src/libimcv/plugins/imv_swid/imv_swid_agent.c

   1 /*
   2  * Copyright (C) 2013-2014 Andreas Steffen
   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 #define _GNU_SOURCE
  17 #include <stdio.h>
  18
  19 #include "imv_swid_agent.h"
  20 #include "imv_swid_state.h"
  21 #include "imv_swid_rest.h"
  22
  23 #include <imcv.h>
  24 #include <imv/imv_agent.h>
  25 #include <imv/imv_msg.h>
  26 #include <ietf/ietf_attr_pa_tnc_error.h>
  27 #include "tcg/seg/tcg_seg_attr_max_size.h"
  28 #include "tcg/seg/tcg_seg_attr_seg_env.h"
  29 #include "tcg/swid/tcg_swid_attr_req.h"
  30 #include "tcg/swid/tcg_swid_attr_tag_inv.h"
  31 #include "tcg/swid/tcg_swid_attr_tag_id_inv.h"
  32 #include "swid/swid_error.h"
  33 #include "swid/swid_inventory.h"
  34
  35 #include <tncif_names.h>
  36 #include <tncif_pa_subtypes.h>
  37
  38 #include <pen/pen.h>
  39 #include <utils/debug.h>
  40 #include <bio/bio_reader.h>
  41
  42 typedef struct private_imv_swid_agent_t private_imv_swid_agent_t;
  43
  44 /* Subscribed PA-TNC message subtypes */
  45 static pen_type_t msg_types[] = {
  46         { PEN_TCG, PA_SUBTYPE_TCG_SWID }
  47 };
  48
  49 /**
  50  * Flag set when corresponding attribute has been received
  51  */
  52 enum imv_swid_attr_t {
  53         IMV_SWID_ATTR_TAG_INV =    (1<<0),
  54         IMV_SWID_ATTR_TAG_ID_INV = (1<<1)
  55 };
  56
  57 /**
  58  * Private data of an imv_swid_agent_t object.
  59  */
  60 struct private_imv_swid_agent_t {
  61
  62         /**
  63          * Public members of imv_swid_agent_t
  64          */
  65         imv_agent_if_t public;
  66
  67         /**
  68          * IMV agent responsible for generic functions
  69          */
  70         imv_agent_t *agent;
  71
  72         /**
  73          * REST API to strongTNC manager
  74          */
  75         imv_swid_rest_t *rest_api;
  76
  77 };
  78
  79 METHOD(imv_agent_if_t, bind_functions, TNC_Result,
  80         private_imv_swid_agent_t *this, TNC_TNCS_BindFunctionPointer bind_function)
  81 {
  82         return this->agent->bind_functions(this->agent, bind_function);
  83 }
  84
  85 METHOD(imv_agent_if_t, notify_connection_change, TNC_Result,
  86         private_imv_swid_agent_t *this, TNC_ConnectionID id,
  87         TNC_ConnectionState new_state)
  88 {
  89         imv_state_t *state;
  90
  91         switch (new_state)
  92         {
  93                 case TNC_CONNECTION_STATE_CREATE:
  94                         state = imv_swid_state_create(id);
  95                         return this->agent->create_state(this->agent, state);
  96                 case TNC_CONNECTION_STATE_DELETE:
  97                         return this->agent->delete_state(this->agent, id);
  98                 default:
  99                         return this->agent->change_state(this->agent, id, new_state, NULL);
 100         }
 101 }
 102
 103 /**
 104  * Process a received message
 105  */
 106 static TNC_Result receive_msg(private_imv_swid_agent_t *this,
 107                                                           imv_state_t *state, imv_msg_t *in_msg)
 108 {
 109         imv_swid_state_t *swid_state;
 110         imv_msg_t *out_msg;
 111         enumerator_t *enumerator;
 112         pa_tnc_attr_t *attr;
 113         TNC_Result result;
 114         bool fatal_error = FALSE;
 115
 116         /* generate an outgoing PA-TNC message - we might need it */
 117         out_msg = imv_msg_create_as_reply(in_msg);
 118
 119         /* parse received PA-TNC message and handle local and remote errors */
 120         result = in_msg->receive(in_msg, out_msg, &fatal_error);
 121         if (result != TNC_RESULT_SUCCESS)
 122         {
 123                 out_msg->destroy(out_msg);
 124                 return result;
 125         }
 126
 127         swid_state = (imv_swid_state_t*)state;
 128
 129         /* analyze PA-TNC attributes */
 130         enumerator = in_msg->create_attribute_enumerator(in_msg);
 131         while (enumerator->enumerate(enumerator, &attr))
 132         {
 133                 uint32_t request_id = 0, last_eid, eid_epoch;
 134                 swid_inventory_t *inventory;
 135                 pen_type_t type;
 136
 137                 type = attr->get_type(attr);
 138
 139                 if (type.vendor_id == PEN_IETF && type.type == IETF_ATTR_PA_TNC_ERROR)
 140                 {
 141                         ietf_attr_pa_tnc_error_t *error_attr;
 142                         pen_type_t error_code;
 143                         chunk_t msg_info, description;
 144                         bio_reader_t *reader;
 145                         uint32_t max_attr_size;
 146                         bool success;
 147
 148                         error_attr = (ietf_attr_pa_tnc_error_t*)attr;
 149                         error_code = error_attr->get_error_code(error_attr);
 150
 151                         if (error_code.vendor_id == PEN_TCG)
 152                         {
 153                                 fatal_error = TRUE;
 154                                 msg_info = error_attr->get_msg_info(error_attr);
 155                                 reader = bio_reader_create(msg_info);
 156                                 success = reader->read_uint32(reader, &request_id);
