This file is indexed.

/etc/freeradius/3.0/mods-available/idn is in freeradius-config 3.0.16+dfsg-1ubuntu3.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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# -*- text -*-
#
#  $Id: 534054077d52a7bb0bf8e02c1e861e5c86b76df9 $

#
# Internationalised domain names.
#

#  The expansion string: %{idn: example.com} results in an ASCII
#  punycode version of the domain name.  That version can then be used
#  for name comparisons.  Using an i18n version of the name is NOT
#  RECOMMENDED, as that version is not canonical.
#
#  i.e. the "same" domain name can be represented in many, many,
#  different ways.  Only the idn version has *one* representation.
#
idn {
	#
	#  Allow use of unassigned Unicode code points.
	#
	allow_unassigned = no

	#
	#  Prohibit underscores and other invalid characters in domain
	#  names.
	use_std3_ascii_rules = yes

}