Two factor authentication for Devise

Features

• control sms code pattern
• configure max login attempts
• per user level control if he really need two factor authentication
• your own sms logic

Configuration

Initial Setup

In a Rails environment, require the gem in your Gemfile:

gem 'two_factor_authentication'

Once that's done, run:

bundle install

Automatic installation

In order to add two factor authorisation to a model, run the command:

bundle exec rails g two_factor_authentication MODEL

Where MODEL is your model name (e.g. User or Admin). This generator will add :two_factor_authenticatable to your model and create a migration in db/migrate/, which will add ::second_factor_pass_code and :second_factor_attempts_count to your table. Finally, run the migration with:

bundle exec rake db:migrate

Manual installation

To manually enable two factor authentication for the User model, you should add two_factor_authentication to your devise line, like:

  devise :database_authenticatable, :registerable,
         :recoverable, :rememberable, :trackable, :validatable, :two_factor_authenticatable

Two default parameters

  config.login_code_random_pattern = /\w+/
  config.max_login_attempts = 3

Possible random patterns

/\d{5}/
/\w{4,8}/

see more https://github.com/benburkert/randexp

Customisation

By default second factor authentication enabled for each user, you can change it with this method in your User model:

  def need_two_factor_authentication?(request)
    request.ip != '127.0.0.1'
  end

this will disable two factor authentication for local users

Your send sms logic should be in this method in your User model:

  def send_two_factor_authentication_code(code)
    puts code
  end

This example just puts the code in the logs.

External dependencies

Randexp requires words files (Check if it is installed in /usr/share/dict/words or /usr/dict/words), you might need install it:

apt-get install wbritish # or whichever you require