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 int proc_keys_open(struct inode *inode, struct file *file)
96 return seq_open(file, &proc_keys_ops);
100 static void *proc_keys_start(struct seq_file *p, loff_t *_pos)
105 spin_lock(&key_serial_lock);
107 _p = rb_first(&key_serial_tree);
108 while (pos > 0 && _p) {
117 static void *proc_keys_next(struct seq_file *p, void *v, loff_t *_pos)
120 return rb_next((struct rb_node *) v);
124 static void proc_keys_stop(struct seq_file *p, void *v)
126 spin_unlock(&key_serial_lock);
129 static int proc_keys_show(struct seq_file *m, void *v)
131 struct rb_node *_p = v;
132 struct key *key = rb_entry(_p, struct key, serial_node);
138 /* check whether the current task is allowed to view the key (assuming
140 rc = key_task_permission(make_key_ref(key, 0), current, KEY_VIEW);
144 now = current_kernel_time();
148 /* come up with a suitable timeout value */
149 if (key->expiry == 0) {
150 memcpy(xbuf, "perm", 5);
152 else if (now.tv_sec >= key->expiry) {
153 memcpy(xbuf, "expd", 5);
156 timo = key->expiry - now.tv_sec;
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));
167 sprintf(xbuf, "%luw", timo / (60*60*24*7));
170 #define showflag(KEY, LETTER, FLAG) \
171 (test_bit(FLAG, &(KEY)->flags) ? LETTER : '-')
173 seq_printf(m, "%08x %c%c%c%c%c%c %5d %4s %08x %5d %5d %-9.9s ",
175 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),
181 atomic_read(&key->usage),
190 if (key->type->describe)
191 key->type->describe(key, m);
200 #endif /* CONFIG_KEYS_DEBUG_PROC_KEYS */
202 /*****************************************************************************/
204 * implement "/proc/key-users" to provides a list of the key users
206 static int proc_key_users_open(struct inode *inode, struct file *file)
208 return seq_open(file, &proc_key_users_ops);
212 static void *proc_key_users_start(struct seq_file *p, loff_t *_pos)
217 spin_lock(&key_user_lock);
219 _p = rb_first(&key_user_tree);
220 while (pos > 0 && _p) {
229 static void *proc_key_users_next(struct seq_file *p, void *v, loff_t *_pos)
232 return rb_next((struct rb_node *) v);
236 static void proc_key_users_stop(struct seq_file *p, void *v)
238 spin_unlock(&key_user_lock);
241 static int proc_key_users_show(struct seq_file *m, void *v)
243 struct rb_node *_p = v;
244 struct key_user *user = rb_entry(_p, struct key_user, node);
246 seq_printf(m, "%5u: %5d %d/%d %d/%d %d/%d\n",
248 atomic_read(&user->usage),
249 atomic_read(&user->nkeys),
250 atomic_read(&user->nikeys),