cloudflared-mirror/cmd/cloudflared/access/carrier.go

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package access
import (
"net/http"
"net/url"
"strings"
"github.com/cloudflare/cloudflared/carrier"
"github.com/cloudflare/cloudflared/cmd/cloudflared/config"
"github.com/cloudflare/cloudflared/validation"
"github.com/pkg/errors"
cli "gopkg.in/urfave/cli.v2"
)
// ssh will start a WS proxy server for server mode
// or copy from stdin/stdout for client mode
// useful for proxying other protocols (like ssh) over websockets
// (which you can put Access in front of)
func ssh(c *cli.Context) error {
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// get the hostname from the cmdline and error out if its not provided
rawHostName := c.String(sshHostnameFlag)
hostname, err := validation.ValidateHostname(rawHostName)
if err != nil || rawHostName == "" {
return cli.ShowCommandHelp(c, "ssh")
}
originURL := ensureURLScheme(hostname)
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// get the headers from the cmdline and add them
headers := buildRequestHeaders(c.StringSlice(sshHeaderFlag))
if c.IsSet(sshTokenIDFlag) {
headers.Add("CF-Access-Client-Id", c.String(sshTokenIDFlag))
}
if c.IsSet(sshTokenSecretFlag) {
headers.Add("CF-Access-Client-Secret", c.String(sshTokenSecretFlag))
}
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destination := c.String(sshDestinationFlag)
if destination != "" {
headers.Add("CF-Access-SSH-Destination", destination)
}
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options := &carrier.StartOptions{
OriginURL: originURL,
Headers: headers,
}
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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
wsConn := carrier.NewWSConnection(logger, false)
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if c.NArg() > 0 || c.IsSet(sshURLFlag) {
localForwarder, err := config.ValidateUrl(c)
if err != nil {
logger.WithError(err).Error("Error validating origin URL")
return errors.Wrap(err, "error validating origin URL")
}
forwarder, err := url.Parse(localForwarder)
if err != nil {
logger.WithError(err).Error("Error validating origin URL")
return errors.Wrap(err, "error validating origin URL")
}
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logger.Infof("Start Websocket listener on: %s", forwarder.Host)
return carrier.StartForwarder(wsConn, forwarder.Host, shutdownC, options)
}
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return carrier.StartClient(wsConn, &carrier.StdinoutStream{}, options)
}
func buildRequestHeaders(values []string) http.Header {
headers := make(http.Header)
for _, valuePair := range values {
split := strings.Split(valuePair, ":")
if len(split) > 1 {
headers.Add(strings.TrimSpace(split[0]), strings.TrimSpace(split[1]))
}
}
return headers
}