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Description:

python3samldjango 1.3.0

Django SAML Toolkit
Quickly and easily add SAML Single Sign-On to your Django projects.
This package is designed to be very simple for initial setup while also being easily customizable to meet all of your needs.
Installation
Dependencies (Linux)
The package xmlsec1 is required for this to work.
Debian / Ubuntu:
sudo apt-get install libxml2-dev libxmlsec1-dev libxmlsec1-openssl
Red Hat / CentOs:
sudo yum install libxml2-devel xmlsec1-devel xmlsec1-openssl-devel libtool-ltdl-devel
Dependencies (Windows)
The python-xmlsec package on Windows is having some issues with hosting, so you can install it manually here:
pip install https://github.com/mehcode/python-xmlsec/releases/download/1.3.5/xmlsec-1.3.52.dev0-cp36-cp36m-win_amd64.whl
For more information here is the related issue.
Pip
pip install python3-saml-django
Django
Note: Django 1.11 support was dropped in 1.2.0. If you need Django 1.11 support, please use version 1.1.4. Django 2.x support was dropped in 1.3.0. If you need Django 2.x support, please use version 1.2.2.
settings.py
INSTALLED_APPS = [
...,
'django_saml'
]

AUTHENTICATION_BACKENDS = [
'django_saml.backends.SamlUserBackend',
...
]

urls.py
urlpatterns = [
path('saml/', include('django_saml.urls')),
...
]

Configuration
Required Settings
SP Information
You must provide information about your site to be published as metadata.
SAML_SP = {
"entityId": "https://<your_site>/saml/metadata/",
"assertionConsumerService": {
"url": "https://<your_site>/saml/acs/",
# DO NOT CHANGE THIS
"binding": "urn:oasis:names:tc:SAML:2.0:bindings:HTTP-POST"
},
"singleLogoutService": {
"url": "https://<your_site>/saml/sls/",
# DO NOT CHANGE THIS
"binding": "urn:oasis:names:tc:SAML:2.0:bindings:HTTP-Redirect"
},
"NameIDFormat": "urn:oasis:names:tc:SAML:2.0:nameid-format:unspecified",
"x509cert": "<can also be loaded by file, see SAML_BASE_DIRECTORY>",
"privateKey": "<can also be loaded by file, see SAML_BASE_DIRECTORY>"
}

IdP Information
You must provide information about the IdP you will be using through one of the following means:
SAML_IDP = {
"entityId": "https://example.com/saml/metadata/",
"singleSignOnService": {
"url": "https://example.com/trust/saml2/http-post/sso/",
"binding": "urn:oasis:names:tc:SAML:2.0:bindings:HTTP-Redirect"
},
"singleLogoutService": {
"url": "https://example.com/trust/saml2/http-redirect/slo/",
"binding": "urn:oasis:names:tc:SAML:2.0:bindings:HTTP-Redirect"
},
"x509cert": "<cert here>"
}
SAML_IDP_FILE = os.path.join(BASE_DIR, 'idp_meta.xml')
SAML_IDP_URL = 'https://example.com/saml/metadata/'

Optional Settings

Setting
Description
Default
Example

SAML_STRICT
Incorrect SAML responses should be rejected. Should be True in production.
True

SAML_DEBUG
SAML warnings are displayed
False

SAML_CREATE_USER
New users are created on login if they don't exist
True

SAML_UPDATE_USER
Existing users are updated with information from SAML on login
False

SAML_IDP_METADATA_TIMEOUT
If using SAML_IDP_URL, the result will be cached for this many seconds before checking again.
3600

SAML_SECURITY
Advanced security settings
See below
See below

SAML_CONTACT
Contact information for site maintainers
None
See below

SAML_ORGANIZATION
Organization information
None
See below

SAML_LOGIN_REDIRECT
Path to redirect users after a successful login
'/'

SAML_LOGOUT_REDIRECT
Path to redirect users after a successful logout
'/logged-out'

SAML_NO_USER_REDIRECT
Path to redirect users if SAML_CREATE_USER = False and the user doesn't exist
None (Raises PermissionDenied)
'/permission-error'

