Commit | Line | Data |
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2874c5fd | 1 | /* SPDX-License-Identifier: GPL-2.0-or-later */ |
76181c13 | 2 | /* Authentication token and access key management |
1da177e4 | 3 | * |
76181c13 | 4 | * Copyright (C) 2004, 2007 Red Hat, Inc. All Rights Reserved. |
1da177e4 LT |
5 | * Written by David Howells (dhowells@redhat.com) |
6 | * | |
b68101a1 | 7 | * See Documentation/security/keys/core.rst for information on keys/keyrings. |
1da177e4 LT |
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> | |
76d8aeab | 16 | #include <linux/rcupdate.h> |
0b77f5bf | 17 | #include <linux/sysctl.h> |
aa84442d | 18 | #include <linux/rwsem.h> |
60063497 | 19 | #include <linux/atomic.h> |
b2a4df20 | 20 | #include <linux/assoc_array.h> |
fff29291 | 21 | #include <linux/refcount.h> |
074d5898 | 22 | #include <linux/time64.h> |
1da177e4 LT |
23 | |
24 | #ifdef __KERNEL__ | |
9a56c2db | 25 | #include <linux/uidgid.h> |
1da177e4 LT |
26 | |
27 | /* key handle serial number */ | |
28 | typedef int32_t key_serial_t; | |
29 | ||
028db3e2 LT |
30 | /* key handle permissions mask */ |
31 | typedef uint32_t key_perm_t; | |
32 | ||
1da177e4 | 33 | struct key; |
a58946c1 | 34 | struct net; |
1da177e4 LT |
35 | |
36 | #ifdef CONFIG_KEYS | |
37 | ||
2e12256b | 38 | #undef KEY_DEBUGGING |
6b79ccb5 | 39 | |
028db3e2 LT |
40 | #define KEY_POS_VIEW 0x01000000 /* possessor can view a key's attributes */ |
41 | #define KEY_POS_READ 0x02000000 /* possessor can read key payload / view keyring */ | |
42 | #define KEY_POS_WRITE 0x04000000 /* possessor can update key payload / add link to keyring */ | |
43 | #define KEY_POS_SEARCH 0x08000000 /* possessor can find a key in search / search a keyring */ | |
44 | #define KEY_POS_LINK 0x10000000 /* possessor can create a link to a key/keyring */ | |
45 | #define KEY_POS_SETATTR 0x20000000 /* possessor can set key attributes */ | |
46 | #define KEY_POS_ALL 0x3f000000 | |
47 | ||
48 | #define KEY_USR_VIEW 0x00010000 /* user permissions... */ | |
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 /* group permissions... */ | |
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 /* third party permissions... */ | |
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 | ||
8c0637e9 DH |
74 | /* |
75 | * The permissions required on a key that we're looking up. | |
76 | */ | |
77 | enum key_need_perm { | |
78 | KEY_NEED_UNSPECIFIED, /* Needed permission unspecified */ | |
79 | KEY_NEED_VIEW, /* Require permission to view attributes */ | |
80 | KEY_NEED_READ, /* Require permission to read content */ | |
81 | KEY_NEED_WRITE, /* Require permission to update / modify */ | |
82 | KEY_NEED_SEARCH, /* Require permission to search (keyring) or find (key) */ | |
83 | KEY_NEED_LINK, /* Require permission to link */ | |
84 | KEY_NEED_SETATTR, /* Require permission to change attributes */ | |
85 | KEY_NEED_UNLINK, /* Require permission to unlink key */ | |
86 | KEY_SYSADMIN_OVERRIDE, /* Special: override by CAP_SYS_ADMIN */ | |
87 | KEY_AUTHTOKEN_OVERRIDE, /* Special: override by possession of auth token */ | |
88 | KEY_DEFER_PERM_CHECK, /* Special: permission check is deferred */ | |
89 | }; | |
90 | ||
90fd8f26 RS |
91 | enum key_lookup_flag { |
92 | KEY_LOOKUP_CREATE = 0x01, | |
93 | KEY_LOOKUP_PARTIAL = 0x02, | |
94 | KEY_LOOKUP_ALL = (KEY_LOOKUP_CREATE | KEY_LOOKUP_PARTIAL), | |
95 | }; | |
96 | ||
1da177e4 LT |
97 | struct seq_file; |
98 | struct user_struct; | |
99 | struct signal_struct; | |
d84f4f99 | 100 | struct cred; |
1da177e4 LT |
101 | |
102 | struct key_type; | |
103 | struct key_owner; | |
3b6e4de0 | 104 | struct key_tag; |
1da177e4 LT |
105 | struct keyring_list; |
106 | struct keyring_name; | |
107 | ||
3b6e4de0 DH |
108 | struct key_tag { |
109 | struct rcu_head rcu; | |
110 | refcount_t usage; | |
111 | bool removed; /* T when subject removed */ | |
112 | }; | |
113 | ||
16feef43 | 114 | struct keyring_index_key { |
355ef8e1 DH |
115 | /* [!] If this structure is altered, the union in struct key must change too! */ |
116 | unsigned long hash; /* Hash value */ | |
f771fde8 DH |
117 | union { |
118 | struct { | |
119 | #ifdef __LITTLE_ENDIAN /* Put desc_len at the LSB of x */ | |
555df336 DH |
120 | u16 desc_len; |
121 | char desc[sizeof(long) - 2]; /* First few chars of description */ | |
f771fde8 | 122 | #else |
555df336 DH |
123 | char desc[sizeof(long) - 2]; /* First few chars of description */ |
124 | u16 desc_len; | |
f771fde8 DH |
125 | #endif |
126 | }; | |
127 | unsigned long x; | |
128 | }; | |
16feef43 | 129 | struct key_type *type; |
3b6e4de0 | 130 | struct key_tag *domain_tag; /* Domain of operation */ |
16feef43 | 131 | const char *description; |
16feef43 DH |
132 | }; |
133 | ||
146aa8b1 DH |
134 | union key_payload { |
135 | void __rcu *rcu_data0; | |
136 | void *data[4]; | |
137 | }; | |
138 | ||
664cceb0 DH |
139 | /*****************************************************************************/ |
140 | /* | |
141 | * key reference with possession attribute handling | |
142 | * | |
143 | * NOTE! key_ref_t is a typedef'd pointer to a type that is not actually | |
144 | * defined. This is because we abuse the bottom bit of the reference to carry a | |
145 | * flag to indicate whether the calling process possesses that key in one of | |
146 | * its keyrings. | |
147 | * | |
148 | * the key_ref_t has been made a separate type so that the compiler can reject | |
149 | * attempts to dereference it without proper conversion. | |
150 | * | |
151 | * the three functions are used to assemble and disassemble references | |
152 | */ | |
153 | typedef struct __key_reference_with_attributes *key_ref_t; | |
154 | ||
155 | static inline key_ref_t make_key_ref(const struct key *key, | |
a5b4bd28 | 156 | bool possession) |
664cceb0 DH |
157 | { |
158 | return (key_ref_t) ((unsigned long) key | possession); | |
159 | } | |
160 | ||
161 | static inline struct key *key_ref_to_ptr(const key_ref_t key_ref) | |
162 | { | |
163 | return (struct key *) ((unsigned long) key_ref & ~1UL); | |
164 | } | |
165 | ||
a5b4bd28 | 166 | static inline bool is_key_possessed(const key_ref_t key_ref) |
664cceb0 DH |
167 | { |
168 | return (unsigned long) key_ref & 1UL; | |
169 | } | |
170 | ||
aaf66c88 | 171 | typedef int (*key_restrict_link_func_t)(struct key *dest_keyring, |
469ff8f7 | 172 | const struct key_type *type, |
aaf66c88 MM |
173 | const union key_payload *payload, |
174 | struct key *restriction_key); | |
469ff8f7 | 175 | |
e9cc0f68 MM |
176 | struct key_restriction { |
177 | key_restrict_link_func_t check; | |
178 | struct key *key; | |
179 | struct key_type *keytype; | |
180 | }; | |
181 | ||
363b02da DH |
182 | enum key_state { |
183 | KEY_IS_UNINSTANTIATED, | |
184 | KEY_IS_POSITIVE, /* Positively instantiated */ | |
185 | }; | |
186 | ||
1da177e4 LT |
187 | /*****************************************************************************/ |
188 | /* | |
189 | * authentication token / access credential / keyring | |
190 | * - types of key include: | |
191 | * - keyrings | |
192 | * - disk encryption IDs | |
193 | * - Kerberos TGTs and tickets | |
194 | */ | |
195 | struct key { | |
fff29291 | 196 | refcount_t usage; /* number of references */ |
1da177e4 | 197 | key_serial_t serial; /* key serial number */ |
65d87fe6 DH |
198 | union { |
199 | struct list_head graveyard_link; | |
