[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"

IPS_REPEAT_MARK="0x80000000"
IPS_REPEAT_MASK="0x80000000"
IPS_BYPASS_MARK="0x40000000"
IPS_BYPASS_MASK="0x40000000"

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

	# IPS Bypass Chain which stores the BYPASS bit in connection tracking
	iptables -N IPSBYPASS
	iptables -A IPSBYPASS -j CONNMARK --save-mark --mask "$(( ~IPS_REPEAT_MASK & 0xffffffff ))"

	# Jump into bypass chain when the BYPASS bit is set
	for chain in INPUT FORWARD OUTPUT; do
		iptables -A "${chain}" -m mark \
			--mark "$(( IPS_REPEAT_MARK | IPS_BYPASS_MARK ))/$(( IPS_REPEAT_MASK | IPS_BYPASS_MASK ))" -j IPSBYPASS
	done

	# 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 LOG_DROP
	iptables -A CONNTRACK -p icmp -m conntrack --ctstate RELATED -j ACCEPT

	# 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

	for chain in INPUT FORWARD OUTPUT; do
		iptables -A "${chain}" -m mark --mark "0x0/$(( IPS_REPEAT_MASK | IPS_BYPASS_MASK ))" -j "IPS_${chain}"
	done

	# 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 policy --pol ipsec --dir=out -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 $(/usr/local/bin/readhash /var/ipfire/optionsfw/settings)
3a1019f6 MT	9	IFACE=`/bin/cat /var/ipfire/red/iface 2> /dev/null \| /usr/bin/tr -d '\012'`
	10
	11	if [ -f /var/ipfire/red/device ]; then
	12	DEVICE=`/bin/cat /var/ipfire/red/device 2> /dev/null \| /usr/bin/tr -d '\012'`
	13	fi
	14
ce31144c MT	15	NAT_MASK="0x0f000000"
ce31144c MT	16
3fa8300e MT	17	IPS_REPEAT_MARK="0x80000000"
	18	IPS_REPEAT_MASK="0x80000000"
	19	IPS_BYPASS_MARK="0x40000000"
	20	IPS_BYPASS_MASK="0x40000000"
	21
c581b670 MT	22	function iptables() {
	23	/sbin/iptables --wait "$@"
	24	}
	25
3a1019f6 MT	26	iptables_init() {
3a1019f6 MT	27	# Flush all rules and delete all custom chains
c581b670 MT	28	iptables -F
	29	iptables -t nat -F
	30	iptables -t mangle -F
b1109b8a	31	iptables -t raw -F
c581b670 MT	32	iptables -X
	33	iptables -t nat -X
	34	iptables -t mangle -X
b1109b8a	35	iptables -t raw -X
3a1019f6 MT	36
3a1019f6 MT	37	# Set up policies
c581b670 MT	38	iptables -P INPUT DROP
	39	iptables -P FORWARD DROP
	40	iptables -P OUTPUT ACCEPT
3a1019f6	41
78b65ea7 MT	42	# Enable TRACE logging to syslog
	43	modprobe nf_log_ipv4
	44	sysctl -q -w net.netfilter.nf_log.2=nf_log_ipv4
	45
3fa8300e MT	46	# IPS Bypass Chain which stores the BYPASS bit in connection tracking
3fa8300e MT	47	iptables -N IPSBYPASS
19357bc5	48	iptables -A IPSBYPASS -j CONNMARK --save-mark --mask "$(( ~IPS_REPEAT_MASK & 0xffffffff ))"
3fa8300e MT	49
	50	# Jump into bypass chain when the BYPASS bit is set
	51	for chain in INPUT FORWARD OUTPUT; do
	52	iptables -A "${chain}" -m mark \
	53	--mark "$(( IPS_REPEAT_MARK \| IPS_BYPASS_MARK ))/$(( IPS_REPEAT_MASK \| IPS_BYPASS_MASK ))" -j IPSBYPASS
	54	done
	55
3a1019f6	56	# Empty LOG_DROP and LOG_REJECT chains
c581b670	57	iptables -N LOG_DROP
8ee3a135	58	iptables -A LOG_DROP -m limit --limit 10/second -j LOG
c581b670 MT	59	iptables -A LOG_DROP -j DROP
c581b670 MT	60	iptables -N LOG_REJECT
8ee3a135	61	iptables -A LOG_REJECT -m limit --limit 10/second -j LOG
c581b670	62	iptables -A LOG_REJECT -j REJECT
3a1019f6 MT	63
3a1019f6 MT	64	# This chain will log, then DROPs packets with certain bad combinations
ef7e9e52	65	# of flags might indicate a port-scan attempt (xmas, null, etc.)
