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/*
* 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)));
}
}
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