having root on server, add user's public key to his keys (no password required)

cat user_public_key.pub | ssh [email protected]<host> "cat | su -c 'mkdir -m 700 -p ~/.ssh && cat >> ~/.ssh/authorized_keys && chmod 600 ~/.ssh/authorized_keys' <user>"

By: noisy
2016-05-09 08:48:40

2 Alternatives + Submit Alt

What Others Think

First of all, this requires SSHD to be running with PermitRootLogin Yes in /etc/ssh/sshd_config which is off by default on most servers these days. People use sudo for best practice or just su - at least. This command looks a little dangerous. I don't have a sandbox server/VM to test it on at the moment but it looks like you'd want to specify ~USER/.ssh/authorized_keys instead of ~/.ssh/authorized_keys. Same for ~user/.ssh/authorized_keys of course. I think you might have the order of parameters mixed up. You have to do su -c ... NOT su -c ...
sonic · 232 weeks and 2 days ago
Oh right, this reads HTML.. you have to do: su - user -c .. not su -c ... user
sonic · 232 weeks and 2 days ago
too many cats
mpb · 230 weeks ago
(or her keys)
trissypissy · 228 weeks and 4 days ago

What do you think?

Any thoughts on this command? Does it work on your machine? Can you do the same thing with only 14 characters?

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