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> |
1da177e4 LT |
25 | #include <asm/uaccess.h> |
26 | #include "internal.h" | |
27 | ||
0cb409d9 DA |
28 | static int key_get_type_from_user(char *type, |
29 | const char __user *_type, | |
30 | unsigned len) | |
31 | { | |
32 | int ret; | |
33 | ||
34 | ret = strncpy_from_user(type, _type, len); | |
0cb409d9 | 35 | if (ret < 0) |
4303ef19 | 36 | return ret; |
0cb409d9 DA |
37 | if (ret == 0 || ret >= len) |
38 | return -EINVAL; | |
0cb409d9 DA |
39 | if (type[0] == '.') |
40 | return -EPERM; | |
0cb409d9 | 41 | type[len - 1] = '\0'; |
0cb409d9 DA |
42 | return 0; |
43 | } | |
44 | ||
1da177e4 | 45 | /* |
973c9f4f DH |
46 | * Extract the description of a new key from userspace and either add it as a |
47 | * new key to the specified keyring or update a matching key in that keyring. | |
48 | * | |
49 | * The keyring must be writable so that we can attach the key to it. | |
50 | * | |
51 | * If successful, the new key's serial number is returned, otherwise an error | |
52 | * code is returned. | |
1da177e4 | 53 | */ |
1e7bfb21 HC |
54 | SYSCALL_DEFINE5(add_key, const char __user *, _type, |
55 | const char __user *, _description, | |
56 | const void __user *, _payload, | |
57 | size_t, plen, | |
58 | key_serial_t, ringid) | |
1da177e4 | 59 | { |
664cceb0 | 60 | key_ref_t keyring_ref, key_ref; |
1da177e4 LT |
61 | char type[32], *description; |
62 | void *payload; | |
0cb409d9 | 63 | long ret; |
38bbca6b | 64 | bool vm; |
1da177e4 LT |
65 | |
66 | ret = -EINVAL; | |
38bbca6b | 67 | if (plen > 1024 * 1024 - 1) |
1da177e4 LT |
68 | goto error; |
69 | ||
70 | /* draw all the data into kernel space */ | |
0cb409d9 | 71 | ret = key_get_type_from_user(type, _type, sizeof(type)); |
1da177e4 LT |
72 | if (ret < 0) |
73 | goto error; | |
1da177e4 | 74 | |
0cb409d9 DA |
75 | description = strndup_user(_description, PAGE_SIZE); |
76 | if (IS_ERR(description)) { | |
77 | ret = PTR_ERR(description); | |
1da177e4 | 78 | goto error; |
0cb409d9 | 79 | } |
1da177e4 LT |
80 | |
81 | /* pull the payload in if one was supplied */ | |
82 | payload = NULL; | |
83 | ||
38bbca6b | 84 | vm = false; |
1da177e4 LT |
85 | if (_payload) { |
86 | ret = -ENOMEM; | |
87 | payload = kmalloc(plen, GFP_KERNEL); | |
38bbca6b DH |
88 | if (!payload) { |
89 | if (plen <= PAGE_SIZE) | |
90 | goto error2; | |
91 | vm = true; | |
92 | payload = vmalloc(plen); | |
93 | if (!payload) | |
94 | goto error2; | |
95 | } | |
1da177e4 LT |
96 | |
97 | ret = -EFAULT; | |
98 | if (copy_from_user(payload, _payload, plen) != 0) | |
99 | goto error3; | |
100 | } | |
101 | ||
102 | /* find the target keyring (which must be writable) */ | |
5593122e | 103 | keyring_ref = lookup_user_key(ringid, KEY_LOOKUP_CREATE, KEY_WRITE); |
664cceb0 DH |
104 | if (IS_ERR(keyring_ref)) { |
105 | ret = PTR_ERR(keyring_ref); | |
1da177e4 LT |
106 | goto error3; |
107 | } | |
108 | ||
109 | /* create or update the requested key and add it to the target | |
110 | * keyring */ | |
664cceb0 | 111 | key_ref = key_create_or_update(keyring_ref, type, description, |
6b79ccb5 AR |
112 | payload, plen, KEY_PERM_UNDEF, |
113 | KEY_ALLOC_IN_QUOTA); | |
664cceb0 DH |
114 | if (!IS_ERR(key_ref)) { |
115 | ret = key_ref_to_ptr(key_ref)->serial; | |
116 | key_ref_put(key_ref); | |
1da177e4 LT |
117 | } |
118 | else { | |
664cceb0 | 119 | ret = PTR_ERR(key_ref); |
1da177e4 LT |
120 | } |
121 | ||
664cceb0 | 122 | key_ref_put(keyring_ref); |
1da177e4 | 123 | error3: |
38bbca6b DH |
124 | if (!vm) |
125 | kfree(payload); | |
126 | else | |
127 | vfree(payload); | |
1da177e4 LT |
128 | error2: |
129 | kfree(description); | |
130 | error: | |
131 | return ret; | |
a8b17ed0 | 132 | } |
1da177e4 | 133 | |
1da177e4 | 134 | /* |
973c9f4f DH |
135 | * Search the process keyrings and keyring trees linked from those for a |
136 | * matching key. Keyrings must have appropriate Search permission to be | |
137 | * searched. | |
138 | * | |
139 | * If a key is found, it will be attached to the destination keyring if there's | |
140 | * one specified and the serial number of the key will be returned. | |
141 | * | |
142 | * If no key is found, /sbin/request-key will be invoked if _callout_info is | |
143 | * non-NULL in an attempt to create a key. The _callout_info string will be | |
144 | * passed to /sbin/request-key to aid with completing the request. If the | |
145 | * _callout_info string is "" then it will be changed to "-". | |
1da177e4 | 146 | */ |
1e7bfb21 HC |
147 | SYSCALL_DEFINE4(request_key, const char __user *, _type, |
148 | const char __user *, _description, | |
149 | const char __user *, _callout_info, | |
150 | key_serial_t, destringid) | |
1da177e4 LT |
151 | { |
152 | struct key_type *ktype; | |
664cceb0 DH |
153 | struct key *key; |
154 | key_ref_t dest_ref; | |
4a38e122 | 155 | size_t callout_len; |
1da177e4 | 156 | char type[32], *description, *callout_info; |
0cb409d9 | 157 | long ret; |
1da177e4 LT |
158 | |
159 | /* pull the type into kernel space */ | |
0cb409d9 | 160 | ret = key_get_type_from_user(type, _type, sizeof(type)); |
1da177e4 LT |
161 | if (ret < 0) |
162 | goto error; | |
1260f801 | 163 | |
1da177e4 | 164 | /* pull the description into kernel space */ |
0cb409d9 DA |
165 | description = strndup_user(_description, PAGE_SIZE); |
166 | if (IS_ERR(description)) { | |
167 | ret = PTR_ERR(description); | |
1da177e4 | 168 | goto error; |
0cb409d9 | 169 | } |
1da177e4 LT |
170 | |
171 | /* pull the callout info into kernel space */ | |
172 | callout_info = NULL; | |
4a38e122 | 173 | callout_len = 0; |
1da177e4 | 174 | if (_callout_info) { |
0cb409d9 DA |
175 | callout_info = strndup_user(_callout_info, PAGE_SIZE); |
176 | if (IS_ERR(callout_info)) { | |
177 | ret = PTR_ERR(callout_info); | |
1da177e4 | 178 | goto error2; |
0cb409d9 | 179 | } |
4a38e122 | 180 | callout_len = strlen(callout_info); |
1da177e4 LT |
181 | } |
182 | ||
183 | /* get the destination keyring if specified */ | |
664cceb0 | 184 | dest_ref = NULL; |
1da177e4 | 185 | if (destringid) { |
5593122e DH |
186 | dest_ref = lookup_user_key(destringid, KEY_LOOKUP_CREATE, |
187 | KEY_WRITE); | |
664cceb0 DH |
188 | if (IS_ERR(dest_ref)) { |
189 | ret = PTR_ERR(dest_ref); | |
1da177e4 LT |
190 | goto error3; |
191 | } | |
192 | } | |
193 | ||
194 | /* find the key type */ | |
195 | ktype = key_type_lookup(type); | |
196 | if (IS_ERR(ktype)) { | |
197 | ret = PTR_ERR(ktype); | |
198 | goto error4; | |
199 | } | |
200 | ||
201 | /* do the search */ | |
4a38e122 DH |
202 | key = request_key_and_link(ktype, description, callout_info, |
203 | callout_len, NULL, key_ref_to_ptr(dest_ref), | |
7e047ef5 | 204 | KEY_ALLOC_IN_QUOTA); |
1da177e4 LT |
205 | if (IS_ERR(key)) { |
206 | ret = PTR_ERR(key); | |
207 | goto error5; | |
208 | } | |
209 | ||
4aab1e89 DH |
210 | /* wait for the key to finish being constructed */ |
211 | ret = wait_for_key_construction(key, 1); | |
212 | if (ret < 0) | |
213 | goto error6; | |
214 | ||
1da177e4 LT |
215 | ret = key->serial; |
216 | ||
4aab1e89 | 217 | error6: |
3e30148c | 218 | key_put(key); |
c5b60b5e | 219 | error5: |
1da177e4 | 220 | key_type_put(ktype); |
c5b60b5e | 221 | error4: |
664cceb0 | 222 | key_ref_put(dest_ref); |
c5b60b5e | 223 | error3: |
1da177e4 | 224 | kfree(callout_info); |
c5b60b5e | 225 | error2: |
1da177e4 | 226 | kfree(description); |
c5b60b5e | 227 | error: |
1da177e4 | 228 | return ret; |
a8b17ed0 | 229 | } |
1da177e4 | 230 | |
1da177e4 | 231 | /* |
