Loading...
1/* Authentication token and access key management internal defs
2 *
3 * Copyright (C) 2003-5, 2007 Red Hat, Inc. All Rights Reserved.
4 * Written by David Howells (dhowells@redhat.com)
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version
9 * 2 of the License, or (at your option) any later version.
10 */
11
12#ifndef _INTERNAL_H
13#define _INTERNAL_H
14
15#include <linux/sched.h>
16#include <linux/key-type.h>
17#include <linux/task_work.h>
18
19struct iovec;
20
21#ifdef __KDEBUG
22#define kenter(FMT, ...) \
23 printk(KERN_DEBUG "==> %s("FMT")\n", __func__, ##__VA_ARGS__)
24#define kleave(FMT, ...) \
25 printk(KERN_DEBUG "<== %s()"FMT"\n", __func__, ##__VA_ARGS__)
26#define kdebug(FMT, ...) \
27 printk(KERN_DEBUG " "FMT"\n", ##__VA_ARGS__)
28#else
29#define kenter(FMT, ...) \
30 no_printk(KERN_DEBUG "==> %s("FMT")\n", __func__, ##__VA_ARGS__)
31#define kleave(FMT, ...) \
32 no_printk(KERN_DEBUG "<== %s()"FMT"\n", __func__, ##__VA_ARGS__)
33#define kdebug(FMT, ...) \
34 no_printk(KERN_DEBUG FMT"\n", ##__VA_ARGS__)
35#endif
36
37extern struct key_type key_type_dead;
38extern struct key_type key_type_user;
39extern struct key_type key_type_logon;
40
41/*****************************************************************************/
42/*
43 * Keep track of keys for a user.
44 *
45 * This needs to be separate to user_struct to avoid a refcount-loop
46 * (user_struct pins some keyrings which pin this struct).
47 *
48 * We also keep track of keys under request from userspace for this UID here.
49 */
50struct key_user {
51 struct rb_node node;
52 struct mutex cons_lock; /* construction initiation lock */
53 spinlock_t lock;
54 atomic_t usage; /* for accessing qnkeys & qnbytes */
55 atomic_t nkeys; /* number of keys */
56 atomic_t nikeys; /* number of instantiated keys */
57 kuid_t uid;
58 int qnkeys; /* number of keys allocated to this user */
59 int qnbytes; /* number of bytes allocated to this user */
60};
61
62extern struct rb_root key_user_tree;
63extern spinlock_t key_user_lock;
64extern struct key_user root_key_user;
65
66extern struct key_user *key_user_lookup(kuid_t uid);
67extern void key_user_put(struct key_user *user);
68
69/*
70 * Key quota limits.
71 * - root has its own separate limits to everyone else
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 /* a link in a keyring is worth 4 bytes */
79
80
81extern struct kmem_cache *key_jar;
82extern struct rb_root key_serial_tree;
83extern spinlock_t key_serial_lock;
84extern struct mutex key_construction_mutex;
85extern wait_queue_head_t request_key_conswq;
86
87
88extern struct key_type *key_type_lookup(const char *type);
89extern void key_type_put(struct key_type *ktype);
90
91extern int __key_link_begin(struct key *keyring,
92 const struct keyring_index_key *index_key,
93 struct assoc_array_edit **_edit);
94extern int __key_link_check_live_key(struct key *keyring, struct key *key);
95extern void __key_link(struct key *key, struct assoc_array_edit **_edit);
96extern void __key_link_end(struct key *keyring,
97 const struct keyring_index_key *index_key,
98 struct assoc_array_edit *edit);
99
100extern key_ref_t find_key_to_update(key_ref_t keyring_ref,
101 const struct keyring_index_key *index_key);
102
103extern struct key *keyring_search_instkey(struct key *keyring,
104 key_serial_t target_id);
105
106extern int iterate_over_keyring(const struct key *keyring,
107 int (*func)(const struct key *key, void *data),
108 void *data);
