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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 | ||
1da177e4 LT |
12 | #include <linux/init.h> |
13 | #include <linux/sched.h> | |
29930025 | 14 | #include <linux/sched/task.h> |
1da177e4 LT |
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> |
5b825c3a | 21 | #include <linux/cred.h> |
0cb409d9 | 22 | #include <linux/string.h> |
1da177e4 | 23 | #include <linux/err.h> |
38bbca6b | 24 | #include <linux/vmalloc.h> |
70a5bb72 | 25 | #include <linux/security.h> |
a27bb332 | 26 | #include <linux/uio.h> |
7c0f6ba6 | 27 | #include <linux/uaccess.h> |
822ad64d | 28 | #include <keys/request_key_auth-type.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 | ||
5649645d | 102 | if (plen) { |
1da177e4 | 103 | ret = -ENOMEM; |
752ade68 MH |
104 | payload = kvmalloc(plen, GFP_KERNEL); |
105 | if (!payload) | |
106 | goto error2; | |
1da177e4 LT |
107 | |
108 | ret = -EFAULT; | |
109 | if (copy_from_user(payload, _payload, plen) != 0) | |
110 | goto error3; | |
111 | } | |
112 | ||
113 | /* find the target keyring (which must be writable) */ | |
f5895943 | 114 | keyring_ref = lookup_user_key(ringid, KEY_LOOKUP_CREATE, KEY_NEED_WRITE); |
664cceb0 DH |
115 | if (IS_ERR(keyring_ref)) { |
116 | ret = PTR_ERR(keyring_ref); | |
1da177e4 LT |
117 | goto error3; |
118 | } | |
119 | ||
120 | /* create or update the requested key and add it to the target | |
121 | * keyring */ | |
664cceb0 | 122 | key_ref = key_create_or_update(keyring_ref, type, description, |
6b79ccb5 AR |
123 | payload, plen, KEY_PERM_UNDEF, |
124 | KEY_ALLOC_IN_QUOTA); | |
664cceb0 DH |
125 | if (!IS_ERR(key_ref)) { |
126 | ret = key_ref_to_ptr(key_ref)->serial; | |
127 | key_ref_put(key_ref); | |
1da177e4 LT |
128 | } |
129 | else { | |
664cceb0 | 130 | ret = PTR_ERR(key_ref); |
1da177e4 LT |
131 | } |
132 | ||
664cceb0 | 133 | key_ref_put(keyring_ref); |
1da177e4 | 134 | error3: |
57070c85 EB |
135 | if (payload) { |
136 | memzero_explicit(payload, plen); | |
137 | kvfree(payload); | |
138 | } | |
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 | |
ee8f844e DH |
274 | * be skipped over. It is not permitted for userspace to create or join |
275 | * keyrings whose name begin with a dot. | |
973c9f4f DH |
276 | * |
277 | * If successful, the ID of the joined session keyring will be returned. | |
1da177e4 LT |
278 | */ |
279 | long keyctl_join_session_keyring(const char __user *_name) | |
280 | { | |
281 | char *name; | |
0cb409d9 | 282 | long ret; |
1da177e4 LT |
283 | |
284 | /* fetch the name from userspace */ | |
285 | name = NULL; | |
286 | if (_name) { | |
aa9d4437 | 287 | name = strndup_user(_name, KEY_MAX_DESC_SIZE); |
0cb409d9 DA |
288 | if (IS_ERR(name)) { |
289 | ret = PTR_ERR(name); | |
1da177e4 | 290 | goto error; |
0cb409d9 | 291 | } |
ee8f844e DH |
292 | |
293 | ret = -EPERM; | |
294 | if (name[0] == '.') | |
295 | goto error_name; | |
1da177e4 LT |
296 | } |
297 | ||
298 | /* join the session */ | |
299 | ret = join_session_keyring(name); | |
ee8f844e | 300 | error_name: |
0d54ee1c | 301 | kfree(name); |
c5b60b5e | 302 | error: |
1da177e4 | 303 | return ret; |
a8b17ed0 | 304 | } |
1da177e4 | 305 | |
1da177e4 | 306 | /* |
973c9f4f DH |
307 | * Update a key's data payload from the given data. |
308 | * | |
309 | * The key must grant the caller Write permission and the key type must support | |
310 | * updating for this to work. A negative key can be positively instantiated | |
311 | * with this call. | |
312 | * | |
313 | * If successful, 0 will be returned. If the key type does not support | |
314 | * updating, then -EOPNOTSUPP will be returned. | |
1da177e4 LT |
315 | */ |
316 | long keyctl_update_key(key_serial_t id, | |
317 | const void __user *_payload, | |
318 | size_t plen) | |
319 | { | |
664cceb0 | 320 | key_ref_t key_ref; |
1da177e4 LT |
321 | void *payload; |
322 | long ret; | |
323 | ||
324 | ret = -EINVAL; | |
325 | if (plen > PAGE_SIZE) | |
326 | goto error; | |
327 | ||
328 | /* pull the payload in if one was supplied */ | |
329 | payload = NULL; | |
5649645d | 330 | if (plen) { |
1da177e4 LT |
331 | ret = -ENOMEM; |
332 | payload = kmalloc(plen, GFP_KERNEL); | |
333 | if (!payload) | |
334 | goto error; | |
335 | ||
336 | ret = -EFAULT; | |
337 | if (copy_from_user(payload, _payload, plen) != 0) | |
338 | goto error2; | |
339 | } | |
340 | ||
341 | /* find the target key (which must be writable) */ | |
f5895943 | 342 | key_ref = lookup_user_key(id, 0, KEY_NEED_WRITE); |
664cceb0 DH |
343 | if (IS_ERR(key_ref)) { |
344 | ret = PTR_ERR(key_ref); | |
1da177e4 LT |
345 | goto error2; |
346 | } | |
347 | ||
348 | /* update the key */ | |
664cceb0 | 349 | ret = key_update(key_ref, payload, plen); |
1da177e4 | 350 | |
664cceb0 | 351 | key_ref_put(key_ref); |
c5b60b5e | 352 | error2: |
57070c85 | 353 | kzfree(payload); |
c5b60b5e | 354 | error: |
1da177e4 | 355 | return ret; |
a8b17ed0 | 356 | } |
1da177e4 | 357 | |
1da177e4 | 358 | /* |
973c9f4f DH |
359 | * Revoke a key. |
360 | * | |
361 | * The key must be grant the caller Write or Setattr permission for this to | |
362 | * work. The key type should give up its quota claim when revoked. The key | |
363 | * and any links to the key will be automatically garbage collected after a | |
364 | * certain amount of time (/proc/sys/kernel/keys/gc_delay). | |
365 | * | |
d3600bcf MZ |
366 | * Keys with KEY_FLAG_KEEP set should not be revoked. |
367 | * | |
973c9f4f | 368 | * If successful, 0 is returned. |
1da177e4 LT |
369 | */ |
370 | long keyctl_revoke_key(key_serial_t id) | |
371 | { | |
664cceb0 | 372 | key_ref_t key_ref; |
d3600bcf | 373 | struct key *key; |
1da177e4 LT |
374 | long ret; |
375 | ||
f5895943 | 376 | key_ref = lookup_user_key(id, 0, KEY_NEED_WRITE); |
664cceb0 DH |
377 | if (IS_ERR(key_ref)) { |
378 | ret = PTR_ERR(key_ref); | |
0c2c9a3f DH |
379 | if (ret != -EACCES) |
