sso-merryyou: 使用spring security实现简单的，sso单点登录

> [单点登录](https://zh.wikipedia.org/wiki/%E5%96%AE%E4%B8%80%E7%99%BB%E5%85%A5)（英语：Single sign-on，缩写为 SSO），又译为单一签入，一种对于许多相互关连，但是又是各自独立的软件系统，提供访问控制的属性。当拥有这项属性时，当用户登录时，就可以获取所有系统的访问权限，不用对每个单一系统都逐一登录。这项功能通常是以轻型目录访问协议（LDAP）来实现，在服务器上会将用户信息存储到LDAP数据库中。相同的，单一注销（single sign-off）就是指，只需要单一的注销动作，就可以结束对于多个系统的访问权限。

## Security OAuth2 单点登录流程示意图

[![https://raw.githubusercontent.com/longfeizheng/longfeizheng.github.io/master/images/security/SpringSecurity-OAuth2-sso.png](https://raw.githubusercontent.com/longfeizheng/longfeizheng.github.io/master/images/security/SpringSecurity-OAuth2-sso.png "https://raw.githubusercontent.com/longfeizheng/longfeizheng.github.io/master/images/security/SpringSecurity-OAuth2-sso.png")](https://raw.githubusercontent.com/longfeizheng/longfeizheng.github.io/master/images/security/SpringSecurity-OAuth2-sso.png "https://raw.githubusercontent.com/longfeizheng/longfeizheng.github.io/master/images/security/SpringSecurity-OAuth2-sso.png")

1. 访问client1
2. `client1`将请求导向`sso-server`
3. 同意授权
4. 携带授权码`code`返回`client1`
5. `client1`拿着授权码请求令牌
6. 返回`JWT`令牌
7. `client1`解析令牌并登录
8. `client1`访问`client2`
9. `client2`将请求导向`sso-server`
10. 同意授权
11. 携带授权码`code`返回`client2`
12. `client2`拿着授权码请求令牌
13. 返回`JWT`令牌
14. `client2`解析令牌并登录

用户的登录状态是由`sso-server`认证中心来保存的，登录界面和账号密码的验证也是`sso-server`认证中心来做的（**`client1`和`clien2`返回`token`是不同的，但解析出来的用户信息是同一个用户**）。

## Security OAuth2 实现单点登录

### 项目结构
[![https://raw.githubusercontent.com/longfeizheng/longfeizheng.github.io/master/images/security/spring-security-oauth2-sso01.png](https://raw.githubusercontent.com/longfeizheng/longfeizheng.github.io/master/images/security/spring-security-oauth2-sso01.png "https://raw.githubusercontent.com/longfeizheng/longfeizheng.github.io/master/images/security/spring-security-oauth2-sso01.png")](https://raw.githubusercontent.com/longfeizheng/longfeizheng.github.io/master/images/security/spring-security-oauth2-sso01.png "https://raw.githubusercontent.com/longfeizheng/longfeizheng.github.io/master/images/security/spring-security-oauth2-sso01.png")

