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Commit | Line | Data |
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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> | |
29930025 | 15 | #include <linux/sched/task.h> |
1da177e4 LT |
16 | #include <linux/slab.h> |
17 | #include <linux/syscalls.h> | |
59e6b9c1 | 18 | #include <linux/key.h> |
1da177e4 LT |
19 | #include <linux/keyctl.h> |
20 | #include <linux/fs.h> | |
c59ede7b | 21 | #include <linux/capability.h> |
5b825c3a | 22 | #include <linux/cred.h> |
0cb409d9 | 23 | #include <linux/string.h> |
1da177e4 | 24 | #include <linux/err.h> |
38bbca6b | 25 | #include <linux/vmalloc.h> |
70a5bb72 | 26 | #include <linux/security.h> |
a27bb332 | 27 | #include <linux/uio.h> |
7c0f6ba6 | 28 | #include <linux/uaccess.h> |
1da177e4 LT |
29 | #include "internal.h" |
30 | ||
aa9d4437 DH |
31 | #define KEY_MAX_DESC_SIZE 4096 |
32 | ||
0cb409d9 DA |
33 | static int key_get_type_from_user(char *type, |
34 | const char __user *_type, | |
35 | unsigned len) | |
36 | { | |
37 | int ret; | |
38 | ||
39 | ret = strncpy_from_user(type, _type, len); | |
0cb409d9 | 40 | if (ret < 0) |
4303ef19 | 41 | return ret; |
0cb409d9 DA |
42 | if (ret == 0 || ret >= len) |
43 | return -EINVAL; | |
54e2c2c1 DH |
44 | if (type[0] == '.') |
45 | return -EPERM; | |
0cb409d9 | 46 | type[len - 1] = '\0'; |
0cb409d9 DA |
47 | return 0; |
48 | } | |
49 | ||
1da177e4 | 50 | /* |
973c9f4f DH |
51 | * Extract the description of a new key from userspace and either add it as a |
52 | * new key to the specified keyring or update a matching key in that keyring. | |
53 | * | |
cf7f601c DH |
54 | * If the description is NULL or an empty string, the key type is asked to |
55 | * generate one from the payload. | |
56 | * | |
973c9f4f DH |
57 | * The keyring must be writable so that we can attach the key to it. |
58 | * | |
59 | * If successful, the new key's serial number is returned, otherwise an error | |
60 | * code is returned. | |
1da177e4 | 61 | */ |
1e7bfb21 HC |
62 | SYSCALL_DEFINE5(add_key, const char __user *, _type, |
63 | const char __user *, _description, | |
64 | const void __user *, _payload, | |
65 | size_t, plen, | |
66 | key_serial_t, ringid) | |
1da177e4 | 67 | { |
664cceb0 | 68 | key_ref_t keyring_ref, key_ref; |
1da177e4 LT |
69 | char type[32], *description; |
70 | void *payload; | |
0cb409d9 | 71 | long ret; |
1da177e4 LT |
72 | |
73 | ret = -EINVAL; | |
38bbca6b | 74 | if (plen > 1024 * 1024 - 1) |
1da177e4 LT |
75 | goto error; |
76 | ||
77 | /* draw all the data into kernel space */ | |
0cb409d9 | 78 | ret = key_get_type_from_user(type, _type, sizeof(type)); |
1da177e4 LT |
79 | if (ret < 0) |
80 | goto error; | |
1da177e4 | 81 | |
cf7f601c DH |
82 | description = NULL; |
83 | if (_description) { | |
aa9d4437 | 84 | description = strndup_user(_description, KEY_MAX_DESC_SIZE); |
cf7f601c DH |
85 | if (IS_ERR(description)) { |
86 | ret = PTR_ERR(description); | |
87 | goto error; | |
88 | } | |
89 | if (!*description) { | |
90 | kfree(description); | |
91 | description = NULL; | |
a4e3b8d7 MZ |
92 | } else if ((description[0] == '.') && |
93 | (strncmp(type, "keyring", 7) == 0)) { | |
94 | ret = -EPERM; | |
95 | goto error2; | |
cf7f601c | 96 | } |
0cb409d9 | 97 | } |
1da177e4 LT |
98 | |
99 | /* pull the payload in if one was supplied */ | |
100 | payload = NULL; | |
101 | ||
102 | if (_payload) { | |
103 | ret = -ENOMEM; | |
4f1c28d2 | 104 | payload = kmalloc(plen, GFP_KERNEL | __GFP_NOWARN); |
38bbca6b DH |
105 | if (!payload) { |
106 | if (plen <= PAGE_SIZE) | |
107 | goto error2; | |
38bbca6b DH |
108 | payload = vmalloc(plen); |
109 | if (!payload) | |
110 | goto error2; | |
111 | } | |
1da177e4 LT |
112 | |
113 | ret = -EFAULT; | |
114 | if (copy_from_user(payload, _payload, plen) != 0) | |
115 | goto error3; | |
116 | } | |
117 | ||
118 | /* find the target keyring (which must be writable) */ | |
f5895943 | 119 | keyring_ref = lookup_user_key(ringid, KEY_LOOKUP_CREATE, KEY_NEED_WRITE); |
664cceb0 DH |
120 | if (IS_ERR(keyring_ref)) { |
121 | ret = PTR_ERR(keyring_ref); | |
1da177e4 LT |
122 | goto error3; |
123 | } | |
124 | ||
125 | /* create or update the requested key and add it to the target | |
126 | * keyring */ | |
664cceb0 | 127 | key_ref = key_create_or_update(keyring_ref, type, description, |
6b79ccb5 AR |
128 | payload, plen, KEY_PERM_UNDEF, |
129 | KEY_ALLOC_IN_QUOTA); | |
664cceb0 DH |
130 | if (!IS_ERR(key_ref)) { |
131 | ret = key_ref_to_ptr(key_ref)->serial; | |
132 | key_ref_put(key_ref); | |
1da177e4 LT |
133 | } |
134 | else { | |
664cceb0 | 135 | ret = PTR_ERR(key_ref); |
1da177e4 LT |
136 | } |
137 | ||
664cceb0 | 138 | key_ref_put(keyring_ref); |
1da177e4 | 139 | error3: |
d0e0eba0 | 140 | kvfree(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 */ |
aa9d4437 | 178 | description = strndup_user(_description, KEY_MAX_DESC_SIZE); |
0cb409d9 DA |
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 | |
ee8f844e DH |
276 | * be skipped over. It is not permitted for userspace to create or join |
277 | * keyrings whose name begin with a dot. | |
973c9f4f DH |
278 | * |
279 | * If successful, the ID of the joined session keyring will be returned. | |
1da177e4 LT |
280 | */ |
281 | long keyctl_join_session_keyring(const char __user *_name) | |
282 | { | |
283 | char *name; | |
0cb409d9 | 284 | long ret; |
1da177e4 LT |
285 | |
286 | /* fetch the name from userspace */ | |
287 | name = NULL; | |
288 | if (_name) { | |
aa9d4437 | 289 | name = strndup_user(_name, KEY_MAX_DESC_SIZE); |
0cb409d9 DA |
290 | if (IS_ERR(name)) { |
291 | ret = PTR_ERR(name); | |
1da177e4 | 292 | goto error; |
0cb409d9 | 293 | } |
ee8f844e DH |
294 | |
295 | ret = -EPERM; | |
296 | if (name[0] == '.') | |
297 | goto error_name; | |
1da177e4 LT |
298 | } |
299 | ||
300 | /* join the session */ | |
301 | ret = join_session_keyring(name); | |
ee8f844e | 302 | error_name: |
0d54ee1c | 303 | kfree(name); |
c5b60b5e | 304 | error: |
1da177e4 | 305 | return ret; |
a8b17ed0 | 306 | } |
1da177e4 | 307 | |
1da177e4 | 308 | /* |
973c9f4f DH |
309 | * Update a key's data payload from the given data. |
310 | * | |
311 | * The key must grant the caller Write permission and the key type must support | |
312 | * updating for this to work. A negative key can be positively instantiated | |
313 | * with this call. | |
314 | * | |
315 | * If successful, 0 will be returned. If the key type does not support | |
316 | * updating, then -EOPNOTSUPP will be returned. | |
1da177e4 LT |
317 | */ |
318 | long keyctl_update_key(key_serial_t id, | |
319 | const void __user *_payload, | |
320 | size_t plen) | |
321 | { | |
664cceb0 | 322 | key_ref_t key_ref; |
1da177e4 LT |
323 | void *payload; |
324 | long ret; | |
325 | ||
326 | ret = -EINVAL; | |
327 | if (plen > PAGE_SIZE) | |
328 | goto error; | |
329 | ||
330 | /* pull the payload in if one was supplied */ | |
331 | payload = NULL; | |
332 | if (_payload) { | |
333 | ret = -ENOMEM; | |
334 | payload = kmalloc(plen, GFP_KERNEL); | |
335 | if (!payload) | |
336 | goto error; | |
337 | ||
338 | ret = -EFAULT; | |
339 | if (copy_from_user(payload, _payload, plen) != 0) | |
340 | goto error2; | |
341 | } | |
342 | ||