973c9f4f DH |
232 | * Get the ID of the specified process keyring. |
233 | * | |
234 | * The requested keyring must have search permission to be found. | |
235 | * | |
236 | * If successful, the ID of the requested keyring will be returned. | |
1da177e4 LT |
237 | */ |
238 | long keyctl_get_keyring_ID(key_serial_t id, int create) | |
239 | { | |
664cceb0 | 240 | key_ref_t key_ref; |
5593122e | 241 | unsigned long lflags; |
1da177e4 LT |
242 | long ret; |
243 | ||
5593122e DH |
244 | lflags = create ? KEY_LOOKUP_CREATE : 0; |
245 | key_ref = lookup_user_key(id, lflags, KEY_SEARCH); | |
664cceb0 DH |
246 | if (IS_ERR(key_ref)) { |
247 | ret = PTR_ERR(key_ref); | |
1da177e4 LT |
248 | goto error; |
249 | } | |
250 | ||
664cceb0 DH |
251 | ret = key_ref_to_ptr(key_ref)->serial; |
252 | key_ref_put(key_ref); | |
c5b60b5e | 253 | error: |
1da177e4 | 254 | return ret; |
973c9f4f | 255 | } |
1da177e4 | 256 | |
1da177e4 | 257 | /* |
973c9f4f DH |
258 | * Join a (named) session keyring. |
259 | * | |
260 | * Create and join an anonymous session keyring or join a named session | |
261 | * keyring, creating it if necessary. A named session keyring must have Search | |
262 | * permission for it to be joined. Session keyrings without this permit will | |
263 | * be skipped over. | |
264 | * | |
265 | * If successful, the ID of the joined session keyring will be returned. | |
1da177e4 LT |
266 | */ |
267 | long keyctl_join_session_keyring(const char __user *_name) | |
268 | { | |
269 | char *name; | |
0cb409d9 | 270 | long ret; |
1da177e4 LT |
271 | |
272 | /* fetch the name from userspace */ | |
273 | name = NULL; | |
274 | if (_name) { | |
0cb409d9 DA |
275 | name = strndup_user(_name, PAGE_SIZE); |
276 | if (IS_ERR(name)) { | |
277 | ret = PTR_ERR(name); | |
1da177e4 | 278 | goto error; |
0cb409d9 | 279 | } |
1da177e4 LT |
280 | } |
281 | ||
282 | /* join the session */ | |
283 | ret = join_session_keyring(name); | |
0d54ee1c | 284 | kfree(name); |
1da177e4 | 285 | |
c5b60b5e | 286 | error: |
1da177e4 | 287 | return ret; |
a8b17ed0 | 288 | } |
1da177e4 | 289 | |
1da177e4 | 290 | /* |
973c9f4f DH |
291 | * Update a key's data payload from the given data. |
292 | * | |
293 | * The key must grant the caller Write permission and the key type must support | |
294 | * updating for this to work. A negative key can be positively instantiated | |
295 | * with this call. | |
296 | * | |
297 | * If successful, 0 will be returned. If the key type does not support | |
298 | * updating, then -EOPNOTSUPP will be returned. | |
1da177e4 LT |
299 | */ |
300 | long keyctl_update_key(key_serial_t id, | |
301 | const void __user *_payload, | |
302 | size_t plen) | |
303 | { | |
664cceb0 | 304 | key_ref_t key_ref; |
1da177e4 LT |
305 | void *payload; |
306 | long ret; | |
307 | ||
308 | ret = -EINVAL; | |
309 | if (plen > PAGE_SIZE) | |
310 | goto error; | |
311 | ||
312 | /* pull the payload in if one was supplied */ | |
313 | payload = NULL; | |
314 | if (_payload) { | |
315 | ret = -ENOMEM; | |
316 | payload = kmalloc(plen, GFP_KERNEL); | |
317 | if (!payload) | |
318 | goto error; | |
319 | ||
320 | ret = -EFAULT; | |
321 | if (copy_from_user(payload, _payload, plen) != 0) | |
322 | goto error2; | |
323 | } | |
324 | ||
325 | /* find the target key (which must be writable) */ | |
5593122e | 326 | key_ref = lookup_user_key(id, 0, KEY_WRITE); |
664cceb0 DH |
327 | if (IS_ERR(key_ref)) { |
328 | ret = PTR_ERR(key_ref); | |
1da177e4 LT |
329 | goto error2; |
330 | } | |
331 | ||
332 | /* update the key */ | |
664cceb0 | 333 | ret = key_update(key_ref, payload, plen); |
1da177e4 | 334 | |
664cceb0 | 335 | key_ref_put(key_ref); |
c5b60b5e | 336 | error2: |
1da177e4 | 337 | kfree(payload); |
c5b60b5e | 338 | error: |
1da177e4 | 339 | return ret; |
a8b17ed0 | 340 | } |
1da177e4 | 341 | |
1da177e4 | 342 | /* |
973c9f4f DH |
343 | * Revoke a key. |
344 | * | |
345 | * The key must be grant the caller Write or Setattr permission for this to | |
346 | * work. The key type should give up its quota claim when revoked. The key | |
347 | * and any links to the key will be automatically garbage collected after a | |
348 | * certain amount of time (/proc/sys/kernel/keys/gc_delay). | |
349 | * | |
350 | * If successful, 0 is returned. | |
1da177e4 LT |
351 | */ |
352 | long keyctl_revoke_key(key_serial_t id) | |
353 | { | |
664cceb0 | 354 | key_ref_t key_ref; |
1da177e4 LT |
355 | long ret; |
356 | ||
5593122e | 357 | key_ref = lookup_user_key(id, 0, KEY_WRITE); |
664cceb0 DH |
358 | if (IS_ERR(key_ref)) { |
359 | ret = PTR_ERR(key_ref); | |
0c2c9a3f DH |
360 | if (ret != -EACCES) |
361 | goto error; | |
362 | key_ref = lookup_user_key(id, 0, KEY_SETATTR); | |
363 | if (IS_ERR(key_ref)) { | |
364 | ret = PTR_ERR(key_ref); | |
365 | goto error; | |
366 | } | |
1da177e4 LT |
367 | } |
368 | ||
664cceb0 | 369 | key_revoke(key_ref_to_ptr(key_ref)); |
1da177e4 LT |
370 | ret = 0; |
371 | ||
664cceb0 | 372 | key_ref_put(key_ref); |
c5b60b5e | 373 | error: |
1260f801 | 374 | return ret; |
a8b17ed0 | 375 | } |
1da177e4 | 376 | |
fd75815f DH |
377 | /* |
378 | * Invalidate a key. | |
379 | * | |
380 | * The key must be grant the caller Invalidate permission for this to work. | |
381 | * The key and any links to the key will be automatically garbage collected | |
382 | * immediately. | |
383 | * | |
384 | * If successful, 0 is returned. | |
385 | */ | |
386 | long keyctl_invalidate_key(key_serial_t id) | |
387 | { | |
388 | key_ref_t key_ref; | |
389 | long ret; | |
390 | ||
391 | kenter("%d", id); | |
392 | ||
393 | key_ref = lookup_user_key(id, 0, KEY_SEARCH); | |
394 | if (IS_ERR(key_ref)) { | |
395 | ret = PTR_ERR(key_ref); | |
396 | goto error; | |
397 | } | |
398 | ||
399 | key_invalidate(key_ref_to_ptr(key_ref)); | |
400 | ret = 0; | |
401 | ||
402 | key_ref_put(key_ref); | |
403 | error: | |
404 | kleave(" = %ld", ret); | |
405 | return ret; | |
406 | } | |
407 | ||
1da177e4 | 408 | /* |
973c9f4f DH |
409 | * Clear the specified keyring, creating an empty process keyring if one of the |
410 | * special keyring IDs is used. | |
411 | * | |
412 | * The keyring must grant the caller Write permission for this to work. If | |
413 | * successful, 0 will be returned. | |
1da177e4 LT |
414 | */ |
415 | long keyctl_keyring_clear(key_serial_t ringid) | |
416 | { | |
664cceb0 | 417 | key_ref_t keyring_ref; |
1da177e4 LT |
418 | long ret; |
419 | ||
5593122e | 420 | keyring_ref = lookup_user_key(ringid, KEY_LOOKUP_CREATE, KEY_WRITE); |
664cceb0 DH |
421 | if (IS_ERR(keyring_ref)) { |
422 | ret = PTR_ERR(keyring_ref); | |
700920eb DH |
423 | |
424 | /* Root is permitted to invalidate certain special keyrings */ | |
425 | if (capable(CAP_SYS_ADMIN)) { | |
426 | keyring_ref = lookup_user_key(ringid, 0, 0); | |
427 | if (IS_ERR(keyring_ref)) | |
428 | goto error; | |
429 | if (test_bit(KEY_FLAG_ROOT_CAN_CLEAR, | |
430 | &key_ref_to_ptr(keyring_ref)->flags)) | |
431 | goto clear; | |
432 | goto error_put; | |
433 | } | |
434 | ||
1da177e4 LT |
435 | goto error; |
436 | } | |
437 | ||
700920eb | 438 | clear: |
664cceb0 | 439 | ret = keyring_clear(key_ref_to_ptr(keyring_ref)); |
700920eb | 440 | error_put: |
664cceb0 | 441 | key_ref_put(keyring_ref); |
c5b60b5e | 442 | error: |
1da177e4 | 443 | return ret; |
a8b17ed0 | 444 | } |
1da177e4 | 445 | |
1da177e4 | 446 | /* |
973c9f4f DH |
447 | * Create a link from a keyring to a key if there's no matching key in the |
