Commit Graph
7 Commits
Author SHA1 Message Date
enricobuehler 8103958169 fix(security): the plugin lane stops being a way in
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.
2026-08-05 17:12:12 +02:00
enricobuehler fbe1e62ef2 Merge commit '0c9d3ee3' into HEAD
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2026-07-17 20:11:08 +02:00
enricobuehlerandClaude Fable 5 0c9d3ee33f fix(windows-clippy): pf-frame SAFETY comments + checked_div, pf-clipboard SAFETY placement + Gdi feature
Surfaced by giving windows-host CI its missing pf-encode/pf-frame path triggers:
the T2.3 auto-gate (dxgi.rs) and the clipboard host (windows.rs) landed with
Windows clippy owed — three undocumented unsafe blocks, one manual checked
division, one comment orphaned off its statement, and a latent E0432 in
standalone pf-clipboard builds (WNDCLASSW needs Win32_Graphics_Gdi; the host
graph only compiled via feature unification).

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
2026-07-17 20:08:44 +02:00
enricobuehlerandClaude Opus 4.8 055b95a181 fix(pf-clipboard): winfmt layout + wayland map test for the JPEG/GIF pass-through
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Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
2026-07-17 19:33:51 +02:00
enricobuehlerandClaude Opus 4.8 f4b52d0bf5 feat(clipboard): pass original JPEG/GIF through verbatim beside the PNG floor
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Transcoding every image to PNG was the Phase-1 floor, but it bloats lossy
originals (a copied JPEG re-encoded lossless is 5-10x the bytes for zero
quality gain — feeding the render-timeout on constrained links) and flattens
GIFs to one frame. The wire already carries kind LISTS, so offer the original
format beside the portable fallback and let the destination pick:

- New wire kinds image/jpeg + image/gif (§3.5 extension; strings only, no
  protocol change). image/png stays the universal floor every peer accepts.
- macOS: public.jpeg / com.compuserve.gif rows pass through verbatim both
  directions; the PNG floor is announced whenever any image is present.
- Windows: registered JFIF/GIF formats read + promised verbatim; every image
  offer still promises CF_DIB, whose delayed render now fetches the richest
  offered kind (png > jpeg > gif) through the generalized image_to_dib.
- Linux maps gain the matching rows (native MIME pass-through).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
2026-07-17 19:32:04 +02:00
enricobuehlerandClaude Opus 4.8 c28b10a5b9 fix(apple/clipboard): announce + serve image/png from ANY pasteboard image type
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macOS image copies rarely carry public.png — screenshots/Preview put TIFF on
the pasteboard, browsers add WebP/AVIF/GIF (observed live: TIFF+RTFD+WebP+AVIF+
8BPS+GIF, no PNG) — so the literal .png announce never fired and images
silently didn't sync. Announce image/png whenever a convertible image is
present (TIFF/HEIC alongside the native PNG check) and convert at serve time
via NSImage -> NSBitmapImageRep PNG (lazy, per design §3.5 — bytes still cross
only on a host paste).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
2026-07-17 19:07:33 +02:00
enricobuehlerandClaude Opus 4.8 391f8fb9f7 feat(clipboard): Linux + Windows host clipboard backends as the pf-clipboard crate (Phase 1 host + Phase 3)
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The host half of the shared clipboard (design/clipboard-and-file-transfer.md §4),
ported from feat/shared-clipboard (6bd8c18b) into the post-W6 crate shape: the
backends land as a pf-clipboard subsystem crate (the pf-inject/pf-capture
pattern) instead of growing punktfunk-host back out, and the ~340-line
punktfunk1.rs integration is re-implemented against the native.rs/control.rs
split that replaced it.

pf-clipboard:
- host::wayland — ext-data-control-v1 (KWin / wlroots / Sway / Hyprland).
- host::mutter — GNOME via Mutter's *direct* org.gnome.Mutter.RemoteDesktop
  clipboard (no data-control at any GNOME version; the xdg portal needs an
  interactive grant a headless host can't answer).
- host::windows + host::winfmt — Win32 clipboard on a hidden message-loop
  window: WM_CLIPBOARDUPDATE listener + OLE delayed rendering (WM_RENDERFORMAT)
  for text / CF_HTML / RTF / PNG.
- host::session — the backend-agnostic coordinator bridging HostClipboard to
  the QUIC clipboard plane (offers, fetch accept-loop, remote offers, pastes).
- A portable facade (policy / enabled / cap_advertised / ClipCoordCmd / start /
  spawn_decline_loop) so the orchestrator compiles cfg-free on every platform;
  ClipCoordCmd moves into the crate (it was host-owned before).

punktfunk-host glue:
- handshake.rs advertises HOST_CAP_CLIPBOARD via pf_clipboard::cap_advertised.
- serve_session starts the coordinator (gated on a real compositor — the
  synthetic source stays out of the session clipboard) and spawns the
  CLIP_FETCH_UNAVAILABLE decline loop when the policy is on but no backend bound.
- control.rs gains the ClipControl/ClipOffer arms + the host-offer forward
  branch, and the e2e session test (cap advertise → ClipState ack with
  BACKEND_UNAVAILABLE → fetch decline) rides in native.rs's tests.

Still opt-in default OFF (PUNKTFUNK_CLIPBOARD). Remaining: the macOS client
(design §5) — then this becomes user-visible.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
2026-07-17 13:02:20 +02:00