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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/* proc.c: proc files for key database enumeration
2 *
3 * Copyright (C) 2004 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#include <linux/module.h>
13#include <linux/init.h>
14#include <linux/sched.h>
15#include <linux/slab.h>
16#include <linux/fs.h>
17#include <linux/proc_fs.h>
18#include <linux/seq_file.h>
19#include <asm/errno.h>
20#include "internal.h"
21
22#ifdef CONFIG_KEYS_DEBUG_PROC_KEYS
23static int proc_keys_open(struct inode *inode, struct file *file);
24static void *proc_keys_start(struct seq_file *p, loff_t *_pos);
25static void *proc_keys_next(struct seq_file *p, void *v, loff_t *_pos);
26static void proc_keys_stop(struct seq_file *p, void *v);
27static int proc_keys_show(struct seq_file *m, void *v);
28
Jan Engelhardt1996a102008-01-23 00:02:58 +010029static const struct seq_operations proc_keys_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -070030 .start = proc_keys_start,
31 .next = proc_keys_next,
32 .stop = proc_keys_stop,
33 .show = proc_keys_show,
34};
35
Arjan van de Ven9c2e08c2007-02-12 00:55:37 -080036static const struct file_operations proc_keys_fops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -070037 .open = proc_keys_open,
38 .read = seq_read,
39 .llseek = seq_lseek,
40 .release = seq_release,
41};
42#endif
43
44static int proc_key_users_open(struct inode *inode, struct file *file);
45static void *proc_key_users_start(struct seq_file *p, loff_t *_pos);
46static void *proc_key_users_next(struct seq_file *p, void *v, loff_t *_pos);
47static void proc_key_users_stop(struct seq_file *p, void *v);
48static int proc_key_users_show(struct seq_file *m, void *v);
49
Jan Engelhardt1996a102008-01-23 00:02:58 +010050static const struct seq_operations proc_key_users_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -070051 .start = proc_key_users_start,
52 .next = proc_key_users_next,
53 .stop = proc_key_users_stop,
54 .show = proc_key_users_show,
55};
56
Arjan van de Ven9c2e08c2007-02-12 00:55:37 -080057static const struct file_operations proc_key_users_fops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -070058 .open = proc_key_users_open,
59 .read = seq_read,
60 .llseek = seq_lseek,
61 .release = seq_release,
62};
63
64/*****************************************************************************/
65/*
66 * declare the /proc files
67 */
68static int __init key_proc_init(void)
69{
70 struct proc_dir_entry *p;
71
72#ifdef CONFIG_KEYS_DEBUG_PROC_KEYS
Alexey Dobriyanda91d2e2008-04-29 01:01:27 -070073 p = proc_create("keys", 0, NULL, &proc_keys_fops);
Linus Torvalds1da177e2005-04-16 15:20:36 -070074 if (!p)
75 panic("Cannot create /proc/keys\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -070076#endif
77
Alexey Dobriyanda91d2e2008-04-29 01:01:27 -070078 p = proc_create("key-users", 0, NULL, &proc_key_users_fops);
Linus Torvalds1da177e2005-04-16 15:20:36 -070079 if (!p)
80 panic("Cannot create /proc/key-users\n");
81
Linus Torvalds1da177e2005-04-16 15:20:36 -070082 return 0;
83
84} /* end key_proc_init() */
85
86__initcall(key_proc_init);
87
88/*****************************************************************************/
89/*
90 * implement "/proc/keys" to provides a list of the keys on the system
91 */
92#ifdef CONFIG_KEYS_DEBUG_PROC_KEYS
93
Serge E. Hallyn454804a2009-02-26 18:28:04 -060094static struct rb_node *__key_serial_next(struct rb_node *n)
