This file is indexed.

/etc/freeradius/modules/unix is in freeradius 2.1.12+dfsg-1.2.

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 -*-
#
#  $Id$

# Unix /etc/passwd style authentication
#
unix {
	#  As of 1.1.0, the Unix module no longer reads,
	#  or caches /etc/passwd, /etc/shadow, or /etc/group.
	#  If you wish to cache those files, see the passwd
	#  module.
	#

	#
	#  The location of the "wtmp" file.
	#  The only use for 'radlast'.  If you don't use
	#  'radlast', then you can comment out this item.
	#
	#  Note that the radwtmp file may get large!  You should
	#  rotate it (cp /dev/null radwtmp), or just not use it.
	#
	radwtmp = ${logdir}/radwtmp
}