f0181db72e
- Sort arguments in synopsis. - Clarify that it is possible to specify arguments to the command (and that they could be passed as further arguments to chroot(1)). - Standardize the description of the flags. - Improve formatting (e.g., do not use macros in strings specifying width). - Add examples. Reviewed by: bcr Approved by: bcr (doc) Approved by: krion (mentor, implicit), mat (mentor, implicit) Differential Revision: https://reviews.freebsd.org/D19582
117 lines
3.3 KiB
Groff
117 lines
3.3 KiB
Groff
.\" Copyright (c) 1988, 1991, 1993
|
|
.\" The Regents of the University of California. 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.
|
|
.\" 3. Neither the name of the University nor the names of its contributors
|
|
.\" may be used to endorse or promote products derived from this software
|
|
.\" without specific prior written permission.
|
|
.\"
|
|
.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
|
|
.\"
|
|
.\" @(#)chroot.8 8.1 (Berkeley) 6/9/93
|
|
.\" $FreeBSD$
|
|
.\"
|
|
.Dd March 14, 2019
|
|
.Dt CHROOT 8
|
|
.Os
|
|
.Sh NAME
|
|
.Nm chroot
|
|
.Nd change root directory
|
|
.Sh SYNOPSIS
|
|
.Nm
|
|
.Op Fl G Ar group Ns Op Cm \&, Ns Ar group ...
|
|
.Op Fl g Ar group
|
|
.Op Fl u Ar user
|
|
.Ar newroot
|
|
.Op Ar command Op Ar arg ...
|
|
.Sh DESCRIPTION
|
|
The
|
|
.Nm
|
|
utility changes its current and root directories to the supplied directory
|
|
.Ar newroot
|
|
and then exec's
|
|
.Ar command
|
|
with provided arguments, if supplied,
|
|
or an interactive copy of the user's login shell.
|
|
.Pp
|
|
The options are as follows:
|
|
.Bl -tag -width "-G group[,group ...]"
|
|
.It Fl G Ar group Ns Op Cm \&, Ns Ar group ...
|
|
Run the command with the permissions of the specified groups.
|
|
.It Fl g Ar group
|
|
Run the command with the permissions of the specified
|
|
.Ar group .
|
|
.It Fl u Ar user
|
|
Run the command as the
|
|
.Ar user .
|
|
.El
|
|
.Sh ENVIRONMENT
|
|
The following environment variable is referenced by
|
|
.Nm :
|
|
.Bl -tag -width "SHELL"
|
|
.It Ev SHELL
|
|
If set,
|
|
the string specified by
|
|
.Ev SHELL
|
|
is interpreted as the name of
|
|
the shell to exec.
|
|
If the variable
|
|
.Ev SHELL
|
|
is not set,
|
|
.Pa /bin/sh
|
|
is used.
|
|
.El
|
|
.Sh EXAMPLES
|
|
.Bl -tag -width 0n
|
|
.It Sy Example 1\&: No Chrooting into a New Root Directory
|
|
.Pp
|
|
The following command opens the
|
|
.Xr csh 1
|
|
shell after chrooting to the standard root directory.
|
|
.Bd -literal -offset 2n
|
|
.Li # Ic chroot / /bin/csh
|
|
.Ed
|
|
.It Sy Example 2\&: No Execution of a Command with a Changed Root Directory
|
|
.Pp
|
|
The following command changes a root directory with
|
|
.Nm
|
|
and then runs
|
|
.Xr ls 1
|
|
to list the contents of
|
|
.Pa /sbin .
|
|
.Bd -literal -offset 2n
|
|
.Li # Ic chroot /tmp/testroot ls /sbin
|
|
.Ed
|
|
.El
|
|
.Sh SEE ALSO
|
|
.Xr chdir 2 ,
|
|
.Xr chroot 2 ,
|
|
.Xr setgid 2 ,
|
|
.Xr setgroups 2 ,
|
|
.Xr setuid 2 ,
|
|
.Xr getgrnam 3 ,
|
|
.Xr environ 7 ,
|
|
.Xr jail 8
|
|
.Sh HISTORY
|
|
The
|
|
.Nm
|
|
utility first appeared in
|
|
.Bx 4.4 .
|