/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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 org.apache.harmony.xnet.provider.jsse;
import org.bouncycastle.jce.provider.IndexedPKIXParameters;
import java.security.InvalidAlgorithmParameterException;
import java.security.KeyStore;
import java.security.KeyStoreException;
import java.security.cert.CertPathValidator;
import java.security.cert.CertPathValidatorException;
import java.security.cert.CertificateException;
import java.security.cert.CertificateFactory;
import java.security.cert.PKIXParameters;
import java.security.cert.TrustAnchor;
import java.security.cert.X509Certificate;
import java.util.Arrays;
import java.util.Enumeration;
import java.util.HashSet;
import java.util.Iterator;
import java.util.Set;
import javax.net.ssl.X509TrustManager;
// BEGIN android-added
import java.lang.reflect.Method;
import java.security.cert.CertPath;
import java.security.cert.CertificateEncodingException;
// END android-added
/**
*
* TrustManager implementation. The implementation is based on CertPathValidator
* PKIX and CertificateFactory X509 implementations. This implementations should
* be provided by some certification provider.
*
* @see javax.net.ssl.X509TrustManager
*/
public class TrustManagerImpl implements X509TrustManager {
private CertPathValidator validator;
private PKIXParameters params;
private Exception err = null;
private CertificateFactory factory;
/**
* Creates trust manager implementation
*
* @param ks
*/
public TrustManagerImpl(KeyStore ks) {
try {
validator = CertPathValidator.getInstance("PKIX");
factory = CertificateFactory.getInstance("X509");
byte[] nameConstrains = null;
Set<TrustAnchor> trusted = new HashSet<TrustAnchor>();
for (Enumeration<String> en = ks.aliases(); en.hasMoreElements();) {
final String alias = en.nextElement();
final X509Certificate cert = (X509Certificate) ks.getCertificate(alias);
if (cert != null) {
trusted.add(new TrustAnchor(cert, nameConstrains));
}
}
params = new PKIXParameters(trusted);
params.setRevocationEnabled(false);
} catch (Exception e) {
err = e;
}
}
// BEGIN android-added
/**
* Indexes trust anchors so they can be found in O(1) instead of O(N) time.
*/
public void indexTrustAnchors() throws CertificateEncodingException,
InvalidAlgorithmParameterException, KeyStoreException {
params = new IndexedPKIXParameters(params.getTrustAnchors());
params.setRevocationEnabled(false);
}
// END android-added
/**
* @see javax.net.ssl.X509TrustManager#checkClientTrusted(X509Certificate[],
* String)
*/
public void checkClientTrusted(X509Certificate[] chain, String authType)
throws CertificateException {
if (chain == null || chain.length == 0 || authType == null
|| authType.length() == 0) {
throw new IllegalArgumentException("null or zero-length parameter");
}
if (err != null) {
throw new CertificateException(err);
}
// BEGIN android-added
// Cater for degenerate special case where we can't
// establish an actual certificate chain the usual way,
// but have the peer certificate in our trust store.
if (isDirectlyTrustedCert(chain)) {
return;
}
// END android-added
try {
// BEGIN android-changed
CertPath certPath = factory.generateCertPath(Arrays.asList(chain));
if (!Arrays.equals(chain[0].getEncoded(),
((X509Certificate)certPath.getCertificates().get(0))
.getEncoded())) {
// sanity check failed (shouldn't ever happen, but we are using pretty remote code)
throw new CertificateException("Certificate chain error");
}
validator.validate(certPath, params);
// END android-changed
} catch (InvalidAlgorithmParameterException e) {
throw new CertificateException(e);
} catch (CertPathValidatorException e) {
throw new CertificateException(e);
}
}
/**
* @see javax.net.ssl.X509TrustManager#checkServerTrusted(X509Certificate[],
* String)
*/
public void checkServerTrusted(X509Certificate[] chain, String authType)
throws CertificateException {
if (chain == null || chain.length == 0 || authType == null
|| authType.length() == 0) {
throw new IllegalArgumentException(
"null or zero-length parameter");
}
if (err != null) {
throw new CertificateException(err);
}
// BEGIN android-changed
CertificateException ce = null;
try {
CertPath certPath = factory.generateCertPath(
Arrays.asList(chain));
if (!Arrays.equals(chain[0].getEncoded(),
certPath.getCertificates().get(0).getEncoded())) {
// Sanity check failed (shouldn't ever happen, but we are
// using pretty remote code)
throw new CertificateException("Certificate chain error");
}
validator.validate(certPath, params);
} catch (InvalidAlgorithmParameterException e) {
ce = new CertificateException(e);
} catch (CertPathValidatorException e) {
ce = new CertificateException(e);
}
if (ce != null) {
// Caters to degenerate special case where we can't
// establish an actual certificate chain the usual way
// but have the peer certificate in our trust store.
if (!isDirectlyTrustedCert(chain)) {
throw ce;
}
}
}
/**
* Checks whether the given chain is just a certificate
* that we have in our trust store.
*
* @param chain The certificate chain.
*
* @return True if the certificate is in our trust store, false otherwise.
*/
private boolean isDirectlyTrustedCert(X509Certificate[] chain) {
byte[] questionable;
if (chain.length == 1) {
if (params instanceof IndexedPKIXParameters) {
IndexedPKIXParameters index = (IndexedPKIXParameters) params;
return index.isDirectlyTrusted(chain[0]);
} else {
try {
questionable = chain[0].getEncoded();
Set<TrustAnchor> anchors = params.getTrustAnchors();
for (TrustAnchor trustAnchor : anchors) {
byte[] trusted = trustAnchor.getTrustedCert()
.getEncoded();
if (Arrays.equals(questionable, trusted)) {
return true;
}
}
} catch (CertificateEncodingException e) {
// Ignore.
}
}
}
return false;
}
// END android-changed
/**
* @see javax.net.ssl.X509TrustManager#getAcceptedIssuers()
*/
public X509Certificate[] getAcceptedIssuers() {
if (params == null) {
return new X509Certificate[0];
}
Set<TrustAnchor> anchors = params.getTrustAnchors();
X509Certificate[] certs = new X509Certificate[anchors.size()];
int i = 0;
for (Iterator<TrustAnchor> it = anchors.iterator(); it.hasNext();) {
certs[i++] = it.next().getTrustedCert();
}
return certs;
}
}