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<TITLE>The Answer Guy 50: When AUTH is ident, not Authentication</TITLE>
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<H4>By James T. Dennis,
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<H3 align="left"><img src="../../gx/dennis/qbubble.gif"
height="50" width="60" alt="(?) " border="0"
>When AUTH is ident, not Authentication</H3>
<p><strong>From John Garetti on Tue, 18 Jan 2000
</strong></p>
<!-- ::
When AUTH is ident, not Authentication
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
:: -->
<P><STRONG>
Hi. My name is John. Wondering if there is a way to tell the
ftpd from Wash. Univ. to send authentication requests over the
same port as the main ftp port. It seems to be using port 113
which is driving my router admin people up the wall.
</STRONG></P>
<P><STRONG>
Thx.
</STRONG></P>
<BLOCKQUOTE><IMG SRC="../../gx/dennis/bbub.gif" ALT="(!)"
HEIGHT="28" WIDTH="50" BORDER="0"
>
The FTP daemon is actually doing an "ident" request
(which is laughingly called the "auth" protocol).
Search any good engine on the string "identd" or
the phrase "inetd daemon" for more details. For
the real guts of it look at the RFC that describes
it:
</BLOCKQUOTE>
<BLOCKQUOTE><DL><DT>
Identification Protocol
<DD><A HREF="http://www.faqs.org/rfcs/rfc1413.html"
>http://www.faqs.org/rfcs/rfc1413.html</A>
</DL></BLOCKQUOTE>
<BLOCKQUOTE>
This is not "authentication" like asking for a password or a
key or anything like that. It just asks the remote system
what username owns a given TCP socket and it is used for
logging. Obviously the remote system might respond with
anything. The result cannot be trusted unless the remote
system is known to be secure and under the same
administration as the FTP server.
</BLOCKQUOTE>
<BLOCKQUOTE>
Anyway you should be able to disable this behaviour and/or
block the port. This is especially important if you plan
to let MS Windows clients access this server (since they
don't support the ident/auth protocol, but the attempts
will cause significant connection delays).
</BLOCKQUOTE>
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>WUFTP and authentication</H3>
<p><strong>From John Garetti on Tue, 18 Jan 2000
</strong></p>
<p><strong>
thx for the info.
</strong></p>
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<BR>Published in <I>The Linux Gazette</I> Issue 50 February 2000</H5>
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