CAS (5) —— Nginx代理模式下浏览器访问CAS服务器配置详解

http://www.cnblogs.com/richaaaard/p/5053108.html

---

tomcat版本: tomcat-8.0.29

jdk版本: jdk1.8.0_65

nginx版本: nginx-1.9.8

cas版本: cas4.1.2
cas-client-3.4.1

参考来源:

jasig.github.io:CAS protocol

https://github.com/Jasig/java-cas-client

通过Proxy访问其它Cas应用

CAS负载均衡配置——SSL篇

CAS负载均衡配置

CAS客户端集群

• 以下的示例采用我博客的另外两篇文章中搭建好的测试环境举例

CAS (1) —— Mac下配置CAS到Tomcat（服务端）

CAS (2) —— Mac下配置CAS到Tomcat（客户端）

CAS (3) —— Mac下配置CAS客户端经代理访问Tomcat CAS

Mac为nginx安装nginx-sticky-module

【高可用HA】Nginx (1) —— Mac下配置Nginx Http负载均衡(Load Balancer)之101实例

Nginx (2) —— Mac下配置Apache Httpd的Https/SSL （待出）

目标架构

此代理非彼代理

在CAS官方网站上给出了一个“Proxy Web Flow Diagram”：

顺序图：(来源于http://jasig.github.io/cas/4.0.x/protocol/CAS-Protocol.html)

这个方案主要适用一种场景：

有两个应用App1和App2，它们都是受Cas Server保护的，即请求它们时都需要通过Cas Server的认证。现需要在App1中通过Http请求访问App2，显然该请求将会被App2配置的Cas的AuthenticationFilter拦截并转向Cas Server，Cas Server将引导用户进行登录认证，这样我们也就不能真正的访问到App2了。针对这种应用场景，Cas也提供了对应的支持。通过Proxy访问其它Cas应用

无论是用中文关键字在“度娘”，还是用英文关键字再“谷哥”上搜索，多数文章都是描述上面这样一个场景。

而我这里介绍的“代理”，并非是上述场景——依靠代理去验证ticket，“代理”在此的角色是：

• 只做分发反向代理（未来的负载均衡器）

* 注意：所以说“此代理非彼代理”

准备

要搭建上面这个环境会相对复杂，我们需要参照之前的文章准备以下必备的组件或环境：

1. 2个Tomcat服务器作为客户端应用程序服务器（即cas的客户端）

   app1.hoau.com:8081/8413(http/https)app2.hoau.com:8082/8423(http/https)

   参照Tomcat Cluster、Tomcat SSL和CAS Client

2. 1个配置好SSL的Nginx服务器作为中间层代理转发服务器（后可扩展为LoadBalancer）

   proxy.sso.hoau.com:85/443(http/https)

   参照Nginx Load Balancer与Nginx Sticky Session

3. 另一个1个带有SSL的Tomcat服务器作为CAS服务器

   sso.hoau.com:8083/8433(http/https)

   参照Tomcat SSL与CAS Server

关键配置

• 代理服务器（Nginx x 1）

  nginx.conf

  • http

    server:

    server {    listen       85;    server_name  proxy.sso.hoau.com;    location / {      #index index.html index.htm;    #设置主机头和客户端真实地址，以便服务器获取客户端真实IP    proxy_set_header   Host   $host;    proxy_set_header   Referer $http_referer;    proxy_set_header   Cookie $http_cookie;    proxy_set_header   X-Real-IP  $remote_addr;    proxy_set_header   X-Forwarded-For              $proxy_add_x_forwarded_for;    proxy_redirect off;      #禁用缓存    #proxy_buffering off;    proxy_connect_timeout 3;    proxy_send_timeout 30;    proxy_read_timeout 30;     proxy_pass http://cas_server_http; }  

    upstream:

    upstream cas_server_http {      #根据ip计算将请求分配各那个后端tomcat，许多人误认为可以解决session问题，其实并不能。      #同一机器在多网情况下，路由切换，ip可能不同      #ip_hash;       #sticky;    #Richard: http    server localhost:8083 weight=1 srun_id=c;     #server localhost:8084 weight=1 srun_id=c;     jvm_route $cookie_JSESSIONID|sessionid reverse;}

