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Posted to commits@knox.apache.org by sm...@apache.org on 2020/09/09 05:07:51 UTC

[knox] branch master updated: KNOX-2408 - Improved AliasBasedTokenState service and house-keeping (#371)

This is an automated email from the ASF dual-hosted git repository.

smolnar pushed a commit to branch master
in repository https://gitbox.apache.org/repos/asf/knox.git


The following commit(s) were added to refs/heads/master by this push:
     new fdcc6d4  KNOX-2408 - Improved AliasBasedTokenState service and house-keeping (#371)
fdcc6d4 is described below

commit fdcc6d4c57c72d5ae6d7600094119b8c6957525e
Author: Sandor Molnar <sm...@apache.org>
AuthorDate: Wed Sep 9 07:07:32 2020 +0200

    KNOX-2408 - Improved AliasBasedTokenState service and house-keeping (#371)
---
 .../gateway/config/impl/GatewayConfigImpl.java     |  13 ++
 .../security/impl/DefaultAliasService.java         |  23 +++-
 .../security/impl/DefaultKeystoreService.java      |  43 +++---
 .../services/security/impl/RemoteAliasService.java |   3 +-
 .../security/impl/ZookeeperRemoteAliasService.java |   3 +-
 .../token/impl/AliasBasedTokenStateService.java    | 145 ++++++++++++++-------
 .../token/impl/DefaultTokenStateService.java       | 118 +++++++----------
 .../token/impl/JournalBasedTokenStateService.java  |   2 +-
 .../token/impl/TokenStateServiceMessages.java      |  18 ++-
 .../services/security/CryptoServiceTest.java       |   5 +
 .../impl/RemoteAliasServiceTestProvider.java       |   3 +-
 .../impl/AliasBasedTokenStateServiceTest.java      |  81 ++++++++----
 .../impl/DefaultTokenAuthorityServiceTest.java     |  10 ++
 .../vault/HashicorpVaultAliasService.java          |   3 +-
 .../apache/knox/gateway/config/GatewayConfig.java  |  10 ++
 .../services/security/AbstractAliasService.java    |  34 +++++
 .../gateway/services/security/AliasService.java    |   2 +
 .../gateway/services/security/KeystoreService.java |   2 +
 .../org/apache/knox/gateway/GatewayTestConfig.java |  11 ++
 19 files changed, 360 insertions(+), 169 deletions(-)

diff --git a/gateway-server/src/main/java/org/apache/knox/gateway/config/impl/GatewayConfigImpl.java b/gateway-server/src/main/java/org/apache/knox/gateway/config/impl/GatewayConfigImpl.java
index 5329320..f2c33f3 100644
--- a/gateway-server/src/main/java/org/apache/knox/gateway/config/impl/GatewayConfigImpl.java
+++ b/gateway-server/src/main/java/org/apache/knox/gateway/config/impl/GatewayConfigImpl.java
@@ -114,6 +114,10 @@ public class GatewayConfigImpl extends Configuration implements GatewayConfig {
   private static final String CLIENT_AUTH_NEEDED = GATEWAY_CONFIG_FILE_PREFIX + ".client.auth.needed";
   private static final String CLIENT_AUTH_WANTED = GATEWAY_CONFIG_FILE_PREFIX + ".client.auth.wanted";
   private static final String KEYSTORE_TYPE = GATEWAY_CONFIG_FILE_PREFIX + ".keystore.type";
+  private static final String KEYSTORE_CACHE_LIMIT = GATEWAY_CONFIG_FILE_PREFIX + ".keystore.cache.size.limit";
+  private static final long DEFAULT_KEYSTORE_CACHE_LIMIT = 1000;
+  private static final String KEYSTORE_CACHE_ENTRY_TTL = GATEWAY_CONFIG_FILE_PREFIX + ".keystore.cache.entry.ttl";
+  private static final long DEFAULT_KEYSTORE_CACHE_ENTRY_TTL = 60;
   private static final String XFORWARDED_ENABLED = GATEWAY_CONFIG_FILE_PREFIX + ".xforwarded.enabled";
   private static final String EPHEMERAL_DH_KEY_SIZE = GATEWAY_CONFIG_FILE_PREFIX + ".jdk.tls.ephemeralDHKeySize";
   private static final String HTTP_CLIENT_MAX_CONNECTION = GATEWAY_CONFIG_FILE_PREFIX + ".httpclient.maxConnections";
@@ -1180,4 +1184,13 @@ public class GatewayConfigImpl extends Configuration implements GatewayConfig {
     return getBoolean(KNOX_HOMEPAGE_LOGOUT_ENABLED, false);
   }
 
+  @Override
+  public long getKeystoreCacheSizeLimit() {
+    return getLong(KEYSTORE_CACHE_LIMIT, DEFAULT_KEYSTORE_CACHE_LIMIT);
+  }
+
+  @Override
+  public long getKeystoreCacheEntryTimeToLiveInMinutes() {
+    return getLong(KEYSTORE_CACHE_ENTRY_TTL, DEFAULT_KEYSTORE_CACHE_ENTRY_TTL);
+  }
 }
diff --git a/gateway-server/src/main/java/org/apache/knox/gateway/services/security/impl/DefaultAliasService.java b/gateway-server/src/main/java/org/apache/knox/gateway/services/security/impl/DefaultAliasService.java
index c0a20ec..0496d12 100644
--- a/gateway-server/src/main/java/org/apache/knox/gateway/services/security/impl/DefaultAliasService.java
+++ b/gateway-server/src/main/java/org/apache/knox/gateway/services/security/impl/DefaultAliasService.java
@@ -22,6 +22,7 @@ import java.security.KeyStoreException;
 import java.security.cert.Certificate;
 import java.util.ArrayList;
 import java.util.Enumeration;
+import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
 import java.util.Set;
@@ -30,14 +31,14 @@ import org.apache.knox.gateway.GatewayMessages;
 import org.apache.knox.gateway.config.GatewayConfig;
 import org.apache.knox.gateway.i18n.messages.MessagesFactory;
 import org.apache.knox.gateway.services.ServiceLifecycleException;
-import org.apache.knox.gateway.services.security.AliasService;
+import org.apache.knox.gateway.services.security.AbstractAliasService;
 import org.apache.knox.gateway.services.security.AliasServiceException;
 import org.apache.knox.gateway.services.security.KeystoreService;
 import org.apache.knox.gateway.services.security.KeystoreServiceException;
 import org.apache.knox.gateway.services.security.MasterService;
 import org.apache.knox.gateway.util.PasswordUtils;
 
-public class DefaultAliasService implements AliasService {
+public class DefaultAliasService extends AbstractAliasService {
   private static final GatewayMessages LOG = MessagesFactory.get( GatewayMessages.class );
 
   private KeystoreService keystoreService;
@@ -194,6 +195,24 @@ public class DefaultAliasService implements AliasService {
     return getPasswordFromAliasForCluster(NO_CLUSTER_NAME, alias);
   }
 
+  //Overriding the default behavior as we want to avoid loading the keystore N-times from the file system
+  @Override
+  public Map<String, char[]> getPasswordsForGateway() throws AliasServiceException {
+    final Map<String, char[]> passwordAliasMap = new HashMap<>();
+    try {
+      final KeyStore gatewayCredentialStore = keystoreService.getCredentialStoreForCluster(NO_CLUSTER_NAME);
+      final Enumeration<String> aliases = gatewayCredentialStore.aliases();
+      String alias;
+      while (aliases.hasMoreElements()) {
+        alias = aliases.nextElement();
+        passwordAliasMap.put(alias, keystoreService.getCredentialForCluster(NO_CLUSTER_NAME, alias, gatewayCredentialStore));
+      }
+    } catch (KeystoreServiceException | KeyStoreException e) {
+      e.printStackTrace();
+    }
+    return passwordAliasMap;
+  }
+
   @Override
   public void generateAliasForGateway(String alias)
       throws AliasServiceException {
diff --git a/gateway-server/src/main/java/org/apache/knox/gateway/services/security/impl/DefaultKeystoreService.java b/gateway-server/src/main/java/org/apache/knox/gateway/services/security/impl/DefaultKeystoreService.java
index 559ac10..9487dc4 100644
--- a/gateway-server/src/main/java/org/apache/knox/gateway/services/security/impl/DefaultKeystoreService.java
+++ b/gateway-server/src/main/java/org/apache/knox/gateway/services/security/impl/DefaultKeystoreService.java
@@ -77,9 +77,7 @@ public class DefaultKeystoreService implements KeystoreService {
   private static GatewayMessages LOG = MessagesFactory.get(GatewayMessages.class);
   private static GatewayResources RES = ResourcesFactory.get(GatewayResources.class);
 
