Role usage and activation hierarchies best viewed in slide show mode
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Role Usage and Activation Hierarchies (best viewed in slide show mode). Ravi Sandhu Laboratory for Information Security Technology George Mason University www.list.gmu.edu sandhu@gmu.edu. Reference.

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Role Usage and Activation Hierarchies (best viewed in slide show mode)

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Role Usage and Activation Hierarchies(best viewed in slide show mode)

Ravi Sandhu

Laboratory for Information Security Technology

George Mason University

www.list.gmu.edu

sandhu@gmu.edu


Reference

  • Ravi Sandhu, “Role Hierarchies and Constraints for Lattice-Based Access Controls.” Proc. Fourth European Symposium on Research in Computer Security, Rome, Italy, September 25-27, 1996, pages 65-79. Published as Lecture Notes in Computer Science, Computer Security-ESORICS96 (Elisa Bertino et al, editors), Springer-Verlag, 1996.

  • Ravi Sandhu, “Role Activation Hierarchies.” Proc. Third ACM Workshop on Role-Based Access Control, Fairfax, Virginia, October 22-23, 1998, pages 33-40.

  • Sylvia Osborn, Ravi Sandhu and Qamar Munawer. “Configuring Role-Based Access Control to Enforce Mandatory and Discretionary Access Control Policies.” ACM Transactions on Information and System Security, Volume 3, Number 2, May 2000, pages 85-106.


Role hierarchies

  • Two aspects

    • Role usage: permission inheritance

    • Role activation: activation hierarchy

  • RBAC96 combines both aspects in a single hierarchy

  • ANSI/NIST standard model leaves this open

    • Do one or both, just make it clear what you are doing


Example Role Hierarchy


LBAC to RBAC


Simple security property

  • some variations of LBAC use 2 labels for subjects

    • λr for read and λw for read

    • λr = λw for the single label case


Variations of *-property


LBAC to RBAC: independent read-write hierarchies


LBAC to RBAC: intertwined read-write hierarchies


Activation hierarchies and dynamic SOD


Formal definition


Activation hierarchy with non-maximal roles


Read-write RBAC and LBAC


LBAC with trusted strict *-property


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