Re: [Bluez-users] implementing security mode 2 or 3

[Marco Trudel <mtrudel@gmx.ch>]

Hello Marcel

Marcel Holtmann wrote:
> Hi Marco,
> 
> 
>>this works great with a 2.6.11 kernel.
>>Unfortunately I'm bound to kernel 2.4.26 or 2.6.7.
>>2.4.26 doesn't work. It just let's remote devices connect...
>>Do you know if 2.6.7 will?
> 
> 
> the 2.6.7 will fail. The needed security hooks are introduced with
> 2.6.10 and the RFCOMM service level security with 2.6.11 according to my
> patch logs.
> 
> 
>>If not, which part of the kernel has to be fixed? Is it a part of bluez?
> 
> 
> It is inside the BlueZ core and the RFCOMM layer.

How long would you have to backport that to kernel 2.6.7?
Maybe we can arrainge something with a donation...

I assume it's easier to backport it to 2.6.7, if 2.4.26 is easier, please 
let me know.

>>Can this encryption be reached in another way?
> 
> 
> In general yes. You must call the HCI functions, but it is impossible to
> call them at the correct time (after the SABM).

ok. so backporting would be the best option.

>>Where are the link keys saved? I'm unable to find them.
> 
> 
> Starting with bluez-utils-2.16 under /var/lib/bluetooth/*/linkkeys.

found them, thank you.

>>Is there something that has to be paid attention to if I do encryption like 
>>this? Does the password/Dongle/... influence the encryption strength?
> 
> 
> The encryption key size is the only thing that may vary. For CSR chips
> it can be between 56 bits and 128 bits depending on the firmware.

ok. thank you.


regards
Marco


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