c581b670	66	iptables -N PSCAN
5595bc03	67	if [ "$DROPPORTSCAN" == "on" ]; then
ef7e9e52 PM	68	iptables -A PSCAN -p tcp -m limit --limit 10/second -j LOG --log-prefix "DROP_TCP Scan " -m comment --comment "DROP_TCP PScan"
ef7e9e52 PM	69	iptables -A PSCAN -p udp -m limit --limit 10/second -j LOG --log-prefix "DROP_UDP Scan " -m comment --comment "DROP_UDP PScan"
8ee3a135 PM	70	iptables -A PSCAN -p icmp -m limit --limit 10/second -j LOG --log-prefix "DROP_ICMP Scan " -m comment --comment "DROP_ICMP PScan"
8ee3a135 PM	71	iptables -A PSCAN -f -m limit --limit 10/second -j LOG --log-prefix "DROP_FRAG Scan " -m comment --comment "DROP_FRAG PScan"
5595bc03	72	fi
c581b670	73	iptables -A PSCAN -j DROP -m comment --comment "DROP_PScan"
3a1019f6 MT	74
3a1019f6 MT	75	# New tcp packets without SYN set - could well be an obscure type of port scan
ef7e9e52	76	# that's not covered above, may just be a broken Windows machine
c581b670	77	iptables -N NEWNOTSYN
5595bc03	78	if [ "$DROPNEWNOTSYN" == "on" ]; then
8ee3a135	79	iptables -A NEWNOTSYN -m limit --limit 10/second -j LOG --log-prefix "DROP_NEWNOTSYN "
5595bc03	80	fi
c581b670	81	iptables -A NEWNOTSYN -j DROP -m comment --comment "DROP_NEWNOTSYN"
3a1019f6 MT	82
3a1019f6 MT	83	# Chain to contain all the rules relating to bad TCP flags
c581b670	84	iptables -N BADTCP
3a1019f6	85
c581b670 MT	86	# Don't check loopback
c581b670 MT	87	iptables -A BADTCP -i lo -j RETURN
d8158ca6	88
3a1019f6	89	# Disallow packets frequently used by port-scanners
dccbf1bf AF	90	# NMAP FIN/URG/PSH (XMAS scan)
	91	iptables -A BADTCP -p tcp --tcp-flags ALL FIN,URG,PSH -j PSCAN
	92	# SYN/RST/ACK/FIN/URG
	93	iptables -A BADTCP -p tcp --tcp-flags ALL SYN,RST,ACK,FIN,URG -j PSCAN
	94	# ALL/ALL
	95	iptables -A BADTCP -p tcp --tcp-flags ALL ALL -j PSCAN
	96	# FIN Stealth
c581b670	97	iptables -A BADTCP -p tcp --tcp-flags ALL FIN -j PSCAN
3a1019f6	98	# SYN/RST (also catches xmas variants that set SYN+RST+...)
