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Institute for Cyber Security

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Presentation on theme: "Institute for Cyber Security"— Presentation transcript:

1 Institute for Cyber Security
Attribute-Based Access Control: Insights and Challenges Prof. Ravi Sandhu Executive Director and Endowed Professor of Computer Science Final event of the research priority program on Reliably Secure Software Systems (RS3) Darmstadt, Germany September 5, 2017 © Ravi Sandhu World-Leading Research with Real-World Impact!

2 Cyber Security Landscape
Objectives POLICY ATTACKS What? Why? Enforce Enable Defend Respond PROTECT DETECT Complement How? Mechanisms © Ravi Sandhu World-Leading Research with Real-World Impact! 2

3 Cyber Security Landscape
Objectives POLICY ATTACKS What? Why? Enforce Enable Defend Respond Access Control PROTECT DETECT Complement How? Mechanisms © Ravi Sandhu World-Leading Research with Real-World Impact! 3

4 Access Control Evolution
Fixed policy Discretionary Access Control (DAC), 1970 Mandatory Access Control (MAC), 1970 Role Based Access Control (RBAC), 1995 Attribute Based Access Control (ABAC), ???? Flexible policy Born 1990s © Ravi Sandhu World-Leading Research with Real-World Impact! 4

5 Access Control Evolution
Discretionary Access Control (DAC), 1970 Mandatory Access Control (MAC), 1970 Relationship Based Access Control (ReBAC) ???? Role Based Access Control (RBAC), 1995 Provenance Based Access Control (PBAC) ???? Born mid 2000s Born late 2000s Attribute Based Access Control (ABAC), ???? Born 1990s © Ravi Sandhu World-Leading Research with Real-World Impact! 5

6 The ABAC Challenge ABAC is orders of magnitude more complex than anything that has been an Access Control winner so far (DAC, MAC, RBAC) We need the complexity, but need to manage it If Google can index the web, we can do ABAC!! Cloud-enabled IoT may be the killer app After ABAC what? © Ravi Sandhu World-Leading Research with Real-World Impact! 6

7 ABAC Research Agenda 7. ABAC Design, Engineering and Applications
3. Administrative ABAC Models 4. Extended ABAC Models 5. ABAC Policy Architectures and Languages 6. ABAC Enforcement Architectures 2. Core ABAC Models 1. Foundational Principles and Theory Based on RBAC experience © Ravi Sandhu World-Leading Research with Real-World Impact! 7

8 ABAC Research Agenda 2. Core ABAC Models
7. ABAC Design, Engineering and Applications 3. Administrative ABAC Models 4. Extended ABAC Models 5. ABAC Policy Architectures and Languages 6. ABAC Enforcement Architectures 2. Core ABAC Models 1. Foundational Principles and Theory © Ravi Sandhu World-Leading Research with Real-World Impact! 8

9 Can be configured to do simple forms of DAC, MAC, RBAC
2. Core ABAC Models: ABACα Policy Configuration Points Can be configured to do simple forms of DAC, MAC, RBAC Jin, Krishnan, Sandhu 2012 © Ravi Sandhu World-Leading Research with Real-World Impact! 9

10 Can further be configured to do many
2. Core ABAC Models: ABACβ Can further be configured to do many RBAC extensions Jin, Krishnan, Sandhu 2014 © Ravi Sandhu World-Leading Research with Real-World Impact! 10

11 2. Core ABAC Models: HGABAC
U: User UG: User-Group S: Subject UA: User Attributes O: Object OG: Object-Group OA: Object Attributes OP: Operations Hierarchical Group and Attribute Based Access Control (HGABAC) Introduces the notion of User and Object Groups Core advantage is simplified administration of attributes User and Objects are assigned set of attributes in one go as compared to single assignment at a time. Servos and Osborn, 2015 © Ravi Sandhu World-Leading Research with Real-World Impact!

12 ABAC Research Agenda 7. ABAC Design, Engineering and Applications
3. Administrative ABAC Models 4. Extended ABAC Models 5. ABAC Policy Architectures and Languages 6. ABAC Enforcement Architectures 2. Core ABAC Models 1. Foundational Principles and Theory © Ravi Sandhu World-Leading Research with Real-World Impact! 12

13 3. Administrative ABAC Models: GURA and GURAG
Jin, Krishnan, Sandhu, 2012 Gupta, Sandhu, 2016 © Ravi Sandhu World-Leading Research with Real-World Impact! 13

14 ABAC Research Agenda 7. ABAC Design, Engineering and Applications
3. Administrative ABAC Models 4. Extended ABAC Models 5. ABAC Policy Architectures and Languages 6. ABAC Enforcement Architectures 2. Core ABAC Models 1. Foundational Principles and Theory © Ravi Sandhu World-Leading Research with Real-World Impact! 14

