From: Luiz Augusto von Dentz <luiz.dentz@gmail.com>
To: linux-bluetooth@vger.kernel.org
Subject: [PATCH 1/4] Bluetooth: Disconnect if E0 is used for Level 4
Date: Tue, 19 May 2020 13:25:16 -0700 [thread overview]
Message-ID: <20200519202519.219335-1-luiz.dentz@gmail.com> (raw)
From: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>
E0 is not allowed with Level 4:
BLUETOOTH CORE SPECIFICATION Version 5.2 | Vol 3, Part C page 1319:
'128-bit equivalent strength for link and encryption keys
required using FIPS approved algorithms (E0 not allowed,
SAFER+ not allowed, and P-192 not allowed; encryption key
not shortened'
SC enabled:
> HCI Event: Read Remote Extended Features (0x23) plen 13
Status: Success (0x00)
Handle: 256
Page: 1/2
Features: 0x0b 0x00 0x00 0x00 0x00 0x00 0x00 0x00
Secure Simple Pairing (Host Support)
LE Supported (Host)
Secure Connections (Host Support)
> HCI Event: Encryption Change (0x08) plen 4
Status: Success (0x00)
Handle: 256
Encryption: Enabled with AES-CCM (0x02)
SC disabled:
> HCI Event: Read Remote Extended Features (0x23) plen 13
Status: Success (0x00)
Handle: 256
Page: 1/2
Features: 0x03 0x00 0x00 0x00 0x00 0x00 0x00 0x00
Secure Simple Pairing (Host Support)
LE Supported (Host)
> HCI Event: Encryption Change (0x08) plen 4
Status: Success (0x00)
Handle: 256
Encryption: Enabled with E0 (0x01)
[May 8 20:23] Bluetooth: hci0: Invalid security: expect AES but E0 was used
< HCI Command: Disconnect (0x01|0x0006) plen 3
Handle: 256
Reason: Authentication Failure (0x05)
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>
---
net/bluetooth/hci_conn.c | 17 +++++++++++++++++
net/bluetooth/hci_event.c | 6 ++----
2 files changed, 19 insertions(+), 4 deletions(-)
diff --git a/net/bluetooth/hci_conn.c b/net/bluetooth/hci_conn.c
index 07c34c55fc50..0c1cae83c8dc 100644
--- a/net/bluetooth/hci_conn.c
+++ b/net/bluetooth/hci_conn.c
@@ -1325,6 +1325,23 @@ int hci_conn_check_link_mode(struct hci_conn *conn)
return 0;
}
+ /* AES encryption is required for Level 4:
+ *
+ * BLUETOOTH CORE SPECIFICATION Version 5.2 | Vol 3, Part C
+ * page 1319:
+ *
+ * 128-bit equivalent strength for link and encryption keys
+ * required using FIPS approved algorithms (E0 not allowed,
+ * SAFER+ not allowed, and P-192 not allowed; encryption key
+ * not shortened)
+ */
+ if (conn->sec_level == BT_SECURITY_FIPS &&
+ !test_bit(HCI_CONN_AES_CCM, &conn->flags)) {
+ bt_dev_err(conn->hdev, "Invalid security: expect AES but E0 "
+ "was used");
+ return 0;
+ }
+
if (hci_conn_ssp_enabled(conn) &&
!test_bit(HCI_CONN_ENCRYPT, &conn->flags))
return 0;
diff --git a/net/bluetooth/hci_event.c b/net/bluetooth/hci_event.c
index 006c24e04b44..dc1cc3c4348c 100644
--- a/net/bluetooth/hci_event.c
+++ b/net/bluetooth/hci_event.c
@@ -3078,10 +3078,8 @@ static void hci_encrypt_change_evt(struct hci_dev *hdev, struct sk_buff *skb)
* that are not encrypted with AES-CCM using a P-256 authenticated
* combination key.
*/
- if (hci_dev_test_flag(hdev, HCI_SC_ONLY) &&
- (!test_bit(HCI_CONN_AES_CCM, &conn->flags) ||
- conn->key_type != HCI_LK_AUTH_COMBINATION_P256)) {
- hci_connect_cfm(conn, HCI_ERROR_AUTH_FAILURE);
+ if (!hci_conn_check_link_mode(conn)) {
+ hci_disconnect(conn, HCI_ERROR_AUTH_FAILURE);
hci_conn_drop(conn);
goto unlock;
}
--
2.25.3
next reply other threads:[~2020-05-19 20:25 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-05-19 20:25 Luiz Augusto von Dentz [this message]
2020-05-19 20:25 ` [PATCH 2/4] Bluetooth: Fix assuming EIR flags can result in SSP authentication Luiz Augusto von Dentz
2020-05-20 14:34 ` Marcel Holtmann
2020-05-26 13:53 ` Alain Michaud
2020-05-26 14:17 ` Marcel Holtmann
2020-05-26 14:30 ` Alain Michaud
2020-05-28 8:22 ` Marcel Holtmann
2020-05-28 13:17 ` Alain Michaud
2020-05-28 16:53 ` Luiz Augusto von Dentz
2020-05-28 17:16 ` Alain Michaud
2020-06-03 18:02 ` Marcel Holtmann
2020-05-19 20:25 ` [PATCH 3/4] Bluetooth: Fix bogus check for re-auth no supported with non-ssp Luiz Augusto von Dentz
2020-05-20 14:25 ` Marcel Holtmann
2020-05-20 16:12 ` Luiz Augusto von Dentz
2020-05-19 20:25 ` [PATCH 4/4] Bluetooth: Consolidate encryption handling in hci_encrypt_cfm Luiz Augusto von Dentz
2020-05-20 14:31 ` Marcel Holtmann
2020-05-20 14:23 ` [PATCH 1/4] Bluetooth: Disconnect if E0 is used for Level 4 Marcel Holtmann
2020-05-20 16:00 ` Luiz Augusto von Dentz
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