1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 2008, 2009 Edward Tomasz Napierała <trasz@FreeBSD.org> 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 THE 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_branding.c 326193 2017-11-25 17:12:48Z pfg $"); 32 #else 33 __RCSID("$NetBSD: acl_branding.c,v 1.1 2020/05/16 18:31:47 christos Exp $"); 34 #endif 35 36 #include <assert.h> 37 #include <errno.h> 38 #include <sys/acl.h> 39 40 #include "acl_support.h" 41 42 /* 43 * An ugly detail of the implementation - fortunately not visible 44 * to the API users - is the "branding": libc needs to keep track 45 * of what "brand" ACL is: NFSv4, POSIX.1e or unknown. It happens 46 * automatically - for example, during acl_get_file(3) ACL gets 47 * branded according to the "type" argument; during acl_set_permset 48 * ACL, if its brand is unknown it gets branded as NFSv4 if any of the 49 * NFSv4 permissions that are not valid for POSIX.1e ACL are set etc. 50 * Branding information is used for printing out the ACL (acl_to_text(3)), 51 * veryfying acl_set_whatever arguments (checking against setting 52 * bits that are valid only for NFSv4 in ACL branded as POSIX.1e) etc. 53 */ 54 55 static acl_t 56 entry2acl(acl_entry_t entry) 57 { 58 acl_t aclp; 59 60 aclp = (acl_t)(((long)entry >> _ACL_T_ALIGNMENT_BITS) << _ACL_T_ALIGNMENT_BITS); 61 62 return (aclp); 63 } 64 65 /* 66 * Return brand of an ACL. 67 */ 68 int 69 _acl_brand(const acl_t acl) 70 { 71 72 return (acl->ats_brand); 73 } 74 75 int 76 _entry_brand(const acl_entry_t entry) 77 { 78 79 return (_acl_brand(entry2acl(entry))); 80 } 81 82 /* 83 * Return 1, iff branding ACL as "brand" is ok. 84 */ 85 int 86 _acl_brand_may_be(const acl_t acl, int brand) 87 { 88 89 if (_acl_brand(acl) == ACL_BRAND_UNKNOWN) 90 return (1); 91 92 if (_acl_brand(acl) == brand) 93 return (1); 94 95 return (0); 96 } 97 98 int 99 _entry_brand_may_be(const acl_entry_t entry, int brand) 100 { 101 102 return (_acl_brand_may_be(entry2acl(entry), brand)); 103 } 104 105 /* 106 * Brand ACL as "brand". 107 */ 108 void 109 _acl_brand_as(acl_t acl, int brand) 110 { 111 112 assert(_acl_brand_may_be(acl, brand)); 113 114 acl->ats_brand = brand; 115 } 116 117 void 118 _entry_brand_as(const acl_entry_t entry, int brand) 119 { 120 121 _acl_brand_as(entry2acl(entry), brand); 122 } 123 124 int 125 _acl_type_not_valid_for_acl(const acl_t acl, acl_type_t type) 126 { 127 128 switch (_acl_brand(acl)) { 129 case ACL_BRAND_NFS4: 130 if (type == ACL_TYPE_NFS4) 131 return (0); 132 break; 133 134 case ACL_BRAND_POSIX: 135 if (type == ACL_TYPE_ACCESS || type == ACL_TYPE_DEFAULT) 136 return (0); 137 break; 138 139 case ACL_BRAND_UNKNOWN: 140 return (0); 141 } 142 143 return (-1); 144 } 145 146 void 147 _acl_brand_from_type(acl_t acl, acl_type_t type) 148 { 149 150 switch (type) { 151 case ACL_TYPE_NFS4: 152 _acl_brand_as(acl, ACL_BRAND_NFS4); 153 break; 154 case ACL_TYPE_ACCESS: 155 case ACL_TYPE_DEFAULT: 156 _acl_brand_as(acl, ACL_BRAND_POSIX); 157 break; 158 default: 159 /* XXX: What to do here? */ 160 break; 161 } 162 } 163 164 int 165 acl_get_brand_np(acl_t acl, int *brand_p) 166 { 167 168 if (acl == NULL || brand_p == NULL) { 169 errno = EINVAL; 170 return (-1); 171 } 172 *brand_p = _acl_brand(acl); 173 174 return (0); 175 } 176