GridShib: Campus/Grid RBAC Integration Penn State Grid Computing Workshop August 5th, 2005 Von Welch

August 5th, 20052PSU Grid Computing Workshop Outline Overview of Shibboleth and Globus Our Motivation and Use Cases Integration Approach Status

August 5th, 20053PSU Grid Computing Workshop Shibboleth Internet2 project Allows for inter-institutional sharing of web resources (via browsers) –Provides attributes for authorization between institutions Allows for pseudonymity via temporary, meaningless identifiers called ‘Handles’ Standards-based (SAML) Being extended to non-web resources

August 5th, 20054PSU Grid Computing Workshop Acknowledgements NSF NMI project to allow the use of Shibboleth-issued attributes for authorization in NMI Grids built on the Globus Toolkit –Funded under NSF award SCI GridShib team: NCSA, U. Chicago, ANL –Tom Barton, David Champion, Tim Freemon, Kate Keahey, Tom Scavo, Frank Siebenlist, Von Welch Working in collaboration with Steven Carmody, Scott Cantor, Bob Morgan and the rest of the Internet2 Shibboleth Design team

August 5th, 20055PSU Grid Computing Workshop Shibboleth Identity Provider composed of single sign-on (SSO) and attribute authority (AA) services SSO: authenticates user locally and issues authentication assertion with Handle –Assertion is short-lived bearer assertion –Handle is also short-lived and non-identifying –Handle is registered with AA Attribute Authority responds to queries regarding handle

August 5th, 20056PSU Grid Computing Workshop Shibboleth Service Provider composed of Assertion Consumer and Attribute Requestor Assertion Consumer parses authentication assertion Attribute Requestor: request attributes from AA –Attributes used for authorization Where Are You From (WAYF) service determines user’s Identity Provider

August 5th, 20057PSU Grid Computing Workshop Shibboleth (Simplified) AA SSO Shibboleth IdP Handle Attributes SAML AR ACS Shibboleth SP Handle LDAP (e.g.)

August 5th, 20058PSU Grid Computing Workshop Globus Toolkit Toolkit for Grid computing –Job submission, data movement, data management, resource management Based on Web Services and WSRF Security based on X.509 identity- and proxy-certificates –Maybe from conventional or on-line CAs Some initial attribute-based authorization

August 5th, 20059PSU Grid Computing Workshop Motivation Many Grid VOs are focused on science or business other than IT support –Don’t have expertise or resources to run security services Allow for leveraging of Shibboleth code and deployments run by campuses

August 5th, PSU Grid Computing Workshop Use Cases Project leveraging campus attributes –Simplest case Project-operated Shib service –Project operates own service, conceptually easy, but not ideal Campus-operated, project-administered Shib –Ideal mix, but need mechanisms for provisioning of attribute administration

August 5th, PSU Grid Computing Workshop Integration Approach Conceptually, replace Shibboleth’s handle-based authentication with X509 –Provides stronger security for non-web browser apps –Works with existing PKI install base To allow leveraging of Shibboleth install base, require as few changes to Shibboleth AA as possible

August 5th, PSU Grid Computing Workshop GridShib (Simplified) A SSO Shibboleth DN Attributes DN SAML SSL/TLS, WS-Security

August 5th, PSU Grid Computing Workshop Integration Areas Assertion Transmission Attribute Authority Discovery Distribute Attribute Administration User Registration Pseudonymous Interaction Authorization

August 5th, PSU Grid Computing Workshop Assertion Transmission How to get SAML assertions from AA into Globus? Initially: Pull mode with Globus acting as a Shibboleth Attribute Requestor Will explore Pull modes to help with privacy and role combination Implement Grid Name Mapper to map X509 DNs to local identities used to obtain attributes

August 5th, PSU Grid Computing Workshop Attribute Authority Discovery No interactive WAYF service in the Grid Place identifier of Identity Provider in cert –Either in long-term EEC or short-term Proxy Cert Will explore pushing attributes –Avoids the problem –Might also address combined attributes from multiple AAs

August 5th, PSU Grid Computing Workshop Distributed Attribute Administration Campus is ideal for running services, but may not know all attributes of users How does a campus issue attributes for which it is not authoritative? –E.g. IEEE Membership of staff –In Grid case, Project Membership This may be the largest hurdle due to social, political and/or legal issues –Need accepted cookbook for process Plan on exploring signet –

August 5th, PSU Grid Computing Workshop LDAP Getting Attributes into a Site’s Attribute Authority uid: jdoe eduPersonAffiliation: … isMemberOf: … eduPersonEntitlement: … SIS HR On-site Authorities Loaders Person Registry Group Registry Grouper UI Privilege Registry Off-site Authorities Signet UI Attribute Authority Core Business Systems Shib/ GridShib using Shibboleth

August 5th, PSU Grid Computing Workshop User Registration How does the mapping from the User’s X509 DN to local Campus identity get made in NameMapper configuration? In initial version, this will be manual process Yes, far from ideal We envision –Something akin to a registration service that authenticates user’s X509 and local credentials and puts mapping in automatically –Or a portal that hides all the X509 from the user and also handles this mapping E.g. PURSE, GAMA

August 5th, PSU Grid Computing Workshop Pseudonymous Interaction How to maintain Shibboleth pseudonymous functionality with X509? Will develop online CA that issues certificates with non-identifying DNs –Register with AA just as SSO –Basically holder-of-key assertions

August 5th, PSU Grid Computing Workshop Authorization Develop authorization framework in Globus Toolkit Pluggable modules for processing authentication, gathering and processing attributes and rendering decisions XACML used for expressing gathered identity, attribute and policy information –Convert Attributes into common format for policy evaluation –Allows for common evaluation of attributes expressed in SAML and X509 (and others…)

August 5th, PSU Grid Computing Workshop GridShib Status Testing initial version internal to project Will be a drop-in addition to GT 4.0 and Shibboleth 1.3 Current adapting to last minute Shibboleth 1.3 changes and doing internal testing Plan on beta release in 2-3 weeks Looking for interested beta testers

August 5th, PSU Grid Computing Workshop Questions? Project website: – My