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 | ||
0cb409d9 DA |
29 | static int key_get_type_from_user(char *type, |
30 | const char __user *_type, | |
31 | unsigned len) | |
32 | { | |
33 | int ret; | |
34 | ||
35 | ret = strncpy_from_user(type, _type, len); | |
0cb409d9 | 36 | if (ret < 0) |
4303ef19 | 37 | return ret; |
0cb409d9 DA |
38 | if (ret == 0 || ret >= len) |
39 | return -EINVAL; | |
0cb409d9 DA |
40 | if (type[0] == '.') |
41 | return -EPERM; | |
0cb409d9 | 42 | type[len - 1] = '\0'; |
0cb409d9 DA |
43 | return 0; |
44 | } | |
45 | ||
1da177e4 | 46 | /* |
973c9f4f DH |
47 | * Extract the description of a new key from userspace and either add it as a |
48 | * new key to the specified keyring or update a matching key in that keyring. | |
49 | * | |
cf7f601c DH |
50 | * If the description is NULL or an empty string, the key type is asked to |
51 | * generate one from the payload. | |
52 | * | |
973c9f4f DH |
53 | * The keyring must be writable so that we can attach the key to it. |
54 | * | |
55 | * If successful, the new key's serial number is returned, otherwise an error | |
56 | * code is returned. | |
1da177e4 | 57 | */ |
1e7bfb21 HC |
58 | SYSCALL_DEFINE5(add_key, const char __user *, _type, |
59 | const char __user *, _description, | |
60 | const void __user *, _payload, | |
61 | size_t, plen, | |
62 | key_serial_t, ringid) | |
1da177e4 | 63 | { |
664cceb0 | 64 | key_ref_t keyring_ref, key_ref; |
1da177e4 LT |
65 | char type[32], *description; |
66 | void *payload; | |
0cb409d9 | 67 | long ret; |
38bbca6b | 68 | bool vm; |
1da177e4 LT |
69 | |
70 | ret = -EINVAL; | |
38bbca6b | 71 | if (plen > 1024 * 1024 - 1) |
1da177e4 LT |
72 | goto error; |
73 | ||
74 | /* draw all the data into kernel space */ | |
0cb409d9 | 75 | ret = key_get_type_from_user(type, _type, sizeof(type)); |
1da177e4 LT |
76 | if (ret < 0) |
77 | goto error; | |
1da177e4 | 78 | |
cf7f601c DH |
79 | description = NULL; |
80 | if (_description) { | |
81 | description = strndup_user(_description, PAGE_SIZE); | |
82 | if (IS_ERR(description)) { | |
83 | ret = PTR_ERR(description); | |
84 | goto error; | |
85 | } | |
86 | if (!*description) { | |
87 | kfree(description); | |
88 | description = NULL; | |
89 | } | |
0cb409d9 | 90 | } |
1da177e4 LT |
91 | |
92 | /* pull the payload in if one was supplied */ | |
93 | payload = NULL; | |
94 | ||
38bbca6b | 95 | vm = false; |
f862c943 | 96 | if (plen) { |
1da177e4 | 97 | ret = -ENOMEM; |
4f1c28d2 | 98 | payload = kmalloc(plen, GFP_KERNEL | __GFP_NOWARN); |
38bbca6b DH |
99 | if (!payload) { |
100 | if (plen <= PAGE_SIZE) | |
101 | goto error2; | |
102 | vm = true; | |
103 | payload = vmalloc(plen); | |
104 | if (!payload) | |
105 | goto error2; | |
106 | } | |
1da177e4 LT |
107 | |
108 | ret = -EFAULT; | |
109 | if (copy_from_user(payload, _payload, plen) != 0) | |
110 | goto error3; | |
111 | } | |
112 | ||
113 | /* find the target keyring (which must be writable) */ | |
5593122e | 114 | keyring_ref = lookup_user_key(ringid, KEY_LOOKUP_CREATE, KEY_WRITE); |
664cceb0 DH |
115 | if (IS_ERR(keyring_ref)) { |
116 | ret = PTR_ERR(keyring_ref); | |
1da177e4 LT |
117 | goto error3; |
118 | } | |
119 | ||
120 | /* create or update the requested key and add it to the target | |
121 | * keyring */ | |
664cceb0 | 122 | key_ref = key_create_or_update(keyring_ref, type, description, |
6b79ccb5 AR |
123 | payload, plen, KEY_PERM_UNDEF, |
124 | KEY_ALLOC_IN_QUOTA); | |
664cceb0 DH |
125 | if (!IS_ERR(key_ref)) { |
126 | ret = key_ref_to_ptr(key_ref)->serial; | |
127 | key_ref_put(key_ref); | |
1da177e4 LT |
128 | } |
129 | else { | |
664cceb0 | 130 | ret = PTR_ERR(key_ref); |
1da177e4 LT |
131 | } |
132 | ||
664cceb0 | 133 | key_ref_put(keyring_ref); |
1da177e4 | 134 | error3: |
38bbca6b DH |
135 | if (!vm) |
136 | kfree(payload); | |
137 | else | |
138 | vfree(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 */ |
0cb409d9 DA |
176 | description = strndup_user(_description, PAGE_SIZE); |
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 DH |
197 | dest_ref = lookup_user_key(destringid, KEY_LOOKUP_CREATE, |
198 | KEY_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 DH |
255 | lflags = create ? KEY_LOOKUP_CREATE : 0; |
256 | key_ref = lookup_user_key(id, lflags, KEY_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 | |
8e728d26 DH |
274 | * be skipped over. It is not permitted for userspace to create or join |
275 | * keyrings whose name begin with a dot. | |
973c9f4f DH |
276 | * |
277 | * If successful, the ID of the joined session keyring will be returned. | |
1da177e4 LT |
278 | */ |
279 | long keyctl_join_session_keyring(const char __user *_name) | |
280 | { | |
281 | char *name; | |
0cb409d9 | 282 | long ret; |
1da177e4 LT |
283 | |
284 | /* fetch the name from userspace */ | |
285 | name = NULL; | |
286 | if (_name) { | |
0cb409d9 DA |
287 | name = strndup_user(_name, PAGE_SIZE); |
288 | if (IS_ERR(name)) { | |
289 | ret = PTR_ERR(name); | |
1da177e4 | 290 | goto error; |
0cb409d9 | 291 | } |
8e728d26 DH |
292 | |
293 | ret = -EPERM; | |
294 | if (name[0] == '.') | |
295 | goto error_name; | |
1da177e4 LT |
296 | } |
297 | ||
298 | /* join the session */ | |
299 | ret = join_session_keyring(name); | |
8e728d26 | 300 | error_name: |
0d54ee1c | 301 | kfree(name); |
c5b60b5e | 302 | error: |
1da177e4 | 303 | return ret; |
a8b17ed0 | 304 | } |
1da177e4 | 305 | |
1da177e4 | 306 | /* |
973c9f4f DH |
307 | * Update a key's data payload from the given data. |
308 | * | |
309 | * The key must grant the caller Write permission and the key type must support | |
310 | * updating for this to work. A negative key can be positively instantiated | |
311 | * with this call. | |
312 | * | |
313 | * If successful, 0 will be returned. If the key type does not support | |
314 | * updating, then -EOPNOTSUPP will be returned. | |
1da177e4 LT |
315 | */ |
316 | long keyctl_update_key(key_serial_t id, | |
317 | const void __user *_payload, | |
318 | size_t plen) | |
319 | { | |
664cceb0 | 320 | key_ref_t key_ref; |
1da177e4 LT |
321 | void *payload; |
322 | long ret; | |
323 | ||
324 | ret = -EINVAL; | |
325 | if (plen > PAGE_SIZE) | |
326 | goto error; | |
327 | ||
328 | /* pull the payload in if one was supplied */ | |
329 | payload = NULL; | |
f862c943 | 330 | if (plen) { |
1da177e4 LT |
331 | ret = -ENOMEM; |
332 | payload = kmalloc(plen, GFP_KERNEL); | |
333 | if (!payload) | |
334 | goto error; | |
335 | ||
336 | ret = -EFAULT; | |
337 | if (copy_from_user(payload, _payload, plen) != 0) | |
338 | goto error2; | |
339 | } | |
340 | ||
341 | /* find the target key (which must be writable) */ | |
5593122e | 342 | key_ref = lookup_user_key(id, 0, KEY_WRITE); |
664cceb0 DH |
343 | if (IS_ERR(key_ref)) { |
344 | ret = PTR_ERR(key_ref); | |
1da177e4 LT |
345 | goto error2; |
346 | } | |
347 | ||
348 | /* update the key */ | |
664cceb0 | 349 | ret = key_update(key_ref, payload, plen); |
1da177e4 | 350 | |
664cceb0 | 351 | key_ref_put(key_ref); |
c5b60b5e | 352 | error2: |
1da177e4 | 353 | kfree(payload); |
c5b60b5e | 354 | error: |
