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This commit incldues a wrapper application which handles
the Private Key JWT method of authenticating via OpenID
Connect using the underlying pyoidc library.
This commit is contained in:
Seamus Johnston 2022-09-13 09:15:40 -05:00
parent 331d2e575a
commit 00f87168e5
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Python module to integrate pyoic into django
Copyright 2014 Andrea Biancini
This product includes software developed by
Andrea Biancini <andrea.biancini@gmail.com>
Portions of this software is derived from the pyoidc project
avaialble from
https://github.com/rohe/pyoidc

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Django OpenID Connect (OIDC) authentication provider
====================================================
This module makes it easy to integrate OpenID Connect as an authentication source in a Django project.
Behind the scenes, it uses Roland Hedberg's great pyoidc library.
Modified by JHUAPL BOSS to support Python3
Modified by Thomas Frössman with fixes and additional modifications.
A note for anyone viewing this file from the .gov repository:
This code has been included from its upstream counterpart in order to minimize external dependencies. Here is an excerpt from setup.py::
name='django-oidc-tf',
description="""A Django OpenID Connect (OIDC) authentication backend""",
author='Thomas Frössman',
author_email='thomasf@jossystem.se',
url='https://github.com/py-pa/django-oidc',
packages=[
'djangooidc',
],
include_package_data=True,
install_requires=[
'django>=1.10',
'oic>=0.10.0',
],
It was taken from https://github.com/koriaf/django-oidc at ae4a0ba5e6bfda1495f9447a507e6f54cc056980.

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# coding: utf-8
from __future__ import unicode_literals
import logging
from django.conf import settings
from django.contrib.auth import get_user_model
from django.contrib.auth.backends import ModelBackend
from django.utils import timezone
logger = logging.getLogger(__name__)
class OpenIdConnectBackend(ModelBackend):
"""
This backend checks a previously performed OIDC authentication.
If it is OK and the user already exists in the database, it is returned.
If it is OK and user does not exist in the database, it is created and
returned unless setting OIDC_CREATE_UNKNOWN_USER is False.
In all other cases, None is returned.
"""
def authenticate(self, request, **kwargs):
logger.debug("kwargs %s" % kwargs)
user = None
if not kwargs or "sub" not in kwargs.keys():
return user
UserModel = get_user_model()
username = self.clean_username(kwargs["sub"])
if "upn" in kwargs.keys():
username = kwargs["upn"]
# Some OP may actually choose to withhold some information, so we must
# test if it is present
openid_data = {"last_login": timezone.now()}
if "first_name" in kwargs.keys():
openid_data["first_name"] = kwargs["first_name"]
if "given_name" in kwargs.keys():
openid_data["first_name"] = kwargs["given_name"]
if "christian_name" in kwargs.keys():
openid_data["first_name"] = kwargs["christian_name"]
if "family_name" in kwargs.keys():
openid_data["last_name"] = kwargs["family_name"]
if "last_name" in kwargs.keys():
openid_data["last_name"] = kwargs["last_name"]
if "email" in kwargs.keys():
openid_data["email"] = kwargs["email"]
# Note that this could be accomplished in one try-except clause, but
# instead we use get_or_create when creating unknown users since it has
# built-in safeguards for multiple threads.
if getattr(settings, "OIDC_CREATE_UNKNOWN_USER", True):
args = {
UserModel.USERNAME_FIELD: username,
"defaults": openid_data,
}
user, created = UserModel.objects.update_or_create(**args)
if created:
user = self.configure_user(user, **kwargs)
else:
try:
user = UserModel.objects.get_by_natural_key(username)
except UserModel.DoesNotExist:
try:
user = UserModel.objects.get(email=kwargs["email"])
except UserModel.DoesNotExist:
return None
return user
def clean_username(self, username):
"""
Performs any cleaning on the "username" prior to using it to get or
create the user object. Returns the cleaned username.
"""
return username
def configure_user(self, user, **kwargs):
"""
Configures a user after creation and returns the updated user.
"""
user.set_unusable_password()
return user

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from oic import rndstr
from http import HTTPStatus as status
class OIDCException(Exception):
"""
Base class for django oidc exceptions.
Subclasses should provide `.status` and `.friendly_message` properties.