380 | goto error; | |
f5895943 | 381 | key_ref = lookup_user_key(id, 0, KEY_NEED_SETATTR); |
0c2c9a3f DH |
382 | if (IS_ERR(key_ref)) { |
383 | ret = PTR_ERR(key_ref); | |
384 | goto error; | |
385 | } | |
1da177e4 LT |
386 | } |
387 | ||
d3600bcf | 388 | key = key_ref_to_ptr(key_ref); |
1da177e4 | 389 | ret = 0; |
d3600bcf | 390 | if (test_bit(KEY_FLAG_KEEP, &key->flags)) |
1d6d167c MZ |
391 | ret = -EPERM; |
392 | else | |
d3600bcf | 393 | key_revoke(key); |
1da177e4 | 394 | |
664cceb0 | 395 | key_ref_put(key_ref); |
c5b60b5e | 396 | error: |
1260f801 | 397 | return ret; |
a8b17ed0 | 398 | } |
1da177e4 | 399 | |
fd75815f DH |
400 | /* |
401 | * Invalidate a key. | |
402 | * | |
403 | * The key must be grant the caller Invalidate permission for this to work. | |
404 | * The key and any links to the key will be automatically garbage collected | |
405 | * immediately. | |
406 | * | |
d3600bcf MZ |
407 | * Keys with KEY_FLAG_KEEP set should not be invalidated. |
408 | * | |
fd75815f DH |
409 | * If successful, 0 is returned. |
410 | */ | |
411 | long keyctl_invalidate_key(key_serial_t id) | |
412 | { | |
413 | key_ref_t key_ref; | |
d3600bcf | 414 | struct key *key; |
fd75815f DH |
415 | long ret; |
416 | ||
417 | kenter("%d", id); | |
418 | ||
f5895943 | 419 | key_ref = lookup_user_key(id, 0, KEY_NEED_SEARCH); |
fd75815f DH |
420 | if (IS_ERR(key_ref)) { |
421 | ret = PTR_ERR(key_ref); | |
0c7774ab DH |
422 | |
423 | /* Root is permitted to invalidate certain special keys */ | |
424 | if (capable(CAP_SYS_ADMIN)) { | |
425 | key_ref = lookup_user_key(id, 0, 0); | |
426 | if (IS_ERR(key_ref)) | |
427 | goto error; | |
428 | if (test_bit(KEY_FLAG_ROOT_CAN_INVAL, | |
429 | &key_ref_to_ptr(key_ref)->flags)) | |
430 | goto invalidate; | |
431 | goto error_put; | |
432 | } | |
433 | ||
fd75815f DH |
434 | goto error; |
435 | } | |
436 | ||
0c7774ab | 437 | invalidate: |
d3600bcf | 438 | key = key_ref_to_ptr(key_ref); |
fd75815f | 439 | ret = 0; |
d3600bcf MZ |
440 | if (test_bit(KEY_FLAG_KEEP, &key->flags)) |
441 | ret = -EPERM; | |
1d6d167c | 442 | else |
d3600bcf | 443 | key_invalidate(key); |
0c7774ab | 444 | error_put: |
fd75815f DH |
445 | key_ref_put(key_ref); |
446 | error: | |
447 | kleave(" = %ld", ret); | |
448 | return ret; | |
449 | } | |
450 | ||
1da177e4 | 451 | /* |
973c9f4f DH |
452 | * Clear the specified keyring, creating an empty process keyring if one of the |
453 | * special keyring IDs is used. | |
454 | * | |
d3600bcf MZ |
455 | * The keyring must grant the caller Write permission and not have |
456 | * KEY_FLAG_KEEP set for this to work. If successful, 0 will be returned. | |
1da177e4 LT |
457 | */ |
458 | long keyctl_keyring_clear(key_serial_t ringid) | |
459 | { | |
664cceb0 | 460 | key_ref_t keyring_ref; |
d3600bcf | 461 | struct key *keyring; |
1da177e4 LT |
462 | long ret; |
463 | ||
f5895943 | 464 | keyring_ref = lookup_user_key(ringid, KEY_LOOKUP_CREATE, KEY_NEED_WRITE); |
664cceb0 DH |
465 | if (IS_ERR(keyring_ref)) { |
466 | ret = PTR_ERR(keyring_ref); | |
700920eb DH |
467 | |
468 | /* Root is permitted to invalidate certain special keyrings */ | |
469 | if (capable(CAP_SYS_ADMIN)) { | |
470 | keyring_ref = lookup_user_key(ringid, 0, 0); | |
471 | if (IS_ERR(keyring_ref)) | |
472 | goto error; | |
473 | if (test_bit(KEY_FLAG_ROOT_CAN_CLEAR, | |
474 | &key_ref_to_ptr(keyring_ref)->flags)) | |
475 | goto clear; | |
476 | goto error_put; | |
477 | } | |
478 | ||
1da177e4 LT |
479 | goto error; |
480 | } | |
481 | ||
700920eb | 482 | clear: |
d3600bcf MZ |
483 | keyring = key_ref_to_ptr(keyring_ref); |
484 | if (test_bit(KEY_FLAG_KEEP, &keyring->flags)) | |
485 | ret = -EPERM; | |
486 | else | |
487 | ret = keyring_clear(keyring); | |
700920eb | 488 | error_put: |
664cceb0 | 489 | key_ref_put(keyring_ref); |
c5b60b5e | 490 | error: |
1da177e4 | 491 | return ret; |
a8b17ed0 | 492 | } |
1da177e4 | 493 | |
1da177e4 | 494 | /* |
973c9f4f DH |
495 | * Create a link from a keyring to a key if there's no matching key in the |
496 | * keyring, otherwise replace the link to the matching key with a link to the | |
497 | * new key. | |
498 | * | |
499 | * The key must grant the caller Link permission and the the keyring must grant | |
500 | * the caller Write permission. Furthermore, if an additional link is created, | |
501 | * the keyring's quota will be extended. | |
502 | * | |
503 | * If successful, 0 will be returned. | |
1da177e4 LT |
504 | */ |
505 | long keyctl_keyring_link(key_serial_t id, key_serial_t ringid) | |
506 | { | |
664cceb0 | 507 | key_ref_t keyring_ref, key_ref; |
1da177e4 LT |
508 | long ret; |
509 | ||
f5895943 | 510 | keyring_ref = lookup_user_key(ringid, KEY_LOOKUP_CREATE, KEY_NEED_WRITE); |
664cceb0 DH |
511 | if (IS_ERR(keyring_ref)) { |
512 | ret = PTR_ERR(keyring_ref); | |
1da177e4 LT |
513 | goto error; |
514 | } | |
515 | ||
f5895943 | 516 | key_ref = lookup_user_key(id, KEY_LOOKUP_CREATE, KEY_NEED_LINK); |
664cceb0 DH |
517 | if (IS_ERR(key_ref)) { |
518 | ret = PTR_ERR(key_ref); | |
1da177e4 LT |
519 | goto error2; |
520 | } | |
521 | ||
664cceb0 | 522 | ret = key_link(key_ref_to_ptr(keyring_ref), key_ref_to_ptr(key_ref)); |
1da177e4 | 523 | |
664cceb0 | 524 | key_ref_put(key_ref); |
c5b60b5e | 525 | error2: |
664cceb0 | 526 | key_ref_put(keyring_ref); |
c5b60b5e | 527 | error: |
1da177e4 | 528 | return ret; |
a8b17ed0 | 529 | } |
1da177e4 | 530 | |
1da177e4 | 531 | /* |
973c9f4f DH |
532 | * Unlink a key from a keyring. |
533 | * | |
534 | * The keyring must grant the caller Write permission for this to work; the key | |
535 | * itself need not grant the caller anything. If the last link to a key is | |
536 | * removed then that key will be scheduled for destruction. | |
537 | * | |
d3600bcf MZ |
538 | * Keys or keyrings with KEY_FLAG_KEEP set should not be unlinked. |
539 | * | |
973c9f4f | 540 | * If successful, 0 will be returned. |
