523 lines
15 KiB
Go
523 lines
15 KiB
Go
package tunnel
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import (
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"crypto/rand"
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"encoding/json"
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"fmt"
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"io/ioutil"
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"os"
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"path/filepath"
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"regexp"
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"sort"
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"strings"
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"text/tabwriter"
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"time"
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"github.com/google/uuid"
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"github.com/mitchellh/go-homedir"
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"github.com/pkg/errors"
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"github.com/urfave/cli/v2"
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"golang.org/x/net/idna"
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"gopkg.in/yaml.v2"
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"github.com/cloudflare/cloudflared/cmd/cloudflared/cliutil"
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"github.com/cloudflare/cloudflared/logger"
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"github.com/cloudflare/cloudflared/tunnelrpc/pogs"
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"github.com/cloudflare/cloudflared/tunnelstore"
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)
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const (
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credFileFlagAlias = "cred-file"
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)
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var (
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showDeletedFlag = &cli.BoolFlag{
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Name: "show-deleted",
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Aliases: []string{"d"},
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Usage: "Include deleted tunnels in the list",
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}
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listNameFlag = &cli.StringFlag{
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Name: "name",
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Aliases: []string{"n"},
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Usage: "List tunnels with the given `NAME`",
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}
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listExistedAtFlag = &cli.TimestampFlag{
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Name: "when",
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Aliases: []string{"w"},
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Usage: "List tunnels that are active at the given `TIME` in RFC3339 format",
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Layout: tunnelstore.TimeLayout,
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DefaultText: fmt.Sprintf("current time, %s", time.Now().Format(tunnelstore.TimeLayout)),
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}
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listIDFlag = &cli.StringFlag{
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Name: "id",
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Aliases: []string{"i"},
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Usage: "List tunnel by `ID`",
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}
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showRecentlyDisconnected = &cli.BoolFlag{
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Name: "show-recently-disconnected",
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Aliases: []string{"rd"},
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Usage: "Include connections that have recently disconnected in the list",
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}
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outputFormatFlag = &cli.StringFlag{
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Name: "output",
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Aliases: []string{"o"},
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Usage: "Render output using given `FORMAT`. Valid options are 'json' or 'yaml'",
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}
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forceFlag = &cli.BoolFlag{
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Name: "force",
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Aliases: []string{"f"},
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Usage: "By default, if a tunnel is currently being run from a cloudflared, you can't " +
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"simultaneously rerun it again from a second cloudflared. The --force flag lets you " +
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"overwrite the previous tunnel. If you want to use a single hostname with multiple " +
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"tunnels, you can do so with Cloudflare's Load Balancer product.",
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}
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credentialsFileFlag = &cli.StringFlag{
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Name: "credentials-file",
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Aliases: []string{credFileFlagAlias},
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Usage: "File path of tunnel credentials",
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}
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forceDeleteFlag = &cli.BoolFlag{
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Name: "force",
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Aliases: []string{"f"},
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Usage: "Allows you to delete a tunnel, even if it has active connections.",
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}
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)
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func buildCreateCommand() *cli.Command {
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return &cli.Command{
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Name: "create",
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Action: cliutil.ErrorHandler(createCommand),
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Usage: "Create a new tunnel with given name",
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UsageText: "cloudflared tunnel [tunnel command options] create [create command options]",
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Description: "cloudflared tunnel create example will create a tunnel named example, and generate a credential file to run the tunnel",
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ArgsUsage: "TUNNEL-NAME",
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Flags: []cli.Flag{outputFormatFlag},
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CustomHelpTemplate: commandHelpTemplate(),
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}
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}
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// generateTunnelSecret as an array of 32 bytes using secure random number generator
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func generateTunnelSecret() ([]byte, error) {
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randomBytes := make([]byte, 32)
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_, err := rand.Read(randomBytes)
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return randomBytes, err
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}
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func createCommand(c *cli.Context) error {
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sc, err := newSubcommandContext(c)
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if err != nil {
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return errors.Wrap(err, "error setting up logger")
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}
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if c.NArg() != 1 {
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return cliutil.UsageError(`"cloudflared tunnel create" requires exactly 1 argument, the name of tunnel to create.`)
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}
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name := c.Args().First()
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_, err = sc.create(name)
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return errors.Wrap(err, "failed to create tunnel")
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}
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func tunnelFilePath(tunnelID uuid.UUID, directory string) (string, error) {
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fileName := fmt.Sprintf("%v.json", tunnelID)
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filePath := filepath.Clean(fmt.Sprintf("%s/%s", directory, fileName))
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return homedir.Expand(filePath)
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}
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func writeTunnelCredentials(tunnelID uuid.UUID, accountID, originCertPath string, tunnelSecret []byte, logger logger.Service) error {
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originCertDir := filepath.Dir(originCertPath)
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filePath, err := tunnelFilePath(tunnelID, originCertDir)
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if err != nil {
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return err
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}
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body, err := json.Marshal(pogs.TunnelAuth{
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AccountTag: accountID,
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TunnelSecret: tunnelSecret,
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})
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if err != nil {
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return errors.Wrap(err, "Unable to marshal tunnel credentials to JSON")
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}
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logger.Infof("Writing tunnel credentials to %v. cloudflared chose this file based on where your origin certificate was found.", filePath)
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logger.Infof("Keep this file secret. To revoke these credentials, delete the tunnel.")
