A dns proxy/tunnel for ssh over dns
git clone https://github.com/calledit/dns-tunnler.git
cd dns-tunnler
npm install [email protected] stdio requestSetup a dns NS record (ex proxy.example.com) directed to your server (ex 123.123.123.123) and on the server run
nodejs dnsProxyServer.js -d proxy.example.com -p 53 -vI recomend runing it on another port than 53 and redirecting with some iptables rules so that you dont run the program as root.
example
# External accept udp for external dns
-A INPUT -i $EXTIF -m conntrack --ctstate NEW,ESTABLISHED,RELATED -p udp -s $UNIVERSE -d $EXTIP --dport 5453 -j ACCEPT
#External dns redirect from port 53 to 5453
-A PREROUTING -p udp -d $EXTIP --dport 53 -m conntrack --ctstate NEW,ESTABLISHED,RELATED -j REDIRECT --to-port 5453
To connect with ssh you can run:
ssh -C -o ProxyCommand="node dnsProxyClient.js -d proxy.example.com" [email protected]Log data throgh dns from a client:
nslookup ${logdata}.logpwd.proxy.example.comReplace proxy.example.com with your own dns name. There are a few timing baed parameters that effect speed and latency reducing -t from the default 500 ms lowers the latency at the expense of more frequent requests.