[people/pmueller/ipfire-2.x.git] / src / initscripts / init.d / firewall

#!/bin/sh

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

eval $(/usr/local/bin/readhash /var/ipfire/ppp/settings)
eval $(/usr/local/bin/readhash /var/ipfire/ethernet/settings)
eval $(/usr/local/bin/readhash /var/ipfire/optionsfw/settings)
IFACE=`/bin/cat /var/ipfire/red/iface 2> /dev/null | /usr/bin/tr -d '\012'`

if [ -f /var/ipfire/red/device ]; then
	DEVICE=`/bin/cat /var/ipfire/red/device 2> /dev/null | /usr/bin/tr -d '\012'`
fi

function iptables() {
	/sbin/iptables --wait "$@"
}

iptables_init() {
	# Flush all rules and delete all custom chains
	iptables -F
	iptables -t nat -F
	iptables -t mangle -F
	iptables -t raw -F
	iptables -X
	iptables -t nat -X
	iptables -t mangle -X
	iptables -t raw -X

	# Set up policies
	iptables -P INPUT DROP
	iptables -P FORWARD DROP
	iptables -P OUTPUT ACCEPT

	# Empty LOG_DROP and LOG_REJECT chains
	iptables -N LOG_DROP
	iptables -A LOG_DROP   -m limit --limit 10/minute -j LOG
	iptables -A LOG_DROP   -j DROP
	iptables -N LOG_REJECT
	iptables -A LOG_REJECT -m limit --limit 10/minute -j LOG
	iptables -A LOG_REJECT -j REJECT

	# This chain will log, then DROPs packets with certain bad combinations
	# of flags might indicate a port-scan attempt (xmas, null, etc)
	iptables -N PSCAN
	if [ "$DROPPORTSCAN" == "on" ]; then
		iptables -A PSCAN -p tcp  -m limit --limit 10/minute -j LOG --log-prefix "DROP_TCP Scan " -m comment --comment "DROP_TCP PScan"
		iptables -A PSCAN -p udp  -m limit --limit 10/minute -j LOG --log-prefix "DROP_UDP Scan " -m comment --comment "DROP_UDP PScan"
		iptables -A PSCAN -p icmp -m limit --limit 10/minute -j LOG --log-prefix "DROP_ICMP Scan " -m comment --comment "DROP_ICMP PScan"
		iptables -A PSCAN -f      -m limit --limit 10/minute -j LOG --log-prefix "DROP_FRAG Scan " -m comment --comment "DROP_FRAG PScan"
	fi
	iptables -A PSCAN -j DROP -m comment --comment "DROP_PScan"

	# New tcp packets without SYN set - could well be an obscure type of port scan
	# that's not covered above, may just be a broken windows machine
	iptables -N NEWNOTSYN
	if [ "$DROPNEWNOTSYN" == "on" ]; then
		iptables -A NEWNOTSYN  -m limit --limit 10/minute -j LOG  --log-prefix "DROP_NEWNOTSYN "
	fi
	iptables -A NEWNOTSYN  -j DROP -m comment --comment "DROP_NEWNOTSYN"

	# Chain to contain all the rules relating to bad TCP flags
	iptables -N BADTCP

	# Don't check loopback
	iptables -A BADTCP -i lo -j RETURN

	# Disallow packets frequently used by port-scanners
	# NMAP FIN/URG/PSH (XMAS scan)
	iptables -A BADTCP -p tcp --tcp-flags ALL FIN,URG,PSH -j PSCAN
	# SYN/RST/ACK/FIN/URG
	iptables -A BADTCP -p tcp --tcp-flags ALL SYN,RST,ACK,FIN,URG -j PSCAN
	# ALL/ALL
	iptables -A BADTCP -p tcp --tcp-flags ALL ALL -j PSCAN
	# FIN Stealth
	iptables -A BADTCP -p tcp --tcp-flags ALL FIN -j PSCAN
	# SYN/RST (also catches xmas variants that set SYN+RST+...)
	iptables -A BADTCP -p tcp --tcp-flags SYN,RST SYN,RST -j PSCAN
	# SYN/FIN (QueSO or nmap OS probe)
	iptables -A BADTCP -p tcp --tcp-flags SYN,FIN SYN,FIN -j PSCAN
	# Null
	iptables -A BADTCP -p tcp --tcp-flags ALL NONE -j PSCAN
	# NEW TCP without SYN
	iptables -A BADTCP -p tcp ! --syn -m conntrack --ctstate NEW -j NEWNOTSYN

	iptables -A INPUT   -p tcp -j BADTCP
	iptables -A FORWARD -p tcp -j BADTCP

	# Connection tracking chains
	iptables -N CONNTRACK
	iptables -A CONNTRACK -m conntrack --ctstate ESTABLISHED -j ACCEPT
	iptables -A CONNTRACK -m conntrack --ctstate INVALID -j DROP
	iptables -A CONNTRACK -p icmp -m conntrack --ctstate RELATED -j ACCEPT
	iptables -t raw -N CONNTRACK
	iptables -t raw -A PREROUTING -j CONNTRACK

	# Conntrack helpers (https://home.regit.org/netfilter-en/secure-use-of-helpers/)

	# SIP
	if [ "${CONNTRACK_SIP}" = "on" ]; then
		iptables -A CONNTRACK -m conntrack --ctstate RELATED \
			-m helper --helper sip -j ACCEPT
		for proto in udp tcp; do
			iptables -t raw -A CONNTRACK -p "${proto}" --dport 5060 -j CT --helper sip
		done
	fi

	# H.323
	if [ "${CONNTRACK_H323}" = "on" ]; then
		iptables -A CONNTRACK -m conntrack --ctstate RELATED \
			-m helper --helper h323 -j ACCEPT

		# Gatekeeper RAS
		iptables -t raw -A CONNTRACK -p udp --dport 1719 -j CT --helper RAS

		# Q.931
		iptables -t raw -A CONNTRACK -p tcp --dport 1720 -j CT --helper Q.931
	fi

	# FTP
	if [ "${CONNTRACK_FTP}" = "on" ]; then
		iptables -A CONNTRACK -m conntrack --ctstate RELATED \
			-m helper --helper ftp -p tcp --dport 1024: -j ACCEPT
		iptables -t raw -A CONNTRACK -p tcp --dport 21 -j CT --helper ftp
	fi