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return ioutil.WriteFile(filePath, body, 400)
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}
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func validFilePath(path string) bool {
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fileStat, err := os.Stat(path)
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if err != nil {
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return false
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}
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return !fileStat.IsDir()
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}
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func buildListCommand() *cli.Command {
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return &cli.Command{
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Name: "list",
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Action: cliutil.ErrorHandler(listCommand),
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Usage: "List existing tunnels",
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UsageText: "cloudflared tunnel [tunnel command options] list [subcommand options]",
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Description: "cloudflared tunnel list will return all active tunnels, their created time and associated connections. Use -d flag to include deleted tunnels. See the list of options to filter the list",
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ArgsUsage: " ",
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Flags: []cli.Flag{outputFormatFlag, showDeletedFlag, listNameFlag, listExistedAtFlag, listIDFlag, showRecentlyDisconnected},
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CustomHelpTemplate: commandHelpTemplate(),
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}
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}
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func listCommand(c *cli.Context) error {
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sc, err := newSubcommandContext(c)
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if err != nil {
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return err
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}
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filter := tunnelstore.NewFilter()
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if !c.Bool("show-deleted") {
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filter.NoDeleted()
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}
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if name := c.String("name"); name != "" {
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filter.ByName(name)
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}
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if existedAt := c.Timestamp("time"); existedAt != nil {
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filter.ByExistedAt(*existedAt)
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}
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if id := c.String("id"); id != "" {
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tunnelID, err := uuid.Parse(id)
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if err != nil {
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return errors.Wrapf(err, "%s is not a valid tunnel ID", id)
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}
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filter.ByTunnelID(tunnelID)
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}
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tunnels, err := sc.list(filter)
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if err != nil {
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return err
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}
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if outputFormat := c.String(outputFormatFlag.Name); outputFormat != "" {
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return renderOutput(outputFormat, tunnels)
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}
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if len(tunnels) > 0 {
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fmtAndPrintTunnelList(tunnels, c.Bool("show-recently-disconnected"))
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} else {
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fmt.Println("You have no tunnels, use 'cloudflared tunnel create' to define a new tunnel")
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}
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return nil
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}
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func fmtAndPrintTunnelList(tunnels []*tunnelstore.Tunnel, showRecentlyDisconnected bool) {
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const (
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minWidth = 0
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tabWidth = 8
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padding = 1
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padChar = ' '
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flags = 0
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)
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writer := tabwriter.NewWriter(os.Stdout, minWidth, tabWidth, padding, padChar, flags)
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defer writer.Flush()
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// Print column headers with tabbed columns
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fmt.Fprintln(writer, "ID\tNAME\tCREATED\tCONNECTIONS\t")
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// Loop through tunnels, create formatted string for each, and print using tabwriter
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for _, t := range tunnels {
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formattedStr := fmt.Sprintf(
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"%s\t%s\t%s\t%s\t",
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t.ID,
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t.Name,
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t.CreatedAt.Format(time.RFC3339),
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fmtConnections(t.Connections, showRecentlyDisconnected),
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)
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fmt.Fprintln(writer, formattedStr)
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}
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}
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func fmtConnections(connections []tunnelstore.Connection, showRecentlyDisconnected bool) string {
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// Count connections per colo
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numConnsPerColo := make(map[string]uint, len(connections))
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for _, connection := range connections {
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if !connection.IsPendingReconnect || showRecentlyDisconnected {
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numConnsPerColo[connection.ColoName]++
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}
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}
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// Get sorted list of colos
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sortedColos := []string{}
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for coloName := range numConnsPerColo {
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sortedColos = append(sortedColos, coloName)
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}
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sort.Strings(sortedColos)
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// Map each colo to its frequency, combine into output string.
