# Pleroma: A lightweight social networking server # Copyright © 2017-2022 Pleroma Authors <https://pleroma.social/> # SPDX-License-Identifier: AGPL-3.0-only defmodule Pleroma.Gun.Conn do alias Pleroma.Gun require Logger def open(%URI{} = uri, opts) do pool_opts = Pleroma.Config.get([:connections_pool], []) opts = opts |> Enum.into(%{}) |> Map.put_new(:connect_timeout, pool_opts[:connect_timeout] || 5_000) |> Map.put_new(:supervise, false) |> maybe_add_tls_opts(uri) do_open(uri, opts) end defp maybe_add_tls_opts(opts, %URI{scheme: "http"}), do: opts defp maybe_add_tls_opts(opts, %URI{scheme: "https"}) do tls_opts = [ verify: :verify_peer, cacertfile: CAStore.file_path(), depth: 20, reuse_sessions: false, log_level: :warning, customize_hostname_check: [match_fun: :public_key.pkix_verify_hostname_match_fun(:https)] ] tls_opts = if Keyword.keyword?(opts[:tls_opts]) do Keyword.merge(tls_opts, opts[:tls_opts]) else tls_opts end Map.put(opts, :tls_opts, tls_opts) end defp do_open(uri, %{proxy: {proxy_host, proxy_port}} = opts) do connect_opts = uri |> destination_opts() |> add_http2_opts(uri.scheme, Map.get(opts, :tls_opts, [])) with open_opts <- Map.delete(opts, :tls_opts), {:ok, conn} <- Gun.open(proxy_host, proxy_port, open_opts), {:ok, protocol} <- Gun.await_up(conn, opts[:connect_timeout]), stream <- Gun.connect(conn, connect_opts), {:response, :fin, 200, _} <- Gun.await(conn, stream) do {:ok, conn, protocol} else error -> Logger.warn( "Opening proxied connection to #{compose_uri_log(uri)} failed with error #{inspect(error)}" ) error end end defp do_open(uri, %{proxy: {proxy_type, proxy_host, proxy_port}} = opts) do version = proxy_type |> to_string() |> String.last() |> case do "4" -> 4 _ -> 5 end socks_opts = uri |> destination_opts() |> add_http2_opts(uri.scheme, Map.get(opts, :tls_opts, [])) |> Map.put(:version, version) opts = opts |> Map.put(:protocols, [:socks]) |> Map.put(:socks_opts, socks_opts) with {:ok, conn} <- Gun.open(proxy_host, proxy_port, opts), {:ok, protocol} <- Gun.await_up(conn, opts[:connect_timeout]) do {:ok, conn, protocol} else error -> Logger.warn( "Opening socks proxied connection to #{compose_uri_log(uri)} failed with error #{inspect(error)}" ) error end end defp do_open(%URI{host: host, port: port} = uri, opts) do host = Pleroma.HTTP.AdapterHelper.parse_host(host) with {:ok, conn} <- Gun.open(host, port, opts), {:ok, protocol} <- Gun.await_up(conn, opts[:connect_timeout]) do {:ok, conn, protocol} else error -> Logger.warn( "Opening connection to #{compose_uri_log(uri)} failed with error #{inspect(error)}" ) error end end defp destination_opts(%URI{host: host, port: port}) do host = Pleroma.HTTP.AdapterHelper.parse_host(host) %{host: host, port: port} end defp add_http2_opts(opts, "https", tls_opts) do Map.merge(opts, %{protocols: [:http2], transport: :tls, tls_opts: tls_opts}) end defp add_http2_opts(opts, _, _), do: opts def compose_uri_log(%URI{scheme: scheme, host: host, path: path}) do "#{scheme}://#{host}#{path}" end end