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SslCertificateTruster.java
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SslCertificateTruster.java
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/*
* Copyright 2015 the original author or authors.
*
* 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 io.pivotal.springcloud.ssl;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.security.KeyStore;
import java.security.KeyStoreException;
import java.security.NoSuchAlgorithmException;
import java.security.cert.CertificateException;
import java.security.cert.X509Certificate;
import java.util.UUID;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.Future;
import java.util.concurrent.ThreadFactory;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.TimeoutException;
import javax.net.ssl.SSLContext;
import javax.net.ssl.SSLSocket;
import javax.net.ssl.SSLSocketFactory;
import javax.net.ssl.TrustManager;
import javax.net.ssl.TrustManagerFactory;
import javax.net.ssl.X509TrustManager;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
*
* Utility for getting the JVM to trust an untrusted certificate
*
* @author wtran@pivotal.io
*
*/
public class SslCertificateTruster {
private static final Logger log = LoggerFactory.getLogger(SslCertificateTruster.class);
public static final String JAVAX_NET_SSL_TRUST_STORE_PASSWORD = "javax.net.ssl.trustStorePassword";
public static final String JAVAX_NET_SSL_TRUST_STORE = "javax.net.ssl.trustStore";
private final ExecutorService executor;
private SslCertificateTruster() {
executor = Executors.newFixedThreadPool(1, new ThreadFactory() {
@Override
public Thread newThread(Runnable r) {
return new Thread(r, "SSLCertificateTruster:downloader");
}
});
}
static final SslCertificateTruster instance = new SslCertificateTruster();
/**
* Performs an SSL handshake with the given host and port, and if the JVM
* does not trust the certificate presented during SSL handshake, return the
* certificate chain, otherwise return null.
*
* @param host
* @param port
* @param timeout
* socket timeout in milliseconds
* @return
* @throws Exception
* if the certificate chain could not be obtained during SSL
* handshake
*/
public static X509Certificate[] getUntrustedCertificate(String host, int port, int timeout) throws Exception {
return instance.getUntrustedCertificateInternal(host, port, timeout);
}
X509Certificate[] getUntrustedCertificateInternal(final String host, final int port, int timeout) throws Exception {
SSLContext context = SSLContext.getInstance("TLS");
X509TrustManager defaultTrustManager = getDefaultTrustManager();
CertificateCollectingTrustManager collector = new CertificateCollectingTrustManager(defaultTrustManager);
context.init(null, new TrustManager[] { collector }, null);
final SSLSocketFactory factory = context.getSocketFactory();
Future<?> task = executor.submit(new Runnable() {
@Override
public void run() {
try {
SSLSocket socket = (SSLSocket) factory.createSocket(host, port);
socket.startHandshake();
socket.close();
} catch (Exception e) {
log.error("Error downloading certificate {}:{}", host, port, e);
}
}
});
try {
task.get(timeout, TimeUnit.MILLISECONDS);
} catch (TimeoutException e) {
task.cancel(true);
throw e;
}
X509Certificate[] chain = collector.getCollectedCertificateChain();
if (chain == null) {
throw new CertificateException("Could not obtain server certificate chain");
} else if (collector.isTrusted()) {
return null;
}
return chain;
}
/**
* If the certificate at the specified host and port is untrusted, append
* the untrusted certificate to the JVM's currently used truststore. The
* change is made to a copy of the truststore, and the JVM can use the new
* copy via system property "javax.net.ssl.trustStore".
*
* @param host
* @param port
* @param timeout
* @throws Exception
*/
public static void trustCertificate(String host, int port, int timeout) throws Exception {
instance.trustCertificateInternal(host, port, timeout);
}
void trustCertificateInternal(String host, int port, int timeout) throws Exception {
X509Certificate[] untrusted = getUntrustedCertificate(host, port, timeout);
if (untrusted != null) {
appendToTruststore(untrusted);
}
}
/**
* Append the certificate to the JVM's currently used truststore. The change
* is made to a copy of the truststore, and the JVM can use the new copy via
* system property "javax.net.ssl.trustStore".
*
* @param chain
* @throws NoSuchAlgorithmException
* @throws KeyStoreException
* @throws IOException
* @throws CertificateException
* @throws FileNotFoundException
*/
public static void appendToTruststore(X509Certificate[] chain) throws NoSuchAlgorithmException, KeyStoreException,
IOException, CertificateException, FileNotFoundException {
instance.appendToTruststoreInternal(chain);
}
void appendToTruststoreInternal(X509Certificate[] chain) throws NoSuchAlgorithmException, KeyStoreException,
IOException, CertificateException, FileNotFoundException {
X509TrustManager defaultTrustManager = getDefaultTrustManager();
X509Certificate[] cacerts = defaultTrustManager.getAcceptedIssuers();
KeyStore trustStore = KeyStore.getInstance(KeyStore.getDefaultType());
trustStore.load(null); // init empty keystore
int count = 0;
for (X509Certificate cert : cacerts) {
trustStore.setCertificateEntry("" + count++, cert);
}
for (X509Certificate cert : chain) {
trustStore.setCertificateEntry("" + count++, cert);
}
String password = UUID.randomUUID().toString();
File trustStoreOutputFile = File.createTempFile("truststore", null);
trustStoreOutputFile.deleteOnExit();
trustStore.store(new FileOutputStream(trustStoreOutputFile), password.toCharArray());
System.setProperty(JAVAX_NET_SSL_TRUST_STORE, trustStoreOutputFile.getAbsolutePath());
System.setProperty(JAVAX_NET_SSL_TRUST_STORE_PASSWORD, password);
}
private static X509TrustManager getDefaultTrustManager() throws NoSuchAlgorithmException, KeyStoreException {
TrustManagerFactory trustManagerFactory =
TrustManagerFactory.getInstance(TrustManagerFactory.getDefaultAlgorithm());
// will initialize with the first valid keystore
// 1. javax.net.ssl.trustStore
// 2. jssecerts
// 3. cacerts
// see https://github.com/openjdk-mirror/jdk7u-jdk/blob/master/src/share/classes/sun/security/ssl/TrustManagerFactoryImpl.java#L130
trustManagerFactory.init((KeyStore) null);
X509TrustManager defaultTrustManager = (X509TrustManager) trustManagerFactory.getTrustManagers()[0];
return defaultTrustManager;
}
private static class CertificateCollectingTrustManager implements X509TrustManager {
private final X509TrustManager delegate;
private X509Certificate[] collected;
private Boolean trusted;
CertificateCollectingTrustManager(X509TrustManager delegate) {
this.delegate = delegate;
}
public X509Certificate[] getAcceptedIssuers() {
return delegate.getAcceptedIssuers();
}
public void checkClientTrusted(X509Certificate[] chain, String authType)
throws CertificateException {
if (collected != null) {
throw new IllegalStateException("A certificate chain has already been collected.");
} else {
collected = chain;
}
try {
delegate.checkClientTrusted(chain, authType);
trusted = true;
} catch (CertificateException e) {
trusted = false;
}
}
public void checkServerTrusted(X509Certificate[] chain, String authType)
throws CertificateException {
if (collected != null) {
throw new IllegalStateException("A certificate chain has already been collected.");
} else {
collected = chain;
}
try {
delegate.checkServerTrusted(chain, authType);
trusted = true;
} catch (CertificateException e) {
trusted = false;
}
}
private boolean isTrusted() {
if (trusted == null) {
throw new IllegalStateException("No certificates have been collected yet");
}
return trusted;
}
private X509Certificate[] getCollectedCertificateChain() {
return collected;
}
}
}