path: root/src/libimcv/plugins/imv_os/imv_os.c

/*
 * Copyright (C) 2012-2013 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.
 */
#define _GNU_SOURCE
#include <stdio.h>

#include "imv_os_state.h"
#include "imv_os_database.h"

#include <imv/imv_agent.h>
#include <imv/imv_msg.h>
#include <ietf/ietf_attr.h>
#include <ietf/ietf_attr_attr_request.h>
#include <ietf/ietf_attr_default_pwd_enabled.h>
#include <ietf/ietf_attr_fwd_enabled.h>
#include <ietf/ietf_attr_installed_packages.h>
#include <ietf/ietf_attr_numeric_version.h>
#include <ietf/ietf_attr_op_status.h>
#include <ietf/ietf_attr_pa_tnc_error.h>
#include <ietf/ietf_attr_product_info.h>
#include <ietf/ietf_attr_remediation_instr.h>
#include <ietf/ietf_attr_string_version.h>
#include <ita/ita_attr.h>
#include <ita/ita_attr_get_settings.h>
#include <ita/ita_attr_settings.h>
#include <ita/ita_attr_angel.h>
#include <ita/ita_attr_device_id.h>

#include <tncif_names.h>
#include <tncif_pa_subtypes.h>

#include <pen/pen.h>
#include <collections/linked_list.h>
#include <utils/debug.h>
#include <utils/lexparser.h>

/* IMV definitions */

static const char imv_name[] = "OS";

static pen_type_t msg_types[] = {
	{ PEN_IETF, PA_SUBTYPE_IETF_OPERATING_SYSTEM }
};

static imv_agent_t *imv_os;

static char non_market_apps_str[] = "install_non_market_apps";

/**
 * Flag set when corresponding attribute has been received
 */
typedef enum imv_os_attr_t imv_os_attr_t;

enum imv_os_attr_t {
	IMV_OS_ATTR_PRODUCT_INFORMATION =         (1<<0),
	IMV_OS_ATTR_STRING_VERSION =              (1<<1),
	IMV_OS_ATTR_NUMERIC_VERSION =             (1<<2),
	IMV_OS_ATTR_OPERATIONAL_STATUS =          (1<<3),
	IMV_OS_ATTR_FORWARDING_ENABLED =          (1<<4),
	IMV_OS_ATTR_FACTORY_DEFAULT_PWD_ENABLED = (1<<5),
	IMV_OS_ATTR_DEVICE_ID =                   (1<<6),
	IMV_OS_ATTR_MUST =                        (1<<7)-1,
	IMV_OS_ATTR_INSTALLED_PACKAGES =          (1<<7),
	IMV_OS_ATTR_SETTINGS =                    (1<<8)
};

/**
 * IMV OS database
 */
static imv_os_database_t *os_db;

/*
 * 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)
{
	if (imv_os)
	{
		DBG1(DBG_IMV, "IMV \"%s\" has already been initialized", imv_name);
		return TNC_RESULT_ALREADY_INITIALIZED;
	}
	imv_os = imv_agent_create(imv_name, msg_types, countof(msg_types),
							  imv_id, actual_version);
	if (!imv_os)
	{
		return TNC_RESULT_FATAL;
	}
	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;
	}

	/* attach OS database co-located with IMV database */
	os_db = imv_os_database_create(imv_os->get_database(imv_os));

	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;
	imv_database_t *imv_db;
	int session_id;

	if (!imv_os)
	{
		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_os_state_create(connection_id);
			return imv_os->create_state(imv_os, state);
		case TNC_CONNECTION_STATE_DELETE:
			imv_db = imv_os->get_database(imv_os);
			if (imv_db && imv_os->get_state(imv_os, connection_id, &state))
			{
				session_id = state->get_session_id(state);
				imv_db->policy_script(imv_db, session_id, FALSE);
			}
			return imv_os->delete_state(imv_os, connection_id);
		default:
			return imv_os->change_state(imv_os, connection_id,
											 new_state, NULL);
	}
}

static TNC_Result receive_message(imv_state_t *state, imv_msg_t *in_msg)
{
	imv_msg_t *out_msg;
	imv_os_state_t *os_state;
	enumerator_t *enumerator;
	pa_tnc_attr_t *attr;
	pen_type_t type;
	TNC_Result result;
	chunk_t os_name = chunk_empty;
	chunk_t os_version = chunk_empty;
	bool fatal_error = FALSE, assessment = FALSE;

	os_state = (imv_os_state_t*)state;

