Re: [External] : Re: Windows Credential Guard with MSLSA

Ok, constrained delegation using Linux MIT libraries require implementation of GSSAPI  per MIT documentation https://web.mit.edu/kerberos/www/krb5-latest/doc/appdev/gssapi.html#:~:text=To%20perform%20a%20constrained%20delegation,if%20the%20KDC%20allows%20it.

The code I am looking at is not having a GSSAPI implementation.  Is there an alternative to GSSAPI implementation to implement constrained delegation using Linux MIT Libraries?

Seshan

From: Simo Sorce <[email protected]>
Date: Wednesday, September 6, 2023 at 3:09 PM
To: Seshan Parameswaran <[email protected]>, Sam Hartman <[email protected]>, [email protected] <[email protected]>
Subject: Re: [External] : Re: Windows Credential Guard with MSLSA
Are trying to forward TGTs from Windows clients to a Linux Server?

A) You shouldn't
B) I am not aware of any implementation of Credential Guard that will
allow that.

If you just need to impersonate users for some specific task there is
constrained delegation which is better than forwarding around
credentials critical for security, and allows the KDC (ie central
administration) to properly control and authorize it.

HTH,
Simo.

On Wed, 2023-09-06 at 21:05 +0000, Seshan Parameswaran wrote:
> Hi Sam
> Let me make it clear.
>
> I am using Linux Server / MIT Libraries for server and Windows Client .  Microsoft Active Directory as KDC Host.
>
> Scenario – 1
> Credential cache stored with MSLSA – AllowTGTSessionKey<https://urldefense.com/v3/__https://learn.microsoft.com/en-us/troubleshoot/windows-server/windows-security/kerberos-protocol-registry-kdc-configuration-keys__;!!ACWV5N9M2RV99hQ!JBcxA94CBs94XWhlh4B2vro8K4213C86hIxCLmHSHr5q3j5-fLZofIVxFCogciWjhb5cN_yC49sqihoYjMw$ > registry setting can be used to allow the Linux Kerberos MIT library  to retrieve credential cache from KDC Host for forwardable TGTs.
>
> Scenario-2
>
> Credential cache stored with Windows Credential Guard -  Do not know of any solution that allows Linux Kerberos MIT library to retrieve cache from the Windows Credential Guard as it uses signed certificates.  Looking for a solution.
>
> Hope that helps.
>
> Seshan
>
> From: Sam Hartman <[email protected]>
> Date: Wednesday, September 6, 2023 at 1:58 PM
> To: Seshan Parameswaran <[email protected]>, [email protected] <[email protected]>
> Subject: Re: [External] : Re: Windows Credential Guard with MSLSA
> > > > > > "Seshan" == Seshan Parameswaran <[email protected]> writes:
>
>     Seshan> I am running on Oracle Enterprise Linux and using MIT
>     Seshan> libraries.  I am aware of the AllowTgtSessionKey Registry
>     Seshan> setting parameter that works when MSLSA is used without the
>     Seshan> Credential Guard.  My query is specific to MSLSA used with
>     Seshan> Windows Credential Guard.
>
> Your question doesn't make sense.
> MSLSA is not a Linux thing:
> MS -> Microsoft
> LSA -> local security authority
>
> The LSA exists on Windows systems.
> If you are not on a Windows system, you don't have one.
>
> It may be that you want to be asking about credential guard and Linux.
> But involvind MSLSA or LSA in the discussion only confuses everyone.
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>

--
Simo Sorce
RHEL Crypto Team
Red Hat, Inc


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