Commit | Line | Data |
---|---|---|
973c9f4f | 1 | /* Userspace key control operations |
1da177e4 | 2 | * |
3e30148c | 3 | * Copyright (C) 2004-5 Red Hat, Inc. All Rights Reserved. |
1da177e4 LT |
4 | * Written by David Howells (dhowells@redhat.com) |
5 | * | |
6 | * This program is free software; you can redistribute it and/or | |
7 | * modify it under the terms of the GNU General Public License | |
8 | * as published by the Free Software Foundation; either version | |
9 | * 2 of the License, or (at your option) any later version. | |
10 | */ | |
11 | ||
12 | #include <linux/module.h> | |
13 | #include <linux/init.h> | |
14 | #include <linux/sched.h> | |
15 | #include <linux/slab.h> | |
16 | #include <linux/syscalls.h> | |
59e6b9c1 | 17 | #include <linux/key.h> |
1da177e4 LT |
18 | #include <linux/keyctl.h> |
19 | #include <linux/fs.h> | |
c59ede7b | 20 | #include <linux/capability.h> |
0cb409d9 | 21 | #include <linux/string.h> |
1da177e4 | 22 | #include <linux/err.h> |
38bbca6b | 23 | #include <linux/vmalloc.h> |
70a5bb72 | 24 | #include <linux/security.h> |
a27bb332 | 25 | #include <linux/uio.h> |
1da177e4 LT |
26 | #include <asm/uaccess.h> |
27 | #include "internal.h" | |
28 | ||
0cb409d9 DA |
29 | static int key_get_type_from_user(char *type, |
30 | const char __user *_type, | |
31 | unsigned len) | |
32 | { | |
33 | int ret; | |
34 | ||
35 | ret = strncpy_from_user(type, _type, len); | |
0cb409d9 | 36 | if (ret < 0) |
4303ef19 | 37 | return ret; |
0cb409d9 DA |
38 | if (ret == 0 || ret >= len) |
39 | return -EINVAL; | |
54e2c2c1 DH |
40 | if (type[0] == '.') |
41 | return -EPERM; | |
0cb409d9 | 42 | type[len - 1] = '\0'; |
0cb409d9 DA |
43 | return 0; |
44 | } | |
45 | ||
1da177e4 | 46 | /* |
973c9f4f DH |
47 | * Extract the description of a new key from userspace and either add it as a |
48 | * new key to the specified keyring or update a matching key in that keyring. | |
49 | * | |
cf7f601c DH |
50 | * If the description is NULL or an empty string, the key type is asked to |
51 | * generate one from the payload. | |
52 | * | |
973c9f4f DH |
53 | * The keyring must be writable so that we can attach the key to it. |
54 | * | |
55 | * If successful, the new key's serial number is returned, otherwise an error | |
56 | * code is returned. | |
1da177e4 | 57 | */ |
1e7bfb21 HC |
58 | SYSCALL_DEFINE5(add_key, const char __user *, _type, |
59 | const char __user *, _description, | |
60 | const void __user *, _payload, | |
61 | size_t, plen, | |
62 | key_serial_t, ringid) | |
1da177e4 | 63 | { |
664cceb0 | 64 | key_ref_t keyring_ref, key_ref; |
1da177e4 LT |
65 | char type[32], *description; |
66 | void *payload; | |
0cb409d9 | 67 | long ret; |
38bbca6b | 68 | bool vm; |
1da177e4 LT |
69 | |
70 | ret = -EINVAL; | |
38bbca6b | 71 | if (plen > 1024 * 1024 - 1) |
1da177e4 LT |
72 | goto error; |
73 | ||
74 | /* draw all the data into kernel space */ | |
0cb409d9 | 75 | ret = key_get_type_from_user(type, _type, sizeof(type)); |
1da177e4 LT |
76 | if (ret < 0) |
77 | goto error; | |
1da177e4 | 78 | |
cf7f601c DH |
79 | description = NULL; |
80 | if (_description) { | |
81 | description = strndup_user(_description, PAGE_SIZE); | |
82 | if (IS_ERR(description)) { | |
83 | ret = PTR_ERR(description); | |
84 | goto error; | |
85 | } | |
86 | if (!*description) { | |
87 | kfree(description); | |
88 | description = NULL; | |
a4e3b8d7 MZ |
89 | } else if ((description[0] == '.') && |
90 | (strncmp(type, "keyring", 7) == 0)) { | |
91 | ret = -EPERM; | |
92 | goto error2; | |
cf7f601c | 93 | } |
0cb409d9 | 94 | } |
1da177e4 LT |
95 | |
96 | /* pull the payload in if one was supplied */ | |
97 | payload = NULL; | |
98 | ||
38bbca6b | 99 | vm = false; |
1da177e4 LT |
100 | if (_payload) { |
101 | ret = -ENOMEM; | |
4f1c28d2 | 102 | payload = kmalloc(plen, GFP_KERNEL | __GFP_NOWARN); |
38bbca6b DH |
103 | if (!payload) { |
104 | if (plen <= PAGE_SIZE) | |
105 | goto error2; | |
106 | vm = true; | |
107 | payload = vmalloc(plen); | |
108 | if (!payload) | |
109 | goto error2; | |
110 | } | |
1da177e4 LT |
111 | |
112 | ret = -EFAULT; | |
113 | if (copy_from_user(payload, _payload, plen) != 0) | |
114 | goto error3; | |
115 | } | |
116 | ||
117 | /* find the target keyring (which must be writable) */ | |
f5895943 | 118 | keyring_ref = lookup_user_key(ringid, KEY_LOOKUP_CREATE, KEY_NEED_WRITE); |
664cceb0 DH |
119 | if (IS_ERR(keyring_ref)) { |
120 | ret = PTR_ERR(keyring_ref); | |
1da177e4 LT |
121 | goto error3; |
122 | } | |
123 | ||
124 | /* create or update the requested key and add it to the target | |
125 | * keyring */ | |
664cceb0 | 126 | key_ref = key_create_or_update(keyring_ref, type, description, |
6b79ccb5 AR |
127 | payload, plen, KEY_PERM_UNDEF, |
128 | KEY_ALLOC_IN_QUOTA); | |
664cceb0 DH |
129 | if (!IS_ERR(key_ref)) { |
130 | ret = key_ref_to_ptr(key_ref)->serial; | |
131 | key_ref_put(key_ref); | |
1da177e4 LT |
132 | } |
133 | else { | |
664cceb0 | 134 | ret = PTR_ERR(key_ref); |
1da177e4 LT |
135 | } |
136 | ||
664cceb0 | 137 | key_ref_put(keyring_ref); |
1da177e4 | 138 | error3: |
38bbca6b DH |
139 | if (!vm) |
140 | kfree(payload); | |
141 | else | |
142 | vfree(payload); | |
1da177e4 LT |
143 | error2: |
144 | kfree(description); | |
145 | error: | |
146 | return ret; | |
a8b17ed0 | 147 | } |
1da177e4 | 148 | |
1da177e4 | 149 | /* |
973c9f4f DH |
150 | * Search the process keyrings and keyring trees linked from those for a |
151 | * matching key. Keyrings must have appropriate Search permission to be | |
152 | * searched. | |
153 | * | |
154 | * If a key is found, it will be attached to the destination keyring if there's | |
155 | * one specified and the serial number of the key will be returned. | |
156 | * | |
157 | * If no key is found, /sbin/request-key will be invoked if _callout_info is | |
158 | * non-NULL in an attempt to create a key. The _callout_info string will be | |
159 | * passed to /sbin/request-key to aid with completing the request. If the | |
160 | * _callout_info string is "" then it will be changed to "-". | |
1da177e4 | 161 | */ |
1e7bfb21 HC |
162 | SYSCALL_DEFINE4(request_key, const char __user *, _type, |
163 | const char __user *, _description, | |
164 | const char __user *, _callout_info, | |
165 | key_serial_t, destringid) | |
1da177e4 LT |
166 | { |
167 | struct key_type *ktype; | |
664cceb0 DH |
168 | struct key *key; |
169 | key_ref_t dest_ref; | |
4a38e122 | 170 | size_t callout_len; |
1da177e4 | 171 | char type[32], *description, *callout_info; |
0cb409d9 | 172 | long ret; |
1da177e4 LT |
173 | |
174 | /* pull the type into kernel space */ | |
0cb409d9 | 175 | ret = key_get_type_from_user(type, _type, sizeof(type)); |
1da177e4 LT |
176 | if (ret < 0) |
177 | goto error; | |
1260f801 | 178 | |
1da177e4 | 179 | /* pull the description into kernel space */ |
0cb409d9 DA |
180 | description = strndup_user(_description, PAGE_SIZE); |
181 | if (IS_ERR(description)) { | |
182 | ret = PTR_ERR(description); | |
1da177e4 | 183 | goto error; |
0cb409d9 | 184 | } |
1da177e4 LT |
185 | |
186 | /* pull the callout info into kernel space */ | |
187 | callout_info = NULL; | |
4a38e122 | 188 | callout_len = 0; |
1da177e4 | 189 | if (_callout_info) { |
0cb409d9 DA |
190 | callout_info = strndup_user(_callout_info, PAGE_SIZE); |
191 | if (IS_ERR(callout_info)) { | |
192 | ret = PTR_ERR(callout_info); | |
1da177e4 | 193 | goto error2; |
0cb409d9 | 194 | } |
4a38e122 | 195 | callout_len = strlen(callout_info); |
1da177e4 LT |
196 | } |
197 | ||
198 | /* get the destination keyring if specified */ | |
664cceb0 | 199 | dest_ref = NULL; |
1da177e4 | 200 | if (destringid) { |
5593122e | 201 | dest_ref = lookup_user_key(destringid, KEY_LOOKUP_CREATE, |
f5895943 | 202 | KEY_NEED_WRITE); |
664cceb0 DH |
203 | if (IS_ERR(dest_ref)) { |
204 | ret = PTR_ERR(dest_ref); | |
1da177e4 LT |
205 | goto error3; |
206 | } | |
207 | } | |
