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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
28typedef int32_t key_serial_t;
29
30
31typedef uint32_t key_perm_t;
32
33struct key;
34struct 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
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76
77enum key_need_perm {
78 KEY_NEED_UNSPECIFIED,
79 KEY_NEED_VIEW,
80 KEY_NEED_READ,
81 KEY_NEED_WRITE,
82 KEY_NEED_SEARCH,
83 KEY_NEED_LINK,
84 KEY_NEED_SETATTR,
85 KEY_NEED_UNLINK,
86 KEY_SYSADMIN_OVERRIDE,
87 KEY_AUTHTOKEN_OVERRIDE,
88 KEY_DEFER_PERM_CHECK,
89};
90
91struct seq_file;
92struct user_struct;
93struct signal_struct;
94struct cred;
95
96struct key_type;
97struct key_owner;
98struct key_tag;
99struct keyring_list;
100struct keyring_name;
101
102struct key_tag {
103 struct rcu_head rcu;
104 refcount_t usage;
105 bool removed;
106};
107
108struct keyring_index_key {
109
110 unsigned long hash;
111 union {
112 struct {
113#ifdef __LITTLE_ENDIAN
114 u16 desc_len;
115 char desc[sizeof(long) - 2];
116#else
117 char desc[sizeof(long) - 2];
118 u16 desc_len;
119#endif
120 };
121 unsigned long x;
122 };
123 struct key_type *type;
124 struct key_tag *domain_tag;
125 const char *description;
126};
127
128union key_payload {
129 void __rcu *rcu_data0;
130 void *data[4];
131};
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146
147typedef struct __key_reference_with_attributes *key_ref_t;
148
149static inline key_ref_t make_key_ref(const struct key *key,
150 bool possession)
151{
152 return (key_ref_t) ((unsigned long) key | possession);
153}
154
155static inline struct key *key_ref_to_ptr(const key_ref_t key_ref)
156{
157 return (struct key *) ((unsigned long) key_ref & ~1UL);
158}
159
160static inline bool is_key_possessed(const key_ref_t key_ref)
161{
162 return (unsigned long) key_ref & 1UL;
163}
164
165typedef int (*key_restrict_link_func_t)(struct key *dest_keyring,
166 const struct key_type *type,
167 const union key_payload *payload,
168 struct key *restriction_key);
169
170struct key_restriction {
171 key_restrict_link_func_t check;
172 struct key *key;
173 struct key_type *keytype;
174};
175
176enum key_state {
177 KEY_IS_UNINSTANTIATED,
178 KEY_IS_POSITIVE,
179};
180
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188
189struct key {
190 refcount_t usage;
191 key_serial_t serial;
192 union {
193 struct list_head graveyard_link;
194 struct rb_node serial_node;
195 };
196#ifdef CONFIG_KEY_NOTIFICATIONS
197 struct watch_list *watchers;
198#endif
199 struct rw_semaphore sem;
200 struct key_user *user;
201 void *security;
202 union {
203 time64_t expiry;
204 time64_t revoked_at;
205 };
206 time64_t last_used_at;
207 kuid_t uid;
208 kgid_t gid;
209 key_perm_t perm;
210 unsigned short quotalen;
211 unsigned short datalen;
212
213
214
215 short state;
216
217#ifdef KEY_DEBUGGING
218 unsigned magic;
219#define KEY_DEBUG_MAGIC 0x18273645u
220#endif
221
222 unsigned long flags;
223#define KEY_FLAG_DEAD 0
224#define KEY_FLAG_REVOKED 1
225#define KEY_FLAG_IN_QUOTA 2
226#define KEY_FLAG_USER_CONSTRUCT 3
227#define KEY_FLAG_ROOT_CAN_CLEAR 4
228#define KEY_FLAG_INVALIDATED 5
229#define KEY_FLAG_BUILTIN 6
230#define KEY_FLAG_ROOT_CAN_INVAL 7
231#define KEY_FLAG_KEEP 8
232#define KEY_FLAG_UID_KEYRING 9
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239 union {
240 struct keyring_index_key index_key;
241 struct {
242 unsigned long hash;
243 unsigned long len_desc;
244 struct key_type *type;
245 struct key_tag *domain_tag;
246 char *description;
247 };
248 };
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254 union {
255 union key_payload payload;
256 struct {
257
258 struct list_head name_link;
259 struct assoc_array keys;
260 };
261 };
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274 struct key_restriction *restrict_link;
275};
276
277extern struct key *key_alloc(struct key_type *type,
278 const char *desc,
279 kuid_t uid, kgid_t gid,
280 const struct cred *cred,
281 key_perm_t perm,
282 unsigned long flags,
283 struct key_restriction *restrict_link);
284
285
286#define KEY_ALLOC_IN_QUOTA 0x0000
287#define KEY_ALLOC_QUOTA_OVERRUN 0x0001
288#define KEY_ALLOC_NOT_IN_QUOTA 0x0002
289#define KEY_ALLOC_BUILT_IN 0x0004
290#define KEY_ALLOC_BYPASS_RESTRICTION 0x0008
291#define KEY_ALLOC_UID_KEYRING 0x0010
292
293extern void key_revoke(struct key *key);
294extern void key_invalidate(struct key *key);
295extern void key_put(struct key *key);
296extern bool key_put_tag(struct key_tag *tag);
297extern void key_remove_domain(struct key_tag *domain_tag);
298
299static inline struct key *__key_get(struct key *key)
300{
301 refcount_inc(&key->usage);
302 return key;
303}
304
305static inline struct key *key_get(struct key *key)
306{
307 return key ? __key_get(key) : key;
308}
309
310static inline void key_ref_put(key_ref_t key_ref)
