[people/mfischer/ipfire-2.x.git] / src / initscripts / system / 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

NAT_MASK="0x0f000000"

IPSEC_MARK="0x00800000"
IPSEC_MASK="${IPSEC_MARK}"

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

	# Enable TRACE logging to syslog
	modprobe nf_log_ipv4
	sysctl -q -w net.netfilter.nf_log.2=nf_log_ipv4

	# Empty LOG_DROP and LOG_REJECT chains
	iptables -N LOG_DROP
	iptables -A LOG_DROP   -m limit --limit 10/second -j LOG
	iptables -A LOG_DROP   -j DROP
	iptables -N LOG_REJECT
	iptables -A LOG_REJECT -m limit --limit 10/second -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/second -j LOG --log-prefix "DROP_TCP Scan "  -m comment --comment "DROP_TCP PScan"
		iptables -A PSCAN -p udp  -m limit --limit 10/second -j LOG --log-prefix "DROP_UDP Scan "  -m comment --comment "DROP_UDP PScan"
		iptables -A PSCAN -p icmp -m limit --limit 10/second -j LOG --log-prefix "DROP_ICMP Scan " -m comment --comment "DROP_ICMP PScan"
		iptables -A PSCAN -f      -m limit --limit 10/second -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/second -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

	# Restore any connection marks
	iptables -t mangle -A PREROUTING -j CONNMARK --restore-mark

	# Fix for braindead ISPs
	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
	
	# IPS (Guardian) 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

	# IPS (Suricata) chains
	iptables -N IPS_INPUT
	iptables -N IPS_FORWARD
	iptables -N IPS_OUTPUT
	iptables -A INPUT -j IPS_INPUT
	iptables -A FORWARD -j IPS_FORWARD
	iptables -A OUTPUT -j IPS_OUTPUT

	# 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

	# Captive portal
	iptables -N CAPTIVE_PORTAL
	iptables -N CAPTIVE_PORTAL_CLIENTS
	for i in INPUT FORWARD; do
		iptables -A ${i} -j CAPTIVE_PORTAL
	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

	# Location Block
	iptables -N LOCATIONBLOCK
	iptables -A INPUT -j LOCATIONBLOCK
	iptables -A FORWARD -j LOCATIONBLOCK

	# 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
	if [ -n "${GREEN_DEV}" ]; then
		iptables -A GUIINPUT -i "${GREEN_DEV}" -p tcp --dport 444 -j ACCEPT
	fi

	# 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 (inbound and outbound)
	iptables -N TOR_INPUT
	iptables -A INPUT -j TOR_INPUT
	iptables -N TOR_OUTPUT
	iptables -A OUTPUT -j TOR_OUTPUT
	
	# 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

	# Captive Portal
	iptables -t nat -N CAPTIVE_PORTAL
	iptables -t nat -A PREROUTING -j CAPTIVE_PORTAL

	# 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

	if [ -n "${GREEN_ADDRESS}" ]; then
		iptables -t nat -A NAT_DESTINATION_FIX \
			-m mark --mark "0x01000000/${NAT_MASK}" -j SNAT --to-source "${GREEN_ADDRESS}"
	fi

	if [ -n "${BLUE_ADDRESS}" ]; then
		iptables -t nat -A NAT_DESTINATION_FIX \
			-m mark --mark "0x02000000/${NAT_MASK}" -j SNAT --to-source "${BLUE_ADDRESS}"
	fi

	if [ -n "${ORANGE_ADDRESS}" ]; then
		iptables -t nat -A NAT_DESTINATION_FIX \
			-m mark --mark "0x04000000/${NAT_MASK}" -j SNAT --to-source "${ORANGE_ADDRESS}"
	fi

	# 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 chains
	/usr/lib/firewall/ipsec-policy

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

	# run wirelessctrl
	/usr/local/bin/wirelessctrl

	# run captivectrl
	/usr/local/bin/captivectrl

	# 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

	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)
		iptables -t nat -A REDNAT -m mark --mark "${IPSEC_MARK}/${IPSEC_MASK}" -o "${IFACE}" -j RETURN

