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1 | /* -*- mode: c; c-basic-offset: 8; -*- |
2 | * vim: noexpandtab sw=8 ts=8 sts=0: |
3 | * |
4 | * acl.c |
5 | * |
6 | * Copyright (C) 2004, 2008 Oracle. All rights reserved. |
7 | * |
8 | * CREDITS: |
9 | * Lots of code in this file is copy from linux/fs/ext3/acl.c. |
10 | * Copyright (C) 2001-2003 Andreas Gruenbacher, <agruen@suse.de> |
11 | * |
12 | * This program is free software; you can redistribute it and/or |
13 | * modify it under the terms of the GNU General Public |
14 | * License version 2 as published by the Free Software Foundation. |
15 | * |
16 | * This program is distributed in the hope that it will be useful, |
17 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
18 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
19 | * General Public License for more details. |
20 | */ |
21 | |
22 | #include <linux/init.h> |
23 | #include <linux/module.h> |
24 | #include <linux/slab.h> |
25 | #include <linux/string.h> |
26 | |
27 | #include <cluster/masklog.h> |
28 | |
29 | #include "ocfs2.h" |
30 | #include "alloc.h" |
31 | #include "dlmglue.h" |
32 | #include "file.h" |
33 | #include "inode.h" |
34 | #include "journal.h" |
35 | #include "ocfs2_fs.h" |
36 | |
37 | #include "xattr.h" |
38 | #include "acl.h" |
39 | |
40 | /* |
41 | * Convert from xattr value to acl struct. |
42 | */ |
43 | static struct posix_acl *ocfs2_acl_from_xattr(const void *value, size_t size) |
44 | { |
45 | int n, count; |
46 | struct posix_acl *acl; |
47 | |
48 | if (!value) |
49 | return NULL; |
50 | if (size < sizeof(struct posix_acl_entry)) |
51 | return ERR_PTR(-EINVAL); |
52 | |
53 | count = size / sizeof(struct posix_acl_entry); |
54 | if (count < 0) |
55 | return ERR_PTR(-EINVAL); |
56 | if (count == 0) |
57 | return NULL; |
58 | |
59 | acl = posix_acl_alloc(count, GFP_NOFS); |
60 | if (!acl) |
61 | return ERR_PTR(-ENOMEM); |
62 | for (n = 0; n < count; n++) { |
63 | struct ocfs2_acl_entry *entry = |
64 | (struct ocfs2_acl_entry *)value; |
65 | |
66 | acl->a_entries[n].e_tag = le16_to_cpu(entry->e_tag); |
67 | acl->a_entries[n].e_perm = le16_to_cpu(entry->e_perm); |
68 | acl->a_entries[n].e_id = le32_to_cpu(entry->e_id); |
69 | value += sizeof(struct posix_acl_entry); |
70 | |
71 | } |
72 | return acl; |
73 | } |
74 | |
75 | /* |
76 | * Convert acl struct to xattr value. |
77 | */ |
78 | static void *ocfs2_acl_to_xattr(const struct posix_acl *acl, size_t *size) |
79 | { |
80 | struct ocfs2_acl_entry *entry = NULL; |
81 | char *ocfs2_acl; |
82 | size_t n; |
83 | |
84 | *size = acl->a_count * sizeof(struct posix_acl_entry); |
85 | |
86 | ocfs2_acl = kmalloc(*size, GFP_NOFS); |
87 | if (!ocfs2_acl) |
88 | return ERR_PTR(-ENOMEM); |
89 | |
90 | entry = (struct ocfs2_acl_entry *)ocfs2_acl; |
91 | for (n = 0; n < acl->a_count; n++, entry++) { |
92 | entry->e_tag = cpu_to_le16(acl->a_entries[n].e_tag); |
93 | entry->e_perm = cpu_to_le16(acl->a_entries[n].e_perm); |
94 | entry->e_id = cpu_to_le32(acl->a_entries[n].e_id); |
95 | } |
96 | return ocfs2_acl; |
97 | } |
98 | |
99 | static struct posix_acl *ocfs2_get_acl_nolock(struct inode *inode, |
