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 __FBSDID("$FreeBSD$"); 31 32 #include <sys/types.h> 33 #include "namespace.h" 34 #include <sys/acl.h> 35 #include "un-namespace.h" 36 37 #include <errno.h> 38 #include <string.h> 39 40 static int 41 _perm_is_invalid(acl_perm_t perm) 42 { 43 44 /* Check if more than a single bit is set. */ 45 if ((perm & -perm) == perm && 46 (perm & (ACL_POSIX1E_BITS | ACL_NFS4_PERM_BITS)) == perm) 47 return (0); 48 49 errno = EINVAL; 50 51 return (1); 52 } 53 54 /* 55 * acl_add_perm() (23.4.1): add the permission contained in perm to the 56 * permission set permset_d 57 */ 58 int 59 acl_add_perm(acl_permset_t permset_d, acl_perm_t perm) 60 { 61 62 if (permset_d == NULL) { 63 errno = EINVAL; 64 return (-1); 65 } 66 67 if (_perm_is_invalid(perm)) 68 return (-1); 69 70 *permset_d |= perm; 71 72 return (0); 73 } 74 75 /* 76 * acl_clear_perms() (23.4.3): clear all permisions from the permission 77 * set permset_d 78 */ 79 int 80 acl_clear_perms(acl_permset_t permset_d) 81 { 82 83 if (permset_d == NULL) { 84 errno = EINVAL; 85 return (-1); 86 } 87 88 *permset_d = ACL_PERM_NONE; 89 90 return (0); 91 } 92 93 /* 94 * acl_delete_perm() (23.4.10): remove the permission in perm from the 95 * permission set permset_d 96 */ 97 int 98 acl_delete_perm(acl_permset_t permset_d, acl_perm_t perm) 99 { 100 101 if (permset_d == NULL) { 102 errno = EINVAL; 103 return (-1); 104 } 105 106 if (_perm_is_invalid(perm)) 107 return (-1); 108 109 *permset_d &= ~perm; 110 111 return (0); 112 } 113 114 int 115 acl_get_perm_np(acl_permset_t permset_d, acl_perm_t perm) 116 { 117 118 if (permset_d == NULL) { 119 errno = EINVAL; 120 return (-1); 121 } 122 123 if (_perm_is_invalid(perm)) 124 return (-1); 125 126 if (*permset_d & perm) 127 return (1); 128 129 return (0); 130 } 131