shiro源码分析

- 日理万妓 2023-06-25 14:28 52阅读 0赞

### 文章目录 ###

*   *  个人学习路线
     *  简单介绍
     *  怎么进行认证(登录)的
     *   *  SecurityManager详解
         *  CachingSecurityManager
         *  RealmSecurityManager
         *  AuthenticatingSecurityManager
         *  AuthorizingSecurityManager
         *  SessionsSecurityManager
         *  认证总结
     *  怎么进行鉴权(判断是否有权限)的
     *  授权
     *  总结,以前在使用shiro的回想

## 个人学习路线 ##

> Apache Shiro是一个功能强大且灵活的开源安全框架，可以清晰地处理身份验证，授权，企业会话管理和加密。

这是它的官网:

[官网][Link 1]  
在官网上面有个快速开始,将源码下载下来,  
看看shiro的大体架构:http://shiro.apache.org/architecture.html  
我就贴一张最重要的图好了,官网介绍的更加清楚.  
![在这里插入图片描述][20191229181241298.png]

跑一遍快速开始:  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM4MzY2MDYz_size_16_color_FFFFFF_t_70]  
这时候对shiro有个简单的了解了…

## 简单介绍 ##

ini配置文件:

# 用户名,密码,角色
    [users]
    root = secret, admin
    guest = guest, guest
    
    presidentskroob = 12345, president
    darkhelmet = ludicrousspeed, darklord, schwartz
    lonestarr = vespa, goodguy, schwartz
    
    $ 角色 ,对应的权限
    [roles]
    admin = *
    schwartz = lightsaber:*,aa:*
    goodguy = winnebago:drive:eagle5,aa:*

简单看看事例代码:

public class Quickstart { 
        private static final transient Logger log = LoggerFactory.getLogger(Quickstart.class);
        public static void main(String[] args) { 
            //创建安全中心
            Factory<SecurityManager> factory = new IniSecurityManagerFactory("classpath:shiro.ini");
            SecurityManager securityManager = factory.getInstance();
            //通过提供的类去简化操作
            SecurityUtils.setSecurityManager(securityManager);
    
            //获取个用户,抽象的用户.
            Subject currentUser = SecurityUtils.getSubject();
    
            //获取session
            Session session = currentUser.getSession();
            session.setAttribute("someKey", "aValue");
            String value = (String) session.getAttribute("someKey");
            if (value.equals("aValue")) { 
                log.info("Retrieved the correct value! [" + value + "]");
            }
    
            //判断是登录
            if (!currentUser.isAuthenticated()) { 
                //用户名密码
                UsernamePasswordToken token = new UsernamePasswordToken("lonestarr", "vespa");
                token.setRememberMe(true);
                try { 
                    //登录,没有抛出异常就是认证成功,抛出了就是登录失败了.
                    currentUser.login(token);
                    //各种异常,顾名思义.账户不存在啊,密码错误啊,用户锁住了等等..
                } catch (UnknownAccountException uae) { 
                    log.info("There is no user with username of " + token.getPrincipal());
                } catch (IncorrectCredentialsException ice) { 
                    log.info("Password for account " + token.getPrincipal() + " was incorrect!");
                } catch (LockedAccountException lae) { 
                    log.info("The account for username " + token.getPrincipal() + " is locked. " +
                            "Please contact your administrator to unlock it.");
                }
                catch (AuthenticationException ae) { 
                    //unexpected condition? error?
                }
            }
    
            //登录成功,获取用户
            log.info("User [" + currentUser.getPrincipal() + "] logged in successfully.");
    
            //是否有指定的角色
            if (currentUser.hasRole("schwartz")) { 
                log.info("May the Schwartz be with you!");
            } else { 
                log.info("Hello, mere mortal.");
            }
    
            //是否有指定的权限
            if (currentUser.isPermitted("lightsaber:weild")) { 
                log.info("You may use a lightsaber ring. Use it wisely.");
            } else { 
                log.info("Sorry, lightsaber rings are for schwartz masters only.");
            }
    
          
            //退出
            currentUser.logout();
    
            System.exit(0);
        }
    }

## 怎么进行认证(登录)的 ##

代码是通过subject调用login方法登录,点到具体实现.  
DelegatingSubject这个类实现了Subject,实现了login方法:

Subject currentUser = SecurityUtils.getSubject();
       currentUser.login(token);

### SecurityManager详解 ###

我们看默认的实现DefaultSecurityManager类的uml图,  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM4MzY2MDYz_size_16_color_FFFFFF_t_70 1]  
DefaultSecurityManager继承了SessionsSecurityManager(可以进行session管理)->AuthorizingSecurityManager(可以进行鉴权)->AuthenticatingSecurityManager(可以进行认证)->RealmSecurityManager(可以进行real管理)->CachingSecurityManager(缓存管理了);这不是很明显的装饰者吗?

### CachingSecurityManager ###

这是CachingSecurityManager有CacheManager接口,我们可以实现自己的缓存管理,可以放在redis里,或者mysql,或者整合ehcache等等.然后可以set,get方便扩展.  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM4MzY2MDYz_size_16_color_FFFFFF_t_70 2]

### RealmSecurityManager ###

RealmSecurityManager内部维护了一个Realm集合,也提供了各种set,get,方便我们扩展.  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM4MzY2MDYz_size_16_color_FFFFFF_t_70 3]

### AuthenticatingSecurityManager ###

内部维护了一个认证器,当然也可以set,get,默认提供了个简单的认证器ModularRealmAuthenticator  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM4MzY2MDYz_size_16_color_FFFFFF_t_70 4]

### AuthorizingSecurityManager ###

内部维护了一个鉴权器,也有默认的,set,get等.  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM4MzY2MDYz_size_16_color_FFFFFF_t_70 5]

