Are your Secrets Safe In Python?

Secrets and token stored as Python config or secrets file has a chance of being exposed via pyc files when commited to GitHub repository

On scrolling through Hackernews, I stumbled upon this article where Jesse points out how you or your organization can have secrets hidden in the form of pyc files.

While Jesse's code has scrolled through Github repos and intimated the code owners, there is a good chance that our private repo could have some hanging around.

I modified the code to scroll through Saama's private repositories. Gladly I didn't find any pyc files checked in.

You can use the same code to scroll through your private repositories.

Dependencies

pip install PyGithub
pip install uncompyle6

Code

If you want to jump ahead to the whole code checkout the Github repo

1. Import necessary packages

import base64
import io
import os
import tempfile
import uncompyle6
from github import Github

1. Authenticate with Github

Create a private access token and use it to authenticate yourself

GITHUB_KEY = <GITHUB_ACCESS_TOKEN>
g = Github(GITHUB_KEY)

1. Get all repos given an organization

repos  = g.get_organization(<ORGANIZATION>).get_repos(type="private")

1. Find files with *.pyc extension

for repo in repos:
    print (repo)
    try:
        contents = repo.get_contents("")
    except:
        continue
    for file_ in contents:
        try:
            extension = file_.name.split(".")[1]
        except IndexError:
            extension = None
        if file_.name in secrets or ( extension and extension  == "pyc"):
            items.append(file_)

1. If there are no pyc files, you are good to go

if not items:
    print ("No files found, you are good!")

1. If any pyc files might contain secrets decompile and print them out

for item in items:
    print(f"DECOMPILING REPO https://github.com/{item.repository.full_name}")
    print(f"OWNER TYPE: {item.repository.owner.type}")
    try:
        contents = base64.b64decode(item.content)
        with tempfile.NamedTemporaryFile(suffix=".pyc") as f:
            f.write(contents)
            f.seek(0)

            out = io.StringIO()
            uncompyle6.decompile_file(f.name, out)
            out.seek(0)
            print(out.read())
    except Exception as e:
        print(e)
        print(f"COULD NOT DECOMPILE REPO https://github.com/{item.repository.full_name}")
        continue
    print("\n\n\n")

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