diff options
author | Waldemar Rymarkiewicz <waldemar.rymarkiewicz@tieto.com> | 2011-04-28 12:07:55 +0200 |
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committer | Gustavo F. Padovan <padovan@profusion.mobi> | 2011-04-28 15:02:12 -0300 |
commit | 13d39315c22b128f4796fc008b04914a7c32bb1a (patch) | |
tree | 81f6ed817d6814ba2af5c0bf8a6b7ede9999a395 /net/bluetooth/hci_conn.c | |
parent | 9003c4e220c2954a53c5da0d739ed15a46c13429 (diff) |
Bluetooth: Map sec_level to link key requirements
Keep the link key type together with connection and use it to
map security level to link key requirements. Authenticate and/or
encrypt connection if the link is insufficiently secure.
Signed-off-by: Waldemar Rymarkiewicz <waldemar.rymarkiewicz@tieto.com>
Signed-off-by: Gustavo F. Padovan <padovan@profusion.mobi>
Diffstat (limited to 'net/bluetooth/hci_conn.c')
-rw-r--r-- | net/bluetooth/hci_conn.c | 61 |
1 files changed, 51 insertions, 10 deletions
diff --git a/net/bluetooth/hci_conn.c b/net/bluetooth/hci_conn.c index 7a6f56b2f49..74cd755b38a 100644 --- a/net/bluetooth/hci_conn.c +++ b/net/bluetooth/hci_conn.c @@ -287,6 +287,7 @@ struct hci_conn *hci_conn_add(struct hci_dev *hdev, int type, bdaddr_t *dst) conn->auth_type = HCI_AT_GENERAL_BONDING; conn->io_capability = hdev->io_capability; conn->remote_auth = 0xff; + conn->key_type = 0xff; conn->power_save = 1; conn->disc_timeout = HCI_DISCONN_TIMEOUT; @@ -535,32 +536,72 @@ static int hci_conn_auth(struct hci_conn *conn, __u8 sec_level, __u8 auth_type) return 0; } +/* Encrypt the the link */ +static void hci_conn_encrypt(struct hci_conn *conn) +{ + BT_DBG("conn %p", conn); + + if (!test_and_set_bit(HCI_CONN_ENCRYPT_PEND, &conn->pend)) { + struct hci_cp_set_conn_encrypt cp; + cp.handle = cpu_to_le16(conn->handle); + cp.encrypt = 0x01; + hci_send_cmd(conn->hdev, HCI_OP_SET_CONN_ENCRYPT, sizeof(cp), + &cp); + } +} + /* Enable security */ int hci_conn_security(struct hci_conn *conn, __u8 sec_level, __u8 auth_type) { BT_DBG("conn %p", conn); + /* For sdp we don't need the link key. */ if (sec_level == BT_SECURITY_SDP) return 1; + /* For non 2.1 devices and low security level we don't need the link + key. */ if (sec_level == BT_SECURITY_LOW && (!conn->ssp_mode || !conn->hdev->ssp_mode)) return 1; - if (conn->link_mode & HCI_LM_ENCRYPT) - return hci_conn_auth(conn, sec_level, auth_type); - + /* For other security levels we need the link key. */ + if (!(conn->link_mode & HCI_LM_AUTH)) + goto auth; + + /* An authenticated combination key has sufficient security for any + security level. */ + if (conn->key_type == HCI_LK_AUTH_COMBINATION) + goto encrypt; + + /* An unauthenticated combination key has sufficient security for + security level 1 and 2. */ + if (conn->key_type == HCI_LK_UNAUTH_COMBINATION && + (sec_level == BT_SECURITY_MEDIUM || + sec_level == BT_SECURITY_LOW)) + goto encrypt; + + /* A combination key has always sufficient security for the security + levels 1 or 2. High security level requires the combination key + is generated using maximum PIN code length (16). + For pre 2.1 units. */ + if (conn->key_type == HCI_LK_COMBINATION && + (sec_level != BT_SECURITY_HIGH || + conn->pin_length == 16)) + goto encrypt; + +auth: if (test_and_set_bit(HCI_CONN_ENCRYPT_PEND, &conn->pend)) return 0; - if (hci_conn_auth(conn, sec_level, auth_type)) { - struct hci_cp_set_conn_encrypt cp; - cp.handle = cpu_to_le16(conn->handle); - cp.encrypt = 1; - hci_send_cmd(conn->hdev, HCI_OP_SET_CONN_ENCRYPT, - sizeof(cp), &cp); - } + hci_conn_auth(conn, sec_level, auth_type); + return 0; + +encrypt: + if (conn->link_mode & HCI_LM_ENCRYPT) + return 1; + hci_conn_encrypt(conn); return 0; } EXPORT_SYMBOL(hci_conn_security); |