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strongswan/src/libimcv/plugins/imc_os/imc_os.c

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/*
* Copyright (C) 2011-2012 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_os_state.h"
#include <imc/imc_agent.h>
#include <pa_tnc/pa_tnc_msg.h>
#include <ietf/ietf_attr.h>
#include <ietf/ietf_attr_assess_result.h>
#include <ietf/ietf_attr_attr_request.h>
#include <ietf/ietf_attr_installed_packages.h>
#include <ietf/ietf_attr_pa_tnc_error.h>
#include <ietf/ietf_attr_product_info.h>
#include <ietf/ietf_attr_string_version.h>
#include <tncif_pa_subtypes.h>
#include <pen/pen.h>
#include <debug.h>
#include <stdio.h>
/* IMC definitions */
static const char imc_name[] = "OS";
#define IMC_VENDOR_ID PEN_IETF
#define IMC_SUBTYPE PA_SUBTYPE_IETF_OPERATING_SYSTEM
static imc_agent_t *imc_os;
/**
* see section 3.8.1 of TCG TNC IF-IMC Specification 1.3
*/
TNC_Result TNC_IMC_Initialize(TNC_IMCID imc_id,
TNC_Version min_version,
TNC_Version max_version,
TNC_Version *actual_version)
{
if (imc_os)
{
DBG1(DBG_IMC, "IMC \"%s\" has already been initialized", imc_name);
return TNC_RESULT_ALREADY_INITIALIZED;
}
imc_os = imc_agent_create(imc_name, IMC_VENDOR_ID, IMC_SUBTYPE,
imc_id, actual_version);
if (!imc_os)
{
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_NotifyConnectionChange(TNC_IMCID imc_id,
TNC_ConnectionID connection_id,
TNC_ConnectionState new_state)
{
imc_state_t *state;
if (!imc_os)
{
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_os_state_create(connection_id);
return imc_os->create_state(imc_os, state);
case TNC_CONNECTION_STATE_HANDSHAKE:
if (imc_os->change_state(imc_os, 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_os->delete_state(imc_os, connection_id);
default:
return imc_os->change_state(imc_os, connection_id,
new_state, NULL);
}
}
/**
* Add IETF Product Information attribute to the send queue
*/
static void add_product_info(linked_list_t *attr_list)
{
pa_tnc_attr_t *attr;
char *os_name = "Ubuntu";
attr = ietf_attr_product_info_create(PEN_IETF, 0, os_name);
attr_list->insert_last(attr_list, attr);
}
/**
* Add IETF String Version attribute to the send queue
*/
static void add_string_version(linked_list_t *attr_list)
{
pa_tnc_attr_t *attr;
chunk_t os_version = { "12.04", 5};
attr = ietf_attr_string_version_create(os_version, chunk_empty, chunk_empty);
attr_list->insert_last(attr_list, attr);
}
/**
* Add an IETF Installed Packages attribute to the send queue
*/
static void add_installed_packages(linked_list_t *attr_list)
{
pa_tnc_attr_t *attr;
ietf_attr_installed_packages_t *attr_cast;
chunk_t libc_name = { "libc-bin", 8 };
chunk_t libc_version = { "2.15-0ubuntu10.2", 16 };
chunk_t selinux_name = { "selinux", 7 };
chunk_t selinux_version = { "1:0.11", 6 };
attr = ietf_attr_installed_packages_create();
attr_cast = (ietf_attr_installed_packages_t*)attr;
attr_cast->add(attr_cast, libc_name, libc_version);
attr_cast->add(attr_cast, selinux_name, selinux_version);
attr_list->insert_last(attr_list, attr);
}
/**
* see section 3.8.3 of TCG TNC IF-IMC Specification 1.3
*/
TNC_Result TNC_IMC_BeginHandshake(TNC_IMCID imc_id,
TNC_ConnectionID connection_id)
{
TNC_Result result = TNC_RESULT_SUCCESS;
if (!imc_os)
{
DBG1(DBG_IMC, "IMC \"%s\" has not been initialized", imc_name);
return TNC_RESULT_NOT_INITIALIZED;
}
if (lib->settings->get_bool(lib->settings,
"libimcv.plugins.imc-os.send_info", TRUE))
{
linked_list_t *attr_list;
attr_list = linked_list_create();
add_product_info(attr_list);
add_string_version(attr_list);
result = imc_os->send_message(imc_os, connection_id, FALSE, 0,
TNC_IMVID_ANY, attr_list);
attr_list->destroy(attr_list);
}
return result;
}
static TNC_Result receive_message(TNC_IMCID imc_id,
TNC_ConnectionID connection_id,
TNC_UInt32 msg_flags,
chunk_t msg,
