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David Howells973c9f42011-01-20 16:38:33 +00001/* Authentication token and access key management internal defs
Linus Torvalds1da177e2005-04-16 15:20:36 -07002 *
David Howells76181c12007-10-16 23:29:46 -07003 * Copyright (C) 2003-5, 2007 Red Hat, Inc. All Rights Reserved.
Linus Torvalds1da177e2005-04-16 15:20:36 -07004 * 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
David Howellsd84f4f92008-11-14 10:39:23 +110015#include <linux/sched.h>
David Howells76181c12007-10-16 23:29:46 -070016#include <linux/key-type.h>
Oleg Nesterov413cd3d2012-05-11 10:59:08 +100017#include <linux/task_work.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070018
Kent Overstreeta27bb332013-05-07 16:19:08 -070019struct iovec;
20
David Howells76181c12007-10-16 23:29:46 -070021#ifdef __KDEBUG
22#define kenter(FMT, ...) \
Harvey Harrisondd6f9532008-03-06 10:03:59 +110023 printk(KERN_DEBUG "==> %s("FMT")\n", __func__, ##__VA_ARGS__)
David Howells76181c12007-10-16 23:29:46 -070024#define kleave(FMT, ...) \
Harvey Harrisondd6f9532008-03-06 10:03:59 +110025 printk(KERN_DEBUG "<== %s()"FMT"\n", __func__, ##__VA_ARGS__)
David Howells76181c12007-10-16 23:29:46 -070026#define kdebug(FMT, ...) \
David Howellsd84f4f92008-11-14 10:39:23 +110027 printk(KERN_DEBUG " "FMT"\n", ##__VA_ARGS__)
David Howells3e301482005-06-23 22:00:56 -070028#else
David Howells76181c12007-10-16 23:29:46 -070029#define kenter(FMT, ...) \
Harvey Harrisondd6f9532008-03-06 10:03:59 +110030 no_printk(KERN_DEBUG "==> %s("FMT")\n", __func__, ##__VA_ARGS__)
David Howells76181c12007-10-16 23:29:46 -070031#define kleave(FMT, ...) \
Harvey Harrisondd6f9532008-03-06 10:03:59 +110032 no_printk(KERN_DEBUG "<== %s()"FMT"\n", __func__, ##__VA_ARGS__)
David Howells76181c12007-10-16 23:29:46 -070033#define kdebug(FMT, ...) \
34 no_printk(KERN_DEBUG FMT"\n", ##__VA_ARGS__)
David Howells3e301482005-06-23 22:00:56 -070035#endif
36
David Howells0c061b52011-08-22 14:09:36 +010037extern struct key_type key_type_dead;
Linus Torvalds1da177e2005-04-16 15:20:36 -070038extern struct key_type key_type_user;
Jeff Layton9f6ed2c2012-01-17 16:09:11 -050039extern struct key_type key_type_logon;
Linus Torvalds1da177e2005-04-16 15:20:36 -070040
41/*****************************************************************************/
42/*
David Howells973c9f42011-01-20 16:38:33 +000043 * 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.
Linus Torvalds1da177e2005-04-16 15:20:36 -070049 */
50struct key_user {
51 struct rb_node node;
David Howells76181c12007-10-16 23:29:46 -070052 struct mutex cons_lock; /* construction initiation lock */
Linus Torvalds1da177e2005-04-16 15:20:36 -070053 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 */
Eric W. Biederman9a56c2d2012-02-08 07:53:04 -080057 kuid_t uid;
Linus Torvalds1da177e2005-04-16 15:20:36 -070058 int qnkeys; /* number of keys allocated to this user */
59 int qnbytes; /* number of bytes allocated to this user */
60};
61
Linus Torvalds1da177e2005-04-16 15:20:36 -070062extern struct rb_root key_user_tree;
63extern spinlock_t key_user_lock;
64extern struct key_user root_key_user;
65
Eric W. Biederman9a56c2d2012-02-08 07:53:04 -080066extern struct key_user *key_user_lookup(kuid_t uid);
Linus Torvalds1da177e2005-04-16 15:20:36 -070067extern void key_user_put(struct key_user *user);
68
David Howells0b77f5b2008-04-29 01:01:32 -070069/*
David Howells973c9f42011-01-20 16:38:33 +000070 * Key quota limits.
