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/*
* Copyright (C) 2011-2012 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 "tcg_pts_attr_aik.h"
#include <pa_tnc/pa_tnc_msg.h>
#include <bio/bio_writer.h>
#include <bio/bio_reader.h>
#include <debug.h>
typedef struct private_tcg_pts_attr_aik_t private_tcg_pts_attr_aik_t;
/**
* Attestation Identity Key
* see section 3.13 of PTS Protocol: Binding to TNC IF-M Specification
*
* 1 2 3
* 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Flags | Attestation Identity Key (Variable Length) ~
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Attestation Identity Key (Variable Length) ~
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
*/
#define PTS_AIK_SIZE 4
#define PTS_AIK_FLAGS_NONE 0
#define PTS_AIK_FLAGS_NAKED_KEY (1<<7)
/**
* Private data of an tcg_pts_attr_aik_t object.
*/
struct private_tcg_pts_attr_aik_t {
/**
* Public members of tcg_pts_attr_aik_t
*/
tcg_pts_attr_aik_t public;
/**
* Vendor-specific attribute type
*/
pen_type_t type;
/**
* Attribute value
*/
chunk_t value;
/**
* Noskip flag
*/
bool noskip_flag;
/**
* AIK Certificate or Public Key
*/
certificate_t *aik;
/**
* Reference count
*/
refcount_t ref;
};
METHOD(pa_tnc_attr_t, get_type, pen_type_t,
private_tcg_pts_attr_aik_t *this)
{
return this->type;
}
METHOD(pa_tnc_attr_t, get_value, chunk_t,
private_tcg_pts_attr_aik_t *this)
{
return this->value;
}
METHOD(pa_tnc_attr_t, get_noskip_flag, bool,
private_tcg_pts_attr_aik_t *this)
{
return this->noskip_flag;
}
METHOD(pa_tnc_attr_t, set_noskip_flag,void,
private_tcg_pts_attr_aik_t *this, bool noskip)
{
this->noskip_flag = noskip;
}
METHOD(pa_tnc_attr_t, build, void,
private_tcg_pts_attr_aik_t *this)
{
bio_writer_t *writer;
u_int8_t flags = PTS_AIK_FLAGS_NONE;
cred_encoding_type_t encoding_type = CERT_ASN1_DER;
chunk_t aik_blob;
if (this->value.ptr)
{
return;
}
if (this->aik->get_type(this->aik) == CERT_TRUSTED_PUBKEY)
{
flags |= PTS_AIK_FLAGS_NAKED_KEY;
encoding_type = PUBKEY_SPKI_ASN1_DER;
}
if (!this->aik->get_encoding(this->aik, encoding_type, &aik_blob))
{
DBG1(DBG_TNC, "encoding of Attestation Identity Key failed");
aik_blob = chunk_empty;
}
writer = bio_writer_create(PTS_AIK_SIZE);
writer->write_uint8(writer, flags);
writer->write_data (writer, aik_blob);
this->value = chunk_clone(writer->get_buf(writer));
free(aik_blob.ptr);
writer->destroy(writer);
}
METHOD(pa_tnc_attr_t, process, status_t,
private_tcg_pts_attr_aik_t *this, u_int32_t *offset)
{
bio_reader_t *reader;
u_int8_t flags;
certificate_type_t type;
chunk_t aik_blob;
if (this->value.len < PTS_AIK_SIZE)
{
DBG1(DBG_TNC, "insufficient data for Attestation Identity Key");
*offset = 0;
return FAILED;
}
reader = bio_reader_create(this->value);
reader->read_uint8(reader, &flags);
reader->read_data (reader, reader->remaining(reader), &aik_blob);
type = (flags & PTS_AIK_FLAGS_NAKED_KEY) ? CERT_TRUSTED_PUBKEY : CERT_X509;
this->aik = lib->creds->create(lib->creds, CRED_CERTIFICATE, type,
BUILD_BLOB_PEM, aik_blob, BUILD_END);
reader->destroy(reader);
if (!this->aik)
{
DBG1(DBG_TNC, "parsing of Attestation Identity Key failed");
*offset = 0;
return FAILED;
}
return SUCCESS;
}
METHOD(pa_tnc_attr_t, get_ref, pa_tnc_attr_t*,
private_tcg_pts_attr_aik_t *this)
{
ref_get(&this->ref);
return &this->public.pa_tnc_attribute;
}
METHOD(pa_tnc_attr_t, destroy, void,
private_tcg_pts_attr_aik_t *this)
{
if (ref_put(&this->ref))
{
DESTROY_IF(this->aik);
free(this->value.ptr);
free(this);
}
}
METHOD(tcg_pts_attr_aik_t, get_aik, certificate_t*,
private_tcg_pts_attr_aik_t *this)
{
return this->aik;
}
/**
* Described in header.
*/
pa_tnc_attr_t *tcg_pts_attr_aik_create(certificate_t *aik)
{
private_tcg_pts_attr_aik_t *this;
INIT(this,
.public = {
.pa_tnc_attribute = {
.get_type = _get_type,
.get_value = _get_value,
.get_noskip_flag = _get_noskip_flag,
.set_noskip_flag = _set_noskip_flag,
.build = _build,
.process = _process,
.get_ref = _get_ref,
.destroy = _destroy,
},
.get_aik = _get_aik,
},
.type = { PEN_TCG, TCG_PTS_AIK },
.aik = aik->get_ref(aik),
.ref = 1,
);
return &this->public.pa_tnc_attribute;
}
/**
* Described in header.
*/
pa_tnc_attr_t *tcg_pts_attr_aik_create_from_data(chunk_t data)
{
private_tcg_pts_attr_aik_t *this;
INIT(this,
.public = {
.pa_tnc_attribute = {
.get_type = _get_type,
.get_value = _get_value,
.get_noskip_flag = _get_noskip_flag,
.set_noskip_flag = _set_noskip_flag,
.build = _build,
.process = _process,
.get_ref = _get_ref,
.destroy = _destroy,
},
.get_aik = _get_aik,
},
.type = { PEN_TCG, TCG_PTS_AIK },
.value = chunk_clone(data),
.ref = 1,
);
return &this->public.pa_tnc_attribute;
}
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