	/* parse received PA-TNC message and handle local and remote errors */
	result = in_msg->receive(in_msg, &fatal_error);
	if (result != TNC_RESULT_SUCCESS)
	{
		return result;
	}

	out_msg = imv_msg_create_as_reply(in_msg);

	/* 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)
		{
			switch (type.type)
			{
				case IETF_ATTR_PRODUCT_INFORMATION:
				{
					ietf_attr_product_info_t *attr_cast;
					pen_t vendor_id;

					os_state->set_received(os_state,
										   IMV_OS_ATTR_PRODUCT_INFORMATION);
					attr_cast = (ietf_attr_product_info_t*)attr;
					os_name = attr_cast->get_info(attr_cast, &vendor_id, NULL);
					if (vendor_id != PEN_IETF)
					{
						DBG1(DBG_IMV, "operating system name is '%.*s' "
									  "from vendor %N", os_name.len, os_name.ptr,
									   pen_names, vendor_id);
					}
					else
					{
						DBG1(DBG_IMV, "operating system name is '%.*s'",
									   os_name.len, os_name.ptr);
					}
					break;
				}
				case IETF_ATTR_STRING_VERSION:
				{
					ietf_attr_string_version_t *attr_cast;

					os_state->set_received(os_state,
										   IMV_OS_ATTR_STRING_VERSION);
					attr_cast = (ietf_attr_string_version_t*)attr;
					os_version = attr_cast->get_version(attr_cast, NULL, NULL);
					if (os_version.len)
					{
						DBG1(DBG_IMV, "operating system version is '%.*s'",
									   os_version.len, os_version.ptr);
					}
					break;
				}
				case IETF_ATTR_NUMERIC_VERSION:
				{
					ietf_attr_numeric_version_t *attr_cast;
					u_int32_t major, minor;

					os_state->set_received(os_state,
										   IMV_OS_ATTR_NUMERIC_VERSION);
					attr_cast = (ietf_attr_numeric_version_t*)attr;
					attr_cast->get_version(attr_cast, &major, &minor);
					DBG1(DBG_IMV, "operating system numeric version is %d.%d",
								   major, minor);
					break;
				}
				case IETF_ATTR_OPERATIONAL_STATUS:
				{
					ietf_attr_op_status_t *attr_cast;
					op_status_t op_status;
					op_result_t op_result;
					time_t last_boot;

					os_state->set_received(os_state,
										   IMV_OS_ATTR_OPERATIONAL_STATUS);
					attr_cast = (ietf_attr_op_status_t*)attr;
					op_status = attr_cast->get_status(attr_cast);
					op_result = attr_cast->get_result(attr_cast);
					last_boot = attr_cast->get_last_use(attr_cast);
					DBG1(DBG_IMV, "operational status: %N, result: %N",
						 op_status_names, op_status, op_result_names, op_result);
					DBG1(DBG_IMV, "last boot: %T", &last_boot, TRUE);
					break;
				}
				case IETF_ATTR_FORWARDING_ENABLED:
				{
					ietf_attr_fwd_enabled_t *attr_cast;
					os_fwd_status_t fwd_status;

					os_state->set_received(os_state,
										   IMV_OS_ATTR_FORWARDING_ENABLED);
					attr_cast = (ietf_attr_fwd_enabled_t*)attr;
					fwd_status = attr_cast->get_status(attr_cast);
					DBG1(DBG_IMV, "IPv4 forwarding is %N",
								   os_fwd_status_names, fwd_status);
					if (fwd_status == OS_FWD_ENABLED)
					{
						os_state->set_os_settings(os_state,
											OS_SETTINGS_FWD_ENABLED);
					}
					break;
				}
				case IETF_ATTR_FACTORY_DEFAULT_PWD_ENABLED:
				{
					ietf_attr_default_pwd_enabled_t *attr_cast;
					bool default_pwd_status;

