the-infra/common/raito-proxy-aware-nginx.nix

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# This enables an IPv6-only server which is proxied by kurisu.lahfa.xyz to have proper IPv4 logs via PROXY protocol.
{ config, lib, ... }:
let
inherit (lib) mkEnableOption mkIf;
cfg = config.bagel.raito.v6-proxy-awareness;
allowedUpstream = "2001:bc8:38ee:99::1/128";
in
{
options.bagel.raito.v6-proxy-awareness.enable = mkEnableOption "the kurisu.lahfa.xyz's sniproxy awareness for NGINX";
config = mkIf cfg.enable {
services.nginx = {
# IPv6-only server
defaultListen = [
{ addr = "[::0]"; proxyProtocol = true; port = 444; ssl = true; }
{ addr = "[::0]"; port = 443; ssl = true; }
{ addr = "[::0]"; port = 80; ssl = false; }
# Private networking
{ addr = "127.0.0.1"; port = 80; ssl = false; }
{ addr = "[::1]"; port = 80; ssl = false; }
];
appendHttpConfig = ''
# Kurisu node
set_real_ip_from ${allowedUpstream};
real_ip_header proxy_protocol;
'';
};
# Move to nftables if firewall is enabled.
networking.nftables.enable = true;
networking.firewall.extraInputRules = ''
ip6 saddr ${allowedUpstream} tcp dport 444 accept
'';
};
}