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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 | ||
1da177e4 LT |
21 | static void *proc_keys_start(struct seq_file *p, loff_t *_pos); |
22 | static void *proc_keys_next(struct seq_file *p, void *v, loff_t *_pos); | |
23 | static void proc_keys_stop(struct seq_file *p, void *v); | |
24 | static int proc_keys_show(struct seq_file *m, void *v); | |
25 | ||
1996a109 | 26 | static const struct seq_operations proc_keys_ops = { |
1da177e4 LT |
27 | .start = proc_keys_start, |
28 | .next = proc_keys_next, | |
29 | .stop = proc_keys_stop, | |
30 | .show = proc_keys_show, | |
31 | }; | |
32 | ||
1da177e4 LT |
33 | static void *proc_key_users_start(struct seq_file *p, loff_t *_pos); |
34 | static void *proc_key_users_next(struct seq_file *p, void *v, loff_t *_pos); | |
35 | static void proc_key_users_stop(struct seq_file *p, void *v); | |
36 | static int proc_key_users_show(struct seq_file *m, void *v); | |
37 | ||
1996a109 | 38 | static const struct seq_operations proc_key_users_ops = { |
1da177e4 LT |
39 | .start = proc_key_users_start, |
40 | .next = proc_key_users_next, | |
41 | .stop = proc_key_users_stop, | |
42 | .show = proc_key_users_show, | |
43 | }; | |
44 | ||
1da177e4 | 45 | /* |
973c9f4f | 46 | * Declare the /proc files. |
1da177e4 LT |
47 | */ |
48 | static int __init key_proc_init(void) | |
49 | { | |
50 | struct proc_dir_entry *p; | |
51 | ||
fddda2b7 | 52 | p = proc_create_seq("keys", 0, NULL, &proc_keys_ops); |
1da177e4 LT |
53 | if (!p) |
54 | panic("Cannot create /proc/keys\n"); | |
1da177e4 | 55 | |
fddda2b7 | 56 | p = proc_create_seq("key-users", 0, NULL, &proc_key_users_ops); |
1da177e4 LT |
57 | if (!p) |
58 | panic("Cannot create /proc/key-users\n"); | |
59 | ||
1da177e4 | 60 | return 0; |
a8b17ed0 | 61 | } |
1da177e4 LT |
62 | |
63 | __initcall(key_proc_init); | |
64 | ||
1da177e4 | 65 | /* |
973c9f4f DH |
66 | * Implement "/proc/keys" to provide a list of the keys on the system that |
67 | * grant View permission to the caller. | |
1da177e4 | 68 | */ |
9a56c2db | 69 | static struct rb_node *key_serial_next(struct seq_file *p, struct rb_node *n) |
454804ab | 70 | { |
9a56c2db | 71 | struct user_namespace *user_ns = seq_user_ns(p); |
ad73a717 SH |
72 | |
73 | n = rb_next(n); | |
454804ab SH |
74 | while (n) { |
75 | struct key *key = rb_entry(n, struct key, serial_node); | |
9a56c2db | 76 | if (kuid_has_mapping(user_ns, key->user->uid)) |
454804ab SH |
77 | break; |
78 | n = rb_next(n); | |
79 | } | |
80 | return n; | |
81 | } | |
82 | ||
9a56c2db | 83 | static struct key *find_ge_key(struct seq_file *p, key_serial_t id) |
454804ab | 84 | { |
9a56c2db | 85 | struct user_namespace *user_ns = seq_user_ns(p); |
ad73a717 SH |
86 | struct rb_node *n = key_serial_tree.rb_node; |
87 | struct key *minkey = NULL; | |
454804ab | 88 | |
ad73a717 SH |
89 | while (n) { |
