318 lines
12 KiB
Python
318 lines
12 KiB
Python
"""passbook SAML IDP Views"""
|
|
from typing import Optional
|
|
|
|
from django.contrib.auth import logout
|
|
from django.contrib.auth.mixins import AccessMixin
|
|
from django.core.exceptions import ValidationError
|
|
from django.core.validators import URLValidator
|
|
from django.http import HttpRequest, HttpResponse
|
|
from django.shortcuts import get_object_or_404, redirect, render, reverse
|
|
from django.utils.datastructures import MultiValueDictKeyError
|
|
from django.utils.decorators import method_decorator
|
|
from django.utils.html import mark_safe
|
|
from django.utils.translation import gettext as _
|
|
from django.views import View
|
|
from django.views.decorators.csrf import csrf_exempt
|
|
from signxml.util import strip_pem_header
|
|
from structlog import get_logger
|
|
|
|
from passbook.audit.models import Event, EventAction
|
|
from passbook.core.models import Application, Provider
|
|
from passbook.lib.utils.template import render_to_string
|
|
from passbook.lib.views import bad_request_message
|
|
from passbook.policies.engine import PolicyEngine
|
|
from passbook.providers.saml import exceptions
|
|
from passbook.providers.saml.models import SAMLProvider
|
|
from passbook.providers.saml.processors.types import SAMLResponseParams
|
|
|
|
LOGGER = get_logger()
|
|
URL_VALIDATOR = URLValidator(schemes=("http", "https"))
|
|
|
|
|
|
class AccessRequiredView(AccessMixin, View):
|
|
"""Mixin class for Views using a provider instance"""
|
|
|
|
_provider: Optional[SAMLProvider] = None
|
|
|
|
@property
|
|
def provider(self) -> SAMLProvider:
|
|
"""Get provider instance"""
|
|
if not self._provider:
|
|
application = get_object_or_404(
|
|
Application, slug=self.kwargs["application"]
|
|
)
|
|
provider: SAMLProvider = get_object_or_404(
|
|
SAMLProvider, pk=application.provider_id
|
|
)
|
|
self._provider = provider
|
|
return self._provider
|
|
return self._provider
|
|
|
|
def _has_access(self) -> bool:
|
|
"""Check if user has access to application"""
|
|
LOGGER.debug(
|
|
"_has_access", user=self.request.user, app=self.provider.application
|
|
)
|
|
policy_engine = PolicyEngine(
|
|
self.provider.application.policies.all(), self.request.user, self.request
|
|
)
|
|
policy_engine.build()
|
|
return policy_engine.passing
|
|
|
|
def dispatch(self, request: HttpRequest, *args, **kwargs) -> HttpResponse:
|
|
if not request.user.is_authenticated:
|
|
return self.handle_no_permission()
|
|
if not self._has_access():
|
|
return render(
|
|
request,
|
|
"login/denied.html",
|
|
{
|
|
"title": _("You don't have access to this application"),
|
|
"is_login": True,
|
|
},
|
|
)
|
|
return super().dispatch(request, *args, **kwargs)
|
|
|
|
|
|
class LoginBeginView(AccessRequiredView):
|
|
"""Receives a SAML 2.0 AuthnRequest from a Service Provider and
|
|
stores it in the session prior to enforcing login."""
|
|
|
|
@method_decorator(csrf_exempt)
|
|
def dispatch(self, request: HttpRequest, application: str) -> HttpResponse:
|
|
if request.method == "POST":
|
|
source = request.POST
|
|
else:
|
|
source = request.GET
|
|
|
|
# Store these values now, because Django's login cycle won't preserve them.
|
|
try:
|
|
request.session["SAMLRequest"] = source["SAMLRequest"]
|
|
except (KeyError, MultiValueDictKeyError):
|
|
return bad_request_message(request, "The SAML request payload is missing.")
|
|
|
|
request.session["RelayState"] = source.get("RelayState", "")
|
|
return redirect(
|
|
reverse(
|
|
"passbook_providers_saml:saml-login-process",
|
|
kwargs={"application": application},
|
|
)
|
|
)
|
|
|
|
|
|
class LoginProcessView(AccessRequiredView):
|
|
"""Processor-based login continuation.
|
|
Presents a SAML 2.0 Assertion for POSTing back to the Service Provider."""
