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Submitted by xman on Sun, 17/09/2006 - 10:37pm
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It's convenient to setup passwordless SSH in a closed environment. Connecting to remote hosts becomes handy. Passwordless SSH Setup Step-by-Step:
1. Generate RSA public and private keys.
xman@sai ~ $ ssh-keygen -t ssh-rsa Generating public/private rsa key pair. Enter file in which to save the key (/home/xman/.ssh/id_rsa): Created directory '/home/xman/.ssh'. Enter passphrase (empty for no passphrase): Enter same passphrase again: Your identification has been saved in /home/xman/.ssh/id_rsa. Your public key has been saved in /home/xman/.ssh/id_rsa.pub. The key fingerprint is: xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx xman@sai
You have to enter empty passphrase, trading off security for the convenient connecting to remote hosts.
2. Append the content of the generated public key, id_rsa.pub, into the file $HOME/.ssh/authorized_keys at the remote host. The folder .ssh and the file authorized_keys at remote host must not allow group, or other access, in particular, set the permissions of .ssh to 700 and authorized_keys to 600.
Now you can simply "ssh remotehost" without the need to type password. :) The first time you connect to remote host using ssh:
xman@sai ~ $ ssh remotehost The authenticity of host 'remotehost (192.168.1.100)' can't be established. RSA key fingerprint is xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx. Are you sure you want to continue connecting (yes/no)? yes Warning: Permanently added 'remotehost' (RSA) to the list of known hosts. Last login: Sat Sep 9 23:50:33 2006 from localhost xman@remotehost ~ $
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