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encrypted-keys: remove trusted-keys dependency

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Encrypted keys are decrypted/encrypted using either a trusted-key or,
for those systems without a TPM, a user-defined key.  This patch
removes the trusted-keys and TCG_TPM dependencies.

Signed-off-by: Mimi Zohar <zohar@us.ibm.com>
This commit is contained in:
Mimi Zohar 2011-08-27 22:21:26 -04:00
parent 61cf45d019
commit 982e617a31
5 changed files with 67 additions and 28 deletions
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4
security/Kconfig
View file

@ -38,7 +38,9 @@ config TRUSTED_KEYS
config ENCRYPTED_KEYS
tristate "ENCRYPTED KEYS"
depends on KEYS && TRUSTED_KEYS
depends on KEYS
select CRYPTO
select CRYPTO_HMAC
select CRYPTO_AES
select CRYPTO_CBC
select CRYPTO_SHA256

1
security/keys/encrypted-keys/Makefile
View file

@ -3,3 +3,4 @@
#
obj-$(CONFIG_ENCRYPTED_KEYS) += encrypted.o ecryptfs_format.o
obj-$(CONFIG_TRUSTED_KEYS) += masterkey_trusted.o

35
security/keys/encrypted-keys/encrypted.c
View file

@ -298,31 +298,6 @@ static char *datablob_format(struct encrypted_key_payload *epayload,
return ascii_buf;
}
/*
* request_trusted_key - request the trusted key
*
* Trusted keys are sealed to PCRs and other metadata. Although userspace
* manages both trusted/encrypted key-types, like the encrypted key type
* data, trusted key type data is not visible decrypted from userspace.
*/
static struct key *request_trusted_key(const char *trusted_desc,
u8 **master_key, size_t *master_keylen)
{
struct trusted_key_payload *tpayload;
struct key *tkey;
tkey = request_key(&key_type_trusted, trusted_desc, NULL);
if (IS_ERR(tkey))
goto error;
down_read(&tkey->sem);
tpayload = rcu_dereference(tkey->payload.data);
*master_key = tpayload->key;
*master_keylen = tpayload->key_len;
error:
return tkey;
}
/*
* request_user_key - request the user key
*
@ -469,8 +444,14 @@ static struct key *request_master_key(struct encrypted_key_payload *epayload,
goto out;
if (IS_ERR(mkey)) {
pr_info("encrypted_key: key %s not found",
epayload->master_desc);
int ret = PTR_ERR(epayload);
if (ret == -ENOTSUPP)
pr_info("encrypted_key: key %s not supported",
epayload->master_desc);
else
pr_info("encrypted_key: key %s not found",
epayload->master_desc);
goto out;
}

11
security/keys/encrypted-keys/encrypted.h
View file

@ -2,6 +2,17 @@
#define __ENCRYPTED_KEY_H
#define ENCRYPTED_DEBUG 0
#ifdef CONFIG_TRUSTED_KEYS
extern struct key *request_trusted_key(const char *trusted_desc,
u8 **master_key, size_t *master_keylen);
#else
static inline struct key *request_trusted_key(const char *trusted_desc,
u8 **master_key,
size_t *master_keylen)
{
return ERR_PTR(-EOPNOTSUPP);
}
#endif
#if ENCRYPTED_DEBUG
static inline void dump_master_key(const u8 *master_key, size_t master_keylen)

44
security/keys/encrypted-keys/masterkey_trusted.c Normal file
View file

@ -0,0 +1,44 @@
/*
* Copyright (C) 2010 IBM Corporation
* Copyright (C) 2010 Politecnico di Torino, Italy
* TORSEC group -- http://security.polito.it
*
* Authors:
* Mimi Zohar <zohar@us.ibm.com>
* Roberto Sassu <roberto.sassu@polito.it>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, version 2 of the License.
*
* See Documentation/security/keys-trusted-encrypted.txt
*/
#include <linux/uaccess.h>
#include <linux/module.h>
#include <keys/trusted-type.h>
/*
* request_trusted_key - request the trusted key
*
* Trusted keys are sealed to PCRs and other metadata. Although userspace
* manages both trusted/encrypted key-types, like the encrypted key type
* data, trusted key type data is not visible decrypted from userspace.
*/
struct key *request_trusted_key(const char *trusted_desc,
u8 **master_key, size_t *master_keylen)
{
struct trusted_key_payload *tpayload;
struct key *tkey;
tkey = request_key(&key_type_trusted, trusted_desc, NULL);
if (IS_ERR(tkey))
goto error;
down_read(&tkey->sem);
tpayload = rcu_dereference(tkey->payload.data);
*master_key = tpayload->key;
*master_keylen = tpayload->key_len;
error:
return tkey;
}