This is very useful if you want to disallow users to use same old passwords. The old password file is located at/etc/security/opasswd. This can be achieved by using?PAM?module.

Open ‘/etc/pam.d/system-auth‘ file under?RHEL / CentOS / Fedora.

# vi /etc/pam.d/system-auth

Open?‘/etc/pam.d/common-password‘ file under?Ubuntu/Debian/Linux Mint.

# vi /etc/pam.d/common-password

Add the following line to ‘auth‘ section.

auth sufficient pam_unix.so likeauth nullok

Add the following line to ‘password‘ section to disallow a user from re-using last?5?password of his or her.

password sufficient pam_unix.so nullok use_authtok md5 shadow remember=5

Only last?5?passwords are remember by server. If you tried to use any of last?5?old passwords, you will get an error like.

Password has been already used. Choose another. 與50位技術專家面對面20年技術見證，附贈技術全景圖

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