tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * Copyright (C) 2010 IBM Corporation
3 * Copyright (C) 2010 Politecnico di Torino, Italy
4 * TORSEC group -- http://security.polito.it
5 *
6 * Authors:
7 * Mimi Zohar <zohar@us.ibm.com>
8 * Roberto Sassu <roberto.sassu@polito.it>
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation, version 2 of the License.
13 *
14 * See Documentation/security/keys/trusted-encrypted.rst
15 */
16
17#include <linux/uaccess.h>
18#include <linux/err.h>
19#include <keys/trusted-type.h>
20#include <keys/encrypted-type.h>
21#include "encrypted.h"
22
23/*
24 * request_trusted_key - request the trusted key
25 *
26 * Trusted keys are sealed to PCRs and other metadata. Although userspace
27 * manages both trusted/encrypted key-types, like the encrypted key type
28 * data, trusted key type data is not visible decrypted from userspace.
29 */
30struct key *request_trusted_key(const char *trusted_desc,
31 const u8 **master_key, size_t *master_keylen)
32{
33 struct trusted_key_payload *tpayload;
34 struct key *tkey;
35
36 tkey = request_key(&key_type_trusted, trusted_desc, NULL);
37 if (IS_ERR(tkey))
38 goto error;
39
40 down_read(&tkey->sem);
41 tpayload = tkey->payload.data[0];
42 *master_key = tpayload->key;
43 *master_keylen = tpayload->key_len;
44error:
45 return tkey;
46}