Commit | Line | Data |
---|---|---|
973c9f4f | 1 | /* Userspace key control operations |
1da177e4 | 2 | * |
3e30148c | 3 | * Copyright (C) 2004-5 Red Hat, Inc. All Rights Reserved. |
1da177e4 LT |
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/syscalls.h> | |
59e6b9c1 | 17 | #include <linux/key.h> |
1da177e4 LT |
18 | #include <linux/keyctl.h> |
19 | #include <linux/fs.h> | |
c59ede7b | 20 | #include <linux/capability.h> |
0cb409d9 | 21 | #include <linux/string.h> |
1da177e4 | 22 | #include <linux/err.h> |
38bbca6b | 23 | #include <linux/vmalloc.h> |
70a5bb72 | 24 | #include <linux/security.h> |
a27bb332 | 25 | #include <linux/uio.h> |
1da177e4 LT |
26 | #include <asm/uaccess.h> |
27 | #include "internal.h" | |
28 | ||
aa9d4437 DH |
29 | #define KEY_MAX_DESC_SIZE 4096 |
30 | ||
0cb409d9 DA |
31 | static int key_get_type_from_user(char *type, |
32 | const char __user *_type, | |
33 | unsigned len) | |
34 | { | |
35 | int ret; | |
36 | ||
37 | ret = strncpy_from_user(type, _type, len); | |
0cb409d9 | 38 | if (ret < 0) |
4303ef19 | 39 | return ret; |
0cb409d9 DA |
40 | if (ret == 0 || ret >= len) |
41 | return -EINVAL; | |
54e2c2c1 DH |
42 | if (type[0] == '.') |
43 | return -EPERM; | |
0cb409d9 | 44 | type[len - 1] = '\0'; |
0cb409d9 DA |
45 | return 0; |
46 | } | |
47 | ||
1da177e4 | 48 | /* |
973c9f4f DH |
49 | * Extract the description of a new key from userspace and either add it as a |
50 | * new key to the specified keyring or update a matching key in that keyring. | |
51 | * | |
cf7f601c DH |
52 | * If the description is NULL or an empty string, the key type is asked to |
53 | * generate one from the payload. | |
54 | * | |
973c9f4f DH |
55 | * The keyring must be writable so that we can attach the key to it. |
56 | * | |
57 | * If successful, the new key's serial number is returned, otherwise an error | |
58 | * code is returned. | |
1da177e4 | 59 | */ |
1e7bfb21 HC |
60 | SYSCALL_DEFINE5(add_key, const char __user *, _type, |
61 | const char __user *, _description, | |
62 | const void __user *, _payload, | |
63 | size_t, plen, | |
64 | key_serial_t, ringid) | |
1da177e4 | 65 | { |
664cceb0 | 66 | key_ref_t keyring_ref, key_ref; |
1da177e4 LT |
67 | char type[32], *description; |
68 | void *payload; | |
0cb409d9 | 69 | long ret; |
1da177e4 LT |
70 | |
71 | ret = -EINVAL; | |
38bbca6b | 72 | if (plen > 1024 * 1024 - 1) |
1da177e4 LT |
73 | goto error; |
74 | ||
75 | /* draw all the data into kernel space */ | |
0cb409d9 | 76 | ret = key_get_type_from_user(type, _type, sizeof(type)); |
1da177e4 LT |
77 | if (ret < 0) |
78 | goto error; | |
1da177e4 | 79 | |
cf7f601c DH |
80 | description = NULL; |
81 | if (_description) { | |
aa9d4437 | 82 | description = strndup_user(_description, KEY_MAX_DESC_SIZE); |
cf7f601c DH |
83 | if (IS_ERR(description)) { |
84 | ret = PTR_ERR(description); | |
85 | goto error; | |
86 | } | |
87 | if (!*description) { | |
88 | kfree(description); | |
89 | description = NULL; | |
a4e3b8d7 MZ |
90 | } else if ((description[0] == '.') && |
91 | (strncmp(type, "keyring", 7) == 0)) { | |
92 | ret = -EPERM; | |
93 | goto error2; | |
cf7f601c | 94 | } |
0cb409d9 | 95 | } |
1da177e4 LT |
96 | |
97 | /* pull the payload in if one was supplied */ | |
98 | payload = NULL; | |
99 | ||
100 | if (_payload) { | |
101 | ret = -ENOMEM; | |
4f1c28d2 | 102 | payload = kmalloc(plen, GFP_KERNEL | __GFP_NOWARN); |
38bbca6b DH |
103 | if (!payload) { |
104 | if (plen <= PAGE_SIZE) | |
105 | goto error2; | |
38bbca6b DH |
106 | payload = vmalloc(plen); |
107 | if (!payload) | |
108 | goto error2; | |
109 | } | |
1da177e4 LT |
110 | |
111 | ret = -EFAULT; | |
112 | if (copy_from_user(payload, _payload, plen) != 0) | |
113 | goto error3; | |
114 | } | |
115 | ||
116 | /* find the target keyring (which must be writable) */ | |
f5895943 | 117 | keyring_ref = lookup_user_key(ringid, KEY_LOOKUP_CREATE, KEY_NEED_WRITE); |
664cceb0 DH |
118 | if (IS_ERR(keyring_ref)) { |
119 | ret = PTR_ERR(keyring_ref); | |
1da177e4 LT |
120 | goto error3; |
121 | } | |
122 | ||
123 | /* create or update the requested key and add it to the target | |
124 | * keyring */ | |
664cceb0 | 125 | key_ref = key_create_or_update(keyring_ref, type, description, |
6b79ccb5 AR |
126 | payload, plen, KEY_PERM_UNDEF, |
127 | KEY_ALLOC_IN_QUOTA); | |
664cceb0 DH |
128 | if (!IS_ERR(key_ref)) { |
129 | ret = key_ref_to_ptr(key_ref)->serial; | |
130 | key_ref_put(key_ref); | |
1da177e4 LT |
131 | } |
132 | else { | |
664cceb0 | 133 | ret = PTR_ERR(key_ref); |
1da177e4 LT |
134 | } |
135 | ||
664cceb0 | 136 | key_ref_put(keyring_ref); |
1da177e4 | 137 | error3: |
d0e0eba0 | 138 | kvfree(payload); |
1da177e4 LT |
139 | error2: |
140 | kfree(description); | |
141 | error: | |
142 | return ret; | |
a8b17ed0 | 143 | } |
1da177e4 | 144 | |
1da177e4 | 145 | /* |
973c9f4f DH |
146 | * Search the process keyrings and keyring trees linked from those for a |
147 | * matching key. Keyrings must have appropriate Search permission to be | |
148 | * searched. | |
149 | * | |
150 | * If a key is found, it will be attached to the destination keyring if there's | |
151 | * one specified and the serial number of the key will be returned. | |
152 | * | |
153 | * If no key is found, /sbin/request-key will be invoked if _callout_info is | |
154 | * non-NULL in an attempt to create a key. The _callout_info string will be | |
155 | * passed to /sbin/request-key to aid with completing the request. If the | |
156 | * _callout_info string is "" then it will be changed to "-". | |
1da177e4 | 157 | */ |
1e7bfb21 HC |
158 | SYSCALL_DEFINE4(request_key, const char __user *, _type, |
159 | const char __user *, _description, | |
160 | const char __user *, _callout_info, | |
161 | key_serial_t, destringid) | |
1da177e4 LT |
162 | { |
163 | struct key_type *ktype; | |
664cceb0 DH |
164 | struct key *key; |
165 | key_ref_t dest_ref; | |
4a38e122 | 166 | size_t callout_len; |
1da177e4 | 167 | char type[32], *description, *callout_info; |
0cb409d9 | 168 | long ret; |
1da177e4 LT |
169 | |
170 | /* pull the type into kernel space */ | |
0cb409d9 | 171 | ret = key_get_type_from_user(type, _type, sizeof(type)); |
1da177e4 LT |
172 | if (ret < 0) |
173 | goto error; | |
1260f801 | 174 | |
1da177e4 | 175 | /* pull the description into kernel space */ |
aa9d4437 | 176 | description = strndup_user(_description, KEY_MAX_DESC_SIZE); |
0cb409d9 DA |
177 | if (IS_ERR(description)) { |
178 | ret = PTR_ERR(description); | |
1da177e4 | 179 | goto error; |
0cb409d9 | 180 | } |
1da177e4 LT |
181 | |
182 | /* pull the callout info into kernel space */ | |
183 | callout_info = NULL; | |
4a38e122 | 184 | callout_len = 0; |
1da177e4 | 185 | if (_callout_info) { |
0cb409d9 DA |
186 | callout_info = strndup_user(_callout_info, PAGE_SIZE); |
187 | if (IS_ERR(callout_info)) { | |
188 | ret = PTR_ERR(callout_info); | |
1da177e4 | 189 | goto error2; |
0cb409d9 | 190 | } |
4a38e122 | 191 | callout_len = strlen(callout_info); |
1da177e4 LT |
192 | } |
193 | ||
194 | /* get the destination keyring if specified */ | |
664cceb0 | 195 | dest_ref = NULL; |
1da177e4 | 196 | if (destringid) { |
5593122e | 197 | dest_ref = lookup_user_key(destringid, KEY_LOOKUP_CREATE, |
f5895943 | 198 | KEY_NEED_WRITE); |
664cceb0 DH |
199 | if (IS_ERR(dest_ref)) { |
200 | ret = PTR_ERR(dest_ref); | |
1da177e4 LT |
201 | goto error3; |
202 | } | |
203 | } | |
204 | ||
205 | /* find the key type */ | |
206 | ktype = key_type_lookup(type); | |
207 | if (IS_ERR(ktype)) { | |
208 | ret = PTR_ERR(ktype); | |
209 | goto error4; | |
210 | } | |
211 | ||
212 | /* do the search */ | |
4a38e122 DH |
213 | key = request_key_and_link(ktype, description, callout_info, |
214 | callout_len, NULL, key_ref_to_ptr(dest_ref), | |
