absurdfarce commented on code in PR #1907: URL: https://github.com/apache/cassandra-java-driver/pull/1907#discussion_r1478784272
########## core/src/main/java/com/datastax/oss/driver/internal/core/ssl/ReloadingKeyManagerFactory.java: ########## @@ -0,0 +1,253 @@ +/* + * 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 com.datastax.oss.driver.internal.core.ssl; + +import com.datastax.oss.driver.shaded.guava.common.annotations.VisibleForTesting; +import java.io.ByteArrayInputStream; +import java.io.IOException; +import java.io.InputStream; +import java.net.Socket; +import java.nio.file.Files; +import java.nio.file.Path; +import java.security.KeyStore; +import java.security.KeyStoreException; +import java.security.MessageDigest; +import java.security.NoSuchAlgorithmException; +import java.security.Principal; +import java.security.PrivateKey; +import java.security.Provider; +import java.security.UnrecoverableKeyException; +import java.security.cert.CertificateException; +import java.security.cert.X509Certificate; +import java.time.Duration; +import java.util.Arrays; +import java.util.concurrent.Executors; +import java.util.concurrent.ScheduledExecutorService; +import java.util.concurrent.TimeUnit; +import java.util.concurrent.atomic.AtomicReference; +import javax.net.ssl.KeyManager; +import javax.net.ssl.KeyManagerFactory; +import javax.net.ssl.KeyManagerFactorySpi; +import javax.net.ssl.ManagerFactoryParameters; +import javax.net.ssl.SSLEngine; +import javax.net.ssl.X509ExtendedKeyManager; +import org.slf4j.Logger; +import org.slf4j.LoggerFactory; + +public class ReloadingKeyManagerFactory extends KeyManagerFactory implements AutoCloseable { + private static final Logger logger = LoggerFactory.getLogger(ReloadingKeyManagerFactory.class); + private static final String KEYSTORE_TYPE = "JKS"; + private Path keystorePath; + private String keystorePassword; + private ScheduledExecutorService executor; + private final Spi spi; + + // We're using a single thread executor so this shouldn't need to be volatile, since all updates + // to lastDigest should come from the same thread + private volatile byte[] lastDigest; + + /** + * Create a new {@link ReloadingKeyManagerFactory} with the given keystore file and password, + * reloading from the file's content at the given interval. This function will do an initial + * reload before returning, to confirm that the file exists and is readable. + * + * @param keystorePath the keystore file to reload + * @param keystorePassword the keystore password + * @param reloadInterval the duration between reload attempts. Set to {@link + * java.time.Duration#ZERO} to disable scheduled reloading. + * @return + */ + public static ReloadingKeyManagerFactory create( + Path keystorePath, String keystorePassword, Duration reloadInterval) + throws UnrecoverableKeyException, KeyStoreException, NoSuchAlgorithmException, + CertificateException, IOException { + KeyManagerFactory kmf = KeyManagerFactory.getInstance(KeyManagerFactory.getDefaultAlgorithm()); + + KeyStore ks; + try (InputStream ksf = Files.newInputStream(keystorePath)) { + ks = KeyStore.getInstance(KEYSTORE_TYPE); + ks.load(ksf, keystorePassword.toCharArray()); + } + kmf.init(ks, keystorePassword.toCharArray()); + + ReloadingKeyManagerFactory reloadingKeyManagerFactory = new ReloadingKeyManagerFactory(kmf); + reloadingKeyManagerFactory.start(keystorePath, keystorePassword, reloadInterval); + return reloadingKeyManagerFactory; + } + + @VisibleForTesting + protected ReloadingKeyManagerFactory(KeyManagerFactory initial) { + this( + new Spi((X509ExtendedKeyManager) initial.getKeyManagers()[0]), + initial.getProvider(), + initial.getAlgorithm()); + } + + private ReloadingKeyManagerFactory(Spi spi, Provider provider, String algorithm) { + super(spi, provider, algorithm); + this.spi = spi; + } + + private void start(Path keystorePath, String keystorePassword, Duration reloadInterval) { + this.keystorePath = keystorePath; + this.keystorePassword = keystorePassword; + + // Ensure that reload is called once synchronously, to make sure the file exists etc. + reload(); + + if (!reloadInterval.isZero()) { + this.executor = + Executors.newScheduledThreadPool( + 1, + runnable -> { + Thread t = Executors.defaultThreadFactory().newThread(runnable); + t.setName(String.format("%s-%%d", this.getClass().getSimpleName())); + t.setDaemon(true); + return t; + }); + this.executor.scheduleWithFixedDelay( + this::reload, + reloadInterval.toMillis(), + reloadInterval.toMillis(), + TimeUnit.MILLISECONDS); + } + } + + @VisibleForTesting + void reload() { + try { + reload0(); + } catch (Exception e) { + String msg = + "Failed to reload KeyStore. If this continues to happen, your client may use stale identity" + + "certificates and fail to re-establish connections to Cassandra hosts."; + logger.warn(msg, e); + } + } + + private synchronized void reload0() + throws NoSuchAlgorithmException, IOException, KeyStoreException, CertificateException, + UnrecoverableKeyException { + logger.debug("Checking KeyStore file {} for updates", keystorePath); + + final byte[] keyStoreBytes = Files.readAllBytes(keystorePath); + final byte[] newDigest = digest(keyStoreBytes); + if (lastDigest != null && Arrays.equals(lastDigest, digest(keyStoreBytes))) { + logger.debug("KeyStore file content has not changed; skipping update"); + return; + } + + final KeyStore keyStore = KeyStore.getInstance(KEYSTORE_TYPE); + try (InputStream inputStream = new ByteArrayInputStream(keyStoreBytes)) { + keyStore.load(inputStream, keystorePassword.toCharArray()); + } + KeyManagerFactory kmf = KeyManagerFactory.getInstance(KeyManagerFactory.getDefaultAlgorithm()); + kmf.init(keyStore, keystorePassword.toCharArray()); + logger.info("Detected updates to KeyStore file {}", keystorePath); + + this.spi.keyManager.set((X509ExtendedKeyManager) kmf.getKeyManagers()[0]); + this.lastDigest = newDigest; + } Review Comment: Agreed that it's not in any way essential; I think what you have here will work fine. -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: commits-unsubscr...@cassandra.apache.org For queries about this service, please contact Infrastructure at: us...@infra.apache.org --------------------------------------------------------------------- To unsubscribe, e-mail: commits-unsubscr...@cassandra.apache.org For additional commands, e-mail: commits-h...@cassandra.apache.org
