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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> | |
1da177e4 LT |
15 | #include <linux/fs.h> |
16 | #include <linux/proc_fs.h> | |
17 | #include <linux/seq_file.h> | |
18 | #include <asm/errno.h> | |
19 | #include "internal.h" | |
20 | ||
21 | #ifdef CONFIG_KEYS_DEBUG_PROC_KEYS | |
22 | static int proc_keys_open(struct inode *inode, struct file *file); | |
23 | static void *proc_keys_start(struct seq_file *p, loff_t *_pos); | |
24 | static void *proc_keys_next(struct seq_file *p, void *v, loff_t *_pos); | |
25 | static void proc_keys_stop(struct seq_file *p, void *v); | |
26 | static int proc_keys_show(struct seq_file *m, void *v); | |
27 | ||
1996a109 | 28 | static const struct seq_operations proc_keys_ops = { |
1da177e4 LT |
29 | .start = proc_keys_start, |
30 | .next = proc_keys_next, | |
31 | .stop = proc_keys_stop, | |
32 | .show = proc_keys_show, | |
33 | }; | |
34 | ||
9c2e08c5 | 35 | static const struct file_operations proc_keys_fops = { |
1da177e4 LT |
36 | .open = proc_keys_open, |
37 | .read = seq_read, | |
38 | .llseek = seq_lseek, | |
39 | .release = seq_release, | |
40 | }; | |
41 | #endif | |
42 | ||
43 | static int proc_key_users_open(struct inode *inode, struct file *file); | |
44 | static void *proc_key_users_start(struct seq_file *p, loff_t *_pos); | |
45 | static void *proc_key_users_next(struct seq_file *p, void *v, loff_t *_pos); | |
46 | static void proc_key_users_stop(struct seq_file *p, void *v); | |
47 | static int proc_key_users_show(struct seq_file *m, void *v); | |
48 | ||
1996a109 | 49 | static const struct seq_operations proc_key_users_ops = { |
1da177e4 LT |
50 | .start = proc_key_users_start, |
51 | .next = proc_key_users_next, | |
52 | .stop = proc_key_users_stop, | |
53 | .show = proc_key_users_show, | |
54 | }; | |
55 | ||
9c2e08c5 | 56 | static const struct file_operations proc_key_users_fops = { |
1da177e4 LT |
57 | .open = proc_key_users_open, |
58 | .read = seq_read, | |
59 | .llseek = seq_lseek, | |
60 | .release = seq_release, | |
61 | }; | |
62 | ||
1da177e4 LT |
63 | /* |
64 | * declare the /proc files | |
65 | */ | |
66 | static int __init key_proc_init(void) | |
67 | { | |
68 | struct proc_dir_entry *p; | |
69 | ||
70 | #ifdef CONFIG_KEYS_DEBUG_PROC_KEYS | |
da91d2ef | 71 | p = proc_create("keys", 0, NULL, &proc_keys_fops); |
1da177e4 LT |
72 | if (!p) |
73 | panic("Cannot create /proc/keys\n"); | |
1da177e4 LT |
74 | #endif |
75 | ||
da91d2ef | 76 | p = proc_create("key-users", 0, NULL, &proc_key_users_fops); |
1da177e4 LT |
77 | if (!p) |
78 | panic("Cannot create /proc/key-users\n"); | |
79 | ||
1da177e4 | 80 | return 0; |
a8b17ed0 | 81 | } |
1da177e4 LT |
82 | |
83 | __initcall(key_proc_init); | |
84 | ||
1da177e4 LT |
85 | /* |
86 | * implement "/proc/keys" to provides a list of the keys on the system | |
87 | */ | |
88 | #ifdef CONFIG_KEYS_DEBUG_PROC_KEYS | |
89 | ||
