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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 java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import android.content.pm.PackageManager;
import android.test.AndroidTestCase;
import java.security.KeyStore;
import java.security.KeyStoreException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.security.cert.Certificate;
import java.security.cert.CertificateEncodingException;
import java.security.cert.CertificateException;
import java.security.cert.CertificateFactory;
import java.security.cert.X509Certificate;
import java.util.Arrays;
import java.util.Collections;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
public class CertificateTest extends AndroidTestCase {
// The directory for CA root certificates trusted by WFA (WiFi Alliance)
static final String DIR_OF_CACERTS_FOR_WFA = "/etc/security/cacerts_wfa";
public void testNoRemovedCertificates() throws Exception {
Set<String> expectedCertificates = new HashSet<String>(
Arrays.asList(CertificateData.CERTIFICATE_DATA));
Set<String> deviceCertificates = getDeviceCertificates();
expectedCertificates.removeAll(deviceCertificates);
assertEquals("Missing CA certificates", Collections.EMPTY_SET, expectedCertificates);
}
/**
* If you fail CTS as a result of adding a root CA that is not part of the Android root CA
* store, please see the following.
*
* <p>This test exists because adding root CAs to a device has a very significant security
* impact. Whoever has access to the signing keys of that CA can compromise secure network
* traffic from affected Android devices, putting users at risk.
*
* <p>If you have a CA certificate which needs to be trusted by a particular app/service,
* ask the developer of the app/service to modify it to trust this CA (e.g., using Network
* Security Config feature). This avoids compromising the security of network traffic of other
* apps on the device.
*
* <p>If you have a CA certificate that you believe should be present on all Android devices,
* please file a public bug at https://code.google.com/p/android/issues/entry.
*
* <p>For questions, comments, and code reviews please contact security@android.com.
*/
public void testNoAddedCertificates() throws Exception {
Set<String> expectedCertificates = new HashSet<String>(
Arrays.asList(CertificateData.CERTIFICATE_DATA));
Set<String> deviceCertificates = getDeviceCertificates();
deviceCertificates.removeAll(expectedCertificates);
assertEquals("Unknown CA certificates", Collections.EMPTY_SET, deviceCertificates);
}
public void testBlockCertificates() throws Exception {
Set<String> blockCertificates = new HashSet<String>();
blockCertificates.add("C0:60:ED:44:CB:D8:81:BD:0E:F8:6C:0B:A2:87:DD:CF:81:67:47:8C");
Set<String> deviceCertificates = getDeviceCertificates();
deviceCertificates.retainAll(blockCertificates);
assertEquals("Blocked CA certificates", Collections.EMPTY_SET, deviceCertificates);
}
/**
* This test exists because adding new ca certificate or removing the ca certificates trusted by
* WFA (WiFi Alliance) is not allowed.
*
* For questions, comments, and code reviews please contact security@android.com.
*/
public void testNoRemovedWfaCertificates() throws Exception {
if (!supportPasspoint()) {
return;
}
Set<String> expectedCertificates = new HashSet<>(
Arrays.asList(CertificateData.WFA_CERTIFICATE_DATA));
Set<String> deviceWfaCertificates = getDeviceWfaCertificates();
expectedCertificates.removeAll(deviceWfaCertificates);
assertEquals("Missing WFA CA certificates", Collections.EMPTY_SET, expectedCertificates);
}
public void testNoAddedWfaCertificates() throws Exception {
if (!supportPasspoint()) {
return;
}
Set<String> expectedCertificates = new HashSet<String>(
Arrays.asList(CertificateData.WFA_CERTIFICATE_DATA));
Set<String> deviceWfaCertificates = getDeviceWfaCertificates();
deviceWfaCertificates.removeAll(expectedCertificates);
assertEquals("Unknown WFA CA certificates", Collections.EMPTY_SET, deviceWfaCertificates);
}
private boolean supportPasspoint() {
return mContext.getPackageManager().hasSystemFeature(PackageManager.FEATURE_WIFI_PASSPOINT);
}
private KeyStore createWfaKeyStore(String dirPath) throws CertificateException, IOException,
KeyStoreException, NoSuchAlgorithmException {
KeyStore keyStore = KeyStore.getInstance(KeyStore.getDefaultType());
keyStore.load(null, null);
String wfaCertsDir = System.getenv("ANDROID_ROOT") + dirPath;
int index = 0;
for (X509Certificate cert : loadCertsFromDisk(wfaCertsDir)) {
keyStore.setCertificateEntry(String.format("%d", index++), cert);
}
return keyStore;
}
private Set<X509Certificate> loadCertsFromDisk(String directory) throws CertificateException,
IOException {
Set<X509Certificate> certs = new HashSet<>();
File certDir = new File(directory);
File[] certFiles = certDir.listFiles();
if (certFiles == null || certFiles.length <= 0) {
return certs;
}
CertificateFactory certFactory = CertificateFactory.getInstance("X.509");
for (File certFile : certFiles) {
FileInputStream fis = new FileInputStream(certFile);
Certificate cert = certFactory.generateCertificate(fis);
if (cert instanceof X509Certificate) {
certs.add((X509Certificate) cert);
}
fis.close();
}
return certs;
}
private Set<String> getDeviceWfaCertificates() throws KeyStoreException,
NoSuchAlgorithmException, CertificateException, IOException {
KeyStore wfaKeyStore = createWfaKeyStore(DIR_OF_CACERTS_FOR_WFA);
List<String> aliases = Collections.list(wfaKeyStore.aliases());
assertFalse(aliases.isEmpty());
Set<String> certificates = new HashSet<>();
for (String alias : aliases) {
assertTrue(wfaKeyStore.isCertificateEntry(alias));
X509Certificate certificate = (X509Certificate) wfaKeyStore.getCertificate(alias);
assertEquals(certificate.getSubjectUniqueID(), certificate.getIssuerUniqueID());
assertNotNull(certificate.getSubjectDN());
assertNotNull(certificate.getIssuerDN());
String fingerprint = getFingerprint(certificate);
certificates.add(fingerprint);
}
return certificates;
}
private Set<String> getDeviceCertificates() throws KeyStoreException,
NoSuchAlgorithmException, CertificateException, IOException {
KeyStore keyStore = KeyStore.getInstance("AndroidCAStore");
keyStore.load(null, null);
List<String> aliases = Collections.list(keyStore.aliases());
assertFalse(aliases.isEmpty());
Set<String> certificates = new HashSet<String>();
for (String alias : aliases) {
assertTrue(keyStore.isCertificateEntry(alias));
X509Certificate certificate = (X509Certificate) keyStore.getCertificate(alias);
assertEquals(certificate.getSubjectUniqueID(), certificate.getIssuerUniqueID());
assertNotNull(certificate.getSubjectDN());
assertNotNull(certificate.getIssuerDN());
String fingerprint = getFingerprint(certificate);
certificates.add(fingerprint);
}
return certificates;
}
private String getFingerprint(X509Certificate certificate) throws CertificateEncodingException,
NoSuchAlgorithmException {
MessageDigest messageDigest = MessageDigest.getInstance("SHA1");
messageDigest.update(certificate.getEncoded());
byte[] sha1 = messageDigest.digest();
return convertToHexFingerprint(sha1);
}
private String convertToHexFingerprint(byte[] sha1) {
StringBuilder fingerprint = new StringBuilder();
for (int i = 0; i < sha1.length; i++) {
fingerprint.append(String.format("%02X", sha1[i]));
if (i + 1 < sha1.length) {
fingerprint.append(":");
}
}
return fingerprint.toString();
}
}
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