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Bluetooth: Allow re-encryption with LTK when STK is in use 

If we're encrypted with the STK we should allow re-encryption with an
LTK even though the achieved security level is the same. This patch adds
the necessary logic to the smp_sufficient_security function which is
used to determine whether to proceed with encryption or not.

Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
This commit is contained in:
Johan Hedberg 2014-07-01 19:14:13 +03:00 committed by Marcel Holtmann
parent fe59a05f94
commit 9ab65d60c2
1 changed files with 8 additions and 0 deletions
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8
net/bluetooth/smp.c
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@ -868,6 +868,14 @@ bool smp_sufficient_security(struct hci_conn *hcon, u8 sec_level)
if (sec_level == BT_SECURITY_LOW)
return true;
/* If we're encrypted with an STK always claim insufficient
* security. This way we allow the connection to be re-encrypted
* with an LTK, even if the LTK provides the same level of
* security.
*/
if (test_bit(HCI_CONN_STK_ENCRYPT, &hcon->flags))
return false;
if (hcon->sec_level >= sec_level)
return true;