1 /*- 2 * Copyright (c) 1999, 2000, 2001, 2002 Robert N. M. Watson 3 * All rights reserved. 4 * 5 * This software was developed by Robert Watson for the TrustedBSD Project. 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 * acl_get_fd - syscall wrapper for retrieving access ACL by fd 30 * acl_get_fd_np - syscall wrapper for retrieving ACL by fd (non-POSIX) 31 * acl_get_file - syscall wrapper for retrieving ACL by filename 32 * acl_get_link_np - syscall wrapper for retrieving ACL by filename (NOFOLLOW) 33 * (non-POSIX) 34 * acl_get_perm_np() checks if a permission is in the specified 35 * permset (non-POSIX) 36 * acl_get_permset() returns the permission set in the ACL entry 37 * acl_get_qualifier() retrieves the qualifier of the tag from the ACL entry 38 * acl_get_tag_type() returns the tag type for the ACL entry entry_d 39 */ 40 41 #include <sys/cdefs.h> 42 __FBSDID("$FreeBSD$"); 43 44 #include <sys/types.h> 45 #include "namespace.h" 46 #include <sys/acl.h> 47 #include "un-namespace.h" 48 49 #include <errno.h> 50 #include <stdlib.h> 51 #include <string.h> 52 #include <unistd.h> 53 54 #include "acl_support.h" 55 56 acl_t 57 acl_get_file(const char *path_p, acl_type_t type) 58 { 59 acl_t aclp; 60 int error; 61 62 aclp = acl_init(ACL_MAX_ENTRIES); 63 if (aclp == NULL) 64 return (NULL); 65 66 type = _acl_type_unold(type); 67 error = __acl_get_file(path_p, type, &aclp->ats_acl); 68 if (error) { 69 acl_free(aclp); 70 return (NULL); 71 } 72 73 aclp->ats_acl.acl_maxcnt = ACL_MAX_ENTRIES; 74 _acl_brand_from_type(aclp, type); 75 76 return (aclp); 77 } 78 79 acl_t 80 acl_get_link_np(const char *path_p, acl_type_t type) 81 { 82 acl_t aclp; 83 int error; 84 85 aclp = acl_init(ACL_MAX_ENTRIES); 86 if (aclp == NULL) 87 return (NULL); 88 89 type = _acl_type_unold(type); 90 error = __acl_get_link(path_p, type, &aclp->ats_acl); 91 if (error) { 92 acl_free(aclp); 93 return (NULL); 94 } 95 96 aclp->ats_acl.acl_maxcnt = ACL_MAX_ENTRIES; 97 _acl_brand_from_type(aclp, type); 98 99 return (aclp); 100 } 101 102 acl_t 103 acl_get_fd(int fd) 104 { 105 if (fpathconf(fd, _PC_ACL_NFS4)) 106 return (acl_get_fd_np(fd, ACL_TYPE_NFS4)); 107 108 return (acl_get_fd_np(fd, ACL_TYPE_ACCESS)); 109 } 110 111 acl_t 112 acl_get_fd_np(int fd, acl_type_t type) 113 { 114 acl_t aclp; 115 int error; 116 117 aclp = acl_init(ACL_MAX_ENTRIES); 118 if (aclp == NULL) 119 return (NULL); 120 121 type = _acl_type_unold(type); 122 error = ___acl_get_fd(fd, type, &aclp->ats_acl); 123 if (error) { 124 acl_free(aclp); 125 return (NULL); 126 } 127 128 aclp->ats_acl.acl_maxcnt = ACL_MAX_ENTRIES; 129 _acl_brand_from_type(aclp, type); 130 131 return (aclp); 132 } 133 134 int 135 acl_get_perm_np(acl_permset_t permset_d, acl_perm_t perm) 136 { 137 138 if (permset_d == NULL) { 139 errno = EINVAL; 140 return (-1); 141 } 142 143 switch(perm) { 144 case ACL_READ: 145 case ACL_WRITE: 146 case ACL_EXECUTE: 147 if (*permset_d & perm) 148 return (1); 149 break; 150 default: 151 errno = EINVAL; 152 return (-1); 153 } 154 155 return (0); 156 } 157 158 /* 159 * acl_get_permset() (23.4.17): return via permset_p a descriptor to 160 * the permission set in the ACL entry entry_d. 161 */ 162 int 163 acl_get_permset(acl_entry_t entry_d, acl_permset_t *permset_p) 164 { 165 166 if (entry_d == NULL || permset_p == NULL) { 167 errno = EINVAL; 168 return (-1); 169 } 170 171 *permset_p = &entry_d->ae_perm; 172 173 return (0); 174 } 175 176 /* 177 * acl_get_qualifier() (23.4.18): retrieve the qualifier of the tag 178 * for the ACL entry entry_d. 179 */ 180 void * 181 acl_get_qualifier(acl_entry_t entry_d) 182 { 183 uid_t *retval; 184 185 if (entry_d == NULL) { 186 errno = EINVAL; 187 return (NULL); 188 } 189 190 switch(entry_d->ae_tag) { 191 case ACL_USER: 192 case ACL_GROUP: 193 retval = malloc(sizeof(uid_t)); 194 if (retval == NULL) 195 return (NULL); 196 *retval = entry_d->ae_id; 197 return (retval); 198 } 199 200 errno = EINVAL; 201 return (NULL); 202 } 203 204 /* 205 * acl_get_tag_type() (23.4.19): return the tag type for the ACL 206 * entry entry_p. 207 */ 208 int 209 acl_get_tag_type(acl_entry_t entry_d, acl_tag_t *tag_type_p) 210 { 211 212 if (entry_d == NULL || tag_type_p == NULL) { 213 errno = EINVAL; 214 return (-1); 215 } 216 217 *tag_type_p = entry_d->ae_tag; 218 219 return (0); 220 } 221 222 int 223 acl_get_entry_type_np(acl_entry_t entry_d, acl_entry_type_t *entry_type_p) 224 { 225 226 if (entry_d == NULL || entry_type_p == NULL) { 227 errno = EINVAL; 228 return (-1); 229 } 230 231 if (!_entry_brand_may_be(entry_d, ACL_BRAND_NFS4)) { 232 errno = EINVAL; 233 return (-1); 234 } 235 236 *entry_type_p = entry_d->ae_entry_type; 237 238 return (0); 239 } 240