cproudlock fe4f44f855 Lock the shared fleet key away from the people standing at the bay ...

The generated install.ps1 wrote the collector key to HKLM\SOFTWARE\GE\ShopDB and
left it at the DACL the key inherits, which grants BUILTIN\Users read. Any
operator logged on to any bay could read the fleet key, and that key still
authenticates an un-enrolled PC: it claims queued commands and downloads script
bodies and installer packages. The per-PC credential work exists to retire that
key, but it stays until every consumer is off it, so meanwhile what matters is
who can read it.

Protect-HklmShopdbKey breaks inheritance, DROPS the inherited entries rather
than copying them - copying is what silently preserves the Users read - and
states SYSTEM and Administrators by SID in both registry views. By SID, so a
localised Windows still matches.

Everything that legitimately reads this key is SYSTEM (the service, the
GE-Enforce reporters) or an administrator (the adoption tool,
Set-ShopDBServerPins.ps1). The tray reads no registry at all - it talks to the
service over the named pipe - so nothing loses access.

It runs for the key-less package too, because ServerPins live in the same key
and the registry is authoritative for pinning: a standard user must not be able
to rewrite the pins either.

A bay that cannot take the ACL still installs. It says so, loudly, rather than
failing the install or staying quiet, because an agent that is not installed is
a worse outcome than a key that is still readable on that one machine.

Note what this does NOT fix: bays that already carry the key keep their
inherited DACL until they are reinstalled or upgraded through a package built
after this change.

2026-09-18 13:29:36 -04:00

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