/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.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 | # -*- 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
}
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