|
|
|
|
def handle_redirect(
|
|
self, params: SAMLResponseParams, skipped_authorization: bool
|
|
) -> HttpResponse:
|
|
"""Handle direct redirect to SP"""
|
|
# Log Application Authorization
|
|
Event.new(
|
|
EventAction.AUTHORIZE_APPLICATION,
|
|
authorized_application=self.provider.application,
|
|
skipped_authorization=skipped_authorization,
|
|
).from_http(self.request)
|
|
return render(
|
|
self.request,
|
|
"saml/idp/autosubmit_form.html",
|
|
{
|
|
"url": params.acs_url,
|
|
"attrs": {
|
|
"SAMLResponse": params.saml_response,
|
|
"RelayState": params.relay_state,
|
|
},
|
|
},
|
|
)
|
|
|
|
def get(self, request: HttpRequest, application: str) -> HttpResponse:
|
|
"""Handle get request, i.e. render form"""
|
|
# User access gets checked in dispatch
|
|
|
|
# Otherwise we generate the IdP initiated session
|
|
try:
|
|
# application.skip_authorization is set so we directly redirect the user
|
|
if self.provider.application.skip_authorization:
|
|
self.provider.processor.can_handle(request)
|
|
saml_params = self.provider.processor.generate_response()
|
|
return self.handle_redirect(saml_params, True)
|
|
|
|
self.provider.processor.init_deep_link(request)
|
|
params = self.provider.processor.generate_response()
|
|
|
|
return render(
|
|
request,
|
|
"saml/idp/login.html",
|
|
{
|
|
"saml_params": params,
|
|
"provider": self.provider,
|
|
# This is only needed to for the template to render correctly
|
|
"is_login": True,
|
|
},
|
|
)
|
|
|
|
except exceptions.CannotHandleAssertion as exc:
|
|
LOGGER.error(exc)
|
|
did_you_mean_link = request.build_absolute_uri(
|
|
reverse(
|
|
"passbook_providers_saml:saml-login-initiate",
|
|
kwargs={"application": application},
|
|
)
|
|
)
|
|
did_you_mean_message = (
|
|
f" Did you mean to go <a href='{did_you_mean_link}'>here</a>?"
|
|
)
|
|
return bad_request_message(
|
|
request, mark_safe(str(exc) + did_you_mean_message)
|
|
)
|
|
|
|
# pylint: disable=unused-argument
|
|
def post(self, request: HttpRequest, application: str) -> HttpResponse:
|
|
"""Handle post request, return back to ACS"""
|
|
# User access gets checked in dispatch
|
|
|
|
# we get here when skip_authorization is False, and after the user accepted
|
|
# the authorization form
|
|
self.provider.processor.can_handle(request)
|
|
saml_params = self.provider.processor.generate_response()
|
|
return self.handle_redirect(saml_params, True)
|
|
|
|
|
|
@method_decorator(csrf_exempt, name="dispatch")
|
|
class LogoutView(AccessRequiredView):
|
|
"""Allows a non-SAML 2.0 URL to log out the user and
|
|
returns a standard logged-out page. (SalesForce and others use this method,
|
|
though it's technically not SAML 2.0)."""
|
|
|
|
# pylint: disable=unused-argument
|
|
def get(self, request: HttpRequest, application: str) -> HttpResponse:
|
|
"""Perform logout"""
|
|
logout(request)
|
|
|
|
redirect_url = request.GET.get("redirect_to", "")
|
|
|
|
try:
|
|
URL_VALIDATOR(redirect_url)
|
|
except ValidationError:
|
|
pass
|
|
else:
|
|
return redirect(redirect_url)
|
|
|
|
return render(request, "saml/idp/logged_out.html")
|
|
|
|
|
|
@method_decorator(csrf_exempt, name="dispatch")
|
|
class SLOLogout(AccessRequiredView):
|
|
"""Receives a SAML 2.0 LogoutRequest from a Service Provider,
|
|
logs out the user and returns a standard logged-out page."""