 157
 158                                 DBG1(DBG_IMV, "received TCG error '%N' for request %d",
 159                                          swid_error_code_names, error_code.type, request_id);
 160                                 if (!success)
 161                                 {
 162                                         reader->destroy(reader);
 163                                         continue;
 164                                 }
 165                                 if (error_code.type == TCG_SWID_RESPONSE_TOO_LARGE)
 166                                 {
 167                                         if (!reader->read_uint32(reader, &max_attr_size))
 168                                         {
 169                                                 reader->destroy(reader);
 170                                                 continue;
 171                                         }
 172                                         DBG1(DBG_IMV, "  maximum PA-TNC attribute size is %u bytes",
 173                                                 max_attr_size);
 174                                 }
 175                                 description = reader->peek(reader);
 176                                 if (description.len)
 177                                 {
 178                                         DBG1(DBG_IMV, "  description: %.*s", description.len,
 179                                                                                                                  description.ptr);
 180                                 }
 181                                 reader->destroy(reader);
 182                         }
 183                 }
 184                 else if (type.vendor_id != PEN_TCG)
 185                 {
 186                         continue;
 187                 }
 188
 189                 switch (type.type)
 190                 {
 191                         case TCG_SWID_TAG_ID_INVENTORY:
 192                         {
 193                                 tcg_swid_attr_tag_id_inv_t *attr_cast;
 194                                 uint32_t missing;
 195                                 int tag_id_count;
 196
 197                                 state->set_action_flags(state, IMV_SWID_ATTR_TAG_ID_INV);
 198
 199                                 attr_cast = (tcg_swid_attr_tag_id_inv_t*)attr;
 200                                 request_id = attr_cast->get_request_id(attr_cast);
 201                                 last_eid = attr_cast->get_last_eid(attr_cast, &eid_epoch);
 202                                 inventory = attr_cast->get_inventory(attr_cast);
 203                                 tag_id_count = inventory->get_count(inventory);
 204                                 missing = attr_cast->get_tag_id_count(attr_cast);
 205                                 swid_state->set_missing(swid_state, missing);
 206
 207                                 DBG2(DBG_IMV, "received SWID tag ID inventory with %d item%s "
 208                                          "for request %d at eid %d of epoch 0x%08x, %d item%s to "
 209                                          "follow", tag_id_count, (tag_id_count == 1) ? "" : "s",
 210                                          request_id, last_eid, eid_epoch, missing,
 211                                          (missing == 1) ? "" : "s");
 212
 213                                 if (request_id == swid_state->get_request_id(swid_state))
 214                                 {
 215                                         swid_state->set_swid_inventory(swid_state, inventory);
 216                                         swid_state->set_count(swid_state, tag_id_count, 0);
 217                                 }
 218                                 else
 219                                 {
 220                                         DBG1(DBG_IMV, "no workitem found for SWID tag ID inventory "
 221                                                                   "with request ID %d", request_id);
 222                                 }
 223                                 attr_cast->clear_inventory(attr_cast);
 224                                 break;
 225                          }
 226                         case TCG_SWID_TAG_INVENTORY:
 227                         {
 228                                 tcg_swid_attr_tag_inv_t *attr_cast;
 229                                 swid_tag_t *tag;
 230                                 chunk_t tag_encoding;
 231                                 json_object *jobj, *jarray, *jstring;
 232                                 char *tag_str;
 233                                 uint32_t missing;
 234                                 int tag_count;
 235                                 enumerator_t *e;
 236
 237                                 state->set_action_flags(state, IMV_SWID_ATTR_TAG_INV);
 238
 239                                 attr_cast = (tcg_swid_attr_tag_inv_t*)attr;
 240                                 request_id = attr_cast->get_request_id(attr_cast);
 241                                 last_eid = attr_cast->get_last_eid(attr_cast, &eid_epoch);
 242                                 inventory = attr_cast->get_inventory(attr_cast);
