WPS : Configuration methods attribute in WPS M2

[Jouni Malinen]

On Fri, Oct 09, 2015 at 08:44:19PM +0000, Atul Joshi wrote:
> we are using hostapd 2.4 for WPS testing.
> 
> We observed that, if we configure "label virtual_display virtual_push_button keypad"
> 
> We don't see pushbutton/virtual push button in the M2 message sent by the AP.
> 
> I understand from WPS spec that in probe responses, we need to mask it off but for M2 there is no such requirement. Then why the hostapd is masking the bits off?

It shouldn't be masking config_methods bits from M2. I cannot reproduce
this with the current snapshot. With config_methods="label
virtual_display virtual_push_button keypad", M2 from hostapd goes out
with Config Methods 0x238c (i.e., Label, Display, Virtual Display, Push
Button, Virtual Push Button, and Keypad bits set to 1).

I'm not sure how you are testing this, but please keep in mind that if
the AP has UPnP enabled, the M2 could be from an external Registrar and
hostapd is just proxying it to the Enrollee.

-- 
Jouni Malinen                                            PGP id EFC895FA