3.1 KiB
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 :otp_secret_key and :second_factor_attempts_count to your table.
Finally, run the migration with:
bundle exec rake db:migrate
Add the following line to your model to fully enable two-factor auth:
has_one_time_password
Set config values if desired for maximum second factor attempts count and allowed time drift for one-time passwords:
config.max_login_attempts = 3
config.allowed_otp_drift_seconds = 30
Override the method to send one-time passwords in your model, this is automatically called when a user logs in:
def send_two_factor_authentication_code
# use Model#otp_code and send via SMS, etc.
end
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
Add the following line to your model to fully enable two-factor auth:
has_one_time_password
Set config values if desired for maximum second factor attempts count and allowed time drift for one-time passwords:
config.max_login_attempts = 3
config.allowed_otp_drift_seconds = 30
Override the method to send one-time passwords in your model, this is automatically called when a user logs in:
def send_two_factor_authentication_code
# use Model#otp_code and send via SMS, etc.
end
Customisation and Usage
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
This gem is compatible with Google Authenticator (https://support.google.com/accounts/answer/1066447?hl=en). You can generate provisioning uris by invoking the following method on your model:
user.provisioning_uri #This assumes a user model with an email attributes
This provisioning uri can then be turned in to a QR code if desired so that users may add the app to Google Authenticator easily. Once this is done they may retrieve a one-time password directly from the Google Authenticator app as well as through whatever method you define in send_two_factor_authentication_code