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    <p>As Burhan Khalid said. You don't want to try this in your code. It's not very performant and that's what firewalls are made for.</p> <pre><code>iptables -I INPUT -p tcp --dport $PORT -i eth0 -m state --state NEW -m recent --set iptables -I INPUT -p tcp --dport $PORT -i eth0 -m state --state NEW -m recent --update --seconds 600 --hitcount 2 -j DROP </code></pre> <p>This example is very usefull but not very handy. The problem is that you're also limiting good/trusted connections.</p> <p>You need to be more flexible. On a linux-based OS you can use fail2ban. It's a very handy tool to prevent your services of bruteforce attacks by using dynamic iptables rules. On Debian/Ubuntu you can install it by using apt-get. If you're on CentOS you need to use a third party repository.</p> <ol> <li><p>Log every connection into a logfile:</p> <blockquote> <pre><code>[Jun 3 03:52:23] server [pid]: Connect from 1.2.3.4 [Jun 3 03:52:23] server [pid]: Failed password for $USER from 1.2.3.4 port $DST [Jun 3 03:52:23] server [pid]: Connect from 2.3.4.5 [Jun 3 03:52:23] server [pid]: Successful login from 2.3.4.5 </code></pre> </blockquote></li> <li><p>Now monitor this file with fail2ban and define a regex to difference between successful and failed logins. Tell fail2ban how long it should block the IP for you and if you would like to get an email notification.</p></li> </ol> <p>The documentation is very good so have a look onto here how you have to configure fail2ban to monitor your logile: <a href="http://www.fail2ban.org/wiki/index.php/MANUAL_0_8#Filters" rel="nofollow">fail2ban docu</a></p> <p>You don't have to watch only for failed logins. You can also try to watch out for portscans. And the biggest win: don't only secure your application. Safe also your SSH, HTTP, etc logins for beeing bruteforced! ;)</p>
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