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/*
* Copyright (C) 2017 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 "tpm_private_key.h"
#include <tpm_tss.h>
#include <utils/debug.h>
typedef struct private_tpm_private_key_t private_tpm_private_key_t;
/**
* Private data of an tpm_private_key_t object.
*/
struct private_tpm_private_key_t {
/**
* Public tpm_private_key_t interface.
*/
tpm_private_key_t public;
/**
* Token keyid used to reference optional PIN for TPM key
*/
identification_t *keyid;
/**
* Trusted Platform Module
*/
tpm_tss_t *tpm;
/**
* TPM key object handle
*/
uint32_t handle;
/**
* Hierarchy the TPM key object is attached to
*/
uint32_t hierarchy;
/**
* Associated public key
*/
public_key_t *pubkey;
/**
* References to this key
*/
refcount_t ref;
};
METHOD(private_key_t, get_type, key_type_t,
private_tpm_private_key_t *this)
{
return this->pubkey->get_type(this->pubkey);
}
METHOD(private_key_t, get_keysize, int,
private_tpm_private_key_t *this)
{
return this->pubkey->get_keysize(this->pubkey);
}
METHOD(private_key_t, sign, bool,
private_tpm_private_key_t *this, signature_scheme_t scheme,
chunk_t data, chunk_t *signature)
{
chunk_t pin = chunk_empty;
shared_key_t *shared;
enumerator_t *enumerator;
/* check for optional PIN */
enumerator = lib->credmgr->create_shared_enumerator(lib->credmgr,
SHARED_PIN, this->keyid, NULL);
if (enumerator->enumerate(enumerator, &shared, NULL, NULL))
{
pin = shared->get_key(shared);
}
enumerator->destroy(enumerator);
return this->tpm->sign(this->tpm, this->hierarchy, this->handle, scheme,
data, pin, signature);
}
METHOD(private_key_t, decrypt, bool,
private_tpm_private_key_t *this, encryption_scheme_t scheme,
chunk_t crypt, chunk_t *plain)
{
return FALSE;
}
METHOD(private_key_t, get_public_key, public_key_t*,
private_tpm_private_key_t *this)
{
return this->pubkey->get_ref(this->pubkey);
}
METHOD(private_key_t, get_fingerprint, bool,
private_tpm_private_key_t *this, cred_encoding_type_t type,
chunk_t *fingerprint)
{
return this->pubkey->get_fingerprint(this->pubkey, type, fingerprint);
}
METHOD(private_key_t, get_encoding, bool,
private_tpm_private_key_t *this, cred_encoding_type_t type,
chunk_t *encoding)
{
return FALSE;
}
METHOD(private_key_t, get_ref, private_key_t*,
private_tpm_private_key_t *this)
{
ref_get(&this->ref);
return &this->public.key;
}
METHOD(private_key_t, destroy, void,
private_tpm_private_key_t *this)
{
if (ref_put(&this->ref))
{
DESTROY_IF(this->pubkey);
this->tpm->destroy(this->tpm);
this->keyid->destroy(this->keyid);
free(this);
}
}
/**
* See header.
*/
tpm_private_key_t *tpm_private_key_connect(key_type_t type, va_list args)
{
private_tpm_private_key_t *this;
tpm_tss_t *tpm;
chunk_t keyid = chunk_empty, pubkey_blob = chunk_empty;
char handle_str[4];
size_t len;
uint32_t hierarchy = 0x4000000B; /* TPM_RH_ENDORSEMENT */
uint32_t handle;
while (TRUE)
{
switch (va_arg(args, builder_part_t))
{
case BUILD_PKCS11_KEYID:
keyid = va_arg(args, chunk_t);
continue;
case BUILD_PKCS11_SLOT:
hierarchy = va_arg(args, int);
continue;
case BUILD_PKCS11_MODULE:
va_arg(args, char*);
continue;
case BUILD_END:
break;
default:
return NULL;
}
break;
}
/* convert keyid into 32 bit TPM key object handle */
if (!keyid.len)
{
return NULL;
}
len = min(keyid.len, 4);
memset(handle_str, 0x00, 4);
memcpy(handle_str + 4 - len, keyid.ptr + keyid.len - len, len);
handle = untoh32(handle_str);
/* try to find a TPM 2.0 */
tpm = tpm_tss_probe(TPM_VERSION_2_0);
if (!tpm)
{
DBG1(DBG_LIB, "no TPM 2.0 found");
return NULL;
}
INIT(this,
.public = {
.key = {
.get_type = _get_type,
.sign = _sign,
.decrypt = _decrypt,
.get_keysize = _get_keysize,
.get_public_key = _get_public_key,
.equals = private_key_equals,
.belongs_to = private_key_belongs_to,
.get_fingerprint = _get_fingerprint,
.has_fingerprint = private_key_has_fingerprint,
.get_encoding = _get_encoding,
.get_ref = _get_ref,
.destroy = _destroy,
},
},
.tpm = tpm,
.keyid = identification_create_from_encoding(ID_KEY_ID, keyid),
.handle = handle,
.hierarchy = hierarchy,
.ref = 1,
);
/* get public key from TPM */
pubkey_blob = tpm->get_public(tpm, handle);
if (!pubkey_blob.len)
{
destroy(this);
return NULL;
}
this->pubkey = lib->creds->create(lib->creds, CRED_PUBLIC_KEY, KEY_ANY,
BUILD_BLOB_ASN1_DER, pubkey_blob, BUILD_END);
chunk_free(&pubkey_blob);
if (!this->pubkey)
{
destroy(this);
return NULL;
}
return &this->public;
}
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