單點登入(八)cas支援客戶端登入——客戶端
阿新 • • 發佈:2019-02-08
客戶端即指使用CAS中央認證伺服器的應用程式,而不是指使用者瀏覽器
客戶端實現目標客戶端實現主要需要滿足5個case:
· 1. 使用者未在中央認證伺服器登陸,訪問客戶端受保護資源時,客戶端重定向到中央認證伺服器請求TGT認證,認證失敗,轉回客戶端登陸頁面,保證受保護資源URL資訊不丟失
· 2. 使用者未在中央認證伺服器登陸,訪問客戶端登陸頁面時,客戶端重定向到中央認證伺服器請求TGT認證,認證失敗,轉回客戶端登陸頁面,此次登入頁面不再受保護,允許訪問
· 3. 使用者已在中央認證伺服器登陸,訪問客戶端受保護資源時,客戶端重定向到中央認證伺服器請求TGT認證,認證成功,直接轉回受保護資源
· 4. 使用者在客戶端登陸頁面提交使用者名稱密碼,客戶端將使用者名稱密碼資訊提交給伺服器端,認證失敗,轉回客戶端登陸頁面,攜帶失敗資訊並保證轉到登陸頁面前受保護資源URL資訊不丟失
· 5. 使用者在客戶端登陸頁面提交使用者名稱密碼,客戶端將使用者名稱密碼資訊提交給伺服器端,認證成功,轉回轉到登陸頁面前受保護資源
對於case 1和case 3,普通的CAS客戶端即可滿足需求,但對於case 4和case 5,則需要我們定製自己的登陸頁面。對於case 2,主要是需要滿足部分登陸頁面希望在使用者未登陸狀態顯示登陸框,在已登陸狀態顯示使用者歡迎資訊的需求,實現這個需求我們是通過讓CAS客戶端認證器滿足一個排除約定,即當用戶請求路徑為登陸頁面且帶有validated=true的引數時,即不進行重定向TGT認證請求
客戶端修改方案
根據伺服器流程修改方案,我們可以知道,所有的遠端請求都必須攜帶有loginUrl引數資訊以使得伺服器端知道在認證失敗後轉向客戶端登陸頁面。而在CAS客戶端上,上一節的case 4和case 5,我們主要通過提交表單的方式傳遞loginUrl,而case 1, case 3則是依靠org.jasig.cas.client.authentication.AuthenticationFilter類進行的轉向,但使用AuthenticationFilter轉向時,是沒有loginUrl資訊的,因此我們首先需要重新實現一個自己的認證過濾器,以下是我們自己的認證過濾器的程式碼:
/**
* @author xiaoxiao
* 日期:2013-8-7 上午11:23:02
* The default character set is UTF-8.
*/
package td.sso.filter;
import java.io.IOException;
import java.net.URL;
import java.net.URLEncoder;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import org.jasig.cas.client.authentication.DefaultGatewayResolverImpl;
import org.jasig.cas.client.authentication.GatewayResolver;
import org.jasig.cas.client.util.AbstractCasFilter;
import org.jasig.cas.client.util.CommonUtils;
import org.jasig.cas.client.validation.Assertion;
/**
* 遠端認證過濾器.
* 由於AuthenticationFilter的doFilter方法被宣告為final,
* 只好重新實現一個認證過濾器,支援localLoginUrl設定.
*/
public class RemoteAuthenticationFilter extends AbstractCasFilter {
public static final String CONST_CAS_GATEWAY = "_const_cas_gateway_";
/**
* 本地登陸頁面URL.
*/
private String localLoginUrl;
/**
* The URL to the CAS Server login.
*/
private String casServerLoginUrl;
/**
* Whether to send the renew request or not.
*/
private boolean renew = false;
/**
* Whether to send the gateway request or not.
