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// Copyright 2017 Yahoo Holdings. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.vespa.hosted.athenz.instanceproviderservice;
import com.google.inject.Inject;
import com.yahoo.cloud.config.ConfigserverConfig;
import com.yahoo.component.AbstractComponent;
import com.yahoo.config.provision.Zone;
import com.yahoo.jdisc.http.ssl.SslKeyStoreConfigurator;
import com.yahoo.jdisc.http.ssl.SslKeyStoreContext;
import com.yahoo.log.LogLevel;
import com.yahoo.vespa.defaults.Defaults;
import com.yahoo.vespa.hosted.athenz.instanceproviderservice.config.AthenzProviderServiceConfig;
import com.yahoo.vespa.hosted.athenz.instanceproviderservice.impl.AthenzCertificateClient;
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.security.GeneralSecurityException;
import java.security.KeyStore;
import java.security.KeyStoreException;
import java.security.PrivateKey;
import java.security.cert.Certificate;
import java.security.cert.X509Certificate;
import java.time.Duration;
import java.time.Instant;
import java.util.Optional;
import java.util.concurrent.Executors;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.TimeUnit;
import java.util.logging.Logger;
import static com.yahoo.vespa.hosted.athenz.instanceproviderservice.impl.Utils.getZoneConfig;
/**
* @author bjorncs
*/
@SuppressWarnings("unused") // Component injected into Jetty connector factory
public class AthenzSslKeyStoreConfigurator extends AbstractComponent implements SslKeyStoreConfigurator {
private static final Logger log = Logger.getLogger(AthenzSslKeyStoreConfigurator.class.getName());
private static final String CERTIFICATE_ALIAS = "athenz";
private static final String CERTIFICATE_PASSWORD = "athenz";
private static final Duration EXPIRATION_MARGIN = Duration.ofHours(6);
private final ScheduledExecutorService scheduler = Executors.newSingleThreadScheduledExecutor();
private final AthenzCertificateClient certificateClient;
private final KeyProvider keyProvider;
private final AthenzProviderServiceConfig.Zones zoneConfig;
private final Duration updatePeriod;
private final Path keystoreCachePath;
private volatile KeyStore currentKeyStore;
@Inject
public AthenzSslKeyStoreConfigurator(KeyProvider keyProvider,
AthenzProviderServiceConfig config,
Zone zone,
ConfigserverConfig configserverConfig) {
AthenzProviderServiceConfig.Zones zoneConfig = getZoneConfig(config, zone);
Path keystoreCachePath = createKeystoreCachePath(configserverConfig);
AthenzCertificateClient certificateClient = new AthenzCertificateClient(config, zoneConfig);
Duration updatePeriod = Duration.ofDays(config.updatePeriodDays());
this.certificateClient = certificateClient;
this.keyProvider = keyProvider;
this.zoneConfig = zoneConfig;
this.currentKeyStore = initializeKeystore(keyProvider, certificateClient, zoneConfig, keystoreCachePath, updatePeriod);
this.updatePeriod = updatePeriod;
this.keystoreCachePath = keystoreCachePath;
}
private static KeyStore initializeKeystore(KeyProvider keyProvider,
AthenzCertificateClient certificateClient,
AthenzProviderServiceConfig.Zones zoneConfig,
Path keystoreCachePath,
Duration updatePeriod) {
return tryReadKeystoreFile(keystoreCachePath.toFile(), updatePeriod)
.orElseGet(() -> downloadCertificate(keyProvider, certificateClient, zoneConfig, keystoreCachePath));
}
private static Optional<KeyStore> tryReadKeystoreFile(File certificateFile, Duration updatePeriod) {
try {
if (!certificateFile.exists()) return Optional.empty();
KeyStore keyStore = KeyStore.getInstance("JKS");
try (InputStream in = new BufferedInputStream(new FileInputStream(certificateFile))) {