ad73a717 | 90 | static struct rb_node *key_serial_next(struct rb_node *n) |
454804ab | 91 | { |
ad73a717 SH |
92 | struct user_namespace *user_ns = current_user_ns(); |
93 | ||
94 | n = rb_next(n); | |
454804ab SH |
95 | while (n) { |
96 | struct key *key = rb_entry(n, struct key, serial_node); | |
ad73a717 | 97 | if (key->user->user_ns == user_ns) |
454804ab SH |
98 | break; |
99 | n = rb_next(n); | |
100 | } | |
101 | return n; | |
102 | } | |
103 | ||
ad73a717 | 104 | static int proc_keys_open(struct inode *inode, struct file *file) |
454804ab | 105 | { |
ad73a717 | 106 | return seq_open(file, &proc_keys_ops); |
454804ab SH |
107 | } |
108 | ||
ad73a717 | 109 | static struct key *find_ge_key(key_serial_t id) |
454804ab | 110 | { |
ad73a717 SH |
111 | struct user_namespace *user_ns = current_user_ns(); |
112 | struct rb_node *n = key_serial_tree.rb_node; | |
113 | struct key *minkey = NULL; | |
454804ab | 114 | |
ad73a717 SH |
115 | while (n) { |
116 | struct key *key = rb_entry(n, struct key, serial_node); | |
117 | if (id < key->serial) { | |
118 | if (!minkey || minkey->serial > key->serial) | |
119 | minkey = key; | |
120 | n = n->rb_left; | |
121 | } else if (id > key->serial) { | |
122 | n = n->rb_right; | |
123 | } else { | |
124 | minkey = key; | |
125 | break; | |
126 | } | |
127 | key = NULL; | |
128 | } | |
1da177e4 | 129 | |
ad73a717 SH |
130 | if (!minkey) |
131 | return NULL; | |
132 | ||
133 | for (;;) { | |
134 | if (minkey->user->user_ns == user_ns) | |
135 | return minkey; | |
136 | n = rb_next(&minkey->serial_node); | |
137 | if (!n) | |
138 | return NULL; | |
139 | minkey = rb_entry(n, struct key, serial_node); | |
140 | } | |
1da177e4 LT |
141 | } |
142 | ||
143 | static void *proc_keys_start(struct seq_file *p, loff_t *_pos) | |
86abcf9c | 144 | __acquires(key_serial_lock) |
1da177e4 | 145 | { |
ad73a717 SH |
146 | key_serial_t pos = *_pos; |
147 | struct key *key; | |
1da177e4 LT |
148 | |
149 | spin_lock(&key_serial_lock); | |
150 | ||
ad73a717 SH |
151 | if (*_pos > INT_MAX) |
152 | return NULL; | |
153 | key = find_ge_key(pos); | |
154 | if (!key) | |
155 | return NULL; | |
156 | *_pos = key->serial; | |
157 | return &key->serial_node; | |
158 | } | |
1da177e4 | 159 | |
ad73a717 SH |
160 | static inline key_serial_t key_node_serial(struct rb_node *n) |
161 | { | |
162 | struct key *key = rb_entry(n, struct key, serial_node); | |
163 | return key->serial; | |
1da177e4 LT |
164 | } |
165 | ||
166 | static void *proc_keys_next(struct seq_file *p, void *v, loff_t *_pos) | |
167 | { | |
ad73a717 | 168 | struct rb_node *n; |
1da177e4 | 169 | |
ad73a717 SH |
170 | n = key_serial_next(v); |
171 | if (n) | |
172 | *_pos = key_node_serial(n); | |
173 | return n; | |
1da177e4 LT |
174 | } |
175 | ||
176 | static void proc_keys_stop(struct seq_file *p, void *v) | |
86abcf9c | 177 | __releases(key_serial_lock) |
1da177e4 LT |
178 | { |
179 | spin_unlock(&key_serial_lock); | |
180 | } | |
181 | ||
