[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 -X
	iptables -t nat -X
	iptables -t mangle -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 chain
	iptables -N CONNTRACK
	iptables -A CONNTRACK -m conntrack --ctstate ESTABLISHED,RELATED -j ACCEPT
	iptables -A CONNTRACK -m conntrack --ctstate INVALID -j DROP

	# 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
			MASQUERADE_GREEN="off"
		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 "Loading firewall modules into the kernel"
	modprobe iptable_nat || failed=1
	for i in $(find /lib/modules/$(uname -r) -name nf_conntrack*); do
		modprobe $(basename $i | cut -d. -f1) || failed=1
	done
	for i in $(find /lib/modules/$(uname -r) -name nf_nat*); do
		modprobe $(basename $i | cut -d. -f1) || failed=1
	done
	(exit ${failed})
	evaluate_retval

	if [ -e /var/ipfire/main/disable_nf_sip ]; then
		rmmod nf_nat_sip
		rmmod nf_conntrack_sip
		rmmod nf_nat_h323
		rmmod nf_conntrack_h323
	fi

	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
	24	iptables -X
	25	iptables -t nat -X
	26	iptables -t mangle -X
3a1019f6 MT	27
3a1019f6 MT	28	# Set up policies
c581b670 MT	29	iptables -P INPUT DROP
	30	iptables -P FORWARD DROP
	31	iptables -P OUTPUT ACCEPT
3a1019f6 MT	32
3a1019f6 MT	33	# Empty LOG_DROP and LOG_REJECT chains
c581b670 MT	34	iptables -N LOG_DROP
	35	iptables -A LOG_DROP -m limit --limit 10/minute -j LOG
	36	iptables -A LOG_DROP -j DROP
	37	iptables -N LOG_REJECT
	38	iptables -A LOG_REJECT -m limit --limit 10/minute -j LOG
	39	iptables -A LOG_REJECT -j REJECT
3a1019f6 MT	40
	41	# This chain will log, then DROPs packets with certain bad combinations
	42	# of flags might indicate a port-scan attempt (xmas, null, etc)
c581b670	43	iptables -N PSCAN
5595bc03	44	if [ "$DROPPORTSCAN" == "on" ]; then
c581b670 MT	45	iptables -A PSCAN -p tcp -m limit --limit 10/minute -j LOG --log-prefix "DROP_TCP Scan " -m comment --comment "DROP_TCP PScan"
	46	iptables -A PSCAN -p udp -m limit --limit 10/minute -j LOG --log-prefix "DROP_UDP Scan " -m comment --comment "DROP_UDP PScan"
	47	iptables -A PSCAN -p icmp -m limit --limit 10/minute -j LOG --log-prefix "DROP_ICMP Scan " -m comment --comment "DROP_ICMP PScan"
	48	iptables -A PSCAN -f -m limit --limit 10/minute -j LOG --log-prefix "DROP_FRAG Scan " -m comment --comment "DROP_FRAG PScan"
5595bc03	49	fi
c581b670	50	iptables -A PSCAN -j DROP -m comment --comment "DROP_PScan"
3a1019f6 MT	51
	52	# New tcp packets without SYN set - could well be an obscure type of port scan
	53	# that's not covered above, may just be a broken windows machine
c581b670	54	iptables -N NEWNOTSYN
5595bc03	55	if [ "$DROPNEWNOTSYN" == "on" ]; then
c581b670	56	iptables -A NEWNOTSYN -m limit --limit 10/minute -j LOG --log-prefix "DROP_NEWNOTSYN "
5595bc03	57	fi
c581b670	58	iptables -A NEWNOTSYN -j DROP -m comment --comment "DROP_NEWNOTSYN"
3a1019f6 MT	59
3a1019f6 MT	60	# Chain to contain all the rules relating to bad TCP flags
c581b670	61	iptables -N BADTCP
3a1019f6	62
c581b670 MT	63	# Don't check loopback
c581b670 MT	64	iptables -A BADTCP -i lo -j RETURN
d8158ca6	65
3a1019f6	66	# Disallow packets frequently used by port-scanners
dccbf1bf AF	67	# NMAP FIN/URG/PSH (XMAS scan)
	68	iptables -A BADTCP -p tcp --tcp-flags ALL FIN,URG,PSH -j PSCAN
	69	# SYN/RST/ACK/FIN/URG
	70	iptables -A BADTCP -p tcp --tcp-flags ALL SYN,RST,ACK,FIN,URG -j PSCAN
	71	# ALL/ALL
	72	iptables -A BADTCP -p tcp --tcp-flags ALL ALL -j PSCAN
	73	# FIN Stealth
c581b670	74	iptables -A BADTCP -p tcp --tcp-flags ALL FIN -j PSCAN
3a1019f6	75	# SYN/RST (also catches xmas variants that set SYN+RST+...)