1da177e4 | 355 | return ret; |
a8b17ed0 | 356 | } |
1da177e4 | 357 | |
1da177e4 | 358 | /* |
973c9f4f DH |
359 | * Revoke a key. |
360 | * | |
361 | * The key must be grant the caller Write or Setattr permission for this to | |
362 | * work. The key type should give up its quota claim when revoked. The key | |
363 | * and any links to the key will be automatically garbage collected after a | |
364 | * certain amount of time (/proc/sys/kernel/keys/gc_delay). | |
365 | * | |
366 | * If successful, 0 is returned. | |
1da177e4 LT |
367 | */ |
368 | long keyctl_revoke_key(key_serial_t id) | |
369 | { | |
664cceb0 | 370 | key_ref_t key_ref; |
1da177e4 LT |
371 | long ret; |
372 | ||
5593122e | 373 | key_ref = lookup_user_key(id, 0, KEY_WRITE); |
664cceb0 DH |
374 | if (IS_ERR(key_ref)) { |
375 | ret = PTR_ERR(key_ref); | |
0c2c9a3f DH |
376 | if (ret != -EACCES) |
377 | goto error; | |
378 | key_ref = lookup_user_key(id, 0, KEY_SETATTR); | |
379 | if (IS_ERR(key_ref)) { | |
380 | ret = PTR_ERR(key_ref); | |
381 | goto error; | |
382 | } | |
1da177e4 LT |
383 | } |
384 | ||
664cceb0 | 385 | key_revoke(key_ref_to_ptr(key_ref)); |
1da177e4 LT |
386 | ret = 0; |
387 | ||
664cceb0 | 388 | key_ref_put(key_ref); |
c5b60b5e | 389 | error: |
1260f801 | 390 | return ret; |
a8b17ed0 | 391 | } |
1da177e4 | 392 | |
fd75815f DH |
393 | /* |
394 | * Invalidate a key. | |
395 | * | |
396 | * The key must be grant the caller Invalidate permission for this to work. | |
397 | * The key and any links to the key will be automatically garbage collected | |
398 | * immediately. | |
399 | * | |
400 | * If successful, 0 is returned. | |
401 | */ | |
402 | long keyctl_invalidate_key(key_serial_t id) | |
403 | { | |
404 | key_ref_t key_ref; | |
405 | long ret; | |
406 | ||
407 | kenter("%d", id); | |
408 | ||
409 | key_ref = lookup_user_key(id, 0, KEY_SEARCH); | |
410 | if (IS_ERR(key_ref)) { | |
411 | ret = PTR_ERR(key_ref); | |
412 | goto error; | |
413 | } | |
414 | ||
415 | key_invalidate(key_ref_to_ptr(key_ref)); | |
416 | ret = 0; | |
417 | ||
418 | key_ref_put(key_ref); | |
419 | error: | |
420 | kleave(" = %ld", ret); | |
421 | return ret; | |
422 | } | |
423 | ||
1da177e4 | 424 | /* |
973c9f4f DH |
425 | * Clear the specified keyring, creating an empty process keyring if one of the |
426 | * special keyring IDs is used. | |
427 | * | |
428 | * The keyring must grant the caller Write permission for this to work. If | |
429 | * successful, 0 will be returned. | |
1da177e4 LT |
430 | */ |
431 | long keyctl_keyring_clear(key_serial_t ringid) | |
432 | { | |
664cceb0 | 433 | key_ref_t keyring_ref; |
1da177e4 LT |
434 | long ret; |
435 | ||
5593122e | 436 | keyring_ref = lookup_user_key(ringid, KEY_LOOKUP_CREATE, KEY_WRITE); |
664cceb0 DH |
437 | if (IS_ERR(keyring_ref)) { |
438 | ret = PTR_ERR(keyring_ref); | |
700920eb DH |
439 | |
440 | /* Root is permitted to invalidate certain special keyrings */ | |
441 | if (capable(CAP_SYS_ADMIN)) { | |
442 | keyring_ref = lookup_user_key(ringid, 0, 0); | |
443 | if (IS_ERR(keyring_ref)) | |
444 | goto error; | |
445 | if (test_bit(KEY_FLAG_ROOT_CAN_CLEAR, | |
446 | &key_ref_to_ptr(keyring_ref)->flags)) | |
447 | goto clear; | |
448 | goto error_put; | |
449 | } | |
450 | ||
1da177e4 LT |
451 | goto error; |
452 | } | |
453 | ||
700920eb | 454 | clear: |
664cceb0 | 455 | ret = keyring_clear(key_ref_to_ptr(keyring_ref)); |
700920eb | 456 | error_put: |
664cceb0 | 457 | key_ref_put(keyring_ref); |
c5b60b5e | 458 | error: |
1da177e4 | 459 | return ret; |
a8b17ed0 | 460 | } |
1da177e4 | 461 | |
1da177e4 | 462 | /* |
973c9f4f DH |
463 | * Create a link from a keyring to a key if there's no matching key in the |
464 | * keyring, otherwise replace the link to the matching key with a link to the | |
465 | * new key. | |
466 | * | |
467 | * The key must grant the caller Link permission and the the keyring must grant | |
468 | * the caller Write permission. Furthermore, if an additional link is created, | |
469 | * the keyring's quota will be extended. | |
470 | * | |
471 | * If successful, 0 will be returned. | |
1da177e4 LT |
472 | */ |
473 | long keyctl_keyring_link(key_serial_t id, key_serial_t ringid) | |
474 | { | |
664cceb0 | 475 | key_ref_t keyring_ref, key_ref; |
1da177e4 LT |
476 | long ret; |
477 | ||
5593122e | 478 | keyring_ref = lookup_user_key(ringid, KEY_LOOKUP_CREATE, KEY_WRITE); |
664cceb0 DH |
479 | if (IS_ERR(keyring_ref)) { |
480 | ret = PTR_ERR(keyring_ref); | |
1da177e4 LT |
481 | goto error; |
482 | } | |
483 | ||
5593122e | 484 | key_ref = lookup_user_key(id, KEY_LOOKUP_CREATE, KEY_LINK); |
664cceb0 DH |
485 | if (IS_ERR(key_ref)) { |
486 | ret = PTR_ERR(key_ref); | |
1da177e4 LT |
487 | goto error2; |
488 | } | |
489 | ||
664cceb0 | 490 | ret = key_link(key_ref_to_ptr(keyring_ref), key_ref_to_ptr(key_ref)); |
1da177e4 | 491 | |
664cceb0 | 492 | key_ref_put(key_ref); |
c5b60b5e | 493 | error2: |
664cceb0 | 494 | key_ref_put(keyring_ref); |
c5b60b5e | 495 | error: |
1da177e4 | 496 | return ret; |
a8b17ed0 | 497 | } |
1da177e4 | 498 | |
1da177e4 | 499 | /* |
973c9f4f DH |
500 | * Unlink a key from a keyring. |
501 | * | |
502 | * The keyring must grant the caller Write permission for this to work; the key | |
503 | * itself need not grant the caller anything. If the last link to a key is | |
504 | * removed then that key will be scheduled for destruction. | |
505 | * | |
506 | * If successful, 0 will be returned. | |
1da177e4 LT |
507 | */ |
508 | long keyctl_keyring_unlink(key_serial_t id, key_serial_t ringid) | |
509 | { | |
664cceb0 | 510 | key_ref_t keyring_ref, key_ref; |
1da177e4 LT |
511 | long ret; |
512 | ||
5593122e | 513 | keyring_ref = lookup_user_key(ringid, 0, KEY_WRITE); |
664cceb0 DH |
514 | if (IS_ERR(keyring_ref)) { |
515 | ret = PTR_ERR(keyring_ref); | |
1da177e4 LT |
516 | goto error; |
517 | } | |
518 | ||
5593122e | 519 | key_ref = lookup_user_key(id, KEY_LOOKUP_FOR_UNLINK, 0); |
664cceb0 DH |
520 | if (IS_ERR(key_ref)) { |
521 | ret = PTR_ERR(key_ref); | |
1da177e4 LT |
522 | goto error2; |
523 | } | |
524 | ||
664cceb0 | 525 | ret = key_unlink(key_ref_to_ptr(keyring_ref), key_ref_to_ptr(key_ref)); |
1da177e4 | 526 | |
664cceb0 | 527 | key_ref_put(key_ref); |
c5b60b5e | 528 | error2: |
664cceb0 | 529 | key_ref_put(keyring_ref); |
c5b60b5e | 530 | error: |
1da177e4 | 531 | return ret; |
a8b17ed0 | 532 | } |
1da177e4 | 533 | |
1da177e4 | 534 | /* |
973c9f4f DH |
535 | * Return a description of a key to userspace. |
536 | * | |
537 | * The key must grant the caller View permission for this to work. | |
538 | * | |
539 | * If there's a buffer, we place up to buflen bytes of data into it formatted | |
540 | * in the following way: | |
541 | * | |
1da177e4 | 542 | * type;uid;gid;perm;description<NUL> |
973c9f4f DH |
543 | * |
544 | * If successful, we return the amount of description available, irrespective | |
545 | * of how much we may have copied into the buffer. | |
1da177e4 LT |
546 | */ |
547 | long keyctl_describe_key(key_serial_t keyid, | |
548 | char __user *buffer, | |
