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 | * | |
cf7f601c DH |
49 | * If the description is NULL or an empty string, the key type is asked to |
50 | * generate one from the payload. | |
51 | * | |
973c9f4f DH |
52 | * The keyring must be writable so that we can attach the key to it. |
53 | * | |
54 | * If successful, the new key's serial number is returned, otherwise an error | |
55 | * code is returned. | |
1da177e4 | 56 | */ |
1e7bfb21 HC |
57 | SYSCALL_DEFINE5(add_key, const char __user *, _type, |
58 | const char __user *, _description, | |
59 | const void __user *, _payload, | |
60 | size_t, plen, | |
61 | key_serial_t, ringid) | |
1da177e4 | 62 | { |
664cceb0 | 63 | key_ref_t keyring_ref, key_ref; |
1da177e4 LT |
64 | char type[32], *description; |
65 | void *payload; | |
0cb409d9 | 66 | long ret; |
38bbca6b | 67 | bool vm; |
1da177e4 LT |
68 | |
69 | ret = -EINVAL; | |
38bbca6b | 70 | if (plen > 1024 * 1024 - 1) |
1da177e4 LT |
71 | goto error; |
72 | ||
73 | /* draw all the data into kernel space */ | |
0cb409d9 | 74 | ret = key_get_type_from_user(type, _type, sizeof(type)); |
1da177e4 LT |
75 | if (ret < 0) |
76 | goto error; | |
1da177e4 | 77 | |
cf7f601c DH |
78 | description = NULL; |
79 | if (_description) { | |
80 | description = strndup_user(_description, PAGE_SIZE); | |
81 | if (IS_ERR(description)) { | |
82 | ret = PTR_ERR(description); | |
83 | goto error; | |
84 | } | |
85 | if (!*description) { | |
86 | kfree(description); | |
87 | description = NULL; | |
88 | } | |
0cb409d9 | 89 | } |
1da177e4 LT |
90 | |
91 | /* pull the payload in if one was supplied */ | |
92 | payload = NULL; | |
93 | ||
38bbca6b | 94 | vm = false; |
1da177e4 LT |
95 | if (_payload) { |
96 | ret = -ENOMEM; | |
4f1c28d2 | 97 | payload = kmalloc(plen, GFP_KERNEL | __GFP_NOWARN); |
38bbca6b DH |
98 | if (!payload) { |
99 | if (plen <= PAGE_SIZE) | |
100 | goto error2; | |
101 | vm = true; | |
102 | payload = vmalloc(plen); | |
103 | if (!payload) | |
104 | goto error2; | |
105 | } | |
1da177e4 LT |
106 | |
107 | ret = -EFAULT; | |
108 | if (copy_from_user(payload, _payload, plen) != 0) | |
109 | goto error3; | |
110 | } | |
111 | ||
112 | /* find the target keyring (which must be writable) */ | |
5593122e | 113 | keyring_ref = lookup_user_key(ringid, KEY_LOOKUP_CREATE, KEY_WRITE); |
664cceb0 DH |
114 | if (IS_ERR(keyring_ref)) { |
115 | ret = PTR_ERR(keyring_ref); | |
1da177e4 LT |
116 | goto error3; |
117 | } | |
118 | ||
119 | /* create or update the requested key and add it to the target | |
120 | * keyring */ | |
664cceb0 | 121 | key_ref = key_create_or_update(keyring_ref, type, description, |
6b79ccb5 AR |
122 | payload, plen, KEY_PERM_UNDEF, |
123 | KEY_ALLOC_IN_QUOTA); | |
664cceb0 DH |
124 | if (!IS_ERR(key_ref)) { |
125 | ret = key_ref_to_ptr(key_ref)->serial; | |
126 | key_ref_put(key_ref); | |
1da177e4 LT |
127 | } |
128 | else { | |
664cceb0 | 129 | ret = PTR_ERR(key_ref); |
1da177e4 LT |
130 | } |
131 | ||
664cceb0 | 132 | key_ref_put(keyring_ref); |
1da177e4 | 133 | error3: |
38bbca6b DH |
134 | if (!vm) |
135 | kfree(payload); | |
136 | else | |
137 | vfree(payload); | |
1da177e4 LT |
138 | error2: |
139 | kfree(description); | |
140 | error: | |
141 | return ret; | |
a8b17ed0 | 142 | } |
1da177e4 | 143 | |
1da177e4 | 144 | /* |
973c9f4f DH |
145 | * Search the process keyrings and keyring trees linked from those for a |
146 | * matching key. Keyrings must have appropriate Search permission to be | |
147 | * searched. | |
148 | * | |
149 | * If a key is found, it will be attached to the destination keyring if there's | |
150 | * one specified and the serial number of the key will be returned. | |
151 | * | |
152 | * If no key is found, /sbin/request-key will be invoked if _callout_info is | |
153 | * non-NULL in an attempt to create a key. The _callout_info string will be | |
154 | * passed to /sbin/request-key to aid with completing the request. If the | |
155 | * _callout_info string is "" then it will be changed to "-". | |
1da177e4 | 156 | */ |
1e7bfb21 HC |
157 | SYSCALL_DEFINE4(request_key, const char __user *, _type, |
158 | const char __user *, _description, | |
159 | const char __user *, _callout_info, | |
160 | key_serial_t, destringid) | |
1da177e4 LT |
161 | { |
162 | struct key_type *ktype; | |
664cceb0 DH |
163 | struct key *key; |
164 | key_ref_t dest_ref; | |
4a38e122 | 165 | size_t callout_len; |
1da177e4 | 166 | char type[32], *description, *callout_info; |
0cb409d9 | 167 | long ret; |
1da177e4 LT |
168 | |
169 | /* pull the type into kernel space */ | |
0cb409d9 | 170 | ret = key_get_type_from_user(type, _type, sizeof(type)); |
1da177e4 LT |
171 | if (ret < 0) |
172 | goto error; | |
1260f801 | 173 | |
1da177e4 | 174 | /* pull the description into kernel space */ |
0cb409d9 DA |
175 | description = strndup_user(_description, PAGE_SIZE); |
176 | if (IS_ERR(description)) { | |
177 | ret = PTR_ERR(description); | |
1da177e4 | 178 | goto error; |
0cb409d9 | 179 | } |
1da177e4 LT |
180 | |
181 | /* pull the callout info into kernel space */ | |
182 | callout_info = NULL; | |
4a38e122 | 183 | callout_len = 0; |
1da177e4 | 184 | if (_callout_info) { |
0cb409d9 DA |
185 | callout_info = strndup_user(_callout_info, PAGE_SIZE); |
186 | if (IS_ERR(callout_info)) { | |
187 | ret = PTR_ERR(callout_info); | |
1da177e4 | 188 | goto error2; |
0cb409d9 | 189 | } |
4a38e122 | 190 | callout_len = strlen(callout_info); |
1da177e4 LT |
191 | } |
192 | ||
193 | /* get the destination keyring if specified */ | |
664cceb0 | 194 | dest_ref = NULL; |
1da177e4 | 195 | if (destringid) { |
5593122e DH |
196 | dest_ref = lookup_user_key(destringid, KEY_LOOKUP_CREATE, |
197 | KEY_WRITE); | |
664cceb0 DH |
198 | if (IS_ERR(dest_ref)) { |
199 | ret = PTR_ERR(dest_ref); | |
1da177e4 LT |
200 | goto error3; |
201 | } | |
202 | } | |
203 | ||
204 | /* find the key type */ | |
205 | ktype = key_type_lookup(type); | |
206 | if (IS_ERR(ktype)) { | |
207 | ret = PTR_ERR(ktype); | |
208 | goto error4; | |
209 | } | |
210 | ||
211 | /* do the search */ | |
4a38e122 DH |
212 | key = request_key_and_link(ktype, description, callout_info, |
213 | callout_len, NULL, key_ref_to_ptr(dest_ref), | |
7e047ef5 | 214 | KEY_ALLOC_IN_QUOTA); |
1da177e4 LT |
215 | if (IS_ERR(key)) { |
216 | ret = PTR_ERR(key); | |
217 | goto error5; | |
218 | } | |
219 | ||
4aab1e89 DH |
220 | /* wait for the key to finish being constructed */ |
221 | ret = wait_for_key_construction(key, 1); | |
222 | if (ret < 0) | |
223 | goto error6; | |
224 | ||
1da177e4 LT |
225 | ret = key->serial; |
226 | ||
4aab1e89 | 227 | error6: |
3e30148c | 228 | key_put(key); |
c5b60b5e | 229 | error5: |
1da177e4 | 230 | key_type_put(ktype); |
c5b60b5e | 231 | error4: |
664cceb0 | 232 | key_ref_put(dest_ref); |
c5b60b5e | 233 | error3: |
1da177e4 | 234 | kfree(callout_info); |
c5b60b5e | 235 | error2: |
1da177e4 | 236 | kfree(description); |
c5b60b5e | 237 | error: |
1da177e4 | 238 | return ret; |
a8b17ed0 | 239 | } |
1da177e4 | 240 | |
1da177e4 | 241 | /* |
973c9f4f DH |
242 | * Get the ID of the specified process keyring. |
243 | * | |
244 | * The requested keyring must have search permission to be found. | |
245 | * | |
246 | * If successful, the ID of the requested keyring will be returned. | |
1da177e4 LT |
247 | */ |
248 | long keyctl_get_keyring_ID(key_serial_t id, int create) | |
249 | { | |
664cceb0 | 250 | key_ref_t key_ref; |
5593122e | 251 | unsigned long lflags; |
1da177e4 LT |
