This source file includes following definitions.
- make_key_ref
- key_ref_to_ptr
- is_key_possessed
- __key_get
- key_get
- key_ref_put
- request_key
- key_read_state
- key_is_positive
- key_is_negative
1
2
3
4
5
6
7
8
9
10 #ifndef _LINUX_KEY_H
11 #define _LINUX_KEY_H
12
13 #include <linux/types.h>
14 #include <linux/list.h>
15 #include <linux/rbtree.h>
16 #include <linux/rcupdate.h>
17 #include <linux/sysctl.h>
18 #include <linux/rwsem.h>
19 #include <linux/atomic.h>
20 #include <linux/assoc_array.h>
21 #include <linux/refcount.h>
22 #include <linux/time64.h>
23
24 #ifdef __KERNEL__
25 #include <linux/uidgid.h>
26
27
28 typedef int32_t key_serial_t;
29
30
31 typedef uint32_t key_perm_t;
32
33 struct key;
34 struct net;
35
36 #ifdef CONFIG_KEYS
37
38 #undef KEY_DEBUGGING
39
40 #define KEY_POS_VIEW 0x01000000
41 #define KEY_POS_READ 0x02000000
42 #define KEY_POS_WRITE 0x04000000
43 #define KEY_POS_SEARCH 0x08000000
44 #define KEY_POS_LINK 0x10000000
45 #define KEY_POS_SETATTR 0x20000000
46 #define KEY_POS_ALL 0x3f000000
47
48 #define KEY_USR_VIEW 0x00010000
49 #define KEY_USR_READ 0x00020000
50 #define KEY_USR_WRITE 0x00040000
51 #define KEY_USR_SEARCH 0x00080000
52 #define KEY_USR_LINK 0x00100000
53 #define KEY_USR_SETATTR 0x00200000
54 #define KEY_USR_ALL 0x003f0000
55
56 #define KEY_GRP_VIEW 0x00000100
57 #define KEY_GRP_READ 0x00000200
58 #define KEY_GRP_WRITE 0x00000400
59 #define KEY_GRP_SEARCH 0x00000800
60 #define KEY_GRP_LINK 0x00001000
61 #define KEY_GRP_SETATTR 0x00002000
62 #define KEY_GRP_ALL 0x00003f00
63
64 #define KEY_OTH_VIEW 0x00000001
65 #define KEY_OTH_READ 0x00000002
66 #define KEY_OTH_WRITE 0x00000004
67 #define KEY_OTH_SEARCH 0x00000008
68 #define KEY_OTH_LINK 0x00000010
69 #define KEY_OTH_SETATTR 0x00000020
70 #define KEY_OTH_ALL 0x0000003f
71
72 #define KEY_PERM_UNDEF 0xffffffff
73
74 struct seq_file;
75 struct user_struct;
76 struct signal_struct;
77 struct cred;
78
79 struct key_type;
80 struct key_owner;
81 struct key_tag;
82 struct keyring_list;
83 struct keyring_name;
84
85 struct key_tag {
86 struct rcu_head rcu;
87 refcount_t usage;
88 bool removed;
89 };
90
91 struct keyring_index_key {
92
93 unsigned long hash;
94 union {
95 struct {
96 #ifdef __LITTLE_ENDIAN
97 u16 desc_len;
98 char desc[sizeof(long) - 2];
99 #else
100 char desc[sizeof(long) - 2];
101 u16 desc_len;
102 #endif
103 };
104 unsigned long x;
105 };
106 struct key_type *type;
107 struct key_tag *domain_tag;
108 const char *description;
109 };
110
111 union key_payload {
112 void __rcu *rcu_data0;
113 void *data[4];
114 };
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130 typedef struct __key_reference_with_attributes *key_ref_t;
131
132 static inline key_ref_t make_key_ref(const struct key *key,
133 bool possession)
134 {
135 return (key_ref_t) ((unsigned long) key | possession);
136 }
137
138 static inline struct key *key_ref_to_ptr(const key_ref_t key_ref)
139 {
140 return (struct key *) ((unsigned long) key_ref & ~1UL);
141 }
142
143 static inline bool is_key_possessed(const key_ref_t key_ref)
144 {
145 return (unsigned long) key_ref & 1UL;
146 }
147
148 typedef int (*key_restrict_link_func_t)(struct key *dest_keyring,
149 const struct key_type *type,
150 const union key_payload *payload,
151 struct key *restriction_key);
152
153 struct key_restriction {
154 key_restrict_link_func_t check;
155 struct key *key;
156 struct key_type *keytype;
157 };
158
159 enum key_state {
160 KEY_IS_UNINSTANTIATED,
161 KEY_IS_POSITIVE,
162 };
163
164
165
166
167
168
169
170
171
172 struct key {
173 refcount_t usage;
174 key_serial_t serial;
175 union {
176 struct list_head graveyard_link;
177 struct rb_node serial_node;