c581b670	76	iptables -A BADTCP -p tcp --tcp-flags SYN,RST SYN,RST -j PSCAN
3a1019f6	77	# SYN/FIN (QueSO or nmap OS probe)
c581b670	78	iptables -A BADTCP -p tcp --tcp-flags SYN,FIN SYN,FIN -j PSCAN
dccbf1bf AF	79	# Null
dccbf1bf AF	80	iptables -A BADTCP -p tcp --tcp-flags ALL NONE -j PSCAN
3a1019f6	81	# NEW TCP without SYN
c581b670	82	iptables -A BADTCP -p tcp ! --syn -m conntrack --ctstate NEW -j NEWNOTSYN
b85d2a98	83
c581b670 MT	84	iptables -A INPUT -p tcp -j BADTCP
c581b670 MT	85	iptables -A FORWARD -p tcp -j BADTCP
c0359d6d	86
b85d2a98	87	# Connection tracking chain
c581b670 MT	88	iptables -N CONNTRACK
c581b670 MT	89	iptables -A CONNTRACK -m conntrack --ctstate ESTABLISHED,RELATED -j ACCEPT
dccbf1bf	90	iptables -A CONNTRACK -m conntrack --ctstate INVALID -j DROP
3a1019f6	91
3a1019f6	92	# Fix for braindead ISP's
c581b670	93	iptables -A FORWARD -p tcp --tcp-flags SYN,RST SYN -j TCPMSS --clamp-mss-to-pmtu
3a1019f6 MT	94
3a1019f6 MT	95	# CUSTOM chains, can be used by the users themselves
c581b670 MT	96	iptables -N CUSTOMINPUT
	97	iptables -A INPUT -j CUSTOMINPUT
	98	iptables -N CUSTOMFORWARD
	99	iptables -A FORWARD -j CUSTOMFORWARD
	100	iptables -N CUSTOMOUTPUT
	101	iptables -A OUTPUT -j CUSTOMOUTPUT
	102	iptables -t nat -N CUSTOMPREROUTING
	103	iptables -t nat -A PREROUTING -j CUSTOMPREROUTING
	104	iptables -t nat -N CUSTOMPOSTROUTING
	105	iptables -t nat -A POSTROUTING -j CUSTOMPOSTROUTING
3a1019f6	106
2a5b19c5 AF	107	# P2PBLOCK
	108	iptables -N P2PBLOCK
	109	iptables -A INPUT -j P2PBLOCK
	110	iptables -A FORWARD -j P2PBLOCK
	111	iptables -A OUTPUT -j P2PBLOCK
	112
815eaff4	113	# Guardian (IPS) chains
c581b670 MT	114	iptables -N GUARDIAN
	115	iptables -A INPUT -j GUARDIAN
	116	iptables -A FORWARD -j GUARDIAN
815eaff4	117
80fbd899 MT	118	# Block non-established IPsec networks
	119	iptables -N IPSECBLOCK
	120	iptables -A FORWARD -m policy --dir out --pol none -j IPSECBLOCK
	121	iptables -A OUTPUT -m policy --dir out --pol none -j IPSECBLOCK
	122
1e555330	123	# Block OpenVPN transfer networks
c581b670	124	iptables -N OVPNBLOCK
a0a5c14f	125	iptables -A INPUT -i tun+ -j OVPNBLOCK
a0a5c14f MT	126	iptables -A FORWARD -i tun+ -j OVPNBLOCK
a0a5c14f MT	127	iptables -A FORWARD -o tun+ -j OVPNBLOCK
1e555330	128
51ab1de1	129	# OpenVPN transfer network translation
c581b670 MT	130	iptables -t nat -N OVPNNAT
c581b670 MT	131	iptables -t nat -A POSTROUTING -j OVPNNAT
51ab1de1	132
daa1ceba	133	# IPTV chains for IGMPPROXY
c581b670 MT	134	iptables -N IPTVINPUT
	135	iptables -A INPUT -j IPTVINPUT
	136	iptables -N IPTVFORWARD
	137	iptables -A FORWARD -j IPTVFORWARD
daa1ceba	138
8e59a602 MT	139	# Allow to ping the firewall.
