[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 -t raw -N CONNTRACK
	iptables -t raw -A PREROUTING -j CONNTRACK

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

	# SIP
	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

	# FTP
	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

	# PPTP
	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

	# TFTP
	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

	# 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 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

	# 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

	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
b1109b8a MT	93	iptables -t raw -N CONNTRACK
	94	iptables -t raw -A PREROUTING -j CONNTRACK
	95
	96	# Conntrack helpers (https://home.regit.org/netfilter-en/secure-use-of-helpers/)
	97
	98	# SIP
	99	iptables -A CONNTRACK -m conntrack --ctstate RELATED \
	100	-m helper --helper sip -j ACCEPT
	101	for proto in udp tcp; do
	102	iptables -t raw -A CONNTRACK -p "${proto}" --dport 5060 -j CT --helper sip
	103	done
	104
	105	# FTP
	106	iptables -A CONNTRACK -m conntrack --ctstate RELATED \
	107	-m helper --helper ftp -p tcp --dport 1024: -j ACCEPT
	108	iptables -t raw -A CONNTRACK -p tcp --dport 21 -j CT --helper ftp
	109
	110	# PPTP
	111	iptables -A CONNTRACK -m conntrack --ctstate RELATED \
	112	-m helper --helper pptp -j ACCEPT
	113	iptables -t raw -A CONNTRACK -p udp --dport 1723 -j CT --helper pptp
	114
	115	# TFTP
	116	iptables -A CONNTRACK -m conntrack --ctstate RELATED \
	117	-m helper --helper tftp -j ACCEPT
	118	iptables -t raw -A CONNTRACK -p udp --dport 69 -j CT --helper tftp
3a1019f6	119
3a1019f6	120	# Fix for braindead ISP's
c581b670	121	iptables -A FORWARD -p tcp --tcp-flags SYN,RST SYN -j TCPMSS --clamp-mss-to-pmtu
3a1019f6 MT	122
3a1019f6 MT	123	# CUSTOM chains, can be used by the users themselves
c581b670 MT	124	iptables -N CUSTOMINPUT
	125	iptables -A INPUT -j CUSTOMINPUT
	126	iptables -N CUSTOMFORWARD
	127	iptables -A FORWARD -j CUSTOMFORWARD
	128	iptables -N CUSTOMOUTPUT
	129	iptables -A OUTPUT -j CUSTOMOUTPUT
	130	iptables -t nat -N CUSTOMPREROUTING
	131	iptables -t nat -A PREROUTING -j CUSTOMPREROUTING
	132	iptables -t nat -N CUSTOMPOSTROUTING
	133	iptables -t nat -A POSTROUTING -j CUSTOMPOSTROUTING
3a1019f6	134
2a5b19c5 AF	135	# P2PBLOCK
	136	iptables -N P2PBLOCK
	137	iptables -A INPUT -j P2PBLOCK
	138	iptables -A FORWARD -j P2PBLOCK
	139	iptables -A OUTPUT -j P2PBLOCK
	140
815eaff4	141	# Guardian (IPS) chains
c581b670 MT	142	iptables -N GUARDIAN
	143	iptables -A INPUT -j GUARDIAN
	144	iptables -A FORWARD -j GUARDIAN
815eaff4	145
1e555330	146	# Block OpenVPN transfer networks
c581b670	147	iptables -N OVPNBLOCK
a0a5c14f	148	iptables -A INPUT -i tun+ -j OVPNBLOCK
a0a5c14f MT	149	iptables -A FORWARD -i tun+ -j OVPNBLOCK
a0a5c14f MT	150	iptables -A FORWARD -o tun+ -j OVPNBLOCK
1e555330	151
51ab1de1	152	# OpenVPN transfer network translation
c581b670 MT	153	iptables -t nat -N OVPNNAT
c581b670 MT	154	iptables -t nat -A POSTROUTING -j OVPNNAT
51ab1de1	155
daa1ceba	156	# IPTV chains for IGMPPROXY
c581b670 MT	157	iptables -N IPTVINPUT
	158	iptables -A INPUT -j IPTVINPUT
	159	iptables -N IPTVFORWARD
	160	iptables -A FORWARD -j IPTVFORWARD
daa1ceba	161
8e59a602 MT	162	# Allow to ping the firewall.
