refactor(ipa): move FreeIPA client to common config with auto-enrollment

modules/ipa/client.nix is now a self-contained NixOS module (no longer a
parameterized function): it checks builtins.pathExists for
secrets/<hostname>.keytab at eval time and enables itself automatically if
found, making it a no-op for hosts without a keytab.

modules/common/configuration.nix imports it so every host in the flake is
a candidate for IPA enrollment — no per-host wiring needed. Adding a
keytab (via scripts/ipa/create-nixos-ipa-host-account.sh) is now the
only step required to enroll a host.

The module also sets networking.domain and networking.nameservers via
mkDefault when active, so new hosts don't need those set explicitly.

Also:
- Remove explicit IPA imports from hosts/nix-cache and hosts/tailscale-router
- Add secrets/pxe-boot.keytab + creation rule; remove incorrect
  secrets/nixos.sweet.home.keytab and its creation rule
- Add .sops.yaml creation rules for all remaining host keytabs
  (server, docker, tor-relay, nix-minimal, nixos) so the creation script
  can target them without manual .sops.yaml edits
- Fix duplicate tailscale-router.keytab rule and corrupted gui.yaml comment
  block in .sops.yaml

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

.sops.yaml

@@ -63,16 +63,6 @@ creation_rules:
           - *lxc-nix-cache
           - *proxmox-nix-cache
 
-  # Host keytab for nix-cache FreeIPA enrollment (binary sops file).
-  # Generate with: sops -e --input-type binary /tmp/nix-cache.keytab > secrets/nix-cache.keytab
-  - path_regex: secrets/nix-cache\.keytab$
-    key_groups:
-      - age:
-          - *admin
-          - *linode-nix-cache
-          - *lxc-nix-cache
-          - *proxmox-nix-cache
-
   - path_regex: secrets/server\.yaml$
     key_groups:
       - age:
@@ -127,16 +117,6 @@ creation_rules:
   # scripts/secrets/sync-host-keys.sh yet, so whichever variant is actually
   # deployed next needs its recipient added here (and `sops updatekeys` rerun)
   # before it can decrypt this.
-  # Host keytab for tailscale-router FreeIPA enrollment (binary sops file).
-  # Generated by scripts/ipa/create-nixos-ipa-host-account.sh.
-  - path_regex: secrets/tailscale-router\.keytab$
-    key_groups:
-      - age:
-          - *admin
-          - *lxc-tailscale-router
-          - *proxmox-tailscale-router
-          - *linode-tailscale-router
-
   - path_regex: secrets/gui\.yaml$
     key_groups:
       - age:
@@ -146,11 +126,72 @@ creation_rules:
           - *linode-gui
           - *proxmox-gui
 
-  # Host keytab for pxe-boot FreeIPA enrollment (binary sops file).
-  # Generated by scripts/ipa/create-nixos-ipa-host-account.sh.
+  # IPA host keytabs (binary sops files).
+  # Each keytab is encrypted for all platform variants of that host so any
+  # deployed variant can decrypt it at boot. Run
+  # scripts/ipa/create-nixos-ipa-host-account.sh <hostname> to enroll a new
+  # host and produce the keytab; this section is updated by that script.
+
+  - path_regex: secrets/nix-cache\.keytab$
+    key_groups:
+      - age:
+          - *admin
+          - *linode-nix-cache
+          - *lxc-nix-cache
+          - *proxmox-nix-cache
+
+  - path_regex: secrets/tailscale-router\.keytab$
+    key_groups:
+      - age:
+          - *admin
+          - *linode-tailscale-router
+          - *lxc-tailscale-router
+          - *proxmox-tailscale-router
+
   - path_regex: secrets/pxe-boot\.keytab$
     key_groups:
       - age:
           - *admin
           - *lxc-pxe-boot
           - *proxmox-pxe-boot
+
+  # nixos = the workstation (hosts/nixos/host.nix). All gui platform variants
+  # share the hostname "nixos" and must be able to decrypt at boot.
+  - path_regex: secrets/nixos\.keytab$
+    key_groups:
+      - age:
+          - *admin
+          - *baremetal-gui
+          - *lxc-gui
+          - *proxmox-gui
+          - *linode-gui
+
+  - path_regex: secrets/server\.keytab$
+    key_groups:
+      - age:
+          - *admin
+          - *linode-server
+          - *lxc-server
+          - *proxmox-server
+
+  - path_regex: secrets/docker\.keytab$
+    key_groups:
+      - age:
+          - *admin
+          - *linode-docker
+          - *lxc-docker
+          - *proxmox-docker
+
+  - path_regex: secrets/tor-relay\.keytab$
+    key_groups:
+      - age:
+          - *admin
+          - *lxc-tor-relay
+
+  - path_regex: secrets/nix-minimal\.keytab$
+    key_groups:
+      - age:
+          - *admin
+          - *lxc-minimal
+          - *proxmox-minimal
+          - *linode-minimal

