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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 <asm/atomic.h>
25
26#ifdef __KERNEL__
27
28
29typedef int32_t key_serial_t;
30
31
32typedef uint32_t key_perm_t;
33
34struct key;
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
74struct seq_file;
75struct user_struct;
76struct signal_struct;
77struct cred;
78
79struct key_type;
80struct key_owner;
81struct keyring_list;
82struct keyring_name;
83
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97
98typedef struct __key_reference_with_attributes *key_ref_t;
99
100static inline key_ref_t make_key_ref(const struct key *key,
101 unsigned long possession)
102{
103 return (key_ref_t) ((unsigned long) key | possession);
104}
105
106static inline struct key *key_ref_to_ptr(const key_ref_t key_ref)
107{
108 return (struct key *) ((unsigned long) key_ref & ~1UL);
109}
110
111static inline unsigned long is_key_possessed(const key_ref_t key_ref)
112{
113 return (unsigned long) key_ref & 1UL;
114}
115
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122
123
124struct key {
125 atomic_t usage;
126 key_serial_t serial;
127 struct rb_node serial_node;
128 struct key_type *type;
129 struct rw_semaphore sem;
130 struct key_user *user;
131 void *security;
132 union {
133 time_t expiry;
134 time_t revoked_at;
135 };
136 uid_t uid;
137 gid_t gid;
138 key_perm_t perm;
139 unsigned short quotalen;
140 unsigned short datalen;
141
142
143
144
145#ifdef KEY_DEBUGGING
146 unsigned magic;
147#define KEY_DEBUG_MAGIC 0x18273645u
148#define KEY_DEBUG_MAGIC_X 0xf8e9dacbu
149#endif
150
151 unsigned long flags;
152#define KEY_FLAG_INSTANTIATED 0
153#define KEY_FLAG_DEAD 1
154#define KEY_FLAG_REVOKED 2
155#define KEY_FLAG_IN_QUOTA 3
156#define KEY_FLAG_USER_CONSTRUCT 4
157#define KEY_FLAG_NEGATIVE 5
158
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162
163
164 char *description;
165
166
167
168
169 union {
170 struct list_head link;
171 unsigned long x[2];
172 void *p[2];
173 } type_data;
174
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177
178
179 union {
180 unsigned long value;
181 void *data;
182 struct keyring_list *subscriptions;
183 } payload;
184};
185
186extern struct key *key_alloc(struct key_type *type,
187 const char *desc,
188 uid_t uid, gid_t gid,
189 const struct cred *cred,
190 key_perm_t perm,
191 unsigned long flags);
192
193
194#define KEY_ALLOC_IN_QUOTA 0x0000
195#define KEY_ALLOC_QUOTA_OVERRUN 0x0001
196#define KEY_ALLOC_NOT_IN_QUOTA 0x0002
197
198extern void key_revoke(struct key *key);
199extern void key_put(struct key *key);
200
201static inline struct key *key_get(struct key *key)
202{
203 if (key)
204 atomic_inc(&key->usage);
205 return key;
206}
207
208static inline void key_ref_put(key_ref_t key_ref)
209{
210 key_put(key_ref_to_ptr(key_ref));
211}
212
213extern struct key *request_key(struct key_type *type,
214 const char *description,
215 const char *callout_info);
216
217extern struct key *request_key_with_auxdata(struct key_type *type,
218 const char *description,
219 const void *callout_info,
220 size_t callout_len,
221 void *aux);
222
223extern struct key *request_key_async(struct key_type *type,
224 const char *description,
225 const void *callout_info,
226 size_t callout_len);
227
228extern struct key *request_key_async_with_auxdata(struct key_type *type,
229 const char *description,
230 const void *callout_info,
231 size_t callout_len,
232 void *aux);
233
234extern int wait_for_key_construction(struct key *key, bool intr);
235
236extern int key_validate(struct key *key);
237
238extern key_ref_t key_create_or_update(key_ref_t keyring,
239 const char *type,
240 const char *description,
241 const void *payload,
242 size_t plen,
243 key_perm_t perm,
244 unsigned long flags);
245
246extern int key_update(key_ref_t key,
247 const void *payload,
248 size_t plen);
249
250extern int key_link(struct key *keyring,
251 struct key *key);
252
253extern int key_unlink(struct key *keyring,
254 struct key *key);
255
256extern struct key *keyring_alloc(const char *description, uid_t uid, gid_t gid,
257 const struct cred *cred,
258 unsigned long flags,
259 struct key *dest);
260
261extern int keyring_clear(struct key *keyring);
262
263extern key_ref_t keyring_search(key_ref_t keyring,
264 struct key_type *type,
265 const char *description);
266
267extern int keyring_add_key(struct key *keyring,
268 struct key *key);
269
270extern struct key *key_lookup(key_serial_t id);
271
272static inline key_serial_t key_serial(struct key *key)
273{
274 return key ? key->serial : 0;
275}
276
277#ifdef CONFIG_SYSCTL
278extern ctl_table key_sysctls[];
279#endif
280
281extern void key_replace_session_keyring(void);
282
283
284
285
286extern int install_thread_keyring_to_cred(struct cred *cred);
287extern void key_fsuid_changed(struct task_struct *tsk);
288extern void key_fsgid_changed(struct task_struct *tsk);
289extern void key_init(void);
290
291#else
292
293#define key_validate(k) 0
294#define key_serial(k) 0
295#define key_get(k) ({ NULL; })
296#define key_revoke(k) do { } while(0)
297#define key_put(k) do { } while(0)
298#define key_ref_put(k) do { } while(0)
299#define make_key_ref(k, p) NULL
300#define key_ref_to_ptr(k) NULL
301#define is_key_possessed(k) 0
302#define key_fsuid_changed(t) do { } while(0)
303#define key_fsgid_changed(t) do { } while(0)
304#define key_init() do { } while(0)
305#define key_replace_session_keyring() do { } while(0)
306
307#endif
308#endif
309#endif
310