14.04 - How to make sure that only the administrator can change passwords - Ask Ubuntu


how make sure non-administrator user can not change own password? want administrator that.

you can remove setuid bit passwd binary:

sudo chmod u-s /usr/bin/passwd

although not recommended.

the /usr/bin/passwd binary setuid executable owner root, when passwd executed run root (so necessary changes in /etc/passwd, /etc/shadow files can done). removing setuid bit, have removed capability.


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