spring-security（八）java config-sample之cas client

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前言：
  SSO英文全称Single Sign On，单点登录。SSO是在多个应用系统中，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。它包括可以将这次主要的登录映射到其他应用中用于同一个用户的登录的机制。它是目前比较流行的企业业务整合的解决方案之一。CAS是一个开源的企业级SSO具体实现，spring security也提供了和SSO的集成，本文用一个简单示例演示下如何在spring security中利用cas，为了简单起见，本文利用http来访问cas server，关于如何搭建支持http协议的cas server可以参照
Overlay-Cas server搭建
环境：
  spring boot 版本：1.5.4.RELEASE

1.项目结构




2.配置类SecurityConfig.java

/**
 * 
 */
package falcon.chengf.security.samples.javaconfig.cas.client;

import org.jasig.cas.client.validation.Cas20ServiceTicketValidator;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Bean;
import org.springframework.security.cas.ServiceProperties;
import org.springframework.security.cas.authentication.CasAssertionAuthenticationToken;
import org.springframework.security.cas.authentication.CasAuthenticationProvider;
import org.springframework.security.cas.web.CasAuthenticationEntryPoint;
import org.springframework.security.cas.web.CasAuthenticationFilter;
import org.springframework.security.config.annotation.web.builders.HttpSecurity;
import org.springframework.security.config.annotation.web.configuration.EnableWebSecurity;
import org.springframework.security.config.annotation.web.configuration.WebSecurityConfigurerAdapter;
import org.springframework.security.core.userdetails.User;
import org.springframework.security.core.userdetails.UserDetailsByNameServiceWrapper;
import org.springframework.security.core.userdetails.UserDetailsService;
import org.springframework.security.provisioning.InMemoryUserDetailsManager;
import org.springframework.security.web.AuthenticationEntryPoint;

/**
 * @author: 作者： chengaofeng
 * @date: 创建时间：2018-01-05 09:09:21
 * @Description: TODO
 * @version V1.0
 */
@EnableWebSecurity
public class SecurityConfig extends WebSecurityConfigurerAdapter {

	@Bean
	public UserDetailsService userDetailsService() {
		InMemoryUserDetailsManager manager = new InMemoryUserDetailsManager();
		// cas server默认用户名和密码 casuser::Mellon
		manager.createUser(User.withUsername("casuser").password("Mellon").roles("USER").build());
		return manager;
	}

	@Bean
	public ServiceProperties serviceProperties() {
		ServiceProperties serviceProperties = new ServiceProperties();
		// 路径固定，client端ip:端口/login/cas,是CasAuthenticationFilter默认监听的地址
		serviceProperties.setService("http://localhost:8089/login/cas");
		serviceProperties.setSendRenew(false);
		return serviceProperties;
	}

	@Bean
	public AuthenticationEntryPoint casEntryPoint() {
		CasAuthenticationEntryPoint casEntryPoint = new CasAuthenticationEntryPoint();
		// cas-server 对应的login地址
		casEntryPoint.setLoginUrl("http://localhost:8080/cas-server/cas/login");
		casEntryPoint.setServiceProperties(serviceProperties());
		return casEntryPoint;
	}

	@Bean
	public CasAuthenticationFilter casFilter() throws Exception {
		CasAuthenticationFilter casFilter = new CasAuthenticationFilter();
//		casFilter.setFilterProcessesUrl("/**");
		casFilter.setAuthenticationManager(authenticationManager());
		return casFilter;
	}

	@Override
	protected void configure(HttpSecurity http) throws Exception {
		http.csrf().disable()
			.authorizeRequests()
				.anyRequest().hasRole("USER").and()
			.exceptionHandling()
				.authenticationEntryPoint(casEntryPoint()).and()
			.addFilter(casFilter())
			.authenticationProvider(casAuthenticationProvider());
	}

	@Bean
	@Autowired
	public CasAuthenticationProvider casAuthenticationProvider() {
		CasAuthenticationProvider casAuthenticationProvider = new CasAuthenticationProvider();
		casAuthenticationProvider.setAuthenticationUserDetailsService(userDetailsByNameServiceWrapper());
		casAuthenticationProvider.setServiceProperties(serviceProperties());
		casAuthenticationProvider.setTicketValidator(ticketValidator());
		casAuthenticationProvider.setKey("an_id_for_this_auth_provider_only");
		return casAuthenticationProvider;
	}

	@Bean
	public Cas20ServiceTicketValidator ticketValidator() {
		// cas server 服务的context path
		Cas20ServiceTicketValidator ticketValidator = new Cas20ServiceTicketValidator("http://localhost:8080/cas-server");
//		ticketValidator.setEncoding("UTF-8");
		return ticketValidator;
	}

	@Bean
	public UserDetailsByNameServiceWrapper userDetailsByNameServiceWrapper() {
		UserDetailsByNameServiceWrapper userDetailsByNameServiceWrapper = new UserDetailsByNameServiceWrapper(
				userDetailsService());
		return userDetailsByNameServiceWrapper;
	}

}

3.启动类CasClientApp.java

package falcon.chengf.security.samples.javaconfig.cas.client;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

/**
 * Hello world!
 *
 */
@SpringBootApplication
public class CasClientApp 
{
    public static void main( String[] args )
    {
        SpringApplication.run(CasClientApp.class, args);
    }
}

