rbac-capability project design session ii zutao zhu derived from karthick jayaraman
DESCRIPTION
NOTICESTRANSCRIPT
RBAC-Capability ProjectRBAC-Capability ProjectDesign Session II
Zutao Zhu
Derived from Karthick Jayaraman
AgendaAgendaAnnouncementsDesign questions
◦Delegation◦Separation of duty◦Setuid
Task list for project
NOTICESNOTICES
NoticesNoticesDesign 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 QUESTIONSDESIGN QUESTIONS
DelegationDelegationCAP_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 - continuedDelegation - continuedQuestions:
◦Where to store delegated roles?◦How to enforce SSD and DSD for a
delegation?◦How to do revocation?
Separation of DutySeparation of DutyStatic 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 MechanismSetuid MechanismSetuid programsTraditional 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 - Setuid Mechanism - ContinuedContinuedWhat 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 PROJECTSTAGES IN PROJECT
StagesStages 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 - continuedStages - 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 milestoneNext milestoneSetup 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 youThank you