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