devise_zxcvbn

Plugin for devise to reject weak passwords, using zxcvbn-js which is a ruby port of zxcvbn: realistic password strength estimation.

The user's password will be rejected if the score is below 4 by default. It also uses the email as user input to zxcvbn, to reject passwords containing parts of the email (if using zxcvbn.js on the frontend you should also do this to get the same score).

The scores 0, 1, 2, 3 or 4 are given when the estimated crack time (seconds) is less than 10**2, 10**4, 10**6, 10**8, Infinity.

Installation

Add this line to your application's Gemfile:

gem 'devise_zxcvbn'

Configuration

class User < ActiveRecord::Base
  devise :zxcvbnable

  # Optionally add more weak words to check against:
  def weak_words
    ['mysitename', self.name, self.username]
  end
end

Default parameters

A score of less than 3 is not recommended.

# config/initializers/devise.rb
Devise.setup do |config|
  config.min_password_score = 4
end

Error Message

The default error message:

"not strong enough. It scored %{score}. It must score at least %{min_password_score}."

You can customize this error message modifying the devise YAML file.

The feedback, crack_time_display, score and min_password_score variables are passed through if you need them.

# config/locales/devise.en.yml
en:
  errors:
    messages:
      weak_password: "not strong enough. Consider adding a number, symbols or more letters to make it stronger."

Contributing

1. Fork it
2. Create your feature branch (git checkout -b my-new-feature)
3. Commit your changes (git commit -am 'Add some feature')
4. Push to the branch (git push origin my-new-feature)
5. Create new Pull Request