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ROLE HIERARCHIES AND CONSTRAINTS FOR LATTICE-BASED ACCESS CONTROLS

ROLE HIERARCHIES AND CONSTRAINTS FOR LATTICE-BASED ACCESS CONTROLS. Ravi Sandhu George Mason University and SETA Corporation. OUTLINE. RBAC96 model: policy neutral LBAC models: policy full and varied LBAC can be reduced to RBAC96 LBAC < RBAC96 ? why bother to do this?. RBAC96.

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ROLE HIERARCHIES AND CONSTRAINTS FOR LATTICE-BASED ACCESS CONTROLS

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  1. ROLE HIERARCHIES AND CONSTRAINTS FOR LATTICE-BASED ACCESS CONTROLS Ravi Sandhu George Mason University and SETA Corporation

  2. OUTLINE • RBAC96 model: policy neutral • LBAC models: policy full and varied • LBAC can be reduced to RBAC96 • LBAC < RBAC96 ? • why bother to do this?

  3. ... RBAC96 ROLE HIERARCHIES USER-ROLE ASSIGNMENT PERMISSION-ROLE ASSIGNMENT USERS ROLES PERMISSIONS SESSIONS

  4. Supervising Engineer Hardware Engineer Software Engineer Engineer HIERARCHICAL ROLES

  5. ... RBAC96 ROLE HIERARCHIES USER-ROLE ASSIGNMENT PERMISSIONS-ROLE ASSIGNMENT USERS ROLES PERMISSIONS SESSIONS CONSTRAINTS

  6. WHAT IS THE POLICY IN RBAC? • RBAC is policy neutral • Role hierarchies facilitate security management • Constraints facilitate non-discretionary policies

  7. + - H M1 M2 - + L LBAC: LIBERAL *-PROPERTY Read Write

  8. HR LW M1R M2R LR HW RBAC96: LIBERAL *-PROPERTY + M1W M2W - Read Write

  9. RBAC96: LIBERAL *-PROPERTY • user  xR, user has clearance x user  LW, independent of clearance • Need constraints • session  xR iff session  xW • read can be assigned only to xR roles • write can be assigned only to xW roles • (O,read) assigned to xR iff (O,write) assigned to xW

  10. H M1 M2 L LBAC: STRICT *-PROPERTY + - Read Write

  11. HR M1R M2R LR RBAC96: STRICT *-PROPERTY M1W LW HW M2W

  12. H M1 M2 L LBAC: WRITE RANGE • subjects have 2 labels • read label • write label

  13. HR LW M1R M2R LR HW RBAC96: WRITE RANGE LIBERAL *-PROPERTY M1W M2W read role ° write role

  14. HR M1R M2R LR RBAC96: WRITE RANGE STRICT *-PROPERTY M1W LW HW M2W read role ° write role

  15. HS-LI HS LI HS-HI LS-LI LS HI LS-HI LBAC: CONFIDENTIALITY AND INTEGRITY two independent lattices one composite lattice

  16. RBAC96: CONFIDENTIALITY AND INTEGRITY READ ROLES HSR-LIR HSR-HIR LSR-LIR LSR-HIR Same for all cases

  17. RBAC96: CONFIDENTIALITY AND INTEGRITY WRITE ROLES LSW-HIW HSW-HIW LSW-LIW HSW-LIW Liberal confidentiality Liberal integrity

  18. LSW-HIW HSW-HIW LSW-LIW HSW-LIW RBAC96: CONFIDENTIALITY AND INTEGRITY WRITE ROLES Strict confidentiality Liberal integrity

  19. RBAC96: CONFIDENTIALITY AND INTEGRITY WRITE ROLES LSW-HIW HSW-HIW LSW-LIW HSW-LIW Strict confidentiality Strict integrity

  20. SUMMARY • policy-neutral RBAC96 can accommodate policy-full LBAC in all its variations • LBAC variations are modeled by • adjusting role hierarchy • adjusting constraints

  21. COVERT CHANNELS • are a problem for LBAC • remain a problem for RBAC but • they don’t get any worse • same techniques can be adapted • who cares about them anyway

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