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SANS Holiday Hack Challenge Write-Ups

2021: write-up website
2020: write-up website
2019: write-up website or YouTube playlist
2018: PDF write-up

#!/usr/bin/env python3
"""SANS Holiday Hack Challenge 2021 - Bruteforce Frostavator."""
import asyncio
import itertools
import random
from typing import Optional, Tuple

import aiohttp
import click
import tqdm

GATES = ['AND', 'NAND', 'OR', 'NOR', 'XOR', 'XNOR']

def create_ascii_board(layout: list) -> str:
    """Create an ASCII panel layout."""
    g0 = f'{GATES[layout[0]]:^6}'
    g1 = f'{GATES[layout[1]]:^6}'
    g2 = f'{GATES[layout[2]]:^6}'
    g3 = f'{GATES[layout[3]]:^6}'
    g4 = f'{GATES[layout[4]]:^6}'
    g5 = f'{GATES[layout[5]]:^6}'

    return (
        'Logic board layout:\n\n'
        '  +------+   +------+   +------+\n'
        f'  |{g0}|   |{g1}|   |{g2}|\n'
        '  +------+   +------+   +------+\n'
        '  +------+   +------+   +------+\n'
        f'  |{g3}|   |{g4}|   |{g5}|\n'
        '  +------+   +------+   +------+'

async def fetch(
        session: aiohttp.ClientSession,
        perm: Tuple[int, ...]) -> Tuple[Optional[str], Tuple[int, ...]]:
    """Request the Frostavator to check a single permutation."""
    url = 'https://frostavator21.kringlecastle.com/check'
    headers = {'dataType': 'json', 'contentType': 'application/json'}
    data = {'id': 'abc-123', 'config': perm}

    async with session.post(url, headers=headers, json=data) as response:
        resp = await response.json()
        return resp.get('hash', None), perm

async def bruteforce(pick_one: bool):
    """Bruteforce the Frostavator."""
    async with aiohttp.ClientSession() as session:
        # Calculate all possible permutations for the 6 logic gates
        perms = itertools.permutations([0, 1, 2, 3, 4, 5])
        tasks = []

        # Send out a '/check' request for each permutation
        for perm in perms:
            tasks.append(asyncio.create_task(fetch(session, perm)))

        # Configure the progressbar
        bar_format = '{l_bar}{bar:30}| {n_fmt}/{total_fmt} [{elapsed}]'
        progressbar = tqdm.tqdm(
        results = []

        # Gather the results
        for step in progressbar:
            results.append(await step)

        # Filter out invalid values
        valids = [x[1] for x in results if x[0]]

        if pick_one:
            # Print one random entry
            winner = list(valids[random.randrange(0, len(valids))])
            print(f'frostavatorData: {winner}')
            # Print all entries
            print(f"All {len(valids)} valid 'frostavatorData' values:")

            for valid in valids:
                print(f'{list(valid)} or {[GATES[x] for x in valid]}')

@click.option('--pick-one', is_flag=True, help='Show a single solution.')
def cli(pick_one: bool):

if __name__ == '__main__':


Folks that throw dirt on you aren’t always trying to hurt you, and folks that pull you out of a jam aren’t always trying to help you. But the main point is when you’re up to your nose in shit, keep your mouth shut.

Jack Beauregard