Two independent fixes:
1. hashedPassword = "!" on the IPA user stub
Without any shadow entry, pam_unix returns PAM_AUTHINFO_UNAVAIL
before prompting, so PAM_AUTHTOK is never set. The "!" marker
(account locked, not a real hash) ensures a shadow entry exists so
pam_unix prompts and sets PAM_AUTHTOK — which the subsequent
pam_sss module can then use.
2. pam_sss try_first_pass instead of use_first_pass (login + su)
use_first_pass silently fails when PAM_AUTHTOK is unset.
try_first_pass prompts independently in that case, making IPA
password auth work even if pam_unix returns early for any reason.
Root cause found during incident: wayne (uid 50002) was outside IPA's
auto-SID range (163800000+), so sidgen never assigned him an
ipaNTSecurityIdentifier. Without it, ipadb's handle_authdata step fails
with "Generic error" after SPAKE pre-auth succeeds. Fixed by manually
adding objectClass: ipaNTUserAttrs + ipaNTSecurityIdentifier RID 550002
to wayne's LDAP entry on domain-controller. Any future IPA user with a
manually-assigned uid outside the auto-range needs the same treatment.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Documentation fixes:
- README/AGENTS: rename tailscale-exit-node → tailscale-router, add ha-server
build type and proxmox-ha-server-{1,2} host table rows, add baremetal to
platform list, remove references to non-existent flake-target-refactor-spec.md
and remove-sensetive-info-refactor.md
- docs/auto-installer.md: fix lxc-tailscale-exit-node → lxc-tailscale-router,
add pxe-minimal to the flake outputs list
- variables.nix: fix domainControllerIp comment — IPA is the authoritative DNS
at .253 (Pi-hole is gone), not a forwarding intermediary
Code deduplication:
- Extract duplicate SSH host-key preservation activation scripts from
modules/platforms/lxc.nix and modules/platforms/proxmox.nix into a shared
modules/common/preserve-ssh-host-key.nix; both platforms now import it
- Replace 8-line hand-enumerated NFS export lists in server.nix and ha-server.nix
with a mkNfsExports helper that generates exports from vars.nfsShares — adding
a share to variables.nix now propagates to both exporters automatically
Dead code removal:
- modules/common/configuration.nix: remove leftover NixOS skeleton comments
(hardware-configuration import, grub lines) that were never used
- modules/docker/enable-service.nix: remove commented-out listenOptions and
daemon.settings blocks
- hosts/server/host.nix, hosts/nix-cache/host.nix: remove #DOCKER_HOST comments
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Create an IPA group "docker-access" (GID 50010) and pin the local
"docker" group to that GID on all Docker hosts. Any IPA user in the
docker-access group automatically gains docker socket access through
SSSD supplementary-group resolution — no per-host docker.members
entry needed.
Specific changes:
- variables.nix: add dockerAccessGid = 50010
- modules/docker/enable-service.nix: lib.mkForce docker GID to
dockerAccessGid, removing the need to name individual IPA users
- modules/build-types/docker.nix: remove direct wayne docker.members
entry (access now comes from IPA group)
- modules/ipa/client.nix: refactor repeated security.* / systemd.*
top-level keys into merged attribute sets (fixes statix W20); add
security.pam.services.lightdm.makeHomeDir so the GUI login path
also creates the home dir on first login
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Grants the domain wayne account docker socket access on docker.sweet.home
without needing sudo, alongside the existing nixos local user membership.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
SSSD's dyndns_iface defaults to "*" which registers every interface's IP in
IPA DNS, including all Docker bridge networks (172.x.x.x). This caused
docker.sweet.home to resolve to Docker bridge IPs instead of 192.168.2.225.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
On first enrollment /home/wayne doesn't exist until the IPA user's first
login (pam_mkhomedir creates it). home-manager-<user>.service cd's into
the home dir immediately and fails with ENOENT, causing the whole rebuild
activation to return exit code 4.
Add ConditionPathExists so systemd skips the service (condition not met,
no failure) instead. After first login the dir exists and subsequent
rebuilds activate Home Manager normally.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Passing a FQDN like "nixos.sweet.home" instead of the short hostname
"nixos" caused the script to create a double-FQDN IPA host account
(nixos.sweet.home.sweet.home). Add an early check that rejects any
TARGET containing a dot.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
HM's useUserPackages creates a users.users stub for every configured HM
user, which lands wayne in /etc/passwd. NixOS adds pam_sss.so with the
"localusers" flag to the sudo PAM stack when SSSD is enabled; that flag
causes pam_sss to skip SSSD for any user found in local /etc/passwd,
falling through to pam_unix which has no shadow password for the stub.
Result: sudo auth always fails for the IPA user despite being in wheel.
Use NOPASSWD for the IPA user in sudoers instead. The IPA user already
authenticated to reach a shell (SSH key from IPA or Kerberos), so
re-prompting via a broken PAM path is security theater on a homelab.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
initgroups() uses NSS (groups: files sss) to build the supplemental
group list at login. Adding wheel to the local users.users stub means
the IPA user gets wheel membership from /etc/group, satisfying sudo's
group check.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Any enrolled host now automatically gets a Home Manager profile for the
IPA primary user (vars.ipaUser = "wayne"), covering what IPA doesn't:
dotfiles, user-scoped packages (tmux, sshfs), and EDITOR variable.
The home directory is pre-created by systemd-tmpfiles so HM activation
succeeds on steady-state systems before first login; pam_mkhomedir remains
as a fallback for fresh deploys where SSSD hasn't cached the user yet.
