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A Network Enrollment Protocol

A Network Enrollment Protocol. Duncan Kitchin, Intel. Problem Statement. 802.11 requires per-node configuration SSID encryption keys, mechanisms This is too complex for many products and/or users TVs, VCRs, DVD players (no keyboard…) consumers expect these products to work out of the box

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A Network Enrollment Protocol

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  1. A Network Enrollment Protocol Duncan Kitchin, Intel Duncan Kitchin, Intel

  2. Problem Statement • 802.11 requires per-node configuration • SSID • encryption keys, mechanisms • This is too complex for many products and/or users • TVs, VCRs, DVD players (no keyboard…) • consumers expect these products to work out of the box • Security implications • the greatest security flaw we could introduce is making the system too difficult to configure correctly Duncan Kitchin, Intel

  3. Proposed Solution – What the User Sees • User sees “press a button at either end” enrollment • same as used for garage door openers, cordless phones, cordless mice, keyboards • Pressing a button on the AP makes it temporarily “open for enrollment” • Two buttons at station, “scan” and “enroll” • first “illuminates” APs, cycling through list • second attempts enrollment in last AP illuminated Duncan Kitchin, Intel

  4. New Packets • Use new generic management type & subtype, with action “enroll” • subaction “illuminate” • subaction “enroll request” • subaction “enroll response” Duncan Kitchin, Intel

  5. Scanning • Station determines available APs by existing active or passive scanning, and maintains a list • Each time the “scan” button is pressed, sends an enroll/illuminate packet to the next AP on the list • An AP receiving an enroll/illuminate packet emits an audible or visual indication Duncan Kitchin, Intel

  6. Enrollment Process • Station and AP create a Diffie-Hellman tunnel • Station creates DH value, sends to AP • AP never advertises that it is open, but accepts an enrollment request if it is and responds with its own DH value and encrypted parameters • The tunnel is then used by the AP to send back to the station: • credentials for future authentication • other configuration parameters such as SSID Duncan Kitchin, Intel

  7. Packet Formats • See 00/xxx for generic management frame type • enroll/illuminate • no additional contents • enroll/request • Diffie-Hellman element • enroll/response • Diffie-Hellman element • configuration data, plus encrypted-content security credential elements Duncan Kitchin, Intel

  8. Process Summary enroll/illuminate indication enroll/illuminate indication request enroll/request enroll/response Duncan Kitchin, Intel

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