RBAC-Capability Project Design Session II Zutao Zhu Derived from Karthick Jayaraman

Agenda Announcements Design questions ◦ Delegation ◦ Separation of duty ◦ Setuid Task list for project

NOTICES

Notices Design session I minutes are online. Design document ◦ Due on Monday, Nov 5, 2009 ◦ You may just summarize your plan for each design section. ◦ Please do not make an elaborate document.

DESIGN QUESTIONS

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. Delegation ends when machine reboots or the delegating user revokes the delegation. Revocation: Revoking a delegation chain is a challenge.

Delegation - continued Questions: ◦ Where to store delegated roles? ◦ How to enforce SSD and DSD for a delegation? ◦ How to do revocation?

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? Can the rules keep changing often?

Setuid Mechanism Setuid programs Traditional setuid programs should work. Set-owner-role program: How could a RBAC-aware support a setuid equivalent mechanism? Do we need a different identification mechanism for set-owner-role program ?

Setuid Mechanism - Continued What is the meaning of these system calls in the RBAC model: ◦ Setuid() ◦ Seteuid() Should these system calls be allowed for a set-owner-role program?

STAGES IN PROJECT

Stages Implementing commands to do UA and PA assignment. Defining all kernel level data structures required for supporting RBAC-Capability. ◦ Representing roles and capabiities. ◦ Representing session. ◦ Additional data structure(s) to support delegation. ◦ Changes to fproc structure. Changing login.c to setup a session.

Stages - continued Implementing role operations: Enable / Disable / and Drop session. Implementing delegation. Writing functions and commands to check SSD and DSD rules. Supporting set-owner-role programs. Changes to reference monitor.

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.

Thank you