Re: Constrained delegation question!


Normally when you see an anonymous login being attempted with NTLM, it is because the client did not attempt Kerberos authentication to access the remote server.

When you connect to the remote machine in your code to manage the service control manager, are you using an IP address or the host name? Kerb requires the use of the host name.

You might start by using a simple console app on the web server to access the remote SCM and seeing what type of authentication is recorded on the remote machine in the security event log. What you are looking for is a kerberos-based authentication to that machine. If you can only get NTLM auth to the remote machine, you won't be able to get Kerb delegation to work. Hopefully this helps flesh out your mental model.

--
Joe Kaplan-MS MVP Directory Services Programming
Co-author of "The .NET Developer's Guide to Directory Services Programming"
http://www.directoryprogramming.net
"Tony201" <Tony201@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote in message news:5CD39A01-312E-48A0-A594-6AFAD333E825@xxxxxxxxxxxxxxxx
Hi Joe,

You are right there is a service called HOST on the target server which I
have now delegated to the IIS AppPool account. However I am still getting
access denied. The one thing I forgot to mention in my earlier posts is that
when I browse to the application locally (i.e on the web server), it works,
however, when I browse to it from an XP box I get access denied.

The thing that perplexes me is that there are no faillure audit events on
any of the servers including the domain controllers. The only 2 events that
might be related i.e they are generated everytime I browse to the application
from my XP box and they mention the web server name. I have listed these
below.

Event Type: Success Audit
Event Source: Security
Event Category: Logon/Logoff
Event ID: 540
Date: 23/06/2009
Time: 10:22:03
User: NT AUTHORITY\ANONYMOUS LOGON
Computer: TARGET-SERVER
Description:
Successful Network Logon:
User Name:
Domain:
Logon ID: (0x0,0x7D98711)
Logon Type: 3
Logon Process: NtLmSsp
Authentication Package: NTLM
Workstation Name: WEB-SERVER
Logon GUID: -
Caller User Name: -
Caller Domain: -
Caller Logon ID: -
Caller Process ID: -
Transited Services: -
Source Network Address: 172.16.224.1
Source Port: 0
For more information, see Help and Support Center at
http://go.microsoft.com/fwlink/events.asp.

Event Type: Success Audit
Event Source: Security
Event Category: Logon/Logoff
Event ID: 538
Date: 23/06/2009
Time: 10:22:06
User: NT AUTHORITY\ANONYMOUS LOGON
Computer: TARGET-SERVER
Description:
User Logoff:
User Name: ANONYMOUS LOGON
Domain: NT AUTHORITY
Logon ID: (0x0,0x7D98711)
Logon Type: 3
For more information, see Help and Support Center at
http://go.microsoft.com/fwlink/events.asp.


"Joe Kaplan" wrote:

The account to delegate to would be the domain computer account for the
machine running the services. I think you should be able to use the service
type "HOST" which is a wildcard for a bunch of stuff and typically covers
these built in RPC things like remote management.

I'm not sure what this would look like in the GUI exactly. I usually make
this type of change using a lower level tool but hopefully this gives you
the idea.

You should not need to create a new SPN though. You are just delegating to
an existing one. The HOST/xxx SPNs for the computer account are created
automatically when the machine is joined to the domain.

--
Joe Kaplan-MS MVP Directory Services Programming
Co-author of "The .NET Developer's Guide to Directory Services Programming"
http://www.directoryprogramming.net
"Tony201" <Tony201@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote in message
news:2C4151CD-7BE0-4DD4-8D29-B6503FADE28A@xxxxxxxxxxxxxxxx
> Hi Joe,
>
> Thanks for the reply. For this application, I have already setup
> delegation
> for SQL Server access so I have an SPN for my DNS/IIS App Pool > Identity.
> In
> Active Directory under the delegation tab (for IIS App Pool Identity), > I
> have
> allowed delegation to the SQL Server service, however, I don't know how > to
> allow delegation to the Service Control Manager eg, for SQL Server, > under
> the
> delegation tab, I click add and then type in the account that I created
> the
> SQL Server SPN for. For allowing Service Control Manager, which user > would
> I
> need to type in and then what service should I add? Alternatively, how
> would
> I setup an SPN to allow delegation to Window Services?
>
> Cheers,
> Tan
>
> "Joe Kaplan" wrote:
>
>> It should work although I've never tested this scenario.
>>
>> I'd suggest delegating the SPN for HOST/server to the IIS app pool
>> identity
>> (or the computer account if you use network service or system) to see >> if
>> that works. If you are using the full DNS name to connect to the >> remote
>> machine, use that SPN instead. You can also delegate both.
>>
>> If you are getting Kerberos authentication to the remote machine, then
>> the
>> constrained delegation should work here. You can check the security
>> event
>> logs on the remote machine to discover how you are authenticating. If
>> you
>> get NTLM, then it will not work.
>>
>> -- >> Joe Kaplan-MS MVP Directory Services Programming
>> Co-author of "The .NET Developer's Guide to Directory Services
>> Programming"
>> http://www.directoryprogramming.net
>> "Tony201" <Tony201@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote in message
>> news:53E59DB5-B9AC-4D85-B65C-29667E94C725@xxxxxxxxxxxxxxxx
>> > Can I use constrained delegation to alllow my web application to
>> > control
>> > services on a remote server? At the moment, I have code that when >> > run
>> > on
>> > my
>> > local machine (XP - no double hop) is able to control services on
>> > remote
>> > servers. However, when I move the web application to an IIS server, >> > I
>> > get
>> > the
>> > error llisted below. I am guessing that I need to setup an SPN but
>> > don't
>> > know
>> > how to do it for the Service Control Manager. Any ideas?
>> >
>> > [Win32Exception (0x80004005): Access is denied]
>> >
>> > [InvalidOperationException: Cannot open Service Control Manager on
>> > computer
>> > 'serverxxxx'. This operation might require other privileges.]
>> >
>> > System.ServiceProcess.ServiceController.GetDataBaseHandleWithAccess(String
>> > machineName, Int32 serviceControlManaqerAccess) +35775
>> >
>> > System.ServiceProcess.ServiceController.GetDataBaseHandleWithEnumerateAccess(String
>> > machineName) +9
>> > System.ServiceProcess.ServiceController.GetServicesOfType(String
>> > machineName, Int32 serviceType) +143
>> > System.ServiceProcess.ServiceController.GetServices(String
>> > machineName)
>> > +9
>> > AutonomyAdmin.test.test2() +400
>> > AutonomyAdmin.test.Page_Load(Object sender, EventArgs e) +137
>> > System.Web.Util.CalliHelper.EventArgFunctionCaller(IntPtr fp, >> > Object
>> > o,
>> > Object t, EventArgs e) +14
>> > System.Web.Util.CalliEventHandlerDelegateProxy.Callback(Object
>> > sender,
>> > EventArgs e) +35
>> > System.Web.UI.Control.OnLoad(EventArgs e) +99
>> > System.Web.UI.Control.LoadRecursive() +50
>> > System.Web.UI.Page.ProcessRequestMain(Boolean
>> > includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)
>> > +627
>> >
>>
>>



.

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