	140	iptables -N ICMPINPUT
	141	iptables -A INPUT -j ICMPINPUT
	142	iptables -A ICMPINPUT -p icmp --icmp-type 8 -j ACCEPT
3a1019f6	143
afc611d4	144	# Accept everything on loopback
c581b670 MT	145	iptables -N LOOPBACK
	146	iptables -A LOOPBACK -i lo -j ACCEPT
	147	iptables -A LOOPBACK -o lo -j ACCEPT
afc611d4	148
3b9a23ce	149	# Filter all packets with loopback addresses on non-loopback interfaces.
c581b670 MT	150	iptables -A LOOPBACK -s 127.0.0.0/8 -j DROP
c581b670 MT	151	iptables -A LOOPBACK -d 127.0.0.0/8 -j DROP
3b9a23ce MT	152
3b9a23ce MT	153	for i in INPUT FORWARD OUTPUT; do
c581b670	154	iptables -A ${i} -j LOOPBACK
3b9a23ce	155	done
afc611d4	156
3a1019f6	157	# Accept everything connected
b85d2a98	158	for i in INPUT FORWARD OUTPUT; do
c581b670	159	iptables -A ${i} -j CONNTRACK
b85d2a98 MT	160	done
b85d2a98 MT	161
8490e496 MT	162	# Allow DHCP
	163	iptables -N DHCPINPUT
	164	iptables -A DHCPINPUT -p udp --sport 68 --dport 67 -j ACCEPT
	165	iptables -A DHCPINPUT -p tcp --sport 68 --dport 67 -j ACCEPT
	166
	167	iptables -N DHCPOUTPUT
	168	iptables -A DHCPOUTPUT -p udp --sport 67 --dport 68 -j ACCEPT
	169	iptables -A DHCPOUTPUT -p tcp --sport 67 --dport 68 -j ACCEPT
	170
	171	# Allow DHCP on GREEN
	172	iptables -N DHCPGREENINPUT
	173	iptables -N DHCPGREENOUTPUT
	174	if [ -n "${GREEN_DEV}" ]; then
	175	iptables -A INPUT -i "${GREEN_DEV}" -j DHCPGREENINPUT
	176	iptables -A OUTPUT -o "${GREEN_DEV}" -j DHCPGREENOUTPUT
	177	fi
	178
	179	# allow DHCP on BLUE to be turned on/off
	180	iptables -N DHCPBLUEINPUT
	181	iptables -N DHCPBLUEOUTPUT
	182	if [ -n "${BLUE_DEV}" ]; then
	183	iptables -A INPUT -i "${BLUE_DEV}" -j DHCPBLUEINPUT
	184	iptables -A OUTPUT -o "${BLUE_DEV}" -j DHCPBLUEOUTPUT
	185	fi
	186
cab02e2a SS	187	# GeoIP block
	188	iptables -N GEOIPBLOCK
	189	iptables -A INPUT -j GEOIPBLOCK
	190	iptables -A FORWARD -j GEOIPBLOCK
	191
5fd30232	192	# trafic from ipsecX/TUN/TAP interfaces, before "-i GREEN_DEV" accept everything
c581b670 MT	193	iptables -N IPSECINPUT
	194	iptables -N IPSECFORWARD
	195	iptables -N IPSECOUTPUT
	196	iptables -A INPUT -j IPSECINPUT
	197	iptables -A FORWARD -j IPSECFORWARD
	198	iptables -A OUTPUT -j IPSECOUTPUT
	199	iptables -t nat -N IPSECNAT
	200	iptables -t nat -A POSTROUTING -j IPSECNAT
b68e5c14	201
3a1019f6	202	# localhost and ethernet.
c0e0848f MT	203	# Always allow accessing the web GUI from GREEN.
