120 lines
3.5 KiB
C
120 lines
3.5 KiB
C
/*
|
|
* Copyright (c) 2001-2002 Chris D. Faulhaber
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR THE VOICES IN HIS HEAD BE
|
|
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
|
|
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
|
|
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
|
|
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
|
|
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
|
|
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
|
* POSSIBILITY OF SUCH DAMAGE.
|
|
*/
|
|
|
|
#include <sys/cdefs.h>
|
|
__FBSDID("$FreeBSD$");
|
|
|
|
#include <sys/types.h>
|
|
#include "namespace.h"
|
|
#include <sys/acl.h>
|
|
#include "un-namespace.h"
|
|
|
|
#include <errno.h>
|
|
#include <stdio.h>
|
|
|
|
/*
|
|
* acl_calc_mask() (23.4.2): calculate and set the permissions
|
|
* associated with the ACL_MASK ACL entry. If the ACL already
|
|
* contains an ACL_MASK entry, its permissions shall be
|
|
* overwritten; if not, one shall be added.
|
|
*/
|
|
int
|
|
acl_calc_mask(acl_t *acl_p)
|
|
{
|
|
struct acl *acl_int, *acl_int_new;
|
|
acl_t acl_new;
|
|
int i, mask_mode, mask_num;
|
|
|
|
/*
|
|
* (23.4.2.4) requires acl_p to point to a pointer to a valid ACL.
|
|
* Since one of the primary reasons to use this function would be
|
|
* to calculate the appropriate mask to obtain a valid ACL, we only
|
|
* perform sanity checks here and validate the ACL prior to
|
|
* returning.
|
|
*/
|
|
if (acl_p == NULL || *acl_p == NULL) {
|
|
errno = EINVAL;
|
|
return (-1);
|
|
}
|
|
acl_int = &(*acl_p)->ats_acl;
|
|
if ((acl_int->acl_cnt < 3) || (acl_int->acl_cnt > ACL_MAX_ENTRIES)) {
|
|
errno = EINVAL;
|
|
return (-1);
|
|
}
|
|
|
|
acl_new = acl_dup(*acl_p);
|
|
if (acl_new == NULL)
|
|
return (-1);
|
|
acl_int_new = &acl_new->ats_acl;
|
|
|
|
mask_mode = 0;
|
|
mask_num = -1;
|
|
|
|
/* gather permissions and find a mask entry */
|
|
for (i = 0; i < acl_int_new->acl_cnt; i++) {
|
|
switch(acl_int_new->acl_entry[i].ae_tag) {
|
|
case ACL_USER:
|
|
case ACL_GROUP:
|
|
case ACL_GROUP_OBJ:
|
|
mask_mode |=
|
|
acl_int_new->acl_entry[i].ae_perm & ACL_PERM_BITS;
|
|
break;
|
|
case ACL_MASK:
|
|
mask_num = i;
|
|
break;
|
|
}
|
|
}
|
|
|
|
/* if a mask entry already exists, overwrite the perms */
|
|
if (mask_num != -1)
|
|
acl_int_new->acl_entry[mask_num].ae_perm = mask_mode;
|
|
else {
|
|
/* if no mask exists, check acl_cnt... */
|
|
if (acl_int_new->acl_cnt == ACL_MAX_ENTRIES) {
|
|
errno = ENOMEM;
|
|
return (-1);
|
|
}
|
|
/* ...and add the mask entry */
|
|
acl_int_new->acl_entry[acl_int_new->acl_cnt].ae_tag = ACL_MASK;
|
|
acl_int_new->acl_entry[acl_int_new->acl_cnt].ae_id =
|
|
ACL_UNDEFINED_ID;
|
|
acl_int_new->acl_entry[acl_int_new->acl_cnt].ae_perm =
|
|
mask_mode;
|
|
acl_int_new->acl_cnt++;
|
|
}
|
|
|
|
if (acl_valid(acl_new) == -1) {
|
|
errno = EINVAL;
|
|
acl_free(acl_new);
|
|
return (-1);
|
|
}
|
|
|
|
**acl_p = *acl_new;
|
|
acl_free(acl_new);
|
|
|
|
return (0);
|
|
}
|