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982e617a MZ |
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.txt | |
15 | */ | |
16 | ||
17 | #include <linux/uaccess.h> | |
18 | #include <linux/module.h> | |
cc100551 | 19 | #include <linux/err.h> |
982e617a | 20 | #include <keys/trusted-type.h> |
ee0b31a2 MZ |
21 | #include <keys/encrypted-type.h> |
22 | #include "encrypted.h" | |
982e617a MZ |
23 | |
24 | /* | |
25 | * request_trusted_key - request the trusted key | |
26 | * | |
27 | * Trusted keys are sealed to PCRs and other metadata. Although userspace | |
28 | * manages both trusted/encrypted key-types, like the encrypted key type | |
29 | * data, trusted key type data is not visible decrypted from userspace. | |
30 | */ | |
31 | struct key *request_trusted_key(const char *trusted_desc, | |
146aa8b1 | 32 | const u8 **master_key, size_t *master_keylen) |
982e617a MZ |
33 | { |
34 | struct trusted_key_payload *tpayload; | |
35 | struct key *tkey; | |
36 | ||
37 | tkey = request_key(&key_type_trusted, trusted_desc, NULL); | |
38 | if (IS_ERR(tkey)) | |
39 | goto error; | |
40 | ||
41 | down_read(&tkey->sem); | |
146aa8b1 | 42 | tpayload = tkey->payload.data[0]; |
982e617a MZ |
43 | *master_key = tpayload->key; |
44 | *master_keylen = tpayload->key_len; | |
45 | error: | |
46 | return tkey; | |
47 | } |