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Re: [Samba] [Patches] for dbcheck (Re: [Patches] AD Database corruption after upgrade from <= 4.6 to 4.7 (bug #13228))




Hi Stefan

I am also one of the Sernet customer. Can you guide me how to run the patch
to fix the bug.

I am running 2 DC's Sernet Samba 4.7.4 with 2 RODC's running Sernet Samba
4.7.4. Whenever I run samba-tool drs replicate --fix --yes command on the
DC it shows the below errors which cannot be fixed:

Failed to remove deleted DN attribute fromServer : (65, "objectclass_attrs:
at least one mandatory attribute ('fromServer') on entry
'CN=79fbbaa2-a6b5-4dfd-a7f4-26aaa568f74e,CN=LostAndFoundConfig,CN=Configuration,DC=iumnet,DC=edu,DC=na'
wasn't specified!")
ERROR: no target object found for GUID component for link lastKnownParent
in object
CN=79fbbaa2-a6b5-4dfd-a7f4-26aaa568f74e,CN=LostAndFoundConfig,CN=Configuration,DC=iumnet,DC=edu,DC=na
- <GUID=fbd5524d-78fb-4313-a62a-96dc802dd9e2>;CN=NTDS
Settings\0ADEL:fbd5524d-78fb-4313-a62a-96dc802dd9e2,CN=LostAndFoundConfig,CN=Configuration,DC=iumnet,DC=edu,DC=na
ERROR: target DN is deleted for lastKnownParent in object
CN=79fbbaa2-a6b5-4dfd-a7f4-26aaa568f74e,CN=LostAndFoundConfig,CN=Configuration,DC=iumnet,DC=edu,DC=na
- <GUID=fbd5524d-78fb-4313-a62a-96dc802dd9e2>;CN=NTDS
Settings\0ADEL:fbd5524d-78fb-4313-a62a-96dc802dd9e2,CN=LostAndFoundConfig,CN=Configuration,DC=iumnet,DC=edu,DC=na
Target GUID points at deleted DN
'<GUID=fbd5524d-78fb-4313-a62a-96dc802dd9e2>;CN=NTDS
Settings\\0ADEL:fbd5524d-78fb-4313-a62a-96dc802dd9e2,CN=LostAndFoundConfig,CN=Configuration,DC=iumnet,DC=edu,DC=na'
Remove DN link? [YES]
Failed to remove deleted DN attribute lastKnownParent : (65,
"objectclass_attrs: at least one mandatory attribute ('fromServer') on
entry
'CN=79fbbaa2-a6b5-4dfd-a7f4-26aaa568f74e,CN=LostAndFoundConfig,CN=Configuration,DC=iumnet,DC=edu,DC=na'
wasn't specified!")
WARNING: no target object found for GUID component for DN value fromServer
in object
CN=6eba8ddc-5f5b-4bf5-8025-772ec80a29e2,CN=LostAndFoundConfig,CN=Configuration,DC=iumnet,DC=edu,DC=na
- <GUID=3da7e1da-33b5-428b-9313-2ae48ddfee10>;CN=NTDS
Settings,CN=IUMONGDC,CN=Servers,CN=Default-First-Site-Name,CN=Sites,CN=Configuration,DC=iumnet,DC=edu,DC=na
WARNING: target DN is deleted for fromServer in object
CN=6eba8ddc-5f5b-4bf5-8025-772ec80a29e2,CN=LostAndFoundConfig,CN=Configuration,DC=iumnet,DC=edu,DC=na
- <GUID=3da7e1da-33b5-428b-9313-2ae48ddfee10>;CN=NTDS
Settings,CN=IUMONGDC,CN=Servers,CN=Default-First-Site-Name,CN=Sites,CN=Configuration,DC=iumnet,DC=edu,DC=na
Target GUID points at deleted DN
'<GUID=3da7e1da-33b5-428b-9313-2ae48ddfee10>;CN=NTDS
Settings,CN=IUMONGDC,CN=Servers,CN=Default-First-Site-Name,CN=Sites,CN=Configuration,DC=iumnet,DC=edu,DC=na'
Remove stale DN link? [YES]
Failed to remove deleted DN attribute fromServer : (65, "objectclass_attrs:
at least one mandatory attribute ('fromServer') on entry
'CN=6eba8ddc-5f5b-4bf5-8025-772ec80a29e2,CN=LostAndFoundConfig,CN=Configuration,DC=iumnet,DC=edu,DC=na'
wasn't specified!")
ERROR: no target object found for GUID component for link lastKnownParent
in object
CN=6eba8ddc-5f5b-4bf5-8025-772ec80a29e2,CN=LostAndFoundConfig,CN=Configuration,DC=iumnet,DC=edu,DC=na
- <GUID=fbd5524d-78fb-4313-a62a-96dc802dd9e2>;CN=NTDS
Settings\0ADEL:fbd5524d-78fb-4313-a62a-96dc802dd9e2,CN=LostAndFoundConfig,CN=Configuration,DC=iumnet,DC=edu,DC=na
ERROR: target DN is deleted for lastKnownParent in object
CN=6eba8ddc-5f5b-4bf5-8025-772ec80a29e2,CN=LostAndFoundConfig,CN=Configuration,DC=iumnet,DC=edu,DC=na
- <GUID=fbd5524d-78fb-4313-a62a-96dc802dd9e2>;CN=NTDS
Settings\0ADEL:fbd5524d-78fb-4313-a62a-96dc802dd9e2,CN=LostAndFoundConfig,CN=Configuration,DC=iumnet,DC=edu,DC=na
Target GUID points at deleted DN
'<GUID=fbd5524d-78fb-4313-a62a-96dc802dd9e2>;CN=NTDS
Settings\\0ADEL:fbd5524d-78fb-4313-a62a-96dc802dd9e2,CN=LostAndFoundConfig,CN=Configuration,DC=iumnet,DC=edu,DC=na'
Remove DN link? [YES]
Failed to remove deleted DN attribute lastKnownParent : (65,
"objectclass_attrs: at least one mandatory attribute ('fromServer') on
entry
'CN=6eba8ddc-5f5b-4bf5-8025-772ec80a29e2,CN=LostAndFoundConfig,CN=Configuration,DC=iumnet,DC=edu,DC=na'
wasn't specified!")
Checked 5920 objects (13 errors)

