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Bluetooth: Always request for user confirmation for Just Works

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To improve security, always give the user-space daemon a chance to
accept or reject a Just Works pairing (LE). The daemon may decide to
auto-accept based on the user's intent.

Signed-off-by: Sonny Sasaka <sonnysasaka@chromium.org>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
This commit is contained in:
Sonny Sasaka 2020-03-27 17:34:23 -07:00 committed by Marcel Holtmann
parent 3ee7b7cd83
commit 92516cd97f
1 changed files with 10 additions and 2 deletions
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12
net/bluetooth/smp.c
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@ -855,6 +855,7 @@ static int tk_request(struct l2cap_conn *conn, u8 remote_oob, u8 auth,
struct smp_chan *smp = chan->data;
u32 passkey = 0;
int ret = 0;
int err;
/* Initialize key for JUST WORKS */
memset(smp->tk, 0, sizeof(smp->tk));
@ -883,9 +884,16 @@ static int tk_request(struct l2cap_conn *conn, u8 remote_oob, u8 auth,
hcon->io_capability == HCI_IO_NO_INPUT_OUTPUT)
smp->method = JUST_WORKS;
/* If Just Works, Continue with Zero TK */
/* If Just Works, Continue with Zero TK and ask user-space for
* confirmation */
if (smp->method == JUST_WORKS) {
set_bit(SMP_FLAG_TK_VALID, &smp->flags);
err = mgmt_user_confirm_request(hcon->hdev, &hcon->dst,
hcon->type,
hcon->dst_type,
passkey, 1);
if (err)
return SMP_UNSPECIFIED;
set_bit(SMP_FLAG_WAIT_USER, &smp->flags);
return 0;
}