1.\"- 2.\" Copyright (c) 1999, 2000 Robert N. M. Watson 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.\" $FreeBSD: src/share/man/man9/acl.9,v 1.2.2.4 2001/12/17 11:30:18 ru Exp $ 27.\" $DragonFly: src/share/man/man9/acl.9,v 1.2 2003/06/17 04:37:01 dillon Exp $ 28.\" 29.Dd December 23, 1999 30.Os 31.Dt ACL 9 32.Sh NAME 33.Nm acl 34.Nd virtual file system access control lists 35.Sh SYNOPSIS 36.In sys/param.h 37.In sys/vnode.h 38.In sys/acl.h 39.Pp 40.Bd -literal 41typedef int acl_type_t; 42typedef int acl_tag_t; 43typedef mode_t acl_perm_t; 44 45struct acl_entry { 46 acl_tag_t ae_tag; 47 uid_t ae_id; 48 acl_perm_t ae_perm; 49}; 50typedef struct acl_entry *acl_entry_t; 51 52struct acl { 53 int acl_cnt; 54 struct acl_entry acl_entry[ACL_MAX_ENTRIES]; 55}; 56typedef struct acl *acl_t; 57 58/* 59 * Possible valid values for a_tag of acl_entry_t 60 */ 61#define ACL_USER_OBJ 0x00000001 62#define ACL_USER 0x00000002 63#define ACL_GROUP_OBJ 0x00000004 64#define ACL_GROUP 0x00000008 65#define ACL_MASK 0x00000010 66#define ACL_OTHER 0x00000020 67#define ACL_OTHER_OBJ ACL_OTHER 68 69/* 70 * Possible valid values a_type_t arguments 71 */ 72#define ACL_TYPE_ACCESS 0x00000000 73#define ACL_TYPE_DEFAULT 0x00000001 74#define ACL_TYPE_AFS 0x00000002 75#define ACL_TYPE_CODA 0x00000003 76#define ACL_TYPE_NTFS 0x00000004 77#define ACL_TYPE_NWFS 0x00000005 78 79/* 80 * Possible flags in a_perm field 81 */ 82#define ACL_PERM_EXEC 0x0001 83#define ACL_PERM_WRITE 0x0002 84#define ACL_PERM_READ 0x0004 85#define ACL_PERM_NONE 0x0000 86#define ACL_PERM_BITS (ACL_PERM_EXEC | ACL_PERM_WRITE | ACL_PERM_READ) 87#define ACL_POSIX1E_BITS (ACL_PERM_EXEC | ACL_PERM_WRITE | ACL_PERM_READ) 88.Ed 89.Sh DESCRIPTION 90Access control lists, or ACLs, allow fine-grained specification of rights 91for vnodes representing files and directories. However, as there are a 92plethora of file systems with differing ACL semantics, the vnode interface 93is aware only of the syntax of ACLs, relying on the underlying file system 94to implement the details. Depending on the underlying file system, each 95file or directory may have zero or more ACLs associated with it, named using 96the 97.Fa type 98field of the appropriate vnode ACL calls, 99.Xr VOP_ACLCHECK 9 , 100.Xr VOP_GETACL 9 , 101and 102.Xr VOP_SETACL 9 . 103.Pp 104Currently, each ACL is represented in-kernel by a fixed-size acl structure. 105An ACL is constructed from a fixed size array of ACL entries, each of which 106consists of a set of permissions, principal namespace, and principal 107identifier. Zero or more of these entries may be "defined", depending on 108the value of the associated acl_cnt field. 109.Sh SEE ALSO 110.Xr VFS 9 , 111.Xr VOP_ACLCHECK 9 , 112.Xr VOP_GETACL 9 , 113.Xr VOP_SETACL 9 114.Sh AUTHORS 115This man page was written by 116.An Robert Watson . 117