The homelab hosts accept root SSH with long-lived file keys, run several
exposed services with almost no systemd sandboxing, and keep no audit trail of
privileged actions. Close those three gaps, weighing each measure against its
cost instead of adopting a policy wholesale.
SSH
- Turn off KbdInteractiveAuthentication: nixpkgs defaults it to true and PAM
then still accepts the Unix password despite PasswordAuthentication = false.
- authorizedKeysInHomedir = false: only keys declared in Nix take effect;
youko keeps Gitea's forced-command file through `Match User gitea`.
- Pin aquamarine's passphrase-free remote-builder keys to
`restrict,command="nix-daemon --stdio --store daemon"`, so builds run in the
system daemon instead of an audited root login session.
systemd sandboxing
- Add the mylib.systemdHardening preset and apply it to the exposed, weakly
sandboxed services: caddy 7.8 -> 1.5, vmalert 8.2 -> 1.4, rustfs 6.6 -> 1.4,
whisper-asr 7.7 -> 1.6. An eval test pins the key restrictions.
- Rejected: a global all-keys policy (<=0.2 score gains on services nixpkgs
already sandboxes) and per-service confinement (bind paths to maintain).
auditd on all four hosts, reusing nixpkgs' loader and unit
- Audit login sessions only: a first `-a never,task -F auid=unset` rule keeps
services out of the per-syscall audit path. A compromised service is
therefore unrecorded until it opens a session.
- Record root commands, credential and host-key access, writes to SSH, account,
PAM, Nix-trust and audit configuration, module loads and session denials.
- Rejected: global denial logging, service-UID watches and
--loginuid-immutable (the kernel already records loginuid changes).
Verified on all four hosts after deployment: zero failed units, k3s 6/6 Ready,
and the exposed services healthy.
Assisted-by: Claude Code (claude-opus-5-5)
Turn on adaptive sync at the output only when a game window opts in, keeping desktop compositing fixed-rate to avoid idle/low-load VRR flicker. The Steam/Proton game rule enables VRR alongside the fullscreen rule.
Assisted-by: DeepSeek Harness (deepseek-flash)
XWayland/Proton windows can commit before they set a title. Excluding empty titles made Phantom Blade Zero miss the fullscreen rule and stay composited. Keep excluding the launcher announcement popup by title.
VRR is intentionally not enabled here: on-demand VRR caused display corruption in this game and is tracked separately.
Assisted-by: DeepSeek Harness (deepseek-flash)
* chore(nix): update nixpkgs to e62746b and fix 26.11 breakage
Bump nixpkgs to e62746b and preservation to 00be7f7, then adapt to the removals and renamed options in the new revision: drop the removed boot.initrd.systemd.enable settings, trim the stale emSign CA blacklist on Linux while keeping it for the older Darwin input, and migrate Avahi publishing to settings.publish. Work around sunshine still setting the legacy Avahi options and keep dsh-nu on its tested Nushell 0.115.1. Patch NUR dsh's pnpm call to pass nodejs = null, and update pyclipsync for the stdenv.hostPlatform.system rename.
* chore(nix): refresh flake inputs for 26.11
- update nixpkgs-darwin to the same e62746b revision as nixpkgs
- make dsh-nu follow main nixpkgs and patch its testedWith manifest for the resolved Nushell
- refresh floating inputs; update lanzaboote, tuios, and ponytail
- drop the nixpkgs-2505 and rust-overlay workarounds
- keep pyclipsync on main and simplify the cross-platform CA blacklist
- adopt home-manager's Nushell loadSessionVariables default
* fix(gitea): use ROOT_URL for nixpkgs 26.11
nixpkgs removed the legacy settings.server.DOMAIN option; the existing ROOT_URL already carries the public URL.
* chore(nix): update dsh-nu to 0.7.0
Assisted-by: DeepSeek Harness (deepseek-flash)
Clarify that minimality means the smallest best-practice change, not a local patch around an upstream defect.
Assisted-by: DeepSeek Harness (deepseek-flash)
The nvidia exporter binds the host's static LAN IPv4, but unlike the node and smartctl exporters it was not ordered after network-online.target. On boot it lost the race with networkd, hit the systemd start limit, and stayed failed until manually restarted.
Update the mysecrets lock to 7f93490, which renames secrets.nix to agenix-rules.nix, drops the deprecated ./ key prefixes for agenix 0.18, and re-encrypts the access-token secret. Update the docs and agenix skill to the new filename and path convention.
k8s-gitops#54 merged and reconciled, a full cold start of all six guests
brought the VIP back without manual action, and a probe from a pod shows
2379 denied while 2381 stays open. SECURITY.md records the fix and the
probe; the workaround row and its TODO entry are gone.
