Commit Graph

22 Commits

Author SHA1 Message Date
Vinicius Costa Gomes 726b4ffcaa Bluetooth: Add support for storing the key size
In some cases it will be useful having the key size used for
encrypting the link. For example, some profiles may restrict
some operations depending on the key length.

The key size is stored in the key that is passed to userspace
using the pin_length field in the key structure.

For now this field is only valid for LE controllers. 3.0+HS
controllers define the Read Encryption Key Size command, this
field is intended for storing the value returned by that
command.

Signed-off-by: Vinicius Costa Gomes <vinicius.gomes@openbossa.org>
Signed-off-by: Gustavo F. Padovan <padovan@profusion.mobi>
2011-07-08 18:39:19 -03:00
Vinicius Costa Gomes 0eb08e3398 Bluetooth: Remove unused field in hci_conn
Signed-off-by: Vinicius Costa Gomes <vinicius.gomes@openbossa.org>
Signed-off-by: Gustavo F. Padovan <padovan@profusion.mobi>
2011-07-08 17:37:22 -03:00
Vinicius Costa Gomes 02bc74556a Bluetooth: Use the stored LTK for restabilishing security
Now that it's possible that the exchanged key is present in
the link key list, we may be able to estabilish security with
an already existing key, without need to perform any SMP
procedure.

Signed-off-by: Vinicius Costa Gomes <vinicius.gomes@openbossa.org>
Signed-off-by: Gustavo F. Padovan <padovan@profusion.mobi>
2011-07-08 17:37:18 -03:00
Vinicius Costa Gomes e7e62c8592 Bluetooth: Use the link key list to temporarily store the STK
With this we can use only one place to store all keys, without
need to use a field in the connection structure for this
purpose.

Signed-off-by: Vinicius Costa Gomes <vinicius.gomes@openbossa.org>
Signed-off-by: Gustavo F. Padovan <padovan@profusion.mobi>
2011-07-08 17:37:12 -03:00
Vinicius Costa Gomes 16b908396f Bluetooth: Add support for storing the LTK
Now when the LTK is received from the remote or generated it is stored,
so it can later be used.

Signed-off-by: Vinicius Costa Gomes <vinicius.gomes@openbossa.org>
Signed-off-by: Gustavo F. Padovan <padovan@profusion.mobi>
2011-07-08 17:37:07 -03:00
Vinicius Costa Gomes 54790f73a3 Bluetooth: Fix SM pairing parameters negotiation
Before implementing SM key distribution, the pairing features
exchange must be better negotiated, taking into account some
features of the host and connection requirements.

If we are in the "not pairable" state, it makes no sense to
exchange any key. This allows for simplification of the key
negociation method.

Signed-off-by: Vinicius Costa Gomes <vinicius.gomes@openbossa.org>
Signed-off-by: Gustavo F. Padovan <padovan@profusion.mobi>
2011-07-08 17:37:02 -03:00
Vinicius Costa Gomes 7034b911af Bluetooth: Add support for SMP phase 3 (key distribution)
This adds support for generating and distributing all the keys
specified in the third phase of SMP.

This will make possible to re-establish secure connections, resolve
private addresses and sign commands.

For now, the values generated are random.

Signed-off-by: Vinicius Costa Gomes <vinicius.gomes@openbossa.org>
Signed-off-by: Gustavo F. Padovan <padovan@profusion.mobi>
2011-07-08 17:07:43 -03:00
Andre Guedes 2e65c9d2c5 Bluetooth: Remove enable_smp parameter
The enable_smp parameter is no longer needed. It can be replaced by
checking lmp_host_le_capable.

Signed-off-by: Andre Guedes <andre.guedes@openbossa.org>
Signed-off-by: Gustavo F. Padovan <padovan@profusion.mobi>
2011-07-06 19:10:45 -03:00
Stephen Rothwell f70490e607 Bluetooth: include scatterlist.h where needed
net/bluetooth/smp.c: In function 'smp_e':
net/bluetooth/smp.c:49:21: error: storage size of 'sg' isn't known
net/bluetooth/smp.c:67:2: error: implicit declaration of function 'sg_init_one'
net/bluetooth/smp.c:49:21: warning: unused variable 'sg'

Caused by commit d22ef0bc83 ("Bluetooth: Add LE SMP Cryptoolbox
functions").  Missing include file, presumably.  This batch has been in
the bluetooth tree since June 14, so it may have been exposed by the
removal of linux/mm.h from netdevice.h ...

Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
2011-06-24 15:08:48 -04:00
Vinicius Costa Gomes 3158c50c33 Bluetooth: Add key size checks for SMP
This patch implements a check in smp cmd pairing request and pairing
response to verify if encryption key maximum size is compatible in both
slave and master when SMP Pairing is requested. Keys are also masked to
the correct negotiated size.

Signed-off-by: Vinicius Costa Gomes <vinicius.gomes@openbossa.org>
Signed-off-by: Anderson Briglia <anderson.briglia@openbossa.org>
Signed-off-by: Gustavo F. Padovan <padovan@profusion.mobi>
2011-06-14 14:54:10 -03:00
Vinicius Costa Gomes 5d3de7df18 Bluetooth: Add support for SMP timeout
This patch adds support for disconnecting the link when SMP procedure
takes more than 30 seconds.

SMP begins when either the Pairing Request command is sent or the
Pairing Response is received, and it ends when the link is encrypted
(or terminated). Vol 3, Part H Section 3.4.

