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 | ||
aa9d4437 DH |
29 | #define KEY_MAX_DESC_SIZE 4096 |
30 | ||
0cb409d9 DA |
31 | static int key_get_type_from_user(char *type, |
32 | const char __user *_type, | |
33 | unsigned len) | |
34 | { | |
35 | int ret; | |
36 | ||
37 | ret = strncpy_from_user(type, _type, len); | |
0cb409d9 | 38 | if (ret < 0) |
4303ef19 | 39 | return ret; |
0cb409d9 DA |
40 | if (ret == 0 || ret >= len) |
41 | return -EINVAL; | |
54e2c2c1 DH |
42 | if (type[0] == '.') |
43 | return -EPERM; | |
0cb409d9 | 44 | type[len - 1] = '\0'; |
0cb409d9 DA |
45 | return 0; |
46 | } | |
47 | ||
1da177e4 | 48 | /* |
973c9f4f DH |
49 | * Extract the description of a new key from userspace and either add it as a |
50 | * new key to the specified keyring or update a matching key in that keyring. | |
51 | * | |
cf7f601c DH |
52 | * If the description is NULL or an empty string, the key type is asked to |
53 | * generate one from the payload. | |
54 | * | |
973c9f4f DH |
55 | * The keyring must be writable so that we can attach the key to it. |
56 | * | |
57 | * If successful, the new key's serial number is returned, otherwise an error | |
58 | * code is returned. | |
1da177e4 | 59 | */ |
1e7bfb21 HC |
60 | SYSCALL_DEFINE5(add_key, const char __user *, _type, |
61 | const char __user *, _description, | |
62 | const void __user *, _payload, | |
63 | size_t, plen, | |
64 | key_serial_t, ringid) | |
1da177e4 | 65 | { |
664cceb0 | 66 | key_ref_t keyring_ref, key_ref; |
1da177e4 LT |
67 | char type[32], *description; |
68 | void *payload; | |
0cb409d9 | 69 | long ret; |
1da177e4 LT |
70 | |
71 | ret = -EINVAL; | |
38bbca6b | 72 | if (plen > 1024 * 1024 - 1) |
1da177e4 LT |
73 | goto error; |
74 | ||
75 | /* draw all the data into kernel space */ | |
0cb409d9 | 76 | ret = key_get_type_from_user(type, _type, sizeof(type)); |
1da177e4 LT |
77 | if (ret < 0) |
78 | goto error; | |
1da177e4 | 79 | |
cf7f601c DH |
80 | description = NULL; |
81 | if (_description) { | |
aa9d4437 | 82 | description = strndup_user(_description, KEY_MAX_DESC_SIZE); |
cf7f601c DH |
83 | if (IS_ERR(description)) { |
84 | ret = PTR_ERR(description); | |
85 | goto error; | |
86 | } | |
87 | if (!*description) { | |
88 | kfree(description); | |
89 | description = NULL; | |
a4e3b8d7 MZ |
90 | } else if ((description[0] == '.') && |
91 | (strncmp(type, "keyring", 7) == 0)) { | |
92 | ret = -EPERM; | |
93 | goto error2; | |
cf7f601c | 94 | } |
0cb409d9 | 95 | } |
1da177e4 LT |
96 | |
97 | /* pull the payload in if one was supplied */ | |
98 | payload = NULL; | |
99 | ||
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; | |
38bbca6b DH |
106 | payload = vmalloc(plen); |
107 | if (!payload) | |
108 | goto error2; | |
109 | } | |
1da177e4 LT |
110 | |
111 | ret = -EFAULT; | |
112 | if (copy_from_user(payload, _payload, plen) != 0) | |
113 | goto error3; | |
114 | } | |
115 | ||
116 | /* find the target keyring (which must be writable) */ | |
f5895943 | 117 | keyring_ref = lookup_user_key(ringid, KEY_LOOKUP_CREATE, KEY_NEED_WRITE); |
664cceb0 DH |
118 | if (IS_ERR(keyring_ref)) { |
119 | ret = PTR_ERR(keyring_ref); | |
1da177e4 LT |
120 | goto error3; |
121 | } | |
122 | ||
123 | /* create or update the requested key and add it to the target | |
124 | * keyring */ | |
664cceb0 | 125 | key_ref = key_create_or_update(keyring_ref, type, description, |
6b79ccb5 AR |
126 | payload, plen, KEY_PERM_UNDEF, |
127 | KEY_ALLOC_IN_QUOTA); | |
664cceb0 DH |
128 | if (!IS_ERR(key_ref)) { |
129 | ret = key_ref_to_ptr(key_ref)->serial; | |
130 | key_ref_put(key_ref); | |
1da177e4 LT |
131 | } |
132 | else { | |
664cceb0 | 133 | ret = PTR_ERR(key_ref); |
1da177e4 LT |
134 | } |
135 | ||
664cceb0 | 136 | key_ref_put(keyring_ref); |
1da177e4 | 137 | error3: |
d0e0eba0 | 138 | kvfree(payload); |
1da177e4 LT |
139 | error2: |
140 | kfree(description); | |
141 | error: | |
142 | return ret; | |
a8b17ed0 | 143 | } |
1da177e4 | 144 | |
1da177e4 | 145 | /* |
973c9f4f DH |
146 | * Search the process keyrings and keyring trees linked from those for a |
147 | * matching key. Keyrings must have appropriate Search permission to be | |
148 | * searched. | |
149 | * | |
150 | * If a key is found, it will be attached to the destination keyring if there's | |
151 | * one specified and the serial number of the key will be returned. | |
152 | * | |
153 | * If no key is found, /sbin/request-key will be invoked if _callout_info is | |
154 | * non-NULL in an attempt to create a key. The _callout_info string will be | |
155 | * passed to /sbin/request-key to aid with completing the request. If the | |
156 | * _callout_info string is "" then it will be changed to "-". | |
1da177e4 | 157 | */ |
1e7bfb21 HC |
158 | SYSCALL_DEFINE4(request_key, const char __user *, _type, |
159 | const char __user *, _description, | |
160 | const char __user *, _callout_info, | |
161 | key_serial_t, destringid) | |
1da177e4 LT |
162 | { |
163 | struct key_type *ktype; | |
664cceb0 DH |
164 | struct key *key; |
165 | key_ref_t dest_ref; | |
4a38e122 | 166 | size_t callout_len; |
1da177e4 | 167 | char type[32], *description, *callout_info; |
0cb409d9 | 168 | long ret; |
1da177e4 LT |
169 | |
170 | /* pull the type into kernel space */ | |
0cb409d9 | 171 | ret = key_get_type_from_user(type, _type, sizeof(type)); |
1da177e4 LT |
172 | if (ret < 0) |
173 | goto error; | |
1260f801 | 174 | |
1da177e4 | 175 | /* pull the description into kernel space */ |
aa9d4437 | 176 | description = strndup_user(_description, KEY_MAX_DESC_SIZE); |
0cb409d9 DA |
177 | if (IS_ERR(description)) { |
178 | ret = PTR_ERR(description); | |
1da177e4 | 179 | goto error; |
0cb409d9 | 180 | } |
1da177e4 LT |
181 | |
182 | /* pull the callout info into kernel space */ | |
183 | callout_info = NULL; | |
4a38e122 | 184 | callout_len = 0; |
1da177e4 | 185 | if (_callout_info) { |
0cb409d9 DA |
186 | callout_info = strndup_user(_callout_info, PAGE_SIZE); |
187 | if (IS_ERR(callout_info)) { | |
188 | ret = PTR_ERR(callout_info); | |
1da177e4 | 189 | goto error2; |
0cb409d9 | 190 | } |
4a38e122 | 191 | callout_len = strlen(callout_info); |
1da177e4 LT |
192 | } |
193 | ||
194 | /* get the destination keyring if specified */ | |
664cceb0 | 195 | dest_ref = NULL; |
1da177e4 | 196 | if (destringid) { |
5593122e | 197 | dest_ref = lookup_user_key(destringid, KEY_LOOKUP_CREATE, |
f5895943 | 198 | KEY_NEED_WRITE); |
664cceb0 DH |
199 | if (IS_ERR(dest_ref)) { |
200 | ret = PTR_ERR(dest_ref); | |
1da177e4 LT |
201 | goto error3; |
202 | } | |
203 | } | |
204 | ||
205 | /* find the key type */ | |
206 | ktype = key_type_lookup(type); | |
207 | if (IS_ERR(ktype)) { | |
208 | ret = PTR_ERR(ktype); | |
209 | goto error4; | |
210 | } | |
211 | ||
212 | /* do the search */ | |
4a38e122 DH |
213 | key = request_key_and_link(ktype, description, callout_info, |
214 | callout_len, NULL, key_ref_to_ptr(dest_ref), | |
7e047ef5 | 215 | KEY_ALLOC_IN_QUOTA); |
1da177e4 LT |
216 | if (IS_ERR(key)) { |
217 | ret = PTR_ERR(key); | |
218 | goto error5; | |
219 | } | |
220 | ||
4aab1e89 DH |
221 | /* wait for the key to finish being constructed */ |
222 | ret = wait_for_key_construction(key, 1); | |
223 | if (ret < 0) | |
224 | goto error6; | |
225 | ||
1da177e4 LT |
226 | ret = key->serial; |
227 | ||
4aab1e89 | 228 | error6: |
3e30148c | 229 | key_put(key); |
c5b60b5e | 230 | error5: |
1da177e4 | 231 | key_type_put(ktype); |
c5b60b5e | 232 | error4: |
664cceb0 | 233 | key_ref_put(dest_ref); |
c5b60b5e | 234 | error3: |
1da177e4 | 235 | kfree(callout_info); |
c5b60b5e | 236 | error2: |
1da177e4 | 237 | kfree(description); |
c5b60b5e | 238 | error: |
1da177e4 | 239 | return ret; |
a8b17ed0 | 240 | } |
1da177e4 | 241 | |
1da177e4 | 242 | /* |
