forked from luck/tmp_suning_uos_patched
56104cf2b8
Add a config option (IMA_KEYRINGS_PERMIT_SIGNED_BY_BUILTIN_OR_SECONDARY) that, when enabled, allows keys to be added to the IMA keyrings by userspace - with the restriction that each must be signed by a key in the system trusted keyrings. EPERM will be returned if this option is disabled, ENOKEY will be returned if no authoritative key can be found and EKEYREJECTED will be returned if the signature doesn't match. Other errors such as ENOPKG may also be returned. If this new option is enabled, the builtin system keyring is searched, as is the secondary system keyring if that is also enabled. Intermediate keys between the builtin system keyring and the key being added can be added to the secondary keyring (which replaces .ima_mok) to form a trust chain - provided they are also validly signed by a key in one of the trusted keyrings. The .ima_mok keyring is then removed and the IMA blacklist keyring gets its own config option (IMA_BLACKLIST_KEYRING). Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: Mimi Zohar <zohar@linux.vnet.ibm.com>
52 lines
1.4 KiB
C
52 lines
1.4 KiB
C
/* System keyring containing trusted public keys.
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*
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* Copyright (C) 2013 Red Hat, Inc. All Rights Reserved.
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* Written by David Howells (dhowells@redhat.com)
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public Licence
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* as published by the Free Software Foundation; either version
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* 2 of the Licence, or (at your option) any later version.
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*/
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#ifndef _KEYS_SYSTEM_KEYRING_H
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#define _KEYS_SYSTEM_KEYRING_H
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#include <linux/key.h>
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#ifdef CONFIG_SYSTEM_TRUSTED_KEYRING
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extern int restrict_link_by_builtin_trusted(struct key *keyring,
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const struct key_type *type,
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const union key_payload *payload);
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#else
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#define restrict_link_by_builtin_trusted restrict_link_reject
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#endif
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#ifdef CONFIG_SECONDARY_TRUSTED_KEYRING
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extern int restrict_link_by_builtin_and_secondary_trusted(
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struct key *keyring,
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const struct key_type *type,
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const union key_payload *payload);
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#else
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#define restrict_link_by_builtin_and_secondary_trusted restrict_link_by_builtin_trusted
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#endif
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#ifdef CONFIG_IMA_BLACKLIST_KEYRING
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extern struct key *ima_blacklist_keyring;
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static inline struct key *get_ima_blacklist_keyring(void)
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{
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return ima_blacklist_keyring;
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}
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#else
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static inline struct key *get_ima_blacklist_keyring(void)
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{
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return NULL;
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}
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#endif /* CONFIG_IMA_BLACKLIST_KEYRING */
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#endif /* _KEYS_SYSTEM_KEYRING_H */
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