	# PPTP
	if [ "${CONNTRACK_PPTP}" = "on" ]; then
		iptables -A CONNTRACK -m conntrack --ctstate RELATED \
			-m helper --helper pptp -j ACCEPT
		iptables -t raw -A CONNTRACK -p udp --dport 1723 -j CT --helper pptp
	fi

	# TFTP
	if [ "${CONNTRACK_TFTP}" = "on" ]; then
		iptables -A CONNTRACK -m conntrack --ctstate RELATED \
			-m helper --helper tftp -j ACCEPT
		iptables -t raw -A CONNTRACK -p udp --dport 69 -j CT --helper tftp
	fi

	# IRC
	if [ "${CONNTRACK_IRC}" = "on" ]; then
		iptables -A CONNTRACK -m conntrack --ctstate RELATED \
			-m helper --helper irc -j ACCEPT
		iptables -t raw -A CONNTRACK -p tcp --dport 6667 -j CT --helper irc
	fi

	# Amanda
	if [ "${CONNTRACK_AMANDA}" = "on" ]; then
		iptables -A CONNTRACK -m conntrack --ctstate RELATED \
			-m helper --helper amanda -j ACCEPT
		iptables -t raw -A CONNTRACK -p tcp -j CT --helper amanda
	fi

	# Fix for braindead ISP's
	iptables -A FORWARD -p tcp --tcp-flags SYN,RST SYN -j TCPMSS --clamp-mss-to-pmtu

	# CUSTOM chains, can be used by the users themselves
	iptables -N CUSTOMINPUT
	iptables -A INPUT -j CUSTOMINPUT
	iptables -N CUSTOMFORWARD
	iptables -A FORWARD -j CUSTOMFORWARD
	iptables -N CUSTOMOUTPUT
	iptables -A OUTPUT -j CUSTOMOUTPUT
	iptables -t nat -N CUSTOMPREROUTING
	iptables -t nat -A PREROUTING -j CUSTOMPREROUTING
	iptables -t nat -N CUSTOMPOSTROUTING
	iptables -t nat -A POSTROUTING -j CUSTOMPOSTROUTING

	# P2PBLOCK
	iptables -N P2PBLOCK
	iptables -A INPUT -j P2PBLOCK
	iptables -A FORWARD -j P2PBLOCK
	iptables -A OUTPUT -j P2PBLOCK
	
	# Guardian (IPS) chains
	iptables -N GUARDIAN
	iptables -A INPUT -j GUARDIAN
	iptables -A FORWARD -j GUARDIAN

	# Block non-established IPsec networks
	iptables -N IPSECBLOCK
	iptables -A FORWARD -m policy --dir out --pol none -j IPSECBLOCK
	iptables -A OUTPUT  -m policy --dir out --pol none -j IPSECBLOCK

	# Block OpenVPN transfer networks
	iptables -N OVPNBLOCK
	iptables -A INPUT   -i tun+ -j OVPNBLOCK
	iptables -A FORWARD -i tun+ -j OVPNBLOCK
	iptables -A FORWARD -o tun+ -j OVPNBLOCK

	# OpenVPN transfer network translation
	iptables -t nat -N OVPNNAT
	iptables -t nat -A POSTROUTING -j OVPNNAT

	# IPTV chains for IGMPPROXY
	iptables -N IPTVINPUT
	iptables -A INPUT -j IPTVINPUT
	iptables -N IPTVFORWARD
	iptables -A FORWARD -j IPTVFORWARD

	# Allow to ping the firewall.
	iptables -N ICMPINPUT
	iptables -A INPUT -j ICMPINPUT
	iptables -A ICMPINPUT -p icmp --icmp-type 8 -j ACCEPT

	# Accept everything on loopback
	iptables -N LOOPBACK
	iptables -A LOOPBACK -i lo -j ACCEPT
	iptables -A LOOPBACK -o lo -j ACCEPT

	# Filter all packets with loopback addresses on non-loopback interfaces.
	iptables -A LOOPBACK -s 127.0.0.0/8 -j DROP
	iptables -A LOOPBACK -d 127.0.0.0/8 -j DROP

	for i in INPUT FORWARD OUTPUT; do
		iptables -A ${i} -j LOOPBACK
	done

	# Accept everything connected
	for i in INPUT FORWARD OUTPUT; do
		iptables -A ${i} -j CONNTRACK
	done

	# Allow DHCP
	iptables -N DHCPINPUT
	iptables -A DHCPINPUT -p udp --sport 68 --dport 67 -j ACCEPT
	iptables -A DHCPINPUT -p tcp --sport 68 --dport 67 -j ACCEPT

	iptables -N DHCPOUTPUT
	iptables -A DHCPOUTPUT -p udp --sport 67 --dport 68 -j ACCEPT
	iptables -A DHCPOUTPUT -p tcp --sport 67 --dport 68 -j ACCEPT

	# Allow DHCP on GREEN
	iptables -N DHCPGREENINPUT
	iptables -N DHCPGREENOUTPUT
	if [ -n "${GREEN_DEV}" ]; then
		iptables -A INPUT  -i "${GREEN_DEV}" -j DHCPGREENINPUT
		iptables -A OUTPUT -o "${GREEN_DEV}" -j DHCPGREENOUTPUT
	fi

	# allow DHCP on BLUE to be turned on/off
	iptables -N DHCPBLUEINPUT
	iptables -N DHCPBLUEOUTPUT
	if [ -n "${BLUE_DEV}" ]; then
		iptables -A INPUT  -i "${BLUE_DEV}" -j DHCPBLUEINPUT
		iptables -A OUTPUT -o "${BLUE_DEV}" -j DHCPBLUEOUTPUT
	fi

	# GeoIP block
	iptables -N GEOIPBLOCK
	iptables -A INPUT -j GEOIPBLOCK
	iptables -A FORWARD -j GEOIPBLOCK

	# trafic from ipsecX/TUN/TAP interfaces, before "-i GREEN_DEV" accept everything
	iptables -N IPSECINPUT
	iptables -N IPSECFORWARD
	iptables -N IPSECOUTPUT
	iptables -A INPUT -j IPSECINPUT
	iptables -A FORWARD -j IPSECFORWARD
	iptables -A OUTPUT -j IPSECOUTPUT
	iptables -t nat -N IPSECNAT
	iptables -t nat -A POSTROUTING -j IPSECNAT

