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Shiro+Cas微服务化及前后端完全分离

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shiro+cas微服务化笔记

1.Spring Boot 配置

有如下两个配置文件：ShiroBaseConfig.java

import lombok.extern.log4j.Log4j;
import org.apache.shiro.cache.CacheManager;
import org.apache.shiro.cache.MemoryConstrainedCacheManager;
import org.apache.shiro.cas.CasFilter;
import org.apache.shiro.codec.Base64;
import org.apache.shiro.session.mgt.eis.MemorySessionDAO;
import org.apache.shiro.web.mgt.CookieRememberMeManager;
import org.apache.shiro.web.servlet.SimpleCookie;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

/**
 * <p>
 * Description: shiro权限管理模块conf
 *
 * @author Dean.Hwang
 * @date 17/5/18
 */
@Configuration
@Log4j
public class ShiroBaseConfiguration {
 @Value("${cas.server.url.prefix}")
 private String casPrefix;
 @Value("${cas.service}")
 private String casService;
 
 /**
  * 会话Cookie模板
  *
  * @return
  */
 @Bean
 public SimpleCookie sessionIdCookie() {
  SimpleCookie simpleCookie = new SimpleCookie("sid");
  simpleCookie.setHttpOnly(true);
  simpleCookie.setMaxAge(1800000);
  return simpleCookie;
 }

 /**
  * 会话Cookie模板
  *
  * @return
  */
 @Bean
 public SimpleCookie rememberCookie() {
  SimpleCookie simpleCookie = new SimpleCookie("rememberMe");
  simpleCookie.setHttpOnly(true);
  simpleCookie.setMaxAge(2592000);//30天
  return simpleCookie;
 }

 /**
  * rememberMe 管理器
  *
  * @return
  */
 @Bean
 public CookieRememberMeManager rememberMeManager(SimpleCookie rememberCookie) {
  CookieRememberMeManager cookieRememberMeManager = new CookieRememberMeManager();
  cookieRememberMeManager.setCipherKey(Base64.decode(""));// rememberMe cookie加密的密钥 建议每个项目都不一样 默认AES算法 密钥长度（128 256 512 位）
  cookieRememberMeManager.setCookie(rememberCookie);
  return cookieRememberMeManager;
 }

 /**
  * 会话DAO
  *
  * @return
  */
 @Bean
 public MemorySessionDAO sessionDAO() {
  return new MemorySessionDAO();
 }


 @Bean
 public CacheManager shiroCacheManager() {
  return new MemoryConstrainedCacheManager();
 }

 @Bean
 public KryCasRealm casRealm(CacheManager shiroCacheManager) {
  return new KryCasRealm(casPrefix, casService, shiroCacheManager);
 }

 @Bean
 public CasFilter casFilter() {
  CasFilter casFilter = new CasFilter();
  casFilter.setEnabled(true);
  casFilter.setName("casFilter");
  casFilter.setFailureUrl("/authority/casFailure");
  return casFilter;
 }


}

下面ShiroManagerConfiguration.java 文件

import org.apache.shiro.cache.CacheManager;
import org.apache.shiro.cas.CasFilter;
import org.apache.shiro.cas.CasSubjectFactory;
import org.apache.shiro.spring.web.ShiroFilterFactoryBean;
import org.apache.shiro.web.filter.authc.LogoutFilter;
import org.apache.shiro.web.mgt.CookieRememberMeManager;
import org.apache.shiro.web.mgt.DefaultWebSecurityManager;
import org.apache.shiro.web.session.mgt.ServletContainerSessionManager;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.beans.factory.config.MethodInvokingFactoryBean;
import org.springframework.boot.autoconfigure.AutoConfigureAfter;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

import javax.servlet.Filter;
import java.util.HashMap;
import java.util.Map;

/**
 * </p>
 * <p>
 * Copyright: Copyright (c) 2015
 * </p>
 * <p>
 * </p>
 *
 * @author Dean.Hwang
 * @date 17/5/18
 */
@Configuration
@AutoConfigureAfter(
  {ShiroBaseConfiguration.class}
)
public class ShiroManagerConfiguration {
 @Autowired
 private KryCasRealm kryCasRealm;
 @Autowired
 private CacheManager shiroCacheManager;
 @Autowired
 private CookieRememberMeManager rememberMeManager;
 @Value("${cas.server.login.url}")
 private String loginUrl;
 @Value("${cas.client.url.prefix}")
 private String urlPrefix;
 @Autowired
 private CasFilter casFilter;
 @Value("${cas.server.logout.url}")
 private String logoutUrl;
 @Value("${cas.client.index.url}")
 private String indexUrl;

 @Bean
 public DefaultWebSecurityManager securityManager() {
  DefaultWebSecurityManager securityManager = new DefaultWebSecurityManager();
  securityManager.setRealm(kryCasRealm);
  securityManager.setSessionManager(new ServletContainerSessionManager());
  securityManager.setCacheManager(shiroCacheManager);
  securityManager.setRememberMeManager(rememberMeManager);
  securityManager.setSubjectFactory(new CasSubjectFactory());
  return securityManager;
 }

 /**
  * 相当于调用SecurityUtils.setSecurityManager(securityManager)
  *
  * @param securityManager
  * @return
  */
 @Bean
 public MethodInvokingFactoryBean methodInvokingFactoryBean(DefaultWebSecurityManager securityManager) {
  MethodInvokingFactoryBean bean = new MethodInvokingFactoryBean();
  bean.setStaticMethod("org.apache.shiro.SecurityUtils.setSecurityManager");
  bean.setArguments(new Object[]{securityManager});
  return bean;
 }

