Protecting your site and your clients
Site Security Policy
Site Security Policy is an interesting approach that is still in the formative stages . The idea is that a web server hosts a file that specifies how a client should interact with the server, thus preventing unsafe interactions such as cross-site scripting (XSS) attacks or cross-site request forgery attacks. On the client side, there is either built-in support for this standard, or a plugin – available for Firefox – that allows the client to download and parse the policy file before interacting with the web server.
One interesting side effect to this approach is the possibility of having web proxies such as Squid support the standard, in effect protecting all the web clients behind them from potentially unsafe actions at sites that choose to support the Site Security Policy standard.
Web security has no simple solution: No matter how hard we try, the bad guys will either run hostile web servers or compromise other web servers. On the client side, things are basically a disaster. If you are running Linux, however, chances are quite low that you will be targeted, and chances are good that you keep your software up to date because almost all distributions update automatically by default, thus putting you ahead of the game!
By plugging the holes as they are identified and by applying additional security measures – such as NoScript and ModSecurity – you can improve the chances of "healthy" servers and clients staying that way.
Ultimately, this reduces the time and energy you have to spend on repetitive cleanup, which is something everybody wants, anyway.
- NoScript plugin for Firefox: http://noscript.net/
- ModSecurity for Apache: http://www.modsecurity.org/
- Site Security Policy: http://people.mozilla.com/~bsterne/site-security-policy/
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