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Remove spam check and dependency on nilsimsa gem (#16011)

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Eugen Rochko 2021-04-11 11:22:50 +02:00 committed by GitHub
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1
Gemfile
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@ -62,7 +62,6 @@ gem 'idn-ruby', require: 'idn'
gem 'kaminari', '~> 1.2'
gem 'link_header', '~> 0.0'
gem 'mime-types', '~> 3.3.1', require: 'mime/types/columnar'
gem 'nilsimsa', git: 'https://github.com/witgo/nilsimsa', ref: 'fd184883048b922b176939f851338d0a4971a532'
gem 'nokogiri', '~> 1.11'
gem 'nsa', git: 'https://github.com/Gargron/nsa', ref: 'd1079e0cdafdfed7f9f35478d13b9bdaa65965c0'
gem 'oj', '~> 3.11'

8
Gemfile.lock
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@ -18,13 +18,6 @@ GIT
activerecord (>= 6.1.0)
activesupport (>= 6.1.0)
GIT
remote: https://github.com/witgo/nilsimsa
revision: fd184883048b922b176939f851338d0a4971a532
ref: fd184883048b922b176939f851338d0a4971a532
specs:
nilsimsa (1.1.2)
GEM
remote: https://rubygems.org/
specs:
@ -762,7 +755,6 @@ DEPENDENCIES
microformats (~> 4.2)
mime-types (~> 3.3.1)
net-ldap (~> 0.17)
nilsimsa!
nokogiri (~> 1.11)
nsa!
oj (~> 3.11)

1
app/controllers/admin/dashboard_controller.rb
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@ -35,7 +35,6 @@ module Admin
@whitelist_enabled = whitelist_mode?
@profile_directory = Setting.profile_directory
@timeline_preview = Setting.timeline_preview
@spam_check_enabled = Setting.spam_check_enabled
@trends_enabled = Setting.trends
end

5
app/lib/activitypub/activity/create.rb
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@ -88,7 +88,6 @@ class ActivityPub::Activity::Create < ActivityPub::Activity
resolve_thread(@status)
fetch_replies(@status)
check_for_spam
distribute(@status)
forward_for_reply
end
@ -492,10 +491,6 @@ class ActivityPub::Activity::Create < ActivityPub::Activity
Tombstone.exists?(uri: object_uri)
end
def check_for_spam
SpamCheck.perform(@status)
end
def forward_for_reply
return unless @status.distributable? && @json['signature'].present? && reply_to_local?

