/usr/share/php/Symfony/Component/Security/Core/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/Core/Authentication/AuthenticationManagerInterface.php
/usr/share/php/Symfony/Component/Security/Core/Authentication/AuthenticationProviderManager.php
/usr/share/php/Symfony/Component/Security/Core/Authentication/AuthenticationTrustResolver.php
/usr/share/php/Symfony/Component/Security/Core/Authentication/AuthenticationTrustResolverInterface.php
/usr/share/php/Symfony/Component/Security/Core/Authentication/Provider/
/usr/share/php/Symfony/Component/Security/Core/Authentication/Provider/AnonymousAuthenticationProvider.php
/usr/share/php/Symfony/Component/Security/Core/Authentication/Provider/AuthenticationProviderInterface.php
/usr/share/php/Symfony/Component/Security/Core/Authentication/Provider/DaoAuthenticationProvider.php
/usr/share/php/Symfony/Component/Security/Core/Authentication/Provider/PreAuthenticatedAuthenticationProvider.php
/usr/share/php/Symfony/Component/Security/Core/Authentication/Provider/RememberMeAuthenticationProvider.php
/usr/share/php/Symfony/Component/Security/Core/Authentication/Provider/SimpleAuthenticationProvider.php
/usr/share/php/Symfony/Component/Security/Core/Authentication/Provider/UserAuthenticationProvider.php
/usr/share/php/Symfony/Component/Security/Core/Authentication/RememberMe/
/usr/share/php/Symfony/Component/Security/Core/Authentication/RememberMe/InMemoryTokenProvider.php
/usr/share/php/Symfony/Component/Security/Core/Authentication/RememberMe/PersistentToken.php
/usr/share/php/Symfony/Component/Security/Core/Authentication/RememberMe/PersistentTokenInterface.php
/usr/share/php/Symfony/Component/Security/Core/Authentication/RememberMe/TokenProviderInterface.php
/usr/share/php/Symfony/Component/Security/Core/Authentication/SimpleAuthenticatorInterface.php
/usr/share/php/Symfony/Component/Security/Core/Authentication/SimpleFormAuthenticatorInterface.php
/usr/share/php/Symfony/Component/Security/Core/Authentication/SimplePreAuthenticatorInterface.php
/usr/share/php/Symfony/Component/Security/Core/Authentication/Token/
/usr/share/php/Symfony/Component/Security/Core/Authentication/Token/AbstractToken.php
/usr/share/php/Symfony/Component/Security/Core/Authentication/Token/AnonymousToken.php
/usr/share/php/Symfony/Component/Security/Core/Authentication/Token/PreAuthenticatedToken.php
/usr/share/php/Symfony/Component/Security/Core/Authentication/Token/RememberMeToken.php
/usr/share/php/Symfony/Component/Security/Core/Authentication/Token/Storage/
/usr/share/php/Symfony/Component/Security/Core/Authentication/Token/Storage/TokenStorage.php
/usr/share/php/Symfony/Component/Security/Core/Authentication/Token/Storage/TokenStorageInterface.php
/usr/share/php/Symfony/Component/Security/Core/Authentication/Token/TokenInterface.php
/usr/share/php/Symfony/Component/Security/Core/Authentication/Token/UsernamePasswordToken.php