[cifs-protocol] [MS-NRPC] 3.1.4.1 Session-Key Negotiation lacking details - TrackingID#2309080040007879

[Andrew Bartlett]

So, what metze is getting as is that the details of what to do if the
behaviour in note <197> is triggered.  If the correct fault (mapped to
an error code) is received by the client, due to noticing an older
unpatched server (or Samba), what is the secure and correct behaviour?

Andrew Bartlett

On Mon, 2023-09-18 at 15:55 +0000, Jeff McCashland (He/him) via cifs-
protocol wrote:
> Hi Metze,
> 
> I haven't seen any response to my request below. 
> 
> Could you give me an idea of when you may be able to provide more
> information on your [MS-NRPC] concern? 
> 
> Best regards,
> Jeff McCashland (He/him) | Senior Escalation Engineer |
> Microsoft Protocol Open Specifications Team
> Phone: +1 (425) 703-8300 x38300 | Hours: 9am-5pm | Time zone: (UTC-
> 08:00) Pacific Time (US and Canada)
> Local country phone number found here: 
> http://support.microsoft.com/globalenglish
>  | Extension 1138300
> 
> -----Original Message-----
> From: Jeff McCashland (He/him) 
> Sent: Tuesday, September 12, 2023 3:49 PM
> To: Stefan Metzmacher <
> metze at samba.org
> >; Ralph Böhme <
> slow at samba.org
> >
> Cc: 
> cifs-protocol at lists.samba.org
> ; Microsoft Support <
> supportmail at microsoft.com
> >
> Subject: RE: [MS-NRPC] 3.1.4.1 Session-Key Negotiation lacking
> details - TrackingID#2309080040007879
> 
> Hi Metze,
> 
> I have reviewed [MS-NRPC] section 3.1.4.1 Session-Key negotiation,
> and I don't seen any mention of downgrade at all. I admit this is a
> document I'm not deeply familiar with. 
> 
> Could you specify which steps you are referring to, what you mean by
> a downgrade, and specifically where you feel more detail is needed? 
> 
> Best regards,
> Jeff McCashland (He/him) | Senior Escalation Engineer |
> Microsoft Protocol Open Specifications Team
> Phone: +1 (425) 703-8300 x38300 | Hours: 9am-5pm | Time zone: (UTC-
> 08:00) Pacific Time (US and Canada) Local country phone number found
> here: 
> http://support.microsoft.com/globalenglish
>  | Extension 1138300
> 
> -----Original Message-----
> From: Jeff McCashland (He/him)
> Sent: Friday, September 8, 2023 1:46 PM
> To: Stefan Metzmacher <
> metze at samba.org
> >; Ralph Böhme <
> slow at samba.org
> >
> Cc: 
> cifs-protocol at lists.samba.org
> ; Microsoft Support <
> supportmail at microsoft.com
> >
> Subject: [MS-NRPC] 3.1.4.1 Session-Key Negotiation lacking details -
> TrackingID#2309080040007879
> 
> [support on CC, updated Subject with new SR ID]
> 
> Hi Metze,
> 
> We have created SR 2309080040007879 to track this issue. I will look
> into it and get back to you. 
> 
> Best regards,
> Jeff McCashland (He/him) | Senior Escalation Engineer |
> Microsoft Protocol Open Specifications Team
> Phone: +1 (425) 703-8300 x38300 | Hours: 9am-5pm | Time zone: (UTC-
> 08:00) Pacific Time (US and Canada) Local country phone number found
> here: 
> http://support.microsoft.com/globalenglish
>  | Extension 1138300
> 
> -----Original Message-----
> From: Stefan Metzmacher <
> metze at samba.org
> >
> Sent: Thursday, September 7, 2023 11:27 PM
> To: Jeff McCashland (He/him) <
> jeffm at microsoft.com
> >; Ralph Böhme <
> slow at samba.org
> >
> Cc: 
> cifs-protocol at lists.samba.org
> 
> Subject: [EXTERNAL] Re: [MS-NRPC] DCERPC_NCA_S_FAULT_INVALID_TAG
> returned instead of STATUS_INVALID_LEVEL -
> TrackingID#2307200040007944
> 
> Hi Jeff,
> 
> > We have updated [MS-NRPC] for the next release to address this
> > issue. We have added the following Behavior Note to section
> > 3.5.4.4.10:
> > 
> > <197> Section 3.5.4.4.10: Windows RPC layer may return its own
> > error code instead of STATUS_INVALID_LEVEL. The error code that a
> > client gets depends on where the calling application is getting the
> > error from:
> > 1. If the client is running on Windows and calling Windows RPC
> > APIs, they may get the Win32 error code RPC_S_INVALID_TAG ([MS-
> > ERREF] section 2.2).
> > 2. If the client is running on third-party operating systems or
> > getting the error code from the wire, they may get
> > nca_s_fault_invalid_tag (0x1C000006). ([C706-RSCP] DCE 1.1: Remote
> > Procedure Call - Reject Status Codes and Parameters).
> > 3. The conversion between the on-the-wire nca_s_fault_invalid_tag
> > and Win32 error code RPC_S_INVALID_TAG is specified in [MS-RPCE]
> > Section 3.1.1.5.5.
> > 
> > I hope that helps.
> 
> Yes, thanks!
> 
> In addition I think 3.1.4.1 Session-Key Negotiation could be much
> more verbose in a way that it would describe how safe downgrade is
> possible and how an unsafe downgrade is detected.
> 
> metze
> _______________________________________________
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> cifs-protocol at lists.samba.org
> 
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> 
-- 
Andrew Bartlett (he/him)       https://samba.org/~abartlet/
Samba Team Member (since 2001) https://samba.org
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