package Plugins import ( "fmt" "github.com/shadow1ng/fscan/Common" "net" "net/smtp" "strings" "sync" "time" ) // SmtpScan 执行 SMTP 服务扫描 func SmtpScan(info *Common.HostInfo) (tmperr error) { if Common.DisableBrute { return } maxRetries := Common.MaxRetries threads := Common.BruteThreads // 先测试匿名访问 for retryCount := 0; retryCount < maxRetries; retryCount++ { flag, err := SmtpConn(info, "", "") if flag && err == nil { return err } if err != nil { if retryErr := Common.CheckErrs(err); retryErr != nil { if retryCount == maxRetries-1 { return err } continue } } break } // 创建任务通道 taskChan := make(chan struct { user string pass string }, len(Common.Userdict["smtp"])*len(Common.Passwords)) resultChan := make(chan error, threads) // 生成所有用户名密码组合任务 for _, user := range Common.Userdict["smtp"] { for _, pass := range Common.Passwords { pass = strings.Replace(pass, "{user}", user, -1) taskChan <- struct { user string pass string }{user, pass} } } close(taskChan) // 启动工作线程 var wg sync.WaitGroup for i := 0; i < threads; i++ { wg.Add(1) go func() { defer wg.Done() starttime := time.Now().Unix() for task := range taskChan { // 重试循环 for retryCount := 0; retryCount < maxRetries; retryCount++ { // 检查是否超时 if time.Now().Unix()-starttime > int64(Common.Timeout) { resultChan <- fmt.Errorf("扫描超时") return } // 执行SMTP连接 done := make(chan struct { success bool err error }) go func(user, pass string) { flag, err := SmtpConn(info, user, pass) done <- struct { success bool err error }{flag, err} }(task.user, task.pass) // 等待结果或超时 var err error select { case result := <-done: err = result.err if result.success && err == nil { resultChan <- nil return } case <-time.After(time.Duration(Common.Timeout) * time.Second): err = fmt.Errorf("连接超时") } // 处理错误情况 if err != nil { errlog := fmt.Sprintf("SMTP服务 %v:%v 尝试失败 用户名: %v 密码: %v 错误: %v", info.Host, info.Ports, task.user, task.pass, err) Common.LogError(errlog) // 检查是否需要重试 if retryErr := Common.CheckErrs(err); retryErr != nil { if retryCount == maxRetries-1 { resultChan <- err return } continue // 继续重试 } } break // 如果不需要重试,跳出重试循环 } } resultChan <- nil }() } // 等待所有线程完成 go func() { wg.Wait() close(resultChan) }() // 检查结果 for err := range resultChan { if err != nil { tmperr = err if retryErr := Common.CheckErrs(err); retryErr != nil { return err } } } return tmperr } // SmtpConn 尝试 SMTP 连接 func SmtpConn(info *Common.HostInfo, user string, pass string) (bool, error) { host, port := info.Host, info.Ports timeout := time.Duration(Common.Timeout) * time.Second // 构造地址 addr := fmt.Sprintf("%s:%s", host, port) // 创建带超时的连接 conn, err := net.DialTimeout("tcp", addr, timeout) if err != nil { return false, err } defer conn.Close() // 创建SMTP客户端 client, err := smtp.NewClient(conn, host) if err != nil { return false, err } defer client.Close() // 如果提供了认证信息 if user != "" { auth := smtp.PlainAuth("", user, pass, host) err = client.Auth(auth) if err != nil { return false, err } } // 验证是否可以发送邮件 err = client.Mail("test@test.com") if err != nil { return false, err } // 如果成功 result := fmt.Sprintf("SMTP服务 %v:%v ", host, port) if user != "" { result += fmt.Sprintf("爆破成功 用户名: %v 密码: %v", user, pass) } else { result += "允许匿名访问" } Common.LogSuccess(result) return true, nil }