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