	163	iptables -N ICMPINPUT
	164	iptables -A INPUT -j ICMPINPUT
	165	iptables -A ICMPINPUT -p icmp --icmp-type 8 -j ACCEPT
3a1019f6	166
afc611d4	167	# Accept everything on loopback
c581b670 MT	168	iptables -N LOOPBACK
	169	iptables -A LOOPBACK -i lo -j ACCEPT
	170	iptables -A LOOPBACK -o lo -j ACCEPT
afc611d4	171
3b9a23ce	172	# Filter all packets with loopback addresses on non-loopback interfaces.
c581b670 MT	173	iptables -A LOOPBACK -s 127.0.0.0/8 -j DROP
c581b670 MT	174	iptables -A LOOPBACK -d 127.0.0.0/8 -j DROP
3b9a23ce MT	175
3b9a23ce MT	176	for i in INPUT FORWARD OUTPUT; do
c581b670	177	iptables -A ${i} -j LOOPBACK
3b9a23ce	178	done
afc611d4	179
3a1019f6	180	# Accept everything connected
b85d2a98	181	for i in INPUT FORWARD OUTPUT; do
c581b670	182	iptables -A ${i} -j CONNTRACK
b85d2a98 MT	183	done
b85d2a98 MT	184
8490e496 MT	185	# Allow DHCP
	186	iptables -N DHCPINPUT
	187	iptables -A DHCPINPUT -p udp --sport 68 --dport 67 -j ACCEPT
	188	iptables -A DHCPINPUT -p tcp --sport 68 --dport 67 -j ACCEPT
	189
	190	iptables -N DHCPOUTPUT
	191	iptables -A DHCPOUTPUT -p udp --sport 67 --dport 68 -j ACCEPT
	192	iptables -A DHCPOUTPUT -p tcp --sport 67 --dport 68 -j ACCEPT
	193
	194	# Allow DHCP on GREEN
	195	iptables -N DHCPGREENINPUT
	196	iptables -N DHCPGREENOUTPUT
	197	if [ -n "${GREEN_DEV}" ]; then
	198	iptables -A INPUT -i "${GREEN_DEV}" -j DHCPGREENINPUT
	199	iptables -A OUTPUT -o "${GREEN_DEV}" -j DHCPGREENOUTPUT
	200	fi
	201
	202	# allow DHCP on BLUE to be turned on/off
	203	iptables -N DHCPBLUEINPUT
	204	iptables -N DHCPBLUEOUTPUT
	205	if [ -n "${BLUE_DEV}" ]; then
	206	iptables -A INPUT -i "${BLUE_DEV}" -j DHCPBLUEINPUT
	207	iptables -A OUTPUT -o "${BLUE_DEV}" -j DHCPBLUEOUTPUT
	208	fi
	209
cab02e2a SS	210	# GeoIP block
	211	iptables -N GEOIPBLOCK
	212	iptables -A INPUT -j GEOIPBLOCK
	213	iptables -A FORWARD -j GEOIPBLOCK
	214
5fd30232	215	# trafic from ipsecX/TUN/TAP interfaces, before "-i GREEN_DEV" accept everything
c581b670 MT	216	iptables -N IPSECINPUT
	217	iptables -N IPSECFORWARD
	218	iptables -N IPSECOUTPUT
	219	iptables -A INPUT -j IPSECINPUT
	220	iptables -A FORWARD -j IPSECFORWARD
	221	iptables -A OUTPUT -j IPSECOUTPUT
	222	iptables -t nat -N IPSECNAT
	223	iptables -t nat -A POSTROUTING -j IPSECNAT
b68e5c14	224
3a1019f6	225	# localhost and ethernet.
c0e0848f MT	226	# Always allow accessing the web GUI from GREEN.
