/usr/share/horde/passwd/lib/Driver/ is in php-horde-passwd 5.0.2-3+deb8u1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/horde/passwd/lib/Driver/Adsi.php
/usr/share/horde/passwd/lib/Driver/Composite.php
/usr/share/horde/passwd/lib/Driver/Expect.php
/usr/share/horde/passwd/lib/Driver/Expectpecl.php
/usr/share/horde/passwd/lib/Driver/Horde.php
/usr/share/horde/passwd/lib/Driver/Http.php
/usr/share/horde/passwd/lib/Driver/Kolab.php
/usr/share/horde/passwd/lib/Driver/Ldap.php
/usr/share/horde/passwd/lib/Driver/Null.php
/usr/share/horde/passwd/lib/Driver/Pine.php
/usr/share/horde/passwd/lib/Driver/Poppassd.php
/usr/share/horde/passwd/lib/Driver/Procopen.php
/usr/share/horde/passwd/lib/Driver/Pspasswd.php
/usr/share/horde/passwd/lib/Driver/Servuftp.php
/usr/share/horde/passwd/lib/Driver/Smbldap.php
/usr/share/horde/passwd/lib/Driver/Smbpasswd.php
/usr/share/horde/passwd/lib/Driver/Soap.php
/usr/share/horde/passwd/lib/Driver/Sql.php
/usr/share/horde/passwd/lib/Driver/Vmailmgr.php
/usr/share/horde/passwd/lib/Driver/Vpopmail.php