					os_state->set_received(os_state,
									IMV_OS_ATTR_FACTORY_DEFAULT_PWD_ENABLED);
					attr_cast = (ietf_attr_default_pwd_enabled_t*)attr;
					default_pwd_status = attr_cast->get_status(attr_cast);
					DBG1(DBG_IMV, "factory default password is %sabled",
								   default_pwd_status ? "en":"dis");
					if (default_pwd_status)
					{
						os_state->set_os_settings(os_state,
											OS_SETTINGS_DEFAULT_PWD_ENABLED);
					}
					break;
				}
				case IETF_ATTR_INSTALLED_PACKAGES:
				{
					ietf_attr_installed_packages_t *attr_cast;
					enumerator_t *e;
					status_t status;

					os_state->set_received(os_state,
									IMV_OS_ATTR_INSTALLED_PACKAGES);
					if (!os_db)
					{
						break;
					}
					attr_cast = (ietf_attr_installed_packages_t*)attr;

					e = attr_cast->create_enumerator(attr_cast);
					status = os_db->check_packages(os_db, os_state, e);
					e->destroy(e);

					if (status == FAILED)
					{
						state->set_recommendation(state,
								TNC_IMV_ACTION_RECOMMENDATION_NO_RECOMMENDATION,
								TNC_IMV_EVALUATION_RESULT_ERROR);
						assessment = TRUE;
					}
					break;
				}
				default:
					break;
			}
		}
		else if (type.vendor_id == PEN_ITA)
		{
			switch (type.type)
			{
				case ITA_ATTR_SETTINGS:
				{
					ita_attr_settings_t *attr_cast;
					enumerator_t *e;
					char *name;
					chunk_t value;

					os_state->set_received(os_state, IMV_OS_ATTR_SETTINGS);

					attr_cast = (ita_attr_settings_t*)attr;
					e = attr_cast->create_enumerator(attr_cast);
					while (e->enumerate(e, &name, &value))
					{
						if (streq(name, non_market_apps_str) &&
							chunk_equals(value, chunk_from_chars('1')))
						{
							os_state->set_os_settings(os_state,
												OS_SETTINGS_UNKNOWN_SOURCE);
						}
						DBG1(DBG_IMV, "setting '%s'\n  %.*s",
							 name, value.len, value.ptr);
					}
					e->destroy(e);
					break;
				}
				case ITA_ATTR_DEVICE_ID:
				{
					imv_database_t *imv_db;
					int session_id, device_id;
					chunk_t value;

					os_state->set_received(os_state, IMV_OS_ATTR_DEVICE_ID);

					value = attr->get_value(attr);
					DBG1(DBG_IMV, "device ID is %.*s", value.len, value.ptr);

					imv_db = imv_os->get_database(imv_os);
					if (imv_db)
					{
						session_id = state->get_session_id(state);
						device_id = imv_db->add_device(imv_db, session_id, value);
						os_state->set_device_id(os_state, device_id);
					}
					break;
				}
				case ITA_ATTR_START_ANGEL:
					os_state->set_angel_count(os_state, TRUE);
					break;
				case ITA_ATTR_STOP_ANGEL:
					os_state->set_angel_count(os_state, FALSE);
					break;
				default:
					break;
			}
		}
	}
	enumerator->destroy(enumerator);

	/**
	 * The IETF Product Information and String Version attributes
	 * are supposed to arrive in the same PA-TNC message
	 */
	if (os_name.len && os_version.len)
	{
		os_type_t os_type;
		imv_database_t *imv_db;

		/* set the OS type, name and version */
		os_type = os_type_from_name(os_name);
		os_state->set_info(os_state,os_type, os_name, os_version);

		imv_db = imv_os->get_database(imv_os);
		if (imv_db)
		{
			imv_db->add_product(imv_db, state->get_session_id(state),
					os_state->get_info(os_state, NULL, NULL, NULL));
		}
	}

	if (fatal_error)
	{
		state->set_recommendation(state,
								TNC_IMV_ACTION_RECOMMENDATION_NO_RECOMMENDATION,
								TNC_IMV_EVALUATION_RESULT_ERROR);
		assessment = TRUE;
	}

	if (assessment)
	{
		result = out_msg->send_assessment(out_msg);
		out_msg->destroy(out_msg);
		if (result != TNC_RESULT_SUCCESS)
		{
			return result;
		}  
		return imv_os->provide_recommendation(imv_os, state);
	}

