On Tue, 25 Oct 2016, Rich Shepard wrote:
> Having new installations of Slackware-14.2 on three hosts now (two more to
> go after I get these three fully functional), I want to change my ssh
> private and public keys using a new passphrase and type.
Keeping the same thread going, I've read the ssh, sshd, ssh_config,
sshd_config, ssh-keygen, and ssh-agen man pages and searched the web for
usage examples and still have a few unanswered questions.
On the desktop I generated a new ed25519 key pair. Wanting to set up
communications between this host and the ThinkPad I tried
scp ~/.ssh/id_ed25519.pub typha:.ssh
(and a couple of different references to the remote host) but the connection
was refused.
I copied the public key to a USB thumb drive and manually installed it in
typha: ~/.ssh.
Then, logged into typha, I tried to scp ~/ from the desktop. Openssh told
me it didn't recognize the remote machine and asked it I wanted to continue.
I responded, "yes," and the public key was added to the ThinkPad's
authorized_hosts file, but the connection was refused. Is the next step to
specify verbotisty levels, e.g., 'ssh -vv <remote_host>'?
On a related issue, as authorized_hosts holds public keys from remote
hosts, and I'm essentially starting from a clean slate with the portables
and the desktop, can I remove that old file from the desktop's ~/.ssh/ and
start over again when I use ssh/scp from a portable to the desktop?
On another related OpenSSH issue: ssh-agent. I've not before used it but
it looks useful. If I understand the man page, I run it on hosts that will
remotely connect to the desktop (the portables) so when they boot they'll
have the public key available to all shells and I'll not need to enter my
pass phrase each time I want to establish a secure connection. Is this
correct? Should I also run it on the desktop?
Rich
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