15 4. Extended ABAC Models: UCON
unified model integrating authorization obligation conditions and incorporating continuity of decisions mutability of attributes Usage Control Models, early 2000s Park, Sandhu, Pretschner © Ravi Sandhu World-Leading Research with Real-World Impact! 15

16 4. Extended ABAC Models: ReBAC versus ABAC
Equivalence of ReBAC and ABAC Structural Variants © Ravi Sandhu World-Leading Research with Real-World Impact! 16

17 4. Extended ABAC Models: ReBAC versus ABAC
Non-Equivalence of ReBAC and ABAC Variants © Ravi Sandhu World-Leading Research with Real-World Impact! 17

18 1. Foundational Principles and Theory
ABAC Research Agenda 7. ABAC Design, Engineering and Applications 3. Administrative ABAC Models 4. Extended ABAC Models 5. ABAC Policy Architectures and Languages 6. ABAC Enforcement Architectures 2. Core ABAC Models 1. Foundational Principles and Theory © Ravi Sandhu World-Leading Research with Real-World Impact! 18

19 1. Foundations: Safety Discretionary Access Control (DAC), 1970
Mandatory Access Control (MAC), 1970 Role Based Access Control (RBAC), 1995 Attribute Based Access Control (ABAC), ???? Can subject s obtain a right r on object o? Current state? Some future state? Safety Complexity © Ravi Sandhu World-Leading Research with Real-World Impact! 19

20 1. Foundations: Safety A single infinite attribute with no creation leads to undecidable safety. Rajkumar 2012 Pre_UCON with finite attributes and unbounded creation has decidable safety. Rajkumar, Sandhu 2016 ABACα has decidable safety. Ahmed, Sandhu 2017 GURA has decidable safety/reachability. Jin, Krishnan, Sandhu 2017 © Ravi Sandhu World-Leading Research with Real-World Impact! 20

21 Architectures and Languages
ABAC Research Agenda 7. ABAC Design, Engineering and Applications 3. Administrative ABAC Models 4. Extended ABAC Models 5. ABAC Policy Architectures and Languages 6. ABAC Enforcement Architectures 2. Core ABAC Models 1. Foundational Principles and Theory © Ravi Sandhu World-Leading Research with Real-World Impact! 21

22 5. Policy Architecture: Centralized ABACα style
Policy Configuration Points © Ravi Sandhu World-Leading Research with Real-World Impact! 22

23 5. Policy Architecture: Diffused AWS style
© Ravi Sandhu World-Leading Research with Real-World Impact! 23

24 6. ABAC Enforcement Architectures
ABAC Research Agenda 7. ABAC Design, Engineering and Applications 3. Administrative ABAC Models 4. Extended ABAC Models 5. ABAC Policy Architectures and Languages 6. ABAC Enforcement Architectures 2. Core ABAC Models 1. Foundational Principles and Theory © Ravi Sandhu World-Leading Research with Real-World Impact! 24

25 6. ABAC Enforcement Architecture: Federated ABAC
Fisher 2015 NCCOE, NIST, Building Block © Ravi Sandhu World-Leading Research with Real-World Impact! 25

26 7. ABAC Design, Engineering and Applications
ABAC Research Agenda 7. ABAC Design, Engineering and Applications 3. Administrative ABAC Models 4. Extended ABAC Models 5. ABAC Policy Architectures and Languages 6. ABAC Enforcement Architectures 2. Core ABAC Models 1. Foundational Principles and Theory © Ravi Sandhu World-Leading Research with Real-World Impact! 26

27 7. ABAC Applications: Cloud IaaS
Cloud Computing IaaS Single tenant Multi tenant Multi cloud Jin, Tang, Dang, Bijon, Pustchi, Zhang, Biswas, Ahmed, Cheng, Patwa, Krishnan, Sandhu 2012 onwards © Ravi Sandhu World-Leading Research with Real-World Impact! 27

28 7. ABAC Applications: Cloud Enabled IoT
Alsheri, Bhatt, Patwa, Benson, Sandhu 2016 onwards © Ravi Sandhu World-Leading Research with Real-World Impact! 28

29 ABAC Research Agenda 7. ABAC Design, Engineering and Applications
3. Administrative ABAC Models 4. Extended ABAC Models 5. ABAC Policy Architectures and Languages 6. ABAC Enforcement Architectures 2. Core ABAC Models 1. Foundational Principles and Theory © Ravi Sandhu World-Leading Research with Real-World Impact! 29

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