[SSH] To examine the Linux PAM for login mechanism

Based on Linux PAM module, we can easily configure the related pam file and use the functionality that it provides. I just examine login authentication mechanism from PAM a little bit. The scenario is like this:
  I change the login authentication mechanism from key pair to password and to see what happens in /var/log/auth.log if I give the wrong password.


/etc/ssh/sshd_config

The value to change:
PubkeyAuthentication yes ==> no
PasswordAuthentication no ==> yes

$> service ssh restart

After restarting ssh daemon, I give the wrong password and then I can see the error message in the log file:

The following image is for reference if everything is correct.


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