diff options
Diffstat (limited to 'src/libimcv/plugins/imc_attestation/imc_attestation.c')
| -rw-r--r-- | src/libimcv/plugins/imc_attestation/imc_attestation.c | 335 |
1 files changed, 335 insertions, 0 deletions
diff --git a/src/libimcv/plugins/imc_attestation/imc_attestation.c b/src/libimcv/plugins/imc_attestation/imc_attestation.c new file mode 100644 index 000000000..0dd88b6a7 --- /dev/null +++ b/src/libimcv/plugins/imc_attestation/imc_attestation.c @@ -0,0 +1,335 @@ +/* + * 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 <http://www.fsf.org/copyleft/gpl.txt>. + * + * 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 <imc/imc_agent.h> +#include <imc/imc_msg.h> +#include <ietf/ietf_attr.h> +#include <ietf/ietf_attr_pa_tnc_error.h> +#include <ietf/ietf_attr_product_info.h> +#include <ietf/ietf_attr_string_version.h> +#include <ietf/ietf_attr_assess_result.h> +#include <tcg/pts/tcg_pts_attr_proto_caps.h> +#include <tcg/pts/tcg_pts_attr_meas_algo.h> +#include <os_info/os_info.h> +#include <pts/pts_error.h> + +#include <tncif_pa_subtypes.h> + +#include <pen/pen.h> +#include <utils/debug.h> +#include <collections/linked_list.h> + +/* 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); +} |