mirror of
https://github.com/vincentmli/bpfire.git
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firewall: Use --wait for every iptables call.
This commit is contained in:
Michael Tremer
@@ -9,201 +9,205 @@ if [ -f /var/ipfire/red/device ]; then
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DEVICE=`/bin/cat /var/ipfire/red/device 2> /dev/null | /usr/bin/tr -d '\012'`
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fi
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function iptables() {
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/sbin/iptables --wait "$@"
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}
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iptables_init() {
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# Flush all rules and delete all custom chains
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/sbin/iptables -F
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/sbin/iptables -t nat -F
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/sbin/iptables -t mangle -F
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/sbin/iptables -X
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/sbin/iptables -t nat -X
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/sbin/iptables -t mangle -X
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iptables -F
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iptables -t nat -F
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iptables -t mangle -F
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iptables -X
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iptables -t nat -X
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iptables -t mangle -X
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# Set up policies
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/sbin/iptables -P INPUT DROP
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/sbin/iptables -P FORWARD DROP
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/sbin/iptables -P OUTPUT ACCEPT
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iptables -P INPUT DROP
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iptables -P FORWARD DROP
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iptables -P OUTPUT ACCEPT
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# Empty LOG_DROP and LOG_REJECT chains
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/sbin/iptables -N LOG_DROP
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/sbin/iptables -A LOG_DROP -m limit --limit 10/minute -j LOG
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/sbin/iptables -A LOG_DROP -j DROP
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/sbin/iptables -N LOG_REJECT
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/sbin/iptables -A LOG_REJECT -m limit --limit 10/minute -j LOG
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/sbin/iptables -A LOG_REJECT -j REJECT
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iptables -N LOG_DROP
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iptables -A LOG_DROP -m limit --limit 10/minute -j LOG
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iptables -A LOG_DROP -j DROP
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iptables -N LOG_REJECT
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iptables -A LOG_REJECT -m limit --limit 10/minute -j LOG
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iptables -A LOG_REJECT -j REJECT
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# This chain will log, then DROPs packets with certain bad combinations
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# of flags might indicate a port-scan attempt (xmas, null, etc)
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/sbin/iptables -N PSCAN
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iptables -N PSCAN
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if [ "$DROPPORTSCAN" == "on" ]; then
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/sbin/iptables -A PSCAN -p tcp -m limit --limit 10/minute -j LOG --log-prefix "DROP_TCP Scan " -m comment --comment "DROP_TCP PScan"
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/sbin/iptables -A PSCAN -p udp -m limit --limit 10/minute -j LOG --log-prefix "DROP_UDP Scan " -m comment --comment "DROP_UDP PScan"
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/sbin/iptables -A PSCAN -p icmp -m limit --limit 10/minute -j LOG --log-prefix "DROP_ICMP Scan " -m comment --comment "DROP_ICMP PScan"
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/sbin/iptables -A PSCAN -f -m limit --limit 10/minute -j LOG --log-prefix "DROP_FRAG Scan " -m comment --comment "DROP_FRAG PScan"
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iptables -A PSCAN -p tcp -m limit --limit 10/minute -j LOG --log-prefix "DROP_TCP Scan " -m comment --comment "DROP_TCP PScan"
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iptables -A PSCAN -p udp -m limit --limit 10/minute -j LOG --log-prefix "DROP_UDP Scan " -m comment --comment "DROP_UDP PScan"
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iptables -A PSCAN -p icmp -m limit --limit 10/minute -j LOG --log-prefix "DROP_ICMP Scan " -m comment --comment "DROP_ICMP PScan"
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iptables -A PSCAN -f -m limit --limit 10/minute -j LOG --log-prefix "DROP_FRAG Scan " -m comment --comment "DROP_FRAG PScan"
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fi
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/sbin/iptables -A PSCAN -j DROP -m comment --comment "DROP_PScan"
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iptables -A PSCAN -j DROP -m comment --comment "DROP_PScan"
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# New tcp packets without SYN set - could well be an obscure type of port scan
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# that's not covered above, may just be a broken windows machine
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/sbin/iptables -N NEWNOTSYN
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iptables -N NEWNOTSYN
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if [ "$DROPNEWNOTSYN" == "on" ]; then
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/sbin/iptables -A NEWNOTSYN -m limit --limit 10/minute -j LOG --log-prefix "DROP_NEWNOTSYN "
