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61 lines
2.4 KiB
Nix
61 lines
2.4 KiB
Nix
{ lib, myvars, ... }:
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let
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inherit (myvars.networking) lanCidr;
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# The host that scrapes the exporters (VictoriaMetrics runs on youko).
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monitoringHost = myvars.networking.hostsAddr.youko.ipv4;
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in
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{
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# Hosts bring their own firewall as defence in depth behind the router's
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# (which stays on, with port mappings for the few ports we need): the home
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# LAN and the tailnet are trusted equally (tighten the tailnet with Tailscale
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# ACLs), and everything else is denied on both address families.
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networking.nftables.enable = true;
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networking.firewall = {
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enable = true;
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# Nothing is opened to the Internet except Tailscale's WireGuard port
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# below. LAN/tailnet/local-container access comes from the rules below;
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# per-service `openFirewall` ports are suppressed.
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allowedTCPPorts = lib.mkForce [ ];
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allowedUDPPorts = lib.mkForce [ ];
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extraInputRules = ''
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# node_exporter is scraped only by the monitoring host, not the whole
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# LAN/tailnet/local containers.
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ip saddr != ${monitoringHost} tcp dport 9100 drop
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# The NVIDIA GPU exporter (desktop only) is likewise scraped only by the
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# monitoring host.
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ip saddr != ${monitoringHost} tcp dport 9835 drop
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# smartctl_exporter (drive/SSD SMART health) is scraped only by the
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# monitoring host.
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ip saddr != ${monitoringHost} tcp dport 9633 drop
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# Monitoring uses the stable IPv4 address above. Deny IPv6 exporter
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# connections before broad LAN/tailnet/container trust can accept them;
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# this does not restrict other IPv6 services or loopback access.
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meta nfproto ipv6 tcp dport { 9100, 9835, 9633 } drop
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# VNC consoles (libvirt on the VM hosts, and x11vnc inside the guests)
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# are never exposed to the LAN, tailnet, or containers: reach them
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# through an SSH tunnel. Loopback is accepted by the firewall's own rule.
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tcp dport { 5900, 5901, 5902, 5903, 5910 } drop
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# The local container bridge and the tailnet have the same access as the
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# LAN. Kept after the drop above so neither can reach node_exporter.
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iifname "podman0" accept
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iifname "tailscale0" accept
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# The home LAN is the trusted core.
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ip saddr ${lanCidr} accept
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ip6 saddr fe80::/10 accept
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# Tailscale's WireGuard port, for direct (non-DERP) connections. The LAN
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# and tailnet are accepted above, so this is the only port open to the
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# Internet.
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udp dport 41641 accept
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'';
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};
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}
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