Burp验证码本地识别插件开发教程<\/h1>

1. 开发背景与目的<\/h2>

本教程将指导您开发一个Burp Suite插件，用于本地识别简单的图片验证码。该插件主要针对以下场景：<\/p>

测试仍使用简单图片验证码的陈旧web系统<\/li>
避免依赖收费验证码识别服务<\/li>

提供本地化解决方案，提高测试效率<\/li> <\/ul>

2. 开发环境准备<\/h2>

必备组件<\/h3>

操作系统：Windows 7 x64（其他版本也可）<\/li>
Java环境：Java 1.8.0_161 32位版本<\/strong>（关键）<\/li>
开发工具：NetBeans IDE 8.2<\/li>

Burp Suite版本：1.7.33社区版<\/li> <\/ul>
注意事项<\/h3>

必须使用32位Java JDK，因为依赖的DLL文件只有32位版本<\/li>
管理员权限运行Burp Suite<\/li> <\/ul>
3. 验证码识别方案选择<\/h2>
方案一：通用英数识别（X_CNN）<\/h3>

特点：通用识别，适合简单数字字母验证码<\/li>
优点：识别效率尚可<\/li>
缺点：资源消耗较大，无源代码，需转换为DLL使用<\/li>
文件：cnn.dll<\/li> <\/ul>
方案二：完美验证码识别系统<\/h3>

特点：可自定义训练验证码模型<\/li>
优点：支持简单图片验证码训练<\/li>
缺点：需要自行训练字库<\/li>
文件：CClib.dll及相关字库文件（如liangjing.dat）<\/li> <\/ul>
4. 开发步骤详解<\/h2>
4.1 创建Java项目<\/h3>

使用NetBeans新建Java项目（命名为Releasel0ck）<\/li>
创建名为GUI的JPanel窗体<\/li> <\/ol>
4.2 图形界面设计<\/h3>

