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Bluetooth: Fix redundant encryption when receiving Security Request 

If we're already encrypted with a good enough LTK we should just ignore
an incoming SMP Security Request. The code was already taking care of
this in the smp_conn_security function before calling smp_ltk_encrypt
but failed to do the same in smp_cmd_security_req. This patch fixes the
issue by moving up the smp_sufficient_security function and using it in
the Security Request handler before trying to request encryption.

Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
This commit is contained in:
Johan Hedberg 2014-07-01 18:40:20 +03:00 committed by Marcel Holtmann
parent c70a7e4cc8
commit 854f47278f
1 changed files with 14 additions and 11 deletions
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25
net/bluetooth/smp.c
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@ -859,6 +859,17 @@ static bool smp_ltk_encrypt(struct l2cap_conn *conn, u8 sec_level)
return true;
}
bool smp_sufficient_security(struct hci_conn *hcon, u8 sec_level)
{
if (sec_level == BT_SECURITY_LOW)
return true;
if (hcon->sec_level >= sec_level)
return true;
return false;
}
static u8 smp_cmd_security_req(struct l2cap_conn *conn, struct sk_buff *skb)
{
struct smp_cmd_security_req *rp = (void *) skb->data;
@ -876,6 +887,9 @@ static u8 smp_cmd_security_req(struct l2cap_conn *conn, struct sk_buff *skb)
return SMP_CMD_NOTSUPP;
sec_level = authreq_to_seclevel(rp->auth_req);
if (smp_sufficient_security(hcon, sec_level))
return 0;
if (sec_level > hcon->pending_sec_level)
hcon->pending_sec_level = sec_level;
@ -904,17 +918,6 @@ static u8 smp_cmd_security_req(struct l2cap_conn *conn, struct sk_buff *skb)
return 0;
}
bool smp_sufficient_security(struct hci_conn *hcon, u8 sec_level)
{
if (sec_level == BT_SECURITY_LOW)
return true;
if (hcon->sec_level >= sec_level)
return true;
return false;
}
int smp_conn_security(struct hci_conn *hcon, __u8 sec_level)
{
struct l2cap_conn *conn = hcon->l2cap_data;