95{
96 while (n) {
97 struct key *key = rb_entry(n, struct key, serial_node);
98 if (key->user->user_ns == current_user_ns())
99 break;
100 n = rb_next(n);
101 }
102 return n;
103}
104
105static struct rb_node *key_serial_next(struct rb_node *n)
106{
107 return __key_serial_next(rb_next(n));
108}
109
110static struct rb_node *key_serial_first(struct rb_root *r)
111{
112 struct rb_node *n = rb_first(r);
113 return __key_serial_next(n);
114}
115
Linus Torvalds1da177e2005-04-16 15:20:36 -0700116static int proc_keys_open(struct inode *inode, struct file *file)
117{
118 return seq_open(file, &proc_keys_ops);
119
120}
121
122static void *proc_keys_start(struct seq_file *p, loff_t *_pos)
123{
124 struct rb_node *_p;
125 loff_t pos = *_pos;
126
127 spin_lock(&key_serial_lock);
128
Serge E. Hallyn454804a2009-02-26 18:28:04 -0600129 _p = key_serial_first(&key_serial_tree);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700130 while (pos > 0 && _p) {
131 pos--;
Serge E. Hallyn454804a2009-02-26 18:28:04 -0600132 _p = key_serial_next(_p);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700133 }
134
135 return _p;
136
137}
138
139static void *proc_keys_next(struct seq_file *p, void *v, loff_t *_pos)
140{
141 (*_pos)++;
Serge E. Hallyn454804a2009-02-26 18:28:04 -0600142 return key_serial_next((struct rb_node *) v);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700143
144}
145
146static void proc_keys_stop(struct seq_file *p, void *v)
147{
148 spin_unlock(&key_serial_lock);
149}
150
151static int proc_keys_show(struct seq_file *m, void *v)
152{
153 struct rb_node *_p = v;
154 struct key *key = rb_entry(_p, struct key, serial_node);
155 struct timespec now;
156 unsigned long timo;
157 char xbuf[12];
Michael LeMay06ec7be2006-06-26 00:24:56 -0700158 int rc;
159
160 /* check whether the current task is allowed to view the key (assuming
David Howellsd84f4f92008-11-14 10:39:23 +1100161 * non-possession)
162 * - the caller holds a spinlock, and thus the RCU read lock, making our
163 * access to __current_cred() safe
164 */
165 rc = key_task_permission(make_key_ref(key, 0), current_cred(),
166 KEY_VIEW);
Michael LeMay06ec7be2006-06-26 00:24:56 -0700167 if (rc < 0)
168 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700169
170 now = current_kernel_time();
171
David Howells76d8aea2005-06-23 22:00:49 -0700172 rcu_read_lock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700173
174 /* come up with a suitable timeout value */
175 if (key->expiry == 0) {
176 memcpy(xbuf, "perm", 5);
177 }
178 else if (now.tv_sec >= key->expiry) {
179 memcpy(xbuf, "expd", 5);
180 }
181 else {
182 timo = key->expiry - now.tv_sec;
183
184 if (timo < 60)
185 sprintf(xbuf, "%lus", timo);
186 else if (timo < 60*60)
187 sprintf(xbuf, "%lum", timo / 60);
188 else if (timo < 60*60*24)
189 sprintf(xbuf, "%luh", timo / (60*60));
190 else if (timo < 60*60*24*7)
191 sprintf(xbuf, "%lud", timo / (60*60*24));
192 else
193 sprintf(xbuf, "%luw", timo / (60*60*24*7));
194 }
195
David Howells76d8aea2005-06-23 22:00:49 -0700196#define showflag(KEY, LETTER, FLAG) \
197 (test_bit(FLAG, &(KEY)->flags) ? LETTER : '-')
198
David Howells664cceb2005-09-28 17:03:15 +0100199 seq_printf(m, "%08x %c%c%c%c%c%c %5d %4s %08x %5d %5d %-9.9s ",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700200 key->serial,
David Howells76d8aea2005-06-23 22:00:49 -0700201 showflag(key, 'I', KEY_FLAG_INSTANTIATED),