252 | long ret; |
253 | ||
5593122e DH |
254 | lflags = create ? KEY_LOOKUP_CREATE : 0; |
255 | key_ref = lookup_user_key(id, lflags, KEY_SEARCH); | |
664cceb0 DH |
256 | if (IS_ERR(key_ref)) { |
257 | ret = PTR_ERR(key_ref); | |
1da177e4 LT |
258 | goto error; |
259 | } | |
260 | ||
664cceb0 DH |
261 | ret = key_ref_to_ptr(key_ref)->serial; |
262 | key_ref_put(key_ref); | |
c5b60b5e | 263 | error: |
1da177e4 | 264 | return ret; |
973c9f4f | 265 | } |
1da177e4 | 266 | |
1da177e4 | 267 | /* |
973c9f4f DH |
268 | * Join a (named) session keyring. |
269 | * | |
270 | * Create and join an anonymous session keyring or join a named session | |
271 | * keyring, creating it if necessary. A named session keyring must have Search | |
272 | * permission for it to be joined. Session keyrings without this permit will | |
273 | * be skipped over. | |
274 | * | |
275 | * If successful, the ID of the joined session keyring will be returned. | |
1da177e4 LT |
276 | */ |
277 | long keyctl_join_session_keyring(const char __user *_name) | |
278 | { | |
279 | char *name; | |
0cb409d9 | 280 | long ret; |
1da177e4 LT |
281 | |
282 | /* fetch the name from userspace */ | |
283 | name = NULL; | |
284 | if (_name) { | |
0cb409d9 DA |
285 | name = strndup_user(_name, PAGE_SIZE); |
286 | if (IS_ERR(name)) { | |
287 | ret = PTR_ERR(name); | |
1da177e4 | 288 | goto error; |
0cb409d9 | 289 | } |
1da177e4 LT |
290 | } |
291 | ||
292 | /* join the session */ | |
293 | ret = join_session_keyring(name); | |
0d54ee1c | 294 | kfree(name); |
1da177e4 | 295 | |
c5b60b5e | 296 | error: |
1da177e4 | 297 | return ret; |
a8b17ed0 | 298 | } |
1da177e4 | 299 | |
1da177e4 | 300 | /* |
973c9f4f DH |
301 | * Update a key's data payload from the given data. |
302 | * | |
303 | * The key must grant the caller Write permission and the key type must support | |
304 | * updating for this to work. A negative key can be positively instantiated | |
305 | * with this call. | |
306 | * | |
307 | * If successful, 0 will be returned. If the key type does not support | |
308 | * updating, then -EOPNOTSUPP will be returned. | |
1da177e4 LT |
309 | */ |
310 | long keyctl_update_key(key_serial_t id, | |
311 | const void __user *_payload, | |
312 | size_t plen) | |
313 | { | |
664cceb0 | 314 | key_ref_t key_ref; |
1da177e4 LT |
315 | void *payload; |
316 | long ret; | |
317 | ||
318 | ret = -EINVAL; | |
319 | if (plen > PAGE_SIZE) | |
320 | goto error; | |
321 | ||
322 | /* pull the payload in if one was supplied */ | |
323 | payload = NULL; | |
324 | if (_payload) { | |
325 | ret = -ENOMEM; | |
326 | payload = kmalloc(plen, GFP_KERNEL); | |
327 | if (!payload) | |
328 | goto error; | |
329 | ||
330 | ret = -EFAULT; | |
331 | if (copy_from_user(payload, _payload, plen) != 0) | |
332 | goto error2; | |
333 | } | |
334 | ||
335 | /* find the target key (which must be writable) */ | |
5593122e | 336 | key_ref = lookup_user_key(id, 0, KEY_WRITE); |
664cceb0 DH |
337 | if (IS_ERR(key_ref)) { |
338 | ret = PTR_ERR(key_ref); | |
1da177e4 LT |
339 | goto error2; |
340 | } | |
341 | ||
342 | /* update the key */ | |
664cceb0 | 343 | ret = key_update(key_ref, payload, plen); |
1da177e4 | 344 | |
664cceb0 | 345 | key_ref_put(key_ref); |
c5b60b5e | 346 | error2: |
1da177e4 | 347 | kfree(payload); |
c5b60b5e | 348 | error: |
1da177e4 | 349 | return ret; |
a8b17ed0 | 350 | } |
1da177e4 | 351 | |
1da177e4 | 352 | /* |
973c9f4f DH |
353 | * Revoke a key. |
354 | * | |
355 | * The key must be grant the caller Write or Setattr permission for this to | |
356 | * work. The key type should give up its quota claim when revoked. The key | |
357 | * and any links to the key will be automatically garbage collected after a | |
358 | * certain amount of time (/proc/sys/kernel/keys/gc_delay). | |
359 | * | |
360 | * If successful, 0 is returned. | |
1da177e4 LT |
361 | */ |
362 | long keyctl_revoke_key(key_serial_t id) | |
363 | { | |
664cceb0 | 364 | key_ref_t key_ref; |
1da177e4 LT |
365 | long ret; |
366 | ||
5593122e | 367 | key_ref = lookup_user_key(id, 0, KEY_WRITE); |
664cceb0 DH |
368 | if (IS_ERR(key_ref)) { |
369 | ret = PTR_ERR(key_ref); | |
0c2c9a3f DH |
370 | if (ret != -EACCES) |
371 | goto error; | |
372 | key_ref = lookup_user_key(id, 0, KEY_SETATTR); | |
373 | if (IS_ERR(key_ref)) { | |
374 | ret = PTR_ERR(key_ref); | |
375 | goto error; | |
376 | } | |
1da177e4 LT |
377 | } |
378 | ||
664cceb0 | 379 | key_revoke(key_ref_to_ptr(key_ref)); |
1da177e4 LT |
380 | ret = 0; |
381 | ||
664cceb0 | 382 | key_ref_put(key_ref); |
c5b60b5e | 383 | error: |
1260f801 | 384 | return ret; |
a8b17ed0 | 385 | } |
1da177e4 | 386 | |
fd75815f DH |
387 | /* |
388 | * Invalidate a key. | |
389 | * | |
390 | * The key must be grant the caller Invalidate permission for this to work. | |
391 | * The key and any links to the key will be automatically garbage collected | |
392 | * immediately. | |
393 | * | |
394 | * If successful, 0 is returned. | |
395 | */ | |
396 | long keyctl_invalidate_key(key_serial_t id) | |
397 | { | |
398 | key_ref_t key_ref; | |
399 | long ret; | |
400 | ||
401 | kenter("%d", id); | |
402 | ||
403 | key_ref = lookup_user_key(id, 0, KEY_SEARCH); | |
404 | if (IS_ERR(key_ref)) { | |
405 | ret = PTR_ERR(key_ref); | |
406 | goto error; | |
407 | } | |
408 | ||
409 | key_invalidate(key_ref_to_ptr(key_ref)); | |
410 | ret = 0; | |
411 | ||
412 | key_ref_put(key_ref); | |
413 | error: | |
414 | kleave(" = %ld", ret); | |
415 | return ret; | |
416 | } | |
417 | ||
1da177e4 | 418 | /* |
973c9f4f DH |
419 | * Clear the specified keyring, creating an empty process keyring if one of the |
420 | * special keyring IDs is used. | |
421 | * | |
422 | * The keyring must grant the caller Write permission for this to work. If | |
423 | * successful, 0 will be returned. | |
1da177e4 LT |
424 | */ |
425 | long keyctl_keyring_clear(key_serial_t ringid) | |
426 | { | |
664cceb0 | 427 | key_ref_t keyring_ref; |
1da177e4 LT |
428 | long ret; |
429 | ||
5593122e | 430 | keyring_ref = lookup_user_key(ringid, KEY_LOOKUP_CREATE, KEY_WRITE); |
664cceb0 DH |
431 | if (IS_ERR(keyring_ref)) { |
432 | ret = PTR_ERR(keyring_ref); | |
700920eb DH |
433 | |
434 | /* Root is permitted to invalidate certain special keyrings */ | |
435 | if (capable(CAP_SYS_ADMIN)) { | |
436 | keyring_ref = lookup_user_key(ringid, 0, 0); | |
437 | if (IS_ERR(keyring_ref)) | |
438 | goto error; | |
439 | if (test_bit(KEY_FLAG_ROOT_CAN_CLEAR, | |
440 | &key_ref_to_ptr(keyring_ref)->flags)) | |
441 | goto clear; | |
442 | goto error_put; | |
443 | } | |
444 | ||
1da177e4 LT |
445 | goto error; |
446 | } | |
447 | ||
700920eb | 448 | clear: |
664cceb0 | 449 | ret = keyring_clear(key_ref_to_ptr(keyring_ref)); |
700920eb | 450 | error_put: |
664cceb0 | 451 | key_ref_put(keyring_ref); |
c5b60b5e | 452 | error: |
1da177e4 | 453 | return ret; |
a8b17ed0 | 454 | } |
1da177e4 | 455 | |
1da177e4 | 456 | /* |
973c9f4f DH |
457 | * Create a link from a keyring to a key if there's no matching key in the |
458 | * keyring, otherwise replace the link to the matching key with a link to the | |
459 | * new key. | |
460 | * | |
461 | * The key must grant the caller Link permission and the the keyring must grant | |
462 | * the caller Write permission. Furthermore, if an additional link is created, | |
463 | * the keyring's quota will be extended. | |
464 | * | |
465 | * If successful, 0 will be returned. | |
1da177e4 LT |
466 | */ |
467 | long keyctl_keyring_link(key_serial_t id, key_serial_t ringid) | |
