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Date: | Fri, 4 Aug 2023 01:38:42 +0200 |
Message-ID: | <CANH4o6M9c2PsezGYSpFvKc0HUS2=9vCpTgZ3JXYqRjFeH65mdA@mail.gmail.com> |
Subject: | Re: ms-nfs41 mount: Where does Unix_User+0 and Unix_Group+0 come from? |
To: | ms-nfs41-client-devel AT lists DOT sourceforge DOT net, cygwin AT cygwin DOT com |
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From: | Martin Wege via Cygwin <cygwin AT cygwin DOT com> |
Reply-To: | Martin Wege <martin DOT l DOT wege AT gmail DOT com> |
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On Fri, Aug 4, 2023 at 1:07 AM Martin Wege <martin DOT l DOT wege AT gmail DOT com> wrote: > > On Thu, Aug 3, 2023 at 8:46 PM Martin Wege <martin DOT l DOT wege AT gmail DOT com> wrote: > > > > Hello, > > > > We are working to deploy the ms-nfs41-nfs-filesystem on our Windows > > machines, and encounter some issues with Cygwin (latest stable). > > > > For example, if we go to the ms-nfs41-nfs-filesystem (not the NFS > > version 3 client from Windows!!!) with cd X: ; cd tmp/data9/, and do a > > ls -l we get 'Unix_User+0' and 'Unix_Group+0' for user and group > > names. > > The question is: Where do these names come from - Windows, > > ms-nfs41-nfs-filesystem or Cygwin? > > getent passwd and getent group do not list this on Cygwin. > > NFS version 4 server "lordbatman" has user mlw=uid(3620) and group mlw=gid(3620) > > > > Steps to reproduce: > > 1. Download and install cygwin. > > 2. Download http://www.citi.umich.edu/projects/nfsv4/windows/120612/ > > and install it. > > 3. Start NFS version 4 client daemon: > > ms-nfs41-client-x64/nfsd_debug.exe -d 3 --noldap --gid 3620 --uid 3620 > > 4. Mount NFS version 4 directory: > > ms-nfs41-client-x64/ms-nfs41-client-x64/nfs_mount.exe -p -o sec=sys X > > 'lordbatman.bias.dfn.de:/export/home/mlw' > > > > Expectation: > > Cygwin ls -l should list file user/group as mlw/mlw > > > > Actual results: > > Cygwin ls -l lists file user/group as Unix_User+0/Unix_Group+0 > > Did a cygwin source clone, and found this: > cygwin$ grep -r -E 'Unix_(User|Group)' . > ./newlib-cygwin/winsup/utils/mkgroup.c: "Unix_Group", > ./newlib-cygwin/winsup/utils/mkgroup.c: "Unix_Group", > ./newlib-cygwin/winsup/utils/mkpasswd.c: "Unix_User", > ./newlib-cygwin/winsup/utils/mkpasswd.c: > > But I do not understand this code. In which cases are Unix_User+0 and > Unix_Group+0 used? It just got more mysterious. I tried a ls -nl (uid, gid as numbers, not names from /etc/passwd and /etc/group), and got this: ls -nl total 78474 -rwxr-xr-x 1 4278190080 4278190080 33063 Aug 3 12:02 CMakeCache.txt drwxr-xr-x 1 4278190080 4278190080 374 Aug 3 12:51 CMakeFiles -rwxr-xr-x 1 4278190080 4278190080 4790 Aug 3 12:02 CPackConfig.cmake -rwxr-xr-x 1 4278190080 4278190080 5276 Aug 3 12:02 CPackSourceConfig.cmake -rwxr-xr-x 1 4278190080 4278190080 440 Aug 3 12:03 CTestTestfile.cmake -rwxr-xr-x 1 4278190080 4278190080 77004 Aug 3 12:03 Makefile So where does the "4278190080" come from, for uid and gid? Hexadecimal its 0xff000000, which might be related to this: ./newlib-cygwin/winsup/cygwin/local_includes/security.h /* For UNIX accounts not mapped to Windows accounts via winbind, Samba returns SIDs of the form S-1-22-x-y, with x == 1 for users and x == 2 for groups, and y == UNIX uid/gid. NFS returns no SIDs at all, but the plain UNIX uid/gid values. UNIX uid/gid values are mapped to Cygwin uid/gid values 0xff000000 + unix uid/gid. This *might* collide with a posix_offset of some trusted domain, but it's *very* unlikely. Define the mapping as macro. */ #define UNIX_POSIX_OFFSET (0xff000000) #define UNIX_POSIX_MASK (0x00ffffff) #define MAP_UNIX_TO_CYGWIN_ID(id) (UNIX_POSIX_OFFSET \ | ((id) & UNIX_POSIX_MASK)) But why is it then Unix_User+0 and not Unix_User+3620 on Windows NFS? Same for Unix_Group+0 vs Unix_Group+3620? Martin -- Problem reports: https://cygwin.com/problems.html FAQ: https://cygwin.com/faq/ Documentation: https://cygwin.com/docs.html Unsubscribe info: https://cygwin.com/ml/#unsubscribe-simple
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