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iptables -A NEWNOTSYN -m limit --limit 10/minute -j LOG --log-prefix "DROP_NEWNOTSYN "
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fi
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/sbin/iptables -A NEWNOTSYN -j DROP -m comment --comment "DROP_NEWNOTSYN"
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iptables -A NEWNOTSYN -j DROP -m comment --comment "DROP_NEWNOTSYN"
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# Chain to contain all the rules relating to bad TCP flags
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/sbin/iptables -N BADTCP
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iptables -N BADTCP
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#Don't check loopback
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/sbin/iptables -A BADTCP -i lo -j RETURN
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# Don't check loopback
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iptables -A BADTCP -i lo -j RETURN
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# Disallow packets frequently used by port-scanners
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# nmap xmas
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/sbin/iptables -A BADTCP -p tcp --tcp-flags ALL FIN,URG,PSH -j PSCAN
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iptables -A BADTCP -p tcp --tcp-flags ALL FIN,URG,PSH -j PSCAN
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# Null
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/sbin/iptables -A BADTCP -p tcp --tcp-flags ALL NONE -j PSCAN
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iptables -A BADTCP -p tcp --tcp-flags ALL NONE -j PSCAN
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# FIN
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/sbin/iptables -A BADTCP -p tcp --tcp-flags ALL FIN -j PSCAN
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iptables -A BADTCP -p tcp --tcp-flags ALL FIN -j PSCAN
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# SYN/RST (also catches xmas variants that set SYN+RST+...)
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/sbin/iptables -A BADTCP -p tcp --tcp-flags SYN,RST SYN,RST -j PSCAN
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iptables -A BADTCP -p tcp --tcp-flags SYN,RST SYN,RST -j PSCAN
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# SYN/FIN (QueSO or nmap OS probe)
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/sbin/iptables -A BADTCP -p tcp --tcp-flags SYN,FIN SYN,FIN -j PSCAN
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iptables -A BADTCP -p tcp --tcp-flags SYN,FIN SYN,FIN -j PSCAN
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# NEW TCP without SYN
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/sbin/iptables -A BADTCP -p tcp ! --syn -m conntrack --ctstate NEW -j NEWNOTSYN
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iptables -A BADTCP -p tcp ! --syn -m conntrack --ctstate NEW -j NEWNOTSYN
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/sbin/iptables -A INPUT -p tcp -j BADTCP
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/sbin/iptables -A FORWARD -p tcp -j BADTCP
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iptables -A INPUT -p tcp -j BADTCP
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iptables -A FORWARD -p tcp -j BADTCP
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# Connection tracking chain
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/sbin/iptables -N CONNTRACK
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/sbin/iptables -A CONNTRACK -m conntrack --ctstate ESTABLISHED,RELATED -j ACCEPT
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iptables -N CONNTRACK
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iptables -A CONNTRACK -m conntrack --ctstate ESTABLISHED,RELATED -j ACCEPT
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# Fix for braindead ISP's
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/sbin/iptables -A FORWARD -p tcp --tcp-flags SYN,RST SYN -j TCPMSS --clamp-mss-to-pmtu
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iptables -A FORWARD -p tcp --tcp-flags SYN,RST SYN -j TCPMSS --clamp-mss-to-pmtu
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# CUSTOM chains, can be used by the users themselves
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/sbin/iptables -N CUSTOMINPUT
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/sbin/iptables -A INPUT -j CUSTOMINPUT
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/sbin/iptables -N CUSTOMFORWARD
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/sbin/iptables -A FORWARD -j CUSTOMFORWARD
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/sbin/iptables -N CUSTOMOUTPUT
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/sbin/iptables -A OUTPUT -j CUSTOMOUTPUT
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/sbin/iptables -t nat -N CUSTOMPREROUTING
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/sbin/iptables -t nat -A PREROUTING -j CUSTOMPREROUTING
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/sbin/iptables -t nat -N CUSTOMPOSTROUTING
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/sbin/iptables -t nat -A POSTROUTING -j CUSTOMPOSTROUTING
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iptables -N CUSTOMINPUT
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iptables -A INPUT -j CUSTOMINPUT
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iptables -N CUSTOMFORWARD
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iptables -A FORWARD -j CUSTOMFORWARD
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iptables -N CUSTOMOUTPUT
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iptables -A OUTPUT -j CUSTOMOUTPUT
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iptables -t nat -N CUSTOMPREROUTING
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iptables -t nat -A PREROUTING -j CUSTOMPREROUTING
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iptables -t nat -N CUSTOMPOSTROUTING
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iptables -t nat -A POSTROUTING -j CUSTOMPOSTROUTING
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# Guardian (IPS) chains
