fscan/plugins/services/mysql.go

package services

import (
	"context"
	"database/sql"
	"fmt"
	"net"
	"time"

	_ "github.com/go-sql-driver/mysql"
	"github.com/shadow1ng/fscan/common"
)

type MySQLPlugin struct {
	name  string
	ports []int
}

func NewMySQLPlugin() *MySQLPlugin {
	return &MySQLPlugin{
		name:  "mysql",
		ports: []int{3306, 3307, 33060},
	}
}

func (p *MySQLPlugin) Name() string {
	return p.name
}

func (p *MySQLPlugin) GetPorts() []int {
	return p.ports
}

func (p *MySQLPlugin) Scan(ctx context.Context, info *common.HostInfo) *ScanResult {
	target := fmt.Sprintf("%s:%s", info.Host, info.Ports)

	if common.DisableBrute {
		return p.identifyService(info)
	}

	credentials := GenerateCredentials("mysql")
	if len(credentials) == 0 {
		return &ScanResult{
			Success: false,
			Service: "mysql",
			Error:   fmt.Errorf("没有可用的测试凭据"),
		}
	}

	for _, cred := range credentials {
		if p.testCredential(ctx, info, cred) {
			common.LogSuccess(fmt.Sprintf("MySQL %s %s:%s", target, cred.Username, cred.Password))
			
			return &ScanResult{
				Success:  true,
				Service:  "mysql",
				Username: cred.Username,
				Password: cred.Password,
			}
		}
	}

	return &ScanResult{
		Success: false,
		Service: "mysql",
		Error:   fmt.Errorf("未发现弱密码"),
	}
}

func (p *MySQLPlugin) testCredential(ctx context.Context, info *common.HostInfo, cred Credential) bool {
	connStr := fmt.Sprintf("%s:%s@tcp(%s:%s)/mysql?charset=utf8&timeout=%ds",
		cred.Username, cred.Password, info.Host, info.Ports, common.Timeout)
	
	db, err := sql.Open("mysql", connStr)
	if err != nil {
		return false
	}
	defer db.Close()

	db.SetConnMaxLifetime(time.Duration(common.Timeout) * time.Second)
	db.SetMaxOpenConns(1)
	db.SetMaxIdleConns(0)

	err = db.PingContext(ctx)
	return err == nil
}


func (p *MySQLPlugin) identifyService(info *common.HostInfo) *ScanResult {
	target := fmt.Sprintf("%s:%s", info.Host, info.Ports)

	conn, err := common.WrapperTcpWithTimeout("tcp", target, time.Duration(common.Timeout)*time.Second)
	if err != nil {
		return &ScanResult{
			Success: false,
			Service: "mysql",
			Error:   err,
		}
	}
	defer conn.Close()

	if banner := p.readMySQLBanner(conn); banner != "" {
		common.LogSuccess(fmt.Sprintf("MySQL %s %s", target, banner))
		return &ScanResult{
			Success: true,
			Service: "mysql",
			Banner:  banner,
		}
	}

	return &ScanResult{
		Success: false,
		Service: "mysql",
		Error:   fmt.Errorf("无法识别为MySQL服务"),
	}
}

func (p *MySQLPlugin) readMySQLBanner(conn net.Conn) string {
	conn.SetReadDeadline(time.Now().Add(time.Duration(common.Timeout) * time.Second))

	handshake := make([]byte, 256)
	n, err := conn.Read(handshake)
	if err != nil || n < 10 {
		return ""
	}

	if handshake[4] != 10 {
		return ""
	}

	versionStart := 5
	versionEnd := versionStart
	for versionEnd < n && handshake[versionEnd] != 0 {
		versionEnd++
	}

	if versionEnd <= versionStart {
		return ""
	}

	versionStr := string(handshake[versionStart:versionEnd])
	return fmt.Sprintf("MySQL %s", versionStr)
}


func init() {
	// 使用高效注册方式：直接传递端口信息，避免实例创建
	RegisterPluginWithPorts("mysql", func() Plugin {
		return NewMySQLPlugin()
	}, []int{3306, 3307, 33060})
}