198
app/lib/spam_check.rb
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@ -1,198 +0,0 @@
# frozen_string_literal: true
class SpamCheck
include Redisable
include ActionView::Helpers::TextHelper
# Threshold over which two Nilsimsa values are considered
# to refer to the same text
NILSIMSA_COMPARE_THRESHOLD = 95
# Nilsimsa doesn't work well on small inputs, so below
# this size, we check only for exact matches with MD5
NILSIMSA_MIN_SIZE = 10
# How long to keep the trail of digests between updates,
# there is no reason to store it forever
EXPIRE_SET_AFTER = 1.week.seconds
# How many digests to keep in an account's trail. If it's
# too small, spam could rotate around different message templates
MAX_TRAIL_SIZE = 10
# How many detected duplicates to allow through before
# considering the message as spam
THRESHOLD = 5
def initialize(status)
@account = status.account
@status = status
end
def skip?
disabled? || already_flagged? || trusted? || no_unsolicited_mentions? || solicited_reply?
end
def spam?
if insufficient_data?
false
elsif nilsimsa?
digests_over_threshold?('nilsimsa') { |_, other_digest| nilsimsa_compare_value(digest, other_digest) >= NILSIMSA_COMPARE_THRESHOLD }
else
digests_over_threshold?('md5') { |_, other_digest| other_digest == digest }
end
end
def flag!
auto_report_status!
end
def remember!
# The scores in sorted sets don't actually have enough bits to hold an exact
# value of our snowflake IDs, so we use it only for its ordering property. To
# get the correct status ID back, we have to save it in the string value
redis.zadd(redis_key, @status.id, digest_with_algorithm)
redis.zremrangebyrank(redis_key, 0, -(MAX_TRAIL_SIZE + 1))
redis.expire(redis_key, EXPIRE_SET_AFTER)
end
def reset!
redis.del(redis_key)
end
def hashable_text
return @hashable_text if defined?(@hashable_text)
@hashable_text = @status.text
@hashable_text = remove_mentions(@hashable_text)
@hashable_text = strip_tags(@hashable_text) unless @status.local?
@hashable_text = normalize_unicode(@status.spoiler_text + ' ' + @hashable_text)
@hashable_text = remove_whitespace(@hashable_text)
end
def insufficient_data?
hashable_text.blank?
end
def digest
@digest ||= begin
if nilsimsa?
Nilsimsa.new(hashable_text).hexdigest
else
Digest::MD5.hexdigest(hashable_text)
end
end
end
def digest_with_algorithm
if nilsimsa?
['nilsimsa', digest, @status.id].join(':')
else
['md5', digest, @status.id].join(':')
end
end
class << self
def perform(status)
spam_check = new(status)
return if spam_check.skip?
if spam_check.spam?
spam_check.flag!
else
spam_check.remember!
end
end
end
private
def disabled?
!Setting.spam_check_enabled
end
def remove_mentions(text)
return text.gsub(Account::MENTION_RE, '') if @status.local?
Nokogiri::HTML.fragment(text).tap do |html|
mentions = @status.mentions.map { |mention| ActivityPub::TagManager.instance.url_for(mention.account) }
html.traverse do |element|
element.unlink if element.name == 'a' && mentions.include?(element['href'])
end
end.to_s
end
def normalize_unicode(text)
text.unicode_normalize(:nfkc).downcase
end
def remove_whitespace(text)
text.gsub(/\s+/, ' ').strip
end
def auto_report_status!
status_ids = Status.where(visibility: %i(public unlisted)).where(id: matching_status_ids).pluck(:id) + [@status.id] if @status.distributable?
ReportService.new.call(Account.representative, @account, status_ids: status_ids, comment: I18n.t('spam_check.spam_detected'))
end
def already_flagged?
@account.silenced? || @account.targeted_reports.unresolved.where(account_id: -99).exists?
end
def trusted?
@account.trust_level > Account::TRUST_LEVELS[:untrusted] || (@account.local? && @account.user_staff?)
end
def no_unsolicited_mentions?
@status.mentions.all? { |mention| mention.silent? || (!@account.local? && !mention.account.local?) || mention.account.following?(@account) }
end
def solicited_reply?
!@status.thread.nil? && @status.thread.mentions.where(account: @account).exists?
end
def nilsimsa_compare_value(first, second)
first = [first].pack('H*')
second = [second].pack('H*')
bits = 0
0.upto(31) do |i|
bits += Nilsimsa::POPC[255 & (first[i].ord ^ second[i].ord)].ord
end
128 - bits # -128 <= Nilsimsa Compare Value <= 128
end
def nilsimsa?
hashable_text.size > NILSIMSA_MIN_SIZE
end
def other_digests
redis.zrange(redis_key, 0, -1)
end
def digests_over_threshold?(filter_algorithm)
other_digests.select do |record|
algorithm, other_digest, status_id = record.split(':')
next unless algorithm == filter_algorithm
yield algorithm, other_digest, status_id
end.size >= THRESHOLD
end
def matching_status_ids
if nilsimsa?
other_digests.filter_map { |record| record.split(':')[2] if record.start_with?('nilsimsa') && nilsimsa_compare_value(digest, record.split(':')[1]) >= NILSIMSA_COMPARE_THRESHOLD }
else
other_digests.filter_map { |record| record.split(':')[2] if record.start_with?('md5') && record.split(':')[1] == digest }
end
end
def redis_key
@redis_key ||= "spam_check:#{@account.id}"
end
end

2
app/models/form/admin_settings.rb
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@ -29,7 +29,6 @@ class Form::AdminSettings
thumbnail
hero
mascot
spam_check_enabled
trends
trendable_by_default
show_domain_blocks
@ -48,7 +47,6 @@ class Form::AdminSettings
show_known_fediverse_at_about_page
preview_sensitive_media
profile_directory
spam_check_enabled
trends
trendable_by_default
noindex

5
app/services/process_mentions_service.rb
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@ -43,7 +43,6 @@ class ProcessMentionsService < BaseService
end
status.save!
check_for_spam(status)
mentions.each { |mention| create_notification(mention) }
end
@ -72,8 +71,4 @@ class ProcessMentionsService < BaseService
def resolve_account_service
ResolveAccountService.new
end
def check_for_spam(status)
SpamCheck.perform(status)
end
end