448 | * keyring, otherwise replace the link to the matching key with a link to the | |
449 | * new key. | |
450 | * | |
451 | * The key must grant the caller Link permission and the the keyring must grant | |
452 | * the caller Write permission. Furthermore, if an additional link is created, | |
453 | * the keyring's quota will be extended. | |
454 | * | |
455 | * If successful, 0 will be returned. | |
1da177e4 LT |
456 | */ |
457 | long keyctl_keyring_link(key_serial_t id, key_serial_t ringid) | |
458 | { | |
664cceb0 | 459 | key_ref_t keyring_ref, key_ref; |
1da177e4 LT |
460 | long ret; |
461 | ||
5593122e | 462 | keyring_ref = lookup_user_key(ringid, KEY_LOOKUP_CREATE, KEY_WRITE); |
664cceb0 DH |
463 | if (IS_ERR(keyring_ref)) { |
464 | ret = PTR_ERR(keyring_ref); | |
1da177e4 LT |
465 | goto error; |
466 | } | |
467 | ||
5593122e | 468 | key_ref = lookup_user_key(id, KEY_LOOKUP_CREATE, KEY_LINK); |
664cceb0 DH |
469 | if (IS_ERR(key_ref)) { |
470 | ret = PTR_ERR(key_ref); | |
1da177e4 LT |
471 | goto error2; |
472 | } | |
473 | ||
664cceb0 | 474 | ret = key_link(key_ref_to_ptr(keyring_ref), key_ref_to_ptr(key_ref)); |
1da177e4 | 475 | |
664cceb0 | 476 | key_ref_put(key_ref); |
c5b60b5e | 477 | error2: |
664cceb0 | 478 | key_ref_put(keyring_ref); |
c5b60b5e | 479 | error: |
1da177e4 | 480 | return ret; |
a8b17ed0 | 481 | } |
1da177e4 | 482 | |
1da177e4 | 483 | /* |
973c9f4f DH |
484 | * Unlink a key from a keyring. |
485 | * | |
486 | * The keyring must grant the caller Write permission for this to work; the key | |
487 | * itself need not grant the caller anything. If the last link to a key is | |
488 | * removed then that key will be scheduled for destruction. | |
489 | * | |
490 | * If successful, 0 will be returned. | |
1da177e4 LT |
491 | */ |
492 | long keyctl_keyring_unlink(key_serial_t id, key_serial_t ringid) | |
493 | { | |
664cceb0 | 494 | key_ref_t keyring_ref, key_ref; |
1da177e4 LT |
495 | long ret; |
496 | ||
5593122e | 497 | keyring_ref = lookup_user_key(ringid, 0, KEY_WRITE); |
664cceb0 DH |
498 | if (IS_ERR(keyring_ref)) { |
499 | ret = PTR_ERR(keyring_ref); | |
1da177e4 LT |
500 | goto error; |
501 | } | |
502 | ||
5593122e | 503 | key_ref = lookup_user_key(id, KEY_LOOKUP_FOR_UNLINK, 0); |
664cceb0 DH |
504 | if (IS_ERR(key_ref)) { |
505 | ret = PTR_ERR(key_ref); | |
1da177e4 LT |
506 | goto error2; |
507 | } | |
508 | ||
664cceb0 | 509 | ret = key_unlink(key_ref_to_ptr(keyring_ref), key_ref_to_ptr(key_ref)); |
1da177e4 | 510 | |
664cceb0 | 511 | key_ref_put(key_ref); |
c5b60b5e | 512 | error2: |
664cceb0 | 513 | key_ref_put(keyring_ref); |
c5b60b5e | 514 | error: |
1da177e4 | 515 | return ret; |
a8b17ed0 | 516 | } |
1da177e4 | 517 | |
1da177e4 | 518 | /* |
973c9f4f DH |
519 | * Return a description of a key to userspace. |
520 | * | |
521 | * The key must grant the caller View permission for this to work. | |
522 | * | |
523 | * If there's a buffer, we place up to buflen bytes of data into it formatted | |
524 | * in the following way: | |
525 | * | |
1da177e4 | 526 | * type;uid;gid;perm;description<NUL> |
973c9f4f DH |
527 | * |
528 | * If successful, we return the amount of description available, irrespective | |
529 | * of how much we may have copied into the buffer. | |
1da177e4 LT |
530 | */ |
531 | long keyctl_describe_key(key_serial_t keyid, | |
532 | char __user *buffer, | |
533 | size_t buflen) | |
534 | { | |
3e30148c | 535 | struct key *key, *instkey; |
664cceb0 | 536 | key_ref_t key_ref; |
1da177e4 LT |
537 | char *tmpbuf; |
538 | long ret; | |
539 | ||
5593122e | 540 | key_ref = lookup_user_key(keyid, KEY_LOOKUP_PARTIAL, KEY_VIEW); |
664cceb0 | 541 | if (IS_ERR(key_ref)) { |
3e30148c DH |
542 | /* viewing a key under construction is permitted if we have the |
543 | * authorisation token handy */ | |
664cceb0 | 544 | if (PTR_ERR(key_ref) == -EACCES) { |
3e30148c DH |
545 | instkey = key_get_instantiation_authkey(keyid); |
546 | if (!IS_ERR(instkey)) { | |
547 | key_put(instkey); | |
8bbf4976 | 548 | key_ref = lookup_user_key(keyid, |
5593122e DH |
549 | KEY_LOOKUP_PARTIAL, |
550 | 0); | |
664cceb0 | 551 | if (!IS_ERR(key_ref)) |
3e30148c DH |
552 | goto okay; |
553 | } | |
554 | } | |
555 | ||
664cceb0 | 556 | ret = PTR_ERR(key_ref); |
1da177e4 LT |
557 | goto error; |
558 | } | |
559 | ||
3e30148c | 560 | okay: |
1da177e4 LT |
561 | /* calculate how much description we're going to return */ |
562 | ret = -ENOMEM; | |
563 | tmpbuf = kmalloc(PAGE_SIZE, GFP_KERNEL); | |
564 | if (!tmpbuf) | |
565 | goto error2; | |
566 | ||
664cceb0 DH |
567 | key = key_ref_to_ptr(key_ref); |
568 | ||
1da177e4 | 569 | ret = snprintf(tmpbuf, PAGE_SIZE - 1, |
664cceb0 | 570 | "%s;%d;%d;%08x;%s", |
94fd8405 DH |
571 | key->type->name, |
572 | key->uid, | |
573 | key->gid, | |
574 | key->perm, | |
575 | key->description ?: ""); | |
1da177e4 LT |
576 | |
577 | /* include a NUL char at the end of the data */ | |
578 | if (ret > PAGE_SIZE - 1) | |
579 | ret = PAGE_SIZE - 1; | |
580 | tmpbuf[ret] = 0; | |
581 | ret++; | |
582 | ||
583 | /* consider returning the data */ | |
584 | if (buffer && buflen > 0) { | |
585 | if (buflen > ret) | |
586 | buflen = ret; | |
587 | ||
588 | if (copy_to_user(buffer, tmpbuf, buflen) != 0) | |
589 | ret = -EFAULT; | |
590 | } | |
591 | ||
592 | kfree(tmpbuf); | |
c5b60b5e | 593 | error2: |
664cceb0 | 594 | key_ref_put(key_ref); |
c5b60b5e | 595 | error: |
1da177e4 | 596 | return ret; |
a8b17ed0 | 597 | } |
1da177e4 | 598 | |
1da177e4 | 599 | /* |
973c9f4f DH |
600 | * Search the specified keyring and any keyrings it links to for a matching |
601 | * key. Only keyrings that grant the caller Search permission will be searched | |
602 | * (this includes the starting keyring). Only keys with Search permission can | |
603 | * be found. | |
604 | * | |
605 | * If successful, the found key will be linked to the destination keyring if | |
606 | * supplied and the key has Link permission, and the found key ID will be | |
607 | * returned. | |
1da177e4 LT |
608 | */ |
609 | long keyctl_keyring_search(key_serial_t ringid, | |
610 | const char __user *_type, | |
611 | const char __user *_description, | |
612 | key_serial_t destringid) | |
613 | { | |
614 | struct key_type *ktype; | |
664cceb0 | 615 | key_ref_t keyring_ref, key_ref, dest_ref; |
1da177e4 | 616 | char type[32], *description; |
0cb409d9 | 617 | long ret; |
1da177e4 LT |
618 | |
619 | /* pull the type and description into kernel space */ | |
0cb409d9 | 620 | ret = key_get_type_from_user(type, _type, sizeof(type)); |
1da177e4 LT |
621 | if (ret < 0) |
622 | goto error; | |
1da177e4 | 623 | |
0cb409d9 DA |
624 | description = strndup_user(_description, PAGE_SIZE); |
625 | if (IS_ERR(description)) { | |
626 | ret = PTR_ERR(description); | |
1da177e4 | 627 | goto error; |
0cb409d9 | 628 | } |
1da177e4 LT |
629 | |
630 | /* get the keyring at which to begin the search */ | |
5593122e | 631 | keyring_ref = lookup_user_key(ringid, 0, KEY_SEARCH); |
664cceb0 DH |
632 | if (IS_ERR(keyring_ref)) { |
633 | ret = PTR_ERR(keyring_ref); | |
1da177e4 LT |
634 | goto error2; |
635 | } | |
636 | ||
637 | /* get the destination keyring if specified */ | |
664cceb0 | 638 | dest_ref = NULL; |
1da177e4 | 639 | if (destringid) { |
5593122e DH |
640 | dest_ref = lookup_user_key(destringid, KEY_LOOKUP_CREATE, |
641 | KEY_WRITE); | |
664cceb0 DH |
642 | if (IS_ERR(dest_ref)) { |
643 | ret = PTR_ERR(dest_ref); | |
1da177e4 LT |
644 | goto error3; |
645 | } | |
646 | } | |
647 | ||
648 | /* find the key type */ | |