208 | ||
209 | /* find the key type */ | |
210 | ktype = key_type_lookup(type); | |
211 | if (IS_ERR(ktype)) { | |
212 | ret = PTR_ERR(ktype); | |
213 | goto error4; | |
214 | } | |
215 | ||
216 | /* do the search */ | |
4a38e122 DH |
217 | key = request_key_and_link(ktype, description, callout_info, |
218 | callout_len, NULL, key_ref_to_ptr(dest_ref), | |
7e047ef5 | 219 | KEY_ALLOC_IN_QUOTA); |
1da177e4 LT |
220 | if (IS_ERR(key)) { |
221 | ret = PTR_ERR(key); | |
222 | goto error5; | |
223 | } | |
224 | ||
4aab1e89 DH |
225 | /* wait for the key to finish being constructed */ |
226 | ret = wait_for_key_construction(key, 1); | |
227 | if (ret < 0) | |
228 | goto error6; | |
229 | ||
1da177e4 LT |
230 | ret = key->serial; |
231 | ||
4aab1e89 | 232 | error6: |
3e30148c | 233 | key_put(key); |
c5b60b5e | 234 | error5: |
1da177e4 | 235 | key_type_put(ktype); |
c5b60b5e | 236 | error4: |
664cceb0 | 237 | key_ref_put(dest_ref); |
c5b60b5e | 238 | error3: |
1da177e4 | 239 | kfree(callout_info); |
c5b60b5e | 240 | error2: |
1da177e4 | 241 | kfree(description); |
c5b60b5e | 242 | error: |
1da177e4 | 243 | return ret; |
a8b17ed0 | 244 | } |
1da177e4 | 245 | |
1da177e4 | 246 | /* |
973c9f4f DH |
247 | * Get the ID of the specified process keyring. |
248 | * | |
249 | * The requested keyring must have search permission to be found. | |
250 | * | |
251 | * If successful, the ID of the requested keyring will be returned. | |
1da177e4 LT |
252 | */ |
253 | long keyctl_get_keyring_ID(key_serial_t id, int create) | |
254 | { | |
664cceb0 | 255 | key_ref_t key_ref; |
5593122e | 256 | unsigned long lflags; |
1da177e4 LT |
257 | long ret; |
258 | ||
5593122e | 259 | lflags = create ? KEY_LOOKUP_CREATE : 0; |
f5895943 | 260 | key_ref = lookup_user_key(id, lflags, KEY_NEED_SEARCH); |
664cceb0 DH |
261 | if (IS_ERR(key_ref)) { |
262 | ret = PTR_ERR(key_ref); | |
1da177e4 LT |
263 | goto error; |
264 | } | |
265 | ||
664cceb0 DH |
266 | ret = key_ref_to_ptr(key_ref)->serial; |
267 | key_ref_put(key_ref); | |
c5b60b5e | 268 | error: |
1da177e4 | 269 | return ret; |
973c9f4f | 270 | } |
1da177e4 | 271 | |
1da177e4 | 272 | /* |
973c9f4f DH |
273 | * Join a (named) session keyring. |
274 | * | |
275 | * Create and join an anonymous session keyring or join a named session | |
276 | * keyring, creating it if necessary. A named session keyring must have Search | |
277 | * permission for it to be joined. Session keyrings without this permit will | |
278 | * be skipped over. | |
279 | * | |
280 | * If successful, the ID of the joined session keyring will be returned. | |
1da177e4 LT |
281 | */ |
282 | long keyctl_join_session_keyring(const char __user *_name) | |
283 | { | |
284 | char *name; | |
0cb409d9 | 285 | long ret; |
1da177e4 LT |
286 | |
287 | /* fetch the name from userspace */ | |
288 | name = NULL; | |
289 | if (_name) { | |
0cb409d9 DA |
290 | name = strndup_user(_name, PAGE_SIZE); |
291 | if (IS_ERR(name)) { | |
292 | ret = PTR_ERR(name); | |
1da177e4 | 293 | goto error; |
0cb409d9 | 294 | } |
1da177e4 LT |
295 | } |
296 | ||
297 | /* join the session */ | |
298 | ret = join_session_keyring(name); | |
0d54ee1c | 299 | kfree(name); |
1da177e4 | 300 | |
c5b60b5e | 301 | error: |
1da177e4 | 302 | return ret; |
a8b17ed0 | 303 | } |
1da177e4 | 304 | |
1da177e4 | 305 | /* |
973c9f4f DH |
306 | * Update a key's data payload from the given data. |
307 | * | |
308 | * The key must grant the caller Write permission and the key type must support | |
309 | * updating for this to work. A negative key can be positively instantiated | |
310 | * with this call. | |
311 | * | |
312 | * If successful, 0 will be returned. If the key type does not support | |
313 | * updating, then -EOPNOTSUPP will be returned. | |
1da177e4 LT |
314 | */ |
315 | long keyctl_update_key(key_serial_t id, | |
316 | const void __user *_payload, | |
317 | size_t plen) | |
318 | { | |
664cceb0 | 319 | key_ref_t key_ref; |
1da177e4 LT |
320 | void *payload; |
321 | long ret; | |
322 | ||
323 | ret = -EINVAL; | |
324 | if (plen > PAGE_SIZE) | |
325 | goto error; | |
326 | ||
327 | /* pull the payload in if one was supplied */ | |
328 | payload = NULL; | |
329 | if (_payload) { | |
330 | ret = -ENOMEM; | |
331 | payload = kmalloc(plen, GFP_KERNEL); | |
332 | if (!payload) | |
333 | goto error; | |
334 | ||
335 | ret = -EFAULT; | |
336 | if (copy_from_user(payload, _payload, plen) != 0) | |
337 | goto error2; | |
338 | } | |
339 | ||
340 | /* find the target key (which must be writable) */ | |
f5895943 | 341 | key_ref = lookup_user_key(id, 0, KEY_NEED_WRITE); |
664cceb0 DH |
342 | if (IS_ERR(key_ref)) { |
343 | ret = PTR_ERR(key_ref); | |
1da177e4 LT |
344 | goto error2; |
345 | } | |
346 | ||
347 | /* update the key */ | |
664cceb0 | 348 | ret = key_update(key_ref, payload, plen); |
1da177e4 | 349 | |
664cceb0 | 350 | key_ref_put(key_ref); |
c5b60b5e | 351 | error2: |
1da177e4 | 352 | kfree(payload); |
c5b60b5e | 353 | error: |
1da177e4 | 354 | return ret; |
a8b17ed0 | 355 | } |
1da177e4 | 356 | |
1da177e4 | 357 | /* |
973c9f4f DH |
358 | * Revoke a key. |
359 | * | |
360 | * The key must be grant the caller Write or Setattr permission for this to | |
361 | * work. The key type should give up its quota claim when revoked. The key | |
362 | * and any links to the key will be automatically garbage collected after a | |
363 | * certain amount of time (/proc/sys/kernel/keys/gc_delay). | |
364 | * | |
365 | * If successful, 0 is returned. | |
1da177e4 LT |
366 | */ |
367 | long keyctl_revoke_key(key_serial_t id) | |
368 | { | |
664cceb0 | 369 | key_ref_t key_ref; |
1da177e4 LT |
370 | long ret; |
371 | ||
f5895943 | 372 | key_ref = lookup_user_key(id, 0, KEY_NEED_WRITE); |
664cceb0 DH |
373 | if (IS_ERR(key_ref)) { |
374 | ret = PTR_ERR(key_ref); | |
0c2c9a3f DH |
375 | if (ret != -EACCES) |
376 | goto error; | |
f5895943 | 377 | key_ref = lookup_user_key(id, 0, KEY_NEED_SETATTR); |
0c2c9a3f DH |
378 | if (IS_ERR(key_ref)) { |
379 | ret = PTR_ERR(key_ref); | |
380 | goto error; | |
381 | } | |
1da177e4 LT |
382 | } |
383 | ||
664cceb0 | 384 | key_revoke(key_ref_to_ptr(key_ref)); |
1da177e4 LT |
385 | ret = 0; |
386 | ||
664cceb0 | 387 | key_ref_put(key_ref); |
c5b60b5e | 388 | error: |
1260f801 | 389 | return ret; |
a8b17ed0 | 390 | } |
1da177e4 | 391 | |
fd75815f DH |
392 | /* |
393 | * Invalidate a key. | |
394 | * | |
395 | * The key must be grant the caller Invalidate permission for this to work. | |
396 | * The key and any links to the key will be automatically garbage collected | |
397 | * immediately. | |
398 | * | |
399 | * If successful, 0 is returned. | |
400 | */ | |
401 | long keyctl_invalidate_key(key_serial_t id) | |
402 | { | |
403 | key_ref_t key_ref; | |
404 | long ret; | |
405 | ||
406 | kenter("%d", id); | |
407 | ||
f5895943 | 408 | key_ref = lookup_user_key(id, 0, KEY_NEED_SEARCH); |
fd75815f DH |
409 | if (IS_ERR(key_ref)) { |
410 | ret = PTR_ERR(key_ref); | |
0c7774ab DH |
411 | |
412 | /* Root is permitted to invalidate certain special keys */ | |
413 | if (capable(CAP_SYS_ADMIN)) { | |
414 | key_ref = lookup_user_key(id, 0, 0); | |
415 | if (IS_ERR(key_ref)) | |
416 | goto error; | |
417 | if (test_bit(KEY_FLAG_ROOT_CAN_INVAL, | |
418 | &key_ref_to_ptr(key_ref)->flags)) | |
419 | goto invalidate; | |
420 | goto error_put; | |
421 | } | |
422 | ||
fd75815f DH |
423 | goto error; |
424 | } | |
425 | ||
0c7774ab | 426 | invalidate: |
fd75815f DH |
427 | key_invalidate(key_ref_to_ptr(key_ref)); |
428 | ret = 0; | |
0c7774ab | 429 | error_put: |
fd75815f DH |
430 | key_ref_put(key_ref); |
431 | error: | |
432 | kleave(" = %ld", ret); | |
433 | return ret; | |
434 | } | |
435 | ||
1da177e4 | 436 | /* |
973c9f4f DH |
437 | * Clear the specified keyring, creating an empty process keyring if one of the |
438 | * special keyring IDs is used. | |
439 | * | |