	/* send PA-TNC message with 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-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)
{
	imv_state_t *state;
	imv_msg_t *in_msg;
	TNC_Result result;

	if (!imv_os)
	{
		DBG1(DBG_IMV, "IMV \"%s\" has not been initialized", imv_name);
		return TNC_RESULT_NOT_INITIALIZED;
	}
	if (!imv_os->get_state(imv_os, connection_id, &state))
	{
		return TNC_RESULT_FATAL;
	}
	in_msg = imv_msg_create_from_data(imv_os, 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_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)
{
	imv_state_t *state;
	imv_msg_t *in_msg;
	TNC_Result result;

	if (!imv_os)
	{
		DBG1(DBG_IMV, "IMV \"%s\" has not been initialized", imv_name);
		return TNC_RESULT_NOT_INITIALIZED;
	}
	if (!imv_os->get_state(imv_os, connection_id, &state))
	{
		return TNC_RESULT_FATAL;
	}
	in_msg = imv_msg_create_from_long_data(imv_os, state, connection_id,
								src_imc_id, dst_imv_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-IMV Specification 1.3
 */
TNC_Result TNC_IMV_SolicitRecommendation(TNC_IMVID imv_id,
										 TNC_ConnectionID connection_id)
{
	imv_state_t *state;

	if (!imv_os)
	{
		DBG1(DBG_IMV, "IMV \"%s\" has not been initialized", imv_name);
		return TNC_RESULT_NOT_INITIALIZED;
	}
	if (!imv_os->get_state(imv_os, connection_id, &state))
	{
		return TNC_RESULT_FATAL;
	}
	return imv_os->provide_recommendation(imv_os, state);
}

/**
 * Build an IETF Attribute Request attribute for missing attributes
 */
static pa_tnc_attr_t* build_attr_request(u_int received)
{
	pa_tnc_attr_t *attr;
	ietf_attr_attr_request_t *attr_cast;

	attr = ietf_attr_attr_request_create(PEN_RESERVED, 0);
	attr_cast = (ietf_attr_attr_request_t*)attr;

	if (!(received & IMV_OS_ATTR_PRODUCT_INFORMATION) ||
		!(received & IMV_OS_ATTR_STRING_VERSION))
	{
		attr_cast->add(attr_cast, PEN_IETF, IETF_ATTR_PRODUCT_INFORMATION);
		attr_cast->add(attr_cast, PEN_IETF, IETF_ATTR_STRING_VERSION);
	}
	if (!(received & IMV_OS_ATTR_NUMERIC_VERSION))
	{
		attr_cast->add(attr_cast, PEN_IETF, IETF_ATTR_NUMERIC_VERSION);
	}
	if (!(received & IMV_OS_ATTR_OPERATIONAL_STATUS))
	{
		attr_cast->add(attr_cast, PEN_IETF, IETF_ATTR_OPERATIONAL_STATUS);
	}
	if (!(received & IMV_OS_ATTR_FORWARDING_ENABLED))
	{
		attr_cast->add(attr_cast, PEN_IETF, IETF_ATTR_FORWARDING_ENABLED);
	}
	if (!(received & IMV_OS_ATTR_FACTORY_DEFAULT_PWD_ENABLED))
	{
		attr_cast->add(attr_cast, PEN_IETF,
								  IETF_ATTR_FACTORY_DEFAULT_PWD_ENABLED);
	}
	if (!(received & IMV_OS_ATTR_DEVICE_ID))
	{
		attr_cast->add(attr_cast, PEN_ITA,  ITA_ATTR_DEVICE_ID);
	}

	return attr;
}

/**
 * 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_msg_t *out_msg;
	imv_state_t *state;
	imv_database_t *imv_db;
	imv_workitem_t *workitem;
	imv_os_state_t *os_state;
	imv_os_handshake_state_t handshake_state;
	pa_tnc_attr_t *attr;
	TNC_Result result = TNC_RESULT_SUCCESS;
	enumerator_t *enumerator;
	u_int received;
	char *result_str;
	bool fail;

	if (!imv_os)
	{
		DBG1(DBG_IMV, "IMV \"%s\" has not been initialized", imv_name);
		return TNC_RESULT_NOT_INITIALIZED;
	}
	imv_db = imv_os->get_database(imv_os);

	if (!imv_os->get_state(imv_os, connection_id, &state))
	{
		return TNC_RESULT_FATAL;
	}
	os_state = (imv_os_state_t*)state;
	handshake_state = os_state->get_handshake_state(os_state);
	received = os_state->get_received(os_state);