 243                                 tag_count = inventory->get_count(inventory);
 244                                 missing = attr_cast->get_tag_count(attr_cast);
 245                                 swid_state->set_missing(swid_state, missing);
 246
 247                                 DBG2(DBG_IMV, "received SWID tag inventory with %d item%s for "
 248                                          "request %d at eid %d of epoch 0x%08x, %d item%s to follow",
 249                                          tag_count, (tag_count == 1) ? "" : "s", request_id,
 250                                          last_eid, eid_epoch, missing, (missing == 1) ? "" : "s");
 251
 252                                 if (request_id == swid_state->get_request_id(swid_state))
 253                                 {
 254                                         swid_state->set_count(swid_state, 0, tag_count);
 255
 256                                         if (this->rest_api)
 257                                         {
 258                                                 jobj = json_object_new_object();
 259                                                 jarray = json_object_new_array();
 260                                                 json_object_object_add(jobj, "data", jarray);
 261
 262                                                 e = inventory->create_enumerator(inventory);
 263                                                 while (e->enumerate(e, &tag))
 264                                                 {
 265                                                         tag_encoding = tag->get_encoding(tag);
 266                                                         tag_str = strndup(tag_encoding.ptr, tag_encoding.len);
 267                                                         DBG3(DBG_IMV, "%s", tag_str);
 268                                                         jstring = json_object_new_string(tag_str);
 269                                                         json_object_array_add(jarray, jstring);
 270                                                         free(tag_str);
 271                                                 }
 272                                                 e->destroy(e);
 273
 274                                                 if (this->rest_api->post(this->rest_api,
 275                                                                 "swid/add-tags/", jobj, NULL) != SUCCESS)
 276                                                 {
 277                                                         DBG1(DBG_IMV, "error in REST API add-tags request");
 278                                                 }
 279                                                 json_object_put(jobj);
 280                                         }
 281                                 }
 282                                 else
 283                                 {
 284                                         DBG1(DBG_IMV, "no workitem found for SWID tag inventory "
 285                                                                   "with request ID %d", request_id);
 286                                 }
 287                                 attr_cast->clear_inventory(attr_cast);
 288                                 break;
 289                         }
 290                         default:
 291                                 break;
 292                  }
 293         }
 294         enumerator->destroy(enumerator);
 295
 296         if (fatal_error)
 297         {
 298                 state->set_recommendation(state,
 299                                                                 TNC_IMV_ACTION_RECOMMENDATION_NO_RECOMMENDATION,
 300                                                                 TNC_IMV_EVALUATION_RESULT_ERROR);
 301                 result = out_msg->send_assessment(out_msg);
 302                 if (result == TNC_RESULT_SUCCESS)
 303                 {
 304                         result = this->agent->provide_recommendation(this->agent, state);
 305                 }
 306         }
 307         else
 308         {
 309                 /* send PA-TNC message with the EXCL flag set */
 310                 result = out_msg->send(out_msg, TRUE);
 311         }
 312         out_msg->destroy(out_msg);
 313
 314         return result;
 315 }
 316
 317 METHOD(imv_agent_if_t, receive_message, TNC_Result,
 318         private_imv_swid_agent_t *this, TNC_ConnectionID id,
 319         TNC_MessageType msg_type, chunk_t msg)
 320 {
 321         imv_state_t *state;
 322         imv_msg_t *in_msg;
 323         TNC_Result result;
 324
 325         if (!this->agent->get_state(this->agent, id, &state))
 326         {
 327                 return TNC_RESULT_FATAL;
 328         }
 329         in_msg = imv_msg_create_from_data(this->agent, state, id, msg_type, msg);
 330         result = receive_msg(this, state, in_msg);
 331         in_msg->destroy(in_msg);
 332
 333         return result;
 334 }
 335
 336 METHOD(imv_agent_if_t, receive_message_long, TNC_Result,
 337         private_imv_swid_agent_t *this, TNC_ConnectionID id,
 338         TNC_UInt32 src_imc_id, TNC_UInt32 dst_imv_id,
