191 lines
5.5 KiB
Groff
191 lines
5.5 KiB
Groff
.\" $NetBSD: rlogin.1,v 1.3 1995/03/21 07:58:37 cgd Exp $
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.\"
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.\" Copyright (c) 1983, 1990, 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. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by the University of
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.\" California, Berkeley and its contributors.
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.\" 4. 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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.\" @(#)rlogin.1 8.1 (Berkeley) 6/6/93
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.\"
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.Dd June 6, 1993
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.Dt RLOGIN 1
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.Os BSD 4.2
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.Sh NAME
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.Nm rlogin
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.Nd remote login
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.Sh SYNOPSIS
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.Ar rlogin
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.Op Fl 8EKLdx
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.Op Fl e Ar char
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.Op Fl k Ar realm
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.Op Fl l Ar username
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.Op Fl p Ar portnumber
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.Ar host
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.Sh DESCRIPTION
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.Nm Rlogin
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starts a terminal session on a remote host
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.Ar host .
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.Pp
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.Nm Rlogin
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first attempts to use the Kerberos authorization mechanism, described below.
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If the remote host does not supporting Kerberos the standard Berkeley
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.Pa rhosts
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authorization mechanism is used.
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The options are as follows:
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.Bl -tag -width flag
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.It Fl 8
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The
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.Fl 8
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option allows an eight-bit input data path at all times; otherwise
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parity bits are stripped except when the remote side's stop and start
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characters are other than
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^S/^Q .
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.It Fl E
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The
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.Fl E
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option stops any character from being recognized as an escape character.
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When used with the
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.Fl 8
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option, this provides a completely transparent connection.
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.It Fl K
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The
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.Fl K
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option turns off all Kerberos authentication.
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.It Fl L
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The
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.Fl L
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option allows the rlogin session to be run in ``litout'' (see
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.Xr tty 4 )
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mode.
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.It Fl d
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The
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.Fl d
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option turns on socket debugging (see
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.Xr setsockopt 2 )
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on the TCP sockets used for communication with the remote host.
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.It Fl e
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The
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.Fl e
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option allows user specification of the escape character, which is
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``~'' by default.
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This specification may be as a literal character, or as an octal
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value in the form \ennn.
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.It Fl k
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The
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.FL k
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option requests rlogin to obtain tickets for the remote host
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in realm
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.Ar realm
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instead of the remote host's realm as determined by
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.Xr krb_realmofhost 3 .
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.It Fl x
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The
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.Fl x
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option turns on
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.Tn DES
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encryption for all data passed via the
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rlogin session.
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This may impact response time and
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.Tn CPU
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utilization, but provides
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increased security.
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.It Fl D
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Use the TCP nodelay option (see setsockopt(2)).
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.It Fl p portnumber
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Specifies the port number to connect to on the remote host.
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.El
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.Pp
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A line of the form ``<escape char>.'' disconnects from the remote host.
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Similarly, the line ``<escape char>^Z'' will suspend the
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.Nm rlogin
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session, and ``<escape char><delayed-suspend char>'' suspends the
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send portion of the rlogin, but allows output from the remote system.
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By default, the tilde (``~'') character is the escape character, and
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normally control-Y (``^Y'') is the delayed-suspend character.
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.Pp
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All echoing takes place at the remote site, so that (except for delays)
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the
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.Nm rlogin
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is transparent.
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Flow control via ^S/^Q and flushing of input and output on interrupts
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are handled properly.
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.Sh KERBEROS AUTHENTICATION
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Each user may have a private authorization list in the file
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.Pa .klogin
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in their home directory.
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Each line in this file should contain a Kerberos principal name of the
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form
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.Ar principal.instance@realm .
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If the originating user is authenticated to one of the principals named
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in
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.Pa .klogin ,
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access is granted to the account.
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The principal
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.Ar accountname.@localrealm
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is granted access if
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there is no
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.Pa .klogin
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file.
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Otherwise a login and password will be prompted for on the remote machine
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as in
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.Xr login 1 .
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To avoid certain security problems, the
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.Pa .klogin
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file must be owned by
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the remote user.
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.Pp
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If Kerberos authentication fails, a warning message is printed and the
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standard Berkeley
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.Nm rlogin
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is used instead.
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.Sh ENVIRONMENT
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The following environment variable is utilized by
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.Nm rlogin :
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.Bl -tag -width TERM
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.It Ev TERM
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Determines the user's terminal type.
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.El
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.Sh SEE ALSO
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.Xr rsh 1 ,
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.Xr kerberos 3 ,
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.Xr krb_sendauth 3 ,
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.Xr krb_realmofhost 3
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.Sh HISTORY
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The
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.Nm rlogin
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command appeared in
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.Bx 4.2 .
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.Sh BUGS
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.Nm Rlogin
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will be replaced by
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.Xr telnet 1
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in the near future.
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.Pp
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More of the environment should be propagated.
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