[cifs-protocol] [REG:117013115252666] Validated-Writes of servicePrincipalNames
srenaden at microsoft.com
Tue Jan 31 22:44:36 UTC 2017
Hello Metze, I am back in office and I will resume my investigation. Please note that the incident number changed. This is just FYI.
Microsoft Windows Open Specifications
From: Stefan Metzmacher [mailto:metze at samba.org]
Sent: Friday, January 13, 2017 9:19 AM
To: Sreekanth Nadendla; cifs-protocol at lists.samba.org
Cc: MSSolve Case Email
Subject: Re: [REG:116052814221908] Validated-Writes of servicePrincipalNames
sorry for the long delay.
The difference I see is that you're doing this as administrator.
I'm talking about validated-writes done by an account on it's own computer object. And that's what [MS-ADTS] 184.108.40.206.220.127.116.11 servicePrincipalName about, also see the parent section 18.104.22.168.3.1.1 Validated Writes
Can you please continue your reserach on this?
> Hello Stefan, simple tests at my end using a test domain controller shows that all of the following values are allowed by MS Windows domain controller. Before I propose any doc changes, can you confirm which domain controller you have used when you say "Testing against a Windows DC shows that **only** numeric characters are allowed after ':'" Did you mean to say the domain controller itself failed to add such SPN ? Or are you saying that it is the SQL Server that didn't find an SPN that has a nonnumeric character after ":" ?
> C:\Users\Administrator>setspn -A MSSQLSvc/myhost.379135DOM.LAB:1433 lvisser
> C:\Users\Administrator>setspn -A MSSQLSvc/myhost.379135DOM.LAB:MYINST1 lvisser
> C:\Users\Administrator>setspn -A MSSQLSvc/myhost.379135DOM.LAB/MYINST2 lvisser
> C:\Users\Administrator>setspn -l lvisser
> Registered ServicePrincipalNames for CN=lora visser,CN=Users,DC=379135DOM,DC=LAB:
> You can even have MSSQLSvc/myhost.379135DOM.LAB:8989797/MYINST2
> But ultimately, If the SPN does not match the string as constructed by the Service i.e. SQL Server in this case, authentication will fail.
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