OpenSSH Public Key Authentication Setup

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This post contains a summarized recipe from OpenSSH Public Key Authentication Setup, to setup SSH public key authentication.

1. Generate key pair:
   $ ssh-keygen -q -t rsa -f $HOME/.ssh/id_rsa -C public-key1
2. Limit access:
   $ perl -i -ple 's/^/from="*.mydomain.nl" /' $HOME/.ssh/id_rsa.pub
3. Append public key to the authorized_keys file on the server (called “machine”):
   $ ssh zeger@machine.domain.nl < $HOME/.ssh/id_rsa.pub 'cat >> .ssh/authorized_keys'

Using empty passphrases is acceptable on intranet environments, so after these 3 simple steps you can login passwordlessly 😉

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