7e047ef5 | 215 | KEY_ALLOC_IN_QUOTA); |
1da177e4 LT |
216 | if (IS_ERR(key)) { |
217 | ret = PTR_ERR(key); | |
218 | goto error5; | |
219 | } | |
220 | ||
4aab1e89 DH |
221 | /* wait for the key to finish being constructed */ |
222 | ret = wait_for_key_construction(key, 1); | |
223 | if (ret < 0) | |
224 | goto error6; | |
225 | ||
1da177e4 LT |
226 | ret = key->serial; |
227 | ||
4aab1e89 | 228 | error6: |
3e30148c | 229 | key_put(key); |
c5b60b5e | 230 | error5: |
1da177e4 | 231 | key_type_put(ktype); |
c5b60b5e | 232 | error4: |
664cceb0 | 233 | key_ref_put(dest_ref); |
c5b60b5e | 234 | error3: |
1da177e4 | 235 | kfree(callout_info); |
c5b60b5e | 236 | error2: |
1da177e4 | 237 | kfree(description); |
c5b60b5e | 238 | error: |
1da177e4 | 239 | return ret; |
a8b17ed0 | 240 | } |
1da177e4 | 241 | |
1da177e4 | 242 | /* |
973c9f4f DH |
243 | * Get the ID of the specified process keyring. |
244 | * | |
245 | * The requested keyring must have search permission to be found. | |
246 | * | |
247 | * If successful, the ID of the requested keyring will be returned. | |
1da177e4 LT |
248 | */ |
249 | long keyctl_get_keyring_ID(key_serial_t id, int create) | |
250 | { | |
664cceb0 | 251 | key_ref_t key_ref; |
5593122e | 252 | unsigned long lflags; |
1da177e4 LT |
253 | long ret; |
254 | ||
5593122e | 255 | lflags = create ? KEY_LOOKUP_CREATE : 0; |
f5895943 | 256 | key_ref = lookup_user_key(id, lflags, KEY_NEED_SEARCH); |
664cceb0 DH |
257 | if (IS_ERR(key_ref)) { |
258 | ret = PTR_ERR(key_ref); | |
1da177e4 LT |
259 | goto error; |
260 | } | |
261 | ||
664cceb0 DH |
262 | ret = key_ref_to_ptr(key_ref)->serial; |
263 | key_ref_put(key_ref); | |
c5b60b5e | 264 | error: |
1da177e4 | 265 | return ret; |
973c9f4f | 266 | } |
1da177e4 | 267 | |
1da177e4 | 268 | /* |
973c9f4f DH |
269 | * Join a (named) session keyring. |
270 | * | |
271 | * Create and join an anonymous session keyring or join a named session | |
272 | * keyring, creating it if necessary. A named session keyring must have Search | |
273 | * permission for it to be joined. Session keyrings without this permit will | |
274 | * be skipped over. | |
275 | * | |
276 | * If successful, the ID of the joined session keyring will be returned. | |
1da177e4 LT |
277 | */ |
278 | long keyctl_join_session_keyring(const char __user *_name) | |
279 | { | |
280 | char *name; | |
0cb409d9 | 281 | long ret; |
1da177e4 LT |
282 | |
283 | /* fetch the name from userspace */ | |
284 | name = NULL; | |
285 | if (_name) { | |
aa9d4437 | 286 | name = strndup_user(_name, KEY_MAX_DESC_SIZE); |
0cb409d9 DA |
287 | if (IS_ERR(name)) { |
288 | ret = PTR_ERR(name); | |
1da177e4 | 289 | goto error; |
0cb409d9 | 290 | } |
1da177e4 LT |
291 | } |
292 | ||
293 | /* join the session */ | |
294 | ret = join_session_keyring(name); | |
0d54ee1c | 295 | kfree(name); |
1da177e4 | 296 | |
c5b60b5e | 297 | error: |
1da177e4 | 298 | return ret; |
a8b17ed0 | 299 | } |
1da177e4 | 300 | |
1da177e4 | 301 | /* |
973c9f4f DH |
302 | * Update a key's data payload from the given data. |
303 | * | |
304 | * The key must grant the caller Write permission and the key type must support | |
305 | * updating for this to work. A negative key can be positively instantiated | |
306 | * with this call. | |
307 | * | |
308 | * If successful, 0 will be returned. If the key type does not support | |
309 | * updating, then -EOPNOTSUPP will be returned. | |
1da177e4 LT |
310 | */ |
311 | long keyctl_update_key(key_serial_t id, | |
312 | const void __user *_payload, | |
313 | size_t plen) | |
314 | { | |
664cceb0 | 315 | key_ref_t key_ref; |
1da177e4 LT |
316 | void *payload; |
317 | long ret; | |
318 | ||
319 | ret = -EINVAL; | |
320 | if (plen > PAGE_SIZE) | |
321 | goto error; | |
322 | ||
323 | /* pull the payload in if one was supplied */ | |
324 | payload = NULL; | |
325 | if (_payload) { | |
326 | ret = -ENOMEM; | |
327 | payload = kmalloc(plen, GFP_KERNEL); | |
328 | if (!payload) | |
329 | goto error; | |
330 | ||
331 | ret = -EFAULT; | |
332 | if (copy_from_user(payload, _payload, plen) != 0) | |
333 | goto error2; | |
334 | } | |
335 | ||
336 | /* find the target key (which must be writable) */ | |
f5895943 | 337 | key_ref = lookup_user_key(id, 0, KEY_NEED_WRITE); |
664cceb0 DH |
338 | if (IS_ERR(key_ref)) { |
339 | ret = PTR_ERR(key_ref); | |
1da177e4 LT |
340 | goto error2; |
341 | } | |
342 | ||
343 | /* update the key */ | |
664cceb0 | 344 | ret = key_update(key_ref, payload, plen); |
1da177e4 | 345 | |
664cceb0 | 346 | key_ref_put(key_ref); |
c5b60b5e | 347 | error2: |
1da177e4 | 348 | kfree(payload); |
c5b60b5e | 349 | error: |
1da177e4 | 350 | return ret; |
a8b17ed0 | 351 | } |
1da177e4 | 352 | |
1da177e4 | 353 | /* |
973c9f4f DH |
354 | * Revoke a key. |
355 | * | |
356 | * The key must be grant the caller Write or Setattr permission for this to | |
357 | * work. The key type should give up its quota claim when revoked. The key | |
358 | * and any links to the key will be automatically garbage collected after a | |
359 | * certain amount of time (/proc/sys/kernel/keys/gc_delay). | |
360 | * | |
361 | * If successful, 0 is returned. | |
1da177e4 LT |
362 | */ |
363 | long keyctl_revoke_key(key_serial_t id) | |
364 | { | |
664cceb0 | 365 | key_ref_t key_ref; |
1da177e4 LT |
366 | long ret; |
367 | ||
f5895943 | 368 | key_ref = lookup_user_key(id, 0, KEY_NEED_WRITE); |
664cceb0 DH |
369 | if (IS_ERR(key_ref)) { |
370 | ret = PTR_ERR(key_ref); | |
0c2c9a3f DH |
371 | if (ret != -EACCES) |
372 | goto error; | |
f5895943 | 373 | key_ref = lookup_user_key(id, 0, KEY_NEED_SETATTR); |
0c2c9a3f DH |
374 | if (IS_ERR(key_ref)) { |
375 | ret = PTR_ERR(key_ref); | |
376 | goto error; | |
377 | } | |
1da177e4 LT |
378 | } |
379 | ||
664cceb0 | 380 | key_revoke(key_ref_to_ptr(key_ref)); |
1da177e4 LT |
381 | ret = 0; |
382 | ||
664cceb0 | 383 | key_ref_put(key_ref); |
c5b60b5e | 384 | error: |
1260f801 | 385 | return ret; |
a8b17ed0 | 386 | } |
1da177e4 | 387 | |
fd75815f DH |
388 | /* |
389 | * Invalidate a key. | |
390 | * | |
391 | * The key must be grant the caller Invalidate permission for this to work. | |
392 | * The key and any links to the key will be automatically garbage collected | |
393 | * immediately. | |
394 | * | |
395 | * If successful, 0 is returned. | |
396 | */ | |
397 | long keyctl_invalidate_key(key_serial_t id) | |
398 | { | |
399 | key_ref_t key_ref; | |
400 | long ret; | |
401 | ||
402 | kenter("%d", id); | |
403 | ||
f5895943 | 404 | key_ref = lookup_user_key(id, 0, KEY_NEED_SEARCH); |
fd75815f DH |
405 | if (IS_ERR(key_ref)) { |
406 | ret = PTR_ERR(key_ref); | |
0c7774ab DH |
407 | |
408 | /* Root is permitted to invalidate certain special keys */ | |
409 | if (capable(CAP_SYS_ADMIN)) { | |
410 | key_ref = lookup_user_key(id, 0, 0); | |
411 | if (IS_ERR(key_ref)) | |
412 | goto error; | |
413 | if (test_bit(KEY_FLAG_ROOT_CAN_INVAL, | |
414 | &key_ref_to_ptr(key_ref)->flags)) | |
415 | goto invalidate; | |
416 | goto error_put; | |
417 | } | |
418 | ||
fd75815f DH |
419 | goto error; |
420 | } | |
421 | ||
0c7774ab | 422 | invalidate: |
fd75815f DH |
423 | key_invalidate(key_ref_to_ptr(key_ref)); |
424 | ret = 0; | |
0c7774ab | 425 | error_put: |
fd75815f DH |
426 | key_ref_put(key_ref); |
427 | error: | |
428 | kleave(" = %ld", ret); | |
429 | return ret; | |
430 | } | |
431 | ||
1da177e4 | 432 | /* |
973c9f4f DH |
433 | * Clear the specified keyring, creating an empty process keyring if one of the |
434 | * special keyring IDs is used. | |
435 | * | |
436 | * The keyring must grant the caller Write permission for this to work. If | |
437 | * successful, 0 will be returned. | |
1da177e4 LT |
438 | */ |
439 | long keyctl_keyring_clear(key_serial_t ringid) | |
440 | { | |
