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+.\"	$NetBSD: rexecd.8,v 1.13 2017/07/03 21:35:49 wiz Exp $
+.\"
+.\" Copyright (c) 1983, 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.
+.\"
+.\"     from: @(#)rexecd.8	8.3 (Berkeley) 6/1/94
+.\"
+.Dd June 1, 1994
+.Dt REXECD 8
+.Os
+.Sh NAME
+.Nm rexecd
+.Nd remote execution server
+.Sh SYNOPSIS
+.Nm
+.Sh DESCRIPTION
+.Nm
+is the server for the
+.Xr rexec 3
+routine.
+The server provides remote execution facilities with authentication
+based on user names and passwords.
+.Pp
+.Nm
+listens for service requests at the port indicated in
+the ``exec'' service specification; see
+.Xr services 5 .
+When a service request is received the following protocol
+is initiated:
+.Bl -enum
+.It
+The server reads characters from the socket up to a NUL
+.Pq Ql \e0
+byte.
+The resultant string is interpreted as an
+.Tn ASCII
+number, base 10.
+.It
+If the number received in step 1 is non-zero,
+it is interpreted as the port number of a secondary
+stream to be used for the
+.Em stderr .
+A second connection is then created to the specified
+port on the client's machine.
+.It
+A NUL terminated user name of at most 16 characters
+is retrieved on the initial socket.
+.It
+A NUL terminated, unencrypted password of at most
+16 characters is retrieved on the initial socket.
+.It
+A NUL terminated command to be passed to a
+shell is retrieved on the initial socket.
+The length of the command is limited by the upper bound on the size
+of the system's argument list.
+.It
+.Nm
+then validates the user as is done at login time and, if the
+authentication was successful, changes to the user's home directory,
+and establishes the user and group protections of the user.
+If any of these steps fail the connection is
+aborted with a diagnostic message returned.
+.It
+A NUL byte is returned on the initial socket and the command line
+is passed to the normal login shell of the user.
+The shell inherits the network connections established by
+.Nm .
+.El
+.Sh DIAGNOSTICS
+Except for the last one listed below,
+all diagnostic messages are returned on the initial socket,
+after which any network connections are closed.
+An error is indicated by a leading byte with a value of
+1 (0 is returned in step 7 above upon successful completion
+of all the steps prior to the command execution).
+.Pp
+.Bl -tag -width Ds
+.It Sy username too long
+The name is
+longer than 16 characters.
+.It Sy password too long
+The password is longer than 16 characters.
+.It Sy command too long
+The command line passed exceeds the size of the argument
+list (as configured into the system).
+.It Sy Login incorrect.
+No password file entry for the user name existed.
+.It Sy Password incorrect.
+The wrong password was supplied.
+.It Sy \&No remote directory.
+The
+.Xr chdir 2
+to the home directory failed.
+.It Sy Try again.
+A
+.Xr fork 2
+by the server failed.
+.It Sy <shellname>: ...
+The user's login shell could not be started.
+This message is returned
+on the connection associated with the
+.Em stderr ,
+and is not preceded by a flag byte.
+.El
+.Sh SEE ALSO
+.Xr rexec 3
+.Sh HISTORY
+The
+.Nm
+command appeared in
+.Bx 4.2 .
+.Sh BUGS
+Indicating ``Login incorrect'' as opposed to ``Password incorrect''
+is a security breach which allows people to probe a system for users
+with null passwords.
+.Pp
+A facility to allow all data and password exchanges to be encrypted should be
+present.
+.Sh SECURITY CONSIDERATIONS
+As the passwords exchanged by the client and
+.Nm
+are not encrypted, it is
+.Em strongly
+recommended that this service is not enabled.