200 | struct rb_node serial_node; | |
201 | }; | |
f7e47677 DH |
202 | #ifdef CONFIG_KEY_NOTIFICATIONS |
203 | struct watch_list *watchers; /* Entities watching this key for changes */ | |
204 | #endif | |
1da177e4 LT |
205 | struct rw_semaphore sem; /* change vs change sem */ |
206 | struct key_user *user; /* owner of this key */ | |
29db9190 | 207 | void *security; /* security data for this key */ |
5d135440 | 208 | union { |
074d5898 BW |
209 | time64_t expiry; /* time at which key expires (or 0) */ |
210 | time64_t revoked_at; /* time at which key was revoked */ | |
5d135440 | 211 | }; |
074d5898 | 212 | time64_t last_used_at; /* last time used for LRU keyring discard */ |
9a56c2db EB |
213 | kuid_t uid; |
214 | kgid_t gid; | |
028db3e2 | 215 | key_perm_t perm; /* access permissions */ |
1da177e4 | 216 | unsigned short quotalen; /* length added to quota */ |
76d8aeab DH |
217 | unsigned short datalen; /* payload data length |
218 | * - may not match RCU dereferenced payload | |
219 | * - payload should contain own length | |
220 | */ | |
363b02da | 221 | short state; /* Key state (+) or rejection error (-) */ |
1da177e4 LT |
222 | |
223 | #ifdef KEY_DEBUGGING | |
224 | unsigned magic; | |
225 | #define KEY_DEBUG_MAGIC 0x18273645u | |
1da177e4 LT |
226 | #endif |
227 | ||
76d8aeab | 228 | unsigned long flags; /* status flags (change with bitops) */ |
363b02da DH |
229 | #define KEY_FLAG_DEAD 0 /* set if key type has been deleted */ |
230 | #define KEY_FLAG_REVOKED 1 /* set if key had been revoked */ | |
231 | #define KEY_FLAG_IN_QUOTA 2 /* set if key consumes quota */ | |
232 | #define KEY_FLAG_USER_CONSTRUCT 3 /* set if key is being constructed in userspace */ | |
233 | #define KEY_FLAG_ROOT_CAN_CLEAR 4 /* set if key can be cleared by root without permission */ | |
234 | #define KEY_FLAG_INVALIDATED 5 /* set if key has been invalidated */ | |
235 | #define KEY_FLAG_BUILTIN 6 /* set if key is built in to the kernel */ | |
236 | #define KEY_FLAG_ROOT_CAN_INVAL 7 /* set if key can be invalidated by root without permission */ | |
237 | #define KEY_FLAG_KEEP 8 /* set if key should not be removed */ | |
238 | #define KEY_FLAG_UID_KEYRING 9 /* set if key is a user or user session keyring */ | |
76d8aeab | 239 | |
16feef43 DH |
240 | /* the key type and key description string |
241 | * - the desc is used to match a key against search criteria | |
242 | * - it should be a printable string | |
1da177e4 LT |
243 | * - eg: for krb5 AFS, this might be "afs@REDHAT.COM" |
244 | */ | |
16feef43 DH |
245 | union { |
246 | struct keyring_index_key index_key; | |
247 | struct { | |
355ef8e1 | 248 | unsigned long hash; |
f771fde8 | 249 | unsigned long len_desc; |
16feef43 | 250 | struct key_type *type; /* type of key */ |
3b6e4de0 | 251 | struct key_tag *domain_tag; /* Domain of operation */ |
16feef43 DH |
252 | char *description; |
253 | }; | |
254 | }; | |
1da177e4 | 255 | |
1da177e4 LT |
256 | /* key data |
257 | * - this is used to hold the data actually used in cryptography or | |
258 | * whatever | |
259 | */ | |
260 | union { | |
146aa8b1 DH |
261 | union key_payload payload; |
262 | struct { | |
263 | /* Keyring bits */ | |
264 | struct list_head name_link; | |
265 | struct assoc_array keys; | |
266 | }; | |
b2a4df20 | 267 | }; |
5ac7eace DH |
268 | |
269 | /* This is set on a keyring to restrict the addition of a link to a key | |
2b6aa412 | 270 | * to it. If this structure isn't provided then it is assumed that the |
5ac7eace | 271 | * keyring is open to any addition. It is ignored for non-keyring |
6563c91f MM |
272 | * keys. Only set this value using keyring_restrict(), keyring_alloc(), |