664cceb0 | 441 | key_ref_t keyring_ref; |
1da177e4 LT |
442 | long ret; |
443 | ||
f5895943 | 444 | keyring_ref = lookup_user_key(ringid, KEY_LOOKUP_CREATE, KEY_NEED_WRITE); |
664cceb0 DH |
445 | if (IS_ERR(keyring_ref)) { |
446 | ret = PTR_ERR(keyring_ref); | |
700920eb DH |
447 | |
448 | /* Root is permitted to invalidate certain special keyrings */ | |
449 | if (capable(CAP_SYS_ADMIN)) { | |
450 | keyring_ref = lookup_user_key(ringid, 0, 0); | |
451 | if (IS_ERR(keyring_ref)) | |
452 | goto error; | |
453 | if (test_bit(KEY_FLAG_ROOT_CAN_CLEAR, | |
454 | &key_ref_to_ptr(keyring_ref)->flags)) | |
455 | goto clear; | |
456 | goto error_put; | |
457 | } | |
458 | ||
1da177e4 LT |
459 | goto error; |
460 | } | |
461 | ||
700920eb | 462 | clear: |
664cceb0 | 463 | ret = keyring_clear(key_ref_to_ptr(keyring_ref)); |
700920eb | 464 | error_put: |
664cceb0 | 465 | key_ref_put(keyring_ref); |
c5b60b5e | 466 | error: |
1da177e4 | 467 | return ret; |
a8b17ed0 | 468 | } |
1da177e4 | 469 | |
1da177e4 | 470 | /* |
973c9f4f DH |
471 | * Create a link from a keyring to a key if there's no matching key in the |
472 | * keyring, otherwise replace the link to the matching key with a link to the | |
473 | * new key. | |
474 | * | |
475 | * The key must grant the caller Link permission and the the keyring must grant | |
476 | * the caller Write permission. Furthermore, if an additional link is created, | |
477 | * the keyring's quota will be extended. | |
478 | * | |
479 | * If successful, 0 will be returned. | |
1da177e4 LT |
480 | */ |
481 | long keyctl_keyring_link(key_serial_t id, key_serial_t ringid) | |
482 | { | |
664cceb0 | 483 | key_ref_t keyring_ref, key_ref; |
1da177e4 LT |
484 | long ret; |
485 | ||
f5895943 | 486 | keyring_ref = lookup_user_key(ringid, KEY_LOOKUP_CREATE, KEY_NEED_WRITE); |
664cceb0 DH |
487 | if (IS_ERR(keyring_ref)) { |
488 | ret = PTR_ERR(keyring_ref); | |
1da177e4 LT |
489 | goto error; |
490 | } | |
491 | ||
f5895943 | 492 | key_ref = lookup_user_key(id, KEY_LOOKUP_CREATE, KEY_NEED_LINK); |
664cceb0 DH |
493 | if (IS_ERR(key_ref)) { |
494 | ret = PTR_ERR(key_ref); | |
1da177e4 LT |
495 | goto error2; |
496 | } | |
497 | ||
664cceb0 | 498 | ret = key_link(key_ref_to_ptr(keyring_ref), key_ref_to_ptr(key_ref)); |
1da177e4 | 499 | |
664cceb0 | 500 | key_ref_put(key_ref); |
c5b60b5e | 501 | error2: |
664cceb0 | 502 | key_ref_put(keyring_ref); |
c5b60b5e | 503 | error: |
1da177e4 | 504 | return ret; |
a8b17ed0 | 505 | } |
1da177e4 | 506 | |
1da177e4 | 507 | /* |
973c9f4f DH |
508 | * Unlink a key from a keyring. |
509 | * | |
510 | * The keyring must grant the caller Write permission for this to work; the key | |
511 | * itself need not grant the caller anything. If the last link to a key is | |
512 | * removed then that key will be scheduled for destruction. | |
513 | * | |
514 | * If successful, 0 will be returned. | |
1da177e4 LT |
515 | */ |
516 | long keyctl_keyring_unlink(key_serial_t id, key_serial_t ringid) | |
517 | { | |
664cceb0 | 518 | key_ref_t keyring_ref, key_ref; |
1da177e4 LT |
519 | long ret; |
520 | ||
f5895943 | 521 | keyring_ref = lookup_user_key(ringid, 0, KEY_NEED_WRITE); |
664cceb0 DH |
522 | if (IS_ERR(keyring_ref)) { |
523 | ret = PTR_ERR(keyring_ref); | |
1da177e4 LT |
524 | goto error; |
525 | } | |
526 | ||
5593122e | 527 | key_ref = lookup_user_key(id, KEY_LOOKUP_FOR_UNLINK, 0); |
664cceb0 DH |
528 | if (IS_ERR(key_ref)) { |
529 | ret = PTR_ERR(key_ref); | |
1da177e4 LT |
530 | goto error2; |
531 | } | |
532 | ||
664cceb0 | 533 | ret = key_unlink(key_ref_to_ptr(keyring_ref), key_ref_to_ptr(key_ref)); |
1da177e4 | 534 | |
664cceb0 | 535 | key_ref_put(key_ref); |
c5b60b5e | 536 | error2: |
664cceb0 | 537 | key_ref_put(keyring_ref); |
c5b60b5e | 538 | error: |
1da177e4 | 539 | return ret; |
a8b17ed0 | 540 | } |
1da177e4 | 541 | |
1da177e4 | 542 | /* |
973c9f4f DH |
543 | * Return a description of a key to userspace. |
544 | * | |
545 | * The key must grant the caller View permission for this to work. | |
546 | * | |
547 | * If there's a buffer, we place up to buflen bytes of data into it formatted | |
548 | * in the following way: | |
549 | * | |
1da177e4 | 550 | * type;uid;gid;perm;description<NUL> |
973c9f4f DH |
551 | * |
552 | * If successful, we return the amount of description available, irrespective | |
553 | * of how much we may have copied into the buffer. | |
1da177e4 LT |
554 | */ |
555 | long keyctl_describe_key(key_serial_t keyid, | |
556 | char __user *buffer, | |
557 | size_t buflen) | |
558 | { | |
3e30148c | 559 | struct key *key, *instkey; |
664cceb0 | 560 | key_ref_t key_ref; |
aa9d4437 | 561 | char *infobuf; |
1da177e4 | 562 | long ret; |
aa9d4437 | 563 | int desclen, infolen; |
1da177e4 | 564 | |
f5895943 | 565 | key_ref = lookup_user_key(keyid, KEY_LOOKUP_PARTIAL, KEY_NEED_VIEW); |
664cceb0 | 566 | if (IS_ERR(key_ref)) { |
3e30148c DH |
567 | /* viewing a key under construction is permitted if we have the |
568 | * authorisation token handy */ | |
664cceb0 | 569 | if (PTR_ERR(key_ref) == -EACCES) { |
3e30148c DH |
570 | instkey = key_get_instantiation_authkey(keyid); |
571 | if (!IS_ERR(instkey)) { | |
572 | key_put(instkey); | |
8bbf4976 | 573 | key_ref = lookup_user_key(keyid, |
5593122e DH |
574 | KEY_LOOKUP_PARTIAL, |
575 | 0); | |
664cceb0 | 576 | if (!IS_ERR(key_ref)) |
3e30148c DH |
577 | goto okay; |
578 | } | |
579 | } | |
580 | ||
664cceb0 | 581 | ret = PTR_ERR(key_ref); |
1da177e4 LT |
582 | goto error; |
583 | } | |
584 | ||
3e30148c | 585 | okay: |
664cceb0 | 586 | key = key_ref_to_ptr(key_ref); |
aa9d4437 | 587 | desclen = strlen(key->description); |
664cceb0 | 588 | |
aa9d4437 DH |
589 | /* calculate how much information we're going to return */ |
590 | ret = -ENOMEM; | |
591 | infobuf = kasprintf(GFP_KERNEL, | |
592 | "%s;%d;%d;%08x;", | |
593 | key->type->name, | |
594 | from_kuid_munged(current_user_ns(), key->uid), | |
595 | from_kgid_munged(current_user_ns(), key->gid), | |
596 | key->perm); | |
597 | if (!infobuf) | |
598 | goto error2; | |
599 | infolen = strlen(infobuf); | |
600 | ret = infolen + desclen + 1; | |
1da177e4 LT |
601 | |
602 | /* consider returning the data */ | |
aa9d4437 DH |
603 | if (buffer && buflen >= ret) { |
604 | if (copy_to_user(buffer, infobuf, infolen) != 0 || | |
605 | copy_to_user(buffer + infolen, key->description, | |
606 | desclen + 1) != 0) | |
1da177e4 LT |
607 | ret = -EFAULT; |
608 | } | |
609 | ||
aa9d4437 | 610 | kfree(infobuf); |
c5b60b5e | 611 | error2: |
664cceb0 | 612 | key_ref_put(key_ref); |
c5b60b5e | 613 | error: |
1da177e4 | 614 | return ret; |
a8b17ed0 | 615 | } |
1da177e4 | 616 | |
1da177e4 | 617 | /* |
973c9f4f DH |
618 | * Search the specified keyring and any keyrings it links to for a matching |
619 | * key. Only keyrings that grant the caller Search permission will be searched | |
620 | * (this includes the starting keyring). Only keys with Search permission can | |
621 | * be found. | |
622 | * | |
623 | * If successful, the found key will be linked to the destination keyring if | |
624 | * supplied and the key has Link permission, and the found key ID will be | |
625 | * returned. | |
1da177e4 LT |
626 | */ |
627 | long keyctl_keyring_search(key_serial_t ringid, | |
628 | const char __user *_type, | |
629 | const char __user *_description, | |
630 | key_serial_t destringid) | |
631 | { | |
632 | struct key_type *ktype; | |
664cceb0 | 633 | key_ref_t keyring_ref, key_ref, dest_ref; |
1da177e4 | 634 | char type[32], *description; |
0cb409d9 | 635 | long ret; |
1da177e4 LT |
636 | |
637 | /* pull the type and description into kernel space */ | |
0cb409d9 | 638 | ret = key_get_type_from_user(type, _type, sizeof(type)); |
1da177e4 LT |
639 | if (ret < 0) |
640 | goto error; | |
