End-to-End Policy Monitoring and Enforcement for Service-Oriented Architecture

A service-oriented architecture (SOA)-based application is composed of a number of distributed and loosely-coupled services which are interconnected to accomplish a more complex functionality. The main security challenge in SOA is that we cannot trust the participating services in a service composition to behave as expected all the time. Moreover, the chain of all services involved in an end-to-end invocation may not be visible to the clients. As a result, any violation of the client's policies could remain undetected. To address these challenges in SOA, we propose the following contributions. First, we propose a new end-to-end security architecture for SOA based on a dynamic composite trust model. To maintain the dynamic trust, we designed a trusted-third party service called trust manager component, which collects and processes feedbacks from the actual execution of services. Second, we developed an end-to-end inter-service policy monitoring and enforcement framework (PME framework), which is able to dynamically intercept the interactions between services at runtime and react to the potentially malicious activities according to the client's policies. Third, we design an intra-service policy monitoring and enforcement framework based on taint analysis mechanism to monitor the flow of information within services and detect and prevent information disclosure attacks. These two frameworks together can provide an end-to-end visibility and security in SOA. Finally, we have extensively studied the correctness and performance of the proposed security frameworks based on a realistic SOA case study in a cloud environment. All experimental studies validate that the practicality and effectiveness of the presented solutions.