config BR2_PACKAGE_NGINX_NAXSI bool "nginx-naxsi" depends on BR2_PACKAGE_NGINX_HTTP # uses pcre, so nginx needs to be built with pcre support select BR2_PACKAGE_PCRE help 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 (and readable) rules containing 99% of known patterns involved in website 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 the Naxsi's administrator duty to add specific rules that will whitelist legitimate behaviours. The administrator can either add whitelists manually by analyzing nginx's error log, or (recommended) start the project with an intensive auto-learning phase that will automatically generate whitelisting rules regarding a website's behaviour. In short, Naxsi behaves like a DROP-by-default firewall, the only task is to add required ACCEPT rules for the target website to work properly. https://github.com/nbs-system/naxsi