343 | /* find the target key (which must be writable) */ | |
f5895943 | 344 | key_ref = lookup_user_key(id, 0, KEY_NEED_WRITE); |
664cceb0 DH |
345 | if (IS_ERR(key_ref)) { |
346 | ret = PTR_ERR(key_ref); | |
1da177e4 LT |
347 | goto error2; |
348 | } | |
349 | ||
350 | /* update the key */ | |
664cceb0 | 351 | ret = key_update(key_ref, payload, plen); |
1da177e4 | 352 | |
664cceb0 | 353 | key_ref_put(key_ref); |
c5b60b5e | 354 | error2: |
1da177e4 | 355 | kfree(payload); |
c5b60b5e | 356 | error: |
1da177e4 | 357 | return ret; |
a8b17ed0 | 358 | } |
1da177e4 | 359 | |
1da177e4 | 360 | /* |
973c9f4f DH |
361 | * Revoke a key. |
362 | * | |
363 | * The key must be grant the caller Write or Setattr permission for this to | |
364 | * work. The key type should give up its quota claim when revoked. The key | |
365 | * and any links to the key will be automatically garbage collected after a | |
366 | * certain amount of time (/proc/sys/kernel/keys/gc_delay). | |
367 | * | |
d3600bcf MZ |
368 | * Keys with KEY_FLAG_KEEP set should not be revoked. |
369 | * | |
973c9f4f | 370 | * If successful, 0 is returned. |
1da177e4 LT |
371 | */ |
372 | long keyctl_revoke_key(key_serial_t id) | |
373 | { | |
664cceb0 | 374 | key_ref_t key_ref; |
d3600bcf | 375 | struct key *key; |
1da177e4 LT |
376 | long ret; |
377 | ||
f5895943 | 378 | key_ref = lookup_user_key(id, 0, KEY_NEED_WRITE); |
664cceb0 DH |
379 | if (IS_ERR(key_ref)) { |
380 | ret = PTR_ERR(key_ref); | |
0c2c9a3f DH |
381 | if (ret != -EACCES) |
382 | goto error; | |
f5895943 | 383 | key_ref = lookup_user_key(id, 0, KEY_NEED_SETATTR); |
0c2c9a3f DH |
384 | if (IS_ERR(key_ref)) { |
385 | ret = PTR_ERR(key_ref); | |
386 | goto error; | |
387 | } | |
1da177e4 LT |
388 | } |
389 | ||
d3600bcf | 390 | key = key_ref_to_ptr(key_ref); |
1da177e4 | 391 | ret = 0; |
d3600bcf | 392 | if (test_bit(KEY_FLAG_KEEP, &key->flags)) |
1d6d167c MZ |
393 | ret = -EPERM; |
394 | else | |
d3600bcf | 395 | key_revoke(key); |
1da177e4 | 396 | |
664cceb0 | 397 | key_ref_put(key_ref); |
c5b60b5e | 398 | error: |
1260f801 | 399 | return ret; |
a8b17ed0 | 400 | } |
1da177e4 | 401 | |
fd75815f DH |
402 | /* |
403 | * Invalidate a key. | |
404 | * | |
405 | * The key must be grant the caller Invalidate permission for this to work. | |
406 | * The key and any links to the key will be automatically garbage collected | |
407 | * immediately. | |
408 | * | |
d3600bcf MZ |
409 | * Keys with KEY_FLAG_KEEP set should not be invalidated. |
410 | * | |
fd75815f DH |
411 | * If successful, 0 is returned. |
412 | */ | |
413 | long keyctl_invalidate_key(key_serial_t id) | |
414 | { | |
415 | key_ref_t key_ref; | |
d3600bcf | 416 | struct key *key; |
fd75815f DH |
417 | long ret; |
418 | ||
419 | kenter("%d", id); | |
420 | ||
f5895943 | 421 | key_ref = lookup_user_key(id, 0, KEY_NEED_SEARCH); |
fd75815f DH |
422 | if (IS_ERR(key_ref)) { |
423 | ret = PTR_ERR(key_ref); | |
0c7774ab DH |
424 | |
425 | /* Root is permitted to invalidate certain special keys */ | |
426 | if (capable(CAP_SYS_ADMIN)) { | |
427 | key_ref = lookup_user_key(id, 0, 0); | |
428 | if (IS_ERR(key_ref)) | |
429 | goto error; | |
430 | if (test_bit(KEY_FLAG_ROOT_CAN_INVAL, | |
431 | &key_ref_to_ptr(key_ref)->flags)) | |
432 | goto invalidate; | |
433 | goto error_put; | |
434 | } | |
435 | ||
fd75815f DH |
436 | goto error; |
437 | } | |
438 | ||
0c7774ab | 439 | invalidate: |
d3600bcf | 440 | key = key_ref_to_ptr(key_ref); |
fd75815f | 441 | ret = 0; |
d3600bcf MZ |
442 | if (test_bit(KEY_FLAG_KEEP, &key->flags)) |
443 | ret = -EPERM; | |
1d6d167c | 444 | else |
d3600bcf | 445 | key_invalidate(key); |
0c7774ab | 446 | error_put: |
fd75815f DH |
447 | key_ref_put(key_ref); |
448 | error: | |
449 | kleave(" = %ld", ret); | |
450 | return ret; | |
451 | } | |
452 | ||
1da177e4 | 453 | /* |
973c9f4f DH |
454 | * Clear the specified keyring, creating an empty process keyring if one of the |
455 | * special keyring IDs is used. | |
456 | * | |
d3600bcf MZ |
457 | * The keyring must grant the caller Write permission and not have |
458 | * KEY_FLAG_KEEP set for this to work. If successful, 0 will be returned. | |
1da177e4 LT |
459 | */ |
460 | long keyctl_keyring_clear(key_serial_t ringid) | |
461 | { | |
664cceb0 | 462 | key_ref_t keyring_ref; |
d3600bcf | 463 | struct key *keyring; |
1da177e4 LT |
464 | long ret; |
465 | ||
f5895943 | 466 | keyring_ref = lookup_user_key(ringid, KEY_LOOKUP_CREATE, KEY_NEED_WRITE); |
664cceb0 DH |
467 | if (IS_ERR(keyring_ref)) { |
468 | ret = PTR_ERR(keyring_ref); | |
700920eb DH |
469 | |
470 | /* Root is permitted to invalidate certain special keyrings */ | |
471 | if (capable(CAP_SYS_ADMIN)) { | |
472 | keyring_ref = lookup_user_key(ringid, 0, 0); | |
473 | if (IS_ERR(keyring_ref)) | |
474 | goto error; | |
475 | if (test_bit(KEY_FLAG_ROOT_CAN_CLEAR, | |
476 | &key_ref_to_ptr(keyring_ref)->flags)) | |
477 | goto clear; | |
478 | goto error_put; | |
479 | } | |
480 | ||
1da177e4 LT |
481 | goto error; |
482 | } | |
483 | ||
700920eb | 484 | clear: |
d3600bcf MZ |
485 | keyring = key_ref_to_ptr(keyring_ref); |
486 | if (test_bit(KEY_FLAG_KEEP, &keyring->flags)) | |
487 | ret = -EPERM; | |
488 | else | |
489 | ret = keyring_clear(keyring); | |
700920eb | 490 | error_put: |
664cceb0 | 491 | key_ref_put(keyring_ref); |
c5b60b5e | 492 | error: |
1da177e4 | 493 | return ret; |
a8b17ed0 | 494 | } |
1da177e4 | 495 | |
1da177e4 | 496 | /* |
973c9f4f DH |
497 | * Create a link from a keyring to a key if there's no matching key in the |
498 | * keyring, otherwise replace the link to the matching key with a link to the | |
499 | * new key. | |
500 | * | |
501 | * The key must grant the caller Link permission and the the keyring must grant | |
502 | * the caller Write permission. Furthermore, if an additional link is created, | |
503 | * the keyring's quota will be extended. | |
504 | * | |
505 | * If successful, 0 will be returned. | |
1da177e4 LT |
506 | */ |
507 | long keyctl_keyring_link(key_serial_t id, key_serial_t ringid) | |
508 | { | |
664cceb0 | 509 | key_ref_t keyring_ref, key_ref; |
1da177e4 LT |
510 | long ret; |
511 | ||
f5895943 | 512 | keyring_ref = lookup_user_key(ringid, KEY_LOOKUP_CREATE, KEY_NEED_WRITE); |
664cceb0 DH |
513 | if (IS_ERR(keyring_ref)) { |
514 | ret = PTR_ERR(keyring_ref); | |
1da177e4 LT |
515 | goto error; |
516 | } | |
517 | ||
f5895943 | 518 | key_ref = lookup_user_key(id, KEY_LOOKUP_CREATE, KEY_NEED_LINK); |
664cceb0 DH |
519 | if (IS_ERR(key_ref)) { |
520 | ret = PTR_ERR(key_ref); | |
1da177e4 LT |
521 | goto error2; |
522 | } | |
523 | ||
664cceb0 | 524 | ret = key_link(key_ref_to_ptr(keyring_ref), key_ref_to_ptr(key_ref)); |
1da177e4 | 525 | |
664cceb0 | 526 | key_ref_put(key_ref); |
c5b60b5e | 527 | error2: |
664cceb0 | 528 | key_ref_put(keyring_ref); |
c5b60b5e | 529 | error: |
1da177e4 | 530 | return ret; |
a8b17ed0 | 531 | } |
1da177e4 | 532 | |
1da177e4 | 533 | /* |
973c9f4f DH |
534 | * Unlink a key from a keyring. |
535 | * | |
536 | * The keyring must grant the caller Write permission for this to work; the key | |
537 | * itself need not grant the caller anything. If the last link to a key is | |
538 | * removed then that key will be scheduled for destruction. | |