1da177e4 | 641 | |
aa9d4437 | 642 | description = strndup_user(_description, KEY_MAX_DESC_SIZE); |
0cb409d9 DA |
643 | if (IS_ERR(description)) { |
644 | ret = PTR_ERR(description); | |
1da177e4 | 645 | goto error; |
0cb409d9 | 646 | } |
1da177e4 LT |
647 | |
648 | /* get the keyring at which to begin the search */ | |
f5895943 | 649 | keyring_ref = lookup_user_key(ringid, 0, KEY_NEED_SEARCH); |
664cceb0 DH |
650 | if (IS_ERR(keyring_ref)) { |
651 | ret = PTR_ERR(keyring_ref); | |
1da177e4 LT |
652 | goto error2; |
653 | } | |
654 | ||
655 | /* get the destination keyring if specified */ | |
664cceb0 | 656 | dest_ref = NULL; |
1da177e4 | 657 | if (destringid) { |
5593122e | 658 | dest_ref = lookup_user_key(destringid, KEY_LOOKUP_CREATE, |
f5895943 | 659 | KEY_NEED_WRITE); |
664cceb0 DH |
660 | if (IS_ERR(dest_ref)) { |
661 | ret = PTR_ERR(dest_ref); | |
1da177e4 LT |
662 | goto error3; |
663 | } | |
664 | } | |
665 | ||
666 | /* find the key type */ | |
667 | ktype = key_type_lookup(type); | |
668 | if (IS_ERR(ktype)) { | |
669 | ret = PTR_ERR(ktype); | |
670 | goto error4; | |
671 | } | |
672 | ||
673 | /* do the search */ | |
664cceb0 DH |
674 | key_ref = keyring_search(keyring_ref, ktype, description); |
675 | if (IS_ERR(key_ref)) { | |
676 | ret = PTR_ERR(key_ref); | |
1da177e4 LT |
677 | |
678 | /* treat lack or presence of a negative key the same */ | |
679 | if (ret == -EAGAIN) | |
680 | ret = -ENOKEY; | |
681 | goto error5; | |
682 | } | |
683 | ||
684 | /* link the resulting key to the destination keyring if we can */ | |
664cceb0 | 685 | if (dest_ref) { |
f5895943 | 686 | ret = key_permission(key_ref, KEY_NEED_LINK); |
29db9190 | 687 | if (ret < 0) |
1da177e4 LT |
688 | goto error6; |
689 | ||
664cceb0 | 690 | ret = key_link(key_ref_to_ptr(dest_ref), key_ref_to_ptr(key_ref)); |
1da177e4 LT |
691 | if (ret < 0) |
692 | goto error6; | |
693 | } | |
694 | ||
664cceb0 | 695 | ret = key_ref_to_ptr(key_ref)->serial; |
1da177e4 | 696 | |
c5b60b5e | 697 | error6: |
664cceb0 | 698 | key_ref_put(key_ref); |
c5b60b5e | 699 | error5: |
1da177e4 | 700 | key_type_put(ktype); |
c5b60b5e | 701 | error4: |
664cceb0 | 702 | key_ref_put(dest_ref); |
c5b60b5e | 703 | error3: |
664cceb0 | 704 | key_ref_put(keyring_ref); |
c5b60b5e | 705 | error2: |
1da177e4 | 706 | kfree(description); |
c5b60b5e | 707 | error: |
1da177e4 | 708 | return ret; |
a8b17ed0 | 709 | } |
1da177e4 | 710 | |
1da177e4 | 711 | /* |
973c9f4f DH |
712 | * Read a key's payload. |
713 | * | |
714 | * The key must either grant the caller Read permission, or it must grant the | |
715 | * caller Search permission when searched for from the process keyrings. | |
716 | * | |
717 | * If successful, we place up to buflen bytes of data into the buffer, if one | |
718 | * is provided, and return the amount of data that is available in the key, | |
719 | * irrespective of how much we copied into the buffer. | |
1da177e4 LT |
720 | */ |
721 | long keyctl_read_key(key_serial_t keyid, char __user *buffer, size_t buflen) | |
722 | { | |
664cceb0 DH |
723 | struct key *key; |
724 | key_ref_t key_ref; | |
1da177e4 LT |
725 | long ret; |
726 | ||
727 | /* find the key first */ | |
5593122e | 728 | key_ref = lookup_user_key(keyid, 0, 0); |
664cceb0 DH |
729 | if (IS_ERR(key_ref)) { |
730 | ret = -ENOKEY; | |
731 | goto error; | |
1da177e4 LT |
732 | } |
733 | ||
664cceb0 DH |
734 | key = key_ref_to_ptr(key_ref); |
735 | ||
736 | /* see if we can read it directly */ | |
f5895943 | 737 | ret = key_permission(key_ref, KEY_NEED_READ); |
29db9190 | 738 | if (ret == 0) |
664cceb0 | 739 | goto can_read_key; |
29db9190 DH |
740 | if (ret != -EACCES) |
741 | goto error; | |
664cceb0 DH |
742 | |
743 | /* we can't; see if it's searchable from this process's keyrings | |
744 | * - we automatically take account of the fact that it may be | |
745 | * dangling off an instantiation key | |
746 | */ | |
747 | if (!is_key_possessed(key_ref)) { | |
748 | ret = -EACCES; | |
749 | goto error2; | |
750 | } | |
1da177e4 LT |
751 | |
752 | /* the key is probably readable - now try to read it */ | |
c5b60b5e | 753 | can_read_key: |
1da177e4 LT |
754 | ret = key_validate(key); |
755 | if (ret == 0) { | |
756 | ret = -EOPNOTSUPP; | |
757 | if (key->type->read) { | |
758 | /* read the data with the semaphore held (since we | |
759 | * might sleep) */ | |
760 | down_read(&key->sem); | |
761 | ret = key->type->read(key, buffer, buflen); | |
762 | up_read(&key->sem); | |
763 | } | |
764 | } | |
765 | ||
c5b60b5e | 766 | error2: |
1da177e4 | 767 | key_put(key); |
c5b60b5e | 768 | error: |
1da177e4 | 769 | return ret; |
a8b17ed0 | 770 | } |
1da177e4 | 771 | |
1da177e4 | 772 | /* |
973c9f4f DH |
773 | * Change the ownership of a key |
774 | * | |
775 | * The key must grant the caller Setattr permission for this to work, though | |
776 | * the key need not be fully instantiated yet. For the UID to be changed, or | |
777 | * for the GID to be changed to a group the caller is not a member of, the | |
778 | * caller must have sysadmin capability. If either uid or gid is -1 then that | |
779 | * attribute is not changed. | |
780 | * | |
781 | * If the UID is to be changed, the new user must have sufficient quota to | |
782 | * accept the key. The quota deduction will be removed from the old user to | |
783 | * the new user should the attribute be changed. | |
784 | * | |
785 | * If successful, 0 will be returned. | |
1da177e4 | 786 | */ |
9a56c2db | 787 | long keyctl_chown_key(key_serial_t id, uid_t user, gid_t group) |
1da177e4 | 788 | { |
5801649d | 789 | struct key_user *newowner, *zapowner = NULL; |
1da177e4 | 790 | struct key *key; |
664cceb0 | 791 | key_ref_t key_ref; |
1da177e4 | 792 | long ret; |
9a56c2db EB |
793 | kuid_t uid; |
794 | kgid_t gid; | |
795 | ||
796 | uid = make_kuid(current_user_ns(), user); | |
797 | gid = make_kgid(current_user_ns(), group); | |
798 | ret = -EINVAL; | |
799 | if ((user != (uid_t) -1) && !uid_valid(uid)) | |
800 | goto error; | |
801 | if ((group != (gid_t) -1) && !gid_valid(gid)) | |
802 | goto error; | |
1da177e4 LT |
803 | |
804 | ret = 0; | |
9a56c2db | 805 | if (user == (uid_t) -1 && group == (gid_t) -1) |
1da177e4 LT |
806 | goto error; |
807 | ||
5593122e | 808 | key_ref = lookup_user_key(id, KEY_LOOKUP_CREATE | KEY_LOOKUP_PARTIAL, |
f5895943 | 809 | KEY_NEED_SETATTR); |
664cceb0 DH |
810 | if (IS_ERR(key_ref)) { |
811 | ret = PTR_ERR(key_ref); | |
1da177e4 LT |
812 | goto error; |
813 | } | |
814 | ||
664cceb0 DH |
815 | key = key_ref_to_ptr(key_ref); |
816 | ||
1da177e4 LT |
817 | /* make the changes with the locks held to prevent chown/chown races */ |
818 | ret = -EACCES; | |
819 | down_write(&key->sem); | |
1da177e4 LT |
820 | |
821 | if (!capable(CAP_SYS_ADMIN)) { | |
822 | /* only the sysadmin can chown a key to some other UID */ | |
9a56c2db | 823 | if (user != (uid_t) -1 && !uid_eq(key->uid, uid)) |
5801649d | 824 | goto error_put; |
1da177e4 LT |
825 | |
826 | /* only the sysadmin can set the key's GID to a group other | |
827 | * than one of those that the current process subscribes to */ | |
9a56c2db | 828 | if (group != (gid_t) -1 && !gid_eq(gid, key->gid) && !in_group_p(gid)) |
5801649d | 829 | goto error_put; |
1da177e4 LT |
830 | } |
831 | ||
5801649d | 832 | /* change the UID */ |
9a56c2db | 833 | if (user != (uid_t) -1 && !uid_eq(uid, key->uid)) { |
5801649d | 834 | ret = -ENOMEM; |
9a56c2db | 835 | newowner = key_user_lookup(uid); |
5801649d FT |
836 | if (!newowner) |
837 | goto error_put; | |
838 | ||
839 | /* transfer the quota burden to the new user */ | |
840 | if (test_bit(KEY_FLAG_IN_QUOTA, &key->flags)) { | |
9a56c2db | 841 | unsigned maxkeys = uid_eq(uid, GLOBAL_ROOT_UID) ? |
0b77f5bf | 842 | key_quota_root_maxkeys : key_quota_maxkeys; |