	227	iptables -N GUIINPUT
	228	iptables -A INPUT -j GUIINPUT
	229	iptables -A GUIINPUT -i "${GREEN_DEV}" -p tcp --dport 444 -j ACCEPT
8490e496	230
81393987	231	# WIRELESS chains
c581b670 MT	232	iptables -N WIRELESSINPUT
	233	iptables -A INPUT -m conntrack --ctstate NEW -j WIRELESSINPUT
	234	iptables -N WIRELESSFORWARD
	235	iptables -A FORWARD -m conntrack --ctstate NEW -j WIRELESSFORWARD
987b75bc	236
ab4876ad	237	# OpenVPN
c581b670 MT	238	iptables -N OVPNINPUT
c581b670 MT	239	iptables -A INPUT -j OVPNINPUT
ab4876ad	240
987b75bc	241	# TOR
c581b670 MT	242	iptables -N TOR_INPUT
c581b670 MT	243	iptables -A INPUT -j TOR_INPUT
12dcfbbd	244
d5f1422d	245	# Jump into the actual firewall ruleset.
c581b670 MT	246	iptables -N INPUTFW
c581b670 MT	247	iptables -A INPUT -j INPUTFW
d5f1422d	248
c581b670 MT	249	iptables -N OUTGOINGFW
c581b670 MT	250	iptables -A OUTPUT -j OUTGOINGFW
d5f1422d	251
c581b670 MT	252	iptables -N FORWARDFW
c581b670 MT	253	iptables -A FORWARD -j FORWARDFW
d5f1422d	254
fac38614	255	# SNAT rules
c581b670 MT	256	iptables -t nat -N NAT_SOURCE
c581b670 MT	257	iptables -t nat -A POSTROUTING -j NAT_SOURCE
fac38614	258
bb12dd7b	259	# Custom prerouting chains (for transparent proxy)
c581b670 MT	260	iptables -t nat -N SQUID
c581b670 MT	261	iptables -t nat -A PREROUTING -j SQUID
bb12dd7b MT	262
bb12dd7b MT	263	# DNAT rules
c581b670 MT	264	iptables -t nat -N NAT_DESTINATION
c581b670 MT	265	iptables -t nat -A PREROUTING -j NAT_DESTINATION
99f11a16	266	iptables -t nat -A OUTPUT -j NAT_DESTINATION
bb12dd7b	267
6e87f0aa MT	268	iptables -t mangle -N NAT_DESTINATION
	269	iptables -t mangle -A PREROUTING -j NAT_DESTINATION
	270
	271	iptables -t nat -N NAT_DESTINATION_FIX
	272	iptables -t nat -A POSTROUTING -j NAT_DESTINATION_FIX
	273
	274	iptables -t nat -A NAT_DESTINATION_FIX \
	275	-m mark --mark 1 -j SNAT --to-source "${GREEN_ADDRESS}"
	276
	277	if [ -n "${BLUE_ADDRESS}" ]; then
	278	iptables -t nat -A NAT_DESTINATION_FIX \
	279	-m mark --mark 2 -j SNAT --to-source "${BLUE_ADDRESS}"
	280	fi
	281
	282	if [ -n "${ORANGE_ADDRESS}" ]; then
	283	iptables -t nat -A NAT_DESTINATION_FIX \
	284	-m mark --mark 3 -j SNAT --to-source "${ORANGE_ADDRESS}"
	285	fi
	286
7e7495b3	287	# upnp chain for our upnp daemon
c581b670 MT	288	iptables -t nat -N UPNPFW
	289	iptables -t nat -A PREROUTING -j UPNPFW
	290	iptables -N UPNPFW
	291	iptables -A FORWARD -m conntrack --ctstate NEW -j UPNPFW
3a1019f6	292
6e87f0aa MT	293	# RED chain, used for the red interface
	294	iptables -N REDINPUT
	295	iptables -A INPUT -j REDINPUT
	296	iptables -N REDFORWARD
	297	iptables -A FORWARD -j REDFORWARD
	298	iptables -t nat -N REDNAT
	299	iptables -t nat -A POSTROUTING -j REDNAT
	300
ab4876ad MT	301	# Apply OpenVPN firewall rules
ab4876ad MT	302	/usr/local/bin/openvpnctrl --firewall-rules
ff4770c7 AM	303
	304	# run wirelessctrl
	305	/usr/local/bin/wirelessctrl
	306
c581b670 MT	307	# POLICY CHAIN
	308	iptables -N POLICYIN
	309	iptables -A INPUT -j POLICYIN
	310	iptables -N POLICYFWD
	311	iptables -A FORWARD -j POLICYFWD
	312	iptables -N POLICYOUT
	313	iptables -A OUTPUT -j POLICYOUT
b324de14	314
bb383423	315	# Initialize firewall policies.
