moved attestation plugins to libpts in order to resolve circular reference with libimcv

2011-11-28 21:23:59 +01:00
parent d37abe0fd9
commit b448e3ece6
27 changed files with 16 additions and 15 deletions
@@ -0,0 +1,286 @@
+/*
+ * 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_build.h"
+#include "imv_attestation_state.h"
+
+#include <libpts.h>
+#include <tcg/tcg_pts_attr_proto_caps.h>
+#include <tcg/tcg_pts_attr_meas_algo.h>
+#include <tcg/tcg_pts_attr_dh_nonce_params_req.h>
+#include <tcg/tcg_pts_attr_dh_nonce_finish.h>
+#include <tcg/tcg_pts_attr_get_tpm_version_info.h>
+#include <tcg/tcg_pts_attr_get_aik.h>
+#include <tcg/tcg_pts_attr_req_func_comp_evid.h>
+#include <tcg/tcg_pts_attr_gen_attest_evid.h>
+#include <tcg/tcg_pts_attr_req_file_meas.h>
+#include <tcg/tcg_pts_attr_req_file_meta.h>
+
+#include <debug.h>
+
+bool imv_attestation_build(pa_tnc_msg_t *msg,
+						   imv_attestation_state_t *attestation_state,
+						   pts_meas_algorithms_t supported_algorithms,
+						   pts_dh_group_t supported_dh_groups,
+						   pts_database_t *pts_db)
+{
+	imv_attestation_handshake_state_t handshake_state;
+	pts_t *pts;
+	pa_tnc_attr_t *attr = NULL;
+
+	handshake_state = attestation_state->get_handshake_state(attestation_state);
+	pts = attestation_state->get_pts(attestation_state);
+
+	/* D-H attributes are redundant */
+	/*  when D-H Nonce Exchange is not selected on IMC side */
+	if (handshake_state == IMV_ATTESTATION_STATE_NONCE_REQ &&
+		!(pts->get_proto_caps(pts) & PTS_PROTO_CAPS_D))
+	{
+		DBG1(DBG_IMV, "PTS-IMC is not using Diffie-Hellman Nonce negotiation,"
+					  "advancing to TPM Initialization phase");
+		handshake_state = IMV_ATTESTATION_STATE_TPM_INIT;
+	}
+	/* TPM Version Info, AIK attributes are redundant */
+	/*  when TPM is not available on IMC side */
+	if (handshake_state == IMV_ATTESTATION_STATE_TPM_INIT &&
+		!(pts->get_proto_caps(pts) & PTS_PROTO_CAPS_T))
+	{
+		DBG1(DBG_IMV, "PTS-IMC has not got TPM available,"
+					  "advancing to File Measurement phase");
+		handshake_state = IMV_ATTESTATION_STATE_MEAS;
+	}
+	/* Component Measurement cannot be done without D-H Nonce Exchange */
+	/*  or TPM on IMC side */
+	if (handshake_state == IMV_ATTESTATION_STATE_COMP_EVID &&
+		(!(pts->get_proto_caps(pts) & PTS_PROTO_CAPS_T) ||
+		!(pts->get_proto_caps(pts) & PTS_PROTO_CAPS_D)) )
+	{
+		DBG1(DBG_IMV, "PTS-IMC has not got TPM available,"
+					  "skipping Component Measurement phase");
+		handshake_state = IMV_ATTESTATION_STATE_END;
+	}
+
+	/* Switch on the attribute type IMV has received */
+	switch (handshake_state)
+	{
+		case IMV_ATTESTATION_STATE_INIT:
+		{
+			pts_proto_caps_flag_t flags;
+
+			/* Send Request Protocol Capabilities attribute */
+			flags = pts->get_proto_caps(pts);
+			attr = tcg_pts_attr_proto_caps_create(flags, TRUE);
+			attr->set_noskip_flag(attr, TRUE);
+			msg->add_attribute(msg, attr);
+
+			/* Send Measurement Algorithms attribute */
+			attr = tcg_pts_attr_meas_algo_create(supported_algorithms, FALSE);
+			attr->set_noskip_flag(attr, TRUE);
