117 lines
5.5 KiB
Markdown
117 lines
5.5 KiB
Markdown
<p align="center">
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<img src="docs/images/widevine_icon_24.png"> <a href="https://github.com/rlaphoenix/pywidevine">pywidevine</a>
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<br/>
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<sup><em>Python Widevine CDM implementation.</em></sup>
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</p>
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<p align="center">
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<a href="https://github.com/rlaphoenix/pywidevine/actions/workflows/ci.yml">
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<img src="https://github.com/rlaphoenix/pywidevine/actions/workflows/ci.yml/badge.svg" alt="Build status">
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</a>
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<a href="https://pypi.org/project/pywidevine">
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<img src="https://img.shields.io/badge/python-3.7%2B-informational" alt="Python version">
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</a>
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<a href="https://deepsource.io/gh/rlaphoenix/pywidevine">
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<img src="https://deepsource.io/gh/rlaphoenix/pywidevine.svg/?label=active+issues" alt="DeepSource">
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</a>
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</p>
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## Features
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- 🛡️ Security-first approach; All user input has Signatures verified
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- 👥 Remotely accessible Server/Client CDM code
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- 📦 Supports parsing and serialization of WVD (v2) provisions
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- 🛠️ Class for creation, parsing, and conversion of PSSH data
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- 🧩 Plug-and-play installation via PIP/PyPI
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- 🗃️ YAML configuration files
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- ❤️ Forever FOSS!
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## Installation
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*Note: Requires [Python] 3.7.0 or newer with PIP installed.*
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```shell
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$ pip install pywidevine
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```
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You now have the `pywidevine` package installed and a `pywidevine` executable is now available.
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Check it out with `pywidevine --help` - Voilà 🎉!
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### From Source Code
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The following steps are instructions on download, preparing, and running the code under a Poetry environment.
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You can skip steps 3-5 with a simple `pip install .` call instead, but you miss out on a wide array of benefits.
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1. `git clone https://github.com/rlaphoenix/pywidevine`
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2. `cd pywidevine`
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3. (optional) `poetry config virtualenvs.in-project true`
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4. `poetry install`
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5. `poetry run pywidevine --help`
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As seen in Step 5, running the `pywidevine` executable is somewhat different to a normal PIP installation.
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See [Poetry's Docs] on various ways of making calls under the virtual-environment.
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[Python]: <https://python.org>
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[Poetry]: <https://python-poetry.org>
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[Poetry's Docs]: <https://python-poetry.org/docs/basic-usage/#using-your-virtual-environment>
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## Troubleshooting
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### Executable `pywidevine` was not found
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Make sure the Python installation's Scripts directory is added to your Path Environment Variable.
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If this happened under a Poetry environment, make sure you use the appropriate Poetry-specific way of calling
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the executable. You may make this executable available globally by adding the .venv's Scripts folder to your
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Path Environment Variable.
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## Disclaimer
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1. This project requires a valid Google-provisioned Private Key and Client Identification blob which are not
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provided by this project.
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2. Public test provisions are available and provided by Google to use for testing projects such as this one.
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3. License Servers have the ability to block requests from any provision, and are likely already blocking test
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provisions on production endpoints.
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4. This project does not condone piracy or any action against the terms of the DRM systems.
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5. All efforts in this project have been the result of Reverse-Engineering, Publicly available research, and Trial
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& Error.
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## Key and Output Security
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*Licenses, Content Keys, and Decrypted Data is not secure in this CDM implementation.*
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The Content Decryption Module is meant to do all downloading, decrypting, and decoding of content, not just license
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acquisition. This Python implementation only does License Acquisition within the CDM.
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The section of which a 'Decrypt Frame' call is made would be more of a 'Decrypt File' in this implementation. Just
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returning the original file in plain text defeats the point of the DRM. Even if 'Decrypt File' was somehow secure, the
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Content Keys used to decrypt the files are already exposed to the caller anyway, allowing them to manually decrypt.
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An attack on a 'Decrypt Frame' system would be analogous to doing an HDMI capture or similar attack. This is because it
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would require re-encoding the video by splicing each individual frame with the right frame-rate, syncing to audio, and
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more.
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While a 'Decrypt Video' system would be analogous to downloading a Video and passing it through a script. Not much of
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an attack if at all. The only protection against a system like this would be monitoring the provision and acquisitions
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of licenses and prevent them. This can be done by revoking the device provision, or the user or their authorization to
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the service.
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There isn't any immediate way to secure either Key or Decrypted information within a Python environment that is not
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Hardware backed. Even if obfuscation or some other form of Security by Obscurity was used, this is a Software-based
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Content Protection Module (in Python no less) with no hardware backed security. It would be incredibly trivial to break
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any sort of protection against retrieving the original video data.
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Though, it's not impossible. Google's Chrome Browser CDM is a simple library extension file programmed in C++ that has
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been improving its security using math and obscurity for years. It's getting harder and harder to break with its latest
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versions only being beaten by Brute-force style methods. However, they have a huge team of very skilled workers, and
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making a CDM in C++ has immediate security benefits and a lot of methods to obscure and obfuscate the code.
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## Credit
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- Widevine Icon © Google.
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- The awesome community for their shared research and insight into the Widevine Protocol and Key Derivation.
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## License
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[GNU General Public License, Version 3.0](LICENSE)
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