网上关于实现 SSO 的文章一大堆，但是当你真的照着写的时候就会发现根本不是那么回事儿，简直让人抓狂，尤其是对于我这样的菜鸟。几经曲折，终于搞定了，决定记录下来，以便后续查看。先来看一下效果：
准备①单点登录最常见的例子是，我们打开淘宝 APP，首页就会有天猫、聚划算等服务的链接，当你点击以后就直接跳过去了，并没有让你再登录一次。
下面这个图是我在网上找的，我觉得画得比较明白：
可惜有点儿不清晰，于是我又画了个简版的：
重要的是理解：-
SSO 服务端和 SSO 客户端直接是通过授权以后发放 Token 的形式来访问受保护的资源。
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相对于浏览器来说，业务系统是服务端，相对于 SSO 服务端来说，业务系统是客户端。
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浏览器和业务系统之间通过会话正常访问。
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不是每次浏览器请求都要去 SSO 服务端去验证，只要浏览器和它所访问的服务端的会话有效它就可以正常访问。
在本例实现 SSO 的过程中，受保护的资源就是用户的信息（包括，用户的基本信息，以及用户所具有的权限）。
而我们想要访问这这一资源就需要用户登录并授权，OAuth2 服务端负责令牌的发放等操作，这令牌的生成我们采用 JWT，也就是说 JWT 是用来承载用户的 Access_Token 的。最后，Spring Security 是用于安全访问的，这里我们我们用来做访问权限控制。认证服务器配置Maven 依赖：
<?xml version="1.0" encoding="UTF-8"?><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> <parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>2.1.3.RELEASE</version> <relativePath/> <!-- lookup parent from repository --> </parent> <groupId>com.cjs.sso</groupId> <artifactId>oauth2-sso-auth-server</artifactId> <version>0.0.1-SNAPSHOT</version> <name>oauth2-sso-auth-server</name>这里面最重要的依赖是：spring-security-oauth2-autoconfigure。application.yml：
<properties> <java.version>1.8</java.version> </properties>
<dependencies> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-data-jpa</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-data-redis</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-security</artifactId> </dependency> <dependency> <groupId>org.springframework.security.oauth.boot</groupId> <artifactId>spring-security-oauth2-autoconfigure</artifactId> <version>2.1.3.RELEASE</version> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-thymeleaf</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> <dependency> <groupId>org.springframework.session</groupId> <artifactId>spring-session-data-redis</artifactId> </dependency> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <scope>runtime</scope> </dependency> <dependency> <groupId>org.projectlombok</groupId> <artifactId>lombok</artifactId> <optional>true</optional> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-test</artifactId> <scope>test</scope> </dependency> <dependency> <groupId>org.springframework.security</groupId> <artifactId>spring-security-test</artifactId> <scope>test</scope> </dependency>
<dependency> <groupId>org.apache.commons</groupId> <artifactId>commons-lang3</artifactId> <version>3.8.1</version> </dependency> <dependency> <groupId>com.alibaba</groupId> <artifactId>fastjson</artifactId> <version>1.2.56</version> </dependency>
</dependencies>
<build> <plugins> <plugin> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-maven-plugin</artifactId> </plugin> </plugins> </build>
</project>
spring: datasource: url: jdbc:mysql://localhost:3306/permission username: root password: 123456 driver-class-name: com.mysql.jdbc.Driver jpa: show-sql: true session: store-type: redis redis: host: 127.0.0.1 password: 123456 port: 6379server: port: 8080
AuthorizationServerConfig（重要）：package com.cjs.sso.config;说明：
import org.springframework.beans.factory.annotation.Autowired;import org.springframework.context.annotation.Bean;import org.springframework.context.annotation.Configuration;import org.springframework.context.annotation.Primary;import org.springframework.security.core.token.DefaultToken;import org.springframework.security.oauth2.config.annotation.configurers.ClientDetailsServiceConfigurer;import org.springframework.security.oauth2.config.annotation.web.configuration.AuthorizationServerConfigurerAdapter;import org.springframework.security.oauth2.config.annotation.web.configuration.EnableAuthorizationServer;import org.springframework.security.oauth2.config.annotation.web.configurers.AuthorizationServerEndpointsConfigurer;import org.springframework.security.oauth2.config.annotation.web.configurers.AuthorizationServerSecurityConfigurer;import org.springframework.security.oauth2.provider.token.DefaultTokenServices;import org.springframework.security.oauth2.provider.token.TokenStore;import org.springframework.security.oauth2.provider.token.store.JwtAccessTokenConverter;import org.springframework.security.oauth2.provider.token.store.JwtTokenStore;
import javax.sql.DataSource;
/** * @author ChengJianSheng * @date 2019-02-11 */@Configuration@EnableAuthorizationServerpublic class AuthorizationServerConfig extends AuthorizationServerConfigurerAdapter {
@Autowired private DataSource dataSource;
