Tunnel by way of Cloudflare to any TCP Service

2023-05-19 17:01:45

Cloudflare’s cloudflared tunnels are generally used to ‘publish’ an online server that runs behind a firewall (e.g. making the webserver accessible from the Web). Cloudflare restricts the visitors to HTTP-style visitors: It will not permit the publishing of SSHD for instance.

This text explains ‘publish’ some other service (like SSHD) and make it accessible by way of the cloudflared tunnel. It does so by including a WebSocket Proxy on both facet of the tunnel.

You want websocat, cloudflared and gost.

Instance 1:

Configure a tunnel to entry SSHD on a server that’s behind the firewall (by way of Cloudflare’s cloudflared tunnel).

On the server behind the firewall:


websocat -E -b ws-l:127.0.0.1:40008 tcp:127.0.0.1:22 &

cloudflared tunnel --url http://localhost:40008 --no-autoupdate

The CF tunnel will present you an URL much like this one:

In your workstation:


websocat -E -b tcp-l:127.0.0.1:2222 ws://<YourUrlFromAbove>.trycloudflare.com &

ssh -p 2222 root@127.0.0.1

Instance 2:

A extra superior technique is so as to add a Socks5 Proxy to the chain of tunnels. This may permit us to entry ANYTHING from our workstation: That is any host throughout the LAN and any host on the Web.

The Gost device helps WS and Socks5 and is used as a substitute of websocat and microsocks.

On the server behind the firewall:

gost -L mws://:40009 &
cloudflared tunnel --url http://localhost:40009 --no-autoupdate

In your workstation:

gost -L :1080 -F 'mwss://<YourUrlFromAbove>.trycloudflare.com:443'

Use some instruments by way of the Socks Tunnel (by way of Cloudflare/Websocket):


curl -x socks5h://0 ipinfo.io


echo -e "[ProxyList]nsocks5 127.0.0.1 1080" >computer.conf

proxychains -f computer.conf -q ssh root@192.168.1.1

proxychains -f computer.conf -q nmap -nF -Pn -sT --open scanme.nmap.org

Notes:

Cloudflare’s Free Service limits the number of connections. Think about upgrading.
See Also

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Apple OSes Are Insecure By Design To Support Surveillance
We use mwss and mws to allow TCP multiplexing (channelling) by way of a single TCP connection in Gost. All TCP connections will go by way of a single CF tunnel (and a single Websocket-request).
We use wss (with TLS) on the workstation however simply ws (with out TLS) on the server. It’s because Cloudflare is the Edge-Server and the TLS connection stops there. Cloudflare then re-encrypts the info to ship it by way of Cloudflared to our server. A Cloudflare tunnel is rarely (!) Finish-2-Finish encrypted: Use SSH or different encrypted instruments if you don’t belief CloudFlare (as they will learn your information).

All examples from this text had been examined on Segfault’s Disposable Root Servers.

Thanks to EMX for proofreading.

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