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# Registration information for U2F (universal 2nd factor) devices, like Yubikeys
class U2fRegistration < ActiveRecord::Base
belongs_to :user
def self.register(user, app_id, params, challenges)
u2f = U2F::U2F.new(app_id)
registration = self.new
begin
response = U2F::RegisterResponse.load_from_json(params[:device_response])
registration_data = u2f.register!(challenges, response)
registration.update(certificate: registration_data.certificate,
key_handle: registration_data.key_handle,
public_key: registration_data.public_key,
counter: registration_data.counter,
user: user,
name: params[:name])
rescue JSON::ParserError, NoMethodError, ArgumentError
registration.errors.add(:base, 'Your U2F device did not send a valid JSON response.')
rescue U2F::Error => e
registration.errors.add(:base, e.message)
end
registration
end
def self.authenticate(user, app_id, json_response, challenges)
response = U2F::SignResponse.load_from_json(json_response)
registration = user.u2f_registrations.find_by_key_handle(response.key_handle)
u2f = U2F::U2F.new(app_id)
if registration
u2f.authenticate!(challenges, response, Base64.decode64(registration.public_key), registration.counter)
registration.update(counter: response.counter)
true
end
rescue JSON::ParserError, NoMethodError, ArgumentError, U2F::Error
false
end
end
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