100 | int type, |
101 | struct buffer_head *di_bh) |
102 | { |
103 | int name_index; |
104 | char *value = NULL; |
105 | struct posix_acl *acl; |
106 | int retval; |
107 | |
108 | switch (type) { |
109 | case ACL_TYPE_ACCESS: |
110 | name_index = OCFS2_XATTR_INDEX_POSIX_ACL_ACCESS; |
111 | break; |
112 | case ACL_TYPE_DEFAULT: |
113 | name_index = OCFS2_XATTR_INDEX_POSIX_ACL_DEFAULT; |
114 | break; |
115 | default: |
116 | return ERR_PTR(-EINVAL); |
117 | } |
118 | |
119 | retval = ocfs2_xattr_get_nolock(inode, di_bh, name_index, "", NULL, 0); |
120 | if (retval > 0) { |
121 | value = kmalloc(retval, GFP_NOFS); |
122 | if (!value) |
123 | return ERR_PTR(-ENOMEM); |
124 | retval = ocfs2_xattr_get_nolock(inode, di_bh, name_index, |
125 | "", value, retval); |
126 | } |
127 | |
128 | if (retval > 0) |
129 | acl = ocfs2_acl_from_xattr(value, retval); |
130 | else if (retval == -ENODATA || retval == 0) |
131 | acl = NULL; |
132 | else |
133 | acl = ERR_PTR(retval); |
134 | |
135 | kfree(value); |
136 | |
137 | return acl; |
138 | } |
139 | |
140 | |
141 | /* |
142 | * Get posix acl. |
143 | */ |
144 | static struct posix_acl *ocfs2_get_acl(struct inode *inode, int type) |
145 | { |
146 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); |
147 | struct buffer_head *di_bh = NULL; |
148 | struct posix_acl *acl; |
149 | int ret; |
150 | |
151 | if (!(osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL)) |
152 | return NULL; |
153 | |
154 | ret = ocfs2_inode_lock(inode, &di_bh, 0); |
155 | if (ret < 0) { |
156 | mlog_errno(ret); |
157 | acl = ERR_PTR(ret); |
158 | return acl; |
159 | } |
160 | |
161 | acl = ocfs2_get_acl_nolock(inode, type, di_bh); |
162 | |
163 | ocfs2_inode_unlock(inode, 0); |
164 | |
165 | brelse(di_bh); |
166 | |
167 | return acl; |
168 | } |
169 | |
170 | /* |
171 | * Helper function to set i_mode in memory and disk. Some call paths |
172 | * will not have di_bh or a journal handle to pass, in which case it |
173 | * will create it's own. |
174 | */ |
175 | static int ocfs2_acl_set_mode(struct inode *inode, struct buffer_head *di_bh, |
176 | handle_t *handle, umode_t new_mode) |
177 | { |
178 | int ret, commit_handle = 0; |
179 | struct ocfs2_dinode *di; |
180 | |
181 | if (di_bh == NULL) { |
182 | ret = ocfs2_read_inode_block(inode, &di_bh); |
183 | if (ret) { |
184 | mlog_errno(ret); |
185 | goto out; |
186 | } |
187 | } else |
188 | get_bh(di_bh); |
189 | |
190 | if (handle == NULL) { |
191 | handle = ocfs2_start_trans(OCFS2_SB(inode->i_sb), |
192 | OCFS2_INODE_UPDATE_CREDITS); |
193 | if (IS_ERR(handle)) { |
194 | ret = PTR_ERR(handle); |
195 | mlog_errno(ret); |
196 | goto out_brelse; |
197 | } |
198 | |
199 | commit_handle = 1; |
200 | } |
201 | |
202 | di = (struct ocfs2_dinode *)di_bh->b_data; |
203 | ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), di_bh, |
204 | OCFS2_JOURNAL_ACCESS_WRITE); |
205 | if (ret) { |
206 | mlog_errno(ret); |
207 | goto out_commit; |
208 | } |
209 | |
210 | inode->i_mode = new_mode; |
211 | inode->i_ctime = CURRENT_TIME; |
212 | di->i_mode = cpu_to_le16(inode->i_mode); |
