Sunday, 4 April 2010

Secure Your Website, Put Bouncers at the Door (Part 1)

A good website is much like a nightclub, we want the general population to be able to use the facilities freely (or for a nominal fee!) but we don’t want the trouble makers that will spoil it for everyone.   Pushing the analogy further, nightclubs have a few different types of security in place:

Visibility Implementation Mitigates
High Profile Bouncers
Filter out trouble makers at point of entry
  Internal Security Eject people that become troublemakers
Low Profile Bars on Windows
Alarmed Exits
Prevent people sneaking in
  Metal Detectors
Security Cameras
Passively check for people about to cause trouble

As web developers we have a very similar set of tools that we can use to secure our website:

Visibility Implementation Mitigates
High Profile Input Validation
(Metal Detectors)
Filters out bad information early
  Authentication
(Bouncer)
On allow members on to the site
  HTTPS
(Bars on Windows)
Prevent people monitoring user traffic
Low Profile Input Sanitation
(Security Cameras)
Filter out bad requests
  Robots.txt
(Bars on Windows)
Hide sensitive pages from popular web spiders
  Network Segregation and Infrastructure
(Alarmed Exits )
Control access to sensitive information

There’s lots of information out there about configuring the High Profile security measures and Network Segregation and Infrastructure is best implemented by the network specialists (it doesn’t hurt to understand the basics) and these things are generally well implemented.

As web developers, we have to worry about the things that happen inside the website, making sure that the front entrance is the only way in and limiting the damage if someone does get in.  So our implementation priorities for any website have to be:

  1. Input Validation – every piece of information that comes from the client is suspect and should be validated, this includes query string, form fields (even hidden ones!) and cookie values
  2. Input Sanitation  - ensure the any inject SQL or XSS script is neutralised
  3. Robots.txt – it may not be a bullet proof defence if someone’s targeting your site, but at least you can minimise drive-by hacking through Google!
  4. Authentication – allow only authorised users through
  5. HTTPS – secure the traffic from client to server

In Part 2, I’ll go over some of the best practises that we can follow, as developers, to make our website secure.

1 comment:

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    ReplyDelete

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