-  // Let's configure the cache with hard-coded attributes now; we can introduce new gateway configuration later on if
-  // needed visible for testing
-  final Cache<CacheKey, String> cache = Caffeine.newBuilder().expireAfterAccess(10, TimeUnit.MINUTES).maximumSize(1000).build();
+  Cache<CacheKey, String> cache;
 
   private GatewayConfig config;
 
@@ -105,6 +103,10 @@ public class DefaultKeystoreService implements KeystoreService {
         throw new ServiceLifecycleException(RES.failedToCreateKeyStoreDirectory(keyStoreDirPath.toString()));
       }
     }
+
+    if (this.cache == null) {
+      this.cache = Caffeine.newBuilder().expireAfterAccess(config.getKeystoreCacheEntryTimeToLiveInMinutes(), TimeUnit.MINUTES).maximumSize(config.getKeystoreCacheSizeLimit()).build();
+    }
   }
 
   @Override
@@ -330,18 +332,10 @@ public class DefaultKeystoreService implements KeystoreService {
         KeyStore ks = getCredentialStoreForCluster(clusterName);
         if (ks != null) {
           try {
-            char[] masterSecret = masterService.getMasterSecret();
-            Key credentialKey = ks.getKey(alias, masterSecret);
-            if (credentialKey != null) {
-              byte[] credentialBytes = credentialKey.getEncoded();
-              String credentialString = new String(credentialBytes, StandardCharsets.UTF_8);
-              credential = credentialString.toCharArray();
-              addToCache(clusterName, alias, credentialString);
-            }
-          } catch (UnrecoverableKeyException | NoSuchAlgorithmException | KeyStoreException e) {
+            credential = getCredentialForCluster(clusterName, alias, ks);
+          } catch (KeystoreServiceException e) {
             LOG.failedToGetCredentialForCluster(clusterName, e);
           }
-
         }
       }
     }
@@ -350,6 +344,22 @@ public class DefaultKeystoreService implements KeystoreService {
   }
 
   @Override
+  public char[] getCredentialForCluster(String clusterName, String alias, KeyStore ks) throws KeystoreServiceException {
+    try {
+      char[] credential = null;
+      final Key credentialKey = ks.getKey(alias, masterService.getMasterSecret());
+      if (credentialKey != null) {
+        final String credentialString = new String(credentialKey.getEncoded(), StandardCharsets.UTF_8);
+        credential = credentialString.toCharArray();
+        addToCache(clusterName, alias, credentialString);
+      }
+      return credential;
+    } catch (UnrecoverableKeyException | KeyStoreException | NoSuchAlgorithmException e) {
+      throw new KeystoreServiceException(e);
+    }
+  }
+
+  @Override
   public void removeCredentialForCluster(String clusterName, String alias) throws KeystoreServiceException {
     removeCredentialsForCluster(clusterName, Collections.singleton(alias));
   }
@@ -406,13 +416,6 @@ public class DefaultKeystoreService implements KeystoreService {
   /**
    * Called only from within critical sections of other methods above.
    */
-  private void removeFromCache(String clusterName, String alias) {
-    cache.invalidate(CacheKey.of(clusterName, alias));
-  }
-
-  /**
-   * Called only from within critical sections of other methods above.
-   */
   private void removeFromCache(String clusterName, Set<String> aliases) {
     Set<CacheKey> keys = new HashSet<>();
     for (String alias : aliases) {
diff --git a/gateway-server/src/main/java/org/apache/knox/gateway/services/security/impl/RemoteAliasService.java b/gateway-server/src/main/java/org/apache/knox/gateway/services/security/impl/RemoteAliasService.java
index 5f5b0ed..863956e 100644
--- a/gateway-server/src/main/java/org/apache/knox/gateway/services/security/impl/RemoteAliasService.java
+++ b/gateway-server/src/main/java/org/apache/knox/gateway/services/security/impl/RemoteAliasService.java
@@ -22,6 +22,7 @@ import org.apache.knox.gateway.config.GatewayConfig;
 import org.apache.knox.gateway.i18n.messages.MessagesFactory;
 import org.apache.knox.gateway.security.RemoteAliasServiceProvider;
 import org.apache.knox.gateway.services.ServiceLifecycleException;
+import org.apache.knox.gateway.services.security.AbstractAliasService;
 import org.apache.knox.gateway.services.security.AliasService;
 import org.apache.knox.gateway.services.security.AliasServiceException;
 import org.apache.knox.gateway.services.security.MasterService;
@@ -50,7 +51,7 @@ import java.util.Set;
  *
  * @since 1.1.0
  */
-public class RemoteAliasService implements AliasService {
+public class RemoteAliasService extends AbstractAliasService {
   public static final String REMOTE_ALIAS_SERVICE_TYPE = "type";
 
   private static final GatewayMessages LOG = MessagesFactory.get(GatewayMessages.class);
diff --git a/gateway-server/src/main/java/org/apache/knox/gateway/services/security/impl/ZookeeperRemoteAliasService.java b/gateway-server/src/main/java/org/apache/knox/gateway/services/security/impl/ZookeeperRemoteAliasService.java
index afbbdf9..c781695 100644
--- a/gateway-server/src/main/java/org/apache/knox/gateway/services/security/impl/ZookeeperRemoteAliasService.java
+++ b/gateway-server/src/main/java/org/apache/knox/gateway/services/security/impl/ZookeeperRemoteAliasService.java
@@ -26,6 +26,7 @@ import org.apache.knox.gateway.service.config.remote.zk.ZooKeeperClientService;
 import org.apache.knox.gateway.services.ServiceLifecycleException;
 import org.apache.knox.gateway.services.config.client.RemoteConfigurationRegistryClient;
 import org.apache.knox.gateway.services.config.client.RemoteConfigurationRegistryClientService;
+import org.apache.knox.gateway.services.security.AbstractAliasService;
 import org.apache.knox.gateway.services.security.AliasService;
 import org.apache.knox.gateway.services.security.AliasServiceException;
 import org.apache.knox.gateway.services.security.EncryptionResult;
@@ -45,7 +46,7 @@ import java.util.Set;
 /**
  * An {@link AliasService} implementation based on zookeeper remote service registry.
  */
-public class ZookeeperRemoteAliasService implements AliasService {
+public class ZookeeperRemoteAliasService extends AbstractAliasService {
     public static final String TYPE = "zookeeper";
     public static final String PATH_KNOX = "/knox";
     public static final String PATH_KNOX_SECURITY = PATH_KNOX + "/security";
diff --git a/gateway-server/src/main/java/org/apache/knox/gateway/services/token/impl/AliasBasedTokenStateService.java b/gateway-server/src/main/java/org/apache/knox/gateway/services/token/impl/AliasBasedTokenStateService.java
index 598bd12..4886cef 100644
--- a/gateway-server/src/main/java/org/apache/knox/gateway/services/token/impl/AliasBasedTokenStateService.java
+++ b/gateway-server/src/main/java/org/apache/knox/gateway/services/token/impl/AliasBasedTokenStateService.java
@@ -16,17 +16,6 @@
  */
 package org.apache.knox.gateway.services.token.impl;
 