David Howells0b77f5b2008-04-29 01:01:32 -070071 * - 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 */
Linus Torvalds1da177e2005-04-16 15:20:36 -070079
80
David Howells8bc16de2011-08-22 14:09:11 +010081extern struct kmem_cache *key_jar;
Linus Torvalds1da177e2005-04-16 15:20:36 -070082extern struct rb_root key_serial_tree;
83extern spinlock_t key_serial_lock;
David Howells76181c12007-10-16 23:29:46 -070084extern struct mutex key_construction_mutex;
Linus Torvalds1da177e2005-04-16 15:20:36 -070085extern wait_queue_head_t request_key_conswq;
86
87
David Howellse9e349b2008-11-14 10:39:13 +110088extern struct key_type *key_type_lookup(const char *type);
89extern void key_type_put(struct key_type *ktype);
90
David Howellsf70e2e02010-04-30 14:32:39 +010091extern int __key_link_begin(struct key *keyring,
92 const struct key_type *type,
93 const char *description,
David Howellsceb73c12011-01-25 16:34:28 +000094 unsigned long *_prealloc);
David Howellsf70e2e02010-04-30 14:32:39 +010095extern int __key_link_check_live_key(struct key *keyring, struct key *key);
96extern void __key_link(struct key *keyring, struct key *key,
David Howellsceb73c12011-01-25 16:34:28 +000097 unsigned long *_prealloc);
David Howellsf70e2e02010-04-30 14:32:39 +010098extern void __key_link_end(struct key *keyring,
99 struct key_type *type,
David Howellsceb73c12011-01-25 16:34:28 +0000100 unsigned long prealloc);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700101
David Howells664cceb2005-09-28 17:03:15 +0100102extern key_ref_t __keyring_search_one(key_ref_t keyring_ref,
103 const struct key_type *type,
104 const char *description,
105 key_perm_t perm);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700106
David Howells3e301482005-06-23 22:00:56 -0700107extern struct key *keyring_search_instkey(struct key *keyring,
108 key_serial_t target_id);
109
Linus Torvalds1da177e2005-04-16 15:20:36 -0700110typedef int (*key_match_func_t)(const struct key *, const void *);
111
David Howells664cceb2005-09-28 17:03:15 +0100112extern key_ref_t keyring_search_aux(key_ref_t keyring_ref,
David Howellsd84f4f92008-11-14 10:39:23 +1100113 const struct cred *cred,
David Howells664cceb2005-09-28 17:03:15 +0100114 struct key_type *type,
115 const void *description,
David Howells78b72802011-03-11 17:57:23 +0000116 key_match_func_t match,
117 bool no_state_check);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700118
David Howells927942a2010-06-11 17:31:10 +0100119extern key_ref_t search_my_process_keyrings(struct key_type *type,
120 const void *description,
121 key_match_func_t match,
David Howells78b72802011-03-11 17:57:23 +0000122 bool no_state_check,
David Howells927942a2010-06-11 17:31:10 +0100123 const struct cred *cred);
David Howells664cceb2005-09-28 17:03:15 +0100124extern key_ref_t search_process_keyrings(struct key_type *type,
125 const void *description,
126 key_match_func_t match,
David Howellsd84f4f92008-11-14 10:39:23 +1100127 const struct cred *cred);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700128
David Howells69664cf2008-04-29 01:01:31 -0700129extern struct key *find_keyring_by_name(const char *name, bool skip_perm_check);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700130
David Howells8bbf49762008-11-14 10:39:14 +1100131extern int install_user_keyrings(void);
David Howellsd84f4f92008-11-14 10:39:23 +1100132extern int install_thread_keyring_to_cred(struct cred *);
133extern int install_process_keyring_to_cred(struct cred *);
Oleg Nesterov685bfd22010-05-26 14:43:00 -0700134extern int install_session_keyring_to_cred(struct cred *, struct key *);
David Howells3e301482005-06-23 22:00:56 -0700135
136extern struct key *request_key_and_link(struct key_type *type,
137 const char *description,
David Howells4a38e122008-04-29 01:01:24 -0700138 const void *callout_info,