973c9f4f DH |
243 | * Get the ID of the specified process keyring. |
244 | * | |
245 | * The requested keyring must have search permission to be found. | |
246 | * | |
247 | * If successful, the ID of the requested keyring will be returned. | |
1da177e4 LT |
248 | */ |
249 | long keyctl_get_keyring_ID(key_serial_t id, int create) | |
250 | { | |
664cceb0 | 251 | key_ref_t key_ref; |
5593122e | 252 | unsigned long lflags; |
1da177e4 LT |
253 | long ret; |
254 | ||
5593122e | 255 | lflags = create ? KEY_LOOKUP_CREATE : 0; |
f5895943 | 256 | key_ref = lookup_user_key(id, lflags, KEY_NEED_SEARCH); |
664cceb0 DH |
257 | if (IS_ERR(key_ref)) { |
258 | ret = PTR_ERR(key_ref); | |
1da177e4 LT |
259 | goto error; |
260 | } | |
261 | ||
664cceb0 DH |
262 | ret = key_ref_to_ptr(key_ref)->serial; |
263 | key_ref_put(key_ref); | |
c5b60b5e | 264 | error: |
1da177e4 | 265 | return ret; |
973c9f4f | 266 | } |
1da177e4 | 267 | |
1da177e4 | 268 | /* |
973c9f4f DH |
269 | * Join a (named) session keyring. |
270 | * | |
271 | * Create and join an anonymous session keyring or join a named session | |
272 | * keyring, creating it if necessary. A named session keyring must have Search | |
273 | * permission for it to be joined. Session keyrings without this permit will | |
274 | * be skipped over. | |
275 | * | |
276 | * If successful, the ID of the joined session keyring will be returned. | |
1da177e4 LT |
277 | */ |
278 | long keyctl_join_session_keyring(const char __user *_name) | |
279 | { | |
280 | char *name; | |
0cb409d9 | 281 | long ret; |
1da177e4 LT |
282 | |
283 | /* fetch the name from userspace */ | |
284 | name = NULL; | |
285 | if (_name) { | |
aa9d4437 | 286 | name = strndup_user(_name, KEY_MAX_DESC_SIZE); |
0cb409d9 DA |
287 | if (IS_ERR(name)) { |
288 | ret = PTR_ERR(name); | |
1da177e4 | 289 | goto error; |
0cb409d9 | 290 | } |
1da177e4 LT |
291 | } |
292 | ||
293 | /* join the session */ | |
294 | ret = join_session_keyring(name); | |
0d54ee1c | 295 | kfree(name); |
1da177e4 | 296 | |
c5b60b5e | 297 | error: |
1da177e4 | 298 | return ret; |
a8b17ed0 | 299 | } |
1da177e4 | 300 | |
1da177e4 | 301 | /* |
973c9f4f DH |
302 | * Update a key's data payload from the given data. |
303 | * | |
304 | * The key must grant the caller Write permission and the key type must support | |
305 | * updating for this to work. A negative key can be positively instantiated | |
306 | * with this call. | |
307 | * | |
308 | * If successful, 0 will be returned. If the key type does not support | |
309 | * updating, then -EOPNOTSUPP will be returned. | |
1da177e4 LT |
310 | */ |
311 | long keyctl_update_key(key_serial_t id, | |
312 | const void __user *_payload, | |
313 | size_t plen) | |
314 | { | |
664cceb0 | 315 | key_ref_t key_ref; |
1da177e4 LT |
316 | void *payload; |
317 | long ret; | |
318 | ||
319 | ret = -EINVAL; | |
320 | if (plen > PAGE_SIZE) | |
321 | goto error; | |
322 | ||
323 | /* pull the payload in if one was supplied */ | |
324 | payload = NULL; | |
325 | if (_payload) { | |
326 | ret = -ENOMEM; | |
327 | payload = kmalloc(plen, GFP_KERNEL); | |
328 | if (!payload) | |
329 | goto error; | |
330 | ||
331 | ret = -EFAULT; | |
332 | if (copy_from_user(payload, _payload, plen) != 0) | |
333 | goto error2; | |
334 | } | |
335 | ||
336 | /* find the target key (which must be writable) */ | |
f5895943 | 337 | key_ref = lookup_user_key(id, 0, KEY_NEED_WRITE); |
664cceb0 DH |
338 | if (IS_ERR(key_ref)) { |
339 | ret = PTR_ERR(key_ref); | |
1da177e4 LT |
340 | goto error2; |
341 | } | |
342 | ||
343 | /* update the key */ | |
664cceb0 | 344 | ret = key_update(key_ref, payload, plen); |
1da177e4 | 345 | |
664cceb0 | 346 | key_ref_put(key_ref); |
c5b60b5e | 347 | error2: |
1da177e4 | 348 | kfree(payload); |
c5b60b5e | 349 | error: |
1da177e4 | 350 | return ret; |
a8b17ed0 | 351 | } |
1da177e4 | 352 | |
1da177e4 | 353 | /* |
973c9f4f DH |
354 | * Revoke a key. |
355 | * | |
356 | * The key must be grant the caller Write or Setattr permission for this to | |
357 | * work. The key type should give up its quota claim when revoked. The key | |
358 | * and any links to the key will be automatically garbage collected after a | |
359 | * certain amount of time (/proc/sys/kernel/keys/gc_delay). | |
360 | * | |
d3600bcf MZ |
361 | * Keys with KEY_FLAG_KEEP set should not be revoked. |
362 | * | |
973c9f4f | 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; |
d3600bcf | 368 | struct key *key; |
1da177e4 LT |
369 | long ret; |
370 | ||
f5895943 | 371 | key_ref = lookup_user_key(id, 0, KEY_NEED_WRITE); |
664cceb0 DH |
372 | if (IS_ERR(key_ref)) { |
373 | ret = PTR_ERR(key_ref); | |
0c2c9a3f DH |
374 | if (ret != -EACCES) |
375 | goto error; | |
f5895943 | 376 | key_ref = lookup_user_key(id, 0, KEY_NEED_SETATTR); |
0c2c9a3f DH |
377 | if (IS_ERR(key_ref)) { |
378 | ret = PTR_ERR(key_ref); | |
379 | goto error; | |
380 | } | |
1da177e4 LT |
381 | } |
382 | ||
d3600bcf | 383 | key = key_ref_to_ptr(key_ref); |
1da177e4 | 384 | ret = 0; |
d3600bcf | 385 | if (test_bit(KEY_FLAG_KEEP, &key->flags)) |
1d6d167c MZ |
386 | ret = -EPERM; |
387 | else | |
d3600bcf | 388 | key_revoke(key); |
1da177e4 | 389 | |
664cceb0 | 390 | key_ref_put(key_ref); |
c5b60b5e | 391 | error: |
1260f801 | 392 | return ret; |
a8b17ed0 | 393 | } |
1da177e4 | 394 | |
fd75815f DH |
395 | /* |
396 | * Invalidate a key. | |
397 | * | |
398 | * The key must be grant the caller Invalidate permission for this to work. | |
399 | * The key and any links to the key will be automatically garbage collected | |
400 | * immediately. | |
401 | * | |
d3600bcf MZ |
402 | * Keys with KEY_FLAG_KEEP set should not be invalidated. |
403 | * | |
fd75815f DH |
404 | * If successful, 0 is returned. |
405 | */ | |
406 | long keyctl_invalidate_key(key_serial_t id) | |
407 | { | |
408 | key_ref_t key_ref; | |
d3600bcf | 409 | struct key *key; |
fd75815f DH |
410 | long ret; |
411 | ||
412 | kenter("%d", id); | |
413 | ||
f5895943 | 414 | key_ref = lookup_user_key(id, 0, KEY_NEED_SEARCH); |
fd75815f DH |
415 | if (IS_ERR(key_ref)) { |
416 | ret = PTR_ERR(key_ref); | |
0c7774ab DH |
417 | |
418 | /* Root is permitted to invalidate certain special keys */ | |
419 | if (capable(CAP_SYS_ADMIN)) { | |
420 | key_ref = lookup_user_key(id, 0, 0); | |
421 | if (IS_ERR(key_ref)) | |
422 | goto error; | |
423 | if (test_bit(KEY_FLAG_ROOT_CAN_INVAL, | |
424 | &key_ref_to_ptr(key_ref)->flags)) | |
425 | goto invalidate; | |
426 | goto error_put; | |
427 | } | |
428 | ||
fd75815f DH |
429 | goto error; |
430 | } | |
431 | ||
0c7774ab | 432 | invalidate: |
d3600bcf | 433 | key = key_ref_to_ptr(key_ref); |
fd75815f | 434 | ret = 0; |
d3600bcf MZ |
435 | if (test_bit(KEY_FLAG_KEEP, &key->flags)) |
436 | ret = -EPERM; | |
1d6d167c | 437 | else |
d3600bcf | 438 | key_invalidate(key); |
0c7774ab | 439 | error_put: |
fd75815f DH |
440 | key_ref_put(key_ref); |
441 | error: | |
442 | kleave(" = %ld", ret); | |
443 | return ret; | |
444 | } | |
445 | ||
1da177e4 | 446 | /* |
973c9f4f DH |
447 | * Clear the specified keyring, creating an empty process keyring if one of the |
448 | * special keyring IDs is used. | |
449 | * | |
d3600bcf MZ |
450 | * The keyring must grant the caller Write permission and not have |
451 | * KEY_FLAG_KEEP set for this to work. If successful, 0 will be returned. | |
1da177e4 LT |
452 | */ |
453 | long keyctl_keyring_clear(key_serial_t ringid) | |
454 | { | |
664cceb0 | 455 | key_ref_t keyring_ref; |
d3600bcf | 456 | struct key *keyring; |
1da177e4 LT |
457 | long ret; |
458 | ||
f5895943 | 459 | keyring_ref = lookup_user_key(ringid, KEY_LOOKUP_CREATE, KEY_NEED_WRITE); |
664cceb0 DH |
460 | if (IS_ERR(keyring_ref)) { |
461 | ret = PTR_ERR(keyring_ref); | |