549 | size_t buflen) | |
550 | { | |
3e30148c | 551 | struct key *key, *instkey; |
664cceb0 | 552 | key_ref_t key_ref; |
1da177e4 LT |
553 | char *tmpbuf; |
554 | long ret; | |
555 | ||
5593122e | 556 | key_ref = lookup_user_key(keyid, KEY_LOOKUP_PARTIAL, KEY_VIEW); |
664cceb0 | 557 | if (IS_ERR(key_ref)) { |
3e30148c DH |
558 | /* viewing a key under construction is permitted if we have the |
559 | * authorisation token handy */ | |
664cceb0 | 560 | if (PTR_ERR(key_ref) == -EACCES) { |
3e30148c DH |
561 | instkey = key_get_instantiation_authkey(keyid); |
562 | if (!IS_ERR(instkey)) { | |
563 | key_put(instkey); | |
8bbf4976 | 564 | key_ref = lookup_user_key(keyid, |
5593122e DH |
565 | KEY_LOOKUP_PARTIAL, |
566 | 0); | |
664cceb0 | 567 | if (!IS_ERR(key_ref)) |
3e30148c DH |
568 | goto okay; |
569 | } | |
570 | } | |
571 | ||
664cceb0 | 572 | ret = PTR_ERR(key_ref); |
1da177e4 LT |
573 | goto error; |
574 | } | |
575 | ||
3e30148c | 576 | okay: |
1da177e4 LT |
577 | /* calculate how much description we're going to return */ |
578 | ret = -ENOMEM; | |
579 | tmpbuf = kmalloc(PAGE_SIZE, GFP_KERNEL); | |
580 | if (!tmpbuf) | |
581 | goto error2; | |
582 | ||
664cceb0 DH |
583 | key = key_ref_to_ptr(key_ref); |
584 | ||
1da177e4 | 585 | ret = snprintf(tmpbuf, PAGE_SIZE - 1, |
664cceb0 | 586 | "%s;%d;%d;%08x;%s", |
94fd8405 | 587 | key->type->name, |
9a56c2db EB |
588 | from_kuid_munged(current_user_ns(), key->uid), |
589 | from_kgid_munged(current_user_ns(), key->gid), | |
94fd8405 DH |
590 | key->perm, |
591 | key->description ?: ""); | |
1da177e4 LT |
592 | |
593 | /* include a NUL char at the end of the data */ | |
594 | if (ret > PAGE_SIZE - 1) | |
595 | ret = PAGE_SIZE - 1; | |
596 | tmpbuf[ret] = 0; | |
597 | ret++; | |
598 | ||
599 | /* consider returning the data */ | |
600 | if (buffer && buflen > 0) { | |
601 | if (buflen > ret) | |
602 | buflen = ret; | |
603 | ||
604 | if (copy_to_user(buffer, tmpbuf, buflen) != 0) | |
605 | ret = -EFAULT; | |
606 | } | |
607 | ||
608 | kfree(tmpbuf); | |
c5b60b5e | 609 | error2: |
664cceb0 | 610 | key_ref_put(key_ref); |
c5b60b5e | 611 | error: |
1da177e4 | 612 | return ret; |
a8b17ed0 | 613 | } |
1da177e4 | 614 | |
1da177e4 | 615 | /* |
973c9f4f DH |
616 | * Search the specified keyring and any keyrings it links to for a matching |
617 | * key. Only keyrings that grant the caller Search permission will be searched | |
618 | * (this includes the starting keyring). Only keys with Search permission can | |
619 | * be found. | |
620 | * | |
621 | * If successful, the found key will be linked to the destination keyring if | |
622 | * supplied and the key has Link permission, and the found key ID will be | |
623 | * returned. | |
1da177e4 LT |
624 | */ |
625 | long keyctl_keyring_search(key_serial_t ringid, | |
626 | const char __user *_type, | |
627 | const char __user *_description, | |
628 | key_serial_t destringid) | |
629 | { | |
630 | struct key_type *ktype; | |
664cceb0 | 631 | key_ref_t keyring_ref, key_ref, dest_ref; |
1da177e4 | 632 | char type[32], *description; |
0cb409d9 | 633 | long ret; |
1da177e4 LT |
634 | |
635 | /* pull the type and description into kernel space */ | |
0cb409d9 | 636 | ret = key_get_type_from_user(type, _type, sizeof(type)); |
1da177e4 LT |
637 | if (ret < 0) |
638 | goto error; | |
1da177e4 | 639 | |
0cb409d9 DA |
640 | description = strndup_user(_description, PAGE_SIZE); |
641 | if (IS_ERR(description)) { | |
642 | ret = PTR_ERR(description); | |
1da177e4 | 643 | goto error; |
0cb409d9 | 644 | } |
1da177e4 LT |
645 | |
646 | /* get the keyring at which to begin the search */ | |
5593122e | 647 | keyring_ref = lookup_user_key(ringid, 0, KEY_SEARCH); |
664cceb0 DH |
648 | if (IS_ERR(keyring_ref)) { |
649 | ret = PTR_ERR(keyring_ref); | |
1da177e4 LT |
650 | goto error2; |
651 | } | |
652 | ||
653 | /* get the destination keyring if specified */ | |
664cceb0 | 654 | dest_ref = NULL; |
1da177e4 | 655 | if (destringid) { |
5593122e DH |
656 | dest_ref = lookup_user_key(destringid, KEY_LOOKUP_CREATE, |
657 | KEY_WRITE); | |
664cceb0 DH |
658 | if (IS_ERR(dest_ref)) { |
659 | ret = PTR_ERR(dest_ref); | |
1da177e4 LT |
660 | goto error3; |
661 | } | |
662 | } | |
663 | ||
664 | /* find the key type */ | |
665 | ktype = key_type_lookup(type); | |
666 | if (IS_ERR(ktype)) { | |
667 | ret = PTR_ERR(ktype); | |
668 | goto error4; | |
669 | } | |
670 | ||
671 | /* do the search */ | |
664cceb0 DH |
672 | key_ref = keyring_search(keyring_ref, ktype, description); |
673 | if (IS_ERR(key_ref)) { | |
674 | ret = PTR_ERR(key_ref); | |
1da177e4 LT |
675 | |
676 | /* treat lack or presence of a negative key the same */ | |
677 | if (ret == -EAGAIN) | |
678 | ret = -ENOKEY; | |
679 | goto error5; | |
680 | } | |
681 | ||
682 | /* link the resulting key to the destination keyring if we can */ | |
664cceb0 | 683 | if (dest_ref) { |
29db9190 DH |
684 | ret = key_permission(key_ref, KEY_LINK); |
685 | if (ret < 0) | |
1da177e4 LT |
686 | goto error6; |
687 | ||
664cceb0 | 688 | ret = key_link(key_ref_to_ptr(dest_ref), key_ref_to_ptr(key_ref)); |
1da177e4 LT |
689 | if (ret < 0) |
690 | goto error6; | |
691 | } | |
692 | ||
664cceb0 | 693 | ret = key_ref_to_ptr(key_ref)->serial; |
1da177e4 | 694 | |
c5b60b5e | 695 | error6: |
664cceb0 | 696 | key_ref_put(key_ref); |
c5b60b5e | 697 | error5: |
1da177e4 | 698 | key_type_put(ktype); |
c5b60b5e | 699 | error4: |
664cceb0 | 700 | key_ref_put(dest_ref); |
c5b60b5e | 701 | error3: |
664cceb0 | 702 | key_ref_put(keyring_ref); |
c5b60b5e | 703 | error2: |
1da177e4 | 704 | kfree(description); |
c5b60b5e | 705 | error: |
1da177e4 | 706 | return ret; |
a8b17ed0 | 707 | } |
1da177e4 | 708 | |
1da177e4 | 709 | /* |
973c9f4f DH |
710 | * Read a key's payload. |
711 | * | |
712 | * The key must either grant the caller Read permission, or it must grant the | |
713 | * caller Search permission when searched for from the process keyrings. | |
714 | * | |
715 | * If successful, we place up to buflen bytes of data into the buffer, if one | |
716 | * is provided, and return the amount of data that is available in the key, | |
717 | * irrespective of how much we copied into the buffer. | |
1da177e4 LT |
718 | */ |
719 | long keyctl_read_key(key_serial_t keyid, char __user *buffer, size_t buflen) | |
720 | { | |
664cceb0 DH |
721 | struct key *key; |
722 | key_ref_t key_ref; | |
1da177e4 LT |
723 | long ret; |
724 | ||
725 | /* find the key first */ | |
5593122e | 726 | key_ref = lookup_user_key(keyid, 0, 0); |
664cceb0 DH |
727 | if (IS_ERR(key_ref)) { |
728 | ret = -ENOKEY; | |
729 | goto error; | |
1da177e4 LT |
730 | } |
731 | ||
664cceb0 DH |
732 | key = key_ref_to_ptr(key_ref); |
733 | ||
734 | /* see if we can read it directly */ | |
29db9190 DH |
735 | ret = key_permission(key_ref, KEY_READ); |
736 | if (ret == 0) | |
664cceb0 | 737 | goto can_read_key; |
29db9190 DH |
738 | if (ret != -EACCES) |
739 | goto error; | |
664cceb0 DH |
740 | |
741 | /* we can't; see if it's searchable from this process's keyrings | |
742 | * - we automatically take account of the fact that it may be | |