468 | { | |
664cceb0 | 469 | key_ref_t keyring_ref, key_ref; |
1da177e4 LT |
470 | long ret; |
471 | ||
5593122e | 472 | keyring_ref = lookup_user_key(ringid, KEY_LOOKUP_CREATE, KEY_WRITE); |
664cceb0 DH |
473 | if (IS_ERR(keyring_ref)) { |
474 | ret = PTR_ERR(keyring_ref); | |
1da177e4 LT |
475 | goto error; |
476 | } | |
477 | ||
5593122e | 478 | key_ref = lookup_user_key(id, KEY_LOOKUP_CREATE, KEY_LINK); |
664cceb0 DH |
479 | if (IS_ERR(key_ref)) { |
480 | ret = PTR_ERR(key_ref); | |
1da177e4 LT |
481 | goto error2; |
482 | } | |
483 | ||
664cceb0 | 484 | ret = key_link(key_ref_to_ptr(keyring_ref), key_ref_to_ptr(key_ref)); |
1da177e4 | 485 | |
664cceb0 | 486 | key_ref_put(key_ref); |
c5b60b5e | 487 | error2: |
664cceb0 | 488 | key_ref_put(keyring_ref); |
c5b60b5e | 489 | error: |
1da177e4 | 490 | return ret; |
a8b17ed0 | 491 | } |
1da177e4 | 492 | |
1da177e4 | 493 | /* |
973c9f4f DH |
494 | * Unlink a key from a keyring. |
495 | * | |
496 | * The keyring must grant the caller Write permission for this to work; the key | |
497 | * itself need not grant the caller anything. If the last link to a key is | |
498 | * removed then that key will be scheduled for destruction. | |
499 | * | |
500 | * If successful, 0 will be returned. | |
1da177e4 LT |
501 | */ |
502 | long keyctl_keyring_unlink(key_serial_t id, key_serial_t ringid) | |
503 | { | |
664cceb0 | 504 | key_ref_t keyring_ref, key_ref; |
1da177e4 LT |
505 | long ret; |
506 | ||
5593122e | 507 | keyring_ref = lookup_user_key(ringid, 0, KEY_WRITE); |
664cceb0 DH |
508 | if (IS_ERR(keyring_ref)) { |
509 | ret = PTR_ERR(keyring_ref); | |
1da177e4 LT |
510 | goto error; |
511 | } | |
512 | ||
5593122e | 513 | key_ref = lookup_user_key(id, KEY_LOOKUP_FOR_UNLINK, 0); |
664cceb0 DH |
514 | if (IS_ERR(key_ref)) { |
515 | ret = PTR_ERR(key_ref); | |
1da177e4 LT |
516 | goto error2; |
517 | } | |
518 | ||
664cceb0 | 519 | ret = key_unlink(key_ref_to_ptr(keyring_ref), key_ref_to_ptr(key_ref)); |
1da177e4 | 520 | |
664cceb0 | 521 | key_ref_put(key_ref); |
c5b60b5e | 522 | error2: |
664cceb0 | 523 | key_ref_put(keyring_ref); |
c5b60b5e | 524 | error: |
1da177e4 | 525 | return ret; |
a8b17ed0 | 526 | } |
1da177e4 | 527 | |
1da177e4 | 528 | /* |
973c9f4f DH |
529 | * Return a description of a key to userspace. |
530 | * | |
531 | * The key must grant the caller View permission for this to work. | |
532 | * | |
533 | * If there's a buffer, we place up to buflen bytes of data into it formatted | |
534 | * in the following way: | |
535 | * | |
1da177e4 | 536 | * type;uid;gid;perm;description<NUL> |
973c9f4f DH |
537 | * |
538 | * If successful, we return the amount of description available, irrespective | |
539 | * of how much we may have copied into the buffer. | |
1da177e4 LT |
540 | */ |
541 | long keyctl_describe_key(key_serial_t keyid, | |
542 | char __user *buffer, | |
543 | size_t buflen) | |
544 | { | |
3e30148c | 545 | struct key *key, *instkey; |
664cceb0 | 546 | key_ref_t key_ref; |
1da177e4 LT |
547 | char *tmpbuf; |
548 | long ret; | |
549 | ||
5593122e | 550 | key_ref = lookup_user_key(keyid, KEY_LOOKUP_PARTIAL, KEY_VIEW); |
664cceb0 | 551 | if (IS_ERR(key_ref)) { |
3e30148c DH |
552 | /* viewing a key under construction is permitted if we have the |
553 | * authorisation token handy */ | |
664cceb0 | 554 | if (PTR_ERR(key_ref) == -EACCES) { |
3e30148c DH |
555 | instkey = key_get_instantiation_authkey(keyid); |
556 | if (!IS_ERR(instkey)) { | |
557 | key_put(instkey); | |
8bbf4976 | 558 | key_ref = lookup_user_key(keyid, |
5593122e DH |
559 | KEY_LOOKUP_PARTIAL, |
560 | 0); | |
664cceb0 | 561 | if (!IS_ERR(key_ref)) |
3e30148c DH |
562 | goto okay; |
563 | } | |
564 | } | |
565 | ||
664cceb0 | 566 | ret = PTR_ERR(key_ref); |
1da177e4 LT |
567 | goto error; |
568 | } | |
569 | ||
3e30148c | 570 | okay: |
1da177e4 LT |
571 | /* calculate how much description we're going to return */ |
572 | ret = -ENOMEM; | |
573 | tmpbuf = kmalloc(PAGE_SIZE, GFP_KERNEL); | |
574 | if (!tmpbuf) | |
575 | goto error2; | |
576 | ||
664cceb0 DH |
577 | key = key_ref_to_ptr(key_ref); |
578 | ||
1da177e4 | 579 | ret = snprintf(tmpbuf, PAGE_SIZE - 1, |
664cceb0 | 580 | "%s;%d;%d;%08x;%s", |
94fd8405 | 581 | key->type->name, |
9a56c2db EB |
582 | from_kuid_munged(current_user_ns(), key->uid), |
583 | from_kgid_munged(current_user_ns(), key->gid), | |
94fd8405 DH |
584 | key->perm, |
585 | key->description ?: ""); | |
1da177e4 LT |
586 | |
587 | /* include a NUL char at the end of the data */ | |
588 | if (ret > PAGE_SIZE - 1) | |
589 | ret = PAGE_SIZE - 1; | |
590 | tmpbuf[ret] = 0; | |
591 | ret++; | |
592 | ||
593 | /* consider returning the data */ | |
594 | if (buffer && buflen > 0) { | |
595 | if (buflen > ret) | |
596 | buflen = ret; | |
597 | ||
598 | if (copy_to_user(buffer, tmpbuf, buflen) != 0) | |
599 | ret = -EFAULT; | |
600 | } | |
601 | ||
602 | kfree(tmpbuf); | |
c5b60b5e | 603 | error2: |
664cceb0 | 604 | key_ref_put(key_ref); |
c5b60b5e | 605 | error: |
1da177e4 | 606 | return ret; |
a8b17ed0 | 607 | } |
1da177e4 | 608 | |
1da177e4 | 609 | /* |
973c9f4f DH |
610 | * Search the specified keyring and any keyrings it links to for a matching |
611 | * key. Only keyrings that grant the caller Search permission will be searched | |
612 | * (this includes the starting keyring). Only keys with Search permission can | |
613 | * be found. | |
614 | * | |
615 | * If successful, the found key will be linked to the destination keyring if | |
616 | * supplied and the key has Link permission, and the found key ID will be | |
617 | * returned. | |
1da177e4 LT |
618 | */ |
619 | long keyctl_keyring_search(key_serial_t ringid, | |
620 | const char __user *_type, | |
621 | const char __user *_description, | |
622 | key_serial_t destringid) | |
623 | { | |
624 | struct key_type *ktype; | |
664cceb0 | 625 | key_ref_t keyring_ref, key_ref, dest_ref; |
1da177e4 | 626 | char type[32], *description; |
0cb409d9 | 627 | long ret; |
1da177e4 LT |
628 | |
629 | /* pull the type and description into kernel space */ | |
0cb409d9 | 630 | ret = key_get_type_from_user(type, _type, sizeof(type)); |
1da177e4 LT |
631 | if (ret < 0) |
632 | goto error; | |
1da177e4 | 633 | |
0cb409d9 DA |
634 | description = strndup_user(_description, PAGE_SIZE); |
635 | if (IS_ERR(description)) { | |
636 | ret = PTR_ERR(description); | |
1da177e4 | 637 | goto error; |
0cb409d9 | 638 | } |
1da177e4 LT |
639 | |
640 | /* get the keyring at which to begin the search */ | |
5593122e | 641 | keyring_ref = lookup_user_key(ringid, 0, KEY_SEARCH); |
664cceb0 DH |
642 | if (IS_ERR(keyring_ref)) { |
643 | ret = PTR_ERR(keyring_ref); | |
1da177e4 LT |
644 | goto error2; |
645 | } | |
646 | ||
647 | /* get the destination keyring if specified */ | |
664cceb0 | 648 | dest_ref = NULL; |
1da177e4 | 649 | if (destringid) { |
5593122e DH |
650 | dest_ref = lookup_user_key(destringid, KEY_LOOKUP_CREATE, |
651 | KEY_WRITE); | |
664cceb0 DH |
652 | if (IS_ERR(dest_ref)) { |
653 | ret = PTR_ERR(dest_ref); | |
1da177e4 LT |
654 | goto error3; |
655 | } | |
656 | } | |
657 | ||
658 | /* find the key type */ | |
659 | ktype = key_type_lookup(type); | |
660 | if (IS_ERR(ktype)) { | |
661 | ret = PTR_ERR(ktype); | |
662 | goto error4; | |
663 | } | |
664 | ||
665 | /* do the search */ | |
664cceb0 DH |
666 | key_ref = keyring_search(keyring_ref, ktype, description); |
667 | if (IS_ERR(key_ref)) { | |
668 | ret = PTR_ERR(key_ref); | |
