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Bluetooth: Fix rejecting pairing in case of insufficient capabilities

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If we need an MITM protected connection but the local and remote IO
capabilities cannot provide it we should reject the pairing attempt in
the appropriate way. This patch adds the missing checks for such a
situation to the smp_cmd_pairing_req() and smp_cmd_pairing_rsp()
functions.

Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
This commit is contained in:
Johan Hedberg 2014-06-17 13:07:39 +03:00 committed by Marcel Holtmann
parent 581370cc74
commit 2ed8f65ca2
1 changed files with 20 additions and 0 deletions
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20
net/bluetooth/smp.c
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@ -706,6 +706,16 @@ static u8 smp_cmd_pairing_req(struct l2cap_conn *conn, struct sk_buff *skb)
if (sec_level > conn->hcon->pending_sec_level)
conn->hcon->pending_sec_level = sec_level;
/* If we need MITM check that it can be acheived */
if (conn->hcon->pending_sec_level >= BT_SECURITY_HIGH) {
u8 method;
method = get_auth_method(smp, conn->hcon->io_capability,
req->io_capability);
if (method == JUST_WORKS || method == JUST_CFM)
return SMP_AUTH_REQUIREMENTS;
}
build_pairing_cmd(conn, req, &rsp, auth);
key_size = min(req->max_key_size, rsp.max_key_size);
@ -752,6 +762,16 @@ static u8 smp_cmd_pairing_rsp(struct l2cap_conn *conn, struct sk_buff *skb)
if (check_enc_key_size(conn, key_size))
return SMP_ENC_KEY_SIZE;
/* If we need MITM check that it can be acheived */
if (conn->hcon->pending_sec_level >= BT_SECURITY_HIGH) {
u8 method;
method = get_auth_method(smp, req->io_capability,
rsp->io_capability);
if (method == JUST_WORKS || method == JUST_CFM)
return SMP_AUTH_REQUIREMENTS;
}
get_random_bytes(smp->prnd, sizeof(smp->prnd));
smp->prsp[0] = SMP_CMD_PAIRING_RSP;