1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 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/types.h> 30 #include "namespace.h" 31 #include <sys/acl.h> 32 #include "un-namespace.h" 33 34 #include <errno.h> 35 #include <string.h> 36 37 static int 38 _perm_is_invalid(acl_perm_t perm) 39 { 40 41 /* Check if more than a single bit is set. */ 42 if ((perm & -perm) == perm && 43 (perm & (ACL_POSIX1E_BITS | ACL_NFS4_PERM_BITS)) == perm) 44 return (0); 45 46 errno = EINVAL; 47 48 return (1); 49 } 50 51 /* 52 * acl_add_perm() (23.4.1): add the permission contained in perm to the 53 * permission set permset_d 54 */ 55 int 56 acl_add_perm(acl_permset_t permset_d, acl_perm_t perm) 57 { 58 59 if (permset_d == NULL) { 60 errno = EINVAL; 61 return (-1); 62 } 63 64 if (_perm_is_invalid(perm)) 65 return (-1); 66 67 *permset_d |= perm; 68 69 return (0); 70 } 71 72 /* 73 * acl_clear_perms() (23.4.3): clear all permisions from the permission 74 * set permset_d 75 */ 76 int 77 acl_clear_perms(acl_permset_t permset_d) 78 { 79 80 if (permset_d == NULL) { 81 errno = EINVAL; 82 return (-1); 83 } 84 85 *permset_d = ACL_PERM_NONE; 86 87 return (0); 88 } 89 90 /* 91 * acl_delete_perm() (23.4.10): remove the permission in perm from the 92 * permission set permset_d 93 */ 94 int 95 acl_delete_perm(acl_permset_t permset_d, acl_perm_t perm) 96 { 97 98 if (permset_d == NULL) { 99 errno = EINVAL; 100 return (-1); 101 } 102 103 if (_perm_is_invalid(perm)) 104 return (-1); 105 106 *permset_d &= ~perm; 107 108 return (0); 109 } 110 111 int 112 acl_get_perm_np(acl_permset_t permset_d, acl_perm_t perm) 113 { 114 115 if (permset_d == NULL) { 116 errno = EINVAL; 117 return (-1); 118 } 119 120 if (_perm_is_invalid(perm)) 121 return (-1); 122 123 if (*permset_d & perm) 124 return (1); 125 126 return (0); 127 } 128