Verify user’s password on the command line
If there’s any chance you need to verify a user’s password on the command line and you are root you can use openssl with the info from /etc/shadow.
So first we want to grab the entry from /etc/shadow
cat /etc/shadow | grep mike
That will give us something that looks like
So the items we want are the $6 and the $tCFXiZHH. The $6 is important because that tells us the password is using sha512 for encryption. And the $tCFXiZHH is the salt.
So now we can run
mkpasswd -m sha-512 somePasswordHere tCFXiZHH
The output should match up with what’s above and if it is.. you have a valid password.