440 | * The keyring must grant the caller Write permission for this to work. If | |
441 | * successful, 0 will be returned. | |
1da177e4 LT |
442 | */ |
443 | long keyctl_keyring_clear(key_serial_t ringid) | |
444 | { | |
664cceb0 | 445 | key_ref_t keyring_ref; |
1da177e4 LT |
446 | long ret; |
447 | ||
f5895943 | 448 | keyring_ref = lookup_user_key(ringid, KEY_LOOKUP_CREATE, KEY_NEED_WRITE); |
664cceb0 DH |
449 | if (IS_ERR(keyring_ref)) { |
450 | ret = PTR_ERR(keyring_ref); | |
700920eb DH |
451 | |
452 | /* Root is permitted to invalidate certain special keyrings */ | |
453 | if (capable(CAP_SYS_ADMIN)) { | |
454 | keyring_ref = lookup_user_key(ringid, 0, 0); | |
455 | if (IS_ERR(keyring_ref)) | |
456 | goto error; | |
457 | if (test_bit(KEY_FLAG_ROOT_CAN_CLEAR, | |
458 | &key_ref_to_ptr(keyring_ref)->flags)) | |
459 | goto clear; | |
460 | goto error_put; | |
461 | } | |
462 | ||
1da177e4 LT |
463 | goto error; |
464 | } | |
465 | ||
700920eb | 466 | clear: |
664cceb0 | 467 | ret = keyring_clear(key_ref_to_ptr(keyring_ref)); |
700920eb | 468 | error_put: |
664cceb0 | 469 | key_ref_put(keyring_ref); |
c5b60b5e | 470 | error: |
1da177e4 | 471 | return ret; |
a8b17ed0 | 472 | } |
1da177e4 | 473 | |
1da177e4 | 474 | /* |
973c9f4f DH |
475 | * Create a link from a keyring to a key if there's no matching key in the |
476 | * keyring, otherwise replace the link to the matching key with a link to the | |
477 | * new key. | |
478 | * | |
479 | * The key must grant the caller Link permission and the the keyring must grant | |
480 | * the caller Write permission. Furthermore, if an additional link is created, | |
481 | * the keyring's quota will be extended. | |
482 | * | |
483 | * If successful, 0 will be returned. | |
1da177e4 LT |
484 | */ |
485 | long keyctl_keyring_link(key_serial_t id, key_serial_t ringid) | |
486 | { | |
664cceb0 | 487 | key_ref_t keyring_ref, key_ref; |
1da177e4 LT |
488 | long ret; |
489 | ||
f5895943 | 490 | keyring_ref = lookup_user_key(ringid, KEY_LOOKUP_CREATE, KEY_NEED_WRITE); |
664cceb0 DH |
491 | if (IS_ERR(keyring_ref)) { |
492 | ret = PTR_ERR(keyring_ref); | |
1da177e4 LT |
493 | goto error; |
494 | } | |
495 | ||
f5895943 | 496 | key_ref = lookup_user_key(id, KEY_LOOKUP_CREATE, KEY_NEED_LINK); |
664cceb0 DH |
497 | if (IS_ERR(key_ref)) { |
498 | ret = PTR_ERR(key_ref); | |
1da177e4 LT |
499 | goto error2; |
500 | } | |
501 | ||
664cceb0 | 502 | ret = key_link(key_ref_to_ptr(keyring_ref), key_ref_to_ptr(key_ref)); |
1da177e4 | 503 | |
664cceb0 | 504 | key_ref_put(key_ref); |
c5b60b5e | 505 | error2: |
664cceb0 | 506 | key_ref_put(keyring_ref); |
c5b60b5e | 507 | error: |
1da177e4 | 508 | return ret; |
a8b17ed0 | 509 | } |
1da177e4 | 510 | |
1da177e4 | 511 | /* |
973c9f4f DH |
512 | * Unlink a key from a keyring. |
513 | * | |
514 | * The keyring must grant the caller Write permission for this to work; the key | |
515 | * itself need not grant the caller anything. If the last link to a key is | |
516 | * removed then that key will be scheduled for destruction. | |
517 | * | |
518 | * If successful, 0 will be returned. | |
1da177e4 LT |
519 | */ |
520 | long keyctl_keyring_unlink(key_serial_t id, key_serial_t ringid) | |
521 | { | |
664cceb0 | 522 | key_ref_t keyring_ref, key_ref; |
1da177e4 LT |
523 | long ret; |
524 | ||
f5895943 | 525 | keyring_ref = lookup_user_key(ringid, 0, KEY_NEED_WRITE); |
664cceb0 DH |
526 | if (IS_ERR(keyring_ref)) { |
527 | ret = PTR_ERR(keyring_ref); | |
1da177e4 LT |
528 | goto error; |
529 | } | |
530 | ||
5593122e | 531 | key_ref = lookup_user_key(id, KEY_LOOKUP_FOR_UNLINK, 0); |
664cceb0 DH |
532 | if (IS_ERR(key_ref)) { |
533 | ret = PTR_ERR(key_ref); | |
1da177e4 LT |
534 | goto error2; |
535 | } | |
536 | ||
664cceb0 | 537 | ret = key_unlink(key_ref_to_ptr(keyring_ref), key_ref_to_ptr(key_ref)); |
1da177e4 | 538 | |
664cceb0 | 539 | key_ref_put(key_ref); |
c5b60b5e | 540 | error2: |
664cceb0 | 541 | key_ref_put(keyring_ref); |
c5b60b5e | 542 | error: |
1da177e4 | 543 | return ret; |
a8b17ed0 | 544 | } |
1da177e4 | 545 | |
1da177e4 | 546 | /* |
973c9f4f DH |
547 | * Return a description of a key to userspace. |
548 | * | |
549 | * The key must grant the caller View permission for this to work. | |
550 | * | |
551 | * If there's a buffer, we place up to buflen bytes of data into it formatted | |
552 | * in the following way: | |
553 | * | |
1da177e4 | 554 | * type;uid;gid;perm;description<NUL> |
973c9f4f DH |
555 | * |
556 | * If successful, we return the amount of description available, irrespective | |
557 | * of how much we may have copied into the buffer. | |
1da177e4 LT |
558 | */ |
559 | long keyctl_describe_key(key_serial_t keyid, | |
560 | char __user *buffer, | |
561 | size_t buflen) | |
562 | { | |
3e30148c | 563 | struct key *key, *instkey; |
664cceb0 | 564 | key_ref_t key_ref; |
1da177e4 LT |
565 | char *tmpbuf; |
566 | long ret; | |
567 | ||
f5895943 | 568 | key_ref = lookup_user_key(keyid, KEY_LOOKUP_PARTIAL, KEY_NEED_VIEW); |
664cceb0 | 569 | if (IS_ERR(key_ref)) { |
3e30148c DH |
570 | /* viewing a key under construction is permitted if we have the |
571 | * authorisation token handy */ | |
664cceb0 | 572 | if (PTR_ERR(key_ref) == -EACCES) { |
3e30148c DH |
573 | instkey = key_get_instantiation_authkey(keyid); |
574 | if (!IS_ERR(instkey)) { | |
575 | key_put(instkey); | |
8bbf4976 | 576 | key_ref = lookup_user_key(keyid, |
5593122e DH |
577 | KEY_LOOKUP_PARTIAL, |
578 | 0); | |
664cceb0 | 579 | if (!IS_ERR(key_ref)) |
3e30148c DH |
580 | goto okay; |
581 | } | |
582 | } | |
583 | ||
664cceb0 | 584 | ret = PTR_ERR(key_ref); |
1da177e4 LT |
585 | goto error; |
586 | } | |
587 | ||
3e30148c | 588 | okay: |
1da177e4 LT |
589 | /* calculate how much description we're going to return */ |
590 | ret = -ENOMEM; | |
591 | tmpbuf = kmalloc(PAGE_SIZE, GFP_KERNEL); | |
592 | if (!tmpbuf) | |
593 | goto error2; | |
594 | ||
664cceb0 DH |
595 | key = key_ref_to_ptr(key_ref); |
596 | ||
1da177e4 | 597 | ret = snprintf(tmpbuf, PAGE_SIZE - 1, |
664cceb0 | 598 | "%s;%d;%d;%08x;%s", |
94fd8405 | 599 | key->type->name, |
9a56c2db EB |
600 | from_kuid_munged(current_user_ns(), key->uid), |
601 | from_kgid_munged(current_user_ns(), key->gid), | |
94fd8405 DH |
602 | key->perm, |
603 | key->description ?: ""); | |
1da177e4 LT |
604 | |
605 | /* include a NUL char at the end of the data */ | |
606 | if (ret > PAGE_SIZE - 1) | |
607 | ret = PAGE_SIZE - 1; | |
608 | tmpbuf[ret] = 0; | |
609 | ret++; | |
610 | ||
611 | /* consider returning the data */ | |
612 | if (buffer && buflen > 0) { | |
613 | if (buflen > ret) | |
614 | buflen = ret; | |
615 | ||
616 | if (copy_to_user(buffer, tmpbuf, buflen) != 0) | |
617 | ret = -EFAULT; | |
618 | } | |
619 | ||
620 | kfree(tmpbuf); | |
c5b60b5e | 621 | error2: |
664cceb0 | 622 | key_ref_put(key_ref); |
c5b60b5e | 623 | error: |
1da177e4 | 624 | return ret; |
a8b17ed0 | 625 | } |
1da177e4 | 626 | |
1da177e4 | 627 | /* |
973c9f4f DH |
628 | * Search the specified keyring and any keyrings it links to for a matching |
629 | * key. Only keyrings that grant the caller Search permission will be searched | |
630 | * (this includes the starting keyring). Only keys with Search permission can | |
631 | * be found. | |
632 | * | |
633 | * If successful, the found key will be linked to the destination keyring if | |
634 | * supplied and the key has Link permission, and the found key ID will be | |
635 | * returned. | |
1da177e4 LT |
636 | */ |
637 | long keyctl_keyring_search(key_serial_t ringid, | |
638 | const char __user *_type, | |
639 | const char __user *_description, | |
640 | key_serial_t destringid) | |
641 | { | |
642 | struct key_type *ktype; | |
664cceb0 | 643 | key_ref_t keyring_ref, key_ref, dest_ref; |
1da177e4 | 644 | char type[32], *description; |
0cb409d9 | 645 | long ret; |
1da177e4 LT |
646 | |
647 | /* pull the type and description into kernel space */ | |