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var output []string
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for _, coloName := range sortedColos {
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output = append(output, fmt.Sprintf("%dx%s", numConnsPerColo[coloName], coloName))
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}
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return strings.Join(output, ", ")
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}
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func buildDeleteCommand() *cli.Command {
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return &cli.Command{
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Name: "delete",
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Action: cliutil.ErrorHandler(deleteCommand),
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Usage: "Delete existing tunnel by UUID or name",
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UsageText: "cloudflared tunnel [tunnel command options] delete [subcommand options]",
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Description: "cloudflared tunnel delete will delete tunnels with the given tunnel UUIDs or names. A tunnel cannot be deleted if it has active connections. To delete the tunnel unconditionally, use -f flag.",
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ArgsUsage: "TUNNEL",
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Flags: []cli.Flag{credentialsFileFlag, forceDeleteFlag},
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CustomHelpTemplate: commandHelpTemplate(),
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}
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}
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func deleteCommand(c *cli.Context) error {
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sc, err := newSubcommandContext(c)
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if err != nil {
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return err
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}
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if c.NArg() < 1 {
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return cliutil.UsageError(`"cloudflared tunnel delete" requires at least 1 argument, the ID or name of the tunnel to delete.`)
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}
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tunnelIDs, err := sc.findIDs(c.Args().Slice())
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if err != nil {
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return err
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}
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return sc.delete(tunnelIDs)
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}
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func renderOutput(format string, v interface{}) error {
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switch format {
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case "json":
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encoder := json.NewEncoder(os.Stdout)
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encoder.SetIndent("", " ")
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return encoder.Encode(v)
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case "yaml":
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return yaml.NewEncoder(os.Stdout).Encode(v)
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default:
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return errors.Errorf("Unknown output format '%s'", format)
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}
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}
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func buildRunCommand() *cli.Command {
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flags := []cli.Flag{
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forceFlag,
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credentialsFileFlag,
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}
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flags = append(flags, configureProxyFlags(false)...)
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return &cli.Command{
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Name: "run",
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Action: cliutil.ErrorHandler(runCommand),
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Usage: "Proxy a local web server by running the given tunnel",
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UsageText: "cloudflared tunnel [tunnel command options] run [subcommand options]",
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ArgsUsage: "TUNNEL",
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Description: `Runs the tunnel identified by name or UUUD, creating highly available connections
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between your server and the Cloudflare edge.
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This command requires the tunnel credentials file created when "cloudflared tunnel create" was run,
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however it does not need access to cert.pem from "cloudflared login" if you identify the tunnel by UUID.
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If you experience other problems running gitthe tunnel, "cloudflared tunnel cleanup" may help by removing any old connection records.
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`,
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Flags: flags,
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CustomHelpTemplate: commandHelpTemplate(),
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}
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}
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func runCommand(c *cli.Context) error {
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sc, err := newSubcommandContext(c)
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if err != nil {
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return err
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}
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if c.NArg() != 1 {
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return cliutil.UsageError(`"cloudflared tunnel run" requires exactly 1 argument, the ID or name of the tunnel to run.`)
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}
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tunnelID, err := sc.findID(c.Args().First())
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if err != nil {
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return errors.Wrap(err, "error parsing tunnel ID")
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}
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return sc.run(tunnelID)
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}
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func buildCleanupCommand() *cli.Command {
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return &cli.Command{
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Name: "cleanup",
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Action: cliutil.ErrorHandler(cleanupCommand),
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Usage: "Cleanup tunnel connections",
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UsageText: "cloudflared tunnel [tunnel command options] cleanup [subcommand options]",
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Description: "Delete connections for tunnels with the given UUIDs or names.",
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ArgsUsage: "TUNNEL",
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CustomHelpTemplate: commandHelpTemplate(),
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}
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}
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func cleanupCommand(c *cli.Context) error {
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if c.NArg() < 1 {
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return cliutil.UsageError(`"cloudflared tunnel cleanup" requires at least 1 argument, the IDs of the tunnels to cleanup connections.`)
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}
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sc, err := newSubcommandContext(c)
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if err != nil {
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return err
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}
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tunnelIDs, err := sc.findIDs(c.Args().Slice())
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if err != nil {
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return err
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}
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return sc.cleanupConnections(tunnelIDs)
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}
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func buildRouteCommand() *cli.Command {
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return &cli.Command{
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Name: "route",
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Action: cliutil.ErrorHandler(routeCommand),
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Usage: "Define what hostname or load balancer can route to this tunnel",
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UsageText: "cloudflared tunnel [tunnel command options] route [subcommand options]",
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Description: `The route defines what hostname or load balancer will proxy requests to this tunnel.