flake.lock

@@ -173,11 +173,11 @@
         ]
       },
       "locked": {
-        "lastModified": 1784350909,
-        "narHash": "sha256-ZWyzLbS1yKUTeFJLmdVuWNnHttL333/ldJbEE+KzCrM=",
+        "lastModified": 1785119570,
+        "narHash": "sha256-Rgs2xKnGLFWQscxUaXX07oyZeuMDOHEbqDOsgliLFGM=",
         "owner": "nix-community",
         "repo": "home-manager",
-        "rev": "4ce190229c73d44536caa7072f6308fb2d8feeb3",
+        "rev": "d4fd24667c8cbef124bb70a20380cab75ec8474d",
         "type": "github"
       },
       "original": {
@@ -259,11 +259,11 @@
     },
     "nixpkgs_2": {
       "locked": {
-        "lastModified": 1784432872,
-        "narHash": "sha256-n3gKTBIV4ZA5VQpUakffBe3KGu4+mhPoA34rrqS0GkA=",
+        "lastModified": 1785104993,
+        "narHash": "sha256-eKbrvPoAOFutbYMdbB3r5EQVmFxKv24iKqHPPUXA0gM=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "fd1462031fdee08f65fd0b4c6b64e22239a77870",
+        "rev": "8623c4c20aa4ca2f5fb81510d2944066c3fb0d96",
         "type": "github"
       },
       "original": {

hosts/nix-cache/host.nix

@@ -6,15 +6,10 @@
       name = "nix-cache";
       sopsFile = ../../secrets/nix-cache.yaml;
     })
-    (import ../../modules/ipa/client.nix {
-      keytabSopsFile = ../../secrets/nix-cache.keytab;
-      caCertFile = ../../certs/ipa-ca.crt;
-    })
   ];
 
   networking = {
     hostName = vars.nixCacheHost;
-    domain = vars.homeDomain;
     useDHCP = false;
     interfaces.${vars.lxcLanInterface}.ipv4.addresses = [{
       address = vars.nixCacheIp;

hosts/pxe-boot/host.nix

@@ -1,16 +1,8 @@
 { vars, ... }:
 
 {
-  imports = [
-    (import ../../modules/ipa/client.nix {
-      keytabSopsFile = ../../secrets/pxe-boot.keytab;
-      caCertFile     = ../../certs/ipa-ca.crt;
-    })
-  ];
-
   networking = {
     hostName = "pxe-boot";
-    domain   = vars.homeDomain;
     useDHCP = false;
     interfaces.${vars.lxcLanInterface}.ipv4.addresses = [{
       address = vars.pxeServerIp;

hosts/tailscale-router/host.nix

@@ -6,15 +6,10 @@
       name = "tailscale-router";
       sopsFile = ../../secrets/tailscale-router.yaml;
     })
-    (import ../../modules/ipa/client.nix {
-      keytabSopsFile = ../../secrets/tailscale-router.keytab;
-      caCertFile = ../../certs/ipa-ca.crt;
-    })
   ];
 
   networking = {
     hostName = "tailscale-router";
-    domain = vars.homeDomain;
     useDHCP = false;
     interfaces.${vars.lxcLanInterface}.ipv4.addresses = [{
       address = vars.tailscaleRouterIp;

modules/build-types/gui.nix

@@ -1,6 +1,17 @@
 { config, pkgs, lib, inputs, vars, ... }:
 
 {
+  imports = [
+    ../docker/enable-service.nix
+  ];
+
+  nixpkgs.overlays = [
+    (final: prev: {
+      docker = prev.docker_29;
+      docker_cli = prev.docker_29;
+    })
+  ];
+
   environment.systemPackages = with pkgs; [
     inputs.nixos-conf-editor.packages.${pkgs.stdenv.hostPlatform.system}.nixos-conf-editor
     nodejs
@@ -18,7 +29,7 @@
   ];
 
   boot.loader.grub.useOSProber = true;
-programs.direnv.enable = true;
+  programs.direnv.enable = true;
   services = {
     xserver = {
       enable = true;

modules/common/configuration.nix

@@ -6,6 +6,7 @@
       # Include the results of the hardware scan.
       #      ./hardware-configuration.nix
       ./set-locale.nix
+      ../ipa/client.nix
     ];
   # Use the GRUB 2 boot loader.
   # boot.loader.grub.enable = true;

modules/docker/enable-service.nix

@@ -1,4 +1,4 @@
-{ pkgs, ... }:
+{ pkgs, vars, ... }:
 
