turnproxy

turn ~server~ into something you can see through

a small script that

• tests TCP connectivity between your turn-server and any peer-destination
• uses your turn-server as TCP proxy with SOCKS interface

usage

➜ python turnproxy.py --help
usage: turnproxy command

test your turn-server tcp relay and use it as a proxy with socks interface

optional arguments:
  -h, --help  show this help message and exit

command:

    test      ask turn server to create a tcp connection to your peer host
    run       run a socks proxy via your turn server

• test connection to good peer 8.8.8.8:53

➜ python turnproxy.py test -t <turn_host>:<turn_port> -u username -p password -c 8.8.8.8:53
Turn server == <turn_host>:<turn_port>
Connecting to peer --> 8.8.8.8:53
Connection OK

• test connection to bad peer 8.8.8.8:54

➜ python turnproxy.py test -t <turn_host>:<turn_port> -u username -p password -c 8.8.8.8:54
Turn server == <turn_host>:<turn_port>
Connecting to peer --> 8.8.8.8:53
Error 447: b'Connection Timeout or Failure\x00\x00\x00'

• listen on 127.0.0.1:9999 as SOCKS proxy

➜ python turnproxy.py run -t <turn_host>:<turn_port> -u username -p password -s 127.0.0.1:9999
Turn server == <turn_host>:<turn_port>
Socks server listening <-- 127.0.0.1:9999
127.0.0.1:2330 - Connected
127.0.0.1:2330 - SOCKS established
127.0.0.1:2330 - Client disconnected
127.0.0.1:2335 - Connected
...

• config socks proxy for your http, ssh, redis, mysql, ... clients and enjoy 😉

• enable flag -d or --debug if you are curious

docs

this work is heavily inspired from the awesome disclosure below

• https://www.rtcsec.com/2020/04/01-slack-webrtc-turn-compromise/

qa

what is turn ?

• https://tools.ietf.org/html/rfc5766

then, what is stun ?

• https://tools.ietf.org/html/rfc5389
• https://tools.ietf.org/html/rfc3489

where they are used ?

• https://webrtc.org/
• https://en.wikipedia.org/wiki/Session_Initiation_Protocol

i mean where?

• http://messenger.com/
• https://discordapp.com/
• https://slack.com/
• http://cloudretro.io/

thats too much info, i just want to test this script

• https://meetrix.io/blog/webrtc/coturn/installation.html