security/keys/internal.h

   1 /* internal.h: authentication token and access key management internal defs
   2  *
   3  * Copyright (C) 2003-5 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 #if 0
  19 #define kenter(FMT, a...)       printk("==> %s("FMT")\n",__FUNCTION__ , ## a)
  20 #define kleave(FMT, a...)       printk("<== %s()"FMT"\n",__FUNCTION__ , ## a)
  21 #define kdebug(FMT, a...)       printk(FMT"\n" , ## a)
  22 #else
  23 #define kenter(FMT, a...)       do {} while(0)
  24 #define kleave(FMT, a...)       do {} while(0)
  25 #define kdebug(FMT, a...)       do {} while(0)
  26 #endif
  27
  28 extern struct key_type key_type_dead;
  29 extern struct key_type key_type_user;
  30
  31 /*****************************************************************************/
  32 /*
  33  * keep track of keys for a user
  34  * - this needs to be separate to user_struct to avoid a refcount-loop
  35  *   (user_struct pins some keyrings which pin this struct)
  36  * - this also keeps track of keys under request from userspace for this UID
  37  */
  38 struct key_user {
  39         struct rb_node          node;
  40         struct list_head        consq;          /* construction queue */
  41         spinlock_t              lock;
  42         atomic_t                usage;          /* for accessing qnkeys & qnbytes */
  43         atomic_t                nkeys;          /* number of keys */
  44         atomic_t                nikeys;         /* number of instantiated keys */
  45         uid_t                   uid;
  46         int                     qnkeys;         /* number of keys allocated to this user */
  47         int                     qnbytes;        /* number of bytes allocated to this user */
  48 };
  49
  50 #define KEYQUOTA_MAX_KEYS       100
  51 #define KEYQUOTA_MAX_BYTES      10000
  52 #define KEYQUOTA_LINK_BYTES     4               /* a link in a keyring is worth 4 bytes */
  53
  54 extern struct rb_root   key_user_tree;
  55 extern spinlock_t       key_user_lock;
  56 extern struct key_user  root_key_user;
  57
  58 extern struct key_user *key_user_lookup(uid_t uid);
  59 extern void key_user_put(struct key_user *user);
  60
  61
  62
  63 extern struct rb_root key_serial_tree;
  64 extern spinlock_t key_serial_lock;
  65 extern struct semaphore key_alloc_sem;
  66 extern struct rw_semaphore key_construction_sem;
  67 extern wait_queue_head_t request_key_conswq;
  68
  69
  70 extern void keyring_publish_name(struct key *keyring);
  71
  72 extern int __key_link(struct key *keyring, struct key *key);
  73
  74 extern key_ref_t __keyring_search_one(key_ref_t keyring_ref,
  75                                       const struct key_type *type,
  76                                       const char *description,
  77                                       key_perm_t perm);
  78
  79 extern struct key *keyring_search_instkey(struct key *keyring,
  80                                           key_serial_t target_id);
  81
  82 typedef int (*key_match_func_t)(const struct key *, const void *);
  83
  84 extern key_ref_t keyring_search_aux(key_ref_t keyring_ref,
  85                                     struct task_struct *tsk,
  86                                     struct key_type *type,
  87                                     const void *description,
  88                                     key_match_func_t match);
  89
  90 extern key_ref_t search_process_keyrings(struct key_type *type,
  91                                          const void *description,
  92                                          key_match_func_t match,
  93                                          struct task_struct *tsk);
  94
  95 extern struct key *find_keyring_by_name(const char *name, key_serial_t bound);
  96
  97 extern int install_thread_keyring(struct task_struct *tsk);
  98 extern int install_process_keyring(struct task_struct *tsk);
  99
 100 extern struct key *request_key_and_link(struct key_type *type,
 101                                         const char *description,
 102                                         const char *callout_info,
 103                                         struct key *dest_keyring);
 104
 105 /*
 106  * request_key authorisation
 107  */
 108 struct request_key_auth {
 109         struct key              *target_key;
 110         struct task_struct      *context;
 111         pid_t                   pid;
 112 };
 113
 114 extern struct key_type key_type_request_key_auth;
 115 extern struct key *request_key_auth_new(struct key *target,
 116                                         struct key **_rkakey);
 117
 118 extern struct key *key_get_instantiation_authkey(key_serial_t target_id);
 119
 120 /*
 121  * keyctl functions
 122  */
 123 extern long keyctl_get_keyring_ID(key_serial_t, int);
 124 extern long keyctl_join_session_keyring(const char __user *);
 125 extern long keyctl_update_key(key_serial_t, const void __user *, size_t);
 126 extern long keyctl_revoke_key(key_serial_t);
 127 extern long keyctl_keyring_clear(key_serial_t);
 128 extern long keyctl_keyring_link(key_serial_t, key_serial_t);
 129 extern long keyctl_keyring_unlink(key_serial_t, key_serial_t);
 130 extern long keyctl_describe_key(key_serial_t, char __user *, size_t);
 131 extern long keyctl_keyring_search(key_serial_t, const char __user *,
 132                                   const char __user *, key_serial_t);
 133 extern long keyctl_read_key(key_serial_t, char __user *, size_t);
 134 extern long keyctl_chown_key(key_serial_t, uid_t, gid_t);
 135 extern long keyctl_setperm_key(key_serial_t, key_perm_t);
 136 extern long keyctl_instantiate_key(key_serial_t, const void __user *,
 137                                    size_t, key_serial_t);
 138 extern long keyctl_negate_key(key_serial_t, unsigned, key_serial_t);
 139 extern long keyctl_set_reqkey_keyring(int);
 140
 141
 142 /*
 143  * debugging key validation
 144  */
 145 #ifdef KEY_DEBUGGING
 146 extern void __key_check(const struct key *);
 147
 148 static inline void key_check(const struct key *key)
 149 {
 150         if (key && (IS_ERR(key) || key->magic != KEY_DEBUG_MAGIC))
 151                 __key_check(key);
 152 }
 153
 154 #else
 155
 156 #define key_check(key) do {} while(0)
 157
 158 #endif
 159
 160 #endif /* _INTERNAL_H */