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 | ||
1da177e4 LT |
12 | #include <linux/init.h> |
13 | #include <linux/sched.h> | |
1da177e4 LT |
14 | #include <linux/fs.h> |
15 | #include <linux/proc_fs.h> | |
16 | #include <linux/seq_file.h> | |
17 | #include <asm/errno.h> | |
18 | #include "internal.h" | |
19 | ||
1da177e4 LT |
20 | static void *proc_keys_start(struct seq_file *p, loff_t *_pos); |
21 | static void *proc_keys_next(struct seq_file *p, void *v, loff_t *_pos); | |
22 | static void proc_keys_stop(struct seq_file *p, void *v); | |
23 | static int proc_keys_show(struct seq_file *m, void *v); | |
24 | ||
1996a109 | 25 | static const struct seq_operations proc_keys_ops = { |
1da177e4 LT |
26 | .start = proc_keys_start, |
27 | .next = proc_keys_next, | |
28 | .stop = proc_keys_stop, | |
29 | .show = proc_keys_show, | |
30 | }; | |
31 | ||
1da177e4 LT |
32 | static void *proc_key_users_start(struct seq_file *p, loff_t *_pos); |
33 | static void *proc_key_users_next(struct seq_file *p, void *v, loff_t *_pos); | |
34 | static void proc_key_users_stop(struct seq_file *p, void *v); | |
35 | static int proc_key_users_show(struct seq_file *m, void *v); | |
36 | ||
1996a109 | 37 | static const struct seq_operations proc_key_users_ops = { |
1da177e4 LT |
38 | .start = proc_key_users_start, |
39 | .next = proc_key_users_next, | |
40 | .stop = proc_key_users_stop, | |
41 | .show = proc_key_users_show, | |
42 | }; | |
43 | ||
1da177e4 | 44 | /* |
973c9f4f | 45 | * Declare the /proc files. |
1da177e4 LT |
46 | */ |
47 | static int __init key_proc_init(void) | |
48 | { | |
49 | struct proc_dir_entry *p; | |
50 | ||
fddda2b7 | 51 | p = proc_create_seq("keys", 0, NULL, &proc_keys_ops); |
1da177e4 LT |
52 | if (!p) |
53 | panic("Cannot create /proc/keys\n"); | |
1da177e4 | 54 | |
fddda2b7 | 55 | p = proc_create_seq("key-users", 0, NULL, &proc_key_users_ops); |
1da177e4 LT |
56 | if (!p) |
57 | panic("Cannot create /proc/key-users\n"); | |
58 | ||
1da177e4 | 59 | return 0; |
a8b17ed0 | 60 | } |
1da177e4 LT |
61 | |
62 | __initcall(key_proc_init); | |
63 | ||
1da177e4 | 64 | /* |
973c9f4f DH |
65 | * Implement "/proc/keys" to provide a list of the keys on the system that |
66 | * grant View permission to the caller. | |
1da177e4 | 67 | */ |
9a56c2db | 68 | static struct rb_node *key_serial_next(struct seq_file *p, struct rb_node *n) |
454804ab | 69 | { |
9a56c2db | 70 | struct user_namespace *user_ns = seq_user_ns(p); |
ad73a717 SH |
71 | |
72 | n = rb_next(n); | |
454804ab SH |
73 | while (n) { |
74 | struct key *key = rb_entry(n, struct key, serial_node); | |
9a56c2db | 75 | if (kuid_has_mapping(user_ns, key->user->uid)) |
454804ab SH |
76 | break; |
77 | n = rb_next(n); | |
78 | } | |
79 | return n; | |
80 | } | |
81 | ||
9a56c2db | 82 | static struct key *find_ge_key(struct seq_file *p, key_serial_t id) |
454804ab | 83 | { |
9a56c2db | 84 | struct user_namespace *user_ns = seq_user_ns(p); |
ad73a717 SH |