	/* create an empty out message - we might need it */
	out_msg = imv_msg_create(imv_os, state, connection_id, imv_id,
							 TNC_IMCID_ANY, msg_types[0]);

	if (handshake_state == IMV_OS_STATE_INIT)
	{
		if ((received & IMV_OS_ATTR_MUST) != IMV_OS_ATTR_MUST)
		{
			/* create attribute request for missing mandatory attributes */
			out_msg->add_attribute(out_msg, build_attr_request(received));
		}
	}

	if (handshake_state < IMV_OS_STATE_POLICY_START)
	{
		if (((received & IMV_OS_ATTR_PRODUCT_INFORMATION) &&
			 (received & IMV_OS_ATTR_STRING_VERSION)) &&
			((received & IMV_OS_ATTR_DEVICE_ID) ||
			 (handshake_state == IMV_OS_STATE_ATTR_REQ)))
		{
			if (imv_db)
			{
				/* trigger the policy manager */
				imv_db->policy_script(imv_db, state->get_session_id(state), TRUE);
			}
			handshake_state = IMV_OS_STATE_POLICY_START;
		}
		else if (handshake_state == IMV_OS_STATE_ATTR_REQ)
		{
			/**
			 * both the IETF Product Information and IETF String Version
			 * attribute should have been present
			 */
			state->set_recommendation(state,
								TNC_IMV_ACTION_RECOMMENDATION_NO_RECOMMENDATION,
								TNC_IMV_EVALUATION_RESULT_ERROR);

			/* send assessment */
			result = out_msg->send_assessment(out_msg);
			out_msg->destroy(out_msg);

			if (result != TNC_RESULT_SUCCESS)
			{
				return result;
			}  
			return imv_os->provide_recommendation(imv_os, state);
		}
		else
		{
			handshake_state = IMV_OS_STATE_ATTR_REQ;
		}
		os_state->set_handshake_state(os_state, handshake_state);
	}

	if (handshake_state == IMV_OS_STATE_POLICY_START)
	{
		if (imv_db)
		{
			enumerator = imv_db->create_workitem_enumerator(imv_db,
									state->get_session_id(state));
			if (!enumerator)
			{
				return TNC_RESULT_SUCCESS;
			}
			while (enumerator->enumerate(enumerator, &workitem))
			{
				switch (workitem->get_type(workitem))
				{
					case IMV_WORKITEM_PACKAGES:
						attr = ietf_attr_attr_request_create(PEN_IETF,
										IETF_ATTR_INSTALLED_PACKAGES);
						out_msg->add_attribute(out_msg, attr);
						state->add_workitem(state, workitem);
						break;
					case IMV_WORKITEM_UNKNOWN_SOURCE:
						attr = ita_attr_get_settings_create(non_market_apps_str);
						out_msg->add_attribute(out_msg, attr);
						state->add_workitem(state, workitem);
						break;
					case IMV_WORKITEM_FORWARDING:
					case IMV_WORKITEM_DEFAULT_PWD:
						state->add_workitem(state, workitem);
						break;
					case IMV_WORKITEM_START:
						handshake_state = IMV_OS_STATE_WORKITEMS;
						/* fall through to default */
					default:
						workitem->destroy(workitem);
				}
			}
			enumerator->destroy(enumerator);
		}
		else
		{
			/* TODO: define workitems without DB access */
			handshake_state = IMV_OS_STATE_WORKITEMS;
		}
		os_state->set_handshake_state(os_state, handshake_state);
	}

	if (handshake_state == IMV_OS_STATE_WORKITEMS)
	{
		enumerator = state->create_workitem_enumerator(state);
		while (enumerator->enumerate(enumerator, &workitem))
		{
			switch (workitem->get_type(workitem))
			{
				case IMV_WORKITEM_PACKAGES:
				{
					int count, count_update, count_blacklist, count_ok, ret;

