1. Authorizing Slice Creation How ABAC Coordinates Distributed Authorization Alefiya Hussain alefiya.hussain@sparta.com 1

2. TIED Joins GENI How does TIED get to know GENI users? Keeping local ABAC policy same (there are many other ways too) – Sharing known attributes – Discovery of partner policy changes – Coordinating with new partners 2

3. The Players TIED the resource owner provides equipment and establishes high-level policies for utilization 3 Alex the researcher received a GENI award and want to use the substrate for experiments

4. The Players TIED the resource owner provides equipment and establishes high-level policies for utilization 4 Alex the researcher received a GENI award and want to use the substrate for experiments GENI the coordinator/certifier asserts attributes for these new principals

5. The Players: GENI, TIED, Alex The GENI defines various attributes to manage groups of people Defines groups such as researchers, gradStudents, vendors…. And publishes facts about them Alex is a GENI researcher 5

6. The Players: GENI, TIED, Alex TIED learns about GENI’s facts and incorporates them into its local authorization policy So TIED publishes a fact All GENI researchers can create slices on TIED Thus it delegates some resource control to GENI 6

7. The Players: GENI, TIED, Alex Alex learns he needs to identify himself as a researcher to create a slice 7

8. ABAC Enables the Players TIED Slice Manager ABAC Alex: I want to create a slice? GENI.researcher  Alex TIED Local Policy: If you are a GENI researcher, you can create a slice. TIED.createSlice  GENI.researcher GENI GENI Welcome Package: A researcher credential is sent to Alex 8

9. ABAC Negotiation Grants Access TIED Slice Manager ABAC GENI.researcher  Alex TIED.createSlice  GENI.researcher 1.Sends request with cred+key. 2. ABAC constructs proof. Proof: TIED.createSlice  GENI.researcher  Alex Grants Access 9

10. Summary: Alex creates a slice GENI added Alex to the researcher attribute space TIED uses GENI’s credential (GENI.researcher) to authorize users to create slices 10

11. The GENI expands it’s attribute space Keeping local ABAC policy same – Sharing known attributes – Discovery of partner policy changes – Coordinating with new partners 11

12. The Players: GENI, TIED, Bob GENI decides gradStudents are also a kind of researcher So, GENI publishes a new fact All gradstudents are also researchers 12

13. The Players: GENI, TIED, Bob Policy at TIED does not change TIED.createSlice  GENI.researcher TIED is unaware of the change 13

14. The Players: GENI, TIED, Bob Bob identifies himself as a gradStudent to TIED 14

15. ABAC Enables the Players TIED Slice Manager ABAC 1.I want to create a slice? TIED.createSlice  GENI.researcher GENI Registry GENI.gradStudent  Bob GENI.researcher  GENI.gradStudent. 15

16. TIED discovers credentials TIED Slice Manager ABAC 1.I want to create a slice? TIED.createSlice  GENI.researcher GENI Registry 2. ABAC proof construction fails Proof: TIED.createSlice  GENI.researcher  ? GENI.gradStudent  Bob Need more information from GENI 16

17. TIED discovers credentials TIED Slice Manager ABAC 1.I want to create a slice? TIED.createSlice  GENI.resercher GENI Registry 2. ABAC proof construction fails 3. Is Bob a researcher? 4. I don’t know, but here are some relevant credentials GENI.researcher  GENI.gradStudent 5. ABAC constructs proof. Proof: TIED.createSlice  GENI.resercher GENI.researcher  GENI.gradStudent  Bob Grants Access 17

18. Summary: Bob creates the slice! No policy impact on the resource provider TIED, the resource provider, learned relevant information from the external certifiers 18

19. GENI Coordinates with the NSF 19 Keeping local ABAC policy same – Sharing know attributes – Discovery of partner policy changes, – Coordinating with new partners

20. Chloe wants to create a slice Chloe is a NSF NeTS FIND researcher 20

21. The Players: NSF, GENI, TIED, Chloe NSF makes each program initiative a principal – FIND, CISE NSF assigns each initiative a program attribute NSF.program  FIND Each initiative defines its own attribute space; specifically researcher attributes FIND.researcher  Chloe 21

22. The Players: NSF, GENI, TIED, Chloe GENI and NSF negotiate and decide to treat all NSF program researchers as GENI researchers GENI publishes a new fact All NSF program researchers are also GENI researchers This is expressed as a linked credential GENI.researcher  NSF.program.researcher 22

23. The Players: NSF, GENI, TIED, Chloe TIED has no policy changes Chloe identifies herself as a FIND researcher to TIED 23

24. ABAC Enables the Access TIED Slice Manager ABAC FIND.researcher  Chloe NSF.program  FIND TIED.createSlice  GENI.researcher NSF 1.I want to create a slice? 2. ABAC proof construction fails Proof: TIED.createSlice  GENI.researcher  ? FIND.researcher  Chloe NSF.program  FIND Need more information from GENI 24

25. ABAC Enables the Access TIED Slice Manager ABAC TIED.createSlice  GENI.researcher GENI 1.I want to create a slice? 2. ABAC proof construction fails 3. Do you know the NSF? 4. Yes, here are some relevant credentials GENI.researcher  NSF.program.researcher 5. ABAC constructs proof. Proof: TIED.createSlice  GENI.resercher  NSF.program.researcher; NSF.program  FIND; FIND.researcer  Chloe Grants Access 25

26. Summary ABAC can expresses complex relationships between principals – Through principal delegation – Through attribute-based delegation Local policy at the resource provider need not change Many entities can coordinate complex policy End user is insulated from policy details 26