SAML_USERNAME_ATTR
SAML attribute to use to look up users (name, not friendly name)
'uid'
'email'

SAML_ATTR_MAP
List of 2-tuples to map SAML attributes to Django user attributes (indexed by name, not friendly name)
[]
[('givenName', 'first_name')]

SAML_ATTR_DEFAULTS
Dictionary of default values to use if an attribute is not present in the SAML response. If no default exists, then a MissingAttributeException will be thrown.
{}
{'first_name': ''}

SAML_ATTR_UPDATE_IGNORE
List of Django user attributes to only set on first login, and ignore in future logins (only used if SAML_UPDATE_USER is True)
[]
[('email', 'first_name')]

SAML_BASE_DIRECTORY
File path to load SP certificates. Must contain a 'certs' folder with 'sp.key' and 'sp.crt' inside.
None
os.path.join(BASE_DIR, 'saml')

SAML_DESTINATION_HOST
Static value to compare with the SAML Destination attribute instead of reading from the request. Useful for load balancers.
None
'example.com'

SAML_DESTINATION_HTTPS
Companion for SAML_DESTINATION_HOST. Set to True if the destination will be over HTTPS but the final request will not be.
None
True

SAML_DESTINATION_PORT
Companion for SAML_DESTINATION_HOST. Set to a STRING of a number if you use a non-standard port that does not match SAML_DESTINATION_HTTPS.
None
'8080'

SAML_SECURITY Default and Example
SAML_SECURITY = {
"nameIdEncrypted": False,
"authnRequestsSigned": False,
"logoutRequestSigned": False,
"logoutResponseSigned": False,
"signMetadata": False,
"wantMessagesSigned": False,
"wantAssertionsSigned": False,
"wantNameId": True,
"wantNameIdEncrypted": False,
"wantAssertionsEncrypted": False,
"signatureAlgorithm": "http://www.w3.org/2000/09/xmldsig#rsa-sha1",
"digestAlgorithm": "http://www.w3.org/2000/09/xmldsig#sha1"
}

SAML_CONTACT Example
SAML_CONTACT = {
"technical": {
"givenName": "Technology Director",
"emailAddress": "technology@thon.org"
},
"support": {
"givenName": "Lead Systems Admin",
"emailAddress": "systems@thon.org"
}
}

SAML_ORGANIZATION Example
SAML_ORGANIZATION = {
'en-US': {
'name': 'thon',
'displayname': 'THON',
'url': 'thon.org'
}
}

A Note About Attributes
All SAML attributes must have a name, but sometimes they may have a FriendlyName. All of the configuration settings in this library rely on the normal name, not friendly name. Please reference your IdP's attribute settings or analyze a SAML response to see the attributes available.
Some IdPs use obscure names like urn:oid:2.5.4.42 while others use firstName; just because the docs use a friendly-looking name does not mean it is the FriendlyName.
Advanced Configuration (Custom Backend)
For situations like advanced attribute mapping with groups, transforming SAML attributes, etc, you can create custom backends to use instead of the default.
Example:
from django.contrib.auth.models import Group
from django_saml.backends import SamlUserBackend

class CustomSamlBackend(SamlUserBackend):

def clean_username(self, username):
"""Return the first part of the email address.

Example: test@example.com -> test.
"""
return username.split('@')[0]

def configure_user(self, session_data, user, ignore_fields=None):
"""Custom attribute mapping with groups.

NOTE: ALL SAML attributes in session_data are arrays, even if there is only one element.
"""
# Call super() to take care of the simple attribute mapping in SAML_ATTR_MAP
user = super(CustomSamlBackend, self).configure_user(session_data, user, ignore_fields=ignore_fields)
for group_name in session_data['psMemberOf']:
group_name = group_name[5:]
g = Group.objects.get(name=group_name)
g.user_set.add(user)
return user

Credit
This project is a wrapper around OneLogin's python3-saml library.
Support
If you would like to support the development of this package, please consider donating to THON and supporting our mission.