1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3 *
4 * Copyright (c) 2017, Fedor Uporov
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 *
28 * $FreeBSD$
29 */
30
31 #include <sys/param.h>
32 #include <sys/systm.h>
33 #include <sys/types.h>
34 #include <sys/stat.h>
35 #include <sys/kernel.h>
36 #include <sys/malloc.h>
37 #include <sys/vnode.h>
38 #include <sys/bio.h>
39 #include <sys/buf.h>
40 #include <sys/endian.h>
41 #include <sys/conf.h>
42 #include <sys/mount.h>
43 #include <sys/extattr.h>
44
45 #include <fs/ext2fs/fs.h>
46 #include <fs/ext2fs/ext2fs.h>
47 #include <fs/ext2fs/inode.h>
48 #include <fs/ext2fs/ext2_acl.h>
49 #include <fs/ext2fs/ext2_extattr.h>
50 #include <fs/ext2fs/ext2_extern.h>
51 #include <fs/ext2fs/ext2_dinode.h>
52 #include <fs/ext2fs/ext2_mount.h>
53
54 #ifdef UFS_ACL
55
56 void
57 ext2_sync_acl_from_inode(struct inode *ip, struct acl *acl)
58 {
59 struct acl_entry *acl_mask, *acl_group_obj;
60 int i;
61
62 /*
63 * Update ACL_USER_OBJ, ACL_OTHER, but simply identify ACL_MASK
64 * and ACL_GROUP_OBJ for use after we know whether ACL_MASK is
65 * present.
66 */
67 acl_mask = NULL;
68 acl_group_obj = NULL;
69 for (i = 0; i < acl->acl_cnt; i++) {
70 switch (acl->acl_entry[i].ae_tag) {
71 case ACL_USER_OBJ:
72 acl->acl_entry[i].ae_perm = acl_posix1e_mode_to_perm(
73 ACL_USER_OBJ, ip->i_mode);
74 acl->acl_entry[i].ae_id = ACL_UNDEFINED_ID;
75 break;
76
77 case ACL_GROUP_OBJ:
78 acl_group_obj = &acl->acl_entry[i];
79 acl->acl_entry[i].ae_id = ACL_UNDEFINED_ID;
80 break;
81
82 case ACL_OTHER:
83 acl->acl_entry[i].ae_perm = acl_posix1e_mode_to_perm(
84 ACL_OTHER, ip->i_mode);
85 acl->acl_entry[i].ae_id = ACL_UNDEFINED_ID;
86 break;
87
88 case ACL_MASK:
89 acl_mask = &acl->acl_entry[i];
90 acl->acl_entry[i].ae_id = ACL_UNDEFINED_ID;
91 break;
92
93 case ACL_USER:
94 case ACL_GROUP:
95 break;
96
97 default:
98 panic("ext2_sync_acl_from_inode(): bad ae_tag");
99 }
100 }
101
102 if (acl_group_obj == NULL)
103 panic("ext2_sync_acl_from_inode(): no ACL_GROUP_OBJ");
104
105 if (acl_mask == NULL) {
106 /*
107 * There is no ACL_MASK, so update ACL_GROUP_OBJ.
108 */
109 acl_group_obj->ae_perm = acl_posix1e_mode_to_perm(
110 ACL_GROUP_OBJ, ip->i_mode);
111 } else {
112 /*
113 * Update the ACL_MASK entry instead of ACL_GROUP_OBJ.
114 */
115 acl_mask->ae_perm = acl_posix1e_mode_to_perm(ACL_GROUP_OBJ,
116 ip->i_mode);
117 }
118 }
119
120 static void
121 ext2_sync_inode_from_acl(struct acl *acl, struct inode *ip)
122 {
123
124 ip->i_mode &= ACL_PRESERVE_MASK;
125 ip->i_mode |= acl_posix1e_acl_to_mode(acl);
126 }
127
128 /*
129 * Convert from filesystem to in-memory representation.