90 | struct key *key = rb_entry(n, struct key, serial_node); | |
91 | if (id < key->serial) { | |
92 | if (!minkey || minkey->serial > key->serial) | |
93 | minkey = key; | |
94 | n = n->rb_left; | |
95 | } else if (id > key->serial) { | |
96 | n = n->rb_right; | |
97 | } else { | |
98 | minkey = key; | |
99 | break; | |
100 | } | |
101 | key = NULL; | |
102 | } | |
1da177e4 | 103 | |
ad73a717 SH |
104 | if (!minkey) |
105 | return NULL; | |
106 | ||
107 | for (;;) { | |
9a56c2db | 108 | if (kuid_has_mapping(user_ns, minkey->user->uid)) |
ad73a717 SH |
109 | return minkey; |
110 | n = rb_next(&minkey->serial_node); | |
111 | if (!n) | |
112 | return NULL; | |
113 | minkey = rb_entry(n, struct key, serial_node); | |
114 | } | |
1da177e4 LT |
115 | } |
116 | ||
117 | static void *proc_keys_start(struct seq_file *p, loff_t *_pos) | |
86abcf9c | 118 | __acquires(key_serial_lock) |
1da177e4 | 119 | { |
ad73a717 SH |
120 | key_serial_t pos = *_pos; |
121 | struct key *key; | |
1da177e4 LT |
122 | |
123 | spin_lock(&key_serial_lock); | |
124 | ||
ad73a717 SH |
125 | if (*_pos > INT_MAX) |
126 | return NULL; | |
9a56c2db | 127 | key = find_ge_key(p, pos); |
ad73a717 SH |
128 | if (!key) |
129 | return NULL; | |
130 | *_pos = key->serial; | |
131 | return &key->serial_node; | |
132 | } | |
1da177e4 | 133 | |
ad73a717 SH |
134 | static inline key_serial_t key_node_serial(struct rb_node *n) |
135 | { | |
136 | struct key *key = rb_entry(n, struct key, serial_node); | |
137 | return key->serial; | |
1da177e4 LT |
138 | } |
139 | ||
140 | static void *proc_keys_next(struct seq_file *p, void *v, loff_t *_pos) | |
141 | { | |
ad73a717 | 142 | struct rb_node *n; |
1da177e4 | 143 | |
9a56c2db | 144 | n = key_serial_next(p, v); |
ad73a717 SH |
145 | if (n) |
146 | *_pos = key_node_serial(n); | |
147 | return n; | |
1da177e4 LT |
148 | } |
149 | ||
150 | static void proc_keys_stop(struct seq_file *p, void *v) | |
86abcf9c | 151 | __releases(key_serial_lock) |
1da177e4 LT |
152 | { |
153 | spin_unlock(&key_serial_lock); | |
154 | } | |
155 | ||
156 | static int proc_keys_show(struct seq_file *m, void *v) | |
157 | { | |
158 | struct rb_node *_p = v; | |
159 | struct key *key = rb_entry(_p, struct key, serial_node); | |
ab5c69f0 | 160 | unsigned long flags; |
927942aa | 161 | key_ref_t key_ref, skey_ref; |
074d5898 | 162 | time64_t now, expiry; |
03dab869 | 163 | char xbuf[16]; |
363b02da | 164 | short state; |
074d5898 | 165 | u64 timo; |
06ec7be5 ML |
166 | int rc; |
167 | ||
4bdf0bc3 DH |
168 | struct keyring_search_context ctx = { |
169 | .index_key.type = key->type, | |
170 | .index_key.description = key->description, | |
4aa68e07 | 171 | .cred = m->file->f_cred, |
46291959 DH |
172 | .match_data.cmp = lookup_user_key_possessed, |
173 | .match_data.raw_data = key, | |
174 | .match_data.lookup_type = KEYRING_SEARCH_LOOKUP_DIRECT, | |
175 | .flags = KEYRING_SEARCH_NO_STATE_CHECK, | |
4bdf0bc3 DH |
176 | }; |
