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RVPN Server

branch: passing-traffic

  • code now passes traffic using just daplie tools
  • this will require serve-https and node-tunnel-client to work

Build RVPN

hcamacho@Hanks-MBP:go-rvpn-server $ go get
hcamacho@Hanks-MBP:go-rvpn-server $ go build

Setup Some Entries

127.0.0.1 tunnel.example.com rvpn.daplie.invalid hfc2.daplie.me hfc.daplie.me

Start Up Webserver

hcamacho@Hanks-MBP:tmp $ cd /tmp
hcamacho@Hanks-MBP:tmp $  vi index.html --- Place some index content
hcamacho@Hanks-MBP:tmp $ serve-https -p 8080 -d /tmp --servername hfc.daplie.me --agree-tos --email henry.f.camacho@gmail.com

Start Tunnel Client

hcamacho@Hanks-MBP:node-tunnel-client $ bin/stunnel.js --locals http://hfc.daplie.me:8080,http://test1.hfc.daplie.me:8080 --stunneld wss://localhost.daplie.me:8443 --secret abc123

Execute RVPN

hcamacho@Hanks-MBP:go-rvpn-server $ ./go-rvpn-server 
INFO: packer: 2017/03/02 19:16:52.652109 run.go:47: startup
-=-=-=-=-=-=-=-=-=-=
INFO: genericlistener: 2017/03/02 19:16:52.652777 manager.go:77: ConnectionTable starting
INFO: genericlistener: 2017/03/02 19:16:52.652806 connection_table.go:67: ConnectionTable starting
INFO: genericlistener: 2017/03/02 19:16:52.652826 manager.go:84: &{map[] 0xc420072420 0xc420072480}
INFO: genericlistener: 2017/03/02 19:16:52.652832 connection_table.go:50: Reaper waiting for  300  seconds
INFO: genericlistener: 2017/03/02 19:16:52.652856 manager.go:100: register fired 8443
INFO: genericlistener: 2017/03/02 19:16:52.652862 manager.go:110: listener starting up  8443
INFO: genericlistener: 2017/03/02 19:16:52.652868 manager.go:111: &{map[] 0xc420072420 0xc420072480}
INFO: genericlistener: 2017/03/02 19:16:52.652869 conn_tracking.go:25: Tracking Running

Browse via tunnel

https://hfc.daplie.me:8443

  • You'll notice that the browser is redirected to 8080 after accepting the cert. I see a meta-refresh coming back from the serve-https
  • The traffic is getting back to the client.

INFO: genericlistener: 2017/03/02 21:24:48.472312 connection.go:207: 00000000  fe 1d 49 50 76 34 2c 31  32 37 2e 30 2e 30 2e 31  |..IPv4,127.0.0.1|
00000010  2c 35 33 35 35 39 2c 33  36 38 2c 68 74 74 70 48  |,53559,368,httpH|
00000020  54 54 50 2f 31 2e 31 20  32 30 30 20 4f 4b 0d 0a  |TTP/1.1 200 OK..|
00000030  43 6f 6e 74 65 6e 74 2d  54 79 70 65 3a 20 74 65  |Content-Type: te|
00000040  78 74 2f 68 74 6d 6c 3b  20 63 68 61 72 73 65 74  |xt/html; charset|
00000050  3d 75 74 66 2d 38 0d 0a  44 61 74 65 3a 20 46 72  |=utf-8..Date: Fr|
00000060  69 2c 20 30 33 20 4d 61  72 20 32 30 31 37 20 30  |i, 03 Mar 2017 0|
00000070  33 3a 32 34 3a 34 38 20  47 4d 54 0d 0a 43 6f 6e  |3:24:48 GMT..Con|
00000080  6e 65 63 74 69 6f 6e 3a  20 6b 65 65 70 2d 61 6c  |nection: keep-al|
00000090  69 76 65 0d 0a 43 6f 6e  74 65 6e 74 2d 4c 65 6e  |ive..Content-Len|
000000a0  67 74 68 3a 20 32 32 37  0d 0a 0d 0a 3c 68 74 6d  |gth: 227....<htm|
000000b0  6c 3e 0a 3c 68 65 61 64  3e 0a 20 20 3c 4d 45 54  |l>.<head>.  <MET|
000000c0  41 20 68 74 74 70 2d 65  71 75 69 76 3d 22 72 65  |A http-equiv="re|
000000d0  66 72 65 73 68 22 20 63  6f 6e 74 65 6e 74 3d 22  |fresh" content="|
000000e0  30 3b 55 52 4c 3d 27 68  74 74 70 73 3a 2f 2f 68  |0;URL='https://h|
000000f0  66 63 2e 64 61 70 6c 69  65 2e 6d 65 3a 38 30 38  |fc.daplie.me:808|
00000100  30 2f 27 22 3e 0a 3c 2f  68 65 61 64 3e 0a 3c 62  |0/'">.</head>.<b|
00000110  6f 64 79 3e 0a 3c 21 2d  2d 20 48 65 6c 6c 6f 20  |ody>.<!-- Hello |
00000120  4d 72 20 44 65 76 65 6c  6f 70 65 72 21 20 57 65  |Mr Developer! We|
00000130  20 64 6f 6e 27 74 20 73  65 72 76 65 20 69 6e 73  | don't serve ins|
00000140  65 63 75 72 65 20 72 65  73 6f 75 72 63 65 73 20  |ecure resources |
00000150  61 72 6f 75 6e 64 20 68  65 72 65 2e 0a 20 20 20  |around here..   |
00000160  20 50 6c 65 61 73 65 20  75 73 65 20 48 54 54 50  | Please use HTTP|
00000170  53 20 69 6e 73 74 65 61  64 2e 20 2d 2d 3e 0a 3c  |S instead. -->.<|
00000180  2f 62 6f 64 79 3e 0a 3c  2f 68 74 6d 6c 3e 0a     |/body>.</html>.|
  • this set of code works great if I am running the node-tunnel-client on a different machine with apache as a web server.
  • need to work through why serve-https thinks the traffic is inecure.