c581b670	99	iptables -A BADTCP -p tcp --tcp-flags SYN,RST SYN,RST -j PSCAN
3a1019f6	100	# SYN/FIN (QueSO or nmap OS probe)
c581b670	101	iptables -A BADTCP -p tcp --tcp-flags SYN,FIN SYN,FIN -j PSCAN
dccbf1bf AF	102	# Null
dccbf1bf AF	103	iptables -A BADTCP -p tcp --tcp-flags ALL NONE -j PSCAN
3a1019f6	104	# NEW TCP without SYN
c581b670	105	iptables -A BADTCP -p tcp ! --syn -m conntrack --ctstate NEW -j NEWNOTSYN
b85d2a98	106
c581b670 MT	107	iptables -A INPUT -p tcp -j BADTCP
c581b670 MT	108	iptables -A FORWARD -p tcp -j BADTCP
c0359d6d	109
b1109b8a	110	# Connection tracking chains
c581b670	111	iptables -N CONNTRACK
b1109b8a	112	iptables -A CONNTRACK -m conntrack --ctstate ESTABLISHED -j ACCEPT
0e7bfb13	113	iptables -A CONNTRACK -m conntrack --ctstate INVALID -j LOG_DROP
0f535060	114	iptables -A CONNTRACK -p icmp -m conntrack --ctstate RELATED -j ACCEPT
b1109b8a	115
c825fcef MT	116	# Restore any connection marks
	117	iptables -t mangle -A PREROUTING -j CONNMARK --restore-mark
	118
ef7e9e52	119	# Fix for braindead ISPs
c581b670	120	iptables -A FORWARD -p tcp --tcp-flags SYN,RST SYN -j TCPMSS --clamp-mss-to-pmtu
3a1019f6 MT	121
3a1019f6 MT	122	# CUSTOM chains, can be used by the users themselves
c581b670 MT	123	iptables -N CUSTOMINPUT
	124	iptables -A INPUT -j CUSTOMINPUT
	125	iptables -N CUSTOMFORWARD
	126	iptables -A FORWARD -j CUSTOMFORWARD
	127	iptables -N CUSTOMOUTPUT
	128	iptables -A OUTPUT -j CUSTOMOUTPUT
	129	iptables -t nat -N CUSTOMPREROUTING
	130	iptables -t nat -A PREROUTING -j CUSTOMPREROUTING
	131	iptables -t nat -N CUSTOMPOSTROUTING
	132	iptables -t nat -A POSTROUTING -j CUSTOMPOSTROUTING
3a1019f6	133
2a5b19c5 AF	134	# P2PBLOCK
	135	iptables -N P2PBLOCK
	136	iptables -A INPUT -j P2PBLOCK
	137	iptables -A FORWARD -j P2PBLOCK
	138	iptables -A OUTPUT -j P2PBLOCK
0e7bfb13	139
ef7e9e52	140	# IPS (Guardian) chains
c581b670 MT	141	iptables -N GUARDIAN
	142	iptables -A INPUT -j GUARDIAN
	143	iptables -A FORWARD -j GUARDIAN
815eaff4	144
80fbd899 MT	145	# Block non-established IPsec networks
	146	iptables -N IPSECBLOCK
	147	iptables -A FORWARD -m policy --dir out --pol none -j IPSECBLOCK
	148	iptables -A OUTPUT -m policy --dir out --pol none -j IPSECBLOCK
	149
1e555330	150	# Block OpenVPN transfer networks
c581b670	151	iptables -N OVPNBLOCK
a0a5c14f	152	iptables -A INPUT -i tun+ -j OVPNBLOCK
a0a5c14f MT	153	iptables -A FORWARD -i tun+ -j OVPNBLOCK
a0a5c14f MT	154	iptables -A FORWARD -o tun+ -j OVPNBLOCK
1e555330	155
ef7e9e52	156	# IPS (Suricata) chains
5dba8382 PM	157	iptables -N IPS_INPUT
	158	iptables -N IPS_FORWARD
	159	iptables -N IPS_OUTPUT
3fa8300e MT	160
	161	for chain in INPUT FORWARD OUTPUT; do
	162	iptables -A "${chain}" -m mark --mark "0x0/$(( IPS_REPEAT_MASK \| IPS_BYPASS_MASK ))" -j "IPS_${chain}"
	163	done
5dba8382	164
51ab1de1	165	# OpenVPN transfer network translation
c581b670 MT	166	iptables -t nat -N OVPNNAT
c581b670 MT	167	iptables -t nat -A POSTROUTING -j OVPNNAT
51ab1de1	168
daa1ceba	169	# IPTV chains for IGMPPROXY
c581b670 MT	170	iptables -N IPTVINPUT
	171	iptables -A INPUT -j IPTVINPUT
	172	iptables -N IPTVFORWARD
	173	iptables -A FORWARD -j IPTVFORWARD
daa1ceba	174
8e59a602 MT	175	# Allow to ping the firewall.
