src/libpts/plugins/imc_attestation/imc_attestation.c

   1 /*
   2  * Copyright (C) 2011-2012 Sansar Choinyambuu, 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 #include "imc_attestation_state.h"
  17 #include "imc_attestation_process.h"
  18
  19 #include <imc/imc_agent.h>
  20 #include <imc/imc_msg.h>
  21 #include <pa_tnc/pa_tnc_msg.h>
  22 #include <ietf/ietf_attr.h>
  23 #include <ietf/ietf_attr_pa_tnc_error.h>
  24 #include <ietf/ietf_attr_product_info.h>
  25 #include <ietf/ietf_attr_string_version.h>
  26 #include <ietf/ietf_attr_assess_result.h>
  27 #include <os_info/os_info.h>
  28
  29 #include <libpts.h>
  30
  31 #include <pts/pts_error.h>
  32
  33 #include <tcg/tcg_pts_attr_proto_caps.h>
  34 #include <tcg/tcg_pts_attr_meas_algo.h>
  35
  36 #include <tncif_pa_subtypes.h>
  37
  38 #include <pen/pen.h>
  39 #include <debug.h>
  40 #include <utils/linked_list.h>
  41
  42 /* IMC definitions */
  43
  44 static const char imc_name[] = "Attestation";
  45
  46 static pen_type_t msg_types[] = {
  47         { PEN_TCG, PA_SUBTYPE_TCG_PTS }
  48 };
  49
  50 static imc_agent_t *imc_attestation;
  51
  52 /**
  53  * Supported PTS measurement algorithms
  54  */
  55 static pts_meas_algorithms_t supported_algorithms = PTS_MEAS_ALGO_NONE;
  56
  57 /**
  58  * Supported PTS Diffie Hellman Groups
  59  */
  60 static pts_dh_group_t supported_dh_groups = PTS_DH_GROUP_NONE;
  61
  62 /**
  63  * see section 3.8.1 of TCG TNC IF-IMC Specification 1.3
  64  */
  65 TNC_Result TNC_IMC_Initialize(TNC_IMCID imc_id,
  66                                                           TNC_Version min_version,
  67                                                           TNC_Version max_version,
  68                                                           TNC_Version *actual_version)
  69 {
  70         if (imc_attestation)
  71         {
  72                 DBG1(DBG_IMC, "IMC \"%s\" has already been initialized", imc_name);
  73                 return TNC_RESULT_ALREADY_INITIALIZED;
  74         }
  75         if (!pts_meas_algo_probe(&supported_algorithms) ||
  76                 !pts_dh_group_probe(&supported_dh_groups))
  77         {
  78                 return TNC_RESULT_FATAL;
  79         }
  80         imc_attestation = imc_agent_create(imc_name, msg_types, 1, imc_id,
  81                                                                            actual_version);
  82         if (!imc_attestation)
  83         {
  84                 return TNC_RESULT_FATAL;
  85         }
  86
  87         libpts_init();
  88
  89         if (min_version > TNC_IFIMC_VERSION_1 || max_version < TNC_IFIMC_VERSION_1)
  90         {
  91                 DBG1(DBG_IMC, "no common IF-IMC version");
  92                 return TNC_RESULT_NO_COMMON_VERSION;
  93         }
  94         return TNC_RESULT_SUCCESS;
  95 }
  96
  97 /**
  98  * see section 3.8.2 of TCG TNC IF-IMC Specification 1.3
  99  */
 100 TNC_Result TNC_IMC_NotifyConnectionChange(TNC_IMCID imc_id,
 101                                                                                   TNC_ConnectionID connection_id,
 102                                                                                   TNC_ConnectionState new_state)
 103 {
 104         imc_state_t *state;
 105
 106         if (!imc_attestation)
 107         {
 108                 DBG1(DBG_IMC, "IMC \"%s\" has not been initialized", imc_name);
 109                 return TNC_RESULT_NOT_INITIALIZED;
 110         }
 111         switch (new_state)
 112         {
 113                 case TNC_CONNECTION_STATE_CREATE:
 114                         state = imc_attestation_state_create(connection_id);
 115                         return imc_attestation->create_state(imc_attestation, state);
 116                 case TNC_CONNECTION_STATE_HANDSHAKE:
 117                         if (imc_attestation->change_state(imc_attestation, connection_id,
 118                                 new_state, &state) != TNC_RESULT_SUCCESS)
 119                         {
 120                                 return TNC_RESULT_FATAL;
 121                         }
 122                         state->set_result(state, imc_id,
 123                                                           TNC_IMV_EVALUATION_RESULT_DONT_KNOW);
 124                         return TNC_RESULT_SUCCESS;
 125                 case TNC_CONNECTION_STATE_DELETE:
