What is the exact policy of reject_username in /etc/pam.d/system-auth?

Solution Unverified - Updated -

Issue

  • # man pam_cracklib manual shows the explanation of its option
man pam_cracklib

reject_username
           Check whether the name of the user in straight or reversed form is
           contained in the new password. If it is found the new password is
           rejected.
  • The question is that if the name of the user contains only some letters out of among itself,
    does the option "reject_username" affect properly?

Environment

  • Red Hat Enterprise Linux 6.3

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