85 | struct rb_node *n = key_serial_tree.rb_node; |
86 | struct key *minkey = NULL; | |
454804ab | 87 | |
ad73a717 SH |
88 | while (n) { |
89 | struct key *key = rb_entry(n, struct key, serial_node); | |
90 | if (id < key->serial) { | |
91 | if (!minkey || minkey->serial > key->serial) | |
92 | minkey = key; | |
93 | n = n->rb_left; | |
94 | } else if (id > key->serial) { | |
95 | n = n->rb_right; | |
96 | } else { | |
97 | minkey = key; | |
98 | break; | |
99 | } | |
100 | key = NULL; | |
101 | } | |
1da177e4 | 102 | |
ad73a717 SH |
103 | if (!minkey) |
104 | return NULL; | |
105 | ||
106 | for (;;) { | |
9a56c2db | 107 | if (kuid_has_mapping(user_ns, minkey->user->uid)) |
ad73a717 SH |
108 | return minkey; |
109 | n = rb_next(&minkey->serial_node); | |
110 | if (!n) | |
111 | return NULL; | |
112 | minkey = rb_entry(n, struct key, serial_node); | |
113 | } | |
1da177e4 LT |
114 | } |
115 | ||
116 | static void *proc_keys_start(struct seq_file *p, loff_t *_pos) | |
86abcf9c | 117 | __acquires(key_serial_lock) |
1da177e4 | 118 | { |
ad73a717 SH |
119 | key_serial_t pos = *_pos; |
120 | struct key *key; | |
1da177e4 LT |
121 | |
122 | spin_lock(&key_serial_lock); | |
123 | ||
ad73a717 SH |
124 | if (*_pos > INT_MAX) |
125 | return NULL; | |
9a56c2db | 126 | key = find_ge_key(p, pos); |
ad73a717 SH |
127 | if (!key) |
128 | return NULL; | |
129 | *_pos = key->serial; | |
130 | return &key->serial_node; | |
131 | } | |
1da177e4 | 132 | |
ad73a717 SH |
133 | static inline key_serial_t key_node_serial(struct rb_node *n) |
134 | { | |
135 | struct key *key = rb_entry(n, struct key, serial_node); | |
136 | return key->serial; | |
1da177e4 LT |
137 | } |
138 | ||
139 | static void *proc_keys_next(struct seq_file *p, void *v, loff_t *_pos) | |
140 | { | |
ad73a717 | 141 | struct rb_node *n; |
1da177e4 | 142 | |
9a56c2db | 143 | n = key_serial_next(p, v); |
ad73a717 SH |
144 | if (n) |
145 | *_pos = key_node_serial(n); | |
146 | return n; | |
1da177e4 LT |
147 | } |
148 | ||
149 | static void proc_keys_stop(struct seq_file *p, void *v) | |
86abcf9c | 150 | __releases(key_serial_lock) |
1da177e4 LT |
151 | { |
152 | spin_unlock(&key_serial_lock); | |
153 | } | |
154 | ||
155 | static int proc_keys_show(struct seq_file *m, void *v) | |
156 | { | |
157 | struct rb_node *_p = v; | |
158 | struct key *key = rb_entry(_p, struct key, serial_node); | |
ab5c69f0 | 159 | unsigned long flags; |
927942aa | 160 | key_ref_t key_ref, skey_ref; |
074d5898 | 161 | time64_t now, expiry; |
03dab869 | 162 | char xbuf[16]; |
363b02da | 163 | short state; |
074d5898 | 164 | u64 timo; |
06ec7be5 ML |
165 | int rc; |
166 | ||
4bdf0bc3 | 167 | struct keyring_search_context ctx = { |
ede0fa98 | 168 | .index_key = key->index_key, |
4aa68e07 | 169 | .cred = m->file->f_cred, |
46291959 DH |
170 | .match_data.cmp = lookup_user_key_possessed, |
171 | .match_data.raw_data = key, | |
172 | .match_data.lookup_type = KEYRING_SEARCH_LOOKUP_DIRECT, | |
