Key-auth-first: a KeyAuthProber seam lets the bridge skip consume+install
when the already-installed key still authenticates (pinned to the freshly
verified host key) — descriptor changes on provisioned guests no longer
loop on consume-404. Fingerprint verify still precedes everything.
Wipe-on-escrowed: confirm-escrow now calls the agent's new
DELETE /escrow/stage-secret (v0.78.0) best-effort, closing the hygiene gap
where a ceremony-less confirm left the staged password file behind.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01PSK5g6qYLknKj8u3QAFEr6
Live finding: SFTP-mode ssh-copy-id mktemp's under ~/.ssh; the container
image has no /root/.ssh, so the install died locally AFTER the one-time
password was consumed (fail-safe held; password never transmitted).
Probe confirmed the pinned known_hosts + StrictHostKeyChecking=yes chain
is sound against the real box once ~/.ssh exists.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01PSK5g6qYLknKj8u3QAFEr6
The SSHCopyIDInstaller used StrictHostKeyChecking=accept-new on the ssh-copy-id
and sftp-verify connections, so even though the bridge verifies the box host-key
fingerprint against the hub descriptor BEFORE installing, the actual install
connection was not pinned to that verified key — a MITM could substitute a
different key in the gap between the scan and the install (TOCTOU).
Now the bridge threads the scanner-verified known_hosts line into KeyInstaller,
which writes it to a temp known_hosts and connects with StrictHostKeyChecking=yes
+ UserKnownHostsFile — the install/verify sessions refuse any key but the one the
bridge already matched. Empty known_hosts now refuses to install.
Test asserts the installer receives the pinned known_hosts; red-proofed by passing
an empty line (the pre-fix TOFU shape) → test fails. Addresses the security-review
"host-key TOFU after verify" finding on internal/offsiteapply/seams.go.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01PSK5g6qYLknKj8u3QAFEr6
On startup reconcile the hub-served offsite: descriptor into a key-only offbox
target. internal/offsiteapply.Bridge: verify-pin box host key vs host_fingerprint
(NO blind TOFU) → consume the one-time password (single-use, never logged) →
sshpass ssh-copy-id -s -f install + verify → configure offbox → EscrowState=pending
(fork-4 via Manager.ApplyOffsiteTarget) → persist a descriptor-hash marker LAST.
Idempotent + fail-safe. Seams faked in tests; both red-proofs run+reverted.
Dockerfile + sshpass. NOT yet live-applied (supervised end-to-end next runbook).
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01PSK5g6qYLknKj8u3QAFEr6
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