-import org.apache.knox.gateway.config.GatewayConfig;
-import org.apache.knox.gateway.services.ServiceLifecycleException;
-import org.apache.knox.gateway.services.security.AliasService;
-import org.apache.knox.gateway.services.security.AliasServiceException;
-import org.apache.knox.gateway.services.security.impl.DefaultKeystoreService;
-import org.apache.knox.gateway.services.security.token.UnknownTokenException;
-import org.apache.knox.gateway.services.token.state.JournalEntry;
-import org.apache.knox.gateway.services.token.state.TokenStateJournal;
-import org.apache.knox.gateway.services.token.TokenStateServiceStatistics;
-import org.apache.knox.gateway.services.token.impl.state.TokenStateJournalFactory;
-
 import java.io.IOException;
 import java.nio.file.Path;
 import java.nio.file.Paths;
@@ -36,11 +25,27 @@ import java.util.HashMap;
 import java.util.HashSet;
 import java.util.List;
 import java.util.Map;
+import java.util.Optional;
 import java.util.Set;
+import java.util.concurrent.ExecutorService;
 import java.util.concurrent.Executors;
 import java.util.concurrent.ScheduledExecutorService;
 import java.util.concurrent.TimeUnit;
-import java.util.stream.Collectors;
+import java.util.concurrent.atomic.AtomicBoolean;
+
+import org.apache.commons.lang3.builder.EqualsBuilder;
+import org.apache.commons.lang3.builder.HashCodeBuilder;
+import org.apache.commons.lang3.concurrent.BasicThreadFactory;
+import org.apache.knox.gateway.config.GatewayConfig;
+import org.apache.knox.gateway.services.ServiceLifecycleException;
+import org.apache.knox.gateway.services.security.AliasService;
+import org.apache.knox.gateway.services.security.AliasServiceException;
+import org.apache.knox.gateway.services.security.impl.DefaultKeystoreService;
+import org.apache.knox.gateway.services.security.token.UnknownTokenException;
+import org.apache.knox.gateway.services.token.TokenStateServiceStatistics;
+import org.apache.knox.gateway.services.token.impl.state.TokenStateJournalFactory;
+import org.apache.knox.gateway.services.token.state.JournalEntry;
+import org.apache.knox.gateway.services.token.state.TokenStateJournal;
 
 /**
  * A TokenStateService implementation based on the AliasService.
@@ -57,6 +62,8 @@ public class AliasBasedTokenStateService extends DefaultTokenStateService {
 
   private final List<TokenState> unpersistedState = new ArrayList<>();
 
+  private final AtomicBoolean readyForEviction = new AtomicBoolean(false);
+
   private TokenStateJournal journal;
 
   private Path gatewayCredentialsFilePath;
@@ -122,6 +129,51 @@ public class AliasBasedTokenStateService extends DefaultTokenStateService {
                                                     statePersistenceInterval,
                                                     TimeUnit.SECONDS);
     }
+
+    // Loading ALL entries from __gateway-credentials.jceks could be VERY time-consuming (it took a bit more than 19 minutes to load 12k aliases
+    // during my tests).
+    // Therefore, it's safer to do it in a background thread than just make the service start hang until it's finished
+    final ExecutorService gatewayCredentialsLoader = Executors.newSingleThreadExecutor(new BasicThreadFactory.Builder().namingPattern("GatewayCredentialsLoader").build());
+    gatewayCredentialsLoader.execute(this::loadGatewayCredentialsOnStartup);
+  }
+
+  private void loadGatewayCredentialsOnStartup() {
+    try {
+      log.loadingGatewayCredentialsOnStartup();
+      final long start = System.currentTimeMillis();
+      final Map<String, char[]> passwordAliasMap = aliasService.getPasswordsForGateway();
+      String alias, tokenId;
+      long expiration, maxLifeTime;
+      int count = 0;
+      for (Map.Entry<String, char[]> passwordAliasMapEntry : passwordAliasMap.entrySet()) {
+        alias = passwordAliasMapEntry.getKey();
+        if (alias.endsWith(TOKEN_MAX_LIFETIME_POSTFIX)) {
+          // This token state service implementation persists two aliases in __gateway-credentials.jceks (see persistTokenState below):
+          // - an alias which maps a token ID to its expiration time
+          // - another alias with '--max' postfix which maps the maximum lifetime of the token identified by the 1st alias
+          // Given this, we should check aliases ending with '--max' and calculate the token ID from this alias.
+          // If all aliases were blindly processed we would end-up handling aliases that were not persisted via this token state service
+          // implementation -> facing error(s) when trying to parse the expiration/maxLifeTime values and irrelevant data would be loaded in the
+          // in-memory collections in the parent class
+          tokenId = alias.substring(0, alias.indexOf(TOKEN_MAX_LIFETIME_POSTFIX));
+          expiration = convertCharArrayToLong(passwordAliasMap.get(tokenId));
+          maxLifeTime = convertCharArrayToLong(passwordAliasMapEntry.getValue());
+          super.updateExpiration(tokenId, expiration);
+          super.setMaxLifetime(tokenId, maxLifeTime);
+          count++;
+        }
+      }
+      log.loadedGatewayCredentialsOnStartup(count * 2, System.currentTimeMillis() - start);  //count is multiplied by two: tokenId + tokenId--max
+    } catch (AliasServiceException e) {
+      log.errorWhileLoadingGatewayCredentialsOnStartup(e.getMessage(), e);
+    } finally {
+      readyForEviction.set(true);
+    }
+  }
+
+  @Override
+  protected boolean readyForEviction() {
+    return readyForEviction.get();
   }
 
   @Override
@@ -219,7 +271,7 @@ public class AliasBasedTokenStateService extends DefaultTokenStateService {
       try {
         char[] maxLifetimeStr = getPasswordUsingAliasService(tokenId + TOKEN_MAX_LIFETIME_POSTFIX);
         if (maxLifetimeStr != null) {
-          result = Long.parseLong(new String(maxLifetimeStr));
+          result = convertCharArrayToLong(maxLifetimeStr);
         }
       } catch (AliasServiceException e) {
         log.errorAccessingTokenState(tokenId, e);
@@ -236,6 +288,10 @@ public class AliasBasedTokenStateService extends DefaultTokenStateService {
     return password;
   }
 
+  private long convertCharArrayToLong(char[] charArray) {
+    return Long.parseLong(new String(charArray));
+  }
+
   @Override
   public long getTokenExpiration(String tokenId, boolean validate) throws UnknownTokenException {
     // Check the in-memory collection first, to avoid costly keystore access when possible
@@ -301,16 +357,13 @@ public class AliasBasedTokenStateService extends DefaultTokenStateService {
           unpersistedToRemove.add(state);
         }
       }
-      for (TokenState state : unpersistedToRemove) {
-        unpersistedState.remove(state);
-      }
+      unpersistedState.removeAll(unpersistedToRemove);
     }
 
     // Add the max lifetime aliases to the list of aliases to remove
     Set<String> aliasesToRemove = new HashSet<>(tokenIds);
     for (String tokenId : tokenIds) {
       aliasesToRemove.add(tokenId + TOKEN_MAX_LIFETIME_POSTFIX);
-      log.removingTokenStateAliases(tokenId);
     }
 
     if (!aliasesToRemove.isEmpty()) {
@@ -321,9 +374,7 @@ public class AliasBasedTokenStateService extends DefaultTokenStateService {
           tokenStateServiceStatistics.interactKeystore(TokenStateServiceStatistics.KeystoreInteraction.REMOVE_ALIAS);
           tokenStateServiceStatistics.setGatewayCredentialsFileSize(this.gatewayCredentialsFilePath.toFile().length());
         }
-        for (String tokenId : tokenIds) {
-          log.removedTokenStateAliases(tokenId);
-        }
+        log.removedTokenStateAliases(String.join(", ", tokenIds));
       } catch (AliasServiceException e) {
         log.failedToRemoveTokenStateAliases(e);
       }
@@ -334,37 +385,17 @@ public class AliasBasedTokenStateService extends DefaultTokenStateService {
 
   @Override
   protected void updateExpiration(final String tokenId, long expiration) {
+    //Update in-memory
     super.updateExpiration(tokenId, expiration);
-    try {
-      aliasService.removeAliasForCluster(AliasService.NO_CLUSTER_NAME, tokenId);
-      aliasService.addAliasForCluster(AliasService.NO_CLUSTER_NAME, tokenId, String.valueOf(expiration));
-      if (tokenStateServiceStatistics != null) {
-        tokenStateServiceStatistics.interactKeystore(TokenStateServiceStatistics.KeystoreInteraction.REMOVE_ALIAS);
-        tokenStateServiceStatistics.interactKeystore(TokenStateServiceStatistics.KeystoreInteraction.SAVE_ALIAS);
-        tokenStateServiceStatistics.setGatewayCredentialsFileSize(this.gatewayCredentialsFilePath.toFile().length());
-      }
-    } catch (AliasServiceException e) {
-      log.failedToUpdateTokenExpiration(tokenId, e);
-    }
-  }
 
