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IMA: create machine owner and blacklist keyrings

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This option creates IMA MOK and blacklist keyrings.  IMA MOK is an
intermediate keyring that sits between .system and .ima keyrings,
effectively forming a simple CA hierarchy.  To successfully import a key
into .ima_mok it must be signed by a key which CA is in .system keyring.
On turn any key that needs to go in .ima keyring must be signed by CA in
either .system or .ima_mok keyrings. IMA MOK is empty at kernel boot.

IMA blacklist keyring contains all revoked IMA keys.  It is consulted
before any other keyring.  If the search is successful the requested
operation is rejected and error is returned to the caller.

Signed-off-by: Petko Manolov <petkan@mip-labs.com>
Signed-off-by: Mimi Zohar <zohar@linux.vnet.ibm.com>
This commit is contained in:
Petko Manolov
2015-12-02 17:47:55 +02:00
committed by Mimi Zohar
parent 38d859f991
commit 41c89b64d7
6 changed files with 113 additions and 0 deletions
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24
include/keys/system_keyring.h
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@@ -35,4 +35,28 @@ extern int system_verify_data(const void *data, unsigned long len,
enum key_being_used_for usage);
#endif
#ifdef CONFIG_IMA_MOK_KEYRING
extern struct key *ima_mok_keyring;
extern struct key *ima_blacklist_keyring;
static inline struct key *get_ima_mok_keyring(void)
{
return ima_mok_keyring;
}
static inline struct key *get_ima_blacklist_keyring(void)
{
return ima_blacklist_keyring;
}
#else
static inline struct key *get_ima_mok_keyring(void)
{
return NULL;
}
static inline struct key *get_ima_blacklist_keyring(void)
{
return NULL;
}
#endif /* CONFIG_IMA_MOK_KEYRING */
#endif /* _KEYS_SYSTEM_KEYRING_H */