django-x509

Reusable django app implementing x509 PKI certificates management

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django-x509

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Simple reusable django app implementing x509 PKI certificates management.

Want to help OpenWISP? Find out how to help us grow here <http://openwisp.io/docs/general/help-us.html>_.

.. image:: https://raw.githubusercontent.com/openwisp/openwisp2-docs/master/assets/design/openwisp-logo-black.svg :target: http://openwisp.org


.. contents:: Table of Contents: :backlinks: none :depth: 3


Current features

  • CA generation
  • Import existing CAs
  • End entity certificate generation
  • Import existing certificates
  • Certificate revocation
  • CRL view (public or protected)
  • Possibility to specify x509 extensions on each certificate
  • Random serial numbers based on uuid4 integers (see why is this a good idea <https://crypto.stackexchange.com/questions/257/unpredictability-of-x-509-serial-numbers>_)
  • Possibility to generate and import passphrase protected x509 certificates/CAs
  • Passphrase protected x509 content will be shown encrypted in the web UI

Project goals

  • provide a simple and reusable x509 PKI management django app
  • provide abstract models that can be imported and extended in larger django projects

Dependencies

  • Python >= 3.6
  • OpenSSL

Install stable version from pypi

Install from pypi:

.. code-block:: shell

pip install django-x509

Install development version

Install tarball:

.. code-block:: shell

pip install https://github.com/openwisp/django-x509/tarball/master

Alternatively you can install via pip using git:

.. code-block:: shell

pip install -e git+git://github.com/openwisp/django-x509#egg=django-x509

If you want to contribute, install your cloned fork:

.. code-block:: shell

git clone git@github.com:<your_fork>/django-x509.git
cd django-x509
python setup.py develop

Setup (integrate in an existing django project)

Add django_x509 to INSTALLED_APPS:

.. code-block:: python

INSTALLED_APPS = [
    # other apps
    'django_x509',
]

Add the URLs to your main urls.py:

.. code-block:: python

from django.contrib import admin

urlpatterns = [
    # ... other urls in your project ...

    url(r'admin/', admin.site.urls),
]

Then run:

.. code-block:: shell

./manage.py migrate

Installing for development

Install sqlite:

.. code-block:: shell

sudo apt-get install sqlite3 libsqlite3-dev

Install your forked repo:

.. code-block:: shell

git clone git://github.com/<your_fork>/django-x509
cd django-x509/
python setup.py develop

Install test requirements:

.. code-block:: shell

pip install -r requirements-test.txt

Create database:

.. code-block:: shell

cd tests/
./manage.py migrate
./manage.py createsuperuser

Launch development server:

.. code-block:: shell

./manage.py runserver

You can access the admin interface at http://127.0.0.1:8000/admin/.

Run tests with:

.. code-block:: shell

./runtests.py

Install and run on docker

Build from docker file:

.. code-block:: shell

sudo docker build -t openwisp/djangox509 .

Run the docker container:

.. code-block:: shell

sudo docker run -it -p 8000:8000 openwisp/djangox509

Settings

DJANGO_X509_DEFAULT_CERT_VALIDITY


+--------------+-------------+
| **type**:    | ``int``     |
+--------------+-------------+
| **default**: | ``365``     |
+--------------+-------------+

Default validity period (in days) when creating new x509 certificates.


``DJANGO_X509_DEFAULT_CA_VALIDITY``
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

+--------------+-------------+
| **type**:    | ``int``     |
+--------------+-------------+
| **default**: | ``3650``    |
+--------------+-------------+

Default validity period (in days) when creating new Certification Authorities.

``DJANGO_X509_DEFAULT_KEY_LENGTH``
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

+--------------+-------------+
| **type**:    | ``int``     |
+--------------+-------------+
| **default**: | ``2048``    |
+--------------+-------------+

Default key length for new CAs and new certificates.

