bpfire/src/initscripts/helper/aws-setup

#!/bin/bash

. /etc/sysconfig/rc
. ${rc_functions}

get() {
	local file="${1}"

	wget -qO - "http://169.254.169.254/latest/meta-data/${file}"
}

to_address() {
	local n="${1}"

	local o1=$(( (n & 0xff000000) >> 24 ))
	local o2=$(( (n & 0xff0000) >> 16 ))
	local o3=$(( (n & 0xff00) >> 8 ))
	local o4=$(( (n & 0xff) ))

	printf "%d.%d.%d.%d\n" "${o1}" "${o2}" "${o3}" "${o4}"
}

to_integer() {
	local address="${1}"

	local integer=0

	local i
	for i in ${address//\./ }; do
		integer=$(( (integer << 8) + i ))
	done

	printf "%d\n" "${integer}"
}

prefix2netmask() {
	local prefix=${1}

	local zeros=$(( 32 - prefix ))
	local netmask=0

	local i
	for (( i=0; i<${zeros}; i++ )); do
		netmask=$(( (netmask << 1) ^ 1 ))
	done

	to_address "$(( netmask ^ 0xffffffff ))"
}

import_aws_configuration() {
	local instance_id="$(get instance-id)"

	boot_mesg "Importing AWS configuration for instance ${instance_id}..."

	# Initialise system settings
	if [ ! -s "/var/ipfire/main/settings" ]; then
		local hostname=$(get local-hostname)

		(
			echo "HOSTNAME=${hostname%%.*}"
			echo "DOMAINNAME=${hostname#*.}"
		) > /var/ipfire/main/settings
	fi

	# Import any DNS server settings
	eval $(/usr/local/bin/readhash <(grep -E "^DNS([0-9])=" /var/ipfire/ethernet/settings 2>/dev/null))

	# Import network configuration
	(
		# RED + GREEN
       		echo "CONFIG_TYPE=1"
	) > /var/ipfire/ethernet/settings

	for mac in $(get network/interfaces/macs/); do
		# Remove trailing slash
		mac="${mac//\//}"

		local device_number="$(get "network/interfaces/macs/${mac}/device-number")"
		local interface_id="$(get "network/interfaces/macs/${mac}/interface-id")"

		# First IPv4 address
		local ipv4_address="$(get "network/interfaces/macs/${mac}/local-ipv4s" | head -n1)"
		local ipv4_address_num="$(to_integer "${ipv4_address}")"

		# Get subnet size
		local subnet="$(get "network/interfaces/macs/${mac}/subnet-ipv4-cidr-block")"

		local prefix="${subnet#*/}"
		local netmask="$(prefix2netmask "${prefix}")"
		local netmask_num="$(to_integer "${netmask}")"

		# Calculate the network and broadcast addresses
		local netaddress="${subnet%/*}"
		local netaddress_num="$(to_integer "${netaddress}")"
		local broadcast="$(to_address $(( ipv4_address_num | (0xffffffff ^ netmask_num) )))"

		# The gateway is always the first IP address in the subnet
		local gateway="$(to_address $(( netaddress_num + 1 )))"

		# The AWS internal DNS service is available on the fourth IP address of each subnet
		local dns1="$(to_address $(( netaddress_num + 4 )))"
		local dns2=

		case "${device_number}" in
			# RED
			0)
				(
					echo "RED_TYPE=STATIC"
					echo "RED_DEV=red0"
					echo "RED_MACADDR=${mac}"
					echo "RED_DESCRIPTION='${interface_id}'"
					echo "RED_ADDRESS=${ipv4_address}"
					echo "RED_NETMASK=${netmask}"
					echo "RED_NETADDRESS=${netaddress}"
					echo "RED_BROADCAST=${broadcast}"
					echo "DEFAULT_GATEWAY=${gateway}"
					echo "DNS1=${DNS1:-${dns1}}"
					echo "DNS2=${DNS2:-${dns2}}"
				) >> /var/ipfire/ethernet/settings

				# Import aliases for RED
				for alias in $(get "network/interfaces/macs/${mac}/local-ipv4s" | tail -n +2); do
					echo "${alias},on,"
				done > /var/ipfire/ethernet/aliases
				;;

			# GREEN
			1)
				(
					echo "GREEN_DEV=green0"
					echo "GREEN_MACADDR=${mac}"
					echo "GREEN_DESCRIPTION='${interface_id}'"
					echo "GREEN_ADDRESS=${ipv4_address}"
					echo "GREEN_NETMASK=${netmask}"
					echo "GREEN_NETADDRESS=${netaddress}"
					echo "GREEN_BROADCAST=${broadcast}"
				) >> /var/ipfire/ethernet/settings
				;;
		esac
	done

	# DEBUG
	cat /var/ipfire/ethernet/settings

	# Import SSH keys
	local line
	for line in $(get "public-keys/"); do
		local key_no="${line%=*}"

		local key="$(get public-keys/${key_no}/openssh-key)"
		if [ -n "${key}" ] && ! grep -q "^${key}$" /root/.ssh/authorized_keys 2>/dev/null; then
			mkdir -p /root/.ssh
			chmod 700 /root/.ssh

			echo "${key}" >> /root/.ssh/authorized_keys
			chmod 600 /root/.ssh/authorized_keys
		fi
	done

	# Enable SSH
	touch /var/ipfire/remote/enablessh
	chown nobody:nobody /var/ipfire/remote/enablessh

	# Enable SSH key authentication
	sed -e "s/^ENABLE_SSH_KEYS=.*/ENABLE_SSH_KEYS=on/" -i /var/ipfire/remote/settings

	# Actions performed only on the very first start
	if [ ! -e "/var/ipfire/main/firstsetup_ok" ]; then
		# Firewall rules for SSH and WEBIF
		(
			echo "1,ACCEPT,INPUTFW,ON,std_net_src,ALL,ipfire,RED1,,TCP,,,ON,,,cust_srv,SSH,,,,,,,,,,,00:00,00:00,,AUTO,,dnat,,,,,second"
			echo "2,ACCEPT,INPUTFW,ON,std_net_src,ALL,ipfire,RED1,,TCP,,,ON,,,TGT_PORT,444,,,,,,,,,,,00:00,00:00,,AUTO,,dnat,,,,,second"
		) >> /var/ipfire/firewall/input

		# This script has now completed the first steps of setup
		touch /var/ipfire/main/firstsetup_ok
	fi

	# All done
	echo_ok
}

case "${reason}" in
	PREINIT)
		# Bring up the interface
		ip link set "${interface}" up
		;;

	BOUND|RENEW|REBIND|REBOOT)
		# Remove any previous IP addresses
		ip addr flush dev "${interface}"

		# Add (or re-add) the new IP address
		ip addr add "${new_ip_address}/${new_subnet_mask}" dev "${interface}"

		# Add the default route
		ip route add default via "${new_routers}"

		# Import AWS configuration
		import_aws_configuration
		;;

	EXPIRE|FAIL|RELEASE|STOP)
		# Remove all IP addresses
		ip addr flush dev "${interface}"
		;;

	*)
		echo "Unhandled reason: ${reason}" >&2
		exit 2
		;;
esac

# Terminate
exit 0