9a56c2db | 843 | unsigned maxbytes = uid_eq(uid, GLOBAL_ROOT_UID) ? |
0b77f5bf DH |
844 | key_quota_root_maxbytes : key_quota_maxbytes; |
845 | ||
5801649d | 846 | spin_lock(&newowner->lock); |
0b77f5bf DH |
847 | if (newowner->qnkeys + 1 >= maxkeys || |
848 | newowner->qnbytes + key->quotalen >= maxbytes || | |
849 | newowner->qnbytes + key->quotalen < | |
850 | newowner->qnbytes) | |
5801649d FT |
851 | goto quota_overrun; |
852 | ||
853 | newowner->qnkeys++; | |
854 | newowner->qnbytes += key->quotalen; | |
855 | spin_unlock(&newowner->lock); | |
856 | ||
857 | spin_lock(&key->user->lock); | |
858 | key->user->qnkeys--; | |
859 | key->user->qnbytes -= key->quotalen; | |
860 | spin_unlock(&key->user->lock); | |
861 | } | |
862 | ||
863 | atomic_dec(&key->user->nkeys); | |
864 | atomic_inc(&newowner->nkeys); | |
865 | ||
866 | if (test_bit(KEY_FLAG_INSTANTIATED, &key->flags)) { | |
867 | atomic_dec(&key->user->nikeys); | |
868 | atomic_inc(&newowner->nikeys); | |
869 | } | |
870 | ||
871 | zapowner = key->user; | |
872 | key->user = newowner; | |
873 | key->uid = uid; | |
1da177e4 LT |
874 | } |
875 | ||
876 | /* change the GID */ | |
9a56c2db | 877 | if (group != (gid_t) -1) |
1da177e4 LT |
878 | key->gid = gid; |
879 | ||
880 | ret = 0; | |
881 | ||
5801649d | 882 | error_put: |
1da177e4 LT |
883 | up_write(&key->sem); |
884 | key_put(key); | |
5801649d FT |
885 | if (zapowner) |
886 | key_user_put(zapowner); | |
887 | error: | |
1da177e4 LT |
888 | return ret; |
889 | ||
5801649d FT |
890 | quota_overrun: |
891 | spin_unlock(&newowner->lock); | |
892 | zapowner = newowner; | |
893 | ret = -EDQUOT; | |
894 | goto error_put; | |
a8b17ed0 | 895 | } |
5801649d | 896 | |
1da177e4 | 897 | /* |
973c9f4f DH |
898 | * Change the permission mask on a key. |
899 | * | |
900 | * The key must grant the caller Setattr permission for this to work, though | |
901 | * the key need not be fully instantiated yet. If the caller does not have | |
902 | * sysadmin capability, it may only change the permission on keys that it owns. | |
1da177e4 LT |
903 | */ |
904 | long keyctl_setperm_key(key_serial_t id, key_perm_t perm) | |
905 | { | |
906 | struct key *key; | |
664cceb0 | 907 | key_ref_t key_ref; |
1da177e4 LT |
908 | long ret; |
909 | ||
910 | ret = -EINVAL; | |
664cceb0 | 911 | if (perm & ~(KEY_POS_ALL | KEY_USR_ALL | KEY_GRP_ALL | KEY_OTH_ALL)) |
1da177e4 LT |
912 | goto error; |
913 | ||
5593122e | 914 | key_ref = lookup_user_key(id, KEY_LOOKUP_CREATE | KEY_LOOKUP_PARTIAL, |
f5895943 | 915 | KEY_NEED_SETATTR); |
664cceb0 DH |
916 | if (IS_ERR(key_ref)) { |
917 | ret = PTR_ERR(key_ref); | |
1da177e4 LT |
918 | goto error; |
919 | } | |
920 | ||
664cceb0 DH |
921 | key = key_ref_to_ptr(key_ref); |
922 | ||
76d8aeab | 923 | /* make the changes with the locks held to prevent chown/chmod races */ |
1da177e4 LT |
924 | ret = -EACCES; |
925 | down_write(&key->sem); | |
1da177e4 | 926 | |
76d8aeab | 927 | /* if we're not the sysadmin, we can only change a key that we own */ |
9a56c2db | 928 | if (capable(CAP_SYS_ADMIN) || uid_eq(key->uid, current_fsuid())) { |
76d8aeab DH |
929 | key->perm = perm; |
930 | ret = 0; | |
931 | } | |
1da177e4 | 932 | |
1da177e4 LT |
933 | up_write(&key->sem); |
934 | key_put(key); | |
76d8aeab | 935 | error: |
1da177e4 | 936 | return ret; |
a8b17ed0 | 937 | } |
1da177e4 | 938 | |
8bbf4976 | 939 | /* |
973c9f4f DH |
940 | * Get the destination keyring for instantiation and check that the caller has |
941 | * Write permission on it. | |
8bbf4976 DH |
942 | */ |
943 | static long get_instantiation_keyring(key_serial_t ringid, | |
944 | struct request_key_auth *rka, | |
945 | struct key **_dest_keyring) | |
946 | { | |
947 | key_ref_t dkref; | |
948 | ||
eca1bf5b DH |
949 | *_dest_keyring = NULL; |
950 | ||
8bbf4976 | 951 | /* just return a NULL pointer if we weren't asked to make a link */ |
eca1bf5b | 952 | if (ringid == 0) |
8bbf4976 | 953 | return 0; |
8bbf4976 DH |
954 | |
955 | /* if a specific keyring is nominated by ID, then use that */ | |
956 | if (ringid > 0) { | |
f5895943 | 957 | dkref = lookup_user_key(ringid, KEY_LOOKUP_CREATE, KEY_NEED_WRITE); |
8bbf4976 DH |
958 | if (IS_ERR(dkref)) |
959 | return PTR_ERR(dkref); | |
960 | *_dest_keyring = key_ref_to_ptr(dkref); | |
961 | return 0; | |
962 | } | |
963 | ||
964 | if (ringid == KEY_SPEC_REQKEY_AUTH_KEY) | |
965 | return -EINVAL; | |
966 | ||
967 | /* otherwise specify the destination keyring recorded in the | |
968 | * authorisation key (any KEY_SPEC_*_KEYRING) */ | |
969 | if (ringid >= KEY_SPEC_REQUESTOR_KEYRING) { | |
21279cfa | 970 | *_dest_keyring = key_get(rka->dest_keyring); |
8bbf4976 DH |
971 | return 0; |
972 | } | |
973 | ||
974 | return -ENOKEY; | |
975 | } | |
976 | ||
d84f4f99 | 977 | /* |
973c9f4f | 978 | * Change the request_key authorisation key on the current process. |
d84f4f99 DH |
979 | */ |
980 | static int keyctl_change_reqkey_auth(struct key *key) | |
981 | { | |
982 | struct cred *new; | |
983 | ||
984 | new = prepare_creds(); | |
985 | if (!new) | |
986 | return -ENOMEM; | |
987 | ||
988 | key_put(new->request_key_auth); | |
989 | new->request_key_auth = key_get(key); | |
990 | ||
991 | return commit_creds(new); | |
992 | } | |
993 | ||
1da177e4 | 994 | /* |
973c9f4f DH |
995 | * Instantiate a key with the specified payload and link the key into the |
996 | * destination keyring if one is given. | |
997 | * | |
998 | * The caller must have the appropriate instantiation permit set for this to | |
999 | * work (see keyctl_assume_authority). No other permissions are required. | |
1000 | * | |
1001 | * If successful, 0 will be returned. | |
1da177e4 | 1002 | */ |
ee009e4a | 1003 | long keyctl_instantiate_key_common(key_serial_t id, |
b353a1f7 | 1004 | struct iov_iter *from, |
ee009e4a | 1005 | key_serial_t ringid) |
1da177e4 | 1006 | { |
d84f4f99 | 1007 | const struct cred *cred = current_cred(); |
3e30148c | 1008 | struct request_key_auth *rka; |
8bbf4976 | 1009 | struct key *instkey, *dest_keyring; |
b353a1f7 | 1010 | size_t plen = from ? iov_iter_count(from) : 0; |
1da177e4 LT |
1011 | void *payload; |
1012 | long ret; | |
1013 | ||
d84f4f99 DH |
1014 | kenter("%d,,%zu,%d", id, plen, ringid); |
1015 | ||
b353a1f7 AV |
1016 | if (!plen) |
1017 | from = NULL; | |
1018 | ||
1da177e4 | 1019 | ret = -EINVAL; |
38bbca6b | 1020 | if (plen > 1024 * 1024 - 1) |
1da177e4 LT |
1021 | goto error; |
1022 | ||
b5f545c8 DH |
1023 | /* the appropriate instantiation authorisation key must have been |
1024 | * assumed before calling this */ | |
1025 | ret = -EPERM; | |
d84f4f99 | 1026 | instkey = cred->request_key_auth; |
b5f545c8 DH |
1027 | if (!instkey) |
1028 | goto error; | |
1029 | ||
1030 | rka = instkey->payload.data; | |
1031 | if (rka->target_key->serial != id) | |
1032 | goto error; | |
1033 | ||
1da177e4 LT |
1034 | /* pull the payload in if one was supplied */ |
1035 | payload = NULL; | |
1036 | ||
b353a1f7 | 1037 | if (from) { |
1da177e4 LT |
1038 | ret = -ENOMEM; |
1039 | payload = kmalloc(plen, GFP_KERNEL); | |
38bbca6b DH |
1040 | if (!payload) { |
1041 | if (plen <= PAGE_SIZE) | |
1042 | goto error; | |
38bbca6b DH |
1043 | payload = vmalloc(plen); |
1044 | if (!payload) | |
1045 | goto error; | |
1046 | } | |
1da177e4 | 1047 | |
b353a1f7 AV |
1048 | ret = -EFAULT; |
1049 | if (copy_from_iter(payload, plen, from) != plen) | |
1da177e4 LT |
1050 | goto error2; |
1051 | } | |
1052 | ||
3e30148c DH |
1053 | /* find the destination keyring amongst those belonging to the |
1054 | * requesting task */ | |
8bbf4976 DH |
1055 | ret = get_instantiation_keyring(ringid, rka, &dest_keyring); |
1056 | if (ret < 0) | |
1057 | goto error2; | |
1da177e4 LT |
1058 | |
