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1/* Authentication token and access key management internal defs
2 *
3 * Copyright (C) 2003-5, 2007 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/sched.h>
16#include <linux/key-type.h>
17
18#ifdef __KDEBUG
19#define kenter(FMT, ...) \
20 printk(KERN_DEBUG "==> %s("FMT")\n", __func__, ##__VA_ARGS__)
21#define kleave(FMT, ...) \
22 printk(KERN_DEBUG "<== %s()"FMT"\n", __func__, ##__VA_ARGS__)
23#define kdebug(FMT, ...) \
24 printk(KERN_DEBUG " "FMT"\n", ##__VA_ARGS__)
25#else
26#define kenter(FMT, ...) \
27 no_printk(KERN_DEBUG "==> %s("FMT")\n", __func__, ##__VA_ARGS__)
28#define kleave(FMT, ...) \
29 no_printk(KERN_DEBUG "<== %s()"FMT"\n", __func__, ##__VA_ARGS__)
30#define kdebug(FMT, ...) \
31 no_printk(KERN_DEBUG FMT"\n", ##__VA_ARGS__)
32#endif
33
34extern struct key_type key_type_dead;
35extern struct key_type key_type_user;
36extern struct key_type key_type_logon;
37
38/*****************************************************************************/
39/*
40 * Keep track of keys for a user.
41 *
42 * This needs to be separate to user_struct to avoid a refcount-loop
43 * (user_struct pins some keyrings which pin this struct).
44 *
45 * We also keep track of keys under request from userspace for this UID here.
46 */
47struct key_user {
48 struct rb_node node;
49 struct mutex cons_lock; /* construction initiation lock */
50 spinlock_t lock;
51 atomic_t usage; /* for accessing qnkeys & qnbytes */
52 atomic_t nkeys; /* number of keys */
53 atomic_t nikeys; /* number of instantiated keys */
54 uid_t uid;
55 struct user_namespace *user_ns;
56 int qnkeys; /* number of keys allocated to this user */
57 int qnbytes; /* number of bytes allocated to this user */
58};
59
60extern struct rb_root key_user_tree;
61extern spinlock_t key_user_lock;
62extern struct key_user root_key_user;
63
64extern struct key_user *key_user_lookup(uid_t uid,
65 struct user_namespace *user_ns);
66extern void key_user_put(struct key_user *user);
67
68/*
69 * Key quota limits.
70 * - root has its own separate limits to everyone else
71 */
72extern unsigned key_quota_root_maxkeys;
73extern unsigned key_quota_root_maxbytes;
74extern unsigned key_quota_maxkeys;
75extern unsigned key_quota_maxbytes;
76
77#define KEYQUOTA_LINK_BYTES 4 /* a link in a keyring is worth 4 bytes */
78
79
80extern struct kmem_cache *key_jar;
81extern struct rb_root key_serial_tree;
82extern spinlock_t key_serial_lock;
83extern struct mutex key_construction_mutex;
84extern wait_queue_head_t request_key_conswq;
85
86
87extern struct key_type *key_type_lookup(const char *type);
88extern void key_type_put(struct key_type *ktype);
89
90extern int __key_link_begin(struct key *keyring,
91 const struct key_type *type,
92 const char *description,
93 unsigned long *_prealloc);
94extern int __key_link_check_live_key(struct key *keyring, struct key *key);
95extern void __key_link(struct key *keyring, struct key *key,
96 unsigned long *_prealloc);
97extern void __key_link_end(struct key *keyring,
98 struct key_type *type,
99 unsigned long prealloc);
100
101extern key_ref_t __keyring_search_one(key_ref_t keyring_ref,
102 const struct key_type *type,
103 const char *description,
104 key_perm_t perm);
105
106extern struct key *keyring_search_instkey(struct key *keyring,
107 key_serial_t target_id);
108
109typedef int (*key_match_func_t)(const struct key *, const void *);
110
111extern key_ref_t keyring_search_aux(key_ref_t keyring_ref,
112 const struct cred *cred,
113 struct key_type *type,
114 const void *description,
115 key_match_func_t match,
116 bool no_state_check);
117
118extern key_ref_t search_my_process_keyrings(struct key_type *type,
119 const void *description,
120 key_match_func_t match,
121 bool no_state_check,
122 const struct cred *cred);
123extern key_ref_t search_process_keyrings(struct key_type *type,
124 const void *description,
125 key_match_func_t match,
126 const struct cred *cred);
127
128extern struct key *find_keyring_by_name(const char *name, bool skip_perm_check);
129
130extern int install_user_keyrings(void);
131extern int install_thread_keyring_to_cred(struct cred *);
132extern int install_process_keyring_to_cred(struct cred *);
133extern int install_session_keyring_to_cred(struct cred *, struct key *);
134
135extern struct key *request_key_and_link(struct key_type *type,
136 const char *description,
137 const void *callout_info,
138 size_t callout_len,
139 void *aux,
140 struct key *dest_keyring,
141 unsigned long flags);
142
143extern int lookup_user_key_possessed(const struct key *key, const void *target);
144extern key_ref_t lookup_user_key(key_serial_t id, unsigned long flags,
145 key_perm_t perm);
146#define KEY_LOOKUP_CREATE 0x01
147#define KEY_LOOKUP_PARTIAL 0x02
148#define KEY_LOOKUP_FOR_UNLINK 0x04
149
150extern long join_session_keyring(const char *name);
151
152extern struct work_struct key_gc_work;
153extern unsigned key_gc_delay;
154extern void keyring_gc(struct key *keyring, time_t limit);
155extern void key_schedule_gc(time_t expiry_at);
156extern void key_gc_keytype(struct key_type *ktype);
157
158extern int key_task_permission(const key_ref_t key_ref,
159 const struct cred *cred,
160 key_perm_t perm);
161
162/*
163 * Check to see whether permission is granted to use a key in the desired way.
