[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

	# 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 -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 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 "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 MT	107
b1109b8a MT	108	# FTP
d57c6162 MT	109	if [ "${CONNTRACK_FTP}" = "on" ]; then
	110	iptables -A CONNTRACK -m conntrack --ctstate RELATED \
	111	-m helper --helper ftp -p tcp --dport 1024: -j ACCEPT
	112	iptables -t raw -A CONNTRACK -p tcp --dport 21 -j CT --helper ftp
	113	fi
b1109b8a MT	114
b1109b8a MT	115	# PPTP
d57c6162 MT	116	if [ "${CONNTRACK_PPTP}" = "on" ]; then
	117	iptables -A CONNTRACK -m conntrack --ctstate RELATED \
	118	-m helper --helper pptp -j ACCEPT
	119	iptables -t raw -A CONNTRACK -p udp --dport 1723 -j CT --helper pptp
	120	fi
b1109b8a MT	121
b1109b8a MT	122	# TFTP
d57c6162 MT	123	if [ "${CONNTRACK_TFTP}" = "on" ]; then
	124	iptables -A CONNTRACK -m conntrack --ctstate RELATED \
	125	-m helper --helper tftp -j ACCEPT
	126	iptables -t raw -A CONNTRACK -p udp --dport 69 -j CT --helper tftp
	127	fi
3a1019f6	128
50354ffe MT	129	# IRC
	130	if [ "${CONNTRACK_IRC}" = "on" ]; then
	131	iptables -A CONNTRACK -m conntrack --ctstate RELATED \
	132	-m helper --helper irc -j ACCEPT
	133	iptables -t raw -A CONNTRACK -p tcp --dport 6667 -j CT --helper irc
	134	fi
	135
a93bf696 MT	136	# Amanda
	137	if [ "${CONNTRACK_AMANDA}" = "on" ]; then
	138	iptables -A CONNTRACK -m conntrack --ctstate RELATED \
	139	-m helper --helper amanda -j ACCEPT
	140	iptables -t raw -A CONNTRACK -j CT --helper amanda
	141	fi
	142
3a1019f6	143	# Fix for braindead ISP's
c581b670	144	iptables -A FORWARD -p tcp --tcp-flags SYN,RST SYN -j TCPMSS --clamp-mss-to-pmtu
3a1019f6 MT	145
3a1019f6 MT	146	# CUSTOM chains, can be used by the users themselves
c581b670 MT	147	iptables -N CUSTOMINPUT
	148	iptables -A INPUT -j CUSTOMINPUT
	149	iptables -N CUSTOMFORWARD
	150	iptables -A FORWARD -j CUSTOMFORWARD
	151	iptables -N CUSTOMOUTPUT
	152	iptables -A OUTPUT -j CUSTOMOUTPUT
	153	iptables -t nat -N CUSTOMPREROUTING
	154	iptables -t nat -A PREROUTING -j CUSTOMPREROUTING
	155	iptables -t nat -N CUSTOMPOSTROUTING
	156	iptables -t nat -A POSTROUTING -j CUSTOMPOSTROUTING
3a1019f6	157
2a5b19c5 AF	158	# P2PBLOCK
	159	iptables -N P2PBLOCK
	160	iptables -A INPUT -j P2PBLOCK
	161	iptables -A FORWARD -j P2PBLOCK
	162	iptables -A OUTPUT -j P2PBLOCK
	163
815eaff4	164	# Guardian (IPS) chains
c581b670 MT	165	iptables -N GUARDIAN
	166	iptables -A INPUT -j GUARDIAN
	167	iptables -A FORWARD -j GUARDIAN
815eaff4	168
1e555330	169	# Block OpenVPN transfer networks
c581b670	170	iptables -N OVPNBLOCK
a0a5c14f	171	iptables -A INPUT -i tun+ -j OVPNBLOCK
a0a5c14f MT	172	iptables -A FORWARD -i tun+ -j OVPNBLOCK
a0a5c14f MT	173	iptables -A FORWARD -o tun+ -j OVPNBLOCK
1e555330	174
51ab1de1	175	# OpenVPN transfer network translation
c581b670 MT	176	iptables -t nat -N OVPNNAT
c581b670 MT	177	iptables -t nat -A POSTROUTING -j OVPNNAT
51ab1de1	178
daa1ceba	179	# IPTV chains for IGMPPROXY
c581b670 MT	180	iptables -N IPTVINPUT
	181	iptables -A INPUT -j IPTVINPUT
	182	iptables -N IPTVFORWARD
	183	iptables -A FORWARD -j IPTVFORWARD
daa1ceba	184
8e59a602 MT	185	# Allow to ping the firewall.
