nixos/home/routing-common: Add dynamic DNS update script

nixos/boxes/britway/tailscale.nix

@@ -49,15 +49,19 @@ in
           noise.private_key_path = "/var/lib/headscale/noise_private.key";
           ip_prefixes = with lib.my.c.tailscale.prefix; [ v4 v6 ];
           dns_config = {
+            # Use IPs that will route inside the VPN to prevent interception
+            # (e.g. DNS rebinding filtering)
             restricted_nameservers = {
               "${domain}" = pubNameservers;
-              "${lib.my.c.colony.domain}" = with allAssignments.estuary.internal; [
+              "${lib.my.c.colony.domain}" = with allAssignments.estuary.base; [
                 ipv4.address ipv6.address
               ];
-              "${lib.my.c.home.domain}" = lib.my.c.home.routersPubV4 ++ ([
-                allAssignments.river.as211024.ipv6.address
-                allAssignments.stream.as211024.ipv6.address
-              ]);
+              "${lib.my.c.home.domain}" = with allAssignments; [
+                river.hi.ipv4.address
+                river.hi.ipv6.address
+                stream.hi.ipv4.address
+                stream.hi.ipv6.address
+              ];
             };
             magic_dns = true;
             base_domain = "ts.${pubDomain}";

nixos/boxes/colony/vms/estuary/dns.nix

@@ -52,7 +52,7 @@ in
           allowFrom = [
             "127.0.0.0/8" "::1/128"
             prefixes.all.v4 prefixes.all.v6
-          ];
+          ] ++ (with lib.my.c.tailscale.prefix; [ v4 v6 ]);
         };
 
         settings = {

nixos/boxes/home/routing-common/dns.nix

@@ -2,6 +2,7 @@ index: { lib, pkgs, config, assignments, allAssignments, ... }:
 let
   inherit (builtins) attrNames elemAt;
   inherit (lib.my) net;
+  inherit (lib.my.c) pubDomain;
   inherit (lib.my.c.home) prefixes vips routers;
 
   name = elemAt routers index;
@@ -22,6 +23,7 @@ in
           owner = "pdns-recursor";
           group = "pdns-recursor";
         };
+        "home/ddclient-cloudflare.key" = {};
       };
 
       pdns.recursor = {
@@ -42,7 +44,7 @@ in
             "127.0.0.0/8" "::1/128"
             prefixes.hi.v4 prefixes.hi.v6
             prefixes.lo.v4 prefixes.lo.v6
-          ];
+          ] ++ (with lib.my.c.tailscale.prefix; [ v4 v6 ]);
         };
 
         settings = {
@@ -63,9 +65,36 @@ in
       };
     };
 
-    systemd.services = {
+    systemd = {
+      services = {
         # Add AF_NETLINK to allow pulling IP from network interfaces
         pdns.serviceConfig.RestrictAddressFamilies = "AF_UNIX AF_INET AF_INET6 AF_NETLINK";
+        ddns-update = {
+          description = "DNS update script";
+          after = [ "network.target" ];
+          path = [
+            (pkgs.python3.withPackages (ps: [ ps.cloudflare ]))
+            pkgs.ldns
+          ];
+          serviceConfig = {
+            Type = "oneshot";
+            ExecStart =
+              ''${./dns_update.py} -k ${config.age.secrets."home/ddclient-cloudflare.key".path} '' +
+              ''${pubDomain} ns${toString (index + 1)}.${config.networking.domain}'';
+          };
+          wantedBy = [ "multi-user.target" ];
+        };
+      };
+      timers = {
+        ddns-update = {
+          description = "Periodically update DNS";
+          wantedBy = [ "timers.target" ];
+          timerConfig = {
+            OnBootSec = "5min";
+            OnUnitInactiveSec = "5min";
+          };
+        };
+      };
     };
 
     environment.systemPackages = with pkgs; [

nixos/boxes/home/routing-common/dns_update.py

@@ -0,0 +1,35 @@
+#!/usr/bin/env python3
+import argparse
+import subprocess
+
+import CloudFlare
+
+def main():
+    parser = argparse.ArgumentParser(description='Cloudflare DNS update script')
+    parser.add_argument('-k', '--api-token-file', help='Cloudflare API token file')
+    parser.add_argument('zone', help='Cloudflare Zone')
+    parser.add_argument('record', help='Cloudflare record name')
+    args = parser.parse_args()
+
+    address = subprocess.check_output(
+        ['drill', '-Q', '-p5353', '@127.0.0.1', args.record, 'A'],
+        encoding='utf8').strip()
+
+    cf_token = None
+    if args.api_token_file:
+        with open(args.api_token_file) as f:
+            cf_token = f.readline().strip()
+
+    cf = CloudFlare.CloudFlare(token=cf_token)
+    zones = cf.zones.get(params={'name': args.zone})
+    assert zones, f'Zone {args.zone} not found'
+    records = cf.zones.dns_records.get(zones[0]['id'], params={'name': args.record})
+    assert records, f'Record {args.record} not found in zone {args.zone}'
+
+    print(f'Updating {args.record} -> {address}')
+    cf.zones.dns_records.patch(
+        zones[0]['id'], records[0]['id'],
+        data={'type': 'A', 'name': args.record, 'content': address})
+
+if __name__ == '__main__':
+    main()

nixos/boxes/home/routing-common/kea.nix

@@ -55,7 +55,7 @@ in
             }
             {
               name = "domain-search";
-              data = "${domain}, dyn.${domain}";
+              data = "${domain}, dyn.${domain}, ${lib.my.c.colony.domain}, ${lib.my.c.britway.domain}";
               always-send = true;
             }
           ];

nixos/boxes/home/routing-common/radvd.nix

@@ -11,7 +11,7 @@ let
       AdvLinkMTU ${toString prefixes."${name}".mtu};
       prefix ${prefixes."${name}".v6} {};
       RDNSS ${net.cidr.host 1 prefixes."${name}".v6} ${net.cidr.host 2 prefixes."${name}".v6} {};
-      DNSSL ${domain} dyn.${domain} {};
+      DNSSL ${domain} dyn.${domain} ${lib.my.c.colony.domain} ${lib.my.c.britway.domain} {};
      };
   '';
 in

nixos/boxes/tower/default.nix

@@ -116,6 +116,10 @@
 
         programs = {
           steam.enable = true;
+          wireshark = {
+            enable = true;
+            package = pkgs.wireshark-qt;
+          };
         };
 
         networking = {
@@ -171,6 +175,14 @@
                 packages = with pkgs; [ ];
               };
 
+              programs = {
+                fish = {
+                  shellAbbrs = {
+                    tsup = "doas tailscale up --login-server=https://ts.nul.ie --accept-routes";
+                  };
+                };
+              };
+
               services = {
                 blueman-applet.enable = true;
               };

secrets/home/ddclient-cloudflare.key.age

@@ -0,0 +1,13 @@
+-----BEGIN AGE ENCRYPTED FILE-----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+-----END AGE ENCRYPTED FILE-----