289 lines
7.9 KiB
Go
289 lines
7.9 KiB
Go
package api
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import (
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"context"
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"encoding/base64"
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"encoding/json"
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"errors"
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"path"
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"strconv"
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"next-terminal/server/config"
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"next-terminal/server/constant"
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"next-terminal/server/dto"
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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/repository"
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"next-terminal/server/service"
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"next-terminal/server/term"
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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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Closed = 0
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Connected = 1
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Data = 2
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Resize = 3
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Ping = 4
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)
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type WebTerminalApi struct {
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}
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func (api WebTerminalApi) SshEndpoint(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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defer func() {
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_ = ws.Close()
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}()
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ctx := context.TODO()
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sessionId := c.QueryParam("sessionId")
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cols, _ := strconv.Atoi(c.QueryParam("cols"))
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rows, _ := strconv.Atoi(c.QueryParam("rows"))
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s, err := service.SessionService.FindByIdAndDecrypt(ctx, sessionId)
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if err != nil {
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return WriteMessage(ws, dto.NewMessage(Closed, "获取会话失败"))
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}
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if err := api.permissionCheck(c, s.AssetId); err != nil {
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return WriteMessage(ws, dto.NewMessage(Closed, err.Error()))
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}
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var (
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username = s.Username
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password = s.Password
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privateKey = s.PrivateKey
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passphrase = s.Passphrase
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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 := service.GatewayService.GetGatewayAndReconnectById(s.AccessGatewayId)
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if err != nil {
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return WriteMessage(ws, dto.NewMessage(Closed, "获取接入网关失败："+err.Error()))
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}
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if !g.Connected {
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return WriteMessage(ws, dto.NewMessage(Closed, "接入网关不可用："+g.Message))
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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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return WriteMessage(ws, dto.NewMessage(Closed, "创建隧道失败："+err.Error()))
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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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recording := ""
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var isRecording = false
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property, err := repository.PropertyRepository.FindByName(ctx, guacd.EnableRecording)
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if err == nil && property.Value == "true" {
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isRecording = true
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}
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if isRecording {
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recording = path.Join(config.GlobalCfg.Guacd.Recording, sessionId, "recording.cast")
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}
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attributes, err := repository.AssetRepository.FindAssetAttrMapByAssetId(ctx, s.AssetId)
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if err != nil {
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return WriteMessage(ws, dto.NewMessage(Closed, "获取资产属性失败："+err.Error()))
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}
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var xterm = "xterm-256color"
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var nextTerminal *term.NextTerminal
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if "true" == attributes[constant.SocksProxyEnable] {
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nextTerminal, err = term.NewNextTerminalUseSocks(ip, port, username, password, privateKey, passphrase, rows, cols, recording, xterm, true, attributes[constant.SocksProxyHost], attributes[constant.SocksProxyPort], attributes[constant.SocksProxyUsername], attributes[constant.SocksProxyPassword])
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} else {
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nextTerminal, err = term.NewNextTerminal(ip, port, username, password, privateKey, passphrase, rows, cols, recording, xterm, true)
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}
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if err != nil {
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return WriteMessage(ws, dto.NewMessage(Closed, "创建SSH客户端失败："+err.Error()))
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}
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if err := nextTerminal.RequestPty(xterm, rows, cols); err != nil {
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return err
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}
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if err := nextTerminal.Shell(); err != nil {
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return err
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}
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sess := model.Session{
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ConnectionId: sessionId,
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Width: cols,
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Height: rows,
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Status: constant.Connecting,
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Recording: recording,
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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("创建新会话 %v", sess.ConnectionId)
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if err := repository.SessionRepository.UpdateById(ctx, &sess, sessionId); err != nil {
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return err
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}
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if err := WriteMessage(ws, dto.NewMessage(Connected, "")); err != nil {
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return err
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}
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nextSession := &session.Session{
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ID: s.ID,
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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: nil,
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NextTerminal: nextTerminal,
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Observer: session.NewObserver(s.ID),
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}
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go nextSession.Observer.Run()
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session.GlobalSessionManager.Add <- nextSession
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termHandler := NewTermHandler(sessionId, isRecording, ws, nextTerminal)
