362 lines
12 KiB
Go
362 lines
12 KiB
Go
package api
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import (
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"context"
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"encoding/base64"
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"errors"
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"path"
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"strconv"
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"time"
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"next-terminal/server/config"
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"next-terminal/server/constant"
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"next-terminal/server/global/session"
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"next-terminal/server/guacd"
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"next-terminal/server/log"
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"next-terminal/server/model"
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"next-terminal/server/utils"
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"github.com/gorilla/websocket"
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"github.com/labstack/echo/v4"
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)
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const (
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TunnelClosed int = -1
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Normal int = 0
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NotFoundSession int = 800
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NewTunnelError int = 801
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ForcedDisconnect int = 802
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AccessGatewayUnAvailable int = 803
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AccessGatewayCreateError int = 804
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AssetNotActive int = 805
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)
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func TunEndpoint(c echo.Context) error {
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ws, err := UpGrader.Upgrade(c.Response().Writer, c.Request(), nil)
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if err != nil {
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log.Errorf("升级为WebSocket协议失败：%v", err.Error())
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return err
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}
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width := c.QueryParam("width")
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height := c.QueryParam("height")
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dpi := c.QueryParam("dpi")
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sessionId := c.QueryParam("sessionId")
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connectionId := c.QueryParam("connectionId")
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intWidth, _ := strconv.Atoi(width)
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intHeight, _ := strconv.Atoi(height)
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configuration := guacd.NewConfiguration()
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propertyMap := propertyRepository.FindAllMap()
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var s model.Session
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if len(connectionId) > 0 {
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s, err = sessionRepository.FindByConnectionId(connectionId)
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if err != nil {
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return err
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}
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if s.Status != constant.Connected {
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return errors.New("会话未在线")
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}
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configuration.ConnectionID = connectionId
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sessionId = s.ID
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configuration.SetParameter("width", strconv.Itoa(s.Width))
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configuration.SetParameter("height", strconv.Itoa(s.Height))
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configuration.SetParameter("dpi", "96")
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} else {
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configuration.SetParameter("width", width)
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configuration.SetParameter("height", height)
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configuration.SetParameter("dpi", dpi)
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s, err = sessionRepository.FindByIdAndDecrypt(sessionId)
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if err != nil {
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return err
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}
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setConfig(propertyMap, s, configuration)
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var (
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ip = s.IP
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port = s.Port
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)
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if s.AccessGatewayId != "" && s.AccessGatewayId != "-" {
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g, err := accessGatewayService.GetGatewayAndReconnectById(s.AccessGatewayId)
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if err != nil {
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disconnect(ws, AccessGatewayUnAvailable, "获取接入网关失败："+err.Error())
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return nil
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}
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if !g.Connected {
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disconnect(ws, AccessGatewayUnAvailable, "接入网关不可用："+g.Message)
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return nil
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}
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exposedIP, exposedPort, err := g.OpenSshTunnel(s.ID, ip, port)
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if err != nil {
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disconnect(ws, AccessGatewayCreateError, "创建SSH隧道失败："+err.Error())
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return nil
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}
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defer g.CloseSshTunnel(s.ID)
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ip = exposedIP
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port = exposedPort
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}
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active, err := utils.Tcping(ip, port)
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if !active {
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disconnect(ws, AssetNotActive, "目标资产不在线: "+err.Error())
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return nil
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}
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configuration.SetParameter("hostname", ip)
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configuration.SetParameter("port", strconv.Itoa(port))
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// 加载资产配置的属性，优先级比全局配置的高，因此最后加载，覆盖掉全局配置
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attributes, err := assetRepository.FindAssetAttrMapByAssetId(s.AssetId)
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if err != nil {
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return err
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}
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if len(attributes) > 0 {
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setAssetConfig(attributes, s, configuration)
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}
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}
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for name := range configuration.Parameters {
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// 替换数据库空格字符串占位符为真正的空格
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if configuration.Parameters[name] == "-" {
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configuration.Parameters[name] = ""
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}
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}
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addr := config.GlobalCfg.Guacd.Hostname + ":" + strconv.Itoa(config.GlobalCfg.Guacd.Port)
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log.Debugf("[%v:%v] 创建guacd隧道[%v]", sessionId, connectionId, addr)
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guacdTunnel, err := guacd.NewTunnel(addr, configuration)
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if err != nil {
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if connectionId == "" {
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disconnect(ws, NewTunnelError, err.Error())
