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12#ifndef _INTERNAL_H
13#define _INTERNAL_H
14
15#include <linux/sched.h>
16#include <linux/key-type.h>
17
18static inline __attribute__((format(printf, 1, 2)))
19void no_printk(const char *fmt, ...)
20{
21}
22
23#ifdef __KDEBUG
24#define kenter(FMT, ...) \
25 printk(KERN_DEBUG "==> %s("FMT")\n", __func__, ##__VA_ARGS__)
26#define kleave(FMT, ...) \
27 printk(KERN_DEBUG "<== %s()"FMT"\n", __func__, ##__VA_ARGS__)
28#define kdebug(FMT, ...) \
29 printk(KERN_DEBUG " "FMT"\n", ##__VA_ARGS__)
30#else
31#define kenter(FMT, ...) \
32 no_printk(KERN_DEBUG "==> %s("FMT")\n", __func__, ##__VA_ARGS__)
33#define kleave(FMT, ...) \
34 no_printk(KERN_DEBUG "<== %s()"FMT"\n", __func__, ##__VA_ARGS__)
35#define kdebug(FMT, ...) \
36 no_printk(KERN_DEBUG FMT"\n", ##__VA_ARGS__)
37#endif
38
39extern struct key_type key_type_user;
40
41
42
43
44
45
46
47
48struct key_user {
49 struct rb_node node;
50 struct mutex cons_lock;
51 spinlock_t lock;
52 atomic_t usage;
53 atomic_t nkeys;
54 atomic_t nikeys;
55 uid_t uid;
56 struct user_namespace *user_ns;
57 int qnkeys;
58 int qnbytes;
59};
60
61extern struct rb_root key_user_tree;
62extern spinlock_t key_user_lock;
63extern struct key_user root_key_user;
64
65extern struct key_user *key_user_lookup(uid_t uid,
66 struct user_namespace *user_ns);
67extern void key_user_put(struct key_user *user);
68
69
70
71
72
73extern unsigned key_quota_root_maxkeys;
74extern unsigned key_quota_root_maxbytes;
75extern unsigned key_quota_maxkeys;
76extern unsigned key_quota_maxbytes;
77
78#define KEYQUOTA_LINK_BYTES 4
79
80
81extern struct rb_root key_serial_tree;
82extern spinlock_t key_serial_lock;
83extern struct mutex key_construction_mutex;
84extern wait_queue_head_t request_key_conswq;
85
86
87extern struct key_type *key_type_lookup(const char *type);
88extern void key_type_put(struct key_type *ktype);
89
90extern int __key_link(struct key *keyring, struct key *key);
91
92extern key_ref_t __keyring_search_one(key_ref_t keyring_ref,
93 const struct key_type *type,
94 const char *description,
95 key_perm_t perm);
96
97extern struct key *keyring_search_instkey(struct key *keyring,
98 key_serial_t target_id);
99
100typedef int (*key_match_func_t)(const struct key *, const void *);
101
102extern key_ref_t keyring_search_aux(key_ref_t keyring_ref,
103 const struct cred *cred,
104 struct key_type *type,
105 const void *description,
106 key_match_func_t match);
107
108extern key_ref_t search_process_keyrings(struct key_type *type,
109 const void *description,
110 key_match_func_t match,
111 const struct cred *cred);
112
113extern struct key *find_keyring_by_name(const char *name, bool skip_perm_check);
114
115extern int install_user_keyrings(void);
116extern int install_thread_keyring_to_cred(struct cred *);
117extern int install_process_keyring_to_cred(struct cred *);
118
119extern struct key *request_key_and_link(struct key_type *type,
120 const char *description,
121 const void *callout_info,
122 size_t callout_len,
123 void *aux,
124 struct key *dest_keyring,
125 unsigned long flags);
126
127extern key_ref_t lookup_user_key(key_serial_t id, unsigned long flags,
128 key_perm_t perm);
129#define KEY_LOOKUP_CREATE 0x01
130#define KEY_LOOKUP_PARTIAL 0x02
131#define KEY_LOOKUP_FOR_UNLINK 0x04
132
133extern long join_session_keyring(const char *name);
134
135extern unsigned key_gc_delay;
136extern void keyring_gc(struct key *keyring, time_t limit);
137extern void key_schedule_gc(time_t expiry_at);
138
139
140
141
142extern int key_task_permission(const key_ref_t key_ref,
143 const struct cred *cred,
144 key_perm_t perm);
145
146static inline int key_permission(const key_ref_t key_ref, key_perm_t perm)
147{
148 return key_task_permission(key_ref, current_cred(), perm);
149}
150
151
152#define KEY_VIEW 0x01
153#define KEY_READ 0x02
154#define KEY_WRITE 0x04
155#define KEY_SEARCH 0x08
156#define KEY_LINK 0x10
157#define KEY_SETATTR 0x20
158#define KEY_ALL 0x3f
159
160
161
162
163struct request_key_auth {
164 struct key *target_key;
165 struct key *dest_keyring;
166 const struct cred *cred;
167 void *callout_info;
168 size_t callout_len;
169 pid_t pid;
170};
171
172extern struct key_type key_type_request_key_auth;
173extern struct key *request_key_auth_new(struct key *target,
174 const void *callout_info,
175 size_t callout_len,
176 struct key *dest_keyring);
177
178extern struct key *key_get_instantiation_authkey(key_serial_t target_id);
179
180
181
182
183extern long keyctl_get_keyring_ID(key_serial_t, int);
184extern long keyctl_join_session_keyring(const char __user *);
185extern long keyctl_update_key(key_serial_t, const void __user *, size_t);
186extern long keyctl_revoke_key(key_serial_t);
187extern long keyctl_keyring_clear(key_serial_t);
188extern long keyctl_keyring_link(key_serial_t, key_serial_t);
189extern long keyctl_keyring_unlink(key_serial_t, key_serial_t);
190extern long keyctl_describe_key(key_serial_t, char __user *, size_t);
191extern long keyctl_keyring_search(key_serial_t, const char __user *,
192 const char __user *, key_serial_t);
193extern long keyctl_read_key(key_serial_t, char __user *, size_t);
194extern long keyctl_chown_key(key_serial_t, uid_t, gid_t);
195extern long keyctl_setperm_key(key_serial_t, key_perm_t);
196extern long keyctl_instantiate_key(key_serial_t, const void __user *,
197 size_t, key_serial_t);
198extern long keyctl_negate_key(key_serial_t, unsigned, key_serial_t);
199extern long keyctl_set_reqkey_keyring(int);
200extern long keyctl_set_timeout(key_serial_t, unsigned);
201extern long keyctl_assume_authority(key_serial_t);
202extern long keyctl_get_security(key_serial_t keyid, char __user *buffer,
203 size_t buflen);
204extern long keyctl_session_to_parent(void);
205
206
207
208
209#ifdef KEY_DEBUGGING
210extern void __key_check(const struct key *);
211
212static inline void key_check(const struct key *key)
213{
214 if (key && (IS_ERR(key) || key->magic != KEY_DEBUG_MAGIC))
215 __key_check(key);
216}
217
218#else
219
220#define key_check(key) do {} while(0)
221
222#endif
223
224#endif
225