-
-  @Override
-  protected List<String> getTokens() {
-    List<String> tokenIds = null;
-
-    try {
-      List<String> allAliases = aliasService.getAliasesForCluster(AliasService.NO_CLUSTER_NAME);
-      if (tokenStateServiceStatistics != null) {
-        tokenStateServiceStatistics.interactKeystore(TokenStateServiceStatistics.KeystoreInteraction.GET_ALIAS);
+    //Update the in-memory representation of unpersisted states that will be processed by the state persistence thread
+    synchronized (unpersistedState) {
+      final Optional<TokenState> tokenStateToRemove = unpersistedState.stream().filter(tokenState -> tokenState.getTokenId().equals(tokenId)).findFirst();
+      if (tokenStateToRemove.isPresent()) {
+        unpersistedState.remove(tokenStateToRemove.get());
       }
-      // Filter for the token state aliases (exclude aliases ending with TOKEN_MAX_LIFETIME_POSTFIX)
-      tokenIds = allAliases.stream().filter(alias -> !alias.endsWith(TOKEN_MAX_LIFETIME_POSTFIX)).collect(Collectors.toList());
-    } catch (AliasServiceException e) {
-      log.errorAccessingTokenState(e);
+      unpersistedState.add(new TokenExpiration(tokenId, expiration));
     }
-
-    return (tokenIds != null ? tokenIds : Collections.emptyList());
   }
 
   interface TokenState {
@@ -398,6 +429,16 @@ public class AliasBasedTokenStateService extends DefaultTokenStateService {
     public String getAliasValue() {
       return String.valueOf(issueTime + maxLifetime);
     }
+
+    @Override
+    public int hashCode() {
+      return HashCodeBuilder.reflectionHashCode(this);
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+      return EqualsBuilder.reflectionEquals(this, obj);
+    }
   }
 
   private static final class TokenExpiration implements TokenState {
@@ -423,6 +464,16 @@ public class AliasBasedTokenStateService extends DefaultTokenStateService {
     public String getAliasValue() {
       return String.valueOf(expiration);
     }
+
+    @Override
+    public int hashCode() {
+      return HashCodeBuilder.reflectionHashCode(this);
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+      return EqualsBuilder.reflectionEquals(this, obj);
+    }
   }
 
 }
diff --git a/gateway-server/src/main/java/org/apache/knox/gateway/services/token/impl/DefaultTokenStateService.java b/gateway-server/src/main/java/org/apache/knox/gateway/services/token/impl/DefaultTokenStateService.java
index 850ac07..f58a7f1 100644
--- a/gateway-server/src/main/java/org/apache/knox/gateway/services/token/impl/DefaultTokenStateService.java
+++ b/gateway-server/src/main/java/org/apache/knox/gateway/services/token/impl/DefaultTokenStateService.java
@@ -19,11 +19,11 @@ package org.apache.knox.gateway.services.token.impl;
 import java.lang.management.ManagementFactory;
 import java.time.Instant;
 import java.util.Collections;
-import java.util.HashMap;
 import java.util.HashSet;
 import java.util.List;
 import java.util.Map;
 import java.util.Set;
+import java.util.concurrent.ConcurrentHashMap;
 import java.util.concurrent.Executors;
 import java.util.concurrent.ScheduledExecutorService;
 import java.util.concurrent.TimeUnit;
@@ -58,9 +58,9 @@ public class DefaultTokenStateService implements TokenStateService {
 
   protected static final TokenStateServiceMessages log = MessagesFactory.get(TokenStateServiceMessages.class);
 
-  private final Map<String, Long> tokenExpirations = new HashMap<>();
+  private final Map<String, Long> tokenExpirations = new ConcurrentHashMap<>();
 
-  private final Map<String, Long> maxTokenLifetimes = new HashMap<>();
+  private final Map<String, Long> maxTokenLifetimes = new ConcurrentHashMap<>();
 
   // Token eviction interval (in seconds)
   private long tokenEvictionInterval;
@@ -134,12 +134,8 @@ public class DefaultTokenStateService implements TokenStateService {
                              long   issueTime,
                              long   expiration,
                              long   maxLifetimeDuration) {
-    if (!isValidIdentifier(tokenId)) {
-      throw new IllegalArgumentException("Token identifier cannot be null.");
-    }
-    synchronized (tokenExpirations) {
-      tokenExpirations.put(tokenId, expiration);
-    }
+    validateTokenIdentifier(tokenId);
+    tokenExpirations.put(tokenId, expiration);
     setMaxLifetime(tokenId, issueTime, maxLifetimeDuration);
     log.addedToken(tokenId, getTimestampDisplay(expiration));
     if (tokenStateServiceStatistics != null) {
@@ -181,15 +177,11 @@ public class DefaultTokenStateService implements TokenStateService {
       validateToken(tokenId);
     }
 
-    long expiration = -1;
-    synchronized (tokenExpirations) {
-      expiration = tokenExpirations.getOrDefault(tokenId, -1L);
-    }
-    if (expiration == -1) {
+    final Long expiration = tokenExpirations.get(tokenId);
+    if (expiration == null) {
       throw new UnknownTokenException(tokenId);
     }
-
-    return expiration;
+    return expiration.longValue();
   }
 
   @Override
@@ -253,10 +245,12 @@ public class DefaultTokenStateService implements TokenStateService {
     return getTokenExpiration(token) <= System.currentTimeMillis();
   }
 
+  protected void setMaxLifetime(final String token, long parsedMaxLifeTime) {
+    maxTokenLifetimes.put(token, parsedMaxLifeTime);
+  }
+
   protected void setMaxLifetime(final String token, long issueTime, long maxLifetimeDuration) {
-    synchronized (maxTokenLifetimes) {
-      maxTokenLifetimes.put(token, issueTime + maxLifetimeDuration);
-    }
+    maxTokenLifetimes.put(token, issueTime + maxLifetimeDuration);
   }
 
   /**
@@ -264,19 +258,11 @@ public class DefaultTokenStateService implements TokenStateService {
    * @return false, if the service has previously stored the specified token; Otherwise, true.
    */
   protected boolean isUnknown(final String token) {
-    boolean isUnknown;
-
-    synchronized (tokenExpirations) {
-      isUnknown = !(tokenExpirations.containsKey(token));
-    }
-
-    return isUnknown;
+    return !tokenExpirations.containsKey(token);
   }
 
   protected void updateExpiration(final String tokenId, long expiration) {
-    synchronized (tokenExpirations) {
-      tokenExpirations.put(tokenId, expiration);
-    }
+    tokenExpirations.put(tokenId, expiration);
   }
 
   protected void removeToken(final String tokenId) throws UnknownTokenException {
@@ -296,15 +282,9 @@ public class DefaultTokenStateService implements TokenStateService {
   }
 
   private void removeTokenState(final Set<String> tokenIds) {
-    synchronized (tokenExpirations) {
-      tokenExpirations.keySet().removeAll(tokenIds);
-    }
-    synchronized (maxTokenLifetimes) {
-      maxTokenLifetimes.keySet().removeAll(tokenIds);
-    }
-    for (String tokenId : tokenIds) {
-      log.removedTokenState(tokenId);
-    }
+    tokenExpirations.keySet().removeAll(tokenIds);
+    maxTokenLifetimes.keySet().removeAll(tokenIds);
+    log.removedTokenState(String.join(", ", tokenIds));
   }
 
   protected boolean hasRemainingRenewals(final String tokenId, long renewInterval) {
@@ -313,15 +293,13 @@ public class DefaultTokenStateService implements TokenStateService {
   }
 
   protected long getMaxLifetime(final String tokenId) {
-    long result;
-    synchronized (maxTokenLifetimes) {
-      result = maxTokenLifetimes.getOrDefault(tokenId, 0L);
-    }
-    return result;
+    return maxTokenLifetimes.getOrDefault(tokenId, 0L);
   }
 
-  protected boolean isValidIdentifier(final String tokenId) {
-    return tokenId != null && !tokenId.isEmpty();
+  private void validateTokenIdentifier(final String tokenId) {
+    if (tokenId == null || tokenId.isEmpty()) {
+      throw new IllegalArgumentException("Token identifier cannot be null or empty.");
+    }
   }
 
   /**
@@ -333,9 +311,7 @@ public class DefaultTokenStateService implements TokenStateService {
    * @throws UnknownTokenException if the specified token in valid, but not known to the service.
    */
   protected void validateToken(final String tokenId) throws IllegalArgumentException, UnknownTokenException {
-    if (!isValidIdentifier(tokenId)) {
-      throw new IllegalArgumentException("Token identifier cannot be null.");
-    }
+    validateTokenIdentifier(tokenId);
 