 126                         return imc_attestation->delete_state(imc_attestation, connection_id);
 127                 case TNC_CONNECTION_STATE_ACCESS_ISOLATED:
 128                 case TNC_CONNECTION_STATE_ACCESS_NONE:
 129                 default:
 130                         return imc_attestation->change_state(imc_attestation, connection_id,
 131                                                                                                   new_state, NULL);
 132         }
 133 }
 134
 135
 136 /**
 137  * see section 3.8.3 of TCG TNC IF-IMC Specification 1.3
 138  */
 139 TNC_Result TNC_IMC_BeginHandshake(TNC_IMCID imc_id,
 140                                                                   TNC_ConnectionID connection_id)
 141 {
 142         if (!imc_attestation)
 143         {
 144                 DBG1(DBG_IMC, "IMC \"%s\" has not been initialized", imc_name);
 145                 return TNC_RESULT_NOT_INITIALIZED;
 146         }
 147
 148         return TNC_RESULT_SUCCESS;
 149 }
 150
 151 static TNC_Result receive_message(imc_state_t *state, imc_msg_t *in_msg)
 152 {
 153         imc_msg_t *out_msg;
 154         imc_attestation_state_t *attestation_state;
 155         enumerator_t *enumerator;
 156         pa_tnc_attr_t *attr;
 157         pen_type_t type;
 158         TNC_Result result;
 159         bool fatal_error = FALSE;
 160
 161         /* parse received PA-TNC message and handle local and remote errors */
 162         result = in_msg->receive(in_msg, &fatal_error);
 163         if (result != TNC_RESULT_SUCCESS)
 164         {
 165                 return result;
 166         }
 167         out_msg = imc_msg_create_as_reply(in_msg);
 168
 169         /* analyze PA-TNC attributes */
 170         enumerator = in_msg->create_attribute_enumerator(in_msg);
 171         while (enumerator->enumerate(enumerator, &attr))
 172         {
 173                 type = attr->get_type(attr);
 174
 175                 if (type.vendor_id == PEN_IETF)
 176                 {
 177                         if (type.type == IETF_ATTR_PA_TNC_ERROR)
 178                         {
 179                                 ietf_attr_pa_tnc_error_t *error_attr;
 180                                 pen_type_t error_code;
 181                                 chunk_t msg_info;
 182
 183                                 error_attr = (ietf_attr_pa_tnc_error_t*)attr;
 184                                 error_code = error_attr->get_error_code(error_attr);
 185
 186                                 if (error_code.vendor_id == PEN_TCG)
 187                                 {
 188                                         msg_info = error_attr->get_msg_info(error_attr);
 189
 190                                         DBG1(DBG_IMC, "received TCG-PTS error '%N'",
 191                                                  pts_error_code_names, error_code.type);
 192                                         DBG1(DBG_IMC, "error information: %B", &msg_info);
 193
 194                                         result = TNC_RESULT_FATAL;
 195                                 }
 196                         }
 197                 }
 198                 else if (type.vendor_id == PEN_TCG)
 199                 {
 200                         attestation_state = (imc_attestation_state_t*)state;
 201
 202                         if (!imc_attestation_process(attr, out_msg, attestation_state,
 203                                 supported_algorithms, supported_dh_groups))
 204                         {
 205                                 result = TNC_RESULT_FATAL;
 206                                 break;
 207                         }
 208                 }
 209         }
 210         enumerator->destroy(enumerator);
 211
 212         if (result == TNC_RESULT_SUCCESS)
 213         {
 214                 /* send PA-TNC message with the excl flag set */
 215                 result = out_msg->send(out_msg, TRUE);
 216         }
 217         out_msg->destroy(out_msg);
 218
 219         return result;
 220 }
 221
 222 /**
 223  * see section 3.8.4 of TCG TNC IF-IMC Specification 1.3
 224  */
 225 TNC_Result TNC_IMC_ReceiveMessage(TNC_IMCID imc_id,
 226                                                                   TNC_ConnectionID connection_id,
 227                                                                   TNC_BufferReference msg,
 228                                                                   TNC_UInt32 msg_len,
