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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 | ||
94 | static int proc_keys_open(struct inode *inode, struct file *file) | |
95 | { | |
96 | return seq_open(file, &proc_keys_ops); | |
97 | ||
98 | } | |
99 | ||
100 | static void *proc_keys_start(struct seq_file *p, loff_t *_pos) | |
101 | { | |
102 | struct rb_node *_p; | |
103 | loff_t pos = *_pos; | |
104 | ||
105 | spin_lock(&key_serial_lock); | |
106 | ||
107 | _p = rb_first(&key_serial_tree); | |
108 | while (pos > 0 && _p) { | |
109 | pos--; | |
110 | _p = rb_next(_p); | |
111 | } | |
112 | ||
113 | return _p; | |
114 | ||
115 | } | |
116 | ||
117 | static void *proc_keys_next(struct seq_file *p, void *v, loff_t *_pos) | |
118 | { | |
119 | (*_pos)++; | |
120 | return rb_next((struct rb_node *) v); | |
121 | ||
122 | } | |
123 | ||
124 | static void proc_keys_stop(struct seq_file *p, void *v) | |
125 | { | |
126 | spin_unlock(&key_serial_lock); | |
127 | } | |
128 | ||
129 | static int proc_keys_show(struct seq_file *m, void *v) | |
130 | { | |
131 | struct rb_node *_p = v; | |
132 | struct key *key = rb_entry(_p, struct key, serial_node); | |
133 | struct timespec now; | |
134 | unsigned long timo; | |
135 | char xbuf[12]; | |
06ec7be5 ML |
136 | int rc; |
137 | ||
138 | /* check whether the current task is allowed to view the key (assuming | |
d84f4f99 DH |
139 | * non-possession) |
140 | * - the caller holds a spinlock, and thus the RCU read lock, making our | |
141 | * access to __current_cred() safe | |
142 | */ | |
143 | rc = key_task_permission(make_key_ref(key, 0), current_cred(), | |
144 | KEY_VIEW); | |
06ec7be5 ML |
145 | if (rc < 0) |
146 | return 0; | |
1da177e4 LT |
147 | |
148 | now = current_kernel_time(); | |
149 | ||
76d8aeab | 150 | rcu_read_lock(); |
1da177e4 LT |
151 | |
152 | /* come up with a suitable timeout value */ | |
153 | if (key->expiry == 0) { | |
154 | memcpy(xbuf, "perm", 5); | |
155 | } | |
156 | else if (now.tv_sec >= key->expiry) { | |
157 | memcpy(xbuf, "expd", 5); | |
158 | } | |
159 | else { | |
160 | timo = key->expiry - now.tv_sec; | |
161 | ||
162 | if (timo < 60) | |
163 | sprintf(xbuf, "%lus", timo); | |
164 | else if (timo < 60*60) | |
165 | sprintf(xbuf, "%lum", timo / 60); | |
166 | else if (timo < 60*60*24) | |
167 | sprintf(xbuf, "%luh", timo / (60*60)); | |
168 | else if (timo < 60*60*24*7) | |
169 | sprintf(xbuf, "%lud", timo / (60*60*24)); | |
170 | else | |
171 | sprintf(xbuf, "%luw", timo / (60*60*24*7)); | |
172 | } | |
173 | ||
76d8aeab DH |
174 | #define showflag(KEY, LETTER, FLAG) \ |
175 | (test_bit(FLAG, &(KEY)->flags) ? LETTER : '-') | |
176 | ||
664cceb0 | 177 | seq_printf(m, "%08x %c%c%c%c%c%c %5d %4s %08x %5d %5d %-9.9s ", |
1da177e4 | 178 | key->serial, |
76d8aeab DH |
179 | showflag(key, 'I', KEY_FLAG_INSTANTIATED), |
180 | showflag(key, 'R', KEY_FLAG_REVOKED), | |
181 | showflag(key, 'D', KEY_FLAG_DEAD), | |
182 | showflag(key, 'Q', KEY_FLAG_IN_QUOTA), | |
183 | showflag(key, 'U', KEY_FLAG_USER_CONSTRUCT), | |
184 | showflag(key, 'N', KEY_FLAG_NEGATIVE), | |
1da177e4 LT |
185 | atomic_read(&key->usage), |
186 | xbuf, | |
187 | key->perm, | |
188 | key->uid, | |
189 | key->gid, | |
190 | key->type->name); | |
191 | ||
76d8aeab DH |
192 | #undef showflag |
193 | ||
1da177e4 LT |
194 | if (key->type->describe) |
195 | key->type->describe(key, m); | |
196 | seq_putc(m, '\n'); | |
197 | ||
76d8aeab | 198 | rcu_read_unlock(); |
1da177e4 LT |
199 | |
200 | return 0; | |
201 | ||
202 | } | |
203 | ||
204 | #endif /* CONFIG_KEYS_DEBUG_PROC_KEYS */ | |
205 | ||
206 | /*****************************************************************************/ | |
207 | /* | |
208 | * implement "/proc/key-users" to provides a list of the key users | |
209 | */ | |
210 | static int proc_key_users_open(struct inode *inode, struct file *file) | |
211 | { | |
212 | return seq_open(file, &proc_key_users_ops); | |
213 | ||
214 | } | |
215 | ||
216 | static void *proc_key_users_start(struct seq_file *p, loff_t *_pos) | |
217 | { | |
218 | struct rb_node *_p; | |
219 | loff_t pos = *_pos; | |
220 | ||
221 | spin_lock(&key_user_lock); | |
222 | ||
223 | _p = rb_first(&key_user_tree); | |
224 | while (pos > 0 && _p) { | |
225 | pos--; | |
226 | _p = rb_next(_p); | |
227 | } | |
228 | ||
229 | return _p; | |
230 | ||
231 | } | |
232 | ||
233 | static void *proc_key_users_next(struct seq_file *p, void *v, loff_t *_pos) | |
234 | { | |
235 | (*_pos)++; | |
236 | return rb_next((struct rb_node *) v); | |
237 | ||
238 | } | |
239 | ||
240 | static void proc_key_users_stop(struct seq_file *p, void *v) | |
241 | { | |
242 | spin_unlock(&key_user_lock); | |
243 | } | |
244 | ||
245 | static int proc_key_users_show(struct seq_file *m, void *v) | |
246 | { | |
247 | struct rb_node *_p = v; | |
248 | struct key_user *user = rb_entry(_p, struct key_user, node); | |
0b77f5bf DH |
249 | unsigned maxkeys = (user->uid == 0) ? |
250 | key_quota_root_maxkeys : key_quota_maxkeys; | |
251 | unsigned maxbytes = (user->uid == 0) ? | |
252 | key_quota_root_maxbytes : key_quota_maxbytes; | |
1da177e4 LT |
253 | |
254 | seq_printf(m, "%5u: %5d %d/%d %d/%d %d/%d\n", | |
255 | user->uid, | |
256 | atomic_read(&user->usage), | |
257 | atomic_read(&user->nkeys), | |
258 | atomic_read(&user->nikeys), | |
259 | user->qnkeys, | |
0b77f5bf | 260 | maxkeys, |
1da177e4 | 261 | user->qnbytes, |
0b77f5bf | 262 | maxbytes); |
1da177e4 LT |
263 | |
264 | return 0; | |
265 | ||
266 | } |