649 | ktype = key_type_lookup(type); | |
650 | if (IS_ERR(ktype)) { | |
651 | ret = PTR_ERR(ktype); | |
652 | goto error4; | |
653 | } | |
654 | ||
655 | /* do the search */ | |
664cceb0 DH |
656 | key_ref = keyring_search(keyring_ref, ktype, description); |
657 | if (IS_ERR(key_ref)) { | |
658 | ret = PTR_ERR(key_ref); | |
1da177e4 LT |
659 | |
660 | /* treat lack or presence of a negative key the same */ | |
661 | if (ret == -EAGAIN) | |
662 | ret = -ENOKEY; | |
663 | goto error5; | |
664 | } | |
665 | ||
666 | /* link the resulting key to the destination keyring if we can */ | |
664cceb0 | 667 | if (dest_ref) { |
29db9190 DH |
668 | ret = key_permission(key_ref, KEY_LINK); |
669 | if (ret < 0) | |
1da177e4 LT |
670 | goto error6; |
671 | ||
664cceb0 | 672 | ret = key_link(key_ref_to_ptr(dest_ref), key_ref_to_ptr(key_ref)); |
1da177e4 LT |
673 | if (ret < 0) |
674 | goto error6; | |
675 | } | |
676 | ||
664cceb0 | 677 | ret = key_ref_to_ptr(key_ref)->serial; |
1da177e4 | 678 | |
c5b60b5e | 679 | error6: |
664cceb0 | 680 | key_ref_put(key_ref); |
c5b60b5e | 681 | error5: |
1da177e4 | 682 | key_type_put(ktype); |
c5b60b5e | 683 | error4: |
664cceb0 | 684 | key_ref_put(dest_ref); |
c5b60b5e | 685 | error3: |
664cceb0 | 686 | key_ref_put(keyring_ref); |
c5b60b5e | 687 | error2: |
1da177e4 | 688 | kfree(description); |
c5b60b5e | 689 | error: |
1da177e4 | 690 | return ret; |
a8b17ed0 | 691 | } |
1da177e4 | 692 | |
1da177e4 | 693 | /* |
973c9f4f DH |
694 | * Read a key's payload. |
695 | * | |
696 | * The key must either grant the caller Read permission, or it must grant the | |
697 | * caller Search permission when searched for from the process keyrings. | |
698 | * | |
699 | * If successful, we place up to buflen bytes of data into the buffer, if one | |
700 | * is provided, and return the amount of data that is available in the key, | |
701 | * irrespective of how much we copied into the buffer. | |
1da177e4 LT |
702 | */ |
703 | long keyctl_read_key(key_serial_t keyid, char __user *buffer, size_t buflen) | |
704 | { | |
664cceb0 DH |
705 | struct key *key; |
706 | key_ref_t key_ref; | |
1da177e4 LT |
707 | long ret; |
708 | ||
709 | /* find the key first */ | |
5593122e | 710 | key_ref = lookup_user_key(keyid, 0, 0); |
664cceb0 DH |
711 | if (IS_ERR(key_ref)) { |
712 | ret = -ENOKEY; | |
713 | goto error; | |
1da177e4 LT |
714 | } |
715 | ||
664cceb0 DH |
716 | key = key_ref_to_ptr(key_ref); |
717 | ||
718 | /* see if we can read it directly */ | |
29db9190 DH |
719 | ret = key_permission(key_ref, KEY_READ); |
720 | if (ret == 0) | |
664cceb0 | 721 | goto can_read_key; |
29db9190 DH |
722 | if (ret != -EACCES) |
723 | goto error; | |
664cceb0 DH |
724 | |
725 | /* we can't; see if it's searchable from this process's keyrings | |
726 | * - we automatically take account of the fact that it may be | |
727 | * dangling off an instantiation key | |
728 | */ | |
729 | if (!is_key_possessed(key_ref)) { | |
730 | ret = -EACCES; | |
731 | goto error2; | |
732 | } | |
1da177e4 LT |
733 | |
734 | /* the key is probably readable - now try to read it */ | |
c5b60b5e | 735 | can_read_key: |
1da177e4 LT |
736 | ret = key_validate(key); |
737 | if (ret == 0) { | |
738 | ret = -EOPNOTSUPP; | |
739 | if (key->type->read) { | |
740 | /* read the data with the semaphore held (since we | |
741 | * might sleep) */ | |
742 | down_read(&key->sem); | |
743 | ret = key->type->read(key, buffer, buflen); | |
744 | up_read(&key->sem); | |
745 | } | |
746 | } | |
747 | ||
c5b60b5e | 748 | error2: |
1da177e4 | 749 | key_put(key); |
c5b60b5e | 750 | error: |
1da177e4 | 751 | return ret; |
a8b17ed0 | 752 | } |
1da177e4 | 753 | |
1da177e4 | 754 | /* |
973c9f4f DH |
755 | * Change the ownership of a key |
756 | * | |
757 | * The key must grant the caller Setattr permission for this to work, though | |
758 | * the key need not be fully instantiated yet. For the UID to be changed, or | |
759 | * for the GID to be changed to a group the caller is not a member of, the | |
760 | * caller must have sysadmin capability. If either uid or gid is -1 then that | |
761 | * attribute is not changed. | |
762 | * | |
763 | * If the UID is to be changed, the new user must have sufficient quota to | |
764 | * accept the key. The quota deduction will be removed from the old user to | |
765 | * the new user should the attribute be changed. | |
766 | * | |
767 | * If successful, 0 will be returned. | |
1da177e4 LT |
768 | */ |
769 | long keyctl_chown_key(key_serial_t id, uid_t uid, gid_t gid) | |
770 | { | |
5801649d | 771 | struct key_user *newowner, *zapowner = NULL; |
1da177e4 | 772 | struct key *key; |
664cceb0 | 773 | key_ref_t key_ref; |
1da177e4 LT |
774 | long ret; |
775 | ||
776 | ret = 0; | |
777 | if (uid == (uid_t) -1 && gid == (gid_t) -1) | |
778 | goto error; | |
779 | ||
5593122e DH |
780 | key_ref = lookup_user_key(id, KEY_LOOKUP_CREATE | KEY_LOOKUP_PARTIAL, |
781 | KEY_SETATTR); | |
664cceb0 DH |
782 | if (IS_ERR(key_ref)) { |
783 | ret = PTR_ERR(key_ref); | |
1da177e4 LT |
784 | goto error; |
785 | } | |
786 | ||
664cceb0 DH |
787 | key = key_ref_to_ptr(key_ref); |
788 | ||
1da177e4 LT |
789 | /* make the changes with the locks held to prevent chown/chown races */ |
790 | ret = -EACCES; | |
791 | down_write(&key->sem); | |
1da177e4 LT |
792 | |
793 | if (!capable(CAP_SYS_ADMIN)) { | |
794 | /* only the sysadmin can chown a key to some other UID */ | |
795 | if (uid != (uid_t) -1 && key->uid != uid) | |
5801649d | 796 | goto error_put; |
1da177e4 LT |
797 | |
798 | /* only the sysadmin can set the key's GID to a group other | |
799 | * than one of those that the current process subscribes to */ | |
800 | if (gid != (gid_t) -1 && gid != key->gid && !in_group_p(gid)) | |
5801649d | 801 | goto error_put; |
1da177e4 LT |
802 | } |
803 | ||
5801649d | 804 | /* change the UID */ |
1da177e4 | 805 | if (uid != (uid_t) -1 && uid != key->uid) { |
5801649d | 806 | ret = -ENOMEM; |
1d1e9756 | 807 | newowner = key_user_lookup(uid, current_user_ns()); |
5801649d FT |
808 | if (!newowner) |
809 | goto error_put; | |
810 | ||
811 | /* transfer the quota burden to the new user */ | |
812 | if (test_bit(KEY_FLAG_IN_QUOTA, &key->flags)) { | |
0b77f5bf DH |
813 | unsigned maxkeys = (uid == 0) ? |
814 | key_quota_root_maxkeys : key_quota_maxkeys; | |
815 | unsigned maxbytes = (uid == 0) ? | |
816 | key_quota_root_maxbytes : key_quota_maxbytes; | |
817 | ||
5801649d | 818 | spin_lock(&newowner->lock); |
0b77f5bf DH |
819 | if (newowner->qnkeys + 1 >= maxkeys || |
820 | newowner->qnbytes + key->quotalen >= maxbytes || | |
821 | newowner->qnbytes + key->quotalen < | |
822 | newowner->qnbytes) | |
5801649d FT |
823 | goto quota_overrun; |
824 | ||
825 | newowner->qnkeys++; | |
826 | newowner->qnbytes += key->quotalen; | |
827 | spin_unlock(&newowner->lock); | |
828 | ||
829 | spin_lock(&key->user->lock); | |
830 | key->user->qnkeys--; | |
831 | key->user->qnbytes -= key->quotalen; | |
832 | spin_unlock(&key->user->lock); | |
833 | } | |
834 | ||
835 | atomic_dec(&key->user->nkeys); | |
836 | atomic_inc(&newowner->nkeys); | |
837 | ||
838 | if (test_bit(KEY_FLAG_INSTANTIATED, &key->flags)) { | |
839 | atomic_dec(&key->user->nikeys); | |
840 | atomic_inc(&newowner->nikeys); | |
841 | } | |
842 | ||
843 | zapowner = key->user; | |
844 | key->user = newowner; | |
845 | key->uid = uid; | |
1da177e4 LT |
846 | } |
847 | ||
848 | /* change the GID */ | |
849 | if (gid != (gid_t) -1) | |