0cb409d9 | 648 | ret = key_get_type_from_user(type, _type, sizeof(type)); |
1da177e4 LT |
649 | if (ret < 0) |
650 | goto error; | |
1da177e4 | 651 | |
0cb409d9 DA |
652 | description = strndup_user(_description, PAGE_SIZE); |
653 | if (IS_ERR(description)) { | |
654 | ret = PTR_ERR(description); | |
1da177e4 | 655 | goto error; |
0cb409d9 | 656 | } |
1da177e4 LT |
657 | |
658 | /* get the keyring at which to begin the search */ | |
f5895943 | 659 | keyring_ref = lookup_user_key(ringid, 0, KEY_NEED_SEARCH); |
664cceb0 DH |
660 | if (IS_ERR(keyring_ref)) { |
661 | ret = PTR_ERR(keyring_ref); | |
1da177e4 LT |
662 | goto error2; |
663 | } | |
664 | ||
665 | /* get the destination keyring if specified */ | |
664cceb0 | 666 | dest_ref = NULL; |
1da177e4 | 667 | if (destringid) { |
5593122e | 668 | dest_ref = lookup_user_key(destringid, KEY_LOOKUP_CREATE, |
f5895943 | 669 | KEY_NEED_WRITE); |
664cceb0 DH |
670 | if (IS_ERR(dest_ref)) { |
671 | ret = PTR_ERR(dest_ref); | |
1da177e4 LT |
672 | goto error3; |
673 | } | |
674 | } | |
675 | ||
676 | /* find the key type */ | |
677 | ktype = key_type_lookup(type); | |
678 | if (IS_ERR(ktype)) { | |
679 | ret = PTR_ERR(ktype); | |
680 | goto error4; | |
681 | } | |
682 | ||
683 | /* do the search */ | |
664cceb0 DH |
684 | key_ref = keyring_search(keyring_ref, ktype, description); |
685 | if (IS_ERR(key_ref)) { | |
686 | ret = PTR_ERR(key_ref); | |
1da177e4 LT |
687 | |
688 | /* treat lack or presence of a negative key the same */ | |
689 | if (ret == -EAGAIN) | |
690 | ret = -ENOKEY; | |
691 | goto error5; | |
692 | } | |
693 | ||
694 | /* link the resulting key to the destination keyring if we can */ | |
664cceb0 | 695 | if (dest_ref) { |
f5895943 | 696 | ret = key_permission(key_ref, KEY_NEED_LINK); |
29db9190 | 697 | if (ret < 0) |
1da177e4 LT |
698 | goto error6; |
699 | ||
664cceb0 | 700 | ret = key_link(key_ref_to_ptr(dest_ref), key_ref_to_ptr(key_ref)); |
1da177e4 LT |
701 | if (ret < 0) |
702 | goto error6; | |
703 | } | |
704 | ||
664cceb0 | 705 | ret = key_ref_to_ptr(key_ref)->serial; |
1da177e4 | 706 | |
c5b60b5e | 707 | error6: |
664cceb0 | 708 | key_ref_put(key_ref); |
c5b60b5e | 709 | error5: |
1da177e4 | 710 | key_type_put(ktype); |
c5b60b5e | 711 | error4: |
664cceb0 | 712 | key_ref_put(dest_ref); |
c5b60b5e | 713 | error3: |
664cceb0 | 714 | key_ref_put(keyring_ref); |
c5b60b5e | 715 | error2: |
1da177e4 | 716 | kfree(description); |
c5b60b5e | 717 | error: |
1da177e4 | 718 | return ret; |
a8b17ed0 | 719 | } |
1da177e4 | 720 | |
1da177e4 | 721 | /* |
973c9f4f DH |
722 | * Read a key's payload. |
723 | * | |
724 | * The key must either grant the caller Read permission, or it must grant the | |
725 | * caller Search permission when searched for from the process keyrings. | |
726 | * | |
727 | * If successful, we place up to buflen bytes of data into the buffer, if one | |
728 | * is provided, and return the amount of data that is available in the key, | |
729 | * irrespective of how much we copied into the buffer. | |
1da177e4 LT |
730 | */ |
731 | long keyctl_read_key(key_serial_t keyid, char __user *buffer, size_t buflen) | |
732 | { | |
664cceb0 DH |
733 | struct key *key; |
734 | key_ref_t key_ref; | |
1da177e4 LT |
735 | long ret; |
736 | ||
737 | /* find the key first */ | |
5593122e | 738 | key_ref = lookup_user_key(keyid, 0, 0); |
664cceb0 DH |
739 | if (IS_ERR(key_ref)) { |
740 | ret = -ENOKEY; | |
741 | goto error; | |
1da177e4 LT |
742 | } |
743 | ||
664cceb0 DH |
744 | key = key_ref_to_ptr(key_ref); |
745 | ||
746 | /* see if we can read it directly */ | |
f5895943 | 747 | ret = key_permission(key_ref, KEY_NEED_READ); |
29db9190 | 748 | if (ret == 0) |
664cceb0 | 749 | goto can_read_key; |
29db9190 DH |
750 | if (ret != -EACCES) |
751 | goto error; | |
664cceb0 DH |
752 | |
753 | /* we can't; see if it's searchable from this process's keyrings | |
754 | * - we automatically take account of the fact that it may be | |
755 | * dangling off an instantiation key | |
756 | */ | |
757 | if (!is_key_possessed(key_ref)) { | |
758 | ret = -EACCES; | |
759 | goto error2; | |
760 | } | |
1da177e4 LT |
761 | |
762 | /* the key is probably readable - now try to read it */ | |
c5b60b5e | 763 | can_read_key: |
1da177e4 LT |
764 | ret = key_validate(key); |
765 | if (ret == 0) { | |
766 | ret = -EOPNOTSUPP; | |
767 | if (key->type->read) { | |
768 | /* read the data with the semaphore held (since we | |
769 | * might sleep) */ | |
770 | down_read(&key->sem); | |
771 | ret = key->type->read(key, buffer, buflen); | |
772 | up_read(&key->sem); | |
773 | } | |
774 | } | |
775 | ||
c5b60b5e | 776 | error2: |
1da177e4 | 777 | key_put(key); |
c5b60b5e | 778 | error: |
1da177e4 | 779 | return ret; |
a8b17ed0 | 780 | } |
1da177e4 | 781 | |
1da177e4 | 782 | /* |
973c9f4f DH |
783 | * Change the ownership of a key |
784 | * | |
785 | * The key must grant the caller Setattr permission for this to work, though | |
786 | * the key need not be fully instantiated yet. For the UID to be changed, or | |
787 | * for the GID to be changed to a group the caller is not a member of, the | |
788 | * caller must have sysadmin capability. If either uid or gid is -1 then that | |
789 | * attribute is not changed. | |
790 | * | |
791 | * If the UID is to be changed, the new user must have sufficient quota to | |
792 | * accept the key. The quota deduction will be removed from the old user to | |
793 | * the new user should the attribute be changed. | |
794 | * | |
795 | * If successful, 0 will be returned. | |
1da177e4 | 796 | */ |
9a56c2db | 797 | long keyctl_chown_key(key_serial_t id, uid_t user, gid_t group) |
1da177e4 | 798 | { |
5801649d | 799 | struct key_user *newowner, *zapowner = NULL; |
1da177e4 | 800 | struct key *key; |
664cceb0 | 801 | key_ref_t key_ref; |
1da177e4 | 802 | long ret; |
9a56c2db EB |
803 | kuid_t uid; |
804 | kgid_t gid; | |
805 | ||
806 | uid = make_kuid(current_user_ns(), user); | |
807 | gid = make_kgid(current_user_ns(), group); | |
808 | ret = -EINVAL; | |
809 | if ((user != (uid_t) -1) && !uid_valid(uid)) | |
810 | goto error; | |
811 | if ((group != (gid_t) -1) && !gid_valid(gid)) | |
812 | goto error; | |
1da177e4 LT |
813 | |
814 | ret = 0; | |
9a56c2db | 815 | if (user == (uid_t) -1 && group == (gid_t) -1) |
1da177e4 LT |
816 | goto error; |
817 | ||
5593122e | 818 | key_ref = lookup_user_key(id, KEY_LOOKUP_CREATE | KEY_LOOKUP_PARTIAL, |
f5895943 | 819 | KEY_NEED_SETATTR); |
664cceb0 DH |
820 | if (IS_ERR(key_ref)) { |
821 | ret = PTR_ERR(key_ref); | |
1da177e4 LT |
822 | goto error; |
823 | } | |
824 | ||
664cceb0 DH |
825 | key = key_ref_to_ptr(key_ref); |
826 | ||
1da177e4 LT |
827 | /* make the changes with the locks held to prevent chown/chown races */ |
828 | ret = -EACCES; | |
829 | down_write(&key->sem); | |
1da177e4 LT |
830 | |
831 | if (!capable(CAP_SYS_ADMIN)) { | |
832 | /* only the sysadmin can chown a key to some other UID */ | |
9a56c2db | 833 | if (user != (uid_t) -1 && !uid_eq(key->uid, uid)) |
5801649d | 834 | goto error_put; |
1da177e4 LT |
835 | |
836 | /* only the sysadmin can set the key's GID to a group other | |
837 | * than one of those that the current process subscribes to */ | |
9a56c2db | 838 | if (group != (gid_t) -1 && !gid_eq(gid, key->gid) && !in_group_p(gid)) |
5801649d | 839 | goto error_put; |
1da177e4 LT |
840 | } |
841 | ||
5801649d | 842 | /* change the UID */ |
9a56c2db | 843 | if (user != (uid_t) -1 && !uid_eq(uid, key->uid)) { |
5801649d | 844 | ret = -ENOMEM; |
9a56c2db | 845 | newowner = key_user_lookup(uid); |
5801649d FT |
846 | if (!newowner) |
847 | goto error_put; | |
848 | ||
849 | /* transfer the quota burden to the new user */ | |
850 | if (test_bit(KEY_FLAG_IN_QUOTA, &key->flags)) { | |
9a56c2db | 851 | unsigned maxkeys = uid_eq(uid, GLOBAL_ROOT_UID) ? |
0b77f5bf | 852 | key_quota_root_maxkeys : key_quota_maxkeys; |
