Bluetooth: Use debug keys for SMP when HCI_USE_DEBUG_KEYS is set

The HCI_USE_DEBUG_KEYS flag is intended to force our side to always use
debug keys for pairing. This means both BR/EDR SSP as well as SMP with
LE Secure Connections. This patch updates the SMP code to use the debug
keys instead of generating a random local key pair when the flag is set.

Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>

1 files changed, 18 insertions, 9 deletions

diff --git a/net/bluetooth/smp.c b/net/bluetooth/smp.c
index 918ce036cb91..779160485a50 100644
--- a/net/bluetooth/smp.c
+++ b/net/bluetooth/smp.c
@@ -1585,18 +1585,27 @@ static u8 smp_cmd_pairing_req(struct l2cap_conn *conn, struct sk_buff *skb)
 
 static u8 sc_send_public_key(struct smp_chan *smp)
 {
+        struct hci_dev *hdev = smp->conn->hcon->hdev;
+
         BT_DBG("");
 
-        while (true) {
-                /* Generate local key pair for Secure Connections */
-                if (!ecc_make_key(smp->local_pk, smp->local_sk))
-                        return SMP_UNSPECIFIED;
+        if (test_bit(HCI_USE_DEBUG_KEYS, &hdev->dev_flags)) {
+                BT_DBG("Using debug keys");
+                memcpy(smp->local_pk, debug_pk, 64);
+                memcpy(smp->local_sk, debug_sk, 32);
+                set_bit(SMP_FLAG_DEBUG_KEY, &smp->flags);
+        } else {
+                while (true) {
+                        /* Generate local key pair for Secure Connections */
+                        if (!ecc_make_key(smp->local_pk, smp->local_sk))
+                                return SMP_UNSPECIFIED;
 
-                /* This is unlikely, but we need to check that we didn't
-                 * accidentially generate a debug key.
-                 */
-                if (memcmp(smp->local_sk, debug_sk, 32))
-                        break;
+                        /* This is unlikely, but we need to check that
+                         * we didn't accidentially generate a debug key.
+                         */
+                        if (memcmp(smp->local_sk, debug_sk, 32))
+                                break;
+                }
         }
 
         BT_DBG("Local Public Key X: %32phN", smp->local_pk);