A minimal users.users stub satisfies NixOS's assertion requirements
(isNormalUser + group) that arise because home-manager.useUserPackages
creates a users.users entry to install packages to /etc/profiles/per-user/.
The stub is shadowed by SSSD at runtime (security.ipa sets passwd: sss files).
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
IPA users (e.g. wayne@) don't get Home Manager so the aliases defined in
aliases.nix were invisible to them. Move Switch-nix, Test-nix, and
buildImage into programs.bash in configuration.nix so every user on every
host gets them via /etc/bashrc. Stub out aliases.nix for future per-user
HM-only additions.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
The NixOS IPA module adds ConditionPathExists=/etc/krb5.keytab drop-ins
for auth-rpcgss-module.service and rpc-gssd.service via systemd.units.
In LXC containers with keytabs those conditions pass, the services start,
and then fail because auth_rpcgss can't be loaded and rpc_pipefs doesn't
exist in the container namespace.
Use lib.mkForce on our systemd.units text to win the conflict with NixOS's
existing definitions, and include ConditionVirtualization=!container
alongside the ConditionPathExists conditions so the services are skipped
(inactive, not failed) in containers that have a keytab.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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>
Script fixes:
- Rename HOSTNAME variable to TARGET (shadowed the bash builtin)
- Fix ipa-getkeytab -s to always use IPA_SERVER, not DC_HOST (diverge if
--dc is overridden to a jump host)
- Remove dead REALM variable
- Add EXIT trap to delete the plaintext keytab if the script aborts before
sops encryption completes; cleared after successful encrypt
- Distinguish real ipa host-add failures from "already exists" instead of
swallowing all errors with || true
- Warn explicitly when no platform age keys exist for the target (keytab
would be admin-only and the host couldn't decrypt it at boot)
- Fix sops fallback from pinned nixos-25.11 channel to nixpkgs (uses the
repo's own flake.lock)
- Expand "next steps" output to include networking.domain and nameservers
lines that host.nix requires for IPA membership
Module docs:
- Point to the script as the primary setup path; move manual steps to a
fallback section
- Note that certs/ipa-ca.crt is already committed (no need to re-fetch)
- Document the networking.domain and nameservers requirements in the header
- Add sync-host-keys.sh as explicit step 0
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
OpenSSH 10.0 tightened AuthorizedKeysCommand security by checking every
path component of the command binary for group/world-write permission.
/nix/store is 1775 (group-writable by nixbld), so sshd silently skips
the command for any binary in the Nix store — causing IPA pubkey auth to
silently fail with no diagnostic.
Fix: copy sss_ssh_authorizedkeys to /usr/local/bin via systemd tmpfiles
(C+ copies the file rather than symlinking, so the path at runtime is
root-owned/755 throughout), and point AuthorizedKeysCommand at the copy.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Imports docker/enable-service.nix and pins virtualisation.docker to
docker_29 via a nixpkgs overlay. Fixes indentation on `imports` block
and `programs.direnv.enable` line so nixpkgs-fmt passes.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
- security.pam.services.sshd.makeHomeDir: IPA users have no pre-created
home directory on the host; without this, sshd opens a session to a
missing directory and resets the connection immediately after auth
- AuthorizedKeysCommand was already added in previous commit
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
- modules/ipa/client.nix: add AuthorizedKeysCommand so sshd fetches SSH
public keys from IPA via sss_ssh_authorizedkeys, enabling pubkey login
without per-host authorized_keys files
- hosts/tailscale-router/host.nix: add IPA client module + networking.domain
so SSSD runs and wayne can authenticate on this host
- secrets/tailscale-router.keytab: sops-encrypted keytab for
tailscale-router.sweet.home (generated by create-nixos-ipa-host-account.sh)
- .sops.yaml: creation rule for secrets/tailscale-router.keytab
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
NixOS's dnsmasq module defaults resolveLocalQueries to true, which adds
127.0.0.1 to networking.nameservers and binds dnsmasq to listen-address=127.0.0.1.
This made the host route all its own DNS through dnsmasq, which had
no-resolv=true and no upstream for anything outside the tailnet domain —
so every non-tailscale DNS query from the host itself (including SSSD
resolving the IPA server FQDN after the IPA client module was added) failed.
Setting resolveLocalQueries=false limits dnsmasq to its intended role: a
forwarding proxy reachable on the LAN interface for IPA's conditional
forwarder. The host uses domainControllerIp directly (already set in
networking.nameservers in host.nix).
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
ipa-getkeytab runs as root via sudo so the temp file is root-owned;
scp as wayne gets Permission denied. Pipe through `sudo cat` over SSH
instead, which reads as root but writes locally as the invoking user.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Single command to enroll a NixOS host in FreeIPA and produce a
sops-encrypted keytab at secrets/<hostname>.keytab:
- Adds the .sops.yaml creation rule automatically (with all registered
platform-variant age keys as recipients)
- SSHes to the domain controller to run ipa host-add + ipa-getkeytab
- Refreshes the admin Kerberos ticket via `ssh -t ... kinit admin` if
missing or expired, so no manual kinit step is needed
- SCPs the keytab and encrypts it in-place with sops (file must be at
secrets/<hostname>.keytab before encryption so the path-based creation
rule matches — the common failure point when doing this manually)
Also adds HOME_DOMAIN and IPA_SERVER to scripts/env.sh, matching
variables.nix's homeDomain/ipaServer (same manual-sync pattern as
NIX_CACHE_HOST/LAN_DOMAIN).
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
beatzaplentyandClaude Sonnet 4.6