177 | ||
927942aa DH |
178 | key_ref = make_key_ref(key, 0); |
179 | ||
180 | /* determine if the key is possessed by this process (a test we can | |
181 | * skip if the key does not indicate the possessor can view it | |
182 | */ | |
183 | if (key->perm & KEY_POS_VIEW) { | |
4bdf0bc3 | 184 | skey_ref = search_my_process_keyrings(&ctx); |
927942aa DH |
185 | if (!IS_ERR(skey_ref)) { |
186 | key_ref_put(skey_ref); | |
187 | key_ref = make_key_ref(key, 1); | |
188 | } | |
189 | } | |
190 | ||
4aa68e07 | 191 | /* check whether the current task is allowed to view the key */ |
f5895943 | 192 | rc = key_task_permission(key_ref, ctx.cred, KEY_NEED_VIEW); |
06ec7be5 ML |
193 | if (rc < 0) |
194 | return 0; | |
1da177e4 | 195 | |
074d5898 | 196 | now = ktime_get_real_seconds(); |
1da177e4 | 197 | |
76d8aeab | 198 | rcu_read_lock(); |
1da177e4 LT |
199 | |
200 | /* come up with a suitable timeout value */ | |
ab5c69f0 EB |
201 | expiry = READ_ONCE(key->expiry); |
202 | if (expiry == 0) { | |
1da177e4 | 203 | memcpy(xbuf, "perm", 5); |
074d5898 | 204 | } else if (now >= expiry) { |
1da177e4 | 205 | memcpy(xbuf, "expd", 5); |
7b1b9164 | 206 | } else { |
074d5898 | 207 | timo = expiry - now; |
1da177e4 LT |
208 | |
209 | if (timo < 60) | |
074d5898 | 210 | sprintf(xbuf, "%llus", timo); |
1da177e4 | 211 | else if (timo < 60*60) |
074d5898 | 212 | sprintf(xbuf, "%llum", div_u64(timo, 60)); |
1da177e4 | 213 | else if (timo < 60*60*24) |
074d5898 | 214 | sprintf(xbuf, "%lluh", div_u64(timo, 60 * 60)); |
1da177e4 | 215 | else if (timo < 60*60*24*7) |
074d5898 | 216 | sprintf(xbuf, "%llud", div_u64(timo, 60 * 60 * 24)); |
1da177e4 | 217 | else |
074d5898 | 218 | sprintf(xbuf, "%lluw", div_u64(timo, 60 * 60 * 24 * 7)); |
1da177e4 LT |
219 | } |
220 | ||
363b02da DH |
221 | state = key_read_state(key); |
222 | ||
ab5c69f0 EB |
223 | #define showflag(FLAGS, LETTER, FLAG) \ |
224 | ((FLAGS & (1 << FLAG)) ? LETTER : '-') | |
76d8aeab | 225 | |
ab5c69f0 | 226 | flags = READ_ONCE(key->flags); |
fd75815f | 227 | seq_printf(m, "%08x %c%c%c%c%c%c%c %5d %4s %08x %5d %5d %-9.9s ", |
1da177e4 | 228 | key->serial, |
363b02da | 229 | state != KEY_IS_UNINSTANTIATED ? 'I' : '-', |
ab5c69f0 EB |
230 | showflag(flags, 'R', KEY_FLAG_REVOKED), |
231 | showflag(flags, 'D', KEY_FLAG_DEAD), | |
232 | showflag(flags, 'Q', KEY_FLAG_IN_QUOTA), | |
233 | showflag(flags, 'U', KEY_FLAG_USER_CONSTRUCT), | |
363b02da | 234 | state < 0 ? 'N' : '-', |
ab5c69f0 | 235 | showflag(flags, 'i', KEY_FLAG_INVALIDATED), |
fff29291 | 236 | refcount_read(&key->usage), |
1da177e4 LT |
237 | xbuf, |
238 | key->perm, | |
9a56c2db EB |
239 | from_kuid_munged(seq_user_ns(m), key->uid), |
240 | from_kgid_munged(seq_user_ns(m), key->gid), | |
1da177e4 LT |
241 | key->type->name); |
242 | ||
76d8aeab DH |
243 | #undef showflag |
244 | ||
1da177e4 LT |
245 | if (key->type->describe) |
246 | key->type->describe(key, m); | |
