2 * SPDX-License-Identifier: BSD-2-Clause
4 * Copyright (c) 2017, Fedor Uporov
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
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.
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
29 #include <sys/param.h>
30 #include <sys/systm.h>
31 #include <sys/types.h>
33 #include <sys/kernel.h>
34 #include <sys/malloc.h>
35 #include <sys/vnode.h>
38 #include <sys/endian.h>
40 #include <sys/mount.h>
41 #include <sys/extattr.h>
43 #include <fs/ext2fs/fs.h>
44 #include <fs/ext2fs/ext2fs.h>
45 #include <fs/ext2fs/inode.h>
46 #include <fs/ext2fs/ext2_acl.h>
47 #include <fs/ext2fs/ext2_extattr.h>
48 #include <fs/ext2fs/ext2_extern.h>
49 #include <fs/ext2fs/ext2_dinode.h>
50 #include <fs/ext2fs/ext2_mount.h>
55 ext2_sync_acl_from_inode(struct inode *ip, struct acl *acl)
57 struct acl_entry *acl_mask, *acl_group_obj;
61 * Update ACL_USER_OBJ, ACL_OTHER, but simply identify ACL_MASK
62 * and ACL_GROUP_OBJ for use after we know whether ACL_MASK is
67 for (i = 0; i < acl->acl_cnt; i++) {
68 switch (acl->acl_entry[i].ae_tag) {
70 acl->acl_entry[i].ae_perm = acl_posix1e_mode_to_perm(
71 ACL_USER_OBJ, ip->i_mode);
72 acl->acl_entry[i].ae_id = ACL_UNDEFINED_ID;
76 acl_group_obj = &acl->acl_entry[i];
77 acl->acl_entry[i].ae_id = ACL_UNDEFINED_ID;
81 acl->acl_entry[i].ae_perm = acl_posix1e_mode_to_perm(
82 ACL_OTHER, ip->i_mode);
83 acl->acl_entry[i].ae_id = ACL_UNDEFINED_ID;
87 acl_mask = &acl->acl_entry[i];
88 acl->acl_entry[i].ae_id = ACL_UNDEFINED_ID;
96 panic("ext2_sync_acl_from_inode(): bad ae_tag");
100 if (acl_group_obj == NULL)
101 panic("ext2_sync_acl_from_inode(): no ACL_GROUP_OBJ");
103 if (acl_mask == NULL) {
105 * There is no ACL_MASK, so update ACL_GROUP_OBJ.
107 acl_group_obj->ae_perm = acl_posix1e_mode_to_perm(
108 ACL_GROUP_OBJ, ip->i_mode);
111 * Update the ACL_MASK entry instead of ACL_GROUP_OBJ.
113 acl_mask->ae_perm = acl_posix1e_mode_to_perm(ACL_GROUP_OBJ,
119 ext2_sync_inode_from_acl(struct acl *acl, struct inode *ip)
122 ip->i_mode &= ACL_PRESERVE_MASK;
123 ip->i_mode |= acl_posix1e_acl_to_mode(acl);
127 * Convert from filesystem to in-memory representation.
130 ext4_acl_from_disk(char *value, size_t size, struct acl *acl)
140 if (((struct ext2_acl_header *)value)->a_version != EXT4_ACL_VERSION)
143 if (size < sizeof(struct ext2_acl_header))
146 s = size - sizeof(struct ext2_acl_header);
147 s -= 4 * sizeof(struct ext2_acl_entry_short);
149 if ((size - sizeof(struct ext2_acl_header)) %
150 sizeof(struct ext2_acl_entry_short))
153 count = (size - sizeof(struct ext2_acl_header)) /
154 sizeof(struct ext2_acl_entry_short);
156 if (s % sizeof(struct ext2_acl_entry))
159 count = s / sizeof(struct ext2_acl_entry) + 4;
161 if (count <= 0 || count > acl->acl_maxcnt)
164 value = value + sizeof(struct ext2_acl_header);
166 for (n = 0; n < count; n++) {
167 struct ext2_acl_entry *entry = (struct ext2_acl_entry *)value;
168 if ((char *)value + sizeof(struct ext2_acl_entry_short) > end)
171 acl->acl_entry[n].ae_tag = entry->ae_tag;
172 acl->acl_entry[n].ae_perm = entry->ae_perm;
174 switch (acl->acl_entry[n].ae_tag) {
179 value = (char *)value + sizeof(struct ext2_acl_entry_short);
183 value = (char *)value + sizeof(struct ext2_acl_entry);
184 if ((char *)value > end)
