+# Pleroma: A lightweight social networking server
+# Copyright © 2017-2021 Pleroma Authors <https://pleroma.social/>
+# SPDX-License-Identifier: AGPL-3.0-only
+
defmodule Pleroma.Object.Containment do
@moduledoc """
- # Object Containment
-
This module contains some useful functions for containing objects to specific
origins and determining those origins. They previously lived in the
ActivityPub `Transmogrifier` module.
Object containment is an important step in validating remote objects to prevent
spoofing, therefore removal of object containment functions is NOT recommended.
"""
-
- require Logger
-
def get_actor(%{"actor" => actor}) when is_binary(actor) do
actor
end
get_actor(%{"actor" => actor})
end
+ def get_object(%{"object" => id}) when is_binary(id) do
+ id
+ end
+
+ def get_object(%{"object" => %{"id" => id}}) when is_binary(id) do
+ id
+ end
+
+ def get_object(_) do
+ nil
+ end
+
+ defp compare_uris(%URI{host: host} = _id_uri, %URI{host: host} = _other_uri), do: :ok
+ defp compare_uris(_id_uri, _other_uri), do: :error
+
@doc """
- Checks that an imported AP object's actor matches the domain it came from.
+ Checks that an imported AP object's actor matches the host it came from.
"""
- def contain_origin(id, %{"actor" => nil}), do: :error
+ def contain_origin(_id, %{"actor" => nil}), do: :error
- def contain_origin(id, %{"actor" => actor} = params) do
+ def contain_origin(id, %{"actor" => _actor} = params) do
id_uri = URI.parse(id)
actor_uri = URI.parse(get_actor(params))
- if id_uri.host == actor_uri.host do
- :ok
- else
- :error
- end
+ compare_uris(actor_uri, id_uri)
end
- def contain_origin_from_id(id, %{"id" => nil}), do: :error
+ def contain_origin(id, %{"attributedTo" => actor} = params),
+ do: contain_origin(id, Map.put(params, "actor", actor))
+
+ def contain_origin(_id, _data), do: :error
- def contain_origin_from_id(id, %{"id" => other_id} = params) do
+ def contain_origin_from_id(id, %{"id" => other_id} = _params) when is_binary(other_id) do
id_uri = URI.parse(id)
other_uri = URI.parse(other_id)
- if id_uri.host == other_uri.host do
- :ok
- else
- :error
- end
+ compare_uris(id_uri, other_uri)
+ end
+
+ # Mastodon pin activities don't have an id, so we check the object field, which will be pinned.
+ def contain_origin_from_id(id, %{"object" => object}) when is_binary(object) do
+ id_uri = URI.parse(id)
+ object_uri = URI.parse(object)
+
+ compare_uris(id_uri, object_uri)
end
+
+ def contain_origin_from_id(_id, _data), do: :error
+
+ def contain_child(%{"object" => %{"id" => id, "attributedTo" => _} = object}),
+ do: contain_origin(id, object)
+
+ def contain_child(_), do: :ok
end