ModSecurity is an open source, cross platform web application firewall (WAF) engine for Apache, IIS and Nginx that is developed by Trustwave's SpiderLabs. It has a robust event-based programming language which provides protection from a range of attacks against web applications and allows for HTTP traffic monitoring, logging and real-time analysis. With over 10,000 deployments world-wide, ModSecurity is the most widely deployed WAF in existence.
ModSecurity (v3/master): https://github.com/SpiderLabs/ModSecurity
ModSecurity v3 Nginx Connector
ModSecurity Connector: https://github.com/SpiderLabs/ModSecurity-nginx
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OWASP ModSecurity Core Rule Set (Official Repository)
CRS (v3.3/master): https://github.com/coreruleset/coreruleset.git
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