Leigh S. Jones, KR6X writes:
« HTML content follows »I'm getting fed up with my bandwidth being gobbled up by numerous attackers running dictionary attacks on my users passwords for pop3 and imap logins. To that end, I'm hoping to enlist the aid of couriertcpd. The way I understand it, I need to build an access file with IP addresses followed by a tab then the keyword deny, compile it into a binary database using a script similar to makesmtpaccess, probably this would invoke /usr/lib/courier/courier/makedatprog through the script /usr/lib/courier/makedat, and then add the line "-access=[filename.dat]" in /etc/init.d/pop3d, etc., pointing to my database when invoking the daemons. Have I got this all correctly?
Yes. There's a script called 'makedat' that's a generic version of makesmtpaccess, that you can use.
Having said all that -- this is a losing battle. You'll spend the rest of your life maintaining this list manually, so you should cobble together some script that parses the log files, and inserts IP addresses into the blacklist.
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