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PHP-TUF

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IMPORTANT

PHP-TUF is in a pre-release state and is not considered a complete or secure version of the TUF framework. It should currently only be used for testing, development and feedback.

Do not use in production for secure target downloads!!

PHP-TUF is a PHP implementation of The Update Framework (TUF) to provide signing and verification for secure PHP application updates. Read the TUF specification for more information on how TUF is intended to work and the security it provides.

PHP-TUF project development is primarily focused on supporting secure automated updates for PHP CMSes, although it should also work for any PHP application or Composer project. Contributing projects:

PHP-TUF client requirements

The PHP-TUF client is designed to provide TUF verification to PHP applications for target signatures.

  • Minimum required PHP version: 7.2
  • Requires ext-json
  • The paragonie/sodium_compat dependency provides a polyfill for the Sodium cryptography library; however, installing ext-sodium is recommended for better performance and security.

PHP-TUF development requirements

We recommend using the default CLI implementation (a Python application) to generate keys and signatures as a part of your project's release creation process. This will require:

  • Python 3.9+
  • PIP 19+

@todo More detailed instructions. #170

Server environment setup for the Python TUF CLI

  1. Install OS-level dependencies:

    • On Fedora 33:

      sudo dnf install pipenv python3-devel libffi-devel
      
    • On Ubuntu 20.10:

      sudo apt-get install pipenv python3-dev libffi-dev
      
  2. Configure the virtual environment:

    pipenv --three install
    
  3. Launch a shell within the virtual environment:

    pipenv shell
    

Code style

The code generally follows PSR-2 with some additional formatting rules for code documentation and array formatting. Run PHPCS to check for code style compliance:

 composer phpcs

Testing

Test fixtures generation

  1. Install the Python TUF implementation and enable the pipenv:

    pipenv install
    pipenv shell
    
  2. Initialize the repository and add/sign a target:

    python generate_fixtures.py
    
  3. Fixtures should appear in fixtures/.

Running the PHP-TUF tests

  1. Ensure you have all required dependencies by running composer install.
  2. Run composer test at the project's root.

Leveraging test fixtures directly

  1. From fixtures/*/tufrepo:

    python3 -m http.server 8001
    
  2. From fixtures/*/tufclient:

    mkdir -p tuftargets
    curl http://localhost:8001/targets/testtarget.txt > tuftargets/testtarget.txt
    client.py --repo http://localhost:8001 testtarget.txt
    # A 404 is expected for N.root.json unless a key has been rotated.
    

Dependency policies and information

To provide a lightweight, reliable, and secure client, external dependencies are carefully limited. Any proposed dependency additions (and those dependencies' dependencies) should undergo the Drupal core dependency evaluation process.

For evaluations and policies of current dependencies, see the PHP-TUF dependency information.

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