	204	iptables -N GUIINPUT
	205	iptables -A INPUT -j GUIINPUT
	206	iptables -A GUIINPUT -i "${GREEN_DEV}" -p tcp --dport 444 -j ACCEPT
8490e496	207
81393987	208	# WIRELESS chains
c581b670 MT	209	iptables -N WIRELESSINPUT
	210	iptables -A INPUT -m conntrack --ctstate NEW -j WIRELESSINPUT
	211	iptables -N WIRELESSFORWARD
	212	iptables -A FORWARD -m conntrack --ctstate NEW -j WIRELESSFORWARD
987b75bc	213
ab4876ad	214	# OpenVPN
c581b670 MT	215	iptables -N OVPNINPUT
c581b670 MT	216	iptables -A INPUT -j OVPNINPUT
ab4876ad	217
987b75bc	218	# TOR
c581b670 MT	219	iptables -N TOR_INPUT
c581b670 MT	220	iptables -A INPUT -j TOR_INPUT
12dcfbbd	221
d5f1422d	222	# Jump into the actual firewall ruleset.
c581b670 MT	223	iptables -N INPUTFW
c581b670 MT	224	iptables -A INPUT -j INPUTFW
d5f1422d	225
c581b670 MT	226	iptables -N OUTGOINGFW
c581b670 MT	227	iptables -A OUTPUT -j OUTGOINGFW
d5f1422d	228
c581b670 MT	229	iptables -N FORWARDFW
c581b670 MT	230	iptables -A FORWARD -j FORWARDFW
d5f1422d	231
fac38614	232	# SNAT rules
c581b670 MT	233	iptables -t nat -N NAT_SOURCE
c581b670 MT	234	iptables -t nat -A POSTROUTING -j NAT_SOURCE
fac38614	235
bb12dd7b	236	# Custom prerouting chains (for transparent proxy)
c581b670 MT	237	iptables -t nat -N SQUID
c581b670 MT	238	iptables -t nat -A PREROUTING -j SQUID
bb12dd7b MT	239
bb12dd7b MT	240	# DNAT rules
c581b670 MT	241	iptables -t nat -N NAT_DESTINATION
c581b670 MT	242	iptables -t nat -A PREROUTING -j NAT_DESTINATION
99f11a16	243	iptables -t nat -A OUTPUT -j NAT_DESTINATION
bb12dd7b	244
6e87f0aa MT	245	iptables -t mangle -N NAT_DESTINATION
	246	iptables -t mangle -A PREROUTING -j NAT_DESTINATION
	247
	248	iptables -t nat -N NAT_DESTINATION_FIX
	249	iptables -t nat -A POSTROUTING -j NAT_DESTINATION_FIX
	250
	251	iptables -t nat -A NAT_DESTINATION_FIX \
	252	-m mark --mark 1 -j SNAT --to-source "${GREEN_ADDRESS}"
	253
	254	if [ -n "${BLUE_ADDRESS}" ]; then
	255	iptables -t nat -A NAT_DESTINATION_FIX \
	256	-m mark --mark 2 -j SNAT --to-source "${BLUE_ADDRESS}"
	257	fi
	258
	259	if [ -n "${ORANGE_ADDRESS}" ]; then
	260	iptables -t nat -A NAT_DESTINATION_FIX \
	261	-m mark --mark 3 -j SNAT --to-source "${ORANGE_ADDRESS}"
	262	fi
	263
7e7495b3	264	# upnp chain for our upnp daemon
c581b670 MT	265	iptables -t nat -N UPNPFW
	266	iptables -t nat -A PREROUTING -j UPNPFW
	267	iptables -N UPNPFW
	268	iptables -A FORWARD -m conntrack --ctstate NEW -j UPNPFW
3a1019f6	269
6e87f0aa MT	270	# RED chain, used for the red interface
	271	iptables -N REDINPUT
	272	iptables -A INPUT -j REDINPUT
	273	iptables -N REDFORWARD
	274	iptables -A FORWARD -j REDFORWARD
	275	iptables -t nat -N REDNAT
	276	iptables -t nat -A POSTROUTING -j REDNAT
	277
80fbd899 MT	278	# Populate IPsec block chain
	279	/usr/lib/firewall/ipsec-block
	280
ab4876ad MT	281	# Apply OpenVPN firewall rules
ab4876ad MT	282	/usr/local/bin/openvpnctrl --firewall-rules
ff4770c7 AM	283
	284	# run wirelessctrl
	285	/usr/local/bin/wirelessctrl
	286
c581b670 MT	287	# POLICY CHAIN
	288	iptables -N POLICYIN
	289	iptables -A INPUT -j POLICYIN
	290	iptables -N POLICYFWD
	291	iptables -A FORWARD -j POLICYFWD
	292	iptables -N POLICYOUT
	293	iptables -A OUTPUT -j POLICYOUT
b324de14	294
bb383423	295	# Initialize firewall policies.
