hostapd / ath9k 4-way handshake fail

Hector Akamine hectoraka at gmail.com
Tue Jul 14 22:03:39 EDT 2009


Hi,

>> I wanted to compare PMK,PTK in hostapd and wpa_supplicant but messages show
>> "[REMOVED]" instead of the keys. Is it possible to configure them to show the 
>> keys?
> 
> You can use "-K" option.

Masashi, thank you for the tip.


Taking a look at the debug messages, I found that hostapd and wpa_supplicant 
create different PSKs from the same SSID and passphrase (so the PMK PTK
calculated later are different):

hostapd log (excerpt):

Using interface wlan1 with hwaddr 00:0d:02:3b:0a:96 and ssid 'hostapdAP-sta001'

SSID - hexdump_ascii(len=16):
     68 6f 73 74 61 70 64 41 50 2d 73 74 61 30 30 31   hostapdAP-sta001
PSK (ASCII passphrase) - hexdump_ascii(len=10):
     73 74 61 30 30 31 70 61 73 73                     sta001pass      
PSK (from passphrase) - hexdump(len=32): 18 40 0d 03 5a e6 b7 db b0 bf ca cd 
b9 de 38 59 ba 9f d0 99 2d 35 6e a6 73 3b f0 e2 26 2e 8e 18
WPA: group state machine entering state GTK_INIT (VLAN-ID 0)


wpa_supplicant log (excerpt) :

Line: 9 - start of a new network block
ssid - hexdump_ascii(len=16):
     68 6f 73 74 61 70 64 41 50 2d 73 74 61 30 30 31   hostapdAP-sta001
proto: 0x1
key_mgmt: 0x2
pairwise: 0x8
group: 0x8
PSK (ASCII passphrase) - hexdump_ascii(len=10):
     73 74 61 30 30 31 70 61 73 73                     sta001pass      
PSK (from passphrase) - hexdump(len=32): 53 55 0b 81 d4 d3 a1 74 06 17 7d 3a
 07 fe bc c9 0d 48 ea 0b 03 5a fd a2 5f d3 bd 80 f7 ce da 78

I expected both PSKs to be the same.
Isn't the PSK only dependent on the passphrase and the SSID? 


Best regards,
Hector





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