850 | key->gid = gid; | |
851 | ||
852 | ret = 0; | |
853 | ||
5801649d | 854 | error_put: |
1da177e4 LT |
855 | up_write(&key->sem); |
856 | key_put(key); | |
5801649d FT |
857 | if (zapowner) |
858 | key_user_put(zapowner); | |
859 | error: | |
1da177e4 LT |
860 | return ret; |
861 | ||
5801649d FT |
862 | quota_overrun: |
863 | spin_unlock(&newowner->lock); | |
864 | zapowner = newowner; | |
865 | ret = -EDQUOT; | |
866 | goto error_put; | |
a8b17ed0 | 867 | } |
5801649d | 868 | |
1da177e4 | 869 | /* |
973c9f4f DH |
870 | * Change the permission mask on a key. |
871 | * | |
872 | * The key must grant the caller Setattr permission for this to work, though | |
873 | * the key need not be fully instantiated yet. If the caller does not have | |
874 | * sysadmin capability, it may only change the permission on keys that it owns. | |
1da177e4 LT |
875 | */ |
876 | long keyctl_setperm_key(key_serial_t id, key_perm_t perm) | |
877 | { | |
878 | struct key *key; | |
664cceb0 | 879 | key_ref_t key_ref; |
1da177e4 LT |
880 | long ret; |
881 | ||
882 | ret = -EINVAL; | |
664cceb0 | 883 | if (perm & ~(KEY_POS_ALL | KEY_USR_ALL | KEY_GRP_ALL | KEY_OTH_ALL)) |
1da177e4 LT |
884 | goto error; |
885 | ||
5593122e DH |
886 | key_ref = lookup_user_key(id, KEY_LOOKUP_CREATE | KEY_LOOKUP_PARTIAL, |
887 | KEY_SETATTR); | |
664cceb0 DH |
888 | if (IS_ERR(key_ref)) { |
889 | ret = PTR_ERR(key_ref); | |
1da177e4 LT |
890 | goto error; |
891 | } | |
892 | ||
664cceb0 DH |
893 | key = key_ref_to_ptr(key_ref); |
894 | ||
76d8aeab | 895 | /* make the changes with the locks held to prevent chown/chmod races */ |
1da177e4 LT |
896 | ret = -EACCES; |
897 | down_write(&key->sem); | |
1da177e4 | 898 | |
76d8aeab | 899 | /* if we're not the sysadmin, we can only change a key that we own */ |
47d804bf | 900 | if (capable(CAP_SYS_ADMIN) || key->uid == current_fsuid()) { |
76d8aeab DH |
901 | key->perm = perm; |
902 | ret = 0; | |
903 | } | |
1da177e4 | 904 | |
1da177e4 LT |
905 | up_write(&key->sem); |
906 | key_put(key); | |
76d8aeab | 907 | error: |
1da177e4 | 908 | return ret; |
a8b17ed0 | 909 | } |
1da177e4 | 910 | |
8bbf4976 | 911 | /* |
973c9f4f DH |
912 | * Get the destination keyring for instantiation and check that the caller has |
913 | * Write permission on it. | |
8bbf4976 DH |
914 | */ |
915 | static long get_instantiation_keyring(key_serial_t ringid, | |
916 | struct request_key_auth *rka, | |
917 | struct key **_dest_keyring) | |
918 | { | |
919 | key_ref_t dkref; | |
920 | ||
eca1bf5b DH |
921 | *_dest_keyring = NULL; |
922 | ||
8bbf4976 | 923 | /* just return a NULL pointer if we weren't asked to make a link */ |
eca1bf5b | 924 | if (ringid == 0) |
8bbf4976 | 925 | return 0; |
8bbf4976 DH |
926 | |
927 | /* if a specific keyring is nominated by ID, then use that */ | |
928 | if (ringid > 0) { | |
5593122e | 929 | dkref = lookup_user_key(ringid, KEY_LOOKUP_CREATE, KEY_WRITE); |
8bbf4976 DH |
930 | if (IS_ERR(dkref)) |
931 | return PTR_ERR(dkref); | |
932 | *_dest_keyring = key_ref_to_ptr(dkref); | |
933 | return 0; | |
934 | } | |
935 | ||
936 | if (ringid == KEY_SPEC_REQKEY_AUTH_KEY) | |
937 | return -EINVAL; | |
938 | ||
939 | /* otherwise specify the destination keyring recorded in the | |
940 | * authorisation key (any KEY_SPEC_*_KEYRING) */ | |
941 | if (ringid >= KEY_SPEC_REQUESTOR_KEYRING) { | |
21279cfa | 942 | *_dest_keyring = key_get(rka->dest_keyring); |
8bbf4976 DH |
943 | return 0; |
944 | } | |
945 | ||
946 | return -ENOKEY; | |
947 | } | |
948 | ||
d84f4f99 | 949 | /* |
973c9f4f | 950 | * Change the request_key authorisation key on the current process. |
d84f4f99 DH |
951 | */ |
952 | static int keyctl_change_reqkey_auth(struct key *key) | |
953 | { | |
954 | struct cred *new; | |
955 | ||
956 | new = prepare_creds(); | |
957 | if (!new) | |
958 | return -ENOMEM; | |
959 | ||
960 | key_put(new->request_key_auth); | |
961 | new->request_key_auth = key_get(key); | |
962 | ||
963 | return commit_creds(new); | |
964 | } | |
965 | ||
ee009e4a DH |
966 | /* |
967 | * Copy the iovec data from userspace | |
968 | */ | |
969 | static long copy_from_user_iovec(void *buffer, const struct iovec *iov, | |
970 | unsigned ioc) | |
971 | { | |
972 | for (; ioc > 0; ioc--) { | |
973 | if (copy_from_user(buffer, iov->iov_base, iov->iov_len) != 0) | |
974 | return -EFAULT; | |
975 | buffer += iov->iov_len; | |
976 | iov++; | |
977 | } | |
978 | return 0; | |
979 | } | |
980 | ||
1da177e4 | 981 | /* |
973c9f4f DH |
982 | * Instantiate a key with the specified payload and link the key into the |
983 | * destination keyring if one is given. | |
984 | * | |
985 | * The caller must have the appropriate instantiation permit set for this to | |
986 | * work (see keyctl_assume_authority). No other permissions are required. | |
987 | * | |
988 | * If successful, 0 will be returned. | |
1da177e4 | 989 | */ |
ee009e4a DH |
990 | long keyctl_instantiate_key_common(key_serial_t id, |
991 | const struct iovec *payload_iov, | |
992 | unsigned ioc, | |
993 | size_t plen, | |
994 | key_serial_t ringid) | |
1da177e4 | 995 | { |
d84f4f99 | 996 | const struct cred *cred = current_cred(); |
3e30148c | 997 | struct request_key_auth *rka; |
8bbf4976 | 998 | struct key *instkey, *dest_keyring; |
1da177e4 LT |
999 | void *payload; |
1000 | long ret; | |
38bbca6b | 1001 | bool vm = false; |
1da177e4 | 1002 | |
d84f4f99 DH |
1003 | kenter("%d,,%zu,%d", id, plen, ringid); |
1004 | ||
1da177e4 | 1005 | ret = -EINVAL; |
38bbca6b | 1006 | if (plen > 1024 * 1024 - 1) |
1da177e4 LT |
1007 | goto error; |
1008 | ||
b5f545c8 DH |
1009 | /* the appropriate instantiation authorisation key must have been |
1010 | * assumed before calling this */ | |
1011 | ret = -EPERM; | |
d84f4f99 | 1012 | instkey = cred->request_key_auth; |
b5f545c8 DH |
1013 | if (!instkey) |
1014 | goto error; | |
1015 | ||
1016 | rka = instkey->payload.data; | |
1017 | if (rka->target_key->serial != id) | |
1018 | goto error; | |
1019 | ||
1da177e4 LT |
1020 | /* pull the payload in if one was supplied */ |
1021 | payload = NULL; | |
1022 | ||
ee009e4a | 1023 | if (payload_iov) { |
1da177e4 LT |
1024 | ret = -ENOMEM; |
1025 | payload = kmalloc(plen, GFP_KERNEL); | |
38bbca6b DH |
1026 | if (!payload) { |
1027 | if (plen <= PAGE_SIZE) | |
1028 | goto error; | |
1029 | vm = true; | |
1030 | payload = vmalloc(plen); | |
1031 | if (!payload) | |
1032 | goto error; | |
1033 | } | |
1da177e4 | 1034 | |
ee009e4a DH |
1035 | ret = copy_from_user_iovec(payload, payload_iov, ioc); |
1036 | if (ret < 0) | |
1da177e4 LT |
1037 | goto error2; |
1038 | } | |
1039 | ||
3e30148c DH |
1040 | /* find the destination keyring amongst those belonging to the |
1041 | * requesting task */ | |
8bbf4976 DH |
1042 | ret = get_instantiation_keyring(ringid, rka, &dest_keyring); |
1043 | if (ret < 0) | |
1044 | goto error2; | |
1da177e4 LT |
1045 | |
1046 | /* instantiate the key and link it into a keyring */ | |
3e30148c | 1047 | ret = key_instantiate_and_link(rka->target_key, payload, plen, |
8bbf4976 | 1048 | dest_keyring, instkey); |
1da177e4 | 1049 | |
8bbf4976 | 1050 | key_put(dest_keyring); |
b5f545c8 DH |
1051 | |
1052 | /* discard the assumed authority if it's just been disabled by | |
1053 | * instantiation of the key */ | |
d84f4f99 DH |
1054 | if (ret == 0) |
1055 | keyctl_change_reqkey_auth(NULL); | |
b5f545c8 DH |
1056 | |
1057 | error2: | |
38bbca6b DH |
1058 | if (!vm) |
1059 | kfree(payload); | |
1060 | else | |
1061 | vfree(payload); | |
