medeopolis / djangosaml2idp

SAML 2.0 Identity Provider in Django

djangosaml2idp

djangosaml2idp implements the Identity Provider side of the SAML2 protocol with Django. It builds on top of PySAML2, is compatible with Python 2/3 and all current supported Django versions.

This is a brand new package and I will develop it along with our (company) need for features. Any contributions, feature requests, proposals, ideas ... are welcome!

Installation

PySAML2 uses xmlsec1 binary to sign SAML assertions so you need to install it either through your operating system package or by compiling the source code. It doesn't matter where the final executable is installed because you will need to set the full path to it in the configuration stage. xmlsec is available (at least) for Debian, OSX and Alpine Linux.

Now you can install the djangosaml2idp package using pip. This will also install PySAML2 and its dependencies automatically:

pip install djangosaml2idp

Configuration & Usage

The first thing you need to do is add djangosaml2idp to the list of installed apps:

INSTALLED_APPS = (
    'django.contrib.admin',
    'djangosaml2idp',
    ...
)

Now include djangosaml2idp in your project by adding it in the url config:

from django.conf.urls import url, include
from django.contrib import admin

urlpatterns = [
    url(r'^idp/', include('djangosaml2idp.urls')),
    url(r'^admin/', admin.site.urls),
    ...
]

In your Django settings, configure your IdP. Configuration follows the pysaml2_configuration. The IdP from the example project looks like this:

...
import saml2
from saml2.saml import NAMEID_FORMAT_EMAILADDRESS, NAMEID_FORMAT_UNSPECIFIED
from saml2.sigver import get_xmlsec_binary

LOGIN_URL = '/login/'
BASE_URL = 'http://localhost:9000/idp'

SAML_IDP_CONFIG = {
    'debug' : DEBUG,
    'xmlsec_binary': get_xmlsec_binary(['/opt/local/bin', '/usr/bin/xmlsec1']),
    'entityid': '%s/metadata' % BASE_URL,
    'description': 'Example IdP setup',

    'service': {
        'idp': {
            'name': 'Django localhost IdP',
            'endpoints': {
                'single_sign_on_service': [
                    ('%s/sso/post' % BASE_URL, saml2.BINDING_HTTP_POST),
                    ('%s/sso/redirect' % BASE_URL, saml2.BINDING_HTTP_REDIRECT),
                ],
            },
            'name_id_format': [NAMEID_FORMAT_EMAILADDRESS, NAMEID_FORMAT_UNSPECIFIED],
            'sign_response': True,
            'sign_assertion': True,
        },
    },

    'metadata': {
        'local': [os.path.join(os.path.join(os.path.join(BASE_DIR, 'idp'), 'saml2_config'), 'sp_metadata.xml')],
    },
    # Signing
    'key_file': BASE_DIR + '/certificates/private_key.pem',
    'cert_file': BASE_DIR + '/certificates/public_key.pem',
    # Encryption
    'encryption_keypairs': [{
        'key_file': BASE_DIR + '/certificates/private_key.pem',
        'cert_file': BASE_DIR + '/certificates/public_key.pem',
    }],
    'valid_for': 365 * 24,
}

You also have to define a mapping for each SP you talk to:

SAML_IDP_SPCONFIG = {
    'http://localhost:8000/saml2/metadata/': {
        'processor': 'djangosaml2idp.processors.BaseProcessor',
        'attribute_mapping': {
            # DJANGO: SAML
            'email': 'email',
            'first_name': 'first_name',
            'last_name': 'last_name',
            'is_staff': 'is_staff',
            'is_superuser':  'is_superuser',
        }
    }
}

That's all for the IdP configuration. Assuming you run the Django development server on localhost:8000, you can get its metadata by visiting http://localhost:8000/idp/metadata/. Use this metadata xml to configure your SP. Place the metadata xml from that SP in the location specified in the config dict (sp_metadata.xml in the example above).

Example project

example_project contains a barebone demo setup. It consists of a Service Provider implemented with djangosaml2 and an Identity Provider using djangosaml2idp.