1da177e4 LT |
669 | |
670 | /* treat lack or presence of a negative key the same */ | |
671 | if (ret == -EAGAIN) | |
672 | ret = -ENOKEY; | |
673 | goto error5; | |
674 | } | |
675 | ||
676 | /* link the resulting key to the destination keyring if we can */ | |
664cceb0 | 677 | if (dest_ref) { |
29db9190 DH |
678 | ret = key_permission(key_ref, KEY_LINK); |
679 | if (ret < 0) | |
1da177e4 LT |
680 | goto error6; |
681 | ||
664cceb0 | 682 | ret = key_link(key_ref_to_ptr(dest_ref), key_ref_to_ptr(key_ref)); |
1da177e4 LT |
683 | if (ret < 0) |
684 | goto error6; | |
685 | } | |
686 | ||
664cceb0 | 687 | ret = key_ref_to_ptr(key_ref)->serial; |
1da177e4 | 688 | |
c5b60b5e | 689 | error6: |
664cceb0 | 690 | key_ref_put(key_ref); |
c5b60b5e | 691 | error5: |
1da177e4 | 692 | key_type_put(ktype); |
c5b60b5e | 693 | error4: |
664cceb0 | 694 | key_ref_put(dest_ref); |
c5b60b5e | 695 | error3: |
664cceb0 | 696 | key_ref_put(keyring_ref); |
c5b60b5e | 697 | error2: |
1da177e4 | 698 | kfree(description); |
c5b60b5e | 699 | error: |
1da177e4 | 700 | return ret; |
a8b17ed0 | 701 | } |
1da177e4 | 702 | |
1da177e4 | 703 | /* |
973c9f4f DH |
704 | * Read a key's payload. |
705 | * | |
706 | * The key must either grant the caller Read permission, or it must grant the | |
707 | * caller Search permission when searched for from the process keyrings. | |
708 | * | |
709 | * If successful, we place up to buflen bytes of data into the buffer, if one | |
710 | * is provided, and return the amount of data that is available in the key, | |
711 | * irrespective of how much we copied into the buffer. | |
1da177e4 LT |
712 | */ |
713 | long keyctl_read_key(key_serial_t keyid, char __user *buffer, size_t buflen) | |
714 | { | |
664cceb0 DH |
715 | struct key *key; |
716 | key_ref_t key_ref; | |
1da177e4 LT |
717 | long ret; |
718 | ||
719 | /* find the key first */ | |
5593122e | 720 | key_ref = lookup_user_key(keyid, 0, 0); |
664cceb0 DH |
721 | if (IS_ERR(key_ref)) { |
722 | ret = -ENOKEY; | |
723 | goto error; | |
1da177e4 LT |
724 | } |
725 | ||
664cceb0 DH |
726 | key = key_ref_to_ptr(key_ref); |
727 | ||
728 | /* see if we can read it directly */ | |
29db9190 DH |
729 | ret = key_permission(key_ref, KEY_READ); |
730 | if (ret == 0) | |
664cceb0 | 731 | goto can_read_key; |
29db9190 DH |
732 | if (ret != -EACCES) |
733 | goto error; | |
664cceb0 DH |
734 | |
735 | /* we can't; see if it's searchable from this process's keyrings | |
736 | * - we automatically take account of the fact that it may be | |
737 | * dangling off an instantiation key | |
738 | */ | |
739 | if (!is_key_possessed(key_ref)) { | |
740 | ret = -EACCES; | |
741 | goto error2; | |
742 | } | |
1da177e4 LT |
743 | |
744 | /* the key is probably readable - now try to read it */ | |
c5b60b5e | 745 | can_read_key: |
1da177e4 LT |
746 | ret = key_validate(key); |
747 | if (ret == 0) { | |
748 | ret = -EOPNOTSUPP; | |
749 | if (key->type->read) { | |
750 | /* read the data with the semaphore held (since we | |
751 | * might sleep) */ | |
752 | down_read(&key->sem); | |
753 | ret = key->type->read(key, buffer, buflen); | |
754 | up_read(&key->sem); | |
755 | } | |
756 | } | |
757 | ||
c5b60b5e | 758 | error2: |
1da177e4 | 759 | key_put(key); |
c5b60b5e | 760 | error: |
1da177e4 | 761 | return ret; |
a8b17ed0 | 762 | } |
1da177e4 | 763 | |
1da177e4 | 764 | /* |
973c9f4f DH |
765 | * Change the ownership of a key |
766 | * | |
767 | * The key must grant the caller Setattr permission for this to work, though | |
768 | * the key need not be fully instantiated yet. For the UID to be changed, or | |
769 | * for the GID to be changed to a group the caller is not a member of, the | |
770 | * caller must have sysadmin capability. If either uid or gid is -1 then that | |
771 | * attribute is not changed. | |
772 | * | |
773 | * If the UID is to be changed, the new user must have sufficient quota to | |
774 | * accept the key. The quota deduction will be removed from the old user to | |
775 | * the new user should the attribute be changed. | |
776 | * | |
777 | * If successful, 0 will be returned. | |
1da177e4 | 778 | */ |
9a56c2db | 779 | long keyctl_chown_key(key_serial_t id, uid_t user, gid_t group) |
1da177e4 | 780 | { |
5801649d | 781 | struct key_user *newowner, *zapowner = NULL; |
1da177e4 | 782 | struct key *key; |
664cceb0 | 783 | key_ref_t key_ref; |
1da177e4 | 784 | long ret; |
9a56c2db EB |
785 | kuid_t uid; |
786 | kgid_t gid; | |
787 | ||
788 | uid = make_kuid(current_user_ns(), user); | |
789 | gid = make_kgid(current_user_ns(), group); | |
790 | ret = -EINVAL; | |
791 | if ((user != (uid_t) -1) && !uid_valid(uid)) | |
792 | goto error; | |
793 | if ((group != (gid_t) -1) && !gid_valid(gid)) | |
794 | goto error; | |
1da177e4 LT |
795 | |
796 | ret = 0; | |
9a56c2db | 797 | if (user == (uid_t) -1 && group == (gid_t) -1) |
1da177e4 LT |
798 | goto error; |
799 | ||
5593122e DH |
800 | key_ref = lookup_user_key(id, KEY_LOOKUP_CREATE | KEY_LOOKUP_PARTIAL, |
801 | KEY_SETATTR); | |
664cceb0 DH |
802 | if (IS_ERR(key_ref)) { |
803 | ret = PTR_ERR(key_ref); | |
1da177e4 LT |
804 | goto error; |
805 | } | |
806 | ||
664cceb0 DH |
807 | key = key_ref_to_ptr(key_ref); |
808 | ||
1da177e4 LT |
809 | /* make the changes with the locks held to prevent chown/chown races */ |
810 | ret = -EACCES; | |
811 | down_write(&key->sem); | |
1da177e4 LT |
812 | |
813 | if (!capable(CAP_SYS_ADMIN)) { | |
814 | /* only the sysadmin can chown a key to some other UID */ | |
9a56c2db | 815 | if (user != (uid_t) -1 && !uid_eq(key->uid, uid)) |
5801649d | 816 | goto error_put; |
1da177e4 LT |
817 | |
818 | /* only the sysadmin can set the key's GID to a group other | |
819 | * than one of those that the current process subscribes to */ | |
9a56c2db | 820 | if (group != (gid_t) -1 && !gid_eq(gid, key->gid) && !in_group_p(gid)) |
5801649d | 821 | goto error_put; |
1da177e4 LT |
822 | } |
823 | ||
5801649d | 824 | /* change the UID */ |
9a56c2db | 825 | if (user != (uid_t) -1 && !uid_eq(uid, key->uid)) { |
5801649d | 826 | ret = -ENOMEM; |
9a56c2db | 827 | newowner = key_user_lookup(uid); |
5801649d FT |
828 | if (!newowner) |
829 | goto error_put; | |
830 | ||
831 | /* transfer the quota burden to the new user */ | |
832 | if (test_bit(KEY_FLAG_IN_QUOTA, &key->flags)) { | |
9a56c2db | 833 | unsigned maxkeys = uid_eq(uid, GLOBAL_ROOT_UID) ? |
0b77f5bf | 834 | key_quota_root_maxkeys : key_quota_maxkeys; |
9a56c2db | 835 | unsigned maxbytes = uid_eq(uid, GLOBAL_ROOT_UID) ? |
0b77f5bf DH |
836 | key_quota_root_maxbytes : key_quota_maxbytes; |
837 | ||
5801649d | 838 | spin_lock(&newowner->lock); |
0b77f5bf DH |
839 | if (newowner->qnkeys + 1 >= maxkeys || |
840 | newowner->qnbytes + key->quotalen >= maxbytes || | |
841 | newowner->qnbytes + key->quotalen < | |
842 | newowner->qnbytes) | |
5801649d FT |
843 | goto quota_overrun; |
844 | ||
845 | newowner->qnkeys++; | |
846 | newowner->qnbytes += key->quotalen; | |
847 | spin_unlock(&newowner->lock); | |
848 | ||
849 | spin_lock(&key->user->lock); | |
850 | key->user->qnkeys--; | |
851 | key->user->qnbytes -= key->quotalen; | |
852 | spin_unlock(&key->user->lock); | |
853 | } | |
854 | ||
855 | atomic_dec(&key->user->nkeys); | |
856 | atomic_inc(&newowner->nkeys); | |
857 | ||
858 | if (test_bit(KEY_FLAG_INSTANTIATED, &key->flags)) { | |
859 | atomic_dec(&key->user->nikeys); | |
860 | atomic_inc(&newowner->nikeys); | |
861 | } | |
862 | ||
863 | zapowner = key->user; | |
