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<p><code>WebRTC</code>与<code>p2p</code>连通条件相似，但是因为浏览器处于沙箱环境，没有原生代码能直接固定内网原端口，无视安全风险的能力和相关权限，所以如果除去中继服务器的话，<code>nat4</code>的连接会很不稳定</p>
<p> <strong>全锥型 vs 对称型</strong>：不需要预测，基本能秒连。</p>
<p> <strong>受限型 vs 对称型</strong>：需要预测（或者叫端口试探）。</p>
<p> <strong>对称型 vs 对称型</strong>：预测基本没戏，一般只能走 TURN。</p>
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<h1 id="0-前言"><a href="#0-前言" class="headerlink" title="0-前言"></a>0-前言</h1><p> 针对<code>web</code>前端的<code>js</code>的绕过登录、赋值、反调试、混淆对抗以及加解密签名的一些记录心得，<code>js</code>的逆向存在和安卓逆向相似的部分例如：调用栈<code>trace</code>和动态的“指针”<code>this</code>记录在末尾；</p>
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<h1 id="0-前言"><a href="#0-前言" class="headerlink" title="0-前言"></a>0-前言</h1><p>记录一下<code>hexo</code>的<code>next</code>主题的一些文件是在哪些位置，以防下次想改又要去找，至于怎么改，丢给文本模型跑就行了</p>
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<h1 id="0-前言"><a href="#0-前言" class="headerlink" title="0-前言"></a>0-前言</h1><p> 记录<code>fastjson</code>的漏洞的测试心得,更为详细的可以参考大佬的安全笔记<a target="_blank" rel="noopener" href="https://github.com/javaweb-sec/javaweb-sec">Java Web安全</a></p>
<p><strong>第一步看报错类型。</strong></p>
<p>构建报错类查看报错：<code>{@type:xxx.class,val:xxx.String}</code>等<code>json</code>;<br>如果是 <code>type not match</code>，通常是顶层类型和接口期望类型不一致；如果是 <code>autoType is not support</code>，说明已经进了 Fastjson 的类型安全检查；如果返回的是业务提示，比如“请输入id”，说明对象已经成功落到业务层。这个区分对定位问题非常关键。你前面的日志已经足够证明：业务类可反序列化，危险类被拦截。</p>
<p><strong>第二步看版本与配置。</strong><br> 优先从代码依赖、jar 文件名、启动参数、<code>fastjson.properties</code>、异常堆栈里确认版本和是否启用了 <code>safeMode</code>。Fastjson 官方文档明确给了三种开启 safeMode 的方式，且 safeMode 打开后会完全禁用 autoType。Fastjson 2.x 则是默认禁用 autoType、以更安全的方式设计。</p>
<p><strong>第三步看“是否存在 AutoType”。</strong><br> 不是只看能不能写 <code>@type</code>，而是看它能不能把类型落到你控制的类上。你这里 <code>GetxxxParam</code> 能进业务层，说明接口的对象绑定链路存在；但 <code>BasicDataSource</code> 被拒，说明高危类型没过安全门槛。</p>
<p><strong>第四步看是否“可绕过”。</strong><br> 可以直接按版本和官方公告判断：1.2.83 之前存在被修复的绕过问题，1.2.68 起有 safeMode；如果目标已经开了 safeMode，autoType 会被完全关闭。</p>
<p><strong>第五步，不能绕过时就做业务类审计。</strong><br>没有历史漏洞则真正能做的部分：反编译 <code>GetxxxParam</code>(对应的业务类)，看 setter、构造函数、字段类型、后续 controller/service 是否会继续调用它的方法。<code>Fastjson</code> 官方也提供了 <code>AutoTypeCheckHandler</code> 这类扩展点，说明很多场景最终要回到应用自己的类型与业务逻辑上看。</p>
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