 229                                                                   TNC_MessageType msg_type)
 230 {
 231         imc_state_t *state;
 232         imc_msg_t *in_msg;
 233         TNC_Result result;
 234
 235         if (!imc_attestation)
 236         {
 237                 DBG1(DBG_IMC, "IMC \"%s\" has not been initialized", imc_name);
 238                 return TNC_RESULT_NOT_INITIALIZED;
 239         }
 240         if (!imc_attestation->get_state(imc_attestation, connection_id, &state))
 241         {
 242                 return TNC_RESULT_FATAL;
 243         }
 244
 245         in_msg = imc_msg_create_from_data(imc_attestation, state, connection_id,
 246                                                                           msg_type, chunk_create(msg, msg_len));
 247         result = receive_message(state, in_msg);
 248         in_msg->destroy(in_msg);
 249
 250         return result;
 251 }
 252
 253 /**
 254  * see section 3.8.6 of TCG TNC IF-IMV Specification 1.3
 255  */
 256 TNC_Result TNC_IMC_ReceiveMessageLong(TNC_IMCID imc_id,
 257                                                                           TNC_ConnectionID connection_id,
 258                                                                           TNC_UInt32 msg_flags,
 259                                                                           TNC_BufferReference msg,
 260                                                                           TNC_UInt32 msg_len,
 261                                                                           TNC_VendorID msg_vid,
 262                                                                           TNC_MessageSubtype msg_subtype,
 263                                                                           TNC_UInt32 src_imv_id,
 264                                                                           TNC_UInt32 dst_imc_id)
 265 {
 266         imc_state_t *state;
 267         imc_msg_t *in_msg;
 268         TNC_Result result;
 269
 270         if (!imc_attestation)
 271         {
 272                 DBG1(DBG_IMC, "IMC \"%s\" has not been initialized", imc_name);
 273                 return TNC_RESULT_NOT_INITIALIZED;
 274         }
 275         if (!imc_attestation->get_state(imc_attestation, connection_id, &state))
 276         {
 277                 return TNC_RESULT_FATAL;
 278         }
 279         in_msg = imc_msg_create_from_long_data(imc_attestation, state, connection_id,
 280                                                                 src_imv_id, dst_imc_id, msg_vid, msg_subtype,
 281                                                                 chunk_create(msg, msg_len));
 282         result =receive_message(state, in_msg);
 283         in_msg->destroy(in_msg);
 284
 285         return result;
 286 }
 287
 288 /**
 289  * see section 3.8.7 of TCG TNC IF-IMC Specification 1.3
 290  */
 291 TNC_Result TNC_IMC_BatchEnding(TNC_IMCID imc_id,
 292                                                            TNC_ConnectionID connection_id)
 293 {
 294         if (!imc_attestation)
 295         {
 296                 DBG1(DBG_IMC, "IMC \"%s\" has not been initialized", imc_name);
 297                 return TNC_RESULT_NOT_INITIALIZED;
 298         }
 299         return TNC_RESULT_SUCCESS;
 300 }
 301
 302 /**
 303  * see section 3.8.8 of TCG TNC IF-IMC Specification 1.3
 304  */
 305 TNC_Result TNC_IMC_Terminate(TNC_IMCID imc_id)
 306 {
 307         if (!imc_attestation)
 308         {
 309                 DBG1(DBG_IMC, "IMC \"%s\" has not been initialized", imc_name);
 310                 return TNC_RESULT_NOT_INITIALIZED;
 311         }
 312
 313         libpts_deinit();
 314
 315         imc_attestation->destroy(imc_attestation);
 316         imc_attestation = NULL;
 317
 318         return TNC_RESULT_SUCCESS;
 319 }
 320
 321 /**
 322  * see section 4.2.8.1 of TCG TNC IF-IMC Specification 1.3
 323  */
 324 TNC_Result TNC_IMC_ProvideBindFunction(TNC_IMCID imc_id,
 325                                                                 TNC_TNCC_BindFunctionPointer bind_function)
 326 {
 327         if (!imc_attestation)
 328         {
 329                 DBG1(DBG_IMC, "IMC \"%s\" has not been initialized", imc_name);
 330                 return TNC_RESULT_NOT_INITIALIZED;
 331         }
 332         return imc_attestation->bind_functions(imc_attestation, bind_function);
 333 }