Re: [Bluez-devel] Error: Authentication Failure

["Claudio Takahasi" <cktakahasi@gmail.com>]

On 10/3/06, Jose Vasconcellos <jose@vasmac.com> wrote:
> I've run into authentication problems doing the following:
>
> 1. Pair device (say headset) with USB Bluetooth dongle on Linux with Bluez.
> 2. Disconnect dongle and insert on Windows. Windows will ask for
>     the key.
> 3. Disconnect device from Windows and put back on Linux.
>     Linux is unable to connect to the device.
>
> Here's a trace for step 3:
>
> HCI sniffer - Bluetooth packet analyzer ver 1.32
> < HCI Command: Create Connection (0x01|0x0005) plen 13
>     bdaddr 00:14:CF:00:A7:76 ptype 0xcc18 rswitch 0x01 clkoffset 0x0000
>     Packet type: DM1 DM3 DM5 DH1 DH3 DH5
>  > HCI Event: Command Status (0x0f) plen 4
>     Create Connection (0x01|0x0005) status 0x00 ncmd 1
>  > HCI Event: Link Key Request (0x17) plen 6
>     bdaddr 00:14:CF:00:A7:76
> < HCI Command: Link Key Request Reply (0x01|0x000b) plen 22
>     bdaddr 00:14:CF:00:A7:76 key 3FECD3A6AB67EA063B3E78CCB155CBC1
>  > HCI Event: Command Complete (0x0e) plen 10
>     Link Key Request Reply (0x01|0x000b) ncmd 1
>     status 0x00 bdaddr 00:14:CF:00:A7:76
>  > HCI Event: Connect Complete (0x03) plen 11
>     status 0x05 handle 42 bdaddr 00:14:CF:00:A7:76 type ACL encrypt 0x00
>     Error: Authentication Failure
> < HCI Command: Create Connection (0x01|0x0005) plen 13
>     bdaddr 00:0C:55:06:CE:46 ptype 0xcc18 rswitch 0x01 clkoffset 0x0000
>     Packet type: DM1 DM3 DM5 DH1 DH3 DH5
>  > HCI Event: Command Status (0x0f) plen 4
>     Create Connection (0x01|0x0005) status 0x00 ncmd 1
>  > HCI Event: Link Key Request (0x17) plen 6
>     bdaddr 00:0C:55:06:CE:46
> < HCI Command: Link Key Request Reply (0x01|0x000b) plen 22
>     bdaddr 00:0C:55:06:CE:46 key 843E102AA026008F44FC7A2D5DDE0306
>  > HCI Event: Command Complete (0x0e) plen 10
>     Link Key Request Reply (0x01|0x000b) ncmd 1
>     status 0x00 bdaddr 00:0C:55:06:CE:46
>  > HCI Event: Connect Complete (0x03) plen 11
>     status 0x05 handle 42 bdaddr 00:0C:55:06:CE:46 type ACL encrypt 0x00
>     Error: Authentication Failure
>
> The problem is that hcid contains a cached key that is no longer valid.
> Once it gets the first authentication failure it should discard that
> and ask the user for a new pin (i.e. invoke the passkey agent) but it
> doesn't do that. I've tested with bluez-utils-3.7.
>
> Regards,
>
> Jose
>
>
>
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Hi Jose,

Good catch! if there is an invalid cached key the client must call
RemoveBonding to remove the invalid entry. I will check with Marcel if
it is possible remove the key automatically on this situation without
insert a complex code. I am not sure, but I think some implementations
drop the connection automatically when the pairing fails. Consequently
ask a new PIN automatically will be more complex.

BR,
Claudio.
-- 
---------------------------------------------------------
Claudio Takahasi
Instituto Nokia de Tecnologia - INdT

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