5d7faa45	316	/usr/sbin/firewall-policy
690b0bd7	317
bb383423	318	# Install firewall rules for the red interface.
4b12aa41 TE	319	iptables_red_up
	320
	321	# If red has not been brought up yet, we will
	322	# add the blocking rules for MASQUERADE
	323	if [ ! -e "/var/ipfire/red/active" ]; then
	324	iptables_red_down
	325	fi
ff4770c7	326	}
3a1019f6	327
4b12aa41	328	iptables_red_up() {
c581b670 MT	329	iptables -F REDINPUT
	330	iptables -F REDFORWARD
	331	iptables -t nat -F REDNAT
3a1019f6	332
ff4770c7 AM	333	# PPPoE / PPTP Device
	334	if [ "$IFACE" != "" ]; then
	335	# PPPoE / PPTP
	336	if [ "$DEVICE" != "" ]; then
c581b670	337	iptables -A REDINPUT -i $DEVICE -j ACCEPT
ff4770c7 AM	338	fi
	339	if [ "$RED_TYPE" == "PPTP" -o "$RED_TYPE" == "PPPOE" ]; then
	340	if [ "$RED_DEV" != "" ]; then
c581b670	341	iptables -A REDINPUT -i $RED_DEV -j ACCEPT
ff4770c7 AM	342	fi
ff4770c7 AM	343	fi
3a1019f6	344	fi
ff4770c7 AM	345
	346	# PPTP over DHCP
	347	if [ "$DEVICE" != "" -a "$TYPE" == "PPTP" -a "$METHOD" == "DHCP" ]; then
c581b670 MT	348	iptables -A REDINPUT -p tcp --source-port 67 --destination-port 68 -i $DEVICE -j ACCEPT
c581b670 MT	349	iptables -A REDINPUT -p udp --source-port 67 --destination-port 68 -i $DEVICE -j ACCEPT
3a1019f6 MT	350	fi
3a1019f6 MT	351
ff4770c7 AM	352	# Orange pinholes
	353	if [ "$ORANGE_DEV" != "" ]; then
	354	# This rule enables a host on ORANGE network to connect to the outside
	355	# (only if we have a red connection)
	356	if [ "$IFACE" != "" ]; then
c581b670	357	iptables -A REDFORWARD -i $ORANGE_DEV -o $IFACE -j ACCEPT
ff4770c7	358	fi
3a1019f6	359	fi
c400fe4c	360
ff4770c7 AM	361	if [ "$IFACE" != "" -a -f /var/ipfire/red/active ]; then
	362	# DHCP
	363	if [ "$RED_DEV" != "" -a "$RED_TYPE" == "DHCP" ]; then
c581b670 MT	364	iptables -A REDINPUT -p tcp --source-port 67 --destination-port 68 -i $IFACE -j ACCEPT
c581b670 MT	365	iptables -A REDINPUT -p udp --source-port 67 --destination-port 68 -i $IFACE -j ACCEPT
ff4770c7 AM	366	fi
ff4770c7 AM	367	if [ "$METHOD" == "DHCP" -a "$PROTOCOL" == "RFC1483" ]; then
c581b670 MT	368	iptables -A REDINPUT -p tcp --source-port 67 --destination-port 68 -i $IFACE -j ACCEPT
c581b670 MT	369	iptables -A REDINPUT -p udp --source-port 67 --destination-port 68 -i $IFACE -j ACCEPT
ff4770c7 AM	370	fi
	371
	372	# Outgoing masquerading (don't masqerade IPSEC (mark 50))
c581b670	373	iptables -t nat -A REDNAT -m mark --mark 50 -o $IFACE -j RETURN
c926c637	374
83ef9c40 MT	375	if [ "$IFACE" = "$GREEN_DEV" ]; then
83ef9c40 MT	376	MASQUERADE_GREEN="off"
