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Bluetooth: Don't enforce authentication for L2CAP PSM 1 and 3 

The recommendation for the L2CAP PSM 1 (SDP) is to not use any kind
of authentication or encryption. So don't trigger authentication
for incoming and outgoing SDP connections.

For L2CAP PSM 3 (RFCOMM) there is no clear requirement, but with
Bluetooth 2.1 the initiator is required to enable authentication
and encryption first and this gets enforced. So there is no need
to trigger an additional authentication step. The RFCOMM service
security will make sure that a secure enough link key is present.

When the encryption gets enabled after the SDP connection setup,
then switch the security level from SDP to low security.

Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
This commit is contained in:
Marcel Holtmann 2009-02-09 03:55:28 +01:00
parent 6a8d3010b3
commit 435fef20ac
2 changed files with 7 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
include/net/bluetooth/hci_core.h
View File

@ -597,6 +597,9 @@ static inline void hci_encrypt_cfm(struct hci_conn *conn, __u8 status, __u8 encr
{
struct list_head *p;
if (conn->sec_level == BT_SECURITY_SDP)
conn->sec_level = BT_SECURITY_LOW;
hci_proto_encrypt_cfm(conn, status, encrypt);
read_lock_bh(&hci_cb_list_lock);

5
net/bluetooth/l2cap.c
View File

@ -805,7 +805,7 @@ static int l2cap_sock_bind(struct socket *sock, struct sockaddr *addr, int addr_
l2cap_pi(sk)->sport = la->l2_psm;
sk->sk_state = BT_BOUND;
if (btohs(la->l2_psm) == 0x0001)
if (btohs(la->l2_psm) == 0x0001 || btohs(la->l2_psm) == 0x0003)
l2cap_pi(sk)->sec_level = BT_SECURITY_SDP;
}
@ -852,6 +852,9 @@ static int l2cap_do_connect(struct sock *sk)
auth_type = HCI_AT_NO_BONDING_MITM;
else
auth_type = HCI_AT_NO_BONDING;
if (l2cap_pi(sk)->sec_level == BT_SECURITY_LOW)
l2cap_pi(sk)->sec_level = BT_SECURITY_SDP;
} else {
switch (l2cap_pi(sk)->sec_level) {
case BT_SECURITY_HIGH: