详解spring boot配置单点登录的案例分享

概述

企业内部一般都有一套单点登录系统（常用的实现有apereo cas），所有的内部系统的登录认证都对接它。本文介绍spring boot的程序如何对接CAS服务。

常用的安全框架有spring security和apache shiro。shiro的配置和使用相对简单，本文使用shrio对接CAS服务。

配置

新增依赖

pom.xml新增：

<properties>
  <shiro.version>1.2.4</shiro.version>
 </properties>
<dependencies>
<!--Apache Shiro -->
  <dependency>
   <groupId>org.apache.shiro</groupId>
   <artifactId>shiro-spring</artifactId>
   <version>${shiro.version}</version>
  </dependency>
  <dependency>
   <groupId>org.apache.shiro</groupId>
   <artifactId>shiro-ehcache</artifactId>
   <version>${shiro.version}</version>
  </dependency>
  <dependency>
   <groupId>org.apache.shiro</groupId>
   <artifactId>shiro-cas</artifactId>
   <version>${shiro.version}</version>
  </dependency>
</dependencies>

spring boot配置

application.properties

shiro.cas=https://cas.xxx.com # 这是CAS服务的地址
shiro.server=http://127.0.0.1:8080 # 自己应用的地址，测试使用127即可

应用配置

初始化shiro bean，将文件放到任意子包下即可，比如xxx.config，spring boot会自动扫描加载

@Configuration
public class ShiroCasConfiguration {
 private static final String casFilterUrlPattern = "/shiro-cas";

 @Bean
 public FilterRegistrationBean filterRegistrationBean() {
  FilterRegistrationBean filterRegistration = new FilterRegistrationBean();
  filterRegistration.setFilter(new DelegatingFilterProxy("shiroFilter"));
  filterRegistration.addInitParameter("targetFilterLifecycle", "true");
  filterRegistration.setEnabled(true);
  filterRegistration.addUrlPatterns("/*");
  return filterRegistration;
 }

 @Bean(name = "lifecycleBeanPostProcessor")
 public LifecycleBeanPostProcessor getLifecycleBeanPostProcessor() {
  return new LifecycleBeanPostProcessor();
 }

 @Bean(name = "securityManager")
 public DefaultWebSecurityManager getDefaultWebSecurityManager(@Value("${shiro.cas}") String casServerUrlPrefix,
                 @Value("${shiro.server}") String shiroServerUrlPrefix) {
  DefaultWebSecurityManager securityManager = new DefaultWebSecurityManager();
  CasRealm casRealm = new CasRealm();
  casRealm.setDefaultRoles("ROLE_USER");
  casRealm.setCasServerUrlPrefix(casServerUrlPrefix);
  casRealm.setCasService(shiroServerUrlPrefix + casFilterUrlPattern);
  securityManager.setRealm(casRealm);
  securityManager.setCacheManager(new MemoryConstrainedCacheManager());
  securityManager.setSubjectFactory(new CasSubjectFactory());
  return securityManager;
 }

 private void loadShiroFilterChain(ShiroFilterFactoryBean shiroFilterFactoryBean) {
  Map<String, String> filterChainDefinitionMap = new LinkedHashMap<>();

  filterChainDefinitionMap.put(casFilterUrlPattern, "casFilter");
  filterChainDefinitionMap.put("/login", "anon");
  filterChainDefinitionMap.put("/bower_components/**", "anon");//可以将不需要拦截的静态文件目录加进去
  filterChainDefinitionMap.put("/logout","logout");
  filterChainDefinitionMap.put("/**", "authc");
  shiroFilterFactoryBean.setFilterChainDefinitionMap(filterChainDefinitionMap);
 }

 /**
  * CAS Filter
  */
 @Bean(name = "casFilter")
 public CasFilter getCasFilter(@Value("${shiro.cas}") String casServerUrlPrefix,
         @Value("${shiro.server}") String shiroServerUrlPrefix) {
  CasFilter casFilter = new CasFilter();
  casFilter.setName("casFilter");
  casFilter.setEnabled(true);
  String loginUrl = casServerUrlPrefix + "/login?service=" + shiroServerUrlPrefix + casFilterUrlPattern;
  casFilter.setFailureUrl(loginUrl);
  return casFilter;
 }

 @Bean(name = "shiroFilter")
 public ShiroFilterFactoryBean getShiroFilterFactoryBean(DefaultWebSecurityManager securityManager,
               CasFilter casFilter,
               @Value("${shiro.cas}") String casServerUrlPrefix,
               @Value("${shiro.server}") String shiroServerUrlPrefix) {
  ShiroFilterFactoryBean shiroFilterFactoryBean = new ShiroFilterFactoryBean();
  shiroFilterFactoryBean.setSecurityManager(securityManager);
  String loginUrl = casServerUrlPrefix + "/login?service=" + shiroServerUrlPrefix + casFilterUrlPattern;
  shiroFilterFactoryBean.setLoginUrl(loginUrl);
  shiroFilterFactoryBean.setSuccessUrl("/");
  Map<String, Filter> filters = new HashMap<>();
  filters.put("casFilter", casFilter);
  LogoutFilter logoutFilter = new LogoutFilter();
  logoutFilter.setRedirectUrl(casServerUrlPrefix + "/logout?service=" + shiroServerUrlPrefix);
  filters.put("logout",logoutFilter);
  shiroFilterFactoryBean.setFilters(filters);

  loadShiroFilterChain(shiroFilterFactoryBean);
  return shiroFilterFactoryBean;
 }
}

程序中获取登录的用户名

上述配置完成后，就可以找程序中获取登录用户的名字了

public String getUsername() {
  Subject subject = SecurityUtils.getSubject();
  if (subject == null || subject.getPrincipals() == null) {
   return DEFAULTUSER;
  }
  return (String) subject.getPrincipals().getPrimaryPrincipal();
 }

总结

shiro使用还是比较简单的，使用的时候只需要修改application.properties即可

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