python script to transparently forward all TCP and DNS traffic through a socks (like ssh -D option) or HTTPS (CONNECT) proxy using iptables -j REDIRECT target. Only works on linux for now.
- set up a local transparent proxy compatible with socks4 socks5 and HTTP CONNECT proxies allowing to forward any TCP traffic transparently using iptables
- set up a local transparent DNS proxy translating UDP port 53 requests to TCP allowing DNS traffic to go through a proxy without UDP support (like ssh -D option)
- DNS caching mechanism to speed up the DNS resolutions through pr0cks
As an example we will use the socks5 proxy of openssh (the option -D)
$ ssh -D 1080 user@sshserver
then you can add some iptables rules :
$ iptables -t nat -A OUTPUT ! -d <my_ssh_server_IP>/32 -o eth0 -p tcp -m tcp -j REDIRECT --to-ports 10080
$ iptables -t nat -A OUTPUT -o eth0 -p udp -m udp --dport 53 -j REDIRECT --to-ports 1053
then start pr0cks :
$ python pr0cks.py --proxy SOCKS5:127.0.0.1:1080
All your TCP traffic and DNS traffic should now pass through the ssh server kinda like if you had setup a tun VPN through ssh but without admin rights on the server ! #help
python pr0cks.py -h
usage: procks [-h] [--proxy PROXY] [-p PORT] [-v] [--username USERNAME]
[--password PASSWORD] [--dns-port DNS_PORT]
[--dns-server DNS_SERVER]
Transparent SOCKS5/SOCKS4/HTTP_CONNECT Proxy
optional arguments:
-h, --help show this help message and exit
--proxy PROXY proxytype:ip:port to forward our connections through.
proxytype can be SOCKS5, SOCKS4 or HTTP
-p PORT, --port PORT port to bind the transparent proxy on the local socket
(default 10080)
-v, --verbose print all the connections requested through the proxy
--username USERNAME Username to authenticate with to the server. The
default is no authentication.
--password PASSWORD Only relevant when a username has been provided
--dns-port DNS_PORT dns port to listen on (default 1053)
--dns-server DNS_SERVER
ip:port of the DNS server to forward all DNS requests
to using TCP through the proxy (default
208.67.222.222:53)
- dnslib (https://pypi.python.org/pypi/dnslib) for DNS UDP to TCP translation support
- tested with Python 2.7
- support UDP (with socks5)
- support proxy chaining
Don't hesitate to send me your feedback or any issue you may find
I hope it will be useful to someone ! Have fun :)