Bug 20482 – UDM allows to create invalid hostnames

Bug 20482 - UDM allows to create invalid hostnames


Summary:	UDM allows to create invalid hostnames

Status:	CLOSED WONTFIX

Product:	UCS
Classification:	Unclassified
Component:	UMC - Computers
Version:	UCS 2.4
Hardware:	All Linux

Importance:	P5 normal (vote)
Target Milestone:	UCS 3.2-x
Assigned To:	UMC maintainers
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Duplicates:	29700 31798 (view as bug list)
Depends on:
Blocks:
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Reported:	2010-10-22 10:12 CEST by Thorsten Glaser
Modified:	2022-06-30 14:39 CEST (History)
CC List:	4 users (show)

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Description Thorsten Glaser 2010-10-22 10:12:08 CEST

When adding a Computer in UDM, it allows underscores (‘_’) in the
“Hostname (*)” field, which are illegal in DNS though. As the hostname
is used as part of the DNS FQDN, errors are guaranteed to ensue later.

Please implement sanity checks for hostnames according to the appropriate
RFCs (AFAICR, the regexp is [a-zA-Z0-9]([a-zA-Z0-9-]*[a-zA-Z0-9])* – i.e.
alphanumerical, with a hyphen-minus allowed but not as first or last cha-
racter – per dot-separated FQDN part).

Comment 1 Stefan Gohmann

2013-02-19 08:24:18 CET

This should be checked but we should also consider the AD behave.

Comment 2 Florian Best

2016-03-03 13:07:21 CET

*** Bug 31798 has been marked as a duplicate of this bug. ***

Comment 3 Florian Best

2016-03-03 13:07:43 CET

(In reply to Philipp Hahn from Bug #31798 comment #2)
> (In reply to Jan Christoph Ebersbach from comment #1)
> > Actually, this is a DNS issue.  Hostnames must not include underscores!
> 
> Yes and no: DNS allows underscores: RFC 1034, section 3.5 "Preferred name
> syntax", but host-names are letters-digits-hyphen only: RFC 1123, section
> 2.1 "Host Names and Numbers.
> 
> See <http://www.c3.hu/docs/oreilly/tcpip/dnsbind/ch04_05.htm> and
> <http://stackoverflow.com/questions/2180465/can-someone-have-a-subdomain-
> with-an-underscore-in-it> for more details.

Comment 4 Florian Best

2016-03-03 13:08:26 CET

*** Bug 29700 has been marked as a duplicate of this bug. ***

Comment 5 Stefan Gohmann

2016-04-25 07:52:41 CEST

This issue has been filed against UCS 2.4.

UCS 2.4 is out of maintenance and many UCS components have vastly changed in
later releases. Thus, this issue is now being closed.

If this issue still occurs in newer UCS versions, please use "Clone this bug".
In this case please provide detailed information on how this issue is affecting
you.