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EAP Authentication for SIP draft-torvinen-http-eap-01.txt

EAP Authentication for SIP draft-torvinen-http-eap-01.txt. Aki.Niemi@nokia.com Vesa.Torvinen@ericsson.fi Jari.Arkko@ericsson.com. EAP Authentication for SIP. Extensible Authentication Protocol (RFC 2284) Originally used in PPP New applications emerged, e.g., IEEE 802.1X

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EAP Authentication for SIP draft-torvinen-http-eap-01.txt

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  1. EAP Authentication for SIPdraft-torvinen-http-eap-01.txt Aki.Niemi@nokia.com Vesa.Torvinen@ericsson.fi Jari.Arkko@ericsson.com

  2. EAP Authentication for SIP • Extensible Authentication Protocol (RFC 2284) • Originally used in PPP • New applications emerged, e.g., IEEE 802.1X • New auth-scheme for HTTP Authentication Framework (RFC 2617) • Intended for initial authentication - could be used for session key or ticket generation for subsequent protection • Adding new authentication methods under EAP requires no changes to SIP • Protocol specification stays the same • OS EAP APIs • Offloading EAP to AAA servers

  3. SIP Authentication Today SIP HTTP Authentication S/MIME MIME PGP . . . HTTP Basic HTTP Digest HTTP Eap EAP Token Card EAP TLS EAP SRP EAP AKA EAP ...

  4. So Who Needs Extensible Authentication? • Originally a requirement from 3GPP • Necessary for any organization that needs past or future authentication schemes • Security always needs set-up and infrastructure, both of which are typically tied to the used authentication schemes • Undesirable to change existing infrastructure • Most of the cost is in the cards, processes • E.g., 3GPP handsets have SIM cards • Avoid additional user configuration

  5. Issues with HTTP Eap • We have chosen to do only authentication • Initial auth followed by e.g. Digest integrity • Or extending HTTP Eap to cover also integrity • Base64 encoded EAP in auth headers • Usually not very large • HTTP auth derived problems • Multi-proxy authentication problem fixed • Extra RTTs with EAP_ID_REQ • The next draft version adds a username param to HTTP EAP which avoids this

  6. Conclusion • There is a requirement to support extensible and legacy authentication • We believe something like this is needed for SIP • Not just for 3GPP • Some protocol detail issues to discuss • What to do with the session keys - integrity protection • Similar header interpretation issues as in Digest • Base64 data (typically short, though) • Time pressure from 3GPP

  7. A Way Forward • Work item for SIP • Need input from the WG • Technical issues • Security issues

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