48 lines
1.3 KiB
C
48 lines
1.3 KiB
C
|
/*
|
||
|
|
* Copyright (C) 2010 IBM Corporation
|
||
|
|
* Copyright (C) 2010 Politecnico di Torino, Italy
|
||
|
|
* TORSEC group -- http://security.polito.it
|
||
|
|
*
|
||
|
|
* Authors:
|
||
|
|
* Mimi Zohar <zohar@us.ibm.com>
|
||
|
|
* Roberto Sassu <roberto.sassu@polito.it>
|
||
|
|
*
|
||
|
|
* 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, version 2 of the License.
|
||
|
|
*
|
||
|
|
* See Documentation/security/keys-trusted-encrypted.txt
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include <linux/uaccess.h>
|
||
|
|
#include <linux/module.h>
|
||
|
|
#include <linux/err.h>
|
||
|
|
#include <keys/trusted-type.h>
|
||
|
|
#include <keys/encrypted-type.h>
|
||
|
|
#include "encrypted.h"
|
||
|
|
|
||
|
|
/*
|
||
|
|
* request_trusted_key - request the trusted key
|
||
|
|
*
|
||
|
|
* Trusted keys are sealed to PCRs and other metadata. Although userspace
|
||
|
|
* manages both trusted/encrypted key-types, like the encrypted key type
|
||
|
|
* data, trusted key type data is not visible decrypted from userspace.
|
||
|
|
*/
|
||
|
|
struct key *request_trusted_key(const char *trusted_desc,
|
||
|
|
u8 **master_key, size_t *master_keylen)
|
||
|
|
{
|
||
|
|
struct trusted_key_payload *tpayload;
|
||
|
|
struct key *tkey;
|
||
|
|
|
||
|
|
tkey = request_key(&key_type_trusted, trusted_desc, NULL);
|
||
|
|
if (IS_ERR(tkey))
|
||
|
|
goto error;
|
||
|
|
|
||
|
|
down_read(&tkey->sem);
|
||
|
|
tpayload = tkey->payload.data;
|
||
|
|
*master_key = tpayload->key;
|
||
|
|
*master_keylen = tpayload->key_len;
|
||
|
|
error:
|
||
|
|
return tkey;
|
||
|
|
}
|