linux-kernel - Re: Regression caused by "Bluetooth: Map sec

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Date:	Thu, 09 Jun 2011 10:01:17 -0700
From:	Keith Packard <keithp@...thp.com>
To:	Johan Hedberg <johan.hedberg@...il.com>,
	Waldemar.Rymarkiewicz@...to.com
Cc:	padovan@...fusion.mobi, marcel@...tmann.org,
	linux-bluetooth@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: Regression caused by "Bluetooth: Map sec_level to link key requirements"

On Thu, 9 Jun 2011 17:33:45 +0900, Johan Hedberg <johan.hedberg@...il.com> wrote:

> The patch was not only fine but actually *needed* by the BITE. So
> reverting it will make some qualification tests fail.

Yeah, it seemed pretty obvious that the patch added some useful security
checks.

> There's no DUN support in the N900 by default and the only package I'm
> aware that provides it uses the command line rfcomm tool with high
> security on the socket to block just-works SSP pairing (since the rfcomm
> tool doesn't use the authorization framework to guarantee a user pop-up
> dialog). The SyncML code I can't comment on since I haven't seen it.

Service Name: Dial-Up Networking
Service RecHandle: 0x10000
Service Class ID List:
  "Dialup Networking" (0x1103)
  "Generic Networking" (0x1201)
Protocol Descriptor List:
  "L2CAP" (0x0100)
  "RFCOMM" (0x0003)
    Channel: 1
Profile Descriptor List:
  "Dialup Networking" (0x1103)
    Version: 0x0100

> So potentially this might be limited to high security sockets.
> Speculating further, if the device connecting to the N900 has a pre-2.1
> Bluetooth controller this could simply be about not having a 16-digit
> PIN which high security services require.

> So could whoever is able to
> reproduce the issue try repairing and entering a 16-digit PIN to see if
> the problem goes away?

I re-pair'ed using a manually entered a 16 digit pin, but now DUN setup
doesn't succeed at all.

> And if this is in fact the case then the kernel
> code is working exactly as it should; the only issue is that these
> services should really be using medium security level instead of high.

I cannot figure out how to reconfigure things so that they work again.

> hcidump -Rt > foo.log  from your test session will help as well

here's a dump of trying to start the syncml session:

HCI sniffer - Bluetooth packet analyzer ver 2.0
device: hci0 snap_len: 1028 filter: 0xffffffff
2011-06-09 09:36:27.729606 < 01 05 04 0D 6E F5 C1 5B 9B EC 18 CC 02 00 00 00 01 
2011-06-09 09:36:27.731045 > 04 0F 04 00 01 05 04 
2011-06-09 09:36:28.281075 > 04 12 08 00 6E F5 C1 5B 9B EC 01 
2011-06-09 09:36:28.435069 > 04 03 0B 00 0C 00 6E F5 C1 5B 9B EC 01 00 
2011-06-09 09:36:28.435115 < 01 1B 04 02 0C 00 
2011-06-09 09:36:28.437015 > 04 1B 03 0C 00 05 
2011-06-09 09:36:28.438023 > 04 0F 04 00 01 1B 04 
2011-06-09 09:36:28.439017 > 04 0B 0B 00 0C 00 BF EE 0F C6 98 3D 59 82 
2011-06-09 09:36:28.439051 < 01 1C 04 03 0C 00 01 
2011-06-09 09:36:28.441060 > 04 1B 03 0C 00 03 
2011-06-09 09:36:28.443060 > 04 0F 04 00 01 1C 04 
2011-06-09 09:36:28.448100 > 04 23 0D 00 0C 00 01 01 01 00 00 00 00 00 00 00 
2011-06-09 09:36:28.448133 < 01 19 04 0A 6E F5 C1 5B 9B EC 02 00 00 00 
2011-06-09 09:36:28.450059 > 04 0F 04 00 01 19 04 
2011-06-09 09:36:28.470089 > 04 07 FF 00 6E F5 C1 5B 9B EC 6E 61 6D 69 00 00 00 00 00 00 
  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 
  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 
  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 
  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 
  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 
  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 
  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 
  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 
  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 
  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 
  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 
  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 
2011-06-09 09:36:28.470129 < 01 11 04 02 0C 00 
2011-06-09 09:36:28.472099 > 04 0F 04 00 01 11 04 
2011-06-09 09:36:28.473061 > 04 17 06 6E F5 C1 5B 9B EC 
2011-06-09 09:36:28.473193 < 01 0B 04 16 6E F5 C1 5B 9B EC CC CB 2A 77 3C 2E 5E 6B 75 87 
  67 EC 03 40 67 8E 
2011-06-09 09:36:28.485125 > 04 0E 0A 01 0B 04 00 6E F5 C1 5B 9B EC 
2011-06-09 09:36:28.503097 > 04 06 03 00 0C 00 
2011-06-09 09:36:28.503134 < 01 13 04 03 0C 00 01 
2011-06-09 09:36:28.505069 > 04 0F 04 00 01 13 04 
2011-06-09 09:36:28.533086 > 04 08 04 00 0C 00 01 
2011-06-09 09:36:28.533133 < 02 0C 00 0A 00 06 00 01 00 0A 01 02 00 02 00 
2011-06-09 09:36:28.539338 > 02 0C 20 10 00 0C 00 01 00 0B 01 08 00 02 00 00 00 00 00 00 
  00 
2011-06-09 09:36:28.672083 > 04 13 05 01 0C 00 01 00 
2011-06-09 09:36:36.509207 > 04 05 04 00 0C 00 13 

-- 
keith.packard@...el.com

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