Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* key-ui.h: key userspace interface stuff for use by keyfs |
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 */ | |
18 | extern struct rb_root key_serial_tree; | |
19 | extern 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 | */ | |
33 | struct keyring_list { | |
34 | unsigned maxkeys; /* max keys this list can hold */ | |
35 | unsigned nkeys; /* number of keys currently held */ | |
36 | struct key *keys[0]; | |
37 | }; | |
38 | ||
39 | ||
40 | /* | |
41 | * check to see whether permission is granted to use a key in the desired way | |
42 | */ | |
43 | static inline int key_permission(const struct key *key, key_perm_t perm) | |
44 | { | |
45 | key_perm_t kperm; | |
46 | ||
47 | if (key->uid == current->fsuid) | |
48 | kperm = key->perm >> 16; | |
49 | else if (key->gid != -1 && | |
50 | key->perm & KEY_GRP_ALL && | |
51 | in_group_p(key->gid) | |
52 | ) | |
53 | kperm = key->perm >> 8; | |
54 | else | |
55 | kperm = key->perm; | |
56 | ||
57 | kperm = kperm & perm & KEY_ALL; | |
58 | ||
59 | return kperm == perm; | |
60 | } | |
61 | ||
62 | /* | |
63 | * check to see whether permission is granted to use a key in at least one of | |
64 | * the desired ways | |
65 | */ | |
66 | static inline int key_any_permission(const struct key *key, key_perm_t perm) | |
67 | { | |
68 | key_perm_t kperm; | |
69 | ||
70 | if (key->uid == current->fsuid) | |
71 | kperm = key->perm >> 16; | |
72 | else if (key->gid != -1 && | |
73 | key->perm & KEY_GRP_ALL && | |
74 | in_group_p(key->gid) | |
75 | ) | |
76 | kperm = key->perm >> 8; | |
77 | else | |
78 | kperm = key->perm; | |
79 | ||
80 | kperm = kperm & perm & KEY_ALL; | |
81 | ||
82 | return kperm != 0; | |
83 | } | |
84 | ||
85 | ||
86 | extern struct key *lookup_user_key(key_serial_t id, int create, int part, | |
87 | key_perm_t perm); | |
88 | ||
89 | extern long join_session_keyring(const char *name); | |
90 | ||
91 | extern struct key_type *key_type_lookup(const char *type); | |
92 | extern void key_type_put(struct key_type *ktype); | |
93 | ||
94 | #define key_negative_timeout 60 /* default timeout on a negative key's existence */ | |
95 | ||
96 | ||
97 | #endif /* _LINUX_KEY_UI_H */ |