b5f545c8 | 1062 | error: |
1da177e4 | 1063 | return ret; |
a8b17ed0 | 1064 | } |
1da177e4 | 1065 | |
ee009e4a DH |
1066 | /* |
1067 | * Instantiate a key with the specified payload and link the key into the | |
1068 | * destination keyring if one is given. | |
1069 | * | |
1070 | * The caller must have the appropriate instantiation permit set for this to | |
1071 | * work (see keyctl_assume_authority). No other permissions are required. | |
1072 | * | |
1073 | * If successful, 0 will be returned. | |
1074 | */ | |
1075 | long keyctl_instantiate_key(key_serial_t id, | |
1076 | const void __user *_payload, | |
1077 | size_t plen, | |
1078 | key_serial_t ringid) | |
1079 | { | |
1080 | if (_payload && plen) { | |
1081 | struct iovec iov[1] = { | |
1082 | [0].iov_base = (void __user *)_payload, | |
1083 | [0].iov_len = plen | |
1084 | }; | |
1085 | ||
1086 | return keyctl_instantiate_key_common(id, iov, 1, plen, ringid); | |
1087 | } | |
1088 | ||
1089 | return keyctl_instantiate_key_common(id, NULL, 0, 0, ringid); | |
1090 | } | |
1091 | ||
1092 | /* | |
1093 | * Instantiate a key with the specified multipart payload and link the key into | |
1094 | * the 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_iov(key_serial_t id, | |
1102 | const struct iovec __user *_payload_iov, | |
1103 | unsigned ioc, | |
1104 | key_serial_t ringid) | |
1105 | { | |
1106 | struct iovec iovstack[UIO_FASTIOV], *iov = iovstack; | |
1107 | long ret; | |
1108 | ||
1109 | if (_payload_iov == 0 || ioc == 0) | |
1110 | goto no_payload; | |
1111 | ||
1112 | ret = rw_copy_check_uvector(WRITE, _payload_iov, ioc, | |
fcf63409 | 1113 | ARRAY_SIZE(iovstack), iovstack, &iov, 1); |
ee009e4a DH |
1114 | if (ret < 0) |
1115 | return ret; | |
1116 | if (ret == 0) | |
1117 | goto no_payload_free; | |
1118 | ||
1119 | ret = keyctl_instantiate_key_common(id, iov, ioc, ret, ringid); | |
1120 | ||
1121 | if (iov != iovstack) | |
1122 | kfree(iov); | |
1123 | return ret; | |
1124 | ||
1125 | no_payload_free: | |
1126 | if (iov != iovstack) | |
1127 | kfree(iov); | |
1128 | no_payload: | |
1129 | return keyctl_instantiate_key_common(id, NULL, 0, 0, ringid); | |
1130 | } | |
1131 | ||
1da177e4 | 1132 | /* |
973c9f4f DH |
1133 | * Negatively instantiate the key with the given timeout (in seconds) and link |
1134 | * the key into the destination keyring if one is given. | |
1135 | * | |
1136 | * The caller must have the appropriate instantiation permit set for this to | |
1137 | * work (see keyctl_assume_authority). No other permissions are required. | |
1138 | * | |
1139 | * The key and any links to the key will be automatically garbage collected | |
1140 | * after the timeout expires. | |
1141 | * | |
1142 | * Negative keys are used to rate limit repeated request_key() calls by causing | |
1143 | * them to return -ENOKEY until the negative key expires. | |
1144 | * | |
1145 | * If successful, 0 will be returned. | |
1da177e4 LT |
1146 | */ |
1147 | long keyctl_negate_key(key_serial_t id, unsigned timeout, key_serial_t ringid) | |
fdd1b945 DH |
1148 | { |
1149 | return keyctl_reject_key(id, timeout, ENOKEY, ringid); | |
1150 | } | |
1151 | ||
1152 | /* | |
1153 | * Negatively instantiate the key with the given timeout (in seconds) and error | |
1154 | * code and link the key into the destination keyring if one is given. | |
1155 | * | |
1156 | * The caller must have the appropriate instantiation permit set for this to | |
1157 | * work (see keyctl_assume_authority). No other permissions are required. | |
1158 | * | |
1159 | * The key and any links to the key will be automatically garbage collected | |
1160 | * after the timeout expires. | |
1161 | * | |
1162 | * Negative keys are used to rate limit repeated request_key() calls by causing | |
1163 | * them to return the specified error code until the negative key expires. | |
1164 | * | |
1165 | * If successful, 0 will be returned. | |
1166 | */ | |
1167 | long keyctl_reject_key(key_serial_t id, unsigned timeout, unsigned error, | |
1168 | key_serial_t ringid) | |
1da177e4 | 1169 | { |
d84f4f99 | 1170 | const struct cred *cred = current_cred(); |
3e30148c | 1171 | struct request_key_auth *rka; |
8bbf4976 | 1172 | struct key *instkey, *dest_keyring; |
1da177e4 LT |
1173 | long ret; |
1174 | ||
fdd1b945 DH |
1175 | kenter("%d,%u,%u,%d", id, timeout, error, ringid); |
1176 | ||
1177 | /* must be a valid error code and mustn't be a kernel special */ | |
1178 | if (error <= 0 || | |
1179 | error >= MAX_ERRNO || | |
1180 | error == ERESTARTSYS || | |
1181 | error == ERESTARTNOINTR || | |
1182 | error == ERESTARTNOHAND || | |
1183 | error == ERESTART_RESTARTBLOCK) | |
1184 | return -EINVAL; | |
d84f4f99 | 1185 | |
b5f545c8 DH |
1186 | /* the appropriate instantiation authorisation key must have been |
1187 | * assumed before calling this */ | |
1188 | ret = -EPERM; | |
d84f4f99 | 1189 | instkey = cred->request_key_auth; |
b5f545c8 | 1190 | if (!instkey) |
1da177e4 | 1191 | goto error; |
1da177e4 | 1192 | |
3e30148c | 1193 | rka = instkey->payload.data; |
b5f545c8 DH |
1194 | if (rka->target_key->serial != id) |
1195 | goto error; | |
3e30148c | 1196 | |
1da177e4 LT |
1197 | /* find the destination keyring if present (which must also be |
1198 | * writable) */ | |
8bbf4976 DH |
1199 | ret = get_instantiation_keyring(ringid, rka, &dest_keyring); |
1200 | if (ret < 0) | |
1201 | goto error; | |
1da177e4 LT |
1202 | |
1203 | /* instantiate the key and link it into a keyring */ | |
fdd1b945 | 1204 | ret = key_reject_and_link(rka->target_key, timeout, error, |
8bbf4976 | 1205 | dest_keyring, instkey); |
1da177e4 | 1206 | |
8bbf4976 | 1207 | key_put(dest_keyring); |
b5f545c8 DH |
1208 | |
1209 | /* discard the assumed authority if it's just been disabled by | |
1210 | * instantiation of the key */ | |
d84f4f99 DH |
1211 | if (ret == 0) |
1212 | keyctl_change_reqkey_auth(NULL); | |
b5f545c8 DH |
1213 | |
1214 | error: | |
1da177e4 | 1215 | return ret; |
a8b17ed0 | 1216 | } |
1da177e4 | 1217 | |
3e30148c | 1218 | /* |
973c9f4f DH |
1219 | * Read or set the default keyring in which request_key() will cache keys and |
1220 | * return the old setting. | |
1221 | * | |
1222 | * If a process keyring is specified then this will be created if it doesn't | |
1223 | * yet exist. The old setting will be returned if successful. | |
3e30148c DH |
1224 | */ |
1225 | long keyctl_set_reqkey_keyring(int reqkey_defl) | |
1226 | { | |
d84f4f99 DH |
1227 | struct cred *new; |
1228 | int ret, old_setting; | |
1229 | ||
1230 | old_setting = current_cred_xxx(jit_keyring); | |
1231 | ||
1232 | if (reqkey_defl == KEY_REQKEY_DEFL_NO_CHANGE) | |
1233 | return old_setting; | |
1234 | ||
1235 | new = prepare_creds(); | |
1236 | if (!new) | |
1237 | return -ENOMEM; | |
3e30148c DH |
1238 | |
1239 | switch (reqkey_defl) { | |
1240 | case KEY_REQKEY_DEFL_THREAD_KEYRING: | |
d84f4f99 | 1241 | ret = install_thread_keyring_to_cred(new); |
3e30148c | 1242 | if (ret < 0) |
d84f4f99 | 1243 | goto error; |
3e30148c DH |
1244 | goto set; |
1245 | ||
1246 | case KEY_REQKEY_DEFL_PROCESS_KEYRING: | |
d84f4f99 DH |
1247 | ret = install_process_keyring_to_cred(new); |
1248 | if (ret < 0) { | |
1249 | if (ret != -EEXIST) | |
1250 | goto error; | |
1251 | ret = 0; | |
1252 | } | |
1253 | goto set; | |
3e30148c DH |
1254 | |
1255 | case KEY_REQKEY_DEFL_DEFAULT: | |
1256 | case KEY_REQKEY_DEFL_SESSION_KEYRING: | |
1257 | case KEY_REQKEY_DEFL_USER_KEYRING: | |
1258 | case KEY_REQKEY_DEFL_USER_SESSION_KEYRING: | |