1059 | /* instantiate the key and link it into a keyring */ | |
3e30148c | 1060 | ret = key_instantiate_and_link(rka->target_key, payload, plen, |
8bbf4976 | 1061 | dest_keyring, instkey); |
1da177e4 | 1062 | |
8bbf4976 | 1063 | key_put(dest_keyring); |
b5f545c8 DH |
1064 | |
1065 | /* discard the assumed authority if it's just been disabled by | |
1066 | * instantiation of the key */ | |
d84f4f99 DH |
1067 | if (ret == 0) |
1068 | keyctl_change_reqkey_auth(NULL); | |
b5f545c8 DH |
1069 | |
1070 | error2: | |
b353a1f7 | 1071 | kvfree(payload); |
b5f545c8 | 1072 | error: |
1da177e4 | 1073 | return ret; |
a8b17ed0 | 1074 | } |
1da177e4 | 1075 | |
ee009e4a DH |
1076 | /* |
1077 | * Instantiate a key with the specified payload and link the key into the | |
1078 | * destination keyring if one is given. | |
1079 | * | |
1080 | * The caller must have the appropriate instantiation permit set for this to | |
1081 | * work (see keyctl_assume_authority). No other permissions are required. | |
1082 | * | |
1083 | * If successful, 0 will be returned. | |
1084 | */ | |
1085 | long keyctl_instantiate_key(key_serial_t id, | |
1086 | const void __user *_payload, | |
1087 | size_t plen, | |
1088 | key_serial_t ringid) | |
1089 | { | |
1090 | if (_payload && plen) { | |
b353a1f7 AV |
1091 | struct iovec iov; |
1092 | struct iov_iter from; | |
1093 | int ret; | |
ee009e4a | 1094 | |
b353a1f7 AV |
1095 | ret = import_single_range(WRITE, (void __user *)_payload, plen, |
1096 | &iov, &from); | |
1097 | if (unlikely(ret)) | |
1098 | return ret; | |
1099 | ||
1100 | return keyctl_instantiate_key_common(id, &from, ringid); | |
ee009e4a DH |
1101 | } |
1102 | ||
b353a1f7 | 1103 | return keyctl_instantiate_key_common(id, NULL, ringid); |
ee009e4a DH |
1104 | } |
1105 | ||
1106 | /* | |
1107 | * Instantiate a key with the specified multipart payload and link the key into | |
1108 | * the destination keyring if one is given. | |
1109 | * | |
1110 | * The caller must have the appropriate instantiation permit set for this to | |
1111 | * work (see keyctl_assume_authority). No other permissions are required. | |
1112 | * | |
1113 | * If successful, 0 will be returned. | |
1114 | */ | |
1115 | long keyctl_instantiate_key_iov(key_serial_t id, | |
1116 | const struct iovec __user *_payload_iov, | |
1117 | unsigned ioc, | |
1118 | key_serial_t ringid) | |
1119 | { | |
1120 | struct iovec iovstack[UIO_FASTIOV], *iov = iovstack; | |
b353a1f7 | 1121 | struct iov_iter from; |
ee009e4a DH |
1122 | long ret; |
1123 | ||
b353a1f7 AV |
1124 | if (!_payload_iov) |
1125 | ioc = 0; | |
ee009e4a | 1126 | |
b353a1f7 AV |
1127 | ret = import_iovec(WRITE, _payload_iov, ioc, |
1128 | ARRAY_SIZE(iovstack), &iov, &from); | |
ee009e4a | 1129 | if (ret < 0) |
b353a1f7 AV |
1130 | return ret; |
1131 | ret = keyctl_instantiate_key_common(id, &from, ringid); | |
1132 | kfree(iov); | |
ee009e4a | 1133 | return ret; |
ee009e4a DH |
1134 | } |
1135 | ||
1da177e4 | 1136 | /* |
973c9f4f DH |
1137 | * Negatively instantiate the key with the given timeout (in seconds) and link |
1138 | * the key into the destination keyring if one is given. | |
1139 | * | |
1140 | * The caller must have the appropriate instantiation permit set for this to | |
1141 | * work (see keyctl_assume_authority). No other permissions are required. | |
1142 | * | |
1143 | * The key and any links to the key will be automatically garbage collected | |
1144 | * after the timeout expires. | |
1145 | * | |
1146 | * Negative keys are used to rate limit repeated request_key() calls by causing | |
1147 | * them to return -ENOKEY until the negative key expires. | |
1148 | * | |
1149 | * If successful, 0 will be returned. | |
1da177e4 LT |
1150 | */ |
1151 | long keyctl_negate_key(key_serial_t id, unsigned timeout, key_serial_t ringid) | |
fdd1b945 DH |
1152 | { |
1153 | return keyctl_reject_key(id, timeout, ENOKEY, ringid); | |
1154 | } | |
1155 | ||
1156 | /* | |
1157 | * Negatively instantiate the key with the given timeout (in seconds) and error | |
1158 | * code and link the key into the destination keyring if one is given. | |
1159 | * | |
1160 | * The caller must have the appropriate instantiation permit set for this to | |
1161 | * work (see keyctl_assume_authority). No other permissions are required. | |
1162 | * | |
1163 | * The key and any links to the key will be automatically garbage collected | |
1164 | * after the timeout expires. | |
1165 | * | |
1166 | * Negative keys are used to rate limit repeated request_key() calls by causing | |
1167 | * them to return the specified error code until the negative key expires. | |
1168 | * | |
1169 | * If successful, 0 will be returned. | |
1170 | */ | |
1171 | long keyctl_reject_key(key_serial_t id, unsigned timeout, unsigned error, | |
1172 | key_serial_t ringid) | |
1da177e4 | 1173 | { |
d84f4f99 | 1174 | const struct cred *cred = current_cred(); |
3e30148c | 1175 | struct request_key_auth *rka; |
8bbf4976 | 1176 | struct key *instkey, *dest_keyring; |
1da177e4 LT |
1177 | long ret; |
1178 | ||
fdd1b945 DH |
1179 | kenter("%d,%u,%u,%d", id, timeout, error, ringid); |
1180 | ||
1181 | /* must be a valid error code and mustn't be a kernel special */ | |
1182 | if (error <= 0 || | |
1183 | error >= MAX_ERRNO || | |
1184 | error == ERESTARTSYS || | |
1185 | error == ERESTARTNOINTR || | |
1186 | error == ERESTARTNOHAND || | |
1187 | error == ERESTART_RESTARTBLOCK) | |
1188 | return -EINVAL; | |
d84f4f99 | 1189 | |
b5f545c8 DH |
1190 | /* the appropriate instantiation authorisation key must have been |
1191 | * assumed before calling this */ | |
1192 | ret = -EPERM; | |
d84f4f99 | 1193 | instkey = cred->request_key_auth; |
b5f545c8 | 1194 | if (!instkey) |
1da177e4 | 1195 | goto error; |
1da177e4 | 1196 | |
3e30148c | 1197 | rka = instkey->payload.data; |
b5f545c8 DH |
1198 | if (rka->target_key->serial != id) |
1199 | goto error; | |
3e30148c | 1200 | |
1da177e4 LT |
1201 | /* find the destination keyring if present (which must also be |
1202 | * writable) */ | |
8bbf4976 DH |
1203 | ret = get_instantiation_keyring(ringid, rka, &dest_keyring); |
1204 | if (ret < 0) | |
1205 | goto error; | |
1da177e4 LT |
1206 | |
1207 | /* instantiate the key and link it into a keyring */ | |
fdd1b945 | 1208 | ret = key_reject_and_link(rka->target_key, timeout, error, |
8bbf4976 | 1209 | dest_keyring, instkey); |
1da177e4 | 1210 | |
8bbf4976 | 1211 | key_put(dest_keyring); |
b5f545c8 DH |
1212 | |
1213 | /* discard the assumed authority if it's just been disabled by | |
1214 | * instantiation of the key */ | |
d84f4f99 DH |
1215 | if (ret == 0) |
1216 | keyctl_change_reqkey_auth(NULL); | |
b5f545c8 DH |
1217 | |
1218 | error: | |
1da177e4 | 1219 | return ret; |
a8b17ed0 | 1220 | } |
1da177e4 | 1221 | |
3e30148c | 1222 | /* |
973c9f4f DH |
1223 | * Read or set the default keyring in which request_key() will cache keys and |
1224 | * return the old setting. | |
1225 | * | |
1226 | * If a process keyring is specified then this will be created if it doesn't | |
1227 | * yet exist. The old setting will be returned if successful. | |
3e30148c DH |
1228 | */ |
1229 | long keyctl_set_reqkey_keyring(int reqkey_defl) | |
1230 | { | |
d84f4f99 DH |
1231 | struct cred *new; |
1232 | int ret, old_setting; | |
1233 | ||
1234 | old_setting = current_cred_xxx(jit_keyring); | |
1235 | ||
1236 | if (reqkey_defl == KEY_REQKEY_DEFL_NO_CHANGE) | |
1237 | return old_setting; | |
1238 | ||
1239 | new = prepare_creds(); | |
1240 | if (!new) | |
1241 | return -ENOMEM; | |
3e30148c DH |
1242 | |
1243 | switch (reqkey_defl) { | |
1244 | case KEY_REQKEY_DEFL_THREAD_KEYRING: | |
d84f4f99 | 1245 | ret = install_thread_keyring_to_cred(new); |
3e30148c | 1246 | if (ret < 0) |
d84f4f99 | 1247 | goto error; |
3e30148c DH |