5
app/services/remove_status_service.rb
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@ -41,7 +41,6 @@ class RemoveStatusService < BaseService
remove_from_hashtags
remove_from_public
remove_from_media if @status.media_attachments.any?
remove_from_spam_check
remove_media
end
@ -163,10 +162,6 @@ class RemoveStatusService < BaseService
@status.media_attachments.destroy_all
end
def remove_from_spam_check
redis.zremrangebyscore("spam_check:#{@status.account_id}", @status.id, @status.id)
end
def lock_options
{ redis: Redis.current, key: "distribute:#{@status.id}" }
end

2
app/views/admin/dashboard/index.html.haml
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@ -77,8 +77,6 @@
= feature_hint(link_to(t('admin.dashboard.trends'), edit_admin_settings_path), @trends_enabled)
%li
= feature_hint(link_to(t('admin.dashboard.feature_relay'), admin_relays_path), @relay_enabled)
%li
= feature_hint(link_to(t('admin.dashboard.feature_spam_check'), edit_admin_settings_path), @spam_check_enabled)
.dashboard__widgets__versions
%div

3
app/views/admin/settings/edit.html.haml
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@ -92,9 +92,6 @@
.fields-group
= f.input :noindex, as: :boolean, wrapper: :with_label, label: t('admin.settings.default_noindex.title'), hint: t('admin.settings.default_noindex.desc_html')
.fields-group
= f.input :spam_check_enabled, as: :boolean, wrapper: :with_label, label: t('admin.settings.spam_check_enabled.title'), hint: t('admin.settings.spam_check_enabled.desc_html')
%hr.spacer/
.fields-group

6
config/locales/en.yml
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@ -363,7 +363,6 @@ en:
feature_profile_directory: Profile directory
feature_registrations: Registrations
feature_relay: Federation relay
feature_spam_check: Anti-spam
feature_timeline_preview: Timeline preview
features: Features
hidden_service: Federation with hidden services
@ -627,9 +626,6 @@ en:
desc_html: You can write your own privacy policy, terms of service or other legalese. You can use HTML tags
title: Custom terms of service
site_title: Server name
spam_check_enabled:
desc_html: Mastodon can auto-report accounts that send repeated unsolicited messages. There may be false positives.
title: Anti-spam automation
thumbnail:
desc_html: Used for previews via OpenGraph and API. 1200x630px recommended
title: Server thumbnail
@ -1209,8 +1205,6 @@ en:
relationships: Follows and followers
two_factor_authentication: Two-factor Auth
webauthn_authentication: Security keys
spam_check:
spam_detected: This is an automated report. Spam has been detected.
statuses:
attached:
audio:

1
config/settings.yml
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@ -67,7 +67,6 @@ defaults: &defaults
activity_api_enabled: true
peers_api_enabled: true
show_known_fediverse_at_about_page: true
spam_check_enabled: true
show_domain_blocks: 'disabled'
show_domain_blocks_rationale: 'disabled'
require_invite_text: false