9a56c2db | 853 | unsigned maxbytes = uid_eq(uid, GLOBAL_ROOT_UID) ? |
0b77f5bf DH |
854 | key_quota_root_maxbytes : key_quota_maxbytes; |
855 | ||
5801649d | 856 | spin_lock(&newowner->lock); |
0b77f5bf DH |
857 | if (newowner->qnkeys + 1 >= maxkeys || |
858 | newowner->qnbytes + key->quotalen >= maxbytes || | |
859 | newowner->qnbytes + key->quotalen < | |
860 | newowner->qnbytes) | |
5801649d FT |
861 | goto quota_overrun; |
862 | ||
863 | newowner->qnkeys++; | |
864 | newowner->qnbytes += key->quotalen; | |
865 | spin_unlock(&newowner->lock); | |
866 | ||
867 | spin_lock(&key->user->lock); | |
868 | key->user->qnkeys--; | |
869 | key->user->qnbytes -= key->quotalen; | |
870 | spin_unlock(&key->user->lock); | |
871 | } | |
872 | ||
873 | atomic_dec(&key->user->nkeys); | |
874 | atomic_inc(&newowner->nkeys); | |
875 | ||
876 | if (test_bit(KEY_FLAG_INSTANTIATED, &key->flags)) { | |
877 | atomic_dec(&key->user->nikeys); | |
878 | atomic_inc(&newowner->nikeys); | |
879 | } | |
880 | ||
881 | zapowner = key->user; | |
882 | key->user = newowner; | |
883 | key->uid = uid; | |
1da177e4 LT |
884 | } |
885 | ||
886 | /* change the GID */ | |
9a56c2db | 887 | if (group != (gid_t) -1) |
1da177e4 LT |
888 | key->gid = gid; |
889 | ||
890 | ret = 0; | |
891 | ||
5801649d | 892 | error_put: |
1da177e4 LT |
893 | up_write(&key->sem); |
894 | key_put(key); | |
5801649d FT |
895 | if (zapowner) |
896 | key_user_put(zapowner); | |
897 | error: | |
1da177e4 LT |
898 | return ret; |
899 | ||
5801649d FT |
900 | quota_overrun: |
901 | spin_unlock(&newowner->lock); | |
902 | zapowner = newowner; | |
903 | ret = -EDQUOT; | |
904 | goto error_put; | |
a8b17ed0 | 905 | } |
5801649d | 906 | |
1da177e4 | 907 | /* |
973c9f4f DH |
908 | * Change the permission mask on a key. |
909 | * | |
910 | * The key must grant the caller Setattr permission for this to work, though | |
911 | * the key need not be fully instantiated yet. If the caller does not have | |
912 | * sysadmin capability, it may only change the permission on keys that it owns. | |
1da177e4 LT |
913 | */ |
914 | long keyctl_setperm_key(key_serial_t id, key_perm_t perm) | |
915 | { | |
916 | struct key *key; | |
664cceb0 | 917 | key_ref_t key_ref; |
1da177e4 LT |
918 | long ret; |
919 | ||
920 | ret = -EINVAL; | |
664cceb0 | 921 | if (perm & ~(KEY_POS_ALL | KEY_USR_ALL | KEY_GRP_ALL | KEY_OTH_ALL)) |
1da177e4 LT |
922 | goto error; |
923 | ||
5593122e | 924 | key_ref = lookup_user_key(id, KEY_LOOKUP_CREATE | KEY_LOOKUP_PARTIAL, |
f5895943 | 925 | KEY_NEED_SETATTR); |
664cceb0 DH |
926 | if (IS_ERR(key_ref)) { |
927 | ret = PTR_ERR(key_ref); | |
1da177e4 LT |
928 | goto error; |
929 | } | |
930 | ||
664cceb0 DH |
931 | key = key_ref_to_ptr(key_ref); |
932 | ||
76d8aeab | 933 | /* make the changes with the locks held to prevent chown/chmod races */ |
1da177e4 LT |
934 | ret = -EACCES; |
935 | down_write(&key->sem); | |
1da177e4 | 936 | |
76d8aeab | 937 | /* if we're not the sysadmin, we can only change a key that we own */ |
9a56c2db | 938 | if (capable(CAP_SYS_ADMIN) || uid_eq(key->uid, current_fsuid())) { |
76d8aeab DH |
939 | key->perm = perm; |
940 | ret = 0; | |
941 | } | |
1da177e4 | 942 | |
1da177e4 LT |
943 | up_write(&key->sem); |
944 | key_put(key); | |
76d8aeab | 945 | error: |
1da177e4 | 946 | return ret; |
a8b17ed0 | 947 | } |
1da177e4 | 948 | |
8bbf4976 | 949 | /* |
973c9f4f DH |
950 | * Get the destination keyring for instantiation and check that the caller has |
951 | * Write permission on it. | |
8bbf4976 DH |
952 | */ |
953 | static long get_instantiation_keyring(key_serial_t ringid, | |
954 | struct request_key_auth *rka, | |
955 | struct key **_dest_keyring) | |
956 | { | |
957 | key_ref_t dkref; | |
958 | ||
eca1bf5b DH |
959 | *_dest_keyring = NULL; |
960 | ||
8bbf4976 | 961 | /* just return a NULL pointer if we weren't asked to make a link */ |
eca1bf5b | 962 | if (ringid == 0) |
8bbf4976 | 963 | return 0; |
8bbf4976 DH |
964 | |
965 | /* if a specific keyring is nominated by ID, then use that */ | |
966 | if (ringid > 0) { | |
f5895943 | 967 | dkref = lookup_user_key(ringid, KEY_LOOKUP_CREATE, KEY_NEED_WRITE); |
8bbf4976 DH |
968 | if (IS_ERR(dkref)) |
969 | return PTR_ERR(dkref); | |
970 | *_dest_keyring = key_ref_to_ptr(dkref); | |
971 | return 0; | |
972 | } | |
973 | ||
974 | if (ringid == KEY_SPEC_REQKEY_AUTH_KEY) | |
975 | return -EINVAL; | |
976 | ||
977 | /* otherwise specify the destination keyring recorded in the | |
978 | * authorisation key (any KEY_SPEC_*_KEYRING) */ | |
979 | if (ringid >= KEY_SPEC_REQUESTOR_KEYRING) { | |
21279cfa | 980 | *_dest_keyring = key_get(rka->dest_keyring); |
8bbf4976 DH |
981 | return 0; |
982 | } | |
983 | ||
984 | return -ENOKEY; | |
985 | } | |
986 | ||
d84f4f99 | 987 | /* |
973c9f4f | 988 | * Change the request_key authorisation key on the current process. |
d84f4f99 DH |
989 | */ |
990 | static int keyctl_change_reqkey_auth(struct key *key) | |
991 | { | |
992 | struct cred *new; | |
993 | ||
994 | new = prepare_creds(); | |
995 | if (!new) | |
996 | return -ENOMEM; | |
997 | ||
998 | key_put(new->request_key_auth); | |
999 | new->request_key_auth = key_get(key); | |
1000 | ||
1001 | return commit_creds(new); | |
1002 | } | |
1003 | ||
ee009e4a DH |
1004 | /* |
1005 | * Copy the iovec data from userspace | |
1006 | */ | |
1007 | static long copy_from_user_iovec(void *buffer, const struct iovec *iov, | |
1008 | unsigned ioc) | |
1009 | { | |
1010 | for (; ioc > 0; ioc--) { | |
1011 | if (copy_from_user(buffer, iov->iov_base, iov->iov_len) != 0) | |
1012 | return -EFAULT; | |
1013 | buffer += iov->iov_len; | |
1014 | iov++; | |
1015 | } | |
1016 | return 0; | |
1017 | } | |
1018 | ||
1da177e4 | 1019 | /* |
973c9f4f DH |
1020 | * Instantiate a key with the specified payload and link the key into the |
1021 | * destination keyring if one is given. | |
1022 | * | |
1023 | * The caller must have the appropriate instantiation permit set for this to | |
1024 | * work (see keyctl_assume_authority). No other permissions are required. | |
1025 | * | |
1026 | * If successful, 0 will be returned. | |
1da177e4 | 1027 | */ |
ee009e4a DH |
1028 | long keyctl_instantiate_key_common(key_serial_t id, |
1029 | const struct iovec *payload_iov, | |
1030 | unsigned ioc, | |
1031 | size_t plen, | |
1032 | key_serial_t ringid) | |
1da177e4 | 1033 | { |
d84f4f99 | 1034 | const struct cred *cred = current_cred(); |
3e30148c | 1035 | struct request_key_auth *rka; |
8bbf4976 | 1036 | struct key *instkey, *dest_keyring; |
1da177e4 LT |
1037 | void *payload; |
1038 | long ret; | |
38bbca6b | 1039 | bool vm = false; |
1da177e4 | 1040 | |
d84f4f99 DH |
1041 | kenter("%d,,%zu,%d", id, plen, ringid); |
1042 | ||
1da177e4 | 1043 | ret = -EINVAL; |
38bbca6b | 1044 | if (plen > 1024 * 1024 - 1) |
1da177e4 LT |
1045 | goto error; |
1046 | ||
b5f545c8 DH |
1047 | /* the appropriate instantiation authorisation key must have been |
1048 | * assumed before calling this */ | |
1049 | ret = -EPERM; | |
d84f4f99 | 1050 | instkey = cred->request_key_auth; |
b5f545c8 DH |
1051 | if (!instkey) |
1052 | goto error; | |
1053 | ||
1054 | rka = instkey->payload.data; | |
1055 | if (rka->target_key->serial != id) | |
1056 | goto error; | |
1057 | ||
1da177e4 LT |
1058 | /* pull the payload in if one was supplied */ |
1059 | payload = NULL; | |
1060 | ||
ee009e4a | 1061 | if (payload_iov) { |
1da177e4 LT |
1062 | ret = -ENOMEM; |
1063 | payload = kmalloc(plen, GFP_KERNEL); | |
38bbca6b DH |
1064 | if (!payload) { |
1065 | if (plen <= PAGE_SIZE) | |
1066 | goto error; | |
1067 | vm = true; | |
1068 | payload = vmalloc(plen); | |
1069 | if (!payload) | |
1070 | goto error; | |
1071 | } | |
1da177e4 | 1072 | |
ee009e4a DH |
1073 | ret = copy_from_user_iovec(payload, payload_iov, ioc); |
1074 | if (ret < 0) | |
1da177e4 LT |
1075 | goto error2; |
1076 | } | |
1077 | ||
3e30148c DH |
1078 | /* find the destination keyring amongst those belonging to the |
