使用OAuth2的SSO分析

参考:https://github.com/spring-guides/tut-spring-security-and-angular-js/blob/master/oauth2-vanilla/README.adoc 

1.浏览器向UI服务器点击触发要求安全认证 
2.跳转到授权服务器获取授权许可码 
3.从授权服务器带授权许可码跳回来 
4.UI服务器向授权服务器获取AccessToken 
5.返回AccessToken到UI服务器 
6.发出/resource请求到UI服务器 
7.UI服务器将/resource请求转发到Resource服务器 
8.Resource服务器要求安全验证,于是直接从授权服务器获取认证授权信息进行判断后(最后会响应给UI服务器,UI服务器再响应给浏览中器）

一.先创建OAuth2授权服务器 
1.使用spring Initializrt生成初始项目,选使用spring boot 1.3.3生成maven项目,根据需要填写group,artifact,依赖选Web和Security两块,点生成按钮即可. 
2.加入OAuth2依赖到pom.xml

<dependency>
   <groupId>org.springframework.security.oauth</groupId>
    <artifactId>spring-security-oauth2</artifactId>
</dependency>

修改主类(这里同时也作为资源服务器)

@SpringBootApplication
@RestController
@EnableAuthorizationServer
@EnableResourceServer
public class AuthserverApplication {

    @RequestMapping("/user")
    public Principal user(Principal user) {
        return user;
    }

    public static void main(String[] args) {
        SpringApplication.run(AuthserverApplication.class, args);
    }

}

同时修改servlet容器的port,contextPath,注册一个测试用户与客户端,加入配置:application.properties

server.port: 9999
server.contextPath: /uaa
security.user.password: password
security.sessions: if-required
security.oauth2.client.clientId: acme
security.oauth2.client.clientSecret: acmesecret
security.oauth2.client.authorized-grant-types: authorization_code,refresh_token,password
security.oauth2.client.scope: openid

基于spring boot的security的session创建策略默认是STATELESS,至于几个选项意义,可看

org.springframework.security.config.http.SessionCreationPolicy

启动授权服务器后,可测试了: 

a.打开浏览器输入地址

http://localhost:9999/uaa/oauth/authorize?response_type=code&client_id=acme&redirect_uri=http://example.com

发出请求,然后根据以上配置,输入用户名/密码,点同意,获取返回的授权许可码 

b.在Linux的bash或mac的terminal输入 

[root@dev ~]#curl acme:acmesecret@192.168.1.115:9999/uaa/oauth/token  
-d grant_type=authorization_code -d client_id=acme  
-d redirect_uri=http://example.com -d code=fjRdsL 

回车获取access token,其中fjRdsL替换上步获取的授权许可码.返回结果类似如下: 

{
  "access_token": "8eded27d-b849-4473-8b2d-49ae49e17943",
  "token_type": "bearer",
  "refresh_token": "5e9af75c-c442-433f-81ba-996eb2c00f53",
  "expires_in": 43199,
  "scope": "openid"
}

从返回结果复制access_token,继续: 

[root@dev ~]# TOKEN=8eded27d-b849-4473-8b2d-49ae49e17943 
[root@dev ~]# curl -H “Authorization: Bearer $TOKEN” 192.168.1.115:9999/uaa/user 

其中上面的8eded27d-b849-4473-8b2d-49ae49e17943是access_token,根据实际情况替换,第二个命令返回结果类似如下: 

{
  "details": {
    "remoteAddress": "192.168.1.194",
    "sessionId": null,
    "tokenValue": "8eded27d-b849-4473-8b2d-49ae49e17943",
    "tokenType": "Bearer",
    "decodedDetails": null
  },
  "authorities": [
    {
      "authority": "ROLE_USER"
    }
  ],
  "authenticated": true,
  "userAuthentication": {
    "details": {
      "remoteAddress": "0:0:0:0:0:0:0:1",
      "sessionId": "3943F6861E0FE31C29568542730342F6"
    },
    "authorities": [
      {
        "authority": "ROLE_USER"
      }
    ],
    "authenticated": true,
    "principal": {
      "password": null,
      "username": "user",
      "authorities": [
        {
          "authority": "ROLE_USER"
        }
      ],
      "accountNonExpired": true,
      "accountNonLocked": true,
      "credentialsNonExpired": true,
      "enabled": true
    },
    "credentials": null,
    "name": "user"
  },
  "oauth2Request": {
    "clientId": "acme",
    "scope": [
      "openid"
    ],
    "requestParameters": {
      "response_type": "code",
      "redirect_uri": "http://example.com",
      "code": "QzbdLe",
      "grant_type": "authorization_code",
      "client_id": "acme"
    },
    "resourceIds": [],
    "authorities": [
      {
        "authority": "ROLE_USER"
      }
    ],
    "approved": true,
    "refresh": false,
    "redirectUri": "http://example.com",
    "responseTypes": [
      "code"
    ],
    "extensions": {},
    "grantType": "authorization_code",
    "refreshTokenRequest": null
  },
  "credentials": "",
  "principal": {
    "password": null,
    "username": "user",
    "authorities": [
      {
        "authority": "ROLE_USER"
      }
    ],
    "accountNonExpired": true,
    "accountNonLocked": true,
    "credentialsNonExpired": true,
    "enabled": true
  },
  "clientOnly": false,
  "name": "user"
}

