Samba4 loading schema.ldif

Gémes Géza geza at
Mon May 7 00:20:53 MDT 2012

On 2012-05-07 03:12, Matthieu Patou wrote:
> On 04/24/2012 03:04 PM, Gémes Géza wrote:
>> 2012-04-23 22:45 keltezéssel, Gémes Géza írta:
>>> Hello Matthieu,
>>>> On 04/23/2012 12:00 PM, Gémes Géza wrote:
>>>>> Hello Mat,
>>>>>>> Hello Geza,
>>>>>>>>>> I've seen, that your patches were merged in master, however
>>>>>>>>>> trying to
>>>>>>>>>> load the attached ldif (generated with patched oLschema2ldif
>>>>>>>>>> with
>>>>>>>>>> X-NDS_CONTAINMENT mods) still waxes the schema. Looking at the
>>>>>>>>>> modified
>>>>>>>>>> schema ldb it seems, that it still misses the oMObjectClass
>>>>>>>>>> attributes.
>>>>>>>>>> BTW I've overcome the name collision by applying the following
>>>>>>>>>> ldif:
>>>>>>>>>> dn: CN=DHCP-Class,CN=Schema,CN=Configuration,DC=kzsdabas,DC=hu
>>>>>>>>>> changetype: modify
>>>>>>>>>> replace: lDAPDisplayName
>>>>>>>>>> lDAPDisplayName: msdHCPClass
>>>>>>>>>> dn: CN=dhcp-Options,CN=Schema,CN=Configuration,DC=kzsdabas,DC=hu
>>>>>>>>>> changetype: modify
>>>>>>>>>> replace: lDAPDisplayName
>>>>>>>>>> lDAPDisplayName: msdhcpOptions
>>>>>>>>>> It probably makes MS DHCP Servers useless in the Domain, but I
>>>>>>>>>> do not
>>>>>>>>>> intend to have any MS servers anyway.
>>>>>>>>> Does this LDIF work against a Windows server?
>>>>>>>>> If we allow this in samba, we need to make sure that there are
>>>>>>>>> no instances of this classes and attributes in the directory,
>>>>>>>>> otherwise we'll get corruption.
>>>>>>>>> metze
>>>>>>>> Hi,
>>>>>>>> Before I would propose any inclusion or recommendation I'm
>>>>>>>> going to
>>>>>>>> test
>>>>>>>> it against a Windows 2008 R2 server.
>>>>>>>> BTW. I'm not really sure that this rename is needed at all,
>>>>>>>> because ISC
>>>>>>>> DHCP is looking for the cn attribute, and not the lDAPDisplayName.
>>>>>>> But that's not that simple, you can't have two attributes with the
>>>>>>> same ldapdisplayname, I'm really unsure that ISC is using just CN.
>>>>>>> When it creates and fetch object from the dhcp* classes it will
>>>>>>> check
>>>>>>> for attributes and those attributes have the ldapdisplayname of the
>>>>>>> schemaAttributes.
>>>>>>> That means that the ldapdisplayname is really important, more
>>>>>>> important than the CN in fact.
>>>>>>> My patches are at:
>>>>>>> It's not rebased on the latest version of master, I'll try to do it
>>>>>>> soon.
>>>>>> I really confirm that my setup with master
>>>>>> (5b5b696c1e36dc7f81da24158e0853290084dec8) is really working (once I
>>>>>> rename the two ldapdisplayname of MS attributes):
>>>>>> ./bin/ldbmodify -H ldap:// -U administrator%totoTATA123
>>>>>> ~/dhcp3.ldif
>>>>>> Modified 76 records successfully
>>>>>> After loading the schema, I can search the database not only the
>>>>>> schema is not toasted but newly created classes are here.
>>>>>> ./bin/ldbsearch -H ldap:// -U administrator%totoTATA123
>>>>>> --cross-ncs '(ldapdisplayname=dhcppo*)' dn
>>>>>> # record 1
>>>>>> dn: CN=dhcpPool6,CN=Schema,CN=Configuration,DC=home,DC=matws,DC=net
>>>>>> # record 2
>>>>>> dn: CN=dhcpPoolDN,CN=Schema,CN=Configuration,DC=home,DC=matws,DC=net
>>>>>> # record 3
>>>>>> dn: CN=dhcpPool,CN=Schema,CN=Configuration,DC=home,DC=matws,DC=net
>>>>>> I didn't try to do anything useful but I expect this to work.
>>>>>> Matthieu.
>>>>> Thank you for the hard work you we put into this.
>>>>> Could you tell me when will your patches be merged to master, or
>>>>> which
>>>>> one (981fe20523dd9c0bffa4ffb6037e690b8947b6d6 and
>>>>> b5649e6d0f50ec253e20e86fed9fd506716c4209 maybe?) of your unmerged
>>>>> patches should I try out.
>>>> Well first as I said it works well with master for me so maybe there
>>>> is something wrong for you, can you retry with a fresh provision just
>>>> to see.
>>>> Then you'd better off trying the whole branch as I don't think patches
>>>> will apply very well.
>>>> Matthieu.
>>> Will try it with a fresh provision (I was and still am on master (used
>>> to rebuild in the evening)) (was on an upgraded samba3). But before
>>> that
>>> I try to fix oLschema2ldif.
>>> Cheers
>>> Geza
>> Hi,
>> After some fight against the current master (it wouldn't build) I've
>> fixed oLschema2ldif to generate PossSuperiors without apostrophes.
>> The patch is attached.
>> After experimenting with the possibility of rename of lDAPDisplayName's
>> to something isc-..., if it goes well I intend to add another option to
>> oLschema2ldif, something like --ldapnameprefix=... which would then be
>> prepended to the attribute resulting from NAME.
> So finally with your patch you are able to load the file right and it
> didn't trash your schema ?
> Are you able to make something useful out of it ?
> Matthieu.
Hi Matthieu,

It is working, but as Metze pointed out, and I've tested the necessary
schema modifications (renaming ldapDisplayName of dhcpClass and
dhcpOption) against win2008R2 it was reporting an unwilling to perform
error. So yes the fixes are working in general, just not in case where
there is a schema conflict.
I've started modifying ISC DHCP LDAP support in order to use attributes
with the name prefixed by isc to avoid any future conflicts.



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