100 lines
2.9 KiB
Groff
100 lines
2.9 KiB
Groff
.\" $NetBSD: chroot.8,v 1.12 2003/08/07 11:25:14 agc Exp $
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.\"
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.\" Copyright (c) 1988, 1991, 1993
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.\" The Regents of the University of California. 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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.\" 3. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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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.\" from: @(#)chroot.8 8.1 (Berkeley) 6/9/93
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.\"
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.Dd October 6, 1998
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.Dt CHROOT 8
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.Os
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.Sh NAME
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.Nm chroot
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.Nd change root directory
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.Sh SYNOPSIS
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.Nm
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.Op Fl u Ar user
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.Op Fl g Ar group
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.Op Fl G Ar group,group,...
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.Ar newroot
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.Op Ar command
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.Sh DESCRIPTION
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The
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.Nm
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command changes its root directory to the supplied directory
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.Ar newroot
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and exec's
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.Ar command ,
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if supplied, or an interactive copy of your shell.
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.Pp
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If the
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.Fl u ,
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.Fl g
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or
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.Fl G
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options are given, the user, group and group list of the process are
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set to these values after the chroot has taken place. See
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.Xr setgid 2 ,
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.Xr setgroups 2 ,
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.Xr setuid 2 ,
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.Xr getgrnam 3
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and
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.Xr getpwnam 3 .
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.Pp
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Note,
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.Ar command
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or the shell are run as your real-user-id.
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.Sh ENVIRONMENT
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The following environment variable is referenced by
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.Nm :
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.Bl -tag -width SHELL
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.It Ev SHELL
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If set,
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the string specified by
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.Ev SHELL
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is interpreted as the name of
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the shell to exec.
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If the variable
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.Ev SHELL
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is not set,
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.Pa /bin/sh
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is used.
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.El
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.Sh SEE ALSO
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.Xr chdir 2 ,
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.Xr chroot 2 ,
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.Xr environ 7
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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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.Bx 4.4 .
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.Sh SECURITY CONSIDERATIONS
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.Nm
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should never be installed setuid root, as it would then be possible
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to exploit the program to gain root privileges.
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