1 /* proc.c: proc files for key database enumeration
3 * Copyright (C) 2004 Red Hat, Inc. All Rights Reserved.
4 * Written by David Howells (dhowells@redhat.com)
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.
12 #include <linux/module.h>
13 #include <linux/init.h>
14 #include <linux/sched.h>
15 #include <linux/slab.h>
17 #include <linux/proc_fs.h>
18 #include <linux/seq_file.h>
19 #include <asm/errno.h>
22 #ifdef CONFIG_KEYS_DEBUG_PROC_KEYS
23 static int proc_keys_open(struct inode *inode, struct file *file);
24 static void *proc_keys_start(struct seq_file *p, loff_t *_pos);
25 static void *proc_keys_next(struct seq_file *p, void *v, loff_t *_pos);
26 static void proc_keys_stop(struct seq_file *p, void *v);
27 static int proc_keys_show(struct seq_file *m, void *v);
29 static const 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,
36 static const struct file_operations proc_keys_fops = {
37 .open = proc_keys_open,
40 .release = seq_release,
44 static int proc_key_users_open(struct inode *inode, struct file *file);
45 static void *proc_key_users_start(struct seq_file *p, loff_t *_pos);
46 static void *proc_key_users_next(struct seq_file *p, void *v, loff_t *_pos);
47 static void proc_key_users_stop(struct seq_file *p, void *v);
48 static int proc_key_users_show(struct seq_file *m, void *v);
50 static const 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,
57 static const struct file_operations proc_key_users_fops = {
58 .open = proc_key_users_open,
61 .release = seq_release,
64 /*****************************************************************************/
66 * declare the /proc files
68 static int __init key_proc_init(void)
70 struct proc_dir_entry *p;
72 #ifdef CONFIG_KEYS_DEBUG_PROC_KEYS
73 p = proc_create("keys", 0, NULL, &proc_keys_fops);
75 panic("Cannot create /proc/keys\n");
78 p = proc_create("key-users", 0, NULL, &proc_key_users_fops);
80 panic("Cannot create /proc/key-users\n");
84 } /* end key_proc_init() */
86 __initcall(key_proc_init);
88 /*****************************************************************************/
90 * implement "/proc/keys" to provides a list of the keys on the system
92 #ifdef CONFIG_KEYS_DEBUG_PROC_KEYS
94 static struct rb_node *__key_serial_next(struct rb_node *n)
97 struct key *key = rb_entry(n, struct key, serial_node);
98 if (key->user->user_ns == current_user_ns())
105 static struct rb_node *key_serial_next(struct rb_node *n)
107 return __key_serial_next(rb_next(n));
110 static struct rb_node *key_serial_first(struct rb_root *r)
112 struct rb_node *n = rb_first(r);
113 return __key_serial_next(n);
116 static int proc_keys_open(struct inode *inode, struct file *file)
118 return seq_open(file, &proc_keys_ops);
122 static void *proc_keys_start(struct seq_file *p, loff_t *_pos)
123 __acquires(key_serial_lock)
128 spin_lock(&key_serial_lock);
130 _p = key_serial_first(&key_serial_tree);
131 while (pos > 0 && _p) {
133 _p = key_serial_next(_p);
140 static void *proc_keys_next(struct seq_file *p, void *v, loff_t *_pos)
143 return key_serial_next((struct rb_node *) v);
147 static void proc_keys_stop(struct seq_file *p, void *v)
148 __releases(key_serial_lock)
150 spin_unlock(&key_serial_lock);
153 static int proc_keys_show(struct seq_file *m, void *v)
155 struct rb_node *_p = v;
156 struct key *key = rb_entry(_p, struct key, serial_node);
162 /* check whether the current task is allowed to view the key (assuming
164 * - the caller holds a spinlock, and thus the RCU read lock, making our
165 * access to __current_cred() safe
167 rc = key_task_permission(make_key_ref(key, 0), current_cred(),
172 now = current_kernel_time();
176 /* come up with a suitable timeout value */
177 if (key->expiry == 0) {
178 memcpy(xbuf, "perm", 5);
180 else if (now.tv_sec >= key->expiry) {
181 memcpy(xbuf, "expd", 5);
184 timo = key->expiry - now.tv_sec;
187 sprintf(xbuf, "%lus", timo);
188 else if (timo < 60*60)
189 sprintf(xbuf, "%lum", timo / 60);
190 else if (timo < 60*60*24)
191 sprintf(xbuf, "%luh", timo / (60*60));
192 else if (timo < 60*60*24*7)
193 sprintf(xbuf, "%lud", timo / (60*60*24));
195 sprintf(xbuf, "%luw", timo / (60*60*24*7));
198 #define showflag(KEY, LETTER, FLAG) \
199 (test_bit(FLAG, &(KEY)->flags) ? LETTER : '-')
201 seq_printf(m, "%08x %c%c%c%c%c%c %5d %4s %08x %5d %5d %-9.9s ",
203 showflag(key, 'I', KEY_FLAG_INSTANTIATED),
204 showflag(key, 'R', KEY_FLAG_REVOKED),
205 showflag(key, 'D', KEY_FLAG_DEAD),
206 showflag(key, 'Q', KEY_FLAG_IN_QUOTA),
207 showflag(key, 'U', KEY_FLAG_USER_CONSTRUCT),
208 showflag(key, 'N', KEY_FLAG_NEGATIVE),
209 atomic_read(&key->usage),
218 if (key->type->describe)
219 key->type->describe(key, m);
228 #endif /* CONFIG_KEYS_DEBUG_PROC_KEYS */
230 static struct rb_node *__key_user_next(struct rb_node *n)
233 struct key_user *user = rb_entry(n, struct key_user, node);
234 if (user->user_ns == current_user_ns())
241 static struct rb_node *key_user_next(struct rb_node *n)
243 return __key_user_next(rb_next(n));
246 static struct rb_node *key_user_first(struct rb_root *r)
248 struct rb_node *n = rb_first(r);
249 return __key_user_next(n);
251 /*****************************************************************************/
253 * implement "/proc/key-users" to provides a list of the key users
255 static int proc_key_users_open(struct inode *inode, struct file *file)
257 return seq_open(file, &proc_key_users_ops);
261 static void *proc_key_users_start(struct seq_file *p, loff_t *_pos)
262 __acquires(key_user_lock)
267 spin_lock(&key_user_lock);
269 _p = key_user_first(&key_user_tree);
270 while (pos > 0 && _p) {
272 _p = key_user_next(_p);
279 static void *proc_key_users_next(struct seq_file *p, void *v, loff_t *_pos)
282 return key_user_next((struct rb_node *) v);
286 static void proc_key_users_stop(struct seq_file *p, void *v)
287 __releases(key_user_lock)
289 spin_unlock(&key_user_lock);
292 static int proc_key_users_show(struct seq_file *m, void *v)
294 struct rb_node *_p = v;
295 struct key_user *user = rb_entry(_p, struct key_user, node);
296 unsigned maxkeys = (user->uid == 0) ?
297 key_quota_root_maxkeys : key_quota_maxkeys;
298 unsigned maxbytes = (user->uid == 0) ?
299 key_quota_root_maxbytes : key_quota_maxbytes;
301 seq_printf(m, "%5u: %5d %d/%d %d/%d %d/%d\n",
303 atomic_read(&user->usage),
304 atomic_read(&user->nkeys),
305 atomic_read(&user->nikeys),