--- /dev/null
+#!/bin/sh
+#
+# $Id: rc.firewall,v 1.7.2.20 2006/01/12 01:24:30 franck78 Exp $
+#
+
+eval $(/usr/local/bin/readhash CONFIG_ROOT/ppp/settings)
+eval $(/usr/local/bin/readhash CONFIG_ROOT/ethernet/settings)
+IFACE=`/bin/cat CONFIG_ROOT/red/iface 2> /dev/null | /usr/bin/tr -d '\012'`
+
+if [ -f CONFIG_ROOT/red/device ]; then
+ DEVICE=`/bin/cat CONFIG_ROOT/red/device 2> /dev/null | /usr/bin/tr -d '\012'`
+fi
+
+iptables_init() {
+ # Flush all rules and delete all custom chains
+ /sbin/iptables -F
+ /sbin/iptables -t nat -F
+ /sbin/iptables -t mangle -F
+ /sbin/iptables -X
+ /sbin/iptables -t nat -X
+ /sbin/iptables -t mangle -X
+
+ # Set up policies
+ /sbin/iptables -P INPUT DROP
+ /sbin/iptables -P FORWARD DROP
+ /sbin/iptables -P OUTPUT ACCEPT
+
+ # Empty LOG_DROP and LOG_REJECT chains
+ /sbin/iptables -N LOG_DROP
+ /sbin/iptables -A LOG_DROP -m limit --limit 10/minute -j LOG
+ /sbin/iptables -A LOG_DROP -j DROP
+ /sbin/iptables -N LOG_REJECT
+ /sbin/iptables -A LOG_REJECT -m limit --limit 10/minute -j LOG
+ /sbin/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)
+ /sbin/iptables -N PSCAN
+ /sbin/iptables -A PSCAN -p tcp -m limit --limit 10/minute -j LOG --log-prefix "TCP Scan? "
+ /sbin/iptables -A PSCAN -p udp -m limit --limit 10/minute -j LOG --log-prefix "UDP Scan? "
+ /sbin/iptables -A PSCAN -p icmp -m limit --limit 10/minute -j LOG --log-prefix "ICMP Scan? "
+ /sbin/iptables -A PSCAN -f -m limit --limit 10/minute -j LOG --log-prefix "FRAG Scan? "
+ /sbin/iptables -A PSCAN -j DROP
+
+ # 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
+ /sbin/iptables -N NEWNOTSYN
+ /sbin/iptables -A NEWNOTSYN -m limit --limit 10/minute -j LOG --log-prefix "NEW not SYN? "
+ /sbin/iptables -A NEWNOTSYN -j DROP
+
+ # Chain to contain all the rules relating to bad TCP flags
+ /sbin/iptables -N BADTCP
+
+ # Disallow packets frequently used by port-scanners
+ # nmap xmas
+ /sbin/iptables -A BADTCP -p tcp --tcp-flags ALL FIN,URG,PSH -j PSCAN
+ # Null
+ /sbin/iptables -A BADTCP -p tcp --tcp-flags ALL NONE -j PSCAN
+ # FIN
+ /sbin/iptables -A BADTCP -p tcp --tcp-flags ALL FIN -j PSCAN
+ # SYN/RST (also catches xmas variants that set SYN+RST+...)
+ /sbin/iptables -A BADTCP -p tcp --tcp-flags SYN,RST SYN,RST -j PSCAN
+ # SYN/FIN (QueSO or nmap OS probe)
+ /sbin/iptables -A BADTCP -p tcp --tcp-flags SYN,FIN SYN,FIN -j PSCAN
+ # NEW TCP without SYN
+ /sbin/iptables -A BADTCP -p tcp ! --syn -m state --state NEW -j NEWNOTSYN
+
+ /sbin/iptables -A INPUT -j BADTCP
+ /sbin/iptables -A FORWARD -j BADTCP
+
+}
+
+iptables_red() {
+ /sbin/iptables -F REDINPUT
+ /sbin/iptables -F REDFORWARD
+ /sbin/iptables -t nat -F REDNAT
+
+ # PPPoE / PPTP Device
+ if [ "$IFACE" != "" ]; then
+ # PPPoE / PPTP
+ if [ "$DEVICE" != "" ]; then
+ /sbin/iptables -A REDINPUT -i $DEVICE -j ACCEPT
+ fi
+ if [ "$RED_TYPE" == "PPTP" -o "$RED_TYPE" == "PPPOE" ]; then
+ if [ "$RED_DEV" != "" ]; then
+ /sbin/iptables -A REDINPUT -i $RED_DEV -j ACCEPT
+ fi
+ fi
+ fi
+
+ # PPTP over DHCP
+ if [ "$DEVICE" != "" -a "$TYPE" == "PPTP" -a "$METHOD" == "DHCP" ]; then
+ /sbin/iptables -A REDINPUT -p tcp --source-port 67 --destination-port 68 -i $DEVICE -j ACCEPT
+ /sbin/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
+ /sbin/iptables -A REDFORWARD -i $ORANGE_DEV -p tcp -o $IFACE -j ACCEPT
+ /sbin/iptables -A REDFORWARD -i $ORANGE_DEV -p udp -o $IFACE -j ACCEPT
+ fi
+ fi
+
+ if [ "$IFACE" != "" -a -f CONFIG_ROOT/red/active ]; then
+ # DHCP
+ if [ "$RED_DEV" != "" -a "$RED_TYPE" == "DHCP" ]; then
+ /sbin/iptables -A REDINPUT -p tcp --source-port 67 --destination-port 68 -i $IFACE -j ACCEPT
+ /sbin/iptables -A REDINPUT -p udp --source-port 67 --destination-port 68 -i $IFACE -j ACCEPT
+ fi
+ if [ "$METHOD" == "DHCP" -a "$PROTOCOL" == "RFC1483" ]; then
+ /sbin/iptables -A REDINPUT -p tcp --source-port 67 --destination-port 68 -i $IFACE -j ACCEPT
+ /sbin/iptables -A REDINPUT -p udp --source-port 67 --destination-port 68 -i $IFACE -j ACCEPT
+ fi
+
+ # Outgoing masquerading
+ /sbin/iptables -t nat -A REDNAT -o $IFACE -j MASQUERADE
+
+ fi
+}
+
+# See how we were called.
