Perdu / Cookinspect

This Selenium-based crawler finds violations in cookie banners of IAB Europe's Transparency & Consent Framework

Cookinspect

Selenium-based crawler used to find violations in cookie banners of IAB Europe's Transparency & Consent Framework

Update August 2021: TCFv2 support uploaded to this repository.

Update September 2020: CMPs switched to TCFv2 in August 2020. This script only handles TCFv1 and is therefore obsolete unless it's adapted to the new TCF version (contact me if interested).

Introduction

In the paper Do Cookie Banners Respect my Choice? Measuring Legal Compliance of Banners from IAB Europe's Transparency and Consent Framework, we show that Consent Management Providers (CMPs) of IAB Europe's Transparency & Consent Framework (TCF) do not always respect user's choice. This repository contains the code of the crawler used for this paper.

Author: Célestin Matte (Université Côte d'Azur, Inria, France)

Dependencies

• postgresql
• python-tldextract
• python-selenium
• python-sqlalchemy
• python-publicsuffix2
• chromium-chromedriver (ubuntu)
• psycogs2 (ubuntu)
• consent-string (nodejs package)
• wget (to download vendorlists)

Install procedure

Database

• Create a postgresql database called "cookinspect", along with a "cookinspect" user and give appropriate access rights.

$ psql -c 'create database cookinspect'
$ psql cookinspect
# create role cookinspect;
# alter role cookinspect with login;
# grant connect on database cookinspect to cookinspect;
# grant all on database cookinspect to cookinspect;

Configuration

• copy cookinspect.conf.example to cookinspect.conf and modify it according to your database configuration.

Vendor lists

In order to detect violations, you need to download all vendor lists from IAB. Fortunately, there is a script that does that automatically.

cd vendorlist
./download.sh

IAB produces a new vendor list every week, so you need to launch this script again if you reuse cookinspect and it crashes because the latest vendorlist is not found.

Consent string decoding

(Unnecessary if you don't decode consent strings, e.g. if you only want to detect the presence of banners) Install IAB's consent string nodejs packages:

npm install --save consent-string
npm install --save @iabtcf/core

Potential installs issue

• You may need to add a password to your database user so that sqlalchemy lets you connect

Usage

python cookinspect.py [--full-violations-check|--automatic-violations-check|--semi-automatic-violations-check|--help]

Run it with --help for more options. By default, the script will attempt to load the website and say if it contains a TCF-related CMP.

Displaying results

To display results for a single website, use the --dump option.

To display statistics on all websites present in the database, use

python extract_results.py

Running a campaign on many websites

• Copy the list of websites in a CSV file, without www. subdomain (this will be tested automatically). See an example in examples/iab_banners.csv

• Use run.sh:

  run.sh DOMAINS_LIST_FILE OUTPUT_LOG_FILE [--semi-automatic|--full|--test-cmp]

It runs the automatic crawl by default.

Security caution

This tool takes a lot of inputs from the targeted website and has not been built with security in mind. Someone reading this code COULD exploit it. Please do not run outside a safe environment, e.g. at least a separate unix user having no right on your system.

Additional notes

Stage: completed project (2019). TCFv2 support added in August 2021.

This was an experimental single-developer research project. Direction changed several times during development, so please be very tolerant with code quality.