shiro拦截认证

时间:2022-05-24 IM@taoyalong 人气:0

概述

Shiro是apache旗下一个开源安全框架(http://shiro.apache.org/)，它将软件系统的安全认证相关的功能抽取出来，实现用户身份认证，权限授权、加密、会话管理等功能，组成了一个通用的安全认证框架。使用shiro就可以非常快速的完成认证、授权等功能的开发，降低系统成本。

Shiro框架三大核心对象

说明：

1)Subject :主体对象，负责提交用户认证和授权信息。

2)SecurityManager：安全管理器，负责认证，授权等业务实现。（核心）

3)Realm：领域对象，负责从数据层获取业务数据。

shrio 拦截认证全过程

1.FilterRegistrationBean过滤注册bean

@Bean
public FilterRegistrationBean shiroFilterRegistration() {
    FilterRegistrationBean registration = new FilterRegistrationBean();
    registration.setFilter(new DelegatingFilterProxy("shiroFilter"));
    //该值缺省为false，表示生命周期由SpringApplicationContext管理，设置为true则表示由ServletContainer管理
    registration.addInitParameter("targetFilterLifecycle", "true");
    registration.setEnabled(true);
    registration.setOrder(Integer.MAX_VALUE - 1);
    registration.addUrlPatterns("/*");
    return registration;
}

设置过滤的bean

2.shiroFilter 实际过滤配置bean

@Bean("shiroFilter")
public ShiroFilterFactoryBean shirFilter(SecurityManager securityManager) {
    ShiroFilterFactoryBean shiroFilter = new ShiroFilterFactoryBean();
    shiroFilter.setSecurityManager(securityManager);

    //oauth过滤
    Map<String, Filter> filters = new HashMap<>(10);
    filters.put("oauth2", new Oauth2Filter());
    shiroFilter.setFilters(filters);

    Map<String, String> filterMap = new LinkedHashMap<>();
    filterMap.put("/webjars/**", "anon");
    filterMap.put("/druid/**", "anon");
    filterMap.put("/login", "anon");

    filterMap.put("/**", "oauth2");
    shiroFilter.setFilterChainDefinitionMap(filterMap);

    return shiroFilter;
}

配置oauth2Filter为过滤类过滤对象处/webjars/** /druid/** /login 外的所有

3.过滤类Oauth2Filter 继承 AuthenTicationFilter 重写以下方法

/**
 * 验证是否有效token
 * @param request re
 * @param response res
 * @return 验证token
 * @throws Exception
 */
@Override
protected boolean onAccessDenied(ServletRequest request, ServletResponse response) throws Exception {
    //获取请求token，如果token不存在，直接返回401
    String token = getRequestToken((HttpServletRequest) request);
    if(StringUtils.isBlank(token)){
        HttpServletResponse httpResponse = (HttpServletResponse) response;
        httpResponse.setContentType("application/json;charset=utf-8");
        httpResponse.setHeader("Access-Control-Allow-Credentials", "true");
        httpResponse.setHeader("Access-Control-Allow-Origin", HttpContextUtils.getOrigin());

        String json = new Gson().toJson(new Result().error(ErrorCode.UNAUTHORIZED));

        httpResponse.getWriter().print(json);

        return false;
    }

    return executeLogin(request, response);
}

4.调用父类 executeLogin 进行登录验证

protected boolean executeLogin(ServletRequest request, ServletResponse response) throws Exception {
    AuthenticationToken token = this.createToken(request, response);
    if (token == null) {
        String msg = "createToken method implementation returned null. A valid non-null AuthenticationToken must be created in order to execute a login attempt.";
        throw new IllegalStateException(msg);
    } else {
        try {
            Subject subject = this.getSubject(request, response);
            subject.login(token);
            return this.onLoginSuccess(token, subject, request, response);
        } catch (AuthenticationException var5) {
            return this.onLoginFailure(token, var5, request, response);
        }
    }
}

5.subject.login(token); 进行登录

login方法被DelegatingSubject重写

public void login(AuthenticationToken token) throws AuthenticationException {
    **
    Subject subject = this.securityManager.login(this, token);
    **
}

6.securityManager.login(this, token) login被DefaultSecurityManager

接下来几步没那么重要省略部分

7.ModularRealmAuthenticator AuthenticationInfo 授权信息获取方法

protected AuthenticationInfo doAuthenticate(AuthenticationToken authenticationToken) throws AuthenticationException {
    this.assertRealmsConfigured();
    Collection<Realm> realms = this.getRealms();
    return realms.size() == 1 ? this.doSingleRealmAuthentication((Realm)realms.iterator().next(), authenticationToken) : this.doMultiRealmAuthentication(realms, authenticationToken);
}

getRealms 获取我们自己重写的Realms类，主要用户获取用户信息

8.接下来则进入我们自己写的Realms类我的类叫Oauth2Realm

/**
 * 认证(登录时调用)
 */
@Override
protected AuthenticationInfo doGetAuthenticationInfo(AuthenticationToken token) throws AuthenticationException {
    String accessToken = (String) token.getPrincipal();

    //根据accessToken，查询用户信息
    SysUserTokenEntity tokenEntity = shiroService.getByToken(accessToken);
    //token失效
    if(tokenEntity == null || tokenEntity.getExpireDate().getTime() < System.currentTimeMillis()){
        throw new IncorrectCredentialsException(MessageUtils.getMessage(ErrorCode.TOKEN_INVALID));
    }

    //查询用户信息
    SysUserEntity userEntity = shiroService.getUser(tokenEntity.getUserId());

    //转换成UserDetail对象
    UserDetail userDetail = ConvertUtils.sourceToTarget(userEntity, UserDetail.class);

    //获取用户对应的部门数据权限
    List<Long> deptIdList = shiroService.getDataScopeList(userDetail.getId());
    userDetail.setDeptIdList(deptIdList);

    //账号锁定
    if(userDetail.getStatus() == 0){
        throw new LockedAccountException(MessageUtils.getMessage(ErrorCode.ACCOUNT_LOCK));
    }

    SimpleAuthenticationInfo info = new SimpleAuthenticationInfo(userDetail, accessToken, getName());
    return info;
}

负责获取用户信息的方法

这并不是登录的过程，而是授权过滤的过程，通过token到数据库查询是否有这个用户，且没有过期，则证明已经登录。

总结

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