109
110struct keyring_search_context {
111 struct keyring_index_key index_key;
112 const struct cred *cred;
113 struct key_match_data match_data;
114 unsigned flags;
115#define KEYRING_SEARCH_NO_STATE_CHECK 0x0001 /* Skip state checks */
116#define KEYRING_SEARCH_DO_STATE_CHECK 0x0002 /* Override NO_STATE_CHECK */
117#define KEYRING_SEARCH_NO_UPDATE_TIME 0x0004 /* Don't update times */
118#define KEYRING_SEARCH_NO_CHECK_PERM 0x0008 /* Don't check permissions */
119#define KEYRING_SEARCH_DETECT_TOO_DEEP 0x0010 /* Give an error on excessive depth */
120#define KEYRING_SEARCH_SKIP_EXPIRED 0x0020 /* Ignore expired keys (intention to replace) */
121
122 int (*iterator)(const void *object, void *iterator_data);
123
124 /* Internal stuff */
125 int skipped_ret;
126 bool possessed;
127 key_ref_t result;
128 struct timespec now;
129};
130
131extern bool key_default_cmp(const struct key *key,
132 const struct key_match_data *match_data);
133extern key_ref_t keyring_search_aux(key_ref_t keyring_ref,
134 struct keyring_search_context *ctx);
135
136extern key_ref_t search_my_process_keyrings(struct keyring_search_context *ctx);
137extern key_ref_t search_process_keyrings(struct keyring_search_context *ctx);
138
139extern struct key *find_keyring_by_name(const char *name, bool skip_perm_check);
140
141extern int install_user_keyrings(void);
142extern int install_thread_keyring_to_cred(struct cred *);
143extern int install_process_keyring_to_cred(struct cred *);
144extern int install_session_keyring_to_cred(struct cred *, struct key *);
145
146extern struct key *request_key_and_link(struct key_type *type,
147 const char *description,
148 const void *callout_info,
149 size_t callout_len,
150 void *aux,
151 struct key *dest_keyring,
152 unsigned long flags);
153
154extern bool lookup_user_key_possessed(const struct key *key,
155 const struct key_match_data *match_data);
156extern key_ref_t lookup_user_key(key_serial_t id, unsigned long flags,
157 key_perm_t perm);
158#define KEY_LOOKUP_CREATE 0x01
159#define KEY_LOOKUP_PARTIAL 0x02
160#define KEY_LOOKUP_FOR_UNLINK 0x04
161
162extern long join_session_keyring(const char *name);
163extern void key_change_session_keyring(struct callback_head *twork);
164
165extern struct work_struct key_gc_work;
166extern unsigned key_gc_delay;
167extern void keyring_gc(struct key *keyring, time_t limit);
168extern void key_schedule_gc(time_t gc_at);
169extern void key_schedule_gc_links(void);
170extern void key_gc_keytype(struct key_type *ktype);
171
172extern int key_task_permission(const key_ref_t key_ref,
173 const struct cred *cred,
174 key_perm_t perm);
175
176/*
177 * Check to see whether permission is granted to use a key in the desired way.
178 */
179static inline int key_permission(const key_ref_t key_ref, unsigned perm)
180{
181 return key_task_permission(key_ref, current_cred(), perm);
182}
183
184/*
185 * Authorisation record for request_key().
186 */
187struct request_key_auth {
188 struct key *target_key;
189 struct key *dest_keyring;
190 const struct cred *cred;
191 void *callout_info;
192 size_t callout_len;
193 pid_t pid;
194};
195
196extern struct key_type key_type_request_key_auth;
197extern struct key *request_key_auth_new(struct key *target,
198 const void *callout_info,
199 size_t callout_len,
200 struct key *dest_keyring);
201
202extern struct key *key_get_instantiation_authkey(key_serial_t target_id);
203
204/*
205 * Determine whether a key is dead.
