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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.security;
import javax.net.ssl.SSLEngine;
import javax.net.ssl.X509ExtendedKeyManager;
import java.net.Socket;
import java.security.KeyStore;
import java.security.Principal;
import java.security.PrivateKey;
import java.security.cert.X509Certificate;
import java.util.WeakHashMap;
/**
* A {@link X509ExtendedKeyManager} which can be updated with new certificate chain and private key while in use.
*
* The implementations assumes that aliases are retrieved from the same thread as the certificate chain and private key.
* This is case for OpenJDK 11.
*
* @author bjorncs
*/
public class MutableX509KeyManager extends X509ExtendedKeyManager {
private final Object monitor = new Object();
// Not using ThreadLocal as we want the thread local x509 key manager instances to be garbage collected
// when either the thread dies or the MutableX509KeyManager instance is collected (latter not the case for ThreadLocal).
private final WeakHashMap<Thread, X509ExtendedKeyManager> threadLocalManager = new WeakHashMap<>();
private X509ExtendedKeyManager currentManager;
public MutableX509KeyManager(KeyStore keystore, char[] password) {
synchronized (monitor) {
this.currentManager = KeyManagerUtils.createDefaultX509KeyManager(keystore, password);
}
}
public MutableX509KeyManager() {
synchronized (monitor) {
this.currentManager = KeyManagerUtils.createDefaultX509KeyManager();
}
}
public void updateKeystore(KeyStore keystore, char[] password) {
synchronized (monitor) {
this.currentManager = KeyManagerUtils.createDefaultX509KeyManager(keystore, password);
}
}
public void useDefaultKeystore() {
synchronized (monitor) {
this.currentManager = KeyManagerUtils.createDefaultX509KeyManager();
}
}
public X509ExtendedKeyManager currentManager() {
synchronized (monitor) {
return currentManager;
}
}
@Override
public String[] getServerAliases(String keyType, Principal[] issuers) {
return updateAndGetThreadLocalManager()
.getServerAliases(keyType, issuers);
}
@Override
public String[] getClientAliases(String keyType, Principal[] issuers) {
return updateAndGetThreadLocalManager()
.getClientAliases(keyType, issuers);
}
@Override
public String chooseServerAlias(String keyType, Principal[] issuers, Socket socket) {
return updateAndGetThreadLocalManager()
.chooseServerAlias(keyType, issuers, socket);
}
@Override
public String chooseClientAlias(String[] keyType, Principal[] issuers, Socket socket) {
return updateAndGetThreadLocalManager()
.chooseClientAlias(keyType, issuers, socket);
}
@Override
public String chooseEngineServerAlias(String keyType, Principal[] issuers, SSLEngine engine) {
return updateAndGetThreadLocalManager()
.chooseEngineServerAlias(keyType, issuers, engine);
}
@Override
public String chooseEngineClientAlias(String[] keyType, Principal[] issuers, SSLEngine engine) {
return updateAndGetThreadLocalManager()
.chooseEngineClientAlias(keyType, issuers, engine);
}
private X509ExtendedKeyManager updateAndGetThreadLocalManager() {
synchronized (monitor) {
X509ExtendedKeyManager currentManager = this.currentManager;
threadLocalManager.put(Thread.currentThread(), currentManager);
return currentManager;
}
}
@Override
public X509Certificate[] getCertificateChain(String alias) {
if (alias == null) return null; // this method can be called with 'null' alias prior to any alias getter methods.
return getThreadLocalManager()
.getCertificateChain(alias);
}
@Override
public PrivateKey getPrivateKey(String alias) {
if (alias == null) return null; // this method can be called with 'null' alias prior to any alias getter methods.
return getThreadLocalManager()
.getPrivateKey(alias);
}
private X509ExtendedKeyManager getThreadLocalManager() {
synchronized (monitor) {
X509ExtendedKeyManager manager = threadLocalManager.get(Thread.currentThread());
if (manager == null) {
throw new IllegalStateException("Methods to retrieve valid aliases has not been called previously from this thread");
}
return manager;
}
}
}
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