key-ui.h
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上传日期:2009-04-28
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- /* key-ui.h: key userspace interface stuff
- *
- * Copyright (C) 2004 Red Hat, Inc. All Rights Reserved.
- * Written by David Howells (dhowells@redhat.com)
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version
- * 2 of the License, or (at your option) any later version.
- */
- #ifndef _LINUX_KEY_UI_H
- #define _LINUX_KEY_UI_H
- #include <linux/key.h>
- /* the key tree */
- extern struct rb_root key_serial_tree;
- extern spinlock_t key_serial_lock;
- /* required permissions */
- #define KEY_VIEW 0x01 /* require permission to view attributes */
- #define KEY_READ 0x02 /* require permission to read content */
- #define KEY_WRITE 0x04 /* require permission to update / modify */
- #define KEY_SEARCH 0x08 /* require permission to search (keyring) or find (key) */
- #define KEY_LINK 0x10 /* require permission to link */
- #define KEY_ALL 0x1f /* all the above permissions */
- /*
- * the keyring payload contains a list of the keys to which the keyring is
- * subscribed
- */
- struct keyring_list {
- struct rcu_head rcu; /* RCU deletion hook */
- unsigned short maxkeys; /* max keys this list can hold */
- unsigned short nkeys; /* number of keys currently held */
- unsigned short delkey; /* key to be unlinked by RCU */
- struct key *keys[0];
- };
- /*
- * check to see whether permission is granted to use a key in the desired way
- */
- extern int key_task_permission(const key_ref_t key_ref,
- struct task_struct *context,
- key_perm_t perm);
- static inline int key_permission(const key_ref_t key_ref, key_perm_t perm)
- {
- return key_task_permission(key_ref, current, perm);
- }
- extern key_ref_t lookup_user_key(struct task_struct *context,
- key_serial_t id, int create, int partial,
- key_perm_t perm);
- extern long join_session_keyring(const char *name);
- extern struct key_type *key_type_lookup(const char *type);
- extern void key_type_put(struct key_type *ktype);
- #define key_negative_timeout 60 /* default timeout on a negative key's existence */
- #endif /* _LINUX_KEY_UI_H */