700920eb DH |
462 | |
463 | /* Root is permitted to invalidate certain special keyrings */ | |
464 | if (capable(CAP_SYS_ADMIN)) { | |
465 | keyring_ref = lookup_user_key(ringid, 0, 0); | |
466 | if (IS_ERR(keyring_ref)) | |
467 | goto error; | |
468 | if (test_bit(KEY_FLAG_ROOT_CAN_CLEAR, | |
469 | &key_ref_to_ptr(keyring_ref)->flags)) | |
470 | goto clear; | |
471 | goto error_put; | |
472 | } | |
473 | ||
1da177e4 LT |
474 | goto error; |
475 | } | |
476 | ||
700920eb | 477 | clear: |
d3600bcf MZ |
478 | keyring = key_ref_to_ptr(keyring_ref); |
479 | if (test_bit(KEY_FLAG_KEEP, &keyring->flags)) | |
480 | ret = -EPERM; | |
481 | else | |
482 | ret = keyring_clear(keyring); | |
700920eb | 483 | error_put: |
664cceb0 | 484 | key_ref_put(keyring_ref); |
c5b60b5e | 485 | error: |
1da177e4 | 486 | return ret; |
a8b17ed0 | 487 | } |
1da177e4 | 488 | |
1da177e4 | 489 | /* |
973c9f4f DH |
490 | * Create a link from a keyring to a key if there's no matching key in the |
491 | * keyring, otherwise replace the link to the matching key with a link to the | |
492 | * new key. | |
493 | * | |
494 | * The key must grant the caller Link permission and the the keyring must grant | |
495 | * the caller Write permission. Furthermore, if an additional link is created, | |
496 | * the keyring's quota will be extended. | |
497 | * | |
498 | * If successful, 0 will be returned. | |
1da177e4 LT |
499 | */ |
500 | long keyctl_keyring_link(key_serial_t id, key_serial_t ringid) | |
501 | { | |
664cceb0 | 502 | key_ref_t keyring_ref, key_ref; |
1da177e4 LT |
503 | long ret; |
504 | ||
f5895943 | 505 | keyring_ref = lookup_user_key(ringid, KEY_LOOKUP_CREATE, KEY_NEED_WRITE); |
664cceb0 DH |
506 | if (IS_ERR(keyring_ref)) { |
507 | ret = PTR_ERR(keyring_ref); | |
1da177e4 LT |
508 | goto error; |
509 | } | |
510 | ||
f5895943 | 511 | key_ref = lookup_user_key(id, KEY_LOOKUP_CREATE, KEY_NEED_LINK); |
664cceb0 DH |
512 | if (IS_ERR(key_ref)) { |
513 | ret = PTR_ERR(key_ref); | |
1da177e4 LT |
514 | goto error2; |
515 | } | |
516 | ||
664cceb0 | 517 | ret = key_link(key_ref_to_ptr(keyring_ref), key_ref_to_ptr(key_ref)); |
1da177e4 | 518 | |
664cceb0 | 519 | key_ref_put(key_ref); |
c5b60b5e | 520 | error2: |
664cceb0 | 521 | key_ref_put(keyring_ref); |
c5b60b5e | 522 | error: |
1da177e4 | 523 | return ret; |
a8b17ed0 | 524 | } |
1da177e4 | 525 | |
1da177e4 | 526 | /* |
973c9f4f DH |
527 | * Unlink a key from a keyring. |
528 | * | |
529 | * The keyring must grant the caller Write permission for this to work; the key | |
530 | * itself need not grant the caller anything. If the last link to a key is | |
531 | * removed then that key will be scheduled for destruction. | |
532 | * | |
d3600bcf MZ |
533 | * Keys or keyrings with KEY_FLAG_KEEP set should not be unlinked. |
534 | * | |
973c9f4f | 535 | * If successful, 0 will be returned. |
1da177e4 LT |
536 | */ |
537 | long keyctl_keyring_unlink(key_serial_t id, key_serial_t ringid) | |
538 | { | |
664cceb0 | 539 | key_ref_t keyring_ref, key_ref; |
d3600bcf | 540 | struct key *keyring, *key; |
1da177e4 LT |
541 | long ret; |
542 | ||
f5895943 | 543 | keyring_ref = lookup_user_key(ringid, 0, KEY_NEED_WRITE); |
664cceb0 DH |
544 | if (IS_ERR(keyring_ref)) { |
545 | ret = PTR_ERR(keyring_ref); | |
1da177e4 LT |
546 | goto error; |
547 | } | |
548 | ||
5593122e | 549 | key_ref = lookup_user_key(id, KEY_LOOKUP_FOR_UNLINK, 0); |
664cceb0 DH |
550 | if (IS_ERR(key_ref)) { |
551 | ret = PTR_ERR(key_ref); | |
1da177e4 LT |
552 | goto error2; |
553 | } | |
554 | ||
d3600bcf MZ |
555 | keyring = key_ref_to_ptr(keyring_ref); |
556 | key = key_ref_to_ptr(key_ref); | |
557 | if (test_bit(KEY_FLAG_KEEP, &keyring->flags) && | |
558 | test_bit(KEY_FLAG_KEEP, &key->flags)) | |
559 | ret = -EPERM; | |
560 | else | |
561 | ret = key_unlink(keyring, key); | |
1da177e4 | 562 | |
664cceb0 | 563 | key_ref_put(key_ref); |
c5b60b5e | 564 | error2: |
664cceb0 | 565 | key_ref_put(keyring_ref); |
c5b60b5e | 566 | error: |
1da177e4 | 567 | return ret; |
a8b17ed0 | 568 | } |
1da177e4 | 569 | |
1da177e4 | 570 | /* |
973c9f4f DH |
571 | * Return a description of a key to userspace. |
572 | * | |
573 | * The key must grant the caller View permission for this to work. | |
574 | * | |
575 | * If there's a buffer, we place up to buflen bytes of data into it formatted | |
576 | * in the following way: | |
577 | * | |
1da177e4 | 578 | * type;uid;gid;perm;description<NUL> |
973c9f4f DH |
579 | * |
580 | * If successful, we return the amount of description available, irrespective | |
581 | * of how much we may have copied into the buffer. | |
1da177e4 LT |
582 | */ |
583 | long keyctl_describe_key(key_serial_t keyid, | |
584 | char __user *buffer, | |
585 | size_t buflen) | |
586 | { | |
3e30148c | 587 | struct key *key, *instkey; |
664cceb0 | 588 | key_ref_t key_ref; |
aa9d4437 | 589 | char *infobuf; |
1da177e4 | 590 | long ret; |
aa9d4437 | 591 | int desclen, infolen; |
1da177e4 | 592 | |
f5895943 | 593 | key_ref = lookup_user_key(keyid, KEY_LOOKUP_PARTIAL, KEY_NEED_VIEW); |
664cceb0 | 594 | if (IS_ERR(key_ref)) { |
3e30148c DH |
595 | /* viewing a key under construction is permitted if we have the |
596 | * authorisation token handy */ | |
664cceb0 | 597 | if (PTR_ERR(key_ref) == -EACCES) { |
3e30148c DH |
598 | instkey = key_get_instantiation_authkey(keyid); |
599 | if (!IS_ERR(instkey)) { | |
600 | key_put(instkey); | |
8bbf4976 | 601 | key_ref = lookup_user_key(keyid, |
5593122e DH |
602 | KEY_LOOKUP_PARTIAL, |
603 | 0); | |
664cceb0 | 604 | if (!IS_ERR(key_ref)) |
3e30148c DH |
605 | goto okay; |
606 | } | |
607 | } | |
608 | ||
664cceb0 | 609 | ret = PTR_ERR(key_ref); |
1da177e4 LT |
610 | goto error; |
611 | } | |
612 | ||
3e30148c | 613 | okay: |
664cceb0 | 614 | key = key_ref_to_ptr(key_ref); |
aa9d4437 | 615 | desclen = strlen(key->description); |
664cceb0 | 616 | |
aa9d4437 DH |
617 | /* calculate how much information we're going to return */ |
618 | ret = -ENOMEM; | |
619 | infobuf = kasprintf(GFP_KERNEL, | |
620 | "%s;%d;%d;%08x;", | |
621 | key->type->name, | |
622 | from_kuid_munged(current_user_ns(), key->uid), | |
623 | from_kgid_munged(current_user_ns(), key->gid), | |
624 | key->perm); | |
625 | if (!infobuf) | |
626 | goto error2; | |
627 | infolen = strlen(infobuf); | |
628 | ret = infolen + desclen + 1; | |
1da177e4 LT |
629 | |
630 | /* consider returning the data */ | |
aa9d4437 DH |
631 | if (buffer && buflen >= ret) { |
632 | if (copy_to_user(buffer, infobuf, infolen) != 0 || | |
633 | copy_to_user(buffer + infolen, key->description, | |
634 | desclen + 1) != 0) | |
1da177e4 LT |
635 | ret = -EFAULT; |
636 | } | |
637 | ||
aa9d4437 | 638 | kfree(infobuf); |
c5b60b5e | 639 | error2: |
664cceb0 | 640 | key_ref_put(key_ref); |
c5b60b5e | 641 | error: |
1da177e4 | 642 | return ret; |
a8b17ed0 | 643 | } |
1da177e4 | 644 | |
1da177e4 | 645 | /* |
973c9f4f DH |
646 | * Search the specified keyring and any keyrings it links to for a matching |
647 | * key. Only keyrings that grant the caller Search permission will be searched | |
648 | * (this includes the starting keyring). Only keys with Search permission can | |
649 | * be found. | |
650 | * | |
651 | * If successful, the found key will be linked to the destination keyring if | |
652 | * supplied and the key has Link permission, and the found key ID will be | |
653 | * returned. | |
1da177e4 LT |
654 | */ |
655 | long keyctl_keyring_search(key_serial_t ringid, | |
656 | const char __user *_type, | |
657 | const char __user *_description, | |
658 | key_serial_t destringid) | |
659 | { | |
660 | struct key_type *ktype; | |
664cceb0 | 661 | key_ref_t keyring_ref, key_ref, dest_ref; |
1da177e4 | 662 | char type[32], *description; |
