A systems administrator needs to enforce a new security policy that requires all user passwords to have a minimum length of 12 characters. Which file should the administrator edit to configure this system-wide setting for user accounts?
/etc/shadow
/etc/default/useradd
/etc/login.defs
/etc/security/limits.conf
The correct file to modify is /etc/login.defs. This file contains system-wide definitions for the shadow password suite, including the PASS_MIN_LEN parameter, which sets the minimum number of characters required for a password. The /etc/shadow file stores user password hashes and aging information, but not policy settings. The /etc/default/useradd file sets default options for creating new users, such as their default shell or home directory, but does not include password length. The /etc/security/limits.conf file is used to set resource limits for users, such as the maximum number of open files or processes, not password policies.
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