	# localhost and ethernet.
	# Always allow accessing the web GUI from GREEN.
	iptables -N GUIINPUT
	iptables -A INPUT -j GUIINPUT
	iptables -A GUIINPUT -i "${GREEN_DEV}" -p tcp --dport 444 -j ACCEPT

	# WIRELESS chains
	iptables -N WIRELESSINPUT
	iptables -A INPUT -m conntrack --ctstate NEW -j WIRELESSINPUT
	iptables -N WIRELESSFORWARD
	iptables -A FORWARD -m conntrack --ctstate NEW -j WIRELESSFORWARD

	# OpenVPN
	iptables -N OVPNINPUT
	iptables -A INPUT -j OVPNINPUT

	# TOR
	iptables -N TOR_INPUT
	iptables -A INPUT -j TOR_INPUT
	
	# Jump into the actual firewall ruleset.
	iptables -N INPUTFW
	iptables -A INPUT -j INPUTFW

	iptables -N OUTGOINGFW
	iptables -A OUTPUT -j OUTGOINGFW

	iptables -N FORWARDFW
	iptables -A FORWARD -j FORWARDFW

	# SNAT rules
	iptables -t nat -N NAT_SOURCE
	iptables -t nat -A POSTROUTING -j NAT_SOURCE

	# Custom prerouting chains (for transparent proxy)
	iptables -t nat -N SQUID
	iptables -t nat -A PREROUTING -j SQUID

	# DNAT rules
	iptables -t nat -N NAT_DESTINATION
	iptables -t nat -A PREROUTING -j NAT_DESTINATION
	iptables -t nat -A OUTPUT -j NAT_DESTINATION

	iptables -t mangle -N NAT_DESTINATION
	iptables -t mangle -A PREROUTING -j NAT_DESTINATION

	iptables -t nat -N NAT_DESTINATION_FIX
	iptables -t nat -A POSTROUTING -j NAT_DESTINATION_FIX

	iptables -t nat -A NAT_DESTINATION_FIX \
		-m mark --mark 1 -j SNAT --to-source "${GREEN_ADDRESS}"

	if [ -n "${BLUE_ADDRESS}" ]; then
		iptables -t nat -A NAT_DESTINATION_FIX \
			-m mark --mark 2 -j SNAT --to-source "${BLUE_ADDRESS}"
	fi

	if [ -n "${ORANGE_ADDRESS}" ]; then
		iptables -t nat -A NAT_DESTINATION_FIX \
			-m mark --mark 3 -j SNAT --to-source "${ORANGE_ADDRESS}"
	fi

	# upnp chain for our upnp daemon
	iptables -t nat -N UPNPFW
	iptables -t nat -A PREROUTING -j UPNPFW
	iptables -N UPNPFW
	iptables -A FORWARD -m conntrack --ctstate NEW -j UPNPFW

	# RED chain, used for the red interface
	iptables -N REDINPUT
	iptables -A INPUT -j REDINPUT
	iptables -N REDFORWARD
	iptables -A FORWARD -j REDFORWARD
	iptables -t nat -N REDNAT
	iptables -t nat -A POSTROUTING -j REDNAT

	# Populate IPsec block chain
	/usr/lib/firewall/ipsec-block

	# Apply OpenVPN firewall rules
	/usr/local/bin/openvpnctrl --firewall-rules

	# run wirelessctrl
	/usr/local/bin/wirelessctrl

	# POLICY CHAIN
	iptables -N POLICYIN
	iptables -A INPUT -j POLICYIN
	iptables -N POLICYFWD
	iptables -A FORWARD -j POLICYFWD
	iptables -N POLICYOUT
	iptables -A OUTPUT -j POLICYOUT

	# Initialize firewall policies.
	/usr/sbin/firewall-policy

	# Install firewall rules for the red interface.
	iptables_red_up

	# If red has not been brought up yet, we will
	# add the blocking rules for MASQUERADE
	if [ ! -e "/var/ipfire/red/active" ]; then
		iptables_red_down
	fi
}

iptables_red_up() {
	iptables -F REDINPUT
	iptables -F REDFORWARD
	iptables -t nat -F REDNAT

	# PPPoE / PPTP Device
	if [ "$IFACE" != "" ]; then
		# PPPoE / PPTP
		if [ "$DEVICE" != "" ]; then
			iptables -A REDINPUT -i $DEVICE -j ACCEPT
		fi
		if [ "$RED_TYPE" == "PPTP" -o "$RED_TYPE" == "PPPOE" ]; then
			if [ "$RED_DEV" != "" ]; then
				iptables -A REDINPUT -i $RED_DEV -j ACCEPT
			fi
		fi
	fi

	# PPTP over DHCP
	if [ "$DEVICE" != "" -a "$TYPE" == "PPTP" -a "$METHOD" == "DHCP" ]; then
		iptables -A REDINPUT -p tcp --source-port 67 --destination-port 68 -i $DEVICE -j ACCEPT
		iptables -A REDINPUT -p udp --source-port 67 --destination-port 68 -i $DEVICE -j ACCEPT
	fi

	# Orange pinholes
	if [ "$ORANGE_DEV" != "" ]; then
		# This rule enables a host on ORANGE network to connect to the outside
		# (only if we have a red connection)
		if [ "$IFACE" != "" ]; then
			iptables -A REDFORWARD -i $ORANGE_DEV -o $IFACE -j ACCEPT
		fi
	fi

	if [ "$IFACE" != "" -a -f /var/ipfire/red/active ]; then
		# DHCP
		if [ "$RED_DEV" != "" -a "$RED_TYPE" == "DHCP" ]; then
			iptables -A REDINPUT -p tcp --source-port 67 --destination-port 68 -i $IFACE -j ACCEPT
			iptables -A REDINPUT -p udp --source-port 67 --destination-port 68 -i $IFACE -j ACCEPT
		fi
		if [ "$METHOD" == "DHCP"  -a "$PROTOCOL" == "RFC1483" ]; then
			iptables -A REDINPUT -p tcp --source-port 67 --destination-port 68 -i $IFACE -j ACCEPT
			iptables -A REDINPUT -p udp --source-port 67 --destination-port 68 -i $IFACE -j ACCEPT
		fi

