django-xss-detection

django xss detection

This package contains a django template parser that can be used to find templates that contain variables that will not be escaped. This package currently has no knowledge of custom filters, custom tags, and python code (e.g. uses of mark safe). The code has only been tested against django versions >= 1.5 and <= 1.7.

Requirements

* django >= 1.5 and < 1.8
* lxml

Usage

This package can be used on the command line by running

python -m django_xss_detection.cli

How does it work?

The code works by monkey patching django template code and providing through a callback function to VariableNode that ends up referring to the CompileStringWrapper.handle_callback method. The callback function is used later when the code renders a given template and encounters a variable node that will not be escaped. The implementation of detecting unquoted variable nodes in element attributes and variable nodes in a javascript context lacking javascript escaping are not implemented through callbacks, see get_non_quoted_attr_vars_for_template and get_non_js_escaped_results_for_template in parse_template.py respectively.

Additionally, the code has modified versions of built in conditional tags, such as {% if %} and {% ifequal %}, so as to render all possible template code. If this package does not work on your custom template tags then you can add support for them similar to how waffle template tags are implemented (see templatetags/waffle.py and the patch method in util.py).