src/libpts/plugins/imc_attestation/imc_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 "imc_attestation_state.h"
  17 #include "imc_attestation_process.h"
  18
  19 #include <imc/imc_agent.h>
  20 #include <pa_tnc/pa_tnc_msg.h>
  21 #include <ietf/ietf_attr.h>
  22 #include <ietf/ietf_attr_pa_tnc_error.h>
  23 #include <ietf/ietf_attr_product_info.h>
  24
  25 #include <libpts.h>
  26
  27 #include <pts/pts_error.h>
  28
  29 #include <tcg/tcg_pts_attr_proto_caps.h>
  30 #include <tcg/tcg_pts_attr_meas_algo.h>
  31
  32 #include <tncif_pa_subtypes.h>
  33
  34 #include <pen/pen.h>
  35 #include <debug.h>
  36 #include <utils/linked_list.h>
  37
  38 /* IMC definitions */
  39
  40 static const char imc_name[] = "Attestation";
  41
  42 #define IMC_VENDOR_ID                           PEN_TCG
  43 #define IMC_SUBTYPE                                     PA_SUBTYPE_TCG_PTS
  44
  45 static imc_agent_t *imc_attestation;
  46
  47 /**
  48  * Supported PTS measurement algorithms
  49  */
  50 static pts_meas_algorithms_t supported_algorithms = PTS_MEAS_ALGO_NONE;
  51
  52 /**
  53  * Supported PTS Diffie Hellman Groups
  54  */
  55 static pts_dh_group_t supported_dh_groups = PTS_DH_GROUP_NONE;
  56
  57 /**
  58  * see section 3.8.1 of TCG TNC IF-IMC Specification 1.3
  59  */
  60 TNC_Result TNC_IMC_Initialize(TNC_IMCID imc_id,
  61                                                           TNC_Version min_version,
  62                                                           TNC_Version max_version,
  63                                                           TNC_Version *actual_version)
  64 {
  65         if (imc_attestation)
  66         {
  67                 DBG1(DBG_IMC, "IMC \"%s\" has already been initialized", imc_name);
  68                 return TNC_RESULT_ALREADY_INITIALIZED;
  69         }
  70         if (!pts_meas_algo_probe(&supported_algorithms) ||
  71                 !pts_dh_group_probe(&supported_dh_groups))
  72         {
  73                 return TNC_RESULT_FATAL;
  74         }
  75         imc_attestation = imc_agent_create(imc_name, IMC_VENDOR_ID, IMC_SUBTYPE,
  76                                                                            imc_id, actual_version);
  77         if (!imc_attestation)
  78         {
  79                 return TNC_RESULT_FATAL;
  80         }
  81
  82         libpts_init();
  83
  84         if (min_version > TNC_IFIMC_VERSION_1 || max_version < TNC_IFIMC_VERSION_1)
  85         {
  86                 DBG1(DBG_IMC, "no common IF-IMC version");
  87                 return TNC_RESULT_NO_COMMON_VERSION;
  88         }
  89         return TNC_RESULT_SUCCESS;
  90 }
  91
  92 /**
  93  * see section 3.8.2 of TCG TNC IF-IMC Specification 1.3
  94  */
  95 TNC_Result TNC_IMC_NotifyConnectionChange(TNC_IMCID imc_id,
  96                                                                                   TNC_ConnectionID connection_id,
  97                                                                                   TNC_ConnectionState new_state)
  98 {
  99         imc_state_t *state;
 100
 101         if (!imc_attestation)
 102         {
 103                 DBG1(DBG_IMC, "IMC \"%s\" has not been initialized", imc_name);
 104                 return TNC_RESULT_NOT_INITIALIZED;
 105         }
 106         switch (new_state)
 107         {
 108                 case TNC_CONNECTION_STATE_CREATE:
 109                         state = imc_attestation_state_create(connection_id);
 110                         return imc_attestation->create_state(imc_attestation, state);
 111                 case TNC_CONNECTION_STATE_DELETE:
 112                         return imc_attestation->delete_state(imc_attestation, connection_id);
 113                 case TNC_CONNECTION_STATE_HANDSHAKE:
 114                 case TNC_CONNECTION_STATE_ACCESS_ISOLATED:
 115                 case TNC_CONNECTION_STATE_ACCESS_NONE:
 116                 default:
 117                         return imc_attestation->change_state(imc_attestation, connection_id,
 118                                                                                                   new_state, NULL);
 119         }
 120 }
 121
 122
 123 /**
 124  * see section 3.8.3 of TCG TNC IF-IMC Specification 1.3
 125  */
 126 TNC_Result TNC_IMC_BeginHandshake(TNC_IMCID imc_id,
 127                                                                   TNC_ConnectionID connection_id)
 128 {
 129         imc_state_t *state;
 130         imc_attestation_state_t *attestation_state;
 131         pts_t *pts;
 132         char *platform_info;
 133         TNC_Result result = TNC_RESULT_SUCCESS;
 134
 135         if (!imc_attestation)
 136         {
 137                 DBG1(DBG_IMC, "IMC \"%s\" has not been initialized", imc_name);
 138                 return TNC_RESULT_NOT_INITIALIZED;
 139         }
 140
 141         /* get current IMC state */
 142         if (!imc_attestation->get_state(imc_attestation, connection_id, &state))
 143         {
