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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/wait_bit.h>
17#include <linux/cred.h>
18#include <linux/key-type.h>
19#include <linux/task_work.h>
20#include <linux/keyctl.h>
21#include <linux/refcount.h>
22#include <linux/compat.h>
23
24struct iovec;
25
26#ifdef __KDEBUG
27#define kenter(FMT, ...) \
28 printk(KERN_DEBUG "==> %s("FMT")\n", __func__, ##__VA_ARGS__)
29#define kleave(FMT, ...) \
30 printk(KERN_DEBUG "<== %s()"FMT"\n", __func__, ##__VA_ARGS__)
31#define kdebug(FMT, ...) \
32 printk(KERN_DEBUG " "FMT"\n", ##__VA_ARGS__)
33#else
34#define kenter(FMT, ...) \
35 no_printk(KERN_DEBUG "==> %s("FMT")\n", __func__, ##__VA_ARGS__)
36#define kleave(FMT, ...) \
37 no_printk(KERN_DEBUG "<== %s()"FMT"\n", __func__, ##__VA_ARGS__)
38#define kdebug(FMT, ...) \
39 no_printk(KERN_DEBUG FMT"\n", ##__VA_ARGS__)
40#endif
41
42extern struct key_type key_type_dead;
43extern struct key_type key_type_user;
44extern struct key_type key_type_logon;
45
46/*****************************************************************************/
47/*
48 * Keep track of keys for a user.
49 *
50 * This needs to be separate to user_struct to avoid a refcount-loop
51 * (user_struct pins some keyrings which pin this struct).
52 *
53 * We also keep track of keys under request from userspace for this UID here.
54 */
55struct key_user {
56 struct rb_node node;
57 struct mutex cons_lock; /* construction initiation lock */
58 spinlock_t lock;
59 refcount_t usage; /* for accessing qnkeys & qnbytes */
60 atomic_t nkeys; /* number of keys */
61 atomic_t nikeys; /* number of instantiated keys */
62 kuid_t uid;
63 int qnkeys; /* number of keys allocated to this user */
64 int qnbytes; /* number of bytes allocated to this user */
65};
66
67extern struct rb_root key_user_tree;
68extern spinlock_t key_user_lock;
69extern struct key_user root_key_user;
70
71extern struct key_user *key_user_lookup(kuid_t uid);
72extern void key_user_put(struct key_user *user);
73
74/*
75 * Key quota limits.
76 * - root has its own separate limits to everyone else
77 */
78extern unsigned key_quota_root_maxkeys;
79extern unsigned key_quota_root_maxbytes;
80extern unsigned key_quota_maxkeys;
81extern unsigned key_quota_maxbytes;
82
83#define KEYQUOTA_LINK_BYTES 4 /* a link in a keyring is worth 4 bytes */
84
85
86extern struct kmem_cache *key_jar;
87extern struct rb_root key_serial_tree;
88extern spinlock_t key_serial_lock;
89extern struct mutex key_construction_mutex;
90extern wait_queue_head_t request_key_conswq;
91
92
93extern struct key_type *key_type_lookup(const char *type);
94extern void key_type_put(struct key_type *ktype);
95
96extern int __key_link_begin(struct key *keyring,
97 const struct keyring_index_key *index_key,
98 struct assoc_array_edit **_edit);
99extern int __key_link_check_live_key(struct key *keyring, struct key *key);
100extern void __key_link(struct key *key, struct assoc_array_edit **_edit);
101extern void __key_link_end(struct key *keyring,
102 const struct keyring_index_key *index_key,
103 struct assoc_array_edit *edit);
104
105extern key_ref_t find_key_to_update(key_ref_t keyring_ref,
106 const struct keyring_index_key *index_key);
107
108extern struct key *keyring_search_instkey(struct key *keyring,
109 key_serial_t target_id);
110
111extern int iterate_over_keyring(const struct key *keyring,
112 int (*func)(const struct key *key, void *data),
113 void *data);
114
115struct keyring_search_context {
