* [PATCH v1] Bluetooth: Double check sec req for pre 2.1 device
2011-05-05 14:16 [PATCH v1] Bluetooth: Double check sec req for pre 2.1 device Waldemar Rymarkiewicz
@ 2011-05-05 14:16 ` Waldemar Rymarkiewicz
2011-05-05 20:35 ` Gustavo F. Padovan
0 siblings, 1 reply; 3+ messages in thread
From: Waldemar Rymarkiewicz @ 2011-05-05 14:16 UTC (permalink / raw)
To: padovan, linux-bluetooth; +Cc: Waldemar Rymarkiewicz
In case of pre v2.1 devices authentication request will return
success immediately if the link key already exists without any
authentication process.
That means, it's not possible to re-authenticate the link if you
already have combination key and for instance want to re-authenticate
to get the high security (use 16 digit pin).
Therefore, it's necessary to check security requirements on auth
complete event to prevent not enough secure connection.
Signed-off-by: Waldemar Rymarkiewicz <waldemar.rymarkiewicz@tieto.com>
---
include/net/bluetooth/hci_core.h | 4 +++-
net/bluetooth/hci_conn.c | 17 +++++++++++++++++
net/bluetooth/rfcomm/core.c | 2 +-
3 files changed, 21 insertions(+), 2 deletions(-)
diff --git a/include/net/bluetooth/hci_core.h b/include/net/bluetooth/hci_core.h
index 14cc324..1b35c27 100644
--- a/include/net/bluetooth/hci_core.h
+++ b/include/net/bluetooth/hci_core.h
@@ -420,8 +420,10 @@ int hci_conn_del(struct hci_conn *conn);
void hci_conn_hash_flush(struct hci_dev *hdev);
void hci_conn_check_pending(struct hci_dev *hdev);
-struct hci_conn *hci_connect(struct hci_dev *hdev, int type, bdaddr_t *dst, __u8 sec_level, __u8 auth_type);
+struct hci_conn *hci_connect(struct hci_dev *hdev, int type, bdaddr_t *dst,
+ __u8 sec_level, __u8 auth_type);
int hci_conn_check_link_mode(struct hci_conn *conn);
+int hci_conn_check_secure(struct hci_conn *conn, __u8 sec_level);
int hci_conn_security(struct hci_conn *conn, __u8 sec_level, __u8 auth_type);
int hci_conn_change_link_key(struct hci_conn *conn);
int hci_conn_switch_role(struct hci_conn *conn, __u8 role);
diff --git a/net/bluetooth/hci_conn.c b/net/bluetooth/hci_conn.c
index 7f5ad8a..3163330 100644
--- a/net/bluetooth/hci_conn.c
+++ b/net/bluetooth/hci_conn.c
@@ -623,6 +623,23 @@ encrypt:
}
EXPORT_SYMBOL(hci_conn_security);
+/* Check secure link requirement */
+int hci_conn_check_secure(struct hci_conn *conn, __u8 sec_level)
+{
+ BT_DBG("conn %p", conn);
+
+ if (sec_level != BT_SECURITY_HIGH)
+ return 1; /* Accept if non-secure is required */
+
+ if (conn->key_type == HCI_LK_AUTH_COMBINATION ||
+ (conn->key_type == HCI_LK_COMBINATION &&
+ conn->pin_length == 16))
+ return 1;
+
+ return 0; /* Reject not secure link */
+}
+EXPORT_SYMBOL(hci_conn_check_secure);
+
/* Change link key */
int hci_conn_change_link_key(struct hci_conn *conn)
{
diff --git a/net/bluetooth/rfcomm/core.c b/net/bluetooth/rfcomm/core.c
index 121a5c1..5759bb7 100644
--- a/net/bluetooth/rfcomm/core.c
+++ b/net/bluetooth/rfcomm/core.c
@@ -2096,7 +2096,7 @@ static void rfcomm_security_cfm(struct hci_conn *conn, u8 status, u8 encrypt)
if (!test_and_clear_bit(RFCOMM_AUTH_PENDING, &d->flags))
continue;
- if (!status)
+ if (!status && hci_conn_check_secure(conn, d->sec_level))
set_bit(RFCOMM_AUTH_ACCEPT, &d->flags);
else
set_bit(RFCOMM_AUTH_REJECT, &d->flags);
--
1.7.1
^ permalink raw reply related [flat|nested] 3+ messages in thread