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Rowland Penny

2016-Sep-12 19:47 UTC

[Samba] Phantom DNS records visible with dig, but not samba-tool dns

On Mon, 12 Sep 2016 15:41:24 -0400
lingpanda101--- via samba <samba at lists.samba.org> wrote:
> On 9/12/2016 3:23 PM, ash-samba--- via samba wrote:
> > On 09/09/16 16:35, lingpanda101--- via samba wrote:
> >> On 9/9/2016 10:59 AM, ash-samba--- via samba wrote:
> >>> We appear to have some phantom DNS records on both our domain
> >>> controllers.
> >>> [...]
> >>> # dig _ldap._tcp.dc._msdcs.chester-dc.example.com srv
@10.4.4.155
> >>> [...]
> >>>
> >>
> >> For me I had to use ADSI edit to remove the entries.
> >>
> > I've managed to locate the entries using ADSI edit ( for any
future
> > archive readers, open ADSI edit, and then connect using
> > "DC=ForestDCZones,dc=chester-dc,dc=example,dc=com" as the
naming
> > context, the records are under CN=MicrosoftDNS).
> >
> > The thing is, if I open, say DC=_ldap._tcp.dc and then look at
> > dnsRecord the entries are using some kind of encoding (a series of
> > backslash prefixed 2 digit hex values).
> >
> > I'm unsure which records to delete, and I'm somewhat concerned
about
> > experimenting since I can't clearly tell what is going on with the
> > regular tools (AD DNS/samba-tool). A possibly greater problem is
> > that I can't actually search to see which records need
modification.
> >
> > Will there be any impact if I just leave the corrupt records in
> > place?
> >
> > Are there any tools to automate fixing things?
> >
> > Thanks,
> >
> >
> >
> 
> I see what you mean by the value of DNS. That's normal. It's in
> hexadecimal.
> 
Not if you you know what tool to use, where to use it and the magic
incantation ;-)

# editing 1 records
# record 1
dn:
DC=_ldap._tcp.pdc,DC=_msdcs.samdom.example.com,CN=MicrosoftDNS,DC=ForestDnsZones,DC=samdom,DC=example,DC=com
objectClass: top
objectClass: dnsNode
instanceType: 4
whenCreated: 20151106115626.0Z
whenChanged: 20151106115626.0Z
uSNCreated: 3683
uSNChanged: 3683
showInAdvancedViewOnly: TRUE
name: _ldap._tcp.pdc
objectGUID: 77be2b80-e5c7-46bb-a410-7d7c5c02efa7
dnsRecord:     NDR: struct dnsp_DnssrvRpcRecord
        wDataLength              : 0x0020 (32)
        wType                    : DNS_TYPE_SRV (33)
        version                  : 0x05 (5)
        rank                     : DNS_RANK_ZONE (240)
        flags                    : 0x0000 (0)
        dwSerial                 : 0x00000001 (1)
        dwTtlSeconds             : 0x00000384 (900)
        dwReserved               : 0x00000000 (0)
        dwTimeStamp              : 0x00000000 (0)
        data                     : union dnsRecordData(case 33)
        srv: struct dnsp_srv
            wPriority                : 0x0000 (0)
            wWeight                  : 0x0064 (100)
            wPort                    : 0x0185 (389)
            nameTarget               : dc1.samdom.example.com

objectCategory:
CN=Dns-Node,CN=Schema,CN=Configuration,DC=samdom,DC=example,DC=com
dc: _ldap._tcp.pdc
distinguishedName:
DC=_ldap._tcp.pdc,DC=_msdcs.samdom.example.com,CN=MicrosoftDNS,DC=ForestDnsZones,DC=samdom,DC=example,DC=com

And to get it editable:

ldbedit -e nano -H /usr/local/samba/private/sam.ldb --cross-ncs
--show-binary -b
'DC=_ldap._tcp.pdc,DC=_msdcs.samdom.example.com,CN=MicrosoftDNS,DC=ForestDnsZones,DC=samdom,DC=example,DC=com'
-s base

All on one line, run on a DC.