116 struct keyring_index_key index_key;
117 const struct cred *cred;
118 struct key_match_data match_data;
119 unsigned flags;
120#define KEYRING_SEARCH_NO_STATE_CHECK 0x0001 /* Skip state checks */
121#define KEYRING_SEARCH_DO_STATE_CHECK 0x0002 /* Override NO_STATE_CHECK */
122#define KEYRING_SEARCH_NO_UPDATE_TIME 0x0004 /* Don't update times */
123#define KEYRING_SEARCH_NO_CHECK_PERM 0x0008 /* Don't check permissions */
124#define KEYRING_SEARCH_DETECT_TOO_DEEP 0x0010 /* Give an error on excessive depth */
125#define KEYRING_SEARCH_SKIP_EXPIRED 0x0020 /* Ignore expired keys (intention to replace) */
126
127 int (*iterator)(const void *object, void *iterator_data);
128
129 /* Internal stuff */
130 int skipped_ret;
131 bool possessed;
132 key_ref_t result;
133 time64_t now;
134};
135
136extern bool key_default_cmp(const struct key *key,
137 const struct key_match_data *match_data);
138extern key_ref_t keyring_search_aux(key_ref_t keyring_ref,
139 struct keyring_search_context *ctx);
140
141extern key_ref_t search_my_process_keyrings(struct keyring_search_context *ctx);
142extern key_ref_t search_process_keyrings(struct keyring_search_context *ctx);
143
144extern struct key *find_keyring_by_name(const char *name, bool uid_keyring);
145
146extern int install_user_keyrings(void);
147extern int install_thread_keyring_to_cred(struct cred *);
148extern int install_process_keyring_to_cred(struct cred *);
149extern int install_session_keyring_to_cred(struct cred *, struct key *);
150
151extern struct key *request_key_and_link(struct key_type *type,
152 const char *description,
153 const void *callout_info,
154 size_t callout_len,
155 void *aux,
156 struct key *dest_keyring,
157 unsigned long flags);
158
159extern bool lookup_user_key_possessed(const struct key *key,
160 const struct key_match_data *match_data);
161extern key_ref_t lookup_user_key(key_serial_t id, unsigned long flags,
162 key_perm_t perm);
163#define KEY_LOOKUP_CREATE 0x01
164#define KEY_LOOKUP_PARTIAL 0x02
165#define KEY_LOOKUP_FOR_UNLINK 0x04
166
167extern long join_session_keyring(const char *name);
168extern void key_change_session_keyring(struct callback_head *twork);
169
170extern struct work_struct key_gc_work;
171extern unsigned key_gc_delay;
172extern void keyring_gc(struct key *keyring, time64_t limit);
173extern void keyring_restriction_gc(struct key *keyring,
174 struct key_type *dead_type);
175extern void key_schedule_gc(time64_t gc_at);
176extern void key_schedule_gc_links(void);
177extern void key_gc_keytype(struct key_type *ktype);
178
179extern int key_task_permission(const key_ref_t key_ref,
180 const struct cred *cred,
181 key_perm_t perm);
182
183/*
184 * Check to see whether permission is granted to use a key in the desired way.
185 */
186static inline int key_permission(const key_ref_t key_ref, unsigned perm)
187{
188 return key_task_permission(key_ref, current_cred(), perm);
189}
190
191/*
192 * Authorisation record for request_key().
193 */
194struct request_key_auth {
195 struct key *target_key;
196 struct key *dest_keyring;
197 const struct cred *cred;
198 void *callout_info;
199 size_t callout_len;
200 pid_t pid;
201} __randomize_layout;
202
203extern struct key_type key_type_request_key_auth;
204extern struct key *request_key_auth_new(struct key *target,
205 const void *callout_info,
206 size_t callout_len,
207 struct key *dest_keyring);
208
209extern struct key *key_get_instantiation_authkey(key_serial_t target_id);
210
211/*
212 * Determine whether a key is dead.
