Bug 13756 - DNS (BIND9_DLZ) incorrect wildcard record
DNS (BIND9_DLZ) incorrect wildcard record
Status: NEW
Product: Samba 4.1 and newer
Classification: Unclassified
Component: DNS server
4.9.2
All All
: P5 normal
: ---
Assigned To: Kai Blin
Samba QA Contact
:
Depends on:
Blocks:
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Reported: 2019-01-21 13:25 UTC by James Dingwall
Modified: 2019-01-21 13:25 UTC (History)
0 users

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Description James Dingwall 2019-01-21 13:25:30 UTC
This issue seems to be related to #12952.

I was trying to create a new zone with just a wildcard record which points to a CEPH radosgw.  The AD domain is example.com.  I executed these commands on an Ubuntu Disco samba domain controller:

# samba-tool dns zonecreate $(hostname) s3sub.example.com
# samba-tool dns add $(hostname) s3sub.example.com @ A <IPv4_address>
# samba-tool dns add $(hostname) s3sub.example.com @ AAAA <IPv6_address>
# samba-tool dns add $(hostname) s3sub.example.com '*' CNAME @

Inspecting the zone:

# dig @127.0.0.1 axfr s3sub.example.com

; <<>> DiG 9.11.5-1ubuntu1-Ubuntu <<>> @127.0.0.1 axfr s3sub.example.com
; (1 server found)
;; global options: +cmd
s3sub.example.com.  3600    IN      SOA     samba-dc-00.example.com. hostmaster.example.com. 4 900 600 86400 3600
s3sub.example.com.  3600    IN      NS      samba-dc-00.example.com.
s3sub.example.com.  900     IN      A       <IPv4_address>
s3sub.example.com.  900     IN      AAAA    <IPv6_address>
*.s3sub.example.com. 900    IN      CNAME   \@.
s3sub.example.com.  3600    IN      SOA     samba-dc-00.example.com. hostmaster.example.com. 4 900 600 86400 3600
;; Query time: 5 msec
;; SERVER: 127.0.0.1#53(127.0.0.1)
;; WHEN: Mon Jan 21 10:20:27 UTC 2019
;; XFR size: 6 records (messages 1, bytes 248)

Using the Windows 2012R2 DNS administrator I removed and re-created the wildcard record with no change in the zone.  I was expecting to see the CNAME record data to be just '@'

I have worked around the issue by making the wildcard entry this way:

# samba-tool dns add $(hostname) s3sub.example.com '*' CNAME s3sub.example.com


The samba version is:

# apt-cache policy samba
samba:
  Installed: 2:4.9.2+dfsg-2ubuntu2
  Candidate: 2:4.9.2+dfsg-2ubuntu2
  Version table:
 *** 2:4.9.2+dfsg-2ubuntu2 500
        500 http://gb.archive.ubuntu.com/ubuntu disco/main amd64 Packages
        100 /var/lib/dpkg/status