TNC_VendorID msg_vid,
TNC_MessageSubtype msg_subtype,
TNC_UInt32 src_imv_id,
TNC_UInt32 dst_imc_id)
{
pa_tnc_msg_t *pa_tnc_msg;
pa_tnc_attr_t *attr;
pen_type_t attr_type;
linked_list_t *attr_list;
imc_state_t *state;
enumerator_t *enumerator;
TNC_Result result;
TNC_UInt32 target_imc_id;
bool fatal_error;
if (!imc_os)
{
DBG1(DBG_IMC, "IMC \"%s\" has not been initialized", imc_name);
return TNC_RESULT_NOT_INITIALIZED;
}
/* get current IMC state */
if (!imc_os->get_state(imc_os, connection_id, &state))
{
return TNC_RESULT_FATAL;
}
/* parse received PA-TNC message and automatically handle any errors */
result = imc_os->receive_message(imc_os, state, msg, msg_vid,
msg_subtype, src_imv_id, dst_imc_id, &pa_tnc_msg);
/* no parsed PA-TNC attributes available if an error occurred */
if (!pa_tnc_msg)
{
return result;
}
target_imc_id = (dst_imc_id == TNC_IMCID_ANY) ? imc_id : dst_imc_id;
/* preprocess any IETF standard error attributes */
fatal_error = pa_tnc_msg->process_ietf_std_errors(pa_tnc_msg);
/* analyze PA-TNC attributes */
attr_list = linked_list_create();
enumerator = pa_tnc_msg->create_attribute_enumerator(pa_tnc_msg);
while (enumerator->enumerate(enumerator, &attr))
{
attr_type = attr->get_type(attr);
if (attr_type.vendor_id != PEN_IETF)
{
continue;
}
if (attr_type.type == IETF_ATTR_ATTRIBUTE_REQUEST)
{
ietf_attr_attr_request_t *attr_cast;
pen_type_t *entry;
enumerator_t *e;
attr_cast = (ietf_attr_attr_request_t*)attr;
e = attr_cast->create_enumerator(attr_cast);
while (e->enumerate(e, &entry))
{
if (entry->vendor_id != PEN_IETF)
{
continue;
}
switch (entry->type)
{
case IETF_ATTR_PRODUCT_INFORMATION:
add_product_info(attr_list);
break;
case IETF_ATTR_STRING_VERSION:
add_string_version(attr_list);
break;
case IETF_ATTR_INSTALLED_PACKAGES:
add_installed_packages(attr_list);
break;
default:
break;
}
}
e->destroy(e);
}
else if (attr_type.type == IETF_ATTR_ASSESSMENT_RESULT)
{
ietf_attr_assess_result_t *attr_cast;
attr_cast = (ietf_attr_assess_result_t*)attr;
state->set_result(state, target_imc_id,
attr_cast->get_result(attr_cast));
}
}
enumerator->destroy(enumerator);
pa_tnc_msg->destroy(pa_tnc_msg);
if (fatal_error)
{
attr_list->destroy_offset(attr_list, offsetof(pa_tnc_attr_t, destroy));
return TNC_RESULT_FATAL;
}
if (attr_list->get_count(attr_list))
{
result = imc_os->send_message(imc_os, connection_id, TRUE, imc_id,
src_imv_id, attr_list);
}
else
{
result = TNC_RESULT_SUCCESS;
}
attr_list->destroy(attr_list);
return result;
}
/**
* see section 3.8.4 of TCG TNC IF-IMC Specification 1.3
*/
TNC_Result TNC_IMC_ReceiveMessage(TNC_IMCID imc_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(imc_id, connection_id, 0, chunk_create(msg, msg_len),
msg_vid, msg_subtype, 0, TNC_IMCID_ANY);
}
/**
* see section 3.8.6 of TCG TNC IF-IMV Specification 1.3
*/
TNC_Result 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)
{
return receive_message(imc_id, connection_id, msg_flags,
chunk_create(msg, msg_len), msg_vid, msg_subtype,
src_imv_id, dst_imc_id);
}
/**
* see section 3.8.7 of TCG TNC IF-IMC Specification 1.3
*/
TNC_Result TNC_IMC_BatchEnding(TNC_IMCID imc_id,
TNC_ConnectionID connection_id)
{
if (!imc_os)
{
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_Terminate(TNC_IMCID imc_id)
{
if (!imc_os)
{
DBG1(DBG_IMC, "IMC \"%s\" has not been initialized", imc_name);
return TNC_RESULT_NOT_INITIALIZED;
}
imc_os->destroy(imc_os);
imc_os = NULL;
return TNC_RESULT_SUCCESS;
}
/**
* see section 4.2.8.1 of TCG TNC IF-IMC Specification 1.3
*/
TNC_Result TNC_IMC_ProvideBindFunction(TNC_IMCID imc_id,
TNC_TNCC_BindFunctionPointer bind_function)
{
if (!imc_os)
{
DBG1(DBG_IMC, "IMC \"%s\" has not been initialized", imc_name);
return TNC_RESULT_NOT_INITIALIZED;
}
return imc_os->bind_functions(imc_os, bind_function);
}
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