@Override public void configure(AuthorizationServerSecurityConfigurer security) throws Exception { security.allowFormAuthenticationForClients(); security.tokenKeyAccess("isAuthenticated()"); }
@Override public void configure(ClientDetailsServiceConfigurer clients) throws Exception { clients.jdbc(dataSource); }
@Override public void configure(AuthorizationServerEndpointsConfigurer endpoints) throws Exception { endpoints.accessTokenConverter(jwtAccessTokenConverter()); endpoints.tokenStore(jwtTokenStore());// endpoints.tokenServices(defaultTokenServices()); }
/*@Primary @Bean public DefaultTokenServices defaultTokenServices() { DefaultTokenServices defaultTokenServices = new DefaultTokenServices(); defaultTokenServices.setTokenStore(jwtTokenStore()); defaultTokenServices.setSupportRefreshToken(true); return defaultTokenServices; }*/
@Bean public JwtTokenStore jwtTokenStore() { return new JwtTokenStore(jwtAccessTokenConverter()); }
@Bean public JwtAccessTokenConverter jwtAccessTokenConverter() { JwtAccessTokenConverter jwtAccessTokenConverter = new JwtAccessTokenConverter(); jwtAccessTokenConverter.setSigningKey("cjs"); // Sets the JWT signing key return jwtAccessTokenConverter; }
}
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别忘了 @EnableAuthorizationServer。
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Token 存储采用的是 JWT。
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客户端以及登录用户这些配置存储在数据库，为了减少数据库的查询次数，可以从数据库读出来以后再放到内存中。
package com.cjs.sso.config;自定义登录页面（一般来讲都是要自定义的）：
import com.cjs.sso.service.MyUserDetailsService;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.context.annotation.Bean;import org.springframework.context.annotation.Configuration;import org.springframework.security.config.annotation.authentication.builders.AuthenticationManagerBuilder;import org.springframework.security.config.annotation.web.builders.HttpSecurity;import org.springframework.security.config.annotation.web.builders.WebSecurity;import org.springframework.security.config.annotation.web.configuration.EnableWebSecurity;import org.springframework.security.config.annotation.web.configuration.WebSecurityConfigurerAdapter;import org.springframework.security.crypto.bcrypt.BCryptPasswordEncoder;import org.springframework.security.crypto.password.PasswordEncoder;
/** * @author ChengJianSheng * @date 2019-02-11 */@Configuration@EnableWebSecuritypublic class WebSecurityConfig extends WebSecurityConfigurerAdapter {
@Autowired private MyUserDetailsService userDetailsService;
@Override protected void configure(AuthenticationManagerBuilder auth) throws Exception { auth.userDetailsService(userDetailsService).passwordEncoder(passwordEncoder()); }
@Override public void configure(WebSecurity web) throws Exception { web.ignoring().antMatchers("/assets/**", "/css/**", "/images/**"); }
@Override protected void configure(HttpSecurity http) throws Exception { http.formLogin() .loginPage("/login") .and() .authorizeRequests() .antMatchers("/login").permitAll() .anyRequest() .authenticated() .and().csrf().disable().cors(); }
@Bean public PasswordEncoder passwordEncoder() { return new BCryptPasswordEncoder(); }
}
package com.cjs.sso.controller;自定义登录页面的时候，只需要准备一个登录页面，然后写个 Controller 令其可以访问到即可，登录页面表单提交的时候 method 一定要是 post，最重要的时候 action 要跟访问登录页面的 url 一样。千万记住了，访问登录页面的时候是 GET 请求，表单提交的时候是 POST 请求，其他的就不用管了。
import org.springframework.stereotype.Controller;import org.springframework.web.bind.annotation.GetMapping;
/** * @author ChengJianSheng * @date 2019-02-12 */@Controllerpublic class LoginController {
@GetMapping("/login") public String login() { return "login"; }
@GetMapping("/") public String index() { return "index"; }
}
<!DOCTYPE html><html xmlns:th="http://www.thymeleaf.org"><head> <meta charset="utf-8"> <meta http-equiv="X-UA-Compatible" content="IE=edge"> <title>Ela Admin - HTML5 Admin Template</title> <meta name="description" content="Ela Admin - HTML5 Admin Template"> <meta name="viewport" content="width=device-width, initial-scale=1">定义客户端，如下图：
<link type="text/css" rel="stylesheet" th:href="@{/assets/css/normalize.css}"> <link type="text/css" rel="stylesheet" th:href="@{/assets/bootstrap-4.3.1-dist/css/bootstrap.min.css}"> <link type="text/css" rel="stylesheet" th:href="@{/assets/css/font-awesome.min.css}"> <link type="text/css" rel="stylesheet" th:href="@{/assets/css/style.css}">
</head><body class="bg-dark">