539 | * | |
d3600bcf MZ |
540 | * Keys or keyrings with KEY_FLAG_KEEP set should not be unlinked. |
541 | * | |
973c9f4f | 542 | * If successful, 0 will be returned. |
1da177e4 LT |
543 | */ |
544 | long keyctl_keyring_unlink(key_serial_t id, key_serial_t ringid) | |
545 | { | |
664cceb0 | 546 | key_ref_t keyring_ref, key_ref; |
d3600bcf | 547 | struct key *keyring, *key; |
1da177e4 LT |
548 | long ret; |
549 | ||
f5895943 | 550 | keyring_ref = lookup_user_key(ringid, 0, KEY_NEED_WRITE); |
664cceb0 DH |
551 | if (IS_ERR(keyring_ref)) { |
552 | ret = PTR_ERR(keyring_ref); | |
1da177e4 LT |
553 | goto error; |
554 | } | |
555 | ||
5593122e | 556 | key_ref = lookup_user_key(id, KEY_LOOKUP_FOR_UNLINK, 0); |
664cceb0 DH |
557 | if (IS_ERR(key_ref)) { |
558 | ret = PTR_ERR(key_ref); | |
1da177e4 LT |
559 | goto error2; |
560 | } | |
561 | ||
d3600bcf MZ |
562 | keyring = key_ref_to_ptr(keyring_ref); |
563 | key = key_ref_to_ptr(key_ref); | |
564 | if (test_bit(KEY_FLAG_KEEP, &keyring->flags) && | |
565 | test_bit(KEY_FLAG_KEEP, &key->flags)) | |
566 | ret = -EPERM; | |
567 | else | |
568 | ret = key_unlink(keyring, key); | |
1da177e4 | 569 | |
664cceb0 | 570 | key_ref_put(key_ref); |
c5b60b5e | 571 | error2: |
664cceb0 | 572 | key_ref_put(keyring_ref); |
c5b60b5e | 573 | error: |
1da177e4 | 574 | return ret; |
a8b17ed0 | 575 | } |
1da177e4 | 576 | |
1da177e4 | 577 | /* |
973c9f4f DH |
578 | * Return a description of a key to userspace. |
579 | * | |
580 | * The key must grant the caller View permission for this to work. | |
581 | * | |
582 | * If there's a buffer, we place up to buflen bytes of data into it formatted | |
583 | * in the following way: | |
584 | * | |
1da177e4 | 585 | * type;uid;gid;perm;description<NUL> |
973c9f4f DH |
586 | * |
587 | * If successful, we return the amount of description available, irrespective | |
588 | * of how much we may have copied into the buffer. | |
1da177e4 LT |
589 | */ |
590 | long keyctl_describe_key(key_serial_t keyid, | |
591 | char __user *buffer, | |
592 | size_t buflen) | |
593 | { | |
3e30148c | 594 | struct key *key, *instkey; |
664cceb0 | 595 | key_ref_t key_ref; |
aa9d4437 | 596 | char *infobuf; |
1da177e4 | 597 | long ret; |
aa9d4437 | 598 | int desclen, infolen; |
1da177e4 | 599 | |
f5895943 | 600 | key_ref = lookup_user_key(keyid, KEY_LOOKUP_PARTIAL, KEY_NEED_VIEW); |
664cceb0 | 601 | if (IS_ERR(key_ref)) { |
3e30148c DH |
602 | /* viewing a key under construction is permitted if we have the |
603 | * authorisation token handy */ | |
664cceb0 | 604 | if (PTR_ERR(key_ref) == -EACCES) { |
3e30148c DH |
605 | instkey = key_get_instantiation_authkey(keyid); |
606 | if (!IS_ERR(instkey)) { | |
607 | key_put(instkey); | |
8bbf4976 | 608 | key_ref = lookup_user_key(keyid, |
5593122e DH |
609 | KEY_LOOKUP_PARTIAL, |
610 | 0); | |
664cceb0 | 611 | if (!IS_ERR(key_ref)) |
3e30148c DH |
612 | goto okay; |
613 | } | |
614 | } | |
615 | ||
664cceb0 | 616 | ret = PTR_ERR(key_ref); |
1da177e4 LT |
617 | goto error; |
618 | } | |
619 | ||
3e30148c | 620 | okay: |
664cceb0 | 621 | key = key_ref_to_ptr(key_ref); |
aa9d4437 | 622 | desclen = strlen(key->description); |
664cceb0 | 623 | |
aa9d4437 DH |
624 | /* calculate how much information we're going to return */ |
625 | ret = -ENOMEM; | |
626 | infobuf = kasprintf(GFP_KERNEL, | |
627 | "%s;%d;%d;%08x;", | |
628 | key->type->name, | |
629 | from_kuid_munged(current_user_ns(), key->uid), | |
630 | from_kgid_munged(current_user_ns(), key->gid), | |
631 | key->perm); | |
632 | if (!infobuf) | |
633 | goto error2; | |
634 | infolen = strlen(infobuf); | |
635 | ret = infolen + desclen + 1; | |
1da177e4 LT |
636 | |
637 | /* consider returning the data */ | |
aa9d4437 DH |
638 | if (buffer && buflen >= ret) { |
639 | if (copy_to_user(buffer, infobuf, infolen) != 0 || | |
640 | copy_to_user(buffer + infolen, key->description, | |
641 | desclen + 1) != 0) | |
1da177e4 LT |
642 | ret = -EFAULT; |
643 | } | |
644 | ||
aa9d4437 | 645 | kfree(infobuf); |
c5b60b5e | 646 | error2: |
664cceb0 | 647 | key_ref_put(key_ref); |
c5b60b5e | 648 | error: |
1da177e4 | 649 | return ret; |
a8b17ed0 | 650 | } |
1da177e4 | 651 | |
1da177e4 | 652 | /* |
973c9f4f DH |
653 | * Search the specified keyring and any keyrings it links to for a matching |
654 | * key. Only keyrings that grant the caller Search permission will be searched | |
655 | * (this includes the starting keyring). Only keys with Search permission can | |
656 | * be found. | |
657 | * | |
658 | * If successful, the found key will be linked to the destination keyring if | |
659 | * supplied and the key has Link permission, and the found key ID will be | |
660 | * returned. | |
1da177e4 LT |
661 | */ |
662 | long keyctl_keyring_search(key_serial_t ringid, | |
663 | const char __user *_type, | |
664 | const char __user *_description, | |
665 | key_serial_t destringid) | |
666 | { | |
667 | struct key_type *ktype; | |
664cceb0 | 668 | key_ref_t keyring_ref, key_ref, dest_ref; |
1da177e4 | 669 | char type[32], *description; |
0cb409d9 | 670 | long ret; |
1da177e4 LT |
671 | |
672 | /* pull the type and description into kernel space */ | |
0cb409d9 | 673 | ret = key_get_type_from_user(type, _type, sizeof(type)); |
1da177e4 LT |
674 | if (ret < 0) |
675 | goto error; | |
1da177e4 | 676 | |
aa9d4437 | 677 | description = strndup_user(_description, KEY_MAX_DESC_SIZE); |
0cb409d9 DA |
678 | if (IS_ERR(description)) { |
679 | ret = PTR_ERR(description); | |
1da177e4 | 680 | goto error; |
0cb409d9 | 681 | } |
1da177e4 LT |
682 | |
683 | /* get the keyring at which to begin the search */ | |
f5895943 | 684 | keyring_ref = lookup_user_key(ringid, 0, KEY_NEED_SEARCH); |
664cceb0 DH |
685 | if (IS_ERR(keyring_ref)) { |
686 | ret = PTR_ERR(keyring_ref); | |
1da177e4 LT |
687 | goto error2; |
688 | } | |
689 | ||
690 | /* get the destination keyring if specified */ | |
664cceb0 | 691 | dest_ref = NULL; |
1da177e4 | 692 | if (destringid) { |
5593122e | 693 | dest_ref = lookup_user_key(destringid, KEY_LOOKUP_CREATE, |
f5895943 | 694 | KEY_NEED_WRITE); |
664cceb0 DH |
695 | if (IS_ERR(dest_ref)) { |
696 | ret = PTR_ERR(dest_ref); | |
1da177e4 LT |
697 | goto error3; |
698 | } | |
699 | } | |
700 | ||
701 | /* find the key type */ | |
702 | ktype = key_type_lookup(type); | |
703 | if (IS_ERR(ktype)) { | |
704 | ret = PTR_ERR(ktype); | |
705 | goto error4; | |
706 | } | |
707 | ||
708 | /* do the search */ | |
664cceb0 DH |
709 | key_ref = keyring_search(keyring_ref, ktype, description); |
710 | if (IS_ERR(key_ref)) { | |
711 | ret = PTR_ERR(key_ref); | |
1da177e4 LT |
712 | |
713 | /* treat lack or presence of a negative key the same */ | |
714 | if (ret == -EAGAIN) | |
715 | ret = -ENOKEY; | |
716 | goto error5; | |
717 | } | |
718 | ||
719 | /* link the resulting key to the destination keyring if we can */ | |
664cceb0 | 720 | if (dest_ref) { |
f5895943 | 721 | ret = key_permission(key_ref, KEY_NEED_LINK); |
29db9190 | 722 | if (ret < 0) |
1da177e4 LT |
723 | goto error6; |
724 | ||
664cceb0 | 725 | ret = key_link(key_ref_to_ptr(dest_ref), key_ref_to_ptr(key_ref)); |
1da177e4 LT |
726 | if (ret < 0) |
727 | goto error6; | |
728 | } | |
729 | ||
664cceb0 | 730 | ret = key_ref_to_ptr(key_ref)->serial; |
