a4098bf15f
git-svn-id: svn://svn.h5l.se/heimdal/trunk/heimdal@11367 ec53bebd-3082-4978-b11e-865c3cabbd6b
236 lines
4.7 KiB
Groff
236 lines
4.7 KiB
Groff
.\" $Id$
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.\"
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.Dd September 4, 2002
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.Dt RSH 1
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.Os HEIMDAL
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.Sh NAME
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.Nm rsh
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.Nd
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remote shell
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.Sh SYNOPSIS
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.Nm
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.Op Fl 45FGKdefnuxz
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.Op Fl U Pa string
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.Op Fl p Ar port
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.Op Fl l Ar username
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.Op Fl P Ar N|O
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.Ar host [command]
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.Sh DESCRIPTION
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.Nm
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authenticates to the
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.Xr rshd 8
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daemon on the remote
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.Ar host ,
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and then executes the specified
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.Ar command .
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.Pp
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.Nm
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copies its standard input to the remote command, and the standard
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output and error of the remote command to its own.
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.Pp
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Valid options are:
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.Bl -tag -width Ds
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.It Xo
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.Fl 4 ,
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.Fl -krb4
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.Xc
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The
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.Fl 4
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option requests Kerberos 4 authentication. Normally all supported
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authentication mechanisms will be tried, but in some cases more
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explicit control is desired.
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.It Xo
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.Fl 5 ,
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.Fl -krb5
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.Xc
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The
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.Fl 5
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option requests Kerberos 5 authentication. This is analogous to the
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.Fl 4
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option.
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.It Xo
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.Fl K ,
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.Fl -broken
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.Xc
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The
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.Fl K
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option turns off all Kerberos authentication. The long name implies
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that this is more or less totally unsecure. The security in this mode
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relies on reserved ports, which is not very secure.
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.It Xo
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.Fl n ,
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.Fl -no-input
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.Xc
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The
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.Fl n
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option directs the input from the
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.Pa /dev/null
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device (see the
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.Sx BUGS
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section of this manual page).
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.It Xo
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.Fl e ,
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.Fl -no-stderr
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.Xc
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Don't use a separate socket for the stderr stream. This can be
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necessary if rsh-ing through a NAT bridge.
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.It Xo
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.Fl x ,
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.Fl -encrypt
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.Xc
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The
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.Fl x
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option enables encryption for all data exchange. This is only valid
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for Kerberos authenticated connections (see the
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.Sx BUGS
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section for limitations).
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.It Xo
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.Fl z
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.Xc
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The opposite of
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.Fl x .
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This is the default, but encryption can be enabled when using
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Kerberos 5, by setting the
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.Li libdefaults/encrypt
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option in
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.Xr krb5.conf 5 .
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.It Xo
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.Fl f ,
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.Fl -forward
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.Xc
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Forward Kerberos 5 credentials to the remote host. Also controlled by
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.Li libdefaults/forward
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in
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.Xr krb5.conf 5 .
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.It Xo
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.Fl G
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.Xc
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The opposite of
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.Fl f .
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.It Xo
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.Fl F ,
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.Fl -forwardable
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.Xc
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Make the forwarded credentials re-forwardable. Also controlled by
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.Li libdefaults/forwardable
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in
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.Xr krb5.conf 5 .
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.It Xo
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.Fl u ,
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.Fl -unique
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.Xc
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Make sure the remote credentials cache is unique, that is, don't reuse
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any existing cache. Mutually exclusive to
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.Fl U .
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.It Xo
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.Fl U Pa string ,
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.Fl -tkfile= Ns Pa string
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.Xc
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Name of the remote credentials cache. Mutually exclusive to
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.Fl u .
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.It Xo
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.Fl p Ar number-or-service ,
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.Fl -port= Ns Ar number-or-service
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.Xc
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Connect to this port instead of the default (which is 514 when using
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old port based authentication, 544 for Kerberos 5 and non-encrypted
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Kerberos 4, and 545 for encrytpted Kerberos 4; subject of course to
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the contents of
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.Pa /etc/services ) .
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.It Xo
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.Fl l Ar string ,
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.Fl -user= Ns Ar string
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.Xc
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By default the remote username is the same as the local. The
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.Fl l
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option or the
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.Pa username@host
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format allow the remote name to be specified.
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.It Xo
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.Fl P Ar N|O|1|2 ,
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.Fl -protocol= Ns Ar N|O|1|2
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.Xc
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Specifies which protocol version to use with Kerberos 5.
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.Ar N
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and
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.Ar 2
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selects protocol version 2, while
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.Ar O
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and
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.Ar 1
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selects version 1. Version 2 is beleived to be more secure, and is the
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default. Unless asked for a specific version,
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.Nm
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will try both. This behaviour may change in the future.
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.El
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.\".Pp
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.\"Without a
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.\".Ar command
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.\".Nm
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.\"will just exec
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.\".Xr rlogin 1
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.\"with the same arguments.
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.Sh EXAMPLES
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Care should be taken when issuing commands containing shell meta
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characters. Without quoting, these will be expanded on the local
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machine.
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.Pp
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The following command:
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.Pp
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.Dl rsh otherhost cat remotefile > localfile
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.Pp
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will write the contents of the remote
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.Pa remotefile
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to the local
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.Pa localfile ,
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but:
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.Pp
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.Dl rsh otherhost 'cat remotefile > remotefile2'
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.Pp
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will write it to the remote
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.Pa remotefile2 .
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.\".Sh ENVIRONMENT
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.Sh FILES
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.Bl -tag -width /etc/hosts -compact
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.It Pa /etc/hosts
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.El
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.\".Sh DIAGNOSTICS
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.Sh SEE ALSO
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.Xr rlogin 1 ,
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.Xr krb_realmofhost 3 ,
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.Xr krb_sendauth 3 ,
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.Xr hosts.equiv 5 ,
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.Xr krb5.conf 5 ,
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.Xr rhosts 5 ,
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.Xr kerberos 8
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.Xr rshd 8
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.\".Sh STANDARDS
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.Sh HISTORY
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The
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.Nm
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command appeared in
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.Bx 4.2 .
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.Sh AUTHORS
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This implementation of
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.Nm
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was written as part of the Heimdal Kerberos 5 implementation.
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.Sh BUGS
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Some shells (notably
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.Xr csh 1 )
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will cause
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.Nm
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to block if run in the background, unless the standard input is directed away from the terminal. This is what the
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.Fl n
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option is for.
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.Pp
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The
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.Fl x
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options enables encryption for the session, but for both Kerberos 4
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and 5 the actual command is sent unencrypted, so you should not send
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any secret information in the command line (which is probably a bad
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idea anyway, since the command line can usually be read with tools
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like
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.Xr ps 1 ) .
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Forthermore in Kerberos 4 the command is not even integrity
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protected, so anyone with the right tools can modify the command.
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