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To route a hostname by creating a CNAME to tunnel's address:
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cloudflared tunnel route dns <tunnel ID> <hostname>
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To use this tunnel as a load balancer origin, creating pool and load balancer if necessary:
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cloudflared tunnel route lb <tunnel ID> <load balancer name> <load balancer pool>`,
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ArgsUsage: "dns|lb TUNNEL HOSTNAME [LB-POOL]",
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CustomHelpTemplate: commandHelpTemplate(),
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}
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}
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func dnsRouteFromArg(c *cli.Context) (tunnelstore.Route, error) {
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const (
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userHostnameIndex = 2
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expectedNArgs = 3
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)
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if c.NArg() != expectedNArgs {
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return nil, cliutil.UsageError("Expected %d arguments, got %d", expectedNArgs, c.NArg())
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}
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userHostname := c.Args().Get(userHostnameIndex)
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if userHostname == "" {
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return nil, cliutil.UsageError("The third argument should be the hostname")
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} else if !validateHostname(userHostname) {
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return nil, errors.Errorf("%s is not a valid hostname", userHostname)
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}
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return tunnelstore.NewDNSRoute(userHostname), nil
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}
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func lbRouteFromArg(c *cli.Context) (tunnelstore.Route, error) {
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const (
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lbNameIndex = 2
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lbPoolIndex = 3
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expectedNArgs = 4
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)
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if c.NArg() != expectedNArgs {
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return nil, cliutil.UsageError("Expected %d arguments, got %d", expectedNArgs, c.NArg())
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}
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lbName := c.Args().Get(lbNameIndex)
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if lbName == "" {
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return nil, cliutil.UsageError("The third argument should be the load balancer name")
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} else if !validateHostname(lbName) {
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return nil, errors.Errorf("%s is not a valid load balancer name", lbName)
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}
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lbPool := c.Args().Get(lbPoolIndex)
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if lbPool == "" {
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return nil, cliutil.UsageError("The fourth argument should be the pool name")
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} else if !validateName(lbPool) {
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return nil, errors.Errorf("%s is not a valid pool name", lbPool)
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}
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return tunnelstore.NewLBRoute(lbName, lbPool), nil
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}
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var nameRegex = regexp.MustCompile("^[_a-zA-Z0-9][-_.a-zA-Z0-9]*$")
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func validateName(s string) bool {
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return nameRegex.MatchString(s)
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}
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func validateHostname(s string) bool {
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// Slightly stricter than PunyCodeProfile
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idnaProfile := idna.New(
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idna.ValidateLabels(true),
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idna.VerifyDNSLength(true))
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puny, err := idnaProfile.ToASCII(s)
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return err == nil && validateName(puny)
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}
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func routeCommand(c *cli.Context) error {
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if c.NArg() < 2 {
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return cliutil.UsageError(`"cloudflared tunnel route" requires the first argument to be the route type(dns or lb), followed by the ID or name of the tunnel`)
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}
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sc, err := newSubcommandContext(c)
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if err != nil {
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return err
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}
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const tunnelIDIndex = 1
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routeType := c.Args().First()
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var route tunnelstore.Route
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var tunnelID uuid.UUID
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switch routeType {
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case "dns":
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tunnelID, err = sc.findID(c.Args().Get(tunnelIDIndex))
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if err != nil {
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return err
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}
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route, err = dnsRouteFromArg(c)
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if err != nil {
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return err
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}
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case "lb":
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tunnelID, err = sc.findID(c.Args().Get(tunnelIDIndex))
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if err != nil {
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return err
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}
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route, err = lbRouteFromArg(c)
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if err != nil {
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return err
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}
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default:
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return cliutil.UsageError("%s is not a recognized route type. Supported route types are dns and lb", routeType)
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}
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res, err := sc.route(tunnelID, route)
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if err != nil {
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return err
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}
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sc.logger.Infof(res.SuccessSummary())
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return nil
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}
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func commandHelpTemplate() string {
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var parentFlagsHelp string
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for _, f := range configureCloudflaredFlags(false) {
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parentFlagsHelp += fmt.Sprintf(" %s\n\t", f)
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}
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for _, f := range configureLoggingFlags(false) {
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parentFlagsHelp += fmt.Sprintf(" %s\n\t", f)
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}
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const template = `NAME:
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{{.HelpName}} - {{.Usage}}
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USAGE:
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{{.UsageText}}
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DESCRIPTION:
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{{.Description}}
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TUNNEL COMMAND OPTIONS:
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%s
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SUBCOMMAND COMMAND OPTIONS:
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{{range .VisibleFlags}}{{.}}
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|
{{end}}
|
|
`
|
|
return fmt.Sprintf(template, parentFlagsHelp)
|
|
}
|