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/sbin/iptables -N GUARDIAN
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/sbin/iptables -A INPUT -j GUARDIAN
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/sbin/iptables -A FORWARD -j GUARDIAN
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iptables -N GUARDIAN
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iptables -A INPUT -j GUARDIAN
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iptables -A FORWARD -j GUARDIAN
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# Block OpenVPN transfer networks
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/sbin/iptables -N OVPNBLOCK
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iptables -N OVPNBLOCK
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for i in INPUT FORWARD; do
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/sbin/iptables -A ${i} -j OVPNBLOCK
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iptables -A ${i} -j OVPNBLOCK
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done
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# OpenVPN transfer network translation
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/sbin/iptables -t nat -N OVPNNAT
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/sbin/iptables -t nat -A POSTROUTING -j OVPNNAT
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iptables -t nat -N OVPNNAT
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iptables -t nat -A POSTROUTING -j OVPNNAT
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# IPTV chains for IGMPPROXY
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/sbin/iptables -N IPTVINPUT
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/sbin/iptables -A INPUT -j IPTVINPUT
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/sbin/iptables -N IPTVFORWARD
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/sbin/iptables -A FORWARD -j IPTVFORWARD
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iptables -N IPTVINPUT
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iptables -A INPUT -j IPTVINPUT
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iptables -N IPTVFORWARD
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iptables -A FORWARD -j IPTVFORWARD
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# filtering from GUI
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/sbin/iptables -N GUIINPUT
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/sbin/iptables -A INPUT -j GUIINPUT
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/sbin/iptables -A GUIINPUT -p icmp --icmp-type 8 -j ACCEPT
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iptables -N GUIINPUT
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iptables -A INPUT -j GUIINPUT
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iptables -A GUIINPUT -p icmp --icmp-type 8 -j ACCEPT
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# Accept everything on loopback
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/sbin/iptables -N LOOPBACK
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/sbin/iptables -A LOOPBACK -i lo -j ACCEPT
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/sbin/iptables -A LOOPBACK -o lo -j ACCEPT
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iptables -N LOOPBACK
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iptables -A LOOPBACK -i lo -j ACCEPT
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iptables -A LOOPBACK -o lo -j ACCEPT
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# Filter all packets with loopback addresses on non-loopback interfaces.
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/sbin/iptables -A LOOPBACK -s 127.0.0.0/8 -j DROP
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/sbin/iptables -A LOOPBACK -d 127.0.0.0/8 -j DROP
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iptables -A LOOPBACK -s 127.0.0.0/8 -j DROP
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iptables -A LOOPBACK -d 127.0.0.0/8 -j DROP
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for i in INPUT FORWARD OUTPUT; do
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/sbin/iptables -A ${i} -j LOOPBACK
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iptables -A ${i} -j LOOPBACK
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done
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# Accept everything connected
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for i in INPUT FORWARD OUTPUT; do
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/sbin/iptables -A ${i} -j CONNTRACK
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iptables -A ${i} -j CONNTRACK
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done
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# trafic from ipsecX/TUN/TAP interfaces, before "-i GREEN_DEV" accept everything
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/sbin/iptables -N IPSECINPUT
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/sbin/iptables -N IPSECFORWARD
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/sbin/iptables -N IPSECOUTPUT
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/sbin/iptables -A INPUT -j IPSECINPUT
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/sbin/iptables -A FORWARD -j IPSECFORWARD
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/sbin/iptables -A OUTPUT -j IPSECOUTPUT
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/sbin/iptables -t nat -N IPSECNAT
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/sbin/iptables -t nat -A POSTROUTING -j IPSECNAT
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iptables -N IPSECINPUT
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iptables -N IPSECFORWARD
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iptables -N IPSECOUTPUT
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iptables -A INPUT -j IPSECINPUT
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iptables -A FORWARD -j IPSECFORWARD
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iptables -A OUTPUT -j IPSECOUTPUT
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iptables -t nat -N IPSECNAT
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iptables -t nat -A POSTROUTING -j IPSECNAT
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# localhost and ethernet.
