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1da177e4 LT |
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 | |
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); | |
28 | ||
1996a109 | 29 | static const struct seq_operations proc_keys_ops = { |
1da177e4 LT |
30 | .start = proc_keys_start, |
31 | .next = proc_keys_next, | |
32 | .stop = proc_keys_stop, | |
33 | .show = proc_keys_show, | |
34 | }; | |
35 | ||
9c2e08c5 | 36 | static const struct file_operations proc_keys_fops = { |
1da177e4 LT |
37 | .open = proc_keys_open, |
38 | .read = seq_read, | |
39 | .llseek = seq_lseek, | |
40 | .release = seq_release, | |
41 | }; | |
42 | #endif | |
43 | ||
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); | |
49 | ||
1996a109 | 50 | static const struct seq_operations proc_key_users_ops = { |
1da177e4 LT |
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 | ||
9c2e08c5 | 57 | static const struct file_operations proc_key_users_fops = { |
1da177e4 LT |
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 | */ | |
68 | static int __init key_proc_init(void) | |
69 | { | |
70 | struct proc_dir_entry *p; | |
71 | ||
72 | #ifdef CONFIG_KEYS_DEBUG_PROC_KEYS | |
da91d2ef | 73 | p = proc_create("keys", 0, NULL, &proc_keys_fops); |
1da177e4 LT |
74 | if (!p) |
75 | panic("Cannot create /proc/keys\n"); | |
1da177e4 LT |
76 | #endif |
77 | ||
da91d2ef | 78 | p = proc_create("key-users", 0, NULL, &proc_key_users_fops); |
1da177e4 LT |
79 | if (!p) |
80 | panic("Cannot create /proc/key-users\n"); | |
81 | ||
1da177e4 LT |
82 | 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 | ||
454804ab SH |
94 | static struct rb_node *__key_serial_next(struct rb_node *n) |
95 | { | |
96 | while (n) { | |
97 | struct key *key = rb_entry(n, struct key, serial_node); | |
98 | if (key->user->user_ns == current_user_ns()) | |
99 | break; | |
100 | n = rb_next(n); | |
101 | } | |
102 | return n; | |
103 | } | |
104 | ||
105 | static struct rb_node *key_serial_next(struct rb_node *n) | |
106 | { | |
107 | return __key_serial_next(rb_next(n)); | |
108 | } | |
109 | ||
110 | static struct rb_node *key_serial_first(struct rb_root *r) | |
111 | { | |
112 | struct rb_node *n = rb_first(r); | |
113 | return __key_serial_next(n); | |
114 | } | |
115 | ||
1da177e4 LT |
116 | static int proc_keys_open(struct inode *inode, struct file *file) |
117 | { | |
118 | return seq_open(file, &proc_keys_ops); | |
119 | ||
120 | } | |
121 | ||
122 | static void *proc_keys_start(struct seq_file *p, loff_t *_pos) | |
123 | { | |
124 | struct rb_node *_p; | |
125 | loff_t pos = *_pos; | |
126 | ||
127 | spin_lock(&key_serial_lock); | |
128 | ||
454804ab | 129 | _p = key_serial_first(&key_serial_tree); |
1da177e4 LT |
130 | while (pos > 0 && _p) { |
131 | pos--; | |
454804ab | 132 | _p = key_serial_next(_p); |
1da177e4 LT |
133 | } |
134 | ||
135 | return _p; | |
136 | ||
137 | } | |
138 | ||
139 | static void *proc_keys_next(struct seq_file *p, void *v, loff_t *_pos) | |
140 | { | |
141 | (*_pos)++; | |
454804ab | 142 | return key_serial_next((struct rb_node *) v); |
1da177e4 LT |
143 | |
144 | } | |
145 | ||
146 | static void proc_keys_stop(struct seq_file *p, void *v) | |
147 | { | |
148 | spin_unlock(&key_serial_lock); | |
149 | } | |
150 | ||
151 | static int proc_keys_show(struct seq_file *m, void *v) | |
152 | { | |
153 | struct rb_node *_p = v; | |
154 | struct key *key = rb_entry(_p, struct key, serial_node); | |
155 | struct timespec now; | |
156 | unsigned long timo; | |
157 | char xbuf[12]; | |
06ec7be5 ML |
158 | int rc; |
159 | ||
160 | /* check whether the current task is allowed to view the key (assuming | |
d84f4f99 DH |
161 | * non-possession) |
162 | * - the caller holds a spinlock, and thus the RCU read lock, making our | |
163 | * access to __current_cred() safe | |
164 | */ | |
165 | rc = key_task_permission(make_key_ref(key, 0), current_cred(), | |
166 | KEY_VIEW); | |
06ec7be5 ML |
167 | if (rc < 0) |
168 | return 0; | |
1da177e4 LT |
169 | |
170 | now = current_kernel_time(); | |
171 | ||
76d8aeab | 172 | rcu_read_lock(); |
1da177e4 LT |
173 | |
174 | /* come up with a suitable timeout value */ | |
175 | if (key->expiry == 0) { | |
176 | memcpy(xbuf, "perm", 5); | |
177 | } | |