1da177e4 LT |
541 | */ |
542 | long keyctl_keyring_unlink(key_serial_t id, key_serial_t ringid) | |
543 | { | |
664cceb0 | 544 | key_ref_t keyring_ref, key_ref; |
d3600bcf | 545 | struct key *keyring, *key; |
1da177e4 LT |
546 | long ret; |
547 | ||
f5895943 | 548 | keyring_ref = lookup_user_key(ringid, 0, KEY_NEED_WRITE); |
664cceb0 DH |
549 | if (IS_ERR(keyring_ref)) { |
550 | ret = PTR_ERR(keyring_ref); | |
1da177e4 LT |
551 | goto error; |
552 | } | |
553 | ||
5593122e | 554 | key_ref = lookup_user_key(id, KEY_LOOKUP_FOR_UNLINK, 0); |
664cceb0 DH |
555 | if (IS_ERR(key_ref)) { |
556 | ret = PTR_ERR(key_ref); | |
1da177e4 LT |
557 | goto error2; |
558 | } | |
559 | ||
d3600bcf MZ |
560 | keyring = key_ref_to_ptr(keyring_ref); |
561 | key = key_ref_to_ptr(key_ref); | |
562 | if (test_bit(KEY_FLAG_KEEP, &keyring->flags) && | |
563 | test_bit(KEY_FLAG_KEEP, &key->flags)) | |
564 | ret = -EPERM; | |
565 | else | |
566 | ret = key_unlink(keyring, key); | |
1da177e4 | 567 | |
664cceb0 | 568 | key_ref_put(key_ref); |
c5b60b5e | 569 | error2: |
664cceb0 | 570 | key_ref_put(keyring_ref); |
c5b60b5e | 571 | error: |
1da177e4 | 572 | return ret; |
a8b17ed0 | 573 | } |
1da177e4 | 574 | |
1da177e4 | 575 | /* |
973c9f4f DH |
576 | * Return a description of a key to userspace. |
577 | * | |
578 | * The key must grant the caller View permission for this to work. | |
579 | * | |
580 | * If there's a buffer, we place up to buflen bytes of data into it formatted | |
581 | * in the following way: | |
582 | * | |
1da177e4 | 583 | * type;uid;gid;perm;description<NUL> |
973c9f4f DH |
584 | * |
585 | * If successful, we return the amount of description available, irrespective | |
586 | * of how much we may have copied into the buffer. | |
1da177e4 LT |
587 | */ |
588 | long keyctl_describe_key(key_serial_t keyid, | |
589 | char __user *buffer, | |
590 | size_t buflen) | |
591 | { | |
3e30148c | 592 | struct key *key, *instkey; |
664cceb0 | 593 | key_ref_t key_ref; |
aa9d4437 | 594 | char *infobuf; |
1da177e4 | 595 | long ret; |
aa9d4437 | 596 | int desclen, infolen; |
1da177e4 | 597 | |
f5895943 | 598 | key_ref = lookup_user_key(keyid, KEY_LOOKUP_PARTIAL, KEY_NEED_VIEW); |
664cceb0 | 599 | if (IS_ERR(key_ref)) { |
3e30148c DH |
600 | /* viewing a key under construction is permitted if we have the |
601 | * authorisation token handy */ | |
664cceb0 | 602 | if (PTR_ERR(key_ref) == -EACCES) { |
3e30148c DH |
603 | instkey = key_get_instantiation_authkey(keyid); |
604 | if (!IS_ERR(instkey)) { | |
605 | key_put(instkey); | |
8bbf4976 | 606 | key_ref = lookup_user_key(keyid, |
5593122e DH |
607 | KEY_LOOKUP_PARTIAL, |
608 | 0); | |
664cceb0 | 609 | if (!IS_ERR(key_ref)) |
3e30148c DH |
610 | goto okay; |
611 | } | |
612 | } | |
613 | ||
664cceb0 | 614 | ret = PTR_ERR(key_ref); |
1da177e4 LT |
615 | goto error; |
616 | } | |
617 | ||
3e30148c | 618 | okay: |
664cceb0 | 619 | key = key_ref_to_ptr(key_ref); |
aa9d4437 | 620 | desclen = strlen(key->description); |
664cceb0 | 621 | |
aa9d4437 DH |
622 | /* calculate how much information we're going to return */ |
623 | ret = -ENOMEM; | |
624 | infobuf = kasprintf(GFP_KERNEL, | |
625 | "%s;%d;%d;%08x;", | |
626 | key->type->name, | |
627 | from_kuid_munged(current_user_ns(), key->uid), | |
628 | from_kgid_munged(current_user_ns(), key->gid), | |
629 | key->perm); | |
630 | if (!infobuf) | |
631 | goto error2; | |
632 | infolen = strlen(infobuf); | |
633 | ret = infolen + desclen + 1; | |
1da177e4 LT |
634 | |
635 | /* consider returning the data */ | |
aa9d4437 DH |
636 | if (buffer && buflen >= ret) { |
637 | if (copy_to_user(buffer, infobuf, infolen) != 0 || | |
638 | copy_to_user(buffer + infolen, key->description, | |
639 | desclen + 1) != 0) | |
1da177e4 LT |
640 | ret = -EFAULT; |
641 | } | |
642 | ||
aa9d4437 | 643 | kfree(infobuf); |
c5b60b5e | 644 | error2: |
664cceb0 | 645 | key_ref_put(key_ref); |
c5b60b5e | 646 | error: |
1da177e4 | 647 | return ret; |
a8b17ed0 | 648 | } |
1da177e4 | 649 | |
1da177e4 | 650 | /* |
973c9f4f DH |
651 | * Search the specified keyring and any keyrings it links to for a matching |
652 | * key. Only keyrings that grant the caller Search permission will be searched | |
653 | * (this includes the starting keyring). Only keys with Search permission can | |
654 | * be found. | |
655 | * | |
656 | * If successful, the found key will be linked to the destination keyring if | |
657 | * supplied and the key has Link permission, and the found key ID will be | |
658 | * returned. | |
1da177e4 LT |
659 | */ |
660 | long keyctl_keyring_search(key_serial_t ringid, | |
661 | const char __user *_type, | |
662 | const char __user *_description, | |
663 | key_serial_t destringid) | |
664 | { | |
665 | struct key_type *ktype; | |
664cceb0 | 666 | key_ref_t keyring_ref, key_ref, dest_ref; |
1da177e4 | 667 | char type[32], *description; |
0cb409d9 | 668 | long ret; |
1da177e4 LT |
669 | |
670 | /* pull the type and description into kernel space */ | |
0cb409d9 | 671 | ret = key_get_type_from_user(type, _type, sizeof(type)); |
1da177e4 LT |
672 | if (ret < 0) |
673 | goto error; | |
1da177e4 | 674 | |
aa9d4437 | 675 | description = strndup_user(_description, KEY_MAX_DESC_SIZE); |
0cb409d9 DA |
676 | if (IS_ERR(description)) { |
677 | ret = PTR_ERR(description); | |
1da177e4 | 678 | goto error; |
0cb409d9 | 679 | } |
1da177e4 LT |
680 | |
681 | /* get the keyring at which to begin the search */ | |
f5895943 | 682 | keyring_ref = lookup_user_key(ringid, 0, KEY_NEED_SEARCH); |
664cceb0 DH |
683 | if (IS_ERR(keyring_ref)) { |
684 | ret = PTR_ERR(keyring_ref); | |
1da177e4 LT |
685 | goto error2; |
686 | } | |
687 | ||
688 | /* get the destination keyring if specified */ | |
664cceb0 | 689 | dest_ref = NULL; |
1da177e4 | 690 | if (destringid) { |
5593122e | 691 | dest_ref = lookup_user_key(destringid, KEY_LOOKUP_CREATE, |