Rowland

ash-samba at comtek.co.uk

2016-Sep-12 20:21 UTC

head link

[Samba] Phantom DNS records visible with dig, but not samba-tool dns

On 12/09/16 20:47, Rowland Penny via samba wrote:> On Mon, 12 Sep 2016 15:41:24 -0400
> lingpanda101--- via samba <samba at lists.samba.org> wrote:
>
>> On 9/12/2016 3:23 PM, ash-samba--- via samba wrote:
>>> On 09/09/16 16:35, lingpanda101--- via samba wrote:
>>>> On 9/9/2016 10:59 AM, ash-samba--- via samba wrote:
>>>>> We appear to have some phantom DNS records on both our
domain
[...]>>>>> And to get it editable:
>>>>>
>>>>> ldbedit -e nano -H /usr/local/samba/private/sam.ldb
--cross-ncs
>>>>> --show-binary -b
>>>>>
'DC=_ldap._tcp.pdc,DC=_msdcs.samdom.example.com,CN=MicrosoftDNS,DC=ForestDnsZones,DC=samdom,DC=example,DC=com'
>>>>> -s base
>>>>>
>>>>> All on one line, run on a DC.
>>>>>
>>>>> Rowland
>>>>>
Okay, thanks.

I'd love to know how it got into this state, though.

The idea of tampering with a potentially corrupt AD scares me; I think 
perhaps I'm going to snapshot the domain controllers before I do it!

ash-samba at comtek.co.uk

2016-Sep-13 14:20 UTC

head link

[Samba] Phantom DNS records visible with dig, but not samba-tool dns

> And to get it editable:
>
> ldbedit -e nano -H /usr/local/samba/private/sam.ldb --cross-ncs
> --show-binary -b
>
'DC=_ldap._tcp.pdc,DC=_msdcs.samdom.example.com,CN=MicrosoftDNS,DC=ForestDnsZones,DC=samdom,DC=example,DC=com'
> -s base
>
> All on one line, run on a DC.
>
> RowlandThe problem is that when I save and exit (even if I make no ldif 
changes), I get:

    Error: First line of ldif must be a dn not 'dnsRecord'

I get this even if I'm editing a seemingly valid DNS record.

The broken record is:

# editing 1 records
# record 1
dn:
DC=_ldap._tcp.dc,DC=_msdcs.chester-dc.example.com,CN=MicrosoftDNS,DC=ForestDnsZones,DC=chester-dc,DC=example,DC=com
objectClass: top
objectClass: dnsNode
instanceType: 4
whenCreated: 20140528144629.0Z
uSNCreated: 18305
showInAdvancedViewOnly: TRUE
name: _ldap._tcp.dc
objectGUID: bf3c8f60-48d9-43d4-a6a3-d724352ae8e9
objectCategory:
CN=Dns-Node,CN=Schema,CN=Configuration,DC=chester-dc,DC=example,DC=com
dc: _ldap._tcp.dc
dnsRecord:     NDR: struct dnsp_DnssrvRpcRecord
         wDataLength              : 0x0028 (40)
         wType                    : DNS_TYPE_SRV (33)
         version                  : 0x05 (5)
         rank                     : DNS_RANK_ZONE (240)
         flags                    : 0x0000 (0)
         dwSerial                 : 0x0000006e (110)
         dwTtlSeconds             : 0x00000384 (900)
         dwReserved               : 0x00000000 (0)
         dwTimeStamp              : 0x00000000 (0)
         data                     : union dnsRecordData(case 33)
         srv: struct dnsp_srv
             wPriority                : 0x0000 (0)
             wWeight                  : 0x0064 (100)
             wPort                    : 0x0185 (389)
             nameTarget               : HAWAII.chester-dc.example.com

