X-Git-Url: http://git.squeep.com/?a=blobdiff_plain;f=lib%2Fpleroma%2Fweb%2Factivity_pub%2Fmrf%2Fsimple_policy.ex;h=62024c58c90929f9073ef72f00db9e2d0953ac5b;hb=d7c805b0bb59f57f336e610a7e362f6d17c42474;hp=b77b8c7b49eb2254d9fe3612d61d616f819bd214;hpb=992deaa09bea1ed30f5a0e8bc357e27e4fd45be4;p=akkoma

diff --git a/lib/pleroma/web/activity_pub/mrf/simple_policy.ex b/lib/pleroma/web/activity_pub/mrf/simple_policy.ex
index b77b8c7b4..415c5d2dd 100644
--- a/lib/pleroma/web/activity_pub/mrf/simple_policy.ex
+++ b/lib/pleroma/web/activity_pub/mrf/simple_policy.ex
@@ -1,12 +1,13 @@
 # Pleroma: A lightweight social networking server
-# Copyright © 2017-2020 Pleroma Authors <https://pleroma.social/>
+# Copyright © 2017-2021 Pleroma Authors <https://pleroma.social/>
 # SPDX-License-Identifier: AGPL-3.0-only
 
 defmodule Pleroma.Web.ActivityPub.MRF.SimplePolicy do
   @moduledoc "Filter activities depending on their origin instance"
-  @behaviour Pleroma.Web.ActivityPub.MRF
+  @behaviour Pleroma.Web.ActivityPub.MRF.Policy
 
   alias Pleroma.Config
+  alias Pleroma.FollowingRelationship
   alias Pleroma.User
   alias Pleroma.Web.ActivityPub.MRF
 
@@ -14,7 +15,7 @@ defmodule Pleroma.Web.ActivityPub.MRF.SimplePolicy do
 
   defp check_accept(%{host: actor_host} = _actor_info, object) do
     accepts =
-      Config.get([:mrf_simple, :accept])
+      instance_list(:accept)
       |> MRF.subdomains_regex()
 
     cond do
@@ -27,7 +28,7 @@ defmodule Pleroma.Web.ActivityPub.MRF.SimplePolicy do
 
   defp check_reject(%{host: actor_host} = _actor_info, object) do
     rejects =
-      Config.get([:mrf_simple, :reject])
+      instance_list(:reject)
       |> MRF.subdomains_regex()
 
     if MRF.subdomain_match?(rejects, actor_host) do
@@ -43,7 +44,7 @@ defmodule Pleroma.Web.ActivityPub.MRF.SimplePolicy do
        )
        when length(child_attachment) > 0 do
     media_removal =
-      Config.get([:mrf_simple, :media_removal])
+      instance_list(:media_removal)
       |> MRF.subdomains_regex()
 
     object =
@@ -63,19 +64,16 @@ defmodule Pleroma.Web.ActivityPub.MRF.SimplePolicy do
          %{host: actor_host} = _actor_info,
          %{
            "type" => "Create",
-           "object" => child_object
+           "object" => %{} = _child_object
          } = object
        ) do
     media_nsfw =
-      Config.get([:mrf_simple, :media_nsfw])
+      instance_list(:media_nsfw)
       |> MRF.subdomains_regex()
 
     object =
       if MRF.subdomain_match?(media_nsfw, actor_host) do
-        tags = (child_object["tag"] || []) ++ ["nsfw"]
-        child_object = Map.put(child_object, "tag", tags)
-        child_object = Map.put(child_object, "sensitive", true)
-        Map.put(object, "object", child_object)
+        Kernel.put_in(object, ["object", "sensitive"], true)
       else
         object
       end
@@ -87,7 +85,7 @@ defmodule Pleroma.Web.ActivityPub.MRF.SimplePolicy do
 
   defp check_ftl_removal(%{host: actor_host} = _actor_info, object) do
     timeline_removal =
-      Config.get([:mrf_simple, :federated_timeline_removal])
+      instance_list(:federated_timeline_removal)
       |> MRF.subdomains_regex()
 
     object =
@@ -108,9 +106,38 @@ defmodule Pleroma.Web.ActivityPub.MRF.SimplePolicy do
     {:ok, object}
   end
 
