blob: f619170da760688f4d40c856ab2adb1a999fff26 [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
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
94static int proc_keys_open(struct inode *inode, struct file *file)
95{
96 return seq_open(file, &proc_keys_ops);
97
98}
99
100static void *proc_keys_start(struct seq_file *p, loff_t *_pos)
101{
102 struct rb_node *_p;
103 loff_t pos = *_pos;
104
105 spin_lock(&key_serial_lock);
106
107 _p = rb_first(&key_serial_tree);
108 while (pos > 0 && _p) {
109 pos--;
110 _p = rb_next(_p);
111 }
112
113 return _p;
114
115}
116
117static void *proc_keys_next(struct seq_file *p, void *v, loff_t *_pos)
118{
119 (*_pos)++;
120 return rb_next((struct rb_node *) v);
121
122}
123
124static void proc_keys_stop(struct seq_file *p, void *v)
125{
126 spin_unlock(&key_serial_lock);
127}
128
129static int proc_keys_show(struct seq_file *m, void *v)
130{
131 struct rb_node *_p = v;
132 struct key *key = rb_entry(_p, struct key, serial_node);
133 struct timespec now;
134 unsigned long timo;
135 char xbuf[12];
Michael LeMay06ec7be2006-06-26 00:24:56 -0700136 int rc;
137
138 /* check whether the current task is allowed to view the key (assuming
139 * non-possession) */
140 rc = key_task_permission(make_key_ref(key, 0), current, KEY_VIEW);
141 if (rc < 0)
142 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700143
144 now = current_kernel_time();
145
David Howells76d8aea2005-06-23 22:00:49 -0700146 rcu_read_lock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700147
148 /* come up with a suitable timeout value */
149 if (key->expiry == 0) {
150 memcpy(xbuf, "perm", 5);
151 }
152 else if (now.tv_sec >= key->expiry) {
153 memcpy(xbuf, "expd", 5);
154 }
155 else {
156 timo = key->expiry - now.tv_sec;
157
158 if (timo < 60)
159 sprintf(xbuf, "%lus", timo);
160 else if (timo < 60*60)
161 sprintf(xbuf, "%lum", timo / 60);
162 else if (timo < 60*60*24)
163 sprintf(xbuf, "%luh", timo / (60*60));
164 else if (timo < 60*60*24*7)
165 sprintf(xbuf, "%lud", timo / (60*60*24));
166 else
167 sprintf(xbuf, "%luw", timo / (60*60*24*7));
168 }
169
David Howells76d8aea2005-06-23 22:00:49 -0700170#define showflag(KEY, LETTER, FLAG) \
171 (test_bit(FLAG, &(KEY)->flags) ? LETTER : '-')
172
David Howells664cceb2005-09-28 17:03:15 +0100173 seq_printf(m, "%08x %c%c%c%c%c%c %5d %4s %08x %5d %5d %-9.9s ",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700174 key->serial,
David Howells76d8aea2005-06-23 22:00:49 -0700175 showflag(key, 'I', KEY_FLAG_INSTANTIATED),
176 showflag(key, 'R', KEY_FLAG_REVOKED),
177 showflag(key, 'D', KEY_FLAG_DEAD),
178 showflag(key, 'Q', KEY_FLAG_IN_QUOTA),
179 showflag(key, 'U', KEY_FLAG_USER_CONSTRUCT),
180 showflag(key, 'N', KEY_FLAG_NEGATIVE),
Linus Torvalds1da177e2005-04-16 15:20:36 -0700181 atomic_read(&key->usage),
182 xbuf,
183 key->perm,
184 key->uid,
185 key->gid,
186 key->type->name);
187
David Howells76d8aea2005-06-23 22:00:49 -0700188#undef showflag
189
Linus Torvalds1da177e2005-04-16 15:20:36 -0700190 if (key->type->describe)
191 key->type->describe(key, m);
192 seq_putc(m, '\n');
193
David Howells76d8aea2005-06-23 22:00:49 -0700194 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700195
196 return 0;
197
198}
199
200#endif /* CONFIG_KEYS_DEBUG_PROC_KEYS */
201
202/*****************************************************************************/
203/*
204 * implement "/proc/key-users" to provides a list of the key users
205 */
206static int proc_key_users_open(struct inode *inode, struct file *file)
207{
208 return seq_open(file, &proc_key_users_ops);
209
210}
211
212static void *proc_key_users_start(struct seq_file *p, loff_t *_pos)
213{
214 struct rb_node *_p;
215 loff_t pos = *_pos;
216
217 spin_lock(&key_user_lock);
218
219 _p = rb_first(&key_user_tree);
220 while (pos > 0 && _p) {
221 pos--;
222 _p = rb_next(_p);
223 }
224
225 return _p;
226
227}
228
229static void *proc_key_users_next(struct seq_file *p, void *v, loff_t *_pos)
230{
231 (*_pos)++;
232 return rb_next((struct rb_node *) v);
233
234}
235
236static void proc_key_users_stop(struct seq_file *p, void *v)
237{
238 spin_unlock(&key_user_lock);
239}
240
241static int proc_key_users_show(struct seq_file *m, void *v)
242{
243 struct rb_node *_p = v;
244 struct key_user *user = rb_entry(_p, struct key_user, node);
David Howells0b77f5b2008-04-29 01:01:32 -0700245 unsigned maxkeys = (user->uid == 0) ?
246 key_quota_root_maxkeys : key_quota_maxkeys;
247 unsigned maxbytes = (user->uid == 0) ?
248 key_quota_root_maxbytes : key_quota_maxbytes;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700249
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,
David Howells0b77f5b2008-04-29 01:01:32 -0700256 maxkeys,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700257 user->qnbytes,
David Howells0b77f5b2008-04-29 01:01:32 -0700258 maxbytes);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700259
260 return 0;
261
262}