0cb409d9 | 663 | long ret; |
1da177e4 LT |
664 | |
665 | /* pull the type and description into kernel space */ | |
0cb409d9 | 666 | ret = key_get_type_from_user(type, _type, sizeof(type)); |
1da177e4 LT |
667 | if (ret < 0) |
668 | goto error; | |
1da177e4 | 669 | |
aa9d4437 | 670 | description = strndup_user(_description, KEY_MAX_DESC_SIZE); |
0cb409d9 DA |
671 | if (IS_ERR(description)) { |
672 | ret = PTR_ERR(description); | |
1da177e4 | 673 | goto error; |
0cb409d9 | 674 | } |
1da177e4 LT |
675 | |
676 | /* get the keyring at which to begin the search */ | |
f5895943 | 677 | keyring_ref = lookup_user_key(ringid, 0, KEY_NEED_SEARCH); |
664cceb0 DH |
678 | if (IS_ERR(keyring_ref)) { |
679 | ret = PTR_ERR(keyring_ref); | |
1da177e4 LT |
680 | goto error2; |
681 | } | |
682 | ||
683 | /* get the destination keyring if specified */ | |
664cceb0 | 684 | dest_ref = NULL; |
1da177e4 | 685 | if (destringid) { |
5593122e | 686 | dest_ref = lookup_user_key(destringid, KEY_LOOKUP_CREATE, |
f5895943 | 687 | KEY_NEED_WRITE); |
664cceb0 DH |
688 | if (IS_ERR(dest_ref)) { |
689 | ret = PTR_ERR(dest_ref); | |
1da177e4 LT |
690 | goto error3; |
691 | } | |
692 | } | |
693 | ||
694 | /* find the key type */ | |
695 | ktype = key_type_lookup(type); | |
696 | if (IS_ERR(ktype)) { | |
697 | ret = PTR_ERR(ktype); | |
698 | goto error4; | |
699 | } | |
700 | ||
701 | /* do the search */ | |
664cceb0 DH |
702 | key_ref = keyring_search(keyring_ref, ktype, description); |
703 | if (IS_ERR(key_ref)) { | |
704 | ret = PTR_ERR(key_ref); | |
1da177e4 LT |
705 | |
706 | /* treat lack or presence of a negative key the same */ | |
707 | if (ret == -EAGAIN) | |
708 | ret = -ENOKEY; | |
709 | goto error5; | |
710 | } | |
711 | ||
712 | /* link the resulting key to the destination keyring if we can */ | |
664cceb0 | 713 | if (dest_ref) { |
f5895943 | 714 | ret = key_permission(key_ref, KEY_NEED_LINK); |
29db9190 | 715 | if (ret < 0) |
1da177e4 LT |
716 | goto error6; |
717 | ||
664cceb0 | 718 | ret = key_link(key_ref_to_ptr(dest_ref), key_ref_to_ptr(key_ref)); |
1da177e4 LT |
719 | if (ret < 0) |
720 | goto error6; | |
721 | } | |
722 | ||
664cceb0 | 723 | ret = key_ref_to_ptr(key_ref)->serial; |
1da177e4 | 724 | |
c5b60b5e | 725 | error6: |
664cceb0 | 726 | key_ref_put(key_ref); |
c5b60b5e | 727 | error5: |
1da177e4 | 728 | key_type_put(ktype); |
c5b60b5e | 729 | error4: |
664cceb0 | 730 | key_ref_put(dest_ref); |
c5b60b5e | 731 | error3: |
664cceb0 | 732 | key_ref_put(keyring_ref); |
c5b60b5e | 733 | error2: |
1da177e4 | 734 | kfree(description); |
c5b60b5e | 735 | error: |
1da177e4 | 736 | return ret; |
a8b17ed0 | 737 | } |
1da177e4 | 738 | |
1da177e4 | 739 | /* |
973c9f4f DH |
740 | * Read a key's payload. |
741 | * | |
742 | * The key must either grant the caller Read permission, or it must grant the | |
743 | * caller Search permission when searched for from the process keyrings. | |
744 | * | |
745 | * If successful, we place up to buflen bytes of data into the buffer, if one | |
746 | * is provided, and return the amount of data that is available in the key, | |
747 | * irrespective of how much we copied into the buffer. | |
1da177e4 LT |
748 | */ |
749 | long keyctl_read_key(key_serial_t keyid, char __user *buffer, size_t buflen) | |
750 | { | |
664cceb0 DH |
751 | struct key *key; |
752 | key_ref_t key_ref; | |
1da177e4 LT |
753 | long ret; |
754 | ||
755 | /* find the key first */ | |
5593122e | 756 | key_ref = lookup_user_key(keyid, 0, 0); |
664cceb0 DH |
757 | if (IS_ERR(key_ref)) { |
758 | ret = -ENOKEY; | |
759 | goto error; | |
1da177e4 LT |
760 | } |
761 | ||
664cceb0 DH |
762 | key = key_ref_to_ptr(key_ref); |
763 | ||
764 | /* see if we can read it directly */ | |
f5895943 | 765 | ret = key_permission(key_ref, KEY_NEED_READ); |
29db9190 | 766 | if (ret == 0) |
664cceb0 | 767 | goto can_read_key; |
29db9190 DH |
768 | if (ret != -EACCES) |
769 | goto error; | |
664cceb0 DH |
770 | |
771 | /* we can't; see if it's searchable from this process's keyrings | |
772 | * - we automatically take account of the fact that it may be | |
773 | * dangling off an instantiation key | |
774 | */ | |
775 | if (!is_key_possessed(key_ref)) { | |
776 | ret = -EACCES; | |
777 | goto error2; | |
778 | } | |
1da177e4 LT |
779 | |
780 | /* the key is probably readable - now try to read it */ | |
c5b60b5e | 781 | can_read_key: |
b4a1b4f5 DH |
782 | ret = -EOPNOTSUPP; |
783 | if (key->type->read) { | |
784 | /* Read the data with the semaphore held (since we might sleep) | |
785 | * to protect against the key being updated or revoked. | |
786 | */ | |
787 | down_read(&key->sem); | |
788 | ret = key_validate(key); | |
789 | if (ret == 0) | |
1da177e4 | 790 | ret = key->type->read(key, buffer, buflen); |
b4a1b4f5 | 791 | up_read(&key->sem); |
1da177e4 LT |
792 | } |
793 | ||
c5b60b5e | 794 | error2: |
1da177e4 | 795 | key_put(key); |
c5b60b5e | 796 | error: |
1da177e4 | 797 | return ret; |
a8b17ed0 | 798 | } |
1da177e4 | 799 | |
1da177e4 | 800 | /* |
973c9f4f DH |
801 | * Change the ownership of a key |
802 | * | |
803 | * The key must grant the caller Setattr permission for this to work, though | |
804 | * the key need not be fully instantiated yet. For the UID to be changed, or | |
805 | * for the GID to be changed to a group the caller is not a member of, the | |
806 | * caller must have sysadmin capability. If either uid or gid is -1 then that | |
807 | * attribute is not changed. | |
808 | * | |
809 | * If the UID is to be changed, the new user must have sufficient quota to | |
810 | * accept the key. The quota deduction will be removed from the old user to | |
811 | * the new user should the attribute be changed. | |
812 | * | |
813 | * If successful, 0 will be returned. | |
1da177e4 | 814 | */ |
9a56c2db | 815 | long keyctl_chown_key(key_serial_t id, uid_t user, gid_t group) |
1da177e4 | 816 | { |
5801649d | 817 | struct key_user *newowner, *zapowner = NULL; |
1da177e4 | 818 | struct key *key; |
664cceb0 | 819 | key_ref_t key_ref; |
1da177e4 | 820 | long ret; |
9a56c2db EB |
821 | kuid_t uid; |
822 | kgid_t gid; | |
823 | ||
824 | uid = make_kuid(current_user_ns(), user); | |
825 | gid = make_kgid(current_user_ns(), group); | |
826 | ret = -EINVAL; | |
827 | if ((user != (uid_t) -1) && !uid_valid(uid)) | |
828 | goto error; | |
829 | if ((group != (gid_t) -1) && !gid_valid(gid)) | |
830 | goto error; | |
1da177e4 LT |
831 | |
832 | ret = 0; | |
9a56c2db | 833 | if (user == (uid_t) -1 && group == (gid_t) -1) |
1da177e4 LT |
834 | goto error; |
835 | ||
5593122e | 836 | key_ref = lookup_user_key(id, KEY_LOOKUP_CREATE | KEY_LOOKUP_PARTIAL, |
f5895943 | 837 | KEY_NEED_SETATTR); |
664cceb0 DH |
838 | if (IS_ERR(key_ref)) { |
839 | ret = PTR_ERR(key_ref); | |
1da177e4 LT |
840 | goto error; |
841 | } | |
842 | ||
664cceb0 DH |
843 | key = key_ref_to_ptr(key_ref); |
844 | ||
1da177e4 LT |
845 | /* make the changes with the locks held to prevent chown/chown races */ |
846 | ret = -EACCES; | |
847 | down_write(&key->sem); | |
1da177e4 LT |
848 | |
849 | if (!capable(CAP_SYS_ADMIN)) { | |
850 | /* only the sysadmin can chown a key to some other UID */ | |
9a56c2db | 851 | if (user != (uid_t) -1 && !uid_eq(key->uid, uid)) |
5801649d | 852 | goto error_put; |
1da177e4 LT |
853 | |
854 | /* only the sysadmin can set the key's GID to a group other | |
855 | * than one of those that the current process subscribes to */ | |
9a56c2db | 856 | if (group != (gid_t) -1 && !gid_eq(gid, key->gid) && !in_group_p(gid)) |
5801649d | 857 | goto error_put; |
1da177e4 LT |
858 | } |
859 | ||
5801649d | 860 | /* change the UID */ |
9a56c2db | 861 | if (user != (uid_t) -1 && !uid_eq(uid, key->uid)) { |
5801649d | 862 | ret = -ENOMEM; |