743 | * dangling off an instantiation key | |
744 | */ | |
745 | if (!is_key_possessed(key_ref)) { | |
746 | ret = -EACCES; | |
747 | goto error2; | |
748 | } | |
1da177e4 LT |
749 | |
750 | /* the key is probably readable - now try to read it */ | |
c5b60b5e | 751 | can_read_key: |
afd8f582 DH |
752 | ret = -EOPNOTSUPP; |
753 | if (key->type->read) { | |
754 | /* Read the data with the semaphore held (since we might sleep) | |
755 | * to protect against the key being updated or revoked. | |
756 | */ | |
757 | down_read(&key->sem); | |
758 | ret = key_validate(key); | |
759 | if (ret == 0) | |
1da177e4 | 760 | ret = key->type->read(key, buffer, buflen); |
afd8f582 | 761 | up_read(&key->sem); |
1da177e4 LT |
762 | } |
763 | ||
c5b60b5e | 764 | error2: |
1da177e4 | 765 | key_put(key); |
c5b60b5e | 766 | error: |
1da177e4 | 767 | return ret; |
a8b17ed0 | 768 | } |
1da177e4 | 769 | |
1da177e4 | 770 | /* |
973c9f4f DH |
771 | * Change the ownership of a key |
772 | * | |
773 | * The key must grant the caller Setattr permission for this to work, though | |
774 | * the key need not be fully instantiated yet. For the UID to be changed, or | |
775 | * for the GID to be changed to a group the caller is not a member of, the | |
776 | * caller must have sysadmin capability. If either uid or gid is -1 then that | |
777 | * attribute is not changed. | |
778 | * | |
779 | * If the UID is to be changed, the new user must have sufficient quota to | |
780 | * accept the key. The quota deduction will be removed from the old user to | |
781 | * the new user should the attribute be changed. | |
782 | * | |
783 | * If successful, 0 will be returned. | |
1da177e4 | 784 | */ |
9a56c2db | 785 | long keyctl_chown_key(key_serial_t id, uid_t user, gid_t group) |
1da177e4 | 786 | { |
5801649d | 787 | struct key_user *newowner, *zapowner = NULL; |
1da177e4 | 788 | struct key *key; |
664cceb0 | 789 | key_ref_t key_ref; |
1da177e4 | 790 | long ret; |
9a56c2db EB |
791 | kuid_t uid; |
792 | kgid_t gid; | |
793 | ||
794 | uid = make_kuid(current_user_ns(), user); | |
795 | gid = make_kgid(current_user_ns(), group); | |
796 | ret = -EINVAL; | |
797 | if ((user != (uid_t) -1) && !uid_valid(uid)) | |
798 | goto error; | |
799 | if ((group != (gid_t) -1) && !gid_valid(gid)) | |
800 | goto error; | |
1da177e4 LT |
801 | |
802 | ret = 0; | |
9a56c2db | 803 | if (user == (uid_t) -1 && group == (gid_t) -1) |
1da177e4 LT |
804 | goto error; |
805 | ||
5593122e DH |
806 | key_ref = lookup_user_key(id, KEY_LOOKUP_CREATE | KEY_LOOKUP_PARTIAL, |
807 | KEY_SETATTR); | |
664cceb0 DH |
808 | if (IS_ERR(key_ref)) { |
809 | ret = PTR_ERR(key_ref); | |
1da177e4 LT |
810 | goto error; |
811 | } | |
812 | ||
664cceb0 DH |
813 | key = key_ref_to_ptr(key_ref); |
814 | ||
1da177e4 LT |
815 | /* make the changes with the locks held to prevent chown/chown races */ |
816 | ret = -EACCES; | |
817 | down_write(&key->sem); | |
1da177e4 LT |
818 | |
819 | if (!capable(CAP_SYS_ADMIN)) { | |
820 | /* only the sysadmin can chown a key to some other UID */ | |
9a56c2db | 821 | if (user != (uid_t) -1 && !uid_eq(key->uid, uid)) |
5801649d | 822 | goto error_put; |
1da177e4 LT |
823 | |
824 | /* only the sysadmin can set the key's GID to a group other | |
825 | * than one of those that the current process subscribes to */ | |
9a56c2db | 826 | if (group != (gid_t) -1 && !gid_eq(gid, key->gid) && !in_group_p(gid)) |
5801649d | 827 | goto error_put; |
1da177e4 LT |
828 | } |
829 | ||
5801649d | 830 | /* change the UID */ |
9a56c2db | 831 | if (user != (uid_t) -1 && !uid_eq(uid, key->uid)) { |
5801649d | 832 | ret = -ENOMEM; |
9a56c2db | 833 | newowner = key_user_lookup(uid); |
5801649d FT |
834 | if (!newowner) |
835 | goto error_put; | |
836 | ||
837 | /* transfer the quota burden to the new user */ | |
838 | if (test_bit(KEY_FLAG_IN_QUOTA, &key->flags)) { | |
9a56c2db | 839 | unsigned maxkeys = uid_eq(uid, GLOBAL_ROOT_UID) ? |
0b77f5bf | 840 | key_quota_root_maxkeys : key_quota_maxkeys; |
9a56c2db | 841 | unsigned maxbytes = uid_eq(uid, GLOBAL_ROOT_UID) ? |
0b77f5bf DH |
842 | key_quota_root_maxbytes : key_quota_maxbytes; |
843 | ||
5801649d | 844 | spin_lock(&newowner->lock); |
0b77f5bf DH |
845 | if (newowner->qnkeys + 1 >= maxkeys || |
846 | newowner->qnbytes + key->quotalen >= maxbytes || | |
847 | newowner->qnbytes + key->quotalen < | |
848 | newowner->qnbytes) | |
5801649d FT |
849 | goto quota_overrun; |
850 | ||
851 | newowner->qnkeys++; | |
852 | newowner->qnbytes += key->quotalen; | |
853 | spin_unlock(&newowner->lock); | |
854 | ||
855 | spin_lock(&key->user->lock); | |
856 | key->user->qnkeys--; | |
857 | key->user->qnbytes -= key->quotalen; | |
858 | spin_unlock(&key->user->lock); | |
859 | } | |
860 | ||
861 | atomic_dec(&key->user->nkeys); | |
862 | atomic_inc(&newowner->nkeys); | |
863 | ||
864 | if (test_bit(KEY_FLAG_INSTANTIATED, &key->flags)) { | |
865 | atomic_dec(&key->user->nikeys); | |
866 | atomic_inc(&newowner->nikeys); | |
867 | } | |
868 | ||
869 | zapowner = key->user; | |
870 | key->user = newowner; | |
871 | key->uid = uid; | |
1da177e4 LT |
872 | } |
873 | ||
874 | /* change the GID */ | |
9a56c2db | 875 | if (group != (gid_t) -1) |
1da177e4 LT |
876 | key->gid = gid; |
877 | ||
878 | ret = 0; | |
879 | ||
5801649d | 880 | error_put: |
1da177e4 LT |
881 | up_write(&key->sem); |
882 | key_put(key); | |
5801649d FT |
883 | if (zapowner) |
884 | key_user_put(zapowner); | |
885 | error: | |
1da177e4 LT |
886 | return ret; |
887 | ||
5801649d FT |
888 | quota_overrun: |
889 | spin_unlock(&newowner->lock); | |
890 | zapowner = newowner; | |
891 | ret = -EDQUOT; | |
892 | goto error_put; | |
a8b17ed0 | 893 | } |
5801649d | 894 | |
1da177e4 | 895 | /* |
973c9f4f DH |
896 | * Change the permission mask on a key. |
897 | * | |
898 | * The key must grant the caller Setattr permission for this to work, though | |
899 | * the key need not be fully instantiated yet. If the caller does not have | |
900 | * sysadmin capability, it may only change the permission on keys that it owns. | |
1da177e4 LT |
901 | */ |
902 | long keyctl_setperm_key(key_serial_t id, key_perm_t perm) | |
903 | { | |
904 | struct key *key; | |
664cceb0 | 905 | key_ref_t key_ref; |
1da177e4 LT |
906 | long ret; |
907 | ||
908 | ret = -EINVAL; | |
664cceb0 | 909 | if (perm & ~(KEY_POS_ALL | KEY_USR_ALL | KEY_GRP_ALL | KEY_OTH_ALL)) |
1da177e4 LT |
910 | goto error; |
911 | ||
5593122e DH |
912 | key_ref = lookup_user_key(id, KEY_LOOKUP_CREATE | KEY_LOOKUP_PARTIAL, |
913 | KEY_SETATTR); | |
664cceb0 DH |
914 | if (IS_ERR(key_ref)) { |
915 | ret = PTR_ERR(key_ref); | |
1da177e4 LT |
916 | goto error; |
917 | } | |
918 | ||
664cceb0 DH |
919 | key = key_ref_to_ptr(key_ref); |
920 | ||
76d8aeab | 921 | /* make the changes with the locks held to prevent chown/chmod races */ |
1da177e4 LT |
922 | ret = -EACCES; |
923 | down_write(&key->sem); | |
1da177e4 | 924 | |
76d8aeab | 925 | /* if we're not the sysadmin, we can only change a key that we own */ |
9a56c2db | 926 | if (capable(CAP_SYS_ADMIN) || uid_eq(key->uid, current_fsuid())) { |