f5895943 | 692 | KEY_NEED_WRITE); |
664cceb0 DH |
693 | if (IS_ERR(dest_ref)) { |
694 | ret = PTR_ERR(dest_ref); | |
1da177e4 LT |
695 | goto error3; |
696 | } | |
697 | } | |
698 | ||
699 | /* find the key type */ | |
700 | ktype = key_type_lookup(type); | |
701 | if (IS_ERR(ktype)) { | |
702 | ret = PTR_ERR(ktype); | |
703 | goto error4; | |
704 | } | |
705 | ||
706 | /* do the search */ | |
664cceb0 DH |
707 | key_ref = keyring_search(keyring_ref, ktype, description); |
708 | if (IS_ERR(key_ref)) { | |
709 | ret = PTR_ERR(key_ref); | |
1da177e4 LT |
710 | |
711 | /* treat lack or presence of a negative key the same */ | |
712 | if (ret == -EAGAIN) | |
713 | ret = -ENOKEY; | |
714 | goto error5; | |
715 | } | |
716 | ||
717 | /* link the resulting key to the destination keyring if we can */ | |
664cceb0 | 718 | if (dest_ref) { |
f5895943 | 719 | ret = key_permission(key_ref, KEY_NEED_LINK); |
29db9190 | 720 | if (ret < 0) |
1da177e4 LT |
721 | goto error6; |
722 | ||
664cceb0 | 723 | ret = key_link(key_ref_to_ptr(dest_ref), key_ref_to_ptr(key_ref)); |
1da177e4 LT |
724 | if (ret < 0) |
725 | goto error6; | |
726 | } | |
727 | ||
664cceb0 | 728 | ret = key_ref_to_ptr(key_ref)->serial; |
1da177e4 | 729 | |
c5b60b5e | 730 | error6: |
664cceb0 | 731 | key_ref_put(key_ref); |
c5b60b5e | 732 | error5: |
1da177e4 | 733 | key_type_put(ktype); |
c5b60b5e | 734 | error4: |
664cceb0 | 735 | key_ref_put(dest_ref); |
c5b60b5e | 736 | error3: |
664cceb0 | 737 | key_ref_put(keyring_ref); |
c5b60b5e | 738 | error2: |
1da177e4 | 739 | kfree(description); |
c5b60b5e | 740 | error: |
1da177e4 | 741 | return ret; |
a8b17ed0 | 742 | } |
1da177e4 | 743 | |
1da177e4 | 744 | /* |
973c9f4f DH |
745 | * Read a key's payload. |
746 | * | |
747 | * The key must either grant the caller Read permission, or it must grant the | |
748 | * caller Search permission when searched for from the process keyrings. | |
749 | * | |
750 | * If successful, we place up to buflen bytes of data into the buffer, if one | |
751 | * is provided, and return the amount of data that is available in the key, | |
752 | * irrespective of how much we copied into the buffer. | |
1da177e4 LT |
753 | */ |
754 | long keyctl_read_key(key_serial_t keyid, char __user *buffer, size_t buflen) | |
755 | { | |
664cceb0 DH |
756 | struct key *key; |
757 | key_ref_t key_ref; | |
1da177e4 LT |
758 | long ret; |
759 | ||
760 | /* find the key first */ | |
5593122e | 761 | key_ref = lookup_user_key(keyid, 0, 0); |
664cceb0 DH |
762 | if (IS_ERR(key_ref)) { |
763 | ret = -ENOKEY; | |
764 | goto error; | |
1da177e4 LT |
765 | } |
766 | ||
664cceb0 DH |
767 | key = key_ref_to_ptr(key_ref); |
768 | ||
363b02da DH |
769 | ret = key_read_state(key); |
770 | if (ret < 0) | |
771 | goto error2; /* Negatively instantiated */ | |
37863c43 | 772 | |
664cceb0 | 773 | /* see if we can read it directly */ |
f5895943 | 774 | ret = key_permission(key_ref, KEY_NEED_READ); |
29db9190 | 775 | if (ret == 0) |
664cceb0 | 776 | goto can_read_key; |
29db9190 | 777 | if (ret != -EACCES) |
7fc0786d | 778 | goto error2; |
664cceb0 DH |
779 | |
780 | /* we can't; see if it's searchable from this process's keyrings | |
781 | * - we automatically take account of the fact that it may be | |
782 | * dangling off an instantiation key | |
783 | */ | |
784 | if (!is_key_possessed(key_ref)) { | |
785 | ret = -EACCES; | |
786 | goto error2; | |
787 | } | |
1da177e4 LT |
788 | |
789 | /* the key is probably readable - now try to read it */ | |
c5b60b5e | 790 | can_read_key: |
b4a1b4f5 DH |
791 | ret = -EOPNOTSUPP; |
792 | if (key->type->read) { | |
793 | /* Read the data with the semaphore held (since we might sleep) | |
794 | * to protect against the key being updated or revoked. | |
795 | */ | |
796 | down_read(&key->sem); | |
797 | ret = key_validate(key); | |
798 | if (ret == 0) | |
1da177e4 | 799 | ret = key->type->read(key, buffer, buflen); |
b4a1b4f5 | 800 | up_read(&key->sem); |
1da177e4 LT |
801 | } |
802 | ||
c5b60b5e | 803 | error2: |
1da177e4 | 804 | key_put(key); |
c5b60b5e | 805 | error: |
1da177e4 | 806 | return ret; |
a8b17ed0 | 807 | } |
1da177e4 | 808 | |
1da177e4 | 809 | /* |
973c9f4f DH |
810 | * Change the ownership of a key |
811 | * | |
812 | * The key must grant the caller Setattr permission for this to work, though | |
813 | * the key need not be fully instantiated yet. For the UID to be changed, or | |
814 | * for the GID to be changed to a group the caller is not a member of, the | |
815 | * caller must have sysadmin capability. If either uid or gid is -1 then that | |
816 | * attribute is not changed. | |
817 | * | |
818 | * If the UID is to be changed, the new user must have sufficient quota to | |
819 | * accept the key. The quota deduction will be removed from the old user to | |
820 | * the new user should the attribute be changed. | |
821 | * | |
822 | * If successful, 0 will be returned. | |
1da177e4 | 823 | */ |
9a56c2db | 824 | long keyctl_chown_key(key_serial_t id, uid_t user, gid_t group) |
1da177e4 | 825 | { |
5801649d | 826 | struct key_user *newowner, *zapowner = NULL; |
1da177e4 | 827 | struct key *key; |
664cceb0 | 828 | key_ref_t key_ref; |
1da177e4 | 829 | long ret; |
9a56c2db EB |
830 | kuid_t uid; |
831 | kgid_t gid; | |
832 | ||
833 | uid = make_kuid(current_user_ns(), user); | |
834 | gid = make_kgid(current_user_ns(), group); | |
835 | ret = -EINVAL; | |
836 | if ((user != (uid_t) -1) && !uid_valid(uid)) | |
837 | goto error; | |
838 | if ((group != (gid_t) -1) && !gid_valid(gid)) | |
839 | goto error; | |
1da177e4 LT |
840 | |
841 | ret = 0; | |
9a56c2db | 842 | if (user == (uid_t) -1 && group == (gid_t) -1) |
1da177e4 LT |
843 | goto error; |
844 | ||
5593122e | 845 | key_ref = lookup_user_key(id, KEY_LOOKUP_CREATE | KEY_LOOKUP_PARTIAL, |
f5895943 | 846 | KEY_NEED_SETATTR); |
664cceb0 DH |
847 | if (IS_ERR(key_ref)) { |
