Re: [Bluez-users] pand seem to ignore any pin configurations

[Rainer Dorsch <rdorsch@web.de>]

Hi Marcel,

Am Sonntag, 8. Mai 2005 15:36 schrieb Marcel Holtmann:
> > > if you use "security user" then the PIN is provided through the PIN
> > > helper script.
> >
> > and auto just uses the pin in
> >
> > /etc/bluetooth/pin ?
>
> for incoming connection, yes.
>
> > Then all the helper scripts in the net which print out
> >
> > PIN: <content of /etc/bluetooth/pin>
> >
> > are nonsense?
>
> No. Why should they. The script got called and then it reads the pin and
> writes it to standard out. Think about it ;)

Wouldn't be

security auto 

the same as

        security user
        # PIN helper
        # pin_helper /usr/bin/bluez-pin;
        pin_helper /usr/local/sbin/mypin

 and /usr/local/sbin/mypin, containing 

        #!/bin/sh
        PIN=`cat /etc/bluetooth/pin`
        echo "PIN:$PIN"

?

> > Hmm....is pairing persistent over rebooting one or both systems (NAP:
> > security auto and PANU: security user)? At least that is what I did and I
> > did not enter a password. pin_helper is bluez-pin on the PANU, so I
> > expect that PANU should have querried for a password in any case.
>
> The pairing itself is persistent over reboots and also unplugging. The
> link keys are also cached inside the chip and so Authentication
> Requested must not always result in asking for the link key or pin code.
>
> > Replugging the usb bt dongle restarts bluez-utils. Is pairing persistent
> > over restarting bluez-utils?
> >
> > Is it ok that pand on the PANU dies after connection establishment?
> >
> > root      4296  0.0  0.2  1548  492 ?        S<   14:48   0:00
> > /usr/bin/pand --nodetach --role PANU --search --encrypt
> > root      4303  0.0  0.2  1548  472 pts/2    S+   14:49   0:00 grep pand
> > topsi:~# ps uaxwww|grep pand
> > root      4397  0.0  0.2  1548  472 pts/2    S+   14:50   0:00 grep pand
> > topsi:~#
> >
> >
> > I did an hcidump after replugging the bt usb dongle on PANU, hcidump is
> > also
> >
> > on PANU:
> > > HCI Event: Link Key Request (0x17) plen 6
> >
> >   0000: 9f 24 82 61 04 00                                 .$.a..
> > < HCI Command: Link Key Request Reply (0x01|0x000b) plen 22
> >   0000: 9f 24 82 61 04 00 bf 9c  53 9d f1 8e fb 60 50 c7 
> > .$.a....S....`P. 0010: 11 26 ac e3 16 06                                
> > .&....
> >
> > > HCI Event: Command Complete (0x0e) plen 10
> >
> >     Link Key Request Reply (0x01|0x000b) ncmd 1
> >     0000: 00 9f 24 82 61 04 00                              ..$.a..
>
> It asks for the link key and so you are pairing. To always be asked for
> the PIN code I think you need to change hcid to allow a mode where you
> always have to redo the pairing. In this case the Link Key Request must
> be answered with a Link Key Request Negative Reply. This effect can also
> be reached by deleted the link key from the local storage.

Not asking for a PIN each time is actually fine (persisten pairing is a nice 
invention;-). I just want to check that the system really wants to see a PIN 
when a new device comes in.

Are you saying when I delete

	/etc/bluetooth/link_key

on both NAP and PANU I should be askef for a password?

Thanks,
Rainer



>
> Regards
>
> Marcel
>
>
>
>
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-- 
Rainer Dorsch
Alzentalstr. 28
D-71083 Herrenberg
07032-919495
Icq: 32550367


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