ajout du firewall et fail2ban
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#!/usr/sbin/nftables -f
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flush ruleset
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# family `inet` c'est pour ipv4/ipv6
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table inet myfilter {
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chain myglobal {
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# par défaut on accepte tous les paquets entrant
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type filter hook input priority 0; policy accept;
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# accepte les ping (mais pas plus de 1 par seconde)
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ip protocol icmp icmp type { echo-request, echo-reply } limit rate 1/second accept
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ip protocol icmp icmp type { echo-request, echo-reply } drop
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ip6 nexthdr icmpv6 icmpv6 type { echo-request, echo-reply } limit rate 1/second accept
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ip6 nexthdr icmpv6 icmpv6 type { echo-request, echo-reply } drop
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# on accepte tout le reste du traffic icmp
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ip protocol icmp accept
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ip6 nexthdr icmpv6 accept
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# accepte le traffic qui vient de nous
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ct state established,related accept
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ct state invalid drop
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# accepte le traffic localhost
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iif lo accept
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# accepte tout le traffic ssh peut importe l'origine
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tcp dport 22 accept
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# abandonne le traffic depuis le réseau local
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ip saddr 10.0.0.0/8 drop
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ip6 saddr { fe80::/10, fc00::/7 } drop
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# accepte le traffic tcp depuis le reste du monde si la cible est un des ports http, https, smtp
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tcp dport {25, 80, 443} accept
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# count and drop any other traffic
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counter drop
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}
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}
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