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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,
David Howells16feef42013-09-24 10:35:15 +010092 const struct keyring_index_key *index_key,
David Howellsb2a4df22013-09-24 10:35:18 +010093 struct assoc_array_edit **_edit);
David Howellsf70e2e02010-04-30 14:32:39 +010094extern int __key_link_check_live_key(struct key *keyring, struct key *key);
David Howellsb2a4df22013-09-24 10:35:18 +010095extern void __key_link(struct key *key, struct assoc_array_edit **_edit);
David Howellsf70e2e02010-04-30 14:32:39 +010096extern void __key_link_end(struct key *keyring,
David Howells16feef42013-09-24 10:35:15 +010097 const struct keyring_index_key *index_key,
David Howellsb2a4df22013-09-24 10:35:18 +010098 struct assoc_array_edit *edit);
Linus Torvalds1da177e2005-04-16 15:20:36 -070099
David Howellsb2a4df22013-09-24 10:35:18 +0100100extern key_ref_t find_key_to_update(key_ref_t keyring_ref,
101 const struct keyring_index_key *index_key);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700102
David Howells3e301482005-06-23 22:00:56 -0700103extern struct key *keyring_search_instkey(struct key *keyring,
104 key_serial_t target_id);
105
David Howellsb2a4df22013-09-24 10:35:18 +0100106extern int iterate_over_keyring(const struct key *keyring,
107 int (*func)(const struct key *key, void *data),
108 void *data);
109
Linus Torvalds1da177e2005-04-16 15:20:36 -0700110typedef int (*key_match_func_t)(const struct key *, const void *);
111
David Howells4bdf0bc2013-09-24 10:35:15 +0100112struct 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 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700124
David Howellsb2a4df22013-09-24 10:35:18 +0100125 int (*iterator)(const void *object, void *iterator_data);
126
David Howells4bdf0bc2013-09-24 10:35:15 +0100127 /* 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);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700139
David Howells69664cf2008-04-29 01:01:31 -0700140extern struct key *find_keyring_by_name(const char *name, bool skip_perm_check);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700141
David Howells8bbf49762008-11-14 10:39:14 +1100142extern int install_user_keyrings(void);
David Howellsd84f4f92008-11-14 10:39:23 +1100143extern int install_thread_keyring_to_cred(struct cred *);
144extern int install_process_keyring_to_cred(struct cred *);
Oleg Nesterov685bfd22010-05-26 14:43:00 -0700145extern int install_session_keyring_to_cred(struct cred *, struct key *);
David Howells3e301482005-06-23 22:00:56 -0700146
147extern struct key *request_key_and_link(struct key_type *type,
148 const char *description,
David Howells4a38e122008-04-29 01:01:24 -0700149 const void *callout_info,
150 size_t callout_len,
David Howells4e54f082006-06-29 02:24:28 -0700151 void *aux,
David Howells7e047ef2006-06-26 00:24:50 -0700152 struct key *dest_keyring,
153 unsigned long flags);
David Howells3e301482005-06-23 22:00:56 -0700154
David Howells927942a2010-06-11 17:31:10 +0100155extern int lookup_user_key_possessed(const struct key *key, const void *target);
David Howells55931222009-09-02 09:13:45 +0100156extern key_ref_t lookup_user_key(key_serial_t id, unsigned long flags,
David Howellse9e349b2008-11-14 10:39:13 +1100157 key_perm_t perm);
David Howells55931222009-09-02 09:13:45 +0100158#define KEY_LOOKUP_CREATE 0x01
159#define KEY_LOOKUP_PARTIAL 0x02
160#define KEY_LOOKUP_FOR_UNLINK 0x04
David Howellse9e349b2008-11-14 10:39:13 +1100161
162extern long join_session_keyring(const char *name);
Al Viro67d12142012-06-27 11:07:19 +0400163extern void key_change_session_keyring(struct callback_head *twork);
David Howellse9e349b2008-11-14 10:39:13 +1100164
David Howells0c061b52011-08-22 14:09:36 +0100165extern struct work_struct key_gc_work;
David Howells5d135442009-09-02 09:14:00 +0100166extern unsigned key_gc_delay;
167extern void keyring_gc(struct key *keyring, time_t limit);
David Howellsfd758152012-05-11 10:56:56 +0100168extern void key_schedule_gc(time_t gc_at);
169extern void key_schedule_gc_links(void);
David Howells0c061b52011-08-22 14:09:36 +0100170extern void key_gc_keytype(struct key_type *ktype);
David Howells5d135442009-09-02 09:14:00 +0100171
David Howellse9e349b2008-11-14 10:39:13 +1100172extern int key_task_permission(const key_ref_t key_ref,
David Howellsd84f4f92008-11-14 10:39:23 +1100173 const struct cred *cred,
David Howellse9e349b2008-11-14 10:39:13 +1100174 key_perm_t perm);
175
David Howells973c9f42011-01-20 16:38:33 +0000176/*
177 * Check to see whether permission is granted to use a key in the desired way.
