debian-mirror-gitlab/app/services/webauthn/authenticate_service.rb

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2020-11-24 15:15:51 +05:30
# frozen_string_literal: true
module Webauthn
class AuthenticateService < BaseService
def initialize(user, device_response, challenge)
@user = user
@device_response = device_response
@challenge = challenge
end
def execute
parsed_device_response = Gitlab::Json.parse(@device_response)
# appid is set for legacy U2F devices, will be used in a future iteration
# rp_id = @app_id
# unless parsed_device_response['clientExtensionResults'] && parsed_device_response['clientExtensionResults']['appid']
# rp_id = URI(@app_id).host
# end
webauthn_credential = WebAuthn::Credential.from_get(parsed_device_response)
encoded_raw_id = Base64.strict_encode64(webauthn_credential.raw_id)
stored_webauthn_credential = @user.webauthn_registrations.find_by_credential_xid(encoded_raw_id)
encoder = WebAuthn.configuration.encoder
if stored_webauthn_credential &&
validate_webauthn_credential(webauthn_credential) &&
verify_webauthn_credential(webauthn_credential, stored_webauthn_credential, @challenge, encoder)
stored_webauthn_credential.update!(counter: webauthn_credential.sign_count)
return true
end
false
rescue JSON::ParserError, WebAuthn::SignCountVerificationError, WebAuthn::Error
false
end
##
# Validates that webauthn_credential is syntactically valid
#
# duplicated from WebAuthn::PublicKeyCredential#verify
# which can't be used here as we need to call WebAuthn::AuthenticatorAssertionResponse#verify instead
# (which is done in #verify_webauthn_credential)
def validate_webauthn_credential(webauthn_credential)
webauthn_credential.type == WebAuthn::TYPE_PUBLIC_KEY &&
webauthn_credential.raw_id && webauthn_credential.id &&
webauthn_credential.raw_id == WebAuthn.standard_encoder.decode(webauthn_credential.id)
end
##
# Verifies that webauthn_credential matches stored_credential with the given challenge
#
def verify_webauthn_credential(webauthn_credential, stored_credential, challenge, encoder)
webauthn_credential.response.verify(
encoder.decode(challenge),
public_key: encoder.decode(stored_credential.public_key),
sign_count: stored_credential.counter)
end
end
end