130 */
131 static int
132 ext4_acl_from_disk(char *value, size_t size, struct acl *acl)
133 {
134 const char *end;
135 int n, count, s;
136
137 if (value == NULL)
138 return (EINVAL);
139
140 end = value + size;
141
142 if (((struct ext2_acl_header *)value)->a_version != EXT4_ACL_VERSION)
143 return (EINVAL);
144
145 if (size < sizeof(struct ext2_acl_header))
146 return (EINVAL);
147
148 s = size - sizeof(struct ext2_acl_header);
149 s -= 4 * sizeof(struct ext2_acl_entry_short);
150 if (s < 0)
151 if ((size - sizeof(struct ext2_acl_header)) %
152 sizeof(struct ext2_acl_entry_short))
153 count = -1;
154 else
155 count = (size - sizeof(struct ext2_acl_header)) /
156 sizeof(struct ext2_acl_entry_short);
157 else
158 if (s % sizeof(struct ext2_acl_entry))
159 count = -1;
160 else
161 count = s / sizeof(struct ext2_acl_entry) + 4;
162
163 if (count <= 0 || count > acl->acl_maxcnt)
164 return (EINVAL);
165
166 value = value + sizeof(struct ext2_acl_header);
167
168 for (n = 0; n < count; n++) {
169 struct ext2_acl_entry *entry = (struct ext2_acl_entry *)value;
170 if ((char *)value + sizeof(struct ext2_acl_entry_short) > end)
171 return (EINVAL);
172
173 acl->acl_entry[n].ae_tag = entry->ae_tag;
174 acl->acl_entry[n].ae_perm = entry->ae_perm;
175
176 switch (acl->acl_entry[n].ae_tag) {
177 case ACL_USER_OBJ:
178 case ACL_GROUP_OBJ:
179 case ACL_MASK:
180 case ACL_OTHER:
181 value = (char *)value + sizeof(struct ext2_acl_entry_short);
182 break;
183
184 case ACL_USER:
185 value = (char *)value + sizeof(struct ext2_acl_entry);
186 if ((char *)value > end)
187 return (EINVAL);
188
189 acl->acl_entry[n].ae_id = entry->ae_id;
190 break;
191
192 case ACL_GROUP:
193 value = (char *)value + sizeof(struct ext2_acl_entry);
194 if ((char *)value > end)
195 return (EINVAL);
196
197 acl->acl_entry[n].ae_id = entry->ae_id;
198 break;
199
200 default:
201 return (EINVAL);
202 }
203 }
204
205 if (value != end)
206 return (EINVAL);
207
208 acl->acl_cnt = count;
209
210 return (0);
211 }
212
213 static int
214 ext2_getacl_posix1e(struct vop_getacl_args *ap)
215 {
216 int attrnamespace;
217 const char *attrname;
218 char *value;
219 int len;
220 int error;
221
222 switch (ap->a_type) {
223 case ACL_TYPE_DEFAULT:
224 attrnamespace = POSIX1E_ACL_DEFAULT_EXTATTR_NAMESPACE;
225 attrname = POSIX1E_ACL_DEFAULT_EXTATTR_NAME;
226 break;
227 case ACL_TYPE_ACCESS:
228 attrnamespace = POSIX1E_ACL_ACCESS_EXTATTR_NAMESPACE;
229 attrname = POSIX1E_ACL_ACCESS_EXTATTR_NAME;
230 break;
231 default:
232 return (EINVAL);
233 }
234
235 len = sizeof(*ap->a_aclp) + sizeof(struct ext2_acl_header);
236 value = malloc(len, M_ACL, M_WAITOK);
237
238 error = vn_extattr_get(ap->a_vp, IO_NODELOCKED, attrnamespace, attrname,
239 &len, value, ap->a_td);
240 if (error == ENOATTR) {
241 switch (ap->a_type) {
242 case ACL_TYPE_ACCESS:
243 ap->a_aclp->acl_cnt = 3;
244 ap->a_aclp->acl_entry[0].ae_tag = ACL_USER_OBJ;
245 ap->a_aclp->acl_entry[0].ae_id = ACL_UNDEFINED_ID;
246 ap->a_aclp->acl_entry[0].ae_perm = ACL_PERM_NONE;
247 ap->a_aclp->acl_entry[1].ae_tag = ACL_GROUP_OBJ;
248 ap->a_aclp->acl_entry[1].ae_id = ACL_UNDEFINED_ID;
249 ap->a_aclp->acl_entry[1].ae_perm = ACL_PERM_NONE;
250 ap->a_aclp->acl_entry[2].ae_tag = ACL_OTHER;
251 ap->a_aclp->acl_entry[2].ae_id = ACL_UNDEFINED_ID;
252 ap->a_aclp->acl_entry[2].ae_perm = ACL_PERM_NONE;
253 break;
254
255 case ACL_TYPE_DEFAULT:
256 ap->a_aclp->acl_cnt = 0;
257 break;
258 }
259 } else if (error != 0)
260 goto out;
261
262 if (!error) {
263 error = ext4_acl_from_disk(value, len, ap->a_aclp);
264 if (error)
265 goto out;
266 }
267
268 if (error == ENOATTR)
269 error = 0;
270
271 if (ap->a_type == ACL_TYPE_ACCESS)
272 ext2_sync_acl_from_inode(VTOI(ap->a_vp), ap->a_aclp);
273
274 out:
275 free(value, M_TEMP);
276 return (error);
277 }
278
279 int
280 ext2_getacl(struct vop_getacl_args *ap)
281 {
282
283 if (((ap->a_vp->v_mount->mnt_flag & MNT_ACLS) == 0) ||
284 ((ap->a_vp->v_mount->mnt_flag & MNT_NFS4ACLS) != 0))
285 return (EOPNOTSUPP);
286
287 if (ap->a_type == ACL_TYPE_NFS4)
288 return (ENOTSUP);
289
290 return (ext2_getacl_posix1e(ap));
291 }
292
293 /*
294 * Convert from in-memory to filesystem representation.