864 | key->user = newowner; | |
865 | key->uid = uid; | |
1da177e4 LT |
866 | } |
867 | ||
868 | /* change the GID */ | |
9a56c2db | 869 | if (group != (gid_t) -1) |
1da177e4 LT |
870 | key->gid = gid; |
871 | ||
872 | ret = 0; | |
873 | ||
5801649d | 874 | error_put: |
1da177e4 LT |
875 | up_write(&key->sem); |
876 | key_put(key); | |
5801649d FT |
877 | if (zapowner) |
878 | key_user_put(zapowner); | |
879 | error: | |
1da177e4 LT |
880 | return ret; |
881 | ||
5801649d FT |
882 | quota_overrun: |
883 | spin_unlock(&newowner->lock); | |
884 | zapowner = newowner; | |
885 | ret = -EDQUOT; | |
886 | goto error_put; | |
a8b17ed0 | 887 | } |
5801649d | 888 | |
1da177e4 | 889 | /* |
973c9f4f DH |
890 | * Change the permission mask on a key. |
891 | * | |
892 | * The key must grant the caller Setattr permission for this to work, though | |
893 | * the key need not be fully instantiated yet. If the caller does not have | |
894 | * sysadmin capability, it may only change the permission on keys that it owns. | |
1da177e4 LT |
895 | */ |
896 | long keyctl_setperm_key(key_serial_t id, key_perm_t perm) | |
897 | { | |
898 | struct key *key; | |
664cceb0 | 899 | key_ref_t key_ref; |
1da177e4 LT |
900 | long ret; |
901 | ||
902 | ret = -EINVAL; | |
664cceb0 | 903 | if (perm & ~(KEY_POS_ALL | KEY_USR_ALL | KEY_GRP_ALL | KEY_OTH_ALL)) |
1da177e4 LT |
904 | goto error; |
905 | ||
5593122e DH |
906 | key_ref = lookup_user_key(id, KEY_LOOKUP_CREATE | KEY_LOOKUP_PARTIAL, |
907 | KEY_SETATTR); | |
664cceb0 DH |
908 | if (IS_ERR(key_ref)) { |
909 | ret = PTR_ERR(key_ref); | |
1da177e4 LT |
910 | goto error; |
911 | } | |
912 | ||
664cceb0 DH |
913 | key = key_ref_to_ptr(key_ref); |
914 | ||
76d8aeab | 915 | /* make the changes with the locks held to prevent chown/chmod races */ |
1da177e4 LT |
916 | ret = -EACCES; |
917 | down_write(&key->sem); | |
1da177e4 | 918 | |
76d8aeab | 919 | /* if we're not the sysadmin, we can only change a key that we own */ |
9a56c2db | 920 | if (capable(CAP_SYS_ADMIN) || uid_eq(key->uid, current_fsuid())) { |
76d8aeab DH |
921 | key->perm = perm; |
922 | ret = 0; | |
923 | } | |
1da177e4 | 924 | |
1da177e4 LT |
925 | up_write(&key->sem); |
926 | key_put(key); | |
76d8aeab | 927 | error: |
1da177e4 | 928 | return ret; |
a8b17ed0 | 929 | } |
1da177e4 | 930 | |
8bbf4976 | 931 | /* |
973c9f4f DH |
932 | * Get the destination keyring for instantiation and check that the caller has |
933 | * Write permission on it. | |
8bbf4976 DH |
934 | */ |
935 | static long get_instantiation_keyring(key_serial_t ringid, | |
936 | struct request_key_auth *rka, | |
937 | struct key **_dest_keyring) | |
938 | { | |
939 | key_ref_t dkref; | |
940 | ||
eca1bf5b DH |
941 | *_dest_keyring = NULL; |
942 | ||
8bbf4976 | 943 | /* just return a NULL pointer if we weren't asked to make a link */ |
eca1bf5b | 944 | if (ringid == 0) |
8bbf4976 | 945 | return 0; |
8bbf4976 DH |
946 | |
947 | /* if a specific keyring is nominated by ID, then use that */ | |
948 | if (ringid > 0) { | |
5593122e | 949 | dkref = lookup_user_key(ringid, KEY_LOOKUP_CREATE, KEY_WRITE); |
8bbf4976 DH |
950 | if (IS_ERR(dkref)) |
951 | return PTR_ERR(dkref); | |
952 | *_dest_keyring = key_ref_to_ptr(dkref); | |
953 | return 0; | |
954 | } | |
955 | ||
956 | if (ringid == KEY_SPEC_REQKEY_AUTH_KEY) | |
957 | return -EINVAL; | |
958 | ||
959 | /* otherwise specify the destination keyring recorded in the | |
960 | * authorisation key (any KEY_SPEC_*_KEYRING) */ | |
961 | if (ringid >= KEY_SPEC_REQUESTOR_KEYRING) { | |
21279cfa | 962 | *_dest_keyring = key_get(rka->dest_keyring); |
8bbf4976 DH |
963 | return 0; |
964 | } | |
965 | ||
966 | return -ENOKEY; | |
967 | } | |
968 | ||
d84f4f99 | 969 | /* |
973c9f4f | 970 | * Change the request_key authorisation key on the current process. |
d84f4f99 DH |
971 | */ |
972 | static int keyctl_change_reqkey_auth(struct key *key) | |
973 | { | |
974 | struct cred *new; | |
975 | ||
976 | new = prepare_creds(); | |
977 | if (!new) | |
978 | return -ENOMEM; | |
979 | ||
980 | key_put(new->request_key_auth); | |
981 | new->request_key_auth = key_get(key); | |
982 | ||
983 | return commit_creds(new); | |
984 | } | |
985 | ||
ee009e4a DH |
986 | /* |
987 | * Copy the iovec data from userspace | |
988 | */ | |
989 | static long copy_from_user_iovec(void *buffer, const struct iovec *iov, | |
990 | unsigned ioc) | |
991 | { | |
992 | for (; ioc > 0; ioc--) { | |
993 | if (copy_from_user(buffer, iov->iov_base, iov->iov_len) != 0) | |
994 | return -EFAULT; | |
995 | buffer += iov->iov_len; | |
996 | iov++; | |
997 | } | |
998 | return 0; | |
999 | } | |
1000 | ||
1da177e4 | 1001 | /* |
973c9f4f DH |
1002 | * Instantiate a key with the specified payload and link the key into the |
1003 | * destination keyring if one is given. | |
1004 | * | |
1005 | * The caller must have the appropriate instantiation permit set for this to | |
1006 | * work (see keyctl_assume_authority). No other permissions are required. | |
1007 | * | |
1008 | * If successful, 0 will be returned. | |
1da177e4 | 1009 | */ |
ee009e4a DH |
1010 | long keyctl_instantiate_key_common(key_serial_t id, |
1011 | const struct iovec *payload_iov, | |
1012 | unsigned ioc, | |
1013 | size_t plen, | |
1014 | key_serial_t ringid) | |
1da177e4 | 1015 | { |
d84f4f99 | 1016 | const struct cred *cred = current_cred(); |
3e30148c | 1017 | struct request_key_auth *rka; |
8bbf4976 | 1018 | struct key *instkey, *dest_keyring; |
1da177e4 LT |
1019 | void *payload; |
1020 | long ret; | |
38bbca6b | 1021 | bool vm = false; |
1da177e4 | 1022 | |
d84f4f99 DH |
1023 | kenter("%d,,%zu,%d", id, plen, ringid); |
1024 | ||
1da177e4 | 1025 | ret = -EINVAL; |
38bbca6b | 1026 | if (plen > 1024 * 1024 - 1) |
1da177e4 LT |
1027 | goto error; |
1028 | ||
b5f545c8 DH |
1029 | /* the appropriate instantiation authorisation key must have been |
1030 | * assumed before calling this */ | |
1031 | ret = -EPERM; | |
d84f4f99 | 1032 | instkey = cred->request_key_auth; |
b5f545c8 DH |
1033 | if (!instkey) |
1034 | goto error; | |
1035 | ||
1036 | rka = instkey->payload.data; | |
1037 | if (rka->target_key->serial != id) | |
1038 | goto error; | |
1039 | ||
1da177e4 LT |
1040 | /* pull the payload in if one was supplied */ |
1041 | payload = NULL; | |
1042 | ||
ee009e4a | 1043 | if (payload_iov) { |
1da177e4 LT |
1044 | ret = -ENOMEM; |
1045 | payload = kmalloc(plen, GFP_KERNEL); | |
38bbca6b DH |
1046 | if (!payload) { |
1047 | if (plen <= PAGE_SIZE) | |
1048 | goto error; | |
1049 | vm = true; | |
1050 | payload = vmalloc(plen); | |
1051 | if (!payload) | |
1052 | goto error; | |
1053 | } | |
1da177e4 | 1054 | |
ee009e4a DH |
1055 | ret = copy_from_user_iovec(payload, payload_iov, ioc); |
1056 | if (ret < 0) | |
1da177e4 LT |
1057 | goto error2; |
1058 | } | |
1059 | ||
3e30148c DH |
1060 | /* find the destination keyring amongst those belonging to the |
1061 | * requesting task */ | |
8bbf4976 DH |
1062 | ret = get_instantiation_keyring(ringid, rka, &dest_keyring); |
1063 | if (ret < 0) | |
1064 | goto error2; | |
1da177e4 LT |
1065 | |
1066 | /* instantiate the key and link it into a keyring */ | |
3e30148c | 1067 | ret = key_instantiate_and_link(rka->target_key, payload, plen, |
8bbf4976 | 1068 | dest_keyring, instkey); |
1da177e4 | 1069 | |
8bbf4976 | 1070 | key_put(dest_keyring); |
b5f545c8 DH |
1071 | |
1072 | /* discard the assumed authority if it's just been disabled by | |
1073 | * instantiation of the key */ | |
