Commit | Line | Data |
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973c9f4f | 1 | /* procfs files for key database enumeration |
1da177e4 LT |
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 | 63 | /* |
973c9f4f | 64 | * Declare the /proc files. |
1da177e4 LT |
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 | 85 | /* |
973c9f4f DH |
86 | * Implement "/proc/keys" to provide a list of the keys on the system that |
87 | * grant View permission to the caller. | |
1da177e4 LT |
88 | */ |
89 | #ifdef CONFIG_KEYS_DEBUG_PROC_KEYS | |
90 | ||
9a56c2db | 91 | static struct rb_node *key_serial_next(struct seq_file *p, struct rb_node *n) |
454804ab | 92 | { |
9a56c2db | 93 | struct user_namespace *user_ns = seq_user_ns(p); |
ad73a717 SH |
94 | |
95 | n = rb_next(n); | |
454804ab SH |
96 | while (n) { |
97 | struct key *key = rb_entry(n, struct key, serial_node); | |
9a56c2db | 98 | if (kuid_has_mapping(user_ns, key->user->uid)) |
454804ab SH |
99 | break; |
100 | n = rb_next(n); | |
101 | } | |
102 | return n; | |
103 | } | |
104 | ||
ad73a717 | 105 | static int proc_keys_open(struct inode *inode, struct file *file) |
454804ab | 106 | { |
ad73a717 | 107 | return seq_open(file, &proc_keys_ops); |
454804ab SH |
108 | } |
109 | ||
9a56c2db | 110 | static struct key *find_ge_key(struct seq_file *p, key_serial_t id) |
454804ab | 111 | { |
9a56c2db | 112 | struct user_namespace *user_ns = seq_user_ns(p); |
ad73a717 SH |
113 | struct rb_node *n = key_serial_tree.rb_node; |
114 | struct key *minkey = NULL; | |
454804ab | 115 | |
ad73a717 SH |
116 | while (n) { |
117 | struct key *key = rb_entry(n, struct key, serial_node); | |
118 | if (id < key->serial) { | |
119 | if (!minkey || minkey->serial > key->serial) | |
120 | minkey = key; | |
121 | n = n->rb_left; | |
122 | } else if (id > key->serial) { | |
123 | n = n->rb_right; | |
124 | } else { | |
125 | minkey = key; | |
126 | break; | |
127 | } | |
128 | key = NULL; | |
129 | } | |
1da177e4 | 130 | |
ad73a717 SH |
131 | if (!minkey) |
132 | return NULL; | |
133 | ||
134 | for (;;) { | |
9a56c2db | 135 | if (kuid_has_mapping(user_ns, minkey->user->uid)) |
ad73a717 SH |
136 | return minkey; |
137 | n = rb_next(&minkey->serial_node); | |
138 | if (!n) | |
139 | return NULL; | |
140 | minkey = rb_entry(n, struct key, serial_node); | |
141 | } | |
1da177e4 LT |
142 | } |
143 | ||
144 | static void *proc_keys_start(struct seq_file *p, loff_t *_pos) | |
86abcf9c | 145 | __acquires(key_serial_lock) |
1da177e4 | 146 | { |
ad73a717 SH |
147 | key_serial_t pos = *_pos; |
148 | struct key *key; | |
1da177e4 LT |
149 | |
150 | spin_lock(&key_serial_lock); | |
151 | ||
ad73a717 SH |
152 | if (*_pos > INT_MAX) |
153 | return NULL; | |
9a56c2db | 154 | key = find_ge_key(p, pos); |
ad73a717 SH |
155 | if (!key) |
156 | return NULL; | |
157 | *_pos = key->serial; | |
158 | return &key->serial_node; | |
159 | } | |
1da177e4 | 160 | |
ad73a717 SH |
161 | static inline key_serial_t key_node_serial(struct rb_node *n) |
162 | { | |
163 | struct key *key = rb_entry(n, struct key, serial_node); | |
164 | return key->serial; | |
1da177e4 LT |
165 | } |
166 | ||
167 | static void *proc_keys_next(struct seq_file *p, void *v, loff_t *_pos) | |
168 | { | |
ad73a717 | 169 | struct rb_node *n; |
1da177e4 | 170 | |
9a56c2db | 171 | n = key_serial_next(p, v); |
ad73a717 SH |
172 | if (n) |
173 | *_pos = key_node_serial(n); | |
174 | return n; | |