213 | di->i_ctime = cpu_to_le64(inode->i_ctime.tv_sec); |
214 | di->i_ctime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec); |
215 | |
216 | ocfs2_journal_dirty(handle, di_bh); |
217 | |
218 | out_commit: |
219 | if (commit_handle) |
220 | ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle); |
221 | out_brelse: |
222 | brelse(di_bh); |
223 | out: |
224 | return ret; |
225 | } |
226 | |
227 | /* |
228 | * Set the access or default ACL of an inode. |
229 | */ |
230 | static int ocfs2_set_acl(handle_t *handle, |
231 | struct inode *inode, |
232 | struct buffer_head *di_bh, |
233 | int type, |
234 | struct posix_acl *acl, |
235 | struct ocfs2_alloc_context *meta_ac, |
236 | struct ocfs2_alloc_context *data_ac) |
237 | { |
238 | int name_index; |
239 | void *value = NULL; |
240 | size_t size = 0; |
241 | int ret; |
242 | |
243 | if (S_ISLNK(inode->i_mode)) |
244 | return -EOPNOTSUPP; |
245 | |
246 | switch (type) { |
247 | case ACL_TYPE_ACCESS: |
248 | name_index = OCFS2_XATTR_INDEX_POSIX_ACL_ACCESS; |
249 | if (acl) { |
250 | mode_t mode = inode->i_mode; |
251 | ret = posix_acl_equiv_mode(acl, &mode); |
252 | if (ret < 0) |
253 | return ret; |
254 | else { |
255 | if (ret == 0) |
256 | acl = NULL; |
257 | |
258 | ret = ocfs2_acl_set_mode(inode, di_bh, |
259 | handle, mode); |
260 | if (ret) |
261 | return ret; |
262 | |
263 | } |
264 | } |
265 | break; |
266 | case ACL_TYPE_DEFAULT: |
267 | name_index = OCFS2_XATTR_INDEX_POSIX_ACL_DEFAULT; |
268 | if (!S_ISDIR(inode->i_mode)) |
269 | return acl ? -EACCES : 0; |
270 | break; |
271 | default: |
272 | return -EINVAL; |
273 | } |
274 | |
275 | if (acl) { |
276 | value = ocfs2_acl_to_xattr(acl, &size); |
277 | if (IS_ERR(value)) |
278 | return (int)PTR_ERR(value); |
279 | } |
280 | |
281 | if (handle) |
282 | ret = ocfs2_xattr_set_handle(handle, inode, di_bh, name_index, |
283 | "", value, size, 0, |
284 | meta_ac, data_ac); |
285 | else |
286 | ret = ocfs2_xattr_set(inode, name_index, "", value, size, 0); |
287 | |
288 | kfree(value); |
289 | |
290 | return ret; |
291 | } |
292 | |
293 | int ocfs2_check_acl(struct inode *inode, int mask, unsigned int flags) |
294 | { |
295 | struct ocfs2_super *osb; |
296 | struct buffer_head *di_bh = NULL; |
297 | struct posix_acl *acl; |
298 | int ret = -EAGAIN; |
299 | |
300 | if (flags & IPERM_FLAG_RCU) |
301 | return -ECHILD; |
302 | |
303 | osb = OCFS2_SB(inode->i_sb); |
304 | if (!(osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL)) |
305 | return ret; |
306 | |
307 | ret = ocfs2_read_inode_block(inode, &di_bh); |
308 | if (ret < 0) { |
309 | mlog_errno(ret); |
310 | return ret; |
311 | } |
312 | |
313 | acl = ocfs2_get_acl_nolock(inode, ACL_TYPE_ACCESS, di_bh); |
314 | |
315 | brelse(di_bh); |
316 | |
317 | if (IS_ERR(acl)) { |
318 | mlog_errno(PTR_ERR(acl)); |
319 | return PTR_ERR(acl); |
320 | } |
321 | if (acl) { |
322 | ret = posix_acl_permission(inode, acl, mask); |
323 | posix_acl_release(acl); |
324 | return ret; |
325 | } |
326 | |
327 | return -EAGAIN; |
328 | } |
329 | |
330 | int ocfs2_acl_chmod(struct inode *inode) |
331 | { |