9a56c2db | 863 | newowner = key_user_lookup(uid); |
5801649d FT |
864 | if (!newowner) |
865 | goto error_put; | |
866 | ||
867 | /* transfer the quota burden to the new user */ | |
868 | if (test_bit(KEY_FLAG_IN_QUOTA, &key->flags)) { | |
9a56c2db | 869 | unsigned maxkeys = uid_eq(uid, GLOBAL_ROOT_UID) ? |
0b77f5bf | 870 | key_quota_root_maxkeys : key_quota_maxkeys; |
9a56c2db | 871 | unsigned maxbytes = uid_eq(uid, GLOBAL_ROOT_UID) ? |
0b77f5bf DH |
872 | key_quota_root_maxbytes : key_quota_maxbytes; |
873 | ||
5801649d | 874 | spin_lock(&newowner->lock); |
0b77f5bf DH |
875 | if (newowner->qnkeys + 1 >= maxkeys || |
876 | newowner->qnbytes + key->quotalen >= maxbytes || | |
877 | newowner->qnbytes + key->quotalen < | |
878 | newowner->qnbytes) | |
5801649d FT |
879 | goto quota_overrun; |
880 | ||
881 | newowner->qnkeys++; | |
882 | newowner->qnbytes += key->quotalen; | |
883 | spin_unlock(&newowner->lock); | |
884 | ||
885 | spin_lock(&key->user->lock); | |
886 | key->user->qnkeys--; | |
887 | key->user->qnbytes -= key->quotalen; | |
888 | spin_unlock(&key->user->lock); | |
889 | } | |
890 | ||
891 | atomic_dec(&key->user->nkeys); | |
892 | atomic_inc(&newowner->nkeys); | |
893 | ||
894 | if (test_bit(KEY_FLAG_INSTANTIATED, &key->flags)) { | |
895 | atomic_dec(&key->user->nikeys); | |
896 | atomic_inc(&newowner->nikeys); | |
897 | } | |
898 | ||
899 | zapowner = key->user; | |
900 | key->user = newowner; | |
901 | key->uid = uid; | |
1da177e4 LT |
902 | } |
903 | ||
904 | /* change the GID */ | |
9a56c2db | 905 | if (group != (gid_t) -1) |
1da177e4 LT |
906 | key->gid = gid; |
907 | ||
908 | ret = 0; | |
909 | ||
5801649d | 910 | error_put: |
1da177e4 LT |
911 | up_write(&key->sem); |
912 | key_put(key); | |
5801649d FT |
913 | if (zapowner) |
914 | key_user_put(zapowner); | |
915 | error: | |
1da177e4 LT |
916 | return ret; |
917 | ||
5801649d FT |
918 | quota_overrun: |
919 | spin_unlock(&newowner->lock); | |
920 | zapowner = newowner; | |
921 | ret = -EDQUOT; | |
922 | goto error_put; | |
a8b17ed0 | 923 | } |
5801649d | 924 | |
1da177e4 | 925 | /* |
973c9f4f DH |
926 | * Change the permission mask on a key. |
927 | * | |
928 | * The key must grant the caller Setattr permission for this to work, though | |
929 | * the key need not be fully instantiated yet. If the caller does not have | |
930 | * sysadmin capability, it may only change the permission on keys that it owns. | |
1da177e4 LT |
931 | */ |
932 | long keyctl_setperm_key(key_serial_t id, key_perm_t perm) | |
933 | { | |
934 | struct key *key; | |
664cceb0 | 935 | key_ref_t key_ref; |
1da177e4 LT |
936 | long ret; |
937 | ||
938 | ret = -EINVAL; | |
664cceb0 | 939 | if (perm & ~(KEY_POS_ALL | KEY_USR_ALL | KEY_GRP_ALL | KEY_OTH_ALL)) |
1da177e4 LT |
940 | goto error; |
941 | ||
5593122e | 942 | key_ref = lookup_user_key(id, KEY_LOOKUP_CREATE | KEY_LOOKUP_PARTIAL, |
f5895943 | 943 | KEY_NEED_SETATTR); |
664cceb0 DH |
944 | if (IS_ERR(key_ref)) { |
945 | ret = PTR_ERR(key_ref); | |
1da177e4 LT |
946 | goto error; |
947 | } | |
948 | ||
664cceb0 DH |
949 | key = key_ref_to_ptr(key_ref); |
950 | ||
76d8aeab | 951 | /* make the changes with the locks held to prevent chown/chmod races */ |
1da177e4 LT |
952 | ret = -EACCES; |
953 | down_write(&key->sem); | |
1da177e4 | 954 | |
76d8aeab | 955 | /* if we're not the sysadmin, we can only change a key that we own */ |
9a56c2db | 956 | if (capable(CAP_SYS_ADMIN) || uid_eq(key->uid, current_fsuid())) { |
76d8aeab DH |
957 | key->perm = perm; |
958 | ret = 0; | |
959 | } | |
1da177e4 | 960 | |
1da177e4 LT |
961 | up_write(&key->sem); |
962 | key_put(key); | |
76d8aeab | 963 | error: |
1da177e4 | 964 | return ret; |
a8b17ed0 | 965 | } |
1da177e4 | 966 | |
8bbf4976 | 967 | /* |
973c9f4f DH |
968 | * Get the destination keyring for instantiation and check that the caller has |
969 | * Write permission on it. | |
8bbf4976 DH |
970 | */ |
971 | static long get_instantiation_keyring(key_serial_t ringid, | |
972 | struct request_key_auth *rka, | |
973 | struct key **_dest_keyring) | |
974 | { | |
975 | key_ref_t dkref; | |
976 | ||
eca1bf5b DH |
977 | *_dest_keyring = NULL; |
978 | ||
8bbf4976 | 979 | /* just return a NULL pointer if we weren't asked to make a link */ |
eca1bf5b | 980 | if (ringid == 0) |
8bbf4976 | 981 | return 0; |
8bbf4976 DH |
982 | |
983 | /* if a specific keyring is nominated by ID, then use that */ | |
984 | if (ringid > 0) { | |
f5895943 | 985 | dkref = lookup_user_key(ringid, KEY_LOOKUP_CREATE, KEY_NEED_WRITE); |
8bbf4976 DH |
986 | if (IS_ERR(dkref)) |
987 | return PTR_ERR(dkref); | |
988 | *_dest_keyring = key_ref_to_ptr(dkref); | |
989 | return 0; | |
990 | } | |
991 | ||
992 | if (ringid == KEY_SPEC_REQKEY_AUTH_KEY) | |
993 | return -EINVAL; | |
994 | ||
995 | /* otherwise specify the destination keyring recorded in the | |
996 | * authorisation key (any KEY_SPEC_*_KEYRING) */ | |
997 | if (ringid >= KEY_SPEC_REQUESTOR_KEYRING) { | |
21279cfa | 998 | *_dest_keyring = key_get(rka->dest_keyring); |
8bbf4976 DH |
999 | return 0; |
1000 | } | |
1001 | ||
1002 | return -ENOKEY; | |
1003 | } | |
1004 | ||
d84f4f99 | 1005 | /* |
973c9f4f | 1006 | * Change the request_key authorisation key on the current process. |
d84f4f99 DH |
1007 | */ |
1008 | static int keyctl_change_reqkey_auth(struct key *key) | |
1009 | { | |
1010 | struct cred *new; | |
1011 | ||
1012 | new = prepare_creds(); | |
1013 | if (!new) | |
1014 | return -ENOMEM; | |
1015 | ||
1016 | key_put(new->request_key_auth); | |
1017 | new->request_key_auth = key_get(key); | |
1018 | ||
1019 | return commit_creds(new); | |
1020 | } | |
1021 | ||
1da177e4 | 1022 | /* |
973c9f4f DH |
1023 | * Instantiate a key with the specified payload and link the key into the |
1024 | * destination keyring if one is given. | |
1025 | * | |
1026 | * The caller must have the appropriate instantiation permit set for this to | |
1027 | * work (see keyctl_assume_authority). No other permissions are required. | |
1028 | * | |
1029 | * If successful, 0 will be returned. | |
1da177e4 | 1030 | */ |
ee009e4a | 1031 | long keyctl_instantiate_key_common(key_serial_t id, |
b353a1f7 | 1032 | struct iov_iter *from, |
ee009e4a | 1033 | key_serial_t ringid) |
1da177e4 | 1034 | { |
d84f4f99 | 1035 | const struct cred *cred = current_cred(); |
3e30148c | 1036 | struct request_key_auth *rka; |
8bbf4976 | 1037 | struct key *instkey, *dest_keyring; |
b353a1f7 | 1038 | size_t plen = from ? iov_iter_count(from) : 0; |
1da177e4 LT |
1039 | void *payload; |
1040 | long ret; | |
1041 | ||
d84f4f99 DH |
1042 | kenter("%d,,%zu,%d", id, plen, ringid); |
1043 | ||
b353a1f7 AV |
1044 | if (!plen) |
1045 | from = NULL; | |
1046 | ||
1da177e4 | 1047 | ret = -EINVAL; |
38bbca6b | 1048 | if (plen > 1024 * 1024 - 1) |
1da177e4 LT |
1049 | goto error; |
1050 | ||
b5f545c8 DH |
1051 | /* the appropriate instantiation authorisation key must have been |
1052 | * assumed before calling this */ | |
1053 | ret = -EPERM; | |
d84f4f99 | 1054 | instkey = cred->request_key_auth; |
b5f545c8 DH |
1055 | if (!instkey) |
1056 | goto error; | |
1057 | ||
146aa8b1 | 1058 | rka = instkey->payload.data[0]; |
b5f545c8 DH |
1059 | if (rka->target_key->serial != id) |
1060 | goto error; | |
1061 | ||
1da177e4 LT |
1062 | /* pull the payload in if one was supplied */ |
1063 | payload = NULL; | |
1064 | ||
b353a1f7 | 1065 | if (from) { |
1da177e4 LT |
1066 | ret = -ENOMEM; |
1067 | payload = kmalloc(plen, GFP_KERNEL); | |
38bbca6b DH |
1068 | if (!payload) { |
1069 | if (plen <= PAGE_SIZE) | |
1070 | goto error; | |
38bbca6b DH |
1071 | payload = vmalloc(plen); |
1072 | if (!payload) | |
1073 | goto error; | |
1074 | } | |
1da177e4 | 1075 | |
b353a1f7 AV |
1076 | ret = -EFAULT; |
