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Role-Based Administration of User-Role Assignment: The URA97 Model and its Oracle Implementation

Role-Based Administration of User-Role Assignment: The URA97 Model and its Oracle Implementation. Ravi Sandhu Venkata Bhamidipati Laboratory for Information Security Technology (LIST) George Mason University. OUTLINE. RBAC96 review URA97 model URA97 Oracle implementation Closing remarks.

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Role-Based Administration of User-Role Assignment: The URA97 Model and its Oracle Implementation

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  1. Role-Based Administration of User-Role Assignment:The URA97 Model and its Oracle Implementation Ravi Sandhu Venkata Bhamidipati Laboratory for Information Security Technology (LIST) George Mason University

  2. OUTLINE • RBAC96 review • URA97 model • URA97 Oracle implementation • Closing remarks

  3. ... RBAC96 ROLES PERMISSIONS USERS CONSTRAINTS SESSIONS ADMIN ROLES ADMIN PERMISSIONS

  4. ... RBAC96: RBAC0 ROLES PERMISSIONS USERS SESSIONS

  5. ... RBAC96: RBAC1 ROLES PERMISSIONS USERS SESSIONS

  6. ... RBAC96 : RBAC2 ROLES PERMISSIONS USERS CONSTRAINTS SESSIONS

  7. ... RBAC96 : RBAC3 ROLES PERMISSIONS USERS CONSTRAINTS SESSIONS

  8. ... RBAC96 ROLES PERMISSIONS USERS CONSTRAINTS SESSIONS ADMIN ROLES ADMIN PERMISSIONS

  9. RBAC3 ARBAC3 RBAC1 RBAC2 ARBAC1 ARBAC2 RBAC0 ARBAC0 RBAC96

  10. SCALE AND RATE OF CHANGE • roles: 100s or 1000s • users: 1000s or 10,000s or more • Frequent changes to • user-role assignment • permission-role assignment • Less frequent changes for • role hierarchy

  11. ADMINISTRATIVE RBAC • user-role assignment • permission-role assignment • role-role hierarchy

  12. EXAMPLE ROLE HIERARCHY Director (DIR) Project Lead 1 (PL1) Project Lead 2 (PL2) Production 1 (P1) Quality 1 (Q1) Production 2 (P2) Quality 2 (Q2) Engineer 1 (E1) Engineer 2 (E2) Engineering Department (ED) PROJECT 1 PROJECT 2 Employee (E)

  13. EXAMPLE ADMINISTRATIVE ROLE HIERARCHY Senior Security Officer (SSO) Department Security Officer (DSO) Project Security Officer 1 (PSO1) Project Security Officer 2 (PSO2)

  14. URA97 GRANT MODEL:can-assign ARole Prereq Role Role Range PSO1 ED [E1,PL1) PSO2 ED [E2,PL2) DSO ED (ED,DIR) SSO E [ED,ED] SSO ED (ED,DIR]

  15. URA97 GRANT MODEL :can-assign ARole Prereq Cond Role Range PSO1 ED [E1,E1] PSO1 ED & ¬ P1 [Q1,Q1] PSO1 ED & ¬ Q1 [P1,P1] PSO2 ED [E2,E2] PSO2 ED & ¬ P2 [Q2,Q2] PSO2 ED & ¬ Q2 [P2,P2]

  16. URA97 GRANT MODEL • “redundant” assignments to senior and junior roles • are allowed • are useful

  17. URA97 REVOKE MODEL • WEAK REVOCATION • revokes explicit membership in a role • independent of who did the assignment

  18. URA97 REVOKE MODEL • STRONG REVOCATION • revokes explicit membership in a role and its seniors • authorized only if corresponding weak revokes are authorized • alternatives • all-or-nothing • revoke within range

  19. URA97 REVOKE MODEL :can-revoke ARole Role Range PSO1 [E1,PL1) PSO2 [E2,PL2) DSO (ED,DIR) SSO [ED,DIR]

  20. ORACLE ROLES • support RBAC1 • administrative model has strong discretionary flavor • administrative authority on role implies • can grant role to any user or role • can grant role to any role • anyone with grant option on a permission can grant it to any role

  21. URA97 IN ORACLE • administrative option for all roles is retained solely with DBA • never given to any user • use generic stored procedures with URA97 can-assign and can-revoke implemented as relations

  22. URA97 IN ORACLE • Oracle primitives for traversing role hierarchy need to be extended

  23. can-assign in dnfER DIAGRAM CAN_ASSIGN CAN_ASSIGN2 Admin Role PreCondition Min_Int Min Role Max Role Max_Int PreCondition AND set name NOT set name CAN_ASSIGN4 CAN_ASSIGN3 AND set name AND roles NOT set name NOT roles

  24. can-revokeRELATION CAN_REVOKE Admin Role Min_Int Min Role Max Role Max_Int

  25. ORACLE STORED PROCEDURES • can extend Oracle access control model • limitation • stored procedure can determine who the user is BUT • cannot determine active roles of the user

  26. URA97 STORED PROCEDURES • ASSIGN(user, trole, arole) • WEAK_REVOKE(user, trole, arole) • STRONG_REVOKE(user, trole, arole) • user: user being added to trole • trole: target role • arole: administrative role used for this operation • due to Oracle limitations

  27. CLOSING REMARKS:PREVIEW OF WORK IN PROGRESS • user-role assignment • URA97 and Oracle, this paper • other platforms • permission-role assignment • PRA97, dual of URA97 • Oracle implementation

  28. CLOSING REMARKS:PREVIEW OF WORK IN PROGRESS • role-role hierarchy • user-only roles (groups): like URA97 • permission-only roles: like PRA97 • user and permission roles: RRA97

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