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KEYS: Add KEYCTL_DH_COMPUTE command
[mirror_ubuntu-zesty-kernel.git] / security / keys / internal.h
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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#include <linux/task_work.h>
18#include <linux/keyctl.h>
19
20struct iovec;
21
22#ifdef __KDEBUG
23#define kenter(FMT, ...) \
24 printk(KERN_DEBUG "==> %s("FMT")\n", __func__, ##__VA_ARGS__)
25#define kleave(FMT, ...) \
26 printk(KERN_DEBUG "<== %s()"FMT"\n", __func__, ##__VA_ARGS__)
27#define kdebug(FMT, ...) \
28 printk(KERN_DEBUG " "FMT"\n", ##__VA_ARGS__)
29#else
30#define kenter(FMT, ...) \
31 no_printk(KERN_DEBUG "==> %s("FMT")\n", __func__, ##__VA_ARGS__)
32#define kleave(FMT, ...) \
33 no_printk(KERN_DEBUG "<== %s()"FMT"\n", __func__, ##__VA_ARGS__)
34#define kdebug(FMT, ...) \
35 no_printk(KERN_DEBUG FMT"\n", ##__VA_ARGS__)
36#endif
37
38extern struct key_type key_type_dead;
39extern struct key_type key_type_user;
40extern struct key_type key_type_logon;
41
42/*****************************************************************************/
43/*
44 * Keep track of keys for a user.
45 *
46 * This needs to be separate to user_struct to avoid a refcount-loop
47 * (user_struct pins some keyrings which pin this struct).
48 *
49 * We also keep track of keys under request from userspace for this UID here.
50 */
51struct key_user {
52 struct rb_node node;
53 struct mutex cons_lock; /* construction initiation lock */
54 spinlock_t lock;
55 atomic_t usage; /* for accessing qnkeys & qnbytes */
56 atomic_t nkeys; /* number of keys */
57 atomic_t nikeys; /* number of instantiated keys */
58 kuid_t uid;
59 int qnkeys; /* number of keys allocated to this user */
60 int qnbytes; /* number of bytes allocated to this user */
61};
62
63extern struct rb_root key_user_tree;
64extern spinlock_t key_user_lock;
65extern struct key_user root_key_user;
66
67extern struct key_user *key_user_lookup(kuid_t uid);
68extern void key_user_put(struct key_user *user);
69
70/*
71 * Key quota limits.
72 * - root has its own separate limits to everyone else
73 */
74extern unsigned key_quota_root_maxkeys;
75extern unsigned key_quota_root_maxbytes;
76extern unsigned key_quota_maxkeys;
77extern unsigned key_quota_maxbytes;
78
79#define KEYQUOTA_LINK_BYTES 4 /* a link in a keyring is worth 4 bytes */
80
81
82extern struct kmem_cache *key_jar;
83extern struct rb_root key_serial_tree;
84extern spinlock_t key_serial_lock;
85extern struct mutex key_construction_mutex;
86extern wait_queue_head_t request_key_conswq;
87
88
89extern struct key_type *key_type_lookup(const char *type);
90extern void key_type_put(struct key_type *ktype);
91
92extern int __key_link_begin(struct key *keyring,
93 const struct keyring_index_key *index_key,
94 struct assoc_array_edit **_edit);
95extern int __key_link_check_live_key(struct key *keyring, struct key *key);
96extern void __key_link(struct key *key, struct assoc_array_edit **_edit);
97extern void __key_link_end(struct key *keyring,
98 const struct keyring_index_key *index_key,
99 struct assoc_array_edit *edit);
100
101extern key_ref_t find_key_to_update(key_ref_t keyring_ref,
102 const struct keyring_index_key *index_key);
103
104extern struct key *keyring_search_instkey(struct key *keyring,
105 key_serial_t target_id);
106
107extern int iterate_over_keyring(const struct key *keyring,
108 int (*func)(const struct key *key, void *data),
109 void *data);
110
111struct keyring_search_context {
112 struct keyring_index_key index_key;
113 const struct cred *cred;
114 struct key_match_data match_data;
115 unsigned flags;
116#define KEYRING_SEARCH_NO_STATE_CHECK 0x0001 /* Skip state checks */
117#define KEYRING_SEARCH_DO_STATE_CHECK 0x0002 /* Override NO_STATE_CHECK */
118#define KEYRING_SEARCH_NO_UPDATE_TIME 0x0004 /* Don't update times */
119#define KEYRING_SEARCH_NO_CHECK_PERM 0x0008 /* Don't check permissions */
120#define KEYRING_SEARCH_DETECT_TOO_DEEP 0x0010 /* Give an error on excessive depth */
121#define KEYRING_SEARCH_SKIP_EXPIRED 0x0020 /* Ignore expired keys (intention to replace) */
122
123 int (*iterator)(const void *object, void *iterator_data);
124
125 /* Internal stuff */
126 int skipped_ret;
127 bool possessed;
128 key_ref_t result;
129 struct timespec now;
130};
131
132extern bool key_default_cmp(const struct key *key,
133 const struct key_match_data *match_data);
134extern key_ref_t keyring_search_aux(key_ref_t keyring_ref,
135 struct keyring_search_context *ctx);
136
137extern key_ref_t search_my_process_keyrings(struct keyring_search_context *ctx);
138extern key_ref_t search_process_keyrings(struct keyring_search_context *ctx);
139
140extern struct key *find_keyring_by_name(const char *name, bool skip_perm_check);
141
142extern int install_user_keyrings(void);
143extern int install_thread_keyring_to_cred(struct cred *);
144extern int install_process_keyring_to_cred(struct cred *);
145extern int install_session_keyring_to_cred(struct cred *, struct key *);
146
147extern struct key *request_key_and_link(struct key_type *type,
148 const char *description,
149 const void *callout_info,
150 size_t callout_len,
151 void *aux,
152 struct key *dest_keyring,
153 unsigned long flags);
154
155extern bool lookup_user_key_possessed(const struct key *key,
156 const struct key_match_data *match_data);
157extern key_ref_t lookup_user_key(key_serial_t id, unsigned long flags,
158 key_perm_t perm);
159#define KEY_LOOKUP_CREATE 0x01
160#define KEY_LOOKUP_PARTIAL 0x02
161#define KEY_LOOKUP_FOR_UNLINK 0x04
162
163extern long join_session_keyring(const char *name);
164extern void key_change_session_keyring(struct callback_head *twork);
165
166extern struct work_struct key_gc_work;
167extern unsigned key_gc_delay;
168extern void keyring_gc(struct key *keyring, time_t limit);
169extern void key_schedule_gc(time_t gc_at);
170extern void key_schedule_gc_links(void);
171extern void key_gc_keytype(struct key_type *ktype);
172
173extern int key_task_permission(const key_ref_t key_ref,
174 const struct cred *cred,
175 key_perm_t perm);
176
177/*
178 * Check to see whether permission is granted to use a key in the desired way.
