[PATCH] sshd_config: allow directories in AuthorizedKeysFile=

[lucab]

This is a convenience copy for reviews/comments only, patch submission is in bugzilla .

This commit enhances AuthorizedKeysFile= to accept directory paths in addition to single files. It provides an include semantics mimicking .d / run-parts(8) approach, offering a consistent way for different entities to add public keys to a given account without single-file contention.

[lucab]

Forwarded to https://bugzilla.mindrot.org/show_bug.cgi?id=2755.

[lucab]

@djmdjm I've rebased and updated this with the comments from Bugzilla, can you please have a look?

[bgilbert]

ssh-key-dir is an AuthorizedKeysCommand implemented as a workaround for the missing ~/.ssh/authorized_keys.d support. It's been shipping in Fedora CoreOS by default for a couple years now.