Get better visibility for the WAF with payload logging

Summary

The article discusses the enhancements made to Cloudflare's Web Application Firewall (WAF) through the implementation of payload logging, which improves visibility into the actions taken by the WAF. It highlights the challenges of false positives in security rules and the necessity for fine-tuning configurations based on logged data. The payload logging feature allows users to see which specific fields in HTTP requests triggered WAF actions, thereby reducing ambiguity and aiding in debugging and rule optimization. The article also details the technical underpinnings of the payload logging compiler, its integration with the Rulesets engine, and the improvements in logging efficiency and clarity.

Key Learnings

• 1Payload logging enhances visibility into WAF actions by logging specific fields that triggered rule matches.
• 2The improvements in the payload logging compiler reduce the volume of logged data, enhancing performance and clarity.
• 3Understanding the execution context of rules is crucial for debugging and optimizing WAF configurations.
• 4The use of dynamic arrays and caching in the payload logging compiler significantly reduces CPU usage and improves efficiency.
• 5Future enhancements aim to improve the handling of non-UTF-8 strings and explore more efficient serialization formats.

Who Should Read This

Senior Security Engineers implementing and optimizing Web Application Firewalls in high-traffic environments.

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