implement anti link spam MRF

This commit is contained in:
William Pitcock 2019-06-19 15:57:44 +00:00
parent cb4fcc740c
commit 736d8ad6be
4 changed files with 168 additions and 0 deletions

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@ -62,6 +62,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
- MRF: Support for running subchains.
- Configuration: `skip_thread_containment` option
- Configuration: `rate_limit` option. See `Pleroma.Plugs.RateLimiter` documentation for details.
- MRF: Support for filtering out likely spam messages using naive heuristics.
### Changed
- **Breaking:** Configuration: move from Pleroma.Mailer to Pleroma.Emails.Mailer

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@ -90,6 +90,7 @@ config :pleroma, Pleroma.Emails.Mailer,
* `Pleroma.Web.ActivityPub.MRF.SubchainPolicy`: Selectively runs other MRF policies when messages match (see ``:mrf_subchain`` section)
* `Pleroma.Web.ActivityPub.MRF.RejectNonPublic`: Drops posts with non-public visibility settings (See ``:mrf_rejectnonpublic`` section)
* `Pleroma.Web.ActivityPub.MRF.EnsureRePrepended`: Rewrites posts to ensure that replies to posts with subjects do not have an identical subject and instead begin with re:.
* `Pleroma.Web.ActivityPub.MRF.AntiLinkSpamPolicy`: Rejects posts from likely spambots using naive heuristics.
* `public`: Makes the client API in authentificated mode-only except for user-profiles. Useful for disabling the Local Timeline and The Whole Known Network.
* `quarantined_instances`: List of ActivityPub instances where private(DMs, followers-only) activities will not be send.
* `managed_config`: Whenether the config for pleroma-fe is configured in this config or in ``static/config.json``

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@ -0,0 +1,46 @@
# Pleroma: A lightweight social networking server
# Copyright © 2019 Pleroma Authors <https://pleroma.social/>
# SPDX-License-Identifier: AGPL-3.0-only
defmodule Pleroma.Web.ActivityPub.MRF.AntiLinkSpamPolicy do
alias Pleroma.User
require Logger
# has the user successfully posted before?
defp user_has_posted_before?(%User{} = u) do
u.info.note_count > 0 || u.info.follower_count > 0
end
# does the post contain links?
defp contains_links?(%{"content" => content} = _object) do
content
|> Floki.filter_out("a.mention,a.hashtag,a[rel~=\"tag\"],a.zrl")
|> Floki.attribute("a", "href")
|> length() > 0
end
def filter(%{"type" => "Create", "actor" => actor, "object" => object} = message) do
with {:ok, %User{} = u} <- User.get_or_fetch_by_ap_id(actor),
{:contains_links, true} <- {:contains_links, contains_links?(object)},
{:posted_before, true} <- {:posted_before, user_has_posted_before?(u)} do
{:ok, message}
else
{:contains_links, false} ->
{:ok, message}
{:posted_before, false} ->
{:reject, nil}
{:error, _} ->
{:reject, nil}
e ->
Logger.warn("[MRF anti-link-spam] WTF: unhandled error #{inspect(e)}")
{:reject, nil}
end
end
# in all other cases, pass through
def filter(message), do: {:ok, message}
end

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@ -0,0 +1,120 @@
# Pleroma: A lightweight social networking server
# Copyright © 2019 Pleroma Authors <https://pleroma.social/>
# SPDX-License-Identifier: AGPL-3.0-only
defmodule Pleroma.Web.ActivityPub.MRF.AntiLinkSpamPolicyTest do
use Pleroma.DataCase
import Pleroma.Factory
alias Pleroma.Web.ActivityPub.MRF.AntiLinkSpamPolicy
@linkless_message %{
"type" => "Create",
"object" => %{
"content" => "hi world!"
}
}
@linkful_message %{
"type" => "Create",
"object" => %{
"content" => "<a href='https://example.com'>hi world!</a>"
}
}
describe "with new user" do
test "it allows posts without links" do
user = insert(:user)
assert user.info.note_count == 0
message =
@linkless_message
|> Map.put("actor", user.ap_id)
{:ok, _message} = AntiLinkSpamPolicy.filter(message)
end
test "it disallows posts with links" do
user = insert(:user)
assert user.info.note_count == 0
message =
@linkful_message
|> Map.put("actor", user.ap_id)
{:reject, _} = AntiLinkSpamPolicy.filter(message)
end
end
describe "with old user" do
test "it allows posts without links" do
user = insert(:user, info: %{note_count: 1})
assert user.info.note_count == 1
message =
@linkless_message
|> Map.put("actor", user.ap_id)
{:ok, _message} = AntiLinkSpamPolicy.filter(message)
end
test "it allows posts with links" do
user = insert(:user, info: %{note_count: 1})
assert user.info.note_count == 1
message =
@linkful_message
|> Map.put("actor", user.ap_id)
{:ok, _message} = AntiLinkSpamPolicy.filter(message)
end
end
describe "with followed new user" do
test "it allows posts without links" do
user = insert(:user, info: %{follower_count: 1})
assert user.info.follower_count == 1
message =
@linkless_message
|> Map.put("actor", user.ap_id)
{:ok, _message} = AntiLinkSpamPolicy.filter(message)
end
test "it allows posts with links" do
user = insert(:user, info: %{follower_count: 1})
assert user.info.follower_count == 1
message =
@linkful_message
|> Map.put("actor", user.ap_id)
{:ok, _message} = AntiLinkSpamPolicy.filter(message)
end
end
describe "with unknown actors" do
test "it rejects posts without links" do
message =
@linkless_message
|> Map.put("actor", "http://invalid.actor")
{:reject, _} = AntiLinkSpamPolicy.filter(message)
end
test "it rejects posts with links" do
message =
@linkful_message
|> Map.put("actor", "http://invalid.actor")
{:reject, _} = AntiLinkSpamPolicy.filter(message)
end
end
end