 @Bean
 public ShiroFilterFactoryBean shiroFilter(DefaultWebSecurityManager securityManager) {
   ShiroFilterFactoryBean factoryBean = new ShiroFilterFactoryBean();
  factoryBean.setSecurityManager(securityManager);
  factoryBean.setLoginUrl(loginUrl + serviceStr + urlPrefix + "/cas");
  factoryBean.setSuccessUrl("../mind/index.do");
  factoryBean.setUnauthorizedUrl("/unauthorized.jsp");
  Map<String, Filter> filterMap = new HashMap<>();
  filterMap.put("cas", casFilter);
  filterMap.put("user", portalUserFilter);
  //只能在这里初始化LogoutFilter，不然会被spring boot注册到/*
  PortalLogoutFilter logoutFilter = new PortalLogoutFilter();
  logoutFilter.setRedirectUrl(logoutUrl + serviceStr + indexUrl);
  filterMap.put("logout", logoutFilter);
  factoryBean.setFilters(filterMap);
  Map<String, String> filters = new HashMap<>();
  filters.put("/casFailure.jsp", "anon");
  filters.put("/js/**", "anon");
  filters.put("/themes/**", "anon");
  filters.put("/3rdOauth/**", "anon");
  filters.put("/cas", "cas");
  filters.put("/logout", "logout");
  filters.put("/**", "user");
  factoryBean.setFilterChainDefinitionMap(filters);
  return factoryBean; }
}

2.UserFilter的改造

2.1改造的原因：

因为，我们现在新的服务器架构是前后端完全分离的。但是，shiro是不支持完全的前后端分离。所以导致了单点登录完成以后会跳转至接口，而不是目标页面。同时，由于历史原因，我们的cas验证服务器与业务服务器不是同一个域。如果，需要在服务器端进行重定向就必须要通过跨域，考虑到跨域会有风险。所以，我也将sso服务器登录重定向进行了重构。做成了返回json，前端在接收到json自己进行登录页跳转。

具体的实现代码如下:

protected void saveRequestAndRedirectToLogin(ServletRequest request, ServletResponse response) throws IOException {
  Session session = SecurityUtils.getSubject().getSession();
  if (session != null) {
   SavedRequest savedRequest = new PortalSavedRequest(WebUtils.toHttp(request));//重写的SavedRequest，具体处理由不同的业务需求自定
   session.setAttribute(SAVED_REQUEST_KEY, savedRequest);

  }
  PrintWriter out = null;
  try {
   ResultVO<Object> vo = ResultVO.isRedirect();
   RedirectInfo info = new RedirectInfo(loginRedirectUrl);
   vo.setData(info);
   response.setCharacterEncoding("UTF-8");
   response.setContentType("application/json; charset=utf-8");
   out = response.getWriter();
   out.write(JsonMapper.nonDefaultMapper().toJson(vo));
  } catch (IOException e) {
   log.error("登录重定向失败(Login Redirect Failed)", e);
  } finally {
   if (out != null) {
    out.close();
   }
  }
 }

此方法是将Cas中的Userfilter进行了重写，并且在配置时使用重写的类对原有的UserFilter进行了覆盖。

#3.登录成功后的重定向:

由于在sso验证服务器登录成功以后会重定向到本地业务服务器上。本地业务服务器验证登录成功以后会默认重定向至配置的SuccessUrl。这样并不能将页面跳转回用户的原来请求的页面。所以我重写了CasFilter中的issueSuccessRedirect达到这个目的

/**
 * <p>
 * Copyright: Copyright (c) 2015
 * </p>
 *
 * @author Dean.Hwang
 * @date 17/7/17
 */
public class PortalCasFilter extends CasFilter {

 @Override
 protected void issueSuccessRedirect(ServletRequest request, ServletResponse response) throws Exception {
  String successUrl = ((ShiroHttpServletRequest) request).getHeader("page-url");//前端页面在请求的时候在header中带上请求这个接口的url。这样便将登录成功后需要跳转的地址绑定到了对应的Subject对象中。以便于在登录以后跳转到这个页面
  if (StringUtil.isBlank(successUrl)) {
   WebUtils.redirectToSavedRequest(request, response, getSuccessUrl());
  } else {
   WebUtils.redirectToSavedRequest(request, response, successUrl);
  }
 }
}

#4.用户安全的退出

后期发现直接依靠原有的logout会发生session未注销的情况。所以重写了LogoutFilter。登出的时候直接调用配置的URL即可

/**

 * </p>
 * <p>
 * Copyright: Copyright (c) 2015
 * </p>
 *
 * @author Dean.Hwang
 * @date 17/7/17
 */
public class PortalLogoutFilter extends AdviceFilter {

 private static final Logger log = LoggerFactory.getLogger(LogoutFilter.class);

 public static final String DEFAULT_REDIRECT_URL = "/";

 private String redirectUrl = DEFAULT_REDIRECT_URL;

 @Override
 protected boolean preHandle(ServletRequest request, ServletResponse response) throws Exception {
  Subject subject = getSubject(request, response);
  String redirectUrl = getRedirectUrl(request, response, subject);
  //try/catch added for SHIRO-298:
  try {
   subject.logout();
   Session session = subject.getSession();
   session.stop();
  } catch (SessionException ise) {
   log.debug("Encountered session exception during logout. This can generally safely be ignored.", ise);
  }
  issueRedirect(request, response, redirectUrl);
  return false;
 }
}
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