65 lines
2.4 KiB
Ruby
65 lines
2.4 KiB
Ruby
# frozen_string_literal: true
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# Registration information for U2F (universal 2nd factor) devices, like Yubikeys
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class U2fRegistration < ApplicationRecord
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belongs_to :user
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after_commit :schedule_webauthn_migration, on: :create
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after_commit :update_webauthn_registration, on: :update, if: :counter_changed?
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def schedule_webauthn_migration
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BackgroundMigrationWorker.perform_async('MigrateU2fWebauthn', [id, id])
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end
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def update_webauthn_registration
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# When we update the sign count of this registration
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# we need to update the sign count of the corresponding webauthn registration
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# as well if it exists already
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WebauthnRegistration.find_by_credential_xid(webauthn_credential_xid)&.update_attribute(:counter, counter)
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end
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def self.register(user, app_id, params, challenges)
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u2f = U2F::U2F.new(app_id)
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registration = self.new
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begin
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response = U2F::RegisterResponse.load_from_json(params[:device_response])
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registration_data = u2f.register!(challenges, response)
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registration.update(certificate: registration_data.certificate,
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key_handle: registration_data.key_handle,
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public_key: registration_data.public_key,
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counter: registration_data.counter,
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user: user,
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name: params[:name])
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rescue JSON::ParserError, NoMethodError, ArgumentError
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registration.errors.add(:base, _('Your U2F device did not send a valid JSON response.'))
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rescue U2F::Error => e
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registration.errors.add(:base, e.message)
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end
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registration
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end
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def self.authenticate(user, app_id, json_response, challenges)
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response = U2F::SignResponse.load_from_json(json_response)
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registration = user.u2f_registrations.find_by_key_handle(response.key_handle)
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u2f = U2F::U2F.new(app_id)
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if registration
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u2f.authenticate!(challenges, response, Base64.decode64(registration.public_key), registration.counter)
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registration.update(counter: response.counter)
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true
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end
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rescue JSON::ParserError, NoMethodError, ArgumentError, U2F::Error
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false
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end
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private
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def webauthn_credential_xid
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# To find the corresponding webauthn registration, we use that
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# the key handle of the u2f reg corresponds to the credential xid of the webauthn reg
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# (with some base64 back and forth)
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Base64.strict_encode64(Base64.urlsafe_decode64(key_handle))
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end
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end
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