    *注意：

    （1）以上的“jvm_route $cookie_JSESSIONID|sessionid reverse;”是关键配置，因为CAS是依赖于Session和Cookie进行身份验证的。

    （2）srun_id=c，其中“c”需要与CAS服务器Tomcat server.xml文件里的jvmRoute配置“

    <Engine name="Catalina" defaultHost="localhost" jvmRoute="c">”    

  • https

    server:

    server {     listen 443;    server_name  proxy.sso.hoau.com;    ssl on;     ssl_certificate /Users/Richard/Documents/Dev/servers/cluster/nginx/keys/server.crt;     ssl_certificate_key  /Users/Richard/Documents/Dev/servers/cluster/nginx/keys/server.key;     ssl_session_timeout 5m;    ssl_protocols SSLv3 TLSv1;    ssl_ciphers ALL:!ADH:!EXPORT56:RC4+RSA:+HIGH:+MEDIUM:+LOW:+SSLv2:+EXP;    ssl_prefer_server_ciphers on;    location / {        proxy_redirect off;          proxy_set_header Host $host;          proxy_set_header   Referer $http_referer;        proxy_set_header   Cookie $http_cookie;        proxy_set_header X-Real-IP $remote_addr;          proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;        proxy_set_header X-FORWARDED-HOST $server_addr;          proxy_set_header X-FORWARDED-PORT $server_port;        proxy_connect_timeout 3;        proxy_send_timeout 30;        proxy_read_timeout 30;        proxy_pass https://cas_server_ssl;    }   }

    *注意：以上的ssl为关键配置“ssl_certificate”和“ssl_certificate_key”需要指向正确的证书和密钥。

    upstream：

    upstream cas_server_ssl {      #Richard: https todo    server sso.hoau.com:8433 weight=1 srun_id=c;      #server sso.hoau.com:8443 weight=1 srun_id=c;     jvm_route $cookie_JSESSIONID|sessionid reverse;}  

