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1/* 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
36static struct file_operations proc_keys_fops = {
37 .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
57static struct file_operations proc_key_users_fops = {
58 .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];
140
141 now = current_kernel_time();
142
143 rcu_read_lock();
144
145 /* come up with a suitable timeout value */
146 if (key->expiry == 0) {
147 memcpy(xbuf, "perm", 5);
148 }
149 else if (now.tv_sec >= key->expiry) {
150 memcpy(xbuf, "expd", 5);
151 }
152 else {
153 timo = key->expiry - now.tv_sec;
154
155 if (timo < 60)
156 sprintf(xbuf, "%lus", timo);
157 else if (timo < 60*60)
158 sprintf(xbuf, "%lum", timo / 60);
159 else if (timo < 60*60*24)
160 sprintf(xbuf, "%luh", timo / (60*60));
161 else if (timo < 60*60*24*7)
162 sprintf(xbuf, "%lud", timo / (60*60*24));
163 else
164 sprintf(xbuf, "%luw", timo / (60*60*24*7));
165 }
166
167#define showflag(KEY, LETTER, FLAG) \
168 (test_bit(FLAG, &(KEY)->flags) ? LETTER : '-')
169
170 seq_printf(m, "%08x %c%c%c%c%c%c %5d %4s %06x %5d %5d %-9.9s ",
171 key->serial,
172 showflag(key, 'I', KEY_FLAG_INSTANTIATED),
173 showflag(key, 'R', KEY_FLAG_REVOKED),
174 showflag(key, 'D', KEY_FLAG_DEAD),
175 showflag(key, 'Q', KEY_FLAG_IN_QUOTA),
176 showflag(key, 'U', KEY_FLAG_USER_CONSTRUCT),
177 showflag(key, 'N', KEY_FLAG_NEGATIVE),
178 atomic_read(&key->usage),
179 xbuf,
180 key->perm,
181 key->uid,
182 key->gid,
183 key->type->name);
184
185#undef showflag
186
187 if (key->type->describe)
188 key->type->describe(key, m);
189 seq_putc(m, '\n');
190
191 rcu_read_unlock();
192
193 return 0;
194
195}
196
197#endif /* CONFIG_KEYS_DEBUG_PROC_KEYS */
198
199/*****************************************************************************/
200/*
201 * implement "/proc/key-users" to provides a list of the key users
202 */
203static int proc_key_users_open(struct inode *inode, struct file *file)
204{
205 return seq_open(file, &proc_key_users_ops);
206
207}
208
209static void *proc_key_users_start(struct seq_file *p, loff_t *_pos)
210{
211 struct rb_node *_p;
212 loff_t pos = *_pos;
213
214 spin_lock(&key_user_lock);
215
216 _p = rb_first(&key_user_tree);
217 while (pos > 0 && _p) {
218 pos--;
219 _p = rb_next(_p);
220 }
221
222 return _p;
223
224}
225
226static void *proc_key_users_next(struct seq_file *p, void *v, loff_t *_pos)
227{
228 (*_pos)++;
229 return rb_next((struct rb_node *) v);
230
231}
232
233static void proc_key_users_stop(struct seq_file *p, void *v)
234{
235 spin_unlock(&key_user_lock);
236}
237
238static int proc_key_users_show(struct seq_file *m, void *v)
239{
240 struct rb_node *_p = v;
241 struct key_user *user = rb_entry(_p, struct key_user, node);
242
243 seq_printf(m, "%5u: %5d %d/%d %d/%d %d/%d\n",
244 user->uid,
245 atomic_read(&user->usage),
246 atomic_read(&user->nkeys),
247 atomic_read(&user->nikeys),
248 user->qnkeys,
249 KEYQUOTA_MAX_KEYS,
250 user->qnbytes,
251 KEYQUOTA_MAX_BYTES
252 );
253
254 return 0;
255
256}