1 files changed, 520 insertions, 0 deletions

diff --git a/src/libpts/plugins/imv_attestation/imv_attestation.c b/src/libpts/plugins/imv_attestation/imv_attestation.c
new file mode 100644
index 000000000..51069b02d
--- /dev/null
+++ b/src/libpts/plugins/imv_attestation/imv_attestation.c
@@ -0,0 +1,520 @@
+/*
+ * Copyright (C) 2011 Sansar Choinyambuu
+ * 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 "imv_attestation_state.h"
+#include "imv_attestation_process.h"
+#include "imv_attestation_build.h"
+
+#include <imv/imv_agent.h>
+#include <pa_tnc/pa_tnc_msg.h>
+#include <ietf/ietf_attr.h>
+#include <ietf/ietf_attr_pa_tnc_error.h>
+#include <ietf/ietf_attr_product_info.h>
+
+#include <libpts.h>
+
+#include <pts/pts.h>
+#include <pts/pts_database.h>
+#include <pts/pts_creds.h>
+
+#include <tcg/tcg_attr.h>
+
+#include <tncif_pa_subtypes.h>
+
+#include <pen/pen.h>
+#include <debug.h>
+#include <credentials/credential_manager.h>
+#include <utils/linked_list.h>
+
+/* IMV definitions */
+
+static const char imv_name[] = "Attestation";
+
+#define IMV_VENDOR_ID			PEN_TCG
+#define IMV_SUBTYPE				PA_SUBTYPE_TCG_PTS
+
+static imv_agent_t *imv_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;
+
+/**
+ * PTS file measurement database
+ */
+static pts_database_t *pts_db;
+
+/**
+ * PTS credentials
+ */
+static pts_creds_t *pts_creds;
+
+/**
+ * PTS credential manager
+ */
+static credential_manager_t *pts_credmgr;
+
+/**
+ * see section 3.8.1 of TCG TNC IF-IMV Specification 1.3
+ */
+TNC_Result TNC_IMV_Initialize(TNC_IMVID imv_id,
+							  TNC_Version min_version,
+							  TNC_Version max_version,
+							  TNC_Version *actual_version)
+{
+	char *hash_alg, *dh_group, *uri, *cadir;
+
+	if (imv_attestation)
+	{
+		DBG1(DBG_IMV, "IMV \"%s\" has already been initialized", imv_name);
+		return TNC_RESULT_ALREADY_INITIALIZED;
+	}
+	if (!pts_meas_algo_probe(&supported_algorithms) ||
+		!pts_dh_group_probe(&supported_dh_groups))
+	{
+		return TNC_RESULT_FATAL;
+	}
+	imv_attestation = imv_agent_create(imv_name, IMV_VENDOR_ID, IMV_SUBTYPE,
+									   imv_id, actual_version);
+	if (!imv_attestation)
+	{
+		return TNC_RESULT_FATAL;
+	}
+
+	libpts_init();
+	
+	if (min_version > TNC_IFIMV_VERSION_1 || max_version < TNC_IFIMV_VERSION_1)
+	{
+		DBG1(DBG_IMV, "no common IF-IMV version");
+		return TNC_RESULT_NO_COMMON_VERSION;
+	}
+
+	hash_alg = lib->settings->get_str(lib->settings,
+				"libimcv.plugins.imv-attestation.hash_algorithm", "sha256");
+	dh_group = lib->settings->get_str(lib->settings,
+				"libimcv.plugins.imv-attestation.dh_group", "ecp256");
+
+	if (!pts_meas_algo_update(hash_alg, &supported_algorithms) ||
+		!pts_dh_group_update(dh_group, &supported_dh_groups))
+	{
+		return TNC_RESULT_FATAL;
+	}
+
+	/* create a PTS credential manager */
+	pts_credmgr = credential_manager_create();
+
+	/* create PTS credential set */
+	cadir = lib->settings->get_str(lib->settings,
+				"libimcv.plugins.imv-attestation.cadir", NULL);
+	pts_creds = pts_creds_create(cadir);
+	if (pts_creds)
+	{
+		pts_credmgr->add_set(pts_credmgr, pts_creds->get_set(pts_creds));
+	}
+
+	/* attach file measurement database */
+	uri = lib->settings->get_str(lib->settings,
+				"libimcv.plugins.imv-attestation.database", NULL);
+	pts_db = pts_database_create(uri);
+
+	return TNC_RESULT_SUCCESS;
+}
+
+/**
+ * see section 3.8.2 of TCG TNC IF-IMV Specification 1.3
+ */
+TNC_Result TNC_IMV_NotifyConnectionChange(TNC_IMVID imv_id,
