1

I had setup password-less SSH login from my desktop to my laptop following the steps here. Now I want to turn off the password-less login so that when I ssh from my desktop to my laptop, it will ask for the password. How do I do it?

7

Disable pubkey authentication on the client where you don't want to use it.

ssh -o PubkeyAuthentication=no your_host

or in your ~/.ssh/config:

Host your_host
  PubkeyAuthentication no

If you want to remove the public key from the server, you need to remove the appropriate line from ~/.ssh/authorized_keys on server.

  • Can the public key from the server be deleted? – In78 Mar 13 '16 at 16:45
  • Yes. You will remove it the opposite way as you added it there. The file is ~/.ssh/authorized_keys. – Jakuje Mar 13 '16 at 18:12
1

As

ssh -o PubkeyAuthentication=no your_host

can easily be reverted by anyone who has access to the client to login to your laptob without needing a password at all, it may be a better choice to use a password encrypted private-key for those destinations, where you want to be asked for a password before login.

  • Or remote the key entirely. But it is not clear what is the OP intention. – Jakuje Mar 13 '16 at 12:05
  • Can the public key on the laptop(the host) be deleted? – In78 Mar 13 '16 at 16:42
  • yes, it can. the public keys are stored on the host in the file $HOME/.ssh/allowed_keys - one key each line. – cmks Mar 13 '16 at 16:46

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.