From 4a178b3d6589bbb9ab08e8a768cc0a3a5d5e9629 Mon Sep 17 00:00:00 2001 From: William Pitcock Date: Sat, 14 Apr 2018 09:20:18 +0000 Subject: [PATCH 1/3] ActivityPub: implement MRF core hook and baseline noop policy object --- config/config.exs | 3 ++- lib/pleroma/web/activity_pub/activity_pub.ex | 6 +++++- lib/pleroma/web/activity_pub/mrf/drop_policy.ex | 8 ++++++++ lib/pleroma/web/activity_pub/mrf/noop_policy.ex | 5 +++++ 4 files changed, 20 insertions(+), 2 deletions(-) create mode 100644 lib/pleroma/web/activity_pub/mrf/drop_policy.ex create mode 100644 lib/pleroma/web/activity_pub/mrf/noop_policy.ex diff --git a/config/config.exs b/config/config.exs index 68c054457..660ba1775 100644 --- a/config/config.exs +++ b/config/config.exs @@ -52,7 +52,8 @@ config :pleroma, :instance, limit: 5000, upload_limit: 16_000_000, registrations_open: true, - federating: true + federating: true, + rewrite_policy: Pleroma.Web.ActivityPub.MRF.NoOpPolicy config :pleroma, :media_proxy, enabled: false, diff --git a/lib/pleroma/web/activity_pub/activity_pub.ex b/lib/pleroma/web/activity_pub/activity_pub.ex index 04b50c1cc..bfb0e04be 100644 --- a/lib/pleroma/web/activity_pub/activity_pub.ex +++ b/lib/pleroma/web/activity_pub/activity_pub.ex @@ -10,6 +10,9 @@ defmodule Pleroma.Web.ActivityPub.ActivityPub do @httpoison Application.get_env(:pleroma, :httpoison) + @instance Application.get_env(:pleroma, :instance) + @rewrite_policy Keyword.get(@instance, :rewrite_policy) + def get_recipients(data) do (data["to"] || []) ++ (data["cc"] || []) end @@ -17,7 +20,8 @@ defmodule Pleroma.Web.ActivityPub.ActivityPub do def insert(map, local \\ true) when is_map(map) do with nil <- Activity.get_by_ap_id(map["id"]), map <- lazy_put_activity_defaults(map), - :ok <- insert_full_object(map) do + :ok <- insert_full_object(map), + {:ok, map} <- @rewrite_policy.filter(map) do {:ok, activity} = Repo.insert(%Activity{ data: map, diff --git a/lib/pleroma/web/activity_pub/mrf/drop_policy.ex b/lib/pleroma/web/activity_pub/mrf/drop_policy.ex new file mode 100644 index 000000000..4333bca28 --- /dev/null +++ b/lib/pleroma/web/activity_pub/mrf/drop_policy.ex @@ -0,0 +1,8 @@ +defmodule Pleroma.Web.ActivityPub.MRF.DropPolicy do + require Logger + + def filter(object) do + Logger.info("REJECTING #{inspect(object)}") + {:reject, object} + end +end diff --git a/lib/pleroma/web/activity_pub/mrf/noop_policy.ex b/lib/pleroma/web/activity_pub/mrf/noop_policy.ex new file mode 100644 index 000000000..9dd3acb04 --- /dev/null +++ b/lib/pleroma/web/activity_pub/mrf/noop_policy.ex @@ -0,0 +1,5 @@ +defmodule Pleroma.Web.ActivityPub.MRF.NoOpPolicy do + def filter(object) do + {:ok, object} + end +end From d24ddd9fb9fb5254b2e80cbe70ba9bc83f2cd0da Mon Sep 17 00:00:00 2001 From: William Pitcock Date: Sat, 14 Apr 2018 11:31:12 +0000 Subject: [PATCH 2/3] ActivityPub MRF: implement the SimplePolicy policy --- config/config.exs | 6 +++ lib/pleroma/web/activity_pub/mrf/simple_policy.ex | 65 +++++++++++++++++++++++ 2 files changed, 71 insertions(+) create mode 100644 lib/pleroma/web/activity_pub/mrf/simple_policy.ex diff --git a/config/config.exs b/config/config.exs index 660ba1775..b0f4578d5 100644 --- a/config/config.exs +++ b/config/config.exs @@ -55,6 +55,12 @@ config :pleroma, :instance, federating: true, rewrite_policy: Pleroma.Web.ActivityPub.MRF.NoOpPolicy +config :pleroma, :mrf_simple, + media_removal: [], + media_nsfw: [], + federated_timeline_removal: [], + reject: [] + config :pleroma, :media_proxy, enabled: false, redirect_on_failure: true diff --git a/lib/pleroma/web/activity_pub/mrf/simple_policy.ex