D43 = A (R-1257): the root-key-only sshd drop-in only on an appliance; on BYO nothing is written and our copy is removed; the in-force check reads the LAN addresses (X3); a failing sshd -t undoes only the SSH step (X4). Commit only, not released.

CHANGELOG.md

@@ -1,3 +1,22 @@
+## Unreleased (next: v0.165.0) — D43 = A: BYO hosts keep their own SSH settings (R-1257) (2026-10-24 night) — committed, NOT released (the release + the operator's vouch are Monday's)
+
+- **The root-key-only sshd drop-in (`/etc/ssh/sshd_config.d/10-felhom-root-key-only.conf`, R-982 / D4) goes only to an
+  appliance** — operator ruling D43 = A (2026-10-24): a BYO host belongs to its owner (`11` §1). The table entry's policy
+  is now `appliance`: written only when the ROOT-OWNED install record (`/var/lib/felhom-install/state.json`) says
+  `appliance`. On a `byo` record nothing is written, and a copy WE wrote (this exact path, beginning with our header
+  line) is REMOVED, its previous copy kept for the undo, then `sshd -t` and a reload. A box whose record is absent or
+  agent-writable proves nothing and is left exactly as it is. The bundle report lists `removed`; the record says
+  `removed` / `skipped`. The installer records the mode before it installs the bundle, so a new appliance still gets it.
+- **X3: the „in force" check asks sshd about each of the host's own LAN addresses** (`ip -4 -o addr show scope
+  global`), not only 192.0.2.1 — a `Match Address <LAN>` block that re-allows root passwords no longer reads as in force.
+- **X4: a failing `sshd -t` puts back ONLY the SSH step** (`undo_sshd_step`: the previous copy, or none; sshd is not
+  reloaded, so it never ran the refused state) and the rest of the bundle stays; it used to refuse and undo the whole
+  bundle. The report carries `sshd_step_undone`; the record names what is on disk.
+- Tests (`configs/test_felhom_config_bundle.py`, class `ByoKeepsItsSSH`, 7 tests; each rule seen failing with it taken
+  out): a BYO host gets no drop-in; our copy comes off a BYO host; the owner's own file stays; no record → left as it
+  is; a LAN `Match` block is not in force; every address key-only passes; a failing `sshd -t` undoes only the SSH step.
+  The fake box now carries an appliance record by default (every earlier test unchanged).
+
 ## 2026-10-24 (review round 2, unattended) — `.claude/rules/unprompted-work.md` aligned with its four siblings
 
 - The copy lacked item 6's paragraph „A version number is pushed once …" that the felhom.eu and felhom-controller copies