So after an extended period of inactivity, I've finally decided to jump back into working on SoylentNews and rehash (the code that powers the site). As such, I've decided to scratch some long-standing itches. The first (and easiest) to deploy was HSTS to SoylentNews. What is HSTS you may ask?
HSTS stands for HTTP Strict Transport Security and is a special HTTP header that signifies that a site should only be connected to over HTTPS and causes the browser to automatically load encrypted versions of a website should it see a regular URL. We've forbid non-SSL connections to SN for over a year, but without HSTS in place, a man-in-the-middle downgrade attack was possible by intercepting the initial insecure page load.
One of the big views I have towards SoylentNews is we should be representative of "best practices" on the internet. To that end, we deployed IPv6 publicly last year, and went HTTPS-by-default not long after that. Deploying HSTS continues this trend, and I'm working towards implementing other good ideas that rarely seem to see the light of day.
Check past the break for more technical details.
As part of prepping for HSTS deployment, I went through every site in our public DNS records, and made sure they all have valid SSL certificates, and are redirecting to HTTPS by default. Much to my embarrassment, I found that several of our public facing sites lacked SSL support at all, or had self-signed certificates and broken SSL configurations. This has been rectified.
Let this be a lesson to everyone. While protecting your "main site" is always a good idea, make sure when going through and securing your infrastructure that you check every public IP and public hostname to make sure something didn't slip through the gaps. If you're running SSLLabs against your website, I highly recommend you scan all the subjectAlternativeNames listed in your certificate. Apache and nginx can provide different SSL options for different VHosts, and its very important to make sure all of them have a sane and consistent configuration.
Right now, HSTS is deployed only on the main site, without "includeSubdomains". The reason for this is I wanted to make sure I didn't miss any non-SSL capable sites, and I'm still working on getting our CentOS 6.7 box up to best-practices (unfortunately, the version of Apache it ships with is rather dated and doesn't support OSCP stapling. I'll be fixing this, but just haven't gotten around to it yet).
Once I've fixed that, and am happy with the state of the site, SN, and her subdomains will be submitted for inclusion into browser preload lists. I'll run an article when that submission happens and when we're accepted. I hope to have another article this week on backend tinkering and proposed site updates.
Until then, happy hacking!~ NCommander
It's actually been written up before, but the short version is we only use IPv4 in two places:
* A record traffic coming into the site (IPv4)
* A few legacy services that can't handle pure v6 (MySQL Cluster).
Internally, the site runs on a li694-22 gTLD. i.e., the current loadbalancer would be sodium.li694-22 (we're named after elmenets, starting at hydrogen and going up). Every machine only has an AAAA record, and the reverse PTR record. For services that *must* be on IPv4, we use ipv4.helium.li694-22. Using IPv6 primarily means everything is end-to-end addressesable and we avoid a nightmare with NAT. our IPv4 only services on the other hand can't scale outside of the current datacentre. That point is mostly moot though as the only off DC site we have is oxygen for backups.