Must be one of the following values:

* ``512``
* ``1024``
* ``2048``
* ``4096``

``DJANGO_X509_DEFAULT_DIGEST_ALGORITHM``

+--------------+-------------+ | type: | str | +--------------+-------------+ | default: | sha256 | +--------------+-------------+

Default digest algorithm for new CAs and new certificates.

Must be one of the following values:

  • sha1
  • sha224
  • sha256
  • sha384
  • sha512

DJANGO_X509_CA_BASIC_CONSTRAINTS_CRITICAL


+--------------+-----------+
| **type**:    | ``bool``  |
+--------------+-----------+
| **default**: | ``True``  |
+--------------+-----------+

Whether the ``basicConstraint`` x509 extension must be flagged as critical when creating new CAs.

``DJANGO_X509_CA_BASIC_CONSTRAINTS_PATHLEN``
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

+--------------+---------------------+
| **type**:    | ``int`` or ``None`` |
+--------------+---------------------+
| **default**: | ``0``               |
+--------------+---------------------+

Value of the ``pathLenConstraint`` of ``basicConstraint`` x509 extension used when creating new CAs.

When this value is a positive ``int`` it represents the maximum number of non-self-issued
intermediate certificates that may follow the generated certificate in a valid certification path.

Set this value to ``None`` to avoid imposing any limit.

``DJANGO_X509_CA_KEYUSAGE_CRITICAL``
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

+--------------+--------------------------+
| **type**:    | ``bool``                 |
+--------------+--------------------------+
| **default**: | ``True``                 |
+--------------+--------------------------+

Whether the ``keyUsage`` x509 extension should be flagged as "critical" for new CAs.

``DJANGO_X509_CA_KEYUSAGE_VALUE``
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

+--------------+--------------------------+
| **type**:    | ``str``                  |
+--------------+--------------------------+
| **default**: | ``cRLSign, keyCertSign`` |
+--------------+--------------------------+

Value of the ``keyUsage`` x509 extension for new CAs.

``DJANGO_X509_CERT_KEYUSAGE_CRITICAL``
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

+--------------+--------------------------+
| **type**:    | ``bool``                 |
+--------------+--------------------------+
| **default**: | ``False``                |
+--------------+--------------------------+

Whether the ``keyUsage`` x509 extension should be flagged as "critical" for new
end-entity certificates.

``DJANGO_X509_CERT_KEYUSAGE_VALUE``
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

+--------------+---------------------------------------+
| **type**:    | ``str``                               |
+--------------+---------------------------------------+
| **default**: | ``digitalSignature, keyEncipherment`` |
+--------------+---------------------------------------+

Value of the ``keyUsage`` x509 extension for new end-entity certificates.

``DJANGO_X509_CRL_PROTECTED``
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

+--------------+-----------+
| **type**:    | ``bool``  |
+--------------+-----------+
| **default**: | ``False`` |
+--------------+-----------+

Whether the view for downloading Certificate Revocation Lists should
be protected with authentication or not.

Extending django-x509
---------------------

One of the core values of the OpenWISP project is `Software Reusability <http://openwisp.io/docs/general/values.html#software-reusability-means-long-term-sustainability>`_,
for this reason *django-x509* provides a set of base classes
which can be imported, extended and reused to create derivative apps.

In order to implement your custom version of *django-x509*,
you need to perform the steps described in this section.

When in doubt, the code in the `test project <https://github.com/openwisp/django-x509/tree/master/tests/openwisp2/>`_
and the `sample app <https://github.com/openwisp/django-x509/tree/master/tests/openwisp2/sample_x509/>`_
will serve you as source of truth:
just replicate and adapt that code to get a basic derivative of
*django-x509* working.

**Premise**: if you plan on using a customized version of this module,
we suggest to start with it since the beginning, because migrating your data
from the default module to your extended version may be time consuming.

1. Initialize your custom module
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

The first thing you need to do is to create a new django app which will
contain your custom version of *django-x509*.

