Allow the NFC process to call Bluetooth APIs.

The NFC process used to be only running as user 0,
and it may be calling into Bluetooth. Most of the
handover code has now moved to a separate process
running as the current user.

Fix the existing checks to take into account the
correct NFC UID, whatever user it is running as.

Bug: 7309141
Change-Id: I953cfb263a28aef7fe1be5880b053425dc359a29

Author: Martijn Coenen

services/java/com/android/server/BluetoothManagerService.java

@@ -43,8 +43,6 @@
 import android.os.UserHandle;
 import android.provider.Settings;
 import android.util.Log;
-import java.util.ArrayList;
-import java.util.List;
 class BluetoothManagerService extends IBluetoothManager.Stub {
     private static final String TAG = "BluetoothManagerService";
     private static final boolean DBG = true;
@@ -334,9 +332,12 @@ public boolean enableNoAutoConnect()
             Log.d(TAG,"enableNoAutoConnect():  mBluetooth =" + mBluetooth +
                     " mBinding = " + mBinding);
         }
-        if (Binder.getCallingUid() != Process.NFC_UID) {
+        int callingAppId = UserHandle.getAppId(Binder.getCallingUid());
+
+        if (callingAppId != Process.NFC_UID) {
             throw new SecurityException("no permission to enable Bluetooth quietly");
         }
+
         Message msg = mHandler.obtainMessage(MESSAGE_ENABLE);
         msg.arg1=0; //No persist
         msg.arg2=1; //Quiet mode
@@ -943,11 +944,14 @@ private void handleDisable(boolean persist) {
     private boolean checkIfCallerIsForegroundUser() {
         int foregroundUser;
         int callingUser = UserHandle.getCallingUserId();
+        int callingUid = Binder.getCallingUid();
         long callingIdentity = Binder.clearCallingIdentity();
+        int callingAppId = UserHandle.getAppId(callingUid);
         boolean valid = false;
         try {
             foregroundUser = ActivityManager.getCurrentUser();
-            valid = (callingUser == foregroundUser);
+            valid = (callingUser == foregroundUser) ||
+                    callingAppId == Process.NFC_UID;
             if (DBG) {
                 Log.d(TAG, "checkIfCallerIsForegroundUser: valid=" + valid
                     + " callingUser=" + callingUser