178 };
179 struct rw_semaphore sem;
180 struct key_user *user;
181 void *security;
182 union {
183 time64_t expiry;
184 time64_t revoked_at;
185 };
186 time64_t last_used_at;
187 kuid_t uid;
188 kgid_t gid;
189 key_perm_t perm;
190 unsigned short quotalen;
191 unsigned short datalen;
192
193
194
195 short state;
196
197 #ifdef KEY_DEBUGGING
198 unsigned magic;
199 #define KEY_DEBUG_MAGIC 0x18273645u
200 #endif
201
202 unsigned long flags;
203 #define KEY_FLAG_DEAD 0
204 #define KEY_FLAG_REVOKED 1
205 #define KEY_FLAG_IN_QUOTA 2
206 #define KEY_FLAG_USER_CONSTRUCT 3
207 #define KEY_FLAG_ROOT_CAN_CLEAR 4
208 #define KEY_FLAG_INVALIDATED 5
209 #define KEY_FLAG_BUILTIN 6
210 #define KEY_FLAG_ROOT_CAN_INVAL 7
211 #define KEY_FLAG_KEEP 8
212 #define KEY_FLAG_UID_KEYRING 9
213
214
215
216
217
218
219 union {
220 struct keyring_index_key index_key;
221 struct {
222 unsigned long hash;
223 unsigned long len_desc;
224 struct key_type *type;
225 struct key_tag *domain_tag;
226 char *description;
227 };
228 };
229
230
231
232
233
234 union {
235 union key_payload payload;
236 struct {
237
238 struct list_head name_link;
239 struct assoc_array keys;
240 };
241 };
242
243
244
245
246
247
248
249
250
251
252
253
254 struct key_restriction *restrict_link;
255 };
256
257 extern struct key *key_alloc(struct key_type *type,
258 const char *desc,
259 kuid_t uid, kgid_t gid,
260 const struct cred *cred,
261 key_perm_t perm,
262 unsigned long flags,
263 struct key_restriction *restrict_link);
264
265
266 #define KEY_ALLOC_IN_QUOTA 0x0000
267 #define KEY_ALLOC_QUOTA_OVERRUN 0x0001
268 #define KEY_ALLOC_NOT_IN_QUOTA 0x0002
269 #define KEY_ALLOC_BUILT_IN 0x0004
270 #define KEY_ALLOC_BYPASS_RESTRICTION 0x0008
271 #define KEY_ALLOC_UID_KEYRING 0x0010
272
273 extern void key_revoke(struct key *key);
274 extern void key_invalidate(struct key *key);
275 extern void key_put(struct key *key);
276 extern bool key_put_tag(struct key_tag *tag);
277 extern void key_remove_domain(struct key_tag *domain_tag);
278
279 static inline struct key *__key_get(struct key *key)
280 {
281 refcount_inc(&key->usage);
282 return key;
283 }
284
285 static inline struct key *key_get(struct key *key)
286 {
287 return key ? __key_get(key) : key;
288 }
289
290 static inline void key_ref_put(key_ref_t key_ref)
291 {
292 key_put(key_ref_to_ptr(key_ref));
293 }
294
295 extern struct key *request_key_tag(struct key_type *type,
296 const char *description,
297 struct key_tag *domain_tag,
298 const char *callout_info);
299
300 extern struct key *request_key_rcu(struct key_type *type,
301 const char *description,
302 struct key_tag *domain_tag);
303
304 extern struct key *request_key_with_auxdata(struct key_type *type,
305 const char *description,
306 struct key_tag *domain_tag,
307 const void *callout_info,
308 size_t callout_len,
309 void *aux);
310
311
312
313
314
315
316
317
318
319 static inline struct key *request_key(struct key_type *type,
320 const char *description,
321 const char *callout_info)
322 {
323 return request_key_tag(type, description, NULL, callout_info);
324 }
325
326 #ifdef CONFIG_NET
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342 #define request_key_net(type, description, net, callout_info) \
343 request_key_tag(type, description, net->key_domain, callout_info);
344
345
346
347
348
349
350
351
352
353
354 #define request_key_net_rcu(type, description, net) \
355 request_key_rcu(type, description, net->key_domain);
356 #endif
357
358 extern int wait_for_key_construction(struct key *key, bool intr);
359
360 extern int key_validate(const struct key *key);
361
362 extern key_ref_t key_create_or_update(key_ref_t keyring,