187 acl->acl_entry[n].ae_id = entry->ae_id;
191 value = (char *)value + sizeof(struct ext2_acl_entry);
192 if ((char *)value > end)
195 acl->acl_entry[n].ae_id = entry->ae_id;
206 acl->acl_cnt = count;
212 ext2_getacl_posix1e(struct vop_getacl_args *ap)
215 const char *attrname;
220 switch (ap->a_type) {
221 case ACL_TYPE_DEFAULT:
222 attrnamespace = POSIX1E_ACL_DEFAULT_EXTATTR_NAMESPACE;
223 attrname = POSIX1E_ACL_DEFAULT_EXTATTR_NAME;
225 case ACL_TYPE_ACCESS:
226 attrnamespace = POSIX1E_ACL_ACCESS_EXTATTR_NAMESPACE;
227 attrname = POSIX1E_ACL_ACCESS_EXTATTR_NAME;
233 len = sizeof(*ap->a_aclp) + sizeof(struct ext2_acl_header);
234 value = malloc(len, M_ACL, M_WAITOK);
236 error = vn_extattr_get(ap->a_vp, IO_NODELOCKED, attrnamespace, attrname,
237 &len, value, ap->a_td);
238 if (error == ENOATTR) {
239 switch (ap->a_type) {
240 case ACL_TYPE_ACCESS:
241 ap->a_aclp->acl_cnt = 3;
242 ap->a_aclp->acl_entry[0].ae_tag = ACL_USER_OBJ;
243 ap->a_aclp->acl_entry[0].ae_id = ACL_UNDEFINED_ID;
244 ap->a_aclp->acl_entry[0].ae_perm = ACL_PERM_NONE;
245 ap->a_aclp->acl_entry[1].ae_tag = ACL_GROUP_OBJ;
246 ap->a_aclp->acl_entry[1].ae_id = ACL_UNDEFINED_ID;
247 ap->a_aclp->acl_entry[1].ae_perm = ACL_PERM_NONE;
248 ap->a_aclp->acl_entry[2].ae_tag = ACL_OTHER;
249 ap->a_aclp->acl_entry[2].ae_id = ACL_UNDEFINED_ID;
250 ap->a_aclp->acl_entry[2].ae_perm = ACL_PERM_NONE;
253 case ACL_TYPE_DEFAULT:
254 ap->a_aclp->acl_cnt = 0;
257 } else if (error != 0)
261 error = ext4_acl_from_disk(value, len, ap->a_aclp);
266 if (error == ENOATTR)
269 if (ap->a_type == ACL_TYPE_ACCESS)
270 ext2_sync_acl_from_inode(VTOI(ap->a_vp), ap->a_aclp);
278 ext2_getacl(struct vop_getacl_args *ap)
281 if (((ap->a_vp->v_mount->mnt_flag & MNT_ACLS) == 0) ||
282 ((ap->a_vp->v_mount->mnt_flag & MNT_NFS4ACLS) != 0))
285 if (ap->a_type == ACL_TYPE_NFS4)
288 return (ext2_getacl_posix1e(ap));
292 * Convert from in-memory to filesystem representation.
295 ext4_acl_to_disk(const struct acl *acl, size_t *size, char *value)
297 struct ext2_acl_header *ext_acl;
302 if (acl->acl_cnt <= 4)
303 disk_size = sizeof(struct ext2_acl_header) +
304 acl->acl_cnt * sizeof(struct ext2_acl_entry_short);
306 disk_size = sizeof(struct ext2_acl_header) +
307 4 * sizeof(struct ext2_acl_entry_short) +
308 (acl->acl_cnt - 4) * sizeof(struct ext2_acl_entry);
310 if (disk_size > *size)
314 ext_acl = (struct ext2_acl_header *)value;
316 ext_acl->a_version = EXT4_ACL_VERSION;
317 e = (char *)ext_acl + sizeof(struct ext2_acl_header);
318 for (n = 0; n < acl->acl_cnt; n++) {
319 const struct acl_entry *acl_e = &acl->acl_entry[n];
320 struct ext2_acl_entry *entry = (struct ext2_acl_entry *)e;
321 entry->ae_tag = acl_e->ae_tag;
322 entry->ae_perm = acl_e->ae_perm;
323 switch (acl_e->ae_tag) {
325 entry->ae_id = acl_e->ae_id;
326 e += sizeof(struct ext2_acl_entry);
330 entry->ae_id = acl_e->ae_id;
331 e += sizeof(struct ext2_acl_entry);
338 e += sizeof(struct ext2_acl_entry_short);
350 ext2_setacl_posix1e(struct vop_setacl_args *ap)
352 struct inode *ip = VTOI(ap->a_vp);
357 if ((ap->a_vp->v_mount->mnt_flag & MNT_ACLS) == 0)
361 * If this is a set operation rather than a delete operation,
362 * invoke VOP_ACLCHECK() on the passed ACL to determine if it is
363 * valid for the target. This will include a check on ap->a_type.