1077 | if (copy_from_iter(payload, plen, from) != plen) | |
1da177e4 LT |
1078 | goto error2; |
1079 | } | |
1080 | ||
3e30148c DH |
1081 | /* find the destination keyring amongst those belonging to the |
1082 | * requesting task */ | |
8bbf4976 DH |
1083 | ret = get_instantiation_keyring(ringid, rka, &dest_keyring); |
1084 | if (ret < 0) | |
1085 | goto error2; | |
1da177e4 LT |
1086 | |
1087 | /* instantiate the key and link it into a keyring */ | |
3e30148c | 1088 | ret = key_instantiate_and_link(rka->target_key, payload, plen, |
8bbf4976 | 1089 | dest_keyring, instkey); |
1da177e4 | 1090 | |
8bbf4976 | 1091 | key_put(dest_keyring); |
b5f545c8 DH |
1092 | |
1093 | /* discard the assumed authority if it's just been disabled by | |
1094 | * instantiation of the key */ | |
d84f4f99 DH |
1095 | if (ret == 0) |
1096 | keyctl_change_reqkey_auth(NULL); | |
b5f545c8 DH |
1097 | |
1098 | error2: | |
b353a1f7 | 1099 | kvfree(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) { | |
b353a1f7 AV |
1119 | struct iovec iov; |
1120 | struct iov_iter from; | |
1121 | int ret; | |
ee009e4a | 1122 | |
b353a1f7 AV |
1123 | ret = import_single_range(WRITE, (void __user *)_payload, plen, |
1124 | &iov, &from); | |
1125 | if (unlikely(ret)) | |
1126 | return ret; | |
1127 | ||
1128 | return keyctl_instantiate_key_common(id, &from, ringid); | |
ee009e4a DH |
1129 | } |
1130 | ||
b353a1f7 | 1131 | return keyctl_instantiate_key_common(id, NULL, ringid); |
ee009e4a DH |
1132 | } |
1133 | ||
1134 | /* | |
1135 | * Instantiate a key with the specified multipart payload and link the key into | |
1136 | * the destination keyring if one is given. | |
1137 | * | |
1138 | * The caller must have the appropriate instantiation permit set for this to | |
1139 | * work (see keyctl_assume_authority). No other permissions are required. | |
1140 | * | |
1141 | * If successful, 0 will be returned. | |
1142 | */ | |
1143 | long keyctl_instantiate_key_iov(key_serial_t id, | |
1144 | const struct iovec __user *_payload_iov, | |
1145 | unsigned ioc, | |
1146 | key_serial_t ringid) | |
1147 | { | |
1148 | struct iovec iovstack[UIO_FASTIOV], *iov = iovstack; | |
b353a1f7 | 1149 | struct iov_iter from; |
ee009e4a DH |
1150 | long ret; |
1151 | ||
b353a1f7 AV |
1152 | if (!_payload_iov) |
1153 | ioc = 0; | |
ee009e4a | 1154 | |
b353a1f7 AV |
1155 | ret = import_iovec(WRITE, _payload_iov, ioc, |
1156 | ARRAY_SIZE(iovstack), &iov, &from); | |
ee009e4a | 1157 | if (ret < 0) |
b353a1f7 AV |
1158 | return ret; |
1159 | ret = keyctl_instantiate_key_common(id, &from, ringid); | |
1160 | kfree(iov); | |
ee009e4a | 1161 | return ret; |
ee009e4a DH |
1162 | } |
1163 | ||
1da177e4 | 1164 | /* |
973c9f4f DH |
1165 | * Negatively instantiate the key with the given timeout (in seconds) and link |
1166 | * the key into the destination keyring if one is given. | |
1167 | * | |
1168 | * The caller must have the appropriate instantiation permit set for this to | |
1169 | * work (see keyctl_assume_authority). No other permissions are required. | |
1170 | * | |
1171 | * The key and any links to the key will be automatically garbage collected | |
1172 | * after the timeout expires. | |
1173 | * | |
1174 | * Negative keys are used to rate limit repeated request_key() calls by causing | |
1175 | * them to return -ENOKEY until the negative key expires. | |
1176 | * | |
1177 | * If successful, 0 will be returned. | |
1da177e4 LT |
1178 | */ |
1179 | long keyctl_negate_key(key_serial_t id, unsigned timeout, key_serial_t ringid) | |
fdd1b945 DH |
1180 | { |
1181 | return keyctl_reject_key(id, timeout, ENOKEY, ringid); | |
1182 | } | |
1183 | ||
1184 | /* | |
1185 | * Negatively instantiate the key with the given timeout (in seconds) and error | |
1186 | * code and link the key into the destination keyring if one is given. | |
1187 | * | |
1188 | * The caller must have the appropriate instantiation permit set for this to | |
1189 | * work (see keyctl_assume_authority). No other permissions are required. | |
1190 | * | |
1191 | * The key and any links to the key will be automatically garbage collected | |
1192 | * after the timeout expires. | |
1193 | * | |
1194 | * Negative keys are used to rate limit repeated request_key() calls by causing | |
1195 | * them to return the specified error code until the negative key expires. | |
1196 | * | |
1197 | * If successful, 0 will be returned. | |
1198 | */ | |
1199 | long keyctl_reject_key(key_serial_t id, unsigned timeout, unsigned error, | |
1200 | key_serial_t ringid) | |
1da177e4 | 1201 | { |
d84f4f99 | 1202 | const struct cred *cred = current_cred(); |
3e30148c | 1203 | struct request_key_auth *rka; |
8bbf4976 | 1204 | struct key *instkey, *dest_keyring; |
1da177e4 LT |
1205 | long ret; |
1206 | ||
fdd1b945 DH |
1207 | kenter("%d,%u,%u,%d", id, timeout, error, ringid); |
1208 | ||
1209 | /* must be a valid error code and mustn't be a kernel special */ | |
1210 | if (error <= 0 || | |
1211 | error >= MAX_ERRNO || | |
1212 | error == ERESTARTSYS || | |
1213 | error == ERESTARTNOINTR || | |
1214 | error == ERESTARTNOHAND || | |
1215 | error == ERESTART_RESTARTBLOCK) | |
1216 | return -EINVAL; | |
d84f4f99 | 1217 | |
b5f545c8 DH |
1218 | /* the appropriate instantiation authorisation key must have been |
1219 | * assumed before calling this */ | |
1220 | ret = -EPERM; | |
d84f4f99 | 1221 | instkey = cred->request_key_auth; |
b5f545c8 | 1222 | if (!instkey) |
1da177e4 | 1223 | goto error; |
1da177e4 | 1224 | |
146aa8b1 | 1225 | rka = instkey->payload.data[0]; |
b5f545c8 DH |
1226 | if (rka->target_key->serial != id) |
1227 | goto error; | |
3e30148c | 1228 | |
1da177e4 LT |
1229 | /* find the destination keyring if present (which must also be |
1230 | * writable) */ | |
8bbf4976 DH |
1231 | ret = get_instantiation_keyring(ringid, rka, &dest_keyring); |
1232 | if (ret < 0) | |
1233 | goto error; | |
1da177e4 LT |
1234 | |
1235 | /* instantiate the key and link it into a keyring */ | |
fdd1b945 | 1236 | ret = key_reject_and_link(rka->target_key, timeout, error, |
8bbf4976 | 1237 | dest_keyring, instkey); |
1da177e4 | 1238 | |
8bbf4976 | 1239 | key_put(dest_keyring); |
b5f545c8 DH |
1240 | |
1241 | /* discard the assumed authority if it's just been disabled by | |
1242 | * instantiation of the key */ | |
d84f4f99 DH |
1243 | if (ret == 0) |
1244 | keyctl_change_reqkey_auth(NULL); | |
b5f545c8 DH |
1245 | |
1246 | error: | |
1da177e4 | 1247 | return ret; |
a8b17ed0 | 1248 | } |
1da177e4 | 1249 | |
3e30148c | 1250 | /* |
973c9f4f DH |
1251 | * Read or set the default keyring in which request_key() will cache keys and |
1252 | * return the old setting. | |
1253 | * | |
1254 | * If a process keyring is specified then this will be created if it doesn't | |
1255 | * yet exist. The old setting will be returned if successful. | |
3e30148c DH |
1256 | */ |
1257 | long keyctl_set_reqkey_keyring(int reqkey_defl) | |
1258 | { | |
d84f4f99 DH |
1259 | struct cred *new; |
1260 | int ret, old_setting; | |
1261 | ||
1262 | old_setting = current_cred_xxx(jit_keyring); | |
1263 | ||
1264 | if (reqkey_defl == KEY_REQKEY_DEFL_NO_CHANGE) | |
1265 | return old_setting; | |
1266 | ||
1267 | new = prepare_creds(); | |
1268 | if (!new) | |
1269 | return -ENOMEM; | |
3e30148c DH |
1270 | |
1271 | switch (reqkey_defl) { | |
1272 | case KEY_REQKEY_DEFL_THREAD_KEYRING: | |
d84f4f99 | 1273 | ret = install_thread_keyring_to_cred(new); |
3e30148c | 1274 | if (ret < 0) |
d84f4f99 | 1275 | goto error; |
3e30148c DH |
1276 | goto set; |
1277 | ||
1278 | case KEY_REQKEY_DEFL_PROCESS_KEYRING: | |
d84f4f99 DH |
1279 | ret = install_process_keyring_to_cred(new); |
1280 | if (ret < 0) { | |
1281 | if (ret != -EEXIST) | |
1282 | goto error; | |
1283 | ret = 0; | |
1284 | } | |
