/usr/share/php/Symfony/Component/Security/Http/Authentication/ is in php-symfony-security-http 3.4.6+dfsg-1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/php/Symfony/Component/Security/Http/Authentication/AuthenticationFailureHandlerInterface.php
/usr/share/php/Symfony/Component/Security/Http/Authentication/AuthenticationSuccessHandlerInterface.php
/usr/share/php/Symfony/Component/Security/Http/Authentication/AuthenticationUtils.php
/usr/share/php/Symfony/Component/Security/Http/Authentication/CustomAuthenticationFailureHandler.php
/usr/share/php/Symfony/Component/Security/Http/Authentication/CustomAuthenticationSuccessHandler.php
/usr/share/php/Symfony/Component/Security/Http/Authentication/DefaultAuthenticationFailureHandler.php
/usr/share/php/Symfony/Component/Security/Http/Authentication/DefaultAuthenticationSuccessHandler.php
/usr/share/php/Symfony/Component/Security/Http/Authentication/SimpleAuthenticationHandler.php
/usr/share/php/Symfony/Component/Security/Http/Authentication/SimpleFormAuthenticatorInterface.php
/usr/share/php/Symfony/Component/Security/Http/Authentication/SimplePreAuthenticatorInterface.php