aa16198749
tools such as chmod(1) and ls(1) when it comes to acting on objects that have POSIX.1e extended ACLs. Specifically, discuss the substitution of the mask entry for the group entry in the mode representation of the ACL. Differently worded from the submission, and could probably use further refinement. PR: 55319 Submitted by: Grzegorz Czaplinski <G.Czaplinski@prioris.mini.pw.edu.pl>
286 lines
7.4 KiB
Groff
286 lines
7.4 KiB
Groff
.\"
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.\" Copyright (c) 2001 Chris D. Faulhaber
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.\" All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR THE VOICES IN HIS HEAD BE
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.\" LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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.\" POSSIBILITY OF SUCH DAMAGE.
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.\"
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.\" $FreeBSD$
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.\"
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.Dd January 7, 2001
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.Dt SETFACL 1
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.Os
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.Sh NAME
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.Nm setfacl
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.Nd set ACL information
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.Sh SYNOPSIS
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.Nm
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.Op Fl bdhkn
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.Op Fl m Ar entries
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.Op Fl M Ar file1
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.Op Fl x Ar entries
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.Op Fl X Ar file1
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.Op Ar
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.Sh DESCRIPTION
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The
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.Nm
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utility sets discretionary access control information on
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the specified file(s).
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.Pp
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The following options are available:
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.Bl -tag -width indent
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.It Fl b
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Remove all ACL entries except for the three required entries.
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If the ACL contains a
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.Dq Li mask
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entry, the permissions of the
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.Dq Li group
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entry in the resulting ACL will be set to the permission
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associated with both the
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.Dq Li group
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and
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.Dq Li mask
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entries of the current ACL.
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.It Fl d
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The operations apply to the default ACL entries instead of
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access ACL entries. Currently only directories may have
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default ACL's.
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.It Fl h
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If the target of the operation is a symbolic link, perform the operation
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on the symbolic link itself, rather than following the link.
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.It Fl k
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Delete any default ACL entries on the specified files. It
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is not considered an error if the specified files do not have
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any default ACL entries. An error will be reported if any of
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the specified files cannot have a default entry (i.e.\&
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non-directories).
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.It Fl m Ar entries
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Modify the ACL entries on the specified files by adding new
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entries and modifying existing ACL entries with the ACL entries
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specified in
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.Ar entries .
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.It Fl M Ar file
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Modify the ACL entries on the specified files by adding new
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ACL entries and modifying existing ACL entries with the ACL
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entries specified in the file
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.Ar file .
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If
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.Ar file
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is
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.Fl ,
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the input is taken from stdin.
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.It Fl n
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Do not recalculate the permissions associated with the ACL
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mask entry.
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.It Fl x Ar entries
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Remove the ACL entries specified in
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.Ar entries
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from the access or default ACL of the specified files.
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.It Fl X Ar file
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Remove the ACL entries specified in the file
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.Ar file
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from the access or default ACL of the specified files.
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.El
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.Pp
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The above options are evaluated in the order specified
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on the command-line.
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.Sh ACL ENTRIES
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An ACL entry contains three colon-separated fields:
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an ACL tag, an ACL qualifier, and discretionary access
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permissions:
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.Bl -tag -width indent
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.It Ar "ACL tag"
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The ACL tag specifies the ACL entry type and consists of
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one of the following:
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.Dq Li user
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or
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.Ql u
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specifying the access
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granted to the owner of the file or a specified user;
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.Dq Li group
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or
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.Ql g
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specifying the access granted to the file owning group
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or a specified group;
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.Dq Li other
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or
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.Ql o
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specifying the access
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granted to any process that does not match any user or group
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ACL entry;
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.Dq Li mask
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or
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.Ql m
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specifying the maximum access
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granted to any ACL entry except the
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.Dq Li user
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ACL entry for the file owner and the
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.Dq Li other
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ACL entry.