1285 | goto set; | |
3e30148c DH |
1286 | |
1287 | case KEY_REQKEY_DEFL_DEFAULT: | |
1288 | case KEY_REQKEY_DEFL_SESSION_KEYRING: | |
1289 | case KEY_REQKEY_DEFL_USER_KEYRING: | |
1290 | case KEY_REQKEY_DEFL_USER_SESSION_KEYRING: | |
d84f4f99 DH |
1291 | case KEY_REQKEY_DEFL_REQUESTOR_KEYRING: |
1292 | goto set; | |
3e30148c DH |
1293 | |
1294 | case KEY_REQKEY_DEFL_NO_CHANGE: | |
3e30148c DH |
1295 | case KEY_REQKEY_DEFL_GROUP_KEYRING: |
1296 | default: | |
d84f4f99 DH |
1297 | ret = -EINVAL; |
1298 | goto error; | |
3e30148c DH |
1299 | } |
1300 | ||
d84f4f99 DH |
1301 | set: |
1302 | new->jit_keyring = reqkey_defl; | |
1303 | commit_creds(new); | |
1304 | return old_setting; | |
1305 | error: | |
1306 | abort_creds(new); | |
4303ef19 | 1307 | return ret; |
a8b17ed0 | 1308 | } |
d84f4f99 | 1309 | |
017679c4 | 1310 | /* |
973c9f4f DH |
1311 | * Set or clear the timeout on a key. |
1312 | * | |
1313 | * Either the key must grant the caller Setattr permission or else the caller | |
1314 | * must hold an instantiation authorisation token for the key. | |
1315 | * | |
1316 | * The timeout is either 0 to clear the timeout, or a number of seconds from | |
1317 | * the current time. The key and any links to the key will be automatically | |
1318 | * garbage collected after the timeout expires. | |
1319 | * | |
d3600bcf MZ |
1320 | * Keys with KEY_FLAG_KEEP set should not be timed out. |
1321 | * | |
973c9f4f | 1322 | * If successful, 0 is returned. |
017679c4 DH |
1323 | */ |
1324 | long keyctl_set_timeout(key_serial_t id, unsigned timeout) | |
1325 | { | |
9156235b | 1326 | struct key *key, *instkey; |
017679c4 | 1327 | key_ref_t key_ref; |
017679c4 DH |
1328 | long ret; |
1329 | ||
5593122e | 1330 | key_ref = lookup_user_key(id, KEY_LOOKUP_CREATE | KEY_LOOKUP_PARTIAL, |
f5895943 | 1331 | KEY_NEED_SETATTR); |
017679c4 | 1332 | if (IS_ERR(key_ref)) { |
9156235b DH |
1333 | /* setting the timeout on a key under construction is permitted |
1334 | * if we have the authorisation token handy */ | |
1335 | if (PTR_ERR(key_ref) == -EACCES) { | |
1336 | instkey = key_get_instantiation_authkey(id); | |
1337 | if (!IS_ERR(instkey)) { | |
1338 | key_put(instkey); | |
1339 | key_ref = lookup_user_key(id, | |
1340 | KEY_LOOKUP_PARTIAL, | |
1341 | 0); | |
1342 | if (!IS_ERR(key_ref)) | |
1343 | goto okay; | |
1344 | } | |
1345 | } | |
1346 | ||
017679c4 DH |
1347 | ret = PTR_ERR(key_ref); |
1348 | goto error; | |
1349 | } | |
1350 | ||
9156235b | 1351 | okay: |
017679c4 | 1352 | key = key_ref_to_ptr(key_ref); |
1d6d167c | 1353 | ret = 0; |
d3600bcf MZ |
1354 | if (test_bit(KEY_FLAG_KEEP, &key->flags)) |
1355 | ret = -EPERM; | |
1d6d167c | 1356 | else |
d3600bcf | 1357 | key_set_timeout(key, timeout); |
017679c4 DH |
1358 | key_put(key); |
1359 | ||
017679c4 DH |
1360 | error: |
1361 | return ret; | |
a8b17ed0 | 1362 | } |
017679c4 | 1363 | |
b5f545c8 | 1364 | /* |
973c9f4f DH |
1365 | * Assume (or clear) the authority to instantiate the specified key. |
1366 | * | |
1367 | * This sets the authoritative token currently in force for key instantiation. | |
1368 | * This must be done for a key to be instantiated. It has the effect of making | |
1369 | * available all the keys from the caller of the request_key() that created a | |
1370 | * key to request_key() calls made by the caller of this function. | |
1371 | * | |
1372 | * The caller must have the instantiation key in their process keyrings with a | |
1373 | * Search permission grant available to the caller. | |
1374 | * | |
1375 | * If the ID given is 0, then the setting will be cleared and 0 returned. | |
1376 | * | |
1377 | * If the ID given has a matching an authorisation key, then that key will be | |
1378 | * set and its ID will be returned. The authorisation key can be read to get | |
1379 | * the callout information passed to request_key(). | |
b5f545c8 DH |
1380 | */ |
1381 | long keyctl_assume_authority(key_serial_t id) | |
1382 | { | |
1383 | struct key *authkey; | |
1384 | long ret; | |
1385 | ||
1386 | /* special key IDs aren't permitted */ | |
1387 | ret = -EINVAL; | |
1388 | if (id < 0) | |
1389 | goto error; | |
1390 | ||
1391 | /* we divest ourselves of authority if given an ID of 0 */ | |
1392 | if (id == 0) { | |
d84f4f99 | 1393 | ret = keyctl_change_reqkey_auth(NULL); |
b5f545c8 DH |
1394 | goto error; |
1395 | } | |
1396 | ||
1397 | /* attempt to assume the authority temporarily granted to us whilst we | |
1398 | * instantiate the specified key | |
1399 | * - the authorisation key must be in the current task's keyrings | |
1400 | * somewhere | |
1401 | */ | |
1402 | authkey = key_get_instantiation_authkey(id); | |
1403 | if (IS_ERR(authkey)) { | |
1404 | ret = PTR_ERR(authkey); | |
1405 | goto error; | |
1406 | } | |
1407 | ||
d84f4f99 DH |
1408 | ret = keyctl_change_reqkey_auth(authkey); |
1409 | if (ret < 0) | |
1410 | goto error; | |
1411 | key_put(authkey); | |
b5f545c8 | 1412 | |
d84f4f99 | 1413 | ret = authkey->serial; |
b5f545c8 DH |
1414 | error: |
1415 | return ret; | |
a8b17ed0 | 1416 | } |
b5f545c8 | 1417 | |
70a5bb72 | 1418 | /* |
973c9f4f DH |
1419 | * Get a key's the LSM security label. |
1420 | * | |
1421 | * The key must grant the caller View permission for this to work. | |
1422 | * | |
1423 | * If there's a buffer, then up to buflen bytes of data will be placed into it. | |
1424 | * | |
1425 | * If successful, the amount of information available will be returned, | |
1426 | * irrespective of how much was copied (including the terminal NUL). | |
70a5bb72 DH |
1427 | */ |
1428 | long keyctl_get_security(key_serial_t keyid, | |
1429 | char __user *buffer, | |
1430 | size_t buflen) | |
1431 | { | |
1432 | struct key *key, *instkey; | |
1433 | key_ref_t key_ref; | |
1434 | char *context; | |
1435 | long ret; | |
1436 | ||
f5895943 | 1437 | key_ref = lookup_user_key(keyid, KEY_LOOKUP_PARTIAL, KEY_NEED_VIEW); |
70a5bb72 DH |
1438 | if (IS_ERR(key_ref)) { |
1439 | if (PTR_ERR(key_ref) != -EACCES) | |
1440 | return PTR_ERR(key_ref); | |
1441 | ||
1442 | /* viewing a key under construction is also permitted if we | |
1443 | * have the authorisation token handy */ | |
1444 | instkey = key_get_instantiation_authkey(keyid); | |
1445 | if (IS_ERR(instkey)) | |
fa1cc7b5 | 1446 | return PTR_ERR(instkey); |
70a5bb72 DH |
1447 | key_put(instkey); |
1448 | ||
5593122e | 1449 | key_ref = lookup_user_key(keyid, KEY_LOOKUP_PARTIAL, 0); |
70a5bb72 DH |
1450 | if (IS_ERR(key_ref)) |
1451 | return PTR_ERR(key_ref); | |
1452 | } | |
1453 | ||
1454 | key = key_ref_to_ptr(key_ref); | |
1455 | ret = security_key_getsecurity(key, &context); | |
1456 | if (ret == 0) { | |
1457 | /* if no information was returned, give userspace an empty | |
1458 | * string */ | |
1459 | ret = 1; | |
1460 | if (buffer && buflen > 0 && | |
1461 | copy_to_user(buffer, "", 1) != 0) | |
1462 | ret = -EFAULT; | |
1463 | } else if (ret > 0) { | |
1464 | /* return as much data as there's room for */ | |
1465 | if (buffer && buflen > 0) { | |
1466 | if (buflen > ret) | |
1467 | buflen = ret; | |
1468 | ||
1469 | if (copy_to_user(buffer, context, buflen) != 0) | |
1470 | ret = -EFAULT; | |
1471 | } | |
1472 | ||
1473 | kfree(context); | |
1474 | } | |
1475 | ||
1476 | key_ref_put(key_ref); | |
1477 | return ret; | |
1478 | } | |
1479 | ||
ee18d64c | 1480 | /* |
973c9f4f DH |
1481 | * Attempt to install the calling process's session keyring on the process's |
1482 | * parent process. | |
1483 | * | |
1484 | * The keyring must exist and must grant the caller LINK permission, and the | |
1485 | * parent process must be single-threaded and must have the same effective | |
1486 | * ownership as this process and mustn't be SUID/SGID. | |
1487 | * | |