	186	iptables -N ICMPINPUT
	187	iptables -A INPUT -j ICMPINPUT
	188	iptables -A ICMPINPUT -p icmp --icmp-type 8 -j ACCEPT
3a1019f6	189
afc611d4	190	# Accept everything on loopback
c581b670 MT	191	iptables -N LOOPBACK
	192	iptables -A LOOPBACK -i lo -j ACCEPT
	193	iptables -A LOOPBACK -o lo -j ACCEPT
afc611d4	194
3b9a23ce	195	# Filter all packets with loopback addresses on non-loopback interfaces.
c581b670 MT	196	iptables -A LOOPBACK -s 127.0.0.0/8 -j DROP
c581b670 MT	197	iptables -A LOOPBACK -d 127.0.0.0/8 -j DROP
3b9a23ce MT	198
3b9a23ce MT	199	for i in INPUT FORWARD OUTPUT; do
c581b670	200	iptables -A ${i} -j LOOPBACK
3b9a23ce	201	done
afc611d4	202
3a1019f6	203	# Accept everything connected
b85d2a98	204	for i in INPUT FORWARD OUTPUT; do
c581b670	205	iptables -A ${i} -j CONNTRACK
b85d2a98 MT	206	done
b85d2a98 MT	207
8490e496 MT	208	# Allow DHCP
	209	iptables -N DHCPINPUT
	210	iptables -A DHCPINPUT -p udp --sport 68 --dport 67 -j ACCEPT
	211	iptables -A DHCPINPUT -p tcp --sport 68 --dport 67 -j ACCEPT
	212
	213	iptables -N DHCPOUTPUT
	214	iptables -A DHCPOUTPUT -p udp --sport 67 --dport 68 -j ACCEPT
	215	iptables -A DHCPOUTPUT -p tcp --sport 67 --dport 68 -j ACCEPT
	216
	217	# Allow DHCP on GREEN
	218	iptables -N DHCPGREENINPUT
	219	iptables -N DHCPGREENOUTPUT
	220	if [ -n "${GREEN_DEV}" ]; then
	221	iptables -A INPUT -i "${GREEN_DEV}" -j DHCPGREENINPUT
	222	iptables -A OUTPUT -o "${GREEN_DEV}" -j DHCPGREENOUTPUT
	223	fi
	224
	225	# allow DHCP on BLUE to be turned on/off
	226	iptables -N DHCPBLUEINPUT
	227	iptables -N DHCPBLUEOUTPUT
	228	if [ -n "${BLUE_DEV}" ]; then
	229	iptables -A INPUT -i "${BLUE_DEV}" -j DHCPBLUEINPUT
	230	iptables -A OUTPUT -o "${BLUE_DEV}" -j DHCPBLUEOUTPUT
	231	fi
	232
cab02e2a SS	233	# GeoIP block
	234	iptables -N GEOIPBLOCK
	235	iptables -A INPUT -j GEOIPBLOCK
	236	iptables -A FORWARD -j GEOIPBLOCK
	237
5fd30232	238	# trafic from ipsecX/TUN/TAP interfaces, before "-i GREEN_DEV" accept everything
c581b670 MT	239	iptables -N IPSECINPUT
	240	iptables -N IPSECFORWARD
	241	iptables -N IPSECOUTPUT
	242	iptables -A INPUT -j IPSECINPUT
	243	iptables -A FORWARD -j IPSECFORWARD
	244	iptables -A OUTPUT -j IPSECOUTPUT
	245	iptables -t nat -N IPSECNAT
	246	iptables -t nat -A POSTROUTING -j IPSECNAT
b68e5c14	247
3a1019f6	248	# localhost and ethernet.
c0e0848f MT	249	# Always allow accessing the web GUI from GREEN.
