2018-10-19 20:44:35 +00:00
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package access
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2018-09-21 15:18:23 +00:00
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import (
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2021-02-03 19:00:55 +00:00
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"crypto/tls"
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"fmt"
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2019-02-07 16:56:33 +00:00
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"net/http"
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"strings"
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2018-09-21 15:18:23 +00:00
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"github.com/cloudflare/cloudflared/carrier"
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2021-03-08 16:46:23 +00:00
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"github.com/cloudflare/cloudflared/config"
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2020-05-04 20:15:17 +00:00
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"github.com/cloudflare/cloudflared/h2mux"
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2020-04-29 20:51:32 +00:00
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"github.com/cloudflare/cloudflared/logger"
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2021-03-02 20:35:40 +00:00
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"github.com/cloudflare/cloudflared/token"
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2018-09-21 15:18:23 +00:00
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"github.com/cloudflare/cloudflared/validation"
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2020-11-25 06:55:13 +00:00
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2018-09-21 15:18:23 +00:00
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"github.com/pkg/errors"
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2020-11-25 06:55:13 +00:00
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"github.com/rs/zerolog"
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2020-11-15 01:49:44 +00:00
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"github.com/urfave/cli/v2"
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2018-09-21 15:18:23 +00:00
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)
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2020-12-28 18:10:01 +00:00
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const (
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LogFieldHost = "host"
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)
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2020-04-13 17:22:00 +00:00
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// StartForwarder starts a client side websocket forward
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2020-11-25 06:55:13 +00:00
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func StartForwarder(forwarder config.Forwarder, shutdown <-chan struct{}, log *zerolog.Logger) error {
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2020-10-08 10:12:26 +00:00
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validURL, err := validation.ValidateUrl(forwarder.Listener)
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2020-04-13 17:22:00 +00:00
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if err != nil {
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return errors.Wrap(err, "error validating origin URL")
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}
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2020-06-08 22:01:48 +00:00
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// get the headers from the config file and add to the request
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headers := make(http.Header)
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if forwarder.TokenClientID != "" {
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headers.Set(h2mux.CFAccessClientIDHeader, forwarder.TokenClientID)
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}
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if forwarder.TokenSecret != "" {
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headers.Set(h2mux.CFAccessClientSecretHeader, forwarder.TokenSecret)
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}
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2020-06-12 16:57:21 +00:00
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if forwarder.Destination != "" {
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headers.Add(h2mux.CFJumpDestinationHeader, forwarder.Destination)
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}
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2020-04-13 17:22:00 +00:00
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options := &carrier.StartOptions{
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OriginURL: forwarder.URL,
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2020-06-08 22:01:48 +00:00
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Headers: headers, //TODO: TUN-2688 support custom headers from config file
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2020-04-13 17:22:00 +00:00
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}
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// we could add a cmd line variable for this bool if we want the SOCK5 server to be on the client side
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2021-02-10 16:19:55 +00:00
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wsConn := carrier.NewWSConnection(log)
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2020-04-13 17:22:00 +00:00
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2020-12-28 18:10:01 +00:00
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log.Info().Str(LogFieldHost, validURL.Host).Msg("Start Websocket listener")
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2020-04-13 17:22:00 +00:00
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return carrier.StartForwarder(wsConn, validURL.Host, shutdown, options)
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}
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2018-09-21 15:18:23 +00:00
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// ssh will start a WS proxy server for server mode
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// or copy from stdin/stdout for client mode
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// useful for proxying other protocols (like ssh) over websockets
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// (which you can put Access in front of)
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func ssh(c *cli.Context) error {
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2020-11-25 06:55:13 +00:00
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log := logger.CreateSSHLoggerFromContext(c, logger.EnableTerminalLog)
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2020-04-29 20:51:32 +00:00
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2019-01-23 21:42:10 +00:00
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// get the hostname from the cmdline and error out if its not provided
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rawHostName := c.String(sshHostnameFlag)
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hostname, err := validation.ValidateHostname(rawHostName)
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if err != nil || rawHostName == "" {
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2018-10-19 20:44:35 +00:00
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return cli.ShowCommandHelp(c, "ssh")
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2018-09-21 15:18:23 +00:00
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}
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2019-10-22 15:41:44 +00:00
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originURL := ensureURLScheme(hostname)
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2019-01-23 21:42:10 +00:00
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// get the headers from the cmdline and add them
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headers := buildRequestHeaders(c.StringSlice(sshHeaderFlag))
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if c.IsSet(sshTokenIDFlag) {