dnsRecord:     NDR: struct dnsp_DnssrvRpcRecord
         wDataLength              : 0x0028 (40)
         wType                    : DNS_TYPE_SRV (33)
         version                  : 0x05 (5)
         rank                     : DNS_RANK_ZONE (240)
         flags                    : 0x0000 (0)
         dwSerial                 : 0x0000006e (110)
         dwTtlSeconds             : 0x00000384 (900)
         dwReserved               : 0x00000000 (0)
         dwTimeStamp              : 0x00000000 (0)
         data                     : union dnsRecordData(case 33)
         srv: struct dnsp_srv
             wPriority                : 0x0000 (0)
             wWeight                  : 0x0064 (100)
             wPort                    : 0x0185 (389)
             nameTarget               : ALASKA.chester-dc.example.com

dnsRecord:     NDR: struct dnsp_DnssrvRpcRecord
         wDataLength              : 0x0028 (40)
         wType                    : DNS_TYPE_SRV (33)
         version                  : 0x05 (5)
         rank                     : DNS_RANK_ZONE (240)
         flags                    : 0x0000 (0)
         dwSerial                 : 0x0000006e (110)
         dwTtlSeconds             : 0x00000000 (0)
         dwReserved               : 0x00000000 (0)
         dwTimeStamp              : 0x00378ff8 (3641336)
         data                     : union dnsRecordData(case 33)
         srv: struct dnsp_srv
             wPriority                : 0x0000 (0)
             wWeight                  : 0x0064 (100)
             wPort                    : 0x0185 (389)
             nameTarget               : v-fief.chester-dc.example.com

dnsRecord:     NDR: struct dnsp_DnssrvRpcRecord
         wDataLength              : 0x0028 (40)
         wType                    : DNS_TYPE_SRV (33)
         version                  : 0x05 (5)
         rank                     : DNS_RANK_NONE (0)
         flags                    : 0x0000 (0)
         dwSerial                 : 0x0000006e (110)
         dwTtlSeconds             : 0x00000000 (0)
         dwReserved               : 0x00000000 (0)
         dwTimeStamp              : 0x0d5895fd (223909373)
         data                     : union dnsRecordData(case 33)
         srv: struct dnsp_srv
             wPriority                : 0x0000 (0)
             wWeight                  : 0x0064 (100)
             wPort                    : 0x0185 (389)
             nameTarget               : v-ward.chester-dc.example.com

dnsRecord:     NDR: struct dnsp_DnssrvRpcRecord
         wDataLength              : 0x0021 (33)
         wType                    : DNS_TYPE_SRV (33)
         version                  : 0x05 (5)
         rank                     : DNS_RANK_NONE (0)
         flags                    : 0x0000 (0)
         dwSerial                 : 0x0000006e (110)
         dwTtlSeconds             : 0x00000000 (0)
         dwReserved               : 0x00000000 (0)
         dwTimeStamp              : 0x0de21bb2 (232922034)
         data                     : union dnsRecordData(case 33)
         srv: struct dnsp_srv
             wPriority                : 0x0000 (0)
             wWeight                  : 0x0064 (100)
             wPort                    : 0x0185 (389)
             nameTarget               : v-ward.chester-dc.co.uk

dnsRecord:     NDR: struct dnsp_DnssrvRpcRecord
         wDataLength              : 0x001b (27)
         wType                    : DNS_TYPE_SRV (33)
         version                  : 0x05 (5)
         rank                     : DNS_RANK_NONE (0)
         flags                    : 0x0000 (0)
         dwSerial                 : 0x0000006e (110)
         dwTtlSeconds             : 0x00000000 (0)
         dwReserved               : 0x00000000 (0)
         dwTimeStamp              : 0x0de21c35 (232922165)
         data                     : union dnsRecordData(case 33)
         srv: struct dnsp_srv
             wPriority                : 0x0000 (0)
             wWeight                  : 0x0064 (100)
             wPort                    : 0x0185 (389)
             nameTarget               : v-ward.chester-dc

whenChanged: 20160908160654.0Z
uSNChanged: 33473
distinguishedName:
DC=_ldap._tcp.dc,DC=_msdcs.chester-dc.example.com,CN=MicrosoftDNS,DC=ForestDnsZones,DC=chester-dc,DC=example,DC=com