+  defp intersection(list1, list2) do
+    list1 -- list1 -- list2
+  end
+
+  defp check_followers_only(%{host: actor_host} = _actor_info, object) do
+    followers_only =
+      instance_list(:followers_only)
+      |> MRF.subdomains_regex()
+
+    object =
+      with true <- MRF.subdomain_match?(followers_only, actor_host),
+           user <- User.get_cached_by_ap_id(object["actor"]) do
+        # Don't use Map.get/3 intentionally, these must not be nil
+        fixed_to = object["to"] || []
+        fixed_cc = object["cc"] || []
+
+        to = FollowingRelationship.followers_ap_ids(user, fixed_to)
+        cc = FollowingRelationship.followers_ap_ids(user, fixed_cc)
+
+        object
+        |> Map.put("to", intersection([user.follower_address | to], fixed_to))
+        |> Map.put("cc", intersection([user.follower_address | cc], fixed_cc))
+      else
+        _ -> object
+      end
+
+    {:ok, object}
+  end
+
   defp check_report_removal(%{host: actor_host} = _actor_info, %{"type" => "Flag"} = object) do
     report_removal =
-      Config.get([:mrf_simple, :report_removal])
+      instance_list(:report_removal)
       |> MRF.subdomains_regex()
 
     if MRF.subdomain_match?(report_removal, actor_host) do
@@ -124,7 +151,7 @@ defmodule Pleroma.Web.ActivityPub.MRF.SimplePolicy do
 
   defp check_avatar_removal(%{host: actor_host} = _actor_info, %{"icon" => _icon} = object) do
     avatar_removal =
-      Config.get([:mrf_simple, :avatar_removal])
+      instance_list(:avatar_removal)
       |> MRF.subdomains_regex()
 
     if MRF.subdomain_match?(avatar_removal, actor_host) do
@@ -138,7 +165,7 @@ defmodule Pleroma.Web.ActivityPub.MRF.SimplePolicy do
 
   defp check_banner_removal(%{host: actor_host} = _actor_info, %{"image" => _image} = object) do
     banner_removal =
-      Config.get([:mrf_simple, :banner_removal])
+      instance_list(:banner_removal)
       |> MRF.subdomains_regex()
 
     if MRF.subdomain_match?(banner_removal, actor_host) do
@@ -150,12 +177,25 @@ defmodule Pleroma.Web.ActivityPub.MRF.SimplePolicy do
 
   defp check_banner_removal(_actor_info, object), do: {:ok, object}
 
+  defp check_object(%{"object" => object} = activity) do
+    with {:ok, _object} <- filter(object) do
+      {:ok, activity}
+    end
+  end
+
+  defp check_object(object), do: {:ok, object}
+
+  defp instance_list(config_key) do
+    Config.get([:mrf_simple, config_key])
+    |> MRF.instance_list_from_tuples()
+  end
+
   @impl true
   def filter(%{"type" => "Delete", "actor" => actor} = object) do
     %{host: actor_host} = URI.parse(actor)
 
     reject_deletes =
-      Config.get([:mrf_simple, :reject_deletes])
+      instance_list(:reject_deletes)
       |> MRF.subdomains_regex()
 
     if MRF.subdomain_match?(reject_deletes, actor_host) do
@@ -174,7 +214,9 @@ defmodule Pleroma.Web.ActivityPub.MRF.SimplePolicy do
          {:ok, object} <- check_media_removal(actor_info, object),
          {:ok, object} <- check_media_nsfw(actor_info, object),
          {:ok, object} <- check_ftl_removal(actor_info, object),
-         {:ok, object} <- check_report_removal(actor_info, object) do
+         {:ok, object} <- check_followers_only(actor_info, object),
+         {:ok, object} <- check_report_removal(actor_info, object),
+         {:ok, object} <- check_object(object) do
       {:ok, object}
     else
       {:reject, nil} -> {:reject, "[SimplePolicy]"}
@@ -199,17 +241,156 @@ defmodule Pleroma.Web.ActivityPub.MRF.SimplePolicy do
     end
   end
 
+  def filter(object) when is_binary(object) do
+    uri = URI.parse(object)
+
+    with {:ok, object} <- check_accept(uri, object),
+         {:ok, object} <- check_reject(uri, object) do
+      {:ok, object}
+    else
+      {:reject, nil} -> {:reject, "[SimplePolicy]"}
+      {:reject, _} = e -> e
+      _ -> {:reject, "[SimplePolicy]"}
+    end
+  end
+
   def filter(object), do: {:ok, object}
 
