blob: 3e0d0a6e224f5e36204c05526175d9382f6af6c6 [file] [log] [blame]
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
29static struct seq_operations proc_keys_ops = {
30 .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
50static struct seq_operations proc_key_users_ops = {
51 .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
73 p = create_proc_entry("keys", 0, NULL);
74 if (!p)
75 panic("Cannot create /proc/keys\n");
76
77 p->proc_fops = &proc_keys_fops;
78#endif
79
80 p = create_proc_entry("key-users", 0, NULL);
81 if (!p)
82 panic("Cannot create /proc/key-users\n");
83
84 p->proc_fops = &proc_key_users_fops;
85
86 return 0;
87
88} /* end key_proc_init() */
89
90__initcall(key_proc_init);
91
92/*****************************************************************************/
93/*
94 * implement "/proc/keys" to provides a list of the keys on the system
95 */
96#ifdef CONFIG_KEYS_DEBUG_PROC_KEYS
97
98static int proc_keys_open(struct inode *inode, struct file *file)
99{
100 return seq_open(file, &proc_keys_ops);
101
102}
103
104static void *proc_keys_start(struct seq_file *p, loff_t *_pos)
105{
106 struct rb_node *_p;
107 loff_t pos = *_pos;
108
109 spin_lock(&key_serial_lock);
110
111 _p = rb_first(&key_serial_tree);
112 while (pos > 0 && _p) {
113 pos--;
114 _p = rb_next(_p);
115 }
116
117 return _p;
118
119}
120
121static void *proc_keys_next(struct seq_file *p, void *v, loff_t *_pos)
122{
123 (*_pos)++;
124 return rb_next((struct rb_node *) v);
125
126}
127
128static void proc_keys_stop(struct seq_file *p, void *v)
129{
130 spin_unlock(&key_serial_lock);
131}
132
133static int proc_keys_show(struct seq_file *m, void *v)
134{
135 struct rb_node *_p = v;
136 struct key *key = rb_entry(_p, struct key, serial_node);
137 struct timespec now;
138 unsigned long timo;
139 char xbuf[12];
Michael LeMay06ec7be2006-06-26 00:24:56 -0700140 int rc;
141
142 /* check whether the current task is allowed to view the key (assuming
143 * non-possession) */
144 rc = key_task_permission(make_key_ref(key, 0), current, KEY_VIEW);
145 if (rc < 0)
146 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700147
148 now = current_kernel_time();
149
David Howells76d8aea2005-06-23 22:00:49 -0700150 rcu_read_lock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700151
152 /* come up with a suitable timeout value */
153 if (key->expiry == 0) {
154 memcpy(xbuf, "perm", 5);
155 }
156 else if (now.tv_sec >= key->expiry) {
157 memcpy(xbuf, "expd", 5);
158 }
159 else {
160 timo = key->expiry - now.tv_sec;
161
162 if (timo < 60)
163 sprintf(xbuf, "%lus", timo);
164 else if (timo < 60*60)
165 sprintf(xbuf, "%lum", timo / 60);
166 else if (timo < 60*60*24)
167 sprintf(xbuf, "%luh", timo / (60*60));
168 else if (timo < 60*60*24*7)
169 sprintf(xbuf, "%lud", timo / (60*60*24));
170 else
171 sprintf(xbuf, "%luw", timo / (60*60*24*7));
172 }
173
David Howells76d8aea2005-06-23 22:00:49 -0700174#define showflag(KEY, LETTER, FLAG) \
175 (test_bit(FLAG, &(KEY)->flags) ? LETTER : '-')
176
David Howells664cceb2005-09-28 17:03:15 +0100177 seq_printf(m, "%08x %c%c%c%c%c%c %5d %4s %08x %5d %5d %-9.9s ",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700178 key->serial,
David Howells76d8aea2005-06-23 22:00:49 -0700179 showflag(key, 'I', KEY_FLAG_INSTANTIATED),
180 showflag(key, 'R', KEY_FLAG_REVOKED),
181 showflag(key, 'D', KEY_FLAG_DEAD),
182 showflag(key, 'Q', KEY_FLAG_IN_QUOTA),
183 showflag(key, 'U', KEY_FLAG_USER_CONSTRUCT),
184 showflag(key, 'N', KEY_FLAG_NEGATIVE),
Linus Torvalds1da177e2005-04-16 15:20:36 -0700185 atomic_read(&key->usage),
186 xbuf,
187 key->perm,
188 key->uid,
189 key->gid,
190 key->type->name);
191
David Howells76d8aea2005-06-23 22:00:49 -0700192#undef showflag
193
Linus Torvalds1da177e2005-04-16 15:20:36 -0700194 if (key->type->describe)
195 key->type->describe(key, m);
196 seq_putc(m, '\n');
197
David Howells76d8aea2005-06-23 22:00:49 -0700198 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700199
200 return 0;
201
202}
203
204#endif /* CONFIG_KEYS_DEBUG_PROC_KEYS */
205
206/*****************************************************************************/
207/*
208 * implement "/proc/key-users" to provides a list of the key users
209 */
210static int proc_key_users_open(struct inode *inode, struct file *file)
211{
212 return seq_open(file, &proc_key_users_ops);
213
214}
215
216static void *proc_key_users_start(struct seq_file *p, loff_t *_pos)
217{
218 struct rb_node *_p;
219 loff_t pos = *_pos;
220
221 spin_lock(&key_user_lock);
222
223 _p = rb_first(&key_user_tree);
224 while (pos > 0 && _p) {
225 pos--;
226 _p = rb_next(_p);
227 }
228
229 return _p;
230
231}
232
233static void *proc_key_users_next(struct seq_file *p, void *v, loff_t *_pos)
234{
235 (*_pos)++;
236 return rb_next((struct rb_node *) v);
237
238}
239
240static void proc_key_users_stop(struct seq_file *p, void *v)
241{
242 spin_unlock(&key_user_lock);
243}
244
245static int proc_key_users_show(struct seq_file *m, void *v)
246{
247 struct rb_node *_p = v;
248 struct key_user *user = rb_entry(_p, struct key_user, node);
249
250 seq_printf(m, "%5u: %5d %d/%d %d/%d %d/%d\n",
251 user->uid,
252 atomic_read(&user->usage),
253 atomic_read(&user->nkeys),
254 atomic_read(&user->nikeys),
255 user->qnkeys,
256 KEYQUOTA_MAX_KEYS,
257 user->qnbytes,
258 KEYQUOTA_MAX_BYTES
259 );
260
261 return 0;
262
263}