Rowland Penny

2016-Sep-13 14:51 UTC

head link

[Samba] Phantom DNS records visible with dig, but not samba-tool dns

On Tue, 13 Sep 2016 15:20:29 +0100
ash-samba--- via samba <samba at lists.samba.org> wrote:
> > And to get it editable:
> >
> > ldbedit -e nano -H /usr/local/samba/private/sam.ldb --cross-ncs
> > --show-binary -b
> >
'DC=_ldap._tcp.pdc,DC=_msdcs.samdom.example.com,CN=MicrosoftDNS,DC=ForestDnsZones,DC=samdom,DC=example,DC=com'
> > -s base
> >
> > All on one line, run on a DC.
> >
> > Rowland
> The problem is that when I save and exit (even if I make no ldif 
> changes), I get:
> 
>     Error: First line of ldif must be a dn not 'dnsRecord'
> 
> I get this even if I'm editing a seemingly valid DNS record.
> 
> The broken record is:
> 
> # editing 1 records
> # record 1
> dn:
>
DC=_ldap._tcp.dc,DC=_msdcs.chester-dc.example.com,CN=MicrosoftDNS,DC=ForestDnsZones,DC=chester-dc,DC=example,DC=com
> objectClass: top objectClass: dnsNode
> instanceType: 4
> whenCreated: 20140528144629.0Z
> uSNCreated: 18305
> showInAdvancedViewOnly: TRUE
> name: _ldap._tcp.dc
> objectGUID: bf3c8f60-48d9-43d4-a6a3-d724352ae8e9
> objectCategory:
> CN=Dns-Node,CN=Schema,CN=Configuration,DC=chester-dc,DC=example,DC=com
> dc: _ldap._tcp.dc dnsRecord:     NDR: struct dnsp_DnssrvRpcRecord
>          wDataLength              : 0x0028 (40)
>          wType                    : DNS_TYPE_SRV (33)
>          version                  : 0x05 (5)
>          rank                     : DNS_RANK_ZONE (240)
>          flags                    : 0x0000 (0)
>          dwSerial                 : 0x0000006e (110)
>          dwTtlSeconds             : 0x00000384 (900)
>          dwReserved               : 0x00000000 (0)
>          dwTimeStamp              : 0x00000000 (0)
>          data                     : union dnsRecordData(case 33)
>          srv: struct dnsp_srv
>              wPriority                : 0x0000 (0)
>              wWeight                  : 0x0064 (100)
>              wPort                    : 0x0185 (389)
>              nameTarget               : HAWAII.chester-dc.example.com
> 
> dnsRecord:     NDR: struct dnsp_DnssrvRpcRecord
>          wDataLength              : 0x0028 (40)
>          wType                    : DNS_TYPE_SRV (33)
>          version                  : 0x05 (5)
>          rank                     : DNS_RANK_ZONE (240)
>          flags                    : 0x0000 (0)
>          dwSerial                 : 0x0000006e (110)
>          dwTtlSeconds             : 0x00000384 (900)
>          dwReserved               : 0x00000000 (0)
>          dwTimeStamp              : 0x00000000 (0)
>          data                     : union dnsRecordData(case 33)
>          srv: struct dnsp_srv
>              wPriority                : 0x0000 (0)
>              wWeight                  : 0x0064 (100)
>              wPort                    : 0x0185 (389)
>              nameTarget               : ALASKA.chester-dc.example.com
> 
> dnsRecord:     NDR: struct dnsp_DnssrvRpcRecord
>          wDataLength              : 0x0028 (40)
>          wType                    : DNS_TYPE_SRV (33)
>          version                  : 0x05 (5)
>          rank                     : DNS_RANK_ZONE (240)
>          flags                    : 0x0000 (0)
>          dwSerial                 : 0x0000006e (110)
>          dwTtlSeconds             : 0x00000000 (0)
>          dwReserved               : 0x00000000 (0)
>          dwTimeStamp              : 0x00378ff8 (3641336)