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

		local NO_MASQ_NETWORKS

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

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

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

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

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

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

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

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

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

exit 0
Commit	Line	Data
3a1019f6 MT	1	#!/bin/sh
3a1019f6 MT	2
0f5c5ce7 MT	3	. /etc/sysconfig/rc
	4	. ${rc_functions}
	5
3a1019f6 MT	6	eval $(/usr/local/bin/readhash /var/ipfire/ppp/settings)
3a1019f6 MT	7	eval $(/usr/local/bin/readhash /var/ipfire/ethernet/settings)
fe0cd647	8	eval $(/usr/local/bin/readhash /var/ipfire/optionsfw/settings)
3a1019f6 MT	9	IFACE=`/bin/cat /var/ipfire/red/iface 2> /dev/null \| /usr/bin/tr -d '\012'`
	10
	11	if [ -f /var/ipfire/red/device ]; then
	12	DEVICE=`/bin/cat /var/ipfire/red/device 2> /dev/null \| /usr/bin/tr -d '\012'`
	13	fi
	14
ce31144c MT	15	NAT_MASK="0x0f000000"
ce31144c MT	16
51c4b73f MT	17	IPSEC_MARK="0x00800000"
	18	IPSEC_MASK="${IPSEC_MARK}"
	19
c581b670 MT	20	function iptables() {
	21	/sbin/iptables --wait "$@"
	22	}
	23
3a1019f6 MT	24	iptables_init() {
3a1019f6 MT	25	# Flush all rules and delete all custom chains
c581b670 MT	26	iptables -F
	27	iptables -t nat -F
	28	iptables -t mangle -F
b1109b8a	29	iptables -t raw -F
c581b670 MT	30	iptables -X
	31	iptables -t nat -X
	32	iptables -t mangle -X
b1109b8a	33	iptables -t raw -X
3a1019f6 MT	34
3a1019f6 MT	35	# Set up policies
c581b670 MT	36	iptables -P INPUT DROP
	37	iptables -P FORWARD DROP
	38	iptables -P OUTPUT ACCEPT
3a1019f6	39
78b65ea7 MT	40	# Enable TRACE logging to syslog
	41	modprobe nf_log_ipv4
	42	sysctl -q -w net.netfilter.nf_log.2=nf_log_ipv4
	43
3a1019f6	44	# Empty LOG_DROP and LOG_REJECT chains
c581b670	45	iptables -N LOG_DROP
8ee3a135	46	iptables -A LOG_DROP -m limit --limit 10/second -j LOG
c581b670 MT	47	iptables -A LOG_DROP -j DROP
c581b670 MT	48	iptables -N LOG_REJECT
8ee3a135	49	iptables -A LOG_REJECT -m limit --limit 10/second -j LOG
c581b670	50	iptables -A LOG_REJECT -j REJECT
3a1019f6 MT	51
3a1019f6 MT	52	# This chain will log, then DROPs packets with certain bad combinations
ef7e9e52	53	# of flags might indicate a port-scan attempt (xmas, null, etc.)
c581b670	54	iptables -N PSCAN
5595bc03	55	if [ "$DROPPORTSCAN" == "on" ]; then
ef7e9e52 PM	56	iptables -A PSCAN -p tcp -m limit --limit 10/second -j LOG --log-prefix "DROP_TCP Scan " -m comment --comment "DROP_TCP PScan"
ef7e9e52 PM	57	iptables -A PSCAN -p udp -m limit --limit 10/second -j LOG --log-prefix "DROP_UDP Scan " -m comment --comment "DROP_UDP PScan"
8ee3a135 PM	58	iptables -A PSCAN -p icmp -m limit --limit 10/second -j LOG --log-prefix "DROP_ICMP Scan " -m comment --comment "DROP_ICMP PScan"
8ee3a135 PM	59	iptables -A PSCAN -f -m limit --limit 10/second -j LOG --log-prefix "DROP_FRAG Scan " -m comment --comment "DROP_FRAG PScan"
5595bc03	60	fi
c581b670	61	iptables -A PSCAN -j DROP -m comment --comment "DROP_PScan"
3a1019f6 MT	62
3a1019f6 MT	63	# New tcp packets without SYN set - could well be an obscure type of port scan
ef7e9e52	64	# that's not covered above, may just be a broken Windows machine
c581b670	65	iptables -N NEWNOTSYN
5595bc03	66	if [ "$DROPNEWNOTSYN" == "on" ]; then
8ee3a135	67	iptables -A NEWNOTSYN -m limit --limit 10/second -j LOG --log-prefix "DROP_NEWNOTSYN "
5595bc03	68	fi
c581b670	69	iptables -A NEWNOTSYN -j DROP -m comment --comment "DROP_NEWNOTSYN"
3a1019f6 MT	70
3a1019f6 MT	71	# Chain to contain all the rules relating to bad TCP flags
c581b670	72	iptables -N BADTCP
3a1019f6	73
c581b670 MT	74	# Don't check loopback
c581b670 MT	75	iptables -A BADTCP -i lo -j RETURN
d8158ca6	76
3a1019f6	77	# Disallow packets frequently used by port-scanners
dccbf1bf AF	78	# NMAP FIN/URG/PSH (XMAS scan)
	79	iptables -A BADTCP -p tcp --tcp-flags ALL FIN,URG,PSH -j PSCAN
	80	# SYN/RST/ACK/FIN/URG
	81	iptables -A BADTCP -p tcp --tcp-flags ALL SYN,RST,ACK,FIN,URG -j PSCAN
	82	# ALL/ALL
	83	iptables -A BADTCP -p tcp --tcp-flags ALL ALL -j PSCAN
	84	# FIN Stealth
c581b670	85	iptables -A BADTCP -p tcp --tcp-flags ALL FIN -j PSCAN
3a1019f6	86	# SYN/RST (also catches xmas variants that set SYN+RST+...)
c581b670	87	iptables -A BADTCP -p tcp --tcp-flags SYN,RST SYN,RST -j PSCAN
3a1019f6	88	# SYN/FIN (QueSO or nmap OS probe)
c581b670	89	iptables -A BADTCP -p tcp --tcp-flags SYN,FIN SYN,FIN -j PSCAN
dccbf1bf AF	90	# Null
dccbf1bf AF	91	iptables -A BADTCP -p tcp --tcp-flags ALL NONE -j PSCAN
3a1019f6	92	# NEW TCP without SYN
c581b670	93	iptables -A BADTCP -p tcp ! --syn -m conntrack --ctstate NEW -j NEWNOTSYN
b85d2a98	94
c581b670 MT	95	iptables -A INPUT -p tcp -j BADTCP
c581b670 MT	96	iptables -A FORWARD -p tcp -j BADTCP
c0359d6d	97
b1109b8a	98	# Connection tracking chains
c581b670	99	iptables -N CONNTRACK
b1109b8a	100	iptables -A CONNTRACK -m conntrack --ctstate ESTABLISHED -j ACCEPT
dccbf1bf	101	iptables -A CONNTRACK -m conntrack --ctstate INVALID -j DROP