		# Outgoing masquerading (don't masqerade IPSEC (mark 50))
		iptables -t nat -A REDNAT -m mark --mark 50 -o $IFACE -j RETURN

		if [ "${IFACE}" = "${GREEN_DEV}" ]; then
			iptables -t nat -A REDNAT -i "${GREEN_DEV}" -o "${IFACE}" -j RETURN
		fi

		local NO_MASQ_NETWORKS

		if [ "${MASQUERADE_GREEN}" = "off" ]; then
			NO_MASQ_NETWORKS="${NO_MASQ_NETWORKS} ${GREEN_NETADDRESS}/${GREEN_NETMASK}"
		fi

		if [ "${MASQUERADE_BLUE}" = "off" ]; then
			NO_MASQ_NETWORKS="${NO_MASQ_NETWORKS} ${BLUE_NETADDRESS}/${BLUE_NETMASK}"
		fi

		if [ "${MASQUERADE_ORANGE}" = "off" ]; then
			NO_MASQ_NETWORKS="${NO_MASQ_NETWORKS} ${ORANGE_NETADDRESS}/${ORANGE_NETMASK}"
		fi

		local network
		for network in ${NO_MASQ_NETWORKS}; do
			iptables -t nat -A REDNAT -s "${network}" -o "${IFACE}" -j RETURN
		done

		# Masquerade everything else
		iptables -t nat -A REDNAT -o $IFACE -j MASQUERADE
	fi

	# Reload all rules.
	/usr/local/bin/firewallctrl
}

iptables_red_down() {
	# Prohibit packets to reach the masquerading rule
	# while the wan interface is down - this is required to
	# circumvent udp related NAT issues
	# http://forum.ipfire.org/index.php?topic=11127.0
	if [ -n "${IFACE}" ]; then
		iptables -F REDFORWARD
		iptables -A REDFORWARD -o "${IFACE}" -j DROP
	fi

	# Reload all rules.
	/usr/local/bin/firewallctrl
}

# See how we were called.
case "$1" in
  start)
	boot_mesg "Setting up firewall"
	iptables_init
	evaluate_retval
	;;
  reload|up)
	boot_mesg "Reloading firewall"
	iptables_red_up
	evaluate_retval
	;;
  down)
	boot_mesg "Disabling firewall access to RED"
	iptables_red_down
	evaluate_retval
	;;
  restart)
	$0 start
	;;
  *)
        echo "Usage: $0 {start|reload|restart}"
        exit 1
	;;
esac

