Django-CSP-Nonce (beta)
DCN is a Content-Security-Policy nonce injection support system for Django and CSP.
It provides for on-the-fly nonce creation and deployment. Once
installed, DCN will generate a unique nonce
for each request (one for
script-src and a separate one for
style-src directives) append the nonce to theCSP header, then make the nonce(s) accessible to the templates via the
Django Context Processors.
DCN stays out of the way of Django-CSP and can operate
independently with any method of CSP insertion that passes through
Django Middleware.
Disclosure
- This code has not been through a third party security audit.
- I’ve successfully tested this locally with
pypy-5.4.1. TravisCI has confirmed this doesn’t work with their version.
Installation
pip install django-csp-nonce
Add DCN to MIDDLEWARE_CLASSES:
MIDDLEWARE_CLASSES = (
[ ... ]
'csp_nonce.middleware.CSPNonceMiddleware',
# Make sure you put it *above* django-csp if you're using it
[ ... ]
)Add DCN to context_processors:
TEMPLATES = [
{
'BACKEND': 'django.template.backends.django.DjangoTemplates',
'DIRS': [...],
'APP_DIRS': True,
'OPTIONS': {
'context_processors': [
'csp_nonce.context_processors.nonce',
[ ... ]
],
},
},
]Finally, add DCN directives to settings:
CSP_NONCE_SCRIPT = False # True if you want to use it
CSP_NONCE_STYLE = False # True if you want to use it
CSP_FLAG_STRICT = False # True to include strict-dynamic in CSPUsage
DCN takes care of nonce generation for you. As you work on your templates, pull in your specific nonce from the context:
<script type="text/javascript" {{ script_nonce }}>
...
</script>
<style {{ style_nonce }}>
...
</style>Dependencies
- Django
Known issues
- Nonce sync breaks on
settings.DEBUG=True
Important Changes
- 1.0
- Out of beta!
- PyNacl is no longer a dependency. (Moving forward the aim is to stay compatible with environments such as Google App Engine which don't support non-python extensions.)
Running Tests
Use tox to run the tests against multiple versions of Python that
you have installed and multiple versions of Django. Please make sure
that you run your tests against at least Python 2.7 and Python 3.5.
virtualenv venv
. ./venv/bin/activate
pip install tox
tox
