PolicyVis: Firewall security policy visualization and inspection

Firewalls have an important role in network security. However, managing firewall policies is an extremely complex task because the large number of interacting rules in single or distributed firewalls significantly increases the possibility of policy misconfiguration and network vulnerabilities. Moreover, due to low-level representation of firewall rules, the semantic of firewall policies become very incomprehensible, which makes inspecting of firewall policy's properties a difficult and error-prone task. In this paper, we propose a tool called PolicyVis which visualizes firewall rules and policies in such a way that efficiently enhances the understanding and inspecting firewall policies. Unlike previous works that attempt to validate or inspect firewall rules based on specific queries or errors, our approach is to visualize firewall policies to enable the user to place general inquiry such as ''does my policy do what I intend to do'' unrestrictedly. We describe the design principals in PolicyVis and provide concepts and examples dealing with firewall policy's properties, rule anomalies and distributed firewalls. As a result, PolicyVis considerably simplifies the management of firewall policies and hence effectively improves the network security.