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Needham-Schroeder Key Descriptor

Needham-Schroeder Key Descriptor. Robert G. Moskowitz ICSAlabs IEEE 802 Plenary Meeting Kauai, Nov 12, 2002. Needham-Schroeder Method. AS. Supp. Credential Request. Encrypted Credential. Auth’ed Credential. Auth. Auth’ed ACK. Needham-Schroeder in an EAP method.

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Needham-Schroeder Key Descriptor

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  1. Needham-Schroeder Key Descriptor Robert G. Moskowitz ICSAlabs IEEE 802 Plenary Meeting Kauai, Nov 12, 2002 Needham-Schroeder Key Descriptor

  2. Needham-Schroeder Method AS Supp Credential Request Encrypted Credential Auth’ed Credential Auth Auth’ed ACK Needham-Schroeder Key Descriptor

  3. Needham-Schroeder in an EAP method • Model is the reverse of many EAP methods • The Supplicant drives the authentication • Initial Request might be just a filler record • Needham-Schroeder Request goes into an EAP Response • EAP finishes with the Supplicant having the credential for the Authenticator • But Needham-Schroeder exchange is not complete • Supplicant needs a methodology to deliver the credential to the Authenticator Needham-Schroeder Key Descriptor

  4. Needham-Schroeder in an EAP method • Authenticator needs a methodology to reply to the supplicant • After which, the authentication is Successful, i.e. the EAP method is Successful • This can best be performed in an EAPOL-Key Exchange Needham-Schroeder Key Descriptor

  5. 802.1x/EAP Exchange • The 802.1x/EAP flow for Kerberos might be • AUTH: EAP Ident REQ • SUPP: EAP Ident REP • AS: EAP REQ -- Kerberos • SUPP: EAP REP -- KRB_AS_REQ • AS: EAP REQ -- KRB_AS_REP • SUPP: EAPOL-Key -- KRB_AP_REQ • AUTH: EAPOL-Key -- KRB_AP_REP • SUPP: EAP REP -- Finished • AS: RADIUS Accept • AUTH: EAP Success Needham-Schroeder Key Descriptor

  6. 802.1x/EAP Reconnect Exchange • The 802.1x/EAP flow for Kerberos might be • AUTH: EAP Ident REQ • SUPP: EAP Ident REP • AS: EAP REQ -- Kerberos • SUPP: EAPOL-Key -- KRB_AP_REQ • AUTH: EAPOL-Key -- KRB_AP_REP • SUPP: EAP REP -- Finished • AS: RADIUS Accept • AUTH: EAP Success Needham-Schroeder Key Descriptor

  7. EAPOL-Key Format Octet Number 1 1 2-3 4-N Descriptor Type (7.6.1) EAP Type Length Needham-Schroeder Body Needham-Schroeder Key Descriptor

  8. Samples of Needham-Schroeder Body • KRB_AP_REQ (RFC 1510) • KRB_AP_REP (RFC 1510) Needham-Schroeder Key Descriptor

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