	250	iptables -N GUIINPUT
	251	iptables -A INPUT -j GUIINPUT
	252	iptables -A GUIINPUT -i "${GREEN_DEV}" -p tcp --dport 444 -j ACCEPT
8490e496	253
81393987	254	# WIRELESS chains
c581b670 MT	255	iptables -N WIRELESSINPUT
	256	iptables -A INPUT -m conntrack --ctstate NEW -j WIRELESSINPUT
	257	iptables -N WIRELESSFORWARD
	258	iptables -A FORWARD -m conntrack --ctstate NEW -j WIRELESSFORWARD
987b75bc	259
ab4876ad	260	# OpenVPN
c581b670 MT	261	iptables -N OVPNINPUT
c581b670 MT	262	iptables -A INPUT -j OVPNINPUT
ab4876ad	263
987b75bc	264	# TOR
c581b670 MT	265	iptables -N TOR_INPUT
c581b670 MT	266	iptables -A INPUT -j TOR_INPUT
12dcfbbd	267
d5f1422d	268	# Jump into the actual firewall ruleset.
c581b670 MT	269	iptables -N INPUTFW
c581b670 MT	270	iptables -A INPUT -j INPUTFW
d5f1422d	271
c581b670 MT	272	iptables -N OUTGOINGFW
c581b670 MT	273	iptables -A OUTPUT -j OUTGOINGFW
d5f1422d	274
c581b670 MT	275	iptables -N FORWARDFW
c581b670 MT	276	iptables -A FORWARD -j FORWARDFW
d5f1422d	277
fac38614	278	# SNAT rules
c581b670 MT	279	iptables -t nat -N NAT_SOURCE
c581b670 MT	280	iptables -t nat -A POSTROUTING -j NAT_SOURCE
fac38614	281
bb12dd7b	282	# Custom prerouting chains (for transparent proxy)
c581b670 MT	283	iptables -t nat -N SQUID
c581b670 MT	284	iptables -t nat -A PREROUTING -j SQUID
bb12dd7b MT	285
bb12dd7b MT	286	# DNAT rules
c581b670 MT	287	iptables -t nat -N NAT_DESTINATION
c581b670 MT	288	iptables -t nat -A PREROUTING -j NAT_DESTINATION
99f11a16	289	iptables -t nat -A OUTPUT -j NAT_DESTINATION
bb12dd7b	290
6e87f0aa MT	291	iptables -t mangle -N NAT_DESTINATION
	292	iptables -t mangle -A PREROUTING -j NAT_DESTINATION
	293
	294	iptables -t nat -N NAT_DESTINATION_FIX
	295	iptables -t nat -A POSTROUTING -j NAT_DESTINATION_FIX
	296
	297	iptables -t nat -A NAT_DESTINATION_FIX \
	298	-m mark --mark 1 -j SNAT --to-source "${GREEN_ADDRESS}"
	299
	300	if [ -n "${BLUE_ADDRESS}" ]; then
	301	iptables -t nat -A NAT_DESTINATION_FIX \
	302	-m mark --mark 2 -j SNAT --to-source "${BLUE_ADDRESS}"
	303	fi
	304
	305	if [ -n "${ORANGE_ADDRESS}" ]; then
	306	iptables -t nat -A NAT_DESTINATION_FIX \
	307	-m mark --mark 3 -j SNAT --to-source "${ORANGE_ADDRESS}"
	308	fi
	309
7e7495b3	310	# upnp chain for our upnp daemon
c581b670 MT	311	iptables -t nat -N UPNPFW
	312	iptables -t nat -A PREROUTING -j UPNPFW
	313	iptables -N UPNPFW
	314	iptables -A FORWARD -m conntrack --ctstate NEW -j UPNPFW
3a1019f6	315
6e87f0aa MT	316	# RED chain, used for the red interface
	317	iptables -N REDINPUT
	318	iptables -A INPUT -j REDINPUT
	319	iptables -N REDFORWARD
	320	iptables -A FORWARD -j REDFORWARD
	321	iptables -t nat -N REDNAT
	322	iptables -t nat -A POSTROUTING -j REDNAT
	323
ab4876ad MT	324	# Apply OpenVPN firewall rules
ab4876ad MT	325	/usr/local/bin/openvpnctrl --firewall-rules
ff4770c7 AM	326
	327	# run wirelessctrl
	328	/usr/local/bin/wirelessctrl
	329
c581b670 MT	330	# POLICY CHAIN
	331	iptables -N POLICYIN
	332	iptables -A INPUT -j POLICYIN
	333	iptables -N POLICYFWD
	334	iptables -A FORWARD -j POLICYFWD
	335	iptables -N POLICYOUT
	336	iptables -A OUTPUT -j POLICYOUT
b324de14	337
bb383423	338	# Initialize firewall policies.
