PAM is a flexible mechanism for authenticating users. For example, you do not allow users to reuse recent passwords. This can be accomplished by using the remember option for the pam unix PAM module.
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PAM
One of our article generated few more question regarding root login issues over ssh session. One of reader (eMBee) asks, “I need something that allows me to say: allow any users except root from anywhere, and root only from localhost. (over ssh session)”. PAM offers very powerful authentication control. You need to use the pam_access [...]
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