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361 lines
7.0 KiB
Groff
361 lines
7.0 KiB
Groff
.\" Copyright (c) 2002, 2004 Networks Associates Technology, Inc.
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.\" All rights reserved.
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.\"
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.\" This software was developed for the FreeBSD Project by Chris
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.\" Costello at Safeport Network Services and NAI Labs, the Security
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.\" Research Division of Network Associates, Inc. under DARPA/SPAWAR
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.\" contract N66001-01-C-8035 ("CBOSS"), as part of the DARPA CHATS
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.\" research program.
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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 AUTHORS 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 AUTHORS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" $FreeBSD$
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.\"
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.Dd February 24, 2004
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.Dt UGIDFW 8
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.Os
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.Sh NAME
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.Nm ugidfw
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.Nd "firewall-like access controls for file system objects"
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.Sh SYNOPSIS
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.Nm
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.Cm add
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.Cm subject
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.Op Cm not
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.Oo
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.Op Cm \&!
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.Cm uid Ar uid | minuid:maxuid
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.Oc
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.Oo
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.Op Cm \&!
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.Cm gid Ar gid | mingid:maxgid
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.Oc
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.Oo
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.Op Cm \&!
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.Cm jailid Ad jailid
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.Oc
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.Cm object
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.Op Cm not
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.Oo
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.Op Cm \&!
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.Cm uid Ar uid | minuid:maxuid
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.Oc
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.Oo
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.Op Cm \&!
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.Cm gid Ar gid | mingid:maxgid
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.Oc
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.Oo
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.Op Cm \&!
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.Cm filesys Ad path
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.Oc
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.Oo
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.Op Cm \&!
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.Cm suid
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.Oc
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.Oo
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.Op Cm \&!
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.Cm sgid
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.Oc
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.Oo
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.Op Cm \&!
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.Cm uid_of_subject
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.Oc
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.Oo
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.Op Cm \&!
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.Cm gid_of_subject
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.Oc
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.Oo
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.Op Cm \&!
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.Cm type Ar ardbclsp
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.Oc
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.Cm mode
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.Ar arswxn
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.Nm
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.Cm list
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.Nm
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.Cm set
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.Ar rulenum
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.Cm subject
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.Op Cm not
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.Oo
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.Op Cm \&!
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.Cm uid Ar uid | minuid:maxuid
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.Oc
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.Oo
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.Op Cm \&!
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.Cm gid Ar gid | mingid:maxgid
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.Oc
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.Oo
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.Op Cm \&!
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.Cm jailid Ad jailid
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.Oc
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.Cm object
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.Op Cm not
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.Oo
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.Op Cm \&!
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.Cm uid Ar uid | minuid:maxuid
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.Oc
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.Oo
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.Op Cm \&!
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.Cm gid Ar gid | mingid:maxgid
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.Oc
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.Oo
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.Op Cm \&!
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.Cm filesys Ad path
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.Oc
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.Oo
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.Op Cm \&!
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.Cm suid
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.Oc
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.Oo
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.Op Cm \&!
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.Cm sgid
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.Oc
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.Oo
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.Op Cm \&!
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.Cm uid_of_subject
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.Oc
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.Oo
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.Op Cm \&!
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.Cm gid_of_subject
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.Oc
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.Oo
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.Op Cm \&!
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.Cm type Ar ardbclsp
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.Oc
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.Cm mode
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.Ar arswxn
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.Nm
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.Cm remove
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.Ar rulenum
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.Sh DESCRIPTION
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The
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.Nm
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utility provides an
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.Xr ipfw 8 Ns -like
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interface to manage access to file system objects by UID and GID,
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supported by the
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.Xr mac_bsdextended 4
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.Xr mac 9
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policy.
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.Pp
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The arguments are as follows:
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.Bl -tag -width indent -offset indent
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.It Xo
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.Cm add
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.Cm subject
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.Ar ...
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.Cm object
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.Ar ...
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.Cm mode
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.Ar arswxn
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.Xc
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Add a new rule, automatically selecting the rule number.
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See the description of
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.Cm set
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for syntax information.
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.It Cm list
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Produces a list of all the current
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.Nm
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rules in the system.
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.It Xo
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.Cm set Ar rulenum
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.Cm subject
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.Ar ...
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.Cm object
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.Ar ...
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.Cm mode
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.Ar arswxn
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.Xc
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Add a new rule or modify an existing rule.
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The arguments are as follows:
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.Bl -tag -width ".Ar rulenum"
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.It Ar rulenum
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Rule number.
