469 lines
12 KiB
Go
469 lines
12 KiB
Go
package api
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import (
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"encoding/hex"
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"errors"
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"fmt"
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"io"
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"path"
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"strings"
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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/cache"
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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/term"
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"next-terminal/server/totp"
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"next-terminal/server/utils"
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"github.com/gliderlabs/ssh"
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"github.com/manifoldco/promptui"
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"gorm.io/gorm"
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)
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func sessionHandler(sess *ssh.Session) {
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defer func() {
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_ = (*sess).Close()
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}()
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username := (*sess).User()
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remoteAddr := strings.Split((*sess).RemoteAddr().String(), ":")[0]
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user, err := userRepository.FindByUsername(username)
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if err != nil {
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if errors.Is(err, gorm.ErrRecordNotFound) {
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_, _ = io.WriteString(*sess, "您输入的账户或密码不正确.\n")
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} else {
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_, _ = io.WriteString(*sess, err.Error())
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}
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return
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}
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// 判断是否需要进行双因素认证
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if user.TOTPSecret != "" && user.TOTPSecret != "-" {
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totpUI(sess, user, remoteAddr, username)
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} else {
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// 保存登录日志
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_ = SaveLoginLog(remoteAddr, "terminal", username, true, false, utils.UUID(), "")
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mainUI(sess, user)
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}
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}
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func totpUI(sess *ssh.Session, user model.User, remoteAddr string, username string) {
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validate := func(input string) error {
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if len(input) < 6 {
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return errors.New("双因素认证授权码必须为6个数字")
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}
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return nil
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}
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prompt := promptui.Prompt{
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Label: "请输入双因素认证授权码",
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Validate: validate,
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Mask: '*',
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Stdin: *sess,
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Stdout: *sess,
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}
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var success = false
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for i := 0; i < 5; i++ {
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result, err := prompt.Run()
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if err != nil {
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fmt.Printf("Prompt failed %v\n", err)
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return
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}
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loginFailCountKey := remoteAddr + username
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v, ok := cache.GlobalCache.Get(loginFailCountKey)
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if !ok {
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v = 1
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}
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count := v.(int)
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if count >= 5 {
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_, _ = io.WriteString(*sess, "登录失败次数过多，请等待30秒后再试\r\n")
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continue
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}
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if !totp.Validate(result, user.TOTPSecret) {
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count++
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println(count)
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cache.GlobalCache.Set(loginFailCountKey, count, time.Second*time.Duration(30))
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// 保存登录日志
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_ = SaveLoginLog(remoteAddr, "terminal", username, false, false, "", "双因素认证授权码不正确")
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_, _ = io.WriteString(*sess, "您输入的双因素认证授权码不匹配\r\n")
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continue
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}
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success = true
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break
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}
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if success {
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// 保存登录日志
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_ = SaveLoginLog(remoteAddr, "terminal", username, true, false, utils.UUID(), "")
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mainUI(sess, user)
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}
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}
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func mainUI(sess *ssh.Session, user model.User) {
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prompt := promptui.Select{
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Label: "欢迎使用 Next Terminal，请选择您要使用的功能",
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Items: []string{"我的资产", "退出系统"},
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Stdin: *sess,
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Stdout: *sess,
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}
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MainLoop:
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for {
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_, result, err := prompt.Run()
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if err != nil {
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fmt.Printf("Prompt failed %v\n", err)
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return
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}
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switch result {
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case "我的资产":
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AssetUI(sess, user)
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case "退出系统":
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break MainLoop
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}
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}
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}
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func AssetUI(sess *ssh.Session, user model.User) {
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assets, err := assetRepository.FindByProtocolAndUser(constant.SSH, user)
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if err != nil {
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return
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}
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quitItem := model.Asset{ID: "quit", Name: "返回上级菜单", Description: "这里是返回上级菜单的选项"}
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assets = append([]model.Asset{quitItem}, assets...)