d84f4f99 DH |
1074 | if (ret == 0) |
1075 | keyctl_change_reqkey_auth(NULL); | |
b5f545c8 DH |
1076 | |
1077 | error2: | |
38bbca6b DH |
1078 | if (!vm) |
1079 | kfree(payload); | |
1080 | else | |
1081 | vfree(payload); | |
b5f545c8 | 1082 | error: |
1da177e4 | 1083 | return ret; |
a8b17ed0 | 1084 | } |
1da177e4 | 1085 | |
ee009e4a DH |
1086 | /* |
1087 | * Instantiate a key with the specified payload and link the key into the | |
1088 | * destination keyring if one is given. | |
1089 | * | |
1090 | * The caller must have the appropriate instantiation permit set for this to | |
1091 | * work (see keyctl_assume_authority). No other permissions are required. | |
1092 | * | |
1093 | * If successful, 0 will be returned. | |
1094 | */ | |
1095 | long keyctl_instantiate_key(key_serial_t id, | |
1096 | const void __user *_payload, | |
1097 | size_t plen, | |
1098 | key_serial_t ringid) | |
1099 | { | |
1100 | if (_payload && plen) { | |
1101 | struct iovec iov[1] = { | |
1102 | [0].iov_base = (void __user *)_payload, | |
1103 | [0].iov_len = plen | |
1104 | }; | |
1105 | ||
1106 | return keyctl_instantiate_key_common(id, iov, 1, plen, ringid); | |
1107 | } | |
1108 | ||
1109 | return keyctl_instantiate_key_common(id, NULL, 0, 0, ringid); | |
1110 | } | |
1111 | ||
1112 | /* | |
1113 | * Instantiate a key with the specified multipart payload and link the key into | |
1114 | * the destination keyring if one is given. | |
1115 | * | |
1116 | * The caller must have the appropriate instantiation permit set for this to | |
1117 | * work (see keyctl_assume_authority). No other permissions are required. | |
1118 | * | |
1119 | * If successful, 0 will be returned. | |
1120 | */ | |
1121 | long keyctl_instantiate_key_iov(key_serial_t id, | |
1122 | const struct iovec __user *_payload_iov, | |
1123 | unsigned ioc, | |
1124 | key_serial_t ringid) | |
1125 | { | |
1126 | struct iovec iovstack[UIO_FASTIOV], *iov = iovstack; | |
1127 | long ret; | |
1128 | ||
423b9788 | 1129 | if (!_payload_iov || !ioc) |
ee009e4a DH |
1130 | goto no_payload; |
1131 | ||
1132 | ret = rw_copy_check_uvector(WRITE, _payload_iov, ioc, | |
ac34ebb3 | 1133 | ARRAY_SIZE(iovstack), iovstack, &iov); |
ee009e4a | 1134 | if (ret < 0) |
a84a9219 | 1135 | goto err; |
ee009e4a DH |
1136 | if (ret == 0) |
1137 | goto no_payload_free; | |
1138 | ||
1139 | ret = keyctl_instantiate_key_common(id, iov, ioc, ret, ringid); | |
a84a9219 | 1140 | err: |
ee009e4a DH |
1141 | if (iov != iovstack) |
1142 | kfree(iov); | |
1143 | return ret; | |
1144 | ||
1145 | no_payload_free: | |
1146 | if (iov != iovstack) | |
1147 | kfree(iov); | |
1148 | no_payload: | |
1149 | return keyctl_instantiate_key_common(id, NULL, 0, 0, ringid); | |
1150 | } | |
1151 | ||
1da177e4 | 1152 | /* |
973c9f4f DH |
1153 | * Negatively instantiate the key with the given timeout (in seconds) and link |
1154 | * 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 -ENOKEY until the negative key expires. | |
1164 | * | |
1165 | * If successful, 0 will be returned. | |
1da177e4 LT |
1166 | */ |
1167 | long keyctl_negate_key(key_serial_t id, unsigned timeout, key_serial_t ringid) | |
fdd1b945 DH |
1168 | { |
1169 | return keyctl_reject_key(id, timeout, ENOKEY, ringid); | |
1170 | } | |
1171 | ||
1172 | /* | |
1173 | * Negatively instantiate the key with the given timeout (in seconds) and error | |
1174 | * code and link the key into the destination keyring if one is given. | |
1175 | * | |
1176 | * The caller must have the appropriate instantiation permit set for this to | |
1177 | * work (see keyctl_assume_authority). No other permissions are required. | |
1178 | * | |
1179 | * The key and any links to the key will be automatically garbage collected | |
1180 | * after the timeout expires. | |
1181 | * | |
1182 | * Negative keys are used to rate limit repeated request_key() calls by causing | |
1183 | * them to return the specified error code until the negative key expires. | |
1184 | * | |
1185 | * If successful, 0 will be returned. | |
1186 | */ | |
1187 | long keyctl_reject_key(key_serial_t id, unsigned timeout, unsigned error, | |
1188 | key_serial_t ringid) | |
1da177e4 | 1189 | { |
d84f4f99 | 1190 | const struct cred *cred = current_cred(); |
3e30148c | 1191 | struct request_key_auth *rka; |
8bbf4976 | 1192 | struct key *instkey, *dest_keyring; |
1da177e4 LT |
1193 | long ret; |
1194 | ||
fdd1b945 DH |
1195 | kenter("%d,%u,%u,%d", id, timeout, error, ringid); |
1196 | ||
1197 | /* must be a valid error code and mustn't be a kernel special */ | |
1198 | if (error <= 0 || | |
1199 | error >= MAX_ERRNO || | |
1200 | error == ERESTARTSYS || | |
1201 | error == ERESTARTNOINTR || | |
1202 | error == ERESTARTNOHAND || | |
1203 | error == ERESTART_RESTARTBLOCK) | |
1204 | return -EINVAL; | |
d84f4f99 | 1205 | |
b5f545c8 DH |
1206 | /* the appropriate instantiation authorisation key must have been |
1207 | * assumed before calling this */ | |
1208 | ret = -EPERM; | |
d84f4f99 | 1209 | instkey = cred->request_key_auth; |
b5f545c8 | 1210 | if (!instkey) |
1da177e4 | 1211 | goto error; |
1da177e4 | 1212 | |
3e30148c | 1213 | rka = instkey->payload.data; |
b5f545c8 DH |
1214 | if (rka->target_key->serial != id) |
1215 | goto error; | |
3e30148c | 1216 | |
1da177e4 LT |
1217 | /* find the destination keyring if present (which must also be |
1218 | * writable) */ | |
8bbf4976 DH |
1219 | ret = get_instantiation_keyring(ringid, rka, &dest_keyring); |
1220 | if (ret < 0) | |
1221 | goto error; | |
1da177e4 LT |
1222 | |
1223 | /* instantiate the key and link it into a keyring */ | |
fdd1b945 | 1224 | ret = key_reject_and_link(rka->target_key, timeout, error, |
8bbf4976 | 1225 | dest_keyring, instkey); |
1da177e4 | 1226 | |
8bbf4976 | 1227 | key_put(dest_keyring); |
b5f545c8 DH |
1228 | |
1229 | /* discard the assumed authority if it's just been disabled by | |
1230 | * instantiation of the key */ | |
d84f4f99 DH |
1231 | if (ret == 0) |
1232 | keyctl_change_reqkey_auth(NULL); | |
b5f545c8 DH |
1233 | |
1234 | error: | |
1da177e4 | 1235 | return ret; |
a8b17ed0 | 1236 | } |
1da177e4 | 1237 | |
3e30148c | 1238 | /* |
973c9f4f DH |
1239 | * Read or set the default keyring in which request_key() will cache keys and |
1240 | * return the old setting. | |
1241 | * | |
1242 | * If a process keyring is specified then this will be created if it doesn't | |
1243 | * yet exist. The old setting will be returned if successful. | |
3e30148c DH |
1244 | */ |
1245 | long keyctl_set_reqkey_keyring(int reqkey_defl) | |
1246 | { | |
d84f4f99 DH |
1247 | struct cred *new; |
1248 | int ret, old_setting; | |
1249 | ||
1250 | old_setting = current_cred_xxx(jit_keyring); | |
1251 | ||
1252 | if (reqkey_defl == KEY_REQKEY_DEFL_NO_CHANGE) | |
1253 | return old_setting; | |
1254 | ||
1255 | new = prepare_creds(); | |
1256 | if (!new) | |
1257 | return -ENOMEM; | |
3e30148c DH |
1258 | |
1259 | switch (reqkey_defl) { | |
1260 | case KEY_REQKEY_DEFL_THREAD_KEYRING: | |
d84f4f99 | 1261 | ret = install_thread_keyring_to_cred(new); |
3e30148c | 1262 | if (ret < 0) |
d84f4f99 | 1263 | goto error; |
3e30148c DH |
1264 | goto set; |
1265 | ||
1266 | case KEY_REQKEY_DEFL_PROCESS_KEYRING: | |
d84f4f99 DH |
1267 | ret = install_process_keyring_to_cred(new); |
1268 | if (ret < 0) { | |
1269 | if (ret != -EEXIST) | |
1270 | goto error; | |
1271 | ret = 0; | |
1272 | } | |
1273 | goto set; | |
3e30148c DH |
1274 | |
1275 | case KEY_REQKEY_DEFL_DEFAULT: | |
