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selinux: Implement the watch_key security hook 

Implement the watch_key security hook to make sure that a key grants the
caller View permission in order to set a watch on a key.

For the moment, the watch_devices security hook is left unimplemented as
it's not obvious what the object should be since the queue is global and
didn't previously exist.

Signed-off-by: David Howells <dhowells@redhat.com>
Acked-by: Stephen Smalley <sds@tycho.nsa.gov>
Reviewed-by: James Morris <jamorris@linux.microsoft.com>
This commit is contained in:
David Howells 2020-01-14 17:07:13 +00:00
parent 8c0637e950
commit 3e412ccc22
1 changed files with 14 additions and 0 deletions
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14
security/selinux/hooks.c
View File

@ -6619,6 +6619,17 @@ static int selinux_key_getsecurity(struct key *key, char **_buffer)
*_buffer = context;
return rc;
}
#ifdef CONFIG_KEY_NOTIFICATIONS
static int selinux_watch_key(struct key *key)
{
struct key_security_struct *ksec = key->security;
u32 sid = current_sid();
return avc_has_perm(&selinux_state,
sid, ksec->sid, SECCLASS_KEY, KEY__VIEW, NULL);
}
#endif
#endif
#ifdef CONFIG_SECURITY_INFINIBAND
@ -7134,6 +7145,9 @@ static struct security_hook_list selinux_hooks[] __lsm_ro_after_init = {
LSM_HOOK_INIT(key_free, selinux_key_free),
LSM_HOOK_INIT(key_permission, selinux_key_permission),
LSM_HOOK_INIT(key_getsecurity, selinux_key_getsecurity),
#ifdef CONFIG_KEY_NOTIFICATIONS
LSM_HOOK_INIT(watch_key, selinux_watch_key),
#endif
#endif
#ifdef CONFIG_AUDIT