*注意：以上http和https可以只配一项，或两者兼存皆可，端口不要冲突。

• CAS客户端应用服务器（Tomcat x 2）

  以下客户端的蓝本可以在github上收到（关键字：“cas-sample-java-webapp”），我这里只贴出自己的关键点和修改后的结果。

  CAS客户端的应用服务器有两台，如果不使用Spring Security的集成，比较关键配置就只有pom.xml（编译）和web.xml（部署）：

  • 两个环境编译类似，pom.xml（贴全了，有无冗余请自行解决）：

    *注意：以下Spring Security相关依赖为非必须

    <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">    <modelVersion>4.0.0</modelVersion>    <groupId>iamlabs.unicon.net</groupId>    <artifactId>cas-sample-java-webapp</artifactId>    <version>0.0.1-SNAPSHOT</version>    <packaging>war</packaging>    <name>CAS Example Java Web App</name>    <description>A sample web application that exercises the CAS protocol features via the Java CAS Client.</description>    <build>        <finalName>cas-sample-java-webapp</finalName>        <plugins>            <plugin>                <groupId>org.apache.maven.plugins</groupId>                <artifactId>maven-compiler-plugin</artifactId>                <version>2.5.1</version>                <configuration>                    <source>1.7</source>                    <target>1.7</target>                </configuration>            </plugin>        </plugins>    </build>    <properties>               <spring.version>3.2.4.RELEASE</spring.version>         <casclient.version>3.4.1</casclient.version>            </properties>      <dependencies>    <dependency>        <groupId>commons-logging</groupId>        <artifactId>commons-logging</artifactId>        <version>1.1.1</version>    </dependency>    <!-- Logging -->        <dependency>          <groupId>org.slf4j</groupId>          <artifactId>slf4j-api</artifactId>          <version>1.7.13</version>      </dependency>      <dependency>          <groupId>org.slf4j</groupId>          <artifactId>slf4j-simple</artifactId>          <version>1.7.13</version>      </dependency>        <dependency>            <groupId>org.slf4j</groupId>            <artifactId>slf4j-log4j12</artifactId>            <version>1.7.13</version>       </dependency>     <dependency>        <groupId>org.opensaml</groupId>        <artifactId>opensaml1</artifactId>        <version>1.1</version>    </dependency>    <dependency>        <groupId>javax.servlet</groupId>        <artifactId>javax.servlet-api</artifactId>        <version>3.1.0</version>        <scope>provided</scope>    </dependency>    <dependency>        <groupId>org.jasig.cas.client</groupId>        <artifactId>cas-client-core</artifactId>        <version>${casclient.version}</version>        <exclusions>            <exclusion>                <groupId>javax.servlet</groupId>                <artifactId>servlet-api</artifactId>            </exclusion>        </exclusions>    </dependency>    <dependency>        <groupId>org.jasig.cas.client</groupId>        <artifactId>cas-client-integration-tomcat-common</artifactId>        <version>${casclient.version}</version>    </dependency>    <dependency>        <groupId>commons-codec</groupId>        <artifactId>commons-codec</artifactId>        <version>1.6</version>    </dependency>    <dependency>        <groupId>org.apache.santuario</groupId>        <artifactId>xmlsec</artifactId>        <version>1.4.3</version>    </dependency>    <dependency>          <groupId>org.springframework</groupId>          <artifactId>spring-core</artifactId>          <version>${spring.version}</version>      </dependency>      <dependency>          <groupId>org.springframework</groupId>          <artifactId>spring-beans</artifactId>          <version>${spring.version}</version>      </dependency>      <dependency>          <groupId>org.springframework</groupId>          <artifactId>spring-context</artifactId>          <version>${spring.version}</version>      </dependency>      <dependency>          <groupId>org.springframework</groupId>          <artifactId>spring-web</artifactId>          <version>${spring.version}</version>      </dependency>      <dependency>         <groupId>org.springframework.security</groupId>        <artifactId>spring-security-core</artifactId>        <version>${spring.version}</version>      </dependency>    <dependency>        <groupId>org.springframework.security</groupId>        <artifactId>spring-security-web</artifactId>        <version>${spring.version}</version>      </dependency>      <dependency>          <groupId>org.springframework.security</groupId>        <artifactId>spring-security-config</artifactId>          <version>${spring.version}</version>      </dependency>      </dependencies></project>

  • https://app1.hoau.com:8413

    web.xml:

    <?xml version="1.0" encoding="UTF-8"?><web-app version="2.4" xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"    xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">     <context-param>        <param-name>log4jConfigLocation</param-name>        <param-value>/WEB-INF/log4j.properties</param-value>    </context-param>    <listener>        <listener-class>org.springframework.web.util.Log4jConfigListener</listener-class>    </listener>    <!--    <listener>        <listener-class>org.jasig.cas.client.session.SingleSignOutHttpSessionListener</listener-class>    </listener>    <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://proxy.sso.hoau.com:443</param-value>        </init-param>    </filter>    <filter-mapping>        <filter-name>CAS Single Sign Out Filter</filter-name>        <url-pattern>/*</url-pattern>    </filter-mapping>    -->    <filter>        <filter-name>CAS Validation Filter</filter-name>        <filter-class>org.jasig.cas.client.validation.Cas20ProxyReceivingTicketValidationFilter</filter-class>        <!--         <filter-class>org.jasig.cas.client.validation.Saml11TicketValidationFilter</filter-class>         -->         <!--         <filter-class>org.jasig.cas.client.validation.Cas20ProxyReceivingTicketValidationFilter</filter-class>          -->     <init-param>        <param-name>casServerUrlPrefix</param-name>        <!--        <param-value>https://sso.hoau.com:8433/cas</param-value>        <param-value>https://proxy.sso.hoau.com:443/cas</param-value>        -->        <param-value>https://proxy.sso.hoau.com:443/cas</param-value>    </init-param>    <!---->    <init-param>        <param-name>serverName</param-name>        <param-value>https://app1.hoau.com:8413</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>acceptAnyProxy</param-name>        <param-value>true</param-value>    </init-param>    <!--     <init-param>        <param-name>ticketValidatorClass</param-name>        <param-value>org.jasig.cas.client.validation.Cas20ProxyTicketValidator</param-value>    </init-param>    -->    <!-- http://haohaoxuexi.iteye.com/blog/2145751    <init-param>        <param-name>proxyReceptorUrl</param-name>        <param-value>/proxyCallback</param-value>    </init-param>    <init-param>        <param-name>proxyCallbackUrl</param-name>        <param-value>https://app1.hoau.com:8413/cas1/proxyCallback</param-value>    </init-param>    --></filter><filter>    <filter-name>CAS Authentication Filter</filter-name>    <filter-class>org.jasig.cas.client.authentication.AuthenticationFilter</filter-class>    <!--     <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://sso.hoau.com:8433/cas/login</param-value>        -->         <param-value>https://proxy.sso.hoau.com:443/cas/login</param-value>    </init-param>    <init-param>        <param-name>serverName</param-name>        <param-value>https://app1.hoau.com:8413</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 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><!--<servlet>    <servlet-name>ProxyValidate</servlet-name>    <servlet-class> edu.yale.its.tp.cas.servlet.ProxyValidate</servlet-class></servlet><servlet>     <servlet-name>ProxyTicketReceptor</servlet-name>     <servlet-class>edu.yale.its.tp.cas.proxy.ProxyTicketReceptor</servlet-class> </servlet > <servlet-mapping>     <servlet-name>ProxyTicketReceptor</servlet-name>     <url-pattern>/CasProxyServlet </url-pattern> </servlet-mapping >--><welcome-file-list>    <welcome-file>        index.jsp    </welcome-file></welcome-file-list></web-app>

