This file is indexed.

/etc/freeradius/3.0/mods-available/unix 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: 5165139aaf39d533581161871542b48a6e3e8c42 $

# Unix /etc/passwd style authentication
#
#  This module calls the system functions to get the "known good"
#  password.  This password is usually in the "crypt" form, and is
#  incompatible with CHAP, MS-CHAP, PEAP, etc.
#
#  If passwords are in /etc/shadow, you will need to set the "group"
#  configuration in radiusd.conf.  Look for "shadow", and follow the
#  instructions there.
#
unix {
	#
	#  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
}