+  defp obfuscate(string) when is_binary(string) do
+    string
+    |> to_charlist()
+    |> Enum.with_index()
+    |> Enum.map(fn
+      {?., _index} ->
+        ?.
+
+      {char, index} ->
+        if 3 <= index && index < String.length(string) - 3, do: ?*, else: char
+    end)
+    |> to_string()
+  end
+
+  defp maybe_obfuscate(host, obfuscations) do
+    if MRF.subdomain_match?(obfuscations, host) do
+      obfuscate(host)
+    else
+      host
+    end
+  end
+
   @impl true
   def describe do
-    exclusions = Config.get([:mrf, :transparency_exclusions])
+    exclusions = Config.get([:mrf, :transparency_exclusions]) |> MRF.instance_list_from_tuples()
 
-    mrf_simple =
+    obfuscations =
+      Config.get([:mrf, :transparency_obfuscate_domains], []) |> MRF.subdomains_regex()
+
+    mrf_simple_excluded =
       Config.get(:mrf_simple)
-      |> Enum.map(fn {k, v} -> {k, Enum.reject(v, fn v -> v in exclusions end)} end)
-      |> Enum.into(%{})
+      |> Enum.map(fn {rule, instances} ->
+        {rule, Enum.reject(instances, fn {host, _} -> host in exclusions end)}
+      end)
 
-    {:ok, %{mrf_simple: mrf_simple}}
+    mrf_simple =
+      mrf_simple_excluded
+      |> Enum.map(fn {rule, instances} ->
+        {rule, Enum.map(instances, fn {host, _} -> maybe_obfuscate(host, obfuscations) end)}
+      end)
+      |> Map.new()
+
+    # This is for backwards compatibility. We originally didn't sent
+    # extra info like a reason why an instance was rejected/quarantined/etc.
+    # Because we didn't want to break backwards compatibility it was decided
+    # to add an extra "info" key.
+    mrf_simple_info =
+      mrf_simple_excluded
+      |> Enum.map(fn {rule, instances} ->
+        {rule, Enum.reject(instances, fn {_, reason} -> reason == "" end)}
+      end)
+      |> Enum.reject(fn {_, instances} -> instances == [] end)
+      |> Enum.map(fn {rule, instances} ->
+        instances =
+          instances
+          |> Enum.map(fn {host, reason} ->
+            {maybe_obfuscate(host, obfuscations), %{"reason" => reason}}
+          end)
+          |> Map.new()
+
+        {rule, instances}
+      end)
+      |> Map.new()
+
+    {:ok, %{mrf_simple: mrf_simple, mrf_simple_info: mrf_simple_info}}
+  end
+
+  @impl true
+  def config_description do
+    %{
+      key: :mrf_simple,
+      related_policy: "Pleroma.Web.ActivityPub.MRF.SimplePolicy",
+      label: "MRF Simple",
+      description: "Simple ingress policies",
+      children:
+        [
+          %{
+            key: :media_removal,
+            description:
+              "List of instances to strip media attachments from and the reason for doing so"
+          },
+          %{
+            key: :media_nsfw,
+            label: "Media NSFW",
+            description:
+              "List of instances to tag all media as NSFW (sensitive) from and the reason for doing so"
+          },
+          %{
+            key: :federated_timeline_removal,
+            description:
+              "List of instances to remove from the Federated (aka The Whole Known Network) Timeline and the reason for doing so"
+          },
+          %{
+            key: :reject,
+            description:
+              "List of instances to reject activities from (except deletes) and the reason for doing so"
+          },
+          %{
+            key: :accept,
+            description:
+              "List of instances to only accept activities from (except deletes) and the reason for doing so"
+          },
+          %{
+            key: :followers_only,
+            description:
+              "Force posts from the given instances to be visible by followers only and the reason for doing so"
+          },
+          %{
+            key: :report_removal,
+            description: "List of instances to reject reports from and the reason for doing so"
+          },
+          %{
+            key: :avatar_removal,
+            description: "List of instances to strip avatars from and the reason for doing so"
+          },
+          %{
+            key: :banner_removal,
+            description: "List of instances to strip banners from and the reason for doing so"
+          },
+          %{
+            key: :reject_deletes,
+            description: "List of instances to reject deletions from and the reason for doing so"
+          }
+        ]
+        |> Enum.map(fn setting ->
+          Map.merge(
+            setting,
+            %{
+              type: {:list, :tuple},
+              key_placeholder: "instance",
+              value_placeholder: "reason",
+              suggestions: [{"example.com", "Some reason"}, {"*.example.com", "Another reason"}]
+            }
+          )
+        end)
+    }
   end
 end