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Bluetooth: Use the LTK after receiving a LE Security Request

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When receiving a security request from the remote device we should find
if there is already a LTK associated with the remote device, if found
we should use it to encrypt the link.

Signed-off-by: Vinicius Costa Gomes <vinicius.gomes@openbossa.org>
Signed-off-by: Gustavo F. Padovan <padovan@profusion.mobi>
This commit is contained in:
Vinicius Costa Gomes 2011-08-25 20:02:28 -03:00 committed by Gustavo F. Padovan
parent 0fb4eb6f63
commit 988c5997d3
1 changed files with 28 additions and 18 deletions
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46
net/bluetooth/smp.c
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@ -499,6 +499,29 @@ static u8 smp_cmd_pairing_random(struct l2cap_conn *conn, struct sk_buff *skb)
return 0;
}
static u8 smp_ltk_encrypt(struct l2cap_conn *conn)
{
struct link_key *key;
struct key_master_id *master;
struct hci_conn *hcon = conn->hcon;
key = hci_find_link_key_type(hcon->hdev, conn->dst,
HCI_LK_SMP_LTK);
if (!key)
return 0;
if (test_and_set_bit(HCI_CONN_ENCRYPT_PEND,
&hcon->pend))
return 1;
master = (void *) key->data;
hci_le_start_enc(hcon, master->ediv, master->rand,
key->val);
hcon->enc_key_size = key->pin_len;
return 1;
}
static u8 smp_cmd_security_req(struct l2cap_conn *conn, struct sk_buff *skb)
{
struct smp_cmd_security_req *rp = (void *) skb->data;
@ -508,6 +531,9 @@ static u8 smp_cmd_security_req(struct l2cap_conn *conn, struct sk_buff *skb)
BT_DBG("conn %p", conn);
if (smp_ltk_encrypt(conn))
return 0;
if (test_and_set_bit(HCI_CONN_LE_SMP_PEND, &hcon->pend))
return 0;
@ -542,25 +568,9 @@ int smp_conn_security(struct l2cap_conn *conn, __u8 sec_level)
if (hcon->sec_level >= sec_level)
return 1;
if (hcon->link_mode & HCI_LM_MASTER) {
struct link_key *key;
key = hci_find_link_key_type(hcon->hdev, conn->dst,
HCI_LK_SMP_LTK);
if (key) {
struct key_master_id *master = (void *) key->data;
if (test_and_set_bit(HCI_CONN_ENCRYPT_PEND,
&hcon->pend))
goto done;
hci_le_start_enc(hcon, master->ediv, master->rand,
key->val);
hcon->enc_key_size = key->pin_len;
if (hcon->link_mode & HCI_LM_MASTER)
if (smp_ltk_encrypt(conn))
goto done;
}
}
if (test_and_set_bit(HCI_CONN_LE_SMP_PEND, &hcon->pend))
return 0;