247 | seq_putc(m, '\n'); | |
248 | ||
76d8aeab | 249 | rcu_read_unlock(); |
1da177e4 | 250 | return 0; |
1da177e4 LT |
251 | } |
252 | ||
9a56c2db | 253 | static struct rb_node *__key_user_next(struct user_namespace *user_ns, struct rb_node *n) |
454804ab SH |
254 | { |
255 | while (n) { | |
256 | struct key_user *user = rb_entry(n, struct key_user, node); | |
9a56c2db | 257 | if (kuid_has_mapping(user_ns, user->uid)) |
454804ab SH |
258 | break; |
259 | n = rb_next(n); | |
260 | } | |
261 | return n; | |
262 | } | |
263 | ||
9a56c2db | 264 | static struct rb_node *key_user_next(struct user_namespace *user_ns, struct rb_node *n) |
454804ab | 265 | { |
9a56c2db | 266 | return __key_user_next(user_ns, rb_next(n)); |
454804ab SH |
267 | } |
268 | ||
9a56c2db | 269 | static struct rb_node *key_user_first(struct user_namespace *user_ns, struct rb_root *r) |
454804ab SH |
270 | { |
271 | struct rb_node *n = rb_first(r); | |
9a56c2db | 272 | return __key_user_next(user_ns, n); |
454804ab | 273 | } |
7b1b9164 | 274 | |
1da177e4 | 275 | static void *proc_key_users_start(struct seq_file *p, loff_t *_pos) |
86abcf9c | 276 | __acquires(key_user_lock) |
1da177e4 LT |
277 | { |
278 | struct rb_node *_p; | |
279 | loff_t pos = *_pos; | |
280 | ||
281 | spin_lock(&key_user_lock); | |
282 | ||
9a56c2db | 283 | _p = key_user_first(seq_user_ns(p), &key_user_tree); |
1da177e4 LT |
284 | while (pos > 0 && _p) { |
285 | pos--; | |
9a56c2db | 286 | _p = key_user_next(seq_user_ns(p), _p); |
1da177e4 LT |
287 | } |
288 | ||
289 | return _p; | |
1da177e4 LT |
290 | } |
291 | ||
292 | static void *proc_key_users_next(struct seq_file *p, void *v, loff_t *_pos) | |
293 | { | |
294 | (*_pos)++; | |
9a56c2db | 295 | return key_user_next(seq_user_ns(p), (struct rb_node *)v); |
1da177e4 LT |
296 | } |
297 | ||
298 | static void proc_key_users_stop(struct seq_file *p, void *v) | |
86abcf9c | 299 | __releases(key_user_lock) |
1da177e4 LT |
300 | { |
301 | spin_unlock(&key_user_lock); | |
302 | } | |
303 | ||
304 | static int proc_key_users_show(struct seq_file *m, void *v) | |
305 | { | |
306 | struct rb_node *_p = v; | |
307 | struct key_user *user = rb_entry(_p, struct key_user, node); | |
9a56c2db | 308 | unsigned maxkeys = uid_eq(user->uid, GLOBAL_ROOT_UID) ? |
0b77f5bf | 309 | key_quota_root_maxkeys : key_quota_maxkeys; |
9a56c2db | 310 | unsigned maxbytes = uid_eq(user->uid, GLOBAL_ROOT_UID) ? |
0b77f5bf | 311 | key_quota_root_maxbytes : key_quota_maxbytes; |
1da177e4 LT |
312 | |
313 | seq_printf(m, "%5u: %5d %d/%d %d/%d %d/%d\n", | |
9a56c2db | 314 | from_kuid_munged(seq_user_ns(m), user->uid), |
ddb99e11 | 315 | refcount_read(&user->usage), |
1da177e4 LT |
316 | atomic_read(&user->nkeys), |
317 | atomic_read(&user->nikeys), | |
318 | user->qnkeys, | |
0b77f5bf | 319 | maxkeys, |
1da177e4 | 320 | user->qnbytes, |
0b77f5bf | 321 | maxbytes); |
1da177e4 LT |
322 | |
323 | return 0; | |
1da177e4 | 324 | } |