### sso-server
#### 认证服务器
```java
@Configuration
@EnableAuthorizationServer
public class SsoAuthorizationServerConfig extends AuthorizationServerConfigurerAdapter {

/**
     * 客户端一些配置
     * @param clients
     * @throws Exception
     */
    @Override
    public void configure(ClientDetailsServiceConfigurer clients) throws Exception {
        clients.inMemory()
                .withClient("merryyou1")
                .secret("merryyousecrect1")
                .authorizedGrantTypes("authorization_code", "refresh_token")
                .scopes("all")
                .and()
                .withClient("merryyou2")
                .secret("merryyousecrect2")
                .authorizedGrantTypes("authorization_code", "refresh_token")
                .scopes("all");
    }

/**
     * 配置jwttokenStore
     * @param endpoints
     * @throws Exception
     */
    @Override
    public void configure(AuthorizationServerEndpointsConfigurer endpoints) throws Exception {
        endpoints.tokenStore(jwtTokenStore()).accessTokenConverter(jwtAccessTokenConverter());
    }

/**
     * springSecurity 授权表达式，访问merryyou tokenkey时需要经过认证
     * @param security
     * @throws Exception
     */
    @Override
    public void configure(AuthorizationServerSecurityConfigurer security) throws Exception {
        security.tokenKeyAccess("isAuthenticated()");
    }

/**
     * JWTtokenStore
     * @return
     */
    @Bean
    public TokenStore jwtTokenStore() {
        return new JwtTokenStore(jwtAccessTokenConverter());
    }

/**
     * 生成JTW token
     * @return
     */
    @Bean
    public JwtAccessTokenConverter jwtAccessTokenConverter(){
        JwtAccessTokenConverter converter = new JwtAccessTokenConverter();
        converter.setSigningKey("merryyou");
        return converter;
    }
}
```
#### security配置
```java
@Configuration
public class SsoSecurityConfig extends WebSecurityConfigurerAdapter {

@Autowired
    private UserDetailsService userDetailsService;

@Bean
    public PasswordEncoder passwordEncoder() {
        return new BCryptPasswordEncoder();
    }

@Override
    protected void configure(HttpSecurity http) throws Exception {
        http.formLogin().loginPage("/authentication/require")
                .loginProcessingUrl("/authentication/form")
                .and().authorizeRequests()
                .antMatchers("/authentication/require",
                        "/authentication/form",
                        "/**/*.js",
                        "/**/*.css",
                        "/**/*.jpg",
                        "/**/*.png",
                        "/**/*.woff2"
                )
                .permitAll()
                .anyRequest().authenticated()
                .and()
                .csrf().disable();
//        http.formLogin().and().authorizeRequests().anyRequest().authenticated();
    }

@Override
    protected void configure(AuthenticationManagerBuilder auth) throws Exception {
        auth.userDetailsService(userDetailsService).passwordEncoder(passwordEncoder());
    }
}
```
#### SsoUserDetailsService
```java
@Component
public class SsoUserDetailsService implements UserDetailsService {

@Autowired
    private PasswordEncoder passwordEncoder;

@Override
    public UserDetails loadUserByUsername(String username) throws UsernameNotFoundException {
        return new User(username, passwordEncoder.encode("123456"), AuthorityUtils.commaSeparatedStringToAuthorityList("ROLE_USER"));
    }
}
```
#### application.yml
```yaml
server:
  port: 8082
  context-path: /uaa
spring:
  freemarker:
    allow-request-override: false
    allow-session-override: false
    cache: true
    charset: UTF-8
    check-template-location: true
    content-type: text/html
    enabled: true
    expose-request-attributes: false
    expose-session-attributes: false
    expose-spring-macro-helpers: true
    prefer-file-system-access: true
    suffix: .ftl
    template-loader-path: classpath:/templates/
```
### sso-client1
#### SsoClient1Application
```java
@SpringBootApplication
@RestController
@EnableOAuth2Sso
public class SsoClient1Application {

@GetMapping("/user")
    public Authentication user(Authentication user) {
        return user;
    }

public static void main(String[] args) {
        SpringApplication.run(SsoClient1Application.class, args);
    }
}
```
#### application.yml
```java
auth-server: http://localhost:8082/uaa # sso-server地址
server:
  context-path: /client1
  port: 8083
security:
  oauth2:
    client:
      client-id: merryyou1
      client-secret: merryyousecrect1
      user-authorization-uri: ${auth-server}/oauth/authorize #请求认证的地址
      access-token-uri: ${auth-server}/oauth/token #请求令牌的地址
    resource:
      jwt:
        key-uri: ${auth-server}/oauth/token_key #解析jwt令牌所需要密钥的地址
```
### sso-client2
#### 同sso-client1一致

效果如下：
[![https://raw.githubusercontent.com/longfeizheng/longfeizheng.github.io/master/images/security/spring-security-oauth2-sso01.gif](https://raw.githubusercontent.com/longfeizheng/longfeizheng.github.io/master/images/security/spring-security-oauth2-sso01.gif "https://raw.githubusercontent.com/longfeizheng/longfeizheng.github.io/master/images/security/spring-security-oauth2-sso01.gif")](https://raw.githubusercontent.com/longfeizheng/longfeizheng.github.io/master/images/security/spring-security-oauth2-sso01.gif "https://raw.githubusercontent.com/longfeizheng/longfeizheng.github.io/master/images/security/spring-security-oauth2-sso01.gif")

## 启动方式
1. 启动sso-server
2. 启动sso-client1
3. 启动sso-client2
4. http://localhost:8083/client1/ 用户名随意，密码123456
5. http://localhost:8083/client1/user 查看当前的用户信息

## update2018年01月28日
增加sso-resource(支持sso-client1资源服务器)
## update2018年02月01日
由[laungcisin](https://github.com/laungcisin)提供`SsoAuthorizationServerConfig`自动授权配置`autoApprove(true)`
## update2018年04月19日
添加`docker-compose`启动方式，需在本地host文件中添加`127.0.0.1 sso-login sso-taobao sso-tmall sso-resource`.访问地址为：[http://sso-taobao:8083/client1](http://sso-taobao:8083/client1)

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