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.It Ar "ACL qualifier"
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The ACL qualifier field describes the user or group associated with
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the ACL entry. It may consist of one of the following: uid or
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user name, gid or group name, or empty. For
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.Dq Li user
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ACL entries, an empty field specifies access granted to the
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file owner. For
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.Dq Li group
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ACL entries, an empty field specifies access granted to the
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file owning group.
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.Dq Li mask
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and
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.Dq Li other
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ACL entries do not use this field.
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.It Ar "access permissions"
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The access permissions field contains up to one of each of
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the following:
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.Ql r ,
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.Ql w ,
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and
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.Ql x
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to set read, write, and
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execute permissions, respectively. Each of these may be excluded
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or replaced with a
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.Ql -
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character to indicate no access.
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.El
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.Pp
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A
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.Dq Li mask
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ACL entry is required on a file with any ACL entries other than
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the default
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.Dq Li user ,
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.Dq Li group ,
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and
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.Dq Li other
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ACL entries. If the
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.Fl n
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option is not specified and no
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.Dq Li mask
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ACL entry was specified, the
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.Nm
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utility
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will apply a
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.Dq Li mask
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ACL entry consisting of the union of the permissions associated
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with all
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.Dq Li group
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ACL entries in the resulting ACL.
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.Pp
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Traditional POSIX interfaces acting on file system object modes have
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modified semantics in the presence of POSIX.1e extended ACLs.
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When a mask entry is present on the access ACL of an object, the mask
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entry is substituted for the group bits; this occurs in programs such
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as
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.Xr stat 1
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or
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.Xr ls 1 .
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When the mode is modified on an object that has a mask entry, the
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changes applied to the group bits will actually be applied to the
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mask entry.
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These semantics provide for greater application compatibility:
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applications modifying the mode instead of the ACL will see
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conservative behavior, limiting the effective rights granted by all
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of the additional user and group entries; this occurs in programs
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such as
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.Xr chmod 1 .
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.Pp
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ACL entries applied from a file using the
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.Fl M
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or
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.Fl X
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options shall be of the following form: one ACL entry per line, as
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previously specified; whitespace is ignored; any text after a
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.Ql #
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is ignored (comments).
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.Pp
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When ACL entries are evaluated, the access check algorithm checks
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the ACL entries in the following order: file owner,
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.Dq Li user
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ACL entries, file owning group,
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.Dq Li group
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ACL entries, and
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.Dq Li other
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ACL entry.
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.Pp
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Multiple ACL entries specified on the command line are
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separated by commas.
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.Sh DIAGNOSTICS
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.Ex -std
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.Sh EXAMPLES
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.Dl setfacl -m u::rwx,g:mail:rw file
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.Pp
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Sets read, write, and execute permissions for the
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.Pa file
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owner's ACL entry and read and write permissions for group mail on
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.Pa file .
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.Pp
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.Dl setfacl -M file1 file2
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.Pp
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Sets/updates the ACL entries contained in
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.Pa file1
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on
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.Pa file2 .
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.Pp
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.Dl setfacl -x g:mail:rw file
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.Pp
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Remove the group mail ACL entry containing read/write permissions
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from
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.Pa file.
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.Pp
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.Dl setfacl -bn file
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.Pp
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Remove all
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.Dq Li access
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ACL entries except for the three required from
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.Pa file .
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.Pp
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.Dl getfacl file1 | setfacl -b -n -M - file2
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.Pp
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Copy ACL entries from
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.Pa file1
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to
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.Pa file2 .
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.Sh SEE ALSO
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.Xr getfacl 1 ,
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.Xr acl 3 ,
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.Xr getextattr 8 ,
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.Xr setextattr 8 ,
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.Xr acl 9 ,
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.Xr extattr 9
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.Sh STANDARDS
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The
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.Nm
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utility is expected to be
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.Tn IEEE
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Std 1003.2c compliant.
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.Sh HISTORY
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Extended Attribute and Access Control List support was developed
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as part of the
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.Tn TrustedBSD
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Project and introduced in
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.Fx 5.0 .
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.Sh AUTHORS
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The
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.Nm
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utility was written by
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.An Chris D. Faulhaber Aq jedgar@fxp.org .
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