88 lines
2.4 KiB
Text
Executable file
88 lines
2.4 KiB
Text
Executable file
#!/usr/sbin/nft -f
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flush ruleset
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table inet nat {
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chain prerouting {
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type nat hook prerouting priority dstnat;
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iif eth0 tcp dport {{ ports['syncthing_relaysrv'] }} redirect to :22067
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iif eth0 tcp dport 25 redirect to :{{ ports['mailserver_smtp'] }}
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iif eth0 tcp dport 465 redirect to :{{ ports['mailserver_smtps'] }}
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iif eth0 tcp dport 993 redirect to :{{ ports['mailserver_imaps'] }}
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}
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}
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table inet filter {
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set blackhole_ipv4 {
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type ipv4_addr
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timeout 30s
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flags dynamic
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}
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set blackhole_ipv6 {
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type ipv6_addr
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timeout 30s
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flags dynamic
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}
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chain input {
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type filter hook input priority 0; policy drop;
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iif lo accept
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# Block all IPs in blackhole
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ip saddr @blackhole_ipv4 set update ip saddr @blackhole_ipv4 drop
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ip6 saddr @blackhole_ipv6 set update ip6 saddr @blackhole_ipv6 drop
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ct state invalid drop
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ct state { established, related } accept
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# Prevent DDoS
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# Rate limiting
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meta nfproto ipv4 meter ratelimit4 \
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{ ip saddr limit rate over 75/second burst 15 packets } \
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add @blackhole_ipv4 { ip saddr }
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meta nfproto ipv6 meter ratelimit6 \
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{ ip6 saddr limit rate over 75/second burst 15 packets } \
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add @blackhole_ipv6 { ip6 saddr }
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# Max concurrent connections
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meta nfproto ipv4 meter connlimit4 \
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{ ip saddr ct count over 100 } add @blackhole_ipv4 { ip saddr }
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meta nfproto ipv6 meter connlimit6 \
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{ ip6 saddr ct count over 100 } add @blackhole_ipv6 { ip6 saddr }
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# Allow ICMP
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meta l4proto icmp accept
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meta l4proto ipv6-icmp accept
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# HTTP/S
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tcp dport { http, https } accept
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# SSH
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tcp dport ssh accept
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# SMTP/IMAP
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tcp dport { {{ ports['mailserver_smtp'] }}, {{ ports['mailserver_smtps'] }}, {{ ports['mailserver_imaps'] }} } accept
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# Syncthing
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tcp dport { {{ ports['syncthing_tcp'] }}, 22067 } accept
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udp dport {{ ports['syncthing_udp'] }} accept
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# Coturn
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tcp dport { {{ ports['coturn_listening'] }}, {{ ports['coturn_tls_listening'] }} } accept
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udp dport { {{ ports['coturn_listening'] }}, {{ ports['coturn_tls_listening'] }}, {{ ports['coturn_relay_min'] }}-{{ ports['coturn_relay_max'] }} } accept
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}
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chain forward {
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type filter hook forward priority 0; policy accept;
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}
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chain output {
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type filter hook output priority 0; policy accept;
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# Don't waste resources responding to blocked IPs
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ip daddr @blackhole_ipv4 reject
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ip6 daddr @blackhole_ipv6 reject
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}
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}
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