Github user necouchman commented on a diff in the pull request:
https://github.com/apache/incubator-guacamole-client/pull/121#discussion_r107400233
--- Diff:
extensions/guacamole-auth-cas/src/main/java/org/apache/guacamole/auth/cas/ticket/TicketValidationService.java
---
@@ -0,0 +1,80 @@
+/*
+ * 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.cas.ticket;
+
+import com.google.inject.Inject;
+import org.apache.guacamole.GuacamoleException;
+import org.apache.guacamole.GuacamoleSecurityException;
+import org.apache.guacamole.GuacamoleServerException;
+import org.apache.guacamole.auth.cas.conf.ConfigurationService;
+import org.jasig.cas.client.authentication.AttributePrincipal;
+import org.jasig.cas.client.validation.Assertion;
+import org.jasig.cas.client.validation.Cas20ProxyTicketValidator;
+import org.jasig.cas.client.validation.TicketValidationException;
+
+/**
+ * Service for validating ID tickets forwarded to us by the client,
verifying
+ * that they did indeed come from the CAS service.
+ */
+public class TicketValidationService {
+
+ /**
+ * Service for retrieving CAS configuration information.
+ */
+ @Inject
+ private ConfigurationService confService;
+
+ /**
+ * Validates and parses the given ID ticket, returning the username
contained
+ * therein, as defined by the username claim type given in
+ * guacamole.properties. If the username claim type is missing or the
ID
+ * ticket is invalid, an exception is thrown instead.
+ *
+ * @param ticket
+ * The ID ticket to validate and parse.
+ *
+ * @return
+ * The username contained within the given ID ticket.
+ *
+ * @throws GuacamoleException
+ * If the ID ticket is not valid, the username claim type is
missing, or
+ * guacamole.properties could not be parsed.
+ */
+ public String processUsername(String ticket) throws GuacamoleException
{
+ AttributePrincipal principal = null;
+
+ // Retrieve the configured CAS URL and establish a ticket validator
+ String casServerUrl = confService.getAuthorizationEndpoint();
+ Cas20ProxyTicketValidator sv = new
Cas20ProxyTicketValidator(casServerUrl);
+ sv.setAcceptAnyProxy(true);
+ try {
+ String confRedirectURI = confService.getRedirectURI();
+ Assertion a = sv.validate(ticket, confRedirectURI);
--- End diff --
Beefed up those comments a bit.
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