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security: Introduce key_post_create_or_update hook

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In preparation for moving IMA and EVM to the LSM infrastructure, introduce
the key_post_create_or_update hook.

Depending on policy, IMA measures the key content after creation or update,
so that remote verifiers are aware of the operation.

Other LSMs could similarly take some action after successful key creation
or update.

The new hook cannot return an error and cannot cause the operation to be
reverted.

Signed-off-by: Roberto Sassu <roberto.sassu@huawei.com>
Reviewed-by: Stefan Berger <stefanb@linux.ibm.com>
Acked-by: Casey Schaufler <casey@schaufler-ca.com>
Reviewed-by: Mimi Zohar <zohar@linux.ibm.com>
Signed-off-by: Paul Moore <paul@paul-moore.com>
This commit is contained in:
Roberto Sassu
2024-02-15 11:31:06 +01:00
committed by Paul Moore
parent 2d705d8024
commit b8d997032a
4 changed files with 39 additions and 1 deletions
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3
include/linux/lsm_hook_defs.h
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@@ -405,6 +405,9 @@ LSM_HOOK(void, LSM_RET_VOID, key_free, struct key *key)
LSM_HOOK(int, 0, key_permission, key_ref_t key_ref, const struct cred *cred,
enum key_need_perm need_perm)
LSM_HOOK(int, 0, key_getsecurity, struct key *key, char **buffer)
LSM_HOOK(void, LSM_RET_VOID, key_post_create_or_update, struct key *keyring,
struct key *key, const void *payload, size_t payload_len,
unsigned long flags, bool create)
#endif /* CONFIG_KEYS */
#ifdef CONFIG_AUDIT