/* * Copyright (C) 2011-2012 Sansar Choinyambuu * Copyright (C) 2011-2014 Andreas Steffen * HSR Hochschule fuer Technik Rapperswil * * This program is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License as published by the * Free Software Foundation; either version 2 of the License, or (at your * option) any later version. See . * * This program is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * for more details. */ #include "imc_attestation_state.h" #include "imc_attestation_process.h" #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include /* IMC definitions */ static const char imc_name[] = "Attestation"; static pen_type_t msg_types[] = { { PEN_TCG, PA_SUBTYPE_TCG_PTS } }; static imc_agent_t *imc_attestation; /** * Supported PTS measurement algorithms */ static pts_meas_algorithms_t supported_algorithms = PTS_MEAS_ALGO_NONE; /** * Supported PTS Diffie Hellman Groups */ static pts_dh_group_t supported_dh_groups = PTS_DH_GROUP_NONE; /** * see section 3.8.1 of TCG TNC IF-IMC Specification 1.3 */ TNC_Result TNC_IMC_API TNC_IMC_Initialize(TNC_IMCID imc_id, TNC_Version min_version, TNC_Version max_version, TNC_Version *actual_version) { bool mandatory_dh_groups; if (imc_attestation) { DBG1(DBG_IMC, "IMC \"%s\" has already been initialized", imc_name); return TNC_RESULT_ALREADY_INITIALIZED; } imc_attestation = imc_agent_create(imc_name, msg_types, countof(msg_types), imc_id, actual_version); if (!imc_attestation) { return TNC_RESULT_FATAL; } mandatory_dh_groups = lib->settings->get_bool(lib->settings, "%s.plugins.imc-attestation.mandatory_dh_groups", TRUE, lib->ns); if (!pts_meas_algo_probe(&supported_algorithms) || !pts_dh_group_probe(&supported_dh_groups, mandatory_dh_groups)) { imc_attestation->destroy(imc_attestation); imc_attestation = NULL; return TNC_RESULT_FATAL; } if (min_version > TNC_IFIMC_VERSION_1 || max_version < TNC_IFIMC_VERSION_1) { DBG1(DBG_IMC, "no common IF-IMC version"); return TNC_RESULT_NO_COMMON_VERSION; } return TNC_RESULT_SUCCESS; } /** * see section 3.8.2 of TCG TNC IF-IMC Specification 1.3 */ TNC_Result TNC_IMC_API TNC_IMC_NotifyConnectionChange(TNC_IMCID imc_id, TNC_ConnectionID connection_id, TNC_ConnectionState new_state) { imc_state_t *state; if (!imc_attestation) { DBG1(DBG_IMC, "IMC \"%s\" has not been initialized", imc_name); return TNC_RESULT_NOT_INITIALIZED; } switch (new_state) { case TNC_CONNECTION_STATE_CREATE: state = imc_attestation_state_create(connection_id); return imc_attestation->create_state(imc_attestation, state); case TNC_CONNECTION_STATE_HANDSHAKE: if (imc_attestation->change_state(imc_attestation, connection_id, new_state, &state) != TNC_RESULT_SUCCESS) { return TNC_RESULT_FATAL; } state->set_result(state, imc_id, TNC_IMV_EVALUATION_RESULT_DONT_KNOW); return TNC_RESULT_SUCCESS; case TNC_CONNECTION_STATE_DELETE: return imc_attestation->delete_state(imc_attestation, connection_id); case TNC_CONNECTION_STATE_ACCESS_ISOLATED: case TNC_CONNECTION_STATE_ACCESS_NONE: default: return imc_attestation->change_state(imc_attestation, connection_id, new_state, NULL); } } /** * see section 3.8.3 of TCG TNC IF-IMC Specification 1.3 */ TNC_Result TNC_IMC_API TNC_IMC_BeginHandshake(TNC_IMCID imc_id, TNC_ConnectionID connection_id) { if (!imc_attestation) { DBG1(DBG_IMC, "IMC \"%s\" has not been initialized", imc_name); return TNC_RESULT_NOT_INITIALIZED; } return TNC_RESULT_SUCCESS; } static TNC_Result receive_message(imc_state_t *state, imc_msg_t *in_msg) { imc_msg_t *out_msg; imc_attestation_state_t *attestation_state; enumerator_t *enumerator; pa_tnc_attr_t *attr; pen_type_t type; TNC_Result result; bool fatal_error = FALSE; /* generate an outgoing PA-TNC message - we might need it */ out_msg = imc_msg_create_as_reply(in_msg); /* parse received PA-TNC message and handle local and remote errors */ result = in_msg->receive(in_msg, out_msg, &fatal_error); if (result != TNC_RESULT_SUCCESS) { out_msg->destroy(out_msg); return result; } /* analyze PA-TNC attributes */ enumerator = in_msg->create_attribute_enumerator(in_msg); while (enumerator->enumerate(enumerator, &attr)) { type = attr->get_type(attr); if (type.vendor_id == PEN_IETF) { if (type.type == IETF_ATTR_PA_TNC_ERROR) { ietf_attr_pa_tnc_error_t *error_attr; pen_type_t error_code; chunk_t msg_info; error_attr = (ietf_attr_pa_tnc_error_t*)attr; error_code = error_attr->get_error_code(error_attr); if (error_code.vendor_id == PEN_TCG) { msg_info = error_attr->get_msg_info(error_attr); DBG1(DBG_IMC, "received TCG-PTS error '%N'", pts_error_code_names, error_code.type); DBG1(DBG_IMC, "error information: %B", &msg_info); result = TNC_RESULT_FATAL; } } } else if (type.vendor_id == PEN_TCG) { attestation_state = (imc_attestation_state_t*)state; if (!imc_attestation_process(attr, out_msg, attestation_state, supported_algorithms, supported_dh_groups)) { result = TNC_RESULT_FATAL; break; } } } enumerator->destroy(enumerator); if (result == TNC_RESULT_SUCCESS) { /* send PA-TNC message with the EXCL flag set */ result = out_msg->send(out_msg, TRUE); } out_msg->destroy(out_msg); return result; } /** * see section 3.8.4 of TCG TNC IF-IMC Specification 1.3 */ TNC_Result TNC_IMC_API TNC_IMC_ReceiveMessage(TNC_IMCID imc_id, TNC_ConnectionID connection_id, TNC_BufferReference msg, TNC_UInt32 msg_len, TNC_MessageType msg_type) { imc_state_t *state; imc_msg_t *in_msg; TNC_Result result; if (!imc_attestation) { DBG1(DBG_IMC, "IMC \"%s\" has not been initialized", imc_name); return TNC_RESULT_NOT_INITIALIZED; } if (!imc_attestation->get_state(imc_attestation, connection_id, &state)) { return TNC_RESULT_FATAL; } in_msg = imc_msg_create_from_data(imc_attestation, state, connection_id, msg_type, chunk_create(msg, msg_len)); result = receive_message(state, in_msg); in_msg->destroy(in_msg); return result; } /** * see section 3.8.6 of TCG TNC IF-IMV Specification 1.3 */ TNC_Result TNC_IMC_API TNC_IMC_ReceiveMessageLong(TNC_IMCID imc_id, TNC_ConnectionID connection_id, TNC_UInt32 msg_flags, TNC_BufferReference msg, TNC_UInt32 msg_len, TNC_VendorID msg_vid, TNC_MessageSubtype msg_subtype, TNC_UInt32 src_imv_id, TNC_UInt32 dst_imc_id) { imc_state_t *state; imc_msg_t *in_msg; TNC_Result result; if (!imc_attestation) { DBG1(DBG_IMC, "IMC \"%s\" has not been initialized", imc_name); return TNC_RESULT_NOT_INITIALIZED; } if (!imc_attestation->get_state(imc_attestation, connection_id, &state)) { return TNC_RESULT_FATAL; } in_msg = imc_msg_create_from_long_data(imc_attestation, state, connection_id, src_imv_id, dst_imc_id, msg_vid, msg_subtype, chunk_create(msg, msg_len)); result =receive_message(state, in_msg); in_msg->destroy(in_msg); return result; } /** * see section 3.8.7 of TCG TNC IF-IMC Specification 1.3 */ TNC_Result TNC_IMC_API TNC_IMC_BatchEnding(TNC_IMCID imc_id, TNC_ConnectionID connection_id) { if (!imc_attestation) { DBG1(DBG_IMC, "IMC \"%s\" has not been initialized", imc_name); return TNC_RESULT_NOT_INITIALIZED; } return TNC_RESULT_SUCCESS; } /** * see section 3.8.8 of TCG TNC IF-IMC Specification 1.3 */ TNC_Result TNC_IMC_API TNC_IMC_Terminate(TNC_IMCID imc_id) { if (!imc_attestation) { DBG1(DBG_IMC, "IMC \"%s\" has not been initialized", imc_name); return TNC_RESULT_NOT_INITIALIZED; } imc_attestation->destroy(imc_attestation); imc_attestation = NULL; return TNC_RESULT_SUCCESS; } /** * see section 4.2.8.1 of TCG TNC IF-IMC Specification 1.3 */ TNC_Result TNC_IMC_API TNC_IMC_ProvideBindFunction(TNC_IMCID imc_id, TNC_TNCC_BindFunctionPointer bind_function) { if (!imc_attestation) { DBG1(DBG_IMC, "IMC \"%s\" has not been initialized", imc_name); return TNC_RESULT_NOT_INITIALIZED; } return imc_attestation->bind_functions(imc_attestation, bind_function); }