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_user;
  29
  30 /*****************************************************************************/
  31 /*
  32  * keep track of keys for a user
  33  * - this needs to be separate to user_struct to avoid a refcount-loop
  34  *   (user_struct pins some keyrings which pin this struct)
  35  * - this also keeps track of keys under request from userspace for this UID
  36  */
  37 struct key_user {
  38         struct rb_node          node;
  39         struct list_head        consq;          /* construction queue */
  40         spinlock_t              lock;
  41         atomic_t                usage;          /* for accessing qnkeys & qnbytes */
  42         atomic_t                nkeys;          /* number of keys */
  43         atomic_t                nikeys;         /* number of instantiated keys */
  44         uid_t                   uid;
  45         int                     qnkeys;         /* number of keys allocated to this user */
  46         int                     qnbytes;        /* number of bytes allocated to this user */
  47 };
  48
  49 #define KEYQUOTA_MAX_KEYS       100
  50 #define KEYQUOTA_MAX_BYTES      10000
  51 #define KEYQUOTA_LINK_BYTES     4               /* a link in a keyring is worth 4 bytes */
  52
  53 extern struct rb_root   key_user_tree;
  54 extern spinlock_t       key_user_lock;
  55 extern struct key_user  root_key_user;
  56
  57 extern struct key_user *key_user_lookup(uid_t uid);
  58 extern void key_user_put(struct key_user *user);
  59
  60
  61
  62 extern struct rb_root key_serial_tree;
  63 extern spinlock_t key_serial_lock;
  64 extern struct semaphore key_alloc_sem;
  65 extern struct rw_semaphore key_construction_sem;
  66 extern wait_queue_head_t request_key_conswq;
  67
  68
  69 extern void keyring_publish_name(struct key *keyring);
  70
  71 extern int __key_link(struct key *keyring, struct key *key);
  72
  73 extern key_ref_t __keyring_search_one(key_ref_t keyring_ref,
  74                                       const struct key_type *type,
  75                                       const char *description,
  76                                       key_perm_t perm);
  77
  78 extern struct key *keyring_search_instkey(struct key *keyring,
  79                                           key_serial_t target_id);
  80
  81 typedef int (*key_match_func_t)(const struct key *, const void *);
  82
  83 extern key_ref_t keyring_search_aux(key_ref_t keyring_ref,
  84                                     struct task_struct *tsk,
  85                                     struct key_type *type,
  86                                     const void *description,
  87                                     key_match_func_t match);
  88
  89 extern key_ref_t search_process_keyrings(struct key_type *type,
  90                                          const void *description,
  91                                          key_match_func_t match,
  92                                          struct task_struct *tsk);
  93
  94 extern struct key *find_keyring_by_name(const char *name, key_serial_t bound);
  95
  96 extern int install_thread_keyring(struct task_struct *tsk);
  97 extern int install_process_keyring(struct task_struct *tsk);
  98
  99 extern struct key *request_key_and_link(struct key_type *type,
 100                                         const char *description,
 101                                         const char *callout_info,
 102                                         struct key *dest_keyring);
 103
 104 /*
 105  * request_key authorisation
 106  */
 107 struct request_key_auth {
 108         struct key              *target_key;
 109         struct task_struct      *context;
 110         const char              *callout_info;
 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                                         const char *callout_info);
 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 extern long keyctl_set_timeout(key_serial_t, unsigned);
 141 extern long keyctl_assume_authority(key_serial_t);
 142
 143
 144 /*
 145  * debugging key validation
 146  */
 147 #ifdef KEY_DEBUGGING
 148 extern void __key_check(const struct key *);
 149
 150 static inline void key_check(const struct key *key)
 151 {
 152         if (key && (IS_ERR(key) || key->magic != KEY_DEBUG_MAGIC))
 153                 __key_check(key);
 154 }
 155
 156 #else
 157
 158 #define key_check(key) do {} while(0)
 159
 160 #endif
 161
 162 #endif /* _INTERNAL_H */