206 */
207static inline bool key_is_dead(const struct key *key, time_t limit)
208{
209 return
210 key->flags & ((1 << KEY_FLAG_DEAD) |
211 (1 << KEY_FLAG_INVALIDATED)) ||
212 (key->expiry > 0 && key->expiry <= limit);
213}
214
215/*
216 * keyctl() functions
217 */
218extern long keyctl_get_keyring_ID(key_serial_t, int);
219extern long keyctl_join_session_keyring(const char __user *);
220extern long keyctl_update_key(key_serial_t, const void __user *, size_t);
221extern long keyctl_revoke_key(key_serial_t);
222extern long keyctl_keyring_clear(key_serial_t);
223extern long keyctl_keyring_link(key_serial_t, key_serial_t);
224extern long keyctl_keyring_unlink(key_serial_t, key_serial_t);
225extern long keyctl_describe_key(key_serial_t, char __user *, size_t);
226extern long keyctl_keyring_search(key_serial_t, const char __user *,
227 const char __user *, key_serial_t);
228extern long keyctl_read_key(key_serial_t, char __user *, size_t);
229extern long keyctl_chown_key(key_serial_t, uid_t, gid_t);
230extern long keyctl_setperm_key(key_serial_t, key_perm_t);
231extern long keyctl_instantiate_key(key_serial_t, const void __user *,
232 size_t, key_serial_t);
233extern long keyctl_negate_key(key_serial_t, unsigned, key_serial_t);
234extern long keyctl_set_reqkey_keyring(int);
235extern long keyctl_set_timeout(key_serial_t, unsigned);
236extern long keyctl_assume_authority(key_serial_t);
237extern long keyctl_get_security(key_serial_t keyid, char __user *buffer,
238 size_t buflen);
239extern long keyctl_session_to_parent(void);
240extern long keyctl_reject_key(key_serial_t, unsigned, unsigned, key_serial_t);
241extern long keyctl_instantiate_key_iov(key_serial_t,
242 const struct iovec __user *,
243 unsigned, key_serial_t);
244extern long keyctl_invalidate_key(key_serial_t);
245
246struct iov_iter;
247extern long keyctl_instantiate_key_common(key_serial_t,
248 struct iov_iter *,
249 key_serial_t);
250#ifdef CONFIG_PERSISTENT_KEYRINGS
251extern long keyctl_get_persistent(uid_t, key_serial_t);
252extern unsigned persistent_keyring_expiry;
253#else
254static inline long keyctl_get_persistent(uid_t uid, key_serial_t destring)
255{
256 return -EOPNOTSUPP;
257}
258#endif
259
260/*
261 * Debugging key validation
262 */
263#ifdef KEY_DEBUGGING
264extern void __key_check(const struct key *);
265
266static inline void key_check(const struct key *key)
267{
268 if (key && (IS_ERR(key) || key->magic != KEY_DEBUG_MAGIC))
269 __key_check(key);
270}
271
272#else
273
274#define key_check(key) do {} while(0)
275
276#endif
277
278#endif /* _INTERNAL_H */
1/* Authentication token and access key management internal defs
2 *
3 * Copyright (C) 2003-5, 2007 Red Hat, Inc. All Rights Reserved.
4 * Written by David Howells (dhowells@redhat.com)
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version
9 * 2 of the License, or (at your option) any later version.
10 */
11
12#ifndef _INTERNAL_H
13#define _INTERNAL_H
14
15#include <linux/sched.h>
16#include <linux/key-type.h>
17#include <linux/task_work.h>
18
19struct iovec;
20
21#ifdef __KDEBUG
22#define kenter(FMT, ...) \
23 printk(KERN_DEBUG "==> %s("FMT")\n", __func__, ##__VA_ARGS__)
24#define kleave(FMT, ...) \
25 printk(KERN_DEBUG "<== %s()"FMT"\n", __func__, ##__VA_ARGS__)
26#define kdebug(FMT, ...) \
27 printk(KERN_DEBUG " "FMT"\n", ##__VA_ARGS__)
28#else
29#define kenter(FMT, ...) \
30 no_printk(KERN_DEBUG "==> %s("FMT")\n", __func__, ##__VA_ARGS__)
31#define kleave(FMT, ...) \
32 no_printk(KERN_DEBUG "<== %s()"FMT"\n", __func__, ##__VA_ARGS__)
33#define kdebug(FMT, ...) \
34 no_printk(KERN_DEBUG FMT"\n", ##__VA_ARGS__)
35#endif
36
37extern struct key_type key_type_dead;
38extern struct key_type key_type_user;
39extern struct key_type key_type_logon;
40
41/*****************************************************************************/
42/*
43 * Keep track of keys for a user.
44 *
45 * This needs to be separate to user_struct to avoid a refcount-loop
46 * (user_struct pins some keyrings which pin this struct).
47 *
48 * We also keep track of keys under request from userspace for this UID here.
49 */
50struct key_user {
51 struct rb_node node;
52 struct mutex cons_lock; /* construction initiation lock */
53 spinlock_t lock;
54 atomic_t usage; /* for accessing qnkeys & qnbytes */
55 atomic_t nkeys; /* number of keys */
56 atomic_t nikeys; /* number of instantiated keys */
57 kuid_t uid;
58 int qnkeys; /* number of keys allocated to this user */
59 int qnbytes; /* number of bytes allocated to this user */
60};
61
62extern struct rb_root key_user_tree;
63extern spinlock_t key_user_lock;
64extern struct key_user root_key_user;
65
66extern struct key_user *key_user_lookup(kuid_t uid);
67extern void key_user_put(struct key_user *user);
68
69/*
70 * Key quota limits.
