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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>
Linus Torvalds1da177e2005-04-16 15:20:36 -070015#include <linux/fs.h>
16#include <linux/proc_fs.h>
17#include <linux/seq_file.h>
18#include <asm/errno.h>
19#include "internal.h"
20
21#ifdef CONFIG_KEYS_DEBUG_PROC_KEYS
22static int proc_keys_open(struct inode *inode, struct file *file);
23static void *proc_keys_start(struct seq_file *p, loff_t *_pos);
24static void *proc_keys_next(struct seq_file *p, void *v, loff_t *_pos);
25static void proc_keys_stop(struct seq_file *p, void *v);
26static int proc_keys_show(struct seq_file *m, void *v);
27
Jan Engelhardt1996a102008-01-23 00:02:58 +010028static const struct seq_operations proc_keys_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -070029 .start = proc_keys_start,
30 .next = proc_keys_next,
31 .stop = proc_keys_stop,
32 .show = proc_keys_show,
33};
34
Arjan van de Ven9c2e08c2007-02-12 00:55:37 -080035static const struct file_operations proc_keys_fops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -070036 .open = proc_keys_open,
37 .read = seq_read,
38 .llseek = seq_lseek,
39 .release = seq_release,
40};
41#endif
42
43static int proc_key_users_open(struct inode *inode, struct file *file);
44static void *proc_key_users_start(struct seq_file *p, loff_t *_pos);
45static void *proc_key_users_next(struct seq_file *p, void *v, loff_t *_pos);
46static void proc_key_users_stop(struct seq_file *p, void *v);
47static int proc_key_users_show(struct seq_file *m, void *v);
48
Jan Engelhardt1996a102008-01-23 00:02:58 +010049static const struct seq_operations proc_key_users_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -070050 .start = proc_key_users_start,
51 .next = proc_key_users_next,
52 .stop = proc_key_users_stop,
53 .show = proc_key_users_show,
54};
55
Arjan van de Ven9c2e08c2007-02-12 00:55:37 -080056static const struct file_operations proc_key_users_fops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -070057 .open = proc_key_users_open,
58 .read = seq_read,
59 .llseek = seq_lseek,
60 .release = seq_release,
61};
62
63/*****************************************************************************/
64/*
65 * declare the /proc files
66 */
67static int __init key_proc_init(void)
68{
69 struct proc_dir_entry *p;
70
71#ifdef CONFIG_KEYS_DEBUG_PROC_KEYS
Alexey Dobriyanda91d2e2008-04-29 01:01:27 -070072 p = proc_create("keys", 0, NULL, &proc_keys_fops);
Linus Torvalds1da177e2005-04-16 15:20:36 -070073 if (!p)
74 panic("Cannot create /proc/keys\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -070075#endif
76
Alexey Dobriyanda91d2e2008-04-29 01:01:27 -070077 p = proc_create("key-users", 0, NULL, &proc_key_users_fops);
Linus Torvalds1da177e2005-04-16 15:20:36 -070078 if (!p)
79 panic("Cannot create /proc/key-users\n");
80
Linus Torvalds1da177e2005-04-16 15:20:36 -070081 return 0;
82
83} /* end key_proc_init() */
84
85__initcall(key_proc_init);
86
87/*****************************************************************************/
88/*
89 * implement "/proc/keys" to provides a list of the keys on the system
90 */
91#ifdef CONFIG_KEYS_DEBUG_PROC_KEYS
92
Serge E. Hallynad73a712009-09-02 09:14:05 +010093static struct rb_node *key_serial_next(struct rb_node *n)
Serge E. Hallyn454804a2009-02-26 18:28:04 -060094{
Serge E. Hallynad73a712009-09-02 09:14:05 +010095 struct user_namespace *user_ns = current_user_ns();
96
97 n = rb_next(n);
Serge E. Hallyn454804a2009-02-26 18:28:04 -060098 while (n) {
99 struct key *key = rb_entry(n, struct key, serial_node);
Serge E. Hallynad73a712009-09-02 09:14:05 +0100100 if (key->user->user_ns == user_ns)
Serge E. Hallyn454804a2009-02-26 18:28:04 -0600101 break;
102 n = rb_next(n);
103 }
104 return n;
105}
106
Linus Torvalds1da177e2005-04-16 15:20:36 -0700107static int proc_keys_open(struct inode *inode, struct file *file)
108{
109 return seq_open(file, &proc_keys_ops);
Serge E. Hallynad73a712009-09-02 09:14:05 +0100110}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700111
Serge E. Hallynad73a712009-09-02 09:14:05 +0100112static struct key *find_ge_key(key_serial_t id)
113{
