Fix ssh-agent certificate not recognized with IdentitiesOnly #494
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The certificate present in the SSH agent is not added to the keys to be tested when 'IdentitiesOnly yes' is configured in the ~/.ssh/config file.
$ ls ~/.ssh/ config id_ed25519.pub
With the same configuration, 'ssh' defaults to looking for a certificate in ~/.ssh/id_ed25519.pub-cert::
I believe the expected behavior should also include searching for the certificate in the agent.
I have attempted a very simple fix.
The certificate is added from the agent with 'IdentitiesOnly Yes'. The code is redundant, but it works.
Yet another inconsistency: 'ssh-keygen' generates certificates in the form id_ed25519-cert.pub, whereas "ssh" searches for id_ed25519.pub-cert.