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How we strengthened
authentication using Varnish
Luke Blaney
Financial Times
May 2013: We got hacked
Step 1: Multi-factor Authentication
Step 2: Single Sign On
Utilise existing services 

(Google Accounts & Active Directory for us)
Easy to use API
Catchy name
Staff Single Sign On
s3
o
Step 3: Roll it out EVERYWHERE
We used a three-pronged approach:
1. API which can be used for bespoke use-cases
2. Software libraries for common programming languages
3. Varnish integration as a catch-all for any web service
Varnish
Why use Varnish?
Application
Baddies
Authentication
Backdoor
Vulnerability
Application
Authentication
Backdoor
Vulnerability
Baddies
How?
Cron script checks the s3o public key every 5 mins
When it changes it gets substituted into VCL and varnish
reloaded
Lots of inline C to verify auth token really came from s3o
All wrapped up in a puppet module so it’s easy to deploy & reuse

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Financial times use case