5d7faa45	339	/usr/sbin/firewall-policy
690b0bd7	340
bb383423	341	# Install firewall rules for the red interface.
4b12aa41 TE	342	iptables_red_up
	343
	344	# If red has not been brought up yet, we will
	345	# add the blocking rules for MASQUERADE
	346	if [ ! -e "/var/ipfire/red/active" ]; then
	347	iptables_red_down
	348	fi
ff4770c7	349	}
3a1019f6	350
4b12aa41	351	iptables_red_up() {
c581b670 MT	352	iptables -F REDINPUT
	353	iptables -F REDFORWARD
	354	iptables -t nat -F REDNAT
3a1019f6	355
ff4770c7 AM	356	# PPPoE / PPTP Device
	357	if [ "$IFACE" != "" ]; then
	358	# PPPoE / PPTP
	359	if [ "$DEVICE" != "" ]; then
c581b670	360	iptables -A REDINPUT -i $DEVICE -j ACCEPT
ff4770c7 AM	361	fi
	362	if [ "$RED_TYPE" == "PPTP" -o "$RED_TYPE" == "PPPOE" ]; then
	363	if [ "$RED_DEV" != "" ]; then
c581b670	364	iptables -A REDINPUT -i $RED_DEV -j ACCEPT
ff4770c7 AM	365	fi
ff4770c7 AM	366	fi
3a1019f6	367	fi
ff4770c7 AM	368
	369	# PPTP over DHCP
	370	if [ "$DEVICE" != "" -a "$TYPE" == "PPTP" -a "$METHOD" == "DHCP" ]; then
c581b670 MT	371	iptables -A REDINPUT -p tcp --source-port 67 --destination-port 68 -i $DEVICE -j ACCEPT
c581b670 MT	372	iptables -A REDINPUT -p udp --source-port 67 --destination-port 68 -i $DEVICE -j ACCEPT
3a1019f6 MT	373	fi
3a1019f6 MT	374
ff4770c7 AM	375	# Orange pinholes
	376	if [ "$ORANGE_DEV" != "" ]; then
	377	# This rule enables a host on ORANGE network to connect to the outside
	378	# (only if we have a red connection)
	379	if [ "$IFACE" != "" ]; then
c581b670	380	iptables -A REDFORWARD -i $ORANGE_DEV -o $IFACE -j ACCEPT
ff4770c7	381	fi
3a1019f6	382	fi
c400fe4c	383
ff4770c7 AM	384	if [ "$IFACE" != "" -a -f /var/ipfire/red/active ]; then
	385	# DHCP
	386	if [ "$RED_DEV" != "" -a "$RED_TYPE" == "DHCP" ]; then
c581b670 MT	387	iptables -A REDINPUT -p tcp --source-port 67 --destination-port 68 -i $IFACE -j ACCEPT
c581b670 MT	388	iptables -A REDINPUT -p udp --source-port 67 --destination-port 68 -i $IFACE -j ACCEPT
ff4770c7 AM	389	fi
ff4770c7 AM	390	if [ "$METHOD" == "DHCP" -a "$PROTOCOL" == "RFC1483" ]; then
c581b670 MT	391	iptables -A REDINPUT -p tcp --source-port 67 --destination-port 68 -i $IFACE -j ACCEPT
c581b670 MT	392	iptables -A REDINPUT -p udp --source-port 67 --destination-port 68 -i $IFACE -j ACCEPT
ff4770c7 AM	393	fi
	394
