Christopher Morrow <morrowc.li...@gmail.com> wrote: >On Thu, Aug 29, 2013 at 10:50 AM, Don Wilder <don.wil...@gmail.com> >wrote: >> I wrote a script in Linux that watches for unauthorized login >attempts and >> adds the ip address to the blocked list in my firewall. You might >want to >> search sourceforge for a DYN Firewall and modify it from there. >> > >because fail2ban was too hard to install? or because you just wanted >to test yourself?
Actually I did the same. I use ipset lists (generally with a timeout) and take a regex or two and black / white list from a YAML file and just take (possibly multiple inputs) from piping tail -F. I also store addresses for future reference (by the script or otherwise). This is quite maintainable as I can look at a list of people who have attacked the mail server and compare it to web attacks. Each process is a different type of service (different config file) and probably a different ipset. Due to ipset not actually doing anything until I make an iptables rule for it, I can run my script in a test mode (by default) and just see what happens (check it's logs and the ipset list it generates). I haven't found the need for this yet but I can use cymru to look up how big their net is (see geocidr for an example of how to do this in perl) and use a hash:net ipset type and cover a whole net. Basically what I'm saying in doing it this way is quite expandable and isn't very hard and I can do tons of stuff that fail2ban can't (I don't think - it's been a while since I looked).