*/
private boolean gateway = false;
protected void initInternal(final FilterConfig filterConfig) throws ServletException {
super.initInternal(filterConfig);
setCasServerLoginUrl(getPropertyFromInitParams(filterConfig, "casServerLoginUrl", null));
log.trace("Loaded CasServerLoginUrl parameter: " + this.casServerLoginUrl);
setLocalLoginUrl(getPropertyFromInitParams(filterConfig, "localLoginUrl", null));
log.trace("Loaded LocalLoginUrl parameter: " + this.localLoginUrl);
setRenew(Boolean.parseBoolean(getPropertyFromInitParams(filterConfig, "renew", "false")));
log.trace("Loaded renew parameter: " + this.renew);
setGateway(Boolean.parseBoolean(getPropertyFromInitParams(filterConfig, "gateway", "false")));
log.trace("Loaded gateway parameter: " + this.gateway);
}
public void init() {
super.init();
CommonUtils.assertNotNull(this.localLoginUrl, "localLoginUrl cannot be null.");
CommonUtils.assertNotNull(this.casServerLoginUrl, "casServerLoginUrl cannot be null.");
}
public final void doFilter(final ServletRequest servletRequest,
final ServletResponse servletResponse, final FilterChain filterChain)
throws IOException, ServletException {
System.out.println("呼叫RemoteAuthenticationFilter--->");
final HttpServletRequest request = (HttpServletRequest) servletRequest;
final HttpServletResponse response = (HttpServletResponse) servletResponse;
final HttpSession session = request.getSession(false);
final String ticket = request.getParameter(getArtifactParameterName());
final Assertion assertion = session != null ? (Assertion) session.getAttribute(CONST_CAS_ASSERTION) : null;
// final String serviceUrl = constructServiceUrl(request, response);
final boolean wasGatewayed = session != null && session.getAttribute(CONST_CAS_GATEWAY) != null;
// 如果訪問路徑為localLoginUrl且帶有validated引數則跳過
URL url = new URL(localLoginUrl);
final boolean isValidatedLocalLoginUrl = request.getRequestURI().endsWith(url.getPath()) &&
CommonUtils.isNotBlank(request.getParameter("validated"));
System.out.println(!isValidatedLocalLoginUrl && CommonUtils.isBlank(ticket) && assertion == null && !wasGatewayed);
if (!isValidatedLocalLoginUrl && CommonUtils.isBlank(ticket) && assertion == null && !wasGatewayed) {
log.debug("no ticket and no assertion found");
if (this.gateway) {
log.debug("setting gateway attribute in session");
request.getSession(true).setAttribute(CONST_CAS_GATEWAY, "yes");
}
final String serviceUrl = constructServiceUrl(request, response);
System.out.println(serviceUrl);
if (log.isDebugEnabled()) {
log.debug("Constructed service url: " + serviceUrl);
}
String urlToRedirectTo = CommonUtils.constructRedirectUrl(
this.casServerLoginUrl, getServiceParameterName(),
serviceUrl, this.renew, this.gateway);
System.out.println("RemoteAuthenticationFilter urlToRedirectTo\t"+urlToRedirectTo+",loginUrl\t"+localLoginUrl);
// 加入localLoginUrl
urlToRedirectTo += (urlToRedirectTo.contains("?") ? "&" : "?") + "loginUrl=" + URLEncoder.encode(localLoginUrl, "utf-8");
if (log.isDebugEnabled()) {
log.debug("redirecting to \"" + urlToRedirectTo + "\"");
}
response.sendRedirect(urlToRedirectTo);
return;
}
if (session != null) {
log.debug("removing gateway attribute from session");
session.setAttribute(CONST_CAS_GATEWAY, null);
}
filterChain.doFilter(request, response);
}
public final void setRenew(final boolean renew) {
this.renew = renew;
}
public final void setGateway(final boolean gateway) {
this.gateway = gateway;
}
public final void setCasServerLoginUrl(final String casServerLoginUrl) {
this.casServerLoginUrl = casServerLoginUrl;
}
public final void setLocalLoginUrl(String localLoginUrl) {
this.localLoginUrl = localLoginUrl;
}
}
