telebit.js/README.md

# Telebit™ Remote

Because friends don't let friends localhost™

| Sponsored by [ppl](https://ppl.family)
| **Telebit Remote**
| [Telebit Relay](https://git.coolaj86.com/coolaj86/telebitd.js)
|

Break out of localhost.
=======

If you need to get bits from here to there, Telebit gets the job done.

Install Telebit Remote on any device - your laptop, raspberry pi, whatever -
and now you can access that device from anywhere, even securely in a web browser.

How does it work?
It's a net server that uses a relay to allow multiplexed incoming connections
on any external port.

Features
--------

* [x] Show your mom the web app you're working on
* [x] Access your Raspberry Pi from behind a firewall
* [x] Watch Netflix without region restrictions while traveling
* [x] SSH over HTTPS on networks with restricted ports or protocols
* [x] Access your wife's laptop while she's on a flight

<!-- TODO use some imagery -->

Examples
========

```
telebit http /path/to/root
telebit http 3000
telebit http /path/to/handler.js
telebit ssh 22
telebit tcp 3000
telebit tcp echo
telebit tcp /path/to/handler.js
```

Install
=======

Mac & Linux
-----------

Open Terminal and run this install script:

```
curl -fsSL https://get.telebit.cloud/ | bash
```

Of course, feel free to inspect the install script before you run it.

This will install Telebit Remote to `/opt/telebit` and
put a symlink to `/opt/telebit/bin/telebit` in `/usr/local/bin/telebit`
for convenience.

You can customize the installation:

```bash
export NODEJS_VER=v10.2
export TELEBIT_PATH=/opt/telebit
curl -fsSL https://get.telebit.cloud/
```

That will change the bundled version of node.js is bundled with Telebit Relay
and the path to which Telebit Relay installs.

You can get rid of the tos + email and server domain name prompts by providing them right away:

```bash
curl -fsSL https://get.telebit.cloud/ | bash -- jon@example.com example.com telebit.example.com xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
```

Windows & Node.js
-----------------

1. Install [node.js](https://nodejs.org)
2. Open _Node.js_
2. Run the command `npm install -g telebit`

**Note**: Use node.js v8.x or v10.x

There is [a bug](https://github.com/nodejs/node/issues/20241) in node v9.x that causes telebit to crash.

Usage
====

```bash
telebit --config /etc/telebit/telebit.yml
```

Options

`/etc/telebit/telebit.yml:`
```
email: 'jon@example.com'          # must be valid (for certificate recovery and security alerts)
agree_tos: true                   # agree to the Telebit, Greenlock, and Let's Encrypt TOSes
community_member: true            # receive infrequent relevant but non-critical updates
telemetry: true                   # contribute to project telemetric data
secret: ''                        # Secret with which to sign Tokens for authorization
token: ''                         # A signed Token for authorization
servernames:                      # servernames that will be forwarded here
  example.com: {}
dynamic_ports: []
```

## Important Defaults

The default behaviors work great for newbies,
but can be confusing or annoying to experienced networking veterans.

See the **Advanced Configuration** section below for more details.

<!--
```
redirect:
  example.com/foo: /bar
  '*': whatever.com/
vhost:                            # securely serve local sites from this path (or false)
  example.com: /srv/example.com   # (uses template string, i.e. /var/www/:hostname/public)
  '*': /srv/www/:hostname
reverse_proxy: /srv/
  example.com: 3000
  '*': 3000
terminate_tls:
  'example.com': 3000
  '*': 3000
tls:
  'example.com': 8443
  '*': 8443
port_forward:
  2020: 2020
  '*': 4040

greenlock:
  store: le-store-certbot         # certificate storage plugin
  config_dir: /etc/acme           # directory for ssl certificates
```
-->

Using Telebit with node.js
--------------------------

Telebit has two parts:
  * the local server
  * the relay service

This repository is for the local server, which you run on the computer or device that you would like to access.

This is the portion that runs on your computer
You will need both Telebit (this, telebit.js) and a Telebit Relay
(such as [telebitd.js](https://git.coolaj86.com/coolaj86/telebitd.js)).

You can **integrate telebit.js into your existing codebase** or use the **standalone CLI**.

* CLI
* Node.js Library
* Browser Library

Telebit CLI
-----------

Installs Telebit Remote as `telebit`
(for those that regularly use `telebit` but still like commandline completion).