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termHandler.Start()
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for {
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_, message, err := ws.ReadMessage()
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if err != nil {
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// web socket会话关闭后主动关闭ssh会话
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log.Debugf("WebSocket已关闭")
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service.SessionService.CloseSessionById(sessionId, Normal, "用户正常退出")
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termHandler.Stop()
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break
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}
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msg, err := dto.ParseMessage(string(message))
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if err != nil {
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log.Warnf("消息解码失败: %v, 原始字符串：%v", err, string(message))
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continue
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}
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switch msg.Type {
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case Resize:
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decodeString, err := base64.StdEncoding.DecodeString(msg.Content)
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if err != nil {
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log.Warnf("Base64解码失败: %v，原始字符串：%v", err, msg.Content)
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continue
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}
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var winSize dto.WindowSize
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err = json.Unmarshal(decodeString, &winSize)
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if err != nil {
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log.Warnf("解析SSH会话窗口大小失败: %v，原始字符串：%v", err, msg.Content)
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continue
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}
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if err := nextTerminal.WindowChange(winSize.Rows, winSize.Cols); err != nil {
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log.Warnf("更改SSH会话窗口大小失败: %v", err)
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}
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_ = repository.SessionRepository.UpdateWindowSizeById(ctx, winSize.Rows, winSize.Cols, sessionId)
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case Data:
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input := []byte(msg.Content)
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_, err := nextTerminal.Write(input)
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if err != nil {
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service.SessionService.CloseSessionById(sessionId, TunnelClosed, "远程连接已关闭")
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}
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case Ping:
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_, _, err := nextTerminal.SshClient.Conn.SendRequest("helloworld1024@foxmail.com", true, nil)
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if err != nil {
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service.SessionService.CloseSessionById(sessionId, TunnelClosed, "远程连接已关闭")
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} else {
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_ = WriteMessage(ws, dto.NewMessage(Ping, ""))
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}
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}
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}
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return err
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}
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func (api WebTerminalApi) SshMonitorEndpoint(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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defer func() {
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_ = ws.Close()
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}()
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ctx := context.TODO()
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sessionId := c.QueryParam("sessionId")
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s, err := repository.SessionRepository.FindById(ctx, sessionId)
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if err != nil {
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return WriteMessage(ws, dto.NewMessage(Closed, "获取会话失败"))
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}
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nextSession := session.GlobalSessionManager.GetById(sessionId)
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if nextSession == nil {
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return WriteMessage(ws, dto.NewMessage(Closed, "会话已离线"))
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}
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obId := utils.UUID()
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obSession := &session.Session{
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ID: obId,
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Protocol: s.Protocol,
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Mode: s.Mode,
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WebSocket: ws,
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}
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nextSession.Observer.Add <- obSession
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log.Debugf("会话 %v 观察者 %v 进入", sessionId, obId)
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for {
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_, _, err := ws.ReadMessage()
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if err != nil {
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log.Debugf("会话 %v 观察者 %v 退出", sessionId, obId)
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nextSession.Observer.Del <- obId
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break
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}
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}
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return nil
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}
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func (api WebTerminalApi) permissionCheck(c echo.Context, assetId string) error {
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user, _ := GetCurrentAccount(c)
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if constant.TypeUser == user.Type {
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// 检测是否有访问权限
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assetIds, err := repository.ResourceSharerRepository.FindAssetIdsByUserId(context.TODO(), user.ID)
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if err != nil {
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return err
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}
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if !utils.Contains(assetIds, assetId) {
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return errors.New("您没有权限访问此资产")
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}
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}
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return nil
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}
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func WriteMessage(ws *websocket.Conn, msg dto.Message) error {
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message := []byte(msg.ToString())
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return ws.WriteMessage(websocket.TextMessage, message)
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}
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func CreateNextTerminalBySession(session model.Session) (*term.NextTerminal, error) {
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var (
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username = session.Username
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password = session.Password
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privateKey = session.PrivateKey
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passphrase = session.Passphrase
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ip = session.IP
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port = session.Port
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)
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return term.NewNextTerminal(ip, port, username, password, privateKey, passphrase, 10, 10, "", "", false)
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}
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