114 struct user_namespace *user_ns = current_user_ns();
115 struct rb_node *n = key_serial_tree.rb_node;
116 struct key *minkey = NULL;
117
118 while (n) {
119 struct key *key = rb_entry(n, struct key, serial_node);
120 if (id < key->serial) {
121 if (!minkey || minkey->serial > key->serial)
122 minkey = key;
123 n = n->rb_left;
124 } else if (id > key->serial) {
125 n = n->rb_right;
126 } else {
127 minkey = key;
128 break;
129 }
130 key = NULL;
131 }
132
133 if (!minkey)
134 return NULL;
135
136 for (;;) {
137 if (minkey->user->user_ns == user_ns)
138 return minkey;
139 n = rb_next(&minkey->serial_node);
140 if (!n)
141 return NULL;
142 minkey = rb_entry(n, struct key, serial_node);
143 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700144}
145
146static void *proc_keys_start(struct seq_file *p, loff_t *_pos)
James Morris86abcf92009-06-18 22:00:05 +1000147 __acquires(key_serial_lock)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700148{
Serge E. Hallynad73a712009-09-02 09:14:05 +0100149 key_serial_t pos = *_pos;
150 struct key *key;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700151
152 spin_lock(&key_serial_lock);
153
Serge E. Hallynad73a712009-09-02 09:14:05 +0100154 if (*_pos > INT_MAX)
155 return NULL;
156 key = find_ge_key(pos);
157 if (!key)
158 return NULL;
159 *_pos = key->serial;
160 return &key->serial_node;
161}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700162
Serge E. Hallynad73a712009-09-02 09:14:05 +0100163static inline key_serial_t key_node_serial(struct rb_node *n)
164{
165 struct key *key = rb_entry(n, struct key, serial_node);
166 return key->serial;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700167}
168
169static void *proc_keys_next(struct seq_file *p, void *v, loff_t *_pos)
170{
Serge E. Hallynad73a712009-09-02 09:14:05 +0100171 struct rb_node *n;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700172
Serge E. Hallynad73a712009-09-02 09:14:05 +0100173 n = key_serial_next(v);
174 if (n)
175 *_pos = key_node_serial(n);
176 return n;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700177}
178
179static void proc_keys_stop(struct seq_file *p, void *v)
James Morris86abcf92009-06-18 22:00:05 +1000180 __releases(key_serial_lock)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700181{
182 spin_unlock(&key_serial_lock);
183}
184
185static int proc_keys_show(struct seq_file *m, void *v)
186{
187 struct rb_node *_p = v;
188 struct key *key = rb_entry(_p, struct key, serial_node);
189 struct timespec now;
190 unsigned long timo;
191 char xbuf[12];
Michael LeMay06ec7be2006-06-26 00:24:56 -0700192 int rc;
193
194 /* check whether the current task is allowed to view the key (assuming
David Howellsd84f4f92008-11-14 10:39:23 +1100195 * non-possession)
196 * - the caller holds a spinlock, and thus the RCU read lock, making our
197 * access to __current_cred() safe
198 */
199 rc = key_task_permission(make_key_ref(key, 0), current_cred(),
200 KEY_VIEW);
Michael LeMay06ec7be2006-06-26 00:24:56 -0700201 if (rc < 0)
202 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700203
204 now = current_kernel_time();
205
David Howells76d8aea2005-06-23 22:00:49 -0700206 rcu_read_lock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700207
208 /* come up with a suitable timeout value */
209 if (key->expiry == 0) {
210 memcpy(xbuf, "perm", 5);
David Howells7b1b9162009-09-02 09:14:11 +0100211 } else if (now.tv_sec >= key->expiry) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700212 memcpy(xbuf, "expd", 5);
David Howells7b1b9162009-09-02 09:14:11 +0100213 } else {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700214 timo = key->expiry - now.tv_sec;
215
216 if (timo < 60)
217 sprintf(xbuf, "%lus", timo);
218 else if (timo < 60*60)
219 sprintf(xbuf, "%lum", timo / 60);
220 else if (timo < 60*60*24)
221 sprintf(xbuf, "%luh", timo / (60*60));
222 else if (timo < 60*60*24*7)
223 sprintf(xbuf, "%lud", timo / (60*60*24));
224 else
225 sprintf(xbuf, "%luw", timo / (60*60*24*7));
226 }
227
David Howells76d8aea2005-06-23 22:00:49 -0700228#define showflag(KEY, LETTER, FLAG) \
229 (test_bit(FLAG, &(KEY)->flags) ? LETTER : '-')
230
