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<TITLE>The Answer Guy 55: Disabling Anonymous FTP</TITLE>
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<H3 align="left"><img src="../../gx/dennis/qbubble.gif"
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>Disabling Anonymous FTP</H3>
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<p><strong>From Aung Win Thu on Tue, 06 Jun 2000
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</strong></p>
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<!-- ::
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Disabling Anonymous FTP
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~~~~~~~~~~~~~~~~~~~~~~~
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:: -->
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<P><STRONG>
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Dear Dennis
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</STRONG></P>
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<P><STRONG>
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I have installed Linux Redhat 6.0 on my intel machine. I want to
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disable anonymous login to my ftp site. how can i do it? Thaks for
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your help.
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</STRONG></P>
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<P><STRONG>
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Aung
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</STRONG></P>
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<BLOCKQUOTE><IMG SRC="../../gx/dennis/bbub.gif" ALT="(!)"
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HEIGHT="28" WIDTH="50" BORDER="0"
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>
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Traditional FTP daemons used the existence of an account named
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"ftp" (an ftp:... entry in the <TT>/etc/passwd</TT> file) as a flag to
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enabled anonymous FTP.
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</BLOCKQUOTE>
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<BLOCKQUOTE>
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If you're using a plain old BSD port of ftpd you could just
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remove that user. There are various other FTP daemons such as
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WU-ftpd (originally from Washington University in St Louis,
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wustl.edu), NCFTPd (by Mike Gleason, author of the ncftp
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client) and ProFTPd (<A HREF="http://www.proftpd.net"
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>http://www.proftpd.net</A>). Each of those
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supports some way of enabling anonymous FTP <TT>---</TT> so all you have
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to do is reverse those steps to "disable" it.
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</BLOCKQUOTE>
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<BLOCKQUOTE>
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I also recommend that you use TCP wrappers (edit your
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<TT>/etc/hosts.allow</TT> and <TT>/etc/hosts.deny</TT> files) to limit whence
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FTP connections are accepted. In other words, start with
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ALL: ALL in your <TT>/etc/hosts.deny</TT> and add the networks and
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IP address patterns (and/or domain name patterns) from which
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you will allow you users to access your site.
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</BLOCKQUOTE>
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<BLOCKQUOTE>
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Personally I'd like to see FTP fade away in favor of
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SSH or more secure protocols. (Although it may be more of
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a race between the secure protocols at the applications
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level and the transparently secure protocols in IPSec
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<A HREF="http://www.xs4all.nl/~freeswan/">FreeS/WAN</A>).
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</BLOCKQUOTE>
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<H5 align="center"><a href="http://www.linuxgazette.com/copying.html"
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>Copyright ©</a> 2000, James T. Dennis
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<BR>Published in <I>The Linux Gazette</I> Issue 55 July 2000</H5>
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