 339         TNC_VendorID msg_vid, TNC_MessageSubtype msg_subtype, chunk_t msg)
 340 {
 341         imv_state_t *state;
 342         imv_msg_t *in_msg;
 343         TNC_Result result;
 344
 345         if (!this->agent->get_state(this->agent, id, &state))
 346         {
 347                 return TNC_RESULT_FATAL;
 348         }
 349         in_msg = imv_msg_create_from_long_data(this->agent, state, id,
 350                                         src_imc_id, dst_imv_id, msg_vid, msg_subtype, msg);
 351         result = receive_msg(this, state, in_msg);
 352         in_msg->destroy(in_msg);
 353
 354         return result;
 355
 356 }
 357
 358 METHOD(imv_agent_if_t, batch_ending, TNC_Result,
 359         private_imv_swid_agent_t *this, TNC_ConnectionID id)
 360 {
 361         imv_msg_t *out_msg;
 362         imv_state_t *state;
 363         imv_session_t *session;
 364         imv_workitem_t *workitem;
 365         imv_swid_state_t *swid_state;
 366         imv_swid_handshake_state_t handshake_state;
 367         pa_tnc_attr_t *attr;
 368         TNC_IMVID imv_id;
 369         TNC_Result result = TNC_RESULT_SUCCESS;
 370         bool no_workitems = TRUE;
 371         uint32_t request_id, received;
 372         uint8_t flags;
 373         enumerator_t *enumerator;
 374
 375         if (!this->agent->get_state(this->agent, id, &state))
 376         {
 377                 return TNC_RESULT_FATAL;
 378         }
 379         swid_state = (imv_swid_state_t*)state;
 380         handshake_state = swid_state->get_handshake_state(swid_state);
 381         session = state->get_session(state);
 382         imv_id = this->agent->get_id(this->agent);
 383
 384         if (handshake_state == IMV_SWID_STATE_END)
 385         {
 386                 return TNC_RESULT_SUCCESS;
 387         }
 388
 389         /* Create an empty out message - we might need it */
 390         out_msg = imv_msg_create(this->agent, state, id, imv_id, TNC_IMCID_ANY,
 391                                                          msg_types[0]);
 392
 393         if (!imcv_db)
 394         {
 395                 DBG2(DBG_IMV, "no workitems available - no evaluation possible");
 396                 state->set_recommendation(state,
 397                                                         TNC_IMV_ACTION_RECOMMENDATION_ALLOW,
 398                                                         TNC_IMV_EVALUATION_RESULT_DONT_KNOW);
 399                 result = out_msg->send_assessment(out_msg);
 400                 out_msg->destroy(out_msg);
 401                 swid_state->set_handshake_state(swid_state, IMV_SWID_STATE_END);
 402
 403                 if (result != TNC_RESULT_SUCCESS)
 404                 {
 405                         return result;
 406                 }
 407                 return this->agent->provide_recommendation(this->agent, state);
 408         }
 409
 410         /* Look for SWID tag workitem and create SWID tag request */
 411         if (handshake_state == IMV_SWID_STATE_INIT &&
 412                 session->get_policy_started(session))
 413         {
 414                 size_t max_attr_size = SWID_MAX_ATTR_SIZE;
 415                 size_t max_seg_size;
 416                 seg_contract_t *contract;
 417                 seg_contract_manager_t *contracts;
 418                 char buf[BUF_LEN];
 419
 420                 enumerator = session->create_workitem_enumerator(session);
 421                 if (enumerator)
 422                 {
 423                         while (enumerator->enumerate(enumerator, &workitem))
 424                         {
 425                                 if (workitem->get_imv_id(workitem) != TNC_IMVID_ANY ||
 426                                         workitem->get_type(workitem) != IMV_WORKITEM_SWID_TAGS)
 427                                 {
 428                                         continue;
 429                                 }
 430
 431                                 flags = TCG_SWID_ATTR_REQ_FLAG_NONE;
 432                                 if (strchr(workitem->get_arg_str(workitem), 'R'))
 433                                 {
 434                                         flags |= TCG_SWID_ATTR_REQ_FLAG_R;
 435                                 }
 436                                 if (strchr(workitem->get_arg_str(workitem), 'S'))
 437                                 {
 438                                         flags |= TCG_SWID_ATTR_REQ_FLAG_S;
 439                                 }
 440                                 if (strchr(workitem->get_arg_str(workitem), 'C'))
 441                                 {
 442                                         flags |= TCG_SWID_ATTR_REQ_FLAG_C;
 443                                 }
 444
 445                                 /* Determine maximum PA-TNC attribute segment size */
 446                                 max_seg_size = state->get_max_msg_len(state)
 447                                                                 - PA_TNC_HEADER_SIZE
 448                                                                 - PA_TNC_ATTR_HEADER_SIZE
 449                                                                 - TCG_SEG_ATTR_SEG_ENV_HEADER
 450                                                                 - PA_TNC_ATTR_HEADER_SIZE