### Install

```bash
npm install -g telebit
```

```bash
npm install -g 'https://git.coolaj86.com/coolaj86/telebit.js.git#v1'
```

Or if you want to bow down to the kings of the centralized dictator-net:

How to use Telebit Remote with your own instance of Telebit Relay:

```bash
telebit \
  --locals <<external domain name>> \
  --relay wss://<<tunnel domain>>:<<tunnel port>> \
  --secret <<128-bit hex key>>
```

```bash
telebit --locals john.example.com --relay wss://tunnel.example.com:443 --secret abc123
```

```bash
telebit \
  --locals <<protocol>>:<<external domain name>>:<<local port>> \
  --relay wss://<<tunnel domain>>:<<tunnel port>> \
  --secret <<128-bit hex key>>
```

```bash
telebit \
  --locals http:john.example.com:3000,https:john.example.com \
  --relay wss://tunnel.example.com:443 \
  --secret abc123
```

```
--secret          the same secret used by the Telebit Relay (for authentication)
--locals          comma separated list of <proto>:<servername>:<port> to which
                  incoming http and https should be forwarded
--relay        the domain or ip address at which you are running Telebit Relay
-k, --insecure    ignore invalid ssl certificates from relay
```

Node.js Library
=======

### Example

```javascript
var Telebit = require('telebit');

Telebit.connect({
  relay: 'wss://tunnel.example.com'
, token: '...'
, locals: [
    // defaults to sending http to local port 80 and https to local port 443
    { hostname: 'doe.net' }

    // sends both http and https to local port 3000 (httpolyglot)
  , { protocol: 'https', hostname: 'john.doe.net', port: 3000 }

    // send http to local port 4080 and https to local port 8443
  , { protocol: 'https', hostname: 'jane.doe.net', port: 4080 }
  , { protocol: 'https', hostname: 'jane.doe.net', port: 8443 }
  ]

, net: require('net')
, insecure: false
});
```

* You can get sneaky with `net` and provide a `createConnection` that returns a `stream.Duplex`.

### Token

```javascript
var tokenData = { domains: [ 'doe.net', 'john.doe.net', 'jane.doe.net' ] }
var secret = 'shhhhh';
var token = jwt.sign(tokenData, secret);
```

### net

Let's say you want to handle http requests in-process
or decrypt https before passing it to the local http handler.

You'll need to create a pair of streams to connect between the
local handler and the tunnel handler.

You could do a little magic like this:

```js
Telebit.connect({
  // ...
, net: {
  createConnection: function (info, cb) {
    // data is the hello packet / first chunk
    // info = { data, servername, port, host, remoteAddress: { family, address, port } }

    var streamPair = require('stream-pair');

    // here "reader" means the socket that looks like the connection being accepted
    var writer = streamPair.create();
    // here "writer" means the remote-looking part of the socket that driving the connection
    var reader = writer.other;
    // duplex = { write, push, end, events: [ 'readable', 'data', 'error', 'end' ] };

    reader.remoteFamily = info.remoteFamily;
    reader.remoteAddress = info.remoteAddress;
    reader.remotePort = info.remotePort;

    // socket.local{Family,Address,Port}
    reader.localFamily = 'IPv4';
    reader.localAddress = '127.0.01';
    reader.localPort = info.port;

    httpsServer.emit('connection', reader);

    if (cb) {
      process.nextTick(cb);
    }

    return writer;
  }
});
```

Advanced Configuration
======================

There is no configuration for these yet,
but we believe it is important to add them.

### http to https

By default http connections are redirected to https.

If for some reason you need raw access to unencrypted http
you'll need to set it manually.

Proposed configuration:

```
insecure_http:
  proxy: true         # add X-Forward-* headers
  port: 3000          # connect to port 3000
  hostnames:          # only these hostnames will be left insecure
    - example.com
```

**Note**: In the future unencrypted connections will only be allowed
on self-hosted and paid-hosted Telebit Relays. We don't want the
legal liability of transmitting your data in the clear, thanks. :p

### TLS Termination (Secure SSL decryption)

Telebit is designed for end-to-end security.

For convenience the Telebit Remote client uses Greenlock to handle all
HTTPS connections and then connect to a local webserver with the correct proxy headers.

However, if you want to handle the encrypted connection directly, you can:

Proposed Configuration:

```
tls:
  example.com: 3000   # specific servername
  '*': 3000           # all servernames
  '!': 3000           # missing servername
```

TODO
====

Install for user
  * https://wiki.archlinux.org/index.php/Systemd/User
  * https://developer.apple.com/library/content/documentation/MacOSX/Conceptual/BPSystemStartup/Chapters/CreatingLaunchdJobs.html
    * `sudo launchctl load -w ~/Library/LaunchAgents/cloud.telebit.remote`
    * https://serverfault.com/questions/194832/how-to-start-stop-restart-launchd-services-from-the-command-line

Browser Library
=======

This is implemented with websockets, so you should be able to

LICENSE
=======

Copyright 2016 AJ ONeal