enricobuehler
8103958169
Acts on the 2026-08-05 host security review. 36 of its 38 findings; the two exceptions are recorded below and in the review doc. The review's headline is that `plugin_may_access` was the one authorization gate in the system that was allow-by-default — a hand-maintained denylist of route prefixes, where every sibling gate is deny-by-default. Its own doc comment names the two capabilities it exists to withhold, and both were reachable one route over, because ~1450 commits of new routes were added and the list was never one of the things anyone remembered to update. So the gate is now an allowlist, and a test walks the live route table and fails the build for any route that has not been deliberately classified for both non-admin lanes. That test is the actual fix: it is what stops the next route from arriving pre-authorized. Route reachability and field authority turned out to be different questions. A provider plugin has to be able to reconcile its own library entries — that is what a scanner plugin IS — but `prep` and a `command` launch inside that payload are handed to `/bin/sh -c` as the host user, and every execution site documents them as operator-typed. Requests now carry the lane that authorized them, and those two fields are refused to everyone but the operator's own token. The art proxy read any absolute path off disk in the host process, which on Windows is LocalSystem, from a path the plugin lane could write and then read back — so it yielded `mgmt-token`, which is full admin. It now serves only real images (extension AND magic bytes, so a renamed secret fails), only from inside an allowed root, only after canonicalization, and never over UNC; and a path it would refuse to serve can no longer be persisted in the first place. On Windows, the config-dir hardening was skipped exactly when it was needed — it ran only in the branch that CREATES host.env, so the case it was written for (a local user pre-created the directory and planted one) was the one case it never ran in. It is now unconditional and first, an existing host.env is re-owned, and the inheritable OWNER RIGHTS ACE that kept an attacker's files theirs after the directory was re-owned is gone. The identity and token readers were hardening the directory only on the path that GENERATED a new secret, so a planted cert/key or token was adopted verbatim and permanently; they harden before the first read now. `ensure_admin_only_source` is implemented. The 2026-07-05 audit recorded it as FIXED and it was in no commit in this repository's history — the local EoP it described was live, and it is the payload half of the config-dir chain above. Also: the three input planes are bounded and lossy like the mic plane on the same loop already was; Android's library client no longer accepts any publicly-trusted certificate for the pinned host; the usbip vhci nodes get their own group instead of riding on `input`, which every packaging scriptlet tells users to join; a registry URL can no longer inject a TOML table into bunfig.toml; the pairing cooldown is charged before the arming state is read, so armed/disarmed is no longer a free oracle; and the whole Low tier, of which the two worth naming are a clipboard MIME NUL that panicked the host on one control message, and an unauthenticated global logout that let any LAN peer sign the operator out on a loop. NOT fixed, deliberately: H-3 (plugin UIs framed allow-same-origin). Dropping allow-same-origin does not work: the document's origin goes opaque, its subresource requests are then cross-site, the SameSite=Lax session cookie is not sent, and every plugin asset 302s to /login. The "open in new tab" link is the same escalation with no iframe at all, so the sandbox attribute is not where this gets fixed either. It needs a second listener — a distinct origin that is still the same site — which changes the console's deploy model and wants on-glass validation. The mechanism and the dead end are written down at the iframe. H-6 registry authentication, whose other half lives in unom/infra. The in-repo halves are done: workflow_dispatch inputs no longer interpolate into run: blocks (one of them in the step holding UPDATE_MANIFEST_KEY), and the syft installer is pinned to its tag instead of main. Digest pinning is left until the registry is authenticated, because a tag — content-keyed or not — can simply be overwritten while anonymous pushes are accepted. M-5 is half done: the oracle is closed, but binding the arming window needs the console to learn the fingerprint first, which is a knock-then-bind flow rather than an edit. Verified: cargo fmt --all --check clean; cargo check --all-targets green on Linux and on Windows (confirmed non-vacuous — a planted type error in windows/install.rs fails the build); scripts/xcheck.sh windows check green; cargo test -p punktfunk-host --bins 416 passed, the single failure being gamestream::stream::tests::sender_delivers_batches, the known qemu-environmental UDP-loopback flake that fails identically on clean main in the same container; cargo test -p pf-clipboard 13 passed; web console typechecks.
