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Bluetooth: Align minimum encryption key size for LE and BR/EDR connections

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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
This commit is contained in:
Marcel Holtmann 2019-04-24 22:19:17 +02:00 committed by Johan Hedberg
parent e668eb1e15
commit d5bb334a8e
2 changed files with 11 additions and 0 deletions
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3
include/net/bluetooth/hci_core.h
View File

@ -190,6 +190,9 @@ struct adv_info {
#define HCI_MAX_SHORT_NAME_LENGTH 10 #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 */ /* Default LE RPA expiry time, 15 minutes */
#define HCI_DEFAULT_RPA_TIMEOUT (15 * 60) #define HCI_DEFAULT_RPA_TIMEOUT (15 * 60)

8
net/bluetooth/hci_conn.c
View File

@ -1276,6 +1276,14 @@ int hci_conn_check_link_mode(struct hci_conn *conn)
!test_bit(HCI_CONN_ENCRYPT, &conn->flags)) !test_bit(HCI_CONN_ENCRYPT, &conn->flags))
return 0; 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; return 1;
} }