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I need to restrict all access to a user on a RHEL 8 system and allow them to only change their own password. I thought that I could do

[root]$ usermod <username> -s /bin/passwd

but this is not working. What am I missing?

Update:

To be clear, the behavior is that, once the machine boots (multi-user.target) and you see that screen where you enter first your user name and then the prompt changes to ask for the password, if you enter the user for which I set the shell to either /bin/passwd or /usr/bin/passwd (and either via vipw straight into /etc/passwd or via usermod), the screen resets and in a split second it's back again to ask for a user name, as if nothing had happened. Everything else is unchanged; with root, it just continues to work as normal.

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  • That "/bin/passwd" is not a shell. Commented Oct 28, 2020 at 0:04
  • Are you trying to login with a GUI or text console? What happens if you try to ssh in as that user? Commented Oct 28, 2020 at 1:01

1 Answer 1

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What you need to do is to replace the shell in /etc/passwd file with /usr/bin/passwd or whatever is the path to your passwd command. You can do that by using the command vipw. I am not sure if chsh will allow you to change to a non-shell binary in that field.

usermod -s is also looking for an approved shell and /bin/passwd is obviously not an approved shell.

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  • btw what's an "approved" shell?
    – Katerl3s
    Commented Oct 28, 2020 at 0:44
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    An approved shell is one that the user can change to. You can get a list by using the command chsh -l.
    – unxnut
    Commented Oct 28, 2020 at 2:48

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