332 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); |
333 | struct posix_acl *acl, *clone; |
334 | int ret; |
335 | |
336 | if (S_ISLNK(inode->i_mode)) |
337 | return -EOPNOTSUPP; |
338 | |
339 | if (!(osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL)) |
340 | return 0; |
341 | |
342 | acl = ocfs2_get_acl(inode, ACL_TYPE_ACCESS); |
343 | if (IS_ERR(acl) || !acl) |
344 | return PTR_ERR(acl); |
345 | clone = posix_acl_clone(acl, GFP_KERNEL); |
346 | posix_acl_release(acl); |
347 | if (!clone) |
348 | return -ENOMEM; |
349 | ret = posix_acl_chmod_masq(clone, inode->i_mode); |
350 | if (!ret) |
351 | ret = ocfs2_set_acl(NULL, inode, NULL, ACL_TYPE_ACCESS, |
352 | clone, NULL, NULL); |
353 | posix_acl_release(clone); |
354 | return ret; |
355 | } |
356 | |
357 | /* |
358 | * Initialize the ACLs of a new inode. If parent directory has default ACL, |
359 | * then clone to new inode. Called from ocfs2_mknod. |
360 | */ |
361 | int ocfs2_init_acl(handle_t *handle, |
362 | struct inode *inode, |
363 | struct inode *dir, |
364 | struct buffer_head *di_bh, |
365 | struct buffer_head *dir_bh, |
366 | struct ocfs2_alloc_context *meta_ac, |
367 | struct ocfs2_alloc_context *data_ac) |
368 | { |
369 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); |
370 | struct posix_acl *acl = NULL; |
371 | int ret = 0, ret2; |
372 | mode_t mode; |
373 | |
374 | if (!S_ISLNK(inode->i_mode)) { |
375 | if (osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL) { |
376 | acl = ocfs2_get_acl_nolock(dir, ACL_TYPE_DEFAULT, |
377 | dir_bh); |
378 | if (IS_ERR(acl)) |
379 | return PTR_ERR(acl); |
380 | } |
381 | if (!acl) { |
382 | mode = inode->i_mode & ~current_umask(); |
383 | ret = ocfs2_acl_set_mode(inode, di_bh, handle, mode); |
384 | if (ret) { |
385 | mlog_errno(ret); |
386 | goto cleanup; |
387 | } |
388 | } |
389 | } |
390 | if ((osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL) && acl) { |
391 | struct posix_acl *clone; |
392 | |
393 | if (S_ISDIR(inode->i_mode)) { |
394 | ret = ocfs2_set_acl(handle, inode, di_bh, |
395 | ACL_TYPE_DEFAULT, acl, |
396 | meta_ac, data_ac); |
397 | if (ret) |
398 | goto cleanup; |
399 | } |
400 | clone = posix_acl_clone(acl, GFP_NOFS); |
401 | ret = -ENOMEM; |
402 | if (!clone) |
403 | goto cleanup; |
404 | |
405 | mode = inode->i_mode; |
406 | ret = posix_acl_create_masq(clone, &mode); |
407 | if (ret >= 0) { |
408 | ret2 = ocfs2_acl_set_mode(inode, di_bh, handle, mode); |
409 | if (ret2) { |
410 | mlog_errno(ret2); |
411 | ret = ret2; |
412 | goto cleanup; |
413 | } |
414 | if (ret > 0) { |
415 | ret = ocfs2_set_acl(handle, inode, |
416 | di_bh, ACL_TYPE_ACCESS, |
417 | clone, meta_ac, data_ac); |
418 | } |
419 | } |
420 | posix_acl_release(clone); |
421 | } |
422 | cleanup: |
423 | posix_acl_release(acl); |
424 | return ret; |
425 | } |
426 | |
427 | static size_t ocfs2_xattr_list_acl_access(struct dentry *dentry, |
428 | char *list, |
429 | size_t list_len, |
430 | const char *name, |
431 | size_t name_len, |
432 | int type) |
433 | { |
434 | struct ocfs2_super *osb = OCFS2_SB(dentry->d_sb); |
435 | const size_t size = sizeof(POSIX_ACL_XATTR_ACCESS); |