exit 0
Commit	Line	Data
3a1019f6 MT	1	#!/bin/sh
3a1019f6 MT	2
0f5c5ce7 MT	3	. /etc/sysconfig/rc
	4	. ${rc_functions}
	5
3a1019f6 MT	6	eval $(/usr/local/bin/readhash /var/ipfire/ppp/settings)
3a1019f6 MT	7	eval $(/usr/local/bin/readhash /var/ipfire/ethernet/settings)
fe0cd647	8	eval $(/usr/local/bin/readhash /var/ipfire/optionsfw/settings)
3a1019f6 MT	9	IFACE=`/bin/cat /var/ipfire/red/iface 2> /dev/null \| /usr/bin/tr -d '\012'`
	10
	11	if [ -f /var/ipfire/red/device ]; then
	12	DEVICE=`/bin/cat /var/ipfire/red/device 2> /dev/null \| /usr/bin/tr -d '\012'`
	13	fi
	14
c581b670 MT	15	function iptables() {
	16	/sbin/iptables --wait "$@"
	17	}
	18
3a1019f6 MT	19	iptables_init() {
3a1019f6 MT	20	# Flush all rules and delete all custom chains
c581b670 MT	21	iptables -F
	22	iptables -t nat -F
	23	iptables -t mangle -F
b1109b8a	24	iptables -t raw -F
c581b670 MT	25	iptables -X
	26	iptables -t nat -X
	27	iptables -t mangle -X
b1109b8a	28	iptables -t raw -X
3a1019f6 MT	29
3a1019f6 MT	30	# Set up policies
c581b670 MT	31	iptables -P INPUT DROP
	32	iptables -P FORWARD DROP
	33	iptables -P OUTPUT ACCEPT
3a1019f6 MT	34
3a1019f6 MT	35	# Empty LOG_DROP and LOG_REJECT chains
c581b670 MT	36	iptables -N LOG_DROP
	37	iptables -A LOG_DROP -m limit --limit 10/minute -j LOG
	38	iptables -A LOG_DROP -j DROP
	39	iptables -N LOG_REJECT
	40	iptables -A LOG_REJECT -m limit --limit 10/minute -j LOG
	41	iptables -A LOG_REJECT -j REJECT
3a1019f6 MT	42
	43	# This chain will log, then DROPs packets with certain bad combinations
	44	# of flags might indicate a port-scan attempt (xmas, null, etc)
c581b670	45	iptables -N PSCAN
5595bc03	46	if [ "$DROPPORTSCAN" == "on" ]; then
c581b670 MT	47	iptables -A PSCAN -p tcp -m limit --limit 10/minute -j LOG --log-prefix "DROP_TCP Scan " -m comment --comment "DROP_TCP PScan"
	48	iptables -A PSCAN -p udp -m limit --limit 10/minute -j LOG --log-prefix "DROP_UDP Scan " -m comment --comment "DROP_UDP PScan"
	49	iptables -A PSCAN -p icmp -m limit --limit 10/minute -j LOG --log-prefix "DROP_ICMP Scan " -m comment --comment "DROP_ICMP PScan"
	50	iptables -A PSCAN -f -m limit --limit 10/minute -j LOG --log-prefix "DROP_FRAG Scan " -m comment --comment "DROP_FRAG PScan"
5595bc03	51	fi
c581b670	52	iptables -A PSCAN -j DROP -m comment --comment "DROP_PScan"
3a1019f6 MT	53
	54	# New tcp packets without SYN set - could well be an obscure type of port scan
	55	# that's not covered above, may just be a broken windows machine
c581b670	56	iptables -N NEWNOTSYN
5595bc03	57	if [ "$DROPNEWNOTSYN" == "on" ]; then
c581b670	58	iptables -A NEWNOTSYN -m limit --limit 10/minute -j LOG --log-prefix "DROP_NEWNOTSYN "
5595bc03	59	fi
c581b670	60	iptables -A NEWNOTSYN -j DROP -m comment --comment "DROP_NEWNOTSYN"
3a1019f6 MT	61
3a1019f6 MT	62	# Chain to contain all the rules relating to bad TCP flags
c581b670	63	iptables -N BADTCP
3a1019f6	64
c581b670 MT	65	# Don't check loopback
c581b670 MT	66	iptables -A BADTCP -i lo -j RETURN
d8158ca6	67
3a1019f6	68	# Disallow packets frequently used by port-scanners
dccbf1bf AF	69	# NMAP FIN/URG/PSH (XMAS scan)
	70	iptables -A BADTCP -p tcp --tcp-flags ALL FIN,URG,PSH -j PSCAN
	71	# SYN/RST/ACK/FIN/URG
	72	iptables -A BADTCP -p tcp --tcp-flags ALL SYN,RST,ACK,FIN,URG -j PSCAN
	73	# ALL/ALL
	74	iptables -A BADTCP -p tcp --tcp-flags ALL ALL -j PSCAN
	75	# FIN Stealth
c581b670	76	iptables -A BADTCP -p tcp --tcp-flags ALL FIN -j PSCAN
3a1019f6	77	# SYN/RST (also catches xmas variants that set SYN+RST+...)
c581b670	78	iptables -A BADTCP -p tcp --tcp-flags SYN,RST SYN,RST -j PSCAN
3a1019f6	79	# SYN/FIN (QueSO or nmap OS probe)
c581b670	80	iptables -A BADTCP -p tcp --tcp-flags SYN,FIN SYN,FIN -j PSCAN
dccbf1bf AF	81	# Null
dccbf1bf AF	82	iptables -A BADTCP -p tcp --tcp-flags ALL NONE -j PSCAN
3a1019f6	83	# NEW TCP without SYN
c581b670	84	iptables -A BADTCP -p tcp ! --syn -m conntrack --ctstate NEW -j NEWNOTSYN
b85d2a98	85
c581b670 MT	86	iptables -A INPUT -p tcp -j BADTCP
c581b670 MT	87	iptables -A FORWARD -p tcp -j BADTCP
c0359d6d	88
b1109b8a	89	# Connection tracking chains
c581b670	90	iptables -N CONNTRACK
b1109b8a	91	iptables -A CONNTRACK -m conntrack --ctstate ESTABLISHED -j ACCEPT
dccbf1bf	92	iptables -A CONNTRACK -m conntrack --ctstate INVALID -j DROP
0f535060	93	iptables -A CONNTRACK -p icmp -m conntrack --ctstate RELATED -j ACCEPT
b1109b8a MT	94	iptables -t raw -N CONNTRACK
	95	iptables -t raw -A PREROUTING -j CONNTRACK
	96
	97	# Conntrack helpers (https://home.regit.org/netfilter-en/secure-use-of-helpers/)
	98
	99	# SIP
d57c6162 MT	100	if [ "${CONNTRACK_SIP}" = "on" ]; then
	101	iptables -A CONNTRACK -m conntrack --ctstate RELATED \
	102	-m helper --helper sip -j ACCEPT
	103	for proto in udp tcp; do
