340 lines
8.6 KiB
C
340 lines
8.6 KiB
C
/*
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* Copyright (C) 2011-2012 Sansar Choinyambuu, Andreas Steffen
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* HSR Hochschule fuer Technik Rapperswil
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* for more details.
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*/
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#include "imc_attestation_state.h"
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#include "imc_attestation_process.h"
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#include <imc/imc_agent.h>
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#include <imc/imc_msg.h>
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#include <ietf/ietf_attr.h>
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#include <ietf/ietf_attr_pa_tnc_error.h>
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#include <ietf/ietf_attr_product_info.h>
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#include <ietf/ietf_attr_string_version.h>
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#include <ietf/ietf_attr_assess_result.h>
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#include <os_info/os_info.h>
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#include <libpts.h>
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#include <pts/pts_error.h>
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#include <tcg/pts/tcg_pts_attr_proto_caps.h>
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#include <tcg/pts/tcg_pts_attr_meas_algo.h>
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#include <tncif_pa_subtypes.h>
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#include <pen/pen.h>
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#include <utils/debug.h>
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#include <collections/linked_list.h>
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/* IMC definitions */
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static const char imc_name[] = "Attestation";
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static pen_type_t msg_types[] = {
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{ PEN_TCG, PA_SUBTYPE_TCG_PTS }
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};
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static imc_agent_t *imc_attestation;
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/**
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* Supported PTS measurement algorithms
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*/
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static pts_meas_algorithms_t supported_algorithms = PTS_MEAS_ALGO_NONE;
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/**
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* Supported PTS Diffie Hellman Groups
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*/
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static pts_dh_group_t supported_dh_groups = PTS_DH_GROUP_NONE;
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/**
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* see section 3.8.1 of TCG TNC IF-IMC Specification 1.3
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*/
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TNC_Result TNC_IMC_Initialize(TNC_IMCID imc_id,
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TNC_Version min_version,
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TNC_Version max_version,
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TNC_Version *actual_version)
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{
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bool mandatory_dh_groups;
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if (imc_attestation)
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{
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DBG1(DBG_IMC, "IMC \"%s\" has already been initialized", imc_name);
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return TNC_RESULT_ALREADY_INITIALIZED;
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}
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imc_attestation = imc_agent_create(imc_name, msg_types, countof(msg_types),
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imc_id, actual_version);
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if (!imc_attestation)
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{
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return TNC_RESULT_FATAL;
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}
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mandatory_dh_groups = lib->settings->get_bool(lib->settings,
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"%s.plugins.imc-attestation.mandatory_dh_groups", TRUE, lib->ns);
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if (!pts_meas_algo_probe(&supported_algorithms) ||
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!pts_dh_group_probe(&supported_dh_groups, mandatory_dh_groups))
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{
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imc_attestation->destroy(imc_attestation);
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imc_attestation = NULL;
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return TNC_RESULT_FATAL;
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}
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libpts_init();
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if (min_version > TNC_IFIMC_VERSION_1 || max_version < TNC_IFIMC_VERSION_1)
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{
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DBG1(DBG_IMC, "no common IF-IMC version");
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return TNC_RESULT_NO_COMMON_VERSION;
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}
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return TNC_RESULT_SUCCESS;
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}
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/**
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* see section 3.8.2 of TCG TNC IF-IMC Specification 1.3
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*/
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TNC_Result TNC_IMC_NotifyConnectionChange(TNC_IMCID imc_id,
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TNC_ConnectionID connection_id,
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TNC_ConnectionState new_state)
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{
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imc_state_t *state;
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if (!imc_attestation)
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{
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DBG1(DBG_IMC, "IMC \"%s\" has not been initialized", imc_name);
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return TNC_RESULT_NOT_INITIALIZED;
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}
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switch (new_state)
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{
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case TNC_CONNECTION_STATE_CREATE:
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state = imc_attestation_state_create(connection_id);
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return imc_attestation->create_state(imc_attestation, state);
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case TNC_CONNECTION_STATE_HANDSHAKE:
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if (imc_attestation->change_state(imc_attestation, connection_id,
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new_state, &state) != TNC_RESULT_SUCCESS)
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{
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return TNC_RESULT_FATAL;
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}
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state->set_result(state, imc_id,
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TNC_IMV_EVALUATION_RESULT_DONT_KNOW);
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return TNC_RESULT_SUCCESS;
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case TNC_CONNECTION_STATE_DELETE:
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return imc_attestation->delete_state(imc_attestation, connection_id);
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case TNC_CONNECTION_STATE_ACCESS_ISOLATED:
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case TNC_CONNECTION_STATE_ACCESS_NONE:
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default:
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return imc_attestation->change_state(imc_attestation, connection_id,
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new_state, NULL);
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}
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}
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/**
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* see section 3.8.3 of TCG TNC IF-IMC Specification 1.3
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*/
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TNC_Result TNC_IMC_BeginHandshake(TNC_IMCID imc_id,
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TNC_ConnectionID connection_id)
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{
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if (!imc_attestation)
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{
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DBG1(DBG_IMC, "IMC \"%s\" has not been initialized", imc_name);
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return TNC_RESULT_NOT_INITIALIZED;
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}
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return TNC_RESULT_SUCCESS;
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}
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static TNC_Result receive_message(imc_state_t *state, imc_msg_t *in_msg)
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{
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imc_msg_t *out_msg;
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imc_attestation_state_t *attestation_state;
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enumerator_t *enumerator;
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pa_tnc_attr_t *attr;
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pen_type_t type;
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TNC_Result result;
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bool fatal_error = FALSE;
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/* parse received PA-TNC message and handle local and remote errors */
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result = in_msg->receive(in_msg, &fatal_error);
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if (result != TNC_RESULT_SUCCESS)
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{
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return result;
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}
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out_msg = imc_msg_create_as_reply(in_msg);