     // First, make sure the token is one we know about
     if (isUnknown(tokenId)) {
@@ -344,7 +320,7 @@ public class DefaultTokenStateService implements TokenStateService {
     }
   }
 
-  protected String getTimestampDisplay(long timestamp) {
+  private String getTimestampDisplay(long timestamp) {
     return Instant.ofEpochMilli(timestamp).toString();
   }
 
@@ -352,28 +328,36 @@ public class DefaultTokenStateService implements TokenStateService {
    * Method that deletes expired tokens based on the token timestamp.
    */
   protected void evictExpiredTokens() {
-    Set<String> tokensToEvict = new HashSet<>();
-
-    for (final String tokenId : getTokens()) {
-      try {
-        if (needsEviction(tokenId)) {
-          log.evictToken(tokenId);
-          tokensToEvict.add(tokenId); // Add the token to the set of tokens to evict
+    if (readyForEviction()) {
+      final Set<String> tokensToEvict = new HashSet<>();
+
+      for (final String tokenId : getTokenIds()) {
+        try {
+          if (needsEviction(tokenId)) {
+            log.evictToken(tokenId);
+            tokensToEvict.add(tokenId); // Add the token to the set of tokens to evict
+          }
+        } catch (final Exception e) {
+          log.failedExpiredTokenEviction(tokenId, e);
         }
-      } catch (final Exception e) {
-        log.failedExpiredTokenEviction(tokenId, e);
       }
-    }
 
-    if (!tokensToEvict.isEmpty()) {
-      try {
-        removeTokens(tokensToEvict);
-      } catch (UnknownTokenException e) {
-        log.failedExpiredTokenEviction(e);
+      if (!tokensToEvict.isEmpty()) {
+        try {
+          removeTokens(tokensToEvict);
+        } catch (UnknownTokenException e) {
+          log.failedExpiredTokenEviction(e);
+        }
       }
+    } else {
+      log.skipEviction();
     }
   }
 
+  protected boolean readyForEviction() {
+    return true;
+  }
+
   /**
    * Method that checks if a token's state is a candidate for eviction.
    *
@@ -393,10 +377,8 @@ public class DefaultTokenStateService implements TokenStateService {
    *
    * @return
    */
-  protected List<String> getTokens() {
-    synchronized (tokenExpirations) {
-      return tokenExpirations.keySet().stream().collect(Collectors.toList());
-    }
+  private List<String> getTokenIds() {
+    return tokenExpirations.keySet().stream().collect(Collectors.toList());
   }
 
 }
diff --git a/gateway-server/src/main/java/org/apache/knox/gateway/services/token/impl/JournalBasedTokenStateService.java b/gateway-server/src/main/java/org/apache/knox/gateway/services/token/impl/JournalBasedTokenStateService.java
index 39feb7e..949a29a 100644
--- a/gateway-server/src/main/java/org/apache/knox/gateway/services/token/impl/JournalBasedTokenStateService.java
+++ b/gateway-server/src/main/java/org/apache/knox/gateway/services/token/impl/JournalBasedTokenStateService.java
@@ -42,7 +42,7 @@ public class JournalBasedTokenStateService extends DefaultTokenStateService {
             // Initialize the token state journal
             journal = TokenStateJournalFactory.create(config);
 
-            // Load any persisted journal entries, and add them to the unpersisted state collection
+            // Load any persisted journal entries, and add them to the in-memory collection
             List<JournalEntry> entries = journal.get();
             for (JournalEntry entry : entries) {
                 String id = entry.getTokenId();
diff --git a/gateway-server/src/main/java/org/apache/knox/gateway/services/token/impl/TokenStateServiceMessages.java b/gateway-server/src/main/java/org/apache/knox/gateway/services/token/impl/TokenStateServiceMessages.java
index 686d4bd..a83f638 100644
--- a/gateway-server/src/main/java/org/apache/knox/gateway/services/token/impl/TokenStateServiceMessages.java
+++ b/gateway-server/src/main/java/org/apache/knox/gateway/services/token/impl/TokenStateServiceMessages.java
@@ -33,8 +33,8 @@ public interface TokenStateServiceMessages {
   @Message(level = MessageLevel.DEBUG, text = "Revoked token {0}")
   void revokedToken(String tokenId);
 
-  @Message(level = MessageLevel.DEBUG, text = "Removed state for token {0}")
-  void removedTokenState(String tokenId);
+  @Message(level = MessageLevel.DEBUG, text = "Removed state for tokens {0}")
+  void removedTokenState(String tokenIds);
 
   @Message(level = MessageLevel.ERROR, text = "Unknown token {0}")
   void unknownToken(String tokenId);
@@ -67,6 +67,9 @@ public interface TokenStateServiceMessages {
   @Message(level = MessageLevel.ERROR, text = "Failed to remove token state aliases : {0}")
   void failedToRemoveTokenStateAliases(@StackTrace(level = MessageLevel.DEBUG) Exception e);
 
+  @Message(level = MessageLevel.DEBUG, text = "Skipping expired token eviction")
+  void skipEviction();
+
   @Message(level = MessageLevel.ERROR, text = "Failed to evict expired token {0} : {1}")
   void failedExpiredTokenEviction(String tokenId, @StackTrace(level = MessageLevel.DEBUG) Exception e);
 
@@ -95,7 +98,7 @@ public interface TokenStateServiceMessages {
   void removingTokenStateAliases(String tokenId);
 
   @Message(level = MessageLevel.INFO, text = "Removed token state aliases for {0}")
-  void removedTokenStateAliases(String tokenId);
+  void removedTokenStateAliases(String tokenIds);
 
   @Message(level = MessageLevel.DEBUG, text = "Loading peristed token state journal entries")
   void loadingPersistedJournalEntries();
@@ -136,4 +139,13 @@ public interface TokenStateServiceMessages {
   @Message(level = MessageLevel.ERROR, text = "Failed to remove the token state journal entries : {0}")
   void failedToRemoveJournalEntries(@StackTrace(level = MessageLevel.DEBUG) Exception e);
 
+  @Message(level = MessageLevel.INFO, text = "Loading Gateway credentials on startup...")
+  void loadingGatewayCredentialsOnStartup();
+
+  @Message(level = MessageLevel.INFO, text = "Loaded {0} Gateway credentials in {1} milliseonds")
+  void loadedGatewayCredentialsOnStartup(int count, long duration);
+
+  @Message(level = MessageLevel.ERROR, text = "Error while loading Gateway credentials on startup: {0}")
+  void errorWhileLoadingGatewayCredentialsOnStartup(String errorMessage, @StackTrace(level = MessageLevel.DEBUG) Exception e);
+
 }
diff --git a/gateway-server/src/test/java/org/apache/knox/gateway/services/security/CryptoServiceTest.java b/gateway-server/src/test/java/org/apache/knox/gateway/services/security/CryptoServiceTest.java
index dfcab8b..a87263b 100644
--- a/gateway-server/src/test/java/org/apache/knox/gateway/services/security/CryptoServiceTest.java
+++ b/gateway-server/src/test/java/org/apache/knox/gateway/services/security/CryptoServiceTest.java
@@ -92,6 +92,11 @@ public class CryptoServiceTest {
       }
 
       @Override
+      public Map<String, char[]> getPasswordsForGateway() throws AliasServiceException {
+        return null;
+      }
+
+      @Override
       public void generateAliasForGateway(String alias) {
       }
 
diff --git a/gateway-server/src/test/java/org/apache/knox/gateway/services/security/impl/RemoteAliasServiceTestProvider.java b/gateway-server/src/test/java/org/apache/knox/gateway/services/security/impl/RemoteAliasServiceTestProvider.java
index 23560df..e99aff3 100644
--- a/gateway-server/src/test/java/org/apache/knox/gateway/services/security/impl/RemoteAliasServiceTestProvider.java
+++ b/gateway-server/src/test/java/org/apache/knox/gateway/services/security/impl/RemoteAliasServiceTestProvider.java
@@ -20,6 +20,7 @@ package org.apache.knox.gateway.services.security.impl;
 import org.apache.knox.gateway.config.GatewayConfig;
 import org.apache.knox.gateway.security.RemoteAliasServiceProvider;
 import org.apache.knox.gateway.services.GatewayServices;
+import org.apache.knox.gateway.services.security.AbstractAliasService;
 import org.apache.knox.gateway.services.security.AliasService;
 import org.apache.knox.gateway.services.security.AliasServiceException;
 import org.apache.knox.gateway.services.security.MasterService;
@@ -49,7 +50,7 @@ public class RemoteAliasServiceTestProvider implements RemoteAliasServiceProvide
     return new TestAliasService();
   }
 
