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// Copyright 2018 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.component.AbstractComponent;
import com.yahoo.config.provision.Zone;
import com.yahoo.jdisc.http.ssl.SslContextFactoryProvider;
import com.yahoo.log.LogLevel;
import com.yahoo.security.KeyStoreBuilder;
import com.yahoo.security.KeyStoreType;
import com.yahoo.security.KeyUtils;
import com.yahoo.vespa.athenz.api.AthenzService;
import com.yahoo.vespa.athenz.client.zts.DefaultZtsClient;
import com.yahoo.vespa.athenz.client.zts.Identity;
import com.yahoo.vespa.athenz.client.zts.ZtsClient;
import com.yahoo.vespa.athenz.identity.ServiceIdentityProvider;
import com.yahoo.vespa.athenz.utils.SiaUtils;
import com.yahoo.vespa.defaults.Defaults;
import com.yahoo.vespa.hosted.athenz.instanceproviderservice.config.AthenzProviderServiceConfig;
import org.eclipse.jetty.util.ssl.SslContextFactory;
import java.net.URI;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.security.GeneralSecurityException;
import java.security.KeyPair;
import java.security.KeyStore;
import java.security.PrivateKey;
import java.security.PublicKey;
import java.security.cert.X509Certificate;
import java.time.Duration;
import java.time.Instant;
import java.util.Optional;
import java.util.UUID;
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;
/**
* Configures the JDisc https connector with the configserver's Athenz provider certificate and private key.
*
* @author bjorncs
*/
public class ConfigserverSslContextFactoryProvider extends AbstractComponent implements SslContextFactoryProvider {
private static final String CERTIFICATE_ALIAS = "athenz";
private static final Duration EXPIRATION_MARGIN = Duration.ofHours(6);
private static final Path VESPA_SIA_DIRECTORY = Paths.get(Defaults.getDefaults().underVespaHome("var/vespa/sia"));
private static final Logger log = Logger.getLogger(ConfigserverSslContextFactoryProvider.class.getName());
private final SslContextFactory sslContextFactory;
private final ScheduledExecutorService scheduler =
Executors.newSingleThreadScheduledExecutor(runnable -> new Thread(runnable, "configserver-ssl-context-factory-provider"));
private final ZtsClient ztsClient;
private final KeyProvider keyProvider;
private final AthenzProviderServiceConfig.Zones zoneConfig;
private final AthenzService configserverIdentity;
@Inject
public ConfigserverSslContextFactoryProvider(ServiceIdentityProvider bootstrapIdentity,
KeyProvider keyProvider,
AthenzProviderServiceConfig config,
Zone zone) {
this.zoneConfig = getZoneConfig(config, zone);
this.ztsClient = new DefaultZtsClient(URI.create(zoneConfig.ztsUrl()), bootstrapIdentity);
this.keyProvider = keyProvider;
this.configserverIdentity = new AthenzService(zoneConfig.domain(), zoneConfig.serviceName());
Duration updatePeriod = Duration.ofDays(config.updatePeriodDays());
Path trustStoreFile = Paths.get(config.athenzCaTrustStore());
this.sslContextFactory = initializeSslContextFactory(keyProvider, trustStoreFile, updatePeriod, configserverIdentity, ztsClient, zoneConfig);
scheduler.scheduleAtFixedRate(new KeystoreUpdater(sslContextFactory),
updatePeriod.toDays()/*initial delay*/,
updatePeriod.toDays(),
TimeUnit.DAYS);
}
@Override
public SslContextFactory getInstance(String containerId, int port) {
return sslContextFactory;
}
Instant getCertificateNotAfter() {
try {
X509Certificate certificate = (X509Certificate) sslContextFactory.getKeyStore().getCertificate(CERTIFICATE_ALIAS);
return certificate.getNotAfter().toInstant();
} catch (GeneralSecurityException e) {
throw new IllegalStateException("Unable to find configserver certificate from keystore: " + e.getMessage(), e);
}
}
