[Samba] Possible winbind bugs.
steve
steve at steve-ss.com
Thu Jul 10 07:51:36 MDT 2014
On Thu, 2014-07-10 at 19:20 +0800, Chan Min Wai wrote:
>
>
> On Thu, Jul 10, 2014 at 6:12 PM, steve <steve at steve-ss.com> wrote:
> On Thu, 2014-07-10 at 11:01 +0100, Rowland Penny wrote:
> > On 10/07/14 10:27, steve wrote:
> > > On Thu, 2014-07-10 at 13:25 +0800, Chan Min Wai wrote:
> > >> Dear All,
> > >>
> > >> I've found a strange behavior on Winbind + getent group
> > >>
> > >> If there are AD/winbind group didn't have any unix gid...
> > >> getent group will only show local group.
> > >>
> > >>
> > >> If all the AD/winbind group have unix gid
> > >> getent will reply with all the group I have included the
> AD/winbind group.
> > >>
> > >> Did we have any bugs reported on this?
> > >>
> > >> Thank You.
> > > Hi Chan
> > >
> > > Lots of confusion here.
> > >
> > > I don't think it's a bug because it would be reasonable to
> expect that
> > > if we wish domain groups to behave as posix groups, then
> we must play by
> > > posix rules and include a gid. Otherwise nss knows nothing
> about them.
> > >
> > > As we understand, must haves:
> > > Domain groups: gidNumber
> > > Domain users: uidNumber and gidNumber
> > Hi, I thought that, until it was pointed out that if you use
> winbind,
> > the users gidNumber is ignored and windbind pulls the
> gidnumber directly
> > from the primary group.
> >
> > So yes, the users primary group must have a gidNumber, but
> the user does
> > not need this added.
> >
> > Rowland
>
>
> Hi
> Yes, we agree. However, for completeness (and for those who do
> not use
> winbind) we mimic the Unix manner of obtaining the user's
> primary group:
> from the gidNumber listed in his DN.
> Just our translation of the evidence m'lud!
> Cheers
>
>
> Hi,
>
>
> What I meant is...
> When using winbind
>
>
> If there is even one AD Group without gid.
> "gentent group" will return only local unix Group
>
>
> Which shouldn't be right.
>
>
> "getent group" should return all AD Group except the AD group without
> gid.
> But our result here are different.
>
>
> I believes that when getent group happen
> winbind read a group without gid and it crash and return 0 to getent
> and thus
>
>
> getent group return only local unix group.
>
>
> You can easily try this by.
>
>
> You will want to turn winbind and idmap cache to as low as possible
> for fast result like 1 seconds
> like: (WARNING: Not to be use in actual production)
> idmap cache time = 1
> idmap negative cache time = 1
> winbind cache time = 1
>
>
> 1. Adding all AD group with unix gid
> 2. gentent group return all local unix group + AD Group (if you didn't
> try to get back to your AD group and add all unix gid)
> 3. Add one AD group without unix gid
> 4. gentent group return only local unix group
>
>
> Hope this explain...
>
Hi
Yes, sorry. I see what you mean now. Not had time to test, but if you
want this to work with winbind, you have to make:
objectClass: posixGroup
visible in the group DN.
Cheers,
Steve
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