1982e617aSMimi Zohar /* 2982e617aSMimi Zohar * Copyright (C) 2010 IBM Corporation 3982e617aSMimi Zohar * Copyright (C) 2010 Politecnico di Torino, Italy 4982e617aSMimi Zohar * TORSEC group -- http://security.polito.it 5982e617aSMimi Zohar * 6982e617aSMimi Zohar * Authors: 7982e617aSMimi Zohar * Mimi Zohar <zohar@us.ibm.com> 8982e617aSMimi Zohar * Roberto Sassu <roberto.sassu@polito.it> 9982e617aSMimi Zohar * 10982e617aSMimi Zohar * This program is free software; you can redistribute it and/or modify 11982e617aSMimi Zohar * it under the terms of the GNU General Public License as published by 12982e617aSMimi Zohar * the Free Software Foundation, version 2 of the License. 13982e617aSMimi Zohar * 14982e617aSMimi Zohar * See Documentation/security/keys-trusted-encrypted.txt 15982e617aSMimi Zohar */ 16982e617aSMimi Zohar 17982e617aSMimi Zohar #include <linux/uaccess.h> 18982e617aSMimi Zohar #include <linux/module.h> 19cc100551SStephen Rothwell #include <linux/err.h> 20982e617aSMimi Zohar #include <keys/trusted-type.h> 21ee0b31a2SMimi Zohar #include <keys/encrypted-type.h> 22ee0b31a2SMimi Zohar #include "encrypted.h" 23982e617aSMimi Zohar 24982e617aSMimi Zohar /* 25982e617aSMimi Zohar * request_trusted_key - request the trusted key 26982e617aSMimi Zohar * 27982e617aSMimi Zohar * Trusted keys are sealed to PCRs and other metadata. Although userspace 28982e617aSMimi Zohar * manages both trusted/encrypted key-types, like the encrypted key type 29982e617aSMimi Zohar * data, trusted key type data is not visible decrypted from userspace. 30982e617aSMimi Zohar */ 31982e617aSMimi Zohar struct key *request_trusted_key(const char *trusted_desc, 32982e617aSMimi Zohar u8 **master_key, size_t *master_keylen) 33982e617aSMimi Zohar { 34982e617aSMimi Zohar struct trusted_key_payload *tpayload; 35982e617aSMimi Zohar struct key *tkey; 36982e617aSMimi Zohar 37982e617aSMimi Zohar tkey = request_key(&key_type_trusted, trusted_desc, NULL); 38982e617aSMimi Zohar if (IS_ERR(tkey)) 39982e617aSMimi Zohar goto error; 40982e617aSMimi Zohar 41982e617aSMimi Zohar down_read(&tkey->sem); 42982e617aSMimi Zohar tpayload = rcu_dereference(tkey->payload.data); 43982e617aSMimi Zohar *master_key = tpayload->key; 44982e617aSMimi Zohar *master_keylen = tpayload->key_len; 45982e617aSMimi Zohar error: 46982e617aSMimi Zohar return tkey; 47982e617aSMimi Zohar } 48