5d7faa45	296	/usr/sbin/firewall-policy
690b0bd7	297
bb383423	298	# Install firewall rules for the red interface.
4b12aa41 TE	299	iptables_red_up
	300
	301	# If red has not been brought up yet, we will
	302	# add the blocking rules for MASQUERADE
	303	if [ ! -e "/var/ipfire/red/active" ]; then
	304	iptables_red_down
	305	fi
ff4770c7	306	}
3a1019f6	307
4b12aa41	308	iptables_red_up() {
c581b670 MT	309	iptables -F REDINPUT
	310	iptables -F REDFORWARD
	311	iptables -t nat -F REDNAT
3a1019f6	312
ff4770c7 AM	313	# PPPoE / PPTP Device
	314	if [ "$IFACE" != "" ]; then
	315	# PPPoE / PPTP
	316	if [ "$DEVICE" != "" ]; then
c581b670	317	iptables -A REDINPUT -i $DEVICE -j ACCEPT
ff4770c7 AM	318	fi
	319	if [ "$RED_TYPE" == "PPTP" -o "$RED_TYPE" == "PPPOE" ]; then
	320	if [ "$RED_DEV" != "" ]; then
c581b670	321	iptables -A REDINPUT -i $RED_DEV -j ACCEPT
ff4770c7 AM	322	fi
ff4770c7 AM	323	fi
3a1019f6	324	fi
ff4770c7 AM	325
	326	# PPTP over DHCP
	327	if [ "$DEVICE" != "" -a "$TYPE" == "PPTP" -a "$METHOD" == "DHCP" ]; then
c581b670 MT	328	iptables -A REDINPUT -p tcp --source-port 67 --destination-port 68 -i $DEVICE -j ACCEPT
c581b670 MT	329	iptables -A REDINPUT -p udp --source-port 67 --destination-port 68 -i $DEVICE -j ACCEPT
3a1019f6 MT	330	fi
3a1019f6 MT	331
ff4770c7 AM	332	# Orange pinholes
	333	if [ "$ORANGE_DEV" != "" ]; then
	334	# This rule enables a host on ORANGE network to connect to the outside
	335	# (only if we have a red connection)
	336	if [ "$IFACE" != "" ]; then
c581b670	337	iptables -A REDFORWARD -i $ORANGE_DEV -o $IFACE -j ACCEPT
ff4770c7	338	fi
3a1019f6	339	fi
c400fe4c	340
ff4770c7 AM	341	if [ "$IFACE" != "" -a -f /var/ipfire/red/active ]; then
	342	# DHCP
	343	if [ "$RED_DEV" != "" -a "$RED_TYPE" == "DHCP" ]; then
c581b670 MT	344	iptables -A REDINPUT -p tcp --source-port 67 --destination-port 68 -i $IFACE -j ACCEPT
c581b670 MT	345	iptables -A REDINPUT -p udp --source-port 67 --destination-port 68 -i $IFACE -j ACCEPT
ff4770c7 AM	346	fi
ff4770c7 AM	347	if [ "$METHOD" == "DHCP" -a "$PROTOCOL" == "RFC1483" ]; then
c581b670 MT	348	iptables -A REDINPUT -p tcp --source-port 67 --destination-port 68 -i $IFACE -j ACCEPT
c581b670 MT	349	iptables -A REDINPUT -p udp --source-port 67 --destination-port 68 -i $IFACE -j ACCEPT
ff4770c7 AM	350	fi
	351
	352	# Outgoing masquerading (don't masqerade IPSEC (mark 50))
c581b670	353	iptables -t nat -A REDNAT -m mark --mark 50 -o $IFACE -j RETURN
c926c637	354
83ef9c40 MT	355	if [ "$IFACE" = "$GREEN_DEV" ]; then
83ef9c40 MT	356	MASQUERADE_GREEN="off"
c926c637	357	fi
c400fe4c	358
983d471f	359	local NO_MASQ_NETWORKS
83ef9c40 MT	360
