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<TITLE>The Answer Guy 36:
Getting 'rsh' to work
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<H4>"The Linux Gazette...<I>making Linux just a little more fun!</I>"</H4>
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<H1><A NAME="answer">
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<H4>By James T. Dennis,
<a href="mailto:answerguy@ssc.com">answerguy@ssc.com</a><BR>
Starshine Technical Services,
<A HREF="http://www.starshine.org/">http://www.starshine.org/</A>
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<H3 align="left"><img src="../../gx/dennis/qbubble.gif" height="50" width="60"
alt="(?) " border="0">
Getting 'rsh' to work
</H3>
<p><strong>From Anthony Howe on Mon, 14 Dec 1998
</strong></p>
<!-- ::
Getting 'rsh' to work
~~~~~~~~~~~~~~~~~~~~~
:: -->
<P><STRONG><IMG SRC="../../gx/dennis/qbub.gif" ALT="(?)"
HEIGHT="28" WIDTH="50" BORDER="0"
>
Oh hum. I'm having trouble with getting rsh to work between two
machines for a specific task. I've read the rsh, tcpd, and hosts.allow
man pages and I still can't get it to work.
</STRONG></P>
<p><strong><OL>
<li>the same user "joe" with the same password exists on both "client"
and "server" machines.
<li>server's hosts.deny:
<br><tt>ALL:ALL</tt>
<li>server's hosts.allow:
<br><tt>in.rshd:1.2.3.4</tt>
<li>server's inetd.conf:
<br>"shell" line uncommented
<li>I have an A record for:
<br><tt>client A 1.2.3.4</tt>
<li>and I have a PTR record for:
<br><tt>4.3.2.1.in-addr.arpa PTR client</tt>
</OL>
Now every time I try and do something as simple as:
</strong></p>
<Pre><STRONG>joe@client$ rsh server '/bin/ls /home/joe'</STRONG></Pre>
<P><STRONG>
I get "Permission denied". The logs on neither client nor server
provide no reason for the "Permission denied".
</STRONG></P>
<P><STRONG>
Maybe I just over-tired, but I can't figure out what I'm overlooking.
Can anyone please tell me what I'm missing?
</STRONG></P>
<BLOCKQUOTE><IMG SRC="../../gx/dennis/bbub.gif" alt="(!)"
HEIGHT="28" WIDTH="50" BORDER="0"
>
What is the precise line in your <TT>/etc/inetd.conf?</TT>
</BLOCKQUOTE>
<BLOCKQUOTE>
Some versions of in.rshd and in.rlogind have options
which force the daemon to ignore .rhosts files (-l)
allow 'superuser' access (-h), syslog all access
attempts (-L), and perform "double reverse lookups"
(-a).
</BLOCKQUOTE>
<BLOCKQUOTE>
It looks like your forward and reverse records are alright
(assuming that the client's <TT>/etc/resolv.conf</TT> is pointing
at a name server that recognized the authority for the
zones you're using).
</BLOCKQUOTE>
<BLOCKQUOTE>
Note: If you are going through IP Masquerading at some point
(some sort of proxy/firewall package) then there's also the
remote chance that your source port is being remapped to
some unprivileged (>1024) port as the packets are re-written
by your masquerading/NAT router.
</BLOCKQUOTE>
<BLOCKQUOTE>
I did complain to the Linux/GNU maintainers of the
rshd/rlogind package about the fact that their syslog
messages don't provide more detailed errors on denial.
However, I'm not enough of a coder to supply patches.
</BLOCKQUOTE>
<BLOCKQUOTE>
To test this without TCP Wrappers at all try
commenting out the line that looks something like:
</BLOCKQUOTE>
<blockquote><pre>shell stream tcp nowait root /usr/sbin/tcpd in.rshd -a
</pre></blockquote><BLOCKQUOTE>
... and replacing it with something like:
</BLOCKQUOTE>
<blockquote><pre>shell stream tcp nowait root /usr/sbin/in.rshd in.rshd -L
</pre></blockquote><BLOCKQUOTE>
(note: we just changed the tcpd to refer to rshd).
</BLOCKQUOTE>
<!-- sig -->
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<H5 align="center"><a href="http://www.linuxgazette.com/ssc.copying.html"
>Copyright ©</a> 1999, James T. Dennis
<BR>Published in <I>The Linux Gazette</I> Issue 36 January 1999</H5>
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