 144                 return TNC_RESULT_FATAL;
 145         }
 146         attestation_state = (imc_attestation_state_t*)state;
 147         pts = attestation_state->get_pts(attestation_state);
 148
 149         platform_info = pts->get_platform_info(pts);
 150         if (platform_info)
 151         {
 152                 pa_tnc_msg_t *pa_tnc_msg;
 153                 pa_tnc_attr_t *attr;
 154
 155                 pa_tnc_msg = pa_tnc_msg_create();
 156                 attr = ietf_attr_product_info_create(0, 0, platform_info);
 157                 pa_tnc_msg->add_attribute(pa_tnc_msg, attr);
 158                 pa_tnc_msg->build(pa_tnc_msg);
 159                 result = imc_attestation->send_message(imc_attestation, connection_id,
 160                                                                                 FALSE, 0, TNC_IMVID_ANY,
 161                                                                                 pa_tnc_msg->get_encoding(pa_tnc_msg));
 162                 pa_tnc_msg->destroy(pa_tnc_msg);
 163         }
 164
 165         return result;
 166 }
 167
 168 static TNC_Result receive_message(TNC_IMCID imc_id,
 169                                                                   TNC_ConnectionID connection_id,
 170                                                                   TNC_UInt32 msg_flags,
 171                                                                   chunk_t msg,
 172                                                                   TNC_VendorID msg_vid,
 173                                                                   TNC_MessageSubtype msg_subtype,
 174                                                                   TNC_UInt32 src_imv_id,
 175                                                                   TNC_UInt32 dst_imc_id)
 176 {
 177         pa_tnc_msg_t *pa_tnc_msg;
 178         pa_tnc_attr_t *attr;
 179         linked_list_t *attr_list;
 180         imc_state_t *state;
 181         imc_attestation_state_t *attestation_state;
 182         enumerator_t *enumerator;
 183         TNC_Result result;
 184
 185         if (!imc_attestation)
 186         {
 187                 DBG1(DBG_IMC, "IMC \"%s\" has not been initialized", imc_name);
 188                 return TNC_RESULT_NOT_INITIALIZED;
 189         }
 190
 191         /* get current IMC state */
 192         if (!imc_attestation->get_state(imc_attestation, connection_id, &state))
 193         {
 194                 return TNC_RESULT_FATAL;
 195         }
 196         attestation_state = (imc_attestation_state_t*)state;
 197
 198         /* parse received PA-TNC message and automatically handle any errors */
 199         result = imc_attestation->receive_message(imc_attestation, state, msg,
 200                                         msg_vid, msg_subtype, src_imv_id, dst_imc_id, &pa_tnc_msg);
 201
 202         /* no parsed PA-TNC attributes available if an error occurred */
 203         if (!pa_tnc_msg)
 204         {
 205                 return result;
 206         }
 207
 208         /* preprocess any IETF standard error attributes */
 209         result = pa_tnc_msg->process_ietf_std_errors(pa_tnc_msg) ?
 210                                         TNC_RESULT_FATAL : TNC_RESULT_SUCCESS;
 211
 212         attr_list = linked_list_create();
 213
 214         /* analyze PA-TNC attributes */
 215         enumerator = pa_tnc_msg->create_attribute_enumerator(pa_tnc_msg);
 216         while (enumerator->enumerate(enumerator, &attr))
 217         {
 218                 if (attr->get_vendor_id(attr) == PEN_IETF &&
 219                         attr->get_type(attr) == IETF_ATTR_PA_TNC_ERROR)
 220                 {
 221                         ietf_attr_pa_tnc_error_t *error_attr;
 222                         pen_t error_vendor_id;
 223                         pa_tnc_error_code_t error_code;
 224                         chunk_t msg_info;
 225
 226                         error_attr = (ietf_attr_pa_tnc_error_t*)attr;
 227                         error_vendor_id = error_attr->get_vendor_id(error_attr);
 228
 229                         if (error_vendor_id == PEN_TCG)
 230                         {
 231                                 error_code = error_attr->get_error_code(error_attr);
 232                                 msg_info = error_attr->get_msg_info(error_attr);
 233
 234                                 DBG1(DBG_IMC, "received TCG-PTS error '%N'",
 235                                          pts_error_code_names, error_code);
 236                                 DBG1(DBG_IMC, "error information: %B", &msg_info);
 237
 238                                 result = TNC_RESULT_FATAL;
 239                         }
 240                 }
 241                 else if (attr->get_vendor_id(attr) == PEN_TCG)
 242                 {
 243                         if (!imc_attestation_process(attr, attr_list, attestation_state,
 244                                 supported_algorithms, supported_dh_groups))
 245                         {