    *注意：

    • “CAS Validation Filter”需要放在“CAS Authentication Filter”之前

    • 此代理非彼代理

    网上一些文章说的需要配置诸如：

    1. “SingleSignOutHttpSessionListener”
    2. “SingleSignOutFilter”
    3. “ticketValidatorClass”
    4. “ProxyValidate”
    5. “ProxyTicketReceptor”

    均不需要

    • 如果误配了SingleSignOutFilter，会出现异常

      Caused by: java.io.IOException: Server returned HTTP response code: 500 for URL: https://proxy.sso.hoau.com:443/cas/proxyValidate?ticket=ST-31-TM9EbFoQbasNdXh11HaJ-cas01.sso.hoau.com&service=https%3A%2F%2Fapp2.hoau.com%3A8423%2Fcas2%3Bjsessionid%3D0CEB865B53E64FF31BF02A496DF73860.tomcat2

      at sun.net.www.protocol.http.HttpURLConnection.getInputStream0(HttpURLConnection.java:1840)  at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1441)  at sun.net.www.protocol.https.HttpsURLConnectionImpl.getInputStream(HttpsURLConnectionImpl.java:254)  at org.jasig.cas.client.util.CommonUtils.getResponseFromServer(CommonUtils.java:429)  ... 24 more

* https://app2.hoau.com:8423        web.xml配置同上    >*注意：修改端口   

• CAS服务器（Tomcat x 1）

  • 服务端https://sso.hoau.com:8433

    *注意：

    系列文章CAS (1) —— Mac下配置CAS到Tomcat（服务端）中介绍服务端配置也无需任何修改。

    以下配置：

    1. “Proxy (PGT acquisition)”
    2. “Modern proxy-service validation”

    均不需要

测试

*1. 访问“https://app1.hoau.com:8413/cas1”

会重定向到“https://proxy.sso.hoau.com/cas/login?service=https%3A%2F%2Fapp1.hoau.com%3A8413%2Fcas1”

*2. 然后输入用户明密码（test01/psw01）

如果验证成功，则会将浏览器重定向到app1的登陆成功页面。

*3. 再次访问“https://app1.hoau.com:8413/cas1”

可以直接进入登陆成功页，而无需输入用户名密码。

*4. 访问另一应用

同样可以通过test01用户直接进入登陆成功页，而无需输入用户名密码。

代理下的网络顺序分析

参照另一文章：（待出）

源代码

还在准备，如果需要的童鞋请留言。