0f535060	102	iptables -A CONNTRACK -p icmp -m conntrack --ctstate RELATED -j ACCEPT
b1109b8a MT	103	iptables -t raw -N CONNTRACK
	104	iptables -t raw -A PREROUTING -j CONNTRACK
	105
c825fcef MT	106	# Restore any connection marks
	107	iptables -t mangle -A PREROUTING -j CONNMARK --restore-mark
	108
ef7e9e52	109	# Fix for braindead ISPs
c581b670	110	iptables -A FORWARD -p tcp --tcp-flags SYN,RST SYN -j TCPMSS --clamp-mss-to-pmtu
3a1019f6 MT	111
3a1019f6 MT	112	# CUSTOM chains, can be used by the users themselves
c581b670 MT	113	iptables -N CUSTOMINPUT
	114	iptables -A INPUT -j CUSTOMINPUT
	115	iptables -N CUSTOMFORWARD
	116	iptables -A FORWARD -j CUSTOMFORWARD
	117	iptables -N CUSTOMOUTPUT
	118	iptables -A OUTPUT -j CUSTOMOUTPUT
	119	iptables -t nat -N CUSTOMPREROUTING
	120	iptables -t nat -A PREROUTING -j CUSTOMPREROUTING
	121	iptables -t nat -N CUSTOMPOSTROUTING
	122	iptables -t nat -A POSTROUTING -j CUSTOMPOSTROUTING
3a1019f6	123
2a5b19c5 AF	124	# P2PBLOCK
	125	iptables -N P2PBLOCK
	126	iptables -A INPUT -j P2PBLOCK
	127	iptables -A FORWARD -j P2PBLOCK
	128	iptables -A OUTPUT -j P2PBLOCK
	129
ef7e9e52	130	# IPS (Guardian) chains
c581b670 MT	131	iptables -N GUARDIAN
	132	iptables -A INPUT -j GUARDIAN
	133	iptables -A FORWARD -j GUARDIAN
815eaff4	134
80fbd899 MT	135	# Block non-established IPsec networks
	136	iptables -N IPSECBLOCK
	137	iptables -A FORWARD -m policy --dir out --pol none -j IPSECBLOCK
	138	iptables -A OUTPUT -m policy --dir out --pol none -j IPSECBLOCK
	139
1e555330	140	# Block OpenVPN transfer networks
c581b670	141	iptables -N OVPNBLOCK
a0a5c14f	142	iptables -A INPUT -i tun+ -j OVPNBLOCK
a0a5c14f MT	143	iptables -A FORWARD -i tun+ -j OVPNBLOCK
a0a5c14f MT	144	iptables -A FORWARD -o tun+ -j OVPNBLOCK
1e555330	145
ef7e9e52	146	# IPS (Suricata) chains
5dba8382 PM	147	iptables -N IPS_INPUT
	148	iptables -N IPS_FORWARD
	149	iptables -N IPS_OUTPUT
	150	iptables -A INPUT -j IPS_INPUT
	151	iptables -A FORWARD -j IPS_FORWARD
	152	iptables -A OUTPUT -j IPS_OUTPUT
	153
51ab1de1	154	# OpenVPN transfer network translation
c581b670 MT	155	iptables -t nat -N OVPNNAT
c581b670 MT	156	iptables -t nat -A POSTROUTING -j OVPNNAT
51ab1de1	157
daa1ceba	158	# IPTV chains for IGMPPROXY
c581b670 MT	159	iptables -N IPTVINPUT
	160	iptables -A INPUT -j IPTVINPUT
	161	iptables -N IPTVFORWARD
	162	iptables -A FORWARD -j IPTVFORWARD
daa1ceba	163
8e59a602 MT	164	# Allow to ping the firewall.
	165	iptables -N ICMPINPUT
	166	iptables -A INPUT -j ICMPINPUT
	167	iptables -A ICMPINPUT -p icmp --icmp-type 8 -j ACCEPT
3a1019f6	168
afc611d4	169	# Accept everything on loopback
c581b670 MT	170	iptables -N LOOPBACK
