From f9380289eb251c818e87e8f0ad0a41fc8bdd90aa Mon Sep 17 00:00:00 2001 From: minibikini Date: Fri, 27 Sep 2019 21:59:23 +0000 Subject: [PATCH] Add `remote_ip` plug --- CHANGELOG.md | 1 + config/config.exs | 2 ++ config/description.exs | 36 +++++++++++++++++++++ docs/config.md | 15 +++++++++ installation/pleroma.nginx | 1 + lib/pleroma/plugs/remote_ip.ex | 54 +++++++++++++++++++++++++++++++ lib/pleroma/web/endpoint.ex | 5 +-- mix.exs | 3 ++ mix.lock | 2 ++ test/plugs/remote_ip_test.exs | 72 ++++++++++++++++++++++++++++++++++++++++++ 10 files changed, 187 insertions(+), 4 deletions(-) create mode 100644 lib/pleroma/plugs/remote_ip.ex create mode 100644 test/plugs/remote_ip_test.exs diff --git a/CHANGELOG.md b/CHANGELOG.md index 0a8163135..1d307f0e1 100644 --- a/CHANGELOG.md +++ b/CHANGELOG.md @@ -113,6 +113,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/). - Pleroma API: Add `/api/v1/pleroma/accounts/confirmation_resend?email=` for resending account confirmation. - Pleroma API: Email change endpoint. - Admin API: Added moderation log +- Support for `X-Forwarded-For` and similar HTTP headers which used by reverse proxies to pass a real user IP address to the backend. Must not be enabled unless your instance is behind at least one reverse proxy (such as Nginx, Apache HTTPD or Varnish Cache). - Web response cache (currently, enabled for ActivityPub) - Mastodon API: Added an endpoint to get multiple statuses by IDs (`GET /api/v1/statuses/?ids[]=1&ids[]=2`) - ActivityPub: Add ActivityPub actor's `discoverable` parameter. diff --git a/config/config.exs b/config/config.exs index 403ade60d..36bea19a0 100644 --- a/config/config.exs +++ b/config/config.exs @@ -591,6 +591,8 @@ config :pleroma, :rate_limit, nil config :pleroma, Pleroma.ActivityExpiration, enabled: true +config :pleroma, Pleroma.Plugs.RemoteIp, enabled: false + config :pleroma, :web_cache_ttl, activity_pub: nil, activity_pub_question: 30_000 diff --git a/config/description.exs b/config/description.exs index 38b30bbf6..4547ea368 100644 --- a/config/description.exs +++ b/config/description.exs @@ -2689,6 +2689,42 @@ config :pleroma, :config_description, [ }, %{ group: :pleroma, + key: Pleroma.Plugs.RemoteIp, + type: :group, + description: """ + **If your instance is not behind at least one reverse proxy, you should not enable this plug.** + + `Pleroma.Plugs.RemoteIp` is a shim to call [`RemoteIp`](https://git.pleroma.social/pleroma/remote_ip) but with runtime configuration. + """, + children: [ + %{ + key: :enabled, + type: :boolean, + description: "Enable/disable the plug. Defaults to `false`.", + suggestions: [true, false] + }, + %{ + key: :headers, + type: {:list, :string}, + description: + "A list of strings naming the `req_headers` to use when deriving the `remote_ip`. Order does not matter. Defaults to `~w[forwarded x-forwarded-for x-client-ip x-real-ip]`." + }, + %{ + key: :proxies, + type: {:list, :string}, + description: + "A list of strings in [CIDR](https://en.wikipedia.org/wiki/CIDR) notation specifying the IPs of known proxies. Defaults to `[]`." + }, + %{ + key: :reserved, + type: {:list, :string}, + description: + "Defaults to [localhost](https://en.wikipedia.org/wiki/Localhost) and [private network](https://en.wikipedia.org/wiki/Private_network)." + } + ] + }, + %{ + group: :pleroma, key: :web_cache_ttl, type: :group, description: diff --git a/docs/config.md b/docs/config.md index ed119fd32..262d15bba 100644 --- a/docs/config.md +++ b/docs/config.md @@ -730,6 +730,8 @@ This will probably take a long time. This is an advanced feature and disabled by default. +If your instance is behind a reverse proxy you must enable and configure [`Pleroma.Plugs.RemoteIp`](#pleroma-plugs-remoteip). + A keyword list of rate limiters where a key is a limiter name and value is the limiter configuration. The basic configuration is a tuple where: * The first element: `scale` (Integer). The time scale in milliseconds. @@ -756,3 +758,16 @@ Available caches: * `:activity_pub` - activity pub routes (except question activities). Defaults to `nil` (no expiration). * `:activity_pub_question` - activity pub routes (question activities). Defaults to `30_000` (30 seconds). + +## Pleroma.Plugs.RemoteIp + +**If your instance is not behind at least one reverse proxy, you should not enable this plug.** + +`Pleroma.Plugs.RemoteIp` is a shim to call [`RemoteIp`](https://git.pleroma.social/pleroma/remote_ip) but with runtime configuration. + +Available options: + +* `enabled` - Enable/disable the plug. Defaults to `false`. +* `headers` - A list of strings naming the `req_headers` to use when deriving the `remote_ip`. Order does not matter. Defaults to `~w[forwarded x-forwarded-for x-client-ip x-real-ip]`. +* `proxies` - A list of strings in [CIDR](https://en.wikipedia.org/wiki/CIDR) notation specifying the IPs of known proxies. Defaults to `[]`. +* `reserved` - Defaults to [localhost](https://en.wikipedia.org/wiki/Localhost) and [private network](https://en.wikipedia.org/wiki/Private_network). diff --git a/installation/pleroma.nginx b/installation/pleroma.nginx index 4da9918ca..7f48b614b 100644 --- a/installation/pleroma.nginx +++ b/installation/pleroma.nginx @@ -70,6 +70,7 @@ server { proxy_set_header Upgrade $http_upgrade; proxy_set_header Connection "upgrade"; proxy_set_header Host $http_host; + proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; # this is explicitly IPv4 since Pleroma.Web.Endpoint binds on IPv4 only # and `localhost.` resolves to [::0] on some systems: see issue #930 diff --git a/lib/pleroma/plugs/remote_ip.ex b/lib/pleroma/plugs/remote_ip.ex new file mode 100644 index 000000000..fdedc27ee --- /dev/null +++ b/lib/pleroma/plugs/remote_ip.ex @@ -0,0 +1,54 @@ +# Pleroma: A lightweight social networking server +# Copyright © 2017-2019 Pleroma Authors +# SPDX-License-Identifier: AGPL-3.0-only + +defmodule Pleroma.Plugs.RemoteIp do + @moduledoc """ + This is a shim to call [`RemoteIp`](https://git.pleroma.social/pleroma/remote_ip) but with runtime configuration. + """ + + @behaviour Plug + + @headers ~w[ + forwarded + x-forwarded-for + x-client-ip + x-real-ip + ] + + # https://en.wikipedia.org/wiki/Localhost + # https://en.wikipedia.org/wiki/Private_network + @reserved ~w[ + 127.0.0.0/8 + ::1/128 + fc00::/7 + 10.0.0.0/8 + 172.16.0.0/12 + 192.168.0.0/16 + ] + + def init(_), do: nil + + def call(conn, _) do + config = Pleroma.Config.get(__MODULE__, []) + + if Keyword.get(config, :enabled, false) do + RemoteIp.call(conn, remote_ip_opts(config)) + else + conn + end + end + + defp remote_ip_opts(config) do + headers = config |> Keyword.get(:headers, @headers) |> MapSet.new() + reserved = Keyword.get(config, :reserved, @reserved) + + proxies = + config + |> Keyword.get(:proxies, []) + |> Enum.concat(reserved) + |> Enum.map(&InetCidr.parse/1) + + {headers, proxies} + end +end diff --git a/lib/pleroma/web/endpoint.ex b/lib/pleroma/web/endpoint.ex index eb805e853..2212e93f4 100644 --- a/lib/pleroma/web/endpoint.ex +++ b/lib/pleroma/web/endpoint.ex @@ -97,10 +97,7 @@ defmodule Pleroma.Web.Endpoint do extra: extra ) - # Note: the plug and its configuration is compile-time this can't be upstreamed yet - if proxies = Pleroma.Config.get([__MODULE__, :reverse_proxies]) do - plug(RemoteIp, proxies: proxies) - end + plug(Pleroma.Plugs.RemoteIp) defmodule Instrumenter do use Prometheus.PhoenixInstrumenter diff --git a/mix.exs b/mix.exs index 861b94ad0..3a605b455 100644 --- a/mix.exs +++ b/mix.exs @@ -159,6 +159,9 @@ defmodule Pleroma.Mixfile do {:plug_static_index_html, "~> 1.0.0"}, {:excoveralls, "~> 0.11.1", only: :test}, {:flake_id, "~> 0.1.0"}, + {:remote_ip, + git: "https://git.pleroma.social/pleroma/remote_ip.git", + ref: "825dc00aaba5a1b7c4202a532b696b595dd3bcb3"}, {:mox, "~> 0.5", only: :test} ] ++ oauth_deps() end diff --git a/mix.lock b/mix.lock index 32443fb51..5f740638c 100644 --- a/mix.lock +++ b/mix.lock @@ -48,6 +48,7 @@ "http_signatures": {:git, "https://git.pleroma.social/pleroma/http_signatures.git", "293d77bb6f4a67ac8bde1428735c3b42f22cbb30", [ref: "293d77bb6f4a67ac8bde1428735c3b42f22cbb30"]}, "httpoison": {:hex, :httpoison, "1.2.0", "2702ed3da5fd7a8130fc34b11965c8cfa21ade2f232c00b42d96d4967c39a3a3", [:mix], [{:hackney, "~> 1.8", [hex: :hackney, repo: "hexpm", optional: false]}], "hexpm"}, "idna": {:hex, :idna, "6.0.0", "689c46cbcdf3524c44d5f3dde8001f364cd7608a99556d8fbd8239a5798d4c10", [:rebar3], [{:unicode_util_compat, "0.4.1", [hex: :unicode_util_compat, repo: "hexpm", optional: false]}], "hexpm"}, + "inet_cidr": {:hex, :inet_cidr, "1.0.4", "a05744ab7c221ca8e395c926c3919a821eb512e8f36547c062f62c4ca0cf3d6e", [:mix], [], "hexpm"}, "jason": {:hex, :jason, "1.1.2", "b03dedea67a99223a2eaf9f1264ce37154564de899fd3d8b9a21b1a6fd64afe7", [:mix], [{:decimal, "~> 1.0", [hex: :decimal, repo: "hexpm", optional: true]}], "hexpm"}, "joken": {:hex, :joken, "2.0.1", "ec9ab31bf660f343380da033b3316855197c8d4c6ef597fa3fcb451b326beb14", [:mix], [{:jose, "~> 1.9", [hex: :jose, repo: "hexpm", optional: false]}], "hexpm"}, "jose": {:hex, :jose, "1.9.0", "4167c5f6d06ffaebffd15cdb8da61a108445ef5e85ab8f5a7ad926fdf3ada154", [:mix, :rebar3], [{:base64url, "~> 0.0.1", [hex: :base64url, repo: "hexpm", optional: false]}], "hexpm"}, @@ -87,6 +88,7 @@ "quantum": {:hex, :quantum, "2.3.4", "72a0e8855e2adc101459eac8454787cb74ab4169de6ca50f670e72142d4960e9", [:mix], [{:calendar, "~> 0.17", [hex: :calendar, repo: "hexpm", optional: true]}, {:crontab, "~> 1.1", [hex: :crontab, repo: "hexpm", optional: false]}, {:gen_stage, "~> 0.12", [hex: :gen_stage, repo: "hexpm", optional: false]}, {:swarm, "~> 3.3", [hex: :swarm, repo: "hexpm", optional: false]}, {:timex, "~> 3.1", [hex: :timex, repo: "hexpm", optional: true]}], "hexpm"}, "ranch": {:hex, :ranch, "1.7.1", "6b1fab51b49196860b733a49c07604465a47bdb78aa10c1c16a3d199f7f8c881", [:rebar3], [], "hexpm"}, "recon": {:git, "https://github.com/ferd/recon.git", "75d70c7c08926d2f24f1ee6de14ee50fe8a52763", [tag: "2.4.0"]}, + "remote_ip": {:git, "https://git.pleroma.social/pleroma/remote_ip.git", "825dc00aaba5a1b7c4202a532b696b595dd3bcb3", [ref: "825dc00aaba5a1b7c4202a532b696b595dd3bcb3"]}, "ssl_verify_fun": {:hex, :ssl_verify_fun, "1.1.5", "6eaf7ad16cb568bb01753dbbd7a95ff8b91c7979482b95f38443fe2c8852a79b", [:make, :mix, :rebar3], [], "hexpm"}, "swarm": {:hex, :swarm, "3.4.0", "64f8b30055d74640d2186c66354b33b999438692a91be275bb89cdc7e401f448", [:mix], [{:gen_state_machine, "~> 2.0", [hex: :gen_state_machine, repo: "hexpm", optional: false]}, {:libring, "~> 1.0", [hex: :libring, repo: "hexpm", optional: false]}], "hexpm"}, "sweet_xml": {:hex, :sweet_xml, "0.6.6", "fc3e91ec5dd7c787b6195757fbcf0abc670cee1e4172687b45183032221b66b8", [:mix], [], "hexpm"}, diff --git a/test/plugs/remote_ip_test.exs b/test/plugs/remote_ip_test.exs new file mode 100644 index 000000000..d120c588b --- /dev/null +++ b/test/plugs/remote_ip_test.exs @@ -0,0 +1,72 @@ +# Pleroma: A lightweight social networking server +# Copyright © 2017-2019 Pleroma Authors +# SPDX-License-Identifier: AGPL-3.0-only + +defmodule Pleroma.Plugs.RemoteIpTest do + use ExUnit.Case, async: true + use Plug.Test + + alias Pleroma.Plugs.RemoteIp + + test "disabled" do + Pleroma.Config.put(RemoteIp, enabled: false) + + %{remote_ip: remote_ip} = conn(:get, "/") + + conn = + conn(:get, "/") + |> put_req_header("x-forwarded-for", "1.1.1.1") + |> RemoteIp.call(nil) + + assert conn.remote_ip == remote_ip + end + + test "enabled" do + Pleroma.Config.put(RemoteIp, enabled: true) + + conn = + conn(:get, "/") + |> put_req_header("x-forwarded-for", "1.1.1.1") + |> RemoteIp.call(nil) + + assert conn.remote_ip == {1, 1, 1, 1} + end + + test "custom headers" do + Pleroma.Config.put(RemoteIp, enabled: true, headers: ["cf-connecting-ip"]) + + conn = + conn(:get, "/") + |> put_req_header("x-forwarded-for", "1.1.1.1") + |> RemoteIp.call(nil) + + refute conn.remote_ip == {1, 1, 1, 1} + + conn = + conn(:get, "/") + |> put_req_header("cf-connecting-ip", "1.1.1.1") + |> RemoteIp.call(nil) + + assert conn.remote_ip == {1, 1, 1, 1} + end + + test "custom proxies" do + Pleroma.Config.put(RemoteIp, enabled: true) + + conn = + conn(:get, "/") + |> put_req_header("x-forwarded-for", "173.245.48.1, 1.1.1.1, 173.245.48.2") + |> RemoteIp.call(nil) + + refute conn.remote_ip == {1, 1, 1, 1} + + Pleroma.Config.put([RemoteIp, :proxies], ["173.245.48.0/20"]) + + conn = + conn(:get, "/") + |> put_req_header("x-forwarded-for", "173.245.48.1, 1.1.1.1, 173.245.48.2") + |> RemoteIp.call(nil) + + assert conn.remote_ip == {1, 1, 1, 1} + end +end