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}
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log.Printf("[%v:%v] 建立连接失败: %v", sessionId, connectionId, err.Error())
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return err
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}
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nextSession := &session.Session{
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ID: sessionId,
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Protocol: s.Protocol,
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Mode: s.Mode,
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WebSocket: ws,
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GuacdTunnel: guacdTunnel,
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}
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if len(s.ConnectionId) == 0 {
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if configuration.Protocol == constant.SSH {
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nextTerminal, err := CreateNextTerminalBySession(s)
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if err == nil {
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nextSession.NextTerminal = nextTerminal
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}
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}
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nextSession.Observer = session.NewObserver(sessionId)
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session.GlobalSessionManager.Add <- nextSession
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go nextSession.Observer.Run()
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sess := model.Session{
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ConnectionId: guacdTunnel.UUID,
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Width: intWidth,
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Height: intHeight,
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Status: constant.Connecting,
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Recording: configuration.GetParameter(guacd.RecordingPath),
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}
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if sess.Recording == "" {
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// 未录屏时无需审计
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sess.Reviewed = true
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}
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// 创建新会话
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log.Debugf("[%v:%v] 创建新会话: %v", sessionId, connectionId, sess.ConnectionId)
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if err := sessionRepository.UpdateById(&sess, sessionId); err != nil {
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return err
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}
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} else {
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// 要监控会话
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forObsSession := session.GlobalSessionManager.GetById(sessionId)
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if forObsSession == nil {
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disconnect(ws, NotFoundSession, "获取会话失败")
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return nil
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}
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nextSession.ID = utils.UUID()
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forObsSession.Observer.Add <- nextSession
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log.Debugf("[%v:%v] 观察者[%v]加入会话[%v]", sessionId, connectionId, nextSession.ID, s.ConnectionId)
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}
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ctx, cancel := context.WithCancel(context.Background())
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tick := time.NewTicker(time.Millisecond * time.Duration(60))
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defer tick.Stop()
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var buf []byte
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dataChan := make(chan []byte)
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go func() {
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GuacdLoop:
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for {
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select {
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case <-ctx.Done():
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log.Debugf("[%v:%v] WebSocket 已关闭，即将关闭 Guacd 连接...", sessionId, connectionId)
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break GuacdLoop
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default:
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instruction, err := guacdTunnel.Read()
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if err != nil {
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log.Debugf("[%v:%v] Guacd 读取失败，即将退出循环...", sessionId, connectionId)
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disconnect(ws, TunnelClosed, "远程连接已关闭")
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break GuacdLoop
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}
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if len(instruction) == 0 {
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continue
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}
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dataChan <- instruction
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}
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}
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log.Debugf("[%v:%v] Guacd 连接已关闭，退出 Guacd 循环。", sessionId, connectionId)
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}()
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go func() {
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tickLoop:
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for {
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select {
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case <-ctx.Done():
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break tickLoop
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case <-tick.C:
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if len(buf) > 0 {
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err = ws.WriteMessage(websocket.TextMessage, buf)
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if err != nil {
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log.Debugf("[%v:%v] WebSocket写入失败，即将关闭Guacd连接...", sessionId, connectionId)
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break tickLoop
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}
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buf = []byte{}
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}
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case data := <-dataChan:
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buf = append(buf, data...)
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}
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}
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log.Debugf("[%v:%v] Guacd连接已关闭，退出定时器循环。", sessionId, connectionId)
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}()
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for {
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_, message, err := ws.ReadMessage()
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if err != nil {
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log.Debugf("[%v:%v] WebSocket已关闭", sessionId, connectionId)
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// guacdTunnel.Read() 会阻塞，所以要先把guacdTunnel客户端关闭，才能退出Guacd循环
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_ = guacdTunnel.Close()
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if connectionId != "" {
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observerId := nextSession.ID
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forObsSession := session.GlobalSessionManager.GetById(sessionId)
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if forObsSession != nil {
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// 移除会话中保存的观察者信息
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forObsSession.Observer.Del <- observerId
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log.Debugf("[%v:%v] 观察者[%v]退出会话", sessionId, connectionId, observerId)
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}
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} else {
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CloseSessionById(sessionId, Normal, "用户正常退出")
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}
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cancel()
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break
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}
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_, err = guacdTunnel.WriteAndFlush(message)
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if err != nil {
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CloseSessionById(sessionId, TunnelClosed, "远程连接已关闭")
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}
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}