	176	iptables -N ICMPINPUT
	177	iptables -A INPUT -j ICMPINPUT
	178	iptables -A ICMPINPUT -p icmp --icmp-type 8 -j ACCEPT
3a1019f6	179
afc611d4	180	# Accept everything on loopback
c581b670 MT	181	iptables -N LOOPBACK
	182	iptables -A LOOPBACK -i lo -j ACCEPT
	183	iptables -A LOOPBACK -o lo -j ACCEPT
afc611d4	184
3b9a23ce	185	# Filter all packets with loopback addresses on non-loopback interfaces.
c581b670 MT	186	iptables -A LOOPBACK -s 127.0.0.0/8 -j DROP
c581b670 MT	187	iptables -A LOOPBACK -d 127.0.0.0/8 -j DROP
3b9a23ce MT	188
3b9a23ce MT	189	for i in INPUT FORWARD OUTPUT; do
c581b670	190	iptables -A ${i} -j LOOPBACK
3b9a23ce	191	done
afc611d4	192
bbaa3613 AM	193	# Captive portal
	194	iptables -N CAPTIVE_PORTAL
	195	iptables -N CAPTIVE_PORTAL_CLIENTS
	196	for i in INPUT FORWARD; do
	197	iptables -A ${i} -j CAPTIVE_PORTAL
	198	done
	199
3a1019f6	200	# Accept everything connected
b85d2a98	201	for i in INPUT FORWARD OUTPUT; do
c581b670	202	iptables -A ${i} -j CONNTRACK
b85d2a98 MT	203	done
b85d2a98 MT	204
8490e496 MT	205	# Allow DHCP
	206	iptables -N DHCPINPUT
	207	iptables -A DHCPINPUT -p udp --sport 68 --dport 67 -j ACCEPT
	208	iptables -A DHCPINPUT -p tcp --sport 68 --dport 67 -j ACCEPT
	209
	210	iptables -N DHCPOUTPUT
	211	iptables -A DHCPOUTPUT -p udp --sport 67 --dport 68 -j ACCEPT
	212	iptables -A DHCPOUTPUT -p tcp --sport 67 --dport 68 -j ACCEPT
	213
	214	# Allow DHCP on GREEN
	215	iptables -N DHCPGREENINPUT
	216	iptables -N DHCPGREENOUTPUT
	217	if [ -n "${GREEN_DEV}" ]; then
	218	iptables -A INPUT -i "${GREEN_DEV}" -j DHCPGREENINPUT
	219	iptables -A OUTPUT -o "${GREEN_DEV}" -j DHCPGREENOUTPUT
	220	fi
	221
ef7e9e52	222	# Allow DHCP on BLUE to be turned on/off
8490e496 MT	223	iptables -N DHCPBLUEINPUT
	224	iptables -N DHCPBLUEOUTPUT
	225	if [ -n "${BLUE_DEV}" ]; then
	226	iptables -A INPUT -i "${BLUE_DEV}" -j DHCPBLUEINPUT
	227	iptables -A OUTPUT -o "${BLUE_DEV}" -j DHCPBLUEOUTPUT
	228	fi
	229
0e6eca78 MT	230	# Location Block
	231	iptables -N LOCATIONBLOCK
	232	iptables -A INPUT -j LOCATIONBLOCK
	233	iptables -A FORWARD -j LOCATIONBLOCK
cab02e2a	234
5fd30232	235	# trafic from ipsecX/TUN/TAP interfaces, before "-i GREEN_DEV" accept everything
c581b670 MT	236	iptables -N IPSECINPUT
	237	iptables -N IPSECFORWARD
	238	iptables -N IPSECOUTPUT
	239	iptables -A INPUT -j IPSECINPUT
	240	iptables -A FORWARD -j IPSECFORWARD
	241	iptables -A OUTPUT -j IPSECOUTPUT
	242	iptables -t nat -N IPSECNAT
	243	iptables -t nat -A POSTROUTING -j IPSECNAT
b68e5c14	244
3a1019f6	245	# localhost and ethernet.
c0e0848f MT	246	# Always allow accessing the web GUI from GREEN.
