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authentik/passbook/sources/saml/views.py

138 lines
5.4 KiB
Python

"""saml sp views"""
from django.contrib.auth import logout
from django.contrib.auth.mixins import LoginRequiredMixin
from django.http import Http404, HttpRequest, HttpResponse
from django.shortcuts import get_object_or_404, redirect, render
from django.utils.decorators import method_decorator
from django.utils.http import urlencode
from django.utils.translation import gettext_lazy as _
from django.views import View
from django.views.decorators.csrf import csrf_exempt
from signxml import InvalidSignature
from signxml.util import strip_pem_header
from passbook.lib.views import bad_request_message
from passbook.providers.saml.utils import get_random_id, render_xml
from passbook.providers.saml.utils.encoding import deflate_and_base64_encode, nice64
from passbook.providers.saml.utils.time import get_time_string
from passbook.sources.saml.exceptions import (
MissingSAMLResponse,
UnsupportedNameIDFormat,
)
from passbook.sources.saml.models import SAMLBindingTypes, SAMLSource
from passbook.sources.saml.processors.base import Processor
from passbook.sources.saml.utils import build_full_url, get_issuer
from passbook.sources.saml.xml_render import get_authnrequest_xml
class InitiateView(View):
"""Get the Form with SAML Request, which sends us to the IDP"""
def get(self, request: HttpRequest, source_slug: str) -> HttpResponse:
"""Replies with an XHTML SSO Request."""
source: SAMLSource = get_object_or_404(SAMLSource, slug=source_slug)
if not source.enabled:
raise Http404
relay_state = request.GET.get("next", "")
request.session["sso_destination"] = relay_state
parameters = {
"ACS_URL": build_full_url("acs", request, source),
"DESTINATION": source.sso_url,
"AUTHN_REQUEST_ID": get_random_id(),
"ISSUE_INSTANT": get_time_string(),
"ISSUER": get_issuer(request, source),
"NAME_ID_POLICY": source.name_id_policy,
}
authn_req = get_authnrequest_xml(parameters, signed=False)
# If the source is configured for Redirect bindings, we can just redirect there
if source.binding_type == SAMLBindingTypes.Redirect:
_request = deflate_and_base64_encode(authn_req.encode())
url_args = urlencode({"SAMLRequest": _request, "RelayState": relay_state})
return redirect(f"{source.sso_url}?{url_args}")
# As POST Binding we show a form
_request = nice64(authn_req.encode())
if source.binding_type == SAMLBindingTypes.POST:
return render(
request,
"saml/sp/login.html",
{
"request_url": source.sso_url,
"request": _request,
"relay_state": relay_state,
"source": source,
},
)
# Or an auto-submit form
if source.binding_type == SAMLBindingTypes.POST_AUTO:
return render(
request,
"generic/autosubmit_form.html",
{
"title": _("Redirecting to %(app)s..." % {"app": source.name}),
"attrs": {"SAMLRequest": _request, "RelayState": relay_state},
"url": source.sso_url,
},
)
raise Http404
@method_decorator(csrf_exempt, name="dispatch")
class ACSView(View):
"""AssertionConsumerService, consume assertion and log user in"""
def post(self, request: HttpRequest, source_slug: str) -> HttpResponse:
"""Handles a POSTed SSO Assertion and logs the user in."""
source: SAMLSource = get_object_or_404(SAMLSource, slug=source_slug)
if not source.enabled:
raise Http404
processor = Processor(source)
try:
processor.parse(request)
except MissingSAMLResponse as exc:
return bad_request_message(request, str(exc))
except InvalidSignature as exc:
return bad_request_message(request, str(exc))
try:
return processor.prepare_flow(request)
except UnsupportedNameIDFormat as exc:
return bad_request_message(request, str(exc))
class SLOView(LoginRequiredMixin, View):
"""Single-Logout-View"""
def dispatch(self, request: HttpRequest, source_slug: str) -> HttpResponse:
"""Replies with an XHTML SSO Request."""
# TODO: Replace with flows
source: SAMLSource = get_object_or_404(SAMLSource, slug=source_slug)
if not source.enabled:
raise Http404
logout(request)
return render(
request,
"saml/sp/sso_single_logout.html",
{"idp_logout_url": source.slo_url},
)
class MetadataView(View):
"""Return XML Metadata for IDP"""
def dispatch(self, request: HttpRequest, source_slug: str) -> HttpResponse:
"""Replies with the XML Metadata SPSSODescriptor."""
source: SAMLSource = get_object_or_404(SAMLSource, slug=source_slug)
issuer = get_issuer(request, source)
cert_stripped = strip_pem_header(
source.signing_kp.certificate_data.replace("\r", "")
).replace("\n", "")
return render_xml(
request,
"saml/sp/xml/sp_sso_descriptor.xml",
{
"acs_url": build_full_url("acs", request, source),
"issuer": issuer,
"cert_public_key": cert_stripped,
},
)