	171	iptables -A LOOPBACK -i lo -j ACCEPT
	172	iptables -A LOOPBACK -o lo -j ACCEPT
afc611d4	173
3b9a23ce	174	# Filter all packets with loopback addresses on non-loopback interfaces.
c581b670 MT	175	iptables -A LOOPBACK -s 127.0.0.0/8 -j DROP
c581b670 MT	176	iptables -A LOOPBACK -d 127.0.0.0/8 -j DROP
3b9a23ce MT	177
3b9a23ce MT	178	for i in INPUT FORWARD OUTPUT; do
c581b670	179	iptables -A ${i} -j LOOPBACK
3b9a23ce	180	done
afc611d4	181
bbaa3613 AM	182	# Captive portal
	183	iptables -N CAPTIVE_PORTAL
	184	iptables -N CAPTIVE_PORTAL_CLIENTS
	185	for i in INPUT FORWARD; do
	186	iptables -A ${i} -j CAPTIVE_PORTAL
	187	done
	188
3a1019f6	189	# Accept everything connected
b85d2a98	190	for i in INPUT FORWARD OUTPUT; do
c581b670	191	iptables -A ${i} -j CONNTRACK
b85d2a98 MT	192	done
b85d2a98 MT	193
8490e496 MT	194	# Allow DHCP
	195	iptables -N DHCPINPUT
	196	iptables -A DHCPINPUT -p udp --sport 68 --dport 67 -j ACCEPT
	197	iptables -A DHCPINPUT -p tcp --sport 68 --dport 67 -j ACCEPT
	198
	199	iptables -N DHCPOUTPUT
	200	iptables -A DHCPOUTPUT -p udp --sport 67 --dport 68 -j ACCEPT
	201	iptables -A DHCPOUTPUT -p tcp --sport 67 --dport 68 -j ACCEPT
	202
	203	# Allow DHCP on GREEN
	204	iptables -N DHCPGREENINPUT
	205	iptables -N DHCPGREENOUTPUT
	206	if [ -n "${GREEN_DEV}" ]; then
	207	iptables -A INPUT -i "${GREEN_DEV}" -j DHCPGREENINPUT
	208	iptables -A OUTPUT -o "${GREEN_DEV}" -j DHCPGREENOUTPUT
	209	fi
	210
ef7e9e52	211	# Allow DHCP on BLUE to be turned on/off
8490e496 MT	212	iptables -N DHCPBLUEINPUT
	213	iptables -N DHCPBLUEOUTPUT
	214	if [ -n "${BLUE_DEV}" ]; then
	215	iptables -A INPUT -i "${BLUE_DEV}" -j DHCPBLUEINPUT
	216	iptables -A OUTPUT -o "${BLUE_DEV}" -j DHCPBLUEOUTPUT
	217	fi
	218
0e6eca78 MT	219	# Location Block
	220	iptables -N LOCATIONBLOCK
	221	iptables -A INPUT -j LOCATIONBLOCK
	222	iptables -A FORWARD -j LOCATIONBLOCK
cab02e2a	223
5fd30232	224	# trafic from ipsecX/TUN/TAP interfaces, before "-i GREEN_DEV" accept everything
c581b670 MT	225	iptables -N IPSECINPUT
	226	iptables -N IPSECFORWARD
	227	iptables -N IPSECOUTPUT
	228	iptables -A INPUT -j IPSECINPUT
	229	iptables -A FORWARD -j IPSECFORWARD
	230	iptables -A OUTPUT -j IPSECOUTPUT
	231	iptables -t nat -N IPSECNAT
	232	iptables -t nat -A POSTROUTING -j IPSECNAT
b68e5c14	233
3a1019f6	234	# localhost and ethernet.
c0e0848f MT	235	# Always allow accessing the web GUI from GREEN.
	236	iptables -N GUIINPUT
	237	iptables -A INPUT -j GUIINPUT
48a7737f MT	238	if [ -n "${GREEN_DEV}" ]; then
	239	iptables -A GUIINPUT -i "${GREEN_DEV}" -p tcp --dport 444 -j ACCEPT
	240	fi
8490e496	241