1079 | * requesting task */ | |
8bbf4976 DH |
1080 | ret = get_instantiation_keyring(ringid, rka, &dest_keyring); |
1081 | if (ret < 0) | |
1082 | goto error2; | |
1da177e4 LT |
1083 | |
1084 | /* instantiate the key and link it into a keyring */ | |
3e30148c | 1085 | ret = key_instantiate_and_link(rka->target_key, payload, plen, |
8bbf4976 | 1086 | dest_keyring, instkey); |
1da177e4 | 1087 | |
8bbf4976 | 1088 | key_put(dest_keyring); |
b5f545c8 DH |
1089 | |
1090 | /* discard the assumed authority if it's just been disabled by | |
1091 | * instantiation of the key */ | |
d84f4f99 DH |
1092 | if (ret == 0) |
1093 | keyctl_change_reqkey_auth(NULL); | |
b5f545c8 DH |
1094 | |
1095 | error2: | |
38bbca6b DH |
1096 | if (!vm) |
1097 | kfree(payload); | |
1098 | else | |
1099 | vfree(payload); | |
b5f545c8 | 1100 | error: |
1da177e4 | 1101 | return ret; |
a8b17ed0 | 1102 | } |
1da177e4 | 1103 | |
ee009e4a DH |
1104 | /* |
1105 | * Instantiate a key with the specified payload and link the key into the | |
1106 | * destination keyring if one is given. | |
1107 | * | |
1108 | * The caller must have the appropriate instantiation permit set for this to | |
1109 | * work (see keyctl_assume_authority). No other permissions are required. | |
1110 | * | |
1111 | * If successful, 0 will be returned. | |
1112 | */ | |
1113 | long keyctl_instantiate_key(key_serial_t id, | |
1114 | const void __user *_payload, | |
1115 | size_t plen, | |
1116 | key_serial_t ringid) | |
1117 | { | |
1118 | if (_payload && plen) { | |
1119 | struct iovec iov[1] = { | |
1120 | [0].iov_base = (void __user *)_payload, | |
1121 | [0].iov_len = plen | |
1122 | }; | |
1123 | ||
1124 | return keyctl_instantiate_key_common(id, iov, 1, plen, ringid); | |
1125 | } | |
1126 | ||
1127 | return keyctl_instantiate_key_common(id, NULL, 0, 0, ringid); | |
1128 | } | |
1129 | ||
1130 | /* | |
1131 | * Instantiate a key with the specified multipart payload and link the key into | |
1132 | * the destination keyring if one is given. | |
1133 | * | |
1134 | * The caller must have the appropriate instantiation permit set for this to | |
1135 | * work (see keyctl_assume_authority). No other permissions are required. | |
1136 | * | |
1137 | * If successful, 0 will be returned. | |
1138 | */ | |
1139 | long keyctl_instantiate_key_iov(key_serial_t id, | |
1140 | const struct iovec __user *_payload_iov, | |
1141 | unsigned ioc, | |
1142 | key_serial_t ringid) | |
1143 | { | |
1144 | struct iovec iovstack[UIO_FASTIOV], *iov = iovstack; | |
1145 | long ret; | |
1146 | ||
423b9788 | 1147 | if (!_payload_iov || !ioc) |
ee009e4a DH |
1148 | goto no_payload; |
1149 | ||
1150 | ret = rw_copy_check_uvector(WRITE, _payload_iov, ioc, | |
ac34ebb3 | 1151 | ARRAY_SIZE(iovstack), iovstack, &iov); |
ee009e4a | 1152 | if (ret < 0) |
a84a9219 | 1153 | goto err; |
ee009e4a DH |
1154 | if (ret == 0) |
1155 | goto no_payload_free; | |
1156 | ||
1157 | ret = keyctl_instantiate_key_common(id, iov, ioc, ret, ringid); | |
a84a9219 | 1158 | err: |
ee009e4a DH |
1159 | if (iov != iovstack) |
1160 | kfree(iov); | |
1161 | return ret; | |
1162 | ||
1163 | no_payload_free: | |
1164 | if (iov != iovstack) | |
1165 | kfree(iov); | |
1166 | no_payload: | |
1167 | return keyctl_instantiate_key_common(id, NULL, 0, 0, ringid); | |
1168 | } | |
1169 | ||
1da177e4 | 1170 | /* |
973c9f4f DH |
1171 | * Negatively instantiate the key with the given timeout (in seconds) and link |
1172 | * the key into the destination keyring if one is given. | |
1173 | * | |
1174 | * The caller must have the appropriate instantiation permit set for this to | |
1175 | * work (see keyctl_assume_authority). No other permissions are required. | |
1176 | * | |
1177 | * The key and any links to the key will be automatically garbage collected | |
1178 | * after the timeout expires. | |
1179 | * | |
1180 | * Negative keys are used to rate limit repeated request_key() calls by causing | |
1181 | * them to return -ENOKEY until the negative key expires. | |
1182 | * | |
1183 | * If successful, 0 will be returned. | |
1da177e4 LT |
1184 | */ |
1185 | long keyctl_negate_key(key_serial_t id, unsigned timeout, key_serial_t ringid) | |
fdd1b945 DH |
1186 | { |
1187 | return keyctl_reject_key(id, timeout, ENOKEY, ringid); | |
1188 | } | |
1189 | ||
1190 | /* | |
1191 | * Negatively instantiate the key with the given timeout (in seconds) and error | |
1192 | * code and link the key into the destination keyring if one is given. | |
1193 | * | |
1194 | * The caller must have the appropriate instantiation permit set for this to | |
1195 | * work (see keyctl_assume_authority). No other permissions are required. | |
1196 | * | |
1197 | * The key and any links to the key will be automatically garbage collected | |
1198 | * after the timeout expires. | |
1199 | * | |
1200 | * Negative keys are used to rate limit repeated request_key() calls by causing | |
1201 | * them to return the specified error code until the negative key expires. | |
1202 | * | |
1203 | * If successful, 0 will be returned. | |
1204 | */ | |
1205 | long keyctl_reject_key(key_serial_t id, unsigned timeout, unsigned error, | |
1206 | key_serial_t ringid) | |
1da177e4 | 1207 | { |
d84f4f99 | 1208 | const struct cred *cred = current_cred(); |
3e30148c | 1209 | struct request_key_auth *rka; |
8bbf4976 | 1210 | struct key *instkey, *dest_keyring; |
1da177e4 LT |
1211 | long ret; |
1212 | ||
fdd1b945 DH |
1213 | kenter("%d,%u,%u,%d", id, timeout, error, ringid); |
1214 | ||
1215 | /* must be a valid error code and mustn't be a kernel special */ | |
1216 | if (error <= 0 || | |
1217 | error >= MAX_ERRNO || | |
1218 | error == ERESTARTSYS || | |
1219 | error == ERESTARTNOINTR || | |
1220 | error == ERESTARTNOHAND || | |
1221 | error == ERESTART_RESTARTBLOCK) | |
1222 | return -EINVAL; | |
d84f4f99 | 1223 | |
b5f545c8 DH |
1224 | /* the appropriate instantiation authorisation key must have been |
1225 | * assumed before calling this */ | |
1226 | ret = -EPERM; | |
d84f4f99 | 1227 | instkey = cred->request_key_auth; |
b5f545c8 | 1228 | if (!instkey) |
1da177e4 | 1229 | goto error; |
1da177e4 | 1230 | |
3e30148c | 1231 | rka = instkey->payload.data; |
b5f545c8 DH |
1232 | if (rka->target_key->serial != id) |
1233 | goto error; | |
3e30148c | 1234 | |
1da177e4 LT |
1235 | /* find the destination keyring if present (which must also be |
1236 | * writable) */ | |
8bbf4976 DH |
1237 | ret = get_instantiation_keyring(ringid, rka, &dest_keyring); |
1238 | if (ret < 0) | |
1239 | goto error; | |
1da177e4 LT |
1240 | |
1241 | /* instantiate the key and link it into a keyring */ | |
fdd1b945 | 1242 | ret = key_reject_and_link(rka->target_key, timeout, error, |
8bbf4976 | 1243 | dest_keyring, instkey); |
1da177e4 | 1244 | |
8bbf4976 | 1245 | key_put(dest_keyring); |
b5f545c8 DH |
1246 | |
1247 | /* discard the assumed authority if it's just been disabled by | |
1248 | * instantiation of the key */ | |
d84f4f99 DH |
1249 | if (ret == 0) |
1250 | keyctl_change_reqkey_auth(NULL); | |
b5f545c8 DH |
1251 | |
1252 | error: | |
1da177e4 | 1253 | return ret; |
a8b17ed0 | 1254 | } |
1da177e4 | 1255 | |
3e30148c | 1256 | /* |
973c9f4f DH |
1257 | * Read or set the default keyring in which request_key() will cache keys and |
1258 | * return the old setting. | |
1259 | * | |
1260 | * If a process keyring is specified then this will be created if it doesn't | |
1261 | * yet exist. The old setting will be returned if successful. | |
3e30148c DH |
1262 | */ |
1263 | long keyctl_set_reqkey_keyring(int reqkey_defl) | |
1264 | { | |
d84f4f99 DH |
1265 | struct cred *new; |
1266 | int ret, old_setting; | |
1267 | ||
1268 | old_setting = current_cred_xxx(jit_keyring); | |
1269 | ||
1270 | if (reqkey_defl == KEY_REQKEY_DEFL_NO_CHANGE) | |
1271 | return old_setting; | |
1272 | ||
1273 | new = prepare_creds(); | |