1488 | * The keyring will be emplaced on the parent when it next resumes userspace. | |
1489 | * | |
1490 | * If successful, 0 will be returned. | |
ee18d64c DH |
1491 | */ |
1492 | long keyctl_session_to_parent(void) | |
1493 | { | |
1494 | struct task_struct *me, *parent; | |
1495 | const struct cred *mycred, *pcred; | |
67d12145 | 1496 | struct callback_head *newwork, *oldwork; |
ee18d64c | 1497 | key_ref_t keyring_r; |
413cd3d9 | 1498 | struct cred *cred; |
ee18d64c DH |
1499 | int ret; |
1500 | ||
f5895943 | 1501 | keyring_r = lookup_user_key(KEY_SPEC_SESSION_KEYRING, 0, KEY_NEED_LINK); |
ee18d64c DH |
1502 | if (IS_ERR(keyring_r)) |
1503 | return PTR_ERR(keyring_r); | |
1504 | ||
413cd3d9 | 1505 | ret = -ENOMEM; |
413cd3d9 | 1506 | |
ee18d64c DH |
1507 | /* our parent is going to need a new cred struct, a new tgcred struct |
1508 | * and new security data, so we allocate them here to prevent ENOMEM in | |
1509 | * our parent */ | |
ee18d64c DH |
1510 | cred = cred_alloc_blank(); |
1511 | if (!cred) | |
67d12145 AV |
1512 | goto error_keyring; |
1513 | newwork = &cred->rcu; | |
ee18d64c | 1514 | |
3a50597d DH |
1515 | cred->session_keyring = key_ref_to_ptr(keyring_r); |
1516 | keyring_r = NULL; | |
67d12145 | 1517 | init_task_work(newwork, key_change_session_keyring); |
ee18d64c DH |
1518 | |
1519 | me = current; | |
9d1ac65a | 1520 | rcu_read_lock(); |
ee18d64c DH |
1521 | write_lock_irq(&tasklist_lock); |
1522 | ||
ee18d64c | 1523 | ret = -EPERM; |
413cd3d9 ON |
1524 | oldwork = NULL; |
1525 | parent = me->real_parent; | |
ee18d64c DH |
1526 | |
1527 | /* the parent mustn't be init and mustn't be a kernel thread */ | |
1528 | if (parent->pid <= 1 || !parent->mm) | |
413cd3d9 | 1529 | goto unlock; |
ee18d64c DH |
1530 | |
1531 | /* the parent must be single threaded */ | |
dd98acf7 | 1532 | if (!thread_group_empty(parent)) |
413cd3d9 | 1533 | goto unlock; |
ee18d64c DH |
1534 | |
1535 | /* the parent and the child must have different session keyrings or | |
1536 | * there's no point */ | |
1537 | mycred = current_cred(); | |
1538 | pcred = __task_cred(parent); | |
1539 | if (mycred == pcred || | |
3a50597d | 1540 | mycred->session_keyring == pcred->session_keyring) { |
413cd3d9 ON |
1541 | ret = 0; |
1542 | goto unlock; | |
1543 | } | |
ee18d64c DH |
1544 | |
1545 | /* the parent must have the same effective ownership and mustn't be | |
1546 | * SUID/SGID */ | |
9a56c2db EB |
1547 | if (!uid_eq(pcred->uid, mycred->euid) || |
1548 | !uid_eq(pcred->euid, mycred->euid) || | |
1549 | !uid_eq(pcred->suid, mycred->euid) || | |
1550 | !gid_eq(pcred->gid, mycred->egid) || | |
1551 | !gid_eq(pcred->egid, mycred->egid) || | |
1552 | !gid_eq(pcred->sgid, mycred->egid)) | |
413cd3d9 | 1553 | goto unlock; |
ee18d64c DH |
1554 | |
1555 | /* the keyrings must have the same UID */ | |
3a50597d | 1556 | if ((pcred->session_keyring && |
2a74dbb9 LT |
1557 | !uid_eq(pcred->session_keyring->uid, mycred->euid)) || |
1558 | !uid_eq(mycred->session_keyring->uid, mycred->euid)) | |
413cd3d9 | 1559 | goto unlock; |
ee18d64c | 1560 | |
413cd3d9 ON |
1561 | /* cancel an already pending keyring replacement */ |
1562 | oldwork = task_work_cancel(parent, key_change_session_keyring); | |
ee18d64c DH |
1563 | |
1564 | /* the replacement session keyring is applied just prior to userspace | |
1565 | * restarting */ | |
67d12145 | 1566 | ret = task_work_add(parent, newwork, true); |
413cd3d9 ON |
1567 | if (!ret) |
1568 | newwork = NULL; | |
1569 | unlock: | |
ee18d64c | 1570 | write_unlock_irq(&tasklist_lock); |
9d1ac65a | 1571 | rcu_read_unlock(); |
67d12145 AV |
1572 | if (oldwork) |
1573 | put_cred(container_of(oldwork, struct cred, rcu)); | |
1574 | if (newwork) | |
1575 | put_cred(cred); | |
ee18d64c DH |
1576 | return ret; |
1577 | ||
1578 | error_keyring: | |
1579 | key_ref_put(keyring_r); | |
1580 | return ret; | |
1581 | } | |
1582 | ||
1da177e4 | 1583 | /* |
973c9f4f | 1584 | * The key control system call |
1da177e4 | 1585 | */ |
938bb9f5 HC |
1586 | SYSCALL_DEFINE5(keyctl, int, option, unsigned long, arg2, unsigned long, arg3, |
1587 | unsigned long, arg4, unsigned long, arg5) | |
1da177e4 LT |
1588 | { |
1589 | switch (option) { | |
1590 | case KEYCTL_GET_KEYRING_ID: | |
1591 | return keyctl_get_keyring_ID((key_serial_t) arg2, | |
1592 | (int) arg3); | |
1593 | ||
1594 | case KEYCTL_JOIN_SESSION_KEYRING: | |
1595 | return keyctl_join_session_keyring((const char __user *) arg2); | |
1596 | ||
1597 | case KEYCTL_UPDATE: | |
1598 | return keyctl_update_key((key_serial_t) arg2, | |
1599 | (const void __user *) arg3, | |
1600 | (size_t) arg4); | |
1601 | ||
1602 | case KEYCTL_REVOKE: | |
1603 | return keyctl_revoke_key((key_serial_t) arg2); | |
1604 | ||
1605 | case KEYCTL_DESCRIBE: | |
1606 | return keyctl_describe_key((key_serial_t) arg2, | |
1607 | (char __user *) arg3, | |
1608 | (unsigned) arg4); | |
1609 | ||
1610 | case KEYCTL_CLEAR: | |
1611 | return keyctl_keyring_clear((key_serial_t) arg2); | |
1612 | ||
1613 | case KEYCTL_LINK: | |
1614 | return keyctl_keyring_link((key_serial_t) arg2, | |
1615 | (key_serial_t) arg3); | |
1616 | ||
1617 | case KEYCTL_UNLINK: | |
1618 | return keyctl_keyring_unlink((key_serial_t) arg2, | |
1619 | (key_serial_t) arg3); | |
1620 | ||
1621 | case KEYCTL_SEARCH: | |
1622 | return keyctl_keyring_search((key_serial_t) arg2, | |
1623 | (const char __user *) arg3, | |
1624 | (const char __user *) arg4, | |
1625 | (key_serial_t) arg5); | |
1626 | ||
1627 | case KEYCTL_READ: | |
1628 | return keyctl_read_key((key_serial_t) arg2, | |
1629 | (char __user *) arg3, | |
1630 | (size_t) arg4); | |
1631 | ||
1632 | case KEYCTL_CHOWN: | |
1633 | return keyctl_chown_key((key_serial_t) arg2, | |
1634 | (uid_t) arg3, | |
1635 | (gid_t) arg4); | |
1636 | ||
1637 | case KEYCTL_SETPERM: | |
1638 | return keyctl_setperm_key((key_serial_t) arg2, | |
1639 | (key_perm_t) arg3); | |
1640 | ||
1641 | case KEYCTL_INSTANTIATE: | |
1642 | return keyctl_instantiate_key((key_serial_t) arg2, | |
1643 | (const void __user *) arg3, | |
1644 | (size_t) arg4, | |
1645 | (key_serial_t) arg5); | |
1646 | ||
1647 | case KEYCTL_NEGATE: | |
1648 | return keyctl_negate_key((key_serial_t) arg2, | |
1649 | (unsigned) arg3, | |
1650 | (key_serial_t) arg4); | |
1651 | ||
3e30148c DH |
1652 | case KEYCTL_SET_REQKEY_KEYRING: |
1653 | return keyctl_set_reqkey_keyring(arg2); | |
1654 | ||
017679c4 DH |
1655 | case KEYCTL_SET_TIMEOUT: |
1656 | return keyctl_set_timeout((key_serial_t) arg2, | |
1657 | (unsigned) arg3); | |
1658 | ||
b5f545c8 DH |
1659 | case KEYCTL_ASSUME_AUTHORITY: |
1660 | return keyctl_assume_authority((key_serial_t) arg2); | |
1661 | ||
70a5bb72 DH |
1662 | case KEYCTL_GET_SECURITY: |
1663 | return keyctl_get_security((key_serial_t) arg2, | |
90bd49ab | 1664 | (char __user *) arg3, |
70a5bb72 DH |
1665 | (size_t) arg4); |
1666 | ||
ee18d64c DH |
1667 | case KEYCTL_SESSION_TO_PARENT: |
1668 | return keyctl_session_to_parent(); | |
1669 | ||
fdd1b945 DH |
1670 | case KEYCTL_REJECT: |
1671 | return keyctl_reject_key((key_serial_t) arg2, | |
1672 | (unsigned) arg3, | |
1673 | (unsigned) arg4, | |
1674 | (key_serial_t) arg5); | |
1675 | ||
ee009e4a DH |
1676 | case KEYCTL_INSTANTIATE_IOV: |
1677 | return keyctl_instantiate_key_iov( | |
1678 | (key_serial_t) arg2, | |
1679 | (const struct iovec __user *) arg3, | |
1680 | (unsigned) arg4, | |
1681 | (key_serial_t) arg5); | |
1682 | ||
fd75815f DH |
1683 | case KEYCTL_INVALIDATE: |
1684 | return keyctl_invalidate_key((key_serial_t) arg2); | |
1685 | ||
f36f8c75 DH |
1686 | case KEYCTL_GET_PERSISTENT: |
1687 | return keyctl_get_persistent((uid_t)arg2, (key_serial_t)arg3); | |
1688 | ||
1da177e4 LT |
1689 | default: |
1690 | return -EOPNOTSUPP; | |
1691 | } | |
a8b17ed0 | 1692 | } |