GUACAMOLE-1780: Unify session reactivation/invalidation behavior.

extensions/guacamole-auth-sso/modules/guacamole-auth-sso-base/src/main/java/org/apache/guacamole/auth/sso/AuthenticationSessionManager.java

@@ -19,8 +19,9 @@
 
 package org.apache.guacamole.auth.sso;
 
-import com.google.common.base.Predicates;
 import com.google.inject.Inject;
+import com.google.inject.Singleton;
+
 import java.util.Map;
 import java.util.concurrent.ConcurrentHashMap;
 import java.util.concurrent.ConcurrentMap;
@@ -38,6 +39,7 @@ import java.util.concurrent.TimeUnit;
  * @param <T>
  *     The type of sessions managed by this session manager.
  */
+@Singleton
 public class AuthenticationSessionManager<T extends AuthenticationSession> {
 
     /**
@@ -152,7 +154,8 @@ public class AuthenticationSessionManager<T extends AuthenticationSession> {
      */
     public T resume(String identifier) {
         if (identifier != null) {
-             T session = sessions.get(identifier);
+
+            T session = sessions.get(identifier);
 
             // Mark the session as pending. NOTE: Unless explicitly removed
             // from pending status via a call to reactivateSession(),

extensions/guacamole-auth-sso/modules/guacamole-auth-sso-base/src/main/java/org/apache/guacamole/auth/sso/SSOAuthenticationEventListener.java

@@ -0,0 +1,115 @@
+/*
+ * 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.guacamole.auth.sso;
+
+import org.apache.guacamole.GuacamoleClientException;
+import org.apache.guacamole.GuacamoleException;
+import org.apache.guacamole.GuacamoleSecurityException;
+import org.apache.guacamole.net.auth.Credentials;
+import org.apache.guacamole.net.auth.credentials.GuacamoleInsufficientCredentialsException;
+import org.apache.guacamole.net.event.AuthenticationFailureEvent;
+import org.apache.guacamole.net.event.AuthenticationRequestReceivedEvent;
+import org.apache.guacamole.net.event.CredentialEvent;
+import org.apache.guacamole.net.event.listener.Listener;
+
+/**
+ * A Listener that will reactivate or invalidate SSO auth sessions depending on
+ * overall auth success or failure.
+ */
+public abstract class SSOAuthenticationEventListener implements Listener {
+
+    @Override
+    public void handleEvent(Object event) throws GuacamoleException {
+
+        // If the authentication attempt is incomplete or credentials cannot be
+        // extracted, there's nothing to do
+        if (event instanceof AuthenticationRequestReceivedEvent
+                || !(event instanceof CredentialEvent))
+            return;
+
+        // Look for a session identifier associated with these credentials
+        String sessionIdentifier = getSessionIdentifier(
+                ((CredentialEvent) event).getCredentials());
+
+        // If no session is associated with these credentials, there's
+        // nothing to do
+        if (sessionIdentifier == null)
+            return;
+
+        // If the SSO auth succeeded, but other auth providers failed to
+        // authenticate the user associated with the credentials in this
+        // failure event, they may wish to make another login attempt. To
+        // avoid an infinite login attempt loop, re-enable the session
+        // associated with these credentials, allowing the auth attempt to be
+        // resumed without requiring another round trip to the SSO service.
+        if (event instanceof AuthenticationFailureEvent) {
+            Throwable failure = ((AuthenticationFailureEvent) event).getFailure();
+
+            // If and only if the failure was associated with missing or
+            // credentials, or a non-security related request issue,
+            // reactivate the session
+            if (failure instanceof GuacamoleInsufficientCredentialsException
+                    || ((failure instanceof GuacamoleClientException)
+                    && !(failure instanceof GuacamoleSecurityException))) {
+
+                reactivateSession(sessionIdentifier);
+                return;
+
+            }
+
+        }
+
+        // Invalidate the session in all other cases
+        invalidateSession(sessionIdentifier);
+
+    }
+
+    /**
+     * Get the session identifier associated with the provided credentials,
+     * if any. If no session is associated with the credentials, null will
+     * be returned.
+     *
+     * @param credentials
+     *     The credentials assoociated with the deferred SSO authentication
+     *     session to reactivate.
+     *
+     * @return
+     *     The session identifier associated with the provided credentials,
+     *     or null if no session is found.
+     */
+    protected abstract String getSessionIdentifier(Credentials credentials);
+
+    /**
+     * Reactivate the session identified by the provided identifier, if any.
+     *
+     * @param sessionIdentifier
+     *     The identifier of the session to reactivate.
+     */
+    protected abstract void reactivateSession(String sessionIdentifier);
+
+    /**
+     * Invalidate the session identified by the provided identifier, if any.
+     *
+     * @param sessionIdentifier
+     *     The identifier of the session to invalidate.
+     */
+    protected abstract void invalidateSession(String sessionIdentifier);
+
+}