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feat: basic firewall using the previous

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silver 2023-01-13 18:34:19 +00:00
parent 7963e3a9db
commit f1a484eaff
2 changed files with 59 additions and 37 deletions
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84
applications/firewall.nix
View file

@ -1,48 +1,70 @@
{
networking.firewall.enable = false;
networking.nftables.enable = true;
# fules for the
networking.nftables.ruleset = ''
# fules for the firewall
# beware of EOL conversion.
networking.nftables.ruleset =
''
# Check out https://wiki.nftables.org/ for better documentation.
# Table for both IPv4 and IPv6.
table inet filter {
# Block all incomming connections traffic except SSH and "ping".
chain input {
type filter hook input priority 0;
table ip nat {
chain prerouting {
type nat hook prerouting priority dstnat; policy accept;
# accept any localhost traffic
iifname lo accept
# forward anything with port 2222 to this specific ip
# tcp dport 2222 counter packets 0 bytes 0 dnat to 193.1.99.76:22
# accept traffic originated from us
ct state {established, related} accept
# ICMP
# routers may also want: mld-listener-query, nd-router-solicit
ip6 nexthdr icmpv6 icmpv6 type { destination-unreachable, packet-too-big, time-exceeded, parameter-problem, nd-router-advert, nd-neighbor-solicit, nd-neighbor-advert } accept
ip protocol icmp icmp type { destination-unreachable, router-advertisement, time-exceeded, parameter-problem } accept
# allow "ping"
ip6 nexthdr icmpv6 icmpv6 type echo-request accept
ip protocol icmp icmp type echo-request accept
# accept SSH connections (required for a server)
tcp dport 22 accept
# tcp dport 21 accept
# count and drop any other traffic
counter drop
# forward http/s traffic from 76 to 123
# ip daddr 193.1.99.76 tcp dport 80 counter packets 0 bytes 0 dnat to 193.1.99.123:80
# ip daddr 193.1.99.76 tcp dport 443 counter packets 0 bytes 0 dnat to 193.1.99.123:443
}
chain postrouting {
type nat hook postrouting priority srcnat; policy accept;
# the internal network
ip saddr 172.20.20.0/23 counter packets 0 bytes 0 masquerade
}
# Allow all outgoing connections.
chain output {
type filter hook output priority 0;
accept
type nat hook output priority -100; policy accept;
}
}
table ip filter {
chain input {
type filter hook input priority filter; policy accept;
tcp dport 22 counter packets 0 bytes 0 jump fail2ban-ssh
tcp dport 22 counter packets 0 bytes 0 accept
}
chain forward {
type filter hook forward priority 0;
accept
type filter hook forward priority filter; policy drop;
counter packets 0 bytes 0 jump rejects
# accept these ip/ports
# ip saddr 193.1.99.123 tcp dport 443 counter packets 0 bytes 0 accept
counter packets 0 bytes 0 reject with icmp type admin-prohibited
}
chain output {
type filter hook output priority filter; policy accept;
# no outgoing limits (for now)
}
chain fail2ban-ssh {
# ban these
# ip saddr 104.236.151.120 counter packets 0 bytes 0 drop
counter packets 0 bytes 0 return
}
chain rejects {
# Reject all these
# ip saddr 220.119.33.251 counter packets 0 bytes 0 reject with icmp type admin-prohibited
}
}
'';

2
machines/test01.nix
View file

@ -6,7 +6,7 @@
./base.nix
# applications for this particular server
./applications/firewall.nix
../applications/firewall.nix
];
environment.systemPackages = [