	104	iptables -t raw -A CONNTRACK -p "${proto}" --dport 5060 -j CT --helper sip
	105	done
	106	fi
b1109b8a	107
c8f8bf32 MT	108	# H.323
	109	if [ "${CONNTRACK_H323}" = "on" ]; then
	110	iptables -A CONNTRACK -m conntrack --ctstate RELATED \
	111	-m helper --helper h323 -j ACCEPT
	112
	113	# Gatekeeper RAS
e2c72362	114	iptables -t raw -A CONNTRACK -p udp --dport 1719 -j CT --helper RAS
c8f8bf32 MT	115
c8f8bf32 MT	116	# Q.931
e2c72362	117	iptables -t raw -A CONNTRACK -p tcp --dport 1720 -j CT --helper Q.931
c8f8bf32 MT	118	fi
c8f8bf32 MT	119
b1109b8a	120	# FTP
d57c6162 MT	121	if [ "${CONNTRACK_FTP}" = "on" ]; then
	122	iptables -A CONNTRACK -m conntrack --ctstate RELATED \
	123	-m helper --helper ftp -p tcp --dport 1024: -j ACCEPT
	124	iptables -t raw -A CONNTRACK -p tcp --dport 21 -j CT --helper ftp
	125	fi
b1109b8a MT	126
b1109b8a MT	127	# PPTP
d57c6162 MT	128	if [ "${CONNTRACK_PPTP}" = "on" ]; then
	129	iptables -A CONNTRACK -m conntrack --ctstate RELATED \
	130	-m helper --helper pptp -j ACCEPT
	131	iptables -t raw -A CONNTRACK -p udp --dport 1723 -j CT --helper pptp
	132	fi
b1109b8a MT	133
b1109b8a MT	134	# TFTP
d57c6162 MT	135	if [ "${CONNTRACK_TFTP}" = "on" ]; then
	136	iptables -A CONNTRACK -m conntrack --ctstate RELATED \
	137	-m helper --helper tftp -j ACCEPT
	138	iptables -t raw -A CONNTRACK -p udp --dport 69 -j CT --helper tftp
	139	fi
3a1019f6	140
50354ffe MT	141	# IRC
	142	if [ "${CONNTRACK_IRC}" = "on" ]; then
	143	iptables -A CONNTRACK -m conntrack --ctstate RELATED \
	144	-m helper --helper irc -j ACCEPT
	145	iptables -t raw -A CONNTRACK -p tcp --dport 6667 -j CT --helper irc
	146	fi
	147
a93bf696 MT	148	# Amanda
	149	if [ "${CONNTRACK_AMANDA}" = "on" ]; then
	150	iptables -A CONNTRACK -m conntrack --ctstate RELATED \
	151	-m helper --helper amanda -j ACCEPT
2c4b9c50	152	iptables -t raw -A CONNTRACK -p tcp -j CT --helper amanda
a93bf696	153	fi
3a1019f6	154
3a1019f6	155	# Fix for braindead ISP's
c581b670	156	iptables -A FORWARD -p tcp --tcp-flags SYN,RST SYN -j TCPMSS --clamp-mss-to-pmtu
3a1019f6 MT	157
3a1019f6 MT	158	# CUSTOM chains, can be used by the users themselves
c581b670 MT	159	iptables -N CUSTOMINPUT
	160	iptables -A INPUT -j CUSTOMINPUT
	161	iptables -N CUSTOMFORWARD
	162	iptables -A FORWARD -j CUSTOMFORWARD
	163	iptables -N CUSTOMOUTPUT
	164	iptables -A OUTPUT -j CUSTOMOUTPUT
	165	iptables -t nat -N CUSTOMPREROUTING
	166	iptables -t nat -A PREROUTING -j CUSTOMPREROUTING
	167	iptables -t nat -N CUSTOMPOSTROUTING
	168	iptables -t nat -A POSTROUTING -j CUSTOMPOSTROUTING
3a1019f6	169
2a5b19c5 AF	170	# P2PBLOCK
	171	iptables -N P2PBLOCK
	172	iptables -A INPUT -j P2PBLOCK
	173	iptables -A FORWARD -j P2PBLOCK
	174	iptables -A OUTPUT -j P2PBLOCK
	175
815eaff4	176	# Guardian (IPS) chains
c581b670 MT	177	iptables -N GUARDIAN
	178	iptables -A INPUT -j GUARDIAN
	179	iptables -A FORWARD -j GUARDIAN
815eaff4	180
80fbd899 MT	181	# Block non-established IPsec networks
	182	iptables -N IPSECBLOCK
	183	iptables -A FORWARD -m policy --dir out --pol none -j IPSECBLOCK
	184	iptables -A OUTPUT -m policy --dir out --pol none -j IPSECBLOCK
	185
1e555330	186	# Block OpenVPN transfer networks
c581b670	187	iptables -N OVPNBLOCK
a0a5c14f	188	iptables -A INPUT -i tun+ -j OVPNBLOCK
a0a5c14f MT	189	iptables -A FORWARD -i tun+ -j OVPNBLOCK
a0a5c14f MT	190	iptables -A FORWARD -o tun+ -j OVPNBLOCK
1e555330	191
51ab1de1	192	# OpenVPN transfer network translation
c581b670 MT	193	iptables -t nat -N OVPNNAT
c581b670 MT	194	iptables -t nat -A POSTROUTING -j OVPNNAT
51ab1de1	195
daa1ceba	196	# IPTV chains for IGMPPROXY
c581b670 MT	197	iptables -N IPTVINPUT
	198	iptables -A INPUT -j IPTVINPUT
	199	iptables -N IPTVFORWARD
	200	iptables -A FORWARD -j IPTVFORWARD
daa1ceba	201
8e59a602 MT	202	# Allow to ping the firewall.
	203	iptables -N ICMPINPUT
	204	iptables -A INPUT -j ICMPINPUT
	205	iptables -A ICMPINPUT -p icmp --icmp-type 8 -j ACCEPT
3a1019f6	206
afc611d4	207	# Accept everything on loopback
c581b670 MT	208	iptables -N LOOPBACK
	209	iptables -A LOOPBACK -i lo -j ACCEPT
	210	iptables -A LOOPBACK -o lo -j ACCEPT
afc611d4	211
3b9a23ce	212	# Filter all packets with loopback addresses on non-loopback interfaces.
c581b670 MT	213	iptables -A LOOPBACK -s 127.0.0.0/8 -j DROP
c581b670 MT	214	iptables -A LOOPBACK -d 127.0.0.0/8 -j DROP
3b9a23ce MT	215
3b9a23ce MT	216	for i in INPUT FORWARD OUTPUT; do
c581b670	217	iptables -A ${i} -j LOOPBACK
3b9a23ce	218	done
afc611d4	219
3a1019f6	220	# Accept everything connected
b85d2a98	221	for i in INPUT FORWARD OUTPUT; do
c581b670	222	iptables -A ${i} -j CONNTRACK
b85d2a98 MT	223	done
b85d2a98 MT	224
8490e496 MT	225	# Allow DHCP
	226	iptables -N DHCPINPUT