178 | else if (now.tv_sec >= key->expiry) { | |
179 | memcpy(xbuf, "expd", 5); | |
180 | } | |
181 | else { | |
182 | timo = key->expiry - now.tv_sec; | |
183 | ||
184 | if (timo < 60) | |
185 | sprintf(xbuf, "%lus", timo); | |
186 | else if (timo < 60*60) | |
187 | sprintf(xbuf, "%lum", timo / 60); | |
188 | else if (timo < 60*60*24) | |
189 | sprintf(xbuf, "%luh", timo / (60*60)); | |
190 | else if (timo < 60*60*24*7) | |
191 | sprintf(xbuf, "%lud", timo / (60*60*24)); | |
192 | else | |
193 | sprintf(xbuf, "%luw", timo / (60*60*24*7)); | |
194 | } | |
195 | ||
76d8aeab DH |
196 | #define showflag(KEY, LETTER, FLAG) \ |
197 | (test_bit(FLAG, &(KEY)->flags) ? LETTER : '-') | |
198 | ||
664cceb0 | 199 | seq_printf(m, "%08x %c%c%c%c%c%c %5d %4s %08x %5d %5d %-9.9s ", |
1da177e4 | 200 | key->serial, |
76d8aeab DH |
201 | showflag(key, 'I', KEY_FLAG_INSTANTIATED), |
202 | showflag(key, 'R', KEY_FLAG_REVOKED), | |
203 | showflag(key, 'D', KEY_FLAG_DEAD), | |
204 | showflag(key, 'Q', KEY_FLAG_IN_QUOTA), | |
205 | showflag(key, 'U', KEY_FLAG_USER_CONSTRUCT), | |
206 | showflag(key, 'N', KEY_FLAG_NEGATIVE), | |
1da177e4 LT |
207 | atomic_read(&key->usage), |
208 | xbuf, | |
209 | key->perm, | |
210 | key->uid, | |
211 | key->gid, | |
212 | key->type->name); | |
213 | ||
76d8aeab DH |
214 | #undef showflag |
215 | ||
1da177e4 LT |
216 | if (key->type->describe) |
217 | key->type->describe(key, m); | |
218 | seq_putc(m, '\n'); | |
219 | ||
76d8aeab | 220 | rcu_read_unlock(); |
1da177e4 LT |
221 | |
222 | return 0; | |
223 | ||
224 | } | |
225 | ||
226 | #endif /* CONFIG_KEYS_DEBUG_PROC_KEYS */ | |
227 | ||
454804ab SH |
228 | static struct rb_node *__key_user_next(struct rb_node *n) |
229 | { | |
230 | while (n) { | |
231 | struct key_user *user = rb_entry(n, struct key_user, node); | |
232 | if (user->user_ns == current_user_ns()) | |
233 | break; | |
234 | n = rb_next(n); | |
235 | } | |
236 | return n; | |
237 | } | |
238 | ||
239 | static struct rb_node *key_user_next(struct rb_node *n) | |
240 | { | |
241 | return __key_user_next(rb_next(n)); | |
242 | } | |
243 | ||
244 | static struct rb_node *key_user_first(struct rb_root *r) | |
245 | { | |
246 | struct rb_node *n = rb_first(r); | |
247 | return __key_user_next(n); | |
248 | } | |
1da177e4 LT |
249 | /*****************************************************************************/ |
250 | /* | |
251 | * implement "/proc/key-users" to provides a list of the key users | |
252 | */ | |
253 | static int proc_key_users_open(struct inode *inode, struct file *file) | |
254 | { | |
255 | return seq_open(file, &proc_key_users_ops); | |
256 | ||
257 | } | |
258 | ||
259 | static void *proc_key_users_start(struct seq_file *p, loff_t *_pos) | |
260 | { | |
261 | struct rb_node *_p; | |
262 | loff_t pos = *_pos; | |
263 | ||
264 | spin_lock(&key_user_lock); | |
265 | ||
454804ab | 266 | _p = key_user_first(&key_user_tree); |
1da177e4 LT |
267 | while (pos > 0 && _p) { |
268 | pos--; | |
454804ab | 269 | _p = key_user_next(_p); |
1da177e4 LT |
270 | } |
271 | ||
272 | return _p; | |
273 | ||
274 | } | |
275 | ||
276 | static void *proc_key_users_next(struct seq_file *p, void *v, loff_t *_pos) | |
277 | { | |
278 | (*_pos)++; | |
454804ab | 279 | return key_user_next((struct rb_node *) v); |
1da177e4 LT |
280 | |
281 | } | |
282 | ||
283 | static void proc_key_users_stop(struct seq_file *p, void *v) | |
284 | { | |
285 | spin_unlock(&key_user_lock); | |
286 | } | |
287 | ||
288 | static int proc_key_users_show(struct seq_file *m, void *v) | |
289 | { | |
290 | struct rb_node *_p = v; | |
291 | struct key_user *user = rb_entry(_p, struct key_user, node); | |
0b77f5bf DH |
292 | unsigned maxkeys = (user->uid == 0) ? |
293 | key_quota_root_maxkeys : key_quota_maxkeys; | |
294 | unsigned maxbytes = (user->uid == 0) ? | |
295 | key_quota_root_maxbytes : key_quota_maxbytes; | |
1da177e4 LT |
296 | |
297 | seq_printf(m, "%5u: %5d %d/%d %d/%d %d/%d\n", | |
298 | user->uid, | |
299 | atomic_read(&user->usage), | |
300 | atomic_read(&user->nkeys), | |
301 | atomic_read(&user->nikeys), | |
302 | user->qnkeys, | |
0b77f5bf | 303 | maxkeys, |
1da177e4 | 304 | user->qnbytes, |
0b77f5bf | 305 | maxbytes); |
1da177e4 LT |
306 | |
307 | return 0; | |
308 | ||
309 | } |