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parliament is an AWS IAM linting library. It reviews policies looking for problems such as:

  • malformed json
  • missing required elements
  • incorrect prefix and action names
  • incorrect resources or conditions for the actions provided
  • type mismatches
  • bad policy patterns

This library duplicates (and adds to!) much of the functionality in the web console page when reviewing IAM policies in the browser. We wanted that functionality as a library.

The IAM data is obtained from scraping the docs here and parsing this information with beautifulsoup using ./utils/update_iam_data.py.

Installation

pip install parliament

Usage

$ parliament --string '{"Version":"2012-10-17","Statement": {"Effect": "Allow","Action":["s3:GetObject"],"Resource": ["arn:aws:s3:::bucket1"]}}'
INVALID - No resources match for s3:GetObject which requires a resource format of arn:*:s3:::*/* for the resource object* - {'filepath': None}

This example is showing that a resource specifying an S3 bucket (not an object path) was given in a policy with s3:GetObject, which requires an object path.

See ./bin/parliament.py for further examples.

Development

Setup a testing environment

python3 -m venv ./venv && source venv/bin/activate
pip install boto3 jmespath pyyaml nose coverage

Run unit tests with:

./tests/scripts/unit_tests.sh

Run locally as:

bin/parliament