	227	iptables -A DHCPINPUT -p udp --sport 68 --dport 67 -j ACCEPT
	228	iptables -A DHCPINPUT -p tcp --sport 68 --dport 67 -j ACCEPT
	229
	230	iptables -N DHCPOUTPUT
	231	iptables -A DHCPOUTPUT -p udp --sport 67 --dport 68 -j ACCEPT
	232	iptables -A DHCPOUTPUT -p tcp --sport 67 --dport 68 -j ACCEPT
	233
	234	# Allow DHCP on GREEN
	235	iptables -N DHCPGREENINPUT
	236	iptables -N DHCPGREENOUTPUT
	237	if [ -n "${GREEN_DEV}" ]; then
	238	iptables -A INPUT -i "${GREEN_DEV}" -j DHCPGREENINPUT
	239	iptables -A OUTPUT -o "${GREEN_DEV}" -j DHCPGREENOUTPUT
	240	fi
	241
	242	# allow DHCP on BLUE to be turned on/off
	243	iptables -N DHCPBLUEINPUT
	244	iptables -N DHCPBLUEOUTPUT
	245	if [ -n "${BLUE_DEV}" ]; then
	246	iptables -A INPUT -i "${BLUE_DEV}" -j DHCPBLUEINPUT
	247	iptables -A OUTPUT -o "${BLUE_DEV}" -j DHCPBLUEOUTPUT
	248	fi
	249
cab02e2a SS	250	# GeoIP block
	251	iptables -N GEOIPBLOCK
	252	iptables -A INPUT -j GEOIPBLOCK
	253	iptables -A FORWARD -j GEOIPBLOCK
	254
5fd30232	255	# trafic from ipsecX/TUN/TAP interfaces, before "-i GREEN_DEV" accept everything
c581b670 MT	256	iptables -N IPSECINPUT
	257	iptables -N IPSECFORWARD
	258	iptables -N IPSECOUTPUT
	259	iptables -A INPUT -j IPSECINPUT
	260	iptables -A FORWARD -j IPSECFORWARD
	261	iptables -A OUTPUT -j IPSECOUTPUT
	262	iptables -t nat -N IPSECNAT
	263	iptables -t nat -A POSTROUTING -j IPSECNAT
b68e5c14	264
3a1019f6	265	# localhost and ethernet.
c0e0848f MT	266	# Always allow accessing the web GUI from GREEN.
	267	iptables -N GUIINPUT
	268	iptables -A INPUT -j GUIINPUT
	269	iptables -A GUIINPUT -i "${GREEN_DEV}" -p tcp --dport 444 -j ACCEPT
8490e496	270
81393987	271	# WIRELESS chains
c581b670 MT	272	iptables -N WIRELESSINPUT
	273	iptables -A INPUT -m conntrack --ctstate NEW -j WIRELESSINPUT
	274	iptables -N WIRELESSFORWARD
	275	iptables -A FORWARD -m conntrack --ctstate NEW -j WIRELESSFORWARD
987b75bc	276
ab4876ad	277	# OpenVPN
c581b670 MT	278	iptables -N OVPNINPUT
c581b670 MT	279	iptables -A INPUT -j OVPNINPUT
ab4876ad	280
987b75bc	281	# TOR
c581b670 MT	282	iptables -N TOR_INPUT
c581b670 MT	283	iptables -A INPUT -j TOR_INPUT
12dcfbbd	284
d5f1422d	285	# Jump into the actual firewall ruleset.
c581b670 MT	286	iptables -N INPUTFW
c581b670 MT	287	iptables -A INPUT -j INPUTFW
d5f1422d	288
c581b670 MT	289	iptables -N OUTGOINGFW
c581b670 MT	290	iptables -A OUTPUT -j OUTGOINGFW
d5f1422d	291
c581b670 MT	292	iptables -N FORWARDFW
c581b670 MT	293	iptables -A FORWARD -j FORWARDFW
d5f1422d	294
fac38614	295	# SNAT rules
c581b670 MT	296	iptables -t nat -N NAT_SOURCE
c581b670 MT	297	iptables -t nat -A POSTROUTING -j NAT_SOURCE
fac38614	298
bb12dd7b	299	# Custom prerouting chains (for transparent proxy)
c581b670 MT	300	iptables -t nat -N SQUID
c581b670 MT	301	iptables -t nat -A PREROUTING -j SQUID
bb12dd7b MT	302
bb12dd7b MT	303	# DNAT rules
c581b670 MT	304	iptables -t nat -N NAT_DESTINATION
c581b670 MT	305	iptables -t nat -A PREROUTING -j NAT_DESTINATION
99f11a16	306	iptables -t nat -A OUTPUT -j NAT_DESTINATION
bb12dd7b	307
6e87f0aa MT	308	iptables -t mangle -N NAT_DESTINATION
	309	iptables -t mangle -A PREROUTING -j NAT_DESTINATION
	310
	311	iptables -t nat -N NAT_DESTINATION_FIX
	312	iptables -t nat -A POSTROUTING -j NAT_DESTINATION_FIX
	313
	314	iptables -t nat -A NAT_DESTINATION_FIX \
	315	-m mark --mark 1 -j SNAT --to-source "${GREEN_ADDRESS}"
	316
	317	if [ -n "${BLUE_ADDRESS}" ]; then
	318	iptables -t nat -A NAT_DESTINATION_FIX \
	319	-m mark --mark 2 -j SNAT --to-source "${BLUE_ADDRESS}"
	320	fi
	321
	322	if [ -n "${ORANGE_ADDRESS}" ]; then
	323	iptables -t nat -A NAT_DESTINATION_FIX \
	324	-m mark --mark 3 -j SNAT --to-source "${ORANGE_ADDRESS}"
	325	fi
	326
7e7495b3	327	# upnp chain for our upnp daemon
c581b670 MT	328	iptables -t nat -N UPNPFW
	329	iptables -t nat -A PREROUTING -j UPNPFW
	330	iptables -N UPNPFW
	331	iptables -A FORWARD -m conntrack --ctstate NEW -j UPNPFW
3a1019f6	332
6e87f0aa MT	333	# RED chain, used for the red interface
	334	iptables -N REDINPUT
	335	iptables -A INPUT -j REDINPUT
	336	iptables -N REDFORWARD
	337	iptables -A FORWARD -j REDFORWARD
	338	iptables -t nat -N REDNAT
	339	iptables -t nat -A POSTROUTING -j REDNAT
	340
80fbd899 MT	341	# Populate IPsec block chain
	342	/usr/lib/firewall/ipsec-block
	343
ab4876ad MT	344	# Apply OpenVPN firewall rules
ab4876ad MT	345	/usr/local/bin/openvpnctrl --firewall-rules
ff4770c7 AM	346
	347	# run wirelessctrl
	348	/usr/local/bin/wirelessctrl
	349
c581b670 MT	350	# POLICY CHAIN
	351	iptables -N POLICYIN
	352	iptables -A INPUT -j POLICYIN
	353	iptables -N POLICYFWD
	354	iptables -A FORWARD -j POLICYFWD
	355	iptables -N POLICYOUT
	356	iptables -A OUTPUT -j POLICYOUT
b324de14	357
