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RBAC-Capability Project

RBAC-Capability Project. Design Session I Zutao Zhu 10/23/2009 Derived from Karthick Jayaraman ’s ppt. Agenda. Self - status check Summary of requirements Design questions Privileged user operations Representing role and capabilities Session representation Delegation

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RBAC-Capability Project

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  1. RBAC-Capability Project Design Session I Zutao Zhu 10/23/2009 Derived from Karthick Jayaraman’s ppt

  2. Agenda • Self - status check • Summary of requirements • Design questions • Privileged user operations • Representing role and capabilities • Session representation • Delegation • Separation of duty • Setuid

  3. SELF Status check

  4. Self Status Check • Expectations • Understood requirements • Comfortable with making changes to Minix3 • Compiling the kernel • Adding a new system call • Familiar with important portions of the source code. • Exceeding expectations • Finished preliminary design and started coding.

  5. SUMMARY of REquirements

  6. Requirements • RBAC-Capability should co-exist ACL. • UA : User – role mapping • PA : Role – capability mapping • A privileged user controls (UA) and (PA) assignment.. • A login session is a RBAC session. All processes in an login session belong to the same RBAC session.

  7. Requirements - continued • The CAP_ROLE_DELEGATE role should entitle a user to delegate his/her roles to others temporarily, and also revoke them at a later time. • Enable, disable, and drop roles. • Separation of duty: • SSD and DSD rules. • Supporting SETUID • Traditional setuid programs should work • Should also support an equivalent of setuid in the RBAC capability model.

  8. Design questions

  9. Privileged User Operations • Who is the Privileged user ? • How to maintain UA and PA assignment? • Where to store ? • Who will update ? • Privileged user operations • Role_Adduser, Role_Removeuser, Role_Addpermission, Role_Removepermission, Add_Role_to_Program.

  10. Representing Roles and Capabilities • Observe file-descriptor management • How to represent a role ? • What information should each role contain ? • How to represent a capability ? • What information should each capability contain ? • Should a process reference role / capability ? • Information depends on role-operations • ActivateRole, DeactivateRole, DropRole, DelegateRole, RevokeRole

  11. Session Representation • RBAC Session : Each login session. • A subset of user-roles is active for each session. • A user may have multiple sessions. • Each session may have different roles active. • All processes in a login session should have the same set of roles. • How to represent a session ? • What does the process carry ?

  12. Delegation • CAP_ROLE_DELEGATE • Delegated roles are available to users immediately. • User should explicitly activate delegated roles. • The delegated roles should be available to all user-sessions.

  13. Separation of Duty • Static Separation of Duty (SSD) • Dynamic separation of Duty (DSD) • When to check each? • How to represent the rules? • Who can update the rules?

  14. Setuid Mechanism • Setuid programs • Traditional setuid programs should work. • How could a RBAC-aware support a setuid equivalent mechanism ? • What is the meaning of these system calls in the RBAC model: • Setuid() • Seteuid()

  15. Next milestone • Setup all kernel data-structures required for supporting RBAC-capability. • Implement all role operations. • Should have a facility to printout all role / capabilities for the process. • Should be able to show the correctness of all role operations.

  16. Thank you

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