hostsidetests/securitybulletin/test-apps/CVE-2021-0954/src/android/security/cts/CVE_2021_0954/DeviceTest.java

/*
 * Copyright (C) 2022 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 android.security.cts.CVE_2021_0954;

import static androidx.test.core.app.ApplicationProvider.getApplicationContext;
import static androidx.test.platform.app.InstrumentationRegistry.getInstrumentation;

import static org.junit.Assert.assertTrue;
import static org.junit.Assume.assumeNoException;
import static org.junit.Assume.assumeTrue;

import android.content.Context;
import android.content.Intent;
import android.content.SharedPreferences;
import android.content.SharedPreferences.OnSharedPreferenceChangeListener;
import android.content.pm.PackageManager;
import android.provider.Settings;

import androidx.test.runner.AndroidJUnit4;
import androidx.test.uiautomator.By;
import androidx.test.uiautomator.UiDevice;
import androidx.test.uiautomator.Until;

import org.junit.Test;
import org.junit.runner.RunWith;

import java.util.concurrent.Semaphore;
import java.util.concurrent.TimeUnit;
import java.util.regex.Pattern;

@RunWith(AndroidJUnit4.class)
public class DeviceTest {
    private Context mContext = getApplicationContext();
    private static final int TIMEOUT_MS = 10000;

    private boolean hasFeature(String feature) {
        return mContext.getPackageManager().hasSystemFeature(feature);
    }

    private boolean isAuto() {
        return hasFeature(PackageManager.FEATURE_AUTOMOTIVE);
    }

    String getStringRes(int key) {
        return mContext.getResources().getString(key);
    }

    String getStringResWithArg(int key, String arg) {
        return mContext.getResources().getString(key, arg);
    }

    int getIntegerRes(int key) {
        return mContext.getResources().getInteger(key);
    }

    @Test
    public void testOverlayButtonPresence() {
        try {
            UiDevice device = UiDevice.getInstance(getInstrumentation());

            /* Start the overlay service */
            assumeTrue(getStringRes(R.string.canNotDrawOverlaysMsg),
                    Settings.canDrawOverlays(mContext));
            Intent intent = new Intent(mContext, PocService.class);
            mContext.startService(intent);

            /* Wait for a result from overlay service */
            SharedPreferences sharedPrefs = mContext.getSharedPreferences(
                    getStringRes(R.string.sharedPreferences), Context.MODE_PRIVATE);
            final Semaphore preferenceChanged = new Semaphore(0);
            OnSharedPreferenceChangeListener listener = new OnSharedPreferenceChangeListener() {
                @Override
                public void onSharedPreferenceChanged(SharedPreferences sharedPreferences,
                        String key) {
                    if (key.equals(getStringRes(R.string.resultKey))) {
                        preferenceChanged.release();
                    }
                }
            };
            sharedPrefs.registerOnSharedPreferenceChangeListener(listener);
            assumeTrue(preferenceChanged.tryAcquire(TIMEOUT_MS, TimeUnit.MILLISECONDS));
            int result = sharedPrefs.getInt(getStringRes(R.string.resultKey),
                    getIntegerRes(R.integer.assumptionFailure));
            String message = sharedPrefs.getString(getStringRes(R.string.messageKey),
                    getStringRes(R.string.defaultSemaphoreMsg));
            assumeTrue(message, result != getIntegerRes(R.integer.assumptionFailure));

            /* Wait for the UI of overlay window to appear */
            Pattern overlayTextPattern = Pattern.compile(
                    mContext.getString(R.string.overlayButtonText), Pattern.CASE_INSENSITIVE);
            assumeTrue(mContext.getString(R.string.overlayUiScreenError),
                    device.wait(Until.hasObject(By.text(overlayTextPattern)), TIMEOUT_MS));

            /* Start the vulnerable activity */
            intent = new Intent();
            String vulActivity = getStringRes(R.string.vulClass);
            String vulPkg = getStringRes(R.string.vulPkg);
            if (isAuto()) {
                vulActivity = getStringRes(R.string.vulClassAuto);
                vulPkg = getStringRes(R.string.vulPkgAuto);
            }
            intent.setClassName(vulPkg, vulActivity);
            intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
            mContext.startActivity(intent);

            /* Wait until the object of overlay window is gone */
            boolean overlayDisallowed =
                    device.wait(Until.gone(By.pkg(mContext.getPackageName())), TIMEOUT_MS);

            /*
             * Check if the currently running activity is the vulnerable activity, if not abort the
             * test
             */
            String activityDump = device.executeShellCommand(
                    getStringResWithArg(R.string.cmdDumpsysActivity, vulActivity));
            Pattern activityPattern = Pattern.compile(getStringRes(R.string.mResumedTrue));
            assumeTrue(getStringRes(R.string.vulActivityNotRunningError),
                    activityPattern.matcher(activityDump).find());

            /* Failing the test as fix is not present */
            assertTrue(getStringResWithArg(R.string.overlayErrorMessage, vulActivity),
                    overlayDisallowed);
        } catch (Exception e) {
            assumeNoException(e);
        }
    }
}