restructured-http

  • connection handling has been totally rewritten.
  • on a specific port RVPN can determine the following:
    • if a connection is encrypted or not encrypted
    • if a request is a wss_client
    • if a request is an admin/api request
    • if a request is a plain (to be forwarded) http request
    • or if a request is a different protocol (perhaps SSH)

To accomplish the above RVPN uses raw TCP sockets, buffered readers, and a custom Listener. This allows protocol detection (multiple services on one port) If we expose 443 and 80 to maximize the ability for tunnel clients and south bound traffic, the RVPN is able to deal with this traffic on a limited number of ports, and the most popular ports. It is possible now to meter any point of the connection (not Interface Level, rather TCP)

There is now a connection manager that dynamically allows new GenericListeners to start on different ports when needed....

	newListener := NewListenerRegistration(initialPort)
	gl.register <- newListener

A new listener is created by sending a NewListenerRegistration on the channel.


	ln, err := net.ListenTCP("tcp", listenAddr)
	if err != nil {
		loginfo.Println("unable to bind", err)
		listenerRegistration.status = listenerFault
		listenerRegistration.err = err
		listenerRegistration.commCh <- listenerRegistration
		return
	}

	listenerRegistration.status = listenerAdded
	listenerRegistration.commCh <- listenerRegistration

Once the lister is fired up, I sends back a regisration status to the manager along with the new Listener and status.

Build


hcamacho@Hanks-MBP:go-rvpn-server $ go get
hcamacho@Hanks-MBP:go-rvpn-server $ go build

Execute RVPN


hcamacho@Hanks-MBP:go-rvpn-server $ ./go-rvpn-server 
INFO: packer: 2017/02/26 12:43:53.978133 run.go:48: startup
-=-=-=-=-=-=-=-=-=-=
INFO: connection: 2017/02/26 12:43:53.978959 connection_table.go:67: ConnectionTable starting
INFO: connection: 2017/02/26 12:43:53.979000 connection_table.go:50: Reaper waiting for  300  seconds

Connect Tunnel client


hcamacho@Hanks-MBP:node-tunnel-client $ bin/stunnel.js --locals http://hfc.daplie.me:8443,http://test.hfc.daplie.me:3001,http://127.0.0.1:8080 --stunneld wss://localhost.daplie.me:8443 --secret abc123
[local proxy] http://hfc.daplie.me:8443
[local proxy] http://test.hfc.daplie.me:3001
[local proxy] http://127.0.0.1:8080
[connect] 'wss://localhost.daplie.me:8443'
[open] connected to 'wss://localhost.daplie.me:8443'

Connect Admin

  • add a host entry

127.0.0.1 tunnel.example.com rvpn.daplie.invalid


browse https://rvpn.daplie.invalid:8443

Send some traffic


hcamacho@Hanks-MBP:node-tunnel-client $ bin/stunnel.js --locals http://hfc.daplie.me:8443,http://test.hfc.daplie.me:3001,http://127.0.0.1:8080 --stunneld wss://localhost.daplie.me:8443 --secret abc123
[local proxy] http://hfc.daplie.me:8443
[local proxy] http://test.hfc.daplie.me:3001
[local proxy] http://127.0.0.1:8080
[connect] 'wss://localhost.daplie.me:8443'
[open] connected to 'wss://localhost.daplie.me:8443'
hello
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
<0A>IPv4,127.0.0.1,8080,413,httpGET / HTTP/1.1
Host: 127.0.0.1:8443
Connection: keep-alive
Cache-Control: max-age=0
Upgrade-Insecure-Requests: 1
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_3) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/56.0.2924.87 Safari/537.36
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8
Accept-Encoding: gzip, deflate, sdch, br
Accept-Language: en-US,en;q=0.8


[exit] loop closed 0

Looks like it aborts for some reaon. I have this problem on on a new installation as well.

-=-=-=-=-=-=

A Poor Man's Reverse VPN written in Go

Context

Even in the worst of conditions the fanciest of firewalls can't stop a WebSocket running over https from creating a secure tunnel.

Whether at home behind a router that lacks UPnP compliance, at school, work, the library - or even on an airplane, we want any device (or even a browser or app) to be able to serve from anywhere.

Motivation

We originally wrote this in node.js as node-tunnel-server, but there are a few problems:

  • metering
  • resource utilization
  • binary transfer

metering

We want to be able to meter all traffic on a socket. In node.js it wasn't feasible to be able to track the original socket handle all the way back from the web socket authentication through the various wrappers.

A user connects via a websocket to the tunnel server and an authentication token is presented. If the connection is established the socket should then be metered and reported including total bytes sent and received and size of payload bytes sent and received (because the tunnelling adds some overhead).

resource utilization

node.js does not support usage of multiple cores in-process. The overhead of passing socket connections between processes seemed non-trivial at best and likely much less efficient, and impossible at worst.

binary transfer

node.js doesn't handle binary data very well. People will be transferring gigabytes of data.

Short Term Goal

Build a server compatible with the node.js client (JWT authentication) that can meter authenticated connections, utilize multiple cores efficiently, and efficienty garbage collect gigabytes upon gigabytes of transfer.