`.locator`, if used, should be a useful, unique identifier for
locating related log messages.
"""
status = status.INTERNAL_SERVER_ERROR
friendly_message = "A server error occurred."
locator = None
def __init__(
self,
friendly_message=None,
status=None,
locator=None
):
if friendly_message is not None:
self.friendly_message = friendly_message
if status is not None:
self.status = status
if locator is not None:
self.locator = locator
else:
self.locator = rndstr(size=12)
def __str__(self):
return f"[{self.locator}] {self.friendly_message}"
class AuthenticationFailed(OIDCException):
status = status.UNAUTHORIZED
friendly_message = "This login attempt didn't work."
class InternalError(OIDCException):
status = status.INTERNAL_SERVER_ERROR
friendly_message = "The system broke while trying to log you in."
class BannedUser(AuthenticationFailed):
friendly_message = "Your user is not valid in this application."

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# coding: utf-8
from __future__ import unicode_literals
import logging
import json
try:
from builtins import unicode as str
except ImportError:
pass
from django.conf import settings
from django.http import HttpResponseRedirect
from Cryptodome.PublicKey.RSA import importKey
from jwkest.jwk import RSAKey
from oic import oic, rndstr
from oic.oauth2 import ErrorResponse
from oic.oic import AuthorizationRequest, AuthorizationResponse, RegistrationResponse
from oic.oic.message import AccessTokenResponse
from oic.utils.authn.client import CLIENT_AUTHN_METHOD
from oic.utils import keyio
from . import exceptions as o_e
__author__ = "roland"
logger = logging.getLogger(__name__)
class Client(oic.Client):
def __init__(self, op):
"""Step 1: Configure the OpenID Connect client."""
logger.debug("Initializing the OpenID Connect client...")
try:
provider = settings.OIDC_PROVIDERS[op]
verify_ssl = getattr(settings, "OIDC_VERIFY_SSL", True)
except Exception as err:
logger.error(err)
logger.error("Configuration missing for OpenID Connect client")
raise o_e.InternalError()
try:
# prepare private key for authentication method of private_key_jwt
key_bundle = keyio.KeyBundle()
rsa_key = importKey(provider["client_registration"]["sp_private_key"])
key = RSAKey(key=rsa_key, use="sig")
key_bundle.append(key)
keyjar = keyio.KeyJar(verify_ssl=verify_ssl)
keyjar.add_kb("", key_bundle)
except Exception as err:
logger.error(err)
logger.error(
"Key jar preparation failed for %s", provider["srv_discovery_url"],
)
raise o_e.InternalError()
try:
# create the oic client instance
super().__init__(
client_id=None,
client_authn_method=CLIENT_AUTHN_METHOD,
keyjar=keyjar,
verify_ssl=verify_ssl,
config=None,
)
# must be set after client is initialized
self.behaviour = provider["behaviour"]
except Exception as err:
logger.error(err)
logger.error(
"Client creation failed for %s", provider["srv_discovery_url"],
)
raise o_e.InternalError()
try:
# discover and store the provider (OP) urls, etc
self.provider_config(provider["srv_discovery_url"])
self.store_registration_info(
RegistrationResponse(**provider["client_registration"])
)
except Exception as err:
logger.error(err)
logger.error(
"Provider info discovery failed for %s", provider["srv_discovery_url"],
)
raise o_e.InternalError()
def create_authn_request(
self,
session,
extra_args=None,
):
"""Step 2: Construct a login URL at OP's domain and send the user to it."""
logger.debug("Creating the OpenID Connect authn request...")
