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/*
* Copyright (C) 2011 Sansar Choinyambuu, 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 "pts/components/pts_comp_evidence.h"
#include <debug.h>
typedef struct private_pts_comp_evidence_t private_pts_comp_evidence_t;
/**
* Private data of a pts_comp_evidence_t object.
*/
struct private_pts_comp_evidence_t {
/**
* Public pts_comp_evidence_t interface.
*/
pts_comp_evidence_t public;
/**
* Component Functional Name
*/
pts_comp_func_name_t *name;
/**
* Sub-Component Depth
*/
u_int32_t depth;
/**
* Measurement Time
*/
time_t measurement_time;
/**
* Measurement Time
*/
chunk_t measurement;
/**
* Measurement Hash Algorithm
*/
pts_meas_algorithms_t hash_algorithm;
/**
* Is PCR Information included?
*/
bool has_pcr_info;
/**
* PCR the measurement was extended into
*/
u_int32_t extended_pcr;
/**
* PCR value before extension
*/
chunk_t pcr_before;
/**
* PCR value after extension
*/
chunk_t pcr_after;
/**
* Transformation used for extending measurement into PCR
*/
pts_pcr_transform_t transform;
/**
* Component Validation Result
*/
pts_comp_evid_validation_t validation;
/**
* Verification Policy URI
*/
chunk_t policy_uri;
};
METHOD(pts_comp_evidence_t, get_comp_func_name, pts_comp_func_name_t*,
private_pts_comp_evidence_t *this, u_int32_t *depth)
{
if (depth)
{
*depth = this->depth;
}
return this->name;
}
METHOD(pts_comp_evidence_t, get_extended_pcr, u_int32_t,
private_pts_comp_evidence_t *this)
{
return this->extended_pcr;
}
METHOD(pts_comp_evidence_t, get_measurement, chunk_t,
private_pts_comp_evidence_t *this, u_int32_t *extended_pcr,
pts_meas_algorithms_t *algo, pts_pcr_transform_t *transform,
time_t *measurement_time)
{
if (extended_pcr)
{
*extended_pcr = this->extended_pcr;
}
if (algo)
{
*algo = this->hash_algorithm;
}
if (transform)
{
*transform = this->transform;
}
if (measurement_time)
{
*measurement_time = this->measurement_time;
}
return this->measurement;
}
METHOD(pts_comp_evidence_t, get_pcr_info, bool,
private_pts_comp_evidence_t *this, chunk_t *pcr_before, chunk_t *pcr_after)
{
if (pcr_before)
{
*pcr_before = this->pcr_before;
}
if (pcr_after)
{
*pcr_after = this->pcr_after;
}
return this->has_pcr_info;
}
METHOD(pts_comp_evidence_t, set_pcr_info, void,
private_pts_comp_evidence_t *this, chunk_t pcr_before, chunk_t pcr_after)
{
this->has_pcr_info = TRUE;
this->pcr_before = pcr_before;
this->pcr_after = pcr_after;
DBG2(DBG_PTS, "PCR %2d before value : %#B", this->extended_pcr, &pcr_before);
DBG2(DBG_PTS, "PCR %2d after value : %#B", this->extended_pcr, &pcr_after);
}
METHOD(pts_comp_evidence_t, get_validation, pts_comp_evid_validation_t,
private_pts_comp_evidence_t *this, chunk_t *uri)
{
if (uri)
{
*uri = this->policy_uri;
}
return this->validation;
}
METHOD(pts_comp_evidence_t, set_validation, void,
private_pts_comp_evidence_t *this, pts_comp_evid_validation_t validation,
chunk_t uri)
{
this->validation = validation;
this->policy_uri = chunk_clone(uri);
}
METHOD(pts_comp_evidence_t, destroy, void,
private_pts_comp_evidence_t *this)
{
this->name->destroy(this->name);
free(this->measurement.ptr);
free(this->pcr_before.ptr);
free(this->pcr_after.ptr);
free(this->policy_uri.ptr);
free(this);
}
/**
* See header
*/
pts_comp_evidence_t *pts_comp_evidence_create(pts_comp_func_name_t *name,
u_int32_t depth,
u_int32_t extended_pcr,
pts_meas_algorithms_t algo,
pts_pcr_transform_t transform,
time_t measurement_time,
chunk_t measurement)
{
private_pts_comp_evidence_t *this;
INIT(this,
.public = {
.get_comp_func_name = _get_comp_func_name,
.get_extended_pcr = _get_extended_pcr,
.get_measurement = _get_measurement,
.get_pcr_info = _get_pcr_info,
.set_pcr_info = _set_pcr_info,
.get_validation = _get_validation,
.set_validation = _set_validation,
.destroy = _destroy,
},
.name = name,
.depth = depth,
.extended_pcr = extended_pcr,
.hash_algorithm = algo,
.transform = transform,
.measurement_time = measurement_time,
.measurement = measurement,
);
name->log(name, "");
DBG2(DBG_PTS, "measurement time: %T", &measurement_time, FALSE);
DBG2(DBG_PTS, "PCR %2d extended with: %#B", extended_pcr, &measurement);
return &this->public;
}
/**
* See header
*/
pts_pcr_transform_t pts_meas_algo_to_pcr_transform(pts_meas_algorithms_t algo,
size_t pcr_len)
{
size_t hash_size;
hash_size = pts_meas_algo_hash_size(algo);
if (hash_size == 0)
{
return PTS_PCR_TRANSFORM_NO;
}
if (hash_size == pcr_len)
{
return PTS_PCR_TRANSFORM_MATCH;
}
if (hash_size > pcr_len)
{
return PTS_PCR_TRANSFORM_LONG;
}
return PTS_PCR_TRANSFORM_SHORT;
}
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