311{
312 key_put(key_ref_to_ptr(key_ref));
313}
314
315extern struct key *request_key_tag(struct key_type *type,
316 const char *description,
317 struct key_tag *domain_tag,
318 const char *callout_info);
319
320extern struct key *request_key_rcu(struct key_type *type,
321 const char *description,
322 struct key_tag *domain_tag);
323
324extern struct key *request_key_with_auxdata(struct key_type *type,
325 const char *description,
326 struct key_tag *domain_tag,
327 const void *callout_info,
328 size_t callout_len,
329 void *aux);
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339static inline struct key *request_key(struct key_type *type,
340 const char *description,
341 const char *callout_info)
342{
343 return request_key_tag(type, description, NULL, callout_info);
344}
345
346#ifdef CONFIG_NET
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362#define request_key_net(type, description, net, callout_info) \
363 request_key_tag(type, description, net->key_domain, callout_info);
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374#define request_key_net_rcu(type, description, net) \
375 request_key_rcu(type, description, net->key_domain);
376#endif
377
378extern int wait_for_key_construction(struct key *key, bool intr);
379
380extern int key_validate(const struct key *key);
381
382extern key_ref_t key_create_or_update(key_ref_t keyring,
383 const char *type,
384 const char *description,
385 const void *payload,
386 size_t plen,
387 key_perm_t perm,
388 unsigned long flags);
389
390extern int key_update(key_ref_t key,
391 const void *payload,
392 size_t plen);
393
394extern int key_link(struct key *keyring,
395 struct key *key);
396
397extern int key_move(struct key *key,
398 struct key *from_keyring,
399 struct key *to_keyring,
400 unsigned int flags);
401
402extern int key_unlink(struct key *keyring,
403 struct key *key);
404
405extern struct key *keyring_alloc(const char *description, kuid_t uid, kgid_t gid,
406 const struct cred *cred,
407 key_perm_t perm,
408 unsigned long flags,
409 struct key_restriction *restrict_link,
410 struct key *dest);
411
412extern int restrict_link_reject(struct key *keyring,
413 const struct key_type *type,
414 const union key_payload *payload,
415 struct key *restriction_key);
416
417extern int keyring_clear(struct key *keyring);
418
419extern key_ref_t keyring_search(key_ref_t keyring,
420 struct key_type *type,
421 const char *description,
422 bool recurse);
423
424extern int keyring_add_key(struct key *keyring,
425 struct key *key);
426
427extern int keyring_restrict(key_ref_t keyring, const char *type,
428 const char *restriction);
429
430extern struct key *key_lookup(key_serial_t id);
431
432static inline key_serial_t key_serial(const struct key *key)
433{
434 return key ? key->serial : 0;
435}
436
437extern void key_set_timeout(struct key *, unsigned);
438
439extern key_ref_t lookup_user_key(key_serial_t id, unsigned long flags,
440 enum key_need_perm need_perm);
441extern void key_free_user_ns(struct user_namespace *);
442
443static inline short key_read_state(const struct key *key)
444{
445
446 return smp_load_acquire(&key->state);
447}
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456static inline bool key_is_positive(const struct key *key)
457{
458 return key_read_state(key) == KEY_IS_POSITIVE;
459}
460
461static inline bool key_is_negative(const struct key *key)
462{
463 return key_read_state(key) < 0;
464}
465
466#define dereference_key_rcu(KEY) \
467 (rcu_dereference((KEY)->payload.rcu_data0))
468
469#define dereference_key_locked(KEY) \
470 (rcu_dereference_protected((KEY)->payload.rcu_data0, \
471 rwsem_is_locked(&((struct key *)(KEY))->sem)))
472
473#define rcu_assign_keypointer(KEY, PAYLOAD) \
474do { \
475 rcu_assign_pointer((KEY)->payload.rcu_data0, (PAYLOAD)); \
476} while (0)
477
478#ifdef CONFIG_SYSCTL
479extern struct ctl_table key_sysctls[];
480#endif
481
482
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484extern int install_thread_keyring_to_cred(struct cred *cred);
485extern void key_fsuid_changed(struct cred *new_cred);
486extern void key_fsgid_changed(struct cred *new_cred);
487extern void key_init(void);
488
489#else
490
491#define key_validate(k) 0
492#define key_serial(k) 0
493#define key_get(k) ({ NULL; })
494#define key_revoke(k) do { } while(0)
495#define key_invalidate(k) do { } while(0)
496#define key_put(k) do { } while(0)
497#define key_ref_put(k) do { } while(0)
498#define make_key_ref(k, p) NULL
499#define key_ref_to_ptr(k) NULL
500#define is_key_possessed(k) 0
501#define key_fsuid_changed(c) do { } while(0)
502#define key_fsgid_changed(c) do { } while(0)
503#define key_init() do { } while(0)
504#define key_free_user_ns(ns) do { } while(0)
505#define key_remove_domain(d) do { } while(0)
506
507#endif
508#endif
509#endif
510