "error information: %B", &msg_info);
 398                                 }
 399                                 fatal_error = TRUE;
 400                         }
 401                         else if (attr->get_type(attr) == IETF_ATTR_PRODUCT_INFORMATION)
 402                         {
 403                                 ietf_attr_product_info_t *attr_cast;
 404                                 char *platform_info;
 405
 406                                 attr_cast = (ietf_attr_product_info_t*)attr;
 407                                 platform_info = attr_cast->get_info(attr_cast, NULL, NULL);
 408                                 pts->set_platform_info(pts, platform_info);
 409                         }
 410                 }
 411                 else if (attr->get_vendor_id(attr) == PEN_TCG)
 412                 {
 413                         switch (attr->get_type(attr))
 414                         {
 415                                 case TCG_PTS_PROTO_CAPS:
 416                                 {
 417                                         tcg_pts_attr_proto_caps_t *attr_cast;
 418                                         pts_proto_caps_flag_t flags;
 419
 420                                         attr_cast = (tcg_pts_attr_proto_caps_t*)attr;
 421                                         flags = attr_cast->get_flags(attr_cast);
 422                                         pts->set_proto_caps(pts, flags);
 423                                         break;
 424                                 }
 425                                 case TCG_PTS_MEAS_ALGO_SELECTION:
 426                                 {
 427                                         tcg_pts_attr_meas_algo_t *attr_cast;
 428                                         pts_meas_algorithms_t selected_algorithm;
 429
 430                                         attr_cast = (tcg_pts_attr_meas_algo_t*)attr;
 431                                         selected_algorithm = attr_cast->get_algorithms(attr_cast);
 432                                         pts->set_meas_algorithm(pts, selected_algorithm);
 433                                         break;
 434                                 }
 435                                 case TCG_PTS_TPM_VERSION_INFO:
 436                                 {
 437                                         tcg_pts_attr_tpm_version_info_t *attr_cast;
 438                                         chunk_t tpm_version_info;
 439
 440                                         attr_cast = (tcg_pts_attr_tpm_version_info_t*)attr;
 441                                         tpm_version_info = attr_cast->get_tpm_version_info(attr_cast);
 442                                         pts->set_tpm_version_info(pts, tpm_version_info);
 443                                         break;
 444                                 }
 445                                 case TCG_PTS_AIK:
 446                                 {
 447                                         tcg_pts_attr_aik_t *attr_cast;
 448                                         certificate_t *aik, *issuer;
 449                                         enumerator_t *e;
 450                                         bool trusted = FALSE;
 451
 452                                         attr_cast = (tcg_pts_attr_aik_t*)attr;
 453                                         aik = attr_cast->get_aik(attr_cast);
 454                                         if (!aik)
 455                                         {
 456                                                 /* TODO generate error attribute */
 457                                                 break;
 458                                         }
 459                                         if (aik->get_type(aik) == CERT_X509)
 460                                         {
 461                                                 DBG1(DBG_IMV, "verifying AIK certificate");
 462                                                 e = pts_credmgr->create_trusted_enumerator(pts_credmgr,
 463                                                                         KEY_ANY, aik->get_issuer(aik), FALSE);
 464                                                 while (e->enumerate(e, &issuer))
 465                                                 {
 466                                                         if (aik->issued_by(aik, issuer))
 467                                                         {
 468                                                                 trusted = TRUE;
 469                                                                 break;
 470                                                         }
 471                                                 }
 472                                                 e->destroy(e);
 473                                                 DBG1(DBG_IMV, "AIK certificate is %strusted",
 474                                                                            trusted ? "" : "not ");
 475                                         }
 476                                         pts->set_aik(pts, aik);
 477                                         break;
 478                                 }
 479
