/usr/share/php/Symfony/Component/Security/Http/Authentication/ is in php-symfony-security 2.7.10-0ubuntu2.
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