From 6f0c449648e8490bcb0f4afcef811058d43d5b7a Mon Sep 17 00:00:00 2001
From: Felix Albrigtsen <felixalbrigtsen@gmail.com>
Date: Tue, 26 Dec 2023 12:21:30 +0100
Subject: [PATCH] metrics: fix iptables rules

---
 common/metrics-exporters.nix  | 14 +++++++-------
 hosts/voyager/filesystems.nix | 12 ++++++++++--
 2 files changed, 17 insertions(+), 9 deletions(-)

diff --git a/common/metrics-exporters.nix b/common/metrics-exporters.nix
index 26a9b10..f1675b6 100644
--- a/common/metrics-exporters.nix
+++ b/common/metrics-exporters.nix
@@ -7,13 +7,13 @@
     enabledCollectors = [ "systemd" ];
   };
 
-  systemd.services.prometheus-node-exporter.serviceConfig = {
-    # TODO: Define allowed IPs
-    # IPAddressDeny = "any";
-    # IPAddressAllow = [
-    #   values.chapel.ipv4
-    #   values.chapel.ipv6
-    # ];
+  networking.firewall = {
+    # TODO: Move this into the node-exporter systemd service
+    allowedTCPPorts = [ 9100 ];
+    extraCommands = ''
+      iptables -A INPUT -p tcp -m tcp --source 192.168.10.175/32 --dport 9100 -j ACCEPT
+      iptables -A INPUT -p tcp -m tcp --dport 9100 -j DROP
+    '';
   };
 
   services.promtail = {
diff --git a/hosts/voyager/filesystems.nix b/hosts/voyager/filesystems.nix
index b51c9d7..c6a035e 100644
--- a/hosts/voyager/filesystems.nix
+++ b/hosts/voyager/filesystems.nix
@@ -13,8 +13,16 @@
   services.zfs.autoScrub.enable = true;
   services.prometheus.exporters.zfs = {
     enable = true;
-    openFirewall = true;
-    firewallFilter = "-p tcp -m tcp -s 192.168.10.175 --dport 9134"; # Only allow defiant
+    # "ip46" is cursed, do it manually below
+    # openFirewall = true;
+    # firewallFilter = "-p tcp -m tcp --source 192.168.10.175/32 --dport 9134";
+  };
+  networking.firewall = {
+    allowedTCPPorts = [ 9134 ];
+    extraCommands = ''
+      iptables -A INPUT -p tcp -m tcp --source 192.168.10.175/32 --dport 9134 -j ACCEPT
+      iptables -A INPUT -p tcp -m tcp --dport 9134 -j DROP
+    '';
   };
 
   # Network mounts (import)