Merge "Protect autofill UI against redressing" into oc-dev

am: 0541862ec5

Change-Id: I07b91f8baa721b58f7f0ff9bf90a29481fdedaac

services/autofill/java/com/android/server/autofill/ui/AutoFillUI.java

@@ -61,6 +61,8 @@ public final class AutoFillUI {
 
     private final MetricsLogger mMetricsLogger = new MetricsLogger();
 
+    private final @NonNull OverlayControl mOverlayControl;
+
     public interface AutoFillUiCallback {
         void authenticate(int requestId, int datasetIndex, @NonNull IntentSender intent,
                 @Nullable Bundle extras);
@@ -75,6 +77,7 @@ public final class AutoFillUI {
 
     public AutoFillUI(@NonNull Context context) {
         mContext = context;
+        mOverlayControl = new OverlayControl(context);
     }
 
     public void setCallback(@NonNull AutoFillUiCallback callback) {
@@ -174,7 +177,7 @@ public final class AutoFillUI {
             }
             hideAllUiThread(callback);
             mFillUi = new FillUi(mContext, response, focusedId,
-                    filterText, new FillUi.Callback() {
+                    filterText, mOverlayControl, new FillUi.Callback() {
                 @Override
                 public void onResponsePicked(FillResponse response) {
                     log.setType(MetricsProto.MetricsEvent.TYPE_DETAIL);
@@ -255,7 +258,7 @@ public final class AutoFillUI {
             }
             hideAllUiThread(callback);
             mSaveUi = new SaveUi(mContext, providerLabel, info,
-                    new SaveUi.OnSaveListener() {
+                    mOverlayControl, new SaveUi.OnSaveListener() {
                 @Override
                 public void onSave() {
                     log.setType(MetricsProto.MetricsEvent.TYPE_ACTION);

services/autofill/java/com/android/server/autofill/ui/FillUi.java

@@ -100,7 +100,7 @@ final class FillUi {
 
     FillUi(@NonNull Context context, @NonNull FillResponse response,
             @NonNull AutofillId focusedViewId, @NonNull @Nullable String filterText,
-            @NonNull Callback callback) {
+            @NonNull OverlayControl overlayControl, @NonNull Callback callback) {
         mContext = context;
         mCallback = callback;
 
@@ -146,7 +146,7 @@ final class FillUi {
             mContentWidth = content.getMeasuredWidth();
             mContentHeight = content.getMeasuredHeight();
 
-            mWindow = new AnchoredWindow(decor);
+            mWindow = new AnchoredWindow(decor, overlayControl);
             mCallback.requestShowFillUi(mContentWidth, mContentHeight, mWindowPresenter);
         } else {
             final int datasetCount = response.getDatasets().size();
@@ -193,7 +193,7 @@ final class FillUi {
             }
 
             applyNewFilterText();
-            mWindow = new AnchoredWindow(decor);
+            mWindow = new AnchoredWindow(decor, overlayControl);
         }
     }
 
@@ -366,6 +366,7 @@ final class FillUi {
     }
 
     final class AnchoredWindow implements View.OnTouchListener {
+        private final @NonNull OverlayControl mOverlayControl;
         private final WindowManager mWm;
         private final View mContentView;
         private boolean mShowing;
@@ -375,9 +376,10 @@ final class FillUi {
          *
          * @param contentView content of the window
          */
-        AnchoredWindow(View contentView) {
+        AnchoredWindow(View contentView, @NonNull OverlayControl overlayControl) {
             mWm = contentView.getContext().getSystemService(WindowManager.class);
             mContentView = contentView;
+            mOverlayControl = overlayControl;
         }
 
         /**
@@ -391,6 +393,7 @@ final class FillUi {
                             .getString(R.string.autofill_picker_accessibility_title);
                     mWm.addView(mContentView, params);
                     mContentView.setOnTouchListener(this);
+                    mOverlayControl.hideOverlays();
                     mShowing = true;
                 } else {
                     mWm.updateViewLayout(mContentView, params);
@@ -423,6 +426,8 @@ final class FillUi {
                 // does, it should not crash the system.
                 Slog.e(TAG, "Exception hiding window ", e);
                 mCallback.onDestroy();
+            } finally {
+                mOverlayControl.showOverlays();
             }
         }
 

services/autofill/java/com/android/server/autofill/ui/OverlayControl.java

@@ -0,0 +1,56 @@
+/*
+ * Copyright (C) 2017 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.server.autofill.ui;
+
+import android.annotation.NonNull;
+import android.app.AppOpsManager;
+import android.content.Context;
+import android.os.Binder;
+import android.os.IBinder;
+
+/**
+ * This class controls showing/hiding overlays. We don't
+ * hide all overlays (toast/system alerts) while sensitive
+ * autofill UI is up.
+ */
+class OverlayControl {
+
+    private final IBinder mToken = new Binder();
+
+    private final @NonNull AppOpsManager mAppOpsManager;
+
+    OverlayControl(@NonNull Context context) {
+        mAppOpsManager = context.getSystemService(AppOpsManager.class);
+    }
+
+    void hideOverlays() {
+        setOverlayAllowed(false);
+    }
+
+    void showOverlays() {
+        setOverlayAllowed(true);
+    }
+
+    private void setOverlayAllowed(boolean allowed) {
+        if (mAppOpsManager != null) {
+            mAppOpsManager.setUserRestriction(
+                    AppOpsManager.OP_SYSTEM_ALERT_WINDOW, !allowed, mToken);
+            mAppOpsManager.setUserRestriction(
+                    AppOpsManager.OP_TOAST_WINDOW, !allowed, mToken);
+        }
+    }
+}

services/autofill/java/com/android/server/autofill/ui/SaveUi.java

@@ -99,14 +99,17 @@ final class SaveUi {
 
     private final @NonNull OneTimeListener mListener;
 
+    private final @NonNull OverlayControl mOverlayControl;
+
     private final CharSequence mTitle;
     private final CharSequence mSubTitle;
 
     private boolean mDestroyed;
 
     SaveUi(@NonNull Context context, @NonNull CharSequence providerLabel, @NonNull SaveInfo info,
-            @NonNull OnSaveListener listener) {
+           @NonNull OverlayControl overlayControl, @NonNull OnSaveListener listener) {
         mListener = new OneTimeListener(listener);
+        mOverlayControl = overlayControl;
 
         final LayoutInflater inflater = LayoutInflater.from(context);
         final View view = inflater.inflate(R.layout.autofill_save, null);
@@ -197,9 +200,11 @@ final class SaveUi {
 
         Slog.i(TAG, "Showing save dialog: " + mTitle);
         mDialog.show();
+        mOverlayControl.hideOverlays();
     }
 
     void destroy() {
+        try {
             if (sDebug) Slog.d(TAG, "destroy()");
             throwIfDestroyed();
             mListener.onDestroy();
@@ -207,6 +212,9 @@ final class SaveUi {
             if (sVerbose) Slog.v(TAG, "destroy(): dismissing dialog");
             mDialog.dismiss();
             mDestroyed = true;
+        } finally {
+            mOverlayControl.showOverlays();
+        }
     }
 
     private void throwIfDestroyed() {