Date: Mon, 19 Mar 2012 14:06:51 +0400 From: Slawa Olhovchenkov <slw@zxy.spb.ru> To: "Patrick M. Hausen" <hausen@punkt.de> Cc: freebsd-stable@freebsd.org Subject: Re: ZFS & NFS Message-ID: <20120319100651.GA61230@zxy.spb.ru> In-Reply-To: <20120316201332.GN97848@zxy.spb.ru> References: <20120316172006.GM97848@zxy.spb.ru> <F53B6039-4404-49EF-88EC-96A5DDDAA881@punkt.de> <20120316174233.GN52973@zxy.spb.ru> <114CC851-7F85-470D-B203-5B2E9E35B7BD@punkt.de> <20120316201332.GN97848@zxy.spb.ru>
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On Sat, Mar 17, 2012 at 12:13:32AM +0400, Slawa Olhovchenkov wrote: > On Fri, Mar 16, 2012 at 07:34:56PM +0100, Patrick M. Hausen wrote: > > > Hello, > > > > Am 16.03.2012 um 18:42 schrieb Slawa Olhovchenkov: > > > On Fri, Mar 16, 2012 at 06:32:43PM +0100, Patrick M. Hausen wrote: > > > > > >> Hello, > > >> > > >> Am 16.03.2012 um 18:20 schrieb Slawa Olhovchenkov: > > >>> I do NFSv3 export of ZFS. > > >>> root from remote host create files on ZFS witch uid 2^32-2: > > >>> > > >>> # ls -l /usr/ports/packages32/ > > >>> total 6 > > >>> drwxr-xr-x 2 4294967294 wheel 5 Mar 17 00:57 All > > >>> drwxr-xr-x 2 4294967294 wheel 5 Mar 17 00:57 Latest > > >>> drwxr-xr-x 2 4294967294 wheel 3 Mar 17 00:52 archivers > > >>> drwxr-xr-x 2 4294967294 wheel 4 Mar 17 00:57 lang > > >> > > >> > > >> Yes? This is expected behaviour of NFS. If you don't want that, try > > >> > > >> -maproot=root > > >> > > >> either in sharenfs option to zfs or /etc/exports, whichever it is you are using. > > > > > > hmm... > > > nobody:*:65534:65534:Unprivileged user:/nonexistent:/usr/sbin/nologin > > > > > > 65534 != 4294967294 (2^16-2 != 2^32-2) > > > > > > Also, I am think ZFS+NFS will be wrong for UID>2^15. > > > > I admit I overlooked that one (16 vs 32 bits). But if I'm not mistaken, NFS does not care > > a bit about the name of the user "nobody" or the UID in /etc/passwd or what-have-you. > > It simply sets the UID of remote root (UID 0) to the value -1. > > https://blogs.oracle.com/taylor22/entry/nfs_root_access_on_sun > > === > In a default configuration, a Solaris NFS server maps "root" access to > "nobody". > === > > http://pubs.opengroup.org/onlinepubs/9629799/chap12.htm#tagcjh_13_03_03 > > === > In some operating systems, a particular user (on UNIX systems, the > user ID 0) has access to all files, no matter what permission and > ownership they have. This super-user permission might not be allowed > on the server, since anyone who can become super-user on their client > could gain access to all remote files. A UNIX server by default maps > user ID 0 to a distinguished value (UID_NOBODY), as well as mapping > the groups list, before doing its access checking. A server > implementation may provide a mechanism to change this mapping. This > works except for NFS Version 3 protocol root file systems (required > for diskless NFS Version 3 protocol client support), where super-user > access cannot be avoided. Export options are used, on the server, to > restrict the set of clients allowed super-user access. > === > > /usr/include/sys/_types.h:typedef __uint32_t __uid_t; > > > And 4294967294 happens to be -1 in 32 bits signed. So - possibly this is built into > > ZFS this way. I would at least give the sharenfs="..." options a try ... > > 4294967294 happens to be -2 in 32 bits signed. > And I see type of UID (uid_t) is unsigned. And also, /usr/include/sys/conf.h:#define UID_NOBODY 65534
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