+										  TNC_ConnectionID connection_id,
+										  TNC_ConnectionState new_state)
+{
+	imv_state_t *state;
+
+	if (!imv_attestation)
+	{
+		DBG1(DBG_IMV, "IMV \"%s\" has not been initialized", imv_name);
+		return TNC_RESULT_NOT_INITIALIZED;
+	}
+	switch (new_state)
+	{
+		case TNC_CONNECTION_STATE_CREATE:
+			state = imv_attestation_state_create(connection_id);
+			return imv_attestation->create_state(imv_attestation, state);
+		case TNC_CONNECTION_STATE_DELETE:
+			return imv_attestation->delete_state(imv_attestation, connection_id);
+		case TNC_CONNECTION_STATE_HANDSHAKE:
+		default:
+			return imv_attestation->change_state(imv_attestation, connection_id,
+												 new_state, NULL);
+	}
+}
+
+static TNC_Result send_message(TNC_ConnectionID connection_id)
+{
+	pa_tnc_msg_t *msg;
+	pa_tnc_attr_t *attr;
+	imv_state_t *state;
+	imv_attestation_state_t *attestation_state;
+	TNC_Result result;
+	linked_list_t *attr_list;
+	enumerator_t *enumerator;
+
+	if (!imv_attestation->get_state(imv_attestation, connection_id, &state))
+	{
+		return TNC_RESULT_FATAL;
+	}
+	attestation_state = (imv_attestation_state_t*)state;
+	attr_list = linked_list_create();
+
+	if (imv_attestation_build(attr_list, attestation_state, supported_algorithms,
+							  supported_dh_groups, pts_db))
+	{
+		if (attr_list->get_count(attr_list))
+		{
+			msg = pa_tnc_msg_create();
+
+			/* move PA-TNC attributes to PA-TNC message */
+			enumerator = attr_list->create_enumerator(attr_list);
+			while (enumerator->enumerate(enumerator, &attr))
+			{
+				msg->add_attribute(msg, attr);
+			}
+			enumerator->destroy(enumerator);
+
+			msg->build(msg);
+			result = imv_attestation->send_message(imv_attestation,
+							connection_id, FALSE, 0, TNC_IMCID_ANY,
+							msg->get_encoding(msg));
+			msg->destroy(msg);
+		}
+		else
+		{
+			result = TNC_RESULT_SUCCESS;
+		}
+		attr_list->destroy(attr_list);
+	}
+	else
+	{
+		attr_list->destroy_offset(attr_list, offsetof(pa_tnc_attr_t, destroy));
+		result = TNC_RESULT_FATAL;
+	}
+
+	return result;
+}
+
+static TNC_Result receive_message(TNC_IMVID imv_id,
+								  TNC_ConnectionID connection_id,
+								  TNC_UInt32 msg_flags,
+								  chunk_t msg,
+								  TNC_VendorID msg_vid,
+								  TNC_MessageSubtype msg_subtype,
+								  TNC_UInt32 src_imc_id,
+								  TNC_UInt32 dst_imv_id)
+{
+	pa_tnc_msg_t *pa_tnc_msg;
+	pa_tnc_attr_t *attr;
+	linked_list_t *attr_list;
+	imv_state_t *state;
+	imv_attestation_state_t *attestation_state;
+	pts_t *pts;
+	enumerator_t *enumerator;
+	TNC_Result result;
+
+	if (!imv_attestation)
+	{
+		DBG1(DBG_IMV, "IMV \"%s\" has not been initialized", imv_name);
+		return TNC_RESULT_NOT_INITIALIZED;
+	}
+
+	/* get current IMV state */
+	if (!imv_attestation->get_state(imv_attestation, connection_id, &state))
+	{
+		return TNC_RESULT_FATAL;
+	}
+	attestation_state = (imv_attestation_state_t*)state;
+	pts = attestation_state->get_pts(attestation_state);
+
+	/* parse received PA-TNC message and automatically handle any errors */
+	result = imv_attestation->receive_message(imv_attestation, state, msg,
+					 msg_vid, msg_subtype, src_imc_id, dst_imv_id, &pa_tnc_msg);
+
+	/* no parsed PA-TNC attributes available if an error occurred */
+	if (!pa_tnc_msg)
+	{
+		return result;
+	}
+
+	/* preprocess any IETF standard error attributes */
+	result = pa_tnc_msg->process_ietf_std_errors(pa_tnc_msg) ?