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return nil
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}
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func setAssetConfig(attributes map[string]string, s model.Session, configuration *guacd.Configuration) {
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for key, value := range attributes {
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if guacd.DrivePath == key {
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// 忽略该参数
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continue
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}
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if guacd.EnableDrive == key && value == "true" {
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storageId := attributes[guacd.DrivePath]
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if storageId == "" || storageId == "-" {
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// 默认空间ID和用户ID相同
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storageId = s.Creator
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}
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realPath := path.Join(storageService.GetBaseDrivePath(), storageId)
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configuration.SetParameter(guacd.EnableDrive, "true")
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configuration.SetParameter(guacd.DriveName, "Next Terminal Filesystem")
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configuration.SetParameter(guacd.DrivePath, realPath)
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log.Debugf("[%v] 会话 %v:%v 映射目录地址为 %v", s.ID, s.IP, s.Port, realPath)
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} else {
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configuration.SetParameter(key, value)
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}
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}
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}
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func setConfig(propertyMap map[string]string, s model.Session, configuration *guacd.Configuration) {
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if propertyMap[guacd.EnableRecording] == "true" {
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configuration.SetParameter(guacd.RecordingPath, path.Join(config.GlobalCfg.Guacd.Recording, s.ID))
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configuration.SetParameter(guacd.CreateRecordingPath, propertyMap[guacd.CreateRecordingPath])
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} else {
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configuration.SetParameter(guacd.RecordingPath, "")
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}
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configuration.Protocol = s.Protocol
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switch configuration.Protocol {
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case "rdp":
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configuration.SetParameter("username", s.Username)
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configuration.SetParameter("password", s.Password)
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configuration.SetParameter("security", "any")
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configuration.SetParameter("ignore-cert", "true")
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configuration.SetParameter("create-drive-path", "true")
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configuration.SetParameter("resize-method", "reconnect")
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configuration.SetParameter(guacd.EnableWallpaper, propertyMap[guacd.EnableWallpaper])
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configuration.SetParameter(guacd.EnableTheming, propertyMap[guacd.EnableTheming])
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configuration.SetParameter(guacd.EnableFontSmoothing, propertyMap[guacd.EnableFontSmoothing])
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configuration.SetParameter(guacd.EnableFullWindowDrag, propertyMap[guacd.EnableFullWindowDrag])
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configuration.SetParameter(guacd.EnableDesktopComposition, propertyMap[guacd.EnableDesktopComposition])
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configuration.SetParameter(guacd.EnableMenuAnimations, propertyMap[guacd.EnableMenuAnimations])
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configuration.SetParameter(guacd.DisableBitmapCaching, propertyMap[guacd.DisableBitmapCaching])
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configuration.SetParameter(guacd.DisableOffscreenCaching, propertyMap[guacd.DisableOffscreenCaching])
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configuration.SetParameter(guacd.DisableGlyphCaching, propertyMap[guacd.DisableGlyphCaching])
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case "ssh":
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if len(s.PrivateKey) > 0 && s.PrivateKey != "-" {
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configuration.SetParameter("username", s.Username)
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configuration.SetParameter("private-key", s.PrivateKey)
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configuration.SetParameter("passphrase", s.Passphrase)
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} else {
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configuration.SetParameter("username", s.Username)
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configuration.SetParameter("password", s.Password)
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}
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configuration.SetParameter(guacd.FontSize, propertyMap[guacd.FontSize])
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configuration.SetParameter(guacd.FontName, propertyMap[guacd.FontName])
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configuration.SetParameter(guacd.ColorScheme, propertyMap[guacd.ColorScheme])
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configuration.SetParameter(guacd.Backspace, propertyMap[guacd.Backspace])
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configuration.SetParameter(guacd.TerminalType, propertyMap[guacd.TerminalType])
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case "vnc":
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configuration.SetParameter("username", s.Username)
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configuration.SetParameter("password", s.Password)
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case "telnet":
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configuration.SetParameter("username", s.Username)
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configuration.SetParameter("password", s.Password)
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configuration.SetParameter(guacd.FontSize, propertyMap[guacd.FontSize])
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configuration.SetParameter(guacd.FontName, propertyMap[guacd.FontName])
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configuration.SetParameter(guacd.ColorScheme, propertyMap[guacd.ColorScheme])
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configuration.SetParameter(guacd.Backspace, propertyMap[guacd.Backspace])
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configuration.SetParameter(guacd.TerminalType, propertyMap[guacd.TerminalType])
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case "kubernetes":
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configuration.SetParameter(guacd.FontSize, propertyMap[guacd.FontSize])
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configuration.SetParameter(guacd.FontName, propertyMap[guacd.FontName])
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configuration.SetParameter(guacd.ColorScheme, propertyMap[guacd.ColorScheme])
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configuration.SetParameter(guacd.Backspace, propertyMap[guacd.Backspace])
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configuration.SetParameter(guacd.TerminalType, propertyMap[guacd.TerminalType])
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default:
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}
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}
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func disconnect(ws *websocket.Conn, code int, reason string) {
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// guacd 无法处理中文字符，所以进行了base64编码。
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encodeReason := base64.StdEncoding.EncodeToString([]byte(reason))
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err := guacd.NewInstruction("error", encodeReason, strconv.Itoa(code))
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_ = ws.WriteMessage(websocket.TextMessage, []byte(err.String()))
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disconnect := guacd.NewInstruction("disconnect")
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_ = ws.WriteMessage(websocket.TextMessage, []byte(disconnect.String()))
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}
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