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/*
* Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
* or more contributor license agreements. Licensed under the Elastic License
* 2.0 and the Server Side Public License, v 1; you may not use this file except
* in compliance with, at your election, the Elastic License 2.0 or the Server
* Side Public License, v 1.
*/
package org.elasticsearch.common.settings;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import org.elasticsearch.cluster.ClusterState;
import org.elasticsearch.cluster.ClusterStateUpdateTask;
import org.elasticsearch.cluster.LocalNodeMasterListener;
import org.elasticsearch.cluster.metadata.Metadata;
import org.elasticsearch.cluster.service.ClusterService;
import org.elasticsearch.common.Priority;
import org.elasticsearch.common.UUIDs;
import org.elasticsearch.common.hash.MessageDigests;
import org.elasticsearch.core.SuppressForbidden;
import java.nio.charset.StandardCharsets;
import java.security.NoSuchAlgorithmException;
import java.security.spec.InvalidKeySpecException;
import java.util.Arrays;
import java.util.Base64;
import java.util.Collection;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;
import java.util.concurrent.atomic.AtomicBoolean;
import java.util.function.Consumer;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.PBEKeySpec;
/**
* Used to publish secure setting hashes in the cluster state and to validate those hashes against the local values of those same settings.
* This is colloquially referred to as the secure setting consistency check. It will publish and verify hashes only for the collection
* of settings passed in the constructor. The settings have to have the {@link Setting.Property#Consistent} property.
*/
public final class ConsistentSettingsService {
private static final Logger logger = LogManager.getLogger(ConsistentSettingsService.class);
private final Settings settings;
private final ClusterService clusterService;
private final Collection> secureSettingsCollection;
private final SecretKeyFactory pbkdf2KeyFactory;
public ConsistentSettingsService(Settings settings, ClusterService clusterService, Collection> secureSettingsCollection) {
this.settings = settings;
this.clusterService = clusterService;
this.secureSettingsCollection = secureSettingsCollection;
// this is used to compute the PBKDF2 hash (the published one)
try {
this.pbkdf2KeyFactory = SecretKeyFactory.getInstance("PBKDF2WithHmacSHA512");
} catch (NoSuchAlgorithmException e) {
throw new RuntimeException("The \"PBKDF2WithHmacSHA512\" algorithm is required for consistent secure settings' hashes", e);
}
}
/**
* Returns a {@link LocalNodeMasterListener} that will publish hashes of all the settings passed in the constructor. These hashes are
* published by the master node only. Note that this is not designed for {@link SecureSettings} implementations that are mutable.
*/
public LocalNodeMasterListener newHashPublisher() {
// eagerly compute hashes to be published
final Map computedHashesOfConsistentSettings = computeHashesOfConsistentSecureSettings();
return new HashesPublisher(computedHashesOfConsistentSettings, clusterService);
}
/**
* Verifies that the hashes of consistent secure settings in the latest {@code ClusterState} verify for the values of those same
* settings on the local node. The settings to be checked are passed in the constructor. Also, validates that a missing local
* value is also missing in the published set, and vice-versa.
*/
public boolean areAllConsistent() {
final ClusterState state = clusterService.state();
final Map publishedHashesOfConsistentSettings = state.metadata().hashesOfConsistentSettings();
final Set publishedSettingKeysToVerify = new HashSet<>();
publishedSettingKeysToVerify.addAll(publishedHashesOfConsistentSettings.keySet());
final AtomicBoolean allConsistent = new AtomicBoolean(true);
forEachConcreteSecureSettingDo(concreteSecureSetting -> {
final String publishedSaltAndHash = publishedHashesOfConsistentSettings.get(concreteSecureSetting.getKey());
final byte[] localHash = concreteSecureSetting.getSecretDigest(settings);
if (publishedSaltAndHash == null && localHash == null) {
// consistency of missing
logger.debug(
"no published hash for the consistent secure setting [{}] but it also does NOT exist on the local node",
concreteSecureSetting.getKey()
);
} else if (publishedSaltAndHash == null && localHash != null) {
// setting missing on master but present locally
logger.warn(
"no published hash for the consistent secure setting [{}] but it exists on the local node",
concreteSecureSetting.getKey()
);
if (state.nodes().isLocalNodeElectedMaster()) {
throw new IllegalStateException(
"Master node cannot validate consistent setting. No published hash for ["
+ concreteSecureSetting.getKey()
+ "] but setting exists."
);
}
allConsistent.set(false);
} else if (publishedSaltAndHash != null && localHash == null) {
// setting missing locally but present on master
logger.warn(
"the consistent secure setting [{}] does not exist on the local node but there is a published hash for it",
concreteSecureSetting.getKey()
);
allConsistent.set(false);
} else {
assert publishedSaltAndHash != null;
assert localHash != null;
final String[] parts = publishedSaltAndHash.split(":");
if (parts == null || parts.length != 2) {
throw new IllegalArgumentException(
"published hash ["
+ publishedSaltAndHash
+ " ] for secure setting ["
+ concreteSecureSetting.getKey()
+ "] is invalid"
);
}
final String publishedSalt = parts[0];
final String publishedHash = parts[1];
final byte[] computedSaltedHashBytes = computeSaltedPBKDF2Hash(localHash, publishedSalt.getBytes(StandardCharsets.UTF_8));
final String computedSaltedHash = new String(Base64.getEncoder().encode(computedSaltedHashBytes), StandardCharsets.UTF_8);
if (false == publishedHash.equals(computedSaltedHash)) {
logger.warn(
"the published hash [{}] of the consistent secure setting [{}] differs from the locally computed one [{}]",
publishedHash,
concreteSecureSetting.getKey(),
computedSaltedHash
);
if (state.nodes().isLocalNodeElectedMaster()) {
throw new IllegalStateException(
"Master node cannot validate consistent setting. The published hash ["
+ publishedHash
+ "] of the consistent secure setting ["
+ concreteSecureSetting.getKey()
+ "] differs from the locally computed one ["
+ computedSaltedHash
+ "]."
