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59831d7595
and acl_calc_mask(3) return error instead of crashing when acl passed to them is NULL. Submitted by: markus Reviewed by: rwatson MFC after: 3 days
129 lines
3.6 KiB
C
129 lines
3.6 KiB
C
/*
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* Copyright (c) 2001-2002 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 AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/types.h>
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#include "namespace.h"
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#include <sys/acl.h>
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#include "un-namespace.h"
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#include <errno.h>
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#include <stdio.h>
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#include "acl_support.h"
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/*
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* acl_calc_mask() (23.4.2): calculate and set the permissions
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* associated with the ACL_MASK ACL entry. If the ACL already
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* contains an ACL_MASK entry, its permissions shall be
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* overwritten; if not, 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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struct acl *acl_int, *acl_int_new;
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acl_t acl_new;
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int i, mask_mode, mask_num;
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/*
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* (23.4.2.4) requires acl_p to point to a pointer to a valid ACL.
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* Since one of the primary reasons to use this function would be
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* to calculate the appropriate mask to obtain a valid ACL, we only
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* perform sanity checks here and validate the ACL prior to
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* returning.
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*/
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if (acl_p == NULL || *acl_p == NULL) {
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errno = EINVAL;
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return (-1);
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}
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if (!_acl_brand_may_be(*acl_p, ACL_BRAND_POSIX)) {
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errno = EINVAL;
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return (-1);
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}
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_acl_brand_as(*acl_p, ACL_BRAND_POSIX);
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acl_int = &(*acl_p)->ats_acl;
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if ((acl_int->acl_cnt < 3) || (acl_int->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 == NULL)
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return (-1);
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acl_int_new = &acl_new->ats_acl;
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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_int_new->acl_cnt; i++) {
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switch(acl_int_new->acl_entry[i].ae_tag) {
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case ACL_USER:
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case ACL_GROUP:
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case ACL_GROUP_OBJ:
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mask_mode |=
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acl_int_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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}
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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_int_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_int_new->acl_cnt == ACL_MAX_ENTRIES) {
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errno = ENOMEM;
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return (-1);
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}
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/* ...and add the mask entry */
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acl_int_new->acl_entry[acl_int_new->acl_cnt].ae_tag = ACL_MASK;
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acl_int_new->acl_entry[acl_int_new->acl_cnt].ae_id =
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ACL_UNDEFINED_ID;
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acl_int_new->acl_entry[acl_int_new->acl_cnt].ae_perm =
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mask_mode;
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acl_int_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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