91 lines
2.5 KiB
Elixir
91 lines
2.5 KiB
Elixir
# Pleroma: A lightweight social networking server
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# Copyright © 2017-2021 Pleroma Authors <https://pleroma.social/>
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# SPDX-License-Identifier: AGPL-3.0-only
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defmodule Pleroma.Web.Plugs.HTTPSignaturePlug do
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import Plug.Conn
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import Phoenix.Controller, only: [get_format: 1, text: 2]
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alias Pleroma.Activity
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alias Pleroma.Web.Router
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require Logger
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def init(options) do
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options
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end
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def call(%{assigns: %{valid_signature: true}} = conn, _opts) do
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conn
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end
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def call(conn, _opts) do
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if get_format(conn) == "activity+json" do
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conn
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|> maybe_assign_valid_signature()
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|> maybe_require_signature()
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else
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conn
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end
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end
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def route_aliases(%{path_info: ["objects", id]}) do
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ap_id = Router.Helpers.o_status_url(Pleroma.Web.Endpoint, :object, id)
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with %Activity{} = activity <- Activity.get_by_object_ap_id_with_object(ap_id) do
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["/notice/#{activity.id}"]
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else
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_ -> []
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end
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end
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def route_aliases(_), do: []
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defp assign_valid_signature_on_route_aliases(conn, []), do: conn
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defp assign_valid_signature_on_route_aliases(%{assigns: %{valid_signature: true}} = conn, _),
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do: conn
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defp assign_valid_signature_on_route_aliases(conn, [path | rest]) do
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request_target = String.downcase("#{conn.method}") <> " #{path}"
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conn =
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conn
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|> put_req_header("(request-target)", request_target)
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|> case do
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%{assigns: %{digest: digest}} = conn -> put_req_header(conn, "digest", digest)
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conn -> conn
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end
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conn
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|> assign(:valid_signature, HTTPSignatures.validate_conn(conn))
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|> assign_valid_signature_on_route_aliases(rest)
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end
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defp maybe_assign_valid_signature(conn) do
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if has_signature_header?(conn) do
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# set (request-target) header to the appropriate value
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# we also replace the digest header with the one we computed
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possible_paths = route_aliases(conn) ++ [conn.request_path]
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assign_valid_signature_on_route_aliases(conn, possible_paths)
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else
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Logger.debug("No signature header!")
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conn
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end
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end
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defp has_signature_header?(conn) do
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conn |> get_req_header("signature") |> Enum.at(0, false)
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end
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defp maybe_require_signature(%{assigns: %{valid_signature: true}} = conn), do: conn
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defp maybe_require_signature(conn) do
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if Pleroma.Config.get([:activitypub, :authorized_fetch_mode], false) do
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conn
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|> put_status(:unauthorized)
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|> text("Request not signed")
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|> halt()
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else
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conn
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end
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end
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end
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