+			msg->add_attribute(msg, attr);
+
+			attestation_state->set_handshake_state(attestation_state,
+										IMV_ATTESTATION_STATE_NONCE_REQ);
+			break;
+		}
+		case IMV_ATTESTATION_STATE_NONCE_REQ:
+		{
+			int min_nonce_len;
+
+			/* Send DH nonce parameters request attribute */
+			min_nonce_len = lib->settings->get_int(lib->settings,
+						"libimcv.plugins.imv-attestation.min_nonce_len", 0);
+			attr = tcg_pts_attr_dh_nonce_params_req_create(min_nonce_len,
+													 supported_dh_groups);
+			attr->set_noskip_flag(attr, TRUE);
+			msg->add_attribute(msg, attr);
+
+			attestation_state->set_handshake_state(attestation_state,
+										IMV_ATTESTATION_STATE_TPM_INIT);
+			break;
+		}
+		case IMV_ATTESTATION_STATE_TPM_INIT:
+		{
+			pts_meas_algorithms_t selected_algorithm;
+			chunk_t initiator_value, initiator_nonce;
+
+			if ((pts->get_proto_caps(pts) & PTS_PROTO_CAPS_D))
+			{
+				/* Send DH nonce finish attribute */
+				selected_algorithm = pts->get_meas_algorithm(pts);
+				pts->get_my_public_value(pts, &initiator_value, &initiator_nonce);
+				attr = tcg_pts_attr_dh_nonce_finish_create(selected_algorithm,
+											initiator_value, initiator_nonce);
+				attr->set_noskip_flag(attr, TRUE);
+				msg->add_attribute(msg, attr);
+			}
+
+			/* Send Get TPM Version attribute */
+			attr = tcg_pts_attr_get_tpm_version_info_create();
+			attr->set_noskip_flag(attr, TRUE);
+			msg->add_attribute(msg, attr);
+
+			/* Send Get AIK attribute */
+			attr = tcg_pts_attr_get_aik_create();
+			attr->set_noskip_flag(attr, TRUE);
+			msg->add_attribute(msg, attr);
+
+			attestation_state->set_handshake_state(attestation_state,
+										IMV_ATTESTATION_STATE_MEAS);
+			break;
+		}
+		case IMV_ATTESTATION_STATE_MEAS:
+		{
+			enumerator_t *enumerator;
+			u_int32_t delimiter = SOLIDUS_UTF;
+			char *platform_info, *pathname;
+			u_int16_t request_id;
+			int id, type;
+			bool is_dir;
+
+			attestation_state->set_handshake_state(attestation_state,
+										IMV_ATTESTATION_STATE_COMP_EVID);
+
+			/* Get Platform and OS of the PTS-IMC */
+			platform_info = pts->get_platform_info(pts);
+
+			if (!pts_db || !platform_info)
+			{
+				DBG1(DBG_IMV, "%s%s%s not available",
+					(pts_db) ? "" : "pts database",
+					(!pts_db && !platform_info) ? "and" : "",
+					(platform_info) ? "" : "platform info");
+				break;
+			}
+			DBG1(DBG_IMV, "platform is '%s'", platform_info);
+
+			/* Send Request File Metadata attribute */
+			enumerator = pts_db->create_file_meta_enumerator(pts_db,
+															 platform_info);
+			if (!enumerator)
+			{
+				break;
+			}
+			while (enumerator->enumerate(enumerator, &type, &pathname))
+			{
+				is_dir = (type != 0);
+				DBG2(DBG_IMV, "metadata request for %s '%s'",
+					 is_dir ? "directory" : "file", pathname);
+				attr = tcg_pts_attr_req_file_meta_create(is_dir, delimiter,
+														 pathname);
+				attr->set_noskip_flag(attr, TRUE);
+				msg->add_attribute(msg, attr);
+			}
+			enumerator->destroy(enumerator);