179 */
180static inline int key_permission(const key_ref_t key_ref, unsigned perm)
181{
182 return key_task_permission(key_ref, current_cred(), perm);
183}
184
185/*
186 * Authorisation record for request_key().
187 */
188struct request_key_auth {
189 struct key *target_key;
190 struct key *dest_keyring;
191 const struct cred *cred;
192 void *callout_info;
193 size_t callout_len;
194 pid_t pid;
195};
196
197extern struct key_type key_type_request_key_auth;
198extern struct key *request_key_auth_new(struct key *target,
199 const void *callout_info,
200 size_t callout_len,
201 struct key *dest_keyring);
202
203extern struct key *key_get_instantiation_authkey(key_serial_t target_id);
204
205/*
206 * Determine whether a key is dead.
207 */
208static inline bool key_is_dead(const struct key *key, time_t limit)
209{
210 return
211 key->flags & ((1 << KEY_FLAG_DEAD) |
212 (1 << KEY_FLAG_INVALIDATED)) ||
213 (key->expiry > 0 && key->expiry <= limit);
214}
215
216/*
217 * keyctl() functions
218 */
219extern long keyctl_get_keyring_ID(key_serial_t, int);
220extern long keyctl_join_session_keyring(const char __user *);
221extern long keyctl_update_key(key_serial_t, const void __user *, size_t);
222extern long keyctl_revoke_key(key_serial_t);
223extern long keyctl_keyring_clear(key_serial_t);
224extern long keyctl_keyring_link(key_serial_t, key_serial_t);
225extern long keyctl_keyring_unlink(key_serial_t, key_serial_t);
226extern long keyctl_describe_key(key_serial_t, char __user *, size_t);
227extern long keyctl_keyring_search(key_serial_t, const char __user *,
228 const char __user *, key_serial_t);
229extern long keyctl_read_key(key_serial_t, char __user *, size_t);
230extern long keyctl_chown_key(key_serial_t, uid_t, gid_t);
231extern long keyctl_setperm_key(key_serial_t, key_perm_t);
232extern long keyctl_instantiate_key(key_serial_t, const void __user *,
233 size_t, key_serial_t);
234extern long keyctl_negate_key(key_serial_t, unsigned, key_serial_t);
235extern long keyctl_set_reqkey_keyring(int);
236extern long keyctl_set_timeout(key_serial_t, unsigned);
237extern long keyctl_assume_authority(key_serial_t);
238extern long keyctl_get_security(key_serial_t keyid, char __user *buffer,
239 size_t buflen);
240extern long keyctl_session_to_parent(void);
241extern long keyctl_reject_key(key_serial_t, unsigned, unsigned, key_serial_t);
242extern long keyctl_instantiate_key_iov(key_serial_t,
243 const struct iovec __user *,
244 unsigned, key_serial_t);
245extern long keyctl_invalidate_key(key_serial_t);
246
247struct iov_iter;
248extern long keyctl_instantiate_key_common(key_serial_t,
249 struct iov_iter *,
250 key_serial_t);
251#ifdef CONFIG_PERSISTENT_KEYRINGS
252extern long keyctl_get_persistent(uid_t, key_serial_t);
253extern unsigned persistent_keyring_expiry;
254#else
255static inline long keyctl_get_persistent(uid_t uid, key_serial_t destring)
256{
257 return -EOPNOTSUPP;
258}
259#endif
260
261#ifdef CONFIG_KEY_DH_OPERATIONS
262extern long keyctl_dh_compute(struct keyctl_dh_params __user *, char __user *,
263 size_t);
264#else
265static inline long keyctl_dh_compute(struct keyctl_dh_params __user *params,
266 char __user *buffer, size_t buflen)
267{
268 return -EOPNOTSUPP;
269}
270#endif
271
272/*
273 * Debugging key validation
274 */
275#ifdef KEY_DEBUGGING
276extern void __key_check(const struct key *);
277
278static inline void key_check(const struct key *key)
279{
280 if (key && (IS_ERR(key) || key->magic != KEY_DEBUG_MAGIC))
281 __key_check(key);
282}
283
284#else
285
286#define key_check(key) do {} while(0)
287
288#endif
289
290#endif /* _INTERNAL_H */
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