71 * - root has its own separate limits to everyone else
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 /* a link in a keyring is worth 4 bytes */
79
80
81extern struct kmem_cache *key_jar;
82extern struct rb_root key_serial_tree;
83extern spinlock_t key_serial_lock;
84extern struct mutex key_construction_mutex;
85extern wait_queue_head_t request_key_conswq;
86
87
88extern struct key_type *key_type_lookup(const char *type);
89extern void key_type_put(struct key_type *ktype);
90
91extern int __key_link_begin(struct key *keyring,
92 const struct keyring_index_key *index_key,
93 struct assoc_array_edit **_edit);
94extern int __key_link_check_live_key(struct key *keyring, struct key *key);
95extern void __key_link(struct key *key, struct assoc_array_edit **_edit);
96extern void __key_link_end(struct key *keyring,
97 const struct keyring_index_key *index_key,
98 struct assoc_array_edit *edit);
99
100extern key_ref_t find_key_to_update(key_ref_t keyring_ref,
101 const struct keyring_index_key *index_key);
102
103extern struct key *keyring_search_instkey(struct key *keyring,
104 key_serial_t target_id);
105
106extern int iterate_over_keyring(const struct key *keyring,
107 int (*func)(const struct key *key, void *data),
108 void *data);
109
110typedef int (*key_match_func_t)(const struct key *, const void *);
111
112struct keyring_search_context {
113 struct keyring_index_key index_key;
114 const struct cred *cred;
115 key_match_func_t match;
116 const void *match_data;
117 unsigned flags;
118#define KEYRING_SEARCH_LOOKUP_TYPE 0x0001 /* [as type->def_lookup_type] */
119#define KEYRING_SEARCH_NO_STATE_CHECK 0x0002 /* Skip state checks */
120#define KEYRING_SEARCH_DO_STATE_CHECK 0x0004 /* Override NO_STATE_CHECK */
121#define KEYRING_SEARCH_NO_UPDATE_TIME 0x0008 /* Don't update times */
122#define KEYRING_SEARCH_NO_CHECK_PERM 0x0010 /* Don't check permissions */
123#define KEYRING_SEARCH_DETECT_TOO_DEEP 0x0020 /* Give an error on excessive depth */
124
125 int (*iterator)(const void *object, void *iterator_data);
126
127 /* Internal stuff */
128 int skipped_ret;
129 bool possessed;
130 key_ref_t result;
131 struct timespec now;
132};
133
134extern key_ref_t keyring_search_aux(key_ref_t keyring_ref,
135 struct keyring_search_context *ctx);
136
137extern key_ref_t search_my_process_keyrings(struct keyring_search_context *ctx);
138extern key_ref_t search_process_keyrings(struct keyring_search_context *ctx);
139
140extern struct key *find_keyring_by_name(const char *name, bool skip_perm_check);
141
142extern int install_user_keyrings(void);
143extern int install_thread_keyring_to_cred(struct cred *);
144extern int install_process_keyring_to_cred(struct cred *);
145extern int install_session_keyring_to_cred(struct cred *, struct key *);
146
147extern struct key *request_key_and_link(struct key_type *type,
148 const char *description,
149 const void *callout_info,
150 size_t callout_len,
151 void *aux,
152 struct key *dest_keyring,
153 unsigned long flags);
154
155extern int lookup_user_key_possessed(const struct key *key, const void *target);
156extern key_ref_t lookup_user_key(key_serial_t id, unsigned long flags,
157 key_perm_t perm);
158#define KEY_LOOKUP_CREATE 0x01
159#define KEY_LOOKUP_PARTIAL 0x02
160#define KEY_LOOKUP_FOR_UNLINK 0x04
161
162extern long join_session_keyring(const char *name);
163extern void key_change_session_keyring(struct callback_head *twork);
164
165extern struct work_struct key_gc_work;
166extern unsigned key_gc_delay;
167extern void keyring_gc(struct key *keyring, time_t limit);
168extern void key_schedule_gc(time_t gc_at);
169extern void key_schedule_gc_links(void);
170extern void key_gc_keytype(struct key_type *ktype);
171
172extern int key_task_permission(const key_ref_t key_ref,
173 const struct cred *cred,
174 key_perm_t perm);
175
176/*
177 * Check to see whether permission is granted to use a key in the desired way.
