This file is indexed.

/etc/freeradius/3.0/mods-available/etc_group is in freeradius-config 3.0.12+dfsg-5+deb9u1.

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: f58b72f560ba067991d67295b546691bcd992d44 $

#  "passwd" configuration, for the /etc/group file. Adds a Etc-Group-Name
#  attribute for every group that the user is member of.
#
#  You will have to define the Etc-Group-Name in the 'dictionary' file
#  as a 'string' type.
#
#  The Group and Group-Name attributes are automatically created by
#  the Unix module, and do checking against /etc/group automatically.
#  This means that you CANNOT use Group or Group-Name to do any other
#  kind of grouping in the server.  You MUST define a new group
#  attribute.
#
#  i.e. this module should NOT be used as-is, but should be edited to
#  point to a different group file.
#
passwd etc_group {
	filename = /etc/group
	format = "=Etc-Group-Name:::*,User-Name"
	hash_size = 50
	ignore_nislike = yes
	allow_multiple_keys = yes
	delimiter = ":"
}