NAS-143402 / 26.0.0 / Stricter user SSH public key validation to match OpenSSH behavior - #19652
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sshd opens the
authorized_keysfile as the user itself, so every directory leading to the home directory has tobe traversable by the account.
On top of that
StrictModesmakes sshd refuse to use the file when the home directory is world-writable or isowned neither by the user nor by root.
A public key that is stored under any of those conditions silently never authenticates anyone, so it should be rejected up front.