 451                                                                 - TCG_SEG_ATTR_MAX_SIZE_SIZE;
 452
 453                                 /* Announce support of PA-TNC segmentation to IMC */
 454                                 contract = seg_contract_create(msg_types[0], max_attr_size,
 455                                                                         max_seg_size, TRUE, imv_id, FALSE);
 456                                 contract->get_info_string(contract, buf, BUF_LEN, TRUE);
 457                                 DBG2(DBG_IMV, "%s", buf);
 458                                 contracts = state->get_contracts(state);
 459                                 contracts->add_contract(contracts, contract);
 460                                 attr = tcg_seg_attr_max_size_create(max_attr_size,
 461                                                                                                         max_seg_size, TRUE);
 462                                 out_msg->add_attribute(out_msg, attr);
 463
 464                                 /* Issue a SWID request */
 465                                 request_id = workitem->get_id(workitem);
 466                                 swid_state->set_request_id(swid_state, request_id);
 467                                 attr = tcg_swid_attr_req_create(flags, request_id, 0);
 468                                 out_msg->add_attribute(out_msg, attr);
 469                                 workitem->set_imv_id(workitem, imv_id);
 470                                 no_workitems = FALSE;
 471                                 DBG2(DBG_IMV, "IMV %d issues SWID request %d",
 472                                                            imv_id, request_id);
 473                                 break;
 474                         }
 475                         enumerator->destroy(enumerator);
 476
 477                         if (no_workitems)
 478                         {
 479                                 DBG2(DBG_IMV, "IMV %d has no workitems - "
 480                                                           "no evaluation requested", imv_id);
 481                                 state->set_recommendation(state,
 482                                                                 TNC_IMV_ACTION_RECOMMENDATION_ALLOW,
 483                                                                 TNC_IMV_EVALUATION_RESULT_DONT_KNOW);
 484                         }
 485                         handshake_state = IMV_SWID_STATE_WORKITEMS;
 486                         swid_state->set_handshake_state(swid_state, handshake_state);
 487                 }
 488         }
 489
 490         received = state->get_action_flags(state);
 491
 492         if (handshake_state == IMV_SWID_STATE_WORKITEMS &&
 493            (received & (IMV_SWID_ATTR_TAG_INV|IMV_SWID_ATTR_TAG_ID_INV)) &&
 494                 swid_state->get_missing(swid_state) == 0)
 495         {
 496                 TNC_IMV_Evaluation_Result eval;
 497                 TNC_IMV_Action_Recommendation rec;
 498                 char result_str[BUF_LEN], *error_str = "", *command;
 499                 char *target, *separator;
 500                 int tag_id_count, tag_count, i;
 501                 chunk_t tag_creator, unique_sw_id;
 502                 json_object *jrequest, *jresponse, *jvalue;
 503                 tcg_swid_attr_req_t *cast_attr;
 504                 swid_tag_id_t *tag_id;
 505                 status_t status = SUCCESS;
 506
 507                 if (this->rest_api && (received & IMV_SWID_ATTR_TAG_ID_INV))
 508                 {
 509                         if (asprintf(&command, "sessions/%d/swid-measurement/",
 510                                                  session->get_session_id(session, NULL, NULL)) < 0)
 511                         {
 512                                 error_str = "allocation of command string failed";
 513                                 status = FAILED;
 514                         }
 515                         else
 516                         {
 517                                 jrequest = swid_state->get_swid_inventory(swid_state);
 518                                 status = this->rest_api->post(this->rest_api, command,
 519                                                                                           jrequest, &jresponse);
 520                                 if (status == FAILED)
 521                                 {
 522                                         error_str = "error in REST API swid-measurement request";
 523                                 }
 524                                 free(command);
 525                         }
 526                 }
 527
 528                 switch (status)
 529                 {
 530                         case SUCCESS:
 531                                 enumerator = session->create_workitem_enumerator(session);
 532                                 while (enumerator->enumerate(enumerator, &workitem))
 533                                 {
 534                                         if (workitem->get_type(workitem) == IMV_WORKITEM_SWID_TAGS)
 535                                         {
