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>

1 files changed, 8 insertions, 0 deletions

diff --git a/net/bluetooth/smp.c b/net/bluetooth/smp.c
index 68e6f245581c..55c41de2f5a0 100644
--- a/net/bluetooth/smp.c
+++ b/net/bluetooth/smp.c
@@ -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;