jmuehlner commented on code in PR #846:
URL: https://github.com/apache/guacamole-client/pull/846#discussion_r1244455421


##########
extensions/guacamole-auth-sso/modules/guacamole-auth-sso-ssl/src/main/java/org/apache/guacamole/auth/ssl/AuthenticationEventListener.java:
##########
@@ -0,0 +1,74 @@
+/*
+ * 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.ssl;
+
+import com.google.inject.Inject;
+import com.google.inject.Singleton;
+import org.apache.guacamole.GuacamoleException;
+import org.apache.guacamole.auth.ssl.SSLAuthenticationSessionManager;
+import org.apache.guacamole.net.event.AuthenticationFailureEvent;
+import org.apache.guacamole.net.event.AuthenticationSuccessEvent;
+import org.apache.guacamole.net.event.listener.Listener;
+
+/**
+ * A Listener that will reactivate or invalidate SSL auth sessions depending on
+ * overall auth success or failure.
+ */
+@Singleton
+public class AuthenticationEventListener implements Listener {
+
+    /**
+     * Session manager for generating and maintaining unique tokens to
+     * represent the authentication flow of a user who has only partially
+     * authenticated.
+     *
+     * Requires static injection due to the fact that the webapp just calls the
+     * constructor directly when creating new Listeners. The instances will not
+     * be constructed by guice.
+     */
+    @Inject
+    private static SSLAuthenticationSessionManager sessionManager;
+
+    @Override
+    public void handleEvent(Object event) throws GuacamoleException {
+
+        if (event instanceof AuthenticationSuccessEvent)
+
+            // After an auth attempt has fully succeeded, invalidate the 
session
+            // associated with the successful login event so it can't be reused
+            sessionManager.invalidateSession(
+                AuthenticationProviderService.getSessionIdentifier(
+                    ((AuthenticationSuccessEvent) event).getCredentials()));
+
+        else if (event instanceof AuthenticationFailureEvent)
+
+            // If the SSL 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 SSL service.
+            sessionManager.reactivateSession(
+                AuthenticationProviderService.getSessionIdentifier(
+                    ((AuthenticationFailureEvent) event).getCredentials()));
+
+    }
+
+}

Review Comment:
   Sure, done!



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