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How can I prevent users from changing their passwords? I still want to be able to change the passwords as root if necessary but keep the user from changing their password.

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This question may be useful –  yentup Feb 6 '13 at 0:55
Chmod the passwd command so that only you can execute it –  Mawg Feb 6 '13 at 1:24
Why would you want to lower user security? –  mdpc Feb 6 '13 at 2:40
@mdpc I don't. I plan on changing the password periodically, but I need it to be changed by me because it is a shared account and I don't want someone to change the password without the other people who have access being notified. –  Vreality Feb 10 '13 at 1:17

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up vote 4 down vote accepted

Do chmod go-rx /usr/bin/passwd Normal users can then not run passwd. If you want some users to be able to, you can put them in a special group perhaps.

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Would this still work? cp /usr/bin/passwd . ; chmod +x ./passwd ; ./passwd –  f.ardelian Jul 16 '13 at 16:00
@f.ardelian The thing is, passwd has some special magic called "setuid" on it - that means that when someone runs the file, they're running it as its owner (namely, root.) This allows normal users to change the /etc/shadow file containing the passwords. If you were to copy the file to a user's home directory, it would no longer be setuid, and therefore no longer be automatically run with root priviledges. To learn more, look up information about "Unix permissions" and "setuid". –  JamesTheAwesomeDude Dec 7 '13 at 22:03
@JamesTheAwesomeDude Thanks, that was very informative! –  f.ardelian Dec 8 '13 at 4:53

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