d84f4f99 DH |
1259 | case KEY_REQKEY_DEFL_REQUESTOR_KEYRING: |
1260 | goto set; | |
3e30148c DH |
1261 | |
1262 | case KEY_REQKEY_DEFL_NO_CHANGE: | |
3e30148c DH |
1263 | case KEY_REQKEY_DEFL_GROUP_KEYRING: |
1264 | default: | |
d84f4f99 DH |
1265 | ret = -EINVAL; |
1266 | goto error; | |
3e30148c DH |
1267 | } |
1268 | ||
d84f4f99 DH |
1269 | set: |
1270 | new->jit_keyring = reqkey_defl; | |
1271 | commit_creds(new); | |
1272 | return old_setting; | |
1273 | error: | |
1274 | abort_creds(new); | |
4303ef19 | 1275 | return ret; |
a8b17ed0 | 1276 | } |
d84f4f99 | 1277 | |
017679c4 | 1278 | /* |
973c9f4f DH |
1279 | * Set or clear the timeout on a key. |
1280 | * | |
1281 | * Either the key must grant the caller Setattr permission or else the caller | |
1282 | * must hold an instantiation authorisation token for the key. | |
1283 | * | |
1284 | * The timeout is either 0 to clear the timeout, or a number of seconds from | |
1285 | * the current time. The key and any links to the key will be automatically | |
1286 | * garbage collected after the timeout expires. | |
1287 | * | |
1288 | * If successful, 0 is returned. | |
017679c4 DH |
1289 | */ |
1290 | long keyctl_set_timeout(key_serial_t id, unsigned timeout) | |
1291 | { | |
9156235b | 1292 | struct key *key, *instkey; |
017679c4 | 1293 | key_ref_t key_ref; |
017679c4 DH |
1294 | long ret; |
1295 | ||
5593122e DH |
1296 | key_ref = lookup_user_key(id, KEY_LOOKUP_CREATE | KEY_LOOKUP_PARTIAL, |
1297 | KEY_SETATTR); | |
017679c4 | 1298 | if (IS_ERR(key_ref)) { |
9156235b DH |
1299 | /* setting the timeout on a key under construction is permitted |
1300 | * if we have the authorisation token handy */ | |
1301 | if (PTR_ERR(key_ref) == -EACCES) { | |
1302 | instkey = key_get_instantiation_authkey(id); | |
1303 | if (!IS_ERR(instkey)) { | |
1304 | key_put(instkey); | |
1305 | key_ref = lookup_user_key(id, | |
1306 | KEY_LOOKUP_PARTIAL, | |
1307 | 0); | |
1308 | if (!IS_ERR(key_ref)) | |
1309 | goto okay; | |
1310 | } | |
1311 | } | |
1312 | ||
017679c4 DH |
1313 | ret = PTR_ERR(key_ref); |
1314 | goto error; | |
1315 | } | |
1316 | ||
9156235b | 1317 | okay: |
017679c4 | 1318 | key = key_ref_to_ptr(key_ref); |
59e6b9c1 | 1319 | key_set_timeout(key, timeout); |
017679c4 DH |
1320 | key_put(key); |
1321 | ||
1322 | ret = 0; | |
1323 | error: | |
1324 | return ret; | |
a8b17ed0 | 1325 | } |
017679c4 | 1326 | |
b5f545c8 | 1327 | /* |
973c9f4f DH |
1328 | * Assume (or clear) the authority to instantiate the specified key. |
1329 | * | |
1330 | * This sets the authoritative token currently in force for key instantiation. | |
1331 | * This must be done for a key to be instantiated. It has the effect of making | |
1332 | * available all the keys from the caller of the request_key() that created a | |
1333 | * key to request_key() calls made by the caller of this function. | |
1334 | * | |
1335 | * The caller must have the instantiation key in their process keyrings with a | |
1336 | * Search permission grant available to the caller. | |
1337 | * | |
1338 | * If the ID given is 0, then the setting will be cleared and 0 returned. | |
1339 | * | |
1340 | * If the ID given has a matching an authorisation key, then that key will be | |
1341 | * set and its ID will be returned. The authorisation key can be read to get | |
1342 | * the callout information passed to request_key(). | |
b5f545c8 DH |
1343 | */ |
1344 | long keyctl_assume_authority(key_serial_t id) | |
1345 | { | |
1346 | struct key *authkey; | |
1347 | long ret; | |
1348 | ||
1349 | /* special key IDs aren't permitted */ | |
1350 | ret = -EINVAL; | |
1351 | if (id < 0) | |
1352 | goto error; | |
1353 | ||
1354 | /* we divest ourselves of authority if given an ID of 0 */ | |
1355 | if (id == 0) { | |
d84f4f99 | 1356 | ret = keyctl_change_reqkey_auth(NULL); |
b5f545c8 DH |
1357 | goto error; |
1358 | } | |
1359 | ||
1360 | /* attempt to assume the authority temporarily granted to us whilst we | |
1361 | * instantiate the specified key | |
1362 | * - the authorisation key must be in the current task's keyrings | |
1363 | * somewhere | |
1364 | */ | |
1365 | authkey = key_get_instantiation_authkey(id); | |
1366 | if (IS_ERR(authkey)) { | |
1367 | ret = PTR_ERR(authkey); | |
1368 | goto error; | |
1369 | } | |
1370 | ||
d84f4f99 DH |
1371 | ret = keyctl_change_reqkey_auth(authkey); |
1372 | if (ret < 0) | |
1373 | goto error; | |
1374 | key_put(authkey); | |
b5f545c8 | 1375 | |
d84f4f99 | 1376 | ret = authkey->serial; |
b5f545c8 DH |
1377 | error: |
1378 | return ret; | |
a8b17ed0 | 1379 | } |
b5f545c8 | 1380 | |
70a5bb72 | 1381 | /* |
973c9f4f DH |
1382 | * Get a key's the LSM security label. |
1383 | * | |
1384 | * The key must grant the caller View permission for this to work. | |
1385 | * | |
1386 | * If there's a buffer, then up to buflen bytes of data will be placed into it. | |
1387 | * | |
1388 | * If successful, the amount of information available will be returned, | |
1389 | * irrespective of how much was copied (including the terminal NUL). | |
70a5bb72 DH |
1390 | */ |
1391 | long keyctl_get_security(key_serial_t keyid, | |
1392 | char __user *buffer, | |
1393 | size_t buflen) | |
1394 | { | |
1395 | struct key *key, *instkey; | |
1396 | key_ref_t key_ref; | |
1397 | char *context; | |
1398 | long ret; | |
1399 | ||
5593122e | 1400 | key_ref = lookup_user_key(keyid, KEY_LOOKUP_PARTIAL, KEY_VIEW); |
70a5bb72 DH |
1401 | if (IS_ERR(key_ref)) { |
1402 | if (PTR_ERR(key_ref) != -EACCES) | |
1403 | return PTR_ERR(key_ref); | |
1404 | ||
1405 | /* viewing a key under construction is also permitted if we | |
1406 | * have the authorisation token handy */ | |
1407 | instkey = key_get_instantiation_authkey(keyid); | |
1408 | if (IS_ERR(instkey)) | |
fa1cc7b5 | 1409 | return PTR_ERR(instkey); |
70a5bb72 DH |
1410 | key_put(instkey); |
1411 | ||
5593122e | 1412 | key_ref = lookup_user_key(keyid, KEY_LOOKUP_PARTIAL, 0); |
70a5bb72 DH |
1413 | if (IS_ERR(key_ref)) |
1414 | return PTR_ERR(key_ref); | |
1415 | } | |
1416 | ||
1417 | key = key_ref_to_ptr(key_ref); | |
1418 | ret = security_key_getsecurity(key, &context); | |
1419 | if (ret == 0) { | |
1420 | /* if no information was returned, give userspace an empty | |
1421 | * string */ | |
1422 | ret = 1; | |
1423 | if (buffer && buflen > 0 && | |
1424 | copy_to_user(buffer, "", 1) != 0) | |
1425 | ret = -EFAULT; | |
1426 | } else if (ret > 0) { | |
1427 | /* return as much data as there's room for */ | |
1428 | if (buffer && buflen > 0) { | |
1429 | if (buflen > ret) | |
1430 | buflen = ret; | |
1431 | ||
1432 | if (copy_to_user(buffer, context, buflen) != 0) | |
1433 | ret = -EFAULT; | |
1434 | } | |
1435 | ||
1436 | kfree(context); | |
1437 | } | |
1438 | ||
1439 | key_ref_put(key_ref); | |
1440 | return ret; | |
1441 | } | |
1442 | ||
ee18d64c | 1443 | /* |
973c9f4f DH |
1444 | * Attempt to install the calling process's session keyring on the process's |
1445 | * parent process. | |
1446 | * | |
1447 | * The keyring must exist and must grant the caller LINK permission, and the | |
1448 | * parent process must be single-threaded and must have the same effective | |
1449 | * ownership as this process and mustn't be SUID/SGID. | |
1450 | * | |
1451 | * The keyring will be emplaced on the parent when it next resumes userspace. | |
1452 | * | |
1453 | * If successful, 0 will be returned. | |
ee18d64c DH |
1454 | */ |
1455 | long keyctl_session_to_parent(void) | |
1456 | { | |
