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- From: franks@hpuamsa.neth.hp.com (Frank Slootweg CRC)
- Date: Thu, 19 Nov 1992 14:39:48 GMT
- Subject: Re: root access to nfs filesystems
- Message-ID: <28510360@hpuamsa.neth.hp.com>
- Organization: Hewlett-Packard, The Netherlands
- Path: sparky!uunet!cs.utexas.edu!sdd.hp.com!hpscit.sc.hp.com!scd.hp.com!hpscdm!hplextra!hpcc05!hpbbn!hpuamsa!franks
- Newsgroups: comp.sys.hp
- References: <1992Nov16.234717.18547@nosc.mil>
- Lines: 24
-
- b_kondalski@vssi.trw.com (Brian J. Kondalski) writes:
-
- >In article <1992Nov17.170956.29695@lmpsbbs.comm.mot.com> bennett@areaplg2.corp.mot.com writes:
- >>That will be supported as of 9.0. Currently you can do it by modifying the
- >>kernal, However, this is a security hole because it maps all pcnfs users to root.
- >
- >My pcnfs users have a userid when they mount via nfs from my 750. If they
- >don't have permission to modify a file, then they can't. And I have patched
- >my kernel to allow root export. Where does this security hole come in?
-
- 1. Probably your pcnfs users can modify all/most files on "their" PC. If
- so then they can become pseudo-root on their PC and hence real root
- on your NFS server(s).
-
- 2. Even if 1 is unlikely/impossible then Mr. Hacker comes along with
- *his* laptop (palmtop? :-)) connects it to your LAN and has full root
- access to your NFS server(s).
-
- In many/most cases root access via NFS is not needed, i.e. ARPA/
- Berkeley services (including fbackup, rdump, etc.) can often be used as
- an alternative. If you really need such access, then you'd better wait
- till 9.0 for the reasons given above.
-
- Frank Slootweg, HP, Dutch Customer Response Center
-