feat: 增加SMTP扫描

Plugins/SMTP.go

@@ -0,0 +1,101 @@
+package Plugins
+
+import (
+	"fmt"
+	"github.com/shadow1ng/fscan/Common"
+	"net"
+	"net/smtp"
+	"strings"
+	"time"
+)
+
+// SmtpScan 执行 SMTP 服务扫描
+func SmtpScan(info *Common.HostInfo) (tmperr error) {
+	if Common.DisableBrute {
+		return
+	}
+
+	starttime := time.Now().Unix()
+
+	// 首先测试匿名访问
+	flag, err := SmtpConn(info, "", "")
+	if flag && err == nil {
+		return err
+	}
+
+	// 尝试用户名密码组合
+	for _, user := range Common.Userdict["smtp"] {
+		for _, pass := range Common.Passwords {
+			pass = strings.Replace(pass, "{user}", user, -1)
+
+			flag, err := SmtpConn(info, user, pass)
+			if flag && err == nil {
+				return err
+			}
+
+			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, user, pass, err)
+			Common.LogError(errlog)
+			tmperr = err
+
+			if Common.CheckErrs(err) {
+				return err
+			}
+
+			// 超时检查
+			if time.Now().Unix()-starttime > (int64(len(Common.Userdict["smtp"])*len(Common.Passwords)) * Common.Timeout) {
+				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("[email protected]")
+	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
+}