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15#ifndef _LINUX_KEY_H
16#define _LINUX_KEY_H
17
18#include <linux/types.h>
19#include <linux/list.h>
20#include <linux/rbtree.h>
21#include <linux/rcupdate.h>
22#include <linux/sysctl.h>
23#include <linux/rwsem.h>
24#include <linux/atomic.h>
25
26#ifdef __KERNEL__
27#include <linux/uidgid.h>
28
29
30typedef int32_t key_serial_t;
31
32
33typedef uint32_t key_perm_t;
34
35struct key;
36
37#ifdef CONFIG_KEYS
38
39#undef KEY_DEBUGGING
40
41#define KEY_POS_VIEW 0x01000000
42#define KEY_POS_READ 0x02000000
43#define KEY_POS_WRITE 0x04000000
44#define KEY_POS_SEARCH 0x08000000
45#define KEY_POS_LINK 0x10000000
46#define KEY_POS_SETATTR 0x20000000
47#define KEY_POS_ALL 0x3f000000
48
49#define KEY_USR_VIEW 0x00010000
50#define KEY_USR_READ 0x00020000
51#define KEY_USR_WRITE 0x00040000
52#define KEY_USR_SEARCH 0x00080000
53#define KEY_USR_LINK 0x00100000
54#define KEY_USR_SETATTR 0x00200000
55#define KEY_USR_ALL 0x003f0000
56
57#define KEY_GRP_VIEW 0x00000100
58#define KEY_GRP_READ 0x00000200
59#define KEY_GRP_WRITE 0x00000400
60#define KEY_GRP_SEARCH 0x00000800
61#define KEY_GRP_LINK 0x00001000
62#define KEY_GRP_SETATTR 0x00002000
63#define KEY_GRP_ALL 0x00003f00
64
65#define KEY_OTH_VIEW 0x00000001
66#define KEY_OTH_READ 0x00000002
67#define KEY_OTH_WRITE 0x00000004
68#define KEY_OTH_SEARCH 0x00000008
69#define KEY_OTH_LINK 0x00000010
70#define KEY_OTH_SETATTR 0x00000020
71#define KEY_OTH_ALL 0x0000003f
72
73#define KEY_PERM_UNDEF 0xffffffff
74
75struct seq_file;
76struct user_struct;
77struct signal_struct;
78struct cred;
79
80struct key_type;
81struct key_owner;
82struct keyring_list;
83struct keyring_name;
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98
99typedef struct __key_reference_with_attributes *key_ref_t;
100
101static inline key_ref_t make_key_ref(const struct key *key,
102 unsigned long possession)
103{
104 return (key_ref_t) ((unsigned long) key | possession);
105}
106
107static inline struct key *key_ref_to_ptr(const key_ref_t key_ref)
108{
109 return (struct key *) ((unsigned long) key_ref & ~1UL);
110}
111
112static inline unsigned long is_key_possessed(const key_ref_t key_ref)
113{
114 return (unsigned long) key_ref & 1UL;
115}
116
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122
123
124
125struct key {
126 atomic_t usage;
127 key_serial_t serial;
128 union {
129 struct list_head graveyard_link;
130 struct rb_node serial_node;
131 };
132 struct key_type *type;
133 struct rw_semaphore sem;
134 struct key_user *user;
135 void *security;
136 union {
137 time_t expiry;
138 time_t revoked_at;
139 };
140 time_t last_used_at;
141 kuid_t uid;
142 kgid_t gid;
143 key_perm_t perm;
144 unsigned short quotalen;
145 unsigned short datalen;
146
147
148
149
150#ifdef KEY_DEBUGGING
151 unsigned magic;
152#define KEY_DEBUG_MAGIC 0x18273645u
153#define KEY_DEBUG_MAGIC_X 0xf8e9dacbu
154#endif
155
156 unsigned long flags;
157#define KEY_FLAG_INSTANTIATED 0
158#define KEY_FLAG_DEAD 1
159#define KEY_FLAG_REVOKED 2
160#define KEY_FLAG_IN_QUOTA 3
161#define KEY_FLAG_USER_CONSTRUCT 4
162#define KEY_FLAG_NEGATIVE 5
163#define KEY_FLAG_ROOT_CAN_CLEAR 6
164#define KEY_FLAG_INVALIDATED 7
165
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170
171 char *description;
172
173
174
175
176 union {
177 struct list_head link;
178 unsigned long x[2];
179 void *p[2];
180 int reject_error;
181 } type_data;
182
183
184
185
186
187 union {
188 unsigned long value;
189 void __rcu *rcudata;
190 void *data;
191 struct keyring_list __rcu *subscriptions;
192 } payload;
193};
194
195extern struct key *key_alloc(struct key_type *type,
196 const char *desc,
197 kuid_t uid, kgid_t gid,
198 const struct cred *cred,
199 key_perm_t perm,