 536                                                 swid_state->get_count(swid_state, &tag_id_count,
 537                                                                                                                   &tag_count);
 538                                                 snprintf(result_str, BUF_LEN, "received inventory of "
 539                                                                  "%d SWID tag ID%s and %d SWID tag%s",
 540                                                                  tag_id_count, (tag_id_count == 1) ? "" : "s",
 541                                                                  tag_count, (tag_count == 1) ? "" : "s");
 542                                                 session->remove_workitem(session, enumerator);
 543
 544                                                 eval = TNC_IMV_EVALUATION_RESULT_COMPLIANT;
 545                                                 rec = workitem->set_result(workitem, result_str, eval);
 546                                                 state->update_recommendation(state, rec, eval);
 547                                                 imcv_db->finalize_workitem(imcv_db, workitem);
 548                                                 workitem->destroy(workitem);
 549                                                 break;
 550                                         }
 551                                 }
 552                                 enumerator->destroy(enumerator);
 553                                 break;
 554                         case NEED_MORE:
 555                                 if (received & IMV_SWID_ATTR_TAG_INV)
 556                                 {
 557                                         error_str = "not all requested SWID tags were received";
 558                                         status = FAILED;
 559                                         json_object_put(jresponse);
 560                                         break;
 561                                 }
 562                                 if (json_object_get_type(jresponse) != json_type_array)
 563                                 {
 564                                         error_str = "response was not a json_array";
 565                                         status = FAILED;
 566                                         json_object_put(jresponse);
 567                                         break;
 568                                 }
 569
 570                                 /* Create a TCG SWID Request attribute */
 571                                 attr = tcg_swid_attr_req_create(TCG_SWID_ATTR_REQ_FLAG_NONE,
 572                                                                 swid_state->get_request_id(swid_state), 0);
 573                                 tag_id_count = json_object_array_length(jresponse);
 574                                 DBG1(DBG_IMV, "%d SWID tag target%s", tag_id_count,
 575                                                           (tag_id_count == 1) ? "" : "s");
 576                                 swid_state->set_missing(swid_state, tag_id_count);
 577
 578                                 for (i = 0; i < tag_id_count; i++)
 579                                 {
 580                                         jvalue = json_object_array_get_idx(jresponse, i);
 581                                         if (json_object_get_type(jvalue) != json_type_string)
 582                                         {
 583                                                 error_str = "json_string element expected in json_array";
 584                                                 status = FAILED;
 585                                                 json_object_put(jresponse);
 586                                                 break;
 587                                         }
 588                                         target = (char*)json_object_get_string(jvalue);
 589                                         DBG1(DBG_IMV, "  %s", target);
 590
 591                                         /* Separate target into tag_creator and unique_sw_id */
 592                                         separator = strchr(target, '_');
 593                                         if (!separator)
 594                                         {
 595                                                 error_str = "separation of regid from "
 596                                                                         "unique software ID failed";
 597                                                 break;
 598                                         }
 599                                         tag_creator = chunk_create(target, separator - target);
 600                                         separator++;
 601                                         unique_sw_id = chunk_create(separator, strlen(target) -
 602                                                                                                 tag_creator.len - 1);
 603                                         tag_id = swid_tag_id_create(tag_creator, unique_sw_id,
 604                                                                                                 chunk_empty);
