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/*
* Copyright (C) 2011 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;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;
import android.content.pm.PackageManager.NameNotFoundException;
import android.content.pm.Signature;
import android.content.res.Resources.NotFoundException;
import android.platform.test.annotations.RestrictedBuildTest;
import android.test.AndroidTestCase;
import android.util.Log;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.Arrays;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class PackageSignatureTest extends AndroidTestCase {
private static final String TAG = PackageSignatureTest.class.getSimpleName();
private static final Pattern TEST_PACKAGE_PATTERN = Pattern.compile("android\\.[^\\.]+\\.cts");
@RestrictedBuildTest
public void testPackageSignatures() throws Exception {
Set<String> badPackages = new HashSet<String>();
Set<Signature> wellKnownSignatures = getWellKnownSignatures();
PackageManager packageManager = mContext.getPackageManager();
List<PackageInfo> allPackageInfos = packageManager.getInstalledPackages(
PackageManager.GET_UNINSTALLED_PACKAGES |
PackageManager.GET_SIGNATURES |
PackageManager.MATCH_APEX);
for (PackageInfo packageInfo : allPackageInfos) {
String packageName = packageInfo.packageName;
Log.v(TAG, "Scanning " + packageName);
if (packageName != null && !isWhitelistedPackage(packageName)) {
for (Signature signature : packageInfo.signatures) {
if (wellKnownSignatures.contains(signature)) {
badPackages.add(packageInfo.packageName);
}
}
}
}
assertTrue("These packages should not be signed with a well known key: " + badPackages,
badPackages.isEmpty());
}
/**
* Returns the well-known dev-key signatures, e.g. to detect cases where devices under test are
* using modules that have been signed using dev keys; Google will supply modules that have been
* signed with production keys in all cases.
*
* <p>See {@link #writeSignature(String, String)} for instructions for how to create the raw
* .bin files when adding entries to this list.
*/
private Set<Signature> getWellKnownSignatures() throws NotFoundException, IOException {
Set<Signature> wellKnownSignatures = new HashSet<Signature>();
wellKnownSignatures.add(getSignature(R.raw.sig_media));
wellKnownSignatures.add(getSignature(R.raw.sig_platform));
wellKnownSignatures.add(getSignature(R.raw.sig_shared));
wellKnownSignatures.add(getSignature(R.raw.sig_testkey));
wellKnownSignatures.add(getSignature(R.raw.sig_debug));
wellKnownSignatures.add(getSignature(R.raw.sig_devkeys));
wellKnownSignatures.add(getSignature(R.raw.sig_networkstack));
wellKnownSignatures.add(getSignature(R.raw.sig_devkeys_media));
wellKnownSignatures.add(getSignature(R.raw.sig_devkeys_platform));
wellKnownSignatures.add(getSignature(R.raw.sig_devkeys_shared));
wellKnownSignatures.add(getSignature(R.raw.sig_devkeys_networkstack));
wellKnownSignatures.add(getSignature(R.raw.sig_com_android_conscrypt));
wellKnownSignatures.add(getSignature(R.raw.sig_com_android_media));
wellKnownSignatures.add(getSignature(R.raw.sig_com_android_media_swcodec));
wellKnownSignatures.add(getSignature(R.raw.sig_com_android_resolv));
wellKnownSignatures.add(getSignature(R.raw.sig_com_android_runtime_debug));
wellKnownSignatures.add(getSignature(R.raw.sig_com_android_runtime_release));
wellKnownSignatures.add(getSignature(R.raw.sig_com_android_tzdata));
wellKnownSignatures.add(getSignature(R.raw.sig_com_google_android_conscrypt));
wellKnownSignatures.add(getSignature(R.raw.sig_com_google_android_media));
wellKnownSignatures.add(getSignature(R.raw.sig_com_google_android_media_swcodec));
wellKnownSignatures.add(getSignature(R.raw.sig_com_google_android_resolv));
wellKnownSignatures.add(getSignature(R.raw.sig_com_google_android_runtime_debug));
wellKnownSignatures.add(getSignature(R.raw.sig_com_google_android_runtime_release));
wellKnownSignatures.add(getSignature(R.raw.sig_com_google_android_tzdata3));
// The following keys are not used by modules on the latest Android release, but it
// won't negatively affect tests to include their signatures here too.
