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<p class="MsoNormal">Hi Metze:<o:p></o:p></p>
<p class="MsoNormal">We have finished our investigation on your question regarding anonymous user and session flag SMB2_SESSION_FLAG_IS_NULL. An upcoming release of MS-SMB2 will have the following modifications. I am also attaching a PDF version of the changes
that uses color and strikethrough to highlight the changes.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Section “3.2.5.3.1 Handling a New Authentication”<o:p></o:p></p>
<p class="MsoNormal">--------------------------------------------------------------<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Existing text:<o:p></o:p></p>
<p class="MsoNormal">“<o:p></o:p></p>
<p class="MsoNormal">o If the SMB2_SESSION_FLAG_IS_NULL bit is set in the SessionFlags field of the SMB2 SESSION_SETUP Response, Session.SigningRequired MUST be set to FALSE.
<o:p></o:p></p>
<p class="MsoNormal">o If the SMB2_SESSION_FLAG_IS_GUEST bit is set in the SessionFlags field of the SMB2 SESSION_SETUP Response AND if Session.SigningRequired is TRUE, this indicates a SESSION_SETUP failure and the connection MUST be terminated.<o:p></o:p></p>
<p class="MsoNormal">“<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Modified text:<o:p></o:p></p>
<p class="MsoNormal">“<o:p></o:p></p>
<p class="MsoNormal">o If the security subsystem indicates that the session was established by an anonymous user, Session.SigningRequired MUST be set to FALSE.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">o If the SMB2_SESSION_FLAG_IS_GUEST bit is set in the SessionFlags field of the SMB2 SESSION_SETUP Response AND if Session.SigningRequired is TRUE, this indicates a SESSION_SETUP failure and the connection MUST be terminated.
If the SMB2_SESSION_FLAG_IS_GUEST bit is set in the SessionFlags field of the SMB2 SESSION_SETUP Response AND if RequireMessageSigning is FALSE, Session.SigningRequired MUST be set to FALSE.
<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Section “3.3.5.5.3 Handling GSS-API Authentication”<o:p></o:p></p>
<p class="MsoNormal">----------------------------------------------------------------<o:p></o:p></p>
<p class="MsoNormal">Existing text:<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">“<o:p></o:p></p>
<p class="MsoNormal">4. The server MUST invoke the GSS_Inquire_context call as specified in [RFC2743] section 2.2.6,
<o:p></o:p></p>
<p class="MsoNormal" style="text-indent:.5in">passing the Session.SecurityContext as the context_handle parameter.
<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal" style="text-indent:.5in">If the returned anon_state is TRUE, the server MUST set Session.IsAnonymous to TRUE and
<o:p></o:p></p>
<p class="MsoNormal" style="text-indent:.5in">set the SMB2_SESSION_FLAG_IS_NULL flag in the SessionFlags field of the SMB2
<o:p></o:p></p>
<p class="MsoNormal" style="text-indent:.5in">SESSION_SETUP Response. <o:p></o:p></p>
<p class="MsoNormal" style="text-indent:.5in"><o:p> </o:p></p>
<p class="MsoNormal" style="text-indent:.5in">Otherwise, if the returned src_name corresponds to an implementation-specific guest
<o:p></o:p></p>
<p class="MsoNormal" style="text-indent:.5in">user,<201> the server MUST set the SMB2_SESSION_FLAG_IS_GUEST in the SessionFlags
<o:p></o:p></p>
<p class="MsoNormal" style="text-indent:.5in">field of the SMB2 SESSION_SETUP Response and MUST set Session.IsGuest to TRUE.
<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">5. If either SMB2_SESSION_FLAG_IS_GUEST or SMB2_SESSION_FLAG_IS_NULL was set in the
<o:p></o:p></p>
<p class="MsoNormal" style="text-indent:.5in">SessionFlags, then Session.SigningRequired MUST be set to FALSE. Otherwise, if the
<o:p></o:p></p>
<p class="MsoNormal" style="text-indent:.5in">SecurityMode of the client request has the SMB2_NEGOTIATE_SIGNING_REQUIRED bit set, if
<o:p></o:p></p>
<p class="MsoNormal" style="text-indent:.5in">Connection.ShouldSign is set to TRUE, OR the global RequireMessageSigning is set to TRUE,
<o:p></o:p></p>
<p class="MsoNormal" style="text-indent:.5in">Session.SigningRequired MUST be set to TRUE.<o:p></o:p></p>
<p class="MsoNormal">“<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Modified text:<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">“<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in">4. The server MUST invoke the GSS_Inquire_context call as specified in [RFC2743] section 2.2.6, passing the Session.SecurityContext as the context_handle parameter.<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in">If the returned anon_state is TRUE, the server MUST set Session.IsAnonymous to TRUE and the server MAY set the SMB2_SESSION_FLAG_IS_NULL flag in the SessionFlags field of the SMB2 SESSION_SETUP Response.<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in">Otherwise, if the returned src_name corresponds to an implementation-specific guest user,<201> the server MUST set the SMB2_SESSION_FLAG_IS_GUEST in the SessionFlags field of the SMB2 SESSION_SETUP Response and
MUST set Session.IsGuest to TRUE.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal" style="margin-left:.5in">5. Session.SigningRequired MUST be set to TRUE under the following conditions:<o:p></o:p></p>
<p class="MsoNormal" style="text-indent:.5in">o SMB2_NEGOTIATE_SIGNING_REQUIRED bit is set in the SecurityMode field of the client request<o:p></o:p></p>
<p class="MsoNormal" style="text-indent:.5in">o SMB2_SESSION_FLAG_IS_GUEST is not set in the SessionFlags and Session.IsAnonymous is FALSE and either
<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:.5in;text-indent:.5in">Connection.ShouldSign or global RequireMessageSigning is TRUE<o:p></o:p></p>
<p class="MsoNormal">“<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Please let me know if it does not answer your question.<o:p></o:p></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<div>
<p class="MsoNormal"><span style="color:#1F497D">Regards,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Obaid Farooqi<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Escalation Engineer | Microsoft<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Exceeding your expectations is my highest priority. If you would like to provide feedback on your case you may contact my manager at nkang at Microsoft dot com</span><span style="color:#1F497D"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> Obaid Farooqi
<br>
<b>Sent:</b> Tuesday, May 15, 2012 5:09 PM<br>
<b>To:</b> 'Stefan (metze) Metzmacher' (metze@samba.org)<br>
<b>Cc:</b> MSSolve Case Email<br>
<b>Subject:</b> Check IS_ANONYMOUS in W8 2008 R2 on SMB2 (and SMB1) to see why bit isn't set to TRUE<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Hi Metze:<o:p></o:p></p>
<p class="MsoNormal">I’ll help you with this issue and will be in touch as soon as I have an answer.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Can you please send me a network trace exhibiting this behavior?<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span style="color:#1F497D">Regards,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Obaid Farooqi<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Escalation Engineer | Microsoft<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Exceeding your expectations is my highest priority. If you would like to provide feedback on your case you may contact my manager at nkang at Microsoft dot com</span><o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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