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/* analyze PA-TNC attributes */
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enumerator = in_msg->create_attribute_enumerator(in_msg);
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while (enumerator->enumerate(enumerator, &attr))
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{
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type = attr->get_type(attr);
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if (type.vendor_id == PEN_IETF)
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{
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if (type.type == IETF_ATTR_PA_TNC_ERROR)
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{
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ietf_attr_pa_tnc_error_t *error_attr;
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pen_type_t error_code;
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chunk_t msg_info;
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error_attr = (ietf_attr_pa_tnc_error_t*)attr;
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error_code = error_attr->get_error_code(error_attr);
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if (error_code.vendor_id == PEN_TCG)
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{
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msg_info = error_attr->get_msg_info(error_attr);
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DBG1(DBG_IMC, "received TCG-PTS error '%N'",
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pts_error_code_names, error_code.type);
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DBG1(DBG_IMC, "error information: %B", &msg_info);
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result = TNC_RESULT_FATAL;
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}
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}
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}
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else if (type.vendor_id == PEN_TCG)
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{
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attestation_state = (imc_attestation_state_t*)state;
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if (!imc_attestation_process(attr, out_msg, attestation_state,
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supported_algorithms, supported_dh_groups))
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{
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result = TNC_RESULT_FATAL;
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break;
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}
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}
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}
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enumerator->destroy(enumerator);
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if (result == TNC_RESULT_SUCCESS)
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{
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/* send PA-TNC message with the excl flag set */
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result = out_msg->send(out_msg, TRUE);
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}
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out_msg->destroy(out_msg);
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return result;
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}
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/**
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* see section 3.8.4 of TCG TNC IF-IMC Specification 1.3
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*/
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TNC_Result TNC_IMC_ReceiveMessage(TNC_IMCID imc_id,
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TNC_ConnectionID connection_id,
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TNC_BufferReference msg,
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TNC_UInt32 msg_len,
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TNC_MessageType msg_type)
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{
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imc_state_t *state;
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imc_msg_t *in_msg;
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TNC_Result result;
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if (!imc_attestation)
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{
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DBG1(DBG_IMC, "IMC \"%s\" has not been initialized", imc_name);
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return TNC_RESULT_NOT_INITIALIZED;
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}
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if (!imc_attestation->get_state(imc_attestation, connection_id, &state))
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{
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return TNC_RESULT_FATAL;
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}
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in_msg = imc_msg_create_from_data(imc_attestation, state, connection_id,
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msg_type, chunk_create(msg, msg_len));
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result = receive_message(state, in_msg);
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in_msg->destroy(in_msg);
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return result;
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}
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/**
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* see section 3.8.6 of TCG TNC IF-IMV Specification 1.3
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*/
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TNC_Result TNC_IMC_ReceiveMessageLong(TNC_IMCID imc_id,
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TNC_ConnectionID connection_id,
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TNC_UInt32 msg_flags,
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TNC_BufferReference msg,
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TNC_UInt32 msg_len,
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TNC_VendorID msg_vid,
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TNC_MessageSubtype msg_subtype,
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TNC_UInt32 src_imv_id,
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TNC_UInt32 dst_imc_id)
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{
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imc_state_t *state;
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imc_msg_t *in_msg;
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TNC_Result result;
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if (!imc_attestation)
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{
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DBG1(DBG_IMC, "IMC \"%s\" has not been initialized", imc_name);
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return TNC_RESULT_NOT_INITIALIZED;
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}
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if (!imc_attestation->get_state(imc_attestation, connection_id, &state))
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{
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return TNC_RESULT_FATAL;
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}
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in_msg = imc_msg_create_from_long_data(imc_attestation, state, connection_id,
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src_imv_id, dst_imc_id, msg_vid, msg_subtype,
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chunk_create(msg, msg_len));
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result =receive_message(state, in_msg);
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in_msg->destroy(in_msg);
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return result;
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}
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/**
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* see section 3.8.7 of TCG TNC IF-IMC Specification 1.3
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*/
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TNC_Result TNC_IMC_BatchEnding(TNC_IMCID imc_id,
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TNC_ConnectionID connection_id)
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{
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if (!imc_attestation)
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{
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DBG1(DBG_IMC, "IMC \"%s\" has not been initialized", imc_name);
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return TNC_RESULT_NOT_INITIALIZED;
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}
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return TNC_RESULT_SUCCESS;
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}
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/**
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* see section 3.8.8 of TCG TNC IF-IMC Specification 1.3
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*/
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TNC_Result TNC_IMC_Terminate(TNC_IMCID imc_id)
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{
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if (!imc_attestation)
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{
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DBG1(DBG_IMC, "IMC \"%s\" has not been initialized", imc_name);
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return TNC_RESULT_NOT_INITIALIZED;
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}
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libpts_deinit();
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imc_attestation->destroy(imc_attestation);
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imc_attestation = NULL;
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return TNC_RESULT_SUCCESS;
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}
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/**
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* see section 4.2.8.1 of TCG TNC IF-IMC Specification 1.3
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*/
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TNC_Result TNC_IMC_ProvideBindFunction(TNC_IMCID imc_id,
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TNC_TNCC_BindFunctionPointer bind_function)
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{
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if (!imc_attestation)
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{
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DBG1(DBG_IMC, "IMC \"%s\" has not been initialized", imc_name);
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return TNC_RESULT_NOT_INITIALIZED;
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}
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return imc_attestation->bind_functions(imc_attestation, bind_function);
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}
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