<div class="sufee-login d-flex align-content-center flex-wrap"> <div class="container"> <div class="login-content"> <div class="login-logo"> <h1 style="color: #57bf95;">欢迎来到王者荣耀</h1> </div> <div class="login-form"> <form th:action="@{/login}" method="post"> <div class="form-group"> <label>Username</label> <input type="text" class="form-control" name="username" placeholder="Username"> </div> <div class="form-group"> <label>Password</label> <input type="password" class="form-control" name="password" placeholder="Password"> </div> <div class="checkbox"> <label> <input type="checkbox"> Remember Me </label> <label class="pull-right"> <a href="#">Forgotten Password?</a> </label> </div> <button type="submit" class="btn btn-success btn-flat m-b-30 m-t-30" style="font-size: 18px;">登录</button> </form> </div> </div> </div></div>
<script type="text/javascript" th:src="@{/assets/js/jquery-2.1.4.min.js}"></script><script type="text/javascript" th:src="@{/assets/bootstrap-4.3.1-dist/js/bootstrap.min.js}"></script><script type="text/javascript" th:src="@{/assets/js/main.js}"></script>
</body></html>
加载用户，登录账户：package com.cjs.sso.domain;加载登录账户：
import lombok.Data;import org.springframework.security.core.GrantedAuthority;import org.springframework.security.core.userdetails.User;
import java.util.Collection;
/** * 大部分时候直接用User即可不必扩展 * @author ChengJianSheng * @date 2019-02-11 */@Datapublic class MyUser extends User {
private Integer departmentId; // 举个例子，部门ID
private String mobile; // 举个例子，假设我们想增加一个字段，这里我们增加一个mobile表示手机号
public MyUser(String username, String password, Collection<? extends GrantedAuthority> authorities) { super(username, password, authorities); }
public MyUser(String username, String password, boolean enabled, boolean accountNonExpired, boolean credentialsNonExpired, boolean accountNonLocked, Collection<? extends GrantedAuthority> authorities) { super(username, password, enabled, accountNonExpired, credentialsNonExpired, accountNonLocked, authorities); }}
package com.cjs.sso.service;验证：
import com.alibaba.fastjson.JSON;import com.cjs.sso.domain.MyUser;import com.cjs.sso.entity.SysPermission;import com.cjs.sso.entity.SysUser;import lombok.extern.slf4j.Slf4j;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.security.core.authority.SimpleGrantedAuthority;import org.springframework.security.core.userdetails.UserDetails;import org.springframework.security.core.userdetails.UserDetailsService;import org.springframework.security.core.userdetails.UsernameNotFoundException;import org.springframework.security.crypto.password.PasswordEncoder;import org.springframework.stereotype.Service;import org.springframework.util.CollectionUtils;
import java.util.ArrayList;import java.util.List;
/** * @author ChengJianSheng * @date 2019-02-11 */@Slf4j@Servicepublic class MyUserDetailsService implements UserDetailsService {
@Autowired private PasswordEncoder passwordEncoder;
@Autowired private UserService userService;
@Autowired private PermissionService permissionService;
@Override public UserDetails loadUserByUsername(String username) throws UsernameNotFoundException { SysUser sysUser = userService.getByUsername(username); if (null == sysUser) { log.warn("用户{}不存在", username); throw new UsernameNotFoundException(username); } List<SysPermission> permissionList = permissionService.findByUserId(sysUser.getId()); List<SimpleGrantedAuthority> authorityList = new ArrayList<>(); if (!CollectionUtils.isEmpty(permissionList)) { for (SysPermission sysPermission : permissionList) { authorityList.add(new SimpleGrantedAuthority(sysPermission.getCode())); } }
MyUser myUser = new MyUser(sysUser.getUsername(), passwordEncoder.encode(sysUser.getPassword()), authorityList);
log.info("登录成功！用户: {}", JSON.toJSONString(myUser));
return myUser; }}
当我们看到这个界面的时候，表示认证服务器配置完成。 两个客户端Maven 依赖：<?xml version="1.0" encoding="UTF-8"?><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> <parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>2.1.3.RELEASE</version> <relativePath/> <!-- lookup parent from repository --> </parent> <groupId>com.cjs.sso</groupId> <artifactId>oauth2-sso-client-member</artifactId> <version>0.0.1-SNAPSHOT</version> <name>oauth2-sso-client-member</name> <description>Demo project for Spring Boot</description>application.yml：
<properties> <java.version>1.8</java.version> </properties>