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templates := &promptui.SelectTemplates{
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Label: "{{ . }}?",
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Active: "\U0001F336 {{ .Name | cyan }} ({{ .IP | red }}:{{ .Port | red }})",
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Inactive: " {{ .Name | cyan }} ({{ .IP | red }}:{{ .Port | red }})",
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Selected: "\U0001F336 {{ .Name | red | cyan }}",
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Details: `
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--------- 详细信息 ----------
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{{ "名称:" | faint }} {{ .Name }}
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{{ "主机:" | faint }} {{ .IP }}
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{{ "端口:" | faint }} {{ .Port }}
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{{ "标签:" | faint }} {{ .Tags }}
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{{ "备注:" | faint }} {{ .Description }}
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`,
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}
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searcher := func(input string, index int) bool {
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asset := assets[index]
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name := strings.Replace(strings.ToLower(asset.Name), " ", "", -1)
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input = strings.Replace(strings.ToLower(input), " ", "", -1)
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return strings.Contains(name, input)
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}
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prompt := promptui.Select{
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Label: "请选择您要访问的资产",
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Items: assets,
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Templates: templates,
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Size: 4,
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Searcher: searcher,
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Stdin: *sess,
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Stdout: *sess,
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}
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AssetUILoop:
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for {
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i, _, err := prompt.Run()
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if err != nil {
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fmt.Printf("Prompt failed %v\n", err)
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return
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}
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chooseAssetId := assets[i].ID
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switch chooseAssetId {
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case "quit":
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break AssetUILoop
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default:
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if err := createSession(sess, assets[i].ID, user.ID); err != nil {
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_, _ = io.WriteString(*sess, err.Error()+"\r\n")
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return
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}
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}
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}
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}
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func createSession(sess *ssh.Session, assetId, creator string) (err error) {
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asset, err := assetRepository.FindById(assetId)
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if err != nil {
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return err
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}
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ClientIP := strings.Split((*sess).RemoteAddr().String(), ":")[0]
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s := &model.Session{
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ID: utils.UUID(),
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AssetId: asset.ID,
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Username: asset.Username,
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Password: asset.Password,
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PrivateKey: asset.PrivateKey,
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Passphrase: asset.Passphrase,
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Protocol: asset.Protocol,
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IP: asset.IP,
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Port: asset.Port,
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Status: constant.NoConnect,
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Creator: creator,
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ClientIP: ClientIP,
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Mode: constant.Terminal,
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Upload: "0",
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Download: "0",
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Delete: "0",
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Rename: "0",
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StorageId: "",
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AccessGatewayId: asset.AccessGatewayId,
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}
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if asset.AccountType == "credential" {
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credential, err := credentialRepository.FindById(asset.CredentialId)
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if err != nil {
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return nil
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}
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if credential.Type == constant.Custom {
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s.Username = credential.Username
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s.Password = credential.Password
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} else {
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s.Username = credential.Username
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s.PrivateKey = credential.PrivateKey
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s.Passphrase = credential.Passphrase
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}
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}
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if err := sessionRepository.Create(s); err != nil {
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return err
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}
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return handleAccessAsset(sess, s.ID)
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}
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func handleAccessAsset(sess *ssh.Session, sessionId string) (err error) {
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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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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 := accessGatewayService.GetGatewayAndReconnectById(s.AccessGatewayId)
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if err != nil {
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return errors.New("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 errors.New("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 errors.New("开启SSH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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pty, winCh, isPty := (*sess).Pty()
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if !isPty {
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return errors.New("No PTY requested.\n")
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}
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recording := ""
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property, err := propertyRepository.FindByName(guacd.EnableRecording)
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if err == nil && property.Value == "true" {
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recording = path.Join(config.GlobalCfg.Guacd.Recording, sessionId, "recording.cast")
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}
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nextTerminal, err := term.NewNextTerminal(ip, port, username, password, privateKey, passphrase, pty.Window.Height, pty.Window.Width, recording, pty.Term, false)
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if err != nil {
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return err
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}
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sshSession := nextTerminal.SshSession
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writer := NewWriter(sessionId, sess, nextTerminal.Recorder)
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sshSession.Stdout = writer
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sshSession.Stdin = *sess
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sshSession.Stderr = *sess
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if err := nextTerminal.RequestPty(pty.Term, pty.Window.Height, pty.Window.Width); 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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go func() {
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log.Debugf("开启窗口大小监控...")
