provider/samlv2: more samlv2 progres

passbook/providers/samlv2/saml/constants.py

@@ -3,6 +3,11 @@ NS_SAML_PROTOCOL = "urn:oasis:names:tc:SAML:2.0:protocol"
 NS_SAML_ASSERTION = "urn:oasis:names:tc:SAML:2.0:assertion"
 NS_SIGNATURE = "http://www.w3.org/2000/09/xmldsig#"
 
+REQ_KEY_REQUEST = "SAMLRequest"
+REQ_KEY_SIGNATURE = "Signature"
+
+SESSION_KEY = "passbook_saml_request"
+
 SAML_ATTRIB_ACS_URL = "AssertionConsumerServiceURL"
 SAML_ATTRIB_DESTINATION = "Destination"
 SAML_ATTRIB_ID = "ID"

passbook/providers/samlv2/saml/provider.py

@@ -0,0 +1,5 @@
+"""SAML Provider logic"""
+
+
+class SAMLProvider:
+    """SAML Provider"""

passbook/providers/samlv2/urls.py

@@ -1,31 +1,34 @@
 """passbook samlv2 URLs"""
 from django.urls import path
 
-from passbook.providers.samlv2.views import idp_initiated, slo, sso
+from passbook.providers.samlv2.views import authorize, idp_initiated, slo, sso
 
 urlpatterns = [
     path(
-        "<slug:application>/sso/redirect/",
+        "<slug:app_slug>/authorize/",
+        authorize.AuthorizeView.as_view(),
+        name="authorize",
+    ),
+    path(
+        "<slug:app_slug>/sso/redirect/",
         sso.SAMLRedirectBindingView.as_view(),
         name="sso-redirect",
     ),
     path(
-        "<slug:application>/sso/post/",
+        "<slug:app_slug>/sso/post/", sso.SAMLPostBindingView.as_view(), name="sso-post",
-        sso.SAMLPostBindingView.as_view(),
-        name="sso-post",
     ),
     path(
-        "<slug:application>/slo/redirect/",
+        "<slug:app_slug>/slo/redirect/",
         slo.SAMLRedirectBindingView.as_view(),
         name="slo-redirect",
     ),
     path(
-        "<slug:application>/slo/redirect/",
+        "<slug:app_slug>/slo/redirect/",
         slo.SAMLPostBindingView.as_view(),
         name="slo-post",
     ),
     path(
-        "<slug:application>/initiate/",
+        "<slug:app_slug>/initiate/",
         idp_initiated.IDPInitiatedView.as_view(),
         name="initiate",
     ),

passbook/providers/samlv2/views/authorize.py

@@ -0,0 +1,6 @@
+"""SAML Provider authorization view"""
+from django.views.generic import FormView
+
+
+class AuthorizeView(FormView):
+    """Authorization view"""

passbook/providers/samlv2/views/base.py

@@ -0,0 +1,31 @@
+"""SAML base views"""
+from typing import Optional
+
+from django.http import HttpRequest, HttpResponse
+from django.shortcuts import get_object_or_404
+from django.views import View
+
+from passbook.core.models import Application
+from passbook.core.views.access import AccessMixin
+from passbook.providers.samlv2.saml.constants import SESSION_KEY
+from passbook.providers.samlv2.saml.parser import SAMLRequest
+
+
+class BaseSAMLView(AccessMixin, View):
+    """Base SAML View to resolve app_slug"""
+
+    application: Application
+
+    def setup(self, request: HttpRequest, *args, **kwargs):
+        View.setup(self, request, *args, **kwargs)
+        self.application = self.get_application(self.kwargs.get("app_slug"))
+
+    def get_application(self, app_slug: str) -> Optional[Application]:
+        """Return application or raise 404"""
+        return get_object_or_404(Application, slug=app_slug)
+
+    def handle_saml_request(self, request: SAMLRequest) -> HttpResponse:
+        """Handle SAML Request"""
+        self.request.SESSION[SESSION_KEY] = request
+        if self.application.skip_authorization:
+            pass

passbook/providers/samlv2/views/sso.py

@@ -1,10 +1,41 @@
 """Single Signon Views"""
-from django.views import View
+from django.http import HttpRequest, HttpResponse, HttpResponseBadRequest
+
+from passbook.providers.samlv2.saml.constants import REQ_KEY_REQUEST, REQ_KEY_SIGNATURE
+from passbook.providers.samlv2.saml.parser import SAMLRequest
+from passbook.providers.samlv2.views.base import BaseSAMLView
+
+# SAML Authentication flow in passbook
+# - Parse and Verify SAML Request
+# - Check access to application (this is done after parsing as it might take a few seconds)
+# - Ask for user authorization (if required from Application)
+# - Log Access to audit log
+# - Create response with unique ID to protect against replay
 
 
-class SAMLPostBindingView(View):
+class SAMLPostBindingView(BaseSAMLView):
     """Handle SAML POST-type Requests"""
 
+    # pylint: disable=unused-argument
+    def post(self, request: HttpRequest, app_slug: str) -> HttpResponse:
+        """Handle POST Requests"""
+        if REQ_KEY_REQUEST not in request.POST:
+            return HttpResponseBadRequest()
+        raw_saml_request = request.POST.get(REQ_KEY_REQUEST)
+        detached_signature = request.POST.get(REQ_KEY_SIGNATURE, None)
+        srq = SAMLRequest.parse(raw_saml_request, detached_signature)
+        return self.handle_saml_request(srq)
 
-class SAMLRedirectBindingView(View):
+
+class SAMLRedirectBindingView(BaseSAMLView):
     """Handle SAML Redirect-type Requests"""
+
+    # pylint: disable=unused-argument
+    def get(self, request: HttpRequest, app_slug: str) -> HttpResponse:
+        """Handle GET Requests"""
+        if REQ_KEY_REQUEST not in request.GET:
+            return HttpResponseBadRequest()
+        raw_saml_request = request.GET.get(REQ_KEY_REQUEST)
+        detached_signature = request.GET.get(REQ_KEY_SIGNATURE, None)
+        srq = SAMLRequest.parse(raw_saml_request, detached_signature)
+        return self.handle_saml_request(srq)