161 lines
5.0 KiB
C
161 lines
5.0 KiB
C
/* internal.h: authentication token and access key management internal defs
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*
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* Copyright (C) 2003-5 Red Hat, Inc. All Rights Reserved.
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* Written by David Howells (dhowells@redhat.com)
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#ifndef _INTERNAL_H
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#define _INTERNAL_H
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#include <linux/key.h>
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#include <linux/key-ui.h>
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#if 0
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#define kenter(FMT, a...) printk("==> %s("FMT")\n",__FUNCTION__ , ## a)
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#define kleave(FMT, a...) printk("<== %s()"FMT"\n",__FUNCTION__ , ## a)
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#define kdebug(FMT, a...) printk(FMT"\n" , ## a)
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#else
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#define kenter(FMT, a...) do {} while(0)
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#define kleave(FMT, a...) do {} while(0)
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#define kdebug(FMT, a...) do {} while(0)
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#endif
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extern struct key_type key_type_dead;
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extern struct key_type key_type_user;
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/*****************************************************************************/
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/*
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* keep track of keys for a user
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* - this needs to be separate to user_struct to avoid a refcount-loop
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* (user_struct pins some keyrings which pin this struct)
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* - this also keeps track of keys under request from userspace for this UID
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*/
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struct key_user {
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struct rb_node node;
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struct list_head consq; /* construction queue */
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spinlock_t lock;
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atomic_t usage; /* for accessing qnkeys & qnbytes */
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atomic_t nkeys; /* number of keys */
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atomic_t nikeys; /* number of instantiated keys */
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uid_t uid;
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int qnkeys; /* number of keys allocated to this user */
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int qnbytes; /* number of bytes allocated to this user */
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};
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#define KEYQUOTA_MAX_KEYS 100
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#define KEYQUOTA_MAX_BYTES 10000
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#define KEYQUOTA_LINK_BYTES 4 /* a link in a keyring is worth 4 bytes */
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extern struct rb_root key_user_tree;
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extern spinlock_t key_user_lock;
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extern struct key_user root_key_user;
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extern struct key_user *key_user_lookup(uid_t uid);
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extern void key_user_put(struct key_user *user);
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extern struct rb_root key_serial_tree;
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extern spinlock_t key_serial_lock;
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extern struct semaphore key_alloc_sem;
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extern struct rw_semaphore key_construction_sem;
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extern wait_queue_head_t request_key_conswq;
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extern void keyring_publish_name(struct key *keyring);
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extern int __key_link(struct key *keyring, struct key *key);
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extern key_ref_t __keyring_search_one(key_ref_t keyring_ref,
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const struct key_type *type,
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const char *description,
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key_perm_t perm);
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extern struct key *keyring_search_instkey(struct key *keyring,
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key_serial_t target_id);
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typedef int (*key_match_func_t)(const struct key *, const void *);
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extern key_ref_t keyring_search_aux(key_ref_t keyring_ref,
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struct task_struct *tsk,
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struct key_type *type,
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const void *description,
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key_match_func_t match);
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extern key_ref_t search_process_keyrings(struct key_type *type,
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const void *description,
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key_match_func_t match,
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struct task_struct *tsk);
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extern struct key *find_keyring_by_name(const char *name, key_serial_t bound);
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extern int install_thread_keyring(struct task_struct *tsk);
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extern int install_process_keyring(struct task_struct *tsk);
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extern struct key *request_key_and_link(struct key_type *type,
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const char *description,
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const char *callout_info,
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struct key *dest_keyring);
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/*
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* request_key authorisation
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*/
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struct request_key_auth {
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struct key *target_key;
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struct task_struct *context;
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pid_t pid;
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};
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extern struct key_type key_type_request_key_auth;
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extern struct key *request_key_auth_new(struct key *target,
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struct key **_rkakey);
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extern struct key *key_get_instantiation_authkey(key_serial_t target_id);
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/*
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* keyctl functions
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*/
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extern long keyctl_get_keyring_ID(key_serial_t, int);
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extern long keyctl_join_session_keyring(const char __user *);
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extern long keyctl_update_key(key_serial_t, const void __user *, size_t);
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extern long keyctl_revoke_key(key_serial_t);
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extern long keyctl_keyring_clear(key_serial_t);
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extern long keyctl_keyring_link(key_serial_t, key_serial_t);
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extern long keyctl_keyring_unlink(key_serial_t, key_serial_t);
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extern long keyctl_describe_key(key_serial_t, char __user *, size_t);
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extern long keyctl_keyring_search(key_serial_t, const char __user *,
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const char __user *, key_serial_t);
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extern long keyctl_read_key(key_serial_t, char __user *, size_t);
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extern long keyctl_chown_key(key_serial_t, uid_t, gid_t);
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extern long keyctl_setperm_key(key_serial_t, key_perm_t);
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extern long keyctl_instantiate_key(key_serial_t, const void __user *,
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size_t, key_serial_t);
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extern long keyctl_negate_key(key_serial_t, unsigned, key_serial_t);
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extern long keyctl_set_reqkey_keyring(int);
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/*
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* debugging key validation
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*/
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#ifdef KEY_DEBUGGING
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extern void __key_check(const struct key *);
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static inline void key_check(const struct key *key)
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{
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if (key && (IS_ERR(key) || key->magic != KEY_DEBUG_MAGIC))
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__key_check(key);
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}
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#else
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#define key_check(key) do {} while(0)
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#endif
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#endif /* _INTERNAL_H */
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