keyStore.load(in, new char[0]);
}
Instant minimumExpiration = Instant.now().plus(updatePeriod).plus(EXPIRATION_MARGIN);
boolean isExpired = getCertificateExpiry(keyStore).isBefore(minimumExpiration);
if (isExpired) return Optional.empty();
return Optional.of(keyStore);
} catch (IOException | GeneralSecurityException e) {
log.log(LogLevel.ERROR, "Failed to read keystore from disk: " + e.getMessage(), e);
return Optional.empty();
}
}
private static Path createKeystoreCachePath(ConfigserverConfig configserverConfig) {
return Paths.get(
Defaults.getDefaults().underVespaHome(configserverConfig.configServerDBDir()),
"server-x509-athenz-cert.jks");
}
@Override
public void configure(SslKeyStoreContext sslKeyStoreContext) {
sslKeyStoreContext.updateKeyStore(currentKeyStore, CERTIFICATE_PASSWORD);
scheduler.scheduleAtFixedRate(new AthenzCertificateUpdater(sslKeyStoreContext),
updatePeriod.toDays()/*initial delay*/,
updatePeriod.toDays(),
TimeUnit.DAYS);
}
@Override
public void deconstruct() {
try {
scheduler.shutdownNow();
scheduler.awaitTermination(30, TimeUnit.SECONDS);
} catch (InterruptedException e) {
throw new RuntimeException("Failed to shutdown Athenz certificate updater on time", e);
}
}
Instant getCertificateExpiry() throws KeyStoreException {
return getCertificateExpiry(currentKeyStore);
}
private static Instant getCertificateExpiry(KeyStore keyStore) throws KeyStoreException {
X509Certificate certificate = (X509Certificate) keyStore.getCertificate(CERTIFICATE_ALIAS);
return certificate.getNotAfter().toInstant();
}
private static KeyStore downloadCertificate(KeyProvider keyProvider,
AthenzCertificateClient certificateClient,
AthenzProviderServiceConfig.Zones zoneConfig,
Path keystoreCachePath) {
try {
PrivateKey privateKey = keyProvider.getPrivateKey(zoneConfig.secretVersion());
X509Certificate certificate = certificateClient.updateCertificate(privateKey);
Instant expirationTime = certificate.getNotAfter().toInstant();
Duration expiry = Duration.between(certificate.getNotBefore().toInstant(), expirationTime);
log.log(LogLevel.INFO, String.format("Got Athenz x509 certificate with expiry %s (expires %s)", expiry, expirationTime));
KeyStore keyStore = KeyStore.getInstance("JKS");
keyStore.load(null);
keyStore.setKeyEntry(
CERTIFICATE_ALIAS, privateKey, CERTIFICATE_PASSWORD.toCharArray(), new Certificate[]{certificate});
tryWriteKeystore(keyStore, keystoreCachePath);
return keyStore;
} catch (IOException | GeneralSecurityException e) {
throw new RuntimeException(e);
}
}
private static void tryWriteKeystore(KeyStore keyStore, Path keystoreCachePath) {
try (OutputStream out = new BufferedOutputStream(new FileOutputStream(keystoreCachePath.toFile()))) {
keyStore.store(out, new char[0]);
} catch (IOException | GeneralSecurityException e) {
log.log(LogLevel.ERROR, "Failed to write keystore to disk: " + e.getMessage(), e);
}
}
private class AthenzCertificateUpdater implements Runnable {
private final SslKeyStoreContext sslKeyStoreContext;
AthenzCertificateUpdater(SslKeyStoreContext sslKeyStoreContext) {
this.sslKeyStoreContext = sslKeyStoreContext;
}
@Override
public void run() {
try {
log.log(LogLevel.INFO, "Updating Athenz certificate from ZTS");
currentKeyStore = downloadCertificate(keyProvider, certificateClient, zoneConfig, keystoreCachePath);
sslKeyStoreContext.updateKeyStore(currentKeyStore, CERTIFICATE_PASSWORD);
log.log(LogLevel.INFO, "Athenz certificate reload successfully completed");
} catch (Throwable e) {
log.log(LogLevel.ERROR, "Failed to update certificate from ZTS: " + e.getMessage(), e);
}
}
}
}
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