1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 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 <assert.h> 29 #include <errno.h> 30 #include <sys/acl.h> 31 32 #include "acl_support.h" 33 34 /* 35 * An ugly detail of the implementation - fortunately not visible 36 * to the API users - is the "branding": libc needs to keep track 37 * of what "brand" ACL is: NFSv4, POSIX.1e or unknown. It happens 38 * automatically - for example, during acl_get_file(3) ACL gets 39 * branded according to the "type" argument; during acl_set_permset 40 * ACL, if its brand is unknown it gets branded as NFSv4 if any of the 41 * NFSv4 permissions that are not valid for POSIX.1e ACL are set etc. 42 * Branding information is used for printing out the ACL (acl_to_text(3)), 43 * veryfying acl_set_whatever arguments (checking against setting 44 * bits that are valid only for NFSv4 in ACL branded as POSIX.1e) etc. 45 */ 46 47 static acl_t 48 entry2acl(acl_entry_t entry) 49 { 50 acl_t aclp; 51 52 aclp = (acl_t)(((long)entry >> _ACL_T_ALIGNMENT_BITS) << _ACL_T_ALIGNMENT_BITS); 53 54 return (aclp); 55 } 56 57 /* 58 * Return brand of an ACL. 59 */ 60 int 61 _acl_brand(const acl_t acl) 62 { 63 64 return (acl->ats_brand); 65 } 66 67 int 68 _entry_brand(const acl_entry_t entry) 69 { 70 71 return (_acl_brand(entry2acl(entry))); 72 } 73 74 /* 75 * Return 1, iff branding ACL as "brand" is ok. 76 */ 77 int 78 _acl_brand_may_be(const acl_t acl, int brand) 79 { 80 81 if (_acl_brand(acl) == ACL_BRAND_UNKNOWN) 82 return (1); 83 84 if (_acl_brand(acl) == brand) 85 return (1); 86 87 return (0); 88 } 89 90 int 91 _entry_brand_may_be(const acl_entry_t entry, int brand) 92 { 93 94 return (_acl_brand_may_be(entry2acl(entry), brand)); 95 } 96 97 /* 98 * Brand ACL as "brand". 99 */ 100 void 101 _acl_brand_as(acl_t acl, int brand) 102 { 103 104 assert(_acl_brand_may_be(acl, brand)); 105 106 acl->ats_brand = brand; 107 } 108 109 void 110 _entry_brand_as(const acl_entry_t entry, int brand) 111 { 112 113 _acl_brand_as(entry2acl(entry), brand); 114 } 115 116 int 117 _acl_type_not_valid_for_acl(const acl_t acl, acl_type_t type) 118 { 119 120 switch (_acl_brand(acl)) { 121 case ACL_BRAND_NFS4: 122 if (type == ACL_TYPE_NFS4) 123 return (0); 124 break; 125 126 case ACL_BRAND_POSIX: 127 if (type == ACL_TYPE_ACCESS || type == ACL_TYPE_DEFAULT) 128 return (0); 129 break; 130 131 case ACL_BRAND_UNKNOWN: 132 return (0); 133 } 134 135 return (-1); 136 } 137 138 void 139 _acl_brand_from_type(acl_t acl, acl_type_t type) 140 { 141 142 switch (type) { 143 case ACL_TYPE_NFS4: 144 _acl_brand_as(acl, ACL_BRAND_NFS4); 145 break; 146 case ACL_TYPE_ACCESS: 147 case ACL_TYPE_DEFAULT: 148 _acl_brand_as(acl, ACL_BRAND_POSIX); 149 break; 150 default: 151 /* XXX: What to do here? */ 152 break; 153 } 154 } 155 156 int 157 acl_get_brand_np(acl_t acl, int *brand_p) 158 { 159 160 if (acl == NULL || brand_p == NULL) { 161 errno = EINVAL; 162 return (-1); 163 } 164 *brand_p = _acl_brand(acl); 165 166 return (0); 167 } 168