436 | |
437 | if (!(osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL)) |
438 | return 0; |
439 | |
440 | if (list && size <= list_len) |
441 | memcpy(list, POSIX_ACL_XATTR_ACCESS, size); |
442 | return size; |
443 | } |
444 | |
445 | static size_t ocfs2_xattr_list_acl_default(struct dentry *dentry, |
446 | char *list, |
447 | size_t list_len, |
448 | const char *name, |
449 | size_t name_len, |
450 | int type) |
451 | { |
452 | struct ocfs2_super *osb = OCFS2_SB(dentry->d_sb); |
453 | const size_t size = sizeof(POSIX_ACL_XATTR_DEFAULT); |
454 | |
455 | if (!(osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL)) |
456 | return 0; |
457 | |
458 | if (list && size <= list_len) |
459 | memcpy(list, POSIX_ACL_XATTR_DEFAULT, size); |
460 | return size; |
461 | } |
462 | |
463 | static int ocfs2_xattr_get_acl(struct dentry *dentry, const char *name, |
464 | void *buffer, size_t size, int type) |
465 | { |
466 | struct ocfs2_super *osb = OCFS2_SB(dentry->d_sb); |
467 | struct posix_acl *acl; |
468 | int ret; |
469 | |
470 | if (strcmp(name, "") != 0) |
471 | return -EINVAL; |
472 | if (!(osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL)) |
473 | return -EOPNOTSUPP; |
474 | |
475 | acl = ocfs2_get_acl(dentry->d_inode, type); |
476 | if (IS_ERR(acl)) |
477 | return PTR_ERR(acl); |
478 | if (acl == NULL) |
479 | return -ENODATA; |
480 | ret = posix_acl_to_xattr(acl, buffer, size); |
481 | posix_acl_release(acl); |
482 | |
483 | return ret; |
484 | } |
485 | |
486 | static int ocfs2_xattr_set_acl(struct dentry *dentry, const char *name, |
487 | const void *value, size_t size, int flags, int type) |
488 | { |
489 | struct inode *inode = dentry->d_inode; |
490 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); |
491 | struct posix_acl *acl; |
492 | int ret = 0; |
493 | |
494 | if (strcmp(name, "") != 0) |
495 | return -EINVAL; |
496 | if (!(osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL)) |
497 | return -EOPNOTSUPP; |
498 | |
499 | if (!inode_owner_or_capable(inode)) |
500 | return -EPERM; |
501 | |
502 | if (value) { |
503 | acl = posix_acl_from_xattr(value, size); |
504 | if (IS_ERR(acl)) |
505 | return PTR_ERR(acl); |
506 | else if (acl) { |
507 | ret = posix_acl_valid(acl); |
508 | if (ret) |
509 | goto cleanup; |
510 | } |
511 | } else |
512 | acl = NULL; |
513 | |
514 | ret = ocfs2_set_acl(NULL, inode, NULL, type, acl, NULL, NULL); |
515 | |
516 | cleanup: |
517 | posix_acl_release(acl); |
518 | return ret; |
519 | } |
520 | |
521 | const struct xattr_handler ocfs2_xattr_acl_access_handler = { |
522 | .prefix = POSIX_ACL_XATTR_ACCESS, |
523 | .flags = ACL_TYPE_ACCESS, |
524 | .list = ocfs2_xattr_list_acl_access, |
525 | .get = ocfs2_xattr_get_acl, |
526 | .set = ocfs2_xattr_set_acl, |
527 | }; |
528 | |
529 | const struct xattr_handler ocfs2_xattr_acl_default_handler = { |
530 | .prefix = POSIX_ACL_XATTR_DEFAULT, |
531 | .flags = ACL_TYPE_DEFAULT, |
532 | .list = ocfs2_xattr_list_acl_default, |
533 | .get = ocfs2_xattr_get_acl, |
534 | .set = ocfs2_xattr_set_acl, |
535 | }; |
536 |
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