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// Copyright Verizon Media. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.security.tls;
import com.yahoo.security.KeyStoreBuilder;
import com.yahoo.security.KeyStoreType;
import com.yahoo.security.KeyUtils;
import com.yahoo.security.X509CertificateUtils;
import java.io.IOException;
import java.io.UncheckedIOException;
import java.lang.ref.WeakReference;
import java.nio.file.Path;
import java.security.KeyStore;
import java.time.Duration;
import java.util.concurrent.Executors;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.ThreadFactory;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.logging.Level;
import java.util.logging.Logger;
class TlsManager {
private static final Logger log = Logger.getLogger(TlsManager.class.getName());
private static final Duration UPDATE_PERIOD = Duration.ofHours(1);
private final Path tlsConfigFile;
private final MutableX509TrustManager trustManager;
private final MutableX509KeyManager keyManager;
private final ScheduledExecutorService scheduler;
private TransportSecurityOptions options;
private final AtomicInteger references = new AtomicInteger(0);
private static void reloadTrustManager(TransportSecurityOptions options, MutableX509TrustManager trustManager) {
if (options.getCaCertificatesFile().isPresent()) {
trustManager.updateTruststore(loadTruststore(options.getCaCertificatesFile().get()));
} else {
trustManager.useDefaultTruststore();
}
}
private static void reloadKeyManager(TransportSecurityOptions options, MutableX509KeyManager keyManager) {
if (options.getPrivateKeyFile().isPresent() && options.getCertificatesFile().isPresent()) {
keyManager.updateKeystore(loadKeystore(options.getPrivateKeyFile().get(), options.getCertificatesFile().get()), new char[0]);
} else {
keyManager.useDefaultKeystore();
}
}
private static KeyStore loadTruststore(Path caCertificateFile) {
try {
return KeyStoreBuilder.withType(KeyStoreType.PKCS12)
.withCertificateEntries("cert", X509CertificateUtils.certificateListFromPem(com.yahoo.vespa.jdk8compat.Files.readString(caCertificateFile)))
.build();
} catch (IOException e) {
throw new UncheckedIOException(e);
}
}
private static KeyStore loadKeystore(Path privateKeyFile, Path certificatesFile) {
try {
return KeyStoreBuilder.withType(KeyStoreType.PKCS12)
.withKeyEntry(
"default",
KeyUtils.fromPemEncodedPrivateKey(com.yahoo.vespa.jdk8compat.Files.readString(privateKeyFile)),
X509CertificateUtils.certificateListFromPem(com.yahoo.vespa.jdk8compat.Files.readString(certificatesFile)))
.build();
} catch (IOException e) {
throw new UncheckedIOException(e);
}
}
// Note: no reference to outer class (directly or indirectly) to ensure trust/key managers are eventually GCed once
// there are no more use of the outer class and the underlying SSLContext
private static class CryptoMaterialReloader implements Runnable {
private final Path tlsOptionsConfigFile;
private final ScheduledExecutorService scheduler;
private final WeakReference<TlsManager> tlsManager;
CryptoMaterialReloader(Path tlsOptionsConfigFile,
ScheduledExecutorService scheduler,
TlsManager tlsManager) {
this.tlsOptionsConfigFile = tlsOptionsConfigFile;
this.scheduler = scheduler;
this.tlsManager = new WeakReference<>(tlsManager);
}
@Override
public void run() {
try {
TlsManager tlsManager = this.tlsManager.get();
if (tlsManager == null) {
// If reference count is done correctly this should not be necessary.
scheduler.shutdown();
return;
}
TransportSecurityOptions options = TransportSecurityOptions.fromJsonFile(tlsOptionsConfigFile);
reloadTrustManager(options, tlsManager.getTrustManager());
reloadKeyManager(options, tlsManager.getKeyManager());
} catch (Throwable t) {
log.log(Level.SEVERE, String.format("Failed to reload crypto material (path='%s'): %s", tlsOptionsConfigFile, t.getMessage()), t);
}
}
}
// Static class to ensure no reference to outer class is contained
private static class ReloaderThreadFactory implements ThreadFactory {
Path fileName;
ReloaderThreadFactory(Path fileName) {
this.fileName = fileName;
}
@Override
public Thread newThread(Runnable r) {
Thread thread = new Thread(r, "tls-context-reloader:" + fileName.toString() );
thread.setDaemon(true);
return thread;
}
}
TlsManager(Path tlsOptionsConfigFile) {
tlsConfigFile = tlsOptionsConfigFile;
trustManager = new MutableX509TrustManager();
keyManager = new MutableX509KeyManager();
options = TransportSecurityOptions.fromJsonFile(tlsOptionsConfigFile);
reloadTrustManager(options, trustManager);
reloadKeyManager(options, keyManager);
scheduler = Executors.newSingleThreadScheduledExecutor(new ReloaderThreadFactory(tlsOptionsConfigFile));
this.scheduler.scheduleAtFixedRate(new CryptoMaterialReloader(tlsOptionsConfigFile, scheduler, this),
UPDATE_PERIOD.getSeconds()/*initial delay*/,
UPDATE_PERIOD.getSeconds(),
TimeUnit.SECONDS);
}
MutableX509TrustManager getTrustManager() {
return trustManager;
}
MutableX509KeyManager getKeyManager() {
return keyManager;
}
Path getTlsConfigFile() {
return tlsConfigFile;
}
TransportSecurityOptions getOptions() {
return options;
}
void close() {
scheduler.shutdown();
}
int addRef() { return references.incrementAndGet(); }
int subRef() { return references.decrementAndGet(); }
}
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