Packaging punktfunk for Fedora / Bazzite
The punktfunk host links system FFmpeg (NVENC on NVIDIA, VAAPI on AMD/Intel, with a GPU-less software-H.264 fallback), PipeWire and Opus. This page covers packaging it for the Fedora Atomic / Bazzite world (rpm-ostree + bootc), where most of those deps are already present; the NVIDIA-specific notes below apply to the NVENC path.
👉 Ubuntu/Debian hosts install via
aptfrom Gitea's package registry — seedebian/README.md(apt update && apt upgradefor new builds).
👉 End-to-end Bazzite setup walkthrough (install → udev/group →
host.env→ service → firewall → verify → troubleshooting):bazzite/README.md. This file is the higher-level packaging rationale.
packaging/
rpm/punktfunk.spec # the RPM (builds punktfunk-host from source with cargo)
bazzite/host.env # gamescope-default config for a Bazzite appliance
bazzite/README.md # step-by-step Bazzite setup guide
bazzite/*sysext*.sh # the no-layering path: build/install/publish the systemd-sysext
bootc/Containerfile # bake punktfunk into a Bazzite-based atomic image
copr/ # COPR build-from-SCM settings
The other packaging targets have their own READMEs: debian/ (apt),
arch/ (pacman binary repo + PKGBUILD + SteamOS sysext),
flatpak/ (the client), windows/ (host installer +
drivers), plus kde/ and linux/ helpers. NixOS / Nix users get a flake (flake.nix at the
repo root) with reproducible host + client packages and a services.punktfunk NixOS module —
see nix/README.md.
What's needed beyond base Fedora
| Dependency | Where it comes from |
|---|---|
ffmpeg-libs with NVENC |
RPM Fusion nonfree (ffmpeg, not ffmpeg-free) |
NVIDIA driver (libnvidia-encode, libEGL_nvidia) |
Bazzite -nvidia images ship it; plain Fedora: akmod-nvidia + xorg-x11-drv-nvidia-cuda |
| gamescope, PipeWire, wireplumber | Bazzite ships these; plain Fedora: dnf install gamescope pipewire wireplumber |
opus, libei |
Fedora base / updates |
On Bazzite the only genuinely new runtime bits are ffmpeg-libs (RPM Fusion) + opus +
libei — the rest of the stack is already there. The default backend is gamescope
(packaging/bazzite/host.env), which the host spawns headless per session — no desktop login.
Option A — systemd-sysext (recommended; no layering, no reboot)
On Bazzite / Fedora Atomic the recommended install is the systemd-sysext image — rpm-ostree
layering is a last resort per the Bazzite docs (it slows every OS update and can block upgrades),
while a sysext overlays /usr at runtime, survives OS updates, and updates in one command with
no reboot. CI wraps the same RPMs below into the image, so content and channels are identical.
curl -fsSLO https://git.unom.io/unom/punktfunk/raw/branch/main/packaging/bazzite/punktfunk-sysext.sh
sudo bash punktfunk-sysext.sh install # then: sudo punktfunk-sysext update | status | remove
Full walkthrough (incl. the F43→F44 rebase behavior and migration off layering):
bazzite/README.md.
Option B — Gitea RPM registry (per-host, rpm-ostree layering)
The host's RPM is published to unom's self-hosted Gitea RPM registry (CI builds it on every
push), mirroring the Debian/apt setup. Add one repo file, install, and track
updates with rpm-ostree upgrade — no COPR account needed. Full guide: rpm/README.md.
# GPG-signed pkgs + Gitea-signed metadata → gpgcheck=1, repo_gpgcheck=1 (see rpm/README.md)
sudo tee /etc/yum.repos.d/punktfunk.repo >/dev/null <<'REPO'
[gitea-unom-bazzite]
name=punktfunk (unom, Bazzite)
baseurl=https://git.unom.io/api/packages/unom/rpm/bazzite
enabled=1
gpgcheck=1
repo_gpgcheck=1
gpgkey=https://git.unom.io/api/packages/unom/rpm/repository.key
https://git.unom.io/api/packages/unom/generic/punktfunk-keys/1/RPM-GPG-KEY-punktfunk
REPO
rpm-ostree install punktfunk && systemctl reboot
# updates: rpm-ostree upgrade && systemctl reboot
Option C — COPR (per-host, rpm-ostree install)
- Create a COPR project, enable build-from-SCM pointing at this repo, spec path
packaging/rpm/punktfunk.spec(seecopr/README.md). Under External Repositories add RPM Fusion nonfree soffmpeg-develresolves at build time. - On the Bazzite host:
# RPM Fusion (for the NVENC ffmpeg) — usually already enabled on Bazzite rpm-ostree install \ https://mirrors.rpmfusion.org/free/fedora/rpmfusion-free-release-$(rpm -E %fedora).noarch.rpm \ https://mirrors.rpmfusion.org/nonfree/fedora/rpmfusion-nonfree-release-$(rpm -E %fedora).noarch.rpm # enable the COPR + install punktfunk sudo wget -O /etc/yum.repos.d/_copr_punktfunk.repo \ https://copr.fedorainfracloud.org/coprs/enricobuehler/punktfunk/repo/fedora-$(rpm -E %fedora)/ rpm-ostree install punktfunk systemctl reboot
Option D — bootc (image-based, atomic)
Layer punktfunk into a Bazzite image once, then rebase any number of hosts onto it — no
per-host drift. See bootc/Containerfile:
podman build -t ghcr.io/<you>/bazzite-punktfunk -f packaging/bootc/Containerfile .
podman push ghcr.io/<you>/bazzite-punktfunk
# on the target:
sudo bootc switch ghcr.io/<you>/bazzite-punktfunk && systemctl reboot
First-run setup (all options)
ujust add-user-to-input-group # virtual gamepads need /dev/uinput (then re-login).
# On Bazzite use ujust, NOT `usermod -aG input` (atomic OS — it won't stick).
mkdir -p ~/.config/punktfunk
cp /usr/share/punktfunk/host.env.bazzite ~/.config/punktfunk/host.env # edit (gamescope app, etc.)
systemctl --user enable --now punktfunk-host
# Management web console (pairing + status) — pulled in by default (the host RPM Recommends it;
# `--no-install-recommends` / headless-only boxes can skip it). Enable it and read the login password:
systemctl --user enable --now punktfunk-web
journalctl --user -u punktfunk-web-init | sed -n 's/.*password generated: //p' # then open https://<host-ip>:47992
Pair a stock Moonlight client (mDNS-discovered), or connect the native punktfunk/1 client — via the
web console at https://<host-ip>:47992 or directly.
⚠️ COPR caveat: COPR's mock chroot has no
bun, so a COPR build produces onlypunktfunk+punktfunk-client— notpunktfunk-web. For the console on a COPR/bootc host, install from the Gitea RPM registry (Option B — it carriespunktfunk-web; the sysext image includes it too), which is also whybootc/Containerfileinstalls from there rather than COPR.
Why not Flatpak (for the HOST)?
The host needs unsandboxed access the zero-copy NVENC path, /dev/uinput, the PipeWire
graph and the compositor's privileged protocols — a Flatpak sandbox fights all of these.
An RPM (or the bootc layer) installs into the host system where those just work.
👉 The client is a different story — it IS shipped as a Flatpak (the only viable Steam Deck install path: SteamOS
/usris read-only and lackslibadwaita/libSDL3). Seeflatpak/README.md. The client sandbox only needs the GPU render node, Wayland, PipeWire audio, the network and hidraw — all expressible as finish-args.
Building the SRPM/RPM locally (Fedora only)
git archive --format=tar.gz --prefix=punktfunk-0.3.0/ -o ~/rpmbuild/SOURCES/punktfunk-0.3.0.tar.gz HEAD
rpmbuild -ba packaging/rpm/punktfunk.spec # needs the BuildRequires from the spec
# (0.3.0 = the spec's default %{pf_version}; the prefix and tarball name must match it)
(Not buildable on Debian/Ubuntu — use a Fedora toolbox/container or COPR.)