A django app is nothing more than a
`python package <https://docs.python.org/3/tutorial/modules.html#packages>`_
(a directory of python scripts), in the following examples we'll call this django app
``myx509``, but you can name it how you want::

    django-admin startapp myx509

Keep in mind that the command mentioned above must be called from a directory
which is available in your `PYTHON_PATH <https://docs.python.org/3/using/cmdline.html#envvar-PYTHONPATH>`_
so that you can then import the result into your project.

Now you need to add ``myx509`` to ``INSTALLED_APPS`` in your ``settings.py``,
ensuring also that ``django_x509`` has been removed:

.. code-block:: python

    INSTALLED_APPS = [
        # ... other apps ...
        # 'django_x509'  <-- comment out or delete this line
        'myx509'
    ]

For more information about how to work with django projects and django apps,
please refer to the `django documentation <https://docs.djangoproject.com/en/dev/intro/tutorial01/>`_.

2. Install ``django-x509`` & ``openwisp-utils``

Install (and add to the requirement of your project)::

pip install django-x509 openwisp-utils
  1. Add EXTENDED_APPS

Add the following to your ``settings.py``:

.. code-block:: python

    EXTENDED_APPS = ['django_x509']

4. Add ``openwisp_utils.staticfiles.DependencyFinder``

Add openwisp_utils.staticfiles.DependencyFinder to STATICFILES_FINDERS in your settings.py:

.. code-block:: python

STATICFILES_FINDERS = [
    'django.contrib.staticfiles.finders.FileSystemFinder',
    'django.contrib.staticfiles.finders.AppDirectoriesFinder',
    'openwisp_utils.staticfiles.DependencyFinder',
]
  1. Add openwisp_utils.loaders.DependencyLoader

Add ``openwisp_utils.loaders.DependencyLoader`` to ``TEMPLATES`` in your ``settings.py``:

.. code-block:: python

    TEMPLATES = [
        {
            'BACKEND': 'django.template.backends.django.DjangoTemplates',
            'OPTIONS': {
                'loaders': [
                    'django.template.loaders.filesystem.Loader',
                    'django.template.loaders.app_directories.Loader',
                    'openwisp_utils.loaders.DependencyLoader',
                ],
                'context_processors': [
                    'django.template.context_processors.debug',
                    'django.template.context_processors.request',
                    'django.contrib.auth.context_processors.auth',
                    'django.contrib.messages.context_processors.messages',
                ],
            },
        }
    ]

6. Inherit the AppConfig class
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Please refer to the following files in the sample app of the test project:

- `sample_x509/__init__.py <https://github.com/openwisp/django-x509/tree/master/tests/openwisp2/sample_x509/__init__.py>`_.
- `sample_x509/apps.py <https://github.com/openwisp/django-x509/tree/master/tests/openwisp2/sample_x509/apps.py>`_.

You have to replicate and adapt that code in your project.

For more information regarding the concept of ``AppConfig`` please refer to
the `"Applications" section in the django documentation <https://docs.djangoproject.com/en/dev/ref/applications/>`_.

7. Create your custom models
~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Here we provide an example of how to extend the base models of
*django-x509*. We added a simple "details" field to the
models for demostration of modification:

.. code-block:: python

    from django.db import models
    from django_x509.base.models import AbstractCa, AbstractCert

    class DetailsModel(models.Model):
        details = models.CharField(max_length=64, blank=True, null=True)

        class Meta:
            abstract = True

    class Ca(DetailsModel, AbstractCa):
        """
        Concrete Ca model
        """
        class Meta(AbstractCa.Meta):
            abstract = False

    class Cert(DetailsModel, AbstractCert):
        """
        Concrete Cert model
        """
        class Meta(AbstractCert.Meta):
            abstract = False

You can add fields in a similar way in your ``models.py`` file.

**Note**: for doubts regarding how to use, extend or develop models please refer to
the `"Models" section in the django documentation <https://docs.djangoproject.com/en/dev/topics/db/models/>`_.

