Konstantin Beznosov

18 October 2006

Abstract: The request-response paradigm used for access control solutions commonly leads to point-to-point (PTP) architectures, with security enforcement logic obtaining decisions from authorization servers through remote procedure calls. In massive-scale and complex enterprises, PTP authorization architectures result in fragile and inefficient solutions. They also fail to exploit virtually free CPU resources and network bandwidth. This talk introduces a three-fold approach to improving availability and performance of authorization solutions: employing publish-subscribe technologies, *actively* recycling authorizations, and flooding PEPs with speculatively precomputed *junk* authorizations. After introducing the approach, the talk describes in detail the active authorization recycling part. Specifically, it defines the secondary and approximate authorization model (SAAM). In SAAM, approximate authorization responses are inferred from cached primary responses, and therefore provide an alternative source of access control decisions in the event that the authorization server is unavailable or slow. The ability to compute approximate authorizations improves the reliability and performance of access control sub-systems and ultimately the application systems themselves. The operation of a system that employs SAAM depends on the type of access control policy it implements. We propose and analyze algorithms for computing secondary authorizations in the case of policies based on the Bell-LaPadula model. In this context, we define a dominance graph, and describe its construction and usage for generating secondary responses to authorization requests. Preliminary results of evaluating SAAM-BLP algorithms demonstrate a 15% increase in the number of authorization requests that can be served without consulting access control policies.

Keyword(s): SAAM ; JAMES ; access control ; Bell-LaPadulla ; BLP ; access control models and languages

Published in: Konstantin Beznosov "The Secondary and Approximate Authorization Model and its Application to BellLaPadula Policies," Marina del Rey, Clifornia, USA, Computer Networks Division, Information Sciences Institute, the University of Southern California, 6 February, 2006, pp.35.: