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I have a Raspberry pi 4 with a Linux OS & I am using a Macbook. The two machines are in the same LAN.

Raspberry pi IP address is 192.168.10.11. I can ping the Raspberry Pi from my MacBook terminal successfully.

On my MacBook, I generated a ssh key pair under ~/.ssh/, file names are raspberry and raspberry.pub.

In the terminal of my Macbook, I executed command:

ssh-copy-id -f -i raspberry.pub [email protected]

I verified that it successfully added the public key to the ~/.ssh/authorized_keys file of the Raspberry Pi. And I verified it by login as a root user in the Raspberry Pi.

Then, in a new terminal session of MacBook, I run ssh connection to the Raspberry pi:

ssh [email protected]

I thought it would not ask me password to login but I still get a password prompt asking for the root user password. And if I enter the correct password, I can login to Raspberry pie as a root user.

But why it asks password when making SSH login from my MacBook to the Raspberry Pi? I mean the public key is there under root user's ~/.ssh/authroized_keys of the Pi. Where do I miss?

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    At least with OpenSSH, non-default identity files need to be passed explicitly on the command line afaik ex. ssh -i ~/.ssh/raspberry [email protected]
    – steeldriver
    Feb 17, 2023 at 16:29
  • 3 things : Does the right of the keys 600 (if not the private key isn't read at all), then why don't use ssh -i to provide the real private key while login (it search perhaps for id_rsa) and lastly did you check if root can login remotely on Rasp-pi.
    – admstg
    Feb 17, 2023 at 16:31
  • Oh! yes, without specifying the private key, it would use the default id_rsa I suppose.
    – user842225
    Feb 17, 2023 at 16:32
  • Exactly that! I noticed alternatively I could just do ssh-add ~/.ssh/raspberry then the ssh connection could be established without specifying the private key ssh root@<IP of the PI>
    – user842225
    Feb 17, 2023 at 16:34

1 Answer 1

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You can create a config file inside your .ssh folder and add IdentityFile /home/youruser/.ssh/mykey to set the default key to use.

After which, check that the SSH dir and its contents have the right permissions (you can run stat --format '%a' <file or dir>):

  • .ssh: 700
  • private key: 600
  • public key: 644
  • authorized_keys: 600
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  • This also can be set per remote host, so individual remotes will use different keys, and yet you never need to specify them on the command line.
    – Nikita Kipriyanov
    Feb 18, 2023 at 5:19

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