Firewall Drift Detection via Golden Config Comparison
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Solution Overview
Problem
Firewall drift occurs when firewall rules are not identical across a network, leading to service disruptions and trust issues, as it often goes undetected until a failover test or real outage, causing manual checks and potential false negatives, and resulting in compromised user experience and increased costs.
Innovation Solution
A system and method for detecting and correcting firewall drift by extracting and comparing firewall rules across multiple firewalls, using a mapping of network sockets to process identifiers, and updating configuration data to ensure consistent access across all firewalls, thereby preventing service interruptions and enhancing network stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If manual checks and failover tests are used to detect firewall drift, then detection capability is provided, but detection timeliness deteriorates (detected only during outages or tests)
Solution Approach 1:
The system performs preliminary comparison of firewall rules against a golden configuration before failover occurs. By proactively detecting drift conditions during normal operation rather than waiting for outages or manual tests, the system enables early remediation while service remains uninterrupted.
2Reliability
If firewall rules are manually updated across multiple firewalls, then configuration consistency can be restored, but operational complexity and error risk increase
Solution Approach 1:
The system automatically generates and applies remediation configurations to restore consistency across firewalls. Instead of requiring manual intervention to update each firewall, the system self-corrects by comparing against the golden configuration and automatically applying necessary changes, eliminating human error and reducing operational burden.
Solution Approach 2:
The system continuously monitors firewall configurations, compares them against the golden configuration, and provides feedback when drift is detected. This feedback loop enables automated remediation by triggering configuration updates only when necessary, maintaining consistency without constant manual intervention.
3Loss of energy
If firewall drift is detected only during real network outages, then service disruption impact is maximized, but detection resource consumption is minimized
Solution Approach 1:
The system performs partial monitoring by comparing only critical firewall rules against the golden configuration rather than analyzing all possible configurations. This selective approach provides sufficient detection capability to maintain service continuity while consuming minimal computational resources during normal operation.
Data Source
AI summary
The present application relates to embodiments for detecting firewall drift. In some embodiments, a first set of firewall rules of a first firewall for a first instance of a distributed application, a second set of firewall rules of a second firewall for a second instance of the distributed application, and a mapping of IP addresses to identifiers of services from amongst a first set of services of the first instance and a second set of services of the second instance may be obtained. First connectivity data and second connectivity data may be generated indicating, for each of IP address associated with the first and second set of firewall rules, a respective port number over which communications between a respective IP address are transmitted, and generating comparison data indicating whether firewall drift is detected based on a comparison of the first connectivity data and the second connectivity data.