120 lines
3.3 KiB
C
120 lines
3.3 KiB
C
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/*
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* Copyright (c) 2001 Chris D. Faulhaber
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR THE VOICES IN HIS HEAD BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#include <sys/types.h>
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#include <sys/acl.h>
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#include <errno.h>
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/*
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* acl_calc_mask() calculates and set the permissions associated
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* with the ACL_MASK ACL entry. If the ACL already contains an
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* ACL_MASK entry, its permissions shall be overwritten; if not,
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* one shall be added.
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*/
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int
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acl_calc_mask(acl_t *acl_p)
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{
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acl_t acl_new;
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int group_obj, i, mask_mode, mask_num, other_obj, user_obj;
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/* check args */
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if (!acl_p || !*acl_p || ((*acl_p)->acl_cnt < 3) ||
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((*acl_p)->acl_cnt > ACL_MAX_ENTRIES)) {
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errno = EINVAL;
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return -1;
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}
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acl_new = acl_dup(*acl_p);
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if (!acl_new)
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return -1;
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user_obj = group_obj = other_obj = mask_mode = 0;
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mask_num = -1;
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/* gather permissions and find a mask entry */
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for (i = 0; i < acl_new->acl_cnt; i++) {
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switch(acl_new->acl_entry[i].ae_tag) {
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case ACL_USER_OBJ:
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user_obj++;
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break;
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case ACL_OTHER:
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other_obj++;
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break;
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case ACL_GROUP_OBJ:
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group_obj++;
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/* FALLTHROUGH */
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case ACL_GROUP:
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case ACL_USER:
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mask_mode |=
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acl_new->acl_entry[i].ae_perm & ACL_PERM_BITS;
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break;
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case ACL_MASK:
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mask_num = i;
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break;
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default:
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errno = EINVAL;
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acl_free(acl_new);
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return -1;
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/* NOTREACHED */
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}
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}
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if ((user_obj != 1) || (group_obj != 1) || (other_obj != 1)) {
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errno = EINVAL;
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acl_free(acl_new);
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return -1;
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}
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/* if a mask entry already exists, overwrite the perms */
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if (mask_num != -1) {
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acl_new->acl_entry[mask_num].ae_perm = mask_mode;
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} else {
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/* if no mask exists, check acl_cnt... */
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if (acl_new->acl_cnt == ACL_MAX_ENTRIES) {
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errno = EINVAL;
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acl_free(acl_new);
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return -1;
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}
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/* ...and add the mask entry */
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acl_new->acl_entry[acl_new->acl_cnt].ae_tag = ACL_MASK;
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acl_new->acl_entry[acl_new->acl_cnt].ae_id = 0;
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acl_new->acl_entry[acl_new->acl_cnt].ae_perm = mask_mode;
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acl_new->acl_cnt++;
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}
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if (acl_valid(acl_new) == -1) {
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errno = EINVAL;
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acl_free(acl_new);
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return -1;
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}
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**acl_p = *acl_new;
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acl_free(acl_new);
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return 0;
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}
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