 246                                 result = TNC_RESULT_FATAL;
 247                                 break;
 248                         }
 249                 }
 250         }
 251         enumerator->destroy(enumerator);
 252         pa_tnc_msg->destroy(pa_tnc_msg);
 253
 254         if (result == TNC_RESULT_SUCCESS && attr_list->get_count(attr_list))
 255         {
 256                 pa_tnc_msg = pa_tnc_msg_create();
 257
 258                 enumerator = attr_list->create_enumerator(attr_list);
 259                 while (enumerator->enumerate(enumerator, &attr))
 260                 {
 261                         pa_tnc_msg->add_attribute(pa_tnc_msg, attr);
 262                 }
 263                 enumerator->destroy(enumerator);
 264
 265                 pa_tnc_msg->build(pa_tnc_msg);
 266                 result = imc_attestation->send_message(imc_attestation, connection_id,
 267                                                                                 FALSE, 0, TNC_IMVID_ANY,
 268                                                                                 pa_tnc_msg->get_encoding(pa_tnc_msg));
 269                 pa_tnc_msg->destroy(pa_tnc_msg);
 270         }
 271
 272         attr_list->destroy(attr_list);
 273         return result;
 274 }
 275
 276 /**
 277  * see section 3.8.4 of TCG TNC IF-IMC Specification 1.3
 278  */
 279 TNC_Result TNC_IMC_ReceiveMessage(TNC_IMCID imc_id,
 280                                                                   TNC_ConnectionID connection_id,
 281                                                                   TNC_BufferReference msg,
 282                                                                   TNC_UInt32 msg_len,
 283                                                                   TNC_MessageType msg_type)
 284 {
 285         TNC_VendorID msg_vid;
 286         TNC_MessageSubtype msg_subtype;
 287
 288         msg_vid = msg_type >> 8;
 289         msg_subtype = msg_type & TNC_SUBTYPE_ANY;
 290
 291         return receive_message(imc_id, connection_id, 0, chunk_create(msg, msg_len),
 292                                                    msg_vid,     msg_subtype, 0, TNC_IMCID_ANY);
 293 }
 294
 295 /**
 296  * see section 3.8.6 of TCG TNC IF-IMV Specification 1.3
 297  */
 298 TNC_Result TNC_IMC_ReceiveMessageLong(TNC_IMCID imc_id,
 299                                                                           TNC_ConnectionID connection_id,
 300                                                                           TNC_UInt32 msg_flags,
 301                                                                           TNC_BufferReference msg,
 302                                                                           TNC_UInt32 msg_len,
 303                                                                           TNC_VendorID msg_vid,
 304                                                                           TNC_MessageSubtype msg_subtype,
 305                                                                           TNC_UInt32 src_imv_id,
 306                                                                           TNC_UInt32 dst_imc_id)
 307 {
 308         return receive_message(imc_id, connection_id, msg_flags,
 309                                                    chunk_create(msg, msg_len), msg_vid, msg_subtype,
 310                                                    src_imv_id, dst_imc_id);
 311 }
 312
 313 /**
 314  * see section 3.8.7 of TCG TNC IF-IMC Specification 1.3
 315  */
 316 TNC_Result TNC_IMC_BatchEnding(TNC_IMCID imc_id,
 317                                                            TNC_ConnectionID connection_id)
 318 {
 319         if (!imc_attestation)
 320         {
 321                 DBG1(DBG_IMC, "IMC \"%s\" has not been initialized", imc_name);
 322                 return TNC_RESULT_NOT_INITIALIZED;
 323         }
 324         return TNC_RESULT_SUCCESS;
 325 }
 326
 327 /**
 328  * see section 3.8.8 of TCG TNC IF-IMC Specification 1.3
 329  */
 330 TNC_Result TNC_IMC_Terminate(TNC_IMCID imc_id)
 331 {
 332         if (!imc_attestation)
 333         {
 334                 DBG1(DBG_IMC, "IMC \"%s\" has not been initialized", imc_name);
 335                 return TNC_RESULT_NOT_INITIALIZED;
 336         }
 337
 338         libpts_deinit();
 339
 340         imc_attestation->destroy(imc_attestation);
 341         imc_attestation = NULL;
 342
 343         return TNC_RESULT_SUCCESS;
 344 }
 345
 346 /**
 347  * see section 4.2.8.1 of TCG TNC IF-IMC Specification 1.3
 348  */
 349 TNC_Result TNC_IMC_ProvideBindFunction(TNC_IMCID imc_id,
 350                                                                 TNC_TNCC_BindFunctionPointer bind_function)
 351 {
 352         if (!imc_attestation)
 353         {
 354                 DBG1(DBG_IMC, "IMC \"%s\" has not been initialized", imc_name);
 355                 return TNC_RESULT_NOT_INITIALIZED;
 356         }
 357         return imc_attestation->bind_functions(imc_attestation, bind_function);
 358 }