76d8aeab DH |
927 | key->perm = perm; |
928 | ret = 0; | |
929 | } | |
1da177e4 | 930 | |
1da177e4 LT |
931 | up_write(&key->sem); |
932 | key_put(key); | |
76d8aeab | 933 | error: |
1da177e4 | 934 | return ret; |
a8b17ed0 | 935 | } |
1da177e4 | 936 | |
8bbf4976 | 937 | /* |
973c9f4f DH |
938 | * Get the destination keyring for instantiation and check that the caller has |
939 | * Write permission on it. | |
8bbf4976 DH |
940 | */ |
941 | static long get_instantiation_keyring(key_serial_t ringid, | |
942 | struct request_key_auth *rka, | |
943 | struct key **_dest_keyring) | |
944 | { | |
945 | key_ref_t dkref; | |
946 | ||
eca1bf5b DH |
947 | *_dest_keyring = NULL; |
948 | ||
8bbf4976 | 949 | /* just return a NULL pointer if we weren't asked to make a link */ |
eca1bf5b | 950 | if (ringid == 0) |
8bbf4976 | 951 | return 0; |
8bbf4976 DH |
952 | |
953 | /* if a specific keyring is nominated by ID, then use that */ | |
954 | if (ringid > 0) { | |
5593122e | 955 | dkref = lookup_user_key(ringid, KEY_LOOKUP_CREATE, KEY_WRITE); |
8bbf4976 DH |
956 | if (IS_ERR(dkref)) |
957 | return PTR_ERR(dkref); | |
958 | *_dest_keyring = key_ref_to_ptr(dkref); | |
959 | return 0; | |
960 | } | |
961 | ||
962 | if (ringid == KEY_SPEC_REQKEY_AUTH_KEY) | |
963 | return -EINVAL; | |
964 | ||
965 | /* otherwise specify the destination keyring recorded in the | |
966 | * authorisation key (any KEY_SPEC_*_KEYRING) */ | |
967 | if (ringid >= KEY_SPEC_REQUESTOR_KEYRING) { | |
21279cfa | 968 | *_dest_keyring = key_get(rka->dest_keyring); |
8bbf4976 DH |
969 | return 0; |
970 | } | |
971 | ||
972 | return -ENOKEY; | |
973 | } | |
974 | ||
d84f4f99 | 975 | /* |
973c9f4f | 976 | * Change the request_key authorisation key on the current process. |
d84f4f99 DH |
977 | */ |
978 | static int keyctl_change_reqkey_auth(struct key *key) | |
979 | { | |
980 | struct cred *new; | |
981 | ||
982 | new = prepare_creds(); | |
983 | if (!new) | |
984 | return -ENOMEM; | |
985 | ||
986 | key_put(new->request_key_auth); | |
987 | new->request_key_auth = key_get(key); | |
988 | ||
989 | return commit_creds(new); | |
990 | } | |
991 | ||
ee009e4a DH |
992 | /* |
993 | * Copy the iovec data from userspace | |
994 | */ | |
995 | static long copy_from_user_iovec(void *buffer, const struct iovec *iov, | |
996 | unsigned ioc) | |
997 | { | |
998 | for (; ioc > 0; ioc--) { | |
999 | if (copy_from_user(buffer, iov->iov_base, iov->iov_len) != 0) | |
1000 | return -EFAULT; | |
1001 | buffer += iov->iov_len; | |
1002 | iov++; | |
1003 | } | |
1004 | return 0; | |
1005 | } | |
1006 | ||
1da177e4 | 1007 | /* |
973c9f4f DH |
1008 | * Instantiate a key with the specified payload and link the key into the |
1009 | * destination keyring if one is given. | |
1010 | * | |
1011 | * The caller must have the appropriate instantiation permit set for this to | |
1012 | * work (see keyctl_assume_authority). No other permissions are required. | |
1013 | * | |
1014 | * If successful, 0 will be returned. | |
1da177e4 | 1015 | */ |
ee009e4a DH |
1016 | long keyctl_instantiate_key_common(key_serial_t id, |
1017 | const struct iovec *payload_iov, | |
1018 | unsigned ioc, | |
1019 | size_t plen, | |
1020 | key_serial_t ringid) | |
1da177e4 | 1021 | { |
d84f4f99 | 1022 | const struct cred *cred = current_cred(); |
3e30148c | 1023 | struct request_key_auth *rka; |
8bbf4976 | 1024 | struct key *instkey, *dest_keyring; |
1da177e4 LT |
1025 | void *payload; |
1026 | long ret; | |
38bbca6b | 1027 | bool vm = false; |
1da177e4 | 1028 | |
d84f4f99 DH |
1029 | kenter("%d,,%zu,%d", id, plen, ringid); |
1030 | ||
1da177e4 | 1031 | ret = -EINVAL; |
38bbca6b | 1032 | if (plen > 1024 * 1024 - 1) |
1da177e4 LT |
1033 | goto error; |
1034 | ||
b5f545c8 DH |
1035 | /* the appropriate instantiation authorisation key must have been |
1036 | * assumed before calling this */ | |
1037 | ret = -EPERM; | |
d84f4f99 | 1038 | instkey = cred->request_key_auth; |
b5f545c8 DH |
1039 | if (!instkey) |
1040 | goto error; | |
1041 | ||
1042 | rka = instkey->payload.data; | |
1043 | if (rka->target_key->serial != id) | |
1044 | goto error; | |
1045 | ||
1da177e4 LT |
1046 | /* pull the payload in if one was supplied */ |
1047 | payload = NULL; | |
1048 | ||
ee009e4a | 1049 | if (payload_iov) { |
1da177e4 LT |
1050 | ret = -ENOMEM; |
1051 | payload = kmalloc(plen, GFP_KERNEL); | |
38bbca6b DH |
1052 | if (!payload) { |
1053 | if (plen <= PAGE_SIZE) | |
1054 | goto error; | |
1055 | vm = true; | |
1056 | payload = vmalloc(plen); | |
1057 | if (!payload) | |
1058 | goto error; | |
1059 | } | |
1da177e4 | 1060 | |
ee009e4a DH |
1061 | ret = copy_from_user_iovec(payload, payload_iov, ioc); |
1062 | if (ret < 0) | |
1da177e4 LT |
1063 | goto error2; |
1064 | } | |
1065 | ||
3e30148c DH |
1066 | /* find the destination keyring amongst those belonging to the |
1067 | * requesting task */ | |
8bbf4976 DH |
1068 | ret = get_instantiation_keyring(ringid, rka, &dest_keyring); |
1069 | if (ret < 0) | |
1070 | goto error2; | |
1da177e4 LT |
1071 | |
1072 | /* instantiate the key and link it into a keyring */ | |
3e30148c | 1073 | ret = key_instantiate_and_link(rka->target_key, payload, plen, |
8bbf4976 | 1074 | dest_keyring, instkey); |
1da177e4 | 1075 | |
8bbf4976 | 1076 | key_put(dest_keyring); |
b5f545c8 DH |
1077 | |
1078 | /* discard the assumed authority if it's just been disabled by | |
1079 | * instantiation of the key */ | |
d84f4f99 DH |
1080 | if (ret == 0) |
1081 | keyctl_change_reqkey_auth(NULL); | |
b5f545c8 DH |
1082 | |
1083 | error2: | |
38bbca6b DH |
1084 | if (!vm) |
1085 | kfree(payload); | |
1086 | else | |
1087 | vfree(payload); | |
b5f545c8 | 1088 | error: |
1da177e4 | 1089 | return ret; |
a8b17ed0 | 1090 | } |
1da177e4 | 1091 | |
ee009e4a DH |
1092 | /* |
1093 | * Instantiate a key with the specified payload and link the key into the | |
1094 | * destination keyring if one is given. | |
1095 | * | |
1096 | * The caller must have the appropriate instantiation permit set for this to | |
1097 | * work (see keyctl_assume_authority). No other permissions are required. | |
1098 | * | |
1099 | * If successful, 0 will be returned. | |
1100 | */ | |
1101 | long keyctl_instantiate_key(key_serial_t id, | |
1102 | const void __user *_payload, | |
1103 | size_t plen, | |
1104 | key_serial_t ringid) | |
1105 | { | |
1106 | if (_payload && plen) { | |
1107 | struct iovec iov[1] = { | |
1108 | [0].iov_base = (void __user *)_payload, | |
1109 | [0].iov_len = plen | |
1110 | }; | |
1111 | ||
1112 | return keyctl_instantiate_key_common(id, iov, 1, plen, ringid); | |
1113 | } | |
1114 | ||
1115 | return keyctl_instantiate_key_common(id, NULL, 0, 0, ringid); | |
1116 | } | |
1117 | ||
1118 | /* | |
1119 | * Instantiate a key with the specified multipart payload and link the key into | |
1120 | * the destination keyring if one is given. | |
1121 | * | |
1122 | * The caller must have the appropriate instantiation permit set for this to | |
1123 | * work (see keyctl_assume_authority). No other permissions are required. | |
1124 | * | |
