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      1 /*-
      2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
      3  *
      4  * Copyright (c) 2001-2002 Chris D. Faulhaber
      5  * All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     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.
     15  *
     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
     26  * SUCH DAMAGE.
     27  */
     28 
     29 #include <sys/cdefs.h>
     30 #if 0
     31 __FBSDID("$FreeBSD: head/lib/libc/posix1e/acl_perm.c 326193 2017-11-25 17:12:48Z pfg $");
     32 #else
     33 __RCSID("$NetBSD: acl_perm.c,v 1.2 2025/06/05 11:30:23 andvar Exp $");
     34 #endif
     35 
     36 #include "namespace.h"
     37 #include <sys/types.h>
     38 #include <sys/acl.h>
     39 
     40 #include <errno.h>
     41 #include <string.h>
     42 
     43 static int
     44 _perm_is_invalid(acl_perm_t perm)
     45 {
     46 
     47 	/* Check if more than a single bit is set. */
     48 	if ((perm & -perm) == perm &&
     49 	    (perm & (ACL_POSIX1E_BITS | ACL_NFS4_PERM_BITS)) == perm)
     50 		return (0);
     51 
     52 	errno = EINVAL;
     53 
     54 	return (1);
     55 }
     56 
     57 /*
     58  * acl_add_perm() (23.4.1): add the permission contained in perm to the
     59  * permission set permset_d
     60  */
     61 int
     62 acl_add_perm(acl_permset_t permset_d, acl_perm_t perm)
     63 {
     64 
     65 	if (permset_d == NULL) {
     66 		errno = EINVAL;
     67 		return (-1);
     68 	}
     69 
     70 	if (_perm_is_invalid(perm))
     71 		return (-1);
     72 
     73 	*permset_d |= perm;
     74 
     75 	return (0);
     76 }
     77 
     78 /*
     79  * acl_clear_perms() (23.4.3): clear all permissions from the permission
     80  * set permset_d
     81  */
     82 int
     83 acl_clear_perms(acl_permset_t permset_d)
     84 {
     85 
     86 	if (permset_d == NULL) {
     87 		errno = EINVAL;
     88 		return (-1);
     89 	}
     90 
     91 	*permset_d = ACL_PERM_NONE;
     92 
     93 	return (0);
     94 }
     95 
     96 /*
     97  * acl_delete_perm() (23.4.10): remove the permission in perm from the
     98  * permission set permset_d
     99  */
    100 int
    101 acl_delete_perm(acl_permset_t permset_d, acl_perm_t perm)
    102 {
    103 
    104 	if (permset_d == NULL) {
    105 		errno = EINVAL;
    106 		return (-1);
    107 	}
    108 
    109 	if (_perm_is_invalid(perm))
    110 		return (-1);
    111 
    112 	*permset_d &= ~perm;
    113 
    114 	return (0);
    115 }
    116 
    117 int
    118 acl_get_perm_np(acl_permset_t permset_d, acl_perm_t perm)
    119 {
    120 
    121 	if (permset_d == NULL) {
    122 		errno = EINVAL;
    123 		return (-1);
    124 	}
    125 
    126 	if (_perm_is_invalid(perm))
    127 		return (-1);
    128 
    129 	if (*permset_d & perm)
    130 		return (1);
    131 
    132 	return (0);
    133 }
    134