Checking risky events is enough for local policies

  • Authors:
  • Massimo Bartoletti;Pierpaolo Degano;Gian Luigi Ferrari

  • Affiliations:
  • Dipartimento di Informatica, Università di Pisa, Italy;Dipartimento di Informatica, Università di Pisa, Italy;Dipartimento di Informatica, Università di Pisa, Italy

  • Venue:
  • ICTCS'05 Proceedings of the 9th Italian conference on Theoretical Computer Science
  • Year:
  • 2005

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Abstract

An extension of the λ-calculus is proposed to study history-based access control. It allows for parametrized security policies with a possibly nested, local scope. To govern the rich interplay between local policies, we propose a combination of static analysis and dynamic checking. A type and effect system extracts from programs a correct approximation to the histories obtainable at run-time. A further static analysis over these approximations determines how to instrument code so to enforce the desired security constraints. The execution monitor, based on finite-state automata, runs efficiently the instrumented code.