package Plugins

import (
	"fmt"
	"github.com/go-ldap/ldap/v3"
	"github.com/shadow1ng/fscan/Common"
	"strings"
	"time"
)

// LDAPScan 执行LDAP服务扫描
func LDAPScan(info *Common.HostInfo) (tmperr error) {
	if Common.DisableBrute {
		return
	}

	starttime := time.Now().Unix()

	// 尝试匿名访问
	flag, err := LDAPConn(info, "", "")
	if flag && err == nil {
		return err
	}

	// 尝试用户名密码组合
	for _, user := range Common.Userdict["ldap"] {
		for _, pass := range Common.Passwords {
			pass = strings.Replace(pass, "{user}", user, -1)

			flag, err := LDAPConn(info, user, pass)
			if flag && err == nil {
				return err
			}

			errlog := fmt.Sprintf("[-] LDAP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
			}

			if time.Now().Unix()-starttime > (int64(len(Common.Userdict["ldap"])*len(Common.Passwords)) * Common.Timeout) {
				return err
			}
		}
	}
	return tmperr
}

// LDAPConn 尝试LDAP连接
func LDAPConn(info *Common.HostInfo, user string, pass string) (bool, error) {
	host, port := info.Host, info.Ports
	timeout := time.Duration(Common.Timeout) * time.Second

	// 构造LDAP连接地址
	address := fmt.Sprintf("%s:%s", host, port)

	// 配置LDAP连接
	l, err := ldap.Dial("tcp", address)
	if err != nil {
		return false, err
	}
	defer l.Close()

	// 设置超时
	l.SetTimeout(timeout)

	// 尝试绑定
	if user != "" {
		// 构造DN
		bindDN := fmt.Sprintf("cn=%s,dc=example,dc=com", user)
		err = l.Bind(bindDN, pass)
	} else {
		// 匿名绑定
		err = l.UnauthenticatedBind("")
	}

	if err != nil {
		return false, err
	}

	// 尝试简单搜索以验证权限
	searchRequest := ldap.NewSearchRequest(
		"dc=example,dc=com",
		ldap.ScopeWholeSubtree, ldap.NeverDerefAliases, 0, 0, false,
		"(objectClass=*)",
		[]string{"dn"},
		nil,
	)

	_, err = l.Search(searchRequest)
	if err != nil {
		return false, err
	}

	// 记录成功结果
	result := fmt.Sprintf("[+] LDAP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 += "匿名访问成功"
	}
	Common.LogSuccess(result)

	return true, nil
}