[Samba] bogus record in _msdcs zone in samba-dc
Alex
samba at abisoft.biz
Mon May 18 17:27:45 UTC 2020
>>> 2. Why can't I query and/or delete it using standard means?
>> Probably because it is a wrong record ????
>> Try running this on a DC:
>> ldbsearch --cross-ncs --show-binary -H /var/lib/samba/private/sam.ldb -b
>> 'DC=_msdcs.domain.com,CN=MicrosoftDNS,DC=ForestDnsZones,DC=domain,DC=com'
>> -s sub '(objectClass=dnsNode)'
> Thanks, Rowland. I've just tried your command but the output does not contain
> that bogus record. I even tried to remove the objectClass filter - still no
> luck.
One record I've finally found that looks suspicious:
# ldbsearch --cross-ncs --show-binary -H /usr/local/samba/private/sam.ldb -b 'DC=vm-dc4.domain.com.,DC=_msdcs.domain.com,CN=MicrosoftDNS,DC=ForestDnsZones,DC=domain,DC=com' -s sub
# record 1
dn: DC=vm-dc4.domain.com.,DC=_msdcs.domain.com,CN=MicrosoftDNS,DC=ForestDnsZones,DC=domain,DC=com
objectClass: top
objectClass: dnsNode
instanceType: 4
whenCreated: 20200318110215.0Z
whenChanged: 20200318110215.0Z
uSNCreated: 13282
uSNChanged: 13282
showInAdvancedViewOnly: TRUE
name: vm-dc4.domain.com.
objectGUID: 80170015-b113-4435-bb33-ba60f4f9f608
dnsRecord: NDR: struct dnsp_DnssrvRpcRecord
wDataLength : 0x0004 (4)
wType : DNS_TYPE_A (1)
version : 0x05 (5)
rank : DNS_RANK_GLUE (128)
flags : 0x0000 (0)
dwSerial : 0x000000b6 (182)
dwTtlSeconds : 0x00000e10 (3600)
dwReserved : 0x00000000 (0)
dwTimeStamp : 0x00000000 (0)
data : union dnsRecordData(case 1)
ipv4 : 172.26.1.84
objectCategory: CN=Dns-Node,CN=Schema,CN=Configuration,DC=domain,DC=com
dc: vm-dc4.domain.com.
distinguishedName: DC=vm-dc4.domain.com.,DC=_msdcs.domain.com,CN=MicrosoftDNS,DC=ForestDnsZones,DC=domain,DC=com
I considered it suspicious b/c no similar record exists for vm-dc1:
# ldbsearch --cross-ncs --show-binary -H /usr/local/samba/private/sam.ldb -b DC=vm-dc1.domain.com.,DC=_msdcs.domain.com,CN=MicrosoftDNS,DC=ForestDnsZones,DC=domain,DC=com -s sub
search error - No such Base DN: DC=vm-dc1.domain.com.,DC=_msdcs.domain.com,CN=MicrosoftDNS,DC=ForestDnsZones,DC=domain,DC=com
What do you think?
--
Best regards,
Alex
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