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.\"-
.\" Copyright (c) 1999-2001 Robert N. M. Watson
.\" All rights reserved.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
.\" 1. Redistributions of source code must retain the above copyright
.\" notice, this list of conditions and the following disclaimer.
.\" 2. Redistributions in binary form must reproduce the above copyright
.\" notice, this list of conditions and the following disclaimer in the
.\" documentation and/or other materials provided with the distribution.
.\"
.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
.\" SUCH DAMAGE.
.\"
.\" $FreeBSD$
.\"
.Dd December 23, 1999
.Os
.Dt ACL 9
.Sh NAME
.Nm acl
.Nd virtual file system access control lists
.Sh SYNOPSIS
.In sys/param.h
.In sys/vnode.h
.In sys/acl.h
.Pp
.Bd -literal
typedef int acl_type_t;
typedef int acl_tag_t;
typedef mode_t acl_perm_t;
typedef mode_t *acl_permset_t;
struct acl_entry {
acl_tag_t ae_tag;
uid_t ae_id;
acl_perm_t ae_perm;
};
typedef struct acl_entry *acl_entry_t;
/* internal ACL structure */
struct acl {
int acl_cnt;
struct acl_entry acl_entry[ACL_MAX_ENTRIES];
};
/* external ACL structure */
struct acl_t_struct {
struct acl ats_acl;
int ats_cur_entry;
};
typedef struct acl_t_struct *acl_t;
/*
* Possible valid values for ae_tag field.
*/
#define ACL_UNDEFINED_TAG 0x00000000
#define ACL_USER_OBJ 0x00000001
#define ACL_USER 0x00000002
#define ACL_GROUP_OBJ 0x00000004
#define ACL_GROUP 0x00000008
#define ACL_MASK 0x00000010
#define ACL_OTHER 0x00000020
#define ACL_OTHER_OBJ ACL_OTHER
/*
* Possible valid values for acl_type_t arguments.
*/
#define ACL_TYPE_ACCESS 0x00000000
#define ACL_TYPE_DEFAULT 0x00000001
#define ACL_TYPE_AFS 0x00000002
#define ACL_TYPE_CODA 0x00000003
#define ACL_TYPE_NTFS 0x00000004
#define ACL_TYPE_NWFS 0x00000005
/*
* Possible flags in ae_perm field.
*/
#define ACL_EXECUTE 0x0001
#define ACL_WRITE 0x0002
#define ACL_READ 0x0004
#define ACL_PERM_NONE 0x0000
#define ACL_PERM_BITS (ACL_EXECUTE | ACL_WRITE | ACL_READ)
#define ACL_POSIX1E_BITS (ACL_EXECUTE | ACL_WRITE | ACL_READ)
/*
* Possible entry_id values for acl_get_entry()
*/
#define ACL_FIRST_ENTRY 0
#define ACL_NEXT_ENTRY 1
/*
* Undefined value in ae_id field
*/
#define ACL_UNDEFINED_ID ((uid_t)-1)
.Ed
.Sh DESCRIPTION
Access control lists, or ACLs, allow fine-grained specification of rights
for vnodes representing files and directories. However, as there are a
plethora of file systems with differing ACL semantics, the vnode interface
is aware only of the syntax of ACLs, relying on the underlying file system
to implement the details. Depending on the underlying file system, each
file or directory may have zero or more ACLs associated with it, named using
the
.Fa type
field of the appropriate vnode ACL calls,
.Xr VOP_ACLCHECK 9 ,
.Xr VOP_GETACL 9 ,
and
.Xr VOP_SETACL 9 .
.Pp
Currently, each ACL is represented in-kernel by a fixed-size acl structure.
An ACL is constructed from a fixed size array of ACL entries, each of which
consists of a set of permissions, principal namespace, and principal
identifier. Zero or more of these entries may be "defined", depending on
the value of the associated acl_cnt field.
.Sh SEE ALSO
.Xr acl 3 ,
.Xr vaccess 9 ,
.Xr vaccess_acl_posix1e 9 ,
.Xr VFS 9 ,
.Xr VOP_ACLCHECK 9 ,
.Xr VOP_GETACL 9 ,
.Xr VOP_SETACL 9
.Sh AUTHORS
This man page was written by
.An Robert Watson .
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