@Override
public void deconstruct() {
try {
scheduler.shutdownNow();
scheduler.awaitTermination(30, TimeUnit.SECONDS);
ztsClient.close();
} catch (InterruptedException e) {
throw new RuntimeException("Failed to shutdown Athenz certificate updater on time", e);
}
}
private static SslContextFactory initializeSslContextFactory(KeyProvider keyProvider,
Path trustStoreFile,
Duration updatePeriod,
AthenzService configserverIdentity,
ZtsClient ztsClient,
AthenzProviderServiceConfig.Zones zoneConfig) {
SslContextFactory factory = new SslContextFactory();
factory.setWantClientAuth(true);
KeyStore trustStore =
KeyStoreBuilder.withType(KeyStoreType.JKS)
.fromFile(trustStoreFile)
.build();
factory.setTrustStore(trustStore);
KeyStore keyStore =
tryReadKeystoreFile(configserverIdentity, updatePeriod)
.orElseGet(() -> updateKeystore(configserverIdentity, generateKeystorePassword(), keyProvider, ztsClient, zoneConfig));
factory.setKeyStore(keyStore);
factory.setKeyStorePassword("");
return factory;
}
private static Optional<KeyStore> tryReadKeystoreFile(AthenzService configserverIdentity, Duration updatePeriod) {
Optional<X509Certificate> certificate = SiaUtils.readCertificateFile(VESPA_SIA_DIRECTORY, configserverIdentity);
if (!certificate.isPresent()) return Optional.empty();
Optional<PrivateKey> privateKey = SiaUtils.readPrivateKeyFile(VESPA_SIA_DIRECTORY, configserverIdentity);
if (!privateKey.isPresent()) return Optional.empty();
Instant minimumExpiration = Instant.now().plus(updatePeriod).plus(EXPIRATION_MARGIN);
boolean isExpired = certificate.get().getNotAfter().toInstant().isBefore(minimumExpiration);
if (isExpired) return Optional.empty();
KeyStore keyStore = KeyStoreBuilder.withType(KeyStoreType.JKS)
.withKeyEntry(CERTIFICATE_ALIAS, privateKey.get(), certificate.get())
.build();
return Optional.of(keyStore);
}
private static KeyStore updateKeystore(AthenzService configserverIdentity,
char[] keystorePwd,
KeyProvider keyProvider,
ZtsClient ztsClient,
AthenzProviderServiceConfig.Zones zoneConfig) {
PrivateKey privateKey = keyProvider.getPrivateKey(zoneConfig.secretVersion());
PublicKey publicKey = KeyUtils.extractPublicKey(privateKey);
Identity serviceIdentity = ztsClient.getServiceIdentity(configserverIdentity,
Integer.toString(zoneConfig.secretVersion()),
new KeyPair(publicKey, privateKey),
zoneConfig.certDnsSuffix());
X509Certificate certificate = serviceIdentity.certificate();
SiaUtils.writeCertificateFile(VESPA_SIA_DIRECTORY, configserverIdentity, certificate);
SiaUtils.writePrivateKeyFile(VESPA_SIA_DIRECTORY, configserverIdentity, 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));
return KeyStoreBuilder.withType(KeyStoreType.JKS)
.withKeyEntry(CERTIFICATE_ALIAS, privateKey, keystorePwd, certificate)
.build();
}
private static char[] generateKeystorePassword() {
return UUID.randomUUID().toString().toCharArray();
}
private class KeystoreUpdater implements Runnable {
final SslContextFactory sslContextFactory;
KeystoreUpdater(SslContextFactory sslContextFactory) {
this.sslContextFactory = sslContextFactory;
}
@Override
public void run() {
try {
log.log(LogLevel.INFO, "Updating configserver provider certificate from ZTS");
char[] keystorePwd = generateKeystorePassword();
KeyStore keyStore = updateKeystore(configserverIdentity, keystorePwd, keyProvider, ztsClient, zoneConfig);
sslContextFactory.reload(scf -> {
scf.setKeyStore(keyStore);
scf.setKeyStorePassword(new String(keystorePwd));
});
log.log(LogLevel.INFO, "Certificate successfully updated");
} catch (Throwable t) {
log.log(LogLevel.ERROR, "Failed to update certificate from ZTS: " + t.getMessage(), t);
}
}
}
}
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