Merge develop to bump elixir version in the CI so I don't get failing formatting

[akkoma] / lib / pleroma / plugs / http_signature.ex

diff --git a/lib/pleroma/plugs/http_signature.ex b/lib/pleroma/plugs/http_signature.ex
index 17030cdbfcd594339bb87da602eb34ee30601262..21c1957135c0e5542847e7e2e4aa58682e5972b2 100644 (file)
--- a/lib/pleroma/plugs/http_signature.ex
+++ b/lib/pleroma/plugs/http_signature.ex
@@ -1,19 +1,54 @@
+# Pleroma: A lightweight social networking server
+# Copyright © 2017-2019 Pleroma Authors <https://pleroma.social/>
+# SPDX-License-Identifier: AGPL-3.0-only
+
 defmodule Pleroma.Web.Plugs.HTTPSignaturePlug do
+  alias Pleroma.Web.ActivityPub.Utils
   alias Pleroma.Web.HTTPSignatures
   import Plug.Conn
+  require Logger
 
   def init(options) do
     options
   end
 
-  def call(conn, opts) do
-    if get_req_header(conn, "signature") do
-      conn = conn
-      |> put_req_header("(request-target)", String.downcase("#{conn.method} #{conn.request_path}"))
+  def call(%{assigns: %{valid_signature: true}} = conn, _opts) do
+    conn
+  end
+
+  def call(conn, _opts) do
+    user = Utils.get_ap_id(conn.params["actor"])
+    Logger.debug("Checking sig for #{user}")
+    [signature | _] = get_req_header(conn, "signature")
+
+    cond do
+      signature && String.contains?(signature, user) ->
+        # set (request-target) header to the appropriate value
+        # we also replace the digest header with the one we computed
+        conn =
+          conn
+          |> put_req_header(
+            "(request-target)",
+            String.downcase("#{conn.method}") <> " #{conn.request_path}"
+          )
+
+        conn =
+          if conn.assigns[:digest] do
+            conn
+            |> put_req_header("digest", conn.assigns[:digest])
+          else
+            conn
+          end
+
+        assign(conn, :valid_signature, HTTPSignatures.validate_conn(conn))
+
+      signature ->
+        Logger.debug("Signature not from actor")
+        assign(conn, :valid_signature, false)
 
-      assign(conn, :valid_signature, HTTPSignatures.validate_conn(conn))
-    else
-      conn
+      true ->
+        Logger.debug("No signature header!")
+        conn
     end
   end
 end