mirror of
https://github.com/shadow1ng/fscan.git
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83afd0f994
• 新增FTP插件支持标准21端口和常见替代端口 • 实现匿名访问检测和弱密码爆破功能 • 支持自动利用：目录枚举、文件下载测试、文件上传测试 • 集成-nobr模式服务识别和-ne自动利用功能 • 完整的Context超时机制和连接数管理 • 添加中英文国际化消息支持 • 基于新插件架构实现模块化设计 功能特性: - 支持jlaffaye/ftp驱动的FTP协议通信 - 智能识别vsFTPd、ProFTPD等多种FTP服务器 - 三种利用方法：目录结构探测、文件操作测试 - 完整的错误处理和连接限制处理机制
331 lines
9.5 KiB
Go
331 lines
9.5 KiB
Go
package ftp
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import (
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"context"
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"fmt"
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"path/filepath"
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"strings"
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"time"
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ftplib "github.com/jlaffaye/ftp"
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"github.com/shadow1ng/fscan/common"
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"github.com/shadow1ng/fscan/common/i18n"
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"github.com/shadow1ng/fscan/plugins/base"
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)
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// FTPExploiter FTP利用器
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type FTPExploiter struct {
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*base.BaseExploiter
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connector *FTPConnector
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}
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// NewFTPExploiter 创建FTP利用器
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func NewFTPExploiter() *FTPExploiter {
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exploiter := &FTPExploiter{
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BaseExploiter: base.NewBaseExploiter("ftp"),
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connector: NewFTPConnector(),
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}
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// 添加利用方法
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exploiter.setupExploitMethods()
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return exploiter
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}
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// setupExploitMethods 设置利用方法
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func (e *FTPExploiter) setupExploitMethods() {
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// 1. 目录枚举
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dirMethod := base.NewExploitMethod(base.ExploitDataExtraction, "directory_enumeration").
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WithDescription(i18n.GetText("exploit_method_name_directory_enumeration")).
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WithPriority(9).
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WithConditions("has_credentials").
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WithHandler(e.exploitDirectoryEnumeration).
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Build()
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e.AddExploitMethod(dirMethod)
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// 2. 文件下载测试
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downloadMethod := base.NewExploitMethod(base.ExploitDataExtraction, "file_download_test").
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WithDescription(i18n.GetText("exploit_method_name_file_read")).
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WithPriority(8).
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WithConditions("has_credentials").
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WithHandler(e.exploitFileDownloadTest).
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Build()
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e.AddExploitMethod(downloadMethod)
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// 3. 文件上传测试
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uploadMethod := base.NewExploitMethod(base.ExploitFileWrite, "file_upload_test").
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WithDescription(i18n.GetText("exploit_method_name_file_write")).
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WithPriority(7).
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WithConditions("has_credentials").
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WithHandler(e.exploitFileUploadTest).
