Merge branch 'fix/object-attachment-spoof' into 'develop'

Fix object spoofing vulnerability in attachments

See merge request pleroma/secteam/pleroma!18

lib/pleroma/object/fetcher.ex

@@ -232,8 +232,24 @@ defmodule Pleroma.Object.Fetcher do
       |> sign_fetch(id, date)
 
     case HTTP.get(id, headers) do
-      {:ok, %{body: body, status: code}} when code in 200..299 ->
-        {:ok, body}
+      {:ok, %{body: body, status: code, headers: headers}} when code in 200..299 ->
+        case List.keyfind(headers, "content-type", 0) do
+          {_, content_type} ->
+            case Plug.Conn.Utils.media_type(content_type) do
+              {:ok, "application", "activity+json", _} ->
+                {:ok, body}
+
+              {:ok, "application", "ld+json",
+               %{"profile" => "https://www.w3.org/ns/activitystreams"}} ->
+                {:ok, body}
+
+              _ ->
+                {:error, {:content_type, content_type}}
+            end
+
+          _ ->
+            {:error, {:content_type, nil}}
+        end
 
       {:ok, %{status: code}} when code in [404, 410] ->
         {:error, "Object has been deleted"}