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

/*
 * Copyright (C) 2021 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.assertNotNull;
import static org.junit.Assert.assertNull;
import static org.junit.Assume.assumeNoException;

import android.content.ActivityNotFoundException;
import android.content.Context;
import android.content.Intent;
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.Before;
import org.junit.Test;
import org.junit.runner.RunWith;

import java.io.IOException;
import java.util.regex.Pattern;

@RunWith(AndroidJUnit4.class)
public class DeviceTest {
    private static final String TEST_PKG = "android.security.cts.cve_2021_0954";
    private static final String TEST_VULNERABLE_PKG = "android";
    private static final String TEST_VULNERABLE_ACTIVITY =
            "com.android.internal.app.ResolverActivity";
    private static final int LAUNCH_TIMEOUT_MS = 20000;
    private static final String vulnerableActivityName = "ResolverActivity";
    private UiDevice mDevice;
    String activityDump = "";

    private void startOverlayService() {
        Context context = getApplicationContext();
        assertNotNull(context);
        Intent intent = new Intent(context, PocService.class);
        assertNotNull(intent);

        if (Settings.canDrawOverlays(getApplicationContext())) {
            context.startService(intent);
        } else {
            try {
                context.startService(intent);
            } catch (Exception e) {
                throw new RuntimeException("Unable to start the overlay service", e);
            }
        }
    }

    public void startVulnerableActivity() {
        Context context = getApplicationContext();
        Intent intent = new Intent();
        intent.setClassName(TEST_VULNERABLE_PKG, TEST_VULNERABLE_ACTIVITY);
        intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
        try {
            context.startActivity(intent);
        } catch (ActivityNotFoundException e) {
            assumeNoException("Activity not found on device", e);
        }
    }

    @Before
    public void setUp() throws Exception {
        mDevice = UiDevice.getInstance(getInstrumentation());

        /* Start the vulnerable activity */
        startVulnerableActivity();
        if (!mDevice.wait(Until.hasObject(By.res("android:id/contentPanel")
                .clazz("android.widget.ScrollView").pkg("android")), LAUNCH_TIMEOUT_MS)) {
            return;
        }

        /* Start the overlay service */
        startOverlayService();
    }

    @Test
    public void testVulnerableActivityPresence() {
        Pattern overlayTextPattern = Pattern.compile("OverlayButton", Pattern.CASE_INSENSITIVE);
        if (!mDevice.wait(Until.hasObject(By.text(overlayTextPattern)), LAUNCH_TIMEOUT_MS)) {
            return;
        }

        /*
         * Check if the currently running activity is the vulnerable activity, if not abort the test
         */
        try {
            activityDump = mDevice.executeShellCommand("dumpsys activity");
        } catch (IOException e) {
            throw new RuntimeException("Could not execute dumpsys activity command");
        }
        Pattern activityPattern =
                Pattern.compile("mResumedActivity.*" + vulnerableActivityName + ".*\n");
        if (!activityPattern.matcher(activityDump).find()) {
            return;
        }
        String message = "Device is vulnerable to b/143559931 hence any app with "
                + "SYSTEM_ALERT_WINDOW can overlay the ResolverActivity screen";
        assertNull(message, mDevice.findObject(By.text(overlayTextPattern)));
    }
}