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我在 linux 上有一个 tomcat 8.5 服务器设置，我希望用户首先使用我们的 CAS 服务器进行身份验证，这样只有登录的人才能查看该页面。应该如何设置一切才能使其正常工作？

我已经编译了所有 java-cas-client 代码，并将所有 jar 放在 $CATALINA_HOME/bin 下。在 $CATALINA_HOME/webapps/ROOT/WEB-INF/web.xml 中，我使用所示示例设置了过滤器。在 $CATALINA_HOME/webapps/ROOT/test.jsp 我有检查“request.getRemoteUser()”的代码。但是当我进入网页时，该值始终为空。我认为过滤器设置会在显示网页之前强制通过 CAS 登录。我可以看出，tomcat 至少正在查看过滤器，因为如果我在过滤器名称中输入错字，服务器将无法启动。

这是我的 web.xml 的设置方式：

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee
                      http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd"
  version="4.0"
  metadata-complete="true">

    <filter>
        <filter-name>CAS Single Sign Out Filter</filter-name>
        <filter-class>org.jasig.cas.client.session.SingleSignOutFilter</filter-class>
        <init-param>
            <param-name>casServerUrlPrefix</param-name>
            <param-value>https://[MYCASSERVER]/cas</param-value>
        </init-param>
    </filter>

    <listener>
        <listener-class>org.jasig.cas.client.session.SingleSignOutHttpSessionListener</listener-class>
    </listener>

    <filter>
        <filter-name>CAS Authentication Filter</filter-name>
        <!--<filter-class>org.jasig.cas.client.authentication.Saml11AuthenticationFilter</filter-class>-->
        <filter-class>org.jasig.cas.client.authentication.AuthenticationFilter</filter-class>
        <init-param>
            <param-name>casServerLoginUrl</param-name>
            <param-value>https://[MYCASSERVER]/cas/login</param-value>
        </init-param>
        <init-param>
            <param-name>serverName</param-name>
            <param-value>https://[MYAPPSERVER]</param-value>
        </init-param>
    </filter>

    <filter>
        <filter-name>CAS Validation Filter</filter-name>
        <filter-class>org.jasig.cas.client.validation.Cas30ProxyReceivingTicketValidationFilter</filter-class>
        <init-param>
            <param-name>casServerUrlPrefix</param-name>
            <param-value>https://[MYCASSERVER]/cas</param-value>
        </init-param>
        <init-param>
            <param-name>serverName</param-name>
            <param-value>https://[MYAPPSERVER]</param-value>
        </init-param>
        <init-param>
            <param-name>redirectAfterValidation</param-name>
            <param-value>true</param-value>
        </init-param>
        <init-param>
            <param-name>useSession</param-name>
            <param-value>true</param-value>
        </init-param>

        <init-param>
            <param-name>authn_method</param-name>
            <param-value>mfa-duo</param-value>
        </init-param>
    </filter>

    <filter>
        <filter-name>CAS HttpServletRequest Wrapper Filter</filter-name>
        <filter-class>org.jasig.cas.client.util.HttpServletRequestWrapperFilter</filter-class>
    </filter>

    <filter-mapping>
        <filter-name>CAS Single Sign Out Filter</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>

    <filter-mapping>
        <filter-name>CAS Validation Filter</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>

    <filter-mapping>
        <filter-name>CAS Authentication Filter</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>

    <filter-mapping>
        <filter-name>CAS HttpServletRequest Wrapper Filter</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>

  <display-name>Welcome to Tomcat</display-name>
  <description>
     Welcome to Tomcat
  </description>

</web-app>

这是我的 test.jsp 代码：

<%@page contentType="text/html" %>
<%@page pageEncoding="UTF-8" %>
<%@ page import="java.util.Map" %>
<%@ page import="java.util.Iterator" %>
<%@ page import="java.util.List" %>
<%@ page import="org.jasig.cas.client.authentication.AttributePrincipal" %>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">

<html>
<head>
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
    <title>CAS Example Java Web App</title>
</head>
<body>

<h1>CAS Example Java Web App</h1>
<p>A sample web application that exercises the CAS protocol features via the Java CAS Client.</p>
<hr>

<p><b>Authenticated User Id:</b> <a href="logout.jsp" title="Click here to log out"><%= request.getRemoteUser() %>
</a></p>

<%
    if (request.getUserPrincipal() != null) {
        AttributePrincipal principal = (AttributePrincipal) request.getUserPrincipal();

        final Map attributes = principal.getAttributes();

        if (attributes != null) {
            Iterator attributeNames = attributes.keySet().iterator();
            out.println("<b>Attributes:</b>");

            if (attributeNames.hasNext()) {
                out.println("<hr><table border='3pt' width='100%'>");
                out.println("<th colspan='2'>Attributes</th>");
                out.println("<tr><td><b>Key</b></td><td><b>Value</b></td></tr>");

                for (; attributeNames.hasNext(); ) {
                    out.println("<tr><td>");
                    String attributeName = (String) attributeNames.next();
                    out.println(attributeName);
                    out.println("</td><td>");
                    final Object attributeValue = attributes.get(attributeName);

                    if (attributeValue instanceof List) {
                        final List values = (List) attributeValue;
                        out.println("<strong>Multi-valued attribute: " + values.size() + "</strong>");
                        out.println("<ul>");
                        for (Object value : values) {
                            out.println("<li>" + value + "</li>");
                        }
                        out.println("</ul>");
                    } else {
                        out.println(attributeValue);
                    }
                    out.println("</td></tr>");
                }
                out.println("</table>");
            } else {
                out.print("No attributes are supplied by the CAS server.</p>");
            }
        } else {
            out.println("<pre>The attribute map is empty. Review your CAS filter configurations.</pre>");
        }
    } else {
        out.println("<pre>The user principal is empty from the request object. Review the wrapper filter configuration.</pre>");
    }
%>

</body>
</html>

我希望当我访问我的 test.jsp 网页时，它会首先强制我通过我的 CAS 页面登录。但相反，页面加载并说我以 null 身份登录，即使我手动进入 CAS 并登录，它仍然返回 null。我怀疑过滤器要么没有按照我想要（或期望）的方式运行，而且我对过滤器应该做什么还不够了解。

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