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authorMarcel Holtmann <marcel@holtmann.org>2019-04-24 22:19:17 +0200
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2019-06-25 11:36:01 +0800
commit5e9a6c68de0fd1ce37380e4947941bcd587d6b57 (patch)
tree963ab39cbca112816ffdef92318b342e55f5b89c
parent64e370233a0781aa0954ed4079e90d0bdb748b0e (diff)
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Bluetooth: Align minimum encryption key size for LE and BR/EDR connections
commit d5bb334a8e171b262e48f378bd2096c0ea458265 upstream. The minimum encryption key size for LE connections is 56 bits and to align LE with BR/EDR, enforce 56 bits of minimum encryption key size for BR/EDR connections as well. Signed-off-by: Marcel Holtmann <marcel@holtmann.org> Signed-off-by: Johan Hedberg <johan.hedberg@intel.com> Cc: stable@vger.kernel.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-rw-r--r--include/net/bluetooth/hci_core.h3
-rw-r--r--net/bluetooth/hci_conn.c8
2 files changed, 11 insertions, 0 deletions
diff --git a/include/net/bluetooth/hci_core.h b/include/net/bluetooth/hci_core.h
index 1dfb75057580..cc2d0c3b475b 100644
--- a/include/net/bluetooth/hci_core.h
+++ b/include/net/bluetooth/hci_core.h
@@ -182,6 +182,9 @@ struct adv_info {
#define HCI_MAX_SHORT_NAME_LENGTH 10
+/* Min encryption key size to match with SMP */
+#define HCI_MIN_ENC_KEY_SIZE 7
+
/* Default LE RPA expiry time, 15 minutes */
#define HCI_DEFAULT_RPA_TIMEOUT (15 * 60)
diff --git a/net/bluetooth/hci_conn.c b/net/bluetooth/hci_conn.c
index bd4978ce8c45..3cf0764d5793 100644
--- a/net/bluetooth/hci_conn.c
+++ b/net/bluetooth/hci_conn.c
@@ -1276,6 +1276,14 @@ int hci_conn_check_link_mode(struct hci_conn *conn)
!test_bit(HCI_CONN_ENCRYPT, &conn->flags))
return 0;
+ /* The minimum encryption key size needs to be enforced by the
+ * host stack before establishing any L2CAP connections. The
+ * specification in theory allows a minimum of 1, but to align
+ * BR/EDR and LE transports, a minimum of 7 is chosen.
+ */
+ if (conn->enc_key_size < HCI_MIN_ENC_KEY_SIZE)
+ return 0;
+
return 1;
}