516 lines
15 KiB
Bash
516 lines
15 KiB
Bash
#!/bin/sh
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. /etc/sysconfig/rc
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. ${rc_functions}
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eval $(/usr/local/bin/readhash /var/ipfire/ppp/settings)
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eval $(/usr/local/bin/readhash /var/ipfire/ethernet/settings)
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eval $(/usr/local/bin/readhash /var/ipfire/optionsfw/settings)
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IFACE=`/bin/cat /var/ipfire/red/iface 2> /dev/null | /usr/bin/tr -d '\012'`
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if [ -f /var/ipfire/red/device ]; then
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DEVICE=`/bin/cat /var/ipfire/red/device 2> /dev/null | /usr/bin/tr -d '\012'`
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fi
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function iptables() {
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/sbin/iptables --wait "$@"
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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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iptables -F
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iptables -t nat -F
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iptables -t mangle -F
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iptables -t raw -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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iptables -t raw -X
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# Set up policies
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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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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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iptables -N PSCAN
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if [ "$DROPPORTSCAN" == "on" ]; then
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iptables -A PSCAN -p tcp -m limit --limit 10/minute -j LOG --log-prefix "DROP_TCP Scan " -m comment --comment "DROP_TCP PScan"
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iptables -A PSCAN -p udp -m limit --limit 10/minute -j LOG --log-prefix "DROP_UDP Scan " -m comment --comment "DROP_UDP PScan"
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iptables -A PSCAN -p icmp -m limit --limit 10/minute -j LOG --log-prefix "DROP_ICMP Scan " -m comment --comment "DROP_ICMP PScan"
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iptables -A PSCAN -f -m limit --limit 10/minute -j LOG --log-prefix "DROP_FRAG Scan " -m comment --comment "DROP_FRAG PScan"
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fi
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iptables -A PSCAN -j DROP -m comment --comment "DROP_PScan"
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# New tcp packets without SYN set - could well be an obscure type of port scan
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# that's not covered above, may just be a broken windows machine
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iptables -N NEWNOTSYN
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if [ "$DROPNEWNOTSYN" == "on" ]; then
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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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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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iptables -N BADTCP
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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 FIN/URG/PSH (XMAS scan)
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iptables -A BADTCP -p tcp --tcp-flags ALL FIN,URG,PSH -j PSCAN
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# SYN/RST/ACK/FIN/URG
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iptables -A BADTCP -p tcp --tcp-flags ALL SYN,RST,ACK,FIN,URG -j PSCAN
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# ALL/ALL
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iptables -A BADTCP -p tcp --tcp-flags ALL ALL -j PSCAN
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# FIN Stealth
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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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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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iptables -A BADTCP -p tcp --tcp-flags SYN,FIN SYN,FIN -j PSCAN
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# Null
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iptables -A BADTCP -p tcp --tcp-flags ALL NONE -j PSCAN
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# NEW TCP without SYN
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iptables -A BADTCP -p tcp ! --syn -m conntrack --ctstate NEW -j NEWNOTSYN
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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 chains
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iptables -N CONNTRACK
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iptables -A CONNTRACK -m conntrack --ctstate ESTABLISHED -j ACCEPT
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iptables -A CONNTRACK -m conntrack --ctstate INVALID -j DROP
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iptables -A CONNTRACK -p icmp -m conntrack --ctstate RELATED -j ACCEPT
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iptables -t raw -N CONNTRACK
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iptables -t raw -A PREROUTING -j CONNTRACK
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# Conntrack helpers (https://home.regit.org/netfilter-en/secure-use-of-helpers/)
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# SIP
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if [ "${CONNTRACK_SIP}" = "on" ]; then
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modprobe nf_nat_sip
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iptables -A CONNTRACK -m conntrack --ctstate RELATED \
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-m helper --helper sip -j ACCEPT
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for proto in udp tcp; do
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iptables -t raw -A CONNTRACK -p "${proto}" --dport 5060 -j CT --helper sip
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done
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fi
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# H.323
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if [ "${CONNTRACK_H323}" = "on" ]; then
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modprobe nf_nat_h323
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iptables -A CONNTRACK -m conntrack --ctstate RELATED \
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-m helper --helper h323 -j ACCEPT
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# Gatekeeper RAS
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iptables -t raw -A CONNTRACK -p udp --dport 1719 -j CT --helper RAS
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# Q.931
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iptables -t raw -A CONNTRACK -p tcp --dport 1720 -j CT --helper Q.931
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fi
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# FTP
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if [ "${CONNTRACK_FTP}" = "on" ]; then
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modprobe nf_nat_ftp
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iptables -A CONNTRACK -m conntrack --ctstate RELATED \
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-m helper --helper ftp -p tcp --dport 1024: -j ACCEPT
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iptables -t raw -A CONNTRACK -p tcp --dport 21 -j CT --helper ftp
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fi
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# PPTP
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if [ "${CONNTRACK_PPTP}" = "on" ]; then
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modprobe nf_nat_pptp
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iptables -A CONNTRACK -m conntrack --ctstate RELATED \
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-m helper --helper pptp -j ACCEPT
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iptables -t raw -A CONNTRACK -p tcp --dport 1723 -j CT --helper pptp
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fi
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# TFTP
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if [ "${CONNTRACK_TFTP}" = "on" ]; then