81393987	242	# WIRELESS chains
c581b670 MT	243	iptables -N WIRELESSINPUT
	244	iptables -A INPUT -m conntrack --ctstate NEW -j WIRELESSINPUT
	245	iptables -N WIRELESSFORWARD
	246	iptables -A FORWARD -m conntrack --ctstate NEW -j WIRELESSFORWARD
987b75bc	247
ab4876ad	248	# OpenVPN
c581b670 MT	249	iptables -N OVPNINPUT
c581b670 MT	250	iptables -A INPUT -j OVPNINPUT
ab4876ad	251
5fc5f703	252	# Tor (inbound and outbound)
c581b670 MT	253	iptables -N TOR_INPUT
c581b670 MT	254	iptables -A INPUT -j TOR_INPUT
5fc5f703 PM	255	iptables -N TOR_OUTPUT
5fc5f703 PM	256	iptables -A OUTPUT -j TOR_OUTPUT
12dcfbbd	257
d5f1422d	258	# Jump into the actual firewall ruleset.
c581b670 MT	259	iptables -N INPUTFW
c581b670 MT	260	iptables -A INPUT -j INPUTFW
d5f1422d	261
c581b670 MT	262	iptables -N OUTGOINGFW
c581b670 MT	263	iptables -A OUTPUT -j OUTGOINGFW
d5f1422d	264
c581b670 MT	265	iptables -N FORWARDFW
c581b670 MT	266	iptables -A FORWARD -j FORWARDFW
d5f1422d	267
fac38614	268	# SNAT rules
c581b670 MT	269	iptables -t nat -N NAT_SOURCE
c581b670 MT	270	iptables -t nat -A POSTROUTING -j NAT_SOURCE
fac38614	271
9bb40553 MT	272	# Captive Portal
	273	iptables -t nat -N CAPTIVE_PORTAL
	274	iptables -t nat -A PREROUTING -j CAPTIVE_PORTAL
	275
bb12dd7b	276	# Custom prerouting chains (for transparent proxy)
c581b670 MT	277	iptables -t nat -N SQUID
c581b670 MT	278	iptables -t nat -A PREROUTING -j SQUID
bb12dd7b MT	279
bb12dd7b MT	280	# DNAT rules
c581b670 MT	281	iptables -t nat -N NAT_DESTINATION
c581b670 MT	282	iptables -t nat -A PREROUTING -j NAT_DESTINATION
99f11a16	283	iptables -t nat -A OUTPUT -j NAT_DESTINATION
bb12dd7b	284
6e87f0aa MT	285	iptables -t mangle -N NAT_DESTINATION
	286	iptables -t mangle -A PREROUTING -j NAT_DESTINATION
	287
	288	iptables -t nat -N NAT_DESTINATION_FIX
	289	iptables -t nat -A POSTROUTING -j NAT_DESTINATION_FIX
	290
48a7737f MT	291	if [ -n "${GREEN_ADDRESS}" ]; then
48a7737f MT	292	iptables -t nat -A NAT_DESTINATION_FIX \
ce31144c	293	-m mark --mark "0x01000000/${NAT_MASK}" -j SNAT --to-source "${GREEN_ADDRESS}"
48a7737f	294	fi
6e87f0aa MT	295
	296	if [ -n "${BLUE_ADDRESS}" ]; then
	297	iptables -t nat -A NAT_DESTINATION_FIX \
ce31144c	298	-m mark --mark "0x02000000/${NAT_MASK}" -j SNAT --to-source "${BLUE_ADDRESS}"
6e87f0aa MT	299	fi
	300
	301	if [ -n "${ORANGE_ADDRESS}" ]; then
	302	iptables -t nat -A NAT_DESTINATION_FIX \
ce31144c	303	-m mark --mark "0x04000000/${NAT_MASK}" -j SNAT --to-source "${ORANGE_ADDRESS}"
6e87f0aa MT	304	fi
6e87f0aa MT	305
6e87f0aa MT	306	# RED chain, used for the red interface
	307	iptables -N REDINPUT
	308	iptables -A INPUT -j REDINPUT