1274 | if (!new) | |
1275 | return -ENOMEM; | |
3e30148c DH |
1276 | |
1277 | switch (reqkey_defl) { | |
1278 | case KEY_REQKEY_DEFL_THREAD_KEYRING: | |
d84f4f99 | 1279 | ret = install_thread_keyring_to_cred(new); |
3e30148c | 1280 | if (ret < 0) |
d84f4f99 | 1281 | goto error; |
3e30148c DH |
1282 | goto set; |
1283 | ||
1284 | case KEY_REQKEY_DEFL_PROCESS_KEYRING: | |
d84f4f99 DH |
1285 | ret = install_process_keyring_to_cred(new); |
1286 | if (ret < 0) { | |
1287 | if (ret != -EEXIST) | |
1288 | goto error; | |
1289 | ret = 0; | |
1290 | } | |
1291 | goto set; | |
3e30148c DH |
1292 | |
1293 | case KEY_REQKEY_DEFL_DEFAULT: | |
1294 | case KEY_REQKEY_DEFL_SESSION_KEYRING: | |
1295 | case KEY_REQKEY_DEFL_USER_KEYRING: | |
1296 | case KEY_REQKEY_DEFL_USER_SESSION_KEYRING: | |
d84f4f99 DH |
1297 | case KEY_REQKEY_DEFL_REQUESTOR_KEYRING: |
1298 | goto set; | |
3e30148c DH |
1299 | |
1300 | case KEY_REQKEY_DEFL_NO_CHANGE: | |
3e30148c DH |
1301 | case KEY_REQKEY_DEFL_GROUP_KEYRING: |
1302 | default: | |
d84f4f99 DH |
1303 | ret = -EINVAL; |
1304 | goto error; | |
3e30148c DH |
1305 | } |
1306 | ||
d84f4f99 DH |
1307 | set: |
1308 | new->jit_keyring = reqkey_defl; | |
1309 | commit_creds(new); | |
1310 | return old_setting; | |
1311 | error: | |
1312 | abort_creds(new); | |
4303ef19 | 1313 | return ret; |
a8b17ed0 | 1314 | } |
d84f4f99 | 1315 | |
017679c4 | 1316 | /* |
973c9f4f DH |
1317 | * Set or clear the timeout on a key. |
1318 | * | |
1319 | * Either the key must grant the caller Setattr permission or else the caller | |
1320 | * must hold an instantiation authorisation token for the key. | |
1321 | * | |
1322 | * The timeout is either 0 to clear the timeout, or a number of seconds from | |
1323 | * the current time. The key and any links to the key will be automatically | |
1324 | * garbage collected after the timeout expires. | |
1325 | * | |
1326 | * If successful, 0 is returned. | |
017679c4 DH |
1327 | */ |
1328 | long keyctl_set_timeout(key_serial_t id, unsigned timeout) | |
1329 | { | |
9156235b | 1330 | struct key *key, *instkey; |
017679c4 | 1331 | key_ref_t key_ref; |
017679c4 DH |
1332 | long ret; |
1333 | ||
5593122e | 1334 | key_ref = lookup_user_key(id, KEY_LOOKUP_CREATE | KEY_LOOKUP_PARTIAL, |
f5895943 | 1335 | KEY_NEED_SETATTR); |
017679c4 | 1336 | if (IS_ERR(key_ref)) { |
9156235b DH |
1337 | /* setting the timeout on a key under construction is permitted |
1338 | * if we have the authorisation token handy */ | |
1339 | if (PTR_ERR(key_ref) == -EACCES) { | |
1340 | instkey = key_get_instantiation_authkey(id); | |
1341 | if (!IS_ERR(instkey)) { | |
1342 | key_put(instkey); | |
1343 | key_ref = lookup_user_key(id, | |
1344 | KEY_LOOKUP_PARTIAL, | |
1345 | 0); | |
1346 | if (!IS_ERR(key_ref)) | |
1347 | goto okay; | |
1348 | } | |
1349 | } | |
1350 | ||
017679c4 DH |
1351 | ret = PTR_ERR(key_ref); |
1352 | goto error; | |
1353 | } | |
1354 | ||
9156235b | 1355 | okay: |
017679c4 | 1356 | key = key_ref_to_ptr(key_ref); |
59e6b9c1 | 1357 | key_set_timeout(key, timeout); |
017679c4 DH |
1358 | key_put(key); |
1359 | ||
1360 | ret = 0; | |
1361 | error: | |
1362 | return ret; | |
a8b17ed0 | 1363 | } |
017679c4 | 1364 | |
b5f545c8 | 1365 | /* |
973c9f4f DH |
1366 | * Assume (or clear) the authority to instantiate the specified key. |
1367 | * | |
1368 | * This sets the authoritative token currently in force for key instantiation. | |
1369 | * This must be done for a key to be instantiated. It has the effect of making | |
1370 | * available all the keys from the caller of the request_key() that created a | |
1371 | * key to request_key() calls made by the caller of this function. | |
1372 | * | |
1373 | * The caller must have the instantiation key in their process keyrings with a | |
1374 | * Search permission grant available to the caller. | |
1375 | * | |
1376 | * If the ID given is 0, then the setting will be cleared and 0 returned. | |
1377 | * | |
1378 | * If the ID given has a matching an authorisation key, then that key will be | |
1379 | * set and its ID will be returned. The authorisation key can be read to get | |
1380 | * the callout information passed to request_key(). | |
b5f545c8 DH |
1381 | */ |
1382 | long keyctl_assume_authority(key_serial_t id) | |
1383 | { | |
1384 | struct key *authkey; | |
1385 | long ret; | |
1386 | ||
1387 | /* special key IDs aren't permitted */ | |
1388 | ret = -EINVAL; | |
1389 | if (id < 0) | |
1390 | goto error; | |
1391 | ||
1392 | /* we divest ourselves of authority if given an ID of 0 */ | |
1393 | if (id == 0) { | |
d84f4f99 | 1394 | ret = keyctl_change_reqkey_auth(NULL); |
b5f545c8 DH |
1395 | goto error; |
1396 | } | |
1397 | ||
1398 | /* attempt to assume the authority temporarily granted to us whilst we | |
1399 | * instantiate the specified key | |
1400 | * - the authorisation key must be in the current task's keyrings | |
1401 | * somewhere | |
1402 | */ | |
1403 | authkey = key_get_instantiation_authkey(id); | |
1404 | if (IS_ERR(authkey)) { | |
1405 | ret = PTR_ERR(authkey); | |
1406 | goto error; | |
1407 | } | |
1408 | ||
d84f4f99 DH |
1409 | ret = keyctl_change_reqkey_auth(authkey); |
1410 | if (ret < 0) | |
1411 | goto error; | |
1412 | key_put(authkey); | |
b5f545c8 | 1413 | |
d84f4f99 | 1414 | ret = authkey->serial; |
b5f545c8 DH |
1415 | error: |
1416 | return ret; | |
a8b17ed0 | 1417 | } |
b5f545c8 | 1418 | |
70a5bb72 | 1419 | /* |
973c9f4f DH |
1420 | * Get a key's the LSM security label. |
1421 | * | |
1422 | * The key must grant the caller View permission for this to work. | |
1423 | * | |
1424 | * If there's a buffer, then up to buflen bytes of data will be placed into it. | |
1425 | * | |
1426 | * If successful, the amount of information available will be returned, | |
1427 | * irrespective of how much was copied (including the terminal NUL). | |
70a5bb72 DH |
1428 | */ |
1429 | long keyctl_get_security(key_serial_t keyid, | |
1430 | char __user *buffer, | |
1431 | size_t buflen) | |
1432 | { | |
1433 | struct key *key, *instkey; | |
1434 | key_ref_t key_ref; | |
1435 | char *context; | |
1436 | long ret; | |
1437 | ||
f5895943 | 1438 | key_ref = lookup_user_key(keyid, KEY_LOOKUP_PARTIAL, KEY_NEED_VIEW); |
70a5bb72 DH |
1439 | if (IS_ERR(key_ref)) { |
1440 | if (PTR_ERR(key_ref) != -EACCES) | |
1441 | return PTR_ERR(key_ref); | |
1442 | ||
1443 | /* viewing a key under construction is also permitted if we | |
1444 | * have the authorisation token handy */ | |
1445 | instkey = key_get_instantiation_authkey(keyid); | |
1446 | if (IS_ERR(instkey)) | |
fa1cc7b5 | 1447 | return PTR_ERR(instkey); |
70a5bb72 DH |
1448 | key_put(instkey); |
1449 | ||
5593122e | 1450 | key_ref = lookup_user_key(keyid, KEY_LOOKUP_PARTIAL, 0); |
70a5bb72 DH |
1451 | if (IS_ERR(key_ref)) |
1452 | return PTR_ERR(key_ref); | |
1453 | } | |
1454 | ||
1455 | key = key_ref_to_ptr(key_ref); | |
1456 | ret = security_key_getsecurity(key, &context); | |
1457 | if (ret == 0) { | |
1458 | /* if no information was returned, give userspace an empty | |
1459 | * string */ | |
1460 | ret = 1; | |
1461 | if (buffer && buflen > 0 && | |
1462 | copy_to_user(buffer, "", 1) != 0) | |
1463 | ret = -EFAULT; | |
1464 | } else if (ret > 0) { | |
1465 | /* return as much data as there's room for */ | |
1466 | if (buffer && buflen > 0) { | |
1467 | if (buflen > ret) | |
1468 | buflen = ret; | |
1469 | ||
1470 | if (copy_to_user(buffer, context, buflen) != 0) | |
1471 | ret = -EFAULT; | |
1472 | } | |
1473 | ||
1474 | kfree(context); | |
1475 | } | |
1476 | ||
1477 | key_ref_put(key_ref); | |
1478 | return ret; | |
1479 | } | |
1480 | ||
ee18d64c | 1481 | /* |
973c9f4f DH |
1482 | * Attempt to install the calling process's session keyring on the process's |
1483 | * parent process. | |
1484 | * | |
1485 | * The keyring must exist and must grant the caller LINK permission, and the | |
