django-safe-filefield

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Secure file field, which allows you to restrict uploaded file extensions. It may be useful for user-uploaded files (attachments).

This package adds model and forms field. What this fields does:

• restricts allowed file extensions (for example: only *.pdf files)
• checks file extensions is correct for sent content-type
• checks sent content type is correct for file content (detects by libmagic)
• checks uploaded file with anti-virus software

Installation

The package can be installed using:

.. code-block::

pip install django-safe-filefield

Add the following settings:

.. code-block:: python

INSTALLED_APPS += [ 'safe_filefield', ]

django-safe-filefield requires libmagic to be installed.

Usage

Simply add field to your model:

.. code-block:: python

from safe_filefield.models import SafeFileField

class MyModel(models.Model):

   attachment = SafeFileField(
       allowed_extensions=('xls', 'xlsx', 'csv')
   )

Or directly to your form:

.. code-block:: python

from safe_filefield.forms import SafeFileField

class MyForm(forms.Form):

   attachment = SafeFileField(
       allowed_extensions=('xls', 'xlsx', 'csv')
   )

Content type checking +++++++++++++++++++++

To check actual file content type, use check_content_type argument. This will prevent attacker from uploading malicious file just by changing its extension.

.. code-block:: python

class MyForm(forms.Form): attachment = SafeFileField( check_content_type=True )

ClamAV support ++++++++++++++

.. note:: To use this functionality you should have clamd daemon.

This package has ability to check uploaded file with ClamAV antivirus.

To use anti-virus protection simply enable it in your form or model definition:

.. code-block:: python

from safe_filefield.forms import SafeFileField

class MyForm(forms.Form): attachment = SafeFileField( scan_viruses=True, )

You can configure some ClamAV settings:

.. code-block:: python

CLAMAV_SOCKET = 'unix://tmp/clamav.sock' # or tcp://127.0.0.1:3310

CLAMAV_TIMEOUT = 30 # 30 seconds timeout, None by default which means infinite

Contributing

If you have any valuable contribution, suggestion or idea, please let me know as well because I will look into it.

Pull requests are welcome.