1276 | case KEY_REQKEY_DEFL_SESSION_KEYRING: | |
1277 | case KEY_REQKEY_DEFL_USER_KEYRING: | |
1278 | case KEY_REQKEY_DEFL_USER_SESSION_KEYRING: | |
d84f4f99 DH |
1279 | case KEY_REQKEY_DEFL_REQUESTOR_KEYRING: |
1280 | goto set; | |
3e30148c DH |
1281 | |
1282 | case KEY_REQKEY_DEFL_NO_CHANGE: | |
3e30148c DH |
1283 | case KEY_REQKEY_DEFL_GROUP_KEYRING: |
1284 | default: | |
d84f4f99 DH |
1285 | ret = -EINVAL; |
1286 | goto error; | |
3e30148c DH |
1287 | } |
1288 | ||
d84f4f99 DH |
1289 | set: |
1290 | new->jit_keyring = reqkey_defl; | |
1291 | commit_creds(new); | |
1292 | return old_setting; | |
1293 | error: | |
1294 | abort_creds(new); | |
4303ef19 | 1295 | return ret; |
a8b17ed0 | 1296 | } |
d84f4f99 | 1297 | |
017679c4 | 1298 | /* |
973c9f4f DH |
1299 | * Set or clear the timeout on a key. |
1300 | * | |
1301 | * Either the key must grant the caller Setattr permission or else the caller | |
1302 | * must hold an instantiation authorisation token for the key. | |
1303 | * | |
1304 | * The timeout is either 0 to clear the timeout, or a number of seconds from | |
1305 | * the current time. The key and any links to the key will be automatically | |
1306 | * garbage collected after the timeout expires. | |
1307 | * | |
1308 | * If successful, 0 is returned. | |
017679c4 DH |
1309 | */ |
1310 | long keyctl_set_timeout(key_serial_t id, unsigned timeout) | |
1311 | { | |
9156235b | 1312 | struct key *key, *instkey; |
017679c4 | 1313 | key_ref_t key_ref; |
017679c4 DH |
1314 | long ret; |
1315 | ||
5593122e DH |
1316 | key_ref = lookup_user_key(id, KEY_LOOKUP_CREATE | KEY_LOOKUP_PARTIAL, |
1317 | KEY_SETATTR); | |
017679c4 | 1318 | if (IS_ERR(key_ref)) { |
9156235b DH |
1319 | /* setting the timeout on a key under construction is permitted |
1320 | * if we have the authorisation token handy */ | |
1321 | if (PTR_ERR(key_ref) == -EACCES) { | |
1322 | instkey = key_get_instantiation_authkey(id); | |
1323 | if (!IS_ERR(instkey)) { | |
1324 | key_put(instkey); | |
1325 | key_ref = lookup_user_key(id, | |
1326 | KEY_LOOKUP_PARTIAL, | |
1327 | 0); | |
1328 | if (!IS_ERR(key_ref)) | |
1329 | goto okay; | |
1330 | } | |
1331 | } | |
1332 | ||
017679c4 DH |
1333 | ret = PTR_ERR(key_ref); |
1334 | goto error; | |
1335 | } | |
1336 | ||
9156235b | 1337 | okay: |
017679c4 | 1338 | key = key_ref_to_ptr(key_ref); |
59e6b9c1 | 1339 | key_set_timeout(key, timeout); |
017679c4 DH |
1340 | key_put(key); |
1341 | ||
1342 | ret = 0; | |
1343 | error: | |
1344 | return ret; | |
a8b17ed0 | 1345 | } |
017679c4 | 1346 | |
b5f545c8 | 1347 | /* |
973c9f4f DH |
1348 | * Assume (or clear) the authority to instantiate the specified key. |
1349 | * | |
1350 | * This sets the authoritative token currently in force for key instantiation. | |
1351 | * This must be done for a key to be instantiated. It has the effect of making | |
1352 | * available all the keys from the caller of the request_key() that created a | |
1353 | * key to request_key() calls made by the caller of this function. | |
1354 | * | |
1355 | * The caller must have the instantiation key in their process keyrings with a | |
1356 | * Search permission grant available to the caller. | |
1357 | * | |
1358 | * If the ID given is 0, then the setting will be cleared and 0 returned. | |
1359 | * | |
1360 | * If the ID given has a matching an authorisation key, then that key will be | |
1361 | * set and its ID will be returned. The authorisation key can be read to get | |
1362 | * the callout information passed to request_key(). | |
b5f545c8 DH |
1363 | */ |
1364 | long keyctl_assume_authority(key_serial_t id) | |
1365 | { | |
1366 | struct key *authkey; | |
1367 | long ret; | |
1368 | ||
1369 | /* special key IDs aren't permitted */ | |
1370 | ret = -EINVAL; | |
1371 | if (id < 0) | |
1372 | goto error; | |
1373 | ||
1374 | /* we divest ourselves of authority if given an ID of 0 */ | |
1375 | if (id == 0) { | |
d84f4f99 | 1376 | ret = keyctl_change_reqkey_auth(NULL); |
b5f545c8 DH |
1377 | goto error; |
1378 | } | |
1379 | ||
1380 | /* attempt to assume the authority temporarily granted to us whilst we | |
1381 | * instantiate the specified key | |
1382 | * - the authorisation key must be in the current task's keyrings | |
1383 | * somewhere | |
1384 | */ | |
1385 | authkey = key_get_instantiation_authkey(id); | |
1386 | if (IS_ERR(authkey)) { | |
1387 | ret = PTR_ERR(authkey); | |
1388 | goto error; | |
1389 | } | |
1390 | ||
d84f4f99 DH |
1391 | ret = keyctl_change_reqkey_auth(authkey); |
1392 | if (ret < 0) | |
1393 | goto error; | |
1394 | key_put(authkey); | |
b5f545c8 | 1395 | |
d84f4f99 | 1396 | ret = authkey->serial; |
b5f545c8 DH |
1397 | error: |
1398 | return ret; | |
a8b17ed0 | 1399 | } |
b5f545c8 | 1400 | |
70a5bb72 | 1401 | /* |
973c9f4f DH |
1402 | * Get a key's the LSM security label. |
1403 | * | |
1404 | * The key must grant the caller View permission for this to work. | |
1405 | * | |
1406 | * If there's a buffer, then up to buflen bytes of data will be placed into it. | |
1407 | * | |
1408 | * If successful, the amount of information available will be returned, | |
1409 | * irrespective of how much was copied (including the terminal NUL). | |
70a5bb72 DH |
1410 | */ |
1411 | long keyctl_get_security(key_serial_t keyid, | |
1412 | char __user *buffer, | |
1413 | size_t buflen) | |
1414 | { | |
1415 | struct key *key, *instkey; | |
1416 | key_ref_t key_ref; | |
1417 | char *context; | |
1418 | long ret; | |
1419 | ||
5593122e | 1420 | key_ref = lookup_user_key(keyid, KEY_LOOKUP_PARTIAL, KEY_VIEW); |
70a5bb72 DH |
1421 | if (IS_ERR(key_ref)) { |
1422 | if (PTR_ERR(key_ref) != -EACCES) | |
1423 | return PTR_ERR(key_ref); | |
1424 | ||
1425 | /* viewing a key under construction is also permitted if we | |
1426 | * have the authorisation token handy */ | |
1427 | instkey = key_get_instantiation_authkey(keyid); | |
1428 | if (IS_ERR(instkey)) | |
fa1cc7b5 | 1429 | return PTR_ERR(instkey); |
70a5bb72 DH |
1430 | key_put(instkey); |
1431 | ||
5593122e | 1432 | key_ref = lookup_user_key(keyid, KEY_LOOKUP_PARTIAL, 0); |
70a5bb72 DH |
1433 | if (IS_ERR(key_ref)) |
1434 | return PTR_ERR(key_ref); | |
1435 | } | |
1436 | ||
1437 | key = key_ref_to_ptr(key_ref); | |
1438 | ret = security_key_getsecurity(key, &context); | |
1439 | if (ret == 0) { | |
1440 | /* if no information was returned, give userspace an empty | |
1441 | * string */ | |
1442 | ret = 1; | |
1443 | if (buffer && buflen > 0 && | |
1444 | copy_to_user(buffer, "", 1) != 0) | |
1445 | ret = -EFAULT; | |
1446 | } else if (ret > 0) { | |
1447 | /* return as much data as there's room for */ | |
1448 | if (buffer && buflen > 0) { | |
1449 | if (buflen > ret) | |
1450 | buflen = ret; | |
1451 | ||
1452 | if (copy_to_user(buffer, context, buflen) != 0) | |
1453 | ret = -EFAULT; | |
1454 | } | |
1455 | ||
1456 | kfree(context); | |
1457 | } | |
1458 | ||
1459 | key_ref_put(key_ref); | |
1460 | return ret; | |
1461 | } | |
1462 | ||
ee18d64c | 1463 | /* |
973c9f4f DH |
1464 | * Attempt to install the calling process's session keyring on the process's |
1465 | * parent process. | |
1466 | * | |
1467 | * The keyring must exist and must grant the caller LINK permission, and the | |
1468 | * parent process must be single-threaded and must have the same effective | |
1469 | * ownership as this process and mustn't be SUID/SGID. | |
1470 | * | |
1471 | * The keyring will be emplaced on the parent when it next resumes userspace. | |
1472 | * | |
1473 | * If successful, 0 will be returned. | |