192
spec/lib/spam_check_spec.rb
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@ -1,192 +0,0 @@
# frozen_string_literal: true
require 'rails_helper'
RSpec.describe SpamCheck do
let!(:sender) { Fabricate(:account) }
let!(:alice) { Fabricate(:account, username: 'alice') }
let!(:bob) { Fabricate(:account, username: 'bob') }
def status_with_html(text, options = {})
status = PostStatusService.new.call(sender, { text: text }.merge(options))
status.update_columns(text: Formatter.instance.format(status), local: false)
status
end
describe '#hashable_text' do
it 'removes mentions from HTML for remote statuses' do
status = status_with_html('@alice Hello')
expect(described_class.new(status).hashable_text).to eq 'hello'
end
it 'removes mentions from text for local statuses' do
status = PostStatusService.new.call(alice, text: "Hey @#{sender.username}, how are you?")
expect(described_class.new(status).hashable_text).to eq 'hey , how are you?'
end
end
describe '#insufficient_data?' do
it 'returns true when there is no text' do
status = status_with_html('@alice')
expect(described_class.new(status).insufficient_data?).to be true
end
it 'returns false when there is text' do
status = status_with_html('@alice h')
expect(described_class.new(status).insufficient_data?).to be false
end
end
describe '#digest' do
it 'returns a string' do
status = status_with_html('@alice Hello world')
expect(described_class.new(status).digest).to be_a String
end
end
describe '#spam?' do
it 'returns false for a unique status' do
status = status_with_html('@alice Hello')
expect(described_class.new(status).spam?).to be false
end
it 'returns false for different statuses to the same recipient' do
status1 = status_with_html('@alice Hello')
described_class.new(status1).remember!
status2 = status_with_html('@alice Are you available to talk?')
expect(described_class.new(status2).spam?).to be false
end
it 'returns false for statuses with different content warnings' do
status1 = status_with_html('@alice Are you available to talk?')
described_class.new(status1).remember!
status2 = status_with_html('@alice Are you available to talk?', spoiler_text: 'This is a completely different matter than what I was talking about previously, I swear!')
expect(described_class.new(status2).spam?).to be false
end
it 'returns false for different statuses to different recipients' do
status1 = status_with_html('@alice How is it going?')
described_class.new(status1).remember!
status2 = status_with_html('@bob Are you okay?')
expect(described_class.new(status2).spam?).to be false
end
it 'returns false for very short different statuses to different recipients' do
status1 = status_with_html('@alice 🙄')
described_class.new(status1).remember!
status2 = status_with_html('@bob Huh?')
expect(described_class.new(status2).spam?).to be false
end
it 'returns false for statuses with no text' do
status1 = status_with_html('@alice')
described_class.new(status1).remember!
status2 = status_with_html('@bob')
expect(described_class.new(status2).spam?).to be false
end
it 'returns true for duplicate statuses to the same recipient' do
described_class::THRESHOLD.times do
status1 = status_with_html('@alice Hello')
described_class.new(status1).remember!
end
status2 = status_with_html('@alice Hello')
expect(described_class.new(status2).spam?).to be true
end
it 'returns true for duplicate statuses to different recipients' do
described_class::THRESHOLD.times do
status1 = status_with_html('@alice Hello')
described_class.new(status1).remember!
end
status2 = status_with_html('@bob Hello')
expect(described_class.new(status2).spam?).to be true
end
it 'returns true for nearly identical statuses with random numbers' do
source_text = 'Sodium, atomic number 11, was first isolated by Humphry Davy in 1807. A chemical component of salt, he named it Na in honor of the saltiest region on earth, North America.'
described_class::THRESHOLD.times do
status1 = status_with_html('@alice ' + source_text + ' 1234')
described_class.new(status1).remember!
end
status2 = status_with_html('@bob ' + source_text + ' 9568')
expect(described_class.new(status2).spam?).to be true
end
end
describe '#skip?' do
it 'returns true when the sender is already silenced' do
status = status_with_html('@alice Hello')
sender.silence!
expect(described_class.new(status).skip?).to be true
end
it 'returns true when the mentioned person follows the sender' do
status = status_with_html('@alice Hello')
alice.follow!(sender)
expect(described_class.new(status).skip?).to be true
end
it 'returns false when even one mentioned person doesn\'t follow the sender' do
status = status_with_html('@alice @bob Hello')
alice.follow!(sender)
expect(described_class.new(status).skip?).to be false
end
it 'returns true when the sender is replying to a status that mentions the sender' do
parent = PostStatusService.new.call(alice, text: "Hey @#{sender.username}, how are you?")
status = status_with_html('@alice @bob Hello', thread: parent)
expect(described_class.new(status).skip?).to be true
end
end
describe '#remember!' do
let(:status) { status_with_html('@alice') }
let(:spam_check) { described_class.new(status) }
let(:redis_key) { spam_check.send(:redis_key) }
it 'remembers' do
expect(Redis.current.exists?(redis_key)).to be true
spam_check.remember!
expect(Redis.current.exists?(redis_key)).to be true
end
end
describe '#reset!' do
let(:status) { status_with_html('@alice') }
let(:spam_check) { described_class.new(status) }
let(:redis_key) { spam_check.send(:redis_key) }
before do
spam_check.remember!
end
it 'resets' do
expect(Redis.current.exists?(redis_key)).to be true
spam_check.reset!
expect(Redis.current.exists?(redis_key)).to be false
end
end
describe '#flag!' do
let!(:status1) { status_with_html('@alice General Kenobi you are a bold one') }
let!(:status2) { status_with_html('@alice @bob General Kenobi, you are a bold one') }
before do
described_class.new(status1).remember!
described_class.new(status2).flag!
end
it 'creates a report about the account' do
expect(sender.targeted_reports.unresolved.count).to eq 1
end
it 'attaches both matching statuses to the report' do
expect(sender.targeted_reports.first.status_ids).to include(status1.id, status2.id)
end
end
end