Trello Watchman

Monitoring your Trello boards for sensitive information

About Trello Watchman

Trello Watchman is an application that uses the Trello API to look for potentially sensitive data exposed in your public Trello boards.

Features

Trello Watchman looks for:

API Keys, Tokens & Service Accounts
- AWS, Azure, GCP, Google API, Slack (keys & webhooks), Twitter, Facebook, GitHub
- Generic Private keys
- Access Tokens, Bearer Tokens, Client Secrets, Private Tokens
Files
- Certificate files
- Potentially interesting/malicious/sensitive files (.docm, .xlsm, .zip etc.)
- Executable files
Personal Data
- Leaked passwords
- Passport numbers, Dates of birth, Social security numbers, National insurance numbers, Drivers licence numbers (UK), Individual Taxpayer Identification Number

Time based searching

You can run Trello Watchman to look for results going back as far as:

24 hours
7 days
30 days
All time

This means after one deep scan, you can schedule Trello Watchman to run regularly and only return results from your chosen timeframe.

Rules

Trello Watchman uses custom YAML rules to detect matches in Trello.

They follow this format:

---
filename:
enabled: [true|false]
meta:
  name:
  author:
  date:
  description: #what the search should find
  severity: #rating out of 100
scope:
- #[text|attachments]
test_cases:
  match_cases:
  - #test case that should match the regex*
  fail_cases:
  - #test case that should not match the regex*
strings:
- #search query to use in Trello*
pattern: #Regex pattern to filter out false positives*

There are Python tests to ensure rules are formatted properly and that the Regex patterns work in the tests dir

More information about rules, and how you can add your own, is in the file docs/rules.md.

Logging

Trello Watchman gives the following logging options:

Stdout
Log file
TCP stream

Results are output in JSON format, perfect for ingesting into a SIEM or other log analysis platform.

For file and TCP stream logging, configuration options need to be passed via .conf file or environment variable. See the file docs/logging.md for instructions on how to set it up.

If no logging option is given, Trello Watchman defaults to Stdout logging.

Requirements

Trello API token

To run Trello Watchman, you will need a Trello API OAuth access token, which take the form of a key and a secret. You can generate these here.

Note: User tokens act on behalf of the user who generates them, so I would suggest you create this app and authorise it using a service account, otherwise the app will have access to your private Trello boards.

Providing token

Trello Watchman will first try to get the secret and key from the environment variables TRELLO_WATCHMAN_SECRET and TRELLO_WATCHMAN_KEY, if this fails it will load the token from .conf file (see below).

.conf file

Configuration options can be passed in a file named watchman.conf which must be stored in your home directory. The file should follow the YAML format, and should look like below:

trello_watchman:
  secret: abc123
  key: abc123
  logging:
    file_logging:
      path: /var/log/
    json_tcp:
      host: localhost
      port: 9020

Trello Watchman will look for this file at runtime, and use the configuration options from here. If you are not using the advanced logging features, leave them blank.

If you are having issues with your .conf file, run it through a YAML linter.

An example file is in docs/example.conf

Installation

Install via pip

python3 -m pip install trello-watchman

Usage

Trello Watchman will be installed as a global command, use as follows:

usage: trello-watchman [-h] --timeframe {d,w,m,a} [--output {file,stdout,stream}]
                   [--version] [--all] [--attachments] [--text]

Monitoring your Trello boards for sensitive information

optional arguments:
  -h, --help            show this help message and exit
  --version             show program's version number and exit
  --all                 Find everything
  --attachments         Search for attachments
  --text                Search text

required arguments:
  --timeframe {d,w,m,a}
                        How far back to search: d = 24 hours w = 7 days, m =
                        30 days, a = all time
  --output {file,stdout,stream}
                        Where to send results

You can run Trello Watchman to look for everything, and output to default CSV:

trello-watchman --timeframe a --all

Other Watchman apps

You may be interested in some of the other apps in the Watchman family:

License

The source code for this project is released under the GNU General Public Licence. This project is not associated with Trello or Atlassian.

PaperMtn/trello-watchman