8. Add swapper configurations
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Once you have created the models, add the following to your ``settings.py``:

.. code-block:: python

    # Setting models for swapper module
    DJANGO_X509_CA_MODEL = 'myx509.Ca'
    DJANGO_X509_CERT_MODEL = 'myx509.Cert'

Substitute ``myx509`` with the name you chose in step 1.

9. Create database migrations
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Create and apply database migrations::

    ./manage.py makemigrations
    ./manage.py migrate

For more information, refer to the
`"Migrations" section in the django documentation <https://docs.djangoproject.com/en/dev/topics/migrations/>`_.

10. Create the admin
~~~~~~~~~~~~~~~~~~~~

Refer to the `admin.py file of the sample app <https://github.com/openwisp/django-x509/tree/master/tests/openwisp2/sample_x509/admin.py>`_.

To introduce changes to the admin, you can do it in two main ways which are described below.

**Note**: for more information regarding how the django admin works, or how it can be customized,
please refer to `"The django admin site" section in the django documentation <https://docs.djangoproject.com/en/dev/ref/contrib/admin/>`_.

1. Monkey patching
##################

If the changes you need to add are relatively small, you can resort to monkey patching.

For example:

.. code-block:: python

    from django_x509.admin import CaAdmin, CertAdmin

    # CaAdmin.list_display.insert(1, 'my_custom_field') <-- your custom change example
    # CertAdmin.list_display.insert(1, 'my_custom_field') <-- your custom change example

2. Inheriting admin classes
###########################

If you need to introduce significant changes and/or you don't want to resort to
monkey patching, you can proceed as follows:

.. code-block:: python

    from django.contrib import admin
    from swapper import load_model

    from django_x509.base.admin import AbstractCaAdmin, AbstractCertAdmin

    Ca = load_model('django_x509', 'Ca')
    Cert = load_model('django_x509', 'Cert')

    class CertAdmin(AbstractCertAdmin):
        # add your changes here

    class CaAdmin(AbstractCaAdmin):
        # add your changes here

    admin.site.register(Ca, CaAdmin)
    admin.site.register(Cert, CertAdmin)

11. Create root URL configuration
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Please refer to the `urls.py <https://github.com/openwisp/django-x509/tree/master/tests/openwisp2/urls.py>`_
file in the test project.

For more information about URL configuration in django, please refer to the
`"URL dispatcher" section in the django documentation <https://docs.djangoproject.com/en/dev/topics/http/urls/>`_.

12. Import the automated tests
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

When developing a custom application based on this module, it's a good
idea to import and run the base tests too, so that you can be sure the changes
you're introducing are not breaking some of the existing features of *django-x509*.

In case you need to add breaking changes, you can overwrite the tests defined
in the base classes to test your own behavior.

.. code-block:: python

    from django.test import TestCase
    from django_x509.tests.base import TestX509Mixin
    from django_x509.tests.test_admin import ModelAdminTests as BaseModelAdminTests
    from django_x509.tests.test_ca import TestCa as BaseTestCa
    from django_x509.tests.test_cert import TestCert as BaseTestCert

    class ModelAdminTests(BaseModelAdminTests):
        app_label = 'myx509'

    class TestCert(BaseTestCert):
        pass

    class TestCa(BaseTestCa):
        pass

    del BaseModelAdminTests
    del BaseTestCa
    del BaseTestCert

Now, you can then run tests with::

    # the --parallel flag is optional
    ./manage.py test --parallel myx509

Substitute ``myx509`` with the name you chose in step 1.

For more information about automated tests in django, please refer to
`"Testing in Django" <https://docs.djangoproject.com/en/dev/topics/testing/>`_.

Contributing
------------

Please refer to the `OpenWISP contributing guidelines <http://openwisp.io/docs/developer/contributing.html>`_.

Support
-------

See `OpenWISP Support Channels <http://openwisp.org/support.html>`_.

Changelog
---------

See `CHANGES <https://github.com/openwisp/django-x509/blob/master/CHANGES.rst>`_.

License
-------

See `LICENSE <https://github.com/openwisp/django-x509/blob/master/LICENSE>`_.

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