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for win := range winCh {
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_ = sshSession.WindowChange(win.Height, win.Width)
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}
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log.Debugf("退出窗口大小监控")
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// ==== 修改数据库中的会话状态为已断开,修复用户直接关闭窗口时会话状态不正确的问题 ====
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CloseSessionById(sessionId, Normal, "用户正常退出")
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// ==== 修改数据库中的会话状态为已断开,修复用户直接关闭窗口时会话状态不正确的问题 ====
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}()
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// ==== 修改数据库中的会话状态为已连接 ====
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sessionForUpdate := model.Session{}
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sessionForUpdate.ID = sessionId
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sessionForUpdate.Status = constant.Connected
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sessionForUpdate.Recording = recording
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sessionForUpdate.ConnectedTime = utils.NowJsonTime()
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if err := sessionRepository.UpdateById(&sessionForUpdate, sessionId); err != nil {
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return err
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}
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// ==== 修改数据库中的会话状态为已连接 ====
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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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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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if err := sshSession.Wait(); err != nil {
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return err
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}
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// ==== 修改数据库中的会话状态为已断开 ====
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CloseSessionById(sessionId, Normal, "用户正常退出")
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// ==== 修改数据库中的会话状态为已断开 ====
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return nil
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}
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func passwordAuth(ctx ssh.Context, pass string) bool {
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username := ctx.User()
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remoteAddr := strings.Split(ctx.RemoteAddr().String(), ":")[0]
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user, err := userRepository.FindByUsername(username)
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if err != nil {
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// 保存登录日志
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_ = SaveLoginLog(remoteAddr, "terminal", username, false, false, "", "账号或密码不正确")
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return false
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}
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if err := utils.Encoder.Match([]byte(user.Password), []byte(pass)); err != nil {
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// 保存登录日志
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_ = SaveLoginLog(remoteAddr, "terminal", username, false, false, "", "账号或密码不正确")
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return false
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}
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return true
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}
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func Setup() {
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ssh.Handle(func(s ssh.Session) {
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_, _ = io.WriteString(s, fmt.Sprintf(constant.Banner, constant.Version))
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defer func() {
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if e, ok := recover().(error); ok {
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log.Fatal(e)
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}
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}()
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sessionHandler(&s)
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})
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fmt.Printf("⇨ sshd server started on %v\n", config.GlobalCfg.Sshd.Addr)
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err := ssh.ListenAndServe(
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config.GlobalCfg.Sshd.Addr,
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nil,
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ssh.PasswordAuth(passwordAuth),
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ssh.HostKeyFile(config.GlobalCfg.Sshd.Key),
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)
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log.Fatal(fmt.Sprintf("启动sshd服务失败: %v", err.Error()))
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}
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func init() {
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if config.GlobalCfg.Sshd.Enable {
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go Setup()
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}
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}
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type Writer struct {
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sessionId string
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sess *ssh.Session
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recorder *term.Recorder
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rz bool
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sz bool
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}
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func NewWriter(sessionId string, sess *ssh.Session, recorder *term.Recorder) *Writer {
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return &Writer{sessionId: sessionId, sess: sess, recorder: recorder}
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}
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func (w *Writer) Write(p []byte) (n int, err error) {
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if w.recorder != nil {
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s := string(p)
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if !w.sz && !w.rz {
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// rz的开头字符
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hexData := hex.EncodeToString(p)
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if strings.Contains(hexData, "727a0d2a2a184230303030303030303030303030300d8a11") {
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w.sz = true
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} else if strings.Contains(hexData, "727a2077616974696e6720746f20726563656976652e2a2a184230313030303030303233626535300d8a11") {
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w.rz = true
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}
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}
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if w.sz {
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// sz 会以 OO 结尾
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if "OO" == s {
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w.sz = false
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}
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} else if w.rz {
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// rz 最后会显示 Received /home/xxx
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if strings.Contains(s, "Received") {
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w.rz = false
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// 把上传的文件名称也显示一下
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err := w.recorder.WriteData(s)
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if err != nil {
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return 0, err
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}
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sendObData(w.sessionId, s)
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}
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} else {
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err := w.recorder.WriteData(s)
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if err != nil {
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return 0, err
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}
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sendObData(w.sessionId, s)
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}
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}
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return (*w.sess).Write(p)
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}
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func sendObData(sessionId, s string) {
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nextSession := session.GlobalSessionManager.GetById(sessionId)
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if nextSession != nil {
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if nextSession.Observer != nil {
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obs := nextSession.Observer.All()
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for _, ob := range obs {
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_ = WriteMessage(ob.WebSocket, NewMessage(Data, s))
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}
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}
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}
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}
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