Assisted-by: DeepSeek Harness (gpt-6-astra)
Baseline sysctls, exporter binds and the #399/#400/#401 rules verified
live on 13 hosts; kiali self-escalation and the list-vs-get probe blind
spot recorded; WA-043 registers the k3s-test-1 Cilium/kube-vip bootstrap
cycle (WA-040 is the Root CA blacklist row); the TODO table gains the
cluster-recovery line. The same section records the manual recovery and
its fix in k8s-gitops, plus the 2026-10-24 full cold start that brought
the VIP back without manual action; WA-043 drops when #54 merges.
Assisted-by: DeepSeek Harness (gpt-6-astra)
The 2026-10-22 audit found the live socket on *:9835: #373 bound
node/smartctl in monitoring.nix, but the nvidia exporter enabled in
hardware-nvidia.nix kept the nixpkgs default, so the socket-level
defence-in-depth layer never existed for 9835.
Extend the security-exporters eval check to every enabled exporter's
listenAddress so a future exporter without a bind fails the test.
Assisted-by: DeepSeek Harness (gpt-6-astra)
The etcd client API listens on the masters' static LAN address, and the
pod-source deny lists omitted it. Add 2379 to both nft drop lines and
assert it in the security-k3s-pod-firewall eval test. 2381 (etcd
metrics, scraped by in-cluster monitoring) stays reachable by design.
Pairs with the matching Cilium egressDeny port in k8s-gitops.
Assisted-by: DeepSeek Harness (gpt-6-astra)
Nothing imported it and the riscv64 output was already commented out; riscv64 hosts live in ryan4yin/nixos-config-sbc.
Assisted-by: DeepSeek Harness 0.2.1-rc.2 (deepseek-flash)
The backup unit publishes `restic_backup_last_success_timestamp_seconds` for the node_exporter textfile collector, and a rejected alert now fails the notify unit instead of exiting 0.
Assisted-by: DeepSeek Harness 0.2.1-rc.2 (deepseek-flash)
Reading the host's install script evaluated each guest, which pulls the private secrets input, so
CI could not evaluate the suite at all.
Assisted-by: DeepSeek Harness 0.2.1-rc.2 (deepseek-flash)
On its next run the unit deletes every snapshot whose name stamp is older than 14 days, whatever
its mtime.
Assisted-by: DeepSeek Harness 0.2.1-rc.2 (claude-opus-5-5)
Colmena deployments now ship the same toplevel as nixosConfigurations: nodes gain the nixpkgs
registry, nixPath and dated version, and akane no longer gets the x86_64 dsh.
Assisted-by: DeepSeek Harness 0.2.1-rc.2 (claude-opus-5-5)
The DPMS wake failure is the monitor no-signal auto power-off (HPD cycling during idle), not the refresh rate: the 120 Hz pin did not fix it. Disabled in the OSD and recorded as WA-041; pin 144.000 explicitly so niri stops silently falling back.
Assisted-by: DeepSeek Harness (deepseek-flash)
The 4090 reports the panel 120 Hz mode as 119.880, not 120, so niri fell back to 144 Hz; that DSC link stays dark after a DPMS wake.
Assisted-by: DeepSeek Harness (deepseek-flash)
The guest configurations import modules/base/overlays.nix, whose overlays
require myNurPkgs, so every VM host failed to evaluate its microVM definitions.
Assisted-by: DeepSeek Harness 0.2.1-rc.2 (deepseek-flash)
Hosts without Home Manager (aquamarine, the VM hosts, k3s guests) had no
interpreter. The system profile is separate from the per-user one, so desktops
keep their Home Manager copy in PATH.
Assisted-by: DeepSeek Harness 0.2.1-rc.2 (deepseek-flash)
The lock bump moves the input from 47c813c to b8e30ec. The guide now says which Nushell the bundle builds against and that its pin warns on divergence, names direct script execution as the replacement for a refused shell handoff, and uses a Nushell stderr redirect in the verification snippet.
Assisted-by: DeepSeek Harness (deepseek-flash)
* chore(agents): build dsh-nu from its own flake
NUR now keeps only dsh, so a plugin release needs `nix flake update dsh-nu` instead of a NUR package update.
Loading the output preset replaces the GUI-managed Excluded Apps list, so the
exclusions are declared in the preset. Meeting apps apply their own gain
control, and local media playback is better left unprocessed.
Assisted-by: DeepSeek Harness 0.2.1-rc.2 (deepseek-flash)
EasyEffects 8 keeps its KConfig settings database plus user presets, autoload
profiles and imported models under $HOME, which the tmpfs root drops on
reboot; bind-mount both directories from /persistent.
Assisted-by: DeepSeek Harness 0.2.1-rc.2 (deepseek-flash)
Ryan Yin
ryan4yin | 二花