+case "$1" in
+ start)
+ iptables_init
+
+ # Limit Packets- helps reduce dos/syn attacks
+ # original do nothing line
+ #/sbin/iptables -A INPUT -p tcp -m tcp --tcp-flags SYN,RST,ACK SYN -m limit --limit 10/sec
+ # the correct one, but the negative '!' do nothing...
+ #/sbin/iptables -A INPUT -p tcp -m tcp --tcp-flags SYN,RST,ACK SYN -m limit ! --limit 10/sec -j DROP
+
+ # Fix for braindead ISP's
+ /sbin/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
+ /sbin/iptables -N CUSTOMINPUT
+ /sbin/iptables -A INPUT -j CUSTOMINPUT
+ /sbin/iptables -N CUSTOMFORWARD
+ /sbin/iptables -A FORWARD -j CUSTOMFORWARD
+ /sbin/iptables -N CUSTOMOUTPUT
+ /sbin/iptables -A OUTPUT -j CUSTOMOUTPUT
+ /sbin/iptables -t nat -N CUSTOMPREROUTING
+ /sbin/iptables -t nat -A PREROUTING -j CUSTOMPREROUTING
+ /sbin/iptables -t nat -N CUSTOMPOSTROUTING
+ /sbin/iptables -t nat -A POSTROUTING -j CUSTOMPOSTROUTING
+
+ # filtering from GUI
+ /sbin/iptables -N GUIINPUT
+ /sbin/iptables -A INPUT -j GUIINPUT
+
+ # Accept everything connected
+ /sbin/iptables -A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT
+ /sbin/iptables -A FORWARD -m state --state ESTABLISHED,RELATED -j ACCEPT
+
+ # localhost and ethernet.
+ /sbin/iptables -A INPUT -i lo -m state --state NEW -j ACCEPT
+ /sbin/iptables -A INPUT -s 127.0.0.0/8 -m state --state NEW -j DROP # Loopback not on lo
+ /sbin/iptables -A INPUT -d 127.0.0.0/8 -m state --state NEW -j DROP
+ /sbin/iptables -A FORWARD -i lo -m state --state NEW -j ACCEPT
+ /sbin/iptables -A FORWARD -s 127.0.0.0/8 -m state --state NEW -j DROP
+ /sbin/iptables -A FORWARD -d 127.0.0.0/8 -m state --state NEW -j DROP
+ /sbin/iptables -A INPUT -i $GREEN_DEV -m state --state NEW -j ACCEPT -p ! icmp
+ /sbin/iptables -A FORWARD -i $GREEN_DEV -m state --state NEW -j ACCEPT
+
+ # If a host on orange tries to initiate a connection to IPCop's red IP and
+ # the connection gets DNATed back through a port forward to a server on orange
+ # we end up with orange -> orange traffic passing through IPCop
+ [ "$ORANGE_DEV" != "" ] && /sbin/iptables -A FORWARD -i $ORANGE_DEV -o $ORANGE_DEV -m state --state NEW -j ACCEPT
+
+ # accept all traffic from ipsec interfaces
+ /sbin/iptables -A INPUT -i ipsec+ -j ACCEPT
+ /sbin/iptables -A FORWARD -i ipsec+ -j ACCEPT
+
+ # allow DHCP on BLUE to be turned on/off
+ /sbin/iptables -N DHCPBLUEINPUT
+ /sbin/iptables -A INPUT -j DHCPBLUEINPUT
+
+ # IPSec chains
+ /sbin/iptables -N IPSECRED
+ /sbin/iptables -A INPUT -j IPSECRED
+ /sbin/iptables -N IPSECBLUE
+ /sbin/iptables -A INPUT -j IPSECBLUE
+
+ # WIRELESS chains
+ /sbin/iptables -N WIRELESSINPUT
+ /sbin/iptables -A INPUT -m state --state NEW -j WIRELESSINPUT
+ /sbin/iptables -N WIRELESSFORWARD
+ /sbin/iptables -A FORWARD -m state --state NEW -j WIRELESSFORWARD
+
+ # RED chain, used for the red interface
+ /sbin/iptables -N REDINPUT
+ /sbin/iptables -A INPUT -j REDINPUT
+ /sbin/iptables -N REDFORWARD
+ /sbin/iptables -A FORWARD -j REDFORWARD
+ /sbin/iptables -t nat -N REDNAT
+ /sbin/iptables -t nat -A POSTROUTING -j REDNAT
+
+ iptables_red
+
+ # DMZ pinhole chain. setdmzholes setuid prog adds rules here to allow
+ # ORANGE to talk to GREEN / BLUE.