1248 | goto set; |
1249 | ||
1250 | case KEY_REQKEY_DEFL_PROCESS_KEYRING: | |
d84f4f99 DH |
1251 | ret = install_process_keyring_to_cred(new); |
1252 | if (ret < 0) { | |
1253 | if (ret != -EEXIST) | |
1254 | goto error; | |
1255 | ret = 0; | |
1256 | } | |
1257 | goto set; | |
3e30148c DH |
1258 | |
1259 | case KEY_REQKEY_DEFL_DEFAULT: | |
1260 | case KEY_REQKEY_DEFL_SESSION_KEYRING: | |
1261 | case KEY_REQKEY_DEFL_USER_KEYRING: | |
1262 | case KEY_REQKEY_DEFL_USER_SESSION_KEYRING: | |
d84f4f99 DH |
1263 | case KEY_REQKEY_DEFL_REQUESTOR_KEYRING: |
1264 | goto set; | |
3e30148c DH |
1265 | |
1266 | case KEY_REQKEY_DEFL_NO_CHANGE: | |
3e30148c DH |
1267 | case KEY_REQKEY_DEFL_GROUP_KEYRING: |
1268 | default: | |
d84f4f99 DH |
1269 | ret = -EINVAL; |
1270 | goto error; | |
3e30148c DH |
1271 | } |
1272 | ||
d84f4f99 DH |
1273 | set: |
1274 | new->jit_keyring = reqkey_defl; | |
1275 | commit_creds(new); | |
1276 | return old_setting; | |
1277 | error: | |
1278 | abort_creds(new); | |
4303ef19 | 1279 | return ret; |
a8b17ed0 | 1280 | } |
d84f4f99 | 1281 | |
017679c4 | 1282 | /* |
973c9f4f DH |
1283 | * Set or clear the timeout on a key. |
1284 | * | |
1285 | * Either the key must grant the caller Setattr permission or else the caller | |
1286 | * must hold an instantiation authorisation token for the key. | |
1287 | * | |
1288 | * The timeout is either 0 to clear the timeout, or a number of seconds from | |
1289 | * the current time. The key and any links to the key will be automatically | |
1290 | * garbage collected after the timeout expires. | |
1291 | * | |
1292 | * If successful, 0 is returned. | |
017679c4 DH |
1293 | */ |
1294 | long keyctl_set_timeout(key_serial_t id, unsigned timeout) | |
1295 | { | |
9156235b | 1296 | struct key *key, *instkey; |
017679c4 | 1297 | key_ref_t key_ref; |
017679c4 DH |
1298 | long ret; |
1299 | ||
5593122e | 1300 | key_ref = lookup_user_key(id, KEY_LOOKUP_CREATE | KEY_LOOKUP_PARTIAL, |
f5895943 | 1301 | KEY_NEED_SETATTR); |
017679c4 | 1302 | if (IS_ERR(key_ref)) { |
9156235b DH |
1303 | /* setting the timeout on a key under construction is permitted |
1304 | * if we have the authorisation token handy */ | |
1305 | if (PTR_ERR(key_ref) == -EACCES) { | |
1306 | instkey = key_get_instantiation_authkey(id); | |
1307 | if (!IS_ERR(instkey)) { | |
1308 | key_put(instkey); | |
1309 | key_ref = lookup_user_key(id, | |
1310 | KEY_LOOKUP_PARTIAL, | |
1311 | 0); | |
1312 | if (!IS_ERR(key_ref)) | |
1313 | goto okay; | |
1314 | } | |
1315 | } | |
1316 | ||
017679c4 DH |
1317 | ret = PTR_ERR(key_ref); |
1318 | goto error; | |
1319 | } | |
1320 | ||
9156235b | 1321 | okay: |
017679c4 | 1322 | key = key_ref_to_ptr(key_ref); |
59e6b9c1 | 1323 | key_set_timeout(key, timeout); |
017679c4 DH |
1324 | key_put(key); |
1325 | ||
1326 | ret = 0; | |
1327 | error: | |
1328 | return ret; | |
a8b17ed0 | 1329 | } |
017679c4 | 1330 | |
b5f545c8 | 1331 | /* |
973c9f4f DH |
1332 | * Assume (or clear) the authority to instantiate the specified key. |
1333 | * | |
1334 | * This sets the authoritative token currently in force for key instantiation. | |
1335 | * This must be done for a key to be instantiated. It has the effect of making | |
1336 | * available all the keys from the caller of the request_key() that created a | |
1337 | * key to request_key() calls made by the caller of this function. | |
1338 | * | |
1339 | * The caller must have the instantiation key in their process keyrings with a | |
1340 | * Search permission grant available to the caller. | |
1341 | * | |
1342 | * If the ID given is 0, then the setting will be cleared and 0 returned. | |
1343 | * | |
1344 | * If the ID given has a matching an authorisation key, then that key will be | |
1345 | * set and its ID will be returned. The authorisation key can be read to get | |
1346 | * the callout information passed to request_key(). | |
b5f545c8 DH |
1347 | */ |
1348 | long keyctl_assume_authority(key_serial_t id) | |
1349 | { | |
1350 | struct key *authkey; | |
1351 | long ret; | |
1352 | ||
1353 | /* special key IDs aren't permitted */ | |
1354 | ret = -EINVAL; | |
1355 | if (id < 0) | |
1356 | goto error; | |
1357 | ||
1358 | /* we divest ourselves of authority if given an ID of 0 */ | |
1359 | if (id == 0) { | |
d84f4f99 | 1360 | ret = keyctl_change_reqkey_auth(NULL); |
b5f545c8 DH |
1361 | goto error; |
1362 | } | |
1363 | ||
1364 | /* attempt to assume the authority temporarily granted to us whilst we | |
1365 | * instantiate the specified key | |
1366 | * - the authorisation key must be in the current task's keyrings | |
1367 | * somewhere | |
1368 | */ | |
1369 | authkey = key_get_instantiation_authkey(id); | |
1370 | if (IS_ERR(authkey)) { | |
1371 | ret = PTR_ERR(authkey); | |
1372 | goto error; | |
1373 | } | |
1374 | ||
d84f4f99 DH |
1375 | ret = keyctl_change_reqkey_auth(authkey); |
1376 | if (ret < 0) | |
1377 | goto error; | |
1378 | key_put(authkey); | |
b5f545c8 | 1379 | |
d84f4f99 | 1380 | ret = authkey->serial; |
b5f545c8 DH |
1381 | error: |
1382 | return ret; | |
a8b17ed0 | 1383 | } |
b5f545c8 | 1384 | |
70a5bb72 | 1385 | /* |
973c9f4f DH |
1386 | * Get a key's the LSM security label. |
1387 | * | |
1388 | * The key must grant the caller View permission for this to work. | |
1389 | * | |
1390 | * If there's a buffer, then up to buflen bytes of data will be placed into it. | |
1391 | * | |
1392 | * If successful, the amount of information available will be returned, | |
1393 | * irrespective of how much was copied (including the terminal NUL). | |
70a5bb72 DH |
1394 | */ |
1395 | long keyctl_get_security(key_serial_t keyid, | |
1396 | char __user *buffer, | |
1397 | size_t buflen) | |
1398 | { | |
1399 | struct key *key, *instkey; | |
1400 | key_ref_t key_ref; | |
1401 | char *context; | |
1402 | long ret; | |
1403 | ||
f5895943 | 1404 | key_ref = lookup_user_key(keyid, KEY_LOOKUP_PARTIAL, KEY_NEED_VIEW); |
70a5bb72 DH |
1405 | if (IS_ERR(key_ref)) { |
1406 | if (PTR_ERR(key_ref) != -EACCES) | |
1407 | return PTR_ERR(key_ref); | |
1408 | ||
1409 | /* viewing a key under construction is also permitted if we | |
1410 | * have the authorisation token handy */ | |
1411 | instkey = key_get_instantiation_authkey(keyid); | |
1412 | if (IS_ERR(instkey)) | |
fa1cc7b5 | 1413 | return PTR_ERR(instkey); |
70a5bb72 DH |
1414 | key_put(instkey); |
1415 | ||
5593122e | 1416 | key_ref = lookup_user_key(keyid, KEY_LOOKUP_PARTIAL, 0); |
70a5bb72 DH |
1417 | if (IS_ERR(key_ref)) |
1418 | return PTR_ERR(key_ref); | |
1419 | } | |
1420 | ||
1421 | key = key_ref_to_ptr(key_ref); | |
1422 | ret = security_key_getsecurity(key, &context); | |
1423 | if (ret == 0) { | |
1424 | /* if no information was returned, give userspace an empty | |
1425 | * string */ | |
1426 | ret = 1; | |
1427 | if (buffer && buflen > 0 && | |
1428 | copy_to_user(buffer, "", 1) != 0) | |
1429 | ret = -EFAULT; | |
1430 | } else if (ret > 0) { | |
1431 | /* return as much data as there's room for */ | |
1432 | if (buffer && buflen > 0) { | |
1433 | if (buflen > ret) | |
1434 | buflen = ret; | |
1435 | ||
1436 | if (copy_to_user(buffer, context, buflen) != 0) | |
1437 | ret = -EFAULT; | |
1438 | } | |
1439 | ||
1440 | kfree(context); | |
1441 | } | |
1442 | ||
1443 | key_ref_put(key_ref); | |
1444 | return ret; | |
1445 | } | |
1446 | ||
ee18d64c | 1447 | /* |
973c9f4f DH |
1448 | * Attempt to install the calling process's session keyring on the process's |
1449 | * parent process. | |
1450 | * | |
1451 | * The keyring must exist and must grant the caller LINK permission, and the | |
1452 | * parent process must be single-threaded and must have the same effective | |
1453 | * ownership as this process and mustn't be SUID/SGID. | |
1454 | * | |