202 showflag(key, 'R', KEY_FLAG_REVOKED),
203 showflag(key, 'D', KEY_FLAG_DEAD),
204 showflag(key, 'Q', KEY_FLAG_IN_QUOTA),
205 showflag(key, 'U', KEY_FLAG_USER_CONSTRUCT),
206 showflag(key, 'N', KEY_FLAG_NEGATIVE),
Linus Torvalds1da177e2005-04-16 15:20:36 -0700207 atomic_read(&key->usage),
208 xbuf,
209 key->perm,
210 key->uid,
211 key->gid,
212 key->type->name);
213
David Howells76d8aea2005-06-23 22:00:49 -0700214#undef showflag
215
Linus Torvalds1da177e2005-04-16 15:20:36 -0700216 if (key->type->describe)
217 key->type->describe(key, m);
218 seq_putc(m, '\n');
219
David Howells76d8aea2005-06-23 22:00:49 -0700220 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700221
222 return 0;
223
224}
225
226#endif /* CONFIG_KEYS_DEBUG_PROC_KEYS */
227
Serge E. Hallyn454804a2009-02-26 18:28:04 -0600228static struct rb_node *__key_user_next(struct rb_node *n)
229{
230 while (n) {
231 struct key_user *user = rb_entry(n, struct key_user, node);
232 if (user->user_ns == current_user_ns())
233 break;
234 n = rb_next(n);
235 }
236 return n;
237}
238
239static struct rb_node *key_user_next(struct rb_node *n)
240{
241 return __key_user_next(rb_next(n));
242}
243
244static struct rb_node *key_user_first(struct rb_root *r)
245{
246 struct rb_node *n = rb_first(r);
247 return __key_user_next(n);
248}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700249/*****************************************************************************/
250/*
251 * implement "/proc/key-users" to provides a list of the key users
252 */
253static int proc_key_users_open(struct inode *inode, struct file *file)
254{
255 return seq_open(file, &proc_key_users_ops);
256
257}
258
259static void *proc_key_users_start(struct seq_file *p, loff_t *_pos)
260{
261 struct rb_node *_p;
262 loff_t pos = *_pos;
263
264 spin_lock(&key_user_lock);
265
Serge E. Hallyn454804a2009-02-26 18:28:04 -0600266 _p = key_user_first(&key_user_tree);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700267 while (pos > 0 && _p) {
268 pos--;
Serge E. Hallyn454804a2009-02-26 18:28:04 -0600269 _p = key_user_next(_p);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700270 }
271
272 return _p;
273
274}
275
276static void *proc_key_users_next(struct seq_file *p, void *v, loff_t *_pos)
277{
278 (*_pos)++;
Serge E. Hallyn454804a2009-02-26 18:28:04 -0600279 return key_user_next((struct rb_node *) v);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700280
281}
282
283static void proc_key_users_stop(struct seq_file *p, void *v)
284{
285 spin_unlock(&key_user_lock);
286}
287
288static int proc_key_users_show(struct seq_file *m, void *v)
289{
290 struct rb_node *_p = v;
291 struct key_user *user = rb_entry(_p, struct key_user, node);
David Howells0b77f5b2008-04-29 01:01:32 -0700292 unsigned maxkeys = (user->uid == 0) ?
293 key_quota_root_maxkeys : key_quota_maxkeys;
294 unsigned maxbytes = (user->uid == 0) ?
295 key_quota_root_maxbytes : key_quota_maxbytes;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700296
297 seq_printf(m, "%5u: %5d %d/%d %d/%d %d/%d\n",
298 user->uid,
299 atomic_read(&user->usage),
300 atomic_read(&user->nkeys),
301 atomic_read(&user->nikeys),
302 user->qnkeys,
David Howells0b77f5b2008-04-29 01:01:32 -0700303 maxkeys,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700304 user->qnbytes,
David Howells0b77f5b2008-04-29 01:01:32 -0700305 maxbytes);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700306
307 return 0;
308
309}