+					TNC_RESULT_FATAL : TNC_RESULT_SUCCESS;
+
+	attr_list = linked_list_create();
+
+	/* analyze PA-TNC attributes */
+	enumerator = pa_tnc_msg->create_attribute_enumerator(pa_tnc_msg);
+	while (enumerator->enumerate(enumerator, &attr))
+	{
+		if (attr->get_vendor_id(attr) == PEN_IETF)
+		{
+			if (attr->get_type(attr) == IETF_ATTR_PA_TNC_ERROR)
+			{
+				ietf_attr_pa_tnc_error_t *error_attr;
+				pen_t error_vendor_id;
+				pa_tnc_error_code_t error_code;
+				chunk_t msg_info;
+
+				error_attr = (ietf_attr_pa_tnc_error_t*)attr;
+				error_vendor_id = error_attr->get_vendor_id(error_attr);
+
+				if (error_vendor_id == PEN_TCG)
+				{
+					error_code = error_attr->get_error_code(error_attr);
+					msg_info = error_attr->get_msg_info(error_attr);
+
+					DBG1(DBG_IMV, "received TCG-PTS error '%N'",
+						 pts_error_code_names, error_code);
+					DBG1(DBG_IMV, "error information: %B", &msg_info);
+
+					result = TNC_RESULT_FATAL;
+				}
+			}
+			else if (attr->get_type(attr) == IETF_ATTR_PRODUCT_INFORMATION)
+			{
+				ietf_attr_product_info_t *attr_cast;
+				char *platform_info;
+
+				attr_cast = (ietf_attr_product_info_t*)attr;
+				platform_info = attr_cast->get_info(attr_cast, NULL, NULL);
+				pts->set_platform_info(pts, platform_info);
+			}
+		}
+		else if (attr->get_vendor_id(attr) == PEN_TCG)
+		{
+			if (!imv_attestation_process(attr, attr_list, attestation_state,
+				supported_algorithms,supported_dh_groups, pts_db, pts_credmgr))
+			{
+				result = TNC_RESULT_FATAL;
+				break;
+			}
+		}
+	}
+	enumerator->destroy(enumerator);
+	pa_tnc_msg->destroy(pa_tnc_msg);
+
+	if (result != TNC_RESULT_SUCCESS)
+	{
+		attr_list->destroy_offset(attr_list, offsetof(pa_tnc_attr_t, destroy));
+		state->set_recommendation(state,
+								TNC_IMV_ACTION_RECOMMENDATION_ISOLATE,
+								TNC_IMV_EVALUATION_RESULT_ERROR);
+		return imv_attestation->provide_recommendation(imv_attestation,
+													   connection_id);
+	}
+
+	if (attr_list->get_count(attr_list))
+	{
+		pa_tnc_msg = pa_tnc_msg_create();
+
+		/* move PA-TNC attributes to PA-TNC message */
+		enumerator = attr_list->create_enumerator(attr_list);
+		while (enumerator->enumerate(enumerator, &attr))
+		{
+			pa_tnc_msg->add_attribute(pa_tnc_msg, attr);
+		}
+		enumerator->destroy(enumerator);
+
+		pa_tnc_msg->build(pa_tnc_msg);
+		result = imv_attestation->send_message(imv_attestation, connection_id,
+										FALSE, 0, TNC_IMCID_ANY,
+										pa_tnc_msg->get_encoding(pa_tnc_msg));
+		
+		pa_tnc_msg->destroy(pa_tnc_msg);
+		attr_list->destroy(attr_list);
+		
+		return result;
+	}
+	attr_list->destroy(attr_list);
+
+	/* check the IMV state for the next PA-TNC attributes to send */
+	result = send_message(connection_id);
+	if (result != TNC_RESULT_SUCCESS)
+	{
+		state->set_recommendation(state,
+								TNC_IMV_ACTION_RECOMMENDATION_NO_RECOMMENDATION,
+								TNC_IMV_EVALUATION_RESULT_ERROR);
+		return imv_attestation->provide_recommendation(imv_attestation,
+													   connection_id);
+	}
+
+	if (attestation_state->get_handshake_state(attestation_state) ==
+		IMV_ATTESTATION_STATE_END)
+	{
+		if (attestation_state->get_file_meas_request_count(attestation_state))
+		{
+			DBG1(DBG_IMV, "failure due to %d pending file measurements",
+				attestation_state->get_file_meas_request_count(attestation_state));
+			attestation_state->set_measurement_error(attestation_state);
+		}
+		if (attestation_state->get_component_count(attestation_state))
+		{
+			DBG1(DBG_IMV, "failure due to %d components waiting for evidence",
+				 attestation_state->get_component_count(attestation_state));