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2020-06-08 22:01:48 +00:00
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headers.Set(h2mux.CFAccessClientIDHeader, c.String(sshTokenIDFlag))
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2019-01-23 21:42:10 +00:00
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}
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if c.IsSet(sshTokenSecretFlag) {
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2020-06-08 22:01:48 +00:00
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headers.Set(h2mux.CFAccessClientSecretHeader, c.String(sshTokenSecretFlag))
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2019-03-06 19:09:13 +00:00
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}
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2019-01-23 21:42:10 +00:00
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2019-10-02 20:56:28 +00:00
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destination := c.String(sshDestinationFlag)
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2019-10-11 17:26:23 +00:00
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if destination != "" {
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2020-05-04 20:15:17 +00:00
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headers.Add(h2mux.CFJumpDestinationHeader, destination)
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2019-10-02 20:56:28 +00:00
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}
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2019-01-23 21:42:10 +00:00
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options := &carrier.StartOptions{
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2019-05-22 20:41:21 +00:00
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OriginURL: originURL,
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Headers: headers,
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2021-02-03 19:00:55 +00:00
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Host: hostname,
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}
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if connectTo := c.String(sshConnectTo); connectTo != "" {
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parts := strings.Split(connectTo, ":")
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switch len(parts) {
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case 1:
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options.OriginURL = fmt.Sprintf("https://%s", parts[0])
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case 2:
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options.OriginURL = fmt.Sprintf("https://%s:%s", parts[0], parts[1])
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case 3:
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options.OriginURL = fmt.Sprintf("https://%s:%s", parts[2], parts[1])
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options.TLSClientConfig = &tls.Config{
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InsecureSkipVerify: true,
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2021-02-10 16:19:55 +00:00
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ServerName: parts[0],
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2021-02-03 19:00:55 +00:00
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}
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log.Warn().Msgf("Using insecure SSL connection because SNI overridden to %s", parts[0])
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default:
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return fmt.Errorf("invalid connection override: %s", connectTo)
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}
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2019-03-06 19:09:13 +00:00
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}
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2018-09-21 15:18:23 +00:00
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2021-03-02 20:35:40 +00:00
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originReq, err := http.NewRequest(http.MethodGet, options.OriginURL, nil)
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if err != nil {
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return err
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}
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appInfo, err := token.GetAppInfo(originReq.URL)
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if err != nil {
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return err
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}
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options.AppInfo = appInfo
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2020-03-31 14:56:22 +00:00
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// we could add a cmd line variable for this bool if we want the SOCK5 server to be on the client side
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2021-02-10 16:19:55 +00:00
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wsConn := carrier.NewWSConnection(log)
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2020-03-31 14:56:22 +00:00
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2019-01-23 21:42:10 +00:00
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if c.NArg() > 0 || c.IsSet(sshURLFlag) {
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2020-10-08 10:12:26 +00:00
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forwarder, err := config.ValidateUrl(c, true)
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2018-09-21 15:18:23 +00:00
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if err != nil {
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2020-12-28 18:10:01 +00:00
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log.Err(err).Msg("Error validating origin URL")
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2018-09-21 15:18:23 +00:00
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return errors.Wrap(err, "error validating origin URL")
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}
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2020-12-28 18:10:01 +00:00
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log.Info().Str(LogFieldHost, forwarder.Host).Msg("Start Websocket listener")
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2020-04-29 20:51:32 +00:00
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err = carrier.StartForwarder(wsConn, forwarder.Host, shutdownC, options)
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if err != nil {
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2020-12-28 18:10:01 +00:00
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log.Err(err).Msg("Error on Websocket listener")
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2020-04-29 20:51:32 +00:00
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}
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return err
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2018-09-21 15:18:23 +00:00
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}
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2020-03-31 14:56:22 +00:00
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return carrier.StartClient(wsConn, &carrier.StdinoutStream{}, options)
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2019-02-07 16:56:33 +00:00
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}
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func buildRequestHeaders(values []string) http.Header {
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headers := make(http.Header)
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for _, valuePair := range values {
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split := strings.Split(valuePair, ":")
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if len(split) > 1 {
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headers.Add(strings.TrimSpace(split[0]), strings.TrimSpace(split[1]))
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}
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}
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return headers
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2018-09-21 15:18:23 +00:00
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}
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