848 | ret = PTR_ERR(key_ref); | |
1da177e4 LT |
849 | goto error; |
850 | } | |
851 | ||
664cceb0 DH |
852 | key = key_ref_to_ptr(key_ref); |
853 | ||
1da177e4 LT |
854 | /* make the changes with the locks held to prevent chown/chown races */ |
855 | ret = -EACCES; | |
856 | down_write(&key->sem); | |
1da177e4 LT |
857 | |
858 | if (!capable(CAP_SYS_ADMIN)) { | |
859 | /* only the sysadmin can chown a key to some other UID */ | |
9a56c2db | 860 | if (user != (uid_t) -1 && !uid_eq(key->uid, uid)) |
5801649d | 861 | goto error_put; |
1da177e4 LT |
862 | |
863 | /* only the sysadmin can set the key's GID to a group other | |
864 | * than one of those that the current process subscribes to */ | |
9a56c2db | 865 | if (group != (gid_t) -1 && !gid_eq(gid, key->gid) && !in_group_p(gid)) |
5801649d | 866 | goto error_put; |
1da177e4 LT |
867 | } |
868 | ||
5801649d | 869 | /* change the UID */ |
9a56c2db | 870 | if (user != (uid_t) -1 && !uid_eq(uid, key->uid)) { |
5801649d | 871 | ret = -ENOMEM; |
9a56c2db | 872 | newowner = key_user_lookup(uid); |
5801649d FT |
873 | if (!newowner) |
874 | goto error_put; | |
875 | ||
876 | /* transfer the quota burden to the new user */ | |
877 | if (test_bit(KEY_FLAG_IN_QUOTA, &key->flags)) { | |
9a56c2db | 878 | unsigned maxkeys = uid_eq(uid, GLOBAL_ROOT_UID) ? |
0b77f5bf | 879 | key_quota_root_maxkeys : key_quota_maxkeys; |
9a56c2db | 880 | unsigned maxbytes = uid_eq(uid, GLOBAL_ROOT_UID) ? |
0b77f5bf DH |
881 | key_quota_root_maxbytes : key_quota_maxbytes; |
882 | ||
5801649d | 883 | spin_lock(&newowner->lock); |
0b77f5bf DH |
884 | if (newowner->qnkeys + 1 >= maxkeys || |
885 | newowner->qnbytes + key->quotalen >= maxbytes || | |
886 | newowner->qnbytes + key->quotalen < | |
887 | newowner->qnbytes) | |
5801649d FT |
888 | goto quota_overrun; |
889 | ||
890 | newowner->qnkeys++; | |
891 | newowner->qnbytes += key->quotalen; | |
892 | spin_unlock(&newowner->lock); | |
893 | ||
894 | spin_lock(&key->user->lock); | |
895 | key->user->qnkeys--; | |
896 | key->user->qnbytes -= key->quotalen; | |
897 | spin_unlock(&key->user->lock); | |
898 | } | |
899 | ||
900 | atomic_dec(&key->user->nkeys); | |
901 | atomic_inc(&newowner->nkeys); | |
902 | ||
363b02da | 903 | if (key->state != KEY_IS_UNINSTANTIATED) { |
5801649d FT |
904 | atomic_dec(&key->user->nikeys); |
905 | atomic_inc(&newowner->nikeys); | |
906 | } | |
907 | ||
908 | zapowner = key->user; | |
909 | key->user = newowner; | |
910 | key->uid = uid; | |
1da177e4 LT |
911 | } |
912 | ||
913 | /* change the GID */ | |
9a56c2db | 914 | if (group != (gid_t) -1) |
1da177e4 LT |
915 | key->gid = gid; |
916 | ||
917 | ret = 0; | |
918 | ||
5801649d | 919 | error_put: |
1da177e4 LT |
920 | up_write(&key->sem); |
921 | key_put(key); | |
5801649d FT |
922 | if (zapowner) |
923 | key_user_put(zapowner); | |
924 | error: | |
1da177e4 LT |
925 | return ret; |
926 | ||
5801649d FT |
927 | quota_overrun: |
928 | spin_unlock(&newowner->lock); | |
929 | zapowner = newowner; | |
930 | ret = -EDQUOT; | |
931 | goto error_put; | |
a8b17ed0 | 932 | } |
5801649d | 933 | |
1da177e4 | 934 | /* |
973c9f4f DH |
935 | * Change the permission mask on a key. |
936 | * | |
937 | * The key must grant the caller Setattr permission for this to work, though | |
938 | * the key need not be fully instantiated yet. If the caller does not have | |
939 | * sysadmin capability, it may only change the permission on keys that it owns. | |
1da177e4 LT |
940 | */ |
941 | long keyctl_setperm_key(key_serial_t id, key_perm_t perm) | |
942 | { | |
943 | struct key *key; | |
664cceb0 | 944 | key_ref_t key_ref; |
1da177e4 LT |
945 | long ret; |
946 | ||
947 | ret = -EINVAL; | |
664cceb0 | 948 | if (perm & ~(KEY_POS_ALL | KEY_USR_ALL | KEY_GRP_ALL | KEY_OTH_ALL)) |
1da177e4 LT |
949 | goto error; |
950 | ||
5593122e | 951 | key_ref = lookup_user_key(id, KEY_LOOKUP_CREATE | KEY_LOOKUP_PARTIAL, |
f5895943 | 952 | KEY_NEED_SETATTR); |
664cceb0 DH |
953 | if (IS_ERR(key_ref)) { |
954 | ret = PTR_ERR(key_ref); | |
1da177e4 LT |
955 | goto error; |
956 | } | |
957 | ||
664cceb0 DH |
958 | key = key_ref_to_ptr(key_ref); |
959 | ||
76d8aeab | 960 | /* make the changes with the locks held to prevent chown/chmod races */ |
1da177e4 LT |
961 | ret = -EACCES; |
962 | down_write(&key->sem); | |
1da177e4 | 963 | |
76d8aeab | 964 | /* if we're not the sysadmin, we can only change a key that we own */ |
9a56c2db | 965 | if (capable(CAP_SYS_ADMIN) || uid_eq(key->uid, current_fsuid())) { |
76d8aeab DH |
966 | key->perm = perm; |
967 | ret = 0; | |
968 | } | |
1da177e4 | 969 | |
1da177e4 LT |
970 | up_write(&key->sem); |
971 | key_put(key); | |
76d8aeab | 972 | error: |
1da177e4 | 973 | return ret; |
a8b17ed0 | 974 | } |
1da177e4 | 975 | |
8bbf4976 | 976 | /* |
973c9f4f DH |
977 | * Get the destination keyring for instantiation and check that the caller has |
978 | * Write permission on it. | |
8bbf4976 DH |
979 | */ |
980 | static long get_instantiation_keyring(key_serial_t ringid, | |
981 | struct request_key_auth *rka, | |
982 | struct key **_dest_keyring) | |
983 | { | |
984 | key_ref_t dkref; | |
985 | ||
eca1bf5b DH |
986 | *_dest_keyring = NULL; |
987 | ||
8bbf4976 | 988 | /* just return a NULL pointer if we weren't asked to make a link */ |
eca1bf5b | 989 | if (ringid == 0) |
8bbf4976 | 990 | return 0; |
8bbf4976 DH |
991 | |
992 | /* if a specific keyring is nominated by ID, then use that */ | |
993 | if (ringid > 0) { | |
f5895943 | 994 | dkref = lookup_user_key(ringid, KEY_LOOKUP_CREATE, KEY_NEED_WRITE); |
8bbf4976 DH |
995 | if (IS_ERR(dkref)) |
996 | return PTR_ERR(dkref); | |
997 | *_dest_keyring = key_ref_to_ptr(dkref); | |
998 | return 0; | |
999 | } | |
1000 | ||
1001 | if (ringid == KEY_SPEC_REQKEY_AUTH_KEY) | |
1002 | return -EINVAL; | |
1003 | ||
1004 | /* otherwise specify the destination keyring recorded in the | |
