/usr/share/php/kohana2/modules/auth/ is in libkohana2-modules-php 2.3.4-2.
This file is owned by root:root, with mode 0o755.
..
/usr/share/php/kohana2/modules/auth/config
/usr/share/php/kohana2/modules/auth/libraries/
/usr/share/php/kohana2/modules/auth/libraries/Auth.php
/usr/share/php/kohana2/modules/auth/libraries/drivers/
/usr/share/php/kohana2/modules/auth/libraries/drivers/Auth/
/usr/share/php/kohana2/modules/auth/libraries/drivers/Auth.php
/usr/share/php/kohana2/modules/auth/libraries/drivers/Auth/File.php
/usr/share/php/kohana2/modules/auth/libraries/drivers/Auth/ORM.php
/usr/share/php/kohana2/modules/auth/models/
/usr/share/php/kohana2/modules/auth/models/auth_role.php
/usr/share/php/kohana2/modules/auth/models/auth_user.php
/usr/share/php/kohana2/modules/auth/models/auth_user_token.php
/usr/share/php/kohana2/modules/auth/models/role.php
/usr/share/php/kohana2/modules/auth/models/user.php
/usr/share/php/kohana2/modules/auth/models/user_token.php