273 | * or key_alloc(). | |
5ac7eace DH |
274 | * |
275 | * This is intended for use with rings of trusted keys whereby addition | |
276 | * to the keyring needs to be controlled. KEY_ALLOC_BYPASS_RESTRICTION | |
277 | * overrides this, allowing the kernel to add extra keys without | |
278 | * restriction. | |
279 | */ | |
2b6aa412 | 280 | struct key_restriction *restrict_link; |
1da177e4 LT |
281 | }; |
282 | ||
1da177e4 LT |
283 | extern struct key *key_alloc(struct key_type *type, |
284 | const char *desc, | |
9a56c2db | 285 | kuid_t uid, kgid_t gid, |
d84f4f99 | 286 | const struct cred *cred, |
028db3e2 | 287 | key_perm_t perm, |
5ac7eace | 288 | unsigned long flags, |
2b6aa412 | 289 | struct key_restriction *restrict_link); |
7e047ef5 DH |
290 | |
291 | ||
5ac7eace DH |
292 | #define KEY_ALLOC_IN_QUOTA 0x0000 /* add to quota, reject if would overrun */ |
293 | #define KEY_ALLOC_QUOTA_OVERRUN 0x0001 /* add to quota, permit even if overrun */ | |
294 | #define KEY_ALLOC_NOT_IN_QUOTA 0x0002 /* not in quota */ | |
77f68bac DH |
295 | #define KEY_ALLOC_BUILT_IN 0x0004 /* Key is built into kernel */ |
296 | #define KEY_ALLOC_BYPASS_RESTRICTION 0x0008 /* Override the check on restricted keyrings */ | |
237bbd29 | 297 | #define KEY_ALLOC_UID_KEYRING 0x0010 /* allocating a user or user session keyring */ |
4993e1f9 | 298 | #define KEY_ALLOC_SET_KEEP 0x0020 /* Set the KEEP flag on the key/keyring */ |
7e047ef5 | 299 | |
1da177e4 | 300 | extern void key_revoke(struct key *key); |
fd75815f | 301 | extern void key_invalidate(struct key *key); |
1da177e4 | 302 | extern void key_put(struct key *key); |
3b6e4de0 | 303 | extern bool key_put_tag(struct key_tag *tag); |
218e6424 | 304 | extern void key_remove_domain(struct key_tag *domain_tag); |
1da177e4 | 305 | |
ccc3e6d9 | 306 | static inline struct key *__key_get(struct key *key) |
1da177e4 | 307 | { |
fff29291 | 308 | refcount_inc(&key->usage); |
1da177e4 LT |
309 | return key; |
310 | } | |
311 | ||
ccc3e6d9 DH |
312 | static inline struct key *key_get(struct key *key) |
313 | { | |
314 | return key ? __key_get(key) : key; | |
315 | } | |
316 | ||
664cceb0 DH |
317 | static inline void key_ref_put(key_ref_t key_ref) |
318 | { | |
319 | key_put(key_ref_to_ptr(key_ref)); | |
320 | } | |
321 | ||
a58946c1 DH |
322 | extern struct key *request_key_tag(struct key_type *type, |
323 | const char *description, | |
324 | struct key_tag *domain_tag, | |
028db3e2 | 325 | const char *callout_info); |
1da177e4 | 326 | |
896f1950 | 327 | extern struct key *request_key_rcu(struct key_type *type, |
a58946c1 DH |
328 | const char *description, |
329 | struct key_tag *domain_tag); | |
896f1950 | 330 | |
4e54f085 DH |
331 | extern struct key *request_key_with_auxdata(struct key_type *type, |
332 | const char *description, | |
a58946c1 | 333 | struct key_tag *domain_tag, |
4a38e122 DH |
334 | const void *callout_info, |
335 | size_t callout_len, | |
028db3e2 | 336 | void *aux); |
76181c13 | 337 | |
a58946c1 DH |
338 | /** |
339 | * request_key - Request a key and wait for construction | |
340 | * @type: Type of key. | |
341 | * @description: The searchable description of the key. | |
342 | * @callout_info: The data to pass to the instantiation upcall (or NULL). | |
343 | * | |
344 | * As for request_key_tag(), but with the default global domain tag. | |
345 | */ | |
346 | static inline struct key *request_key(struct key_type *type, | |
347 | const char *description, | |
028db3e2 | 348 | const char *callout_info) |
a58946c1 | 349 | { |
028db3e2 | 350 | return request_key_tag(type, description, NULL, callout_info); |
a58946c1 DH |
351 | } |
352 | ||
353 | #ifdef CONFIG_NET | |
8b6a666a | 354 | /** |