83ef9c40 MT	361	if [ "${MASQUERADE_GREEN}" = "off" ]; then
983d471f	362	NO_MASQ_NETWORKS="${NO_MASQ_NETWORKS} ${GREEN_NETADDRESS}/${GREEN_NETMASK}"
83ef9c40 MT	363	fi
	364
	365	if [ "${MASQUERADE_BLUE}" = "off" ]; then
983d471f	366	NO_MASQ_NETWORKS="${NO_MASQ_NETWORKS} ${BLUE_NETADDRESS}/${BLUE_NETMASK}"
83ef9c40 MT	367	fi
	368
	369	if [ "${MASQUERADE_ORANGE}" = "off" ]; then
983d471f	370	NO_MASQ_NETWORKS="${NO_MASQ_NETWORKS} ${ORANGE_NETADDRESS}/${ORANGE_NETMASK}"
83ef9c40 MT	371	fi
83ef9c40 MT	372
983d471f MT	373	local network
	374	for network in ${NO_MASQ_NETWORKS}; do
	375	iptables -t nat -A REDNAT -s "${network}" -o "${IFACE}" -j RETURN
83ef9c40 MT	376	done
	377
	378	# Masquerade everything else
	379	iptables -t nat -A REDNAT -o $IFACE -j MASQUERADE
6be0579b	380	fi
66f6b279 MT	381
66f6b279 MT	382	# Reload all rules.
55a5bcae	383	/usr/local/bin/firewallctrl
ff4770c7 AM	384	}
ff4770c7 AM	385
4b12aa41 TE	386	iptables_red_down() {
	387	# Prohibit packets to reach the masquerading rule
	388	# while the wan interface is down - this is required to
	389	# circumvent udp related NAT issues
	390	# http://forum.ipfire.org/index.php?topic=11127.0
e7204c2d MT	391	if [ -n "${IFACE}" ]; then
	392	iptables -F REDFORWARD
	393	iptables -A REDFORWARD -o "${IFACE}" -j DROP
	394	fi
4b12aa41 TE	395
	396	# Reload all rules.
	397	/usr/local/bin/firewallctrl
	398	}
	399
ff4770c7 AM	400	# See how we were called.
	401	case "$1" in
	402	start)
cdb725da MT	403	boot_mesg "Loading firewall modules into the kernel"
	404	modprobe iptable_nat \|\| failed=1
	405	for i in $(find /lib/modules/$(uname -r) -name nf_conntrack*); do
	406	modprobe $(basename $i \| cut -d. -f1) \|\| failed=1
	407	done
	408	for i in $(find /lib/modules/$(uname -r) -name nf_nat*); do
	409	modprobe $(basename $i \| cut -d. -f1) \|\| failed=1
	410	done
	411	(exit ${failed})
	412	evaluate_retval
	413
	414	if [ -e /var/ipfire/main/disable_nf_sip ]; then
	415	rmmod nf_nat_sip
	416	rmmod nf_conntrack_sip
	417	rmmod nf_nat_h323
	418	rmmod nf_conntrack_h323
	419	fi
	420
7d7740a4	421	boot_mesg "Setting up firewall"
ff4770c7	422	iptables_init
7d7740a4	423	evaluate_retval
6be0579b	424	;;
4b12aa41	425	reload\|up)
7d7740a4	426	boot_mesg "Reloading firewall"
4b12aa41	427	iptables_red_up
7d7740a4	428	evaluate_retval
3a1019f6	429	;;
4b12aa41 TE	430	down)
	431	boot_mesg "Disabling firewall access to RED"
	432	iptables_red_down
	433	evaluate_retval
	434	;;
3a1019f6	435	restart)
3a1019f6 MT	436	$0 start
	437	;;
	438	*)
ff4770c7	439	echo "Usage: $0 {start\|reload\|restart}"
3a1019f6 MT	440	exit 1
	441	;;
	442	esac
	443
	444	exit 0