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Enhancing Identity Management with WS-Trust Protocol

Develop identity management plans for AAI using WS-Trust protocol. Discuss motivation, questionnaires, AAI use cases, technology, and implementation security measures. Presentation at Moonshot, Grid, and HPC Workshop 7.7.2011 in London, UK. Explore STS, interoperability, and token profiles.

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Enhancing Identity Management with WS-Trust Protocol

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  1. EMI Development Plans for Identity Management Henri Mikkonen / HIP Moonshot, Grid and HPC Workshop 7.7.2011 London, UK

  2. Content • Motivation • Questionnaires to potential customers • AAI use cases • Technology • Introduction to WS-Trust • WS-Trust interoperability & token profiles • Implementation • Security Token Service (STS) Henri Mikkonen@ Moonshot, Grid and HPC Workshop

  3. Background • AAI needs of the DCIs -workshop held at EGI Technical Forum (September / 2010) [1] • Questionnaires for projects crossing national boundaries and NGIs • 3 User communities • Biomed, Earth Sciences, HEP • 5 ESFRI projects • CLARIN, Lifewatch, ELIXIR, EuroFEL, ILL • 2 NGIs • Italy, U.K. Henri Mikkonen@ Moonshot, Grid and HPC Workshop

  4. Results for the questionnaire [2] • Grid users do not want to handle credentials themselves • Grid users would like to obtain X.509 credentials and VOMS attributes from other credentials and vice-versa • Projects would like to use federated identities • Projects recognize that both national and international identity federations will become more important • User identities and actions on a Grid should be protected (anonymized) • Projects realize that access to the majority of Grid infrastructures requires and will require in the future X.509 credentials Henri Mikkonen@ Moonshot, Grid and HPC Workshop

  5. AAI use cases [2] Henri Mikkonen@ Moonshot, Grid and HPC Workshop

  6. WS-Trust specification [3] • Builds on WS-Security specification • Methods for issuing, renewing, validating, and canceling security tokens • Trust relationships brokering • Security token: a collection of statements (claims) about a user or resource • X.509 certificate, SAML assertion, Kerberos ticket, Username/Password, … • Security Token Service (STS): a service used to issue, renew, validate and cancel tokens Henri Mikkonen@ Moonshot, Grid and HPC Workshop

  7. WS-Trust schema fragment (1/2) • RequestSecurityToken (RST) <xs:element name="RequestSecurityToken" type="wst:RequestSecurityTokenType" /> <xs:complexType name="RequestSecurityTokenType"> <xs:annotation> <xs:documentation>Actual content model is non-deterministic, hence wildcard. The following shows intended content model: <xs:element ref='wst:TokenType' minOccurs='0' /> <xs:element ref='wst:RequestType' /> <xs:element ref='wsp:AppliesTo' minOccurs='0' /> <xs:element ref='wst:Claims‘ minOccurs='0' /> <!-- …22 other optional elements… --> <xs:any namespace='##other‘ processContents='lax' minOccurs='0' maxOccurs='unbounded’ /> </xs:documentation> </xs:annotation> <xs:sequence> <xs:any namespace="##any" processContents="lax" minOccurs="0" maxOccurs="unbounded" /> </xs:sequence> <xs:attribute name="Context" type="xs:anyURI" use="optional" /> <xs:anyAttribute namespace="##other" processContents="lax" /> </xs:complexType> Henri Mikkonen@ Moonshot, Grid and HPC Workshop

  8. WS-Trust schema fragment (2/2) • RequestSecurityTokenResponse (RSTR) <xs:element name="RequestSecurityTokenResponse" type="wst:RequestSecurityTokenResponseType" /> <xs:complexType name="RequestSecurityTokenResponseType"> <xs:annotation> <xs:documentation>Actual content model is non-deterministic, hence wildcard. The following shows intended content model: <xs:element ref='wst:TokenType' minOccurs='0' /> <xs:element ref='wst:RequestType' /> <xs:element ref='wst:RequestedSecurityToken' minOccurs='0' /> <xs:element ref='wsp:AppliesTo' minOccurs='0' /> <!-- …15 other optional elements… --> <xs:any namespace='##other' processContents='lax' minOccurs='0' maxOccurs='unbounded’ /> </xs:documentation> </xs:annotation> <xs:sequence> <xs:any namespace="##any" processContents="lax" minOccurs="0" maxOccurs="unbounded" /> </xs:sequence> <xs:attribute name="Context" type="xs:anyURI" use="optional" /> <xs:anyAttribute namespace="##other" processContents="lax" /> </xs:complexType> Henri Mikkonen@ Moonshot, Grid and HPC Workshop

  9. WS-Trust profiles [4] • The specification provides an open content model for messages • Provides maximal extensibility, but theoretically infinite number of messages can be compliant • Profiles need to be defined for achieving interoperability • This effort was already started by Chad La Joie in the EGEE-III project • WS-Trust interoperability profile • Token-specific profiles (X.509, SAML, Username) Henri Mikkonen@ Moonshot, Grid and HPC Workshop

  10. WS-Trust Interoperability profile • Base protocol requirements • SOAP-binding, common message format requirements and processing rules • Operation-specific requirements • Also, profiles for • XML-Signature • XML-Encryption • Proof of key possession • Message security (integrity / confidentiality) Henri Mikkonen@ Moonshot, Grid and HPC Workshop

  11. STS functionality overview • Authenticates and “authorizes” users based on security tokens • Transforms the security token into another security token • Aggregates required information from external sources • Establishes a trust relationship between different application domains Henri Mikkonen@ Moonshot, Grid and HPC Workshop

  12. STS Example Use Case – SAML to X.509 – (1/2) Henri Mikkonen@ Moonshot, Grid and HPC Workshop

  13. STS Example Use Case – SAML to X.509 – (2/2) Henri Mikkonen@ Moonshot, Grid and HPC Workshop

  14. STS Implementation Plan (1/2) • The first version will support the ISSUE operation • Supported inbound tokens (used for the user authentication): • X.509, X.509 Proxy, SAML, Kerberos • Supported outbound tokens: • X.509, using external online CA • X.509 Proxy, exploiting VOMS • SAML Henri Mikkonen@ Moonshot, Grid and HPC Workshop

  15. STS Implementation Plan (2/2) • Implementation is based on the upcoming Shibboleth IDP & OpenWS/SAML v3 (Shib3) • Existing building blocks for the service: • Authentication Engine API • Attribute Authority • Required extensions: • WS-Trust Profile Handler • Authentication Engine plug-ins for inbound tokens • Token Authority for outbound tokens Henri Mikkonen@ Moonshot, Grid and HPC Workshop

  16. References • [1] EGI TF 2010: AAI needs of the DCIs • https://www.egi.eu/indico/sessionDisplay.py?sessionId=11&confId=48#20100914 • [2] EMI AAI Working Group • https://twiki.cern.ch/twiki/bin/view/EMI/EmiJra1T4AAI • [3] OASIS Standard: WS-Trust 1.3 • http://docs.oasis-open.org/ws-sx/ws-trust/200512 • [4] Chad La Joie / SWITCH: WS-Trust 1.3 Interoperability profile • http://www.switch.ch/grid/support/documents/ Henri Mikkonen@ Moonshot, Grid and HPC Workshop

  17. Thank you!

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