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Shell Deployment

This is a basic web server for automatically deploying binaries to a shell server, intended for pwn problems on CTFs. It is designed for Ubuntu 16.04, but may work on other distros with or without modification. It should be run as root. Since it should only be accessible by trusted users anyway, there is no assurance of security (you could probably mess stuff up if you wanted to).

Running

pipenv install
pipenv run sudo env SHELL_DEPLOY_SECRET=<authentication key> gunicorn deploy:app

Use

To deploy a binary, POST a tar archive file to /challenge with the Authorization header set to whatever you set SHELL_DEPLOY_SECRET to.

The archive must contain a config.yml. An example file can be seen below.

root: '/problems'
competition: '2019'
name: 'test'
files:
  - src: 'binary'
    dest: 'binary'
    mode: 2555
  - src: 'flag'
    dest: 'flag'
    mode: 440
  - src: 'source.c'
    dest: 'source.c'
    mode: 444
xinetd:
  port: 19010
  server: 'binary'

The binary will deployed at the path <root>/<competition>/<name>/. Files are copied from within the archive. For xinetd to work, you must have xinetd installed.