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b886d83c | 1 | // SPDX-License-Identifier: GPL-2.0-only |
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2 | /* |
3 | * Copyright (C) 2010 IBM Corporation | |
4 | * Copyright (C) 2010 Politecnico di Torino, Italy | |
c9fecf50 | 5 | * TORSEC group -- https://security.polito.it |
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6 | * |
7 | * Authors: | |
8 | * Mimi Zohar <zohar@us.ibm.com> | |
9 | * Roberto Sassu <roberto.sassu@polito.it> | |
10 | * | |
5395d312 | 11 | * See Documentation/security/keys/trusted-encrypted.rst |
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12 | */ |
13 | ||
14 | #include <linux/uaccess.h> | |
cc100551 | 15 | #include <linux/err.h> |
982e617a | 16 | #include <keys/trusted-type.h> |
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17 | #include <keys/encrypted-type.h> |
18 | #include "encrypted.h" | |
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19 | |
20 | /* | |
21 | * request_trusted_key - request the trusted key | |
22 | * | |
23 | * Trusted keys are sealed to PCRs and other metadata. Although userspace | |
24 | * manages both trusted/encrypted key-types, like the encrypted key type | |
25 | * data, trusted key type data is not visible decrypted from userspace. | |
26 | */ | |
27 | struct key *request_trusted_key(const char *trusted_desc, | |
146aa8b1 | 28 | const u8 **master_key, size_t *master_keylen) |
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29 | { |
30 | struct trusted_key_payload *tpayload; | |
31 | struct key *tkey; | |
32 | ||
028db3e2 | 33 | tkey = request_key(&key_type_trusted, trusted_desc, NULL); |
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34 | if (IS_ERR(tkey)) |
35 | goto error; | |
36 | ||
37 | down_read(&tkey->sem); | |
146aa8b1 | 38 | tpayload = tkey->payload.data[0]; |
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39 | *master_key = tpayload->key; |
40 | *master_keylen = tpayload->key_len; | |
41 | error: | |
42 | return tkey; | |
43 | } |