a58946c1 DH |
355 | * request_key_net - Request a key for a net namespace and wait for construction |
356 | * @type: Type of key. | |
357 | * @description: The searchable description of the key. | |
358 | * @net: The network namespace that is the key's domain of operation. | |
359 | * @callout_info: The data to pass to the instantiation upcall (or NULL). | |
360 | * | |
361 | * As for request_key() except that it does not add the returned key to a | |
362 | * keyring if found, new keys are always allocated in the user's quota, the | |
363 | * callout_info must be a NUL-terminated string and no auxiliary data can be | |
364 | * passed. Only keys that operate the specified network namespace are used. | |
365 | * | |
366 | * Furthermore, it then works as wait_for_key_construction() to wait for the | |
367 | * completion of keys undergoing construction with a non-interruptible wait. | |
368 | */ | |
028db3e2 | 369 | #define request_key_net(type, description, net, callout_info) \ |
464e96ae | 370 | request_key_tag(type, description, net->key_domain, callout_info) |
8b6a666a DH |
371 | |
372 | /** | |
373 | * request_key_net_rcu - Request a key for a net namespace under RCU conditions | |
374 | * @type: Type of key. | |
375 | * @description: The searchable description of the key. | |
376 | * @net: The network namespace that is the key's domain of operation. | |
377 | * | |
378 | * As for request_key_rcu() except that only keys that operate the specified | |
379 | * network namespace are used. | |
380 | */ | |
381 | #define request_key_net_rcu(type, description, net) \ | |
464e96ae | 382 | request_key_rcu(type, description, net->key_domain) |
a58946c1 DH |
383 | #endif /* CONFIG_NET */ |
384 | ||
76181c13 DH |
385 | extern int wait_for_key_construction(struct key *key, bool intr); |
386 | ||
b404aef7 | 387 | extern int key_validate(const struct key *key); |
1da177e4 | 388 | |
6c1976ad TW |
389 | extern key_ref_t key_create(key_ref_t keyring, |
390 | const char *type, | |
391 | const char *description, | |
392 | const void *payload, | |
393 | size_t plen, | |
394 | key_perm_t perm, | |
395 | unsigned long flags); | |
396 | ||
664cceb0 DH |
397 | extern key_ref_t key_create_or_update(key_ref_t keyring, |
398 | const char *type, | |
399 | const char *description, | |
400 | const void *payload, | |
401 | size_t plen, | |
028db3e2 | 402 | key_perm_t perm, |
7e047ef5 | 403 | unsigned long flags); |
1da177e4 | 404 | |
664cceb0 | 405 | extern int key_update(key_ref_t key, |
1da177e4 LT |
406 | const void *payload, |
407 | size_t plen); | |
408 | ||
409 | extern int key_link(struct key *keyring, | |
410 | struct key *key); | |
411 | ||
ed0ac5c7 DH |
412 | extern int key_move(struct key *key, |
413 | struct key *from_keyring, | |
414 | struct key *to_keyring, | |
415 | unsigned int flags); | |
416 | ||
1da177e4 LT |
417 | extern int key_unlink(struct key *keyring, |
418 | struct key *key); | |
419 | ||
9a56c2db | 420 | extern struct key *keyring_alloc(const char *description, kuid_t uid, kgid_t gid, |
d84f4f99 | 421 | const struct cred *cred, |
028db3e2 | 422 | key_perm_t perm, |
7e047ef5 | 423 | unsigned long flags, |
2b6aa412 | 424 | struct key_restriction *restrict_link, |
d720024e | 425 | struct key *dest); |
1da177e4 | 426 | |
5ac7eace DH |
427 | extern int restrict_link_reject(struct key *keyring, |
428 | const struct key_type *type, | |
aaf66c88 MM |
429 | const union key_payload *payload, |
430 | struct key *restriction_key); | |
5ac7eace | 431 | |
1da177e4 LT |
432 | extern int keyring_clear(struct key *keyring); |
433 | ||
664cceb0 DH |
434 | extern key_ref_t keyring_search(key_ref_t keyring, |
435 | struct key_type *type, | |