295 */
296 static int
297 ext4_acl_to_disk(const struct acl *acl, size_t *size, char *value)
298 {
299 struct ext2_acl_header *ext_acl;
300 int disk_size;
301 char *e;
302 size_t n;
303
304 if (acl->acl_cnt <= 4)
305 disk_size = sizeof(struct ext2_acl_header) +
306 acl->acl_cnt * sizeof(struct ext2_acl_entry_short);
307 else
308 disk_size = sizeof(struct ext2_acl_header) +
309 4 * sizeof(struct ext2_acl_entry_short) +
310 (acl->acl_cnt - 4) * sizeof(struct ext2_acl_entry);
311
312 if (disk_size > *size)
313 return (EINVAL);
314
315 *size = disk_size;
316 ext_acl = (struct ext2_acl_header *)value;
317
318 ext_acl->a_version = EXT4_ACL_VERSION;
319 e = (char *)ext_acl + sizeof(struct ext2_acl_header);
320 for (n = 0; n < acl->acl_cnt; n++) {
321 const struct acl_entry *acl_e = &acl->acl_entry[n];
322 struct ext2_acl_entry *entry = (struct ext2_acl_entry *)e;
323 entry->ae_tag = acl_e->ae_tag;
324 entry->ae_perm = acl_e->ae_perm;
325 switch (acl_e->ae_tag) {
326 case ACL_USER:
327 entry->ae_id = acl_e->ae_id;
328 e += sizeof(struct ext2_acl_entry);
329 break;
330
331 case ACL_GROUP:
332 entry->ae_id = acl_e->ae_id;
333 e += sizeof(struct ext2_acl_entry);
334 break;
335
336 case ACL_USER_OBJ:
337 case ACL_GROUP_OBJ:
338 case ACL_MASK:
339 case ACL_OTHER:
340 e += sizeof(struct ext2_acl_entry_short);
341 break;
342
343 default:
344 return (EINVAL);
345 }
346 }
347
348 return (0);
349 }
350
351 static int
352 ext2_setacl_posix1e(struct vop_setacl_args *ap)
353 {
354 struct inode *ip = VTOI(ap->a_vp);
355 char *value;
356 size_t len;
357 int error;
358
359 if ((ap->a_vp->v_mount->mnt_flag & MNT_ACLS) == 0)
360 return (EINVAL);
361
362 /*
363 * If this is a set operation rather than a delete operation,
364 * invoke VOP_ACLCHECK() on the passed ACL to determine if it is
365 * valid for the target. This will include a check on ap->a_type.
366 */
367 if (ap->a_aclp != NULL) {
368 /*
369 * Set operation.
370 */
371 error = VOP_ACLCHECK(ap->a_vp, ap->a_type, ap->a_aclp,
372 ap->a_cred, ap->a_td);
373 if (error)
374 return (error);
375 } else {
376 /*
377 * Delete operation.
378 * POSIX.1e allows only deletion of the default ACL on a
379 * directory (ACL_TYPE_DEFAULT).
380 */
381 if (ap->a_type != ACL_TYPE_DEFAULT)
382 return (EINVAL);
383 if (ap->a_vp->v_type != VDIR)
384 return (ENOTDIR);
385 }
386
387 if (ap->a_vp->v_mount->mnt_flag & MNT_RDONLY)
388 return (EROFS);
389
390 /*
391 * Authorize the ACL operation.
392 */
393 if (ip->i_flags & (IMMUTABLE | APPEND))
394 return (EPERM);
395
396 /*
397 * Must hold VADMIN (be file owner) or have appropriate privilege.