182 | static int proc_keys_show(struct seq_file *m, void *v) | |
183 | { | |
927942aa | 184 | const struct cred *cred = current_cred(); |
1da177e4 LT |
185 | struct rb_node *_p = v; |
186 | struct key *key = rb_entry(_p, struct key, serial_node); | |
187 | struct timespec now; | |
188 | unsigned long timo; | |
927942aa | 189 | key_ref_t key_ref, skey_ref; |
1da177e4 | 190 | char xbuf[12]; |
06ec7be5 ML |
191 | int rc; |
192 | ||
927942aa DH |
193 | key_ref = make_key_ref(key, 0); |
194 | ||
195 | /* determine if the key is possessed by this process (a test we can | |
196 | * skip if the key does not indicate the possessor can view it | |
197 | */ | |
198 | if (key->perm & KEY_POS_VIEW) { | |
199 | skey_ref = search_my_process_keyrings(key->type, key, | |
200 | lookup_user_key_possessed, | |
201 | cred); | |
202 | if (!IS_ERR(skey_ref)) { | |
203 | key_ref_put(skey_ref); | |
204 | key_ref = make_key_ref(key, 1); | |
205 | } | |
206 | } | |
207 | ||
06ec7be5 | 208 | /* check whether the current task is allowed to view the key (assuming |
d84f4f99 DH |
209 | * non-possession) |
210 | * - the caller holds a spinlock, and thus the RCU read lock, making our | |
211 | * access to __current_cred() safe | |
212 | */ | |
927942aa | 213 | rc = key_task_permission(key_ref, cred, KEY_VIEW); |
06ec7be5 ML |
214 | if (rc < 0) |
215 | return 0; | |
1da177e4 LT |
216 | |
217 | now = current_kernel_time(); | |
218 | ||
76d8aeab | 219 | rcu_read_lock(); |
1da177e4 LT |
220 | |
221 | /* come up with a suitable timeout value */ | |
222 | if (key->expiry == 0) { | |
223 | memcpy(xbuf, "perm", 5); | |
7b1b9164 | 224 | } else if (now.tv_sec >= key->expiry) { |
1da177e4 | 225 | memcpy(xbuf, "expd", 5); |
7b1b9164 | 226 | } else { |
1da177e4 LT |
227 | timo = key->expiry - now.tv_sec; |
228 | ||
229 | if (timo < 60) | |
230 | sprintf(xbuf, "%lus", timo); | |
231 | else if (timo < 60*60) | |
232 | sprintf(xbuf, "%lum", timo / 60); | |
233 | else if (timo < 60*60*24) | |
234 | sprintf(xbuf, "%luh", timo / (60*60)); | |
235 | else if (timo < 60*60*24*7) | |
236 | sprintf(xbuf, "%lud", timo / (60*60*24)); | |
237 | else | |
238 | sprintf(xbuf, "%luw", timo / (60*60*24*7)); | |
239 | } | |
240 | ||
76d8aeab DH |
241 | #define showflag(KEY, LETTER, FLAG) \ |
242 | (test_bit(FLAG, &(KEY)->flags) ? LETTER : '-') | |
243 | ||
664cceb0 | 244 | seq_printf(m, "%08x %c%c%c%c%c%c %5d %4s %08x %5d %5d %-9.9s ", |
1da177e4 | 245 | key->serial, |
76d8aeab DH |
246 | showflag(key, 'I', KEY_FLAG_INSTANTIATED), |
247 | showflag(key, 'R', KEY_FLAG_REVOKED), | |
248 | showflag(key, 'D', KEY_FLAG_DEAD), | |
249 | showflag(key, 'Q', KEY_FLAG_IN_QUOTA), | |
250 | showflag(key, 'U', KEY_FLAG_USER_CONSTRUCT), | |
251 | showflag(key, 'N', KEY_FLAG_NEGATIVE), | |
1da177e4 LT |
252 | atomic_read(&key->usage), |
253 | xbuf, | |
254 | key->perm, | |
255 | key->uid, | |
256 | key->gid, | |
257 | key->type->name); | |
258 | ||
76d8aeab DH |
259 | #undef showflag |
260 | ||