	395	# Outgoing masquerading (don't masqerade IPSEC (mark 50))
c581b670	396	iptables -t nat -A REDNAT -m mark --mark 50 -o $IFACE -j RETURN
c926c637	397
83ef9c40 MT	398	if [ "$IFACE" = "$GREEN_DEV" ]; then
83ef9c40 MT	399	MASQUERADE_GREEN="off"
c926c637	400	fi
c400fe4c	401
983d471f	402	local NO_MASQ_NETWORKS
83ef9c40 MT	403
83ef9c40 MT	404	if [ "${MASQUERADE_GREEN}" = "off" ]; then
983d471f	405	NO_MASQ_NETWORKS="${NO_MASQ_NETWORKS} ${GREEN_NETADDRESS}/${GREEN_NETMASK}"
83ef9c40 MT	406	fi
	407
	408	if [ "${MASQUERADE_BLUE}" = "off" ]; then
983d471f	409	NO_MASQ_NETWORKS="${NO_MASQ_NETWORKS} ${BLUE_NETADDRESS}/${BLUE_NETMASK}"
83ef9c40 MT	410	fi
	411
	412	if [ "${MASQUERADE_ORANGE}" = "off" ]; then
983d471f	413	NO_MASQ_NETWORKS="${NO_MASQ_NETWORKS} ${ORANGE_NETADDRESS}/${ORANGE_NETMASK}"
83ef9c40 MT	414	fi
83ef9c40 MT	415
983d471f MT	416	local network
	417	for network in ${NO_MASQ_NETWORKS}; do
	418	iptables -t nat -A REDNAT -s "${network}" -o "${IFACE}" -j RETURN
83ef9c40 MT	419	done
	420
	421	# Masquerade everything else
	422	iptables -t nat -A REDNAT -o $IFACE -j MASQUERADE
6be0579b	423	fi
66f6b279 MT	424
66f6b279 MT	425	# Reload all rules.
55a5bcae	426	/usr/local/bin/firewallctrl
ff4770c7 AM	427	}
ff4770c7 AM	428
4b12aa41 TE	429	iptables_red_down() {
	430	# Prohibit packets to reach the masquerading rule
	431	# while the wan interface is down - this is required to
	432	# circumvent udp related NAT issues
	433	# http://forum.ipfire.org/index.php?topic=11127.0
e7204c2d MT	434	if [ -n "${IFACE}" ]; then
	435	iptables -F REDFORWARD
	436	iptables -A REDFORWARD -o "${IFACE}" -j DROP
	437	fi
4b12aa41 TE	438
	439	# Reload all rules.
	440	/usr/local/bin/firewallctrl
	441	}
	442
ff4770c7 AM	443	# See how we were called.
	444	case "$1" in
	445	start)
7d7740a4	446	boot_mesg "Setting up firewall"
ff4770c7	447	iptables_init
7d7740a4	448	evaluate_retval
6be0579b	449	;;
4b12aa41	450	reload\|up)
7d7740a4	451	boot_mesg "Reloading firewall"
4b12aa41	452	iptables_red_up
7d7740a4	453	evaluate_retval
3a1019f6	454	;;
4b12aa41 TE	455	down)
	456	boot_mesg "Disabling firewall access to RED"
	457	iptables_red_down
	458	evaluate_retval
	459	;;
3a1019f6	460	restart)
3a1019f6 MT	461	$0 start
	462	;;
	463	*)
ff4770c7	464	echo "Usage: $0 {start\|reload\|restart}"
3a1019f6 MT	465	exit 1
	466	;;
	467	esac
	468
	469	exit 0