 480                                 /* PTS-based Attestation Evidence */
 481                                 case TCG_PTS_SIMPLE_COMP_EVID:
 482                                         break;
 483                                 case TCG_PTS_SIMPLE_EVID_FINAL:
 484                                         break;
 485                                 case TCG_PTS_FILE_MEAS:
 486                                 {
 487                                         tcg_pts_attr_file_meas_t *attr_cast;
 488                                         u_int16_t request_id;
 489                                         int file_count;
 490                                         pts_meas_algorithms_t algo;
 491                                         pts_file_meas_t *measurements;
 492                                         char *platform_info;
 493                                         enumerator_t *e_hash;
 494                                         bool is_dir;
 495
 496                                         platform_info = pts->get_platform_info(pts);
 497                                         if (!pts_db || !platform_info)
 498                                         {
 499                                                 break;
 500                                         }
 501
 502                                         attr_cast = (tcg_pts_attr_file_meas_t*)attr;
 503                                         measurements = attr_cast->get_measurements(attr_cast);
 504                                         algo = pts->get_meas_algorithm(pts);
 505                                         request_id = measurements->get_request_id(measurements);
 506                                         file_count = measurements->get_file_count(measurements);
 507
 508                                         DBG1(DBG_IMV, "measurement request %d returned %d file%s:",
 509                                                  request_id, file_count, (file_count == 1) ? "":"s");
 510
 511                                         if (!attestation_state->check_off_request(attestation_state,
 512                                                 request_id, &is_dir))
 513                                         {
 514                                                 DBG1(DBG_IMV, "  no entry found for this request");
 515                                                 break;
 516                                         }
 517
 518                                         /* check hashes from database against measurements */
 519                                         e_hash = pts_db->create_hash_enumerator(pts_db,
 520                                                                         platform_info, algo, request_id, is_dir);
 521                                         if (!measurements->verify(measurements, e_hash, is_dir))
 522                                         {
 523                                                 measurement_error = TRUE;
 524                                         }
 525                                         e_hash->destroy(e_hash);
 526                                         break;
 527                                 }
 528
 529                                 /* TODO: Not implemented yet */
 530                                 case TCG_PTS_DH_NONCE_PARAMS_RESP:
 531                                 case TCG_PTS_UNIX_FILE_META:
 532                                 case TCG_PTS_INTEG_MEAS_LOG:
 533                                 /* Attributes using XML */
 534                                 case TCG_PTS_TEMPL_REF_MANI_SET_META:
 535                                 case TCG_PTS_VERIFICATION_RESULT:
 536                                 case TCG_PTS_INTEG_REPORT:
 537                                 /* On Windows only*/
 538                                 case TCG_PTS_WIN_FILE_META:
 539                                 case TCG_PTS_REGISTRY_VALUE:
 540                                 /* Received on IMC side only*/
 541                                 case TCG_PTS_REQ_PROTO_CAPS:
 542                                 case TCG_PTS_DH_NONCE_PARAMS_REQ:
 543                                 case TCG_PTS_DH_NONCE_FINISH:
 544                                 case TCG_PTS_MEAS_ALGO:
 545                                 case TCG_PTS_GET_TPM_VERSION_INFO:
 546                                 case TCG_PTS_REQ_TEMPL_REF_MANI_SET_META:
 547                                 case TCG_PTS_UPDATE_TEMPL_REF_MANI:
 548                                 case TCG_PTS_GET_AIK:
 549                                 case TCG_PTS_REQ_FUNCT_COMP_EVID:
 550                                 case TCG_PTS_GEN_ATTEST_EVID:
 551                                 case TCG_PTS_REQ_FILE_META:
 552                                 case TCG_PTS_REQ_FILE_MEAS:
 553                                 case TCG_PTS_REQ_INTEG_MEAS_LOG:
 554                                 default:
 555                                         DBG1(DBG_IMV, "received unsupported attribute '%N'",
 556                                                 tcg_attr_names, attr->get_type(attr));
 557                                         break;
 558                         }
 559                 }
 560         }