-  private class TestAliasService implements AliasService {
+  private class TestAliasService extends AbstractAliasService {
     private final Map<String, Map<String, String>> aliases = new HashMap<>();
     private GatewayConfig config;
 
diff --git a/gateway-server/src/test/java/org/apache/knox/gateway/services/token/impl/AliasBasedTokenStateServiceTest.java b/gateway-server/src/test/java/org/apache/knox/gateway/services/token/impl/AliasBasedTokenStateServiceTest.java
index 2b589fb..2c0fb6c 100644
--- a/gateway-server/src/test/java/org/apache/knox/gateway/services/token/impl/AliasBasedTokenStateServiceTest.java
+++ b/gateway-server/src/test/java/org/apache/knox/gateway/services/token/impl/AliasBasedTokenStateServiceTest.java
@@ -18,6 +18,7 @@ package org.apache.knox.gateway.services.token.impl;
 
 import org.apache.knox.gateway.config.GatewayConfig;
 import org.apache.knox.gateway.services.ServiceLifecycleException;
+import org.apache.knox.gateway.services.security.AbstractAliasService;
 import org.apache.knox.gateway.services.security.AliasService;
 import org.apache.knox.gateway.services.security.AliasServiceException;
 import org.apache.knox.gateway.services.security.token.TokenStateService;
@@ -26,6 +27,7 @@ import org.apache.knox.gateway.services.token.state.JournalEntry;
 import org.apache.knox.gateway.services.token.state.TokenStateJournal;
 import org.apache.knox.gateway.services.token.impl.state.TokenStateJournalFactory;
 import org.easymock.EasyMock;
+import org.junit.Ignore;
 import org.junit.Test;
 
 import java.lang.reflect.Field;
@@ -92,6 +94,9 @@ public class AliasBasedTokenStateServiceTest extends DefaultTokenStateServiceTes
     aliasService.removeAliasesForCluster(anyString(), anyObject());
     EasyMock.expectLastCall().andVoid().once();
 
+    //expecting this call when loading credentials from the keystore on startup
+    EasyMock.expect(aliasService.getPasswordsForGateway()).andReturn(Collections.emptyMap()).anyTimes();
+
     EasyMock.replay(aliasService);
 
     AliasBasedTokenStateService tss = new AliasBasedTokenStateService();
@@ -145,14 +150,17 @@ public class AliasBasedTokenStateServiceTest extends DefaultTokenStateServiceTes
     aliasService.removeAliasesForCluster(anyString(), anyObject());
     EasyMock.expectLastCall().andVoid().once();
 
+    //expecting this call when loading credentials from the keystore on startup
+    EasyMock.expect(aliasService.getPasswordsForGateway()).andReturn(Collections.emptyMap()).anyTimes();
+
     EasyMock.replay(aliasService);
 
     AliasBasedTokenStateService tss = new AliasBasedTokenStateService();
     tss.setAliasService(aliasService);
     initTokenStateService(tss);
 
-    Map<String, Long> tokenExpirations = getTokenExpirationsField(tss);
-    Map<String, Long> maxTokenLifetimes = getMaxTokenLifetimesField(tss);
+    Map<String, Long> tokenExpirations = getTokenExpirationsField(tss, false);
+    Map<String, Long> maxTokenLifetimes = getMaxTokenLifetimesField(tss, false);
 
     final long evictionInterval = TimeUnit.SECONDS.toMillis(3);
     final long maxTokenLifetime = evictionInterval * 3;
@@ -195,7 +203,8 @@ public class AliasBasedTokenStateServiceTest extends DefaultTokenStateServiceTes
    * Verify that the token state reaper includes token state which has not been cached, so it's not left in the keystore
    * forever.
    */
-  @Test
+  @Ignore("I'm not sure if this is a valid use case since we have everything in the cache when eviction takes place")
+  @Test()
   public void testTokenEvictionIncludesUncachedAliases() throws Exception {
     final long evictionInterval = TimeUnit.SECONDS.toMillis(3);
     final long maxTokenLifetime = evictionInterval * 3;
@@ -234,10 +243,12 @@ public class AliasBasedTokenStateServiceTest extends DefaultTokenStateServiceTes
     EasyMock.expectLastCall().andVoid().once();
     aliasService.getPasswordFromAliasForCluster(AliasService.NO_CLUSTER_NAME, uncachedTokenId);
     EasyMock.expectLastCall().andReturn(String.valueOf(uncachedTokenExpiration).toCharArray()).once();
+    //expecting this call when loading credentials from the keystore on startup
+    EasyMock.expect(aliasService.getPasswordsForGateway()).andReturn(Collections.emptyMap()).anyTimes();
 
     EasyMock.replay(aliasService);
 
-    AliasBasedTokenStateService tss = new AliasBasedTokenStateService();
+    AliasBasedTokenStateService tss = new NoEvictionAliasBasedTokenStateService();
     tss.setAliasService(aliasService);
     initTokenStateService(tss);
 
@@ -283,9 +294,12 @@ public class AliasBasedTokenStateServiceTest extends DefaultTokenStateServiceTes
     aliasService.addAliasesForCluster(anyString(), anyObject());
     EasyMock.expectLastCall().once(); // Expecting this during shutdown
 
+    //expecting this call when loading credentials from the keystore on startup
+    EasyMock.expect(aliasService.getPasswordsForGateway()).andReturn(Collections.emptyMap()).anyTimes();
+
     EasyMock.replay(aliasService);
 
-    AliasBasedTokenStateService tss = new AliasBasedTokenStateService();
+    AliasBasedTokenStateService tss = new NoEvictionAliasBasedTokenStateService();
     tss.setAliasService(aliasService);
     initTokenStateService(tss);
 
@@ -337,17 +351,17 @@ public class AliasBasedTokenStateServiceTest extends DefaultTokenStateServiceTes
 
   @Test
   public void testUpdateExpirationUsesCache() throws Exception {
-    AliasService aliasService = EasyMock.createMock(AliasService.class);
-    aliasService.addAliasForCluster(anyString(), anyString(), anyString());
-    EasyMock.expectLastCall().andVoid().atLeastOnce();
-    aliasService.removeAliasForCluster(anyString(), anyObject());
-    EasyMock.expectLastCall().andVoid().atLeastOnce();
+    final AliasService aliasService = EasyMock.createMock(AliasService.class);
+    // Neither addAliasForCluster nor removeAliasForCluster should be called because updating expiration should happen in memory and let the
+    // background persistence job done its job
     aliasService.addAliasesForCluster(anyString(), anyObject());
     EasyMock.expectLastCall().andVoid().once(); // Expecting this during shutdown
 
+    //expecting this call when loading credentials from the keystore on startup
+    EasyMock.expect(aliasService.getPasswordsForGateway()).andReturn(Collections.emptyMap()).anyTimes();
     EasyMock.replay(aliasService);
 
-    AliasBasedTokenStateService tss = new AliasBasedTokenStateService();
+    AliasBasedTokenStateService tss = new NoEvictionAliasBasedTokenStateService();
     tss.setAliasService(aliasService);
     initTokenStateService(tss);
 
@@ -385,9 +399,7 @@ public class AliasBasedTokenStateServiceTest extends DefaultTokenStateServiceTes
       // Invoking with true/false validation flags as it should not affect if values are coming from the cache
       int count = 0;
       for (String tokenId : tokenExpirations.keySet()) {
-        assertEquals("Expected the cached expiration to have been updated.",
-                     updatedExpiration,
-                     tss.getTokenExpiration(tokenId, count++ % 2 == 0));
+        assertEquals("Expected the cached expiration to have been updated.", updatedExpiration, tss.getTokenExpiration(tokenId, count++ % 2 == 0));
       }
 
     } finally {
@@ -405,17 +417,19 @@ public class AliasBasedTokenStateServiceTest extends DefaultTokenStateServiceTes
     EasyMock.expectLastCall().andReturn(Collections.emptyList()).anyTimes();
     aliasService.addAliasesForCluster(anyString(), anyObject());
     EasyMock.expectLastCall().once();
+
+    //expecting this call when loading credentials from the keystore on startup
+    EasyMock.expect(aliasService.getPasswordsForGateway()).andReturn(Collections.emptyMap()).anyTimes();
+
     EasyMock.replay(aliasService);
 
     tokenStatePersistenceInterval = 1L; // Override the persistence interval for this test
 