1125 | * If successful, 0 will be returned. | |
1126 | */ | |
1127 | long keyctl_instantiate_key_iov(key_serial_t id, | |
1128 | const struct iovec __user *_payload_iov, | |
1129 | unsigned ioc, | |
1130 | key_serial_t ringid) | |
1131 | { | |
1132 | struct iovec iovstack[UIO_FASTIOV], *iov = iovstack; | |
1133 | long ret; | |
1134 | ||
423b9788 | 1135 | if (!_payload_iov || !ioc) |
ee009e4a DH |
1136 | goto no_payload; |
1137 | ||
1138 | ret = rw_copy_check_uvector(WRITE, _payload_iov, ioc, | |
ac34ebb3 | 1139 | ARRAY_SIZE(iovstack), iovstack, &iov); |
ee009e4a | 1140 | if (ret < 0) |
a84a9219 | 1141 | goto err; |
ee009e4a DH |
1142 | if (ret == 0) |
1143 | goto no_payload_free; | |
1144 | ||
1145 | ret = keyctl_instantiate_key_common(id, iov, ioc, ret, ringid); | |
a84a9219 | 1146 | err: |
ee009e4a DH |
1147 | if (iov != iovstack) |
1148 | kfree(iov); | |
1149 | return ret; | |
1150 | ||
1151 | no_payload_free: | |
1152 | if (iov != iovstack) | |
1153 | kfree(iov); | |
1154 | no_payload: | |
1155 | return keyctl_instantiate_key_common(id, NULL, 0, 0, ringid); | |
1156 | } | |
1157 | ||
1da177e4 | 1158 | /* |
973c9f4f DH |
1159 | * Negatively instantiate the key with the given timeout (in seconds) and link |
1160 | * the key into the destination keyring if one is given. | |
1161 | * | |
1162 | * The caller must have the appropriate instantiation permit set for this to | |
1163 | * work (see keyctl_assume_authority). No other permissions are required. | |
1164 | * | |
1165 | * The key and any links to the key will be automatically garbage collected | |
1166 | * after the timeout expires. | |
1167 | * | |
1168 | * Negative keys are used to rate limit repeated request_key() calls by causing | |
1169 | * them to return -ENOKEY until the negative key expires. | |
1170 | * | |
1171 | * If successful, 0 will be returned. | |
1da177e4 LT |
1172 | */ |
1173 | long keyctl_negate_key(key_serial_t id, unsigned timeout, key_serial_t ringid) | |
fdd1b945 DH |
1174 | { |
1175 | return keyctl_reject_key(id, timeout, ENOKEY, ringid); | |
1176 | } | |
1177 | ||
1178 | /* | |
1179 | * Negatively instantiate the key with the given timeout (in seconds) and error | |
1180 | * code and link the key into the destination keyring if one is given. | |
1181 | * | |
1182 | * The caller must have the appropriate instantiation permit set for this to | |
1183 | * work (see keyctl_assume_authority). No other permissions are required. | |
1184 | * | |
1185 | * The key and any links to the key will be automatically garbage collected | |
1186 | * after the timeout expires. | |
1187 | * | |
1188 | * Negative keys are used to rate limit repeated request_key() calls by causing | |
1189 | * them to return the specified error code until the negative key expires. | |
1190 | * | |
1191 | * If successful, 0 will be returned. | |
1192 | */ | |
1193 | long keyctl_reject_key(key_serial_t id, unsigned timeout, unsigned error, | |
1194 | key_serial_t ringid) | |
1da177e4 | 1195 | { |
d84f4f99 | 1196 | const struct cred *cred = current_cred(); |
3e30148c | 1197 | struct request_key_auth *rka; |
8bbf4976 | 1198 | struct key *instkey, *dest_keyring; |
1da177e4 LT |
1199 | long ret; |
1200 | ||
fdd1b945 DH |
1201 | kenter("%d,%u,%u,%d", id, timeout, error, ringid); |
1202 | ||
1203 | /* must be a valid error code and mustn't be a kernel special */ | |
1204 | if (error <= 0 || | |
1205 | error >= MAX_ERRNO || | |
1206 | error == ERESTARTSYS || | |
1207 | error == ERESTARTNOINTR || | |
1208 | error == ERESTARTNOHAND || | |
1209 | error == ERESTART_RESTARTBLOCK) | |
1210 | return -EINVAL; | |
d84f4f99 | 1211 | |
b5f545c8 DH |
1212 | /* the appropriate instantiation authorisation key must have been |
1213 | * assumed before calling this */ | |
1214 | ret = -EPERM; | |
d84f4f99 | 1215 | instkey = cred->request_key_auth; |
b5f545c8 | 1216 | if (!instkey) |
1da177e4 | 1217 | goto error; |
1da177e4 | 1218 | |
3e30148c | 1219 | rka = instkey->payload.data; |
b5f545c8 DH |
1220 | if (rka->target_key->serial != id) |
1221 | goto error; | |
3e30148c | 1222 | |
1da177e4 LT |
1223 | /* find the destination keyring if present (which must also be |
1224 | * writable) */ | |
8bbf4976 DH |
1225 | ret = get_instantiation_keyring(ringid, rka, &dest_keyring); |
1226 | if (ret < 0) | |
1227 | goto error; | |
1da177e4 LT |
1228 | |
1229 | /* instantiate the key and link it into a keyring */ | |
fdd1b945 | 1230 | ret = key_reject_and_link(rka->target_key, timeout, error, |
8bbf4976 | 1231 | dest_keyring, instkey); |
1da177e4 | 1232 | |
8bbf4976 | 1233 | key_put(dest_keyring); |
b5f545c8 DH |
1234 | |
1235 | /* discard the assumed authority if it's just been disabled by | |
1236 | * instantiation of the key */ | |
d84f4f99 DH |
1237 | if (ret == 0) |
1238 | keyctl_change_reqkey_auth(NULL); | |
b5f545c8 DH |
1239 | |
1240 | error: | |
1da177e4 | 1241 | return ret; |
a8b17ed0 | 1242 | } |
1da177e4 | 1243 | |
3e30148c | 1244 | /* |
973c9f4f DH |
1245 | * Read or set the default keyring in which request_key() will cache keys and |
1246 | * return the old setting. | |
1247 | * | |
d19182e2 EB |
1248 | * If a thread or process keyring is specified then it will be created if it |
1249 | * doesn't yet exist. The old setting will be returned if successful. | |
3e30148c DH |
1250 | */ |
1251 | long keyctl_set_reqkey_keyring(int reqkey_defl) | |
1252 | { | |
d84f4f99 DH |
1253 | struct cred *new; |
1254 | int ret, old_setting; | |
1255 | ||
1256 | old_setting = current_cred_xxx(jit_keyring); | |
1257 | ||
1258 | if (reqkey_defl == KEY_REQKEY_DEFL_NO_CHANGE) | |
1259 | return old_setting; | |
1260 | ||
1261 | new = prepare_creds(); | |
1262 | if (!new) | |
1263 | return -ENOMEM; | |
3e30148c DH |
1264 | |
1265 | switch (reqkey_defl) { | |
1266 | case KEY_REQKEY_DEFL_THREAD_KEYRING: | |
d84f4f99 | 1267 | ret = install_thread_keyring_to_cred(new); |
3e30148c | 1268 | if (ret < 0) |
d84f4f99 | 1269 | goto error; |
3e30148c DH |
1270 | goto set; |
1271 | ||
1272 | case KEY_REQKEY_DEFL_PROCESS_KEYRING: | |
d84f4f99 | 1273 | ret = install_process_keyring_to_cred(new); |
d19182e2 EB |
1274 | if (ret < 0) |
1275 | goto error; | |
d84f4f99 | 1276 | goto set; |
3e30148c DH |
1277 | |
1278 | case KEY_REQKEY_DEFL_DEFAULT: | |
1279 | case KEY_REQKEY_DEFL_SESSION_KEYRING: | |
1280 | case KEY_REQKEY_DEFL_USER_KEYRING: | |
1281 | case KEY_REQKEY_DEFL_USER_SESSION_KEYRING: | |
d84f4f99 DH |
1282 | case KEY_REQKEY_DEFL_REQUESTOR_KEYRING: |
1283 | goto set; | |
3e30148c DH |
1284 | |
1285 | case KEY_REQKEY_DEFL_NO_CHANGE: | |
3e30148c DH |
1286 | case KEY_REQKEY_DEFL_GROUP_KEYRING: |
1287 | default: | |
d84f4f99 DH |
1288 | ret = -EINVAL; |
1289 | goto error; | |
3e30148c DH |
1290 | } |
1291 | ||
d84f4f99 DH |
1292 | set: |
1293 | new->jit_keyring = reqkey_defl; | |
1294 | commit_creds(new); | |
1295 | return old_setting; | |
1296 | error: | |
1297 | abort_creds(new); | |
4303ef19 | 1298 | return ret; |
a8b17ed0 | 1299 | } |
d84f4f99 | 1300 | |
017679c4 | 1301 | /* |
973c9f4f DH |
1302 | * Set or clear the timeout on a key. |
1303 | * | |
