This file is indexed.

/lib/live/config/0030-user-setup is in live-config 3.0.23-1+deb8u1.

This file is owned by root:root, with mode 0o755.

The actual contents of the file can be viewed below.

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#!/bin/sh

## live-config(7) - System Configuration Scripts
## Copyright (C) 2006-2013 Daniel Baumann <daniel@debian.org>
##
## This program comes with ABSOLUTELY NO WARRANTY; for details see COPYING.
## This is free software, and you are welcome to redistribute it
## under certain conditions; see COPYING for details.


User_setup ()
{
	# Checking if package is installed or already configured
	if [ ! -e /var/lib/dpkg/info/user-setup.list ] || \
	   [ -e /var/lib/live/config/user-setup ]
	then
		return
	fi

	echo -n " user-setup"

	# Reading kernel command line
	for _PARAMETER in ${_CMDLINE}
	do
		case "${_PARAMETER}" in
			live-config.user-default-groups=*|user-default-groups=*)
				LIVE_USER_DEFAULT_GROUPS="${_PARAMETER#*user-default-groups=}"
				;;

			live-config.user-fullname=*|user-fullname=*)
				LIVE_USER_FULLNAME="${_PARAMETER#*user-fullname=}"
				;;

			live-config.username=*|username=*)
				LIVE_USERNAME="${_PARAMETER#*username=}"
				;;
		esac
	done

	Configure_user_setup
}

Configure_user_setup ()
{
	# Checking if package is already configured differently
	if grep -q "^${LIVE_USERNAME}:" /etc/passwd
	then
		return
	fi

	# Adjust formating of groups
	if [ -n "${LIVE_USER_DEFAULT_GROUPS}" ]
	then
		LIVE_USER_DEFAULT_GROUPS="$(echo ${LIVE_USER_DEFAULT_GROUPS} | sed -e 's|,| |g')"
	fi

	# Make sure user is not in sudo group if sudo is disabled
	case "${_NOROOT}" in
		true)
			LIVE_USER_DEFAULT_GROUPS="$(echo ${LIVE_USER_DEFAULT_GROUPS} | sed -e 's|sudo||')"
			;;
	esac

	# Default password is: live
	# passwords can be generated with 'echo "live" | mkpasswd -s',
	# a blank password is 'U6aMy0wojraho'.
	_PASSWORD="8Ab05sVQ4LLps"

cat > /debconf.live << EOF
user-setup passwd/make-user boolean true
user-setup passwd/root-password-crypted string *
user-setup passwd/user-password-crypted string ${_PASSWORD}
user-setup passwd/user-default-groups string ${LIVE_USER_DEFAULT_GROUPS}
user-setup passwd/user-fullname string ${LIVE_USER_FULLNAME}
user-setup passwd/username string ${LIVE_USERNAME}
user-setup passwd/user-uid string 1000
EOF

	debconf-set-selections < /debconf.live
	rm -f /debconf.live

	# Workaround for bug in shadow
	set +e
	touch /etc/passwd-
	chmod 0600 /etc/passwd-

	/usr/lib/user-setup/user-setup-apply 2>&1 \
	| grep -v "Shadow passwords are now on"
	set -e

	# Creating state file
	touch /var/lib/live/config/user-setup
}

User_setup