200 unsigned long flags);
201
202
203#define KEY_ALLOC_IN_QUOTA 0x0000
204#define KEY_ALLOC_QUOTA_OVERRUN 0x0001
205#define KEY_ALLOC_NOT_IN_QUOTA 0x0002
206
207extern void key_revoke(struct key *key);
208extern void key_invalidate(struct key *key);
209extern void key_put(struct key *key);
210
211static inline struct key *key_get(struct key *key)
212{
213 if (key)
214 atomic_inc(&key->usage);
215 return key;
216}
217
218static inline void key_ref_put(key_ref_t key_ref)
219{
220 key_put(key_ref_to_ptr(key_ref));
221}
222
223extern struct key *request_key(struct key_type *type,
224 const char *description,
225 const char *callout_info);
226
227extern struct key *request_key_with_auxdata(struct key_type *type,
228 const char *description,
229 const void *callout_info,
230 size_t callout_len,
231 void *aux);
232
233extern struct key *request_key_async(struct key_type *type,
234 const char *description,
235 const void *callout_info,
236 size_t callout_len);
237
238extern struct key *request_key_async_with_auxdata(struct key_type *type,
239 const char *description,
240 const void *callout_info,
241 size_t callout_len,
242 void *aux);
243
244extern int wait_for_key_construction(struct key *key, bool intr);
245
246extern int key_validate(const struct key *key);
247
248extern key_ref_t key_create_or_update(key_ref_t keyring,
249 const char *type,
250 const char *description,
251 const void *payload,
252 size_t plen,
253 key_perm_t perm,
254 unsigned long flags);
255
256extern int key_update(key_ref_t key,
257 const void *payload,
258 size_t plen);
259
260extern int key_link(struct key *keyring,
261 struct key *key);
262
263extern int key_unlink(struct key *keyring,
264 struct key *key);
265
266extern struct key *keyring_alloc(const char *description, kuid_t uid, kgid_t gid,
267 const struct cred *cred,
268 key_perm_t perm,
269 unsigned long flags,
270 struct key *dest);
271
272extern int keyring_clear(struct key *keyring);
273
274extern key_ref_t keyring_search(key_ref_t keyring,
275 struct key_type *type,
276 const char *description);
277
278extern int keyring_add_key(struct key *keyring,
279 struct key *key);
280
281extern struct key *key_lookup(key_serial_t id);
282
283static inline key_serial_t key_serial(const struct key *key)
284{
285 return key ? key->serial : 0;
286}
287
288extern void key_set_timeout(struct key *, unsigned);
289
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296
297static inline bool key_is_instantiated(const struct key *key)
298{
299 return test_bit(KEY_FLAG_INSTANTIATED, &key->flags) &&
300 !test_bit(KEY_FLAG_NEGATIVE, &key->flags);
301}
302
303#define rcu_dereference_key(KEY) \
304 (rcu_dereference_protected((KEY)->payload.rcudata, \
305 rwsem_is_locked(&((struct key *)(KEY))->sem)))
306
307#define rcu_assign_keypointer(KEY, PAYLOAD) \
308do { \
309 rcu_assign_pointer((KEY)->payload.rcudata, (PAYLOAD)); \
310} while (0)
311
312#ifdef CONFIG_SYSCTL
313extern ctl_table key_sysctls[];
314#endif
315
316
317
318extern int install_thread_keyring_to_cred(struct cred *cred);
319extern void key_fsuid_changed(struct task_struct *tsk);
320extern void key_fsgid_changed(struct task_struct *tsk);
321extern void key_init(void);
322
323#else
324
325#define key_validate(k) 0
326#define key_serial(k) 0
327#define key_get(k) ({ NULL; })
328#define key_revoke(k) do { } while(0)
329#define key_invalidate(k) do { } while(0)
330#define key_put(k) do { } while(0)
331#define key_ref_put(k) do { } while(0)
332#define make_key_ref(k, p) NULL
333#define key_ref_to_ptr(k) NULL
334#define is_key_possessed(k) 0
335#define key_fsuid_changed(t) do { } while(0)
336#define key_fsgid_changed(t) do { } while(0)
337#define key_init() do { } while(0)
338
339#endif
340#endif
341#endif
342