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Aiming at the privacy preservation of dynamic Web service composition, thispaper proposes a SDN-based runtime security enforcement approach for privacypreservation of dynamic Web service composition. The main idea of this approachis that the owner of service composition leverages the security policy model(SPM) to define the access control relationships that service composition mustcomply with in the application plane, then SPM model is transformed into thelow-level security policy model (RSPM) containing the information of SDN dataplane, and RSPM model is uploaded into the SDN controller. After uploading, thevirtual machine access control algorithm integrated in the SDN controllermonitors all of access requests towards service composition at runtime. Onlythe access requests that meet the definition of RSPM model can be forwarded tothe target terminal. Any access requests that do not meet the definition ofRSPM model will be automatically blocked by Openflow switches or deleted by SDNcontroller, Thus, this approach can effectively solve the problems ofnetwork-layer illegal accesses, identity theft attacks and service leakageswhen Web service composition is running. In order to verify the feasibility ofthis approach, this paper implements an experimental system by using POXcontroller and Mininet virtual network simulator, and evaluates theeffectiveness and performance of this approach by using this system. The finalexperimental results show that the method is completely effective, and themethod can always get the correct calculation results in an acceptable timewhen the scale of RSPM model is gradually increasing.

SDN-based Runtime Security Enforcement Approach for Privacy Preservation of Dynamic Web Service Composition