This file is indexed.

/etc/freeradius/3.0/mods-available/realm 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: 36825e0fe77cb515219ba7febc37192988ed9fba $

# Realm module, for proxying.
#
#  You can have multiple instances of the realm module to
#  support multiple realm syntaxes at the same time.  The
#  search order is defined by the order that the modules are listed
#  in the authorize and preacct sections.
#
#  Four config options:
#	format	 -  must be "prefix" or "suffix"
#			  The special cases of "DEFAULT"
#			  and "NULL" are allowed, too.
#	delimiter      -  must be a single character

#  'realm/username'
#
#  Using this entry, IPASS users have their realm set to "IPASS".
realm IPASS {
	format = prefix
	delimiter = "/"
}

#  'username@realm'
#
realm suffix {
	format = suffix
	delimiter = "@"

	# The next 3 configuration items are valid ONLY
	# for a trust-router.  For all other realms,
	# they are ignored.
#	trust_router = "localhost"
#	tr_port = 12309
#	rp_realm = "painless-security.com"
#	default_community = "apc.moonshot.ja.net"
}

#  'username%realm'
#
realm realmpercent {
	format = suffix
	delimiter = "%"
}

#
#  'domain\user'
#
realm ntdomain {
	format = prefix
	delimiter = "\\"
}