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/*
* Copyright (C) 2011 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_tboot.h"
#include "ita_comp_func_name.h"
#include "libpts.h"
#include "pts/components/pts_component.h"
#include <debug.h>
#include <pen/pen.h>
typedef struct pts_ita_comp_tboot_t pts_ita_comp_tboot_t;
/**
* Private data of a pts_ita_comp_tboot_t object.
*
*/
struct pts_ita_comp_tboot_t {
/**
* Public pts_component_t interface.
*/
pts_component_t public;
/**
* Component Functional Name
*/
pts_comp_func_name_t *name;
/**
* Sub-component depth
*/
u_int32_t depth;
/**
* AIK keyid
*/
chunk_t keyid;
/**
* Time of TBOOT measurement
*/
time_t measurement_time;
/**
* Expected measurement count
*/
int count;
/**
* Measurement sequence number
*/
int seq_no;
};
METHOD(pts_component_t, get_comp_func_name, pts_comp_func_name_t*,
pts_ita_comp_tboot_t *this)
{
return this->name;
}
METHOD(pts_component_t, get_evidence_flags, u_int8_t,
pts_ita_comp_tboot_t *this)
{
return PTS_REQ_FUNC_COMP_EVID_PCR;
}
METHOD(pts_component_t, get_depth, u_int32_t,
pts_ita_comp_tboot_t *this)
{
return this->depth;
}
METHOD(pts_component_t, measure, status_t,
pts_ita_comp_tboot_t *this, pts_t *pts, pts_comp_evidence_t **evidence)
{
pts_comp_evidence_t *evid;
char *meas_hex, *pcr_before_hex, *pcr_after_hex;
chunk_t measurement, pcr_before, pcr_after;
size_t hash_size, pcr_len;
u_int32_t extended_pcr;
pts_pcr_transform_t pcr_transform;
pts_meas_algorithms_t hash_algo;
switch (this->seq_no++)
{
case 0:
/* dummy data since currently the TBOOT log is not retrieved */
time(&this->measurement_time);
meas_hex = lib->settings->get_str(lib->settings,
"libimcv.plugins.imc-attestation.pcr17_meas", NULL);
pcr_before_hex = lib->settings->get_str(lib->settings,
"libimcv.plugins.imc-attestation.pcr17_before", NULL);
pcr_after_hex = lib->settings->get_str(lib->settings,
"libimcv.plugins.imc-attestation.pcr17_after", NULL);
extended_pcr = PCR_TBOOT_POLICY;
break;
case 1:
/* dummy data since currently the TBOOT log is not retrieved */
meas_hex = lib->settings->get_str(lib->settings,
"libimcv.plugins.imc-attestation.pcr18_meas", NULL);
pcr_before_hex = lib->settings->get_str(lib->settings,
"libimcv.plugins.imc-attestation.pcr18_before", NULL);
pcr_after_hex = lib->settings->get_str(lib->settings,
"libimcv.plugins.imc-attestation.pcr18_after", NULL);
extended_pcr = PCR_TBOOT_MLE;
break;
default:
return FAILED;
}
hash_algo = pts->get_meas_algorithm(pts);
hash_size = pts_meas_algo_hash_size(hash_algo);
pcr_len = pts->get_pcr_len(pts);
pcr_transform = pts_meas_algo_to_pcr_transform(hash_algo, pcr_len);
/* get and check the measurement data */
measurement = chunk_from_hex(
chunk_create(meas_hex, strlen(meas_hex)), NULL);
pcr_before = chunk_from_hex(
chunk_create(pcr_before_hex, strlen(pcr_before_hex)), NULL);
pcr_after = chunk_from_hex(
chunk_create(pcr_after_hex, strlen(pcr_after_hex)), NULL);
if (pcr_before.len != pcr_len || pcr_after.len != pcr_len ||
measurement.len != hash_size)
{
DBG1(DBG_PTS, "TBOOT measurement or pcr data have the wrong size");
free(measurement.ptr);
free(pcr_before.ptr);
free(pcr_after.ptr);
return FAILED;
}
evid = *evidence = pts_comp_evidence_create(this->name->clone(this->name),
this->depth, extended_pcr,
hash_algo, pcr_transform,
this->measurement_time, measurement);
evid->set_pcr_info(evid, pcr_before, pcr_after);
return (this->seq_no < 2) ? NEED_MORE : SUCCESS;
}
METHOD(pts_component_t, verify, status_t,
pts_ita_comp_tboot_t *this, pts_t *pts, pts_database_t *pts_db,
pts_comp_evidence_t *evidence)
{
bool has_pcr_info;
u_int32_t extended_pcr, vid, name;
enum_name_t *names;
pts_meas_algorithms_t algo;
pts_pcr_transform_t transform;
time_t measurement_time;
chunk_t measurement, pcr_before, pcr_after;
measurement = evidence->get_measurement(evidence, &extended_pcr,
&algo, &transform, &measurement_time);
if (!this->keyid.ptr)
{
if (!pts->get_aik_keyid(pts, &this->keyid))
{
return FAILED;
}
this->keyid = chunk_clone(this->keyid);
if (!pts_db)
{
DBG1(DBG_PTS, "pts database not available");
return FAILED;
}
if (!pts_db->get_comp_measurement_count(pts_db, this->name, this->keyid,
algo, &this->count))
{
return FAILED;
}
vid = this->name->get_vendor_id(this->name);
name = this->name->get_name(this->name);
names = pts_components->get_comp_func_names(pts_components, vid);
if (this->count == 0)
{
DBG1(DBG_PTS, "no %N '%N' functional component evidence measurements "
"available", pen_names, vid, names, name);
return FAILED;
}
DBG1(DBG_PTS, "checking %d %N '%N' functional component evidence measurements",
this->count, pen_names, vid, names, name);
}
if (pts_db->check_comp_measurement(pts_db, measurement, this->name,
this->keyid, ++this->seq_no, extended_pcr, algo) != SUCCESS)
{
return FAILED;
}
has_pcr_info = evidence->get_pcr_info(evidence, &pcr_before, &pcr_after);
if (has_pcr_info)
{
if (!pts->add_pcr(pts, extended_pcr, pcr_before, pcr_after))
{
return FAILED;
}
}
return (this->seq_no < this->count) ? NEED_MORE : SUCCESS;
}
METHOD(pts_component_t, destroy, void,
pts_ita_comp_tboot_t *this)
{
this->name->destroy(this->name);
free(this->keyid.ptr);
free(this);
}
/**
* See header
*/
pts_component_t *pts_ita_comp_tboot_create(u_int8_t qualifier, u_int32_t depth)
{
pts_ita_comp_tboot_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,
.destroy = _destroy,
},
.name = pts_comp_func_name_create(PEN_ITA, PTS_ITA_COMP_FUNC_NAME_TBOOT,
qualifier),
.depth = depth,
);
return &this->public;
}
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