Security

SSL Configuration

As you may have noticed, this site is now served over HTTPS!

IE6 users, you’re pretty much SOL since I turned off all your cipher suites. It’s 2014 and it’s probably a pretty good time to get yourself a slightly newer browser anyway.


Read more

Share Comments

Blocking web traffic behind an Elastic Load Balancer (ELB)

Over the past few hours we’ve been on the receiving end of a fairly large scale set of web requests (read: attack) to a website we host over on Amazon EC2. Our setup is not really that complicated, however we encountered a problem that wasn’t that easy to solve.


Read more

Share Comments

Puppet Modules - Debsecan

This is the first post of (hopefully) many, detailing some of my Puppet module implementations. Being the first, I thought I would start off with something simple.


Read more

Share Comments

Using ferm to build firewall rulesets

This post is thanks to a suggestion from JP Viljoen to check out ferm. Well, I did, and it’s fairly neat. You get to express your firewall configuration in structures resembling simple C code along with using things like arrays, functions and if / else constructs which makes building complex rulesets quite a simple task.

I’ve included an example configuration below of one of my machines. The network configuration is not extremely complex, but there is a mix of IPv4, IPv6 and - as this is an IRC server - some DNAT to make the IRC service available on a number of other privileged ports without having the service actually listen on those ports. This particular server is running Debian however ferm is basically just a front to ip(6)tables so it’ll run pretty much anywhere that runs.


Read more

Share Comments