Extra mitigation against the BREACH attack for Django projects.
Note (that as of version 4.2 Django) includes this protection natively and this library is not needed.
django-debreach provides additional protection to Django's built in CSRF token masking by randomising the content length of each response. This is achieved by adding a random string of between 12 and 25 characters as a comment to the end of the HTML content. Note that this will only be applied to responses with a content type of text/html.
When combined with the built-in mitigations in Django and rate limiting (either in your web-server, or by using something like django-ratelimit), the techniques here should provide a fairly comprehensive protection against the BREACH attack.
Install from PyPI using:
$ pip install django-debreach
To enable content length modification for all responses, add the debreach.middleware.RandomCommentMiddleware to the start of your middleware, but after the GzipMiddleware if you are using that.:
MIDDLEWARE_CLASSES = (
'debreach.middleware.RandomCommentMiddleware',
...
)
or:
MIDDLEWARE_CLASSES = (
'django.middleware.gzip.GzipMiddleware',
'debreach.middleware.RandomCommentMiddleware',
...
)
If you wish to disable this feature for selected views, simply apply the debreach.decorators.random_comment_exempt decorator to the view.
If you only want to protect a subset of views with content length modification then it may be easier to not use the middleware, but to selectively apply the debreach.decorators.append_random_comment decorator to the views you want protected.
Version 2.0.0 drops all support for Python 2 and Django < 2.0. If you need support for those versions continue using django-debreach>=1.5.2,<2.0.
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