1da177e4 | 731 | |
c5b60b5e | 732 | error6: |
664cceb0 | 733 | key_ref_put(key_ref); |
c5b60b5e | 734 | error5: |
1da177e4 | 735 | key_type_put(ktype); |
c5b60b5e | 736 | error4: |
664cceb0 | 737 | key_ref_put(dest_ref); |
c5b60b5e | 738 | error3: |
664cceb0 | 739 | key_ref_put(keyring_ref); |
c5b60b5e | 740 | error2: |
1da177e4 | 741 | kfree(description); |
c5b60b5e | 742 | error: |
1da177e4 | 743 | return ret; |
a8b17ed0 | 744 | } |
1da177e4 | 745 | |
1da177e4 | 746 | /* |
973c9f4f DH |
747 | * Read a key's payload. |
748 | * | |
749 | * The key must either grant the caller Read permission, or it must grant the | |
750 | * caller Search permission when searched for from the process keyrings. | |
751 | * | |
752 | * If successful, we place up to buflen bytes of data into the buffer, if one | |
753 | * is provided, and return the amount of data that is available in the key, | |
754 | * irrespective of how much we copied into the buffer. | |
1da177e4 LT |
755 | */ |
756 | long keyctl_read_key(key_serial_t keyid, char __user *buffer, size_t buflen) | |
757 | { | |
664cceb0 DH |
758 | struct key *key; |
759 | key_ref_t key_ref; | |
1da177e4 LT |
760 | long ret; |
761 | ||
762 | /* find the key first */ | |
5593122e | 763 | key_ref = lookup_user_key(keyid, 0, 0); |
664cceb0 DH |
764 | if (IS_ERR(key_ref)) { |
765 | ret = -ENOKEY; | |
766 | goto error; | |
1da177e4 LT |
767 | } |
768 | ||
664cceb0 DH |
769 | key = key_ref_to_ptr(key_ref); |
770 | ||
771 | /* see if we can read it directly */ | |
f5895943 | 772 | ret = key_permission(key_ref, KEY_NEED_READ); |
29db9190 | 773 | if (ret == 0) |
664cceb0 | 774 | goto can_read_key; |
29db9190 DH |
775 | if (ret != -EACCES) |
776 | goto error; | |
664cceb0 DH |
777 | |
778 | /* we can't; see if it's searchable from this process's keyrings | |
779 | * - we automatically take account of the fact that it may be | |
780 | * dangling off an instantiation key | |
781 | */ | |
782 | if (!is_key_possessed(key_ref)) { | |
783 | ret = -EACCES; | |
784 | goto error2; | |
785 | } | |
1da177e4 LT |
786 | |
787 | /* the key is probably readable - now try to read it */ | |
c5b60b5e | 788 | can_read_key: |
b4a1b4f5 DH |
789 | ret = -EOPNOTSUPP; |
790 | if (key->type->read) { | |
791 | /* Read the data with the semaphore held (since we might sleep) | |
792 | * to protect against the key being updated or revoked. | |
793 | */ | |
794 | down_read(&key->sem); | |
795 | ret = key_validate(key); | |
796 | if (ret == 0) | |
1da177e4 | 797 | ret = key->type->read(key, buffer, buflen); |
b4a1b4f5 | 798 | up_read(&key->sem); |
1da177e4 LT |
799 | } |
800 | ||
c5b60b5e | 801 | error2: |
1da177e4 | 802 | key_put(key); |
c5b60b5e | 803 | error: |
1da177e4 | 804 | return ret; |
a8b17ed0 | 805 | } |
1da177e4 | 806 | |
1da177e4 | 807 | /* |
973c9f4f DH |
808 | * Change the ownership of a key |
809 | * | |
810 | * The key must grant the caller Setattr permission for this to work, though | |
811 | * the key need not be fully instantiated yet. For the UID to be changed, or | |
812 | * for the GID to be changed to a group the caller is not a member of, the | |
813 | * caller must have sysadmin capability. If either uid or gid is -1 then that | |
814 | * attribute is not changed. | |
815 | * | |
816 | * If the UID is to be changed, the new user must have sufficient quota to | |
817 | * accept the key. The quota deduction will be removed from the old user to | |
818 | * the new user should the attribute be changed. | |
819 | * | |
820 | * If successful, 0 will be returned. | |
1da177e4 | 821 | */ |
9a56c2db | 822 | long keyctl_chown_key(key_serial_t id, uid_t user, gid_t group) |
1da177e4 | 823 | { |
5801649d | 824 | struct key_user *newowner, *zapowner = NULL; |
1da177e4 | 825 | struct key *key; |
664cceb0 | 826 | key_ref_t key_ref; |
1da177e4 | 827 | long ret; |
9a56c2db EB |
828 | kuid_t uid; |
829 | kgid_t gid; | |
830 | ||
831 | uid = make_kuid(current_user_ns(), user); | |
832 | gid = make_kgid(current_user_ns(), group); | |
833 | ret = -EINVAL; | |
834 | if ((user != (uid_t) -1) && !uid_valid(uid)) | |
835 | goto error; | |
836 | if ((group != (gid_t) -1) && !gid_valid(gid)) | |
837 | goto error; | |
1da177e4 LT |
838 | |
839 | ret = 0; | |
9a56c2db | 840 | if (user == (uid_t) -1 && group == (gid_t) -1) |
1da177e4 LT |
841 | goto error; |
842 | ||
5593122e | 843 | key_ref = lookup_user_key(id, KEY_LOOKUP_CREATE | KEY_LOOKUP_PARTIAL, |
f5895943 | 844 | KEY_NEED_SETATTR); |
664cceb0 DH |
845 | if (IS_ERR(key_ref)) { |
846 | ret = PTR_ERR(key_ref); | |
1da177e4 LT |
847 | goto error; |
848 | } | |
849 | ||
664cceb0 DH |
850 | key = key_ref_to_ptr(key_ref); |
851 | ||
1da177e4 LT |
852 | /* make the changes with the locks held to prevent chown/chown races */ |
853 | ret = -EACCES; | |
854 | down_write(&key->sem); | |
1da177e4 LT |
855 | |
856 | if (!capable(CAP_SYS_ADMIN)) { | |
857 | /* only the sysadmin can chown a key to some other UID */ | |
9a56c2db | 858 | if (user != (uid_t) -1 && !uid_eq(key->uid, uid)) |
5801649d | 859 | goto error_put; |
1da177e4 LT |
860 | |
861 | /* only the sysadmin can set the key's GID to a group other | |
862 | * than one of those that the current process subscribes to */ | |
9a56c2db | 863 | if (group != (gid_t) -1 && !gid_eq(gid, key->gid) && !in_group_p(gid)) |
5801649d | 864 | goto error_put; |
1da177e4 LT |
865 | } |
866 | ||
5801649d | 867 | /* change the UID */ |
9a56c2db | 868 | if (user != (uid_t) -1 && !uid_eq(uid, key->uid)) { |
5801649d | 869 | ret = -ENOMEM; |
9a56c2db | 870 | newowner = key_user_lookup(uid); |
5801649d FT |
871 | if (!newowner) |
872 | goto error_put; | |
873 | ||
874 | /* transfer the quota burden to the new user */ | |
875 | if (test_bit(KEY_FLAG_IN_QUOTA, &key->flags)) { | |
9a56c2db | 876 | unsigned maxkeys = uid_eq(uid, GLOBAL_ROOT_UID) ? |
0b77f5bf | 877 | key_quota_root_maxkeys : key_quota_maxkeys; |
9a56c2db | 878 | unsigned maxbytes = uid_eq(uid, GLOBAL_ROOT_UID) ? |
0b77f5bf DH |
879 | key_quota_root_maxbytes : key_quota_maxbytes; |
880 | ||
5801649d | 881 | spin_lock(&newowner->lock); |
0b77f5bf DH |
882 | if (newowner->qnkeys + 1 >= maxkeys || |
883 | newowner->qnbytes + key->quotalen >= maxbytes || | |
884 | newowner->qnbytes + key->quotalen < | |
885 | newowner->qnbytes) | |
5801649d FT |
886 | goto quota_overrun; |
887 | ||
888 | newowner->qnkeys++; | |
889 | newowner->qnbytes += key->quotalen; | |
890 | spin_unlock(&newowner->lock); | |
891 | ||
892 | spin_lock(&key->user->lock); | |
893 | key->user->qnkeys--; | |
894 | key->user->qnbytes -= key->quotalen; | |
895 | spin_unlock(&key->user->lock); | |
896 | } | |
897 | ||
898 | atomic_dec(&key->user->nkeys); | |
899 | atomic_inc(&newowner->nkeys); | |
900 | ||
901 | if (test_bit(KEY_FLAG_INSTANTIATED, &key->flags)) { | |
902 | atomic_dec(&key->user->nikeys); | |
903 | atomic_inc(&newowner->nikeys); | |
904 | } | |
905 | ||
906 | zapowner = key->user; | |
907 | key->user = newowner; | |
908 | key->uid = uid; | |
1da177e4 LT |
909 | } |
910 | ||
911 | /* change the GID */ | |
9a56c2db | 912 | if (group != (gid_t) -1) |
1da177e4 LT |
913 | key->gid = gid; |
914 | ||
915 | ret = 0; | |
916 | ||
5801649d | 917 | error_put: |
1da177e4 LT |