 605                                         cast_attr = (tcg_swid_attr_req_t*)attr;
 606                                         cast_attr->add_target(cast_attr, tag_id);
 607                                 }
 608                                 json_object_put(jresponse);
 609
 610                                 out_msg->add_attribute(out_msg, attr);
 611                                 break;
 612                         case FAILED:
 613                         default:
 614                                 break;
 615                 }
 616
 617                 if (status == FAILED)
 618                 {
 619                         enumerator = session->create_workitem_enumerator(session);
 620                         while (enumerator->enumerate(enumerator, &workitem))
 621                         {
 622                                 if (workitem->get_type(workitem) == IMV_WORKITEM_SWID_TAGS)
 623                                 {
 624                                         session->remove_workitem(session, enumerator);
 625                                         eval = TNC_IMV_EVALUATION_RESULT_ERROR;
 626                                         rec = workitem->set_result(workitem, error_str, eval);
 627                                         state->update_recommendation(state, rec, eval);
 628                                         imcv_db->finalize_workitem(imcv_db, workitem);
 629                                         workitem->destroy(workitem);
 630                                         break;
 631                                 }
 632                         }
 633                         enumerator->destroy(enumerator);
 634                 }
 635         }
 636
 637         /* finalized all workitems ? */
 638         if (handshake_state == IMV_SWID_STATE_WORKITEMS &&
 639                 session->get_workitem_count(session, imv_id) == 0)
 640         {
 641                 result = out_msg->send_assessment(out_msg);
 642                 out_msg->destroy(out_msg);
 643                 swid_state->set_handshake_state(swid_state, IMV_SWID_STATE_END);
 644
 645                 if (result != TNC_RESULT_SUCCESS)
 646                 {
 647                         return result;
 648                 }
 649                 return this->agent->provide_recommendation(this->agent, state);
 650         }
 651
 652         /* send non-empty PA-TNC message with excl flag not set */
 653         if (out_msg->get_attribute_count(out_msg))
 654         {
 655                 result = out_msg->send(out_msg, FALSE);
 656         }
 657         out_msg->destroy(out_msg);
 658
 659         return result;
 660 }
 661
 662 METHOD(imv_agent_if_t, solicit_recommendation, TNC_Result,
 663         private_imv_swid_agent_t *this, TNC_ConnectionID id)
 664 {
 665         imv_state_t *state;
 666
 667         if (!this->agent->get_state(this->agent, id, &state))
 668         {
 669                 return TNC_RESULT_FATAL;
 670         }
 671         return this->agent->provide_recommendation(this->agent, state);
 672 }
 673
 674 METHOD(imv_agent_if_t, destroy, void,
 675         private_imv_swid_agent_t *this)
 676 {
 677         DESTROY_IF(this->rest_api);
 678         this->agent->destroy(this->agent);
 679         free(this);
 680 }
 681
 682 /**
 683  * Described in header.
 684  */
 685 imv_agent_if_t *imv_swid_agent_create(const char *name, TNC_IMVID id,
 686                                                                                  TNC_Version *actual_version)
 687 {
 688         private_imv_swid_agent_t *this;
 689         imv_agent_t *agent;
 690         char *rest_api_uri;
 691         u_int rest_api_timeout;
 692
 693         agent = imv_agent_create(name, msg_types, countof(msg_types), id,
 694                                                          actual_version);
 695         if (!agent)
 696         {
 697                 return NULL;
 698         }
 699         agent->add_non_fatal_attr_type(agent,
 700                                 pen_type_create(PEN_TCG, TCG_SEG_MAX_ATTR_SIZE_REQ));
 701
 702         INIT(this,
 703                 .public = {
 704                         .bind_functions = _bind_functions,
 705                         .notify_connection_change = _notify_connection_change,
 706                         .receive_message = _receive_message,
 707                         .receive_message_long = _receive_message_long,
 708                         .batch_ending = _batch_ending,
 709                         .solicit_recommendation = _solicit_recommendation,
 710                         .destroy = _destroy,
 711                 },
 712                 .agent = agent,
 713         );
 714
 715         rest_api_uri = lib->settings->get_str(lib->settings,
 716                                                 "%s.plugins.imv-swid.rest_api_uri", NULL, lib->ns);
 717         rest_api_timeout = lib->settings->get_int(lib->settings,
 718                                                 "%s.plugins.imv-swid.rest_api_timeout", 120, lib->ns);
 719         if (rest_api_uri)
 720         {
 721                 this->rest_api = imv_swid_rest_create(rest_api_uri, rest_api_timeout);
 722         }
 723
 724         return &this->public;
 725 }
 726