### SessionsSecurityManager ###

内部维护了一个session管理器  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM4MzY2MDYz_size_16_color_FFFFFF_t_70 6]

### 认证总结 ###

通过一系列的继承,那这个默认的DefaultSecurityManager就可以使用认证啊,鉴权啊,缓存啊,session啊,real管理啊等各种功能啦!!!  
登录的话,是认证的功能,  
首先通过authenticate方法获取个认证信息authenticate这个方法是认证管理器实现的managerAuthenticatingSecurityManager,使用的认证器去进行认证的,this.authenticator是哪个呢?刚刚说了初始化的时候或设置默认的认证器ModularRealmAuthenticator:  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM4MzY2MDYz_size_16_color_FFFFFF_t_70 7]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM4MzY2MDYz_size_16_color_FFFFFF_t_70 8]  
然后发现实现里面没有authenticate方法,那就说明,在父类里面,***子类里没有的方法就去父类里面找,准没错,父类里的抽象方法,那就去子类里面找实现了***  
然后父类AbstractAuthenticator里面又是调用的doAuthenticate,这个的实现是在ModularRealmAuthenticator认证器里面,然后就是判断是单realm还是多realm分别进行认证.:  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM4MzY2MDYz_size_16_color_FFFFFF_t_70 9]  
先看多realm认证的话会判断,是不是要全部通过,才算认证成功,或者是只要一个认证通过,  
![file][]  
再看单个realm认证doSingleRealmAuthentication方法:就是通过realm的getAuthenticationInfo(AuthenticationToken token)方法 AuthenticatingRealm这个实现的:  
![file][file 1]  
我们看看doGetAuthenticationInfo的简单实现,一般是我们自己去实现的.:  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM4MzY2MDYz_size_16_color_FFFFFF_t_70 10]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM4MzY2MDYz_size_16_color_FFFFFF_t_70 11]  
然后就是进行对比了,默认简单的是通过密码进行equals进行对比的…感兴趣可以看看.  
当然我们也可以自己实现对比器,CredentialsMatcher这个接口,然后set到我们的管理器里面即可;  
对比完成,就是返回认证信息了…  
大体流程,我就把网上图贴上来了:  
![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM4MzY2MDYz_size_16_color_FFFFFF_t_70 12][]

## 怎么进行鉴权(判断是否有权限)的 ##

鉴权主要就是两个方法,判断是否有对应的角色,判断是否有对应的权限,对应的方法是hasRole跟isPermitted  
这两个方法前面讲过,肯定是通过AuthorizingSecurityManager鉴权管理器进行  
就看isPermitted方法好了.  
代理subject里面实现了isPermitted方法:hasPrincipals方法判断是否登录.是否进行了认证,如果没有进行认证,那判断是否含有权限就没有意义了;  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM4MzY2MDYz_size_16_color_FFFFFF_t_70 13]  
然后就是AuthorizingSecurityManager里的实现,通过使用鉴权器进行鉴权,同理,肯定有初始化的鉴权器的,同样是ModularRealmAuthorizer;认证的是ModularRealmAuthenticator名字都是modularRealm开头,哈哈!  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM4MzY2MDYz_size_16_color_FFFFFF_t_70 14]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM4MzY2MDYz_size_16_color_FFFFFF_t_70 15]  
ModularRealmAuthorizer  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM4MzY2MDYz_size_16_color_FFFFFF_t_70 16]  
这里的reaml我们就看sampleRealm好了,先看uml图:  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM4MzY2MDYz_size_16_color_FFFFFF_t_70 17]  
AuthorizingRealm->AuthenticatingRealm->CachingReanm想到了啥,是不是跟跟DefaultSecurityManageer有点相似啊,我就不说了,给个眼神自己体会:  
最后就是取出所有权限,然后进行对比,如果有就代表有权限.![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM4MzY2MDYz_size_16_color_FFFFFF_t_70 18][]

## 授权 ##

然后在判断是否含有指定权限之前,肯定要给用户赋予用户该有的权限吧,  
在AuthorizingRealm的各种鉴权方法里面都会先获取用户的鉴权信息getAuthorizationInfo返回AuthorizationInfo  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM4MzY2MDYz_size_16_color_FFFFFF_t_70 19]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM4MzY2MDYz_size_16_color_FFFFFF_t_70 20]

## 总结,以前在使用shiro的回想 ##

以前做项目的时候总是听别人说,继承AuthorizingRealm然后实现认证,授权两个方法就可以了,shiro就这两个方法,当时也不知道什么原因,只是会用,现在只有通过源码,流程学习,才明白啊!!!  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM4MzY2MDYz_size_16_color_FFFFFF_t_70 21]  
以前也是写个类实现UserDao,其实就是各种操作操作数据库的接口,就是在鉴权里面获取用户啊,权限.等各种信息用的.  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM4MzY2MDYz_size_16_color_FFFFFF_t_70 22]

[Link 1]: http://shiro.apache.org/
[20191229181241298.png]: https://img-blog.csdnimg.cn/20191229181241298.png
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[file]: https://imgconvert.csdnimg.cn/aHR0cDovL3lpZGFibG9nLmluZWV0cy5jb20vcWluaXUvMWJkY2Q3MGEyYWZkYzkzOTNhMTBiYWRlYWIyMDliZDQucG5n?x-oss-process=image/format,png
[file 1]: https://imgconvert.csdnimg.cn/aHR0cDovL3lpZGFibG9nLmluZWV0cy5jb20vcWluaXUvZTc4MTI1YmU4MjQ0NzAzODEyMjMzMDJmZTBjYTllMTYucG5n?x-oss-process=image/format,png
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