This file is indexed.

/etc/freeradius/3.0/sites-available/proxy-inner-tunnel 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 -*-
######################################################################
#
#	This is a virtual server that handles *only* inner tunnel
#	requests for EAP-TTLS and PEAP types.
#
#	$Id: 938d954592d3824e4d51e3315d0f7e0b5cfde824 $
#
######################################################################

server proxy-inner-tunnel {

#
#  This example is very simple.  All inner tunnel requests get
#  proxied to another RADIUS server.
#
authorize {
	#
	#  Do other things here, as necessary.
	#
	#  e.g. run the "realms" module, to decide how to proxy
	#  the inner tunnel request.
	#

	update control {
		#  You should update this to be one of your realms.
		&Proxy-To-Realm := "example.com"
	}
}

authenticate {
	#
	#  This is necessary so that the inner tunnel EAP-MSCHAPv2
	#  method can be called.  That method takes care of turning
	#  EAP-MSCHAPv2 into plain MS-CHAPv2, if necessary.
	eap
}

post-proxy {
	#
	#  This is necessary for LEAP, or if you set:
	#
	#  proxy_tunneled_request_as_eap = no
	#
	eap
}
}