918 | up_write(&key->sem); |
919 | key_put(key); | |
5801649d FT |
920 | if (zapowner) |
921 | key_user_put(zapowner); | |
922 | error: | |
1da177e4 LT |
923 | return ret; |
924 | ||
5801649d FT |
925 | quota_overrun: |
926 | spin_unlock(&newowner->lock); | |
927 | zapowner = newowner; | |
928 | ret = -EDQUOT; | |
929 | goto error_put; | |
a8b17ed0 | 930 | } |
5801649d | 931 | |
1da177e4 | 932 | /* |
973c9f4f DH |
933 | * Change the permission mask on a key. |
934 | * | |
935 | * The key must grant the caller Setattr permission for this to work, though | |
936 | * the key need not be fully instantiated yet. If the caller does not have | |
937 | * sysadmin capability, it may only change the permission on keys that it owns. | |
1da177e4 LT |
938 | */ |
939 | long keyctl_setperm_key(key_serial_t id, key_perm_t perm) | |
940 | { | |
941 | struct key *key; | |
664cceb0 | 942 | key_ref_t key_ref; |
1da177e4 LT |
943 | long ret; |
944 | ||
945 | ret = -EINVAL; | |
664cceb0 | 946 | if (perm & ~(KEY_POS_ALL | KEY_USR_ALL | KEY_GRP_ALL | KEY_OTH_ALL)) |
1da177e4 LT |
947 | goto error; |
948 | ||
5593122e | 949 | key_ref = lookup_user_key(id, KEY_LOOKUP_CREATE | KEY_LOOKUP_PARTIAL, |
f5895943 | 950 | KEY_NEED_SETATTR); |
664cceb0 DH |
951 | if (IS_ERR(key_ref)) { |
952 | ret = PTR_ERR(key_ref); | |
1da177e4 LT |
953 | goto error; |
954 | } | |
955 | ||
664cceb0 DH |
956 | key = key_ref_to_ptr(key_ref); |
957 | ||
76d8aeab | 958 | /* make the changes with the locks held to prevent chown/chmod races */ |
1da177e4 LT |
959 | ret = -EACCES; |
960 | down_write(&key->sem); | |
1da177e4 | 961 | |
76d8aeab | 962 | /* if we're not the sysadmin, we can only change a key that we own */ |
9a56c2db | 963 | if (capable(CAP_SYS_ADMIN) || uid_eq(key->uid, current_fsuid())) { |
76d8aeab DH |
964 | key->perm = perm; |
965 | ret = 0; | |
966 | } | |
1da177e4 | 967 | |
1da177e4 LT |
968 | up_write(&key->sem); |
969 | key_put(key); | |
76d8aeab | 970 | error: |
1da177e4 | 971 | return ret; |
a8b17ed0 | 972 | } |
1da177e4 | 973 | |
8bbf4976 | 974 | /* |
973c9f4f DH |
975 | * Get the destination keyring for instantiation and check that the caller has |
976 | * Write permission on it. | |
8bbf4976 DH |
977 | */ |
978 | static long get_instantiation_keyring(key_serial_t ringid, | |
979 | struct request_key_auth *rka, | |
980 | struct key **_dest_keyring) | |
981 | { | |
982 | key_ref_t dkref; | |
983 | ||
eca1bf5b DH |
984 | *_dest_keyring = NULL; |
985 | ||
8bbf4976 | 986 | /* just return a NULL pointer if we weren't asked to make a link */ |
eca1bf5b | 987 | if (ringid == 0) |
8bbf4976 | 988 | return 0; |
8bbf4976 DH |
989 | |
990 | /* if a specific keyring is nominated by ID, then use that */ | |
991 | if (ringid > 0) { | |
f5895943 | 992 | dkref = lookup_user_key(ringid, KEY_LOOKUP_CREATE, KEY_NEED_WRITE); |
8bbf4976 DH |
993 | if (IS_ERR(dkref)) |
994 | return PTR_ERR(dkref); | |
995 | *_dest_keyring = key_ref_to_ptr(dkref); | |
996 | return 0; | |
997 | } | |
998 | ||
999 | if (ringid == KEY_SPEC_REQKEY_AUTH_KEY) | |
1000 | return -EINVAL; | |
1001 | ||
1002 | /* otherwise specify the destination keyring recorded in the | |
1003 | * authorisation key (any KEY_SPEC_*_KEYRING) */ | |
1004 | if (ringid >= KEY_SPEC_REQUESTOR_KEYRING) { | |
21279cfa | 1005 | *_dest_keyring = key_get(rka->dest_keyring); |
8bbf4976 DH |
1006 | return 0; |
1007 | } | |
1008 | ||
1009 | return -ENOKEY; | |
1010 | } | |
1011 | ||
d84f4f99 | 1012 | /* |
973c9f4f | 1013 | * Change the request_key authorisation key on the current process. |
d84f4f99 DH |
1014 | */ |
1015 | static int keyctl_change_reqkey_auth(struct key *key) | |
1016 | { | |
1017 | struct cred *new; | |
1018 | ||
1019 | new = prepare_creds(); | |
1020 | if (!new) | |
1021 | return -ENOMEM; | |
1022 | ||
1023 | key_put(new->request_key_auth); | |
1024 | new->request_key_auth = key_get(key); | |
1025 | ||
1026 | return commit_creds(new); | |
1027 | } | |
1028 | ||
1da177e4 | 1029 | /* |
973c9f4f DH |
1030 | * Instantiate a key with the specified payload and link the key into the |
1031 | * destination keyring if one is given. | |
1032 | * | |
1033 | * The caller must have the appropriate instantiation permit set for this to | |
1034 | * work (see keyctl_assume_authority). No other permissions are required. | |
1035 | * | |
1036 | * If successful, 0 will be returned. | |
1da177e4 | 1037 | */ |
ee009e4a | 1038 | long keyctl_instantiate_key_common(key_serial_t id, |
b353a1f7 | 1039 | struct iov_iter *from, |
ee009e4a | 1040 | key_serial_t ringid) |
1da177e4 | 1041 | { |
d84f4f99 | 1042 | const struct cred *cred = current_cred(); |
3e30148c | 1043 | struct request_key_auth *rka; |
8bbf4976 | 1044 | struct key *instkey, *dest_keyring; |
b353a1f7 | 1045 | size_t plen = from ? iov_iter_count(from) : 0; |
1da177e4 LT |
1046 | void *payload; |
1047 | long ret; | |
1048 | ||
d84f4f99 DH |
1049 | kenter("%d,,%zu,%d", id, plen, ringid); |
1050 | ||
b353a1f7 AV |
1051 | if (!plen) |
1052 | from = NULL; | |
1053 | ||
1da177e4 | 1054 | ret = -EINVAL; |
38bbca6b | 1055 | if (plen > 1024 * 1024 - 1) |
1da177e4 LT |
1056 | goto error; |
1057 | ||
b5f545c8 DH |
1058 | /* the appropriate instantiation authorisation key must have been |
1059 | * assumed before calling this */ | |
1060 | ret = -EPERM; | |
d84f4f99 | 1061 | instkey = cred->request_key_auth; |
b5f545c8 DH |
1062 | if (!instkey) |
1063 | goto error; | |
1064 | ||
146aa8b1 | 1065 | rka = instkey->payload.data[0]; |
b5f545c8 DH |
1066 | if (rka->target_key->serial != id) |
1067 | goto error; | |
1068 | ||
1da177e4 LT |
1069 | /* pull the payload in if one was supplied */ |
1070 | payload = NULL; | |
1071 | ||
b353a1f7 | 1072 | if (from) { |
1da177e4 LT |
1073 | ret = -ENOMEM; |
1074 | payload = kmalloc(plen, GFP_KERNEL); | |
38bbca6b DH |
1075 | if (!payload) { |
1076 | if (plen <= PAGE_SIZE) | |
1077 | goto error; | |
38bbca6b DH |
1078 | payload = vmalloc(plen); |
1079 | if (!payload) | |
1080 | goto error; | |
1081 | } | |
1da177e4 | 1082 | |
b353a1f7 | 1083 | ret = -EFAULT; |
cbbd26b8 | 1084 | if (!copy_from_iter_full(payload, plen, from)) |
1da177e4 LT |
1085 | goto error2; |
1086 | } | |
1087 | ||
3e30148c DH |
1088 | /* find the destination keyring amongst those belonging to the |
1089 | * requesting task */ | |
8bbf4976 DH |
1090 | ret = get_instantiation_keyring(ringid, rka, &dest_keyring); |
1091 | if (ret < 0) | |
1092 | goto error2; | |
1da177e4 LT |
1093 | |
1094 | /* instantiate the key and link it into a keyring */ | |
3e30148c | 1095 | ret = key_instantiate_and_link(rka->target_key, payload, plen, |
8bbf4976 | 1096 | dest_keyring, instkey); |
1da177e4 | 1097 | |
8bbf4976 | 1098 | key_put(dest_keyring); |
b5f545c8 DH |
1099 | |
1100 | /* discard the assumed authority if it's just been disabled by | |
1101 | * instantiation of the key */ | |
d84f4f99 DH |
1102 | if (ret == 0) |
1103 | keyctl_change_reqkey_auth(NULL); | |
b5f545c8 DH |
1104 | |
1105 | error2: | |
b353a1f7 | 1106 | kvfree(payload); |
b5f545c8 | 1107 | error: |
1da177e4 | 1108 | return ret; |
a8b17ed0 | 1109 | } |
1da177e4 | 1110 | |
ee009e4a DH |
1111 | /* |
1112 | * Instantiate a key with the specified payload and link the key into the | |
