From 7df0e88b9d68b7d34ff5827748dec135b85e0dd5 Mon Sep 17 00:00:00 2001
From: Jens L <jens@goauthentik.io>
Date: Sun, 7 May 2023 20:11:36 +0200
Subject: [PATCH] events: cleanse http query string in events (#5508)

* events: cleanse http query string in events

Signed-off-by: Jens Langhammer <jens@goauthentik.io>

* add more tests

Signed-off-by: Jens Langhammer <jens@goauthentik.io>

---------

Signed-off-by: Jens Langhammer <jens@goauthentik.io>
---
 authentik/events/models.py           |  4 +-
 authentik/events/tests/test_event.py | 65 +++++++++++++++++++++++++++-
 2 files changed, 66 insertions(+), 3 deletions(-)

diff --git a/authentik/events/models.py b/authentik/events/models.py
index f84e39e72..ef4fd9081 100644
--- a/authentik/events/models.py
+++ b/authentik/events/models.py
@@ -219,13 +219,13 @@ class Event(SerializerModel, ExpiringModel):
             self.context["http_request"] = {
                 "path": request.path,
                 "method": request.method,
-                "args": QueryDict(request.META.get("QUERY_STRING", "")),
+                "args": cleanse_dict(QueryDict(request.META.get("QUERY_STRING", ""))),
             }
             # Special case for events created during flow execution
             # since they keep the http query within a wrapped query
             if QS_QUERY in self.context["http_request"]["args"]:
                 wrapped = self.context["http_request"]["args"][QS_QUERY]
-                self.context["http_request"]["args"] = QueryDict(wrapped)
+                self.context["http_request"]["args"] = cleanse_dict(QueryDict(wrapped))
         if hasattr(request, "tenant"):
             tenant: Tenant = request.tenant
             # Because self.created only gets set on save, we can't use it's value here
diff --git a/authentik/events/tests/test_event.py b/authentik/events/tests/test_event.py
index cfc6fb1c7..4d636e9b2 100644
--- a/authentik/events/tests/test_event.py
+++ b/authentik/events/tests/test_event.py
@@ -1,17 +1,25 @@
 """event tests"""
+from urllib.parse import urlencode
 
 from django.contrib.contenttypes.models import ContentType
-from django.test import TestCase
+from django.test import RequestFactory, TestCase
+from django.views.debug import SafeExceptionReporterFilter
 from guardian.shortcuts import get_anonymous_user
 
 from authentik.core.models import Group
 from authentik.events.models import Event
+from authentik.flows.views.executor import QS_QUERY
+from authentik.lib.generators import generate_id
 from authentik.policies.dummy.models import DummyPolicy
+from authentik.tenants.models import Tenant
 
 
 class TestEvents(TestCase):
     """Test Event"""
 
+    def setUp(self) -> None:
+        self.factory = RequestFactory()
+
     def test_new_with_model(self):
         """Create a new Event passing a model as kwarg"""
         test_model = Group.objects.create(name="test")
@@ -40,3 +48,58 @@ class TestEvents(TestCase):
         model_content_type = ContentType.objects.get_for_model(temp_model)
         self.assertEqual(event.context.get("model").get("app"), model_content_type.app_label)
         self.assertEqual(event.context.get("model").get("pk"), temp_model.pk.hex)
+
+    def test_from_http_basic(self):
+        """Test plain from_http"""
+        event = Event.new("unittest").from_http(self.factory.get("/"))
+        self.assertEqual(
+            event.context, {"http_request": {"args": {}, "method": "GET", "path": "/"}}
+        )
+
+    def test_from_http_clean_querystring(self):
+        """Test cleansing query string"""
+        request = self.factory.get(f"/?token={generate_id()}")
+        event = Event.new("unittest").from_http(request)
+        self.assertEqual(
+            event.context,
+            {
+                "http_request": {
+                    "args": {"token": SafeExceptionReporterFilter.cleansed_substitute},
+                    "method": "GET",
+                    "path": "/",
+                }
+            },
+        )
+
+    def test_from_http_clean_querystring_flow(self):
+        """Test cleansing query string (nested query string like flow executor)"""
+        nested_qs = {"token": generate_id()}
+        request = self.factory.get(f"/?{QS_QUERY}={urlencode(nested_qs)}")
+        event = Event.new("unittest").from_http(request)
+        self.assertEqual(
+            event.context,
+            {
+                "http_request": {
+                    "args": {"token": SafeExceptionReporterFilter.cleansed_substitute},
+                    "method": "GET",
+                    "path": "/",
+                }
+            },
+        )
+
+    def test_from_http_tenant(self):
+        """Test from_http tenant"""
+        # Test tenant
+        request = self.factory.get("/")
+        tenant = Tenant(domain="test-tenant")
+        setattr(request, "tenant", tenant)
+        event = Event.new("unittest").from_http(request)
+        self.assertEqual(
+            event.tenant,
+            {
+                "app": "authentik_tenants",
+                "model_name": "tenant",
+                "name": "Tenant test-tenant",
+                "pk": tenant.pk.hex,
+            },
+        )