git.squeep.com Git - akkoma/blob - lib/pleroma/plugs/remote_ip.ex

   1 # Pleroma: A lightweight social networking server
   2 # Copyright © 2017-2019 Pleroma Authors <https://pleroma.social/>
   3 # SPDX-License-Identifier: AGPL-3.0-only
   4
   5 defmodule Pleroma.Plugs.RemoteIp do
   6   @moduledoc """
   7   This is a shim to call [`RemoteIp`](https://git.pleroma.social/pleroma/remote_ip) but with runtime configuration.
   8   """
   9
  10   @behaviour Plug
  11
  12   @headers ~w[
  13     forwarded
  14     x-forwarded-for
  15     x-client-ip
  16     x-real-ip
  17   ]
  18
  19   # https://en.wikipedia.org/wiki/Localhost
  20   # https://en.wikipedia.org/wiki/Private_network
  21   @reserved ~w[
  22     127.0.0.0/8
  23     ::1/128
  24     fc00::/7
  25     10.0.0.0/8
  26     172.16.0.0/12
  27     192.168.0.0/16
  28   ]
  29
  30   def init(_), do: nil
  31
  32   def call(conn, _) do
  33     config = Pleroma.Config.get(__MODULE__, [])
  34
  35     if Keyword.get(config, :enabled, false) do
  36       RemoteIp.call(conn, remote_ip_opts(config))
  37     else
  38       conn
  39     end
  40   end
  41
  42   defp remote_ip_opts(config) do
  43     headers = config |> Keyword.get(:headers, @headers) |> MapSet.new()
  44     reserved = Keyword.get(config, :reserved, @reserved)
  45
  46     proxies =
  47       config
  48       |> Keyword.get(:proxies, [])
  49       |> Enum.concat(reserved)
  50       |> Enum.map(&InetCidr.parse/1)
  51
  52     {headers, proxies}
  53   end
  54 end