Bluetooth: Add User Passkey Response handling

For some MITM protection pairing scenarios, the user is
required to enter or accept a 6 digit passkey.

Signed-off-by: Brian Gix <bgix@codeaurora.org>
Signed-off-by: Gustavo F. Padovan <padovan@profusion.mobi>

1 files changed, 73 insertions, 1 deletions

diff --git a/net/bluetooth/mgmt.c b/net/bluetooth/mgmt.c
index c06a05c09a95..7a23f211d602 100644
--- a/net/bluetooth/mgmt.c
+++ b/net/bluetooth/mgmt.c
@@ -1618,7 +1618,15 @@ static int user_pairing_resp(struct sock *sk, u16 index, bdaddr_t *bdaddr,
         }
 
         /* Continue with pairing via HCI */
-        err = hci_send_cmd(hdev, hci_op, sizeof(*bdaddr), bdaddr);
+        if (hci_op == HCI_OP_USER_PASSKEY_REPLY) {
+                struct hci_cp_user_passkey_reply cp;
+
+                bacpy(&cp.bdaddr, bdaddr);
+                cp.passkey = passkey;
+                err = hci_send_cmd(hdev, hci_op, sizeof(cp), &cp);
+        } else
+                err = hci_send_cmd(hdev, hci_op, sizeof(*bdaddr), bdaddr);
+
         if (err < 0)
                 mgmt_pending_remove(cmd);
 
@@ -1660,6 +1668,37 @@ static int user_confirm_neg_reply(struct sock *sk, u16 index, void *data,
                         HCI_OP_USER_CONFIRM_NEG_REPLY, 0);
 }
 
+static int user_passkey_reply(struct sock *sk, u16 index, void *data, u16 len)
+{
+        struct mgmt_cp_user_passkey_reply *cp = (void *) data;
+
+        BT_DBG("");
+
+        if (len != sizeof(*cp))
+                return cmd_status(sk, index, MGMT_OP_USER_PASSKEY_REPLY,
+                                                                        EINVAL);
+
+        return user_pairing_resp(sk, index, &cp->bdaddr,
+                        MGMT_OP_USER_PASSKEY_REPLY,
+                        HCI_OP_USER_PASSKEY_REPLY, cp->passkey);
+}
+
+static int user_passkey_neg_reply(struct sock *sk, u16 index, void *data,
+                                                                        u16 len)
+{
+        struct mgmt_cp_user_passkey_neg_reply *cp = (void *) data;
+
+        BT_DBG("");
+
+        if (len != sizeof(*cp))
+                return cmd_status(sk, index, MGMT_OP_USER_PASSKEY_NEG_REPLY,
+                                                                        EINVAL);
+
+        return user_pairing_resp(sk, index, &cp->bdaddr,
+                        MGMT_OP_USER_PASSKEY_NEG_REPLY,
+                        HCI_OP_USER_PASSKEY_NEG_REPLY, 0);
+}
+
 static int set_local_name(struct sock *sk, u16 index, unsigned char *data,
                                                                 u16 len)
 {
@@ -2117,6 +2156,13 @@ int mgmt_control(struct sock *sk, struct msghdr *msg, size_t msglen)
                 err = user_confirm_neg_reply(sk, index, buf + sizeof(*hdr),
                                                                         len);
                 break;
+        case MGMT_OP_USER_PASSKEY_REPLY:
+                err = user_passkey_reply(sk, index, buf + sizeof(*hdr), len);
+                break;
+        case MGMT_OP_USER_PASSKEY_NEG_REPLY:
+                err = user_passkey_neg_reply(sk, index, buf + sizeof(*hdr),
+                                                                        len);
+                break;
         case MGMT_OP_SET_LOCAL_NAME:
                 err = set_local_name(sk, index, buf + sizeof(*hdr), len);
                 break;
@@ -2477,6 +2523,18 @@ int mgmt_user_confirm_request(struct hci_dev *hdev, bdaddr_t *bdaddr,
                                                                         NULL);
 }
 
+int mgmt_user_passkey_request(struct hci_dev *hdev, bdaddr_t *bdaddr)
+{
+        struct mgmt_ev_user_passkey_request ev;
+
+        BT_DBG("%s", hdev->name);
+
+        bacpy(&ev.bdaddr, bdaddr);
+
+        return mgmt_event(MGMT_EV_USER_PASSKEY_REQUEST, hdev, &ev, sizeof(ev),
+                                                                        NULL);
+}
+
 static int user_pairing_resp_complete(struct hci_dev *hdev, bdaddr_t *bdaddr,
                                                         u8 status, u8 opcode)
 {
@@ -2511,6 +2569,20 @@ int mgmt_user_confirm_neg_reply_complete(struct hci_dev *hdev,
                                         MGMT_OP_USER_CONFIRM_NEG_REPLY);
 }
 
+int mgmt_user_passkey_reply_complete(struct hci_dev *hdev, bdaddr_t *bdaddr,
+                                                                u8 status)
+{
+        return user_pairing_resp_complete(hdev, bdaddr, status,
+                                                MGMT_OP_USER_PASSKEY_REPLY);
+}
+
+int mgmt_user_passkey_neg_reply_complete(struct hci_dev *hdev,
+                                                bdaddr_t *bdaddr, u8 status)
+{
+        return user_pairing_resp_complete(hdev, bdaddr, status,
+                                        MGMT_OP_USER_PASSKEY_NEG_REPLY);
+}
+
 int mgmt_auth_failed(struct hci_dev *hdev, bdaddr_t *bdaddr, u8 status)
 {
         struct mgmt_ev_auth_failed ev;