limitation of user a/c ( telnet service )

[James Wilkinson]

Les wrote:
> My bad... I didn't realize that would happen.  I had used this on some
> other OS some time ago and it did work as I stated.  I should have
> checked it here first.  I created a test file, changed its mode to 755,
> then sourced it and it did source correctly, but then I typed rm
> filename and I got a prompt to let me remove a protected file and sure
> enough the regular user could do that.  So in Linux, anyway, I am not
> sure how you can affect the user individaully other than perhaps a group
> policy.  This would seem to be a "loose end" in terms of control by the
> admin.

You use chattr to set the immutable attribute (this needs to be done as
root).  Until this attribute is removed, no-one can change or delete the
file:

   A file with the ‘i’ attribute cannot be modified: it cannot be
   deleted or renamed, no link can be created to this file and no data
   can be written to the file. Only the superuser or a process
   possessing the CAP_LINUX_IMMUTABLE capability can set or clear this
   attribute.
      (-- man chattr)

Hope this helps,

James.

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