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modprobe nf_nat_tftp
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iptables -A CONNTRACK -m conntrack --ctstate RELATED \
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-m helper --helper tftp -j ACCEPT
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iptables -t raw -A CONNTRACK -p udp --dport 69 -j CT --helper tftp
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fi
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# IRC
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if [ "${CONNTRACK_IRC}" = "on" ]; then
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modprobe nf_nat_irc
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iptables -A CONNTRACK -m conntrack --ctstate RELATED \
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-m helper --helper irc -j ACCEPT
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iptables -t raw -A CONNTRACK -p tcp --dport 6667 -j CT --helper irc
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fi
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# Amanda
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if [ "${CONNTRACK_AMANDA}" = "on" ]; then
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modprobe nf_nat_amanda
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iptables -A CONNTRACK -m conntrack --ctstate RELATED \
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-m helper --helper amanda -j ACCEPT
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iptables -t raw -A CONNTRACK -p tcp -j CT --helper amanda
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fi
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# Fix for braindead ISP's
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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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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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# P2PBLOCK
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iptables -N P2PBLOCK
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iptables -A INPUT -j P2PBLOCK
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iptables -A FORWARD -j P2PBLOCK
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iptables -A OUTPUT -j P2PBLOCK
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# Guardian (IPS) chains
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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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# IPS (suricata) chains
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iptables -N IPS_INPUT
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iptables -N IPS_FORWARD
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iptables -N IPS_OUTPUT
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iptables -A INPUT -j IPS_INPUT
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iptables -A FORWARD -j IPS_FORWARD
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iptables -A OUTPUT -j IPS_OUTPUT
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# Block non-established IPsec networks
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iptables -N IPSECBLOCK
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iptables -A FORWARD -m policy --dir out --pol none -j IPSECBLOCK
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iptables -A OUTPUT -m policy --dir out --pol none -j IPSECBLOCK
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# Block OpenVPN transfer networks
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iptables -N OVPNBLOCK
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iptables -A INPUT -i tun+ -j OVPNBLOCK
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iptables -A FORWARD -i tun+ -j OVPNBLOCK
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iptables -A FORWARD -o tun+ -j OVPNBLOCK
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# OpenVPN transfer network translation
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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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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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# Allow to ping the firewall.
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iptables -N ICMPINPUT
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iptables -A INPUT -j ICMPINPUT
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iptables -A ICMPINPUT -p icmp --icmp-type 8 -j ACCEPT
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# Accept everything on loopback
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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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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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iptables -A ${i} -j LOOPBACK
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done
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# Captive portal
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iptables -N CAPTIVE_PORTAL
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iptables -N CAPTIVE_PORTAL_CLIENTS
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for i in INPUT FORWARD; do
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iptables -A ${i} -j CAPTIVE_PORTAL
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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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iptables -A ${i} -j CONNTRACK
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done
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# Allow DHCP
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iptables -N DHCPINPUT
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iptables -A DHCPINPUT -p udp --sport 68 --dport 67 -j ACCEPT
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iptables -A DHCPINPUT -p tcp --sport 68 --dport 67 -j ACCEPT
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iptables -N DHCPOUTPUT
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iptables -A DHCPOUTPUT -p udp --sport 67 --dport 68 -j ACCEPT
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iptables -A DHCPOUTPUT -p tcp --sport 67 --dport 68 -j ACCEPT
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# Allow DHCP on GREEN
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iptables -N DHCPGREENINPUT
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iptables -N DHCPGREENOUTPUT
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if [ -n "${GREEN_DEV}" ]; then
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iptables -A INPUT -i "${GREEN_DEV}" -j DHCPGREENINPUT
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iptables -A OUTPUT -o "${GREEN_DEV}" -j DHCPGREENOUTPUT
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fi
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# allow DHCP on BLUE to be turned on/off
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iptables -N DHCPBLUEINPUT
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iptables -N DHCPBLUEOUTPUT
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if [ -n "${BLUE_DEV}" ]; then
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iptables -A INPUT -i "${BLUE_DEV}" -j DHCPBLUEINPUT
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iptables -A OUTPUT -o "${BLUE_DEV}" -j DHCPBLUEOUTPUT
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fi
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# GeoIP block
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iptables -N GEOIPBLOCK
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iptables -A INPUT -j GEOIPBLOCK
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iptables -A FORWARD -j GEOIPBLOCK
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# trafic from ipsecX/TUN/TAP interfaces, before "-i GREEN_DEV" accept everything
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iptables -N IPSECINPUT
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iptables -N IPSECFORWARD
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iptables -N IPSECOUTPUT
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iptables -A INPUT -j IPSECINPUT
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iptables -A FORWARD -j IPSECFORWARD
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iptables -A OUTPUT -j IPSECOUTPUT
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iptables -t nat -N IPSECNAT
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iptables -t nat -A POSTROUTING -j IPSECNAT
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# localhost and ethernet.
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# Always allow accessing the web GUI from GREEN.
