108 lines
4.5 KiB
Plaintext
108 lines
4.5 KiB
Plaintext
#!/usr/sbin/nft -f
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# Please replace ens33 to interface name of your device
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define int_if = ens33
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# If there are multiple net interface, example:
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# define int_if = {ens33, ens36}
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flush ruleset
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table ip filter {
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chain INPUT {
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type filter hook input priority 0; policy drop;
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iifname "lo" counter packets 0 bytes 0 accept
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ip saddr 127.0.0.0/8 counter packets 0 bytes 0 drop
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ip protocol tcp ct state established counter packets 0 bytes 0 accept
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ip protocol udp ct state established counter packets 0 bytes 0 accept
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ip protocol icmp ct state established counter packets 0 bytes 0 accept
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ip protocol icmp ct state related counter packets 0 bytes 0 accept
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limit rate 3/minute counter packets 0 bytes 0 log prefix "SFW2-IN-ILL-TARGET " flags tcp options flags ip options
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iifname $int_if tcp flags & (fin | syn | rst | ack) != syn ct state new limit rate 5/minute burst 7 packets counter packets 0 bytes 0 log prefix "Drop Syn"
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iifname $int_if tcp flags & (fin | syn | rst | ack) != syn ct state new counter packets 0 bytes 0 drop
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iifname $int_if ip frag-off & 8191 != 0 limit rate 5/minute burst 7 packets counter packets 0 bytes 0 log prefix "Fragments Packets"
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iifname $int_if ip frag-off & 8191 != 0 counter packets 0 bytes 0 drop
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iifname $int_if tcp flags & (fin | syn | rst | psh | ack | urg) == fin | psh | urg counter packets 0 bytes 0 drop
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iifname $int_if tcp flags & (fin | syn | rst | psh | ack | urg) == fin | syn | rst | psh | ack | urg counter packets 0 bytes 0 drop
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iifname $int_if tcp flags & (fin | syn | rst | psh | ack | urg) == 0x0 limit rate 5/minute burst 7 packets counter packets 0 bytes 0 log prefix "NULL Packets"
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iifname $int_if tcp flags & (fin | syn | rst | psh | ack | urg) == 0x0 counter packets 0 bytes 0 drop
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iifname $int_if tcp flags & (syn | rst) == syn | rst counter packets 0 bytes 0 drop
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iifname $int_if tcp flags & (fin | syn) == fin | syn limit rate 5/minute burst 7 packets counter packets 0 bytes 0 log prefix "XMAS Packets"
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iifname $int_if tcp flags & (fin | syn) == fin | syn counter packets 0 bytes 0 drop
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iifname $int_if tcp flags & (fin | ack) == fin limit rate 5/minute burst 7 packets counter packets 0 bytes 0 log prefix "Fin Packets Scan"
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iifname $int_if tcp flags & (fin | ack) == fin counter packets 0 bytes 0 drop
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iifname $int_if tcp flags & (fin | syn | rst | psh | ack | urg) == fin | syn | rst | ack | urg counter packets 0 bytes 0 drop
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iifname $int_if tcp dport 137-139 counter packets 0 bytes 0 reject
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iifname $int_if udp dport 137-139 counter packets 0 bytes 0 reject
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icmp type source-quench counter packets 0 bytes 0 accept
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tcp dport ssh ct state new counter packets 0 bytes 0 accept
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udp dport ntp ct state new counter packets 0 bytes 0 accept
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udp dport bootpc ct state new counter packets 0 bytes 0 accept
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tcp dport http ct state new counter packets 0 bytes 0 accept
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icmp type echo-request ct state established,related,new counter packets 0 bytes 0 accept
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counter packets 0 bytes 0 log
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counter packets 0 bytes 0 drop
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}
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chain FORWARD {
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type filter hook forward priority 0; policy drop;
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limit rate 3/minute counter packets 0 bytes 0 log prefix "SFW2-FWD-ILL-ROUTING " flags tcp options flags ip options
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counter packets 0 bytes 0 log
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}
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chain OUTPUT {
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type filter hook output priority 0; policy drop;
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oifname "lo" counter packets 0 bytes 0 accept
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ip protocol tcp ct state established,new counter packets 0 bytes 0 accept
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ip protocol udp ct state established,new counter packets 0 bytes 0 accept
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ip protocol icmp ct state established,new counter packets 0 bytes 0 accept
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icmp type echo-request counter packets 0 bytes 0 accept
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icmp type echo-reply ct state established,related counter packets 0 bytes 0 accept
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}
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chain LOGDROP {
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counter packets 0 bytes 0 log
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counter packets 0 bytes 0 drop
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}
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}
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table ip nat {
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chain PREROUTING {
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type nat hook prerouting priority -100; policy accept;
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}
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chain INPUT {
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type nat hook input priority 100; policy accept;
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}
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chain POSTROUTING {
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type nat hook postrouting priority 100; policy accept;
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}
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chain OUTPUT {
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type nat hook output priority -100; policy accept;
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}
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}
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table ip mangle {
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chain PREROUTING {
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type filter hook prerouting priority -150; policy accept;
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}
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chain INPUT {
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type filter hook input priority -150; policy accept;
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}
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chain FORWARD {
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type filter hook forward priority -150; policy accept;
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}
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chain OUTPUT {
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type route hook output priority -150; policy accept;
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}
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chain POSTROUTING {
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type filter hook postrouting priority -150; policy accept;
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}
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}
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