	309	iptables -N REDFORWARD
	310	iptables -A FORWARD -j REDFORWARD
	311	iptables -t nat -N REDNAT
	312	iptables -t nat -A POSTROUTING -j REDNAT
	313
6c920b19 MT	314	# Populate IPsec chains
6c920b19 MT	315	/usr/lib/firewall/ipsec-policy
80fbd899	316
ab4876ad MT	317	# Apply OpenVPN firewall rules
ab4876ad MT	318	/usr/local/bin/openvpnctrl --firewall-rules
ff4770c7 AM	319
	320	# run wirelessctrl
	321	/usr/local/bin/wirelessctrl
	322
1722701a AM	323	# run captivectrl
	324	/usr/local/bin/captivectrl
	325
c581b670 MT	326	# POLICY CHAIN
	327	iptables -N POLICYIN
	328	iptables -A INPUT -j POLICYIN
	329	iptables -N POLICYFWD
	330	iptables -A FORWARD -j POLICYFWD
	331	iptables -N POLICYOUT
	332	iptables -A OUTPUT -j POLICYOUT
b324de14	333
bb383423	334	# Initialize firewall policies.
5d7faa45	335	/usr/sbin/firewall-policy
690b0bd7	336
bb383423	337	# Install firewall rules for the red interface.
4b12aa41 TE	338	iptables_red_up
	339
	340	# If red has not been brought up yet, we will
	341	# add the blocking rules for MASQUERADE
	342	if [ ! -e "/var/ipfire/red/active" ]; then
	343	iptables_red_down
	344	fi
ff4770c7	345	}
3a1019f6	346
4b12aa41	347	iptables_red_up() {
c581b670 MT	348	iptables -F REDINPUT
	349	iptables -F REDFORWARD
	350	iptables -t nat -F REDNAT
3a1019f6	351
ff4770c7 AM	352	# PPPoE / PPTP Device
	353	if [ "$IFACE" != "" ]; then
	354	# PPPoE / PPTP
	355	if [ "$DEVICE" != "" ]; then
c581b670	356	iptables -A REDINPUT -i $DEVICE -j ACCEPT
ff4770c7 AM	357	fi
	358	if [ "$RED_TYPE" == "PPTP" -o "$RED_TYPE" == "PPPOE" ]; then
	359	if [ "$RED_DEV" != "" ]; then
c581b670	360	iptables -A REDINPUT -i $RED_DEV -j ACCEPT
ff4770c7 AM	361	fi
ff4770c7 AM	362	fi
3a1019f6	363	fi
ff4770c7 AM	364
	365	# PPTP over DHCP
	366	if [ "$DEVICE" != "" -a "$TYPE" == "PPTP" -a "$METHOD" == "DHCP" ]; then
c581b670 MT	367	iptables -A REDINPUT -p tcp --source-port 67 --destination-port 68 -i $DEVICE -j ACCEPT
c581b670 MT	368	iptables -A REDINPUT -p udp --source-port 67 --destination-port 68 -i $DEVICE -j ACCEPT
3a1019f6 MT	369	fi
3a1019f6 MT	370
ff4770c7 AM	371	if [ "$IFACE" != "" -a -f /var/ipfire/red/active ]; then
	372	# DHCP
	373	if [ "$RED_DEV" != "" -a "$RED_TYPE" == "DHCP" ]; then
c581b670 MT	374	iptables -A REDINPUT -p tcp --source-port 67 --destination-port 68 -i $IFACE -j ACCEPT
c581b670 MT	375	iptables -A REDINPUT -p udp --source-port 67 --destination-port 68 -i $IFACE -j ACCEPT
ff4770c7 AM	376	fi
ff4770c7 AM	377	if [ "$METHOD" == "DHCP" -a "$PROTOCOL" == "RFC1483" ]; then
c581b670 MT	378	iptables -A REDINPUT -p tcp --source-port 67 --destination-port 68 -i $IFACE -j ACCEPT
