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