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-.\" 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. All advertising materials mentioning features or use of this software
-.\"    must display the following acknowledgement:
-.\"	This product includes software developed by the University of
-.\"	California, Berkeley and its contributors.
-.\" 4. 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.
-.\"
-.\"     @(#)rexecd.8	8.2 (Berkeley) 12/11/93
-.\" $FreeBSD$
-.\"
-.Dd September 23, 1994
-.Dt REXECD 8
-.Os
-.Sh NAME
-.Nm rexecd
-.Nd remote execution server
-.Sh SYNOPSIS
-.Nm
-.Op Fl i
-.Sh DESCRIPTION
-The
-.Nm
-utility is the server for the
-.Xr rexec 3
-routine.
-The server provides remote execution facilities
-with authentication based on user names and
-passwords.
-.Pp
-The
-.Nm
-utility 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
-The
-.Nm
-utility 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 CAVEATS
-The
-.Nm
-utility will not allow root logins unless the
-.Fl i
-option is given on the command line (typically in
-.Pa /etc/inetd.conf ) .
-It will also disallow access for users listed in
-.Pa /etc/ftpusers ,
-or users with no passwords, which were all serious security holes.
-The entire concept of rexec/rexecd is a major security hole and an example
-of how not to do things.
-The
-.Nm
-utility is disabled by default in
-.Pa /etc/inetd.conf .
-.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 1
-command 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
-utility appeared in
-.Bx 4.2 .
-.Sh BUGS
-A facility to allow all data and password exchanges to be encrypted should be
-present.