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Bluetooth: Enforce strict Secure Connections Only mode security

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In Secure Connections Only mode, it is required that Secure Connections
is used for pairing and that the link key is encrypted with AES-CCM using
a P-256 authenticated combination key. If this is not the case, then new
connection shall be refused or existing connections shall be dropped.

Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>
This commit is contained in:
Marcel Holtmann 2014-03-19 14:10:25 -07:00 committed by Johan Hedberg
parent 4e7b2030c4
commit 40b552aa5a
2 changed files with 23 additions and 0 deletions
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11
net/bluetooth/hci_conn.c
View File

@ -781,6 +781,17 @@ int hci_conn_check_link_mode(struct hci_conn *conn)
{
BT_DBG("hcon %p", conn);
/* In Secure Connections Only mode, it is required that Secure
* Connections is used and the link is encrypted with AES-CCM
* using a P-256 authenticated combination key.
*/
if (test_bit(HCI_SC_ONLY, &conn->hdev->flags)) {
if (!hci_conn_sc_enabled(conn) ||
!test_bit(HCI_CONN_AES_CCM, &conn->flags) ||
conn->key_type != HCI_LK_AUTH_COMBINATION_P256)
return 0;
}
if (hci_conn_ssp_enabled(conn) && !(conn->link_mode & HCI_LM_ENCRYPT))
return 0;

12
net/bluetooth/hci_event.c
View File

@ -2183,6 +2183,18 @@ static void hci_encrypt_change_evt(struct hci_dev *hdev, struct sk_buff *skb)
if (!ev->status)
conn->state = BT_CONNECTED;
/* In Secure Connections Only mode, do not allow any
* connections that are not encrypted with AES-CCM
* using a P-256 authenticated combination key.
*/
if (test_bit(HCI_SC_ONLY, &hdev->dev_flags) &&
(!test_bit(HCI_CONN_AES_CCM, &conn->flags) ||
conn->key_type != HCI_LK_AUTH_COMBINATION_P256)) {
hci_proto_connect_cfm(conn, HCI_ERROR_AUTH_FAILURE);
hci_conn_drop(conn);
goto unlock;
}
hci_proto_connect_cfm(conn, ev->status);
hci_conn_drop(conn);
} else