1113 | * destination keyring if one is given. | |
1114 | * | |
1115 | * The caller must have the appropriate instantiation permit set for this to | |
1116 | * work (see keyctl_assume_authority). No other permissions are required. | |
1117 | * | |
1118 | * If successful, 0 will be returned. | |
1119 | */ | |
1120 | long keyctl_instantiate_key(key_serial_t id, | |
1121 | const void __user *_payload, | |
1122 | size_t plen, | |
1123 | key_serial_t ringid) | |
1124 | { | |
1125 | if (_payload && plen) { | |
b353a1f7 AV |
1126 | struct iovec iov; |
1127 | struct iov_iter from; | |
1128 | int ret; | |
ee009e4a | 1129 | |
b353a1f7 AV |
1130 | ret = import_single_range(WRITE, (void __user *)_payload, plen, |
1131 | &iov, &from); | |
1132 | if (unlikely(ret)) | |
1133 | return ret; | |
1134 | ||
1135 | return keyctl_instantiate_key_common(id, &from, ringid); | |
ee009e4a DH |
1136 | } |
1137 | ||
b353a1f7 | 1138 | return keyctl_instantiate_key_common(id, NULL, ringid); |
ee009e4a DH |
1139 | } |
1140 | ||
1141 | /* | |
1142 | * Instantiate a key with the specified multipart payload and link the key into | |
1143 | * the destination keyring if one is given. | |
1144 | * | |
1145 | * The caller must have the appropriate instantiation permit set for this to | |
1146 | * work (see keyctl_assume_authority). No other permissions are required. | |
1147 | * | |
1148 | * If successful, 0 will be returned. | |
1149 | */ | |
1150 | long keyctl_instantiate_key_iov(key_serial_t id, | |
1151 | const struct iovec __user *_payload_iov, | |
1152 | unsigned ioc, | |
1153 | key_serial_t ringid) | |
1154 | { | |
1155 | struct iovec iovstack[UIO_FASTIOV], *iov = iovstack; | |
b353a1f7 | 1156 | struct iov_iter from; |
ee009e4a DH |
1157 | long ret; |
1158 | ||
b353a1f7 AV |
1159 | if (!_payload_iov) |
1160 | ioc = 0; | |
ee009e4a | 1161 | |
b353a1f7 AV |
1162 | ret = import_iovec(WRITE, _payload_iov, ioc, |
1163 | ARRAY_SIZE(iovstack), &iov, &from); | |
ee009e4a | 1164 | if (ret < 0) |
b353a1f7 AV |
1165 | return ret; |
1166 | ret = keyctl_instantiate_key_common(id, &from, ringid); | |
1167 | kfree(iov); | |
ee009e4a | 1168 | return ret; |
ee009e4a DH |
1169 | } |
1170 | ||
1da177e4 | 1171 | /* |
973c9f4f DH |
1172 | * Negatively instantiate the key with the given timeout (in seconds) and link |
1173 | * the key into the destination keyring if one is given. | |
1174 | * | |
1175 | * The caller must have the appropriate instantiation permit set for this to | |
1176 | * work (see keyctl_assume_authority). No other permissions are required. | |
1177 | * | |
1178 | * The key and any links to the key will be automatically garbage collected | |
1179 | * after the timeout expires. | |
1180 | * | |
1181 | * Negative keys are used to rate limit repeated request_key() calls by causing | |
1182 | * them to return -ENOKEY until the negative key expires. | |
1183 | * | |
1184 | * If successful, 0 will be returned. | |
1da177e4 LT |
1185 | */ |
1186 | long keyctl_negate_key(key_serial_t id, unsigned timeout, key_serial_t ringid) | |
fdd1b945 DH |
1187 | { |
1188 | return keyctl_reject_key(id, timeout, ENOKEY, ringid); | |
1189 | } | |
1190 | ||
1191 | /* | |
1192 | * Negatively instantiate the key with the given timeout (in seconds) and error | |
1193 | * code and link the key into the destination keyring if one is given. | |
1194 | * | |
1195 | * The caller must have the appropriate instantiation permit set for this to | |
1196 | * work (see keyctl_assume_authority). No other permissions are required. | |
1197 | * | |
1198 | * The key and any links to the key will be automatically garbage collected | |
1199 | * after the timeout expires. | |
1200 | * | |
1201 | * Negative keys are used to rate limit repeated request_key() calls by causing | |
1202 | * them to return the specified error code until the negative key expires. | |
1203 | * | |
1204 | * If successful, 0 will be returned. | |
1205 | */ | |
1206 | long keyctl_reject_key(key_serial_t id, unsigned timeout, unsigned error, | |
1207 | key_serial_t ringid) | |
1da177e4 | 1208 | { |
d84f4f99 | 1209 | const struct cred *cred = current_cred(); |
3e30148c | 1210 | struct request_key_auth *rka; |
8bbf4976 | 1211 | struct key *instkey, *dest_keyring; |
1da177e4 LT |
1212 | long ret; |
1213 | ||
fdd1b945 DH |
1214 | kenter("%d,%u,%u,%d", id, timeout, error, ringid); |
1215 | ||
1216 | /* must be a valid error code and mustn't be a kernel special */ | |
1217 | if (error <= 0 || | |
1218 | error >= MAX_ERRNO || | |
1219 | error == ERESTARTSYS || | |
1220 | error == ERESTARTNOINTR || | |
1221 | error == ERESTARTNOHAND || | |
1222 | error == ERESTART_RESTARTBLOCK) | |
1223 | return -EINVAL; | |
d84f4f99 | 1224 | |
b5f545c8 DH |
1225 | /* the appropriate instantiation authorisation key must have been |
1226 | * assumed before calling this */ | |
1227 | ret = -EPERM; | |
d84f4f99 | 1228 | instkey = cred->request_key_auth; |
b5f545c8 | 1229 | if (!instkey) |
1da177e4 | 1230 | goto error; |
1da177e4 | 1231 | |
146aa8b1 | 1232 | rka = instkey->payload.data[0]; |
b5f545c8 DH |
1233 | if (rka->target_key->serial != id) |
1234 | goto error; | |
3e30148c | 1235 | |
1da177e4 LT |
1236 | /* find the destination keyring if present (which must also be |
1237 | * writable) */ | |
8bbf4976 DH |
1238 | ret = get_instantiation_keyring(ringid, rka, &dest_keyring); |
1239 | if (ret < 0) | |
1240 | goto error; | |
1da177e4 LT |
1241 | |
1242 | /* instantiate the key and link it into a keyring */ | |
fdd1b945 | 1243 | ret = key_reject_and_link(rka->target_key, timeout, error, |
8bbf4976 | 1244 | dest_keyring, instkey); |
1da177e4 | 1245 | |
8bbf4976 | 1246 | key_put(dest_keyring); |
b5f545c8 DH |
1247 | |
1248 | /* discard the assumed authority if it's just been disabled by | |
1249 | * instantiation of the key */ | |
d84f4f99 DH |
1250 | if (ret == 0) |
1251 | keyctl_change_reqkey_auth(NULL); | |
b5f545c8 DH |
1252 | |
1253 | error: | |
1da177e4 | 1254 | return ret; |
a8b17ed0 | 1255 | } |
1da177e4 | 1256 | |
3e30148c | 1257 | /* |
973c9f4f DH |
1258 | * Read or set the default keyring in which request_key() will cache keys and |
1259 | * return the old setting. | |
1260 | * | |
c9f838d1 EB |
1261 | * If a thread or process keyring is specified then it will be created if it |
1262 | * doesn't yet exist. The old setting will be returned if successful. | |
3e30148c DH |
1263 | */ |
1264 | long keyctl_set_reqkey_keyring(int reqkey_defl) | |
1265 | { | |
d84f4f99 DH |
1266 | struct cred *new; |
1267 | int ret, old_setting; | |
1268 | ||
1269 | old_setting = current_cred_xxx(jit_keyring); | |
1270 | ||
1271 | if (reqkey_defl == KEY_REQKEY_DEFL_NO_CHANGE) | |
1272 | return old_setting; | |
1273 | ||
1274 | new = prepare_creds(); | |
1275 | if (!new) | |
1276 | return -ENOMEM; | |
3e30148c DH |
1277 | |
1278 | switch (reqkey_defl) { | |
1279 | case KEY_REQKEY_DEFL_THREAD_KEYRING: | |
d84f4f99 | 1280 | ret = install_thread_keyring_to_cred(new); |
3e30148c | 1281 | if (ret < 0) |
d84f4f99 | 1282 | goto error; |
3e30148c DH |
1283 | goto set; |
1284 | ||
1285 | case KEY_REQKEY_DEFL_PROCESS_KEYRING: | |
d84f4f99 | 1286 | ret = install_process_keyring_to_cred(new); |
c9f838d1 EB |
1287 | if (ret < 0) |
1288 | goto error; | |
