Plan 9: WiFi Protected Setup

 

Demo of Wifi router connection using WiFi Protected Setup (WPS).

WiFi Protected Setup (WPS) allows you to connect to an Access Point (router) via push button or a temporary PIN.

 

Authentication Flow 

Direction Message / Contents Phase / Purpose
Supplicant → AP Authentication Request 802.11 Authentication
Supplicant ← AP Authentication Response
Supplicant → AP Association Request 802.11 Association
Supplicant ← AP Association Response
Supplicant → AP EAPOL-Start EAP Initiation
Supplicant ← AP EAP-Request Identity
Supplicant → AP EAP-Response Identity
(Identity: “WFA-SimpleConfig-Registrar-1-0”)
Supplicant ← AP WSC Start
Enrollee → Registrar (M1) N1 || Description || PKₑ Diffie-Hellman Key Exchange
Enrollee ← Registrar (M2) N1 || N2 || Description || PKᵣ || Authenticator
Enrollee → Registrar (M3) N2 || E-Hash1 || E-Hash2 || Authenticator Commit to PIN values
Enrollee ← Registrar (M4) N1 || R-Hash1 || R-Hash2 || EKeyWrapKey(R-S1) || Authenticator Prove possession of 1st half of PIN
Enrollee → Registrar (M5) N2 || EKeyWrapKey(E-S1) || Authenticator Prove possession of 1st half of PIN
Enrollee ← Registrar (M6) N1 || EKeyWrapKey(R-S2) || Authenticator Prove possession of 2nd half of PIN
Enrollee → Registrar (M7) N2 || EKeyWrapKey(E-S2 || ConfigData) || Authenticator Prove 2nd half of PIN; send AP configuration
Enrollee ← Registrar (M8) N1 || EKeyWrapKey(ConfigData) || Authenticator Set AP configuration
 

Code

 

References

  1. Quick introduction to WPS
  2. Reaver codebase
  3. HostAP codebase  

 

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