	247	iptables -N GUIINPUT
	248	iptables -A INPUT -j GUIINPUT
48a7737f MT	249	if [ -n "${GREEN_DEV}" ]; then
	250	iptables -A GUIINPUT -i "${GREEN_DEV}" -p tcp --dport 444 -j ACCEPT
	251	fi
8490e496	252
81393987	253	# WIRELESS chains
c581b670 MT	254	iptables -N WIRELESSINPUT
	255	iptables -A INPUT -m conntrack --ctstate NEW -j WIRELESSINPUT
	256	iptables -N WIRELESSFORWARD
	257	iptables -A FORWARD -m conntrack --ctstate NEW -j WIRELESSFORWARD
987b75bc	258
ab4876ad	259	# OpenVPN
c581b670 MT	260	iptables -N OVPNINPUT
c581b670 MT	261	iptables -A INPUT -j OVPNINPUT
ab4876ad	262
5fc5f703	263	# Tor (inbound and outbound)
c581b670 MT	264	iptables -N TOR_INPUT
c581b670 MT	265	iptables -A INPUT -j TOR_INPUT
5fc5f703 PM	266	iptables -N TOR_OUTPUT
5fc5f703 PM	267	iptables -A OUTPUT -j TOR_OUTPUT
0e7bfb13	268
d5f1422d	269	# Jump into the actual firewall ruleset.
c581b670 MT	270	iptables -N INPUTFW
c581b670 MT	271	iptables -A INPUT -j INPUTFW
d5f1422d	272
c581b670 MT	273	iptables -N OUTGOINGFW
c581b670 MT	274	iptables -A OUTPUT -j OUTGOINGFW
d5f1422d	275
c581b670 MT	276	iptables -N FORWARDFW
c581b670 MT	277	iptables -A FORWARD -j FORWARDFW
d5f1422d	278
fac38614	279	# SNAT rules
c581b670 MT	280	iptables -t nat -N NAT_SOURCE
c581b670 MT	281	iptables -t nat -A POSTROUTING -j NAT_SOURCE
fac38614	282
9bb40553 MT	283	# Captive Portal
	284	iptables -t nat -N CAPTIVE_PORTAL
	285	iptables -t nat -A PREROUTING -j CAPTIVE_PORTAL
	286
bb12dd7b	287	# Custom prerouting chains (for transparent proxy)
c581b670 MT	288	iptables -t nat -N SQUID
c581b670 MT	289	iptables -t nat -A PREROUTING -j SQUID
bb12dd7b MT	290
bb12dd7b MT	291	# DNAT rules
c581b670 MT	292	iptables -t nat -N NAT_DESTINATION
c581b670 MT	293	iptables -t nat -A PREROUTING -j NAT_DESTINATION
99f11a16	294	iptables -t nat -A OUTPUT -j NAT_DESTINATION
bb12dd7b	295
6e87f0aa MT	296	iptables -t mangle -N NAT_DESTINATION
	297	iptables -t mangle -A PREROUTING -j NAT_DESTINATION
	298
	299	iptables -t nat -N NAT_DESTINATION_FIX
	300	iptables -t nat -A POSTROUTING -j NAT_DESTINATION_FIX
	301
48a7737f MT	302	if [ -n "${GREEN_ADDRESS}" ]; then
48a7737f MT	303	iptables -t nat -A NAT_DESTINATION_FIX \
ce31144c	304	-m mark --mark "0x01000000/${NAT_MASK}" -j SNAT --to-source "${GREEN_ADDRESS}"
48a7737f	305	fi
6e87f0aa MT	306
	307	if [ -n "${BLUE_ADDRESS}" ]; then
	308	iptables -t nat -A NAT_DESTINATION_FIX \
ce31144c	309	-m mark --mark "0x02000000/${NAT_MASK}" -j SNAT --to-source "${BLUE_ADDRESS}"
6e87f0aa MT	310	fi
	311
	312	if [ -n "${ORANGE_ADDRESS}" ]; then
	313	iptables -t nat -A NAT_DESTINATION_FIX \
ce31144c	314	-m mark --mark "0x04000000/${NAT_MASK}" -j SNAT --to-source "${ORANGE_ADDRESS}"
