[OpenAFS] AFS Token not renewable after integrated login

[Jeffrey Altman]

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On 12/5/2014 1:31 PM, Dr. Hendrik Naumann wrote:
> Hi
>=20
> I am looking for a way to setup the Integrated Logon in such a way,=20
> that the aquired AFS Tokens can be renewed.=20
>
>[...]
>
> Is there any way to get access to the Kerberos Tickets from the=20
> integrated logon? Under Linux Kerberos can be configured to store its=20
> Tickets in a file und thus the TGT and also the Token can be renewed=20
> later.

The AFS Integrated Logon functionality is implemented as a WinLogon
Authentication Provider function.  The purpose of this function is to
obtain credentials necessary for the logon process to access the user's
profile data that might be stored in a remote file system.  This
function is called before the creation of the logon session.
Credentials obtained in the Authentication Provider can be injected into
the AFS Authentication Group (my Windows variant of PAGs on UNIX) that
will be inherited by the logon session.   However, there is no place to
store the Kerberos TGT that was obtained.

Prior to Windows Vista there were two other hook functions that would be
executed within the logon session.  One when the desktop shell started
and the other when it shutdown.  These functions ran with elevated
permissions so in XP I used them to permit WinLogon to write the
Kerberos TGT to a protected file and then extract it and store the
contents into the logon session credential cache.   This trick no longer
works.  Microsoft removed the hooks because their presence was an
exploitable security hole.

If the TGT obtained by Integrated Logon is for the same Kerberos
principal that will later be found in the MSLSA: credential cache, then
all that is required for NIM to obtain a new AFS token is to configure
the data for your cell in NIM.  If the AFS token is obtained using a
different Kerberos principal, then your users must enter the password
again when the initial token expires.

Support services for Network Identity Manager is provided by Secure
Endpoints.

Jeffrey Altman
Secure Endpoints Inc.




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