David Howells664cceb2005-09-28 17:03:15 +0100231 seq_printf(m, "%08x %c%c%c%c%c%c %5d %4s %08x %5d %5d %-9.9s ",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700232 key->serial,
David Howells76d8aea2005-06-23 22:00:49 -0700233 showflag(key, 'I', KEY_FLAG_INSTANTIATED),
234 showflag(key, 'R', KEY_FLAG_REVOKED),
235 showflag(key, 'D', KEY_FLAG_DEAD),
236 showflag(key, 'Q', KEY_FLAG_IN_QUOTA),
237 showflag(key, 'U', KEY_FLAG_USER_CONSTRUCT),
238 showflag(key, 'N', KEY_FLAG_NEGATIVE),
Linus Torvalds1da177e2005-04-16 15:20:36 -0700239 atomic_read(&key->usage),
240 xbuf,
241 key->perm,
242 key->uid,
243 key->gid,
244 key->type->name);
245
David Howells76d8aea2005-06-23 22:00:49 -0700246#undef showflag
247
Linus Torvalds1da177e2005-04-16 15:20:36 -0700248 if (key->type->describe)
249 key->type->describe(key, m);
250 seq_putc(m, '\n');
251
David Howells76d8aea2005-06-23 22:00:49 -0700252 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700253 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700254}
255
256#endif /* CONFIG_KEYS_DEBUG_PROC_KEYS */
257
Serge E. Hallyn454804a2009-02-26 18:28:04 -0600258static struct rb_node *__key_user_next(struct rb_node *n)
259{
260 while (n) {
261 struct key_user *user = rb_entry(n, struct key_user, node);
262 if (user->user_ns == current_user_ns())
263 break;
264 n = rb_next(n);
265 }
266 return n;
267}
268
269static struct rb_node *key_user_next(struct rb_node *n)
270{
271 return __key_user_next(rb_next(n));
272}
273
274static struct rb_node *key_user_first(struct rb_root *r)
275{
276 struct rb_node *n = rb_first(r);
277 return __key_user_next(n);
278}
David Howells7b1b9162009-09-02 09:14:11 +0100279
Linus Torvalds1da177e2005-04-16 15:20:36 -0700280/*****************************************************************************/
281/*
282 * implement "/proc/key-users" to provides a list of the key users
283 */
284static int proc_key_users_open(struct inode *inode, struct file *file)
285{
286 return seq_open(file, &proc_key_users_ops);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700287}
288
289static void *proc_key_users_start(struct seq_file *p, loff_t *_pos)
James Morris86abcf92009-06-18 22:00:05 +1000290 __acquires(key_user_lock)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700291{
292 struct rb_node *_p;
293 loff_t pos = *_pos;
294
295 spin_lock(&key_user_lock);
296
Serge E. Hallyn454804a2009-02-26 18:28:04 -0600297 _p = key_user_first(&key_user_tree);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700298 while (pos > 0 && _p) {
299 pos--;
Serge E. Hallyn454804a2009-02-26 18:28:04 -0600300 _p = key_user_next(_p);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700301 }
302
303 return _p;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700304}
305
306static void *proc_key_users_next(struct seq_file *p, void *v, loff_t *_pos)
307{
308 (*_pos)++;
Justin P. Mattockc5b60b52010-04-21 00:02:11 -0700309 return key_user_next((struct rb_node *)v);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700310}
311
312static void proc_key_users_stop(struct seq_file *p, void *v)
James Morris86abcf92009-06-18 22:00:05 +1000313 __releases(key_user_lock)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700314{
315 spin_unlock(&key_user_lock);
316}
317
318static int proc_key_users_show(struct seq_file *m, void *v)
319{
320 struct rb_node *_p = v;
321 struct key_user *user = rb_entry(_p, struct key_user, node);
David Howells0b77f5b2008-04-29 01:01:32 -0700322 unsigned maxkeys = (user->uid == 0) ?
323 key_quota_root_maxkeys : key_quota_maxkeys;
324 unsigned maxbytes = (user->uid == 0) ?
325 key_quota_root_maxbytes : key_quota_maxbytes;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700326
327 seq_printf(m, "%5u: %5d %d/%d %d/%d %d/%d\n",
328 user->uid,
329 atomic_read(&user->usage),
330 atomic_read(&user->nkeys),
331 atomic_read(&user->nikeys),
332 user->qnkeys,
David Howells0b77f5b2008-04-29 01:01:32 -0700333 maxkeys,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700334 user->qnbytes,
David Howells0b77f5b2008-04-29 01:01:32 -0700335 maxbytes);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700336
337 return 0;
338
339}