<dependencies> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-data-jpa</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-oauth2-client</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-security</artifactId> </dependency> <dependency> <groupId>org.springframework.security.oauth.boot</groupId> <artifactId>spring-security-oauth2-autoconfigure</artifactId> <version>2.1.3.RELEASE</version> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-thymeleaf</artifactId> </dependency> <dependency> <groupId>org.thymeleaf.extras</groupId> <artifactId>thymeleaf-extras-springsecurity5</artifactId> <version>3.0.4.RELEASE</version> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency>
<dependency> <groupId>com.h2database</groupId> <artifactId>h2</artifactId> <scope>runtime</scope> </dependency> <dependency> <groupId>org.projectlombok</groupId> <artifactId>lombok</artifactId> <optional>true</optional> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-test</artifactId> <scope>test</scope> </dependency> <dependency> <groupId>org.springframework.security</groupId> <artifactId>spring-security-test</artifactId> <scope>test</scope> </dependency> </dependencies>
<build> <plugins> <plugin> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-maven-plugin</artifactId> </plugin> </plugins> </build>
</project>
server: port: 8082 servlet: context-path: /memberSystemsecurity: oauth2: client: client-id: UserManagement client-secret: user123 access-token-uri: http://localhost:8080/oauth/token user-authorization-uri: http://localhost:8080/oauth/authorize resource: jwt: key-uri: http://localhost:8080/oauth/token_key
这里 context-path 不要设成 /，不然重定向获取 code 的时候回被拦截。WebSecurityConfig：package com.cjs.example.config;说明：
import com.cjs.example.util.EnvironmentUtils;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.boot.autoconfigure.security.oauth2.client.EnableOAuth2Sso;import org.springframework.context.annotation.Configuration;import org.springframework.security.config.annotation.web.builders.HttpSecurity;import org.springframework.security.config.annotation.web.builders.WebSecurity;import org.springframework.security.config.annotation.web.configuration.WebSecurityConfigurerAdapter;
/** * @author ChengJianSheng * @date 2019-03-03 */@EnableOAuth2Sso@Configurationpublic class WebSecurityConfig extends WebSecurityConfigurerAdapter {
@Autowired private EnvironmentUtils environmentUtils;
@Override public void configure(WebSecurity web) throws Exception { web.ignoring().antMatchers("/bootstrap/**"); }
@Override protected void configure(HttpSecurity http) throws Exception { if ("local".equals(environmentUtils.getActiveProfile())) { http.authorizeRequests().anyRequest().permitAll(); }else { http.logout().logoutSuccessUrl("http://localhost:8080/logout") .and() .authorizeRequests() .anyRequest().authenticated() .and() .csrf().disable(); } }}
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最重要的注解是 @EnableOAuth2Sso。
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权限控制这里采用 Spring Security 方法级别的访问控制，结合 Thymeleaf 可以很容易做权限控制。
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顺便多提一句，如果是前后端分离的话，前端需求加载用户的权限，然后判断应该显示那些按钮那些菜单。
package com.cjs.example.controller;Order 项目跟它是一样的：
import org.springframework.security.access.prepost.PreAuthorize;import org.springframework.security.core.Authentication;import org.springframework.stereotype.Controller;import org.springframework.web.bind.annotation.GetMapping;import org.springframework.web.bind.annotation.PostMapping;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.ResponseBody;
import java.security.Principal;
/** * @author ChengJianSheng * @date 2019-03-03 */@Controller@RequestMapping("/member")public class MemberController {
@GetMapping("/list") public String list() {
return "member/list"; }
@GetMapping("/info") @ResponseBody public Principal info(Principal principal) { return principal; }
@GetMapping("/me") @ResponseBody public Authentication me(Authentication authentication) { return authentication; }
@PreAuthorize("hasAuthority('member:save')") @ResponseBody @PostMapping("/add") public String add() {
return "add"; }
@PreAuthorize("hasAuthority('member:detail')") @ResponseBody @GetMapping("/detail") public String detail() { return "detail"; }}
server: port: 8083 servlet: context-path: /orderSystemsecurity: oauth2: client: client-id: OrderManagement client-secret: order123 access-token-uri: http://localhost:8080/oauth/token user-authorization-uri: http://localhost:8080/oauth/authorize resource: jwt: key-uri: http://localhost:8080/oauth/token_key
关于退出：退出就是清空用于与 SSO 客户端建立的所有的会话，简单的来说就是使所有端点的 Session 失效，如果想做得更好的话可以令 Token 失效，但是由于我们用的 JWT，故而撤销 Token 就不是那么容易，关于这一点，在官网上也有提到：
本例中采用的方式是在退出的时候先退出业务服务器，成功以后再回调认证服务器，但是这样有一个问题，就是需要主动依次调用各个业务服务器的 logout。工程结构
附上源码：https://github.com/chengjiansheng/cjs-oauth2-sso-demo.git
演示
