lents_adutils 0.3.0

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Utils for Attack&Defense CTFs

Little package containing useful classes for Attack&Defense CTFs.

Purpose

During my first A&D based CTFs, my workflow was:

1. Building the exploit.py script.
2. Copy-pasting an exploit.sh script, whose only job was to spin up multiple python exploit.py, each targetting a different vulnbox.
3. Run a submit_flags.py to collect the points.

At first it was great, but then things got complicated, and the exploit.sh reached ~100-line length for something that in Python needs half.

Plus, I don't want multiple copies of the same files scattered across my filesystem. I just want to pip install <x> in my venv.

Here it comes adutils!

Installation

You can install it via:

pip install lents_adutils

Usage

When writing an exploit for an A&D CTF, you want to run the same exploit towards multiple vulnboxes at the same time. The Exploit class lets you do exactly that by extending it.

from adutils import Exploit

class MyExploit(Exploit):
# ...

Then you have to implement the run(self, ip: str) method, which gives you access to the IP address of one of the vulnbox you're targeting.

    def run(self, ip: str):
        flag = exploit() # imagine you get the flag via exploit()
        self.flagout(flag) # you add the flag to a list of flags

At the end of each cycle, the submit_flags method will be run for you.

If you want to run the full exploit, you create an instance of MyExploit and then call the start method.

if __name__ == "main":
    port = 1234
    team_token = "deadbeef"
    my_exploit = MyExploit(port, team_token)

    my_exploit.start()

There are lots of options that allow you to fully customize the workflow. You can also override the existing methods to meet your needs.

# The Exploit initializer
def __init__(
    self,
    port: int,
    team_token: str,
    n_teams: int = 80,                                   # number of teams
    sleep_interval: int = 60,                            # time between cycles
    ignore: list[int] = [],                              # list of team ids to ignore
    verbose: bool = True,                                # additional logs
    submit_url: str = "http://10.10.0.1/flags",          # endpoint to submit flags
    submit_timeout: int = 5,
    flag_ids_url: str = "http://10.10.0.1:8081/flagIds", # endpoint that exposes info for challenges
    flag_regex: Pattern = compile(r"^[A-Z0-9]{31}=$")
):