Merge branch 'simplepolicy-announce-leak' into 'develop'

SimplePolicy: filter nested objects, fixes #2582

Closes #2582

See merge request pleroma/pleroma!3376
This commit is contained in:
feld 2021-05-28 19:05:13 +00:00
commit 359ded086c
3 changed files with 48 additions and 1 deletions

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@ -33,6 +33,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
- Applying ConcurrentLimiter settings via AdminAPI
- User login failures if their `notification_settings` were in a NULL state.
- Mix task `pleroma.user delete_activities` query transaction timeout is now :infinity
- MRF (`SimplePolicy`): Embedded objects are now checked. If any embedded object would be rejected, its parent is rejected. This fixes Announces leaking posts from blocked domains.
- Fixed some Markdown issues, including trailing slash in links.
## [2.3.0] - 2020-03-01

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@ -177,6 +177,14 @@ 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}
@impl true
def filter(%{"type" => "Delete", "actor" => actor} = object) do
%{host: actor_host} = URI.parse(actor)
@ -202,7 +210,8 @@ defmodule Pleroma.Web.ActivityPub.MRF.SimplePolicy do
{:ok, object} <- check_media_nsfw(actor_info, object),
{:ok, object} <- check_ftl_removal(actor_info, object),
{:ok, object} <- check_followers_only(actor_info, object),
{:ok, object} <- check_report_removal(actor_info, object) do
{:ok, object} <- check_report_removal(actor_info, object),
{:ok, object} <- check_object(object) do
{:ok, object}
else
{:reject, nil} -> {:reject, "[SimplePolicy]"}
@ -227,6 +236,19 @@ 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}
@impl true

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@ -254,6 +254,30 @@ defmodule Pleroma.Web.ActivityPub.MRF.SimplePolicyTest do
assert {:reject, _} = SimplePolicy.filter(remote_user)
end
test "reject Announce when object would be rejected" do
clear_config([:mrf_simple, :reject], ["blocked.tld"])
announce = %{
"type" => "Announce",
"actor" => "https://okay.tld/users/alice",
"object" => %{"type" => "Note", "actor" => "https://blocked.tld/users/bob"}
}
assert {:reject, _} = SimplePolicy.filter(announce)
end
test "reject by URI object" do
clear_config([:mrf_simple, :reject], ["blocked.tld"])
announce = %{
"type" => "Announce",
"actor" => "https://okay.tld/users/alice",
"object" => "https://blocked.tld/activities/1"
}
assert {:reject, _} = SimplePolicy.filter(announce)
end
end
describe "when :followers_only" do