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/sbin/iptables -A INPUT -i $GREEN_DEV -m conntrack --ctstate NEW -j ACCEPT ! -p icmp
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iptables -A INPUT -i $GREEN_DEV -m conntrack --ctstate NEW -j ACCEPT ! -p icmp
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# allow DHCP on BLUE to be turned on/off
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/sbin/iptables -N DHCPBLUEINPUT
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/sbin/iptables -A INPUT -j DHCPBLUEINPUT
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iptables -N DHCPBLUEINPUT
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iptables -A INPUT -j DHCPBLUEINPUT
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# WIRELESS chains
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/sbin/iptables -N WIRELESSINPUT
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/sbin/iptables -A INPUT -m conntrack --ctstate NEW -j WIRELESSINPUT
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/sbin/iptables -N WIRELESSFORWARD
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/sbin/iptables -A FORWARD -m conntrack --ctstate NEW -j WIRELESSFORWARD
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iptables -N WIRELESSINPUT
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iptables -A INPUT -m conntrack --ctstate NEW -j WIRELESSINPUT
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iptables -N WIRELESSFORWARD
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iptables -A FORWARD -m conntrack --ctstate NEW -j WIRELESSFORWARD
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# OpenVPN
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/sbin/iptables -N OVPNINPUT
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/sbin/iptables -A INPUT -j OVPNINPUT
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iptables -N OVPNINPUT
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iptables -A INPUT -j OVPNINPUT
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# TOR
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/sbin/iptables -N TOR_INPUT
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/sbin/iptables -A INPUT -j TOR_INPUT
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iptables -N TOR_INPUT
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iptables -A INPUT -j TOR_INPUT
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# Jump into the actual firewall ruleset.
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/sbin/iptables -N INPUTFW
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/sbin/iptables -A INPUT -j INPUTFW
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iptables -N INPUTFW
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iptables -A INPUT -j INPUTFW
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/sbin/iptables -N OUTGOINGFW
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/sbin/iptables -A OUTPUT -j OUTGOINGFW
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iptables -N OUTGOINGFW
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iptables -A OUTPUT -j OUTGOINGFW
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/sbin/iptables -N FORWARDFW
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/sbin/iptables -A FORWARD -j FORWARDFW
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iptables -N FORWARDFW
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iptables -A FORWARD -j FORWARDFW
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# SNAT rules
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/sbin/iptables -t nat -N NAT_SOURCE
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/sbin/iptables -t nat -A POSTROUTING -j NAT_SOURCE
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iptables -t nat -N NAT_SOURCE
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iptables -t nat -A POSTROUTING -j NAT_SOURCE
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# RED chain, used for the red interface
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/sbin/iptables -N REDINPUT
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/sbin/iptables -A INPUT -j REDINPUT
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/sbin/iptables -N REDFORWARD
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/sbin/iptables -A FORWARD -j REDFORWARD
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/sbin/iptables -t nat -N REDNAT
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/sbin/iptables -t nat -A POSTROUTING -j REDNAT
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iptables -N REDINPUT
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iptables -A INPUT -j REDINPUT
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iptables -N REDFORWARD
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iptables -A FORWARD -j REDFORWARD
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iptables -t nat -N REDNAT
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iptables -t nat -A POSTROUTING -j REDNAT
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iptables_red
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# Custom prerouting chains (for transparent proxy)
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/sbin/iptables -t nat -N SQUID
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/sbin/iptables -t nat -A PREROUTING -j SQUID
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iptables -t nat -N SQUID
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iptables -t nat -A PREROUTING -j SQUID
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# DNAT rules
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/sbin/iptables -t nat -N NAT_DESTINATION
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/sbin/iptables -t nat -A PREROUTING -j NAT_DESTINATION
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iptables -t nat -N NAT_DESTINATION
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iptables -t nat -A PREROUTING -j NAT_DESTINATION
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# upnp chain for our upnp daemon
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/sbin/iptables -t nat -N UPNPFW
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/sbin/iptables -t nat -A PREROUTING -j UPNPFW
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/sbin/iptables -N UPNPFW
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/sbin/iptables -A FORWARD -m conntrack --ctstate NEW -j UPNPFW