c926c637	377	fi
c400fe4c	378
983d471f	379	local NO_MASQ_NETWORKS
83ef9c40 MT	380
83ef9c40 MT	381	if [ "${MASQUERADE_GREEN}" = "off" ]; then
983d471f	382	NO_MASQ_NETWORKS="${NO_MASQ_NETWORKS} ${GREEN_NETADDRESS}/${GREEN_NETMASK}"
83ef9c40 MT	383	fi
	384
	385	if [ "${MASQUERADE_BLUE}" = "off" ]; then
983d471f	386	NO_MASQ_NETWORKS="${NO_MASQ_NETWORKS} ${BLUE_NETADDRESS}/${BLUE_NETMASK}"
83ef9c40 MT	387	fi
	388
	389	if [ "${MASQUERADE_ORANGE}" = "off" ]; then
983d471f	390	NO_MASQ_NETWORKS="${NO_MASQ_NETWORKS} ${ORANGE_NETADDRESS}/${ORANGE_NETMASK}"
83ef9c40 MT	391	fi
83ef9c40 MT	392
983d471f MT	393	local network
	394	for network in ${NO_MASQ_NETWORKS}; do
	395	iptables -t nat -A REDNAT -s "${network}" -o "${IFACE}" -j RETURN
83ef9c40 MT	396	done
	397
	398	# Masquerade everything else
	399	iptables -t nat -A REDNAT -o $IFACE -j MASQUERADE
6be0579b	400	fi
66f6b279 MT	401
66f6b279 MT	402	# Reload all rules.
55a5bcae	403	/usr/local/bin/firewallctrl
ff4770c7 AM	404	}
ff4770c7 AM	405
4b12aa41 TE	406	iptables_red_down() {
	407	# Prohibit packets to reach the masquerading rule
	408	# while the wan interface is down - this is required to
	409	# circumvent udp related NAT issues
	410	# http://forum.ipfire.org/index.php?topic=11127.0
e7204c2d MT	411	if [ -n "${IFACE}" ]; then
	412	iptables -F REDFORWARD
	413	iptables -A REDFORWARD -o "${IFACE}" -j DROP
	414	fi
4b12aa41 TE	415
	416	# Reload all rules.
	417	/usr/local/bin/firewallctrl
	418	}
	419
ff4770c7 AM	420	# See how we were called.
	421	case "$1" in
	422	start)
cdb725da MT	423	boot_mesg "Loading firewall modules into the kernel"
	424	modprobe iptable_nat \|\| failed=1
	425	for i in $(find /lib/modules/$(uname -r) -name nf_conntrack*); do
	426	modprobe $(basename $i \| cut -d. -f1) \|\| failed=1
	427	done
	428	for i in $(find /lib/modules/$(uname -r) -name nf_nat*); do
	429	modprobe $(basename $i \| cut -d. -f1) \|\| failed=1
	430	done
	431	(exit ${failed})
	432	evaluate_retval
	433
7d7740a4	434	boot_mesg "Setting up firewall"
ff4770c7	435	iptables_init
7d7740a4	436	evaluate_retval
6be0579b	437	;;
4b12aa41	438	reload\|up)
7d7740a4	439	boot_mesg "Reloading firewall"
4b12aa41	440	iptables_red_up
7d7740a4	441	evaluate_retval
3a1019f6	442	;;
4b12aa41 TE	443	down)
	444	boot_mesg "Disabling firewall access to RED"
	445	iptables_red_down
	446	evaluate_retval
	447	;;
3a1019f6	448	restart)
3a1019f6 MT	449	$0 start
	450	;;
	451	*)
ff4770c7	452	echo "Usage: $0 {start\|reload\|restart}"
3a1019f6 MT	453	exit 1
	454	;;
	455	esac
	456
	457	exit 0