[cifs-protocol] Status: Please clarify LSA and OsVersion behaviour in MS-NRPC (SRX090713600128)

Bill Wesse billwe at microsoft.com
Mon Aug 24 08:41:40 MDT 2009

Good morning Andrew - I have attached a pdf showing the changes that will be in the next update to [MS-NRPC] concerning section NETLOGON_WORKSTATION_INFO OsVersion field description.

These changes will reference [MS-RPRN], which has a full definition for the OSVERSIONINFOEX structure; I have provided a link for this:

[MS-RPRN]: Print System Remote Protocol Specification OSVERSIONINFOEX

Please let me know if this answers your question satisfactorily; if so, I will consider the case resolved. Thanks for helping us improve our documentation!

Bill Wesse
MCSE, MCTS / Senior Escalation Engineer, US-CSS DSC PROTOCOL TEAM
8055 Microsoft Way
Charlotte, NC 28273
TEL:  +1(980) 776-8200
CELL: +1(704) 661-5438
FAX:  +1(704) 665-9606

-----Original Message-----
From: Andrew Bartlett [mailto:abartlet at samba.org] 
Sent: Monday, July 27, 2009 7:26 AM
To: Bill Wesse
Cc: Interoperability Documentation Help; pfif at tridgell.net; cifs-protocol at samba.org; Matthias Dieter Wallnöfer; Hongwei Sun
Subject: RE: Please clarify LSA and OsVersion behaviour in MS-NRPC

On Fri, 2009-07-10 at 02:48 -0700, Bill Wesse wrote:
> Good day Andrew! Hongwei and I have divided your request in two parts - one each for OsVersion and the LsaPolicy buffer.
> I have just filed a Technical Document Issue (TDI) concerning the OsVersion field (of [MS-NRPC] NETLOGON_WORKSTATION_INFO). Hongwei will be your contact for the LsaPolicy buffer information you asked after.
> The OsVersion member is an OSVERSIONINFOEX structure (284 bytes); this is cross-referenced in [MS-REF], and documented on MSDN (links included below, along with the actual typedef). This structure is subject to normal RPC marshaling; .
> As you noted, the OsVersion description states 'the version information is unchanged and uninterpreted' for (placement in) the operatingSystemVersion attribute. This certainly does not match the example given in <23>, which shows "5.2 (3790)".
> I pointed out these discrepancies in the TDI, as well as noting that the operatingSystemVersion attribute is mentioned once only in [MS-ADTS] at 'Flag fRODCFilteredAttribute in Attribute searchFlags' (where there is a link to [MS-ADA3]: Active Directory Schema Attributes N-Z / 2.55 Attribute operatingSystemVersion).
> I have included a manual deconstruction of the OSVERSIONINFOEX structure from netlogon-29.0.in.
> Please let me know your thoughts concerning any further elaboration or reference information that would assist in your efforts!

We do need some further assistance.  Matthias has discovered that we need to implement the small note on WorkstationFlags:
B: Client handles the update of the service principal name (SPN).

That is, we must handle the update of the servicePrincipalName if that bit is not set.

What concerns me is what are the rules for updating the dsnHostName and servicePrincipalName attributes from the information the client supplies here?

Information such as 'the DC must ensure the client selects a name that does not already exist' and what forms of servicePrincipalName are manipulated with this call would be most useful.

I'm concerned that for the natural first implementation, the client could specify any name, and therefore create a collision in the KDC (which service to issue the ticket for), or worse still 'spoof' another server. 

(There is simply no detail on this that I can see in this section)


Andrew Bartlett
Authentication Developer, Samba Team           http://samba.org
Samba Developer, Cisco Inc.
-------------- next part --------------
A non-text attachment was scrubbed...
Name: [MS-NRPC]_Revisions.pdf
Type: application/pdf
Size: 68482 bytes
Desc: [MS-NRPC]_Revisions.pdf
URL: <http://lists.samba.org/pipermail/cifs-protocol/attachments/20090824/17ffa72a/attachment-0001.pdf>

More information about the cifs-protocol mailing list