shootback

is a reverse TCP tunnel let you access target behind NAT or firewall. Consumes less than 1% CPU and 8MB memory under 800 concurrency. slaver is single file and only depends on python(2.7/3.4+) standard library.

How it works

Typical Scene

1. Access company/school computer(no internet IP) from home
2. Make a private network/site public.
3. Help private network penetration.
4. Help CTF offline competitions.
5. Connect to a device with dynamic IP, such as ADSL

Getting started

1. requirement:
   • Master: Python3.4+, OS independent
   • Slaver: Python2.7/3.4+, OS independent
   • no external dependencies, only python std lib
2. download

   git clone https://github.com/aploium/shootback
   

3. (optional) if you need a single-file slaver.py, run python3 build_singlefile_slaver.py
4. run these command
   

   # master listen :10000 for slaver, :10080 for you
   
   python3 master.py -m 0.0.0.0:10000 -c 127.0.0.1:10080
   
   
   
   # slaver connect to master, and use example.com as tunnel target
   
   # ps: you can use python2 in slaver, not only py3
   
   python3 slaver.py -m 127.0.0.1:10000 -t example.com:80
   
   
   
   # doing request to master
   
   curl -v -H "host: example.com" 127.0.0.1:10080
   
   # -- some HTML content from example.com --
   
   # -- some HTML content from example.com --
   
   # -- some HTML content from example.com --

    

5. a more realistic example:
   assume your master is 22.33.44.55 (just like the graph above)

   # slaver_local_ssh <---> slaver <--> master(22.33.44.55) <--> You
   
   
   
   # ---- master ----
   
   python3 master.py -m 0.0.0.0:10000 -c 0.0.0.0:10022
   
   
   
   # ---- slaver ----
   
   python(or python3) slaver.py -m 22.33.44.55:10000 -t 127.0.0.1:22
   
   
   
   # ---- YOU ----
   
   ssh 22.33.44.55 -p 10022
6. for more help, please see python3 master.py –help and python3 slaver.py –help

Tips

1. run in daemon:
   nohup python(or python3) slaver.py -m host:port -t host:port -q &
   or

   # screen is a linux command
   
   screen
   
   python(or python3) slaver.py -m host:port -t host:port
   
   # press  ctrl-a d  to detach screen
   
   # and if necessary, use "screen -r" to reattach
2. ANY service using TCP is shootback-able. HTTP/FTP/Proxy/SSH/VNC/…
3. shootback itself just do the transmission job, do not handle encrypt or proxy. However, you can use a 3rd party proxy (eg: shadowsocks) as slaver target.
   for example:

   shadowsocks_server<-->shootback_slaver<-->shootback_master<-->shadowsocks_client(socks5)

Source: https://github.com/aploium/