CAS实现SSO单点登录案例(整合SpringSecurity)

古城微笑少年丶 2022-03-26 02:24 455阅读 0赞

### CAS介绍 ###

`CAS是一个单点登录框架，由耶鲁大学的一个组织开发。CAS是一个开源项目，代码目前是在github上管理。单点登录：Single Sign On,简称SSO，SSO使得在多个应用系统中，用户只需要登录一次就可以访问所有相互信任的应用系统。通俗理解为一个应用登录了，其他被授权的应用不用再登录。之前也写过一篇sso单点登录,用redis实现的,有兴趣可以翻翻`  
cas下载地址:[https://github.com/apereo/cas/releases][https_github.com_apereo_cas_releases]

##### cas服务搭建 #####

我们案例下载使用的是CAS4.2,采用HTTPS协议处理用户请求。搭建HTTPS需要咱们生成对应的证书信息。当然也可以通过配置使其支持http协议,但毕竟http协议不安全,所以我们还是学一下如何搭建本地HTTPS服务.

###### 1.生成秘钥库 ######

keytool -genkey -alias shemuel -keyalg RSA -keystore E:/javaee/cas/keystory/shemeul
    其中-alias后面的是密钥库别名,最后的shemeul是要生成的密钥库文件.

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM1MjQ5MzQy_size_16_color_FFFFFF_t_70]  
命令运行后密钥库就生成了,接着就是导出这个密钥的证书,运行如下命令:

keytool -export -trustcacerts -alias shemuel -file E:/javaee/cas/keystory/shemuel.cer -keystore E:/javaee/cas/keystory/shemuel
    前面的路径是要导出证书的位置,后面的路径是之前密钥库的路径

将证书导入到JDK证书库  
刚才的操作会根据我们的秘钥库生成一个证书，紧接着我们需要将该证书导入到JDK的证书库里才能使用。

keytool -import -trustcacerts -alias shemuel -file E:/javaee/cas/keystory/shemuel.cer -keystore "F:/Java/jdk1.8.0_131/jre/lib/security/cacerts"

要求输入密钥库口令:**注意这个密钥库是jdk的密钥库,口令密码为:changeit**

##### 2.tomcat发布cas服务端项目 #####

在githib上下载cas服务端项目 [https://github.com/apereo/cas/releases][https_github.com_apereo_cas_releases]

*  解压一个tomcat，放到D:\\workspace\\cas\\目录下，把刚才我们下载的cas解压打开target目录下有个cas.war 拷贝到tomcat的webapps目录并解压，删除war包。
 *  下载的cas解压目录下还有一个文件target\\war\\work\\org.jasig.cas\\cas-server-webapp\\WEB-INF\\cas.properties，把他拷贝到webapps\\cas\\WEB-INF目录下。
 *  修改spring-configuration\\propertyFileConfigurer.xml，把location="file:/etc/cas/cas.properties"换成刚才cas.properties的绝对路径。

<util:properties id="casProperties" location="file:D:/workspace/cas/apache-tomcat-8.5.16/webapps/cas/WEB-INF/cas.properties" />

修改tomcat的conf/server.xml，加入如下代码

启动tomcat, bin目录下的 startup.bat

访问 [https://shemuel:8443/cas/login][https_shemuel_8443_cas_login]  
我这里的本地hosts配置了 127.0.0.1 对应 shemuel了,有兴趣也可以配置一下.  
访问后可能出现浏览器安全提示,因为我们的证书是本地的,没交钱所以会出现警告,添加个例外继续访问,看到如下界面就说明成功了  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM1MjQ5MzQy_size_16_color_FFFFFF_t_70 1]  
**登录名:casuser 密码:Mellon**  
这是cas自带的一个登录用户,我们可以配置数据库信息,使用我们自己的数据库表用户登录

##### 3.配置cas数据库连接池 #####

*  打开webapps\\cas\\WEB-INF\\deployerConfigContext.xml
 *  把32行的`<alias name="acceptUsersAuthenticationHandler" alias="primaryAuthenticationHandler" />` 注释掉。
 *  将如下代码拷贝到deployerConfigContext.xml中

<bean id="MD5PasswordEncoder" class="org.jasig.cas.authentication.handler.DefaultPasswordEncoder" autowire="byName">
    			<constructor-arg  value="MD5"/>
    		</bean>
    		