 {
   #  virtualisation.docker.enable = true;
@@ -15,7 +15,7 @@
     #    experimental = true;
     #  };
   };
-
+  users.users.${vars.primaryUser}.extraGroups = [ "docker" ];
   environment.systemPackages = with pkgs; [
     docker-compose
     docker-buildx

modules/ipa/client.nix

@@ -1,34 +1,15 @@
 # Fully declarative FreeIPA domain membership.
 #
-# Configures security.ipa (SSSD, Kerberos, PAM, NSSwitch) and places a
-# pre-provisioned host keytab via sops-nix so no imperative ipa-client-install
-# step is needed after deployment.
+# Imported by modules/common/configuration.nix — no per-host wiring needed.
+# Enables itself automatically on any host that has a sops-encrypted keytab
+# at secrets/<hostname>.keytab; is a no-op for all other hosts.
 #
-# Usage (in a host.nix imports list):
-#   (import ../../modules/ipa/client.nix {
-#     keytabSopsFile = ../../secrets/<hostname>.keytab;
-#     caCertFile     = ../../certs/ipa-ca.crt;  # already committed — do not re-fetch
-#   })
-#
-# The host.nix networking block must also set:
-#   networking.domain   = vars.homeDomain;         # needed for Kerberos FQDN
-#   networking.nameservers = [ vars.domainControllerIp ];  # IPA DNS
-#
-# One-time operator setup per host (do this BEFORE deploying):
-#
-#   0. Generate SSH host keys and the host's age key for sops:
-#        scripts/secrets/sync-host-keys.sh <flake-target>
-#      This must run before step 1 so the host age key is in .sops.yaml
-#      and the keytab can be encrypted for the host to read at boot.
-#
-#   1. Add the IPA host account and produce the sops-encrypted keytab:
-#        scripts/ipa/create-nixos-ipa-host-account.sh [--ip <addr>] <hostname>
-#      The script handles ipa host-add, ipa-getkeytab, .sops.yaml patching,
-#      and sops encryption in one step. See the script header for details.
-#
-#   2. Wire up the host (see "Usage" above), then deploy:
-#        nixos-rebuild switch  (or create-proxmox-resource.sh)
-#      No further manual enrollment steps are required after deployment.
+# To enroll a new host:
+#   0. scripts/secrets/sync-host-keys.sh <flake-target>
+#   1. scripts/ipa/create-nixos-ipa-host-account.sh [--ip <addr>] <hostname>
+#      (adds .sops.yaml rule, runs ipa host-add, encrypts keytab in one step)
+#   2. git add secrets/<hostname>.keytab .sops.yaml && git commit
+#   3. Deploy — no further steps required.
 #
 # Manual fallback (if the script isn't usable):
 #   a. On the FreeIPA server: ipa host-add <fqdn> [--ip-address=<ip>] --force
@@ -40,18 +21,23 @@
 #
 # vars dependencies: homeDomain, ipaServer, domainControllerIp
 
-{ keytabSopsFile, caCertFile }:
 { config, lib, pkgs, vars, ... }:
 
 let
+  keytabPath = ../../secrets + "/${config.networking.hostName}.keytab";
+  enabled = builtins.pathExists keytabPath;
+
   realm = lib.strings.toUpper vars.homeDomain;
   fqdn = "${config.networking.hostName}.${vars.homeDomain}";
   # "sweet.home" -> "dc=sweet,dc=home"
   basedn = lib.strings.concatMapStringsSep "," (c: "dc=${c}") (lib.strings.splitString "." vars.homeDomain);
   # security.ipa.certificate expects a derivation (package), not a raw path.
-  caCertPkg = pkgs.writeText "ipa-ca.crt" (builtins.readFile caCertFile);
+  caCertPkg = pkgs.writeText "ipa-ca.crt" (builtins.readFile ../../certs/ipa-ca.crt);
 in
-{
+lib.mkIf enabled {
+  networking.domain = lib.mkDefault vars.homeDomain;
+  networking.nameservers = lib.mkDefault [ vars.domainControllerIp ];
+
   security.ipa = {
     enable = true;
     domain = vars.homeDomain;
@@ -92,7 +78,7 @@ in
   # Placed at /etc/krb5.keytab before SSSD starts so the host authenticates
   # to IPA without running ipa-client-install.
   sops.secrets."ipa-host-keytab" = {
-    sopsFile = keytabSopsFile;
+    sopsFile = keytabPath;
     format = "binary";
     path = "/etc/krb5.keytab";
     owner = "root";

modules/tailscale/ts-dns-forwarder.nix

@@ -19,6 +19,14 @@
   # tailnet-specific subdomain (vars.tailnetDomain) instead.
   services.dnsmasq = {
     enable = true;
+    # NixOS's dnsmasq module defaults resolveLocalQueries to true, which adds
+    # 127.0.0.1 to networking.nameservers and makes dnsmasq bind to
+    # listen-address=127.0.0.1. This instance is not the host's local
+    # resolver — it only serves IPA's conditional forwarder for tailnet names.
+    # The host uses domainControllerIp directly (networking.nameservers in
+    # host.nix). Without this, all host DNS goes through dnsmasq, which has
+    # no upstream for general queries (no-resolv=true), breaking resolution.
+    resolveLocalQueries = false;
     settings = {
       # Listen only on the LAN interface — not tailscale0 or loopback.
       # bind-interfaces prevents dnsmasq from binding to 0.0.0.0 and