Motivation Applications – sophisticated, intelligent, open and dynamic environments

1. T. Hill Review of:ROWLBAC – Representing Role Based Access Control in OWLT. Finin, A. Joshi L. Kagal, B. Thuraisingham, J. Niu, R. Sandhu, W. Winsborough 10/13/2008 Problem: Using the hierarchy diagram below, describe how OWL (Web Ontology Language) can be used to specify the following RBAC security model access control functions; assign the role of Person and two sub-class roles of Citizen and Visitor, assign to Citizen the permitted actions of Vote, Work, Jury, assign to Visitor a prohibited action of Work. Make Alice an active Citizen and Bob an active Visitor. [note - general descriptive language is acceptable, exact RDF/OWL syntax is not necessary]. • Motivation • Applications – sophisticated, intelligent, open and dynamic environments • Future – Grid computing, intelligent agents, negotiate exchange of information • Security – of future applications, regardless of infrastructure, including the cloud • Bring together two parallel themes • Access Control Models – RBAC96, NIST Standard, RT, Usage Control • Policy Languages – XACML, Ponder, Rei, KAoS

2. ROWLBAC – Semantic Web and OWL • Semantic Web • Berners-Lee vision • Knowledge published so humans and computers can understand and reason • Technology • W3C standards RDF (Resource Description Framework) triple • //..html has a creation-date whose value is August 16, 1999 • Description Logic

3. ROWLBAC – Roles as Classes, Permissions, Activation, Enforcing • Hierarchy of roles • Enforcing RBAC activation rule { ?ACTION a ActivateRole; subject ?SUBJ; object ?ROLE. ?SUBJ a ?ROLE. ?ROLE activeForm ?AROLE. ?AROLE rdfs:subClassOf ActiveRole. } => { ?ACTION a PermittedRoleActivation; subject ?SUBJ; object ?ROLE. ?SUBJ a ?AROLE }. • Associating permissions with roles PermittedVoteAction a rdfs:Class; rdfs:subClassOf rbac:PermittedAction; owl:equivalentClass [ a owl:Class; owl:intersectionOf ( Vote [ a owl:Restriction; owl:allValuesFrom ex:ActiveCitizen; owl:onProperty rbac:subject ] ) ] • Assigning roles and activation in a session

4. Person Citizen Permitted: Vote, Work, Jury Visitor Prohibited: Work Bob active Alice active ROWLBAC – A Proposed Solution Problem: Using the hierarchy diagram below, describe how OWL (Web Ontology Language) can be used to specify the following RBAC security model access control functions; assign the role of Person and two sub-class roles of Citizen and Visitor, assign to Citizen the permitted actions of Vote, Work, Jury, assign to Visitor a prohibited action of Work. Make Alice an active Citizen and Bob an active Visitor. [note - general descriptive language is acceptable, exact RDF/OWL syntax is not necessary]. Proposed solution: 1. Use RDF/OWL to define Citizen as a subclass of Person and Visitor as a subclass of Person 2. Use RDF/OWL to define Vote as a permitted action of Citizen and Work as a permitted action of Citizen and Jury as a permitted action of Citizen And Work as a prohibited action of Visitor 3. At run time, set Alice as an active Citizen and Bob as an active Visitor