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What is Naxsi?

NAXSI means Nginx Anti Xss & Sql Injection.

Technically, it is a third party nginx module, available as a package for many UNIX-like platforms. This module, by default, reads a small subset of simple rules (naxsi_core.rules) containing 99% of known patterns involved in websites vulnerabilities. For example, '<', '|' or 'drop' are not supposed to be part of a URI.

Being very simple, those patterns may match legitimate queries, it is Naxsi's administrator duty to add specific rules that will whitelist those legitimate behaviours. The administrator can either add whitelists manually by analyzing nginx's error log, or (recommended) start the project by an intensive auto-learning phase that will automatically generate whitelisting rules regarding website's behaviour.

In short, Naxsi behaves like a DROP-by-default firewall, the only job needed is to add required ACCEPT rules for the target website to work properly.

Why it is different?

On the contrary of most Web Application Firewall, Naxsi doesn't rely on a signature base, like an antivirus, and thus cannot be circumvented by an "unknown" attack pattern. Another main difference between Naxsi and other WAF, Naxsi filters Get & Posts resquests and is OpenSource and free to use for your company or personal own use (ie: as long as you don't resell a service or product based on Naxsi to customers).

Getting started

Wiki

See the wiki

Performance reviews

We need you !

  • Performance, stability testing: we are looking for independent reviews, benchmarks, and related feedback
  • Security testing: we prepared a running testing environment for you to play with. Go, play, (try to) bypass!
  • Post feature requests, documentation improvements
  • Bug reports: Naxsi is young, there are known bugs