>          data                     : union dnsRecordData(case 33)
>          srv: struct dnsp_srv
>              wPriority                : 0x0000 (0)
>              wWeight                  : 0x0064 (100)
>              wPort                    : 0x0185 (389)
>              nameTarget               : v-fief.chester-dc.example.com
> 
> dnsRecord:     NDR: struct dnsp_DnssrvRpcRecord
>          wDataLength              : 0x0028 (40)
>          wType                    : DNS_TYPE_SRV (33)
>          version                  : 0x05 (5)
>          rank                     : DNS_RANK_NONE (0)
>          flags                    : 0x0000 (0)
>          dwSerial                 : 0x0000006e (110)
>          dwTtlSeconds             : 0x00000000 (0)
>          dwReserved               : 0x00000000 (0)
>          dwTimeStamp              : 0x0d5895fd (223909373)
>          data                     : union dnsRecordData(case 33)
>          srv: struct dnsp_srv
>              wPriority                : 0x0000 (0)
>              wWeight                  : 0x0064 (100)
>              wPort                    : 0x0185 (389)
>              nameTarget               : v-ward.chester-dc.example.com
> 
> dnsRecord:     NDR: struct dnsp_DnssrvRpcRecord
>          wDataLength              : 0x0021 (33)
>          wType                    : DNS_TYPE_SRV (33)
>          version                  : 0x05 (5)
>          rank                     : DNS_RANK_NONE (0)
>          flags                    : 0x0000 (0)
>          dwSerial                 : 0x0000006e (110)
>          dwTtlSeconds             : 0x00000000 (0)
>          dwReserved               : 0x00000000 (0)
>          dwTimeStamp              : 0x0de21bb2 (232922034)
>          data                     : union dnsRecordData(case 33)
>          srv: struct dnsp_srv
>              wPriority                : 0x0000 (0)
>              wWeight                  : 0x0064 (100)
>              wPort                    : 0x0185 (389)
>              nameTarget               : v-ward.chester-dc.co.uk
> 
> dnsRecord:     NDR: struct dnsp_DnssrvRpcRecord
>          wDataLength              : 0x001b (27)
>          wType                    : DNS_TYPE_SRV (33)
>          version                  : 0x05 (5)
>          rank                     : DNS_RANK_NONE (0)
>          flags                    : 0x0000 (0)
>          dwSerial                 : 0x0000006e (110)
>          dwTtlSeconds             : 0x00000000 (0)
>          dwReserved               : 0x00000000 (0)
>          dwTimeStamp              : 0x0de21c35 (232922165)
>          data                     : union dnsRecordData(case 33)
>          srv: struct dnsp_srv
>              wPriority                : 0x0000 (0)
>              wWeight                  : 0x0064 (100)
>              wPort                    : 0x0185 (389)
>              nameTarget               : v-ward.chester-dc
> 
> whenChanged: 20160908160654.0Z
> uSNChanged: 33473
> distinguishedName:
>
DC=_ldap._tcp.dc,DC=_msdcs.chester-dc.example.com,CN=MicrosoftDNS,DC=ForestDnsZones,DC=chester-dc,DC=example,DC=com
> 
> 
> 
Now you have identified what the records, you should be able to remove
the required records with samba-tool, for instance, if you wanted to
remove the record for ' HAWAII', try this:

samba-tool dns delete 127.0.0.1 _msdcs.chester-dc.example.com
_ldap._tcp.dc SRV  'HAWAII.chester-dc.example.com 389 0 100'

Rowland

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