365 if (ap->a_aclp != NULL) {
369 error = VOP_ACLCHECK(ap->a_vp, ap->a_type, ap->a_aclp,
370 ap->a_cred, ap->a_td);
376 * POSIX.1e allows only deletion of the default ACL on a
377 * directory (ACL_TYPE_DEFAULT).
379 if (ap->a_type != ACL_TYPE_DEFAULT)
381 if (ap->a_vp->v_type != VDIR)
385 if (ap->a_vp->v_mount->mnt_flag & MNT_RDONLY)
389 * Authorize the ACL operation.
391 if (ip->i_flags & (IMMUTABLE | APPEND))
395 * Must hold VADMIN (be file owner) or have appropriate privilege.
397 if ((error = VOP_ACCESS(ap->a_vp, VADMIN, ap->a_cred, ap->a_td)))
400 switch (ap->a_type) {
401 case ACL_TYPE_ACCESS:
402 len = sizeof(*ap->a_aclp) + sizeof(struct ext2_acl_header);
403 value = malloc(len, M_ACL, M_WAITOK | M_ZERO);
404 error = ext4_acl_to_disk(ap->a_aclp, &len, value);
406 error = vn_extattr_set(ap->a_vp, IO_NODELOCKED,
407 POSIX1E_ACL_ACCESS_EXTATTR_NAMESPACE,
408 POSIX1E_ACL_ACCESS_EXTATTR_NAME, len,
414 case ACL_TYPE_DEFAULT:
415 if (ap->a_aclp == NULL) {
416 error = vn_extattr_rm(ap->a_vp, IO_NODELOCKED,
417 POSIX1E_ACL_DEFAULT_EXTATTR_NAMESPACE,
418 POSIX1E_ACL_DEFAULT_EXTATTR_NAME, ap->a_td);
421 * Attempting to delete a non-present default ACL
422 * will return success for portability purposes.
425 * XXX: Note that since we can't distinguish
426 * "that EA is not supported" from "that EA is not
427 * defined", the success case here overlaps the
428 * the ENOATTR->EOPNOTSUPP case below.
430 if (error == ENOATTR)
433 len = sizeof(*ap->a_aclp) + sizeof(struct ext2_acl_header);
434 value = malloc(len, M_ACL, M_WAITOK | M_ZERO);
435 error = ext4_acl_to_disk(ap->a_aclp, &len, value);
437 error = vn_extattr_set(ap->a_vp, IO_NODELOCKED,
438 POSIX1E_ACL_DEFAULT_EXTATTR_NAMESPACE,
439 POSIX1E_ACL_DEFAULT_EXTATTR_NAME, len,
451 * Map lack of attribute definition in UFS_EXTATTR into lack of
452 * support for ACLs on the filesystem.
454 if (error == ENOATTR)
460 if (ap->a_type == ACL_TYPE_ACCESS) {
462 * Now that the EA is successfully updated, update the
463 * inode and mark it as changed.
465 ext2_sync_inode_from_acl(ap->a_aclp, ip);
466 ip->i_flag |= IN_CHANGE;
467 error = ext2_update(ip->i_vnode, 1);
470 VN_KNOTE_UNLOCKED(ap->a_vp, NOTE_ATTRIB);
476 ext2_setacl(struct vop_setacl_args *ap)
478 if (((ap->a_vp->v_mount->mnt_flag & MNT_ACLS) == 0) ||
479 ((ap->a_vp->v_mount->mnt_flag & MNT_NFS4ACLS) != 0))
482 if (ap->a_type == ACL_TYPE_NFS4)
485 return (ext2_setacl_posix1e(ap));
489 * Check the validity of an ACL for a file.
492 ext2_aclcheck(struct vop_aclcheck_args *ap)
495 if (((ap->a_vp->v_mount->mnt_flag & MNT_ACLS) == 0) ||
496 ((ap->a_vp->v_mount->mnt_flag & MNT_NFS4ACLS) != 0))
499 if (ap->a_type == ACL_TYPE_NFS4)
502 if ((ap->a_vp->v_mount->mnt_flag & MNT_ACLS) == 0)
506 * Verify we understand this type of ACL, and that it applies
507 * to this kind of object.
508 * Rely on the acl_posix1e_check() routine to verify the contents.
510 switch (ap->a_type) {
511 case ACL_TYPE_ACCESS:
514 case ACL_TYPE_DEFAULT:
515 if (ap->a_vp->v_type != VDIR)
523 return (acl_posix1e_check(ap->a_aclp));