以上黃色背景程式碼為修改部分,其餘程式碼均拷貝自org.jasig.cas.client.authentication.AuthenticationFilter,可以看到我們為原有的認證過濾器增加了一個引數localLoginUrl。在
applicationContext-cas.xml,將authenticationFilter指向的類換成我們的RemoteAuthenticationFilter,並新增localLoginUrl 引數
applicationContext-cas.xml:
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd
">
<context:property-placeholder location="classpath:cas-client.properties" />
<!-- 負責使用者的認證 -->
<bean name="authenticationFilter"
class="com.talkingdatawebsite.sso.filter.RemoteAuthenticationFilter">
<property name="localLoginUrl" value="${local.loginUrl}"></property>
<property name="casServerLoginUrl" value="${cas.server.loginUrl}" />
<property name="renew" value="${cas.server.renew}" />
<property name="gateway" value="${cas.server.gateway}" />
<property name="service" value="${cas.client.serverName}" />
</bean>
<!-- 對認證ticket進行校驗 -->
<bean name="ticketValidationFilter"
class="org.jasig.cas.client.validation.Cas20ProxyReceivingTicketValidationFilter">
<property name="service" value="${cas.client.serverName}" />
<property name="ticketValidator">
<bean class="org.jasig.cas.client.validation.Cas10TicketValidator">
<constructor-arg index="0" value="${cas.server.url}" />
</bean>
</property>
</bean>
</beans>
cas-client.properties:
cas.server.url=https://www.talkingdata.net:8446/
cas.server.loginUrl=https://www.talkingdata.net:8446/remoteLogin
local.loginUrl=http://localhost:8080/index.jsp
cas.client.serverName=http://localhost:8080/index.jsp
cas.server.renew=false
cas.server.gateway=false
最後來看看我們的登入頁面login.jsp:
<%@ page language="java" contentType="text/html; charset=utf-8"
pageEncoding="utf-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>遠端CAS客戶端登陸頁面</title>
<link rel="stylesheet" type="text/css"
href="<%=request.getContextPath()%>/styles/main.css" />
<script type="text/javascript">
function getParam(name) {
var queryString = window.location.search;
var param = queryString.substring(1, queryString.length).split("&");
for ( var i = 0; i < param.length; i++) {
var keyValue = param[i].split("=");
if (keyValue[0] == name){
return keyValue[1];
}
}
return null;
}
function init() {
// 顯示異常資訊
var error = getParam("errorMessage");
if (error) {
document.getElementById("errorMessage").innerHTML = decodeURIComponent(error);
}
// 注入service
var service = getParam("service");
if (service)
document.getElementById("service").value = decodeURIComponent(service);
// document.getElementById("service").value = service;
else
document.getElementById("service").value = location.href;
}
</script>
</head>
<body >
<h1>遠端CAS客戶端client1.1登陸頁面</h1>
<%
if (request.getRemoteUser() == null) {
%>
<div id="errorMessage"></div>
<form id="myLoginForm" action="https://www.talkingdata.net:8446/remoteLogin"
method="post">
<input type="hidden" id="service" name="service" value="">
<input type="hidden" name="loginUrl" value="http://localhost:8082/login.jsp">
<input type="hidden" name="loginsubmit" value="true" />
<table>
<tr>
<td>使用者名稱:</td>
<td><input type="text" id="username" name="username"></td>
</tr>
<tr>
<td>密 碼:</td>
<td><input type="password" id="password" name="password"></td>
</tr>
<tr>
<td colspan="2"><input type="submit" value="登陸" /></td>
</tr>
</table>
</form>
<script type="text/javascript">
init()
</script>
<%
} else {
%>
<div class="welcome">
您好:<%=request.getRemoteUser()%></div>
<div id="logout">
<a href="https://www.talkingdata.net:8446/logout?service=http://localhost:8082/">退出</a>
<a href="http://localhost:8081">我要去client1</a>
</div>
<%
}
%>
</body>
</html>
以上黃色背景字中,我們首先將表單action指向伺服器端remoteLogin,然後在裡面設定了兩個重要的hidden域以傳遞 loginUrl和submit引數,前者用於告訴伺服器失敗後轉向何處,後者告訴伺服器端webflow現在要進行提交而不是TGT認證請求。
這樣我們的自定義客戶端遠端登陸頁面就完成了,現在趕快測試一下吧~。