2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
4 * Copyright (c) 2001-2002 Chris D. Faulhaber
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 AUTHOR 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 AUTHOR 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/cdefs.h>
30 __FBSDID("$FreeBSD$");
32 #include <sys/types.h>
33 #include "namespace.h"
35 #include "un-namespace.h"
40 #include "acl_support.h"
43 * acl_calc_mask() (23.4.2): calculate and set the permissions
44 * associated with the ACL_MASK ACL entry. If the ACL already
45 * contains an ACL_MASK entry, its permissions shall be
46 * overwritten; if not, one shall be added.
49 acl_calc_mask(acl_t *acl_p)
51 struct acl *acl_int, *acl_int_new;
53 int i, mask_mode, mask_num;
56 * (23.4.2.4) requires acl_p to point to a pointer to a valid ACL.
57 * Since one of the primary reasons to use this function would be
58 * to calculate the appropriate mask to obtain a valid ACL, we only
59 * perform sanity checks here and validate the ACL prior to
62 if (acl_p == NULL || *acl_p == NULL) {
67 if (!_acl_brand_may_be(*acl_p, ACL_BRAND_POSIX)) {
71 _acl_brand_as(*acl_p, ACL_BRAND_POSIX);
73 acl_int = &(*acl_p)->ats_acl;
74 if ((acl_int->acl_cnt < 3) || (acl_int->acl_cnt > ACL_MAX_ENTRIES)) {
79 acl_new = acl_dup(*acl_p);
82 acl_int_new = &acl_new->ats_acl;
87 /* gather permissions and find a mask entry */
88 for (i = 0; i < acl_int_new->acl_cnt; i++) {
89 switch(acl_int_new->acl_entry[i].ae_tag) {
94 acl_int_new->acl_entry[i].ae_perm & ACL_PERM_BITS;
102 /* if a mask entry already exists, overwrite the perms */
104 acl_int_new->acl_entry[mask_num].ae_perm = mask_mode;
106 /* if no mask exists, check acl_cnt... */
107 if (acl_int_new->acl_cnt == ACL_MAX_ENTRIES) {
112 /* ...and add the mask entry */
113 acl_int_new->acl_entry[acl_int_new->acl_cnt].ae_tag = ACL_MASK;
114 acl_int_new->acl_entry[acl_int_new->acl_cnt].ae_id =
116 acl_int_new->acl_entry[acl_int_new->acl_cnt].ae_perm =
118 acl_int_new->acl_cnt++;
121 if (acl_valid(acl_new) == -1) {