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Session ID

Session ID. Georg Carle, John Vollbrecht, Sebastian Zander , Tanja Zseby San Diego, December 2000. Overview. Binding Objectives Binding Concepts Related Work Requirements Session ID Generation Examples Summary. Binding Objectives.

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Session ID

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  1. Session ID Georg Carle, John Vollbrecht, Sebastian Zander, Tanja Zseby San Diego, December 2000

  2. Overview • Binding Objectives • Binding Concepts • Related Work • Requirements • Session ID Generation • Examples • Summary San Diego IETF, December 2000: AAAARCH Meeting - Session ID

  3. Binding Objectives • Authentication, Authorization and Accounting with the Service provisioning process (Service Session) • Accounting records (maybe generated by different hosts) which provide the accounting data for the services a user has used • Different service sessions that logically belong together Binding needed for Auditing and Accounting San Diego IETF, December 2000: AAAARCH Meeting - Session ID

  4. Binding Objectives Session Auth Authoriz Service Usage Accounting Subsession 1 Subsession 2 Time San Diego IETF, December 2000: AAAARCH Meeting - Session ID

  5. Binding Concepts • Hierarchical Binding: Subsession IDs are derived from supersession (e.g. key ring approach) • Peer-to-peer Binding: Two “equal” sessions without specifying hierarchy • Late Binding: Binding is not done during session lifetime but is created later if needed based on attributes (e.g. IP address, start time) San Diego IETF, December 2000: AAAARCH Meeting - Session ID

  6. Related Work • RADIUS • DIAMETER • WWW based Services • RTSP • SIP • SDP/SAP San Diego IETF, December 2000: AAAARCH Meeting - Session ID

  7. Requirements • Binding • Flexibility • Scalability • Session ID • Globally unique • Privacy • Security is important San Diego IETF, December 2000: AAAARCH Meeting - Session ID

  8. Session ID Generation • Server generates ID during initial message exchange (e.g. authentication) • user and/or server specific information • time or increasing number • cryptographic hash • Simple scheme to create global unique ID: AAA ID + Service ID + Session ID • AAA ID: Global unique ID of the AAA server • Service ID: Identify a service at a AAA server • Session ID: Unique ID in the scope of the service San Diego IETF, December 2000: AAAARCH Meeting - Session ID

  9. Example: VoD over Diffserv 1 ID: X ID: X Y User CP X (Content) X Y (Diffserv Access) Y TP 2 TP 1 Z (Diffserv) Z ID: Y ID: Z Z CP: Content Provider TP: Transport Provider San Diego IETF, December 2000: AAAARCH Meeting - Session ID

  10. Example: VoD over Diffserv 2 ID: Y ID: Y Z User CP Y (Content) Z (Diffserv Access) X Y Z TP 2 TP 1 X (Diffserv) ID: X ID: X Z CP: Content Provider TP: Transport Provider San Diego IETF, December 2000: AAAARCH Meeting - Session ID

  11. Example: VoD over Diffserv 3 ID: X ID: X Y , Z User CP X (Content) Y (Diffserv Access) Z V X W Z Y ID: V V (Diffserv) TP 2 TP 1 ID: V W Y W (Diffserv) ID: W Z TP 3 CP: Content Provider TP: Transport Provider San Diego IETF, December 2000: AAAARCH Meeting - Session ID

  12. Example: VoD over Diffserv 3 • Auditing • auditing information is transferred to trusted server during session lifetime • binding is done when needed (i.e. audit request) user  audit_server: query X audit_server  CP: X ... audit_server  user: audit info X, Y, Z, V, W San Diego IETF, December 2000: AAAARCH Meeting - Session ID

  13. Summary • Currently only AAAARCH internal draft • Terminology • Problem Statement • Related Work • Requirements • Examples • Number of open issues San Diego IETF, December 2000: AAAARCH Meeting - Session ID

  14. The End San Diego IETF, December 2000: AAAARCH Meeting - Session ID

  15. Open Issues • How does this work with the different authorization models (RFC2904) • Do we need to encode session hierarchy in the session id? • More precise definitions (i.e. subsession) • Look at SIP, RTSP, SDP/SAP • More examples  rework existing concepts San Diego IETF, December 2000: AAAARCH Meeting - Session ID

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