a00ae4d2 | 1457 | #ifdef TIF_NOTIFY_RESUME |
ee18d64c DH |
1458 | struct task_struct *me, *parent; |
1459 | const struct cred *mycred, *pcred; | |
1460 | struct cred *cred, *oldcred; | |
1461 | key_ref_t keyring_r; | |
1462 | int ret; | |
1463 | ||
1464 | keyring_r = lookup_user_key(KEY_SPEC_SESSION_KEYRING, 0, KEY_LINK); | |
1465 | if (IS_ERR(keyring_r)) | |
1466 | return PTR_ERR(keyring_r); | |
1467 | ||
1468 | /* our parent is going to need a new cred struct, a new tgcred struct | |
1469 | * and new security data, so we allocate them here to prevent ENOMEM in | |
1470 | * our parent */ | |
1471 | ret = -ENOMEM; | |
1472 | cred = cred_alloc_blank(); | |
1473 | if (!cred) | |
1474 | goto error_keyring; | |
1475 | ||
1476 | cred->tgcred->session_keyring = key_ref_to_ptr(keyring_r); | |
1477 | keyring_r = NULL; | |
1478 | ||
1479 | me = current; | |
9d1ac65a | 1480 | rcu_read_lock(); |
ee18d64c DH |
1481 | write_lock_irq(&tasklist_lock); |
1482 | ||
1483 | parent = me->real_parent; | |
1484 | ret = -EPERM; | |
1485 | ||
1486 | /* the parent mustn't be init and mustn't be a kernel thread */ | |
1487 | if (parent->pid <= 1 || !parent->mm) | |
1488 | goto not_permitted; | |
1489 | ||
1490 | /* the parent must be single threaded */ | |
dd98acf7 | 1491 | if (!thread_group_empty(parent)) |
ee18d64c DH |
1492 | goto not_permitted; |
1493 | ||
1494 | /* the parent and the child must have different session keyrings or | |
1495 | * there's no point */ | |
1496 | mycred = current_cred(); | |
1497 | pcred = __task_cred(parent); | |
1498 | if (mycred == pcred || | |
1499 | mycred->tgcred->session_keyring == pcred->tgcred->session_keyring) | |
1500 | goto already_same; | |
1501 | ||
1502 | /* the parent must have the same effective ownership and mustn't be | |
1503 | * SUID/SGID */ | |
c5b60b5e | 1504 | if (pcred->uid != mycred->euid || |
ee18d64c DH |
1505 | pcred->euid != mycred->euid || |
1506 | pcred->suid != mycred->euid || | |
c5b60b5e | 1507 | pcred->gid != mycred->egid || |
ee18d64c DH |
1508 | pcred->egid != mycred->egid || |
1509 | pcred->sgid != mycred->egid) | |
1510 | goto not_permitted; | |
1511 | ||
1512 | /* the keyrings must have the same UID */ | |
3d96406c DH |
1513 | if ((pcred->tgcred->session_keyring && |
1514 | pcred->tgcred->session_keyring->uid != mycred->euid) || | |
ee18d64c DH |
1515 | mycred->tgcred->session_keyring->uid != mycred->euid) |
1516 | goto not_permitted; | |
1517 | ||
ee18d64c DH |
1518 | /* if there's an already pending keyring replacement, then we replace |
1519 | * that */ | |
1520 | oldcred = parent->replacement_session_keyring; | |
1521 | ||
1522 | /* the replacement session keyring is applied just prior to userspace | |
1523 | * restarting */ | |
1524 | parent->replacement_session_keyring = cred; | |
1525 | cred = NULL; | |
1526 | set_ti_thread_flag(task_thread_info(parent), TIF_NOTIFY_RESUME); | |
1527 | ||
1528 | write_unlock_irq(&tasklist_lock); | |
9d1ac65a | 1529 | rcu_read_unlock(); |
ee18d64c DH |
1530 | if (oldcred) |
1531 | put_cred(oldcred); | |
1532 | return 0; | |
1533 | ||
1534 | already_same: | |
1535 | ret = 0; | |
1536 | not_permitted: | |
5c84342a | 1537 | write_unlock_irq(&tasklist_lock); |
9d1ac65a | 1538 | rcu_read_unlock(); |
ee18d64c DH |
1539 | put_cred(cred); |
1540 | return ret; | |
1541 | ||
1542 | error_keyring: | |
1543 | key_ref_put(keyring_r); | |
1544 | return ret; | |
a00ae4d2 GU |
1545 | |
1546 | #else /* !TIF_NOTIFY_RESUME */ | |
1547 | /* | |
1548 | * To be removed when TIF_NOTIFY_RESUME has been implemented on | |
1549 | * m68k/xtensa | |
1550 | */ | |
1551 | #warning TIF_NOTIFY_RESUME not implemented | |
1552 | return -EOPNOTSUPP; | |
1553 | #endif /* !TIF_NOTIFY_RESUME */ | |
ee18d64c DH |
1554 | } |
1555 | ||
1da177e4 | 1556 | /* |
973c9f4f | 1557 | * The key control system call |
1da177e4 | 1558 | */ |
938bb9f5 HC |
1559 | SYSCALL_DEFINE5(keyctl, int, option, unsigned long, arg2, unsigned long, arg3, |
1560 | unsigned long, arg4, unsigned long, arg5) | |
1da177e4 LT |
1561 | { |
1562 | switch (option) { | |
1563 | case KEYCTL_GET_KEYRING_ID: | |
1564 | return keyctl_get_keyring_ID((key_serial_t) arg2, | |
1565 | (int) arg3); | |
1566 | ||
1567 | case KEYCTL_JOIN_SESSION_KEYRING: | |
1568 | return keyctl_join_session_keyring((const char __user *) arg2); | |
1569 | ||
1570 | case KEYCTL_UPDATE: | |
1571 | return keyctl_update_key((key_serial_t) arg2, | |
1572 | (const void __user *) arg3, | |
1573 | (size_t) arg4); | |
1574 | ||
1575 | case KEYCTL_REVOKE: | |
1576 | return keyctl_revoke_key((key_serial_t) arg2); | |
1577 | ||
1578 | case KEYCTL_DESCRIBE: | |
1579 | return keyctl_describe_key((key_serial_t) arg2, | |
1580 | (char __user *) arg3, | |
1581 | (unsigned) arg4); | |
1582 | ||
1583 | case KEYCTL_CLEAR: | |
1584 | return keyctl_keyring_clear((key_serial_t) arg2); | |
1585 | ||
1586 | case KEYCTL_LINK: | |
1587 | return keyctl_keyring_link((key_serial_t) arg2, | |
1588 | (key_serial_t) arg3); | |
1589 | ||
1590 | case KEYCTL_UNLINK: | |
1591 | return keyctl_keyring_unlink((key_serial_t) arg2, | |
1592 | (key_serial_t) arg3); | |
1593 | ||
1594 | case KEYCTL_SEARCH: | |
1595 | return keyctl_keyring_search((key_serial_t) arg2, | |
1596 | (const char __user *) arg3, | |
1597 | (const char __user *) arg4, | |
1598 | (key_serial_t) arg5); | |
1599 | ||
1600 | case KEYCTL_READ: | |
1601 | return keyctl_read_key((key_serial_t) arg2, | |
1602 | (char __user *) arg3, | |
1603 | (size_t) arg4); | |
1604 | ||
1605 | case KEYCTL_CHOWN: | |
1606 | return keyctl_chown_key((key_serial_t) arg2, | |
1607 | (uid_t) arg3, | |
1608 | (gid_t) arg4); | |
1609 | ||
1610 | case KEYCTL_SETPERM: | |
1611 | return keyctl_setperm_key((key_serial_t) arg2, | |
1612 | (key_perm_t) arg3); | |
1613 | ||
1614 | case KEYCTL_INSTANTIATE: | |
1615 | return keyctl_instantiate_key((key_serial_t) arg2, | |
1616 | (const void __user *) arg3, | |
1617 | (size_t) arg4, | |
1618 | (key_serial_t) arg5); | |
1619 | ||
1620 | case KEYCTL_NEGATE: | |
1621 | return keyctl_negate_key((key_serial_t) arg2, | |
1622 | (unsigned) arg3, | |
1623 | (key_serial_t) arg4); | |
1624 | ||
3e30148c DH |
1625 | case KEYCTL_SET_REQKEY_KEYRING: |
1626 | return keyctl_set_reqkey_keyring(arg2); | |
1627 | ||
017679c4 DH |
1628 | case KEYCTL_SET_TIMEOUT: |
1629 | return keyctl_set_timeout((key_serial_t) arg2, | |
1630 | (unsigned) arg3); | |
1631 | ||
b5f545c8 DH |
1632 | case KEYCTL_ASSUME_AUTHORITY: |
1633 | return keyctl_assume_authority((key_serial_t) arg2); | |
1634 | ||
70a5bb72 DH |
1635 | case KEYCTL_GET_SECURITY: |
1636 | return keyctl_get_security((key_serial_t) arg2, | |
90bd49ab | 1637 | (char __user *) arg3, |
70a5bb72 DH |
1638 | (size_t) arg4); |
1639 | ||
ee18d64c DH |
1640 | case KEYCTL_SESSION_TO_PARENT: |
1641 | return keyctl_session_to_parent(); | |
1642 | ||
fdd1b945 DH |
1643 | case KEYCTL_REJECT: |
1644 | return keyctl_reject_key((key_serial_t) arg2, | |
1645 | (unsigned) arg3, | |
1646 | (unsigned) arg4, | |
1647 | (key_serial_t) arg5); | |
1648 | ||
ee009e4a DH |
1649 | case KEYCTL_INSTANTIATE_IOV: |
1650 | return keyctl_instantiate_key_iov( | |
1651 | (key_serial_t) arg2, | |
1652 | (const struct iovec __user *) arg3, | |
1653 | (unsigned) arg4, | |
1654 | (key_serial_t) arg5); | |
1655 | ||
fd75815f DH |
1656 | case KEYCTL_INVALIDATE: |
1657 | return keyctl_invalidate_key((key_serial_t) arg2); | |
1658 | ||
1da177e4 LT |
1659 | default: |
1660 | return -EOPNOTSUPP; | |
1661 | } | |
a8b17ed0 | 1662 | } |