ee18d64c DH |
1474 | */ |
1475 | long keyctl_session_to_parent(void) | |
1476 | { | |
1477 | struct task_struct *me, *parent; | |
1478 | const struct cred *mycred, *pcred; | |
67d12145 | 1479 | struct callback_head *newwork, *oldwork; |
ee18d64c | 1480 | key_ref_t keyring_r; |
413cd3d9 | 1481 | struct cred *cred; |
ee18d64c DH |
1482 | int ret; |
1483 | ||
1484 | keyring_r = lookup_user_key(KEY_SPEC_SESSION_KEYRING, 0, KEY_LINK); | |
1485 | if (IS_ERR(keyring_r)) | |
1486 | return PTR_ERR(keyring_r); | |
1487 | ||
413cd3d9 | 1488 | ret = -ENOMEM; |
413cd3d9 | 1489 | |
ee18d64c DH |
1490 | /* our parent is going to need a new cred struct, a new tgcred struct |
1491 | * and new security data, so we allocate them here to prevent ENOMEM in | |
1492 | * our parent */ | |
ee18d64c DH |
1493 | cred = cred_alloc_blank(); |
1494 | if (!cred) | |
67d12145 AV |
1495 | goto error_keyring; |
1496 | newwork = &cred->rcu; | |
ee18d64c | 1497 | |
3a50597d DH |
1498 | cred->session_keyring = key_ref_to_ptr(keyring_r); |
1499 | keyring_r = NULL; | |
67d12145 | 1500 | init_task_work(newwork, key_change_session_keyring); |
ee18d64c DH |
1501 | |
1502 | me = current; | |
9d1ac65a | 1503 | rcu_read_lock(); |
ee18d64c DH |
1504 | write_lock_irq(&tasklist_lock); |
1505 | ||
ee18d64c | 1506 | ret = -EPERM; |
413cd3d9 ON |
1507 | oldwork = NULL; |
1508 | parent = me->real_parent; | |
ee18d64c DH |
1509 | |
1510 | /* the parent mustn't be init and mustn't be a kernel thread */ | |
1511 | if (parent->pid <= 1 || !parent->mm) | |
413cd3d9 | 1512 | goto unlock; |
ee18d64c DH |
1513 | |
1514 | /* the parent must be single threaded */ | |
dd98acf7 | 1515 | if (!thread_group_empty(parent)) |
413cd3d9 | 1516 | goto unlock; |
ee18d64c DH |
1517 | |
1518 | /* the parent and the child must have different session keyrings or | |
1519 | * there's no point */ | |
1520 | mycred = current_cred(); | |
1521 | pcred = __task_cred(parent); | |
1522 | if (mycred == pcred || | |
3a50597d | 1523 | mycred->session_keyring == pcred->session_keyring) { |
413cd3d9 ON |
1524 | ret = 0; |
1525 | goto unlock; | |
1526 | } | |
ee18d64c DH |
1527 | |
1528 | /* the parent must have the same effective ownership and mustn't be | |
1529 | * SUID/SGID */ | |
9a56c2db EB |
1530 | if (!uid_eq(pcred->uid, mycred->euid) || |
1531 | !uid_eq(pcred->euid, mycred->euid) || | |
1532 | !uid_eq(pcred->suid, mycred->euid) || | |
1533 | !gid_eq(pcred->gid, mycred->egid) || | |
1534 | !gid_eq(pcred->egid, mycred->egid) || | |
1535 | !gid_eq(pcred->sgid, mycred->egid)) | |
413cd3d9 | 1536 | goto unlock; |
ee18d64c DH |
1537 | |
1538 | /* the keyrings must have the same UID */ | |
3a50597d | 1539 | if ((pcred->session_keyring && |
2a74dbb9 LT |
1540 | !uid_eq(pcred->session_keyring->uid, mycred->euid)) || |
1541 | !uid_eq(mycred->session_keyring->uid, mycred->euid)) | |
413cd3d9 | 1542 | goto unlock; |
ee18d64c | 1543 | |
413cd3d9 ON |
1544 | /* cancel an already pending keyring replacement */ |
1545 | oldwork = task_work_cancel(parent, key_change_session_keyring); | |
ee18d64c DH |
1546 | |
1547 | /* the replacement session keyring is applied just prior to userspace | |
1548 | * restarting */ | |
67d12145 | 1549 | ret = task_work_add(parent, newwork, true); |
413cd3d9 ON |
1550 | if (!ret) |
1551 | newwork = NULL; | |
1552 | unlock: | |
ee18d64c | 1553 | write_unlock_irq(&tasklist_lock); |
9d1ac65a | 1554 | rcu_read_unlock(); |
67d12145 AV |
1555 | if (oldwork) |
1556 | put_cred(container_of(oldwork, struct cred, rcu)); | |
1557 | if (newwork) | |
1558 | put_cred(cred); | |
ee18d64c DH |
1559 | return ret; |
1560 | ||
1561 | error_keyring: | |
1562 | key_ref_put(keyring_r); | |
1563 | return ret; | |
1564 | } | |
1565 | ||
1da177e4 | 1566 | /* |
973c9f4f | 1567 | * The key control system call |
1da177e4 | 1568 | */ |
938bb9f5 HC |
1569 | SYSCALL_DEFINE5(keyctl, int, option, unsigned long, arg2, unsigned long, arg3, |
1570 | unsigned long, arg4, unsigned long, arg5) | |
1da177e4 LT |
1571 | { |
1572 | switch (option) { | |
1573 | case KEYCTL_GET_KEYRING_ID: | |
1574 | return keyctl_get_keyring_ID((key_serial_t) arg2, | |
1575 | (int) arg3); | |
1576 | ||
1577 | case KEYCTL_JOIN_SESSION_KEYRING: | |
1578 | return keyctl_join_session_keyring((const char __user *) arg2); | |
1579 | ||
1580 | case KEYCTL_UPDATE: | |
1581 | return keyctl_update_key((key_serial_t) arg2, | |
1582 | (const void __user *) arg3, | |
1583 | (size_t) arg4); | |
1584 | ||
1585 | case KEYCTL_REVOKE: | |
1586 | return keyctl_revoke_key((key_serial_t) arg2); | |
1587 | ||
1588 | case KEYCTL_DESCRIBE: | |
1589 | return keyctl_describe_key((key_serial_t) arg2, | |
1590 | (char __user *) arg3, | |
1591 | (unsigned) arg4); | |
1592 | ||
1593 | case KEYCTL_CLEAR: | |
1594 | return keyctl_keyring_clear((key_serial_t) arg2); | |
1595 | ||
1596 | case KEYCTL_LINK: | |
1597 | return keyctl_keyring_link((key_serial_t) arg2, | |
1598 | (key_serial_t) arg3); | |
1599 | ||
1600 | case KEYCTL_UNLINK: | |
1601 | return keyctl_keyring_unlink((key_serial_t) arg2, | |
1602 | (key_serial_t) arg3); | |
1603 | ||
1604 | case KEYCTL_SEARCH: | |
1605 | return keyctl_keyring_search((key_serial_t) arg2, | |
1606 | (const char __user *) arg3, | |
1607 | (const char __user *) arg4, | |
1608 | (key_serial_t) arg5); | |
1609 | ||
1610 | case KEYCTL_READ: | |
1611 | return keyctl_read_key((key_serial_t) arg2, | |
1612 | (char __user *) arg3, | |
1613 | (size_t) arg4); | |
1614 | ||
1615 | case KEYCTL_CHOWN: | |
1616 | return keyctl_chown_key((key_serial_t) arg2, | |
1617 | (uid_t) arg3, | |
1618 | (gid_t) arg4); | |
1619 | ||
1620 | case KEYCTL_SETPERM: | |
1621 | return keyctl_setperm_key((key_serial_t) arg2, | |
1622 | (key_perm_t) arg3); | |
1623 | ||
1624 | case KEYCTL_INSTANTIATE: | |
1625 | return keyctl_instantiate_key((key_serial_t) arg2, | |
1626 | (const void __user *) arg3, | |
1627 | (size_t) arg4, | |
1628 | (key_serial_t) arg5); | |
1629 | ||
1630 | case KEYCTL_NEGATE: | |
1631 | return keyctl_negate_key((key_serial_t) arg2, | |
1632 | (unsigned) arg3, | |
1633 | (key_serial_t) arg4); | |
1634 | ||
3e30148c DH |
1635 | case KEYCTL_SET_REQKEY_KEYRING: |
1636 | return keyctl_set_reqkey_keyring(arg2); | |
1637 | ||
017679c4 DH |
1638 | case KEYCTL_SET_TIMEOUT: |
1639 | return keyctl_set_timeout((key_serial_t) arg2, | |
1640 | (unsigned) arg3); | |
1641 | ||
b5f545c8 DH |
1642 | case KEYCTL_ASSUME_AUTHORITY: |
1643 | return keyctl_assume_authority((key_serial_t) arg2); | |
1644 | ||
70a5bb72 DH |
1645 | case KEYCTL_GET_SECURITY: |
1646 | return keyctl_get_security((key_serial_t) arg2, | |
90bd49ab | 1647 | (char __user *) arg3, |
70a5bb72 DH |
1648 | (size_t) arg4); |
1649 | ||
ee18d64c DH |
1650 | case KEYCTL_SESSION_TO_PARENT: |
1651 | return keyctl_session_to_parent(); | |
1652 | ||
fdd1b945 DH |
1653 | case KEYCTL_REJECT: |
1654 | return keyctl_reject_key((key_serial_t) arg2, | |
1655 | (unsigned) arg3, | |
1656 | (unsigned) arg4, | |
1657 | (key_serial_t) arg5); | |
1658 | ||
ee009e4a DH |
1659 | case KEYCTL_INSTANTIATE_IOV: |
1660 | return keyctl_instantiate_key_iov( | |
1661 | (key_serial_t) arg2, | |
1662 | (const struct iovec __user *) arg3, | |
1663 | (unsigned) arg4, | |
1664 | (key_serial_t) arg5); | |
1665 | ||
fd75815f DH |
1666 | case KEYCTL_INVALIDATE: |
1667 | return keyctl_invalidate_key((key_serial_t) arg2); | |
1668 | ||
1da177e4 LT |
1669 | default: |
1670 | return -EOPNOTSUPP; | |
1671 | } | |
a8b17ed0 | 1672 | } |