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feat: can let each machiene add teh forwards it needs

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silver 2023-01-15 13:32:18 +00:00
parent a07bc6774c
commit c819214902
1 changed files with 73 additions and 55 deletions
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128
applications/firewall.nix
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@ -1,73 +1,91 @@
{
{lib, config, ...}:{
networking.firewall.enable = false;
networking.nftables.enable = true;
# using https://github.com/greaka/ops/blob/818be4c4dea9129abe0f086d738df4cb0bb38288/apps/restic/options.nix as a base
options = {
firewall_forward = lib.mkOption {
default = [ ];
type = lib.types.listOf lib.types.str;
description = ''
A list of routes to forward
'';
};
};
# 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 ip nat {
chain prerouting {
type nat hook prerouting priority dstnat; policy accept;
config = {
# disable default firewall to enable nftables
networking.firewall.enable = false;
networking.nftables.enable = true;
# forward anything with port 2222 to this specific ip
# tcp dport 2222 counter packets 0 bytes 0 dnat to 193.1.99.76:22
# 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 ip nat {
chain prerouting {
type nat hook prerouting priority dstnat; policy accept;
# 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
}
# forward anything with port 2222 to this specific ip
# tcp dport 2222 counter packets 0 bytes 0 dnat to 193.1.99.76:22
chain postrouting {
type nat hook postrouting priority srcnat; policy accept;
# 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
}
# the internal network
ip saddr 172.20.20.0/23 counter packets 0 bytes 0 masquerade
}
chain postrouting {
type nat hook postrouting priority srcnat; policy accept;
chain output {
type nat hook output priority -100; policy accept;
}
}
# the internal network
ip saddr 172.20.20.0/23 counter packets 0 bytes 0 masquerade
}
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 output {
type nat hook output priority -100; policy accept;
}
}
chain forward {
type filter hook forward priority filter; policy drop;
counter packets 0 bytes 0 jump rejects
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
}
# accept these ip/ports
# ip saddr 193.1.99.123 tcp dport 443 counter packets 0 bytes 0 accept
chain forward {
type filter hook forward priority filter; policy drop;
counter packets 0 bytes 0 jump rejects
counter packets 0 bytes 0 reject with icmp type admin-prohibited
}
# accept these ip/ports
# ip saddr 193.1.99.123 tcp dport 443 counter packets 0 bytes 0 accept
chain output {
type filter hook output priority filter; policy accept;
# can basically make each machiene responsibile for their own forwarding (in config at least)
${lib.strings.concatMapStrings (x: x + "\n") config.firewall_forward}
# no outgoing limits (for now)
}
counter packets 0 bytes 0 reject with icmp type admin-prohibited
}
chain fail2ban-ssh {
# ban these
# ip saddr 104.236.151.120 counter packets 0 bytes 0 drop
counter packets 0 bytes 0 return
}
chain output {
type filter hook output priority filter; policy accept;
chain rejects {
# Reject all these
# ip saddr 220.119.33.251 counter packets 0 bytes 0 reject with icmp type admin-prohibited
}
}
'';
# 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
}
}
'';
};
}