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 1.1 2020/05/16 18:31:47 christos 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 permisions 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