139 size_t callout_len,
David Howells4e54f082006-06-29 02:24:28 -0700140 void *aux,
David Howells7e047ef2006-06-26 00:24:50 -0700141 struct key *dest_keyring,
142 unsigned long flags);
David Howells3e301482005-06-23 22:00:56 -0700143
David Howells927942a2010-06-11 17:31:10 +0100144extern int lookup_user_key_possessed(const struct key *key, const void *target);
David Howells55931222009-09-02 09:13:45 +0100145extern key_ref_t lookup_user_key(key_serial_t id, unsigned long flags,
David Howellse9e349b2008-11-14 10:39:13 +1100146 key_perm_t perm);
David Howells55931222009-09-02 09:13:45 +0100147#define KEY_LOOKUP_CREATE 0x01
148#define KEY_LOOKUP_PARTIAL 0x02
149#define KEY_LOOKUP_FOR_UNLINK 0x04
David Howellse9e349b2008-11-14 10:39:13 +1100150
151extern long join_session_keyring(const char *name);
Al Viro67d12142012-06-27 11:07:19 +0400152extern void key_change_session_keyring(struct callback_head *twork);
David Howellse9e349b2008-11-14 10:39:13 +1100153
David Howells0c061b52011-08-22 14:09:36 +0100154extern struct work_struct key_gc_work;
David Howells5d135442009-09-02 09:14:00 +0100155extern unsigned key_gc_delay;
156extern void keyring_gc(struct key *keyring, time_t limit);
David Howellsfd758152012-05-11 10:56:56 +0100157extern void key_schedule_gc(time_t gc_at);
158extern void key_schedule_gc_links(void);
David Howells0c061b52011-08-22 14:09:36 +0100159extern void key_gc_keytype(struct key_type *ktype);
David Howells5d135442009-09-02 09:14:00 +0100160
David Howellse9e349b2008-11-14 10:39:13 +1100161extern int key_task_permission(const key_ref_t key_ref,
David Howellsd84f4f92008-11-14 10:39:23 +1100162 const struct cred *cred,
David Howellse9e349b2008-11-14 10:39:13 +1100163 key_perm_t perm);
164
David Howells973c9f42011-01-20 16:38:33 +0000165/*
166 * Check to see whether permission is granted to use a key in the desired way.
167 */
David Howellse9e349b2008-11-14 10:39:13 +1100168static inline int key_permission(const key_ref_t key_ref, key_perm_t perm)
169{
David Howellsd84f4f92008-11-14 10:39:23 +1100170 return key_task_permission(key_ref, current_cred(), perm);
David Howellse9e349b2008-11-14 10:39:13 +1100171}
172
173/* required permissions */
174#define KEY_VIEW 0x01 /* require permission to view attributes */
175#define KEY_READ 0x02 /* require permission to read content */
176#define KEY_WRITE 0x04 /* require permission to update / modify */
177#define KEY_SEARCH 0x08 /* require permission to search (keyring) or find (key) */
178#define KEY_LINK 0x10 /* require permission to link */
179#define KEY_SETATTR 0x20 /* require permission to change attributes */
180#define KEY_ALL 0x3f /* all the above permissions */
181
David Howells3e301482005-06-23 22:00:56 -0700182/*
David Howells973c9f42011-01-20 16:38:33 +0000183 * Authorisation record for request_key().
David Howells3e301482005-06-23 22:00:56 -0700184 */
185struct request_key_auth {
186 struct key *target_key;
David Howells8bbf49762008-11-14 10:39:14 +1100187 struct key *dest_keyring;
David Howellsd84f4f92008-11-14 10:39:23 +1100188 const struct cred *cred;
David Howells4a38e122008-04-29 01:01:24 -0700189 void *callout_info;
190 size_t callout_len;
David Howells3e301482005-06-23 22:00:56 -0700191 pid_t pid;
192};
193
194extern struct key_type key_type_request_key_auth;
195extern struct key *request_key_auth_new(struct key *target,
David Howells4a38e122008-04-29 01:01:24 -0700196 const void *callout_info,
David Howells8bbf49762008-11-14 10:39:14 +1100197 size_t callout_len,
198 struct key *dest_keyring);
David Howells3e301482005-06-23 22:00:56 -0700199
200extern struct key *key_get_instantiation_authkey(key_serial_t target_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700201
202/*
David Howellsfd758152012-05-11 10:56:56 +0100203 * Determine whether a key is dead.