d84f4f99 | 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 | * | |
d3600bcf MZ |
1324 | * Keys with KEY_FLAG_KEEP set should not be timed out. |
1325 | * | |
973c9f4f | 1326 | * If successful, 0 is returned. |
017679c4 DH |
1327 | */ |
1328 | long keyctl_set_timeout(key_serial_t id, unsigned timeout) | |
1329 | { | |
9156235b | 1330 | struct key *key, *instkey; |
017679c4 | 1331 | key_ref_t key_ref; |
017679c4 DH |
1332 | long ret; |
1333 | ||
5593122e | 1334 | key_ref = lookup_user_key(id, KEY_LOOKUP_CREATE | KEY_LOOKUP_PARTIAL, |
f5895943 | 1335 | KEY_NEED_SETATTR); |
017679c4 | 1336 | if (IS_ERR(key_ref)) { |
9156235b DH |
1337 | /* setting the timeout on a key under construction is permitted |
1338 | * if we have the authorisation token handy */ | |
1339 | if (PTR_ERR(key_ref) == -EACCES) { | |
1340 | instkey = key_get_instantiation_authkey(id); | |
1341 | if (!IS_ERR(instkey)) { | |
1342 | key_put(instkey); | |
1343 | key_ref = lookup_user_key(id, | |
1344 | KEY_LOOKUP_PARTIAL, | |
1345 | 0); | |
1346 | if (!IS_ERR(key_ref)) | |
1347 | goto okay; | |
1348 | } | |
1349 | } | |
1350 | ||
017679c4 DH |
1351 | ret = PTR_ERR(key_ref); |
1352 | goto error; | |
1353 | } | |
1354 | ||
9156235b | 1355 | okay: |
017679c4 | 1356 | key = key_ref_to_ptr(key_ref); |
1d6d167c | 1357 | ret = 0; |
d3600bcf MZ |
1358 | if (test_bit(KEY_FLAG_KEEP, &key->flags)) |
1359 | ret = -EPERM; | |
1d6d167c | 1360 | else |
d3600bcf | 1361 | key_set_timeout(key, timeout); |
017679c4 DH |
1362 | key_put(key); |
1363 | ||
017679c4 DH |
1364 | error: |
1365 | return ret; | |
a8b17ed0 | 1366 | } |
017679c4 | 1367 | |
b5f545c8 | 1368 | /* |
973c9f4f DH |
1369 | * Assume (or clear) the authority to instantiate the specified key. |
1370 | * | |
1371 | * This sets the authoritative token currently in force for key instantiation. | |
1372 | * This must be done for a key to be instantiated. It has the effect of making | |
1373 | * available all the keys from the caller of the request_key() that created a | |
1374 | * key to request_key() calls made by the caller of this function. | |
1375 | * | |
1376 | * The caller must have the instantiation key in their process keyrings with a | |
1377 | * Search permission grant available to the caller. | |
1378 | * | |
1379 | * If the ID given is 0, then the setting will be cleared and 0 returned. | |
1380 | * | |
1381 | * If the ID given has a matching an authorisation key, then that key will be | |
1382 | * set and its ID will be returned. The authorisation key can be read to get | |
1383 | * the callout information passed to request_key(). | |
b5f545c8 DH |
1384 | */ |
1385 | long keyctl_assume_authority(key_serial_t id) | |
1386 | { | |
1387 | struct key *authkey; | |
1388 | long ret; | |
1389 | ||
1390 | /* special key IDs aren't permitted */ | |
1391 | ret = -EINVAL; | |
1392 | if (id < 0) | |
1393 | goto error; | |
1394 | ||
1395 | /* we divest ourselves of authority if given an ID of 0 */ | |
1396 | if (id == 0) { | |
d84f4f99 | 1397 | ret = keyctl_change_reqkey_auth(NULL); |
b5f545c8 DH |
1398 | goto error; |
1399 | } | |
1400 | ||
1401 | /* attempt to assume the authority temporarily granted to us whilst we | |
1402 | * instantiate the specified key | |
1403 | * - the authorisation key must be in the current task's keyrings | |
1404 | * somewhere | |
1405 | */ | |
1406 | authkey = key_get_instantiation_authkey(id); | |
1407 | if (IS_ERR(authkey)) { | |
1408 | ret = PTR_ERR(authkey); | |
1409 | goto error; | |
1410 | } | |
1411 | ||
d84f4f99 DH |
1412 | ret = keyctl_change_reqkey_auth(authkey); |
1413 | if (ret < 0) | |
1414 | goto error; | |
1415 | key_put(authkey); | |
b5f545c8 | 1416 | |
d84f4f99 | 1417 | ret = authkey->serial; |
b5f545c8 DH |
1418 | error: |
1419 | return ret; | |
a8b17ed0 | 1420 | } |
b5f545c8 | 1421 | |
70a5bb72 | 1422 | /* |
973c9f4f DH |
1423 | * Get a key's the LSM security label. |
1424 | * | |
1425 | * The key must grant the caller View permission for this to work. | |
1426 | * | |
1427 | * If there's a buffer, then up to buflen bytes of data will be placed into it. | |
1428 | * | |
1429 | * If successful, the amount of information available will be returned, | |
1430 | * irrespective of how much was copied (including the terminal NUL). | |
70a5bb72 DH |
1431 | */ |
1432 | long keyctl_get_security(key_serial_t keyid, | |
1433 | char __user *buffer, | |
1434 | size_t buflen) | |
1435 | { | |
1436 | struct key *key, *instkey; | |
1437 | key_ref_t key_ref; | |
1438 | char *context; | |
1439 | long ret; | |
1440 | ||
f5895943 | 1441 | key_ref = lookup_user_key(keyid, KEY_LOOKUP_PARTIAL, KEY_NEED_VIEW); |
70a5bb72 DH |
1442 | if (IS_ERR(key_ref)) { |
1443 | if (PTR_ERR(key_ref) != -EACCES) | |
1444 | return PTR_ERR(key_ref); | |
1445 | ||
1446 | /* viewing a key under construction is also permitted if we | |
1447 | * have the authorisation token handy */ | |
1448 | instkey = key_get_instantiation_authkey(keyid); | |
1449 | if (IS_ERR(instkey)) | |
fa1cc7b5 | 1450 | return PTR_ERR(instkey); |
70a5bb72 DH |
1451 | key_put(instkey); |
1452 | ||
5593122e | 1453 | key_ref = lookup_user_key(keyid, KEY_LOOKUP_PARTIAL, 0); |
70a5bb72 DH |
1454 | if (IS_ERR(key_ref)) |
1455 | return PTR_ERR(key_ref); | |
1456 | } | |
1457 | ||
1458 | key = key_ref_to_ptr(key_ref); | |
1459 | ret = security_key_getsecurity(key, &context); | |
1460 | if (ret == 0) { | |
1461 | /* if no information was returned, give userspace an empty | |
1462 | * string */ | |
1463 | ret = 1; | |
1464 | if (buffer && buflen > 0 && | |
1465 | copy_to_user(buffer, "", 1) != 0) | |
1466 | ret = -EFAULT; | |
1467 | } else if (ret > 0) { | |
1468 | /* return as much data as there's room for */ | |
1469 | if (buffer && buflen > 0) { | |
1470 | if (buflen > ret) | |
1471 | buflen = ret; | |
1472 | ||
1473 | if (copy_to_user(buffer, context, buflen) != 0) | |
1474 | ret = -EFAULT; | |
1475 | } | |
1476 | ||
1477 | kfree(context); | |
1478 | } | |
1479 | ||
1480 | key_ref_put(key_ref); | |
1481 | return ret; | |
1482 | } | |
1483 | ||
ee18d64c | 1484 | /* |
973c9f4f DH |
1485 | * Attempt to install the calling process's session keyring on the process's |
1486 | * parent process. | |
1487 | * | |
1488 | * The keyring must exist and must grant the caller LINK permission, and the | |
1489 | * parent process must be single-threaded and must have the same effective | |
1490 | * ownership as this process and mustn't be SUID/SGID. | |
1491 | * | |
1492 | * The keyring will be emplaced on the parent when it next resumes userspace. | |
1493 | * | |
1494 | * If successful, 0 will be returned. | |
ee18d64c DH |
1495 | */ |
1496 | long keyctl_session_to_parent(void) | |
1497 | { | |
1498 | struct task_struct *me, *parent; | |
1499 | const struct cred *mycred, *pcred; | |
67d12145 | 1500 | struct callback_head *newwork, *oldwork; |
ee18d64c | 1501 | key_ref_t keyring_r; |
413cd3d9 | 1502 | struct cred *cred; |
ee18d64c DH |
1503 | int ret; |
1504 | ||
f5895943 | 1505 | keyring_r = lookup_user_key(KEY_SPEC_SESSION_KEYRING, 0, KEY_NEED_LINK); |
ee18d64c DH |
1506 | if (IS_ERR(keyring_r)) |
1507 | return PTR_ERR(keyring_r); | |
1508 | ||
413cd3d9 | 1509 | ret = -ENOMEM; |
413cd3d9 | 1510 | |
ee18d64c DH |