从结果来看,使用access token访问资源一切正常,说明授权服务器没问题.

二.再看分离的资源服务器(改动也不少) 

不再使用Spring Session从Redis抽取认证授权信息,而是使用ResourceServerTokenServices向授权服务器发送请求获取认证授权信息.
因些没用到Spring Session时可移除,同时application.properties
配置
security.oauth2.resource.userInfoUri
或
security.oauth2.resource.tokenInfoUri
中的一个,
主类修改如下:

@SpringBootApplication
@RestController
@EnableResourceServer
public class ResourceApplication {
    @RequestMapping("/")
    public Message home() {
        return new Message("Hello World");
    }
    public static void main(String[] args) {
        SpringApplication.run(ResourceApplication.class, args);
    }
}

最后运行主类的main方法,开始测试(授权服务器前面启动了,access_token也得到了),于是在使用curl命令: 

[root@dev ~]# curl -H “Authorization: Bearer $TOKEN” 192.168.1.115:9000 

返回结果类似如下: 

{
  "id": "03af8be3-2fc3-4d75-acf7-c484d9cf32b1",
  "content": "Hello World"
} 

可借鉴的经验,我在windows上开发,启动资源服务器,然后资源服务器有配置

server.address: 127.0.0.1

,这里限制容器只能是本机访问,
如果使用局域网IP是不可以访问的,比如你在别人的机器或在一台虚拟的linux上使用curl都是不是访问的,注释这行配置,这限制就解除. 

跟踪下获取认证授权的信息过程: 
1.userInfoRestTemplate Bean的声明在

org.springframework.boot.autoconfigure.security.oauth2.resource.ResourceServerTokenServicesConfiguration.

UserInfoRestTemplateConfiguration#userInfoRestTemplate 

2.使用前面配置的userInfoUri和上面的userInfoRestTemplate Bean在org.springframework.boot.autoconfigure.security.oauth2.resource.ResourceServerTokenServicesConfiguration.
RemoteTokenServicesConfiguration.
UserInfoTokenServicesConfiguration#userInfoTokenServices
创建UserInfoTokenServices Bean. 

3.在org.springframework.security.oauth2.config.annotation.web.configurers.ResourceServerSecurityConfigurer#configure添加了org.springframework.security.oauth2.provider.authentication.OAuth2AuthenticationProcessingFilter 

4.当使用curl -H “Authorization: Bearer $TOKEN” 192.168.1.115:9000发出请求时,直到被OAuth2AuthenticationProcessingFilter拦截器处理, 
org.springframework.security.oauth2.provider.authentication.OAuth2AuthenticationProcessingFilter
#doFilter{ 
Authentication authentication = tokenExtractor.extract(request);//抽取Token 
Authentication authResult = authenticationManager.authenticate(authentication);//还原解码认证授权信息 
} 
org.springframework.security.oauth2.provider.authentication.OAuth2AuthenticationManager
#authenticate{ 
OAuth2Authentication auth = tokenServices.loadAuthentication(token);//这里的tokenServices就是上面的UserInfoTokenServices Bean,就在这里向授权服务器发出请求. 
} 

三.UI服务器作为SSO的客户端. 