c581b670 MT	379	iptables -A REDINPUT -p udp --source-port 67 --destination-port 68 -i $IFACE -j ACCEPT
ff4770c7 AM	380	fi
ff4770c7 AM	381
51c4b73f MT	382	# Outgoing masquerading (don't masqerade IPsec)
51c4b73f MT	383	iptables -t nat -A REDNAT -m mark --mark "${IPSEC_MARK}/${IPSEC_MASK}" -o "${IFACE}" -j RETURN
c926c637	384
60fcb241 AF	385	if [ "${IFACE}" = "${GREEN_DEV}" ]; then
60fcb241 AF	386	iptables -t nat -A REDNAT -i "${GREEN_DEV}" -o "${IFACE}" -j RETURN
c926c637	387	fi
c400fe4c	388
983d471f	389	local NO_MASQ_NETWORKS
83ef9c40 MT	390
83ef9c40 MT	391	if [ "${MASQUERADE_GREEN}" = "off" ]; then
983d471f	392	NO_MASQ_NETWORKS="${NO_MASQ_NETWORKS} ${GREEN_NETADDRESS}/${GREEN_NETMASK}"
83ef9c40 MT	393	fi
	394
	395	if [ "${MASQUERADE_BLUE}" = "off" ]; then
983d471f	396	NO_MASQ_NETWORKS="${NO_MASQ_NETWORKS} ${BLUE_NETADDRESS}/${BLUE_NETMASK}"
83ef9c40 MT	397	fi
	398
	399	if [ "${MASQUERADE_ORANGE}" = "off" ]; then
983d471f	400	NO_MASQ_NETWORKS="${NO_MASQ_NETWORKS} ${ORANGE_NETADDRESS}/${ORANGE_NETMASK}"
83ef9c40 MT	401	fi
83ef9c40 MT	402
983d471f MT	403	local network
	404	for network in ${NO_MASQ_NETWORKS}; do
	405	iptables -t nat -A REDNAT -s "${network}" -o "${IFACE}" -j RETURN
83ef9c40 MT	406	done
	407
	408	# Masquerade everything else
	409	iptables -t nat -A REDNAT -o $IFACE -j MASQUERADE
6be0579b	410	fi
66f6b279 MT	411
66f6b279 MT	412	# Reload all rules.
55a5bcae	413	/usr/local/bin/firewallctrl
ff4770c7 AM	414	}
ff4770c7 AM	415
4b12aa41 TE	416	iptables_red_down() {
4b12aa41 TE	417	# Prohibit packets to reach the masquerading rule
e01e07ec	418	# while the WAN interface is down - this is required to
4b12aa41 TE	419	# circumvent udp related NAT issues
4b12aa41 TE	420	# http://forum.ipfire.org/index.php?topic=11127.0
e7204c2d MT	421	if [ -n "${IFACE}" ]; then
	422	iptables -F REDFORWARD
	423	iptables -A REDFORWARD -o "${IFACE}" -j DROP
	424	fi
4b12aa41 TE	425
	426	# Reload all rules.
	427	/usr/local/bin/firewallctrl
	428	}
	429
ff4770c7 AM	430	# See how we were called.
	431	case "$1" in
	432	start)
7d7740a4	433	boot_mesg "Setting up firewall"
ff4770c7	434	iptables_init
7d7740a4	435	evaluate_retval
6be0579b	436	;;
4b12aa41	437	reload\|up)
7d7740a4	438	boot_mesg "Reloading firewall"
4b12aa41	439	iptables_red_up
7d7740a4	440	evaluate_retval
3a1019f6	441	;;
4b12aa41 TE	442	down)
	443	boot_mesg "Disabling firewall access to RED"
	444	iptables_red_down
	445	evaluate_retval
	446	;;
3a1019f6	447	restart)
3a1019f6 MT	448	$0 start
	449	;;
	450	*)
ff4770c7	451	echo "Usage: $0 {start\|reload\|restart}"
3a1019f6 MT	452	exit 1
	453	;;
	454	esac
	455
	456	exit 0