1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 2008, 2009 Edward Tomasz Napierała <trasz@FreeBSD.org> 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25 * SUCH DAMAGE. 26 */ 27 28 #include <sys/cdefs.h> 29 __FBSDID("$FreeBSD$"); 30 31 #include <assert.h> 32 #include <errno.h> 33 #include <sys/acl.h> 34 35 #include "acl_support.h" 36 37 /* 38 * An ugly detail of the implementation - fortunately not visible 39 * to the API users - is the "branding": libc needs to keep track 40 * of what "brand" ACL is: NFSv4, POSIX.1e or unknown. It happens 41 * automatically - for example, during acl_get_file(3) ACL gets 42 * branded according to the "type" argument; during acl_set_permset 43 * ACL, if its brand is unknown it gets branded as NFSv4 if any of the 44 * NFSv4 permissions that are not valid for POSIX.1e ACL are set etc. 45 * Branding information is used for printing out the ACL (acl_to_text(3)), 46 * veryfying acl_set_whatever arguments (checking against setting 47 * bits that are valid only for NFSv4 in ACL branded as POSIX.1e) etc. 48 */ 49 50 static acl_t 51 entry2acl(acl_entry_t entry) 52 { 53 acl_t aclp; 54 55 aclp = (acl_t)(((long)entry >> _ACL_T_ALIGNMENT_BITS) << _ACL_T_ALIGNMENT_BITS); 56 57 return (aclp); 58 } 59 60 /* 61 * Return brand of an ACL. 62 */ 63 int 64 _acl_brand(const acl_t acl) 65 { 66 67 return (acl->ats_brand); 68 } 69 70 int 71 _entry_brand(const acl_entry_t entry) 72 { 73 74 return (_acl_brand(entry2acl(entry))); 75 } 76 77 /* 78 * Return 1, iff branding ACL as "brand" is ok. 79 */ 80 int 81 _acl_brand_may_be(const acl_t acl, int brand) 82 { 83 84 if (_acl_brand(acl) == ACL_BRAND_UNKNOWN) 85 return (1); 86 87 if (_acl_brand(acl) == brand) 88 return (1); 89 90 return (0); 91 } 92 93 int 94 _entry_brand_may_be(const acl_entry_t entry, int brand) 95 { 96 97 return (_acl_brand_may_be(entry2acl(entry), brand)); 98 } 99 100 /* 101 * Brand ACL as "brand". 102 */ 103 void 104 _acl_brand_as(acl_t acl, int brand) 105 { 106 107 assert(_acl_brand_may_be(acl, brand)); 108 109 acl->ats_brand = brand; 110 } 111 112 void 113 _entry_brand_as(const acl_entry_t entry, int brand) 114 { 115 116 _acl_brand_as(entry2acl(entry), brand); 117 } 118 119 int 120 _acl_type_not_valid_for_acl(const acl_t acl, acl_type_t type) 121 { 122 123 switch (_acl_brand(acl)) { 124 case ACL_BRAND_NFS4: 125 if (type == ACL_TYPE_NFS4) 126 return (0); 127 break; 128 129 case ACL_BRAND_POSIX: 130 if (type == ACL_TYPE_ACCESS || type == ACL_TYPE_DEFAULT) 131 return (0); 132 break; 133 134 case ACL_BRAND_UNKNOWN: 135 return (0); 136 } 137 138 return (-1); 139 } 140 141 void 142 _acl_brand_from_type(acl_t acl, acl_type_t type) 143 { 144 145 switch (type) { 146 case ACL_TYPE_NFS4: 147 _acl_brand_as(acl, ACL_BRAND_NFS4); 148 break; 149 case ACL_TYPE_ACCESS: 150 case ACL_TYPE_DEFAULT: 151 _acl_brand_as(acl, ACL_BRAND_POSIX); 152 break; 153 default: 154 /* XXX: What to do here? */ 155 break; 156 } 157 } 158 159 int 160 acl_get_brand_np(acl_t acl, int *brand_p) 161 { 162 163 if (acl == NULL || brand_p == NULL) { 164 errno = EINVAL; 165 return (-1); 166 } 167 *brand_p = _acl_brand(acl); 168 169 return (0); 170 } 171