Brew SDN Security Framework for Cross-Layer Flow Rule Conflict Resolution
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Solution Overview
Problem
In distributed SDN-based cloud environments, existing security frameworks fail to effectively address cross-layer policy conflicts and administrator-assisted conflict resolution, leading to inefficiencies and security vulnerabilities due to the abstraction of data and control planes, which results in potential bottlenecks and inconsistencies in flow rule management.
Innovation Solution
A security policy analysis framework, named Brew, is introduced that classifies and detects cross-layer conflicts using a novel classification type, automatically resolves intelligible conflicts, and provides mechanisms for interpretive conflict resolution through a system comprising a flow extraction engine, conflict detection engine, and conflict resolution engine, with visualization tools for administrators.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If flow rules are dynamically added by applications through API in SDN-based cloud environment, then security policy flexibility and programmability are improved, but flow rule conflicts between different tenants and controllers increase
Solution Approach 1:
The patent performs conflict detection and resolution before flow rules are installed on SDN switches. The controller intercepts flow rule installation requests, analyzes them for conflicts with existing rules, and resolves conflicts preemptively. This preliminary action prevents conflicting rules from being deployed, maintaining reliability while allowing flexible dynamic rule addition through API.
Solution Approach 2:
The patent implements a feedback mechanism where the controller continuously monitors the flow rule base, detects conflicts between rules from different tenants or controllers, and triggers conflict resolution processes. This feedback loop ensures that security policy flexibility is maintained while conflicts are automatically detected and resolved to preserve rule consistency.
2Ease of operation
If centralized controller is used in SDN architecture, then flow rule management and security policy enforcement are simplified, but scalability and performance bottlenecks deteriorate
Solution Approach 1:
The patent segments the centralized controller into multiple controller instances that can operate independently. Each controller instance manages a portion of the flow rules and can process requests in parallel. This segmentation maintains ease of flow rule management through standardized interfaces while improving scalability and eliminating single-point bottlenecks.
Solution Approach 2:
The patent creates a universal conflict detection and resolution mechanism that can be deployed across multiple controller instances. This multi-functional approach allows each controller to independently detect and resolve conflicts in its managed flow rules, distributing the management workload while maintaining consistent security policies across the entire SDN environment.
3Productivity
If multiple distributed controllers are deployed in SDN-based cloud environment, then scalability and performance are improved, but flow rule conflicts between controllers increase
Solution Approach 1:
The patent introduces an intermediary coordination mechanism between distributed controllers. When flow rules are added or modified, controllers communicate through standardized interfaces to detect potential conflicts before deployment. This intermediary layer ensures that scalability is maintained through distributed architecture while flow rule synchronization and consistency are preserved across all controllers.
Data Source
AI summary
Embodiments are disclosed that relate generally to software defined networking (SDN), and more particularly, but not by way of limitation, to devices, systems, and methods for a security policy analysis framework for distributed SDN-based cloud computing environments. The ease of programmability in SDN makes it a great platform implementation of various initiatives that involve application deployment, dynamic topology changes, and decentralized network management in a multi-tenant data center environment. However, implementing security solutions in such an environment is fraught with policy conflicts and consistency issues with the hardness of this problem being affected by the distribution scheme for the SDN controllers. In the embodiments disclosed herein, a security policy analysis framework is implemented on an OpenDaylight SDN controller that has comprehensive conflict detection and resolution modules to ensure that no two flow rules in a distributed SDN-based cloud environment have conflicts at any layer. This assures consistent conflict-free security policy implementation and preventing information leakage. In the embodiments disclosed herein, techniques are described for global prioritization of flow rules in a decentralized environment, for extending firewall rule conflict classification from a traditional environment to SDN flow rule conflicts by recognizing and classifying conflicts stemming from cross-layer conflicts, and providing strategies for unassisted resolution of these conflicts. Alternately, if administrator input is desired to resolve conflicts, a visualization scheme is implemented to help the administrators view the conflicts graphically.