1.同样UI服务器不需要Spring Session,认证如我们所期望的,交给授权服务器,所以使用Spring Security OAuth2依赖替换Spring Session和Redis依赖
2.当然UI服务器还是API网关的角色,所以不要移除@EnableZuulProxy
在UI服务器主类加上@EnableOAuth2Sso,这个注解会帮我们完成跳转到授权服务器,当然要些配置application.yml

zuul:
  routes:
    resource:
      path: /resource/**
      url: http://localhost:9000
    user:
      path: /user/**
      url: http://localhost:9999/uaa/user

这里将”/user”请求代理到授权服务器 

3.继续修改UI主类继承WebSecurityConfigurerAdapter,重写org.springframework.security.config.annotation.web.configuration.WebSecurityConfigurerAdapter
#configure(org.springframework.security.config.annotation.web.builders.HttpSecurity) 
目的是为了修改@EnableOAuth2Sso引起的默认Filter链,默认是org.springframework.boot.autoconfigure.security.oauth2.client.OAuth2SsoDefaultConfiguration
#configure,
这个类上面有@Conditional(NeedsWebSecurityCondition.class)意思应该是,没有WebSecurityConfigurerAdapter才会去执行这个config,
因为继承了这个类,所以此config不再执行. 

4.作为oauth2的客户端,application.yml下面这几项是少不了的

security:
  oauth2:
    client:
      accessTokenUri: http://localhost:9999/uaa/oauth/token
      userAuthorizationUri: http://localhost:9999/uaa/oauth/authorize
      clientId: acme
      clientSecret: acmesecret
    resource:
      userInfoUri: http://localhost:9999/uaa/user

最后一项,因为也作为资源服务器,所以也加上吧

spring:
  aop:
    proxy-target-class: true

spring aop默认一般都是使用jdk生成代理,前提是要有接口,cglib生成代理,目标类不能是final类,这是最基本的条件.
估计是那些restTemplate没有实现接口,所以不得不在这里使用cglib生成代理. 

5.其它的前端微小改变,这里不赘述.把授权服务器,分离的资源服务器和这个UI服务器都启动.准备测试:http://localhost:8080/login 
a.经过security的拦截链接中的
org.springframework.security.oauth2.client.filter.OAuth2ClientAuthenticationProcessingFilter.doFilter拦截,
触发了attemptAuthentication方法

    public OAuth2AccessToken getAccessToken() throws UserRedirectRequiredException {
        OAuth2AccessToken accessToken = context.getAccessToken();
        if (accessToken == null || accessToken.isExpired()) {
            try {
                accessToken = acquireAccessToken(context);
            } catch (UserRedirectRequiredException e) {
                context.setAccessToken(null); // No point hanging onto it now
                accessToken = null;
                String stateKey = e.getStateKey();
                if (stateKey != null) {
                    Object stateToPreserve = e.getStateToPreserve();
                    if (stateToPreserve == null) {
                        stateToPreserve = "NONE";
                    }
                    context.setPreservedState(stateKey, stateToPreserve);
                }
                throw e;
            }
        }
        return accessToken;
    }

acquireAccessToken(context)去获取token的时候触发抛异常.
在org.springframework.security.oauth2.client.token.grant.code.AuthorizationCodeAccessTokenProvider
#getRedirectForAuthorization处理发送的url,
最后这个UserRedirectRequiredException往上抛，
一直往上抛到org.springframework.security.oauth2.client.filter.OAuth2ClientContextFilter#doFilter

    catch (Exception ex) {
        // Try to extract a SpringSecurityException from the stacktrace
        Throwable[] causeChain = throwableAnalyzer.determineCauseChain(ex);
        UserRedirectRequiredException redirect = (UserRedirectRequiredException) throwableAnalyzer
                .getFirstThrowableOfType(
                        UserRedirectRequiredException.class, causeChain);
        if (redirect != null) {
            redirectUser(redirect, request, response);
        } else {
            if (ex instanceof ServletException) {
                throw (ServletException) ex;
            }
            if (ex instanceof RuntimeException) {
                throw (RuntimeException) ex;
            }
            throw new NestedServletException("Unhandled exception", ex);
        }
    }

终于看到redirectUser(redirect, request, response);进行跳转到授权服务器去了.

授权服务器跳回到UI服务器原来的地址(带回来授权许可码),再次被OAuth2ClientAuthenticationProcessingFilter拦截发送获取accessToken,
经org.springframework.security.oauth2.client.token.OAuth2AccessTokenSupport
#retrieveToken提交POST请求,获取到返回原来发请求处得到OAuth2AccessToken对象. 

在org.springframework.security.oauth2.client.OAuth2RestTemplate#acquireAccessToken使用oauth2Context.setAccessToken(accessToken);
对token进行保存.有了accessToken,就可以从授权服务器获取用户信息了.

最后,当用户点logout的时候,授权服务器根本没有退出(销毁认证授权信息)

http://blog.csdn.net/xiejx618/article/details/51039653