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This project is no longer maintained

March 2020 Update: Please go see the amazing Pysa tutorial_ that should get you up to speed finding security vulnerabilities in your Python codebase.

Pyre_ from Facebook is an amazing project that has a bright future and many smart people working on it. I would suggest, if you don't know that much about program analysis, that you understand how PyT works before diving into Pyre. Along with the README's in most directories, there are the original Master's Thesis and some slides_. With that said, I am happy to review pull requests and give you write permissions if you make more than a few.

There were a lot of great contributors to this project, I plan on working on other projects like detect-secrets_ and others (e.g. Pyre eventually) in the future if you'd like to work together more :)

If you are a security engineer with e.g. a Python codebase without type annotations, that Pyre won't handle, I would suggest you replace your sinks with a secure wrapper (something like defusedxml), and alert off any uses of the standard sink. You can use Bandit to do this since dataflow analysis is not required, but you will have to trim it a lot, due to the high false-positive rate.

.. _Pysa tutorial: https://github.com/facebook/pyre-check/tree/master/pysa_tutorial#pysa-tutorial .. _Pyre: https://github.com/facebook/pyre-check .. _README's in most directories: https://github.com/python-security/pyt/tree/master/pyt#how-it-works .. _Master's Thesis: https://projekter.aau.dk/projekter/files/239563289/final.pdf .. _some slides: https://docs.google.com/presentation/d/1JfAykAxR0DcJwwGfHmhrz1RhhKqYsnt5x_GY8CbTp7s .. _detect-secrets: https://github.com/Yelp/detect-secrets/blob/master/CHANGELOG.md#whats-new .. _defusedxml: https://pypi.org/project/defusedxml/ .. _Bandit: https://github.com/PyCQA/bandit

Python Taint

Static analysis of Python web applications based on theoretical foundations (Control flow graphs, fixed point, dataflow analysis)

Features

• Detect command injection, SSRF, SQL injection, XSS, directory traveral etc.

• A lot of customisation possible

For a look at recent changes, please see the changelog_.

.. _changelog: https://github.com/python-security/pyt/blob/master/CHANGELOG.md

Example usage and output:

.. image:: https://raw.githubusercontent.com/KevinHock/rtdpyt/master/readme_static_files/pyt_example.png

Install

Before continuing, make sure you have python3.6 or 3.7 installed.

.. code-block:: python

pip install python-taint
✨🍰✨

PyT can also be installed from source. To do so, clone the repo, and then run:

.. code-block:: python

python3 setup.py install

How it Works

Soon you will find a README.rst_ in every directory in the pyt/ folder, start here_.

.. _README.rst: https://github.com/python-security/pyt/tree/master/pyt .. _start here: https://github.com/python-security/pyt/tree/master/pyt

How to Use

1. Choose a web framework

The -a option determines which functions will have their arguments tainted_, by default it is Flask.

2. (optional) Customize source and sink information

Use the -t option to specify sources and sinks, by default this file is used_.

3. (optional) Customize which library functions propagate taint

For functions from builtins or libraries, e.g. url_for or os.path.join, use the -m option to specify whether or not they return tainted values given tainted inputs, by default this file is used_.

.. _The -a option determines which functions will have their arguments tainted: https://github.com/python-security/pyt/tree/master/pyt/web_frameworks#web-frameworks .. _this file is used: https://github.com/python-security/pyt/blob/master/pyt/vulnerability_definitions/all_trigger_words.pyt .. _default this file is used: https://github.com/python-security/pyt/blob/master/pyt/vulnerability_definitions/blackbox_mapping.json

Usage

.. code-block::

usage: python -m pyt [-h] [-a ADAPTOR] [-pr PROJECT_ROOT] [-b BASELINE_JSON_FILE] [-j] [-t TRIGGER_WORD_FILE] [-m BLACKBOX_MAPPING_FILE] [-i] [-o OUTPUT_FILE] [--ignore-nosec] [-r] [-x EXCLUDED_PATHS] [--dont-prepend-root] [--no-local-imports] targets [targets ...]

required arguments: targets source file(s) or directory(s) to be scanned

important optional arguments: -a ADAPTOR, --adaptor ADAPTOR Choose a web framework adaptor: Flask(Default), Django, Every or Pylons

-t TRIGGER_WORD_FILE, --trigger-word-file TRIGGER_WORD_FILE
                      Input file with a list of sources and sinks

-m BLACKBOX_MAPPING_FILE, --blackbox-mapping-file BLACKBOX_MAPPING_FILE
                          Input blackbox mapping file

optional arguments: -pr PROJECT_ROOT, --project-root PROJECT_ROOT Add project root, only important when the entry file is not at the root of the project.

-b BASELINE_JSON_FILE, --baseline BASELINE_JSON_FILE
                      Path of a baseline report to compare against (only
                      JSON-formatted files are accepted)

-j, --json            Prints JSON instead of report.

-i, --interactive     Will ask you about each blackbox function call in
                      vulnerability chains.

-o OUTPUT_FILE, --output OUTPUT_FILE
                      Write report to filename

--ignore-nosec        Do not skip lines with # nosec comments

-r, --recursive       Find and process files in subdirectories

-x EXCLUDED_PATHS, --exclude EXCLUDED_PATHS
                      Separate files with commas

--dont-prepend-root   In project root e.g. /app, imports are not prepended
                      with app.*

--no-local-imports    If set, absolute imports must be relative to the
                      project root. If not set, modules in the same
                      directory can be imported just by their names.

Usage from Source

Using it like a user python3 -m pyt examples/vulnerable_code/XSS_call.py

Running the tests python3 -m tests

Running an individual test file python3 -m unittest tests.import_test

Running an individual test python3 -m unittest tests.import_test.ImportTest.test_import

Contributions

Join our slack group: https://pyt-dev.slack.com/ - ask for invite: [email protected]

Guidelines_

.. _Guidelines: https://github.com/python-security/pyt/blob/master/CONTRIBUTIONS.md

Virtual env setup guide

Create a directory to hold the virtual env and project

mkdir ~/a_folder

cd ~/a_folder

Clone the project into the directory

git clone https://github.com/python-security/pyt.git

Create the virtual environment

python3 -m venv ~/a_folder/

Check that you have the right versions

python3 --version sample output Python 3.6.0

pip --version sample output pip 9.0.1 from /Users/kevinhock/a_folder/lib/python3.6/site-packages (python 3.6)

Change to project directory

cd pyt

In the future, just type source ~/a_folder/bin/activate to start developing.