| 1 | // SPDX-License-Identifier: GPL-2.0-only |
|---|---|
| 2 | /* |
| 3 | * Copyright (C) 2010 IBM Corporation |
| 4 | * Copyright (C) 2010 Politecnico di Torino, Italy |
| 5 | * TORSEC group -- https://security.polito.it |
| 6 | * |
| 7 | * Authors: |
| 8 | * Mimi Zohar <zohar@us.ibm.com> |
| 9 | * Roberto Sassu <roberto.sassu@polito.it> |
| 10 | * |
| 11 | * See Documentation/security/keys/trusted-encrypted.rst |
| 12 | */ |
| 13 | |
| 14 | #include <linux/uaccess.h> |
| 15 | #include <linux/err.h> |
| 16 | #include <keys/trusted-type.h> |
| 17 | #include <keys/encrypted-type.h> |
| 18 | #include "encrypted.h" |
| 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, |
| 28 | const u8 **master_key, size_t *master_keylen) |
| 29 | { |
| 30 | struct trusted_key_payload *tpayload; |
| 31 | struct key *tkey; |
| 32 | |
| 33 | tkey = request_key(type: &key_type_trusted, description: trusted_desc, NULL); |
| 34 | if (IS_ERR(ptr: tkey)) |
| 35 | goto error; |
| 36 | |
| 37 | down_read(sem: &tkey->sem); |
| 38 | tpayload = tkey->payload.data[0]; |
| 39 | *master_key = tpayload->key; |
| 40 | *master_keylen = tpayload->key_len; |
| 41 | error: |
| 42 | return tkey; |
| 43 | } |
| 44 |