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1/* key-ui.h: key userspace interface stuff
2 *
3 * Copyright (C) 2004 Red Hat, Inc. All Rights Reserved.
4 * Written by David Howells (dhowells@redhat.com)
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version
9 * 2 of the License, or (at your option) any later version.
10 */
11
12#ifndef _LINUX_KEY_UI_H
13#define _LINUX_KEY_UI_H
14
15#include <linux/key.h>
16
17/* the key tree */
18extern struct rb_root key_serial_tree;
19extern spinlock_t key_serial_lock;
20
21/* required permissions */
22#define KEY_VIEW 0x01 /* require permission to view attributes */
23#define KEY_READ 0x02 /* require permission to read content */
24#define KEY_WRITE 0x04 /* require permission to update / modify */
25#define KEY_SEARCH 0x08 /* require permission to search (keyring) or find (key) */
26#define KEY_LINK 0x10 /* require permission to link */
27#define KEY_ALL 0x1f /* all the above permissions */
28
29/*
30 * the keyring payload contains a list of the keys to which the keyring is
31 * subscribed
32 */
33struct keyring_list {
34 struct rcu_head rcu; /* RCU deletion hook */
35 unsigned short maxkeys; /* max keys this list can hold */
36 unsigned short nkeys; /* number of keys currently held */
37 unsigned short delkey; /* key to be unlinked by RCU */
38 struct key *keys[0];
39};
40
41/*
42 * check to see whether permission is granted to use a key in the desired way
43 */
44extern int key_task_permission(const key_ref_t key_ref,
45 struct task_struct *context,
46 key_perm_t perm);
47
48static inline int key_permission(const key_ref_t key_ref, key_perm_t perm)
49{
50 return key_task_permission(key_ref, current, perm);
51}
52
53extern key_ref_t lookup_user_key(struct task_struct *context,
54 key_serial_t id, int create, int partial,
55 key_perm_t perm);
56
57extern long join_session_keyring(const char *name);
58
59extern struct key_type *key_type_lookup(const char *type);
60extern void key_type_put(struct key_type *ktype);
61
62#define key_negative_timeout 60 /* default timeout on a negative key's existence */
63
64
65#endif /* _LINUX_KEY_UI_H */