173 | .flags = KEYRING_SEARCH_NO_STATE_CHECK, | |
4bdf0bc3 DH |
174 | }; |
175 | ||
927942aa DH |
176 | key_ref = make_key_ref(key, 0); |
177 | ||
178 | /* determine if the key is possessed by this process (a test we can | |
179 | * skip if the key does not indicate the possessor can view it | |
180 | */ | |
181 | if (key->perm & KEY_POS_VIEW) { | |
4bdf0bc3 | 182 | skey_ref = search_my_process_keyrings(&ctx); |
927942aa DH |
183 | if (!IS_ERR(skey_ref)) { |
184 | key_ref_put(skey_ref); | |
185 | key_ref = make_key_ref(key, 1); | |
186 | } | |
187 | } | |
188 | ||
4aa68e07 | 189 | /* check whether the current task is allowed to view the key */ |
f5895943 | 190 | rc = key_task_permission(key_ref, ctx.cred, KEY_NEED_VIEW); |
06ec7be5 ML |
191 | if (rc < 0) |
192 | return 0; | |
1da177e4 | 193 | |
074d5898 | 194 | now = ktime_get_real_seconds(); |
1da177e4 | 195 | |
76d8aeab | 196 | rcu_read_lock(); |
1da177e4 LT |
197 | |
198 | /* come up with a suitable timeout value */ | |
ab5c69f0 EB |
199 | expiry = READ_ONCE(key->expiry); |
200 | if (expiry == 0) { | |
1da177e4 | 201 | memcpy(xbuf, "perm", 5); |
074d5898 | 202 | } else if (now >= expiry) { |
1da177e4 | 203 | memcpy(xbuf, "expd", 5); |
7b1b9164 | 204 | } else { |
074d5898 | 205 | timo = expiry - now; |
1da177e4 LT |
206 | |
207 | if (timo < 60) | |
074d5898 | 208 | sprintf(xbuf, "%llus", timo); |
1da177e4 | 209 | else if (timo < 60*60) |
074d5898 | 210 | sprintf(xbuf, "%llum", div_u64(timo, 60)); |
1da177e4 | 211 | else if (timo < 60*60*24) |
074d5898 | 212 | sprintf(xbuf, "%lluh", div_u64(timo, 60 * 60)); |
1da177e4 | 213 | else if (timo < 60*60*24*7) |
074d5898 | 214 | sprintf(xbuf, "%llud", div_u64(timo, 60 * 60 * 24)); |
1da177e4 | 215 | else |
074d5898 | 216 | sprintf(xbuf, "%lluw", div_u64(timo, 60 * 60 * 24 * 7)); |
1da177e4 LT |
217 | } |
218 | ||
363b02da DH |
219 | state = key_read_state(key); |
220 | ||
ab5c69f0 EB |
221 | #define showflag(FLAGS, LETTER, FLAG) \ |
222 | ((FLAGS & (1 << FLAG)) ? LETTER : '-') | |
76d8aeab | 223 | |
ab5c69f0 | 224 | flags = READ_ONCE(key->flags); |
fd75815f | 225 | seq_printf(m, "%08x %c%c%c%c%c%c%c %5d %4s %08x %5d %5d %-9.9s ", |
1da177e4 | 226 | key->serial, |
363b02da | 227 | state != KEY_IS_UNINSTANTIATED ? 'I' : '-', |
ab5c69f0 EB |
228 | showflag(flags, 'R', KEY_FLAG_REVOKED), |
229 | showflag(flags, 'D', KEY_FLAG_DEAD), | |
230 | showflag(flags, 'Q', KEY_FLAG_IN_QUOTA), | |
231 | showflag(flags, 'U', KEY_FLAG_USER_CONSTRUCT), | |
363b02da | 232 | state < 0 ? 'N' : '-', |
ab5c69f0 | 233 | showflag(flags, 'i', KEY_FLAG_INVALIDATED), |
fff29291 | 234 | refcount_read(&key->usage), |
1da177e4 LT |
235 | xbuf, |
236 | key->perm, | |
9a56c2db EB |
237 | from_kuid_munged(seq_user_ns(m), key->uid), |
238 | from_kgid_munged(seq_user_ns(m), key->gid), | |
1da177e4 LT |
239 | key->type->name); |
240 | ||
76d8aeab DH |
241 | #undef showflag |
242 | ||
1da177e4 LT |
243 | if (key->type->describe) |
