stuck on "send EAP Response Identity"

Hi, reaver14 gets stuck on "send EAP Response Identity".
From BT5r2 I run the following:

airmon-ng start wlan0
reaver -i mon0 -b xx:xx:xx:xx:xx:xx
client send auth, ap answer auth ok
client send wps assoc, ap answer ok
client send EAPOL Start, ap anwer EAP   Request, Identity [RFC3748]
client send EAP Response, Identity [RFC3748], ap answer EAP Request, Expanded 
Type [RFC3748], WPS

and here all stop.. the tool hangs forever, and never sends any "Response, 
Expanded Type" back to the ap..
In my opinion, it looks like after "EAP Response, Identity" the tool expects a 
M1 frame from ap (containing ENonce, PK_E , EnrolleeMAC, keys and so on) but 
instead it receives only that "EAP Request, Expanded Type" frame.. such frame 
has the following structure:

No.     Time        Source                Destination           Protocol Length 
Info
     45 15.828384   xx:xx:xx:xx:xx:xx     Apple_yy:yy:yy        EAP      80     Request, Expanded Type [RFC3748], WPS
Frame 45: 80 bytes on wire (640 bits), 80 bytes captured (640 bits)
Radiotap Header v0, Length 26
IEEE 802.11 Data, Flags: ......F.C
Logical-Link Control
    DSAP: SNAP (0xaa)
    IG Bit: Individual
    SSAP: SNAP (0xaa)
    CR Bit: Command
    Control field: U, func=UI (0x03)
        000. 00.. = Command: Unnumbered Information (0x00)
        .... ..11 = Frame type: Unnumbered frame (0x03)
    Organization Code: Encapsulated Ethernet (0x000000)
    Type: 802.1X Authentication (0x888e)
802.1X Authentication
    Version: 1
    Type: EAP Packet (0)
    Length: 14
    Extensible Authentication Protocol
        Code: Request (1)
        Id: 1
        Length: 14
        Type: Expanded Type [RFC3748] (254)
        Expanded Type (Wifi Alliance, WifiProtectedSetup)
            Vendor Id: WFA (0x372a)
            Vendor Type: SimpleConfig (0x01)
            Opcode: WSC Start (1)
            Flags: 0x00
                .... ...0 = More flag: False
                .... ..0. = Length field present: False

of course all that was monitored using Wireshark, and tested RTL and Atheros 
cards..
Why reaver doesnt send the "Response, Expanded Type" to the ap?
Thanks
Original issue reported on code.google.com by niki...@cooltoad.com on 26 Aug 2012 at 8:39
fauzan505 / reaver-wps

stuck on "send EAP Response Identity" #388
