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# frozen_string_literal: true
# == AuthenticatesWithTwoFactor
#
# Controller concern to handle two-factor authentication
#
# Upon inclusion, skips `require_no_authentication` on `:create`.
module AuthenticatesWithTwoFactor
extend ActiveSupport::Concern
included do
# This action comes from DeviseController, but because we call `sign_in`
# manually, not skipping this action would cause a "You are already signed
# in." error message to be shown upon successful login.
skip_before_action :require_no_authentication, only: [:create], raise: false
end
# Store the user's ID in the session for later retrieval and render the
# two factor code prompt
#
# The user must have been authenticated with a valid login and password
# before calling this method!
#
# user - User record
#
# Returns nil
def prompt_for_two_factor(user)
# Set @user for Devise views
@user = user # rubocop:disable Gitlab/ModuleWithInstanceVariables
return locked_user_redirect(user) unless user.can?(:log_in)
session[:otp_user_id] = user.id
setup_u2f_authentication(user)
render 'devise/sessions/two_factor'
end
def locked_user_redirect(user)
flash.now[:alert] = _('Invalid Login or password')
render 'devise/sessions/new'
end
def authenticate_with_two_factor
user = self.resource = find_user
return locked_user_redirect(user) unless user.can?(:log_in)
if user_params[:otp_attempt].present? && session[:otp_user_id]
authenticate_with_two_factor_via_otp(user)
elsif user_params[:device_response].present? && session[:otp_user_id]
authenticate_with_two_factor_via_u2f(user)
elsif user && user.valid_password?(user_params[:password])
prompt_for_two_factor(user)
end
end
private
def authenticate_with_two_factor_via_otp(user)
if valid_otp_attempt?(user)
# Remove any lingering user data from login
session.delete(:otp_user_id)
remember_me(user) if user_params[:remember_me] == '1'
user.save!
sign_in(user, message: :two_factor_authenticated)
else
user.increment_failed_attempts!
Gitlab::AppLogger.info("Failed Login: user=#{user.username} ip=#{request.remote_ip} method=OTP")
flash.now[:alert] = _('Invalid two-factor code.')
prompt_for_two_factor(user)
end
end
# Authenticate using the response from a U2F (universal 2nd factor) device
def authenticate_with_two_factor_via_u2f(user)
if U2fRegistration.authenticate(user, u2f_app_id, user_params[:device_response], session[:challenge])
# Remove any lingering user data from login
session.delete(:otp_user_id)
session.delete(:challenge)
remember_me(user) if user_params[:remember_me] == '1'
sign_in(user, message: :two_factor_authenticated)
else
user.increment_failed_attempts!
Gitlab::AppLogger.info("Failed Login: user=#{user.username} ip=#{request.remote_ip} method=U2F")
flash.now[:alert] = _('Authentication via U2F device failed.')
prompt_for_two_factor(user)
end
end
# Setup in preparation of communication with a U2F (universal 2nd factor) device
# Actual communication is performed using a Javascript API
# rubocop: disable CodeReuse/ActiveRecord
def setup_u2f_authentication(user)
key_handles = user.u2f_registrations.pluck(:key_handle)
u2f = U2F::U2F.new(u2f_app_id)
if key_handles.present?
sign_requests = u2f.authentication_requests(key_handles)
session[:challenge] ||= u2f.challenge
gon.push(u2f: { challenge: session[:challenge], app_id: u2f_app_id,
sign_requests: sign_requests })
end
end
# rubocop: enable CodeReuse/ActiveRecord
end
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