b/lib/pleroma/web/activity_pub/mrf/simple_policy.ex new file mode 100644 index 000000000..1322744f1 --- /dev/null +++ b/lib/pleroma/web/activity_pub/mrf/simple_policy.ex @@ -0,0 +1,65 @@ +defmodule Pleroma.Web.ActivityPub.MRF.SimplePolicy do + alias Pleroma.User + + @mrf_policy Application.get_env(:pleroma, :mrf_simple) + + @reject Keyword.get(@mrf_policy, :reject) + defp check_reject(actor_info, object) do + if actor_info.host in @reject do + {:reject, nil} + else + {:ok, object} + end + end + + @media_removal Keyword.get(@mrf_policy, :media_removal) + defp check_media_removal(actor_info, object) do + if actor_info.host in @media_removal do + object = Map.delete(object, "attachments") + end + + {:ok, object} + end + + @media_nsfw Keyword.get(@mrf_policy, :media_nsfw) + defp check_media_nsfw(actor_info, object) do + if actor_info.host in @media_nsfw and object["attachment"] != nil and length(object["attachment"]) > 0 do + tags = (object["tag"] || []) ++ ["nsfw"] + object = Map.put(object, "tags", tags) + object = Map.put(object, "sensitive", true) + end + + {:ok, object} + end + + @ftl_removal Keyword.get(@mrf_policy, :federated_timeline_removal) + defp check_ftl_removal(actor_info, object) do + if actor_info.host in @ftl_removal do + user = User.get_by_ap_id(object["actor"]) + + # flip to/cc relationship to make the post unlisted + if "https://www.w3.org/ns/activitystreams#Public" in object["to"] and user.follower_address in object["cc"] do + to = List.delete(object["to"], "https://www.w3.org/ns/activitystreams#Public") ++ [user.follower_address] + cc = List.delete(object["cc"], user.follower_address) ++ ["https://www.w3.org/ns/activitystreams#Public"] + + object = Map.put(object, "to", to) + object = Map.put(object, "cc", cc) + end + end + + {:ok, object} + end + + def filter(object) do + actor_info = URI.parse(object["actor"]) + + with {:ok, object} <- check_reject(actor_info, object), + {:ok, object} <- check_media_removal(actor_info, object), + {:ok, object} <- check_media_nsfw(actor_info, object), + {:ok, object} <- check_ftl_removal(actor_info, object) do + {:ok, object} + else + e -> {:reject, nil} + end + end +end From f08f9d449811d7a67b5c901889b0fef2e9ab8da9 Mon Sep 17 00:00:00 2001 From: "nenolod@dereferenced.org" Date: Thu, 19 Apr 2018 12:29:35 +0000 Subject: [PATCH 3/3] ActivityPub MRF: fix nsfw tagging of objects with attachments by looking at the right object (the child in this case) --- lib/pleroma/web/activity_pub/mrf/simple_policy.ex | 10 ++++++---- 1 file changed, 6 insertions(+), 4 deletions(-) diff --git a/lib/pleroma/web/activity_pub/mrf/simple_policy.ex b/lib/pleroma/web/activity_pub/mrf/simple_policy.ex index 1322744f1..cb8eaf1ec 100644 --- a/lib/pleroma/web/activity_pub/mrf/simple_policy.ex +++ b/lib/pleroma/web/activity_pub/mrf/simple_policy.ex @@ -23,10 +23,12 @@ defmodule Pleroma.Web.ActivityPub.MRF.SimplePolicy do @media_nsfw Keyword.get(@mrf_policy, :media_nsfw) defp check_media_nsfw(actor_info, object) do - if actor_info.host in @media_nsfw and object["attachment"] != nil and length(object["attachment"]) > 0 do - tags = (object["tag"] || []) ++ ["nsfw"] - object = Map.put(object, "tags", tags) - object = Map.put(object, "sensitive", true) + child_object = object["object"] + if actor_info.host in @media_nsfw and child_object["attachment"] != nil and length(child_object["attachment"]) > 0 do + tags = (child_object["tag"] || []) ++ ["nsfw"] + child_object = Map.put(child_object, "tags", tags) + child_object = Map.put(child_object, "sensitive", true) + object = Map.put(object, "object", child_object) end {:ok, object}