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iptables -t nat -N UPNPFW
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iptables -t nat -A PREROUTING -j UPNPFW
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iptables -N UPNPFW
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iptables -A FORWARD -m conntrack --ctstate NEW -j UPNPFW
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# run local firewall configuration, if present
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if [ -x /etc/sysconfig/firewall.local ]; then
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@@ -216,13 +220,13 @@ iptables_init() {
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# run wirelessctrl
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/usr/local/bin/wirelessctrl
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#POLICY CHAIN
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/sbin/iptables -N POLICYIN
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/sbin/iptables -A INPUT -j POLICYIN
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/sbin/iptables -N POLICYFWD
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/sbin/iptables -A FORWARD -j POLICYFWD
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/sbin/iptables -N POLICYOUT
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/sbin/iptables -A OUTPUT -j POLICYOUT
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# POLICY CHAIN
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iptables -N POLICYIN
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iptables -A INPUT -j POLICYIN
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iptables -N POLICYFWD
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iptables -A FORWARD -j POLICYFWD
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iptables -N POLICYOUT
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iptables -A OUTPUT -j POLICYOUT
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/usr/sbin/firewall-policy
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@@ -230,37 +234,37 @@ iptables_init() {
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/usr/local/bin/firewallctrl
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if [ "$DROPINPUT" == "on" ]; then
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/sbin/iptables -A INPUT -m limit --limit 10/minute -j LOG --log-prefix "DROP_INPUT"
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iptables -A INPUT -m limit --limit 10/minute -j LOG --log-prefix "DROP_INPUT"
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fi
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/sbin/iptables -A INPUT -j DROP -m comment --comment "DROP_INPUT"
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iptables -A INPUT -j DROP -m comment --comment "DROP_INPUT"
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if [ "$DROPFORWARD" == "on" ]; then
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/sbin/iptables -A FORWARD -m limit --limit 10/minute -j LOG --log-prefix "DROP_FORWARD"
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iptables -A FORWARD -m limit --limit 10/minute -j LOG --log-prefix "DROP_FORWARD"
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fi
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/sbin/iptables -A FORWARD -j DROP -m comment --comment "DROP_FORWARD"
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iptables -A FORWARD -j DROP -m comment --comment "DROP_FORWARD"
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}
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iptables_red() {
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/sbin/iptables -F REDINPUT
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/sbin/iptables -F REDFORWARD
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/sbin/iptables -t nat -F REDNAT
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iptables -F REDINPUT
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iptables -F REDFORWARD
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iptables -t nat -F REDNAT
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# PPPoE / PPTP Device
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if [ "$IFACE" != "" ]; then
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# PPPoE / PPTP
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if [ "$DEVICE" != "" ]; then
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/sbin/iptables -A REDINPUT -i $DEVICE -j ACCEPT
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iptables -A REDINPUT -i $DEVICE -j ACCEPT
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fi
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if [ "$RED_TYPE" == "PPTP" -o "$RED_TYPE" == "PPPOE" ]; then
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if [ "$RED_DEV" != "" ]; then
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/sbin/iptables -A REDINPUT -i $RED_DEV -j ACCEPT
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iptables -A REDINPUT -i $RED_DEV -j ACCEPT
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fi
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fi
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fi
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|
||||
# PPTP over DHCP
|
||||
if [ "$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
|
||||
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 $DEVICE -j ACCEPT
|
||||
fi
|
||||
|
||||
# Orange pinholes
|
||||
@@ -268,24 +272,24 @@ iptables_red() {
|
||||
# This rule enables a host on ORANGE network to connect to the outside
|
||||
# (only if we have a red connection)
|
||||
if [ "$IFACE" != "" ]; then
|
||||
/sbin/iptables -A REDFORWARD -i $ORANGE_DEV -o $IFACE -j ACCEPT
|
||||
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
|
||||
/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
|
||||
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
|
||||
/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
|
||||
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))
|
||||
/sbin/iptables -t nat -A REDNAT -m mark --mark 50 -o $IFACE -j RETURN
|
||||
/sbin/iptables -t nat -A REDNAT -o $IFACE -j MASQUERADE
|
||||
iptables -t nat -A REDNAT -m mark --mark 50 -o $IFACE -j RETURN
|
||||
iptables -t nat -A REDNAT -o $IFACE -j MASQUERADE
|
||||
|
||||
fi
|
||||
}
|
||||
|
||||
Reference in New Issue
Block a user