hostapd: rsn replay counters issue

Dmitry Shmidt dimitrysh at google.com
Wed Feb 29 19:19:47 EST 2012


On Wed, Feb 29, 2012 at 3:02 PM, Jouni Malinen <j at w1.fi> wrote:
> On Wed, Feb 29, 2012 at 10:23:02AM -0800, Dmitry Shmidt wrote:
>> According to the src/ap/wpa_auth_ie.c code:
>> Setting 16 rsn replay counters depends on if WMM mode was set.
>>
>> int wpa_write_rsn_ie()
>> {
>> ...
>>         if (conf->wmm_enabled) {
>>               /* 4 PTKSA replay counters when using WMM */
>>               capab |= (RSN_NUM_REPLAY_COUNTERS_16 << 2);
>>       }
>> ...
>> }
>>
>> However, if I don't want for my hostap to support WMM, it breaks ability to use
>> WPA/WPA2 security.
>
> Why would that break WPA/WPA2 security? If you do not enable WMM/QoS,
> you don't need 16 replay counters..
>
> Or are you running to an issue where the driver/firmware ends up
> generating different WPA/RSN IE for Beacon/Probe Response and supplicant
> rejects that due to mismatch in IEs? That has been somewhat of a common
> bug with multiple drivers where the IEs do not get synchronized properly
> between the driver and hostapd.

Thanks ! This is what I suspected.

>
> --
> Jouni Malinen                                            PGP id EFC895FA
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