1da177e4 LT |
175 | } |
176 | ||
177 | static void proc_keys_stop(struct seq_file *p, void *v) | |
86abcf9c | 178 | __releases(key_serial_lock) |
1da177e4 LT |
179 | { |
180 | spin_unlock(&key_serial_lock); | |
181 | } | |
182 | ||
183 | static int proc_keys_show(struct seq_file *m, void *v) | |
184 | { | |
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 | ||
4bdf0bc3 DH |
193 | struct keyring_search_context ctx = { |
194 | .index_key.type = key->type, | |
195 | .index_key.description = key->description, | |
196 | .cred = current_cred(), | |
46291959 DH |
197 | .match_data.cmp = lookup_user_key_possessed, |
198 | .match_data.raw_data = key, | |
199 | .match_data.lookup_type = KEYRING_SEARCH_LOOKUP_DIRECT, | |
200 | .flags = KEYRING_SEARCH_NO_STATE_CHECK, | |
4bdf0bc3 DH |
201 | }; |
202 | ||
927942aa DH |
203 | key_ref = make_key_ref(key, 0); |
204 | ||
205 | /* determine if the key is possessed by this process (a test we can | |
206 | * skip if the key does not indicate the possessor can view it | |
207 | */ | |
208 | if (key->perm & KEY_POS_VIEW) { | |
4bdf0bc3 | 209 | skey_ref = search_my_process_keyrings(&ctx); |
927942aa DH |
210 | if (!IS_ERR(skey_ref)) { |
211 | key_ref_put(skey_ref); | |
212 | key_ref = make_key_ref(key, 1); | |
213 | } | |
214 | } | |
215 | ||
06ec7be5 | 216 | /* check whether the current task is allowed to view the key (assuming |
d84f4f99 DH |
217 | * non-possession) |
218 | * - the caller holds a spinlock, and thus the RCU read lock, making our | |
219 | * access to __current_cred() safe | |
220 | */ | |
f5895943 | 221 | rc = key_task_permission(key_ref, ctx.cred, KEY_NEED_VIEW); |
06ec7be5 ML |
222 | if (rc < 0) |
223 | return 0; | |
1da177e4 LT |
224 | |
225 | now = current_kernel_time(); | |
226 | ||
76d8aeab | 227 | rcu_read_lock(); |
1da177e4 LT |
228 | |
229 | /* come up with a suitable timeout value */ | |
230 | if (key->expiry == 0) { | |
231 | memcpy(xbuf, "perm", 5); | |
7b1b9164 | 232 | } else if (now.tv_sec >= key->expiry) { |
1da177e4 | 233 | memcpy(xbuf, "expd", 5); |
7b1b9164 | 234 | } else { |
1da177e4 LT |
235 | timo = key->expiry - now.tv_sec; |
236 | ||
237 | if (timo < 60) | |
238 | sprintf(xbuf, "%lus", timo); | |
239 | else if (timo < 60*60) | |
240 | sprintf(xbuf, "%lum", timo / 60); | |
241 | else if (timo < 60*60*24) | |
242 | sprintf(xbuf, "%luh", timo / (60*60)); | |
243 | else if (timo < 60*60*24*7) | |
244 | sprintf(xbuf, "%lud", timo / (60*60*24)); | |
245 | else | |
246 | sprintf(xbuf, "%luw", timo / (60*60*24*7)); | |
247 | } | |
248 | ||
76d8aeab DH |
249 | #define showflag(KEY, LETTER, FLAG) \ |
250 | (test_bit(FLAG, &(KEY)->flags) ? LETTER : '-') | |
251 | ||
fd75815f | 252 | seq_printf(m, "%08x %c%c%c%c%c%c%c %5d %4s %08x %5d %5d %-9.9s ", |
1da177e4 | 253 | key->serial, |
76d8aeab DH |
254 | showflag(key, 'I', KEY_FLAG_INSTANTIATED), |
255 | showflag(key, 'R', KEY_FLAG_REVOKED), | |
256 | showflag(key, 'D', KEY_FLAG_DEAD), | |
257 | showflag(key, 'Q', KEY_FLAG_IN_QUOTA), | |
258 | showflag(key, 'U', KEY_FLAG_USER_CONSTRUCT), | |
259 | showflag(key, 'N', KEY_FLAG_NEGATIVE), | |
fd75815f | 260 | showflag(key, 'i', KEY_FLAG_INVALIDATED), |
1da177e4 LT |
261 | atomic_read(&key->usage), |
262 | xbuf, | |
263 | key->perm, | |
9a56c2db EB |
264 | from_kuid_munged(seq_user_ns(m), key->uid), |
265 | from_kgid_munged(seq_user_ns(m), key->gid), | |
1da177e4 LT |
266 | key->type->name); |
267 | ||
76d8aeab DH |