398 */
399 if ((error = VOP_ACCESS(ap->a_vp, VADMIN, ap->a_cred, ap->a_td)))
400 return (error);
401
402 switch (ap->a_type) {
403 case ACL_TYPE_ACCESS:
404 len = sizeof(*ap->a_aclp) + sizeof(struct ext2_acl_header);
405 value = malloc(len, M_ACL, M_WAITOK | M_ZERO);
406 error = ext4_acl_to_disk(ap->a_aclp, &len, value);
407 if (error == 0)
408 error = vn_extattr_set(ap->a_vp, IO_NODELOCKED,
409 POSIX1E_ACL_ACCESS_EXTATTR_NAMESPACE,
410 POSIX1E_ACL_ACCESS_EXTATTR_NAME, len,
411 value, ap->a_td);
412
413 free(value, M_ACL);
414 break;
415
416 case ACL_TYPE_DEFAULT:
417 if (ap->a_aclp == NULL) {
418 error = vn_extattr_rm(ap->a_vp, IO_NODELOCKED,
419 POSIX1E_ACL_DEFAULT_EXTATTR_NAMESPACE,
420 POSIX1E_ACL_DEFAULT_EXTATTR_NAME, ap->a_td);
421
422 /*
423 * Attempting to delete a non-present default ACL
424 * will return success for portability purposes.
425 * (TRIX)
426 *
427 * XXX: Note that since we can't distinguish
428 * "that EA is not supported" from "that EA is not
429 * defined", the success case here overlaps the
430 * the ENOATTR->EOPNOTSUPP case below.
431 */
432 if (error == ENOATTR)
433 error = 0;
434 } else {
435 len = sizeof(*ap->a_aclp) + sizeof(struct ext2_acl_header);
436 value = malloc(len, M_ACL, M_WAITOK | M_ZERO);
437 error = ext4_acl_to_disk(ap->a_aclp, &len, value);
438 if (error == 0)
439 error = vn_extattr_set(ap->a_vp, IO_NODELOCKED,
440 POSIX1E_ACL_DEFAULT_EXTATTR_NAMESPACE,
441 POSIX1E_ACL_DEFAULT_EXTATTR_NAME, len,
442 value, ap->a_td);
443
444 free(value, M_ACL);
445 }
446 break;
447
448 default:
449 error = EINVAL;
450 }
451
452 /*
453 * Map lack of attribute definition in UFS_EXTATTR into lack of
454 * support for ACLs on the filesystem.
455 */
456 if (error == ENOATTR)
457 return (EOPNOTSUPP);
458
459 if (error != 0)
460 return (error);
461
462 if (ap->a_type == ACL_TYPE_ACCESS) {
463 /*
464 * Now that the EA is successfully updated, update the
465 * inode and mark it as changed.
466 */
467 ext2_sync_inode_from_acl(ap->a_aclp, ip);
468 ip->i_flag |= IN_CHANGE;
469 error = ext2_update(ip->i_vnode, 1);
470 }
471
472 VN_KNOTE_UNLOCKED(ap->a_vp, NOTE_ATTRIB);
473
474 return (error);
475 }
476
477 int
478 ext2_setacl(struct vop_setacl_args *ap)
479 {
480 if (((ap->a_vp->v_mount->mnt_flag & MNT_ACLS) == 0) ||
481 ((ap->a_vp->v_mount->mnt_flag & MNT_NFS4ACLS) != 0))
482 return (EOPNOTSUPP);
483
484 if (ap->a_type == ACL_TYPE_NFS4)
485 return (ENOTSUP);
486
487 return (ext2_setacl_posix1e(ap));
488 }
489
490 /*
491 * Check the validity of an ACL for a file.
492 */
493 int
494 ext2_aclcheck(struct vop_aclcheck_args *ap)
495 {
496
497 if (((ap->a_vp->v_mount->mnt_flag & MNT_ACLS) == 0) ||
498 ((ap->a_vp->v_mount->mnt_flag & MNT_NFS4ACLS) != 0))
499 return (EOPNOTSUPP);
500
501 if (ap->a_type == ACL_TYPE_NFS4)
502 return (ENOTSUP);
503
504 if ((ap->a_vp->v_mount->mnt_flag & MNT_ACLS) == 0)
505 return (EINVAL);
506
507 /*
508 * Verify we understand this type of ACL, and that it applies
509 * to this kind of object.
510 * Rely on the acl_posix1e_check() routine to verify the contents.
511 */
512 switch (ap->a_type) {
513 case ACL_TYPE_ACCESS:
514 break;
515
516 case ACL_TYPE_DEFAULT:
517 if (ap->a_vp->v_type != VDIR)
518 return (EINVAL);
519 break;
520
521 default:
522 return (EINVAL);
523 }
524
525 return (acl_posix1e_check(ap->a_aclp));
526 }
527
528 #endif /* UFS_ACL */
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