security/keys/internal.h

   1 /* internal.h: authentication token and access key management internal defs
   2  *
   3  * Copyright (C) 2003 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 _INTERNAL_H
  13 #define _INTERNAL_H
  14
  15 #include <linux/key.h>
  16 #include <linux/key-ui.h>
  17
  18 extern struct key_type key_type_dead;
  19 extern struct key_type key_type_user;
  20
  21 /*****************************************************************************/
  22 /*
  23  * keep track of keys for a user
  24  * - this needs to be separate to user_struct to avoid a refcount-loop
  25  *   (user_struct pins some keyrings which pin this struct)
  26  * - this also keeps track of keys under request from userspace for this UID
  27  */
  28 struct key_user {
  29         struct rb_node          node;
  30         struct list_head        consq;          /* construction queue */
  31         spinlock_t              lock;
  32         atomic_t                usage;          /* for accessing qnkeys & qnbytes */
  33         atomic_t                nkeys;          /* number of keys */
  34         atomic_t                nikeys;         /* number of instantiated keys */
  35         uid_t                   uid;
  36         int                     qnkeys;         /* number of keys allocated to this user */
  37         int                     qnbytes;        /* number of bytes allocated to this user */
  38 };
  39
  40 #define KEYQUOTA_MAX_KEYS       100
  41 #define KEYQUOTA_MAX_BYTES      10000
  42 #define KEYQUOTA_LINK_BYTES     4               /* a link in a keyring is worth 4 bytes */
  43
  44 extern struct rb_root   key_user_tree;
  45 extern spinlock_t       key_user_lock;
  46 extern struct key_user  root_key_user;
  47
  48 extern struct key_user *key_user_lookup(uid_t uid);
  49 extern void key_user_put(struct key_user *user);
  50
  51
  52
  53 extern struct rb_root key_serial_tree;
  54 extern spinlock_t key_serial_lock;
  55 extern struct semaphore key_alloc_sem;
  56 extern struct rw_semaphore key_construction_sem;
  57 extern wait_queue_head_t request_key_conswq;
  58
  59
  60 extern void keyring_publish_name(struct key *keyring);
  61
  62 extern int __key_link(struct key *keyring, struct key *key);
  63
  64 extern struct key *__keyring_search_one(struct key *keyring,
  65                                         const struct key_type *type,
  66                                         const char *description,
  67                                         key_perm_t perm);
  68
  69 typedef int (*key_match_func_t)(const struct key *, const void *);
  70
  71 extern struct key *keyring_search_aux(struct key *keyring,
  72                                       struct key_type *type,
  73                                       const void *description,
  74                                       key_match_func_t match);
  75
  76 extern struct key *search_process_keyrings_aux(struct key_type *type,
  77                                                const void *description,
  78                                                key_match_func_t match);
  79
  80 extern struct key *find_keyring_by_name(const char *name, key_serial_t bound);
  81
  82 extern int install_thread_keyring(struct task_struct *tsk);
  83
  84 /*
  85  * keyctl functions
  86  */
  87 extern long keyctl_get_keyring_ID(key_serial_t, int);
  88 extern long keyctl_join_session_keyring(const char __user *);
  89 extern long keyctl_update_key(key_serial_t, const void __user *, size_t);
  90 extern long keyctl_revoke_key(key_serial_t);
  91 extern long keyctl_keyring_clear(key_serial_t);
  92 extern long keyctl_keyring_link(key_serial_t, key_serial_t);
  93 extern long keyctl_keyring_unlink(key_serial_t, key_serial_t);
  94 extern long keyctl_describe_key(key_serial_t, char __user *, size_t);
  95 extern long keyctl_keyring_search(key_serial_t, const char __user *,
  96                                   const char __user *, key_serial_t);
  97 extern long keyctl_read_key(key_serial_t, char __user *, size_t);
  98 extern long keyctl_chown_key(key_serial_t, uid_t, gid_t);
  99 extern long keyctl_setperm_key(key_serial_t, key_perm_t);
 100 extern long keyctl_instantiate_key(key_serial_t, const void __user *,
 101                                    size_t, key_serial_t);
 102 extern long keyctl_negate_key(key_serial_t, unsigned, key_serial_t);
 103
 104
 105 /*
 106  * debugging key validation
 107  */
 108 #ifdef KEY_DEBUGGING
 109 extern void __key_check(const struct key *);
 110
 111 static inline void key_check(const struct key *key)
 112 {
 113         if (key && (IS_ERR(key) || key->magic != KEY_DEBUG_MAGIC))
 114                 __key_check(key);
 115 }
 116
 117 #else
 118
 119 #define key_check(key) do {} while(0)
 120
 121 #endif
 122
 123 #endif /* _INTERNAL_H */