6e87f0aa MT	315	fi
6e87f0aa MT	316
6e87f0aa MT	317	# RED chain, used for the red interface
	318	iptables -N REDINPUT
	319	iptables -A INPUT -j REDINPUT
	320	iptables -N REDFORWARD
	321	iptables -A FORWARD -j REDFORWARD
	322	iptables -t nat -N REDNAT
	323	iptables -t nat -A POSTROUTING -j REDNAT
	324
6c920b19 MT	325	# Populate IPsec chains
6c920b19 MT	326	/usr/lib/firewall/ipsec-policy
80fbd899	327
ab4876ad MT	328	# Apply OpenVPN firewall rules
ab4876ad MT	329	/usr/local/bin/openvpnctrl --firewall-rules
ff4770c7 AM	330
	331	# run wirelessctrl
	332	/usr/local/bin/wirelessctrl
	333
1722701a AM	334	# run captivectrl
	335	/usr/local/bin/captivectrl
	336
c581b670 MT	337	# POLICY CHAIN
	338	iptables -N POLICYIN
	339	iptables -A INPUT -j POLICYIN
	340	iptables -N POLICYFWD
	341	iptables -A FORWARD -j POLICYFWD
	342	iptables -N POLICYOUT
	343	iptables -A OUTPUT -j POLICYOUT
b324de14	344
bb383423	345	# Initialize firewall policies.
5d7faa45	346	/usr/sbin/firewall-policy
690b0bd7	347
bb383423	348	# Install firewall rules for the red interface.
4b12aa41 TE	349	iptables_red_up
	350
	351	# If red has not been brought up yet, we will
	352	# add the blocking rules for MASQUERADE
	353	if [ ! -e "/var/ipfire/red/active" ]; then
	354	iptables_red_down
	355	fi
ff4770c7	356	}
3a1019f6	357
4b12aa41	358	iptables_red_up() {
c581b670 MT	359	iptables -F REDINPUT
	360	iptables -F REDFORWARD
	361	iptables -t nat -F REDNAT
3a1019f6	362
ff4770c7 AM	363	# PPPoE / PPTP Device
	364	if [ "$IFACE" != "" ]; then
	365	# PPPoE / PPTP
	366	if [ "$DEVICE" != "" ]; then
c581b670	367	iptables -A REDINPUT -i $DEVICE -j ACCEPT
ff4770c7 AM	368	fi
	369	if [ "$RED_TYPE" == "PPTP" -o "$RED_TYPE" == "PPPOE" ]; then
	370	if [ "$RED_DEV" != "" ]; then
c581b670	371	iptables -A REDINPUT -i $RED_DEV -j ACCEPT
ff4770c7 AM	372	fi
ff4770c7 AM	373	fi
3a1019f6	374	fi
ff4770c7 AM	375
	376	# PPTP over DHCP
	377	if [ "$DEVICE" != "" -a "$TYPE" == "PPTP" -a "$METHOD" == "DHCP" ]; then
c581b670 MT	378	iptables -A REDINPUT -p tcp --source-port 67 --destination-port 68 -i $DEVICE -j ACCEPT
c581b670 MT	379	iptables -A REDINPUT -p udp --source-port 67 --destination-port 68 -i $DEVICE -j ACCEPT
3a1019f6 MT	380	fi
3a1019f6 MT	381
ff4770c7 AM	382	if [ "$IFACE" != "" -a -f /var/ipfire/red/active ]; then
	383	# DHCP
	384	if [ "$RED_DEV" != "" -a "$RED_TYPE" == "DHCP" ]; then
c581b670 MT	385	iptables -A REDINPUT -p tcp --source-port 67 --destination-port 68 -i $IFACE -j ACCEPT
c581b670 MT	386	iptables -A REDINPUT -p udp --source-port 67 --destination-port 68 -i $IFACE -j ACCEPT
ff4770c7 AM	387	fi
ff4770c7 AM	388	if [ "$METHOD" == "DHCP" -a "$PROTOCOL" == "RFC1483" ]; then
