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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 "ita_comp_tgrub.h"
#include "ita_comp_func_name.h"
#include "pts/components/pts_component.h"
#include <utils/debug.h>
#include <pen/pen.h>
typedef struct pts_ita_comp_tgrub_t pts_ita_comp_tgrub_t;
/**
* Private data of a pts_ita_comp_tgrub_t object.
*
*/
struct pts_ita_comp_tgrub_t {
/**
* Public pts_component_t interface.
*/
pts_component_t public;
/**
* Component Functional Name
*/
pts_comp_func_name_t *name;
/**
* Sub-component depth
*/
uint32_t depth;
/**
* PTS measurement database
*/
pts_database_t *pts_db;
/**
* Reference count
*/
refcount_t ref;
};
METHOD(pts_component_t, get_comp_func_name, pts_comp_func_name_t*,
pts_ita_comp_tgrub_t *this)
{
return this->name;
}
METHOD(pts_component_t, get_evidence_flags, uint8_t,
pts_ita_comp_tgrub_t *this)
{
return PTS_REQ_FUNC_COMP_EVID_PCR;
}
METHOD(pts_component_t, get_depth, uint32_t,
pts_ita_comp_tgrub_t *this)
{
return this->depth;
}
METHOD(pts_component_t, measure, status_t,
pts_ita_comp_tgrub_t *this, uint8_t qualifier, pts_t *pts,
pts_comp_evidence_t **evidence)
{
size_t pcr_len;
pts_pcr_transform_t pcr_transform;
pts_meas_algorithms_t hash_algo;
pts_comp_evidence_t *evid;
uint32_t extended_pcr;
time_t measurement_time;
chunk_t measurement, pcr_before, pcr_after;
/* Provisional implementation for TGRUB */
extended_pcr = PCR_DEBUG;
time(&measurement_time);
if (!pts->read_pcr(pts, extended_pcr, &pcr_after))
{
DBG1(DBG_PTS, "error occurred while reading PCR: %d", extended_pcr);
return FAILED;
}
hash_algo = PTS_MEAS_ALGO_SHA1;
pcr_len = HASH_SIZE_SHA1;
pcr_transform = pts_meas_algo_to_pcr_transform(hash_algo, pcr_len);
measurement = chunk_alloc(pcr_len);
memset(measurement.ptr, 0x00, measurement.len);
pcr_before = chunk_alloc(pcr_len);
memset(pcr_before.ptr, 0x00, pcr_before.len);
evid = *evidence = pts_comp_evidence_create(this->name->clone(this->name),
this->depth, extended_pcr,
hash_algo, pcr_transform,
measurement_time, measurement);
evid->set_pcr_info(evid, pcr_before, pcr_after);
return SUCCESS;
}
METHOD(pts_component_t, verify, status_t,
pts_ita_comp_tgrub_t *this, uint8_t qualifier, pts_t *pts,
pts_comp_evidence_t *evidence)
{
bool has_pcr_info;
uint32_t extended_pcr;
pts_meas_algorithms_t algo;
pts_pcr_transform_t transform;
pts_pcr_t *pcrs;
time_t measurement_time;
chunk_t pcr_before, pcr_after;
chunk_t measurement __attribute__((unused));
pcrs = pts->get_pcrs(pts);
measurement = evidence->get_measurement(evidence, &extended_pcr,
&algo, &transform, &measurement_time);
if (extended_pcr != PCR_DEBUG)
{
return FAILED;
}
/* TODO check measurement in database */
has_pcr_info = evidence->get_pcr_info(evidence, &pcr_before, &pcr_after);
if (has_pcr_info)
{
if (!chunk_equals_const(pcr_before, pcrs->get(pcrs, extended_pcr)))
{
DBG1(DBG_PTS, "PCR %2u: pcr_before is not equal to pcr value");
}
if (pcrs->set(pcrs, extended_pcr, pcr_after))
{
return SUCCESS;
}
}
return SUCCESS;
}
METHOD(pts_component_t, finalize, bool,
pts_ita_comp_tgrub_t *this, uint8_t qualifier, bio_writer_t *result)
{
return FALSE;
}
METHOD(pts_component_t, get_ref, pts_component_t*,
pts_ita_comp_tgrub_t *this)
{
ref_get(&this->ref);
return &this->public;
}
METHOD(pts_component_t, destroy, void,
pts_ita_comp_tgrub_t *this)
{
if (ref_put(&this->ref))
{
this->name->destroy(this->name);
free(this);
}
}
/**
* See header
*/
pts_component_t *pts_ita_comp_tgrub_create(uint32_t depth,
pts_database_t *pts_db)
{
pts_ita_comp_tgrub_t *this;
INIT(this,
.public = {
.get_comp_func_name = _get_comp_func_name,
.get_evidence_flags = _get_evidence_flags,
.get_depth = _get_depth,
.measure = _measure,
.verify = _verify,
.finalize = _finalize,
.get_ref = _get_ref,
.destroy = _destroy,
},
.name = pts_comp_func_name_create(PEN_ITA, PTS_ITA_COMP_FUNC_NAME_TGRUB,
PTS_ITA_QUALIFIER_FLAG_KERNEL |
PTS_ITA_QUALIFIER_TYPE_TRUSTED),
.depth = depth,
.pts_db = pts_db,
.ref = 1,
);
return &this->public;
}
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