178 */
David Howellse9e349b2008-11-14 10:39:13 +1100179static inline int key_permission(const key_ref_t key_ref, key_perm_t perm)
180{
David Howellsd84f4f92008-11-14 10:39:23 +1100181 return key_task_permission(key_ref, current_cred(), perm);
David Howellse9e349b2008-11-14 10:39:13 +1100182}
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
David Howells3e301482005-06-23 22:00:56 -0700193/*
David Howells973c9f42011-01-20 16:38:33 +0000194 * Authorisation record for request_key().
David Howells3e301482005-06-23 22:00:56 -0700195 */
196struct request_key_auth {
197 struct key *target_key;
David Howells8bbf49762008-11-14 10:39:14 +1100198 struct key *dest_keyring;
David Howellsd84f4f92008-11-14 10:39:23 +1100199 const struct cred *cred;
David Howells4a38e122008-04-29 01:01:24 -0700200 void *callout_info;
201 size_t callout_len;
David Howells3e301482005-06-23 22:00:56 -0700202 pid_t pid;
203};
204
205extern struct key_type key_type_request_key_auth;
206extern struct key *request_key_auth_new(struct key *target,
David Howells4a38e122008-04-29 01:01:24 -0700207 const void *callout_info,
David Howells8bbf49762008-11-14 10:39:14 +1100208 size_t callout_len,
209 struct key *dest_keyring);
David Howells3e301482005-06-23 22:00:56 -0700210
211extern struct key *key_get_instantiation_authkey(key_serial_t target_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700212
213/*
David Howellsfd758152012-05-11 10:56:56 +0100214 * Determine whether a key is dead.
215 */
David Howells7e55ca62013-09-24 10:35:14 +0100216static inline bool key_is_dead(const struct key *key, time_t limit)
David Howellsfd758152012-05-11 10:56:56 +0100217{
218 return
219 key->flags & ((1 << KEY_FLAG_DEAD) |
220 (1 << KEY_FLAG_INVALIDATED)) ||
221 (key->expiry > 0 && key->expiry <= limit);
222}
223
224/*
David Howells973c9f42011-01-20 16:38:33 +0000225 * keyctl() functions
Linus Torvalds1da177e2005-04-16 15:20:36 -0700226 */
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);
David Howells3e301482005-06-23 22:00:56 -0700243extern long keyctl_set_reqkey_keyring(int);
David Howells017679c2006-01-08 01:02:43 -0800244extern long keyctl_set_timeout(key_serial_t, unsigned);
David Howellsb5f545c2006-01-08 01:02:47 -0800245extern long keyctl_assume_authority(key_serial_t);
David Howells70a5bb72008-04-29 01:01:26 -0700246extern long keyctl_get_security(key_serial_t keyid, char __user *buffer,
247 size_t buflen);
David Howellsee18d642009-09-02 09:14:21 +0100248extern long keyctl_session_to_parent(void);
David Howellsfdd1b942011-03-07 15:06:09 +0000249extern long keyctl_reject_key(key_serial_t, unsigned, unsigned, key_serial_t);
David Howellsee009e4a02011-03-07 15:06:20 +0000250extern long keyctl_instantiate_key_iov(key_serial_t,
251 const struct iovec __user *,
252 unsigned, key_serial_t);
David Howellsfd758152012-05-11 10:56:56 +0100253extern long keyctl_invalidate_key(key_serial_t);
David Howellsee009e4a02011-03-07 15:06:20 +0000254
255extern long keyctl_instantiate_key_common(key_serial_t,
David Howells423b97882012-05-21 12:32:13 +0100256 const struct iovec *,
David Howellsee009e4a02011-03-07 15:06:20 +0000257 unsigned, size_t, key_serial_t);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700258
259/*
David Howells973c9f42011-01-20 16:38:33 +0000260 * Debugging key validation
Linus Torvalds1da177e2005-04-16 15:20:36 -0700261 */
262#ifdef KEY_DEBUGGING
263extern void __key_check(const struct key *);
264
265static inline void key_check(const struct key *key)
266{
267 if (key && (IS_ERR(key) || key->magic != KEY_DEBUG_MAGIC))
268 __key_check(key);
269}
270
271#else
272
273#define key_check(key) do {} while(0)
274
275#endif
276
277#endif /* _INTERNAL_H */