 561         enumerator->destroy(enumerator);
 562         pa_tnc_msg->destroy(pa_tnc_msg);
 563
 564
 565         if (fatal_error)
 566         {
 567                 state->set_recommendation(state,
 568                                                                 TNC_IMV_ACTION_RECOMMENDATION_NO_RECOMMENDATION,
 569                                                                 TNC_IMV_EVALUATION_RESULT_ERROR);
 570                 return imv_attestation->provide_recommendation(imv_attestation,
 571                                                                                                            connection_id);
 572         }
 573
 574         if (attestation_state->get_handshake_state(attestation_state) &
 575                 IMV_ATTESTATION_STATE_END)
 576         {
 577                 if (attestation_state->get_request_count(attestation_state))
 578                 {
 579                         DBG1(DBG_IMV, "failure due to %d pending file measurements",
 580                                  attestation_state->get_request_count(attestation_state));
 581                         measurement_error = TRUE;
 582                 }
 583                 if (measurement_error)
 584                 {
 585                         state->set_recommendation(state,
 586                                                                 TNC_IMV_ACTION_RECOMMENDATION_ISOLATE,
 587                                                                 TNC_IMV_EVALUATION_RESULT_NONCOMPLIANT_MAJOR);
 588                 }
 589                 else
 590                 {
 591                         state->set_recommendation(state,
 592                                                                 TNC_IMV_ACTION_RECOMMENDATION_ALLOW,
 593                                                                 TNC_IMV_EVALUATION_RESULT_COMPLIANT);
 594                 }
 595                 return imv_attestation->provide_recommendation(imv_attestation,
 596                                                                                                            connection_id);
 597         }
 598
 599         return send_message(connection_id);
 600 }
 601
 602 /**
 603  * see section 3.7.4 of TCG TNC IF-IMV Specification 1.2
 604  */
 605 TNC_Result TNC_IMV_SolicitRecommendation(TNC_IMVID imv_id,
 606                                                                                  TNC_ConnectionID connection_id)
 607 {
 608         if (!imv_attestation)
 609         {
 610                 DBG1(DBG_IMV, "IMV \"%s\" has not been initialized", imv_name);
 611                 return TNC_RESULT_NOT_INITIALIZED;
 612         }
 613         return imv_attestation->provide_recommendation(imv_attestation, connection_id);
 614 }
 615
 616 /**
 617  * see section 3.7.5 of TCG TNC IF-IMV Specification 1.2
 618  */
 619 TNC_Result TNC_IMV_BatchEnding(TNC_IMVID imv_id,
 620                                                            TNC_ConnectionID connection_id)
 621 {
 622         imv_state_t *state;
 623         imv_attestation_state_t *attestation_state;
 624
 625         if (!imv_attestation)
 626         {
 627                 DBG1(DBG_IMV, "IMV \"%s\" has not been initialized", imv_name);
 628                 return TNC_RESULT_NOT_INITIALIZED;
 629         }
 630         /* get current IMV state */
 631         if (!imv_attestation->get_state(imv_attestation, connection_id, &state))
 632         {
 633                 return TNC_RESULT_FATAL;
 634         }
 635         attestation_state = (imv_attestation_state_t*)state;
 636
 637         /* Check if IMV has to initiate the PA-TNC exchange */
 638         if (attestation_state->get_handshake_state(attestation_state) ==
 639                 IMV_ATTESTATION_STATE_INIT)
 640         {
 641                 return send_message(connection_id);
 642         }
 643         return TNC_RESULT_SUCCESS;
 644 }
 645
 646 /**
 647  * see section 3.7.6 of TCG TNC IF-IMV Specification 1.2
 648  */
 649 TNC_Result TNC_IMV_Terminate(TNC_IMVID imv_id)
 650 {
 651         if (!imv_attestation)
 652         {
 653                 DBG1(DBG_IMV, "IMV \"%s\" has not been initialized", imv_name);
 654                 return TNC_RESULT_NOT_INITIALIZED;
 655         }
 656         if (pts_creds)
 657         {
 658                 pts_credmgr->remove_set(pts_credmgr, pts_creds->get_set(pts_creds));
 659                 pts_creds->destroy(pts_creds);
 660         }
 661         DESTROY_IF(pts_db);
 662         DESTROY_IF(pts_credmgr);
 663         imv_attestation->destroy(imv_attestation);
 664         imv_attestation = NULL;
 665
 666         return TNC_RESULT_SUCCESS;
 667 }
 668
 669 /**
 670  * see section 4.2.8.1 of TCG TNC IF-IMV Specification 1.2
 671  */
 672 TNC_Result TNC_IMV_ProvideBindFunction(TNC_IMVID imv_id,
 673                                                                            TNC_TNCS_BindFunctionPointer bind_function)
 674 {
 675         if (!imv_attestation)
 676         {
 677                 DBG1(DBG_IMV, "IMV \"%s\" has not been initialized", imv_name);
 678                 return TNC_RESULT_NOT_INITIALIZED;
 679         }
 680         return imv_attestation->bind_functions(imv_attestation, bind_function);
 681 }