拖拽控件构建用户界面<\/li>
主要组件包括：

验证码图片显示区域<\/li>
识别结果展示区域<\/li>
识别方式选择控件<\/li>
操作按钮（识别、清除等）<\/li> <\/ul> <\/li> <\/ul>
4.3 DLL调用实现<\/h3>
使用JNA（Java Native Access）类库调用DLL：<\/p>
\/\/ 定义DLL接口 <\/span><\/span><\/span><\/span>public<\/span> interface<\/span> CLibrary<\/span> extends<\/span> Library {<\/span> <\/span><\/span> CLibrary INSTANCE =<\/span> (<\/span>CLibrary)<\/span> Native.<\/span>loadLibrary<\/span>(<\/span> <\/span><\/span> (<\/span>Platform.<\/span>isWindows<\/span>()<\/span> ?<\/span> "msvcrt"<\/span> :<\/span> "c"<\/span>),<\/span> <\/span><\/span> CLibrary.<\/span>class<\/span>);<\/span> <\/span><\/span> <\/span><\/span> \/\/ 声明DLL中的函数 <\/span><\/span><\/span><\/span> String X_CNN<\/span>(<\/span>String imgPath);<\/span> <\/span><\/span>}<\/span> <\/span><\/span><\/code><\/pre>4.4 Burp插件核心开发<\/h3> 4.4.1 基本结构<\/h4> 导入Burp Java API<\/li> 创建BurpExtender类<\/li> 实现必要的插件接口<\/li> <\/ol> 4.4.2 关键功能实现<\/h4> 将GUI集成到Burp：<\/strong><\/p> public<\/span> class<\/span> BurpExtender<\/span> implements<\/span> IBurpExtender,<\/span> ITab {<\/span> <\/span><\/span> private<\/span> JPanel panel;<\/span> <\/span><\/span> <\/span><\/span> @Override<\/span> <\/span><\/span> public<\/span> void<\/span> registerExtenderCallbacks<\/span>(<\/span>IBurpExtenderCallbacks callbacks)<\/span> {<\/span> <\/span><\/span> this<\/span>.<\/span>callbacks<\/span> =<\/span> callbacks;<\/span> <\/span><\/span> callbacks.<\/span>setExtensionName<\/span>(<\/span>"Releasel0ck Captcha"<\/span>);<\/span> <\/span><\/span> <\/span><\/span> \/\/ 创建GUI <\/span><\/span><\/span><\/span> panel =<\/span> new<\/span> GUI();<\/span> <\/span><\/span> <\/span><\/span> \/\/ 添加自定义标签页 <\/span><\/span><\/span><\/span> callbacks.<\/span>addSuiteTab<\/span>(<\/span>this<\/span>);<\/span> <\/span><\/span> }<\/span> <\/span><\/span> <\/span><\/span> @Override<\/span> <\/span><\/span> public<\/span> Component getUiComponent<\/span>()<\/span> {<\/span> <\/span><\/span> return<\/span> panel;<\/span> <\/span><\/span> }<\/span> <\/span><\/span>}<\/span> <\/span><\/span><\/code><\/pre>验证码识别核心逻辑：<\/strong><\/p> public<\/span> String recognizeCaptcha<\/span>(<\/span>String imagePath)<\/span> {<\/span> <\/span><\/span> \/\/ 根据选择的识别方式调用不同DLL <\/span><\/span><\/span><\/span> if<\/span>(<\/span>usePerfectSystem)<\/span> {<\/span> <\/span><\/span> return<\/span> PerfectSystem.<\/span>INSTANCE<\/span>.<\/span>recognize<\/span>(<\/span>imagePath);<\/span> <\/span><\/span> }<\/span> else<\/span> {<\/span> <\/span><\/span> return<\/span> X_CNN.<\/span>INSTANCE<\/span>.<\/span>X_CNN<\/span>(<\/span>imagePath);<\/span> <\/span><\/span> }<\/span> <\/span><\/span>}<\/span> <\/span><\/span><\/code><\/pre>图片处理辅助类：<\/strong><\/p> requestHelper<\/code>类：发送请求、获取并保存验证码图片<\/li> imageType<\/code>类：判断图片类型（直接复用reCAPTCHA插件中的代码）<\/li> <\/ul> 4.5 文件部署要求<\/h3> discriminate<\/code>文件夹必须与burp.jar同级目录<\/li> 包含所有必要的DLL文件： cnn.dll（通用识别）<\/li> CClib.dll（完美验证码系统）<\/li> 自定义字库文件（如liangjing.dat）<\/li> <\/ul> <\/li> <\/ul> 5. 测试与使用<\/h2> 5.1 测试准备<\/h3> 以管理员身份运行CMD<\/li> 执行命令：java -jar burpsuite_community_1.7.33.jar<\/code><\/li> <\/ol> 5.2 通用识别测试<\/h3> 可能出现DLL加载错误<\/li> 解决方案：将CClib.dll放入指定目录<\/li> <\/ul> 5.3 完美验证码系统测试<\/h3> 需准备训练好的字库文件（如liangjing.dat）<\/li> 密码：liangjing<\/li> <\/ul> 5.4 Intruder模块集成测试<\/h3> 选择插件作为Payload生成器<\/li> 固定测试账号和密码<\/li> 启动攻击<\/li> 观察验证码识别结果：成功：正确识别验证码<\/li> 失败：识别错误（需改进字库或算法）<\/li> <\/ul> <\/li> <\/ol> 6. 已知问题与改进方向<\/h2> 当前限制<\/h3> 验证码识别错误时无法自动重试<\/li> 部分复杂验证码识别率低<\/li> 资源占用较高<\/li> <\/ol> 改进建议<\/h3> 实现错误自动检测和重试机制<\/li> 优化字库训练流程<\/li> 添加更多验证码识别引擎支持<\/li> 改进资源管理<\/li> <\/ol> 7. 资源与参考<\/h2> 通用英数识别系统讨论： https:\/\/bbs.125.la\/forum.php?mod=viewthread&tid=14104886<\/li> 完美验证码识别系统： https:\/\/bbs.125.la\/forum.php?mod=viewthread&tid=14015752<\/li> reCAPTCHA插件源码（参考实现）<\/li> <\/ol> 8. 结论<\/h2> 本教程详细介绍了开发Burp验证码本地识别插件的全过程，从环境准备到核心功能实现，再到测试部署。通过这个插件，安全测试人员可以更高效地处理带有简单验证码的系统测试工作。开发者可以根据实际需求进一步扩展和完善功能。<\/p>