1005 | * authorisation key (any KEY_SPEC_*_KEYRING) */ | |
1006 | if (ringid >= KEY_SPEC_REQUESTOR_KEYRING) { | |
21279cfa | 1007 | *_dest_keyring = key_get(rka->dest_keyring); |
8bbf4976 DH |
1008 | return 0; |
1009 | } | |
1010 | ||
1011 | return -ENOKEY; | |
1012 | } | |
1013 | ||
d84f4f99 | 1014 | /* |
973c9f4f | 1015 | * Change the request_key authorisation key on the current process. |
d84f4f99 DH |
1016 | */ |
1017 | static int keyctl_change_reqkey_auth(struct key *key) | |
1018 | { | |
1019 | struct cred *new; | |
1020 | ||
1021 | new = prepare_creds(); | |
1022 | if (!new) | |
1023 | return -ENOMEM; | |
1024 | ||
1025 | key_put(new->request_key_auth); | |
1026 | new->request_key_auth = key_get(key); | |
1027 | ||
1028 | return commit_creds(new); | |
1029 | } | |
1030 | ||
1da177e4 | 1031 | /* |
973c9f4f DH |
1032 | * Instantiate a key with the specified payload and link the key into the |
1033 | * destination keyring if one is given. | |
1034 | * | |
1035 | * The caller must have the appropriate instantiation permit set for this to | |
1036 | * work (see keyctl_assume_authority). No other permissions are required. | |
1037 | * | |
1038 | * If successful, 0 will be returned. | |
1da177e4 | 1039 | */ |
ee009e4a | 1040 | long keyctl_instantiate_key_common(key_serial_t id, |
b353a1f7 | 1041 | struct iov_iter *from, |
ee009e4a | 1042 | key_serial_t ringid) |
1da177e4 | 1043 | { |
d84f4f99 | 1044 | const struct cred *cred = current_cred(); |
3e30148c | 1045 | struct request_key_auth *rka; |
8bbf4976 | 1046 | struct key *instkey, *dest_keyring; |
b353a1f7 | 1047 | size_t plen = from ? iov_iter_count(from) : 0; |
1da177e4 LT |
1048 | void *payload; |
1049 | long ret; | |
1050 | ||
d84f4f99 DH |
1051 | kenter("%d,,%zu,%d", id, plen, ringid); |
1052 | ||
b353a1f7 AV |
1053 | if (!plen) |
1054 | from = NULL; | |
1055 | ||
1da177e4 | 1056 | ret = -EINVAL; |
38bbca6b | 1057 | if (plen > 1024 * 1024 - 1) |
1da177e4 LT |
1058 | goto error; |
1059 | ||
b5f545c8 DH |
1060 | /* the appropriate instantiation authorisation key must have been |
1061 | * assumed before calling this */ | |
1062 | ret = -EPERM; | |
d84f4f99 | 1063 | instkey = cred->request_key_auth; |
b5f545c8 DH |
1064 | if (!instkey) |
1065 | goto error; | |
1066 | ||
146aa8b1 | 1067 | rka = instkey->payload.data[0]; |
b5f545c8 DH |
1068 | if (rka->target_key->serial != id) |
1069 | goto error; | |
1070 | ||
1da177e4 LT |
1071 | /* pull the payload in if one was supplied */ |
1072 | payload = NULL; | |
1073 | ||
b353a1f7 | 1074 | if (from) { |
1da177e4 | 1075 | ret = -ENOMEM; |
752ade68 MH |
1076 | payload = kvmalloc(plen, GFP_KERNEL); |
1077 | if (!payload) | |
1078 | goto error; | |
1da177e4 | 1079 | |
b353a1f7 | 1080 | ret = -EFAULT; |
cbbd26b8 | 1081 | if (!copy_from_iter_full(payload, plen, from)) |
1da177e4 LT |
1082 | goto error2; |
1083 | } | |
1084 | ||
3e30148c DH |
1085 | /* find the destination keyring amongst those belonging to the |
1086 | * requesting task */ | |
8bbf4976 DH |
1087 | ret = get_instantiation_keyring(ringid, rka, &dest_keyring); |
1088 | if (ret < 0) | |
1089 | goto error2; | |
1da177e4 LT |
1090 | |
1091 | /* instantiate the key and link it into a keyring */ | |
3e30148c | 1092 | ret = key_instantiate_and_link(rka->target_key, payload, plen, |
8bbf4976 | 1093 | dest_keyring, instkey); |
1da177e4 | 1094 | |
8bbf4976 | 1095 | key_put(dest_keyring); |
b5f545c8 DH |
1096 | |
1097 | /* discard the assumed authority if it's just been disabled by | |
1098 | * instantiation of the key */ | |
d84f4f99 DH |
1099 | if (ret == 0) |
1100 | keyctl_change_reqkey_auth(NULL); | |
b5f545c8 DH |
1101 | |
1102 | error2: | |
57070c85 EB |
1103 | if (payload) { |
1104 | memzero_explicit(payload, plen); | |
1105 | kvfree(payload); | |
1106 | } | |
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 | 1412 | ret = keyctl_change_reqkey_auth(authkey); |
884bee02 EB |
1413 | if (ret == 0) |
1414 | ret = authkey->serial; | |
d84f4f99 | 1415 | key_put(authkey); |
b5f545c8 DH |
1416 | error: |
1417 | return ret; | |
a8b17ed0 | 1418 | } |
b5f545c8 | 1419 | |
70a5bb72 | 1420 | /* |
973c9f4f DH |
1421 | * Get a key's the LSM security label. |
1422 | * | |
1423 | * The key must grant the caller View permission for this to work. | |
1424 | * | |
1425 | * If there's a buffer, then up to buflen bytes of data will be placed into it. | |
1426 | * | |
1427 | * If successful, the amount of information available will be returned, | |
1428 | * irrespective of how much was copied (including the terminal NUL). | |
70a5bb72 DH |
1429 | */ |
1430 | long keyctl_get_security(key_serial_t keyid, | |
1431 | char __user *buffer, | |
1432 | size_t buflen) | |
1433 | { | |
1434 | struct key *key, *instkey; | |
1435 | key_ref_t key_ref; | |
1436 | char *context; | |
1437 | long ret; | |
1438 | ||
f5895943 | 1439 | key_ref = lookup_user_key(keyid, KEY_LOOKUP_PARTIAL, KEY_NEED_VIEW); |
70a5bb72 DH |
1440 | if (IS_ERR(key_ref)) { |
1441 | if (PTR_ERR(key_ref) != -EACCES) | |
1442 | return PTR_ERR(key_ref); | |
1443 | ||
1444 | /* viewing a key under construction is also permitted if we | |
1445 | * have the authorisation token handy */ | |
1446 | instkey = key_get_instantiation_authkey(keyid); | |
1447 | if (IS_ERR(instkey)) | |
fa1cc7b5 | 1448 | return PTR_ERR(instkey); |
70a5bb72 DH |
1449 | key_put(instkey); |
1450 | ||
5593122e | 1451 | key_ref = lookup_user_key(keyid, KEY_LOOKUP_PARTIAL, 0); |
70a5bb72 DH |
1452 | if (IS_ERR(key_ref)) |
1453 | return PTR_ERR(key_ref); | |
1454 | } | |
1455 | ||
1456 | key = key_ref_to_ptr(key_ref); | |
1457 | ret = security_key_getsecurity(key, &context); | |
1458 | if (ret == 0) { | |
1459 | /* if no information was returned, give userspace an empty | |
1460 | * string */ | |
1461 | ret = 1; | |
1462 | if (buffer && buflen > 0 && | |
1463 | copy_to_user(buffer, "", 1) != 0) | |
1464 | ret = -EFAULT; | |