1486 | * parent process must be single-threaded and must have the same effective | |
1487 | * ownership as this process and mustn't be SUID/SGID. | |
1488 | * | |
1489 | * The keyring will be emplaced on the parent when it next resumes userspace. | |
1490 | * | |
1491 | * If successful, 0 will be returned. | |
ee18d64c DH |
1492 | */ |
1493 | long keyctl_session_to_parent(void) | |
1494 | { | |
1495 | struct task_struct *me, *parent; | |
1496 | const struct cred *mycred, *pcred; | |
67d12145 | 1497 | struct callback_head *newwork, *oldwork; |
ee18d64c | 1498 | key_ref_t keyring_r; |
413cd3d9 | 1499 | struct cred *cred; |
ee18d64c DH |
1500 | int ret; |
1501 | ||
f5895943 | 1502 | keyring_r = lookup_user_key(KEY_SPEC_SESSION_KEYRING, 0, KEY_NEED_LINK); |
ee18d64c DH |
1503 | if (IS_ERR(keyring_r)) |
1504 | return PTR_ERR(keyring_r); | |
1505 | ||
413cd3d9 | 1506 | ret = -ENOMEM; |
413cd3d9 | 1507 | |
ee18d64c DH |
1508 | /* our parent is going to need a new cred struct, a new tgcred struct |
1509 | * and new security data, so we allocate them here to prevent ENOMEM in | |
1510 | * our parent */ | |
ee18d64c DH |
1511 | cred = cred_alloc_blank(); |
1512 | if (!cred) | |
67d12145 AV |
1513 | goto error_keyring; |
1514 | newwork = &cred->rcu; | |
ee18d64c | 1515 | |
3a50597d DH |
1516 | cred->session_keyring = key_ref_to_ptr(keyring_r); |
1517 | keyring_r = NULL; | |
67d12145 | 1518 | init_task_work(newwork, key_change_session_keyring); |
ee18d64c DH |
1519 | |
1520 | me = current; | |
9d1ac65a | 1521 | rcu_read_lock(); |
ee18d64c DH |
1522 | write_lock_irq(&tasklist_lock); |
1523 | ||
ee18d64c | 1524 | ret = -EPERM; |
413cd3d9 ON |
1525 | oldwork = NULL; |
1526 | parent = me->real_parent; | |
ee18d64c DH |
1527 | |
1528 | /* the parent mustn't be init and mustn't be a kernel thread */ | |
1529 | if (parent->pid <= 1 || !parent->mm) | |
413cd3d9 | 1530 | goto unlock; |
ee18d64c DH |
1531 | |
1532 | /* the parent must be single threaded */ | |
dd98acf7 | 1533 | if (!thread_group_empty(parent)) |
413cd3d9 | 1534 | goto unlock; |
ee18d64c DH |
1535 | |
1536 | /* the parent and the child must have different session keyrings or | |
1537 | * there's no point */ | |
1538 | mycred = current_cred(); | |
1539 | pcred = __task_cred(parent); | |
1540 | if (mycred == pcred || | |
3a50597d | 1541 | mycred->session_keyring == pcred->session_keyring) { |
413cd3d9 ON |
1542 | ret = 0; |
1543 | goto unlock; | |
1544 | } | |
ee18d64c DH |
1545 | |
1546 | /* the parent must have the same effective ownership and mustn't be | |
1547 | * SUID/SGID */ | |
9a56c2db EB |
1548 | if (!uid_eq(pcred->uid, mycred->euid) || |
1549 | !uid_eq(pcred->euid, mycred->euid) || | |
1550 | !uid_eq(pcred->suid, mycred->euid) || | |
1551 | !gid_eq(pcred->gid, mycred->egid) || | |
1552 | !gid_eq(pcred->egid, mycred->egid) || | |
1553 | !gid_eq(pcred->sgid, mycred->egid)) | |
413cd3d9 | 1554 | goto unlock; |
ee18d64c DH |
1555 | |
1556 | /* the keyrings must have the same UID */ | |
3a50597d | 1557 | if ((pcred->session_keyring && |
2a74dbb9 LT |
1558 | !uid_eq(pcred->session_keyring->uid, mycred->euid)) || |
1559 | !uid_eq(mycred->session_keyring->uid, mycred->euid)) | |
413cd3d9 | 1560 | goto unlock; |
ee18d64c | 1561 | |
413cd3d9 ON |
1562 | /* cancel an already pending keyring replacement */ |
1563 | oldwork = task_work_cancel(parent, key_change_session_keyring); | |
ee18d64c DH |
1564 | |
1565 | /* the replacement session keyring is applied just prior to userspace | |
1566 | * restarting */ | |
67d12145 | 1567 | ret = task_work_add(parent, newwork, true); |
413cd3d9 ON |
1568 | if (!ret) |
1569 | newwork = NULL; | |
1570 | unlock: | |
ee18d64c | 1571 | write_unlock_irq(&tasklist_lock); |
9d1ac65a | 1572 | rcu_read_unlock(); |
67d12145 AV |
1573 | if (oldwork) |
1574 | put_cred(container_of(oldwork, struct cred, rcu)); | |
1575 | if (newwork) | |
1576 | put_cred(cred); | |
ee18d64c DH |
1577 | return ret; |
1578 | ||
1579 | error_keyring: | |
1580 | key_ref_put(keyring_r); | |
1581 | return ret; | |
1582 | } | |
1583 | ||
1da177e4 | 1584 | /* |
973c9f4f | 1585 | * The key control system call |
1da177e4 | 1586 | */ |
938bb9f5 HC |
1587 | SYSCALL_DEFINE5(keyctl, int, option, unsigned long, arg2, unsigned long, arg3, |
1588 | unsigned long, arg4, unsigned long, arg5) | |
1da177e4 LT |
1589 | { |
1590 | switch (option) { | |
1591 | case KEYCTL_GET_KEYRING_ID: | |
1592 | return keyctl_get_keyring_ID((key_serial_t) arg2, | |
1593 | (int) arg3); | |
1594 | ||
1595 | case KEYCTL_JOIN_SESSION_KEYRING: | |
1596 | return keyctl_join_session_keyring((const char __user *) arg2); | |
1597 | ||
1598 | case KEYCTL_UPDATE: | |
1599 | return keyctl_update_key((key_serial_t) arg2, | |
1600 | (const void __user *) arg3, | |
1601 | (size_t) arg4); | |
1602 | ||
1603 | case KEYCTL_REVOKE: | |
1604 | return keyctl_revoke_key((key_serial_t) arg2); | |
1605 | ||
1606 | case KEYCTL_DESCRIBE: | |
1607 | return keyctl_describe_key((key_serial_t) arg2, | |
1608 | (char __user *) arg3, | |
1609 | (unsigned) arg4); | |
1610 | ||
1611 | case KEYCTL_CLEAR: | |
1612 | return keyctl_keyring_clear((key_serial_t) arg2); | |
1613 | ||
1614 | case KEYCTL_LINK: | |
1615 | return keyctl_keyring_link((key_serial_t) arg2, | |
1616 | (key_serial_t) arg3); | |
1617 | ||
1618 | case KEYCTL_UNLINK: | |
1619 | return keyctl_keyring_unlink((key_serial_t) arg2, | |
1620 | (key_serial_t) arg3); | |
1621 | ||
1622 | case KEYCTL_SEARCH: | |
1623 | return keyctl_keyring_search((key_serial_t) arg2, | |
1624 | (const char __user *) arg3, | |
1625 | (const char __user *) arg4, | |
1626 | (key_serial_t) arg5); | |
1627 | ||
1628 | case KEYCTL_READ: | |
1629 | return keyctl_read_key((key_serial_t) arg2, | |
1630 | (char __user *) arg3, | |
1631 | (size_t) arg4); | |
1632 | ||
1633 | case KEYCTL_CHOWN: | |
1634 | return keyctl_chown_key((key_serial_t) arg2, | |
1635 | (uid_t) arg3, | |
1636 | (gid_t) arg4); | |
1637 | ||
1638 | case KEYCTL_SETPERM: | |
1639 | return keyctl_setperm_key((key_serial_t) arg2, | |
1640 | (key_perm_t) arg3); | |
1641 | ||
1642 | case KEYCTL_INSTANTIATE: | |
1643 | return keyctl_instantiate_key((key_serial_t) arg2, | |
1644 | (const void __user *) arg3, | |
1645 | (size_t) arg4, | |
1646 | (key_serial_t) arg5); | |
1647 | ||
1648 | case KEYCTL_NEGATE: | |
1649 | return keyctl_negate_key((key_serial_t) arg2, | |
1650 | (unsigned) arg3, | |
1651 | (key_serial_t) arg4); | |
1652 | ||
3e30148c DH |
1653 | case KEYCTL_SET_REQKEY_KEYRING: |
1654 | return keyctl_set_reqkey_keyring(arg2); | |
1655 | ||
017679c4 DH |
1656 | case KEYCTL_SET_TIMEOUT: |
1657 | return keyctl_set_timeout((key_serial_t) arg2, | |
1658 | (unsigned) arg3); | |
1659 | ||
b5f545c8 DH |
1660 | case KEYCTL_ASSUME_AUTHORITY: |
1661 | return keyctl_assume_authority((key_serial_t) arg2); | |
1662 | ||
70a5bb72 DH |
1663 | case KEYCTL_GET_SECURITY: |
1664 | return keyctl_get_security((key_serial_t) arg2, | |
90bd49ab | 1665 | (char __user *) arg3, |
70a5bb72 DH |
1666 | (size_t) arg4); |
1667 | ||
ee18d64c DH |
1668 | case KEYCTL_SESSION_TO_PARENT: |
1669 | return keyctl_session_to_parent(); | |
1670 | ||
fdd1b945 DH |
1671 | case KEYCTL_REJECT: |
1672 | return keyctl_reject_key((key_serial_t) arg2, | |
1673 | (unsigned) arg3, | |
1674 | (unsigned) arg4, | |
1675 | (key_serial_t) arg5); | |
1676 | ||
ee009e4a DH |
1677 | case KEYCTL_INSTANTIATE_IOV: |
1678 | return keyctl_instantiate_key_iov( | |
1679 | (key_serial_t) arg2, | |
1680 | (const struct iovec __user *) arg3, | |
1681 | (unsigned) arg4, | |
1682 | (key_serial_t) arg5); | |
1683 | ||
fd75815f DH |
1684 | case KEYCTL_INVALIDATE: |
1685 | return keyctl_invalidate_key((key_serial_t) arg2); | |
1686 | ||
f36f8c75 DH |
1687 | case KEYCTL_GET_PERSISTENT: |
1688 | return keyctl_get_persistent((uid_t)arg2, (key_serial_t)arg3); | |
1689 | ||
1da177e4 LT |
1690 | default: |
1691 | return -EOPNOTSUPP; | |
1692 | } | |
a8b17ed0 | 1693 | } |