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Entries with a lower rule number
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are applied first;
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placing the most frequently-matched rules at the beginning of the list
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(i.e., lower-numbered)
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will yield a slight performance increase.
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.It Xo
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.Cm subject
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.Op Cm not
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.Oo
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.Op Cm \&!
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.Cm uid Ar uid | minuid:maxuid
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.Oc
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.Oo
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.Op Cm \&!
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.Cm gid Ar gid | mingid:maxgid
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.Oc
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.Oo
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.Op Cm \&!
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.Cm jailid Ad jailid
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.Oc
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.Xc
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Subjects performing an operation must match all the conditions given.
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A leading
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.Cm not
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means that the subject should not match the remainder of the specification.
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A condition may be prefixed by
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.Cm \&!
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to indicate that particular condition must not match the subject.
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The subject can be required to have a particular
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.Ar uid
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and/or
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.Ar gid .
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A range of uids/gids can be specified, separated by a colon.
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The subject can be required to be in a particular jail with the
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.Ar jailid .
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.It Xo
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.Cm object
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.Op Cm not
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.Oo
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.Op Cm \&!
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.Cm uid Ar uid | minuid:maxuid
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.Oc
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.Oo
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.Op Cm \&!
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.Cm gid Ar gid | mingid:maxgid
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.Oc
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.Oo
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.Op Cm \&!
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.Cm filesys Ad path
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.Oc
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.Oo
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.Op Cm \&!
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.Cm suid
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.Oc
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.Oo
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.Op Cm \&!
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.Cm sgid
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.Oc
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.Oo
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.Op Cm \&!
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.Cm uid_of_subject
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.Oc
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.Oo
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.Op Cm \&!
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.Cm gid_of_subject
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.Oc
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.Oo
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.Op Cm \&!
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.Cm type Ar ardbclsp
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.Oc
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.Xc
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The rule will apply only to objects matching all the specified conditions.
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A leading
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.Cm not
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means that the object should not match all the remaining conditions.
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A condition may be prefixed by
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.Cm \&!
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to indicate that particular condition must not match the object.
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Objects can be required to be owned by the user and/or group specified by
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.Ar uid
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and/or
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.Ar gid .
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A range of uids/gids can be specified, separated by a colon.
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The object can be required to be in a particular filesystem by
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specifying the filesystem using
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.Cm filesys .
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Note,
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if the filesystem is unmounted and remounted,
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then the rule may need to be reapplied to ensure the correct filesystem
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id is used.
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The object can be required to have the
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.Cm suid
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or
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.Cm sgid
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bits set.
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The owner of the object can be required to match the
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.Cm uid_of_subject
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or the
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.Cm gid_of_subject
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attempting the operation.
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The type of the object can be restricted to a subset of
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the following types.
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.Pp
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.Bl -tag -width ".Cm w" -compact -offset indent
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.It Cm a
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any file type
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.It Cm r
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a regular file
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.It Cm d
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a directory
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.It Cm b
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a block special device
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.It Cm c
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a character special device
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.It Cm l
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a symbolic link
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.It Cm s
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a unix domain socket
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.It Cm p
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a named pipe (FIFO)
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.El
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.It Cm mode Ar arswxn
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Similar to
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.Xr chmod 1 ,
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each character represents an access mode.
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If the rule applies,
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the specified access permissions are enforced
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for the object.
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When a character is specified in the rule,
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the rule will allow for the operation.
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Conversely, not including it will cause the operation
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to be denied.
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The definitions of each character are as follows:
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.Pp
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.Bl -tag -width ".Cm w" -compact -offset indent
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.It Cm a
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administrative operations
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.It Cm r
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read access
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.It Cm s
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access to file attributes
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.It Cm w
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write access
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.It Cm x
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execute access
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.It Cm n
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none
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.El
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.El
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.It Cm remove Ar rulenum
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Disable and remove the rule with the specified rule number.
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.El
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.Sh SEE ALSO
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.Xr mac_bsdextended 4 ,
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.Xr mac 9
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.Sh HISTORY
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The
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.Nm
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utility first appeared in
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.Fx 5.0 .
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.Sh AUTHORS
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This software was contributed to the
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.Fx
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Project by NAI Labs, the Security Research Division of Network Associates
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Inc.\& under DARPA/SPAWAR contract N66001-01-C-8035
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.Pq Dq CBOSS ,
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as part of the DARPA CHATS research program.
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