Verify Permissions and Ownership of Old Passwords File

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Description

To properly set the owner of /etc/security/opasswd, run the command:

$ sudo chown root /etc/security/opasswd

To properly set the group owner of /etc/security/opasswd, run the command:

$ sudo chgrp root /etc/security/opasswd

To properly set the permissions of /etc/security/opasswd, run the command:

$ sudo chmod 0600 /etc/security/opasswd

Rationale

The /etc/security/opasswd file stores old passwords to prevent password reuse. Protection of this file is critical for system security.