wellKnownSignatures.add(getSignature(R.raw.sig_com_google_android_tzdata));
wellKnownSignatures.add(getSignature(R.raw.sig_com_google_android_tzdata2));
return wellKnownSignatures;
}
private static final Set<String> WHITELISTED_PACKAGES = new HashSet<String>(Arrays.asList(
// APKS are installed before beigning test
"android.netsecpolicy.usescleartext_false.cts",
"android.netsecpolicy.usescleartext_unspecified.cts",
"android.netsecpolicy.usescleartext_true.cts",
// The accessibility APK required to be installed while running CTS
"android.accessibilityservice.delegate",
// The device management APK required to be installed while running CTS
"android.deviceadmin.cts",
// APK for an activity that collects information printed in the CTS report header
"android.tests.devicesetup",
// Test utilities used by Tradefed harness
"com.android.tradefed.utils.wifi",
"android.tradefed.contentprovider",
"androidx.test.services",
// Game used for CTS testing...
"com.replica.replicaisland",
// CTS test
"android.core.tests.libcore.package.com",
"android.core.tests.libcore.package.conscrypt",
"android.core.tests.libcore.package.dalvik",
"android.core.tests.libcore.package.libcore",
"android.core.tests.libcore.package.org",
"android.core.tests.libcore.package.sun",
"android.core.tests.libcore.package.tests",
"com.android.cts.RemoteDPC",
"com.android.testutils.connectivitychecker",
// Test package to verify upgrades to privileged applications
"com.android.cts.priv.ctsshim",
"com.android.cts.ctsshim",
// Test APEX used in CTS tests.
"com.android.apex.cts.shim",
// Oom Catcher package to prevent tests from ooming device.
"com.android.cts.oomcatcher",
// Collects device info at the start of the test
"com.android.compatibility.common.deviceinfo"
));
private boolean isWhitelistedPackage(String packageName) {
// Don't check the signatures of CTS test packages on the device.
// devicesetup is the APK CTS loads to collect information needed in the final report
final Matcher matcher = TEST_PACKAGE_PATTERN.matcher(packageName);
return matcher.matches() || WHITELISTED_PACKAGES.contains(packageName);
}
private static final int DEFAULT_BUFFER_BYTES = 1024 * 4;
private Signature getSignature(int resId) throws NotFoundException, IOException {
InputStream input = mContext.getResources().openRawResource(resId);
ByteArrayOutputStream output = new ByteArrayOutputStream();
try {
byte[] buffer = new byte[DEFAULT_BUFFER_BYTES];
int numBytes = 0;
while ((numBytes = input.read(buffer)) != -1) {
output.write(buffer, 0, numBytes);
}
return new Signature(output.toByteArray());
} finally {
input.close();
output.close();
}
}
/**
* Writes a package's signature to a file on the device's external storage.
* This method was used to generate the well known signatures used by
* this test.
*
* As an alternative, you can use openssl to create the
* DER encoded certificate file.
*
* openssl x509 -in $ANDROID_HOME/build/target/product/security/media.x509.pem \
* -out sig_media.bin -outform DER
*/
@SuppressWarnings("unused")
private void writeSignature(String packageName, String fileName)
throws NameNotFoundException, IOException {
PackageManager packageManager = mContext.getPackageManager();
PackageInfo packageInfo = packageManager.getPackageInfo(packageName,
PackageManager.GET_SIGNATURES);
File directory = mContext.getExternalFilesDir(null);
int numSignatures = packageInfo.signatures.length;
Log.i(TAG, "Will dump " + numSignatures + " signatures to " + directory);
for (int i = 0; i < numSignatures; i++) {
Signature signature = packageInfo.signatures[i];
byte[] signatureBytes = signature.toByteArray();
File signatureFile = new File(directory, fileName + "." + i);
FileOutputStream output = null;
try {
output = new FileOutputStream(signatureFile);
output.write(signatureBytes);
} finally {
if (output != null) {
output.close();
}
}
}
}
}
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