TaintedLove

Note: Ruby 2.7+ removed support of the taint checking mechanism

TaintedLove is a dynamic security analysis tool for Ruby. It leverages Ruby's object tainting and monkey patching features to identify vulnerable code paths at runtime.

• Getting Started
• Wiki
• API documentation

Add this line to your application's Gemfile:

gem 'tainted_love'

And then execute:

$ bundle

Or install it yourself as:

$ gem install tainted_love

TaintedLove needs to replace multiple functions. It is ideal to enable it when the application has all of its dependencies loaded and is ready to use.

To enable TaintedLove in your project:

TaintedLove.enable! do |config|
  # This is the default configuration
  # config.logger = Logger.new
  # config.replacers = TaintedLove::Replacer::Base.replacers
  # config.validators = TaintedLove::Validator::Base.validators
  # config.reporter = TaintedLove::Reporter::StdoutReporter.new
end

In Ruby on Rails, this could be done in an initializer file config/initializer/tainted_love.rb

TaintedLove.enable! do |config|
  config.logger = Rails.logger
end

Start your application! The default reporter will output into the console.

TaintedLove currently detects the following patterns. If the execution of the application ever encounters these function calls, TaintedLove will report it.

Object#send(tainted_input_1, tainted_input_2)
File.read(tainted_input).taint
File.write(tainted_input, _)
Kernel#eval(tainted_input)
Kernel#system(tainted_input)
Kernel#`(tainted_input)
Kernel#open("|" + tainted_input)
Marshal.load(tainted_input)
YAML.load(tainted_input)

# Rails specific patterns
render(tainted_input)
render(inline: tainted_input)
render(file: tainted_input)
<%= tainted_input.html_safe %>
Model.where(tainted_input)
Model.select(tainted_input)
Model.find_by_sql(tainted_input)
Model.count_by_sql(tainted_input)
Model.order(tainted_input)

After checking out the repo, run bin/setup to install dependencies. Then, run bin/test to run the tests. You can also run bin/console for an interactive prompt that will allow you to experiment.

To install this gem onto your local machine, run bundle exec rake install.

Bug reports and pull requests are welcome on GitHub at https://github.com/Shopify/tainted_love.

The gem is available as open source under the terms of the MIT License.