1304 | * Either the key must grant the caller Setattr permission or else the caller | |
1305 | * must hold an instantiation authorisation token for the key. | |
1306 | * | |
1307 | * The timeout is either 0 to clear the timeout, or a number of seconds from | |
1308 | * the current time. The key and any links to the key will be automatically | |
1309 | * garbage collected after the timeout expires. | |
1310 | * | |
1311 | * If successful, 0 is returned. | |
017679c4 DH |
1312 | */ |
1313 | long keyctl_set_timeout(key_serial_t id, unsigned timeout) | |
1314 | { | |
9156235b | 1315 | struct key *key, *instkey; |
017679c4 | 1316 | key_ref_t key_ref; |
017679c4 DH |
1317 | long ret; |
1318 | ||
5593122e DH |
1319 | key_ref = lookup_user_key(id, KEY_LOOKUP_CREATE | KEY_LOOKUP_PARTIAL, |
1320 | KEY_SETATTR); | |
017679c4 | 1321 | if (IS_ERR(key_ref)) { |
9156235b DH |
1322 | /* setting the timeout on a key under construction is permitted |
1323 | * if we have the authorisation token handy */ | |
1324 | if (PTR_ERR(key_ref) == -EACCES) { | |
1325 | instkey = key_get_instantiation_authkey(id); | |
1326 | if (!IS_ERR(instkey)) { | |
1327 | key_put(instkey); | |
1328 | key_ref = lookup_user_key(id, | |
1329 | KEY_LOOKUP_PARTIAL, | |
1330 | 0); | |
1331 | if (!IS_ERR(key_ref)) | |
1332 | goto okay; | |
1333 | } | |
1334 | } | |
1335 | ||
017679c4 DH |
1336 | ret = PTR_ERR(key_ref); |
1337 | goto error; | |
1338 | } | |
1339 | ||
9156235b | 1340 | okay: |
017679c4 | 1341 | key = key_ref_to_ptr(key_ref); |
59e6b9c1 | 1342 | key_set_timeout(key, timeout); |
017679c4 DH |
1343 | key_put(key); |
1344 | ||
1345 | ret = 0; | |
1346 | error: | |
1347 | return ret; | |
a8b17ed0 | 1348 | } |
017679c4 | 1349 | |
b5f545c8 | 1350 | /* |
973c9f4f DH |
1351 | * Assume (or clear) the authority to instantiate the specified key. |
1352 | * | |
1353 | * This sets the authoritative token currently in force for key instantiation. | |
1354 | * This must be done for a key to be instantiated. It has the effect of making | |
1355 | * available all the keys from the caller of the request_key() that created a | |
1356 | * key to request_key() calls made by the caller of this function. | |
1357 | * | |
1358 | * The caller must have the instantiation key in their process keyrings with a | |
1359 | * Search permission grant available to the caller. | |
1360 | * | |
1361 | * If the ID given is 0, then the setting will be cleared and 0 returned. | |
1362 | * | |
1363 | * If the ID given has a matching an authorisation key, then that key will be | |
1364 | * set and its ID will be returned. The authorisation key can be read to get | |
1365 | * the callout information passed to request_key(). | |
b5f545c8 DH |
1366 | */ |
1367 | long keyctl_assume_authority(key_serial_t id) | |
1368 | { | |
1369 | struct key *authkey; | |
1370 | long ret; | |
1371 | ||
1372 | /* special key IDs aren't permitted */ | |
1373 | ret = -EINVAL; | |
1374 | if (id < 0) | |
1375 | goto error; | |
1376 | ||
1377 | /* we divest ourselves of authority if given an ID of 0 */ | |
1378 | if (id == 0) { | |
d84f4f99 | 1379 | ret = keyctl_change_reqkey_auth(NULL); |
b5f545c8 DH |
1380 | goto error; |
1381 | } | |
1382 | ||
1383 | /* attempt to assume the authority temporarily granted to us whilst we | |
1384 | * instantiate the specified key | |
1385 | * - the authorisation key must be in the current task's keyrings | |
1386 | * somewhere | |
1387 | */ | |
1388 | authkey = key_get_instantiation_authkey(id); | |
1389 | if (IS_ERR(authkey)) { | |
1390 | ret = PTR_ERR(authkey); | |
1391 | goto error; | |
1392 | } | |
1393 | ||
d84f4f99 DH |
1394 | ret = keyctl_change_reqkey_auth(authkey); |
1395 | if (ret < 0) | |
1396 | goto error; | |
1397 | key_put(authkey); | |
b5f545c8 | 1398 | |
d84f4f99 | 1399 | ret = authkey->serial; |
b5f545c8 DH |
1400 | error: |
1401 | return ret; | |
a8b17ed0 | 1402 | } |
b5f545c8 | 1403 | |
70a5bb72 | 1404 | /* |
973c9f4f DH |
1405 | * Get a key's the LSM security label. |
1406 | * | |
1407 | * The key must grant the caller View permission for this to work. | |
1408 | * | |
1409 | * If there's a buffer, then up to buflen bytes of data will be placed into it. | |
1410 | * | |
1411 | * If successful, the amount of information available will be returned, | |
1412 | * irrespective of how much was copied (including the terminal NUL). | |
70a5bb72 DH |
1413 | */ |
1414 | long keyctl_get_security(key_serial_t keyid, | |
1415 | char __user *buffer, | |
1416 | size_t buflen) | |
1417 | { | |
1418 | struct key *key, *instkey; | |
1419 | key_ref_t key_ref; | |
1420 | char *context; | |
1421 | long ret; | |
1422 | ||
5593122e | 1423 | key_ref = lookup_user_key(keyid, KEY_LOOKUP_PARTIAL, KEY_VIEW); |
70a5bb72 DH |
1424 | if (IS_ERR(key_ref)) { |
1425 | if (PTR_ERR(key_ref) != -EACCES) | |
1426 | return PTR_ERR(key_ref); | |
1427 | ||
1428 | /* viewing a key under construction is also permitted if we | |
1429 | * have the authorisation token handy */ | |
1430 | instkey = key_get_instantiation_authkey(keyid); | |
1431 | if (IS_ERR(instkey)) | |
fa1cc7b5 | 1432 | return PTR_ERR(instkey); |
70a5bb72 DH |
1433 | key_put(instkey); |
1434 | ||
5593122e | 1435 | key_ref = lookup_user_key(keyid, KEY_LOOKUP_PARTIAL, 0); |
70a5bb72 DH |
1436 | if (IS_ERR(key_ref)) |
1437 | return PTR_ERR(key_ref); | |
1438 | } | |
1439 | ||
1440 | key = key_ref_to_ptr(key_ref); | |
1441 | ret = security_key_getsecurity(key, &context); | |
1442 | if (ret == 0) { | |
1443 | /* if no information was returned, give userspace an empty | |
1444 | * string */ | |
1445 | ret = 1; | |
1446 | if (buffer && buflen > 0 && | |
1447 | copy_to_user(buffer, "", 1) != 0) | |
1448 | ret = -EFAULT; | |
1449 | } else if (ret > 0) { | |
1450 | /* return as much data as there's room for */ | |
1451 | if (buffer && buflen > 0) { | |
1452 | if (buflen > ret) | |
1453 | buflen = ret; | |
1454 | ||
1455 | if (copy_to_user(buffer, context, buflen) != 0) | |
1456 | ret = -EFAULT; | |
1457 | } | |
1458 | ||
1459 | kfree(context); | |
1460 | } | |
1461 | ||
1462 | key_ref_put(key_ref); | |
1463 | return ret; | |
1464 | } | |
1465 | ||
ee18d64c | 1466 | /* |
973c9f4f DH |
1467 | * Attempt to install the calling process's session keyring on the process's |
1468 | * parent process. | |
1469 | * | |
1470 | * The keyring must exist and must grant the caller LINK permission, and the | |
1471 | * parent process must be single-threaded and must have the same effective | |
1472 | * ownership as this process and mustn't be SUID/SGID. | |
1473 | * | |
1474 | * The keyring will be emplaced on the parent when it next resumes userspace. | |
1475 | * | |
1476 | * If successful, 0 will be returned. | |
ee18d64c DH |
1477 | */ |
1478 | long keyctl_session_to_parent(void) | |
1479 | { | |
1480 | struct task_struct *me, *parent; | |
1481 | const struct cred *mycred, *pcred; | |
67d12145 | 1482 | struct callback_head *newwork, *oldwork; |
ee18d64c | 1483 | key_ref_t keyring_r; |
413cd3d9 | 1484 | struct cred *cred; |
ee18d64c DH |
1485 | int ret; |
1486 | ||
