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security: Add hooks to rule on setting a watch

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Add security hooks that will allow an LSM to rule on whether or not a watch
may be set.  More than one hook is required as the watches watch different
types of object.

Signed-off-by: David Howells <dhowells@redhat.com>
Acked-by: James Morris <jamorris@linux.microsoft.com>
cc: Casey Schaufler <casey@schaufler-ca.com>
cc: Stephen Smalley <sds@tycho.nsa.gov>
cc: linux-security-module@vger.kernel.org
This commit is contained in:
David Howells 2020-02-12 13:58:35 +00:00
parent c73be61ced
commit 998f50407f
4 changed files with 25 additions and 0 deletions
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4
include/linux/lsm_hook_defs.h
View File

@ -256,6 +256,10 @@ LSM_HOOK(int, 0, inode_getsecctx, struct inode *inode, void **ctx,
#if defined(CONFIG_SECURITY) && defined(CONFIG_WATCH_QUEUE)
LSM_HOOK(int, 0, post_notification, const struct cred *w_cred,
const struct cred *cred, struct watch_notification *n)
#endif /* CONFIG_SECURITY && CONFIG_WATCH_QUEUE */
#if defined(CONFIG_SECURITY) && defined(CONFIG_KEY_NOTIFICATIONS)
LSM_HOOK(int, 0, watch_key, struct key *key)
#endif /* CONFIG_SECURITY && CONFIG_KEY_NOTIFICATIONS */
#ifdef CONFIG_SECURITY_NETWORK

5
include/linux/lsm_hooks.h
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@ -1446,6 +1446,11 @@
* @cred: The event-triggerer's credentials
* @n: The notification being posted
*
* @watch_key:
* Check to see if a process is allowed to watch for event notifications
* from a key or keyring.
* @key: The key to watch.
*
* Security hooks for using the eBPF maps and programs functionalities through
* eBPF syscalls.
*

9
include/linux/security.h
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@ -1290,6 +1290,15 @@ static inline int security_post_notification(const struct cred *w_cred,
}
#endif
#if defined(CONFIG_SECURITY) && defined(CONFIG_KEY_NOTIFICATIONS)
int security_watch_key(struct key *key);
#else
static inline int security_watch_key(struct key *key)
{
return 0;
}
#endif
#ifdef CONFIG_SECURITY_NETWORK
int security_unix_stream_connect(struct sock *sock, struct sock *other, struct sock *newsk);

7
security/security.c
View File

@ -2016,6 +2016,13 @@ int security_post_notification(const struct cred *w_cred,
}
#endif /* CONFIG_WATCH_QUEUE */
#ifdef CONFIG_KEY_NOTIFICATIONS
int security_watch_key(struct key *key)
{
return call_int_hook(watch_key, 0, key);
}
#endif
#ifdef CONFIG_SECURITY_NETWORK
int security_unix_stream_connect(struct sock *sock, struct sock *other, struct sock *newsk)