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-.\" Copyright (c) 2002 - 2003 Kungliga Tekniska H�gskolan
-.\" (Royal Institute of Technology, Stockholm, Sweden). 
-.\" 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 Institute 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 INSTITUTE 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 INSTITUTE 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. 
-.\" 
-.\"	$Id: rsh.1 13394 2004-02-20 12:21:42Z joda $
-.\"
-.Dd February 20, 2004
-.Dt RSH 1
-.Os HEIMDAL
-.Sh NAME
-.Nm rsh
-.Nd
-remote shell
-.Sh SYNOPSIS
-.Nm
-.Op Fl 45FGKdefnuxz
-.Op Fl U Pa string
-.Op Fl p Ar port
-.Op Fl l Ar username
-.Op Fl P Ar N|O
-.Ar host [command]
-.Sh DESCRIPTION
-.Nm
-authenticates to the
-.Xr rshd 8
-daemon on the remote
-.Ar host ,
-and then executes the specified
-.Ar command .
-.Pp
-.Nm
-copies its standard input to the remote command, and the standard
-output and error of the remote command to its own.
-.Pp
-Valid options are:
-.Bl -tag -width Ds
-.It Xo
-.Fl 4 ,
-.Fl -krb4
-.Xc
-The
-.Fl 4
-option requests Kerberos 4 authentication. Normally all supported
-authentication mechanisms will be tried, but in some cases more
-explicit control is desired.
-.It Xo
-.Fl 5 ,
-.Fl -krb5
-.Xc
-The
-.Fl 5
-option requests Kerberos 5 authentication. This is analogous to the
-.Fl 4
-option.
-.It Xo
-.Fl K ,
-.Fl -broken
-.Xc
-The
-.Fl K
-option turns off all Kerberos authentication. The security in this
-mode relies on reserved ports. The long name is an indication of how
-good this is.
-.It Xo
-.Fl n ,
-.Fl -no-input
-.Xc
-The
-.Fl n
-option directs the input from the
-.Pa /dev/null
-device (see the
-.Sx BUGS
-section of this manual page).
-.It Fl d
-Enable
-.Xr setsockopt 2
-socket debugging.
-.It Xo
-.Fl e ,
-.Fl -no-stderr
-.Xc
-Don't use a separate socket for the stderr stream. This can be
-necessary if rsh-ing through a NAT bridge.
-.It Xo
-.Fl x ,
-.Fl -encrypt
-.Xc
-The
-.Fl x
-option enables encryption for all data exchange. This is only valid
-for Kerberos authenticated connections (see the
-.Sx BUGS
-section for limitations).
-.It Xo
-.Fl z
-.Xc
-The opposite of
-.Fl x .
-This is the default, and is mainly useful if encryption has been
-enabled by default, for instance in the
-.Li appdefaults
-section of 
-.Pa /etc/krb5.conf
-when using Kerberos 5.
-.It Xo
-.Fl f ,
-.Fl -forward
-.Xc
-Forward Kerberos 5 credentials to the remote host.
-Also settable via
-.Li appdefaults
-(see
-.Xr krb5.conf ) .
-.It Xo
-.Fl F ,
-.Fl -forwardable
-.Xc
-Make the forwarded credentials re-forwardable. 
-Also settable via
-.Li appdefaults
-(see
-.Xr krb5.conf ) .
-.It Xo
-.Fl l Ar string ,
-.Fl -user= Ns Ar string
-.Xc
-By default the remote username is the same as the local. The
-.Fl l
-option or the
-.Pa username@host
-format allow the remote name to be specified.
-.It Xo
-.Fl n ,
-.Fl -no-input
-.Xc
-Direct input from 
-.Pa /dev/null
-(see the
-.Sx BUGS
-section).
-.It Xo
-.Fl p Ar number-or-service ,
-.Fl -port= Ns Ar number-or-service
-.Xc
-Connect to this port instead of the default (which is 514 when using
-old port based authentication, 544 for Kerberos 5 and non-encrypted
-Kerberos 4, and 545 for encrytpted Kerberos 4; subject of course to
-the contents of
-.Pa /etc/services ) .
-.It Xo
-.Fl P Ar N|O|1|2 ,
-.Fl -protocol= Ns Ar N|O|1|2
-.Xc
-Specifies the protocol version to use with Kerberos 5.
-.Ar N
-and
-.Ar 2
-select protocol version 2, while 
-.Ar O
-and
-.Ar 1
-select version 1. Version 2 is believed to be more secure, and is the
-default. Unless asked for a specific version,
-.Nm
-will try both.  This behaviour may change in the future.
-.It Xo
-.Fl u ,
-.Fl -unique
-.Xc
-Make sure the remote credentials cache is unique, that is, don't reuse
-any existing cache. Mutually exclusive to
-.Fl U .
-.It Xo
-.Fl U Pa string ,
-.Fl -tkfile= Ns Pa string
-.Xc
-Name of the remote credentials cache. Mutually exclusive to
-.Fl u .
-.It Xo
-.Fl x ,
-.Fl -encrypt
-.Xc
-The
-.Fl x
-option enables encryption for all data exchange. This is only valid
-for Kerberos authenticated connections (see the
-.Sx BUGS
-section for limitations).
-.It Fl z
-The opposite of
-.Fl x .
-This is the default, but encryption can be enabled when using
-Kerberos 5, by setting the
-.Li libdefaults/encrypt
-option in
-.Xr krb5.conf 5 .
-.El
-.\".Pp
-.\"Without a
-.\".Ar command
-.\".Nm
-.\"will just exec
-.\".Xr rlogin 1
-.\"with the same arguments.
-.Sh EXAMPLES
-Care should be taken when issuing commands containing shell meta
-characters. Without quoting, these will be expanded on the local
-machine.
-.Pp
-The following command:
-.Pp
-.Dl rsh otherhost cat remotefile \*[Gt] localfile
-.Pp
-will write the contents of the remote
-.Pa remotefile
-to the local
-.Pa localfile ,
-but:
-.Pp
-.Dl rsh otherhost 'cat remotefile \*[Gt] remotefile2'
-.Pp
-will write it to the remote
-.Pa remotefile2 .
-.\".Sh ENVIRONMENT
-.Sh FILES
-.Bl -tag -width /etc/hosts -compact
-.It Pa /etc/hosts
-.El
-.\".Sh DIAGNOSTICS
-.Sh SEE ALSO
-.Xr rlogin 1 ,
-.Xr krb_realmofhost 3 ,
-.Xr krb_sendauth 3 ,
-.Xr hosts.equiv 5 ,
-.Xr krb5.conf 5 ,
-.Xr rhosts 5 ,
-.Xr kerberos 8
-.Xr rshd 8
-.\".Sh STANDARDS
-.Sh HISTORY
-The
-.Nm
-command appeared in
-.Bx 4.2 .
-.Sh AUTHORS
-This implementation of
-.Nm
-was written as part of the Heimdal Kerberos 5 implementation.
-.Sh BUGS
-Some shells (notably
-.Xr csh 1 )
-will cause
-.Nm
-to block if run in the background, unless the standard input is directed away from the terminal. This is what the
-.Fl n
-option is for.
-.Pp
-The
-.Fl x
-options enables encryption for the session, but for both Kerberos 4
-and 5 the actual command is sent unencrypted, so you should not send
-any secret information in the command line (which is probably a bad
-idea anyway, since the command line can usually be read with tools
-like
-.Xr ps 1 ) .
-Forthermore in Kerberos 4 the command is not even integrity
-protected, so anyone with the right tools can modify the command.