					if (!(received & IMV_OS_ATTR_INSTALLED_PACKAGES) ||
						os_state->get_angel_count(os_state))
					{
						break;
					}
					os_state->get_count(os_state, &count, &count_update,
										&count_blacklist, &count_ok);
					fail = count_update || count_blacklist;
					ret = asprintf(&result_str, "processed %d packages: "
							"%d not updated, %d blacklisted, %d ok, "
							"%d not found",
							count, count_update, count_blacklist, count_ok,
							count - count_update - count_blacklist - count_ok);
					if (ret == -1)
					{
						result_str = strdup("");
					}

					state->finalize_workitem(state, enumerator, workitem,
								result_str, fail ?
								TNC_IMV_EVALUATION_RESULT_NONCOMPLIANT_MINOR :
								TNC_IMV_EVALUATION_RESULT_COMPLIANT);
					free(result_str);
					break;
				}
				case IMV_WORKITEM_UNKNOWN_SOURCE:
					if (!(received & IMV_OS_ATTR_SETTINGS))
					{
						break;
					}
					fail = os_state->get_os_settings(os_state) &
								OS_SETTINGS_UNKNOWN_SOURCE;
					result_str = fail ? "unknown sources enabled" : "";

					state->finalize_workitem(state, enumerator, workitem,
								result_str, fail ?
								TNC_IMV_EVALUATION_RESULT_NONCOMPLIANT_MINOR :
								TNC_IMV_EVALUATION_RESULT_COMPLIANT);
					break;					
				case IMV_WORKITEM_FORWARDING:
					if (!(received & IMV_OS_ATTR_FORWARDING_ENABLED))
					{
						break;
					}
					fail = os_state->get_os_settings(os_state) &
								OS_SETTINGS_FWD_ENABLED;
					result_str = fail ? "forwarding enabled" : "";

					state->finalize_workitem(state, enumerator, workitem,
								result_str, fail ?
								TNC_IMV_EVALUATION_RESULT_NONCOMPLIANT_MINOR :
								TNC_IMV_EVALUATION_RESULT_COMPLIANT);
					break;
				case IMV_WORKITEM_DEFAULT_PWD:
					if (!(received & IMV_OS_ATTR_FACTORY_DEFAULT_PWD_ENABLED))
					{
						break;
					}
					fail = os_state->get_os_settings(os_state) &
								OS_SETTINGS_DEFAULT_PWD_ENABLED;
					result_str = fail ? "default password enabled" : "";

					state->finalize_workitem(state, enumerator, workitem,
								result_str, fail ?
								TNC_IMV_EVALUATION_RESULT_NONCOMPLIANT_MAJOR :
								TNC_IMV_EVALUATION_RESULT_COMPLIANT);
					break;
				default:
					break;
			}
		}
		enumerator->destroy(enumerator);

		/* finalized all workitems ? */
		if (state->get_workitem_count(state) == 0)
		{
			result = out_msg->send_assessment(out_msg);
			out_msg->destroy(out_msg);
			if (result != TNC_RESULT_SUCCESS)
			{
				return result;
			}
			return imv_os->provide_recommendation(imv_os, state);
		}		
	}

	/* send non-empty PA-TNC message with excl flag not set */
	if (out_msg->get_attribute_count(out_msg))
	{
		result = out_msg->send(out_msg, FALSE);
	}
	out_msg->destroy(out_msg);

	return result;
}

/**
 * see section 3.8.9 of TCG TNC IF-IMV Specification 1.3
 */
TNC_Result TNC_IMV_Terminate(TNC_IMVID imv_id)
{
	if (!imv_os)
	{
		DBG1(DBG_IMV, "IMV \"%s\" has not been initialized", imv_name);
		return TNC_RESULT_NOT_INITIALIZED;
	}
	DESTROY_IF(os_db);
	os_db = NULL;

	imv_os->destroy(imv_os);
	imv_os = 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_os)
	{
		DBG1(DBG_IMV, "IMV \"%s\" has not been initialized", imv_name);
		return TNC_RESULT_NOT_INITIALIZED;
	}
	return imv_os->bind_functions(imv_os, bind_function);
}