+ /sbin/iptables -N DMZHOLES
+ if [ "$ORANGE_DEV" != "" ]; then
+ /sbin/iptables -A FORWARD -i $ORANGE_DEV -m state --state NEW -j DMZHOLES
+ fi
+
+ # XTACCESS chain, used for external access
+ /sbin/iptables -N XTACCESS
+ /sbin/iptables -A INPUT -m state --state NEW -j XTACCESS
+
+ # PORTFWACCESS chain, used for portforwarding
+ /sbin/iptables -N PORTFWACCESS
+ /sbin/iptables -A FORWARD -m state --state NEW -j PORTFWACCESS
+
+ # Custom prerouting chains (for transparent proxy and port forwarding)
+ /sbin/iptables -t nat -N SQUID
+ /sbin/iptables -t nat -A PREROUTING -j SQUID
+ /sbin/iptables -t nat -N PORTFW
+ /sbin/iptables -t nat -A PREROUTING -j PORTFW
+
+
+ # Custom mangle chain (for port fowarding)
+ /sbin/iptables -t mangle -N PORTFWMANGLE
+ /sbin/iptables -t mangle -A PREROUTING -j PORTFWMANGLE
+
+ # Postrouting rules (for port forwarding)
+ /sbin/iptables -t nat -A POSTROUTING -m mark --mark 1 -j SNAT \
+ --to-source $GREEN_ADDRESS
+ if [ "$BLUE_DEV" != "" ]; then
+ /sbin/iptables -t nat -A POSTROUTING -m mark --mark 2 -j SNAT --to-source $BLUE_ADDRESS
+ fi
+ if [ "$ORANGE_DEV" != "" ]; then
+ /sbin/iptables -t nat -A POSTROUTING -m mark --mark 3 -j SNAT --to-source $ORANGE_ADDRESS
+ fi
+
+
+ # run local firewall configuration, if present
+ if [ -x /etc/rc.d/rc.firewall.local ]; then
+ /etc/rc.d/rc.firewall.local start
+ fi
+
+ # last rule in input and forward chain is for logging.
+ /sbin/iptables -A INPUT -m limit --limit 10/minute -j LOG --log-prefix "INPUT "
+ /sbin/iptables -A FORWARD -m limit --limit 10/minute -j LOG --log-prefix "OUTPUT "
+ ;;
+ stop)
+ iptables_init
+ # Accept everyting connected
+ /sbin/iptables -A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT
+
+ # localhost and ethernet.
+ /sbin/iptables -A INPUT -i lo -j ACCEPT
+ /sbin/iptables -A INPUT -i $GREEN_DEV -m state --state NEW -j ACCEPT
+
+ if [ "$RED_DEV" != "" -a "$RED_TYPE" == "DHCP" ]; then
+ /sbin/iptables -A INPUT -p tcp --source-port 67 --destination-port 68 -i $IFACE -j ACCEPT
+ /sbin/iptables -A INPUT -p udp --source-port 67 --destination-port 68 -i $IFACE -j ACCEPT
+ fi
+ if [ "$PROTOCOL" == "RFC1483" -a "$METHOD" == "DHCP" ]; then
+ /sbin/iptables -A INPUT -p tcp --source-port 67 --destination-port 68 -i $IFACE -j ACCEPT
+ /sbin/iptables -A INPUT -p udp --source-port 67 --destination-port 68 -i $IFACE -j ACCEPT
+ fi
+
+ # run local firewall configuration, if present
+ if [ -x /etc/rc.d/rc.firewall.local ]; then
+ /etc/rc.d/rc.firewall.local stop
+ fi
+
+ /sbin/iptables -A INPUT -m limit --limit 10/minute -j LOG --log-prefix "INPUT "
+ /sbin/iptables -A FORWARD -m limit --limit 10/minute -j LOG --log-prefix "OUTPUT "
+ ;;
+ reload)
+ iptables_red
+
+ # run local firewall configuration, if present
+ if [ -x /etc/rc.d/rc.firewall.local ]; then
+ /etc/rc.d/rc.firewall.local reload
+ fi
+ ;;
+ restart)
+ $0 stop
+ $0 start
+ ;;
+ *)
+ echo "Usage: $0 {start|stop|reload|restart}"
+ exit 1
+ ;;
+esac
+
+exit 0
projects / ipfire-2.x.git / blobdiff