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