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`sshd` no longer appears to automatically pick up the new certificate
after it has been renewed by `ssh-host-cert-sign@.service`; we need to
explicitly reload it. To handle this, I've added a systemd _path_ unit
that monitors the certificate files for changes and triggers a
corresponding _service_ unit that reloads the SSH daemon.
The *ssh-host-cert-sign@.service* unit does what it says on the tin:
requests a signed host certificate from an SSHCA server. It is a
template unit, whose instances correspond to SSH key types (RSA, ECDSA,
and Ed25519). The *ssh-host-certs.target* unit depends on the three
instances of the template unit, so they can all be activated together.
This target is only activated on the first boot of the system, to
initially request the certificates.
The *ssh-host-certs-renew.timer* unit periodically renews the SSH hosts
certificates. Its corresponding target unit depends on the three
instances of *ssh-host-cert-sign@.service*, so each certificate will be
renewed independently.
The *sshca-cli* RPM package can be used to install the SSHCA CLI client
on Fedora (and other RPM-based distributions). The `.spec` file was
originally generated using [rust2rpm], but several manual modifications
were required. Notably, the script does not generate `BuildRequres`
tags when run in "vendored" mode (i.e. third-party crate sources are
included in the source RPM package instead of packaged as separate
RPMS).
Dustin