+			attestation_state->set_measurement_error(attestation_state);
+		}
+		if (attestation_state->get_measurement_error(attestation_state))
+		{
+			state->set_recommendation(state,
+								TNC_IMV_ACTION_RECOMMENDATION_ISOLATE,
+								TNC_IMV_EVALUATION_RESULT_NONCOMPLIANT_MAJOR);
+		}
+		else
+		{
+			state->set_recommendation(state,
+								TNC_IMV_ACTION_RECOMMENDATION_ALLOW,
+								TNC_IMV_EVALUATION_RESULT_COMPLIANT);
+		}
+		return imv_attestation->provide_recommendation(imv_attestation,
+													   connection_id);
+	}
+
+	return result;
+}
+
+/**
+ * see section 3.8.4 of TCG TNC IF-IMV Specification 1.3
+ */
+TNC_Result TNC_IMV_ReceiveMessage(TNC_IMVID imv_id,
+								  TNC_ConnectionID connection_id,
+								  TNC_BufferReference msg,
+								  TNC_UInt32 msg_len,
+								  TNC_MessageType msg_type)
+{
+	TNC_VendorID msg_vid;
+	TNC_MessageSubtype msg_subtype;
+
+	msg_vid = msg_type >> 8;
+	msg_subtype = msg_type & TNC_SUBTYPE_ANY;
+
+	return receive_message(imv_id, connection_id, 0, chunk_create(msg, msg_len),
+						   msg_vid,	msg_subtype, 0, TNC_IMVID_ANY);
+}
+
+/**
+ * see section 3.8.6 of TCG TNC IF-IMV Specification 1.3
+ */
+TNC_Result TNC_IMV_ReceiveMessageLong(TNC_IMVID imv_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_imc_id,
+									  TNC_UInt32 dst_imv_id)
+{
+	return receive_message(imv_id, connection_id, msg_flags,
+						   chunk_create(msg, msg_len), msg_vid, msg_subtype,
+						   src_imc_id, dst_imv_id);
+}
+
+/**
+ * see section 3.8.7 of TCG TNC IF-IMV Specification 1.3
+ */
+TNC_Result TNC_IMV_SolicitRecommendation(TNC_IMVID imv_id,
+										 TNC_ConnectionID connection_id)
+{
+	if (!imv_attestation)
+	{
+		DBG1(DBG_IMV, "IMV \"%s\" has not been initialized", imv_name);
+		return TNC_RESULT_NOT_INITIALIZED;
+	}
+	return imv_attestation->provide_recommendation(imv_attestation,
+												   connection_id);
+}
+
+/**
+ * see section 3.8.8 of TCG TNC IF-IMV Specification 1.3
+ */
+TNC_Result TNC_IMV_BatchEnding(TNC_IMVID imv_id,
+							   TNC_ConnectionID connection_id)
+{
+	imv_state_t *state;
+	imv_attestation_state_t *attestation_state;
+
+	if (!imv_attestation)
+	{
+		DBG1(DBG_IMV, "IMV \"%s\" has not been initialized", imv_name);
+		return TNC_RESULT_NOT_INITIALIZED;
+	}
+	/* get current IMV state */
+	if (!imv_attestation->get_state(imv_attestation, connection_id, &state))
+	{
+		return TNC_RESULT_FATAL;
+	}
+	attestation_state = (imv_attestation_state_t*)state;
+
+	/* Check if IMV has to initiate the PA-TNC exchange */
+	if (attestation_state->get_handshake_state(attestation_state) ==
+		IMV_ATTESTATION_STATE_INIT)
+	{
+		return send_message(connection_id);
+	}
+	return TNC_RESULT_SUCCESS;
+}
+
+/**
+ * see section 3.8.9 of TCG TNC IF-IMV Specification 1.3
+ */
+TNC_Result TNC_IMV_Terminate(TNC_IMVID imv_id)
+{
+	if (!imv_attestation)
+	{
+		DBG1(DBG_IMV, "IMV \"%s\" has not been initialized", imv_name);
+		return TNC_RESULT_NOT_INITIALIZED;
+	}
+	if (pts_creds)
+	{
+		pts_credmgr->remove_set(pts_credmgr, pts_creds->get_set(pts_creds));
+		pts_creds->destroy(pts_creds);
+	}
+	DESTROY_IF(pts_db);
+	DESTROY_IF(pts_credmgr);
+
+	libpts_deinit();
+
+	imv_attestation->destroy(imv_attestation);
+	imv_attestation = NULL;
+
+	return TNC_RESULT_SUCCESS;
+}
+
+/**
+ * see section 4.2.8.1 of TCG TNC IF-IMV Specification 1.3
+ */
+TNC_Result TNC_IMV_ProvideBindFunction(TNC_IMVID imv_id,
+								TNC_TNCS_BindFunctionPointer bind_function)
+{
+	if (!imv_attestation)
+	{
+		DBG1(DBG_IMV, "IMV \"%s\" has not been initialized", imv_name);
+		return TNC_RESULT_NOT_INITIALIZED;
+	}
+	return imv_attestation->bind_functions(imv_attestation, bind_function);
+}