X-Git-Url: https://git.squeep.com/?a=blobdiff_plain;f=lib%2Fpleroma%2Fweb%2Fplugs%2Fhttp_signature_plug.ex;h=5ed3235e2e32985c4d0b736326d185396160dc08;hb=a90c45b7e92ef5fb77e16bd103894e58cd4e17c6;hp=036e2a7739e0ca16fb05412d15249fa6594c2ab3;hpb=d8d4e962304c5424de4d171d25445b7135a67a09;p=akkoma

diff --git a/lib/pleroma/web/plugs/http_signature_plug.ex b/lib/pleroma/web/plugs/http_signature_plug.ex
index 036e2a773..5ed3235e2 100644
--- a/lib/pleroma/web/plugs/http_signature_plug.ex
+++ b/lib/pleroma/web/plugs/http_signature_plug.ex
@@ -1,12 +1,18 @@
 # Pleroma: A lightweight social networking server
-# Copyright © 2017-2020 Pleroma Authors <https://pleroma.social/>
+# Copyright © 2017-2021 Pleroma Authors <https://pleroma.social/>
 # SPDX-License-Identifier: AGPL-3.0-only
 
 defmodule Pleroma.Web.Plugs.HTTPSignaturePlug do
   import Plug.Conn
   import Phoenix.Controller, only: [get_format: 1, text: 2]
+  alias Pleroma.Activity
+  alias Pleroma.Web.Router
+  alias Pleroma.Signature
+  alias Pleroma.Instances
   require Logger
 
+  @cachex Pleroma.Config.get([:cachex, :provider], Cachex)
+
   def init(options) do
     options
   end
@@ -25,21 +31,48 @@ defmodule Pleroma.Web.Plugs.HTTPSignaturePlug do
     end
   end
 
+  def route_aliases(%{path_info: ["objects", id], query_string: query_string}) do
+    ap_id = Router.Helpers.o_status_url(Pleroma.Web.Endpoint, :object, id)
+
+    with %Activity{} = activity <- Activity.get_by_object_ap_id_with_object(ap_id) do
+      ["/notice/#{activity.id}", "/notice/#{activity.id}?#{query_string}"]
+    else
+      _ -> []
+    end
+  end
+
+  def route_aliases(_), do: []
+
+  defp assign_valid_signature_on_route_aliases(conn, []), do: conn
+
+  defp assign_valid_signature_on_route_aliases(%{assigns: %{valid_signature: true}} = conn, _),
+    do: conn
+
+  defp assign_valid_signature_on_route_aliases(conn, [path | rest]) do
+    request_target = String.downcase("#{conn.method}") <> " #{path}"
+
+    conn =
+      conn
+      |> put_req_header("(request-target)", request_target)
+      |> case do
+        %{assigns: %{digest: digest}} = conn -> put_req_header(conn, "digest", digest)
+        conn -> conn
+      end
+
+    conn
+    |> assign(:valid_signature, HTTPSignatures.validate_conn(conn))
+    |> assign(:signature_actor_id, signature_host(conn))
+    |> assign_valid_signature_on_route_aliases(rest)
+  end
+
   defp maybe_assign_valid_signature(conn) do
     if has_signature_header?(conn) do
       # set (request-target) header to the appropriate value
       # we also replace the digest header with the one we computed
-      request_target = String.downcase("#{conn.method}") <> " #{conn.request_path}"
-
-      conn =
-        conn
-        |> put_req_header("(request-target)", request_target)
-        |> case do
-          %{assigns: %{digest: digest}} = conn -> put_req_header(conn, "digest", digest)
-          conn -> conn
-        end
+      possible_paths =
+        route_aliases(conn) ++ [conn.request_path, conn.request_path <> "?#{conn.query_string}"]
 
-      assign(conn, :valid_signature, HTTPSignatures.validate_conn(conn))
+      assign_valid_signature_on_route_aliases(conn, possible_paths)
     else
       Logger.debug("No signature header!")
       conn
@@ -50,6 +83,36 @@ defmodule Pleroma.Web.Plugs.HTTPSignaturePlug do
     conn |> get_req_header("signature") |> Enum.at(0, false)
   end
 
+  defp maybe_require_signature(
+         %{assigns: %{valid_signature: true, signature_actor_id: actor_id}} = conn
+       ) do
+    # inboxes implicitly need http signatures for authentication
+    # so we don't really know if the instance will have broken federation after
+    # we turn on authorized_fetch_mode.
+    #
+    # to "check" this is a signed fetch, verify if method is GET
+    if conn.method == "GET" do
+      actor_host = URI.parse(actor_id).host
+
+      case @cachex.get(:request_signatures_cache, actor_host) do
+        {:ok, nil} ->
+          Logger.debug("Successful signature from #{actor_host}")
+          Instances.set_request_signatures(actor_host)
+          @cachex.put(:request_signatures_cache, actor_host, true)
+
+        {:ok, true} ->
+          :noop
+
+        any ->
+          Logger.warn(
+            "expected request signature cache to return a boolean, instead got #{inspect(any)}"
+          )
+      end
+    end
+
+    conn
+  end
+
   defp maybe_require_signature(%{assigns: %{valid_signature: true}} = conn), do: conn
 
   defp maybe_require_signature(conn) do
@@ -62,4 +125,14 @@ defmodule Pleroma.Web.Plugs.HTTPSignaturePlug do
       conn
     end
   end
+
+  defp signature_host(conn) do
+    with %{"keyId" => kid} <- HTTPSignatures.signature_for_conn(conn),
+         {:ok, actor_id} <- Signature.key_id_to_actor_id(kid) do
+      actor_id
+    else
+      e ->
+        {:error, e}
+    end
+  end
 end