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iptables -N GUIINPUT
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iptables -A INPUT -j GUIINPUT
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if [ -n "${GREEN_DEV}" ]; then
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iptables -A GUIINPUT -i "${GREEN_DEV}" -p tcp --dport 444 -j ACCEPT
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fi
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# WIRELESS chains
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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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iptables -N OVPNINPUT
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iptables -A INPUT -j OVPNINPUT
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# Tor (inbound and outbound)
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iptables -N TOR_INPUT
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iptables -A INPUT -j TOR_INPUT
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iptables -N TOR_OUTPUT
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iptables -A OUTPUT -j TOR_OUTPUT
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# Jump into the actual firewall ruleset.
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iptables -N INPUTFW
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iptables -A INPUT -j INPUTFW
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iptables -N OUTGOINGFW
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iptables -A OUTPUT -j OUTGOINGFW
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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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iptables -t nat -N NAT_SOURCE
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iptables -t nat -A POSTROUTING -j NAT_SOURCE
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# Captive Portal
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iptables -t nat -N CAPTIVE_PORTAL
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iptables -t nat -A PREROUTING -j CAPTIVE_PORTAL
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# Custom prerouting chains (for transparent proxy)
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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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iptables -t nat -N NAT_DESTINATION
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iptables -t nat -A PREROUTING -j NAT_DESTINATION
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iptables -t nat -A OUTPUT -j NAT_DESTINATION
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iptables -t mangle -N NAT_DESTINATION
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iptables -t mangle -A PREROUTING -j NAT_DESTINATION
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iptables -t nat -N NAT_DESTINATION_FIX
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iptables -t nat -A POSTROUTING -j NAT_DESTINATION_FIX
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if [ -n "${GREEN_ADDRESS}" ]; then
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iptables -t nat -A NAT_DESTINATION_FIX \
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-m mark --mark 1 -j SNAT --to-source "${GREEN_ADDRESS}"
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fi
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if [ -n "${BLUE_ADDRESS}" ]; then
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iptables -t nat -A NAT_DESTINATION_FIX \
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-m mark --mark 2 -j SNAT --to-source "${BLUE_ADDRESS}"
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fi
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if [ -n "${ORANGE_ADDRESS}" ]; then
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iptables -t nat -A NAT_DESTINATION_FIX \
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-m mark --mark 3 -j SNAT --to-source "${ORANGE_ADDRESS}"
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fi
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# upnp chain for our upnp daemon
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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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# RED chain, used for the red interface
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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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# Populate IPsec chains
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/usr/lib/firewall/ipsec-policy
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# Apply OpenVPN firewall rules
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/usr/local/bin/openvpnctrl --firewall-rules
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# run wirelessctrl
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/usr/local/bin/wirelessctrl
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# run captivectrl
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/usr/local/bin/captivectrl
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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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# Initialize firewall policies.
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/usr/sbin/firewall-policy
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# Install firewall rules for the red interface.
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iptables_red_up
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# If red has not been brought up yet, we will
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# add the blocking rules for MASQUERADE
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if [ ! -e "/var/ipfire/red/active" ]; then
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iptables_red_down
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fi
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}
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iptables_red_up() {
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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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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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iptables -A REDINPUT -i $RED_DEV -j ACCEPT
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fi
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fi
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fi
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# PPTP over DHCP
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if [ "$DEVICE" != "" -a "$TYPE" == "PPTP" -a "$METHOD" == "DHCP" ]; then
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iptables -A REDINPUT -p tcp --source-port 67 --destination-port 68 -i $DEVICE -j ACCEPT
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iptables -A REDINPUT -p udp --source-port 67 --destination-port 68 -i $DEVICE -j ACCEPT
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fi
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if [ "$IFACE" != "" -a -f /var/ipfire/red/active ]; then
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# DHCP
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if [ "$RED_DEV" != "" -a "$RED_TYPE" == "DHCP" ]; then
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iptables -A REDINPUT -p tcp --source-port 67 --destination-port 68 -i $IFACE -j ACCEPT
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iptables -A REDINPUT -p udp --source-port 67 --destination-port 68 -i $IFACE -j ACCEPT
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fi
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if [ "$METHOD" == "DHCP" -a "$PROTOCOL" == "RFC1483" ]; then
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iptables -A REDINPUT -p tcp --source-port 67 --destination-port 68 -i $IFACE -j ACCEPT
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iptables -A REDINPUT -p udp --source-port 67 --destination-port 68 -i $IFACE -j ACCEPT
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fi
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# Outgoing masquerading (don't masqerade IPSEC (mark 50))
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iptables -t nat -A REDNAT -m mark --mark 50 -o $IFACE -j RETURN
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if [ "${IFACE}" = "${GREEN_DEV}" ]; then
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iptables -t nat -A REDNAT -i "${GREEN_DEV}" -o "${IFACE}" -j RETURN
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fi
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local NO_MASQ_NETWORKS
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if [ "${MASQUERADE_GREEN}" = "off" ]; then
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NO_MASQ_NETWORKS="${NO_MASQ_NETWORKS} ${GREEN_NETADDRESS}/${GREEN_NETMASK}"
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fi
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|
|
|
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
|