244 | key->type->describe(key, m); | |
245 | seq_putc(m, '\n'); | |
246 | ||
76d8aeab | 247 | rcu_read_unlock(); |
1da177e4 | 248 | return 0; |
1da177e4 LT |
249 | } |
250 | ||
9a56c2db | 251 | static struct rb_node *__key_user_next(struct user_namespace *user_ns, struct rb_node *n) |
454804ab SH |
252 | { |
253 | while (n) { | |
254 | struct key_user *user = rb_entry(n, struct key_user, node); | |
9a56c2db | 255 | if (kuid_has_mapping(user_ns, user->uid)) |
454804ab SH |
256 | break; |
257 | n = rb_next(n); | |
258 | } | |
259 | return n; | |
260 | } | |
261 | ||
9a56c2db | 262 | static struct rb_node *key_user_next(struct user_namespace *user_ns, struct rb_node *n) |
454804ab | 263 | { |
9a56c2db | 264 | return __key_user_next(user_ns, rb_next(n)); |
454804ab SH |
265 | } |
266 | ||
9a56c2db | 267 | static struct rb_node *key_user_first(struct user_namespace *user_ns, struct rb_root *r) |
454804ab SH |
268 | { |
269 | struct rb_node *n = rb_first(r); | |
9a56c2db | 270 | return __key_user_next(user_ns, n); |
454804ab | 271 | } |
7b1b9164 | 272 | |
1da177e4 | 273 | static void *proc_key_users_start(struct seq_file *p, loff_t *_pos) |
86abcf9c | 274 | __acquires(key_user_lock) |
1da177e4 LT |
275 | { |
276 | struct rb_node *_p; | |
277 | loff_t pos = *_pos; | |
278 | ||
279 | spin_lock(&key_user_lock); | |
280 | ||
9a56c2db | 281 | _p = key_user_first(seq_user_ns(p), &key_user_tree); |
1da177e4 LT |
282 | while (pos > 0 && _p) { |
283 | pos--; | |
9a56c2db | 284 | _p = key_user_next(seq_user_ns(p), _p); |
1da177e4 LT |
285 | } |
286 | ||
287 | return _p; | |
1da177e4 LT |
288 | } |
289 | ||
290 | static void *proc_key_users_next(struct seq_file *p, void *v, loff_t *_pos) | |
291 | { | |
292 | (*_pos)++; | |
9a56c2db | 293 | return key_user_next(seq_user_ns(p), (struct rb_node *)v); |
1da177e4 LT |
294 | } |
295 | ||
296 | static void proc_key_users_stop(struct seq_file *p, void *v) | |
86abcf9c | 297 | __releases(key_user_lock) |
1da177e4 LT |
298 | { |
299 | spin_unlock(&key_user_lock); | |
300 | } | |
301 | ||
302 | static int proc_key_users_show(struct seq_file *m, void *v) | |
303 | { | |
304 | struct rb_node *_p = v; | |
305 | struct key_user *user = rb_entry(_p, struct key_user, node); | |
9a56c2db | 306 | unsigned maxkeys = uid_eq(user->uid, GLOBAL_ROOT_UID) ? |
0b77f5bf | 307 | key_quota_root_maxkeys : key_quota_maxkeys; |
9a56c2db | 308 | unsigned maxbytes = uid_eq(user->uid, GLOBAL_ROOT_UID) ? |
0b77f5bf | 309 | key_quota_root_maxbytes : key_quota_maxbytes; |
1da177e4 LT |
310 | |
311 | seq_printf(m, "%5u: %5d %d/%d %d/%d %d/%d\n", | |
9a56c2db | 312 | from_kuid_munged(seq_user_ns(m), user->uid), |
ddb99e11 | 313 | refcount_read(&user->usage), |
1da177e4 LT |
314 | atomic_read(&user->nkeys), |
315 | atomic_read(&user->nikeys), | |
316 | user->qnkeys, | |
0b77f5bf | 317 | maxkeys, |
1da177e4 | 318 | user->qnbytes, |
0b77f5bf | 319 | maxbytes); |
1da177e4 LT |
320 | |
321 | return 0; | |
1da177e4 | 322 | } |