[sec-check] fix: harden sshd drop-in — key-only auth, no root password login - #29
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…disable password auth PermitRootLogin yes + PasswordAuthentication yes shipped in the image exposed brute-forceable remote root login. Switch to key-only auth (PermitRootLogin prohibit-password, PasswordAuthentication no, KbdInteractiveAuthentication no). Refs #28 Signed-off-by: sec-check <sec-check[bot]@users.noreply.github.com>
This was referenced Aug 27, 2026
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PermitRootLogin prohibit-password, PasswordAuthentication no, KbdInteractiveAuthentication no — correct hardening. Confirmed only one sshd drop-in file exists in the repo, so there's no conflicting override. CI green.
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Security Fix
Cluster:
files/os/ssh/sshd_config.d/bluefin-server.conf,elements/bluefin-server/os-sshd-config.bst(sshd config only — disjoint from open PXE/installer PRs #22/#25/#26/#27).Shipped sshd drop-in set
PermitRootLogin yes+PasswordAuthentication yes, andzz-enable-sshd.presetenables sshd on first boot — exposing brute-forceable remote root login on every deployed host.Changes:
PermitRootLogin prohibit-password(key-only root access)PasswordAuthentication noKbdInteractiveAuthentication noPreset left untouched — sshd stays available, but key-only. Full removal of the bring-up preset is a maintainer decision tracked in the issue.
Refs #28
Filed by sec-check agent (ACMM L4/L5 — hold-gated mode). Hold-gated: human review required.
— hive: agent=sec-check backend=copilot model=kimi-k3