[PATCH] disable nfsd (NFSv4) nobody/nogroup check

[Rick Macklem]

Marcelo Araujo wrote:
> 
> Hello Ronald and Blot,
> 
> 
> 
> Here is the patch with a small rework. I consider Ronaldo's comments
> as well as I just change a bit the code style.
> 
> 
> If you guys agree with the patch, I will commit it today.
> 
Looks fine to me.

> 
> Note: About the disable_utf8 that Rick has mention, I will rework
> that part later to make it as enable_utf8 instead of disable_utf8.
> 
If you do change this one, try to include something in the description
string w.r.t. RFC-3530 requires it to be enabled.

Thanks, rick

> 
> Best Regards,
> 
> 
> 2014-10-14 20:12 GMT+08:00 Marcelo Araujo < araujobsdport at gmail.com >
> :
> 
> 
> 
> Hello All,
> 
> 
> Before I commit it, I will double check what is the best way.
> Thanks Ronald to point it out.
> 
> 
> Best Regards,
> 
> 
> 
> 
> 2014-10-14 20:09 GMT+08:00 Rick Macklem < rmacklem at uoguelph.ca > :
> 
> 
> Ronald Klop wrote:
> > I thought it is advised to make settings positively defined. So not
> > use
> > 'disable = 1', but 'enable = 0'.
> > 
> For the case of disable_utf8, I made it negative, since disabling the
> check violates RFC-3530. For these checks, there isn't anything in
> the
> RFC requiring the check AFAIK, so I personally don't care which way
> they
> are done. (If the default is disabling the check that could be a
> minor POLA
> violation.)
> 
> So, you guys choose whichever you prefer to commit, rick
> 
> 
> 
> > Ronald.
> > 
> > 
> > On Tue, 14 Oct 2014 12:46:25 +0200, Marcelo Araujo
> > < araujobsdport at gmail.com > wrote:
> > 
> > > Hello Blot,
> > > 
> > > The patch looks reasonable.
> > > As per the email thread, seems a good approach to overcome this
> > > issue, at
> > > least for now.
> > > 
> > > If Rick has no objection and no free time, I can commit the patch
> > > during
> > > this week.
> > > 
> > > Best Regards,
> > > 
> > > 2014-10-14 18:34 GMT+08:00 Loïc Blot
> > > < loic.blot at unix-experience.fr >:
> > > 
> > >> Hi,
> > >> since a recent problem (see thread NFSv4 nobody issue), i think
> > >> we
> > >> need a
> > >> sysctl variable to disable nobody and nogroup check into the
> > >> kernel
> > >> (default enabled)
> > >> This variable is useful in some situations, like TFTP over NFS,
> > >> jails
> > >> over NFS (some files like /var/db/locate.database need nobody
> > >> user).
> > >> 
> > >> I added vfs.nfsd.disable_nobodycheck and
> > >> vfs.nfsd.disable_nogroupcheck
> > >> to
> > >> modify NFSv4 nobody/nogroup check.
> > >> 
> > >> Thanks to Rick to tell me where the problem was.
> > >> 
> > >> Can you review the patch, and add it to kernel to avoid previous
> > >> mentionned issue.
> > >> 
> > >> Here is my patch:
> > >> 
> > >> --- sys/fs/nfsserver/nfs_nfsdsubs.c.orig 2014-10-14
> > >> 12:03:50.163311506
> > >> +0200
> > >> +++ sys/fs/nfsserver/nfs_nfsdsubs.c 2014-10-14
> > >> 12:06:29.793304755
> > >> +0200
> > >> @@ -62,9 +62,18 @@
> > >> SYSCTL_DECL(_vfs_nfsd);
> > >> 
> > >> static int disable_checkutf8 = 0;
> > >> +static int disable_nobodycheck = 0;
> > >> +static int disable_nogroupcheck = 0;
> > >> SYSCTL_INT(_vfs_nfsd, OID_AUTO, disable_checkutf8, CTLFLAG_RW,
> > >> &disable_checkutf8, 0,
> > >> "Disable the NFSv4 check for a UTF8 compliant name");
> > >> +SYSCTL_INT(_vfs_nfsd, OID_AUTO, disable_nobodycheck,
> > >> CTLFLAG_RW,
> > >> + &disable_nobodycheck, 0,
> > >> + "Disable the NFSv4 check when setting user nobody as
> > >> owner");
> > >> +SYSCTL_INT(_vfs_nfsd, OID_AUTO, disable_nogroupcheck,
> > >> CTLFLAG_RW,
> > >> + &disable_nogroupcheck, 0,
> > >> + "Disable the NFSv4 check when setting group nogroup as
> > >> owner");
> > >> +
> > >> 
> > >> static char nfsrv_hexdigit(char, int *);
> > >> 
> > >> @@ -1543,8 +1552,8 @@
> > >> */
> > >> if (NFSVNO_NOTSETUID(nvap) && NFSVNO_NOTSETGID(nvap))
> > >> goto out;
> > >> - if ((NFSVNO_ISSETUID(nvap) && nvap->na_uid ==
> > >> nfsrv_defaultuid)
> > >> - || (NFSVNO_ISSETGID(nvap) && nvap->na_gid ==
> > >> nfsrv_defaultgid)) {
> > >> + if ((NFSVNO_ISSETUID(nvap) && nvap->na_uid ==
> > >> nfsrv_defaultuid &&
> > >> disable_nobodycheck == 0)
> > >> + || (NFSVNO_ISSETGID(nvap) && nvap->na_gid ==
> > >> nfsrv_defaultgid
> > >> &&
> > >> disable_nogroupcheck == 0)) {
> > >> error = NFSERR_BADOWNER;
> > >> goto out;
> > >> }
> > >> Regards,
> > >> 
> > >> Loïc Blot,
> > >> UNIX Systems, Network and Security Engineer
> > >> http://www.unix-experience.fr
> > >> _______________________________________________
> > >> freebsd-fs at freebsd.org mailing list
> > >> http://lists.freebsd.org/mailman/listinfo/freebsd-fs
> > >> To unsubscribe, send any mail to
> > >> " freebsd-fs-unsubscribe at freebsd.org "
> > > 
> > > 
> > > 
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> 
> 
> 
> 
> --
> 
> 
> 
> 
> --
> Marcelo Araujo            (__) araujo at FreeBSD.org \\\'',)
> http://www.FreeBSD.org \/  \ ^
> Power To Server.         .\. /_)
> 
> 
> 
> --
> 
> 
> 
> 
> --
> Marcelo Araujo            (__) araujo at FreeBSD.org \\\'',)
> http://www.FreeBSD.org \/  \ ^
> Power To Server.         .\. /_)