164 */
165static inline int key_permission(const key_ref_t key_ref, key_perm_t perm)
166{
167 return key_task_permission(key_ref, current_cred(), perm);
168}
169
170/* required permissions */
171#define KEY_VIEW 0x01 /* require permission to view attributes */
172#define KEY_READ 0x02 /* require permission to read content */
173#define KEY_WRITE 0x04 /* require permission to update / modify */
174#define KEY_SEARCH 0x08 /* require permission to search (keyring) or find (key) */
175#define KEY_LINK 0x10 /* require permission to link */
176#define KEY_SETATTR 0x20 /* require permission to change attributes */
177#define KEY_ALL 0x3f /* all the above permissions */
178
179/*
180 * Authorisation record for request_key().
181 */
182struct request_key_auth {
183 struct key *target_key;
184 struct key *dest_keyring;
185 const struct cred *cred;
186 void *callout_info;
187 size_t callout_len;
188 pid_t pid;
189};
190
191extern struct key_type key_type_request_key_auth;
192extern struct key *request_key_auth_new(struct key *target,
193 const void *callout_info,
194 size_t callout_len,
195 struct key *dest_keyring);
196
197extern struct key *key_get_instantiation_authkey(key_serial_t target_id);
198
199/*
200 * keyctl() functions
201 */
202extern long keyctl_get_keyring_ID(key_serial_t, int);
203extern long keyctl_join_session_keyring(const char __user *);
204extern long keyctl_update_key(key_serial_t, const void __user *, size_t);
205extern long keyctl_revoke_key(key_serial_t);
206extern long keyctl_keyring_clear(key_serial_t);
207extern long keyctl_keyring_link(key_serial_t, key_serial_t);
208extern long keyctl_keyring_unlink(key_serial_t, key_serial_t);
209extern long keyctl_describe_key(key_serial_t, char __user *, size_t);
210extern long keyctl_keyring_search(key_serial_t, const char __user *,
211 const char __user *, key_serial_t);
212extern long keyctl_read_key(key_serial_t, char __user *, size_t);
213extern long keyctl_chown_key(key_serial_t, uid_t, gid_t);
214extern long keyctl_setperm_key(key_serial_t, key_perm_t);
215extern long keyctl_instantiate_key(key_serial_t, const void __user *,
216 size_t, key_serial_t);
217extern long keyctl_negate_key(key_serial_t, unsigned, key_serial_t);
218extern long keyctl_set_reqkey_keyring(int);
219extern long keyctl_set_timeout(key_serial_t, unsigned);
220extern long keyctl_assume_authority(key_serial_t);
221extern long keyctl_get_security(key_serial_t keyid, char __user *buffer,
222 size_t buflen);
223extern long keyctl_session_to_parent(void);
224extern long keyctl_reject_key(key_serial_t, unsigned, unsigned, key_serial_t);
225extern long keyctl_instantiate_key_iov(key_serial_t,
226 const struct iovec __user *,
227 unsigned, key_serial_t);
228
229extern long keyctl_instantiate_key_common(key_serial_t,
230 const struct iovec __user *,
231 unsigned, size_t, key_serial_t);
232
233/*
234 * Debugging key validation
235 */
236#ifdef KEY_DEBUGGING
237extern void __key_check(const struct key *);
238
239static inline void key_check(const struct key *key)
240{
241 if (key && (IS_ERR(key) || key->magic != KEY_DEBUG_MAGIC))
242 __key_check(key);
243}
244
245#else
246
247#define key_check(key) do {} while(0)
248
249#endif
250
251#endif /* _INTERNAL_H */