Commit ca05054e authored by Robert Speicher's avatar Robert Speicher

Partially revert "Add IP check against DNSBLs at account sign-up"

This partially reverts 6a5cd3ca - we keep the migration and add a new
migration that reverts it in order to keep migration history intact.
parent 2b1ddb0f
......@@ -15,6 +15,7 @@ v 8.5.0 (unreleased)
- Track project import failure
- Fix visibility level text in admin area (Zeger-Jan van de Weg)
- Update the ExternalIssue regex pattern (Blake Hitchcock)
- Revert "Add IP check against DNSBLs at account sign-up"
- Deprecate API "merge_request/:merge_request_id/comments". Use "merge_requests/:merge_request_id/notes" instead
- Deprecate API "merge_request/:merge_request_id/...". Use "merge_requests/:merge_request_id/..." instead
......
......@@ -74,8 +74,6 @@ class Admin::ApplicationSettingsController < Admin::ApplicationController
:metrics_timeout,
:metrics_method_call_threshold,
:metrics_sample_interval,
:ip_blocking_enabled,
:dnsbl_servers_list,
:recaptcha_enabled,
:recaptcha_site_key,
:recaptcha_private_key,
......
......@@ -8,11 +8,6 @@ class RegistrationsController < Devise::RegistrationsController
def create
if !Gitlab::Recaptcha.load_configurations! || verify_recaptcha
if Gitlab::IpCheck.new(request.remote_ip).spam?
flash[:alert] = 'Could not create an account. This IP is listed for spam.'
return render action: 'new'
end
super
else
flash[:alert] = "There was an error with the reCAPTCHA code below. Please re-enter the code."
......
......@@ -43,8 +43,6 @@
# metrics_port :integer default(8089)
# sentry_enabled :boolean default(FALSE)
# sentry_dsn :string
# ip_blocking_enabled :boolean default(FALSE)
# dns_blacklist_threshold :float default(0.33)
#
class ApplicationSetting < ActiveRecord::Base
......
......@@ -212,22 +212,6 @@
%fieldset
%legend Spam and Anti-bot Protection
.form-group
.col-sm-offset-2.col-sm-10
.checkbox
= f.label :ip_blocking_enabled do
= f.check_box :ip_blocking_enabled
Enable IP check against blacklist at sign-up
.help-block Helps preventing accounts creation from 'known spam sources'
.form-group
= f.label :dnsbl_servers_list, class: 'control-label col-sm-2' do
DNSBL servers list
.col-sm-10
= f.text_field :dnsbl_servers_list, class: 'form-control'
.help-block
Please enter DNSBL servers separated with comma
.form-group
.col-sm-offset-2.col-sm-10
.checkbox
......
class RemoveIpBlockingSettingsFromApplicationSettings < ActiveRecord::Migration
def change
remove_column :application_settings, :ip_blocking_enabled, :boolean, default: false
remove_column :application_settings, :dnsbl_servers_list, :text
end
end
......@@ -11,7 +11,7 @@
#
# It's strongly recommended that you check this file into your version control system.
ActiveRecord::Schema.define(version: 20160120172143) do
ActiveRecord::Schema.define(version: 20160128212447) do
# These are extensions that must be enabled in order to support this database
enable_extension "plpgsql"
......@@ -64,8 +64,6 @@ ActiveRecord::Schema.define(version: 20160120172143) do
t.integer "metrics_sample_interval", default: 15
t.boolean "sentry_enabled", default: false
t.string "sentry_dsn"
t.boolean "ip_blocking_enabled", default: false
t.text "dnsbl_servers_list"
end
create_table "audit_events", force: :cascade do |t|
......
require 'resolv'
class DNSXLCheck
class Resolver
def self.search(query)
begin
Resolv.getaddress(query)
true
rescue Resolv::ResolvError
false
end
end
end
IP_REGEXP = /\A(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.){3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\z/
DEFAULT_THRESHOLD = 0.33
def self.create_from_list(list)
dnsxl_check = DNSXLCheck.new
list.each do |entry|
dnsxl_check.add_list(entry.domain, entry.weight)
end
dnsxl_check
end
def test(ip)
if use_threshold?
test_with_threshold(ip)
else
test_strict(ip)
end
end
def test_with_threshold(ip)
return false if lists.empty?
search(ip)
final_score >= threshold
end
def test_strict(ip)
return false if lists.empty?
search(ip)
@score > 0
end
def use_threshold=(value)
@use_threshold = value == true
end
def use_threshold?
