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GSI Online Credential Retrieval Requirements

GSI Online Credential Retrieval Requirements. Jim Basney jbasney@ncsa.uiuc.edu http://www.ncsa.uiuc.edu/~jbasney/. Online Credential Retrieval Defined. Client. Server. Authenticate. Request Credential. Verify Authorization. Retrieve Credential. Motivation for OCR. Credential management

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GSI Online Credential Retrieval Requirements

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  1. GSI Online Credential RetrievalRequirements Jim Basney jbasney@ncsa.uiuc.edu http://www.ncsa.uiuc.edu/~jbasney/ National Computational Science

  2. Online Credential Retrieval Defined Client Server Authenticate Request Credential VerifyAuthorization Retrieve Credential National Computational Science

  3. Motivation for OCR • Credential management • Securely manage credential files on user’s behalf • Ease use of multiple credentials • Credential translation • Single sign-on to multiple authentication mechanisms and domains • Credential renewal by trusted services • Alternative to delegating long-lived proxies • Indirect credential delegation • Example: web portals National Computational Science

  4. OCR Examples National Computational Science

  5. OCR Implementations • Online Credential Authority • Examples: Online CA, Kerberos KDC • Creates credentials on demand • Vulnerability of authority’s private key a concern • Encrypted credential repository • Credentials stored encrypted in the repository • Credentials may be opaque to protocol and repository • Requires client to decrypt credentials on receipt • Delegating credential repository • Unencrypted credential stored in repository • Server delegates credential to client National Computational Science

  6. Proposed GGF Activity • OCR Requirements document • What OCR services are needed for Grids? • OCR Framework document • Address policy issues of credential repositories, credential translation, credential renewal • Recommendations for interoperability • OCR Protocol document • Define an OCR protocol framework that enables interoperability between different types of OCR services • Share mechanisms between OCR implementations (auditing, delegation tracing, event notification, etc.) National Computational Science

  7. Standards Activity • IETF SACRED WG • Credential format MUST be opaque to the protocol • Protocol MUST NOT force credentials to be present in clear text on the server • IETF PKIX WG • Online Certificate Authorities • Certificate request may include Initial Authentication Key National Computational Science

  8. Protocol Requirements • Mutual authentication • Client-side configuration required to authenticate server • Multiple authentication mechanisms • Password, GSI, Kerberos • Delegate different credential types • X509 cert, X509 proxy, Kerberos ticket • Client can choose among available credentials • Query available credentials and choose • Request credential that meets specification • Administrative protocols • Credential upload and remove • Authorization control (user, administrator, and community) • OGSA-compliant National Computational Science

  9. OCR Issues • Authorization • Restricted delegation • Delegation tracing across multiple mechanisms • Audit trail • Notification services • Compatibility with site security policies • Availability/Replication National Computational Science

  10. Discussion • Is there a need for OCR services in the Grid? • If so, what types of OCR services are needed? • Will production Grid policies allow OCR services? • Centralized key storage • Transitive trust • Is there interest in GGF OCR activity? • Any comments on requirements draft? • Other comments or discussion topics? National Computational Science

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