state = rndstr(size=32)
try:
session["state"] = state
session["nonce"] = rndstr(size=32)
scopes = list(self.behaviour.get("scope", []))
scopes.append("openid")
request_args = {
"response_type": self.behaviour.get("response_type"),
"scope": " ".join(set(scopes)),
"state": session["state"],
"nonce": session["nonce"],
"redirect_uri": self.registration_response["redirect_uris"][0],
"acr_values": self.behaviour.get("acr_value")
}
if extra_args is not None:
request_args.update(extra_args)
except Exception as err:
logger.error(err)
logger.error("Failed to assemble request arguments for %s" % state)
raise o_e.InternalError(locator=state)
logger.debug("request args: %s" % request_args)
try:
# prepare the request for sending
cis = self.construct_AuthorizationRequest(request_args=request_args)
logger.debug("request: %s" % cis)
# obtain the url and headers from the prepared request
url, body, headers, cis = self.uri_and_body(
AuthorizationRequest,
cis,
method="GET",
request_args=request_args,
)
logger.debug("body: %s" % body)
logger.debug("URL: %s" % url)
logger.debug("headers: %s" % headers)
except Exception as err:
logger.error(err)
logger.error("Failed to prepare request for %s" % state)
raise o_e.InternalError(locator=state)
try:
# create the redirect object
response = HttpResponseRedirect(str(url))
# add headers to the object, if any
if headers:
for key, value in headers.items():
response[key] = value
except Exception as err:
logger.error(err)
logger.error("Failed to create redirect object for %s" % state)
raise o_e.InternalError(locator=state)
return response
def callback(self, unparsed_response, session):
"""Step 3: Receive OP's response, request an access token, and user info."""
logger.debug("Processing the OpenID Connect callback response...")
state = session.get("state", "")
try:
# parse the response from OP
authn_response = self.parse_response(
AuthorizationResponse,
unparsed_response,
sformat="dict",
keyjar=self.keyjar
)
except Exception as err:
logger.error(err)
logger.error("Unable to parse response for %s" % state)
raise o_e.AuthenticationFailed(locator=state)
# ErrorResponse is not raised, it is passed back...
if isinstance(authn_response, ErrorResponse):
error = authn_response.get("error", "")
if error == "login_required":
logger.warning("User was not logged in (%s), trying again for %s" % (error, state))
return self.create_authn_request(session)
else:
logger.error("Unable to process response %s for %s" % (error, state))
raise o_e.AuthenticationFailed(locator=state)
logger.debug("authn_response %s" % authn_response)
if not authn_response.get("state", None):
logger.error("State value not received from OP for %s" % state)
raise o_e.AuthenticationFailed(locator=state)
if authn_response["state"] != session.get("state", None):
# this most likely means the user's Django session vanished
logger.error("Received state not the same as expected for %s" % state)
raise o_e.AuthenticationFailed(locator=state)
if self.behaviour.get("response_type") == "code":
try:
# request a new token by which we may interact with OP
# on behalf of the user
token_response = self.do_access_token_request(
scope="openid",
state=authn_response["state"],
request_args={
"code": authn_response["code"],
"redirect_uri": self.registration_response["redirect_uris"][0],
"client_id": self.client_id,
"client_secret": self.client_secret,
},
authn_method=self.registration_response[
"token_endpoint_auth_method"
],
)
except Exception as err:
logger.error(err)
logger.error("Unable to obtain access token for %s" % state)
raise o_e.AuthenticationFailed(locator=state)
# ErrorResponse is not raised, it is passed back...
if isinstance(token_response, ErrorResponse):
logger.error("Unable to get token (%s) for %s" % (token_response.get("error",""), state))
raise o_e.AuthenticationFailed(locator=state)
logger.debug("token response %s" % token_response)
try:
# get the token and other bits of info
id_token = token_response["id_token"]._dict
if id_token["nonce"] != session["nonce"]:
logger.error("Received nonce not the same as expected for %s" % state)
raise o_e.AuthenticationFailed(locator=state)
session["id_token"] = id_token
session["id_token_raw"] = getattr(self, "id_token_raw", None)
session["access_token"] = token_response["access_token"]
session["refresh_token"] = token_response.get("refresh_token", "")
session["expires_in"] = token_response.get("expires_in", "")
self.id_token[authn_response["state"]] = getattr(self, "id_token_raw", None)
except Exception as err:
logger.error(err)
logger.error("Unable to parse access token response for %s" % state)
raise o_e.AuthenticationFailed(locator=state)
scopes = list(self.behaviour.get("user_info_request", []))
scopes.append("openid")
try:
# get info about the user from OP
info_response = self.do_user_info_request(
state=session["state"],
method="GET",
scope=" ".join(set(scopes)),
)
except Exception as err:
logger.error(err)
logger.error("Unable to request user info for %s" % state)
raise o_e.AuthenticationFailed(locator=state)
# ErrorResponse is not raised, it is passed back...
if isinstance(info_response, ErrorResponse):
logger.error("Unable to get user info (%s) for %s" % (info_response.get("error",""), state))
raise o_e.AuthenticationFailed(locator=state)
user_info = info_response.to_dict()
logger.debug("user info: %s" % user_info)
return user_info
def store_response(self, resp, info):
"""Make raw ID token available for internal use."""
