Go HTTP tunnel

Go HTTP tunnel is a reverse tunnel based on HTTP/2. It enables you to share your localhost when you don't have a public IP.

Features:

• HTTP proxy with basic authentication
• TCP proxy
• SNI vhost proxy
• Client auto reconnect
• Client management and eviction
• Easy to use CLI

Common use cases:

• Hosting a game server from home
• Developing webhook integrations
• Managing IoT devices

Project Status

IF YOU WOULD LIKE TO SEE THIS PROJECT MODERNIZED PLEASE UPVOTE THE ISSUE.

Installation

Build the latest version.

$ go get -u github.com/hons82/go-http-tunnel/cmd/...

Alternatively download the latest release.

Running

There are two executables:

• tunneld - the tunnel server, to be run on publicly available host like AWS or GCE
• tunnel - the tunnel client, to be run on your local machine or in your private network

To get help on the command parameters run tunneld -h or tunnel -h.

Tunnel requires TLS certificates for both client and server.

$ openssl req -x509 -nodes -newkey rsa:2048 -sha256 -keyout client.key -out client.crt
$ openssl req -x509 -nodes -newkey rsa:2048 -sha256 -keyout server.key -out server.crt

Run client:

• Install tunnel binary
• Make .tunnel directory in your project directory
• Copy client.key, client.crt to .tunnel
• Create configuration file tunnel.yml in .tunnel
• Start all tunnels

$ tunnel -config ./tunnel/tunnel.yml start-all

Run server:

• Install tunneld binary
• Make .tunneld directory
• Copy server.key, server.crt to .tunneld
• Start tunnel server

$ tunneld -tlsCrt .tunneld/server.crt -tlsKey .tunneld/server.key

This will run HTTP server on port 80 and HTTPS (HTTP/2) server on port 443. If you want to use HTTPS it's recommended to get a properly signed certificate to avoid security warnings.

Run Server as a Service on Ubuntu using Systemd:

• After completing the steps above successfully, create a new file for your service (you can name it whatever you want, just replace the name below with your chosen name).

$ vim tunneld.service

• Add the following configuration to the file

[Unit]
Description=Go-Http-Tunnel Service
After=network.target
After=network-online.target

[Service]
ExecStart=/path/to/your/tunneld -tlsCrt /path/to/your/folder/.tunneld/server.crt -tlsKey /path/to/your/folder/.tunneld/server.key
TimeoutSec=30
Restart=on-failure
RestartSec=30

[Install]
WantedBy=multi-user.target

• Save and exit this file.
• Move this new file to /etc/systemd/system/

$ sudo mv tunneld.service /etc/systemd/system/

• Change the file permission to allow it to run.

$ sudo chmod u+x /etc/systemd/system/tunneld.service

• Start the new service and make sure you don't get any errors, and that your client is able to connect.

$ sudo systemctl start tunneld.service

• You can stop the service with:

$ sudo systemctl stop tunneld.service

• Finally, if you want the service to start automatically when the server is rebooted, you need to enable it.

$ sudo systemctl enable tunneld.service

There are many more options for systemd services, and this is by not means an exhaustive configuration file.

Configuration - Client

The tunnel client tunnel requires configuration file, by default it will try reading tunnel.yml in your current working directory. If you want to specify other file use -config flag.

Sample configuration that exposes:

• localhost:8080 as webui.my-tunnel-host.com
• host in private network for ssh connections

looks like this

    server_addr: SERVER_IP:5223
    tunnels:
      webui:
        proto: http
        addr: localhost:8080
        auth: user:password
        host: webui.my-tunnel-host.com
      ssh:
        proto: tcp
        addr: 192.168.0.5:22
        remote_addr: 0.0.0.0:22
      tls:
  	    proto: sni
  	    addr: localhost:443
  	    host: tls.my-tunnel-host.com

Configuration options:

• server_addr: server TCP address, i.e. 54.12.12.45:5223
• tls_crt: path to client TLS certificate, default: client.crt in the config file directory
• tls_key: path to client TLS certificate key, default: client.key in the config file directory
• root_ca: path to trusted root certificate authority pool file, if empty any server certificate is accepted
• tunnels / [name]
  • proto: tunnel protocol, http, tcp or sni
  • addr: forward traffic to this local port number or network address, for proto=http this can be full URL i.e. https://machine/sub/path/?plus=params, supports URL schemes http and https
  • auth: (proto=http) (optional) basic authentication credentials to enforce on tunneled requests, format user:password
  • host: (proto=http, proto=sni) hostname to request (requires reserved name and DNS CNAME)
  • remote_addr: (proto=tcp) bind the remote TCP address
• backoff
  • interval: how long client would wait before redialing the server if connection was lost, exponential backoff initial interval, default: 500ms
  • multiplier: interval multiplier if reconnect failed, default: 1.5
  • max_interval: maximal time client would wait before redialing the server, default: 1m
  • max_time: maximal time client would try to reconnect to the server if connection was lost, set 0 to never stop trying, default: 15m
• keep_alive
  • interval: the amount of time to wait between sending keepalive packets, default: 25s

Configuration - Server

• httpAddr: Public address for HTTP connections, empty string to disable, default: :80
• httpsAddr: Public address listening for HTTPS connections, emptry string to disable, default: :443
• tunnelAddr: Public address listening for tunnel client, default: :5223
• apiAddr: Public address for HTTP API to get info about the tunnels, default: :5091
• sniAddr: Public address listening for TLS SNI connections, empty string to disable
• tlsCrt: Path to a TLS certificate file, default: server.crt
• tlsKey: Path to a TLS key file, default: server.key
• rootCA: Path to the trusted certificate chian used for client certificate authentication, if empty any client certificate is accepted
• clients: Path to a properties file that contains a list of 'host=tunnelClientId's, if empty accept all clients
• keepAlive: the amount of time to wait between sending keepalive packets default: 45s
• logLevel: Level of messages to log, 0-3, default: 1

If both httpAddr and httpsAddr are configured, an automatic redirect to the secure channel will be established using an http.StatusMovedPermanently (301)

Custom error pages

Just copy the html folder from this repository into the folder of the tunnel-server to have a starting point. In the html/errors folder you'll find a sample page for each error that is currently customisable which you'll be able to change according to your needs.

Server API

If the apiAddr is properly set, the tunnel server offers a simple API to query its state.

/api/clients/list

Returns a list of clients together with a list of open tunnels in JSON format.

[
    {
        "Id": "BHXWUUT-A6IYDWI-2BSIC5A-...",
        "Listeners": [
            {
                "Network": "tcp",
                "Addr": "192.0.2.1:25"
            }
        ],
        "Hosts": [
            "tunnel1.my-tunnel-host.com"
        ]
    }
]

How it works

A client opens TLS connection to a server. The server accepts connections from known clients only. The client is recognized by its TLS certificate ID. The server is publicly available and proxies incoming connections to the client. Then the connection is further proxied in the client's network.

The tunnel is based HTTP/2 for speed and security. There is a single TCP connection between client and server and all the proxied connections are multiplexed using HTTP/2.

Donation

If this project help you reduce time to develop, you can give me a cup of coffee.

A GitHub star is always appreciated!

License

Copyright (C) 2017 Michał Matczuk

This project is distributed under the AGPL-3 license. See the LICENSE file for details. If you need an enterprice license contact me directly.