213 */
214static inline bool key_is_dead(const struct key *key, time64_t limit)
215{
216 return
217 key->flags & ((1 << KEY_FLAG_DEAD) |
218 (1 << KEY_FLAG_INVALIDATED)) ||
219 (key->expiry > 0 && key->expiry <= limit);
220}
221
222/*
223 * keyctl() functions
224 */
225extern long keyctl_get_keyring_ID(key_serial_t, int);
226extern long keyctl_join_session_keyring(const char __user *);
227extern long keyctl_update_key(key_serial_t, const void __user *, size_t);
228extern long keyctl_revoke_key(key_serial_t);
229extern long keyctl_keyring_clear(key_serial_t);
230extern long keyctl_keyring_link(key_serial_t, key_serial_t);
231extern long keyctl_keyring_unlink(key_serial_t, key_serial_t);
232extern long keyctl_describe_key(key_serial_t, char __user *, size_t);
233extern long keyctl_keyring_search(key_serial_t, const char __user *,
234 const char __user *, key_serial_t);
235extern long keyctl_read_key(key_serial_t, char __user *, size_t);
236extern long keyctl_chown_key(key_serial_t, uid_t, gid_t);
237extern long keyctl_setperm_key(key_serial_t, key_perm_t);
238extern long keyctl_instantiate_key(key_serial_t, const void __user *,
239 size_t, key_serial_t);
240extern long keyctl_negate_key(key_serial_t, unsigned, key_serial_t);
241extern long keyctl_set_reqkey_keyring(int);
242extern long keyctl_set_timeout(key_serial_t, unsigned);
243extern long keyctl_assume_authority(key_serial_t);
244extern long keyctl_get_security(key_serial_t keyid, char __user *buffer,
245 size_t buflen);
246extern long keyctl_session_to_parent(void);
247extern long keyctl_reject_key(key_serial_t, unsigned, unsigned, key_serial_t);
248extern long keyctl_instantiate_key_iov(key_serial_t,
249 const struct iovec __user *,
250 unsigned, key_serial_t);
251extern long keyctl_invalidate_key(key_serial_t);
252
253struct iov_iter;
254extern long keyctl_instantiate_key_common(key_serial_t,
255 struct iov_iter *,
256 key_serial_t);
257extern long keyctl_restrict_keyring(key_serial_t id,
258 const char __user *_type,
259 const char __user *_restriction);
260#ifdef CONFIG_PERSISTENT_KEYRINGS
261extern long keyctl_get_persistent(uid_t, key_serial_t);
262extern unsigned persistent_keyring_expiry;
263#else
264static inline long keyctl_get_persistent(uid_t uid, key_serial_t destring)
265{
266 return -EOPNOTSUPP;
267}
268#endif
269
270#ifdef CONFIG_KEY_DH_OPERATIONS
271extern long keyctl_dh_compute(struct keyctl_dh_params __user *, char __user *,
272 size_t, struct keyctl_kdf_params __user *);
273extern long __keyctl_dh_compute(struct keyctl_dh_params __user *, char __user *,
274 size_t, struct keyctl_kdf_params *);
275#ifdef CONFIG_KEYS_COMPAT
276extern long compat_keyctl_dh_compute(struct keyctl_dh_params __user *params,
277 char __user *buffer, size_t buflen,
278 struct compat_keyctl_kdf_params __user *kdf);
279#endif
280#define KEYCTL_KDF_MAX_OUTPUT_LEN 1024 /* max length of KDF output */
281#define KEYCTL_KDF_MAX_OI_LEN 64 /* max length of otherinfo */
282#else
283static inline long keyctl_dh_compute(struct keyctl_dh_params __user *params,
284 char __user *buffer, size_t buflen,
285 struct keyctl_kdf_params __user *kdf)
286{
287 return -EOPNOTSUPP;
288}
289
290#ifdef CONFIG_KEYS_COMPAT
291static inline long compat_keyctl_dh_compute(
292 struct keyctl_dh_params __user *params,
293 char __user *buffer, size_t buflen,
294 struct keyctl_kdf_params __user *kdf)
295{
296 return -EOPNOTSUPP;
297}
298#endif
299#endif
300
301/*
302 * Debugging key validation
303 */
304#ifdef KEY_DEBUGGING
305extern void __key_check(const struct key *);
306
307static inline void key_check(const struct key *key)
308{
309 if (key && (IS_ERR(key) || key->magic != KEY_DEBUG_MAGIC))
310 __key_check(key);
311}
312
313#else
314
315#define key_check(key) do {} while(0)
316
317#endif
318
319#endif /* _INTERNAL_H */