    		
    		<bean id="queryDatabaseAuthenticationHandler" name="primaryAuthenticationHandler" class="org.jasig.cas.adaptors.jdbc.QueryDatabaseAuthenticationHandler">
    			<property name="passwordEncoder" ref="MD5PasswordEncoder"/>
    		</bean>
    		
    		
    		<alias name="dataSource" alias="queryDatabaseDataSource"/>
    		
    		
    		<bean id="dataSource"
    				class="com.mchange.v2.c3p0.ComboPooledDataSource"
    				p:driverClass="com.mysql.jdbc.Driver"
    				p:jdbcUrl="jdbc:mysql://127.0.0.1:3306/springsecurity?useUnicode=true&characterEncoding=UTF-8&zeroDateTimeBehavior=convertToNull"
    				p:user="root"
    				p:password="123456"
    				p:initialPoolSize="6"
    				p:minPoolSize="6"
    				p:maxPoolSize="18"
    				p:maxIdleTimeExcessConnections="120"
    				p:checkoutTimeout="10000"
    				p:acquireIncrement="6"
    				p:acquireRetryAttempts="5"
    				p:acquireRetryDelay="2000"
    				p:idleConnectionTestPeriod="30"
    				p:preferredTestQuery="select 1"/>

*  把如下jar包拷贝到lib下  
    ![在这里插入图片描述][20190115101131270.png]
 *  配置查询语句

修改cas.properties 220行，去掉注释，修改如下：
    
        cas.jdbc.authn.query.sql=select password from users where username=?

由于此时我们指定的加密算法为md5了，所以我们需要重新增加一条md5加密的数据到数据库去。

INSERT INTO users(username,password,enabled)VALUES('itheima',(SELECT MD5('123456')),'true');

重启tomcat，用itheima登录成功。

#### CSA实现单点登录功能 ####

新建一个maven工程，配置一下CAS相关过滤器，然后访问首页。  
**pom依赖**

<dependency>
          <groupId>org.jasig.cas.client</groupId>
          <artifactId>cas-client-core</artifactId>
          <version>3.3.3</version>
        </dependency>
        <dependency>
    			<groupId>javax.servlet</groupId>
    			<artifactId>servlet-api</artifactId>
    			<version>2.5</version>
    			<scope>provided</scope>
    	</dependency>
    	<build>
    		<plugins>
    			
    			<plugin>
    				<groupId>org.apache.tomcat.maven</groupId>
    				<artifactId>tomcat7-maven-plugin</artifactId>
    				<configuration>
    					<port>70</port>
    					
    					<path>/</path>
    				</configuration>
    			</plugin>
    
    			<plugin>
    				<groupId>org.apache.maven.plugins</groupId>
    				<artifactId>maven-compiler-plugin</artifactId>
    				<version>3.1</version>
    				<configuration>
    					<source>1.8</source>
    					<target>1.8</target>
    				</configuration>
    			</plugin>
    		</plugins>
    	</build>

**web.xml**

<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>
      </filter>
      <filter-mapping>
        <filter-name>CAS Single Sign Out Filter</filter-name>
        <url-pattern>/*</url-pattern>
      </filter-mapping>
    
      
      <filter>
        <filter-name>CASFilter</filter-name>
        <filter-class>org.jasig.cas.client.authentication.AuthenticationFilter</filter-class>
        <init-param>
          <param-name>casServerLoginUrl</param-name>
           
          <param-value>https://shemuel:8443/cas/login</param-value>
         
        </init-param>
        <init-param>
          <param-name>serverName</param-name>
          <param-value>http://shemuel:70</param-value>
        </init-param>
      </filter>
      <filter-mapping>
        <filter-name>CASFilter</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>
        <init-param>
          <param-name>casServerUrlPrefix</param-name>
          <param-value>https://shemuel:8443/cas</param-value>
        </init-param>
        <init-param>
          <param-name>serverName</param-name>
          <param-value>http://shemuel:70</param-value>
        </init-param>
      </filter>
      <filter-mapping>
        <filter-name>CAS Validation Filter</filter-name>
        <url-pattern>/*</url-pattern>
      </filter-mapping>
      
      <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 HttpServletRequest Wrapper Filter</filter-name>
        <url-pattern>/*</url-pattern>
      </filter-mapping>
    
      
      <filter>
        <filter-name>CAS Assertion Thread Local Filter</filter-name>
        <filter-class>org.jasig.cas.client.util.AssertionThreadLocalFilter</filter-class>
      </filter>
      <filter-mapping>
        <filter-name>CAS Assertion Thread Local Filter</filter-name>
        <url-pattern>/*</url-pattern>
      </filter-mapping>

tomcat运行，端口70,出现如下报错  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM1MjQ5MzQy_size_16_color_FFFFFF_t_70 2]  
上面错误的原因是因为CAS默认值接受HTTPS有IMAPS协议请求的认证，我们需要把HTTP也给加上去。

打开下载的cas项目: cas\\WEB-INF\\classes\\services\\HTTPSandIMAPS-10000001.json，修改第3行  
`"serviceId" : "^(https|imaps)://.*",`

改成

"serviceId" : "^(https|imaps|http)://.*",

保存，并重新启动即可。

#### 拷贝casclient-demo1 模拟两个客户端 ####

拷贝casclien-demo1 改名casclient-demo2 部署，tomcat端口18083，进行单点测试。一个站点登录后另外一个站点就不需要登录了。  
如果运营一旦出现如下错误，请调整tomcat的JDK，和生成秘钥的JDK保持一致，不要用SDK即可。

java.lang.RuntimeException: javax.net.ssl.SSLHandshakeException: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
    	org.jasig.cas.client.util.CommonUtils.getResponseFromServer(CommonUtils.java:407)
    	org.jasig.cas.client.validation.AbstractCasProtocolUrlBasedTicketValidator.retrieveResponseFromServer(AbstractCasProtocolUrlBasedTicketValidator.java:45)
    	org.jasig.cas.client.validation.AbstractUrlBasedTicketValidator.validate(AbstractUrlBasedTicketValidator.java:200)
    	org.jasig.cas.client.validation.AbstractTicketValidationFilter.doFilter(AbstractTicketValidationFilter.java:206)
    	org.jasig.cas.client.authentication.AuthenticationFilter.doFilter(AuthenticationFilter.java:161)
    	org.jasig.cas.client.session.SingleSignOutFilter.doFilter(SingleSignOutFilter.java:100)
    
    	Root Cause
    	
    	javax.net.ssl.SSLHandshakeException: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
    		sun.security.ssl.Alerts.getSSLException(Alerts.java:192)
    		sun.security.ssl.SSLSocketImpl.fatal(SSLSocketImpl.java:1949)
    		sun.security.ssl.Handshaker.fatalSE(Handshaker.java:302)
    		sun.security.ssl.Handshaker.fatalSE(Handshaker.java:296)
    		sun.security.ssl.ClientHandshaker.serverCertificate(ClientHandshaker.java:1509)
    		sun.security.ssl.ClientHandshaker.processMessage(ClientHandshaker.java:216)
    		sun.security.ssl.Handshaker.processLoop(Handshaker.java:979)
    		sun.security.ssl.Handshaker.process_record(Handshaker.java:914)
    		sun.security.ssl.SSLSocketImpl.readRecord(SSLSocketImpl.java:1062)
    		sun.security.ssl.SSLSocketImpl.performInitialHandshake(SSLSocketImpl.java:1375)
    		sun.security.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:1403)
    		sun.security.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:1387)
    		sun.net.www.protocol.https.HttpsClient.afterConnect(HttpsClient.java:559)
    		sun.net.www.protocol.https.AbstractDelegateHttpsURLConnection.connect(AbstractDelegateHttpsURLConnection.java:185)
    		sun.net.www.protocol.http.HttpURLConnection.getInputStream0(HttpURLConnection.java:1513)
    		sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1441)
    		sun.net.www.protocol.https.HttpsURLConnectionImpl.getInputStream(HttpsURLConnectionImpl.java:254)
    		org.jasig.cas.client.util.CommonUtils.getResponseFromServer(CommonUtils.java:393)
    		org.jasig.cas.client.validation.AbstractCasProtocolUrlBasedTicketValidator.retrieveResponseFromServer(AbstractCasProtocolUrlBasedTicketValidator.java:45)
    		org.jasig.cas.client.validation.AbstractUrlBasedTicketValidator.validate(AbstractUrlBasedTicketValidator.java:200)
    		org.jasig.cas.client.validation.AbstractTicketValidationFilter.doFilter(AbstractTicketValidationFilter.java:206)
    		org.jasig.cas.client.authentication.AuthenticationFilter.doFilter(AuthenticationFilter.java:161)
    		org.jasig.cas.client.session.SingleSignOutFilter.doFilter(SingleSignOutFilter.java:100)
    	