+			
+			/* Send Request File Measurement attribute */
+			enumerator = pts_db->create_file_meas_enumerator(pts_db,
+															 platform_info);
+			if (!enumerator)
+			{
+				break;
+			}
+			while (enumerator->enumerate(enumerator, &id, &type, &pathname))
+			{
+				is_dir = (type != 0);
+				request_id = attestation_state->add_file_meas_request(
+							attestation_state, id, is_dir);
+				DBG2(DBG_IMV, "measurement request %d for %s '%s'",
+					 request_id, is_dir ? "directory" : "file", pathname);
+				attr = tcg_pts_attr_req_file_meas_create(is_dir, request_id,
+													 delimiter, pathname);
+				attr->set_noskip_flag(attr, TRUE);
+				msg->add_attribute(msg, attr);
+			}
+			enumerator->destroy(enumerator);
+			break;
+		}
+		case IMV_ATTESTATION_STATE_COMP_EVID:
+		{
+			tcg_pts_attr_req_func_comp_evid_t *attr_cast;
+			enumerator_t *enumerator;
+			char *platform_info;
+			pts_component_t *comp;
+			pts_comp_func_name_t *comp_name;
+			int vid, name, qualifier;
+			u_int8_t flags;
+			u_int32_t depth;
+			bool first = TRUE;
+
+			attestation_state->set_handshake_state(attestation_state,
+										IMV_ATTESTATION_STATE_END);
+
+			/* Get Platform and OS of the PTS-IMC */
+			platform_info = pts->get_platform_info(pts);
+			if (!pts_db || !platform_info)
+			{
+				DBG1(DBG_IMV, "%s%s%s not available",
+					(pts_db) ? "" : "pts database",
+					(!pts_db && !platform_info) ? "and" : "",
+					(platform_info) ? "" : "platform info");
+				break;
+			}
+			
+			enumerator = pts_db->create_comp_evid_enumerator(pts_db, platform_info);
+			if (!enumerator)
+			{
+				break;
+			}
+			DBG2(DBG_IMV, "evidence request by");
+			while (enumerator->enumerate(enumerator, &vid, &name,
+				&qualifier, &depth))
+			{
+				comp_name = pts_comp_func_name_create(vid, name, qualifier);
+				comp_name->log(comp_name, "  ");
+
+				comp = pts_components->create(pts_components, comp_name, depth);
+				if (!comp)
+				{
+					DBG2(DBG_IMV, "    not registered: removed from request");
+					comp_name->destroy(comp_name);
+					continue;
+				}
+				attestation_state->add_component(attestation_state, comp);
+				if (first)
+				{
+					attr = tcg_pts_attr_req_func_comp_evid_create();
+					attr->set_noskip_flag(attr, TRUE);
+					first = FALSE;
+				}
+				flags = comp->get_evidence_flags(comp);
+				/* TODO check flags against negotiated_caps */
+				attr_cast = (tcg_pts_attr_req_func_comp_evid_t *)attr;
+				attr_cast->add_component(attr_cast, flags, depth, comp_name);
+			}
+			enumerator->destroy(enumerator);
+
+			if (attr)
+			{
+				/* Send Request Functional Component Evidence attribute */
+				msg->add_attribute(msg, attr);
+
+				/* Send Generate Attestation Evidence attribute */
+				attr = tcg_pts_attr_gen_attest_evid_create();
+				attr->set_noskip_flag(attr, TRUE);
+				msg->add_attribute(msg, attr);
+			}
+			break;
+		}
+		default:
+			DBG1(DBG_IMV, "Attestation IMV is in unknown state: \"%s\"",
+				 handshake_state);
+			return FALSE;
+	}
+	return TRUE;
+}