GSI Online Credential Retrieval Requirements. Jim Basney

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1 GSI Online Credential Retrieval Requirements Jim Basney

2 Online Credential Retrieval Defined Client Server Authenticate Request Credential Verify Authorization Retrieve Credential

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

4 OCR Examples Service MyProxy K5Cert Auth Method Password Kerberos Credential X509 user proxy K5 CA issued X509 cert CAS GSI X509 community proxy GSIklog SSLK5 GSI SSL AFS token Kerberos ticket Kerberos KDC AS_REQ+preauth Kerberos ticket CA OOB or IAK CA issued X509 certificate

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

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.)

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

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

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

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?

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