-    AliasBasedTokenStateService tss = new AliasBasedTokenStateService();
+    AliasBasedTokenStateService tss = new NoEvictionAliasBasedTokenStateService();
     tss.setAliasService(aliasService);
     initTokenStateService(tss);
 
-    Field maxTokenLifetimesField = tss.getClass().getSuperclass().getDeclaredField("maxTokenLifetimes");
-    maxTokenLifetimesField.setAccessible(true);
-    Map<String, Long> maxTokenLifetimes = (Map<String, Long>) maxTokenLifetimesField.get(tss);
+    Map<String, Long> maxTokenLifetimes = getMaxTokenLifetimesField(tss);
 
     Path journalDir = Paths.get(getGatewaySecurityDir(), "token-state");
 
@@ -500,7 +514,7 @@ public class AliasBasedTokenStateServiceTest extends DefaultTokenStateServiceTes
                   System.currentTimeMillis() + TimeUnit.HOURS.toMillis(24));
     }
 
-    AliasBasedTokenStateService tss = new AliasBasedTokenStateService();
+    AliasBasedTokenStateService tss = new NoEvictionAliasBasedTokenStateService();
     tss.setAliasService(aliasService);
 
     // Initialize the service, and presumably load the previously-persisted journal entries
@@ -576,7 +590,7 @@ public class AliasBasedTokenStateServiceTest extends DefaultTokenStateServiceTes
                                      String.valueOf(System.currentTimeMillis()),
                                      "invalidLongValue"));
 
-    AliasBasedTokenStateService tss = new AliasBasedTokenStateService();
+    AliasBasedTokenStateService tss = new NoEvictionAliasBasedTokenStateService();
     tss.setAliasService(aliasService);
 
     // Initialize the service, and presumably load the previously-persisted journal entries
@@ -614,7 +628,7 @@ public class AliasBasedTokenStateServiceTest extends DefaultTokenStateServiceTes
   /**
    * A dumbed-down AliasService implementation for testing purposes only.
    */
-  private static final class TestAliasService implements AliasService {
+  private static final class TestAliasService extends AbstractAliasService {
 
     private final Map<String, Map<String, String>> clusterAliases= new HashMap<>();
 
@@ -759,20 +773,29 @@ public class AliasBasedTokenStateServiceTest extends DefaultTokenStateServiceTes
   }
 
   private static Map<String, Long> getTokenExpirationsField(TokenStateService tss) throws Exception {
-    Field tokenExpirationsField = tss.getClass().getSuperclass().getDeclaredField("tokenExpirations");
+    return getTokenExpirationsField(tss, true);
+  }
+  private static Map<String, Long> getTokenExpirationsField(TokenStateService tss, boolean fromGrandParent) throws Exception {
+    final Class<TokenStateService> clazz = (Class<TokenStateService>) (fromGrandParent ? tss.getClass().getSuperclass().getSuperclass() : tss.getClass().getSuperclass());
+    final Field tokenExpirationsField = clazz.getDeclaredField("tokenExpirations");
     tokenExpirationsField.setAccessible(true);
     return (Map<String, Long>) tokenExpirationsField.get(tss);
   }
 
   private static Map<String, Long> getMaxTokenLifetimesField(TokenStateService tss) throws Exception {
-    Field maxTokenLifetimesField = tss.getClass().getSuperclass().getDeclaredField("maxTokenLifetimes");
+    return getMaxTokenLifetimesField(tss, true);
+  }
+
+  private static Map<String, Long> getMaxTokenLifetimesField(TokenStateService tss, boolean fromGrandParent) throws Exception {
+    final Class<TokenStateService> clazz = (Class<TokenStateService>) (fromGrandParent ? tss.getClass().getSuperclass().getSuperclass() : tss.getClass().getSuperclass());
+    Field maxTokenLifetimesField = clazz.getDeclaredField("maxTokenLifetimes");
     maxTokenLifetimesField.setAccessible(true);
     return (Map<String, Long>) maxTokenLifetimesField.get(tss);
   }
 
   private static List<AliasBasedTokenStateService.TokenState> getUnpersistedStateField(TokenStateService tss)
           throws Exception {
-    Field unpersistedStateField = tss.getClass().getDeclaredField("unpersistedState");
+    Field unpersistedStateField = tss.getClass().getSuperclass().getDeclaredField("unpersistedState");
     unpersistedStateField.setAccessible(true);
     return (List<AliasBasedTokenStateService.TokenState>) unpersistedStateField.get(tss);
 
@@ -817,4 +840,14 @@ public class AliasBasedTokenStateServiceTest extends DefaultTokenStateServiceTes
       return tokenId + "," + issueTime + "," + expiration + "," + maxLifetime;
     }
   }
+
+  private static class NoEvictionAliasBasedTokenStateService extends AliasBasedTokenStateService {
+
+    @Override
+    protected boolean readyForEviction() {
+      return false;
+    }
+
+  }
+
 }
diff --git a/gateway-server/src/test/java/org/apache/knox/gateway/services/token/impl/DefaultTokenAuthorityServiceTest.java b/gateway-server/src/test/java/org/apache/knox/gateway/services/token/impl/DefaultTokenAuthorityServiceTest.java
index 84817aa..83a663e 100644
--- a/gateway-server/src/test/java/org/apache/knox/gateway/services/token/impl/DefaultTokenAuthorityServiceTest.java
+++ b/gateway-server/src/test/java/org/apache/knox/gateway/services/token/impl/DefaultTokenAuthorityServiceTest.java
@@ -353,6 +353,8 @@ public class DefaultTokenAuthorityServiceTest {
     EasyMock.expect(config.getSigningKeystoreType()).andReturn("jks").atLeastOnce();
     EasyMock.expect(config.getSigningKeystorePasswordAlias()).andReturn(GatewayConfig.DEFAULT_SIGNING_KEYSTORE_PASSWORD_ALIAS).anyTimes();
     EasyMock.expect(config.getSigningKeyAlias()).andReturn("server").anyTimes();
+    EasyMock.expect(config.getKeystoreCacheEntryTimeToLiveInMinutes()).andReturn(0L).anyTimes();
+    EasyMock.expect(config.getKeystoreCacheSizeLimit()).andReturn(0L).anyTimes();
 
     MasterService ms = EasyMock.createMock(MasterService.class);
     EasyMock.expect(ms.getMasterSecret()).andReturn("horton".toCharArray()).atLeastOnce();
@@ -392,6 +394,8 @@ public class DefaultTokenAuthorityServiceTest {
     EasyMock.expect(config.getSigningKeystorePath()).andReturn(basedir + "/target/test-classes/keystores/missing-server-keystore.jks").atLeastOnce();
     EasyMock.expect(config.getSigningKeystoreType()).andReturn("jks").atLeastOnce();
     EasyMock.expect(config.getSigningKeystorePasswordAlias()).andReturn(GatewayConfig.DEFAULT_SIGNING_KEYSTORE_PASSWORD_ALIAS).anyTimes();
+    EasyMock.expect(config.getKeystoreCacheEntryTimeToLiveInMinutes()).andReturn(0L).anyTimes();
+    EasyMock.expect(config.getKeystoreCacheSizeLimit()).andReturn(0L).anyTimes();
 
     MasterService ms = EasyMock.createMock(MasterService.class);
     EasyMock.expect(ms.getMasterSecret()).andReturn("horton".toCharArray()).atLeastOnce();
@@ -436,6 +440,8 @@ public class DefaultTokenAuthorityServiceTest {
     EasyMock.expect(config.getSigningKeystoreType()).andReturn("jks").atLeastOnce();
     EasyMock.expect(config.getSigningKeystorePasswordAlias()).andReturn(GatewayConfig.DEFAULT_SIGNING_KEYSTORE_PASSWORD_ALIAS).anyTimes();
     EasyMock.expect(config.getSigningKeyAlias()).andReturn("server").anyTimes();
+    EasyMock.expect(config.getKeystoreCacheEntryTimeToLiveInMinutes()).andReturn(0L).anyTimes();
+    EasyMock.expect(config.getKeystoreCacheSizeLimit()).andReturn(0L).anyTimes();
 
