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 <sys/cdefs.h> 29 #include <assert.h> 30 #include <errno.h> 31 #include <sys/acl.h> 32 33 #include "acl_support.h" 34 35 /* 36 * An ugly detail of the implementation - fortunately not visible 37 * to the API users - is the "branding": libc needs to keep track 38 * of what "brand" ACL is: NFSv4, POSIX.1e or unknown. It happens 39 * automatically - for example, during acl_get_file(3) ACL gets 40 * branded according to the "type" argument; during acl_set_permset 41 * ACL, if its brand is unknown it gets branded as NFSv4 if any of the 42 * NFSv4 permissions that are not valid for POSIX.1e ACL are set etc. 43 * Branding information is used for printing out the ACL (acl_to_text(3)), 44 * veryfying acl_set_whatever arguments (checking against setting 45 * bits that are valid only for NFSv4 in ACL branded as POSIX.1e) etc. 46 */ 47 48 static acl_t 49 entry2acl(acl_entry_t entry) 50 { 51 acl_t aclp; 52 53 aclp = (acl_t)(((long)entry >> _ACL_T_ALIGNMENT_BITS) << _ACL_T_ALIGNMENT_BITS); 54 55 return (aclp); 56 } 57 58 /* 59 * Return brand of an ACL. 60 */ 61 int 62 _acl_brand(const acl_t acl) 63 { 64 65 return (acl->ats_brand); 66 } 67 68 int 69 _entry_brand(const acl_entry_t entry) 70 { 71 72 return (_acl_brand(entry2acl(entry))); 73 } 74 75 /* 76 * Return 1, iff branding ACL as "brand" is ok. 77 */ 78 int 79 _acl_brand_may_be(const acl_t acl, int brand) 80 { 81 82 if (_acl_brand(acl) == ACL_BRAND_UNKNOWN) 83 return (1); 84 85 if (_acl_brand(acl) == brand) 86 return (1); 87 88 return (0); 89 } 90 91 int 92 _entry_brand_may_be(const acl_entry_t entry, int brand) 93 { 94 95 return (_acl_brand_may_be(entry2acl(entry), brand)); 96 } 97 98 /* 99 * Brand ACL as "brand". 100 */ 101 void 102 _acl_brand_as(acl_t acl, int brand) 103 { 104 105 assert(_acl_brand_may_be(acl, brand)); 106 107 acl->ats_brand = brand; 108 } 109 110 void 111 _entry_brand_as(const acl_entry_t entry, int brand) 112 { 113 114 _acl_brand_as(entry2acl(entry), brand); 115 } 116 117 int 118 _acl_type_not_valid_for_acl(const acl_t acl, acl_type_t type) 119 { 120 121 switch (_acl_brand(acl)) { 122 case ACL_BRAND_NFS4: 123 if (type == ACL_TYPE_NFS4) 124 return (0); 125 break; 126 127 case ACL_BRAND_POSIX: 128 if (type == ACL_TYPE_ACCESS || type == ACL_TYPE_DEFAULT) 129 return (0); 130 break; 131 132 case ACL_BRAND_UNKNOWN: 133 return (0); 134 } 135 136 return (-1); 137 } 138 139 void 140 _acl_brand_from_type(acl_t acl, acl_type_t type) 141 { 142 143 switch (type) { 144 case ACL_TYPE_NFS4: 145 _acl_brand_as(acl, ACL_BRAND_NFS4); 146 break; 147 case ACL_TYPE_ACCESS: 148 case ACL_TYPE_DEFAULT: 149 _acl_brand_as(acl, ACL_BRAND_POSIX); 150 break; 151 default: 152 /* XXX: What to do here? */ 153 break; 154 } 155 } 156 157 int 158 acl_get_brand_np(acl_t acl, int *brand_p) 159 { 160 161 if (acl == NULL || brand_p == NULL) { 162 errno = EINVAL; 163 return (-1); 164 } 165 *brand_p = _acl_brand(acl); 166 167 return (0); 168 } 169