178 */
179static inline int key_permission(const key_ref_t key_ref, key_perm_t perm)
180{
181 return key_task_permission(key_ref, current_cred(), perm);
182}
183
184/* required permissions */
185#define KEY_VIEW 0x01 /* require permission to view attributes */
186#define KEY_READ 0x02 /* require permission to read content */
187#define KEY_WRITE 0x04 /* require permission to update / modify */
188#define KEY_SEARCH 0x08 /* require permission to search (keyring) or find (key) */
189#define KEY_LINK 0x10 /* require permission to link */
190#define KEY_SETATTR 0x20 /* require permission to change attributes */
191#define KEY_ALL 0x3f /* all the above permissions */
192
193/*
194 * Authorisation record for request_key().
195 */
196struct request_key_auth {
197 struct key *target_key;
198 struct key *dest_keyring;
199 const struct cred *cred;
200 void *callout_info;
201 size_t callout_len;
202 pid_t pid;
203};
204
205extern struct key_type key_type_request_key_auth;
206extern struct key *request_key_auth_new(struct key *target,
207 const void *callout_info,
208 size_t callout_len,
209 struct key *dest_keyring);
210
211extern struct key *key_get_instantiation_authkey(key_serial_t target_id);
212
213/*
214 * Determine whether a key is dead.
215 */
216static inline bool key_is_dead(const struct key *key, time_t limit)
217{
218 return
219 key->flags & ((1 << KEY_FLAG_DEAD) |
220 (1 << KEY_FLAG_INVALIDATED)) ||
221 (key->expiry > 0 && key->expiry <= limit);
222}
223
224/*
225 * keyctl() functions
226 */
227extern long keyctl_get_keyring_ID(key_serial_t, int);
228extern long keyctl_join_session_keyring(const char __user *);
229extern long keyctl_update_key(key_serial_t, const void __user *, size_t);
230extern long keyctl_revoke_key(key_serial_t);
231extern long keyctl_keyring_clear(key_serial_t);
232extern long keyctl_keyring_link(key_serial_t, key_serial_t);
233extern long keyctl_keyring_unlink(key_serial_t, key_serial_t);
234extern long keyctl_describe_key(key_serial_t, char __user *, size_t);
235extern long keyctl_keyring_search(key_serial_t, const char __user *,
236 const char __user *, key_serial_t);
237extern long keyctl_read_key(key_serial_t, char __user *, size_t);
238extern long keyctl_chown_key(key_serial_t, uid_t, gid_t);
239extern long keyctl_setperm_key(key_serial_t, key_perm_t);
240extern long keyctl_instantiate_key(key_serial_t, const void __user *,
241 size_t, key_serial_t);
242extern long keyctl_negate_key(key_serial_t, unsigned, key_serial_t);
243extern long keyctl_set_reqkey_keyring(int);
244extern long keyctl_set_timeout(key_serial_t, unsigned);
245extern long keyctl_assume_authority(key_serial_t);
246extern long keyctl_get_security(key_serial_t keyid, char __user *buffer,
247 size_t buflen);
248extern long keyctl_session_to_parent(void);
249extern long keyctl_reject_key(key_serial_t, unsigned, unsigned, key_serial_t);
250extern long keyctl_instantiate_key_iov(key_serial_t,
251 const struct iovec __user *,
252 unsigned, key_serial_t);
253extern long keyctl_invalidate_key(key_serial_t);
254
255extern long keyctl_instantiate_key_common(key_serial_t,
256 const struct iovec *,
257 unsigned, size_t, key_serial_t);
258#ifdef CONFIG_PERSISTENT_KEYRINGS
259extern long keyctl_get_persistent(uid_t, key_serial_t);
260extern unsigned persistent_keyring_expiry;
261#else
262static inline long keyctl_get_persistent(uid_t uid, key_serial_t destring)
263{
264 return -EOPNOTSUPP;
265}
266#endif
267
268/*
269 * Debugging key validation
270 */
271#ifdef KEY_DEBUGGING
272extern void __key_check(const struct key *);
273
274static inline void key_check(const struct key *key)
275{
276 if (key && (IS_ERR(key) || key->magic != KEY_DEBUG_MAGIC))
277 __key_check(key);
278}
279
280#else
281
282#define key_check(key) do {} while(0)
283
284#endif
285
286#endif /* _INTERNAL_H */