From 739bbe0d3bbe06ca9d634498ea5909f35fc5ad84 Mon Sep 17 00:00:00 2001
From: Ariadne Conill <ariadne@dereferenced.org>
Date: Sun, 14 Jul 2019 17:47:08 +0000
Subject: [PATCH] security: detect object containment violations at the IR
 level

It is more efficient to check for object containment violations at the IR
level instead of in the protocol handlers.  OStatus containment is especially
a tricky situation, as the containment rules don't match those of IR and
ActivityPub.

Accordingly, we just always do a final containment check at the IR level
before the object is added to the IR object graph.
---
 lib/pleroma/object/containment.ex            |  8 ++++++
 lib/pleroma/web/activity_pub/activity_pub.ex |  2 ++
 test/object/containment_test.exs             | 30 ++++++++++++++++++++
 3 files changed, 40 insertions(+)

diff --git a/lib/pleroma/object/containment.ex b/lib/pleroma/object/containment.ex
index ada9da0bb..f077a9f32 100644
--- a/lib/pleroma/object/containment.ex
+++ b/lib/pleroma/object/containment.ex
@@ -48,6 +48,9 @@ defmodule Pleroma.Object.Containment do
     end
   end
 
+  def contain_origin(id, %{"attributedTo" => actor} = params),
+    do: contain_origin(id, Map.put(params, "actor", actor))
+
   def contain_origin_from_id(_id, %{"id" => nil}), do: :error
 
   def contain_origin_from_id(id, %{"id" => other_id} = _params) do
@@ -60,4 +63,9 @@ defmodule Pleroma.Object.Containment do
       :error
     end
   end
+
+  def contain_child(%{"object" => %{"id" => id, "attributedTo" => _} = object}),
+    do: contain_origin(id, object)
+
+  def contain_child(_), do: :ok
 end
diff --git a/lib/pleroma/web/activity_pub/activity_pub.ex b/lib/pleroma/web/activity_pub/activity_pub.ex
index a3174a787..87963b691 100644
--- a/lib/pleroma/web/activity_pub/activity_pub.ex
+++ b/lib/pleroma/web/activity_pub/activity_pub.ex
@@ -8,6 +8,7 @@ defmodule Pleroma.Web.ActivityPub.ActivityPub do
   alias Pleroma.Conversation
   alias Pleroma.Notification
   alias Pleroma.Object
+  alias Pleroma.Object.Containment
   alias Pleroma.Object.Fetcher
   alias Pleroma.Pagination
   alias Pleroma.Repo
@@ -126,6 +127,7 @@ defmodule Pleroma.Web.ActivityPub.ActivityPub do
          {:ok, map} <- MRF.filter(map),
          {recipients, _, _} = get_recipients(map),
          {:fake, false, map, recipients} <- {:fake, fake, map, recipients},
+         :ok <- Containment.contain_child(map),
          {:ok, map, object} <- insert_full_object(map) do
       {:ok, activity} =
         Repo.insert(%Activity{
diff --git a/test/object/containment_test.exs b/test/object/containment_test.exs
index 1beed6236..61cd1b412 100644
--- a/test/object/containment_test.exs
+++ b/test/object/containment_test.exs
@@ -68,4 +68,34 @@ defmodule Pleroma.Object.ContainmentTest do
                "[error] Could not decode user at fetch https://n1u.moe/users/rye, {:error, :error}"
     end
   end
+
+  describe "containment of children" do
+    test "contain_child() catches spoofing attempts" do
+      data = %{
+        "id" => "http://example.com/whatever",
+        "type" => "Create",
+        "object" => %{
+          "id" => "http://example.net/~alyssa/activities/1234",
+          "attributedTo" => "http://example.org/~alyssa"
+        },
+        "actor" => "http://example.com/~bob"
+      }
+
+      :error = Containment.contain_child(data)
+    end
+
+    test "contain_child() allows correct origins" do
+      data = %{
+        "id" => "http://example.org/~alyssa/activities/5678",
+        "type" => "Create",
+        "object" => %{
+          "id" => "http://example.org/~alyssa/activities/1234",
+          "attributedTo" => "http://example.org/~alyssa"
+        },
+        "actor" => "http://example.org/~alyssa"
+      }
+
+      :ok = Containment.contain_child(data)
+    end
+  end
 end
-- 
2.45.2