Hi Colin,
On Thu, 2011-08-04 at 08:17 -0400, Johan Hedberg wrote:
> Hi Colin,
>
> On Thu, Aug 04, 2011, Colin Beckingham wrote:
> > I'd like to provide some feedback regarding a Samsung WEP475 headset
> > which fails to connect to linux specifically.
> >
> > The USB bluetooth adapter is a Model: Belkin BLUETOOTH USB +EDR
> > ADAPTER v2.1 UHE which successfully interconnects with 2 Jabra and 1
> > Plantronics headsets, plus a Nokia E71 phone. Samsung WEP475
> > successfully connects to a Windows XP machine and to the Nokia E71.
> >
> > Using Opensuse 11.4 with custom kernel 3.0 currently, (also fails
> > with 2.6.38), bluez 4.96 and bluedevil manager.
> >
> > Symptoms are that bluedevil sees the headset in pairing mode and
> > correctly retrieves the name WEP475, connected button flashes green
> > and then returns to grey (not connected). WEP475 led changes to
> > connected status but bluedevil shows headset not connected and
> > headset does not work.
> >
> > With bluetoothd in debug mode, I get the following transactions in
> > /var/log/messages:
>
> There seems to be something strange going on with the secure simple
> pairing logic. For some reason the initial link key isn't good enough
> (auth request + link key negative reply after the initial key has been
> generated) and then there's a user confirm negative reply for the second
> attempt. It'd be good to get to the bottom of this and fix it properly,
> but meanwhile you can probably work around this by disabling SSP on your
> side (hciconfig hci0 sspmode 0) and retrying pairing.
You're having this problem because the remote device supports SSP but
not MITM protection. Some socket is requiring BT_SECURITY_HIGH (thus
requiring MITM) -- therefore the kernel is correctly disconnecting and
returning 'Authentication Failure' (although returning 'Insufficient
Authentication' would probably be better).
I think the GATT browser is demanding BT_SECURITY_HIGH -- not sure why
though (I don't think it needs to. I'll get back to you on that...)
Regards,
Peter
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