1487 | keyring_r = lookup_user_key(KEY_SPEC_SESSION_KEYRING, 0, KEY_LINK); | |
1488 | if (IS_ERR(keyring_r)) | |
1489 | return PTR_ERR(keyring_r); | |
1490 | ||
413cd3d9 | 1491 | ret = -ENOMEM; |
413cd3d9 | 1492 | |
ee18d64c DH |
1493 | /* our parent is going to need a new cred struct, a new tgcred struct |
1494 | * and new security data, so we allocate them here to prevent ENOMEM in | |
1495 | * our parent */ | |
ee18d64c DH |
1496 | cred = cred_alloc_blank(); |
1497 | if (!cred) | |
67d12145 AV |
1498 | goto error_keyring; |
1499 | newwork = &cred->rcu; | |
ee18d64c | 1500 | |
3a50597d DH |
1501 | cred->session_keyring = key_ref_to_ptr(keyring_r); |
1502 | keyring_r = NULL; | |
67d12145 | 1503 | init_task_work(newwork, key_change_session_keyring); |
ee18d64c DH |
1504 | |
1505 | me = current; | |
9d1ac65a | 1506 | rcu_read_lock(); |
ee18d64c DH |
1507 | write_lock_irq(&tasklist_lock); |
1508 | ||
ee18d64c | 1509 | ret = -EPERM; |
413cd3d9 ON |
1510 | oldwork = NULL; |
1511 | parent = me->real_parent; | |
ee18d64c DH |
1512 | |
1513 | /* the parent mustn't be init and mustn't be a kernel thread */ | |
1514 | if (parent->pid <= 1 || !parent->mm) | |
413cd3d9 | 1515 | goto unlock; |
ee18d64c DH |
1516 | |
1517 | /* the parent must be single threaded */ | |
dd98acf7 | 1518 | if (!thread_group_empty(parent)) |
413cd3d9 | 1519 | goto unlock; |
ee18d64c DH |
1520 | |
1521 | /* the parent and the child must have different session keyrings or | |
1522 | * there's no point */ | |
1523 | mycred = current_cred(); | |
1524 | pcred = __task_cred(parent); | |
1525 | if (mycred == pcred || | |
3a50597d | 1526 | mycred->session_keyring == pcred->session_keyring) { |
413cd3d9 ON |
1527 | ret = 0; |
1528 | goto unlock; | |
1529 | } | |
ee18d64c DH |
1530 | |
1531 | /* the parent must have the same effective ownership and mustn't be | |
1532 | * SUID/SGID */ | |
9a56c2db EB |
1533 | if (!uid_eq(pcred->uid, mycred->euid) || |
1534 | !uid_eq(pcred->euid, mycred->euid) || | |
1535 | !uid_eq(pcred->suid, mycred->euid) || | |
1536 | !gid_eq(pcred->gid, mycred->egid) || | |
1537 | !gid_eq(pcred->egid, mycred->egid) || | |
1538 | !gid_eq(pcred->sgid, mycred->egid)) | |
413cd3d9 | 1539 | goto unlock; |
ee18d64c DH |
1540 | |
1541 | /* the keyrings must have the same UID */ | |
3a50597d | 1542 | if ((pcred->session_keyring && |
2a74dbb9 LT |
1543 | !uid_eq(pcred->session_keyring->uid, mycred->euid)) || |
1544 | !uid_eq(mycred->session_keyring->uid, mycred->euid)) | |
413cd3d9 | 1545 | goto unlock; |
ee18d64c | 1546 | |
413cd3d9 ON |
1547 | /* cancel an already pending keyring replacement */ |
1548 | oldwork = task_work_cancel(parent, key_change_session_keyring); | |
ee18d64c DH |
1549 | |
1550 | /* the replacement session keyring is applied just prior to userspace | |
1551 | * restarting */ | |
67d12145 | 1552 | ret = task_work_add(parent, newwork, true); |
413cd3d9 ON |
1553 | if (!ret) |
1554 | newwork = NULL; | |
1555 | unlock: | |
ee18d64c | 1556 | write_unlock_irq(&tasklist_lock); |
9d1ac65a | 1557 | rcu_read_unlock(); |
67d12145 AV |
1558 | if (oldwork) |
1559 | put_cred(container_of(oldwork, struct cred, rcu)); | |
1560 | if (newwork) | |
1561 | put_cred(cred); | |
ee18d64c DH |
1562 | return ret; |
1563 | ||
1564 | error_keyring: | |
1565 | key_ref_put(keyring_r); | |
1566 | return ret; | |
1567 | } | |
1568 | ||
1da177e4 | 1569 | /* |
973c9f4f | 1570 | * The key control system call |
1da177e4 | 1571 | */ |
938bb9f5 HC |
1572 | SYSCALL_DEFINE5(keyctl, int, option, unsigned long, arg2, unsigned long, arg3, |
1573 | unsigned long, arg4, unsigned long, arg5) | |
1da177e4 LT |
1574 | { |
1575 | switch (option) { | |
1576 | case KEYCTL_GET_KEYRING_ID: | |
1577 | return keyctl_get_keyring_ID((key_serial_t) arg2, | |
1578 | (int) arg3); | |
1579 | ||
1580 | case KEYCTL_JOIN_SESSION_KEYRING: | |
1581 | return keyctl_join_session_keyring((const char __user *) arg2); | |
1582 | ||
1583 | case KEYCTL_UPDATE: | |
1584 | return keyctl_update_key((key_serial_t) arg2, | |
1585 | (const void __user *) arg3, | |
1586 | (size_t) arg4); | |
1587 | ||
1588 | case KEYCTL_REVOKE: | |
1589 | return keyctl_revoke_key((key_serial_t) arg2); | |
1590 | ||
1591 | case KEYCTL_DESCRIBE: | |
1592 | return keyctl_describe_key((key_serial_t) arg2, | |
1593 | (char __user *) arg3, | |
1594 | (unsigned) arg4); | |
1595 | ||
1596 | case KEYCTL_CLEAR: | |
1597 | return keyctl_keyring_clear((key_serial_t) arg2); | |
1598 | ||
1599 | case KEYCTL_LINK: | |
1600 | return keyctl_keyring_link((key_serial_t) arg2, | |
1601 | (key_serial_t) arg3); | |
1602 | ||
1603 | case KEYCTL_UNLINK: | |
1604 | return keyctl_keyring_unlink((key_serial_t) arg2, | |
1605 | (key_serial_t) arg3); | |
1606 | ||
1607 | case KEYCTL_SEARCH: | |
1608 | return keyctl_keyring_search((key_serial_t) arg2, | |
1609 | (const char __user *) arg3, | |
1610 | (const char __user *) arg4, | |
1611 | (key_serial_t) arg5); | |
1612 | ||
1613 | case KEYCTL_READ: | |
1614 | return keyctl_read_key((key_serial_t) arg2, | |
1615 | (char __user *) arg3, | |
1616 | (size_t) arg4); | |
1617 | ||
1618 | case KEYCTL_CHOWN: | |
1619 | return keyctl_chown_key((key_serial_t) arg2, | |
1620 | (uid_t) arg3, | |
1621 | (gid_t) arg4); | |
1622 | ||
1623 | case KEYCTL_SETPERM: | |
1624 | return keyctl_setperm_key((key_serial_t) arg2, | |
1625 | (key_perm_t) arg3); | |
1626 | ||
1627 | case KEYCTL_INSTANTIATE: | |
1628 | return keyctl_instantiate_key((key_serial_t) arg2, | |
1629 | (const void __user *) arg3, | |
1630 | (size_t) arg4, | |
1631 | (key_serial_t) arg5); | |
1632 | ||
1633 | case KEYCTL_NEGATE: | |
1634 | return keyctl_negate_key((key_serial_t) arg2, | |
1635 | (unsigned) arg3, | |
1636 | (key_serial_t) arg4); | |
1637 | ||
3e30148c DH |
1638 | case KEYCTL_SET_REQKEY_KEYRING: |
1639 | return keyctl_set_reqkey_keyring(arg2); | |
1640 | ||
017679c4 DH |
1641 | case KEYCTL_SET_TIMEOUT: |
1642 | return keyctl_set_timeout((key_serial_t) arg2, | |
1643 | (unsigned) arg3); | |
1644 | ||
b5f545c8 DH |
1645 | case KEYCTL_ASSUME_AUTHORITY: |
1646 | return keyctl_assume_authority((key_serial_t) arg2); | |
1647 | ||
70a5bb72 DH |
1648 | case KEYCTL_GET_SECURITY: |
1649 | return keyctl_get_security((key_serial_t) arg2, | |
90bd49ab | 1650 | (char __user *) arg3, |
70a5bb72 DH |
1651 | (size_t) arg4); |
1652 | ||
ee18d64c DH |
1653 | case KEYCTL_SESSION_TO_PARENT: |
1654 | return keyctl_session_to_parent(); | |
1655 | ||
fdd1b945 DH |
1656 | case KEYCTL_REJECT: |
1657 | return keyctl_reject_key((key_serial_t) arg2, | |
1658 | (unsigned) arg3, | |
1659 | (unsigned) arg4, | |
1660 | (key_serial_t) arg5); | |
1661 | ||
ee009e4a DH |
1662 | case KEYCTL_INSTANTIATE_IOV: |
1663 | return keyctl_instantiate_key_iov( | |
1664 | (key_serial_t) arg2, | |
1665 | (const struct iovec __user *) arg3, | |
1666 | (unsigned) arg4, | |
1667 | (key_serial_t) arg5); | |
1668 | ||
fd75815f DH |
1669 | case KEYCTL_INVALIDATE: |
1670 | return keyctl_invalidate_key((key_serial_t) arg2); | |
1671 | ||
1da177e4 LT |
1672 | default: |
1673 | return -EOPNOTSUPP; | |
1674 | } | |
a8b17ed0 | 1675 | } |