363 const char *type,
364 const char *description,
365 const void *payload,
366 size_t plen,
367 key_perm_t perm,
368 unsigned long flags);
369
370 extern int key_update(key_ref_t key,
371 const void *payload,
372 size_t plen);
373
374 extern int key_link(struct key *keyring,
375 struct key *key);
376
377 extern int key_move(struct key *key,
378 struct key *from_keyring,
379 struct key *to_keyring,
380 unsigned int flags);
381
382 extern int key_unlink(struct key *keyring,
383 struct key *key);
384
385 extern struct key *keyring_alloc(const char *description, kuid_t uid, kgid_t gid,
386 const struct cred *cred,
387 key_perm_t perm,
388 unsigned long flags,
389 struct key_restriction *restrict_link,
390 struct key *dest);
391
392 extern int restrict_link_reject(struct key *keyring,
393 const struct key_type *type,
394 const union key_payload *payload,
395 struct key *restriction_key);
396
397 extern int keyring_clear(struct key *keyring);
398
399 extern key_ref_t keyring_search(key_ref_t keyring,
400 struct key_type *type,
401 const char *description,
402 bool recurse);
403
404 extern int keyring_add_key(struct key *keyring,
405 struct key *key);
406
407 extern int keyring_restrict(key_ref_t keyring, const char *type,
408 const char *restriction);
409
410 extern struct key *key_lookup(key_serial_t id);
411
412 static inline key_serial_t key_serial(const struct key *key)
413 {
414 return key ? key->serial : 0;
415 }
416
417 extern void key_set_timeout(struct key *, unsigned);
418
419 extern key_ref_t lookup_user_key(key_serial_t id, unsigned long flags,
420 key_perm_t perm);
421 extern void key_free_user_ns(struct user_namespace *);
422
423
424
425
426 #define KEY_NEED_VIEW 0x01
427 #define KEY_NEED_READ 0x02
428 #define KEY_NEED_WRITE 0x04
429 #define KEY_NEED_SEARCH 0x08
430 #define KEY_NEED_LINK 0x10
431 #define KEY_NEED_SETATTR 0x20
432 #define KEY_NEED_ALL 0x3f
433
434 static inline short key_read_state(const struct key *key)
435 {
436
437 return smp_load_acquire(&key->state);
438 }
439
440
441
442
443
444
445
446
447 static inline bool key_is_positive(const struct key *key)
448 {
449 return key_read_state(key) == KEY_IS_POSITIVE;
450 }
451
452 static inline bool key_is_negative(const struct key *key)
453 {
454 return key_read_state(key) < 0;
455 }
456
457 #define dereference_key_rcu(KEY) \
458 (rcu_dereference((KEY)->payload.rcu_data0))
459
460 #define dereference_key_locked(KEY) \
461 (rcu_dereference_protected((KEY)->payload.rcu_data0, \
462 rwsem_is_locked(&((struct key *)(KEY))->sem)))
463
464 #define rcu_assign_keypointer(KEY, PAYLOAD) \
465 do { \
466 rcu_assign_pointer((KEY)->payload.rcu_data0, (PAYLOAD)); \
467 } while (0)
468
469 #ifdef CONFIG_SYSCTL
470 extern struct ctl_table key_sysctls[];
471 #endif
472
473
474
475 extern int install_thread_keyring_to_cred(struct cred *cred);
476 extern void key_fsuid_changed(struct cred *new_cred);
477 extern void key_fsgid_changed(struct cred *new_cred);
478 extern void key_init(void);
479
480 #else
481
482 #define key_validate(k) 0
483 #define key_serial(k) 0
484 #define key_get(k) ({ NULL; })
485 #define key_revoke(k) do { } while(0)
486 #define key_invalidate(k) do { } while(0)
487 #define key_put(k) do { } while(0)
488 #define key_ref_put(k) do { } while(0)
489 #define make_key_ref(k, p) NULL
490 #define key_ref_to_ptr(k) NULL
491 #define is_key_possessed(k) 0
492 #define key_fsuid_changed(c) do { } while(0)
493 #define key_fsgid_changed(c) do { } while(0)
494 #define key_init() do { } while(0)
495 #define key_free_user_ns(ns) do { } while(0)
496 #define key_remove_domain(d) do { } while(0)
497
498 #endif
499 #endif
500 #endif