/usr/lib/ruby/ is in ruby-net-ldap 0.16.1-1.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/ruby/vendor_ruby/
/usr/lib/ruby/vendor_ruby/net/
/usr/lib/ruby/vendor_ruby/net/ber/
/usr/lib/ruby/vendor_ruby/net/ber/ber_parser.rb
/usr/lib/ruby/vendor_ruby/net/ber/core_ext/
/usr/lib/ruby/vendor_ruby/net/ber/core_ext/array.rb
/usr/lib/ruby/vendor_ruby/net/ber/core_ext/false_class.rb
/usr/lib/ruby/vendor_ruby/net/ber/core_ext/integer.rb
/usr/lib/ruby/vendor_ruby/net/ber/core_ext/string.rb
/usr/lib/ruby/vendor_ruby/net/ber/core_ext/true_class.rb
/usr/lib/ruby/vendor_ruby/net/ber/core_ext.rb
/usr/lib/ruby/vendor_ruby/net/ber.rb
/usr/lib/ruby/vendor_ruby/net/ldap/
/usr/lib/ruby/vendor_ruby/net/ldap/auth_adapter/
/usr/lib/ruby/vendor_ruby/net/ldap/auth_adapter/gss_spnego.rb
/usr/lib/ruby/vendor_ruby/net/ldap/auth_adapter/sasl.rb
/usr/lib/ruby/vendor_ruby/net/ldap/auth_adapter/simple.rb
/usr/lib/ruby/vendor_ruby/net/ldap/auth_adapter.rb
/usr/lib/ruby/vendor_ruby/net/ldap/connection.rb
/usr/lib/ruby/vendor_ruby/net/ldap/dataset.rb
/usr/lib/ruby/vendor_ruby/net/ldap/dn.rb
/usr/lib/ruby/vendor_ruby/net/ldap/entry.rb
/usr/lib/ruby/vendor_ruby/net/ldap/error.rb
/usr/lib/ruby/vendor_ruby/net/ldap/filter.rb
/usr/lib/ruby/vendor_ruby/net/ldap/instrumentation.rb
/usr/lib/ruby/vendor_ruby/net/ldap/password.rb
/usr/lib/ruby/vendor_ruby/net/ldap/pdu.rb
/usr/lib/ruby/vendor_ruby/net/ldap/version.rb
/usr/lib/ruby/vendor_ruby/net/ldap.rb
/usr/lib/ruby/vendor_ruby/net/snmp.rb
/usr/lib/ruby/vendor_ruby/net-ldap.rb