268 | #undef showflag |
269 | ||
1da177e4 LT |
270 | if (key->type->describe) |
271 | key->type->describe(key, m); | |
272 | seq_putc(m, '\n'); | |
273 | ||
76d8aeab | 274 | rcu_read_unlock(); |
1da177e4 | 275 | return 0; |
1da177e4 LT |
276 | } |
277 | ||
278 | #endif /* CONFIG_KEYS_DEBUG_PROC_KEYS */ | |
279 | ||
9a56c2db | 280 | static struct rb_node *__key_user_next(struct user_namespace *user_ns, struct rb_node *n) |
454804ab SH |
281 | { |
282 | while (n) { | |
283 | struct key_user *user = rb_entry(n, struct key_user, node); | |
9a56c2db | 284 | if (kuid_has_mapping(user_ns, user->uid)) |
454804ab SH |
285 | break; |
286 | n = rb_next(n); | |
287 | } | |
288 | return n; | |
289 | } | |
290 | ||
9a56c2db | 291 | static struct rb_node *key_user_next(struct user_namespace *user_ns, struct rb_node *n) |
454804ab | 292 | { |
9a56c2db | 293 | return __key_user_next(user_ns, rb_next(n)); |
454804ab SH |
294 | } |
295 | ||
9a56c2db | 296 | static struct rb_node *key_user_first(struct user_namespace *user_ns, struct rb_root *r) |
454804ab SH |
297 | { |
298 | struct rb_node *n = rb_first(r); | |
9a56c2db | 299 | return __key_user_next(user_ns, n); |
454804ab | 300 | } |
7b1b9164 | 301 | |
1da177e4 | 302 | /* |
973c9f4f DH |
303 | * Implement "/proc/key-users" to provides a list of the key users and their |
304 | * quotas. | |
1da177e4 LT |
305 | */ |
306 | static int proc_key_users_open(struct inode *inode, struct file *file) | |
307 | { | |
308 | return seq_open(file, &proc_key_users_ops); | |
1da177e4 LT |
309 | } |
310 | ||
311 | static void *proc_key_users_start(struct seq_file *p, loff_t *_pos) | |
86abcf9c | 312 | __acquires(key_user_lock) |
1da177e4 LT |
313 | { |
314 | struct rb_node *_p; | |
315 | loff_t pos = *_pos; | |
316 | ||
317 | spin_lock(&key_user_lock); | |
318 | ||
9a56c2db | 319 | _p = key_user_first(seq_user_ns(p), &key_user_tree); |
1da177e4 LT |
320 | while (pos > 0 && _p) { |
321 | pos--; | |
9a56c2db | 322 | _p = key_user_next(seq_user_ns(p), _p); |
1da177e4 LT |
323 | } |
324 | ||
325 | return _p; | |
1da177e4 LT |
326 | } |
327 | ||
328 | static void *proc_key_users_next(struct seq_file *p, void *v, loff_t *_pos) | |
329 | { | |
330 | (*_pos)++; | |
9a56c2db | 331 | return key_user_next(seq_user_ns(p), (struct rb_node *)v); |
1da177e4 LT |
332 | } |
333 | ||
334 | static void proc_key_users_stop(struct seq_file *p, void *v) | |
86abcf9c | 335 | __releases(key_user_lock) |
1da177e4 LT |
336 | { |
337 | spin_unlock(&key_user_lock); | |
338 | } | |
339 | ||
340 | static int proc_key_users_show(struct seq_file *m, void *v) | |
341 | { | |
342 | struct rb_node *_p = v; | |
343 | struct key_user *user = rb_entry(_p, struct key_user, node); | |
9a56c2db | 344 | unsigned maxkeys = uid_eq(user->uid, GLOBAL_ROOT_UID) ? |
0b77f5bf | 345 | key_quota_root_maxkeys : key_quota_maxkeys; |
9a56c2db | 346 | unsigned maxbytes = uid_eq(user->uid, GLOBAL_ROOT_UID) ? |
0b77f5bf | 347 | key_quota_root_maxbytes : key_quota_maxbytes; |
1da177e4 LT |
348 | |
349 | seq_printf(m, "%5u: %5d %d/%d %d/%d %d/%d\n", | |
9a56c2db | 350 | from_kuid_munged(seq_user_ns(m), user->uid), |
1da177e4 LT |
351 | atomic_read(&user->usage), |
352 | atomic_read(&user->nkeys), | |
353 | atomic_read(&user->nikeys), | |
354 | user->qnkeys, | |
0b77f5bf | 355 | maxkeys, |
1da177e4 | 356 | user->qnbytes, |
0b77f5bf | 357 | maxbytes); |
1da177e4 LT |
358 | |
359 | return 0; | |
1da177e4 | 360 | } |