1465 | } else if (ret > 0) { | |
1466 | /* return as much data as there's room for */ | |
1467 | if (buffer && buflen > 0) { | |
1468 | if (buflen > ret) | |
1469 | buflen = ret; | |
1470 | ||
1471 | if (copy_to_user(buffer, context, buflen) != 0) | |
1472 | ret = -EFAULT; | |
1473 | } | |
1474 | ||
1475 | kfree(context); | |
1476 | } | |
1477 | ||
1478 | key_ref_put(key_ref); | |
1479 | return ret; | |
1480 | } | |
1481 | ||
ee18d64c | 1482 | /* |
973c9f4f DH |
1483 | * Attempt to install the calling process's session keyring on the process's |
1484 | * parent process. | |
1485 | * | |
1486 | * The keyring must exist and must grant the caller LINK permission, and the | |
1487 | * parent process must be single-threaded and must have the same effective | |
1488 | * ownership as this process and mustn't be SUID/SGID. | |
1489 | * | |
1490 | * The keyring will be emplaced on the parent when it next resumes userspace. | |
1491 | * | |
1492 | * If successful, 0 will be returned. | |
ee18d64c DH |
1493 | */ |
1494 | long keyctl_session_to_parent(void) | |
1495 | { | |
1496 | struct task_struct *me, *parent; | |
1497 | const struct cred *mycred, *pcred; | |
67d12145 | 1498 | struct callback_head *newwork, *oldwork; |
ee18d64c | 1499 | key_ref_t keyring_r; |
413cd3d9 | 1500 | struct cred *cred; |
ee18d64c DH |
1501 | int ret; |
1502 | ||
f5895943 | 1503 | keyring_r = lookup_user_key(KEY_SPEC_SESSION_KEYRING, 0, KEY_NEED_LINK); |
ee18d64c DH |
1504 | if (IS_ERR(keyring_r)) |
1505 | return PTR_ERR(keyring_r); | |
1506 | ||
413cd3d9 | 1507 | ret = -ENOMEM; |
413cd3d9 | 1508 | |
ee18d64c DH |
1509 | /* our parent is going to need a new cred struct, a new tgcred struct |
1510 | * and new security data, so we allocate them here to prevent ENOMEM in | |
1511 | * our parent */ | |
ee18d64c DH |
1512 | cred = cred_alloc_blank(); |
1513 | if (!cred) | |
67d12145 AV |
1514 | goto error_keyring; |
1515 | newwork = &cred->rcu; | |
ee18d64c | 1516 | |
3a50597d DH |
1517 | cred->session_keyring = key_ref_to_ptr(keyring_r); |
1518 | keyring_r = NULL; | |
67d12145 | 1519 | init_task_work(newwork, key_change_session_keyring); |
ee18d64c DH |
1520 | |
1521 | me = current; | |
9d1ac65a | 1522 | rcu_read_lock(); |
ee18d64c DH |
1523 | write_lock_irq(&tasklist_lock); |
1524 | ||
ee18d64c | 1525 | ret = -EPERM; |
413cd3d9 ON |
1526 | oldwork = NULL; |
1527 | parent = me->real_parent; | |
ee18d64c DH |
1528 | |
1529 | /* the parent mustn't be init and mustn't be a kernel thread */ | |
1530 | if (parent->pid <= 1 || !parent->mm) | |
413cd3d9 | 1531 | goto unlock; |
ee18d64c DH |
1532 | |
1533 | /* the parent must be single threaded */ | |
dd98acf7 | 1534 | if (!thread_group_empty(parent)) |
413cd3d9 | 1535 | goto unlock; |
ee18d64c DH |
1536 | |
1537 | /* the parent and the child must have different session keyrings or | |
1538 | * there's no point */ | |
1539 | mycred = current_cred(); | |
1540 | pcred = __task_cred(parent); | |
1541 | if (mycred == pcred || | |
3a50597d | 1542 | mycred->session_keyring == pcred->session_keyring) { |
413cd3d9 ON |
1543 | ret = 0; |
1544 | goto unlock; | |
1545 | } | |
ee18d64c DH |
1546 | |
1547 | /* the parent must have the same effective ownership and mustn't be | |
1548 | * SUID/SGID */ | |
9a56c2db EB |
1549 | if (!uid_eq(pcred->uid, mycred->euid) || |
1550 | !uid_eq(pcred->euid, mycred->euid) || | |
1551 | !uid_eq(pcred->suid, mycred->euid) || | |
1552 | !gid_eq(pcred->gid, mycred->egid) || | |
1553 | !gid_eq(pcred->egid, mycred->egid) || | |
1554 | !gid_eq(pcred->sgid, mycred->egid)) | |
413cd3d9 | 1555 | goto unlock; |
ee18d64c DH |
1556 | |
1557 | /* the keyrings must have the same UID */ | |
3a50597d | 1558 | if ((pcred->session_keyring && |
2a74dbb9 LT |
1559 | !uid_eq(pcred->session_keyring->uid, mycred->euid)) || |
1560 | !uid_eq(mycred->session_keyring->uid, mycred->euid)) | |
413cd3d9 | 1561 | goto unlock; |
ee18d64c | 1562 | |
413cd3d9 ON |
1563 | /* cancel an already pending keyring replacement */ |
1564 | oldwork = task_work_cancel(parent, key_change_session_keyring); | |
ee18d64c DH |
1565 | |
1566 | /* the replacement session keyring is applied just prior to userspace | |
1567 | * restarting */ | |
67d12145 | 1568 | ret = task_work_add(parent, newwork, true); |
413cd3d9 ON |
1569 | if (!ret) |
1570 | newwork = NULL; | |
1571 | unlock: | |
ee18d64c | 1572 | write_unlock_irq(&tasklist_lock); |
9d1ac65a | 1573 | rcu_read_unlock(); |
67d12145 AV |
1574 | if (oldwork) |
1575 | put_cred(container_of(oldwork, struct cred, rcu)); | |
1576 | if (newwork) | |
1577 | put_cred(cred); | |
ee18d64c DH |
1578 | return ret; |
1579 | ||
1580 | error_keyring: | |
1581 | key_ref_put(keyring_r); | |
1582 | return ret; | |
1583 | } | |
1584 | ||
6563c91f MM |
1585 | /* |
1586 | * Apply a restriction to a given keyring. | |
1587 | * | |
1588 | * The caller must have Setattr permission to change keyring restrictions. | |
1589 | * | |
1590 | * The requested type name may be a NULL pointer to reject all attempts | |
18026d86 EB |
1591 | * to link to the keyring. In this case, _restriction must also be NULL. |
1592 | * Otherwise, both _type and _restriction must be non-NULL. | |
6563c91f MM |
1593 | * |
1594 | * Returns 0 if successful. | |
1595 | */ | |
1596 | long keyctl_restrict_keyring(key_serial_t id, const char __user *_type, | |
1597 | const char __user *_restriction) | |
1598 | { | |
1599 | key_ref_t key_ref; | |
6563c91f MM |
1600 | char type[32]; |
1601 | char *restriction = NULL; | |
1602 | long ret; | |
1603 | ||
1604 | key_ref = lookup_user_key(id, 0, KEY_NEED_SETATTR); | |
1605 | if (IS_ERR(key_ref)) | |
1606 | return PTR_ERR(key_ref); | |
1607 | ||
18026d86 | 1608 | ret = -EINVAL; |
6563c91f | 1609 | if (_type) { |
18026d86 | 1610 | if (!_restriction) |
6563c91f | 1611 | goto error; |
6563c91f | 1612 | |
18026d86 EB |
1613 | ret = key_get_type_from_user(type, _type, sizeof(type)); |