c581b670 MT	389	iptables -A REDINPUT -p tcp --source-port 67 --destination-port 68 -i $IFACE -j ACCEPT
c581b670 MT	390	iptables -A REDINPUT -p udp --source-port 67 --destination-port 68 -i $IFACE -j ACCEPT
ff4770c7 AM	391	fi
ff4770c7 AM	392
51c4b73f	393	# Outgoing masquerading (don't masqerade IPsec)
e850a614	394	iptables -t nat -A REDNAT -m policy --pol ipsec --dir=out -o "${IFACE}" -j RETURN
c926c637	395
60fcb241 AF	396	if [ "${IFACE}" = "${GREEN_DEV}" ]; then
60fcb241 AF	397	iptables -t nat -A REDNAT -i "${GREEN_DEV}" -o "${IFACE}" -j RETURN
c926c637	398	fi
c400fe4c	399
983d471f	400	local NO_MASQ_NETWORKS
83ef9c40 MT	401
83ef9c40 MT	402	if [ "${MASQUERADE_GREEN}" = "off" ]; then
983d471f	403	NO_MASQ_NETWORKS="${NO_MASQ_NETWORKS} ${GREEN_NETADDRESS}/${GREEN_NETMASK}"
83ef9c40 MT	404	fi
	405
	406	if [ "${MASQUERADE_BLUE}" = "off" ]; then
983d471f	407	NO_MASQ_NETWORKS="${NO_MASQ_NETWORKS} ${BLUE_NETADDRESS}/${BLUE_NETMASK}"
83ef9c40 MT	408	fi
	409
	410	if [ "${MASQUERADE_ORANGE}" = "off" ]; then
983d471f	411	NO_MASQ_NETWORKS="${NO_MASQ_NETWORKS} ${ORANGE_NETADDRESS}/${ORANGE_NETMASK}"
83ef9c40 MT	412	fi
83ef9c40 MT	413
983d471f MT	414	local network
	415	for network in ${NO_MASQ_NETWORKS}; do
	416	iptables -t nat -A REDNAT -s "${network}" -o "${IFACE}" -j RETURN
83ef9c40 MT	417	done
	418
	419	# Masquerade everything else
	420	iptables -t nat -A REDNAT -o $IFACE -j MASQUERADE
6be0579b	421	fi
66f6b279 MT	422
66f6b279 MT	423	# Reload all rules.
55a5bcae	424	/usr/local/bin/firewallctrl
ff4770c7 AM	425	}
ff4770c7 AM	426
4b12aa41 TE	427	iptables_red_down() {
4b12aa41 TE	428	# Prohibit packets to reach the masquerading rule
e01e07ec	429	# while the WAN interface is down - this is required to
4b12aa41 TE	430	# circumvent udp related NAT issues
4b12aa41 TE	431	# http://forum.ipfire.org/index.php?topic=11127.0
e7204c2d MT	432	if [ -n "${IFACE}" ]; then
	433	iptables -F REDFORWARD
	434	iptables -A REDFORWARD -o "${IFACE}" -j DROP
	435	fi
4b12aa41 TE	436
	437	# Reload all rules.
	438	/usr/local/bin/firewallctrl
	439	}
	440
ff4770c7 AM	441	# See how we were called.
	442	case "$1" in
	443	start)
7d7740a4	444	boot_mesg "Setting up firewall"
ff4770c7	445	iptables_init
7d7740a4	446	evaluate_retval
6be0579b	447	;;
4b12aa41	448	reload\|up)
7d7740a4	449	boot_mesg "Reloading firewall"
4b12aa41	450	iptables_red_up
7d7740a4	451	evaluate_retval
3a1019f6	452	;;
4b12aa41 TE	453	down)
	454	boot_mesg "Disabling firewall access to RED"
	455	iptables_red_down
	456	evaluate_retval
	457	;;
3a1019f6	458	restart)
3a1019f6 MT	459	$0 start
	460	;;
	461	*)
ff4770c7	462	echo "Usage: $0 {start\|reload\|restart}"
3a1019f6 MT	463	exit 1
	464	;;
	465	esac
	466
	467	exit 0