@use_threshold &&= true
end
def threshold=(threshold)
raise ArgumentError, "'threshold' value must be grather than 0 and less than or equal to 1" unless threshold > 0 && threshold <= 1
@threshold = threshold
end
def threshold
@threshold ||= DEFAULT_THRESHOLD
end
def add_list(domain, weight)
@lists ||= []
@lists << { domain: domain, weight: weight }
end
def lists
@lists ||= []
end
private
def search(ip)
raise ArgumentError, "'ip' value must be in #{IP_REGEXP} format" unless ip.match(IP_REGEXP)
@score = 0
reversed = reverse_ip(ip)
search_in_rbls(reversed)
end
def reverse_ip(ip)
ip.split('.').reverse.join('.')
end
def search_in_rbls(reversed_ip)
lists.each do |rbl|
query = "#{reversed_ip}.#{rbl[:domain]}"
@score += rbl[:weight] if Resolver.search(query)
end
end
def final_score
weights = lists.map{ |rbl| rbl[:weight] }.reduce(:+).to_i
return 0 if weights == 0
(@score.to_f / weights.to_f).round(2)
end
end
module Gitlab
class IpCheck
def initialize(ip)
@ip = ip
application_settings = ApplicationSetting.current
@ip_blocking_enabled = application_settings.ip_blocking_enabled
@dnsbl_servers_list = application_settings.dnsbl_servers_list
end
def spam?
@ip_blocking_enabled && blacklisted?
end
private
def blacklisted?
on_dns_blacklist?
end
def on_dns_blacklist?
dnsbl_check = DNSXLCheck.new
prepare_dnsbl_list(dnsbl_check)
dnsbl_check.test(@ip)
end
def prepare_dnsbl_list(dnsbl_check)
@dnsbl_servers_list.split(',').map(&:strip).reject(&:empty?).each do |domain|
dnsbl_check.add_list(domain, 1)
end
end
end
end
require 'spec_helper'
require 'ostruct'
describe 'DNSXLCheck', lib: true, no_db: true do
let(:spam_ip) { '127.0.0.2' }
let(:no_spam_ip) { '127.0.0.3' }
let(:invalid_ip) { 'a.b.c.d' }
let!(:dnsxl_check) { DNSXLCheck.create_from_list([OpenStruct.new({ domain: 'test', weight: 1 })]) }
before(:context) do
class DNSXLCheck::Resolver
class << self
alias_method :old_search, :search
def search(query)
return false if query.match(/always\.failing\.domain\z/)
return true if query.match(/\A2\.0\.0\.127\./)
return false if query.match(/\A3\.0\.0\.127\./)
end
end
end
end
describe '#test' do
before do
dnsxl_check.threshold = 0.75
dnsxl_check.add_list('always.failing.domain', 1)
end
context 'when threshold is used' do
before { dnsxl_check.use_threshold= true }
it { expect(dnsxl_check.test(spam_ip)).to be_falsey }
end
context 'when threshold is not used' do
before { dnsxl_check.use_threshold= false }
it { expect(dnsxl_check.test(spam_ip)).to be_truthy }
end
end
describe '#test_with_threshold' do
it { expect{ dnsxl_check.test_with_threshold(invalid_ip) }.to raise_error(ArgumentError) }
it { expect(dnsxl_check.test_with_threshold(spam_ip)).to be_truthy }
it { expect(dnsxl_check.test_with_threshold(no_spam_ip)).to be_falsey }
end
describe '#test_strict' do
before do
dnsxl_check.threshold = 1
dnsxl_check.add_list('always.failing.domain', 1)
end
it { expect{ dnsxl_check.test_strict(invalid_ip) }.to raise_error(ArgumentError) }
it { expect(dnsxl_check.test_with_threshold(spam_ip)).to be_falsey }
it { expect(dnsxl_check.test_with_threshold(no_spam_ip)).to be_falsey }
it { expect(dnsxl_check.test_strict(spam_ip)).to be_truthy }
it { expect(dnsxl_check.test_strict(no_spam_ip)).to be_falsey }
end
describe '#threshold=' do
it { expect{ dnsxl_check.threshold = 0 }.to raise_error(ArgumentError) }
it { expect{ dnsxl_check.threshold = 1.1 }.to raise_error(ArgumentError) }
it { expect{ dnsxl_check.threshold = 0.5 }.not_to raise_error }
end
end
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