mirror of
https://github.com/vincentmli/bpfire.git
synced 2026-04-16 14:03:00 +02:00
5dba838282
Due to strange NFQUEUE behaviour, traffic to remote VPN (IPsec or OpenVPN) destinations was emitted to the internet (ppp0 or red0 interface) directly if the IPS was enabled but crashed during operation. This patch places the IPSECBLOCK and OVPNBLOCK chains before the ones responsible for forwarding traffic into the IPS. Thanks to Michael for his debugging effort. Partially fixes #12257 Cc: Michael Tremer <michael.tremer@ipfire.org> Cc: Stefan Schantl <stefan.schantl@ipfire.org> Signed-off-by: Peter Müller <peter.mueller@ipfire.org> Acked-by: Michael Tremer <michael.tremer@ipfire.org> Signed-off-by: Arne Fitzenreiter <arne_f@ipfire.org>
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/second -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/second -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 [ "$DROPPORTSCAN" == "on" ]; then
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iptables -A PSCAN -p tcp -m limit --limit 10/second -j LOG --log-prefix "DROP_TCP Scan " -m comment --comment "DROP_TCP PScan"
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iptables -A PSCAN -p udp -m limit --limit 10/second -j LOG --log-prefix "DROP_UDP Scan " -m comment --comment "DROP_UDP PScan"
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iptables -A PSCAN -p icmp -m limit --limit 10/second -j LOG --log-prefix "DROP_ICMP Scan " -m comment --comment "DROP_ICMP PScan"
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iptables -A PSCAN -f -m limit --limit 10/second -j LOG --log-prefix "DROP_FRAG Scan " -m comment --comment "DROP_FRAG PScan"
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fi
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iptables -A PSCAN -j DROP -m comment --comment "DROP_PScan"
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# New tcp packets without SYN set - could well be an obscure type of port scan
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# that's not covered above, may just be a broken windows machine
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iptables -N NEWNOTSYN
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if [ "$DROPNEWNOTSYN" == "on" ]; then
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iptables -A NEWNOTSYN -m limit --limit 10/second -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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# 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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# 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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# 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))
|
|
iptables -t nat -A REDNAT -m mark --mark 50 -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
|