1614 | if (ret < 0) | |
6563c91f | 1615 | goto error; |
6563c91f MM |
1616 | |
1617 | restriction = strndup_user(_restriction, PAGE_SIZE); | |
1618 | if (IS_ERR(restriction)) { | |
1619 | ret = PTR_ERR(restriction); | |
1620 | goto error; | |
1621 | } | |
18026d86 EB |
1622 | } else { |
1623 | if (_restriction) | |
1624 | goto error; | |
6563c91f MM |
1625 | } |
1626 | ||
18026d86 | 1627 | ret = keyring_restrict(key_ref, _type ? type : NULL, restriction); |
6563c91f | 1628 | kfree(restriction); |
6563c91f MM |
1629 | error: |
1630 | key_ref_put(key_ref); | |
6563c91f MM |
1631 | return ret; |
1632 | } | |
1633 | ||
1da177e4 | 1634 | /* |
973c9f4f | 1635 | * The key control system call |
1da177e4 | 1636 | */ |
938bb9f5 HC |
1637 | SYSCALL_DEFINE5(keyctl, int, option, unsigned long, arg2, unsigned long, arg3, |
1638 | unsigned long, arg4, unsigned long, arg5) | |
1da177e4 LT |
1639 | { |
1640 | switch (option) { | |
1641 | case KEYCTL_GET_KEYRING_ID: | |
1642 | return keyctl_get_keyring_ID((key_serial_t) arg2, | |
1643 | (int) arg3); | |
1644 | ||
1645 | case KEYCTL_JOIN_SESSION_KEYRING: | |
1646 | return keyctl_join_session_keyring((const char __user *) arg2); | |
1647 | ||
1648 | case KEYCTL_UPDATE: | |
1649 | return keyctl_update_key((key_serial_t) arg2, | |
1650 | (const void __user *) arg3, | |
1651 | (size_t) arg4); | |
1652 | ||
1653 | case KEYCTL_REVOKE: | |
1654 | return keyctl_revoke_key((key_serial_t) arg2); | |
1655 | ||
1656 | case KEYCTL_DESCRIBE: | |
1657 | return keyctl_describe_key((key_serial_t) arg2, | |
1658 | (char __user *) arg3, | |
1659 | (unsigned) arg4); | |
1660 | ||
1661 | case KEYCTL_CLEAR: | |
1662 | return keyctl_keyring_clear((key_serial_t) arg2); | |
1663 | ||
1664 | case KEYCTL_LINK: | |
1665 | return keyctl_keyring_link((key_serial_t) arg2, | |
1666 | (key_serial_t) arg3); | |
1667 | ||
1668 | case KEYCTL_UNLINK: | |
1669 | return keyctl_keyring_unlink((key_serial_t) arg2, | |
1670 | (key_serial_t) arg3); | |
1671 | ||
1672 | case KEYCTL_SEARCH: | |
1673 | return keyctl_keyring_search((key_serial_t) arg2, | |
1674 | (const char __user *) arg3, | |
1675 | (const char __user *) arg4, | |
1676 | (key_serial_t) arg5); | |
1677 | ||
1678 | case KEYCTL_READ: | |
1679 | return keyctl_read_key((key_serial_t) arg2, | |
1680 | (char __user *) arg3, | |
1681 | (size_t) arg4); | |
1682 | ||
1683 | case KEYCTL_CHOWN: | |
1684 | return keyctl_chown_key((key_serial_t) arg2, | |
1685 | (uid_t) arg3, | |
1686 | (gid_t) arg4); | |
1687 | ||
1688 | case KEYCTL_SETPERM: | |
1689 | return keyctl_setperm_key((key_serial_t) arg2, | |
1690 | (key_perm_t) arg3); | |
1691 | ||
1692 | case KEYCTL_INSTANTIATE: | |
1693 | return keyctl_instantiate_key((key_serial_t) arg2, | |
1694 | (const void __user *) arg3, | |
1695 | (size_t) arg4, | |
1696 | (key_serial_t) arg5); | |
1697 | ||
1698 | case KEYCTL_NEGATE: | |
1699 | return keyctl_negate_key((key_serial_t) arg2, | |
1700 | (unsigned) arg3, | |
1701 | (key_serial_t) arg4); | |
1702 | ||
3e30148c DH |
1703 | case KEYCTL_SET_REQKEY_KEYRING: |
1704 | return keyctl_set_reqkey_keyring(arg2); | |
1705 | ||
017679c4 DH |
1706 | case KEYCTL_SET_TIMEOUT: |
1707 | return keyctl_set_timeout((key_serial_t) arg2, | |
1708 | (unsigned) arg3); | |
1709 | ||
b5f545c8 DH |
1710 | case KEYCTL_ASSUME_AUTHORITY: |
1711 | return keyctl_assume_authority((key_serial_t) arg2); | |
1712 | ||
70a5bb72 DH |
1713 | case KEYCTL_GET_SECURITY: |
1714 | return keyctl_get_security((key_serial_t) arg2, | |
90bd49ab | 1715 | (char __user *) arg3, |
70a5bb72 DH |
1716 | (size_t) arg4); |
1717 | ||
ee18d64c DH |
1718 | case KEYCTL_SESSION_TO_PARENT: |
1719 | return keyctl_session_to_parent(); | |
1720 | ||
fdd1b945 DH |
1721 | case KEYCTL_REJECT: |
1722 | return keyctl_reject_key((key_serial_t) arg2, | |
1723 | (unsigned) arg3, | |
1724 | (unsigned) arg4, | |
1725 | (key_serial_t) arg5); | |
1726 | ||
ee009e4a DH |
1727 | case KEYCTL_INSTANTIATE_IOV: |
1728 | return keyctl_instantiate_key_iov( | |
1729 | (key_serial_t) arg2, | |
1730 | (const struct iovec __user *) arg3, | |
1731 | (unsigned) arg4, | |
1732 | (key_serial_t) arg5); | |
1733 | ||
fd75815f DH |
1734 | case KEYCTL_INVALIDATE: |
1735 | return keyctl_invalidate_key((key_serial_t) arg2); | |
1736 | ||
f36f8c75 DH |
1737 | case KEYCTL_GET_PERSISTENT: |
1738 | return keyctl_get_persistent((uid_t)arg2, (key_serial_t)arg3); | |
1739 | ||
ddbb4114 MM |
1740 | case KEYCTL_DH_COMPUTE: |
1741 | return keyctl_dh_compute((struct keyctl_dh_params __user *) arg2, | |
4693fc73 | 1742 | (char __user *) arg3, (size_t) arg4, |
f1c316a3 | 1743 | (struct keyctl_kdf_params __user *) arg5); |
ddbb4114 | 1744 | |
6563c91f MM |
1745 | case KEYCTL_RESTRICT_KEYRING: |
1746 | return keyctl_restrict_keyring((key_serial_t) arg2, | |
1747 | (const char __user *) arg3, | |
1748 | (const char __user *) arg4); | |
ddbb4114 | 1749 | |
00d60fd3 DH |
1750 | case KEYCTL_PKEY_QUERY: |
1751 | if (arg3 != 0) | |
1752 | return -EINVAL; | |
1753 | return keyctl_pkey_query((key_serial_t)arg2, | |
1754 | (const char __user *)arg4, | |
468e91ce | 1755 | (struct keyctl_pkey_query __user *)arg5); |
00d60fd3 DH |
1756 | |
1757 | case KEYCTL_PKEY_ENCRYPT: | |
1758 | case KEYCTL_PKEY_DECRYPT: | |
1759 | case KEYCTL_PKEY_SIGN: | |
1760 | return keyctl_pkey_e_d_s( | |
1761 | option, | |
1762 | (const struct keyctl_pkey_params __user *)arg2, | |
1763 | (const char __user *)arg3, | |
1764 | (const void __user *)arg4, | |
1765 | (void __user *)arg5); | |
1766 | ||
1767 | case KEYCTL_PKEY_VERIFY: | |
1768 | return keyctl_pkey_verify( | |
1769 | (const struct keyctl_pkey_params __user *)arg2, | |
1770 | (const char __user *)arg3, | |
1771 | (const void __user *)arg4, | |
1772 | (const void __user *)arg5); | |
1773 | ||
1da177e4 LT |
1774 | default: |
1775 | return -EOPNOTSUPP; | |
1776 | } | |
a8b17ed0 | 1777 | } |