%0 Journal Article
%@ 2075-2180
%A Ghilezan, Silvia
%A Jakšić, Svetlana
%A Pantović, Jovanka
%A Pérez, Jorge A.
%A Torres Vieira, Hugo
%D 2015
%F eprints:3690
%I Open Publishing Association
%J Electronic Proceedings in Theoretical Computer Science
%P 73-84
%T A Typed Model for Dynamic Authorizations
%U http://eprints.imtlucca.it/3690/
%V 203
%X Security requirements in distributed software systems are inherently dynamic. In the case of authorization policies, resources are meant to be accessed only by authorized parties, but the authorization to access a resource may be dynamically granted/yielded. We describe ongoing work on a model for specifying communication and dynamic authorization handling. We build upon the pi-calculus so as to enrich communication-based systems with authorization specification and delegation; here authorizations regard channel usage and delegation refers to the act of yielding an authorization to another party. Our model includes: (i) a novel scoping construct for authorization, which allows to specify authorization boundaries, and (ii) communication primitives for authorizations, which allow to pass around authorizations to act on a given channel. An authorization error may consist in, e.g., performing an action along a name which is not under an appropriate authorization scope. We introduce a typing discipline that ensures that processes never reduce to authorization errors, even when authorizations are dynamically delegated.
%Z Proceedings Eighth International Workshop on Programming Language Approaches to Concurrency- and Communication-cEntric Software, PLACES 2015, London, UK, 18th April 2015.