4.项目配置文件application.yml

server:
  port: 8089

因为要启动cas server，用的是8080端口，此处只是将client服务的端口修改成了8089
5.项目pom文件

	4.0.0

	falcon.chengf
	security-samples-javaconfig-cas-client
	0.0.1-SNAPSHOT
	jar

	security-samples-javaconfig-cas-client
	http://maven.apache.org

	
		UTF-8
	
	

		
			
				org.springframework.boot
				spring-boot-starter-parent
				1.5.4.RELEASE
				pom
				import
			
		
	
	
		
			junit
			junit
			test
		
		
			org.springframework.boot
			spring-boot-starter-web
		
		
			org.springframework.security
			spring-security-config
		
		
			org.springframework.security
			spring-security-web
		

		
			org.springframework.security
			spring-security-cas
		
	
	
		
			
				org.springframework.boot
				spring-boot-maven-plugin
				
					
						
							repackage
						
					
				
				
					${start-class}
				
			
		
	

相比单纯的spring security文件，这里只是多追加了spring-security-cas依赖
6.项目默认欢迎页index.html

	hello cas!

7.启动项目
选中启动类，选择 Run As->Java application,启动后在浏览器中输入
http://localhost:8089/index.html

正常情况下，我们会被重定向到cas server的login界面



输入用户名：casuser；密码：Mellon点击login



认证成功后重定向到我们最初访问的页面


8.遇到的问题
8.1 点击login后过一段时间报错

引用

localhost 将您重定向的次数过多。 尝试清除 Cookie. ERR_TOO_MANY_REDIRECTS

通过查看浏览器请求记录，程序一直在访问index.html->尝试认证->认证返回->访问index.html 中循环

http://localhost:8080/cas-server/cas/login?service=http%3A%2F%2Flocalhost%3A8089%2Findex.html	302	GET	localhost:8080	/cas-server/cas/login?service=http%3A%2F%2Flocalhost%3A8089%2Findex.html	Thu Feb 01 10:08:25 CST 2018	18	1392	Complete	
http://localhost:8080/cas-server/login?service=http%3A%2F%2Flocalhost%3A8089%2Findex.html	302	GET	localhost:8080	/cas-server/login?service=http%3A%2F%2Flocalhost%3A8089%2Findex.html	Thu Feb 01 10:08:25 CST 2018	25	1390	Complete	
http://localhost:8089/index.html?ticket=ST-15-TbxurFIR6UZGXCrlmzH5-cas01.example.org	302	GET	localhost:8089	/index.html?ticket=ST-15-TbxurFIR6UZGXCrlmzH5-cas01.example.org	Thu Feb 01 10:08:25 CST 2018	10	725	Complete	
http://localhost:8080/cas-server/cas/login?service=http%3A%2F%2Flocalhost%3A8089%2Findex.html	302	GET	localhost:8080	/cas-server/cas/login?service=http%3A%2F%2Flocalhost%3A8089%2Findex.html	Thu Feb 01 10:08:25 CST 2018	3	1392	Complete	
http://localhost:8080/cas-server/login?service=http%3A%2F%2Flocalhost%3A8089%2Findex.html	302	GET	localhost:8080	/cas-server/login?service=http%3A%2F%2Flocalhost%3A8089%2Findex.html	Thu Feb 01 10:08:25 CST 2018	15	1390	Complete	
http://localhost:8089/index.html?ticket=ST-16-qXBicEb1u4SX2Nm0W5cg-cas01.example.org	302	GET	localhost:8089	/index.html?ticket=ST-16-qXBicEb1u4SX2Nm0W5cg-cas01.example.org	Thu Feb 01 10:08:25 CST 2018	7	725	Complete	
http://localhost:8080/cas-server/cas/login?service=http%3A%2F%2Flocalhost%3A8089%2Findex.html	302	GET	localhost:8080	/cas-server/cas/login?service=http%3A%2F%2Flocalhost%3A8089%2Findex.html	Thu Feb 01 10:08:25 CST 2018	16	1392	Complete	
http://localhost:8080/cas-server/login?service=http%3A%2F%2Flocalhost%3A8089%2Findex.html	302	GET	localhost:8080	/cas-server/login?service=http%3A%2F%2Flocalhost%3A8089%2Findex.html	Thu Feb 01 10:08:25 CST 2018	15	1390	Complete	
.....

最终发现错误原因是service对应的url和CasAuthenticationFilter对应的监听路径不一致，所以会一直尝试认证，CasAuthenticationFilter默认监听的是/login/cas,一开始不明白设置成了/index.html，所以一直不能认证成功

8.2 点击login后，客户端控制台出现如下错误

引用

org.jasig.cas.client.util.XmlUtils       : 元素类型 "img" 必须由匹配的结束标记 "" 终止

原因是 spring security官网上的cas-server是3.4的，ticketValidator路基估计和4.2不一样，在4.2时，validator路径不需要 /cas了，路径前缀直接是
http://casServerIp:casServerPort/casServerContext
在本例子中就是http://localhost:8080/cas-server，而不是http://localhost:8080/cas-server/cas
至此，spring security结合cas的例子就结束了

9.最后再说一点在实际应用中，用户信息存储的问题

因为sso在实际应用中都是会有好多系统共同应用，如果我们能保证所有系统中权限、角色、组织、菜单等的定义保持一致，我们可以把就可以把权限系统对应的用户信息保存在server端（通常情况下这很难做到，因为提供sso的团队一般并不能完全左右使用sso的应用），如果不能保证一致，或是为了扩展需要，我们可在sso server端只是单纯的创建一个user表，其他的权限信息让各个应用自己维护，就如同我们在本例中采用的形式。

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