1da177e4 LT |
261 | if (key->type->describe) |
262 | key->type->describe(key, m); | |
263 | seq_putc(m, '\n'); | |
264 | ||
76d8aeab | 265 | rcu_read_unlock(); |
1da177e4 | 266 | return 0; |
1da177e4 LT |
267 | } |
268 | ||
269 | #endif /* CONFIG_KEYS_DEBUG_PROC_KEYS */ | |
270 | ||
454804ab SH |
271 | static struct rb_node *__key_user_next(struct rb_node *n) |
272 | { | |
273 | while (n) { | |
274 | struct key_user *user = rb_entry(n, struct key_user, node); | |
275 | if (user->user_ns == current_user_ns()) | |
276 | break; | |
277 | n = rb_next(n); | |
278 | } | |
279 | return n; | |
280 | } | |
281 | ||
282 | static struct rb_node *key_user_next(struct rb_node *n) | |
283 | { | |
284 | return __key_user_next(rb_next(n)); | |
285 | } | |
286 | ||
287 | static struct rb_node *key_user_first(struct rb_root *r) | |
288 | { | |
289 | struct rb_node *n = rb_first(r); | |
290 | return __key_user_next(n); | |
291 | } | |
7b1b9164 | 292 | |
1da177e4 LT |
293 | /* |
294 | * implement "/proc/key-users" to provides a list of the key users | |
295 | */ | |
296 | static int proc_key_users_open(struct inode *inode, struct file *file) | |
297 | { | |
298 | return seq_open(file, &proc_key_users_ops); | |
1da177e4 LT |
299 | } |
300 | ||
301 | static void *proc_key_users_start(struct seq_file *p, loff_t *_pos) | |
86abcf9c | 302 | __acquires(key_user_lock) |
1da177e4 LT |
303 | { |
304 | struct rb_node *_p; | |
305 | loff_t pos = *_pos; | |
306 | ||
307 | spin_lock(&key_user_lock); | |
308 | ||
454804ab | 309 | _p = key_user_first(&key_user_tree); |
1da177e4 LT |
310 | while (pos > 0 && _p) { |
311 | pos--; | |
454804ab | 312 | _p = key_user_next(_p); |
1da177e4 LT |
313 | } |
314 | ||
315 | return _p; | |
1da177e4 LT |
316 | } |
317 | ||
318 | static void *proc_key_users_next(struct seq_file *p, void *v, loff_t *_pos) | |
319 | { | |
320 | (*_pos)++; | |
c5b60b5e | 321 | return key_user_next((struct rb_node *)v); |
1da177e4 LT |
322 | } |
323 | ||
324 | static void proc_key_users_stop(struct seq_file *p, void *v) | |
86abcf9c | 325 | __releases(key_user_lock) |
1da177e4 LT |
326 | { |
327 | spin_unlock(&key_user_lock); | |
328 | } | |
329 | ||
330 | static int proc_key_users_show(struct seq_file *m, void *v) | |
331 | { | |
332 | struct rb_node *_p = v; | |
333 | struct key_user *user = rb_entry(_p, struct key_user, node); | |
0b77f5bf DH |
334 | unsigned maxkeys = (user->uid == 0) ? |
335 | key_quota_root_maxkeys : key_quota_maxkeys; | |
336 | unsigned maxbytes = (user->uid == 0) ? | |
337 | key_quota_root_maxbytes : key_quota_maxbytes; | |
1da177e4 LT |
338 | |
339 | seq_printf(m, "%5u: %5d %d/%d %d/%d %d/%d\n", | |
340 | user->uid, | |
341 | atomic_read(&user->usage), | |
342 | atomic_read(&user->nkeys), | |
343 | atomic_read(&user->nikeys), | |
344 | user->qnkeys, | |
0b77f5bf | 345 | maxkeys, |
1da177e4 | 346 | user->qnbytes, |
0b77f5bf | 347 | maxbytes); |
1da177e4 LT |
348 | |
349 | return 0; | |
1da177e4 | 350 | } |