1455 | * The keyring will be emplaced on the parent when it next resumes userspace. | |
1456 | * | |
1457 | * If successful, 0 will be returned. | |
ee18d64c DH |
1458 | */ |
1459 | long keyctl_session_to_parent(void) | |
1460 | { | |
1461 | struct task_struct *me, *parent; | |
1462 | const struct cred *mycred, *pcred; | |
67d12145 | 1463 | struct callback_head *newwork, *oldwork; |
ee18d64c | 1464 | key_ref_t keyring_r; |
413cd3d9 | 1465 | struct cred *cred; |
ee18d64c DH |
1466 | int ret; |
1467 | ||
f5895943 | 1468 | keyring_r = lookup_user_key(KEY_SPEC_SESSION_KEYRING, 0, KEY_NEED_LINK); |
ee18d64c DH |
1469 | if (IS_ERR(keyring_r)) |
1470 | return PTR_ERR(keyring_r); | |
1471 | ||
413cd3d9 | 1472 | ret = -ENOMEM; |
413cd3d9 | 1473 | |
ee18d64c DH |
1474 | /* our parent is going to need a new cred struct, a new tgcred struct |
1475 | * and new security data, so we allocate them here to prevent ENOMEM in | |
1476 | * our parent */ | |
ee18d64c DH |
1477 | cred = cred_alloc_blank(); |
1478 | if (!cred) | |
67d12145 AV |
1479 | goto error_keyring; |
1480 | newwork = &cred->rcu; | |
ee18d64c | 1481 | |
3a50597d DH |
1482 | cred->session_keyring = key_ref_to_ptr(keyring_r); |
1483 | keyring_r = NULL; | |
67d12145 | 1484 | init_task_work(newwork, key_change_session_keyring); |
ee18d64c DH |
1485 | |
1486 | me = current; | |
9d1ac65a | 1487 | rcu_read_lock(); |
ee18d64c DH |
1488 | write_lock_irq(&tasklist_lock); |
1489 | ||
ee18d64c | 1490 | ret = -EPERM; |
413cd3d9 ON |
1491 | oldwork = NULL; |
1492 | parent = me->real_parent; | |
ee18d64c DH |
1493 | |
1494 | /* the parent mustn't be init and mustn't be a kernel thread */ | |
1495 | if (parent->pid <= 1 || !parent->mm) | |
413cd3d9 | 1496 | goto unlock; |
ee18d64c DH |
1497 | |
1498 | /* the parent must be single threaded */ | |
dd98acf7 | 1499 | if (!thread_group_empty(parent)) |
413cd3d9 | 1500 | goto unlock; |
ee18d64c DH |
1501 | |
1502 | /* the parent and the child must have different session keyrings or | |
1503 | * there's no point */ | |
1504 | mycred = current_cred(); | |
1505 | pcred = __task_cred(parent); | |
1506 | if (mycred == pcred || | |
3a50597d | 1507 | mycred->session_keyring == pcred->session_keyring) { |
413cd3d9 ON |
1508 | ret = 0; |
1509 | goto unlock; | |
1510 | } | |
ee18d64c DH |
1511 | |
1512 | /* the parent must have the same effective ownership and mustn't be | |
1513 | * SUID/SGID */ | |
9a56c2db EB |
1514 | if (!uid_eq(pcred->uid, mycred->euid) || |
1515 | !uid_eq(pcred->euid, mycred->euid) || | |
1516 | !uid_eq(pcred->suid, mycred->euid) || | |
1517 | !gid_eq(pcred->gid, mycred->egid) || | |
1518 | !gid_eq(pcred->egid, mycred->egid) || | |
1519 | !gid_eq(pcred->sgid, mycred->egid)) | |
413cd3d9 | 1520 | goto unlock; |
ee18d64c DH |
1521 | |
1522 | /* the keyrings must have the same UID */ | |
3a50597d | 1523 | if ((pcred->session_keyring && |
2a74dbb9 LT |
1524 | !uid_eq(pcred->session_keyring->uid, mycred->euid)) || |
1525 | !uid_eq(mycred->session_keyring->uid, mycred->euid)) | |
413cd3d9 | 1526 | goto unlock; |
ee18d64c | 1527 | |
413cd3d9 ON |
1528 | /* cancel an already pending keyring replacement */ |
1529 | oldwork = task_work_cancel(parent, key_change_session_keyring); | |
ee18d64c DH |
1530 | |
1531 | /* the replacement session keyring is applied just prior to userspace | |
1532 | * restarting */ | |
67d12145 | 1533 | ret = task_work_add(parent, newwork, true); |
413cd3d9 ON |
1534 | if (!ret) |
1535 | newwork = NULL; | |
1536 | unlock: | |
ee18d64c | 1537 | write_unlock_irq(&tasklist_lock); |
9d1ac65a | 1538 | rcu_read_unlock(); |
67d12145 AV |
1539 | if (oldwork) |
1540 | put_cred(container_of(oldwork, struct cred, rcu)); | |
1541 | if (newwork) | |
1542 | put_cred(cred); | |
ee18d64c DH |
1543 | return ret; |
1544 | ||
1545 | error_keyring: | |
1546 | key_ref_put(keyring_r); | |
1547 | return ret; | |
1548 | } | |
1549 | ||
1da177e4 | 1550 | /* |
973c9f4f | 1551 | * The key control system call |
1da177e4 | 1552 | */ |
938bb9f5 HC |
1553 | SYSCALL_DEFINE5(keyctl, int, option, unsigned long, arg2, unsigned long, arg3, |
1554 | unsigned long, arg4, unsigned long, arg5) | |
1da177e4 LT |
1555 | { |
1556 | switch (option) { | |
1557 | case KEYCTL_GET_KEYRING_ID: | |
1558 | return keyctl_get_keyring_ID((key_serial_t) arg2, | |
1559 | (int) arg3); | |
1560 | ||
1561 | case KEYCTL_JOIN_SESSION_KEYRING: | |
1562 | return keyctl_join_session_keyring((const char __user *) arg2); | |
1563 | ||
1564 | case KEYCTL_UPDATE: | |
1565 | return keyctl_update_key((key_serial_t) arg2, | |
1566 | (const void __user *) arg3, | |
1567 | (size_t) arg4); | |
1568 | ||
1569 | case KEYCTL_REVOKE: | |
1570 | return keyctl_revoke_key((key_serial_t) arg2); | |
1571 | ||
1572 | case KEYCTL_DESCRIBE: | |
1573 | return keyctl_describe_key((key_serial_t) arg2, | |
1574 | (char __user *) arg3, | |
1575 | (unsigned) arg4); | |
1576 | ||
1577 | case KEYCTL_CLEAR: | |
1578 | return keyctl_keyring_clear((key_serial_t) arg2); | |
1579 | ||
1580 | case KEYCTL_LINK: | |
1581 | return keyctl_keyring_link((key_serial_t) arg2, | |
1582 | (key_serial_t) arg3); | |
1583 | ||
1584 | case KEYCTL_UNLINK: | |
1585 | return keyctl_keyring_unlink((key_serial_t) arg2, | |
1586 | (key_serial_t) arg3); | |
1587 | ||
1588 | case KEYCTL_SEARCH: | |
1589 | return keyctl_keyring_search((key_serial_t) arg2, | |
1590 | (const char __user *) arg3, | |
1591 | (const char __user *) arg4, | |
1592 | (key_serial_t) arg5); | |
1593 | ||
1594 | case KEYCTL_READ: | |
1595 | return keyctl_read_key((key_serial_t) arg2, | |
1596 | (char __user *) arg3, | |
1597 | (size_t) arg4); | |
1598 | ||
1599 | case KEYCTL_CHOWN: | |
1600 | return keyctl_chown_key((key_serial_t) arg2, | |
1601 | (uid_t) arg3, | |
1602 | (gid_t) arg4); | |
1603 | ||
1604 | case KEYCTL_SETPERM: | |
1605 | return keyctl_setperm_key((key_serial_t) arg2, | |
1606 | (key_perm_t) arg3); | |
1607 | ||
1608 | case KEYCTL_INSTANTIATE: | |
1609 | return keyctl_instantiate_key((key_serial_t) arg2, | |
1610 | (const void __user *) arg3, | |
1611 | (size_t) arg4, | |
1612 | (key_serial_t) arg5); | |
1613 | ||
1614 | case KEYCTL_NEGATE: | |
1615 | return keyctl_negate_key((key_serial_t) arg2, | |
1616 | (unsigned) arg3, | |
1617 | (key_serial_t) arg4); | |
1618 | ||
3e30148c DH |
1619 | case KEYCTL_SET_REQKEY_KEYRING: |
1620 | return keyctl_set_reqkey_keyring(arg2); | |
1621 | ||
017679c4 DH |
1622 | case KEYCTL_SET_TIMEOUT: |
1623 | return keyctl_set_timeout((key_serial_t) arg2, | |
1624 | (unsigned) arg3); | |
1625 | ||
b5f545c8 DH |
1626 | case KEYCTL_ASSUME_AUTHORITY: |
1627 | return keyctl_assume_authority((key_serial_t) arg2); | |
1628 | ||
70a5bb72 DH |
1629 | case KEYCTL_GET_SECURITY: |
1630 | return keyctl_get_security((key_serial_t) arg2, | |
90bd49ab | 1631 | (char __user *) arg3, |
70a5bb72 DH |
1632 | (size_t) arg4); |
1633 | ||
ee18d64c DH |
1634 | case KEYCTL_SESSION_TO_PARENT: |
1635 | return keyctl_session_to_parent(); | |
1636 | ||
fdd1b945 DH |
1637 | case KEYCTL_REJECT: |
1638 | return keyctl_reject_key((key_serial_t) arg2, | |
1639 | (unsigned) arg3, | |
1640 | (unsigned) arg4, | |
1641 | (key_serial_t) arg5); | |
1642 | ||
ee009e4a DH |
1643 | case KEYCTL_INSTANTIATE_IOV: |
1644 | return keyctl_instantiate_key_iov( | |
1645 | (key_serial_t) arg2, | |
1646 | (const struct iovec __user *) arg3, | |
1647 | (unsigned) arg4, | |
1648 | (key_serial_t) arg5); | |
1649 | ||
fd75815f DH |
1650 | case KEYCTL_INVALIDATE: |
1651 | return keyctl_invalidate_key((key_serial_t) arg2); | |
1652 | ||
f36f8c75 DH |
1653 | case KEYCTL_GET_PERSISTENT: |
1654 | return keyctl_get_persistent((uid_t)arg2, (key_serial_t)arg3); | |
1655 | ||
1da177e4 LT |
1656 | default: |
1657 | return -EOPNOTSUPP; | |
1658 | } | |
a8b17ed0 | 1659 | } |