     MasterService ms = EasyMock.createMock(MasterService.class);
     EasyMock.expect(ms.getMasterSecret()).andReturn("invalid_password".toCharArray()).atLeastOnce();
@@ -480,6 +486,8 @@ public class DefaultTokenAuthorityServiceTest {
     EasyMock.expect(config.getSigningKeystoreType()).andReturn("jks").atLeastOnce();
     EasyMock.expect(config.getSigningKeystorePasswordAlias()).andReturn(GatewayConfig.DEFAULT_SIGNING_KEYSTORE_PASSWORD_ALIAS).anyTimes();
     EasyMock.expect(config.getSigningKeyAlias()).andReturn("invalid_key").anyTimes();
+    EasyMock.expect(config.getKeystoreCacheEntryTimeToLiveInMinutes()).andReturn(0L).anyTimes();
+    EasyMock.expect(config.getKeystoreCacheSizeLimit()).andReturn(0L).anyTimes();
 
     MasterService ms = EasyMock.createMock(MasterService.class);
     EasyMock.expect(ms.getMasterSecret()).andReturn("horton".toCharArray()).atLeastOnce();
@@ -524,6 +532,8 @@ public class DefaultTokenAuthorityServiceTest {
     EasyMock.expect(config.getSigningKeystoreType()).andReturn("jks").atLeastOnce();
     EasyMock.expect(config.getSigningKeystorePasswordAlias()).andReturn(GatewayConfig.DEFAULT_SIGNING_KEYSTORE_PASSWORD_ALIAS).anyTimes();
     EasyMock.expect(config.getSigningKeyAlias()).andReturn("server").anyTimes();
+    EasyMock.expect(config.getKeystoreCacheEntryTimeToLiveInMinutes()).andReturn(0L).anyTimes();
+    EasyMock.expect(config.getKeystoreCacheSizeLimit()).andReturn(0L).anyTimes();
 
     MasterService ms = EasyMock.createMock(MasterService.class);
     EasyMock.expect(ms.getMasterSecret()).andReturn("horton".toCharArray()).atLeastOnce();
diff --git a/gateway-service-hashicorp-vault/src/main/java/org/apache/knox/gateway/backend/hashicorp/vault/HashicorpVaultAliasService.java b/gateway-service-hashicorp-vault/src/main/java/org/apache/knox/gateway/backend/hashicorp/vault/HashicorpVaultAliasService.java
index 05bc3dd..905d8d3 100644
--- a/gateway-service-hashicorp-vault/src/main/java/org/apache/knox/gateway/backend/hashicorp/vault/HashicorpVaultAliasService.java
+++ b/gateway-service-hashicorp-vault/src/main/java/org/apache/knox/gateway/backend/hashicorp/vault/HashicorpVaultAliasService.java
@@ -20,6 +20,7 @@ package org.apache.knox.gateway.backend.hashicorp.vault;
 import org.apache.knox.gateway.backend.hashicorp.vault.authentication.HashicorpVaultClientAuthenticationProvider;
 import org.apache.knox.gateway.config.GatewayConfig;
 import org.apache.knox.gateway.services.ServiceLifecycleException;
+import org.apache.knox.gateway.services.security.AbstractAliasService;
 import org.apache.knox.gateway.services.security.AliasService;
 import org.apache.knox.gateway.services.security.AliasServiceException;
 import org.apache.knox.gateway.util.PasswordUtils;
@@ -40,7 +41,7 @@ import java.util.Map;
 import java.util.ServiceLoader;
 import java.util.Set;
 
-public class HashicorpVaultAliasService implements AliasService {
+public class HashicorpVaultAliasService extends AbstractAliasService {
   public static final String TYPE = "hashicorp.vault";
   public static final String VAULT_CONFIG_PREFIX = "hashicorp.vault.";
   public static final String VAULT_ADDRESS_KEY = VAULT_CONFIG_PREFIX + "address";
diff --git a/gateway-spi/src/main/java/org/apache/knox/gateway/config/GatewayConfig.java b/gateway-spi/src/main/java/org/apache/knox/gateway/config/GatewayConfig.java
index 91585e4..5955624 100644
--- a/gateway-spi/src/main/java/org/apache/knox/gateway/config/GatewayConfig.java
+++ b/gateway-spi/src/main/java/org/apache/knox/gateway/config/GatewayConfig.java
@@ -704,4 +704,14 @@ public interface GatewayConfig {
    * @return the whether logout from the knox home page is enabled or not
    */
   boolean homePageLogoutEnabled();
+
+  /**
+   * @return the maximum number of cache entries where keystore entries are stored
+   */
+  long getKeystoreCacheSizeLimit();
+
+  /**
+   * @return the time - in minutes - an entry should be live (i.e. must not expire) in keystore cache
+   */
+  long getKeystoreCacheEntryTimeToLiveInMinutes();
 }
diff --git a/gateway-spi/src/main/java/org/apache/knox/gateway/services/security/AbstractAliasService.java b/gateway-spi/src/main/java/org/apache/knox/gateway/services/security/AbstractAliasService.java
new file mode 100644
index 0000000..2637420
--- /dev/null
+++ b/gateway-spi/src/main/java/org/apache/knox/gateway/services/security/AbstractAliasService.java
@@ -0,0 +1,34 @@
+/*
+ * 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 org.apache.knox.gateway.services.security;
+
+import java.util.HashMap;
+import java.util.Map;
+
+public abstract class AbstractAliasService implements AliasService {
+
+  @Override
+  public Map<String, char[]> getPasswordsForGateway() throws AliasServiceException {
+    final Map<String, char[]> passwordAliasMap = new HashMap<>();
+    for (String alias : getAliasesForCluster(NO_CLUSTER_NAME)) {
+      passwordAliasMap.put(alias, getPasswordFromAliasForGateway(alias));
+    }
+    return passwordAliasMap;
+  }
+
+}
diff --git a/gateway-spi/src/main/java/org/apache/knox/gateway/services/security/AliasService.java b/gateway-spi/src/main/java/org/apache/knox/gateway/services/security/AliasService.java
index 730d932..39e3028 100644
--- a/gateway-spi/src/main/java/org/apache/knox/gateway/services/security/AliasService.java
+++ b/gateway-spi/src/main/java/org/apache/knox/gateway/services/security/AliasService.java
@@ -54,6 +54,8 @@ public interface AliasService extends Service {
   char[] getPasswordFromAliasForGateway(String alias)
       throws AliasServiceException;
 
+  Map<String, char[]> getPasswordsForGateway() throws AliasServiceException;
+
   char[] getGatewayIdentityPassphrase() throws AliasServiceException;
 
   char[] getGatewayIdentityKeystorePassword() throws AliasServiceException;
diff --git a/gateway-spi/src/main/java/org/apache/knox/gateway/services/security/KeystoreService.java b/gateway-spi/src/main/java/org/apache/knox/gateway/services/security/KeystoreService.java
index 68fb637..b2cb717 100644
--- a/gateway-spi/src/main/java/org/apache/knox/gateway/services/security/KeystoreService.java
+++ b/gateway-spi/src/main/java/org/apache/knox/gateway/services/security/KeystoreService.java
@@ -76,5 +76,7 @@ public interface KeystoreService extends Service {
 
   char[] getCredentialForCluster(String clusterName, String alias) throws KeystoreServiceException;
 
+  char[] getCredentialForCluster(String clusterName, String alias, KeyStore ks) throws KeystoreServiceException;
+
   String getKeystorePath();
 }
diff --git a/gateway-test-release-utils/src/main/java/org/apache/knox/gateway/GatewayTestConfig.java b/gateway-test-release-utils/src/main/java/org/apache/knox/gateway/GatewayTestConfig.java
index 558bb29..6b5b466 100644
--- a/gateway-test-release-utils/src/main/java/org/apache/knox/gateway/GatewayTestConfig.java
+++ b/gateway-test-release-utils/src/main/java/org/apache/knox/gateway/GatewayTestConfig.java
@@ -822,4 +822,15 @@ public class GatewayTestConfig extends Configuration implements GatewayConfig {
   public boolean homePageLogoutEnabled() {
     return false;
   }
+
+  @Override
+  public long getKeystoreCacheSizeLimit() {
+    return 0;
+  }
+
+  @Override
+  public long getKeystoreCacheEntryTimeToLiveInMinutes() {
+    return 0;
+  }
+
 }