1511 | /* our parent is going to need a new cred struct, a new tgcred struct |
1512 | * and new security data, so we allocate them here to prevent ENOMEM in | |
1513 | * our parent */ | |
ee18d64c DH |
1514 | cred = cred_alloc_blank(); |
1515 | if (!cred) | |
67d12145 AV |
1516 | goto error_keyring; |
1517 | newwork = &cred->rcu; | |
ee18d64c | 1518 | |
3a50597d DH |
1519 | cred->session_keyring = key_ref_to_ptr(keyring_r); |
1520 | keyring_r = NULL; | |
67d12145 | 1521 | init_task_work(newwork, key_change_session_keyring); |
ee18d64c DH |
1522 | |
1523 | me = current; | |
9d1ac65a | 1524 | rcu_read_lock(); |
ee18d64c DH |
1525 | write_lock_irq(&tasklist_lock); |
1526 | ||
ee18d64c | 1527 | ret = -EPERM; |
413cd3d9 ON |
1528 | oldwork = NULL; |
1529 | parent = me->real_parent; | |
ee18d64c DH |
1530 | |
1531 | /* the parent mustn't be init and mustn't be a kernel thread */ | |
1532 | if (parent->pid <= 1 || !parent->mm) | |
413cd3d9 | 1533 | goto unlock; |
ee18d64c DH |
1534 | |
1535 | /* the parent must be single threaded */ | |
dd98acf7 | 1536 | if (!thread_group_empty(parent)) |
413cd3d9 | 1537 | goto unlock; |
ee18d64c DH |
1538 | |
1539 | /* the parent and the child must have different session keyrings or | |
1540 | * there's no point */ | |
1541 | mycred = current_cred(); | |
1542 | pcred = __task_cred(parent); | |
1543 | if (mycred == pcred || | |
3a50597d | 1544 | mycred->session_keyring == pcred->session_keyring) { |
413cd3d9 ON |
1545 | ret = 0; |
1546 | goto unlock; | |
1547 | } | |
ee18d64c DH |
1548 | |
1549 | /* the parent must have the same effective ownership and mustn't be | |
1550 | * SUID/SGID */ | |
9a56c2db EB |
1551 | if (!uid_eq(pcred->uid, mycred->euid) || |
1552 | !uid_eq(pcred->euid, mycred->euid) || | |
1553 | !uid_eq(pcred->suid, mycred->euid) || | |
1554 | !gid_eq(pcred->gid, mycred->egid) || | |
1555 | !gid_eq(pcred->egid, mycred->egid) || | |
1556 | !gid_eq(pcred->sgid, mycred->egid)) | |
413cd3d9 | 1557 | goto unlock; |
ee18d64c DH |
1558 | |
1559 | /* the keyrings must have the same UID */ | |
3a50597d | 1560 | if ((pcred->session_keyring && |
2a74dbb9 LT |
1561 | !uid_eq(pcred->session_keyring->uid, mycred->euid)) || |
1562 | !uid_eq(mycred->session_keyring->uid, mycred->euid)) | |
413cd3d9 | 1563 | goto unlock; |
ee18d64c | 1564 | |
413cd3d9 ON |
1565 | /* cancel an already pending keyring replacement */ |
1566 | oldwork = task_work_cancel(parent, key_change_session_keyring); | |
ee18d64c DH |
1567 | |
1568 | /* the replacement session keyring is applied just prior to userspace | |
1569 | * restarting */ | |
67d12145 | 1570 | ret = task_work_add(parent, newwork, true); |
413cd3d9 ON |
1571 | if (!ret) |
1572 | newwork = NULL; | |
1573 | unlock: | |
ee18d64c | 1574 | write_unlock_irq(&tasklist_lock); |
9d1ac65a | 1575 | rcu_read_unlock(); |
67d12145 AV |
1576 | if (oldwork) |
1577 | put_cred(container_of(oldwork, struct cred, rcu)); | |
1578 | if (newwork) | |
1579 | put_cred(cred); | |
ee18d64c DH |
1580 | return ret; |
1581 | ||
1582 | error_keyring: | |
1583 | key_ref_put(keyring_r); | |
1584 | return ret; | |
1585 | } | |
1586 | ||
1da177e4 | 1587 | /* |
973c9f4f | 1588 | * The key control system call |
1da177e4 | 1589 | */ |
938bb9f5 HC |
1590 | SYSCALL_DEFINE5(keyctl, int, option, unsigned long, arg2, unsigned long, arg3, |
1591 | unsigned long, arg4, unsigned long, arg5) | |
1da177e4 LT |
1592 | { |
1593 | switch (option) { | |
1594 | case KEYCTL_GET_KEYRING_ID: | |
1595 | return keyctl_get_keyring_ID((key_serial_t) arg2, | |
1596 | (int) arg3); | |
1597 | ||
1598 | case KEYCTL_JOIN_SESSION_KEYRING: | |
1599 | return keyctl_join_session_keyring((const char __user *) arg2); | |
1600 | ||
1601 | case KEYCTL_UPDATE: | |
1602 | return keyctl_update_key((key_serial_t) arg2, | |
1603 | (const void __user *) arg3, | |
1604 | (size_t) arg4); | |
1605 | ||
1606 | case KEYCTL_REVOKE: | |
1607 | return keyctl_revoke_key((key_serial_t) arg2); | |
1608 | ||
1609 | case KEYCTL_DESCRIBE: | |
1610 | return keyctl_describe_key((key_serial_t) arg2, | |
1611 | (char __user *) arg3, | |
1612 | (unsigned) arg4); | |
1613 | ||
1614 | case KEYCTL_CLEAR: | |
1615 | return keyctl_keyring_clear((key_serial_t) arg2); | |
1616 | ||
1617 | case KEYCTL_LINK: | |
1618 | return keyctl_keyring_link((key_serial_t) arg2, | |
1619 | (key_serial_t) arg3); | |
1620 | ||
1621 | case KEYCTL_UNLINK: | |
1622 | return keyctl_keyring_unlink((key_serial_t) arg2, | |
1623 | (key_serial_t) arg3); | |
1624 | ||
1625 | case KEYCTL_SEARCH: | |
1626 | return keyctl_keyring_search((key_serial_t) arg2, | |
1627 | (const char __user *) arg3, | |
1628 | (const char __user *) arg4, | |
1629 | (key_serial_t) arg5); | |
1630 | ||
1631 | case KEYCTL_READ: | |
1632 | return keyctl_read_key((key_serial_t) arg2, | |
1633 | (char __user *) arg3, | |
1634 | (size_t) arg4); | |
1635 | ||
1636 | case KEYCTL_CHOWN: | |
1637 | return keyctl_chown_key((key_serial_t) arg2, | |
1638 | (uid_t) arg3, | |
1639 | (gid_t) arg4); | |
1640 | ||
1641 | case KEYCTL_SETPERM: | |
1642 | return keyctl_setperm_key((key_serial_t) arg2, | |
1643 | (key_perm_t) arg3); | |
1644 | ||
1645 | case KEYCTL_INSTANTIATE: | |
1646 | return keyctl_instantiate_key((key_serial_t) arg2, | |
1647 | (const void __user *) arg3, | |
1648 | (size_t) arg4, | |
1649 | (key_serial_t) arg5); | |
1650 | ||
1651 | case KEYCTL_NEGATE: | |
1652 | return keyctl_negate_key((key_serial_t) arg2, | |
1653 | (unsigned) arg3, | |
1654 | (key_serial_t) arg4); | |
1655 | ||
3e30148c DH |
1656 | case KEYCTL_SET_REQKEY_KEYRING: |
1657 | return keyctl_set_reqkey_keyring(arg2); | |
1658 | ||
017679c4 DH |
1659 | case KEYCTL_SET_TIMEOUT: |
1660 | return keyctl_set_timeout((key_serial_t) arg2, | |
1661 | (unsigned) arg3); | |
1662 | ||
b5f545c8 DH |
1663 | case KEYCTL_ASSUME_AUTHORITY: |
1664 | return keyctl_assume_authority((key_serial_t) arg2); | |
1665 | ||
70a5bb72 DH |
1666 | case KEYCTL_GET_SECURITY: |
1667 | return keyctl_get_security((key_serial_t) arg2, | |
90bd49ab | 1668 | (char __user *) arg3, |
70a5bb72 DH |
1669 | (size_t) arg4); |
1670 | ||
ee18d64c DH |
1671 | case KEYCTL_SESSION_TO_PARENT: |
1672 | return keyctl_session_to_parent(); | |
1673 | ||
fdd1b945 DH |
1674 | case KEYCTL_REJECT: |
1675 | return keyctl_reject_key((key_serial_t) arg2, | |
1676 | (unsigned) arg3, | |
1677 | (unsigned) arg4, | |
1678 | (key_serial_t) arg5); | |
1679 | ||
ee009e4a DH |
1680 | case KEYCTL_INSTANTIATE_IOV: |
1681 | return keyctl_instantiate_key_iov( | |
1682 | (key_serial_t) arg2, | |
1683 | (const struct iovec __user *) arg3, | |
1684 | (unsigned) arg4, | |
1685 | (key_serial_t) arg5); | |
1686 | ||
fd75815f DH |
1687 | case KEYCTL_INVALIDATE: |
1688 | return keyctl_invalidate_key((key_serial_t) arg2); | |
1689 | ||
f36f8c75 DH |
1690 | case KEYCTL_GET_PERSISTENT: |
1691 | return keyctl_get_persistent((uid_t)arg2, (key_serial_t)arg3); | |
1692 | ||
ddbb4114 MM |
1693 | case KEYCTL_DH_COMPUTE: |
1694 | return keyctl_dh_compute((struct keyctl_dh_params __user *) arg2, | |
4693fc73 SM |
1695 | (char __user *) arg3, (size_t) arg4, |
1696 | (void __user *) arg5); | |
ddbb4114 | 1697 | |
1da177e4 LT |
1698 | default: |
1699 | return -EOPNOTSUPP; | |
1700 | } | |
a8b17ed0 | 1701 | } |