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/etc/pam.d/system-auth の reject_username に関する正確なポリシーは何ですか?

Solution In Progress - Updated -

Issue

man pam_cracklib マニュアルでオプションについて説明されています。

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.

ユーザー名の一部の文字 (完全一致ではない) を含める場合に、"reject_username" オプションは適切に適用されますか?

Environment

Red Hat Enterprise Linux 6.3

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