    	Root Cause
    	
    	sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
    		sun.security.validator.PKIXValidator.doBuild(PKIXValidator.java:387)
    		sun.security.validator.PKIXValidator.engineValidate(PKIXValidator.java:292)
    		sun.security.validator.Validator.validate(Validator.java:260)
    		sun.security.ssl.X509TrustManagerImpl.validate(X509TrustManagerImpl.java:324)
    		sun.security.ssl.X509TrustManagerImpl.checkTrusted(X509TrustManagerImpl.java:229)
    		sun.security.ssl.X509TrustManagerImpl.checkServerTrusted(X509TrustManagerImpl.java:124)
    		sun.security.ssl.ClientHandshaker.serverCertificate(ClientHandshaker.java:1491)
    		sun.security.ssl.ClientHandshaker.processMessage(ClientHandshaker.java:216)
    		sun.security.ssl.Handshaker.processLoop(Handshaker.java:979)
    		sun.security.ssl.Handshaker.process_record(Handshaker.java:914)
    		sun.security.ssl.SSLSocketImpl.readRecord(SSLSocketImpl.java:1062)
    		sun.security.ssl.SSLSocketImpl.performInitialHandshake(SSLSocketImpl.java:1375)
    		sun.security.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:1403)
    		sun.security.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:1387)
    		sun.net.www.protocol.https.HttpsClient.afterConnect(HttpsClient.java:559)
    		sun.net.www.protocol.https.AbstractDelegateHttpsURLConnection.connect(AbstractDelegateHttpsURLConnection.java:185)
    		sun.net.www.protocol.http.HttpURLConnection.getInputStream0(HttpURLConnection.java:1513)
    		sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1441)
    		sun.net.www.protocol.https.HttpsURLConnectionImpl.getInputStream(HttpsURLConnectionImpl.java:254)
    		org.jasig.cas.client.util.CommonUtils.getResponseFromServer(CommonUtils.java:393)
    		org.jasig.cas.client.validation.AbstractCasProtocolUrlBasedTicketValidator.retrieveResponseFromServer(AbstractCasProtocolUrlBasedTicketValidator.java:45)
    		org.jasig.cas.client.validation.AbstractUrlBasedTicketValidator.validate(AbstractUrlBasedTicketValidator.java:200)
    		org.jasig.cas.client.validation.AbstractTicketValidationFilter.doFilter(AbstractTicketValidationFilter.java:206)
    		org.jasig.cas.client.authentication.AuthenticationFilter.doFilter(AuthenticationFilter.java:161)
    		org.jasig.cas.client.session.SingleSignOutFilter.doFilter(SingleSignOutFilter.java:100)

cas服务端和两个客户端都启动后,我们访问其中一个客户端登录后,另一个客户端就不需要登录了说明成功!  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM1MjQ5MzQy_size_16_color_FFFFFF_t_70 3]  
至此简易的单点登录系统就完成了,后面会介绍springsecurity 如何整合cas

参考:传智播客教学视频  
传智播客官网: [http://itcast.cn][http_itcast.cn]

[https_github.com_apereo_cas_releases]: https://github.com/apereo/cas/releases
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM1MjQ5MzQy_size_16_color_FFFFFF_t_70]: /images/20220326/b3c34f3b5141461ba6d957940fc8032c.png
[https_shemuel_8443_cas_login]: https://shemuel:8443/cas/login
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM1MjQ5MzQy_size_16_color_FFFFFF_t_70 1]: /images/20220326/ad3b22006eb0472e932c2a91dec5e5b6.png
[20190115101131270.png]: /images/20220326/b2913edf7e74419f8ada08f90dd6eed3.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM1MjQ5MzQy_size_16_color_FFFFFF_t_70 2]: /images/20220326/591faad656c44e1cab81185d41cf75f8.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM1MjQ5MzQy_size_16_color_FFFFFF_t_70 3]: /images/20220326/c417e7ae3c4347cfb42e497a2f7883d8.png
[http_itcast.cn]: http://itcast.cn