204 */
205static inline bool key_is_dead(struct key *key, time_t limit)
206{
207 return
208 key->flags & ((1 << KEY_FLAG_DEAD) |
209 (1 << KEY_FLAG_INVALIDATED)) ||
210 (key->expiry > 0 && key->expiry <= limit);
211}
212
213/*
David Howells973c9f42011-01-20 16:38:33 +0000214 * keyctl() functions
Linus Torvalds1da177e2005-04-16 15:20:36 -0700215 */
216extern long keyctl_get_keyring_ID(key_serial_t, int);
217extern long keyctl_join_session_keyring(const char __user *);
218extern long keyctl_update_key(key_serial_t, const void __user *, size_t);
219extern long keyctl_revoke_key(key_serial_t);
220extern long keyctl_keyring_clear(key_serial_t);
221extern long keyctl_keyring_link(key_serial_t, key_serial_t);
222extern long keyctl_keyring_unlink(key_serial_t, key_serial_t);
223extern long keyctl_describe_key(key_serial_t, char __user *, size_t);
224extern long keyctl_keyring_search(key_serial_t, const char __user *,
225 const char __user *, key_serial_t);
226extern long keyctl_read_key(key_serial_t, char __user *, size_t);
227extern long keyctl_chown_key(key_serial_t, uid_t, gid_t);
228extern long keyctl_setperm_key(key_serial_t, key_perm_t);
229extern long keyctl_instantiate_key(key_serial_t, const void __user *,
230 size_t, key_serial_t);
231extern long keyctl_negate_key(key_serial_t, unsigned, key_serial_t);
David Howells3e301482005-06-23 22:00:56 -0700232extern long keyctl_set_reqkey_keyring(int);
David Howells017679c2006-01-08 01:02:43 -0800233extern long keyctl_set_timeout(key_serial_t, unsigned);
David Howellsb5f545c2006-01-08 01:02:47 -0800234extern long keyctl_assume_authority(key_serial_t);
David Howells70a5bb72008-04-29 01:01:26 -0700235extern long keyctl_get_security(key_serial_t keyid, char __user *buffer,
236 size_t buflen);
David Howellsee18d642009-09-02 09:14:21 +0100237extern long keyctl_session_to_parent(void);
David Howellsfdd1b942011-03-07 15:06:09 +0000238extern long keyctl_reject_key(key_serial_t, unsigned, unsigned, key_serial_t);
David Howellsee009e4a02011-03-07 15:06:20 +0000239extern long keyctl_instantiate_key_iov(key_serial_t,
240 const struct iovec __user *,
241 unsigned, key_serial_t);
David Howellsfd758152012-05-11 10:56:56 +0100242extern long keyctl_invalidate_key(key_serial_t);
David Howellsee009e4a02011-03-07 15:06:20 +0000243
244extern long keyctl_instantiate_key_common(key_serial_t,
David Howells423b97882012-05-21 12:32:13 +0100245 const struct iovec *,
David Howellsee009e4a02011-03-07 15:06:20 +0000246 unsigned, size_t, key_serial_t);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700247
248/*
David Howells973c9f42011-01-20 16:38:33 +0000249 * Debugging key validation
Linus Torvalds1da177e2005-04-16 15:20:36 -0700250 */
251#ifdef KEY_DEBUGGING
252extern void __key_check(const struct key *);
253
254static inline void key_check(const struct key *key)
255{
256 if (key && (IS_ERR(key) || key->magic != KEY_DEBUG_MAGIC))
257 __key_check(key);
258}
259
260#else
261
262#define key_check(key) do {} while(0)
263
264#endif
265
266#endif /* _INTERNAL_H */