|
|
|
|
# pylint: disable=unused-argument
|
|
def post(self, request: HttpRequest, application: str) -> HttpResponse:
|
|
"""Perform logout"""
|
|
request.session["SAMLRequest"] = request.POST["SAMLRequest"]
|
|
# TODO: Parse SAML LogoutRequest from POST data, similar to login_process().
|
|
# TODO: Modify the base processor to handle logouts?
|
|
# TODO: Combine this with login_process(), since they are so very similar?
|
|
# TODO: Format a LogoutResponse and return it to the browser.
|
|
# XXX: For now, simply log out without validating the request.
|
|
logout(request)
|
|
return render(request, "saml/idp/logged_out.html")
|
|
|
|
|
|
class DescriptorDownloadView(AccessRequiredView):
|
|
"""Replies with the XML Metadata IDSSODescriptor."""
|
|
|
|
@staticmethod
|
|
def get_metadata(request: HttpRequest, provider: SAMLProvider) -> str:
|
|
"""Return rendered XML Metadata"""
|
|
entity_id = provider.issuer
|
|
slo_url = request.build_absolute_uri(
|
|
reverse(
|
|
"passbook_providers_saml:saml-logout",
|
|
kwargs={"application": provider.application.slug},
|
|
)
|
|
)
|
|
sso_url = request.build_absolute_uri(
|
|
reverse(
|
|
"passbook_providers_saml:saml-login",
|
|
kwargs={"application": provider.application.slug},
|
|
)
|
|
)
|
|
pubkey = strip_pem_header(provider.signing_cert.replace("\r", "")).replace(
|
|
"\n", ""
|
|
)
|
|
subject_format = provider.processor.subject_format
|
|
ctx = {
|
|
"entity_id": entity_id,
|
|
"cert_public_key": pubkey,
|
|
"slo_url": slo_url,
|
|
"sso_url": sso_url,
|
|
"subject_format": subject_format,
|
|
}
|
|
return render_to_string("saml/xml/metadata.xml", ctx)
|
|
|
|
# pylint: disable=unused-argument
|
|
def get(self, request: HttpRequest, application: str) -> HttpResponse:
|
|
"""Replies with the XML Metadata IDSSODescriptor."""
|
|
try:
|
|
metadata = DescriptorDownloadView.get_metadata(request, self.provider)
|
|
except Provider.application.RelatedObjectDoesNotExist: # pylint: disable=no-member
|
|
return bad_request_message(
|
|
request, "Provider is not assigned to an application."
|
|
)
|
|
else:
|
|
response = HttpResponse(metadata, content_type="application/xml")
|
|
response["Content-Disposition"] = (
|
|
'attachment; filename="' '%s_passbook_meta.xml"' % self.provider.name
|
|
)
|
|
return response
|
|
|
|
|
|
class InitiateLoginView(AccessRequiredView):
|
|
"""IdP-initiated Login"""
|
|
|
|
def handle_redirect(
|
|
self, params: SAMLResponseParams, skipped_authorization: bool
|
|
) -> HttpResponse:
|
|
"""Handle direct redirect to SP"""
|
|
# Log Application Authorization
|
|
Event.new(
|
|
EventAction.AUTHORIZE_APPLICATION,
|
|
authorized_application=self.provider.application,
|
|
skipped_authorization=skipped_authorization,
|
|
).from_http(self.request)
|
|
return render(
|
|
self.request,
|
|
"saml/idp/autosubmit_form.html",
|
|
{
|
|
"url": params.acs_url,
|
|
"attrs": {
|
|
"SAMLResponse": params.saml_response,
|
|
"RelayState": params.relay_state,
|
|
},
|
|
},
|
|
)
|
|
|
|
# pylint: disable=unused-argument
|
|
def get(self, request: HttpRequest, application: str) -> HttpResponse:
|
|
"""Initiates an IdP-initiated link to a simple SP resource/target URL."""
|
|
self.provider.processor.is_idp_initiated = True
|
|
self.provider.processor.init_deep_link(request)
|
|
params = self.provider.processor.generate_response()
|
|
|
|
# IdP-initiated Login Flow
|
|
if self.provider.application.skip_authorization:
|
|
return self.handle_redirect(params, True)
|
|
|
|
return render(
|
|
request,
|
|
"saml/idp/login.html",
|
|
{
|
|
"saml_params": params,
|
|
"provider": self.provider,
|
|
# This is only needed to for the template to render correctly
|
|
"is_login": True,
|
|
},
|
|
)
|