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The title pretty much says it all. I'm running slackware v9.1, and I want to limit users who can actually use the su command. It is like this by default with Gentoo, and figured it would be a good thing to implement since I will have multiple users on the system. Add them to an administrators group in order for them to have access to su. How would I go about doing this?
Two points: first, remember to keep the setuid bit on the su binary, otherwise it won't work. Secondly you can use the pam_wheel.so pluggable authentication module to accomplish this (by default, it disallows su to all but members of the wheel group). Ranger_nemo's idea also works, though, provided you remember my caveat about keeping su setuid root.
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