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Build()
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e.AddExploitMethod(uploadMethod)
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}
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// exploitDirectoryEnumeration 目录枚举
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func (e *FTPExploiter) exploitDirectoryEnumeration(ctx context.Context, info *common.HostInfo, creds *base.Credential) (*base.ExploitResult, error) {
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return e.executeWithConnection(ctx, info, creds, "directory_enumeration", e.directoryEnumeration)
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}
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// exploitFileDownloadTest 文件下载测试
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func (e *FTPExploiter) exploitFileDownloadTest(ctx context.Context, info *common.HostInfo, creds *base.Credential) (*base.ExploitResult, error) {
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return e.executeWithConnection(ctx, info, creds, "file_download_test", e.fileDownloadTest)
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}
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// exploitFileUploadTest 文件上传测试
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func (e *FTPExploiter) exploitFileUploadTest(ctx context.Context, info *common.HostInfo, creds *base.Credential) (*base.ExploitResult, error) {
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return e.executeWithConnection(ctx, info, creds, "file_upload_test", e.fileUploadTest)
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}
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// executeWithConnection 使用FTP连接执行利用方法
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func (e *FTPExploiter) executeWithConnection(ctx context.Context, info *common.HostInfo, creds *base.Credential, methodName string, method func(context.Context, *ftplib.ServerConn, string) ([]string, error)) (*base.ExploitResult, error) {
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target := fmt.Sprintf("%s:%s", info.Host, info.Ports)
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// 建立FTP连接
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ftpConn, err := ftplib.DialTimeout(target, time.Duration(common.Timeout)*time.Second)
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if err != nil {
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return nil, fmt.Errorf("连接失败: %v", err)
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}
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defer ftpConn.Quit()
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// 登录认证
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err = ftpConn.Login(creds.Username, creds.Password)
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if err != nil {
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return nil, fmt.Errorf("认证失败: %v", err)
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}
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// 执行方法
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output, err := method(ctx, ftpConn, target)
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if err != nil {
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return &base.ExploitResult{
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Success: false,
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Error: err,
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Type: base.ExploitDataExtraction,
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Method: methodName,
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Output: fmt.Sprintf("执行失败: %v", err),
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}, nil
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}
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return &base.ExploitResult{
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Success: true,
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Type: base.ExploitDataExtraction,
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Method: methodName,
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Output: strings.Join(output, "\n"),
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}, nil
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}
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// directoryEnumeration 目录枚举
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func (e *FTPExploiter) directoryEnumeration(ctx context.Context, ftpConn *ftplib.ServerConn, target string) ([]string, error) {
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var output []string
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// 获取当前工作目录
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currentDir, err := ftpConn.CurrentDir()
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if err != nil {
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currentDir = "/"
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}
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output = append(output, fmt.Sprintf("当前工作目录: %s", currentDir))
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// 列举根目录内容
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entries, err := ftpConn.List("")
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if err != nil {
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return nil, fmt.Errorf("列举目录失败: %v", err)
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}
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if len(entries) == 0 {
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output = append(output, "目录为空")
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return output, nil
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}
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// 显示目录内容（限制显示数量）
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maxDisplay := 10
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if len(entries) > maxDisplay {
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output = append(output, fmt.Sprintf("发现 %d 个条目，显示前 %d 个:", len(entries), maxDisplay))
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} else {
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output = append(output, fmt.Sprintf("发现 %d 个条目:", len(entries)))
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}
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dirCount := 0
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fileCount := 0
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for i, entry := range entries {
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if i >= maxDisplay {
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break
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}
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// 格式化文件/目录信息
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entryType := "文件"
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if entry.Type == ftplib.EntryTypeFolder {
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entryType = "目录"
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dirCount++
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} else {
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fileCount++
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}
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// 格式化文件大小
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sizeInfo := ""
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if entry.Type != ftplib.EntryTypeFolder {
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if entry.Size > 1024*1024 {
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sizeInfo = fmt.Sprintf("%.2fMB", float64(entry.Size)/(1024*1024))
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} else if entry.Size > 1024 {
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sizeInfo = fmt.Sprintf("%.2fKB", float64(entry.Size)/1024)
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} else {
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sizeInfo = fmt.Sprintf("%dB", entry.Size)
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}
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}
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// 截断过长的文件名
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name := entry.Name
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if len(name) > 50 {
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name = name[:50] + "..."
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}
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if sizeInfo != "" {
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output = append(output, fmt.Sprintf(" [%s] %s (%s)", entryType, name, sizeInfo))
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} else {
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output = append(output, fmt.Sprintf(" [%s] %s", entryType, name))
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}
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}
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// 添加统计信息
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if len(entries) > maxDisplay {
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output = append(output, fmt.Sprintf("... 还有 %d 个条目未显示", len(entries)-maxDisplay))
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}
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output = append(output, fmt.Sprintf("统计: %d个目录, %d个文件", dirCount, fileCount))
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return output, nil
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}
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// fileDownloadTest 文件下载测试
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func (e *FTPExploiter) fileDownloadTest(ctx context.Context, ftpConn *ftplib.ServerConn, target string) ([]string, error) {
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var output []string
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// 获取目录列表
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entries, err := ftpConn.List("")
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if err != nil {
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return nil, fmt.Errorf("获取文件列表失败: %v", err)
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}
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// 寻找可下载的小文件进行测试
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var testFile *ftplib.Entry
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for _, entry := range entries {
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if entry.Type == ftplib.EntryTypeFile && entry.Size < 10240 { // 小于10KB的文件
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// 过滤一些常见的安全文件
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name := strings.ToLower(entry.Name)
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if !strings.Contains(name, "passwd") &&
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!strings.Contains(name, "shadow") &&
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!strings.Contains(name, "key") &&
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!strings.Contains(name, "config") {
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testFile = entry
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break
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}
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}
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}
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if testFile == nil {
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output = append(output, "未找到合适的测试文件（寻找小于10KB的普通文件）")
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return output, nil
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}
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// 尝试下载测试文件
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response, err := ftpConn.Retr(testFile.Name)
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if err != nil {
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return nil, fmt.Errorf("下载文件失败: %v", err)
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}
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defer response.Close()
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// 读取前1024字节作为测试
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buffer := make([]byte, 1024)
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n, _ := response.Read(buffer)
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output = append(output, fmt.Sprintf("成功下载测试文件: %s", testFile.Name))
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output = append(output, fmt.Sprintf("文件大小: %d 字节", testFile.Size))
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if n > 0 {
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// 检查是否为文本内容
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if isPrintableText(buffer[:n]) {
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preview := string(buffer[:n])
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if len(preview) > 200 {
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preview = preview[:200] + "..."
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}
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output = append(output, fmt.Sprintf("文件内容预览: %s", preview))
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} else {
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output = append(output, "文件为二进制内容")
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}
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}
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return output, nil
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}
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// fileUploadTest 文件上传测试
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func (e *FTPExploiter) fileUploadTest(ctx context.Context, ftpConn *ftplib.ServerConn, target string) ([]string, error) {
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var output []string
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// 测试文件内容
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testFileName := "fscan_test.txt"
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testContent := "This is a test file created by fscan for FTP upload testing."
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// 尝试上传测试文件
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err := ftpConn.Stor(testFileName, strings.NewReader(testContent))
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if err != nil {
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// 尝试上传到常见的上传目录
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uploadDirs := []string{"upload", "uploads", "tmp", "temp", "public"}
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uploaded := false
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for _, dir := range uploadDirs {
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testPath := filepath.Join(dir, testFileName)
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err = ftpConn.Stor(testPath, strings.NewReader(testContent))
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if err == nil {
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output = append(output, fmt.Sprintf("文件上传成功: %s", testPath))
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// 尝试删除测试文件
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if deleteErr := ftpConn.Delete(testPath); deleteErr == nil {
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output = append(output, "测试文件已清理")
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}
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uploaded = true
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break
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}
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}
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if !uploaded {
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return nil, fmt.Errorf("文件上传失败: %v", err)
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}
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} else {
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output = append(output, fmt.Sprintf("文件上传成功: %s", testFileName))
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// 验证文件是否存在
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entries, err := ftpConn.List("")
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if err == nil {
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for _, entry := range entries {
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if entry.Name == testFileName {
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output = append(output, fmt.Sprintf("验证文件存在，大小: %d 字节", entry.Size))
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break
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}
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}
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}
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// 尝试删除测试文件
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if deleteErr := ftpConn.Delete(testFileName); deleteErr == nil {
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output = append(output, "测试文件已清理")
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} else {
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output = append(output, "警告: 无法删除测试文件，请手动清理")
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}
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}
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output = append(output, "FTP上传功能可用")
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return output, nil
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}
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// isPrintableText 检查字节数组是否为可打印文本
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func isPrintableText(data []byte) bool {
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if len(data) == 0 {
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return false
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}
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printableCount := 0
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for _, b := range data {
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if (b >= 32 && b <= 126) || b == '\n' || b == '\r' || b == '\t' {
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printableCount++
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}
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}
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// 如果80%以上是可打印字符，认为是文本
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return float64(printableCount)/float64(len(data)) > 0.8
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} |