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George Borisov 04-18-2008 12:24 PM

Nis problem
 
Arvind Marathe wrote:

On Fri, Apr 18, 2008 at 5:03 PM, Eduardo M KALINOWSKI <ekalin@gmail.com> wrote:

Stephane Durieux wrote:
> Hello
>
> I am encountering a problem with a nis server.
> Local root on client can do su user without giving the password
> of the user.
>
> root squashing is enabled.
>
> What can I do


<-snip->


I am facing the same problem and haven't found any solution.


As far as I know, there isn't a solution. NIS+NFS is an easy setup at
the expense of offering no real security.


NFS design assumes that client's root user can be trusted. As long as
you have root on the client machine, you have access to the user files
on the NFS export. This is the same with, or without NIS.


Basically, NFS takes the numeric UID the client supplies and matches it
against permissions on the files. The only exception is the "root
squash" option which takes UID 0 (root) and remaps it to a guest account
with no access.


Using LDAP instead of NIS may be the solution, but I don't have any
practical experience with this.



Hope this helps,

George.


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