bb383423	358	# Initialize firewall policies.
5d7faa45	359	/usr/sbin/firewall-policy
690b0bd7	360
bb383423	361	# Install firewall rules for the red interface.
4b12aa41 TE	362	iptables_red_up
	363
	364	# If red has not been brought up yet, we will
	365	# add the blocking rules for MASQUERADE
	366	if [ ! -e "/var/ipfire/red/active" ]; then
	367	iptables_red_down
	368	fi
ff4770c7	369	}
3a1019f6	370
4b12aa41	371	iptables_red_up() {
c581b670 MT	372	iptables -F REDINPUT
	373	iptables -F REDFORWARD
	374	iptables -t nat -F REDNAT
3a1019f6	375
ff4770c7 AM	376	# PPPoE / PPTP Device
	377	if [ "$IFACE" != "" ]; then
	378	# PPPoE / PPTP
	379	if [ "$DEVICE" != "" ]; then
c581b670	380	iptables -A REDINPUT -i $DEVICE -j ACCEPT
ff4770c7 AM	381	fi
	382	if [ "$RED_TYPE" == "PPTP" -o "$RED_TYPE" == "PPPOE" ]; then
	383	if [ "$RED_DEV" != "" ]; then
c581b670	384	iptables -A REDINPUT -i $RED_DEV -j ACCEPT
ff4770c7 AM	385	fi
ff4770c7 AM	386	fi
3a1019f6	387	fi
ff4770c7 AM	388
	389	# PPTP over DHCP
	390	if [ "$DEVICE" != "" -a "$TYPE" == "PPTP" -a "$METHOD" == "DHCP" ]; then
c581b670 MT	391	iptables -A REDINPUT -p tcp --source-port 67 --destination-port 68 -i $DEVICE -j ACCEPT
c581b670 MT	392	iptables -A REDINPUT -p udp --source-port 67 --destination-port 68 -i $DEVICE -j ACCEPT
3a1019f6 MT	393	fi
3a1019f6 MT	394
ff4770c7 AM	395	# Orange pinholes
	396	if [ "$ORANGE_DEV" != "" ]; then
	397	# This rule enables a host on ORANGE network to connect to the outside
	398	# (only if we have a red connection)
	399	if [ "$IFACE" != "" ]; then
c581b670	400	iptables -A REDFORWARD -i $ORANGE_DEV -o $IFACE -j ACCEPT
ff4770c7	401	fi
3a1019f6	402	fi
c400fe4c	403
ff4770c7 AM	404	if [ "$IFACE" != "" -a -f /var/ipfire/red/active ]; then
	405	# DHCP
	406	if [ "$RED_DEV" != "" -a "$RED_TYPE" == "DHCP" ]; then
c581b670 MT	407	iptables -A REDINPUT -p tcp --source-port 67 --destination-port 68 -i $IFACE -j ACCEPT
c581b670 MT	408	iptables -A REDINPUT -p udp --source-port 67 --destination-port 68 -i $IFACE -j ACCEPT
ff4770c7 AM	409	fi
ff4770c7 AM	410	if [ "$METHOD" == "DHCP" -a "$PROTOCOL" == "RFC1483" ]; then
c581b670 MT	411	iptables -A REDINPUT -p tcp --source-port 67 --destination-port 68 -i $IFACE -j ACCEPT
c581b670 MT	412	iptables -A REDINPUT -p udp --source-port 67 --destination-port 68 -i $IFACE -j ACCEPT
ff4770c7 AM	413	fi
	414
	415	# Outgoing masquerading (don't masqerade IPSEC (mark 50))
c581b670	416	iptables -t nat -A REDNAT -m mark --mark 50 -o $IFACE -j RETURN
c926c637	417
60fcb241 AF	418	if [ "${IFACE}" = "${GREEN_DEV}" ]; then
60fcb241 AF	419	iptables -t nat -A REDNAT -i "${GREEN_DEV}" -o "${IFACE}" -j RETURN
c926c637	420	fi
c400fe4c	421
983d471f	422	local NO_MASQ_NETWORKS
83ef9c40 MT	423
83ef9c40 MT	424	if [ "${MASQUERADE_GREEN}" = "off" ]; then
983d471f	425	NO_MASQ_NETWORKS="${NO_MASQ_NETWORKS} ${GREEN_NETADDRESS}/${GREEN_NETMASK}"
83ef9c40 MT	426	fi
	427
	428	if [ "${MASQUERADE_BLUE}" = "off" ]; then
983d471f	429	NO_MASQ_NETWORKS="${NO_MASQ_NETWORKS} ${BLUE_NETADDRESS}/${BLUE_NETMASK}"
83ef9c40 MT	430	fi
	431
	432	if [ "${MASQUERADE_ORANGE}" = "off" ]; then
983d471f	433	NO_MASQ_NETWORKS="${NO_MASQ_NETWORKS} ${ORANGE_NETADDRESS}/${ORANGE_NETMASK}"
83ef9c40 MT	434	fi
83ef9c40 MT	435
983d471f MT	436	local network
	437	for network in ${NO_MASQ_NETWORKS}; do
	438	iptables -t nat -A REDNAT -s "${network}" -o "${IFACE}" -j RETURN
83ef9c40 MT	439	done
	440
	441	# Masquerade everything else
	442	iptables -t nat -A REDNAT -o $IFACE -j MASQUERADE
6be0579b	443	fi
66f6b279 MT	444
66f6b279 MT	445	# Reload all rules.
55a5bcae	446	/usr/local/bin/firewallctrl
ff4770c7 AM	447	}
ff4770c7 AM	448
4b12aa41 TE	449	iptables_red_down() {
	450	# Prohibit packets to reach the masquerading rule
	451	# while the wan interface is down - this is required to
	452	# circumvent udp related NAT issues
	453	# http://forum.ipfire.org/index.php?topic=11127.0
e7204c2d MT	454	if [ -n "${IFACE}" ]; then
	455	iptables -F REDFORWARD
	456	iptables -A REDFORWARD -o "${IFACE}" -j DROP
	457	fi
4b12aa41 TE	458
	459	# Reload all rules.
	460	/usr/local/bin/firewallctrl
	461	}
	462
ff4770c7 AM	463	# See how we were called.
	464	case "$1" in
	465	start)
7d7740a4	466	boot_mesg "Setting up firewall"
ff4770c7	467	iptables_init
7d7740a4	468	evaluate_retval
6be0579b	469	;;
4b12aa41	470	reload\|up)
7d7740a4	471	boot_mesg "Reloading firewall"
4b12aa41	472	iptables_red_up
7d7740a4	473	evaluate_retval
3a1019f6	474	;;
4b12aa41 TE	475	down)
	476	boot_mesg "Disabling firewall access to RED"
	477	iptables_red_down
	478	evaluate_retval
	479	;;
3a1019f6	480	restart)
3a1019f6 MT	481	$0 start
	482	;;
	483	*)
ff4770c7	484	echo "Usage: $0 {start\|reload\|restart}"
3a1019f6 MT	485	exit 1
	486	;;
	487	esac
	488
	489	exit 0