Signed-off-by: Vinicius Costa Gomes <vinicius.gomes@openbossa.org>
Signed-off-by: Gustavo F. Padovan <padovan@profusion.mobi>
2011-06-14 14:54:05 -03:00
Vinicius Costa Gomes da85e5e5af Bluetooth: Add support for Pairing features exchange
This patch implements a simple version of the SMP Pairing Features
exchange procedure (Vol. 3 Part H, Section 2.3.5.1).

For now, everything that would cause a Pairing Method different of
Just Works to be chosen is rejected.

Signed-off-by: Vinicius Costa Gomes <vinicius.gomes@openbossa.org>
Signed-off-by: Gustavo F. Padovan <padovan@profusion.mobi>
2011-06-13 16:05:37 -03:00
Vinicius Costa Gomes b8e66eacab Bluetooth: Add support for building pairing commands
Before we are able to do a proper exchange of pairing parameters,
we need a unified way of building pairing requests and responses.

For IO Capability we use the value that was set by userspace,
using the management interface.

Signed-off-by: Vinicius Costa Gomes <vinicius.gomes@openbossa.org>
Signed-off-by: Gustavo F. Padovan <padovan@profusion.mobi>
2011-06-13 16:05:36 -03:00
Vinicius Costa Gomes f1cb9af557 Bluetooth: Add support for resuming socket when SMP is finished
This adds support for resuming the user space traffic when SMP
negotiation is complete.

Signed-off-by: Vinicius Costa Gomes <vinicius.gomes@openbossa.org>
Signed-off-by: Gustavo F. Padovan <padovan@profusion.mobi>
2011-06-13 16:05:34 -03:00
Vinicius Costa Gomes 9b3d67405b Bluetooth: Remove debug statements
Now that these commands are sent to the controller we can use hcidump
to verify that the correct values are produced.

Signed-off-by: Vinicius Costa Gomes <vinicius.gomes@openbossa.org>
Signed-off-by: Gustavo F. Padovan <padovan@profusion.mobi>
2011-06-13 15:48:26 -03:00
Vinicius Costa Gomes a7a595f675 Bluetooth: Add support for LE Start Encryption
This adds support for starting SMP Phase 2 Encryption, when the initial
SMP negotiation is successful. This adds the LE Start Encryption and LE
Long Term Key Request commands and related events.

Signed-off-by: Vinicius Costa Gomes <vinicius.gomes@openbossa.org>
Signed-off-by: Gustavo F. Padovan <padovan@profusion.mobi>
2011-06-13 15:48:25 -03:00
Anderson Briglia 7d24ddcc11 Bluetooth: Add SMP confirmation checks methods
This patch includes support for generating and sending the random value
used to produce the confirmation value.

Signed-off-by: Anderson Briglia <anderson.briglia@openbossa.org>
Signed-off-by: Vinicius Costa Gomes <vinicius.gomes@openbossa.org>
Signed-off-by: Gustavo F. Padovan <padovan@profusion.mobi>
2011-06-13 15:48:25 -03:00
Anderson Briglia f01ead3157 Bluetooth: Add SMP confirmation structs
This patch adds initial support for verifying the confirmation value
that the remote side has sent.

Signed-off-by: Anderson Briglia <anderson.briglia@openbossa.org>
Signed-off-by: Vinicius Costa Gomes <vinicius.gomes@openbossa.org>
Signed-off-by: Gustavo F. Padovan <padovan@profusion.mobi>
2011-06-13 15:48:24 -03:00
Anderson Briglia d22ef0bc83 Bluetooth: Add LE SMP Cryptoolbox functions
This patch implements SMP crypto functions called ah, c1, s1 and e.
It also implements auxiliary functions. All These functions are needed
for SMP keys generation.

Signed-off-by: Anderson Briglia <anderson.briglia@openbossa.org>
Signed-off-by: Anderson Lizardo <anderson.lizardo@openbossa.org>
Signed-off-by: Bruna Moreira <bruna.moreira@openbossa.org>
Signed-off-by: Vinicius Costa Gomes <vinicius.gomes@openbossa.org>
Signed-off-by: Gustavo F. Padovan <padovan@profusion.mobi>
2011-06-13 15:48:23 -03:00
Vinicius Costa Gomes 3a0259bb80 Bluetooth: Add support for using the crypto subsystem
This will allow using the crypto subsystem for encrypting data. As SMP
(Security Manager Protocol) is implemented almost entirely on the host
side and the crypto module already implements the needed methods
(AES-128), it makes sense to use it.

There's now a new module option to enable/disable SMP support.

Signed-off-by: Vinicius Costa Gomes <vinicius.gomes@openbossa.org>
Signed-off-by: Anderson Briglia <anderson.briglia@openbossa.org>
Signed-off-by: Gustavo F. Padovan <padovan@profusion.mobi>
2011-06-13 15:48:22 -03:00
Anderson Briglia 88ba43b662 Bluetooth: Add simple SMP pairing negotiation
This implementation only exchanges SMP messages between the Host and the
Remote. No keys are being generated. TK and STK generation will be
provided in further patches.

Signed-off-by: Vinicius Costa Gomes <vinicius.gomes@openbossa.org>
Signed-off-by: Gustavo F. Padovan <padovan@profusion.mobi>
2011-06-13 15:48:22 -03:00
Anderson Briglia eb492e0169 Bluetooth: Implement the first SMP commands
These simple commands will allow the SMP procedure to be started
and terminated with a not supported error. This is the first step
toward something useful.

Signed-off-by: Vinicius Costa Gomes <vinicius.gomes@openbossa.org>
Signed-off-by: Anderson Briglia <anderson.briglia@openbossa.org>
Signed-off-by: Gustavo F. Padovan <padovan@profusion.mobi>
2011-06-13 15:11:55 -03:00