if isinstance(resp, AccessTokenResponse):
info = json.loads(info)
self.id_token_raw = info["id_token"]
super(Client, self).store_response(resp, info)
def __repr__(self):
return "Client {} {} {}".format(
self.client_id,
self.client_prefs,
self.behaviour,
)

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# coding: utf-8
from django.urls import path
from . import views
urlpatterns = [
path("login/", views.openid, name="openid"),
path("callback/login/", views.login_callback, name="openid_login_callback"),
path("logout/", views.logout, name="logout"),
path("callback/logout/", views.logout_callback, name="openid_logout_callback"),
]

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# coding: utf-8
import logging
try:
from urllib.parse import parse_qs, urlencode
except ImportError:
from urllib import urlencode
from urlparse import parse_qs
from django.conf import settings
from django.contrib.auth import logout as auth_logout
from django.contrib.auth import authenticate, login
from django.http import HttpResponseRedirect
from django.shortcuts import redirect, render
from djangooidc.oidc import Client
from djangooidc import exceptions as o_e
logger = logging.getLogger(__name__)
# Initialize provider using pyOICD
OP = getattr(settings, "OIDC_ACTIVE_PROVIDER")
CLIENT = Client(OP)
logger.debug("client initialized %s" % CLIENT)
def error_page(request, error):
"""Display a sensible message and log the error."""
logger.error(error)
if isinstance(error, o_e.AuthenticationFailed):
return render(
request,
"401.html",
context={
"friendly_message": error.friendly_message,
"log_identifier": error.locator
},
status=401
)
if isinstance(error, o_e.InternalError):
return render(
request,
"500.html",
context={
"friendly_message": error.friendly_message,
"log_identifier": error.locator
},
status=500
)
if isinstance(error, Exception):
return render(request, "500.html", status=500)
def openid(request):
"""Redirect the user to an authentication provider (OP)."""
request.session["next"] = request.GET.get("next", "/")
try:
return CLIENT.create_authn_request(request.session)
except Exception as err:
return error_page(request, err)
def login_callback(request):
"""Analyze the token returned by the authentication provider (OP)."""
try:
query = parse_qs(request.GET.urlencode())
userinfo = CLIENT.callback(query, request.session)
user = authenticate(request=request, **userinfo)
if user:
login(request, user)
logger.info("Successfully logged in user %s" % user)
return redirect(request.session.get("next", "/"))
else:
raise o_e.BannedUser()
except Exception as err:
return error_page(request, err)
def logout(request, next_page=None):
"""Redirect the user to the authentication provider (OP) logout page."""
try:
username = request.user.username
request_args = {
# it is perfectly fine to send the token, even if it is expired
"id_token_hint": request.session["id_token_raw"],
"state": request.session["state"],
}
if (
"post_logout_redirect_uris" in CLIENT.registration_response.keys()
and len(CLIENT.registration_response["post_logout_redirect_uris"]) > 0
):
request_args.update({
"post_logout_redirect_uri":
CLIENT.registration_response["post_logout_redirect_uris"][0]
})
url = CLIENT.provider_info["end_session_endpoint"]
url += "?" + urlencode(request_args)
return HttpResponseRedirect(url)
except Exception as err:
return error_page(request, err)
finally:
# Always remove Django session stuff - even if not logged out from OP.
# Don't wait for the callback as it may never come.
auth_logout(request)
logger.info("Successfully logged out user %s" % username)
next_page = getattr(settings, "LOGOUT_REDIRECT_URL", None)
if next_page:
request.session["next"] = next_page
def logout_callback(request):
"""Simple redirection view: after logout, redirect to `next`."""
next = request.session["next"] if "next" in request.session.keys() else "/"
return redirect(next)