dcf49dbc DH |
436 | const char *description, |
437 | bool recurse); | |
1da177e4 | 438 | |
1da177e4 LT |
439 | extern int keyring_add_key(struct key *keyring, |
440 | struct key *key); | |
441 | ||
6563c91f MM |
442 | extern int keyring_restrict(key_ref_t keyring, const char *type, |
443 | const char *restriction); | |
444 | ||
1da177e4 LT |
445 | extern struct key *key_lookup(key_serial_t id); |
446 | ||
456a8167 | 447 | static inline key_serial_t key_serial(const struct key *key) |
7249db2c DH |
448 | { |
449 | return key ? key->serial : 0; | |
450 | } | |
1da177e4 | 451 | |
59e6b9c1 BS |
452 | extern void key_set_timeout(struct key *, unsigned); |
453 | ||
76ef5e17 | 454 | extern key_ref_t lookup_user_key(key_serial_t id, unsigned long flags, |
8c0637e9 | 455 | enum key_need_perm need_perm); |
b206f281 | 456 | extern void key_free_user_ns(struct user_namespace *); |
76ef5e17 | 457 | |
363b02da DH |
458 | static inline short key_read_state(const struct key *key) |
459 | { | |
460 | /* Barrier versus mark_key_instantiated(). */ | |
461 | return smp_load_acquire(&key->state); | |
462 | } | |
463 | ||
78b7280c | 464 | /** |
363b02da | 465 | * key_is_positive - Determine if a key has been positively instantiated |
78b7280c DH |
466 | * @key: The key to check. |
467 | * | |
468 | * Return true if the specified key has been positively instantiated, false | |
469 | * otherwise. | |
470 | */ | |
363b02da DH |
471 | static inline bool key_is_positive(const struct key *key) |
472 | { | |
473 | return key_read_state(key) == KEY_IS_POSITIVE; | |
474 | } | |
475 | ||
476 | static inline bool key_is_negative(const struct key *key) | |
78b7280c | 477 | { |
363b02da | 478 | return key_read_state(key) < 0; |
78b7280c DH |
479 | } |
480 | ||
0837e49a DH |
481 | #define dereference_key_rcu(KEY) \ |
482 | (rcu_dereference((KEY)->payload.rcu_data0)) | |
483 | ||
484 | #define dereference_key_locked(KEY) \ | |
146aa8b1 | 485 | (rcu_dereference_protected((KEY)->payload.rcu_data0, \ |
633e804e DH |
486 | rwsem_is_locked(&((struct key *)(KEY))->sem))) |
487 | ||
ee0b31a2 | 488 | #define rcu_assign_keypointer(KEY, PAYLOAD) \ |
e5c1f444 | 489 | do { \ |
146aa8b1 | 490 | rcu_assign_pointer((KEY)->payload.rcu_data0, (PAYLOAD)); \ |
e5c1f444 | 491 | } while (0) |
ee0b31a2 | 492 | |
1da177e4 LT |
493 | /* |
494 | * the userspace interface | |
495 | */ | |
d84f4f99 | 496 | extern int install_thread_keyring_to_cred(struct cred *cred); |
2e21865f DH |
497 | extern void key_fsuid_changed(struct cred *new_cred); |
498 | extern void key_fsgid_changed(struct cred *new_cred); | |
1da177e4 LT |
499 | extern void key_init(void); |
500 | ||
501 | #else /* CONFIG_KEYS */ | |
502 | ||
503 | #define key_validate(k) 0 | |
504 | #define key_serial(k) 0 | |
7888e7ff | 505 | #define key_get(k) ({ NULL; }) |
0dab9cfa | 506 | #define key_revoke(k) do { } while(0) |
fd75815f | 507 | #define key_invalidate(k) do { } while(0) |
1da177e4 | 508 | #define key_put(k) do { } while(0) |
664cceb0 | 509 | #define key_ref_put(k) do { } while(0) |
8bbf4976 DH |
510 | #define make_key_ref(k, p) NULL |
511 | #define key_ref_to_ptr(k) NULL | |
664cceb0 | 512 | #define is_key_possessed(k) 0 |
2e21865f DH |
513 | #define key_fsuid_changed(c) do { } while(0) |
514 | #define key_fsgid_changed(c) do { } while(0) | |
1da177e4 | 515 | #define key_init() do { } while(0) |
b206f281 | 516 | #define key_free_user_ns(ns) do { } while(0) |
218e6424 | 517 | #define key_remove_domain(d) do { } while(0) |
037c3431 | 518 | #define key_lookup(k) NULL |
1da177e4 LT |
519 | |
520 | #endif /* CONFIG_KEYS */ | |
521 | #endif /* __KERNEL__ */ | |
522 | #endif /* _LINUX_KEY_H */ |