Can you please suggest if this patch is going to fix these errors.

Thanks n Regards

Harsh

*Harsh Kukreja *Systems Administrator
*International University of Namibia *Tel: 061-4336000 - E-mail: h.kukreja
@ium.edu.na - Web:
*http://www.ium.edu.na <http://www.ium.edu.na/>*Private Bag
14005,Bachbrech. 21-31 Hercules Street, Dorado Park, Windhoek, NAMIBIA






On Tue, Jan 30, 2018 at 8:56 PM, Stefan Metzmacher via samba <
samba@xxxxxxxxxxxxxxx> wrote:

> Hi,
>
> as a lot of SerNet customers are having trouble with corrupted
> linked attributes, my colleague Ralph Böhme and I developed
> patches for 'samba-tool dbcheck' to recover the missing
> forward links (in most cases missing member attributes).
>
> I'm currently running a private autobuild with these patches
> and my colleague Björn Baumbach is currently testing SAMBA+
> packages with the patches included, which will be released
> as soon as possible.
>
> As the patches re-add members to groups administrators may want
> avoid using '--yes' and ack the re-added members explicitly.
>
> The patches have enough review tags already, additional
> review isn't required, we'll wait a bit to collect some feedback
> from others, before pushing.
>
> Once the patches are reviewed for master, we'll also release
> a new upstream 4.7 release with the fixes included.
>
> More technical details:
>
> As we lost the replication meta data for the forward link,
> we create them using a special invocationId
> ffffffff-4700-4700-4700-000000b13228 and an originating_usn
> of 1. The add/changetime/local_usn are the one from the last
> 'objectClass' modification (which typically never changes and therefor
> matches the object creation time). We also use version = 0
> in order to match the link creation of 4.7 and older releases.
>
> This way we can easily identify recreated forward links
> and we avoid a new meta data stamp and incrementing of
> the highestCommitedUSN. So each affected dc will just recover
> the value in the local database. And any incoming
> replication should overwrite the value again.
>
> See also https://bugzilla.samba.org/show_bug.cgi?id=13228
>
> metze
>
> Am 22.01.2018 um 10:49 schrieb Stefan Metzmacher via samba-technical:
> > Hi,
> >
> > here're patches to avoid a database corruption with linked attributes,
> > e.g. member/memberOf.
> >
> > See https://bugzilla.samba.org/show_bug.cgi?id=13228
> >
> > As a temporary solution admins can add "server services = -kcc" to the
> > global section of smb.conf.
> >
> > Also DO NOT repair the following errors with samba-tool dbcheck!
> > "Remove duplicate links in attribute"
> > and
> > "ERROR: orphaned backlink"
> > as this removes the ability to repair the database
> > in the next round of patches!
> >
> > Please review and push:-)
> >
> > Thanks!
> > metze
> >
>
>
>
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