);
}
allConsistent.set(false);
}
}
publishedSettingKeysToVerify.remove(concreteSecureSetting.getKey());
});
// another case of settings missing locally, when group settings have not expanded to all the keys published
for (String publishedSettingKey : publishedSettingKeysToVerify) {
for (Setting setting : secureSettingsCollection) {
if (setting.match(publishedSettingKey)) {
// setting missing locally but present on master
logger.warn(
"the consistent secure setting [{}] does not exist on the local node but there is a published hash for it",
publishedSettingKey
);
allConsistent.set(false);
}
}
}
return allConsistent.get();
}
/**
* Iterate over the passed in secure settings, expanding {@link Setting.AffixSetting} to concrete settings, in the scope of the local
* settings.
*/
private void forEachConcreteSecureSettingDo(Consumer> secureSettingConsumer) {
for (Setting setting : secureSettingsCollection) {
assert setting.isConsistent() : "[" + setting.getKey() + "] is not a consistent setting";
if (setting instanceof Setting.AffixSetting) {
((Setting.AffixSetting) setting).getAllConcreteSettings(settings).forEach(concreteSetting -> {
assert concreteSetting instanceof SecureSetting : "[" + concreteSetting.getKey() + "] is not a secure setting";
secureSettingConsumer.accept((SecureSetting) concreteSetting);
});
} else if (setting instanceof SecureSetting) {
secureSettingConsumer.accept((SecureSetting) setting);
} else {
assert false : "Unrecognized consistent secure setting [" + setting.getKey() + "]";
}
}
}
private Map computeHashesOfConsistentSecureSettings() {
final Map hashesBySettingKey = new HashMap<>();
forEachConcreteSecureSettingDo(concreteSecureSetting -> {
final byte[] localHash = concreteSecureSetting.getSecretDigest(settings);
if (localHash != null) {
final String salt = UUIDs.randomBase64UUID();
final byte[] publicHash = computeSaltedPBKDF2Hash(localHash, salt.getBytes(StandardCharsets.UTF_8));
final String encodedPublicHash = new String(Base64.getEncoder().encode(publicHash), StandardCharsets.UTF_8);
hashesBySettingKey.put(concreteSecureSetting.getKey(), salt + ":" + encodedPublicHash);
}
});
return hashesBySettingKey;
}
private byte[] computeSaltedPBKDF2Hash(byte[] bytes, byte[] salt) {
final int iterations = 5000;
final int keyLength = 512;
char[] value = null;
try {
value = MessageDigests.toHexCharArray(bytes);
final PBEKeySpec spec = new PBEKeySpec(value, salt, iterations, keyLength);
final SecretKey key = pbkdf2KeyFactory.generateSecret(spec);
return key.getEncoded();
} catch (InvalidKeySpecException e) {
throw new RuntimeException("Unexpected exception when computing PBKDF2 hash", e);
} finally {
if (value != null) {
Arrays.fill(value, '0');
}
}
}
static final class HashesPublisher implements LocalNodeMasterListener {
// eagerly compute hashes to be published
final Map computedHashesOfConsistentSettings;
final ClusterService clusterService;
HashesPublisher(Map computedHashesOfConsistentSettings, ClusterService clusterService) {
this.computedHashesOfConsistentSettings = Map.copyOf(computedHashesOfConsistentSettings);
this.clusterService = clusterService;
}
@Override
public void onMaster() {
submitUnbatchedTask(clusterService, "publish-secure-settings-hashes", new ClusterStateUpdateTask(Priority.URGENT) {
@Override
public ClusterState execute(ClusterState currentState) {
final Map publishedHashesOfConsistentSettings = currentState.metadata().hashesOfConsistentSettings();
if (computedHashesOfConsistentSettings.equals(publishedHashesOfConsistentSettings)) {
logger.debug("Nothing to publish. What is already published matches this node's view.");
return currentState;
} else {
return ClusterState.builder(currentState)
.metadata(
Metadata.builder(currentState.metadata()).hashesOfConsistentSettings(computedHashesOfConsistentSettings)
)
.build();
}
}
@Override
public void onFailure(Exception e) {
logger.error("unable to publish secure settings hashes", e);
}
});
}
@Override
public void offMaster() {
logger.trace("I am no longer master, nothing to do");
}
}
@SuppressForbidden(reason = "legacy usage of unbatched task") // TODO add support for batching here
private static void submitUnbatchedTask(
ClusterService clusterService,
@SuppressWarnings("SameParameterValue") String source,
ClusterStateUpdateTask task
) {
clusterService.submitUnbatchedStateUpdateTask(source, task);
}
}
