[MS-NNS]:
.NET NegotiateStream Protocol
Intellectual Property Rights Notice for Open Specifications Documentation
§ Technical Documentation. Microsoft publishes Open Specifications documentation (“this documentation”) for protocols, file formats, data portability, computer languages, and standards support. Additionally, overview documents cover inter-protocol relationships and interactions.
§ Copyrights. This documentation is covered by Microsoft copyrights. Regardless of any other terms that are contained in the terms of use for the Microsoft website that hosts this documentation, you can make copies of it in order to develop implementations of the technologies that are described in this documentation and can distribute portions of it in your implementations that use these technologies or in your documentation as necessary to properly document the implementation. You can also distribute in your implementation, with or without modification, any schemas, IDLs, or code samples that are included in the documentation. This permission also applies to any documents that are referenced in the Open Specifications documentation.
§ No Trade Secrets. Microsoft does not claim any trade secret rights in this documentation.
§ Patents. Microsoft has patents that might cover your implementations of the technologies described in the Open Specifications documentation. Neither this notice nor Microsoft's delivery of this documentation grants any licenses under those patents or any other Microsoft patents. However, a given Open Specifications document might be covered by the Microsoft Open Specifications Promise or the Microsoft Community Promise. If you would prefer a written license, or if the technologies described in this documentation are not covered by the Open Specifications Promise or Community Promise, as applicable, patent licenses are available by contacting .
§ License Programs. To see all of the protocols in scope under a specific license program and the associated patents, visit the Patent Map.
§ Trademarks. The names of companies and products contained in this documentation might be covered by trademarks or similar intellectual property rights. This notice does not grant any licenses under those rights. For a list of Microsoft trademarks, visit www.microsoft.com/trademarks.
§ Fictitious Names. The example companies, organizations, products, domain names, email addresses, logos, people, places, and events that are depicted in this documentation are fictitious. No association with any real company, organization, product, domain name, email address, logo, person, place, or event is intended or should be inferred.
Reservation of Rights. All other rights are reserved, and this notice does not grant any rights other than as specifically described above, whether by implication, estoppel, or otherwise.
Tools. The Open Specifications documentation does not require the use of Microsoft programming tools or programming environments in order for you to develop an implementation. If you have access to Microsoft programming tools and environments, you are free to take advantage of them. Certain Open Specifications documents are intended for use in conjunction with publicly available standards specifications and network programming art and, as such, assume that the reader either is familiar with the aforementioned material or has immediate access to it.
Support. For questions and support, please contact .
Revision Summary
Date / Revision History / Revision Class / Comments /7/20/2007 / 0.1 / Major / MCPP Milestone 5 Initial Availability
9/28/2007 / 0.1.1 / Editorial / Changed language and formatting in the technical content.
10/23/2007 / 0.1.2 / Editorial / Changed language and formatting in the technical content.
11/30/2007 / 0.1.3 / Editorial / Changed language and formatting in the technical content.
1/25/2008 / 1.0 / Major / Updated and revised the technical content.
3/14/2008 / 1.0.1 / Editorial / Changed language and formatting in the technical content.
6/20/2008 / 1.1 / Minor / Clarified the meaning of the technical content.
7/25/2008 / 2.0 / Major / Updated and revised the technical content.
8/29/2008 / 2.0.1 / Editorial / Changed language and formatting in the technical content.
10/24/2008 / 3.0 / Major / Updated and revised the technical content.
12/5/2008 / 3.0.1 / Editorial / Changed language and formatting in the technical content.
1/16/2009 / 3.0.2 / Editorial / Changed language and formatting in the technical content.
2/27/2009 / 3.0.3 / Editorial / Changed language and formatting in the technical content.
4/10/2009 / 3.0.4 / Editorial / Changed language and formatting in the technical content.
5/22/2009 / 3.0.5 / Editorial / Changed language and formatting in the technical content.
7/2/2009 / 3.0.6 / Editorial / Changed language and formatting in the technical content.
8/14/2009 / 3.0.7 / Editorial / Changed language and formatting in the technical content.
9/25/2009 / 3.1 / Minor / Clarified the meaning of the technical content.
11/6/2009 / 3.1.1 / Editorial / Changed language and formatting in the technical content.
12/18/2009 / 3.1.2 / Editorial / Changed language and formatting in the technical content.
1/29/2010 / 3.1.3 / Editorial / Changed language and formatting in the technical content.
3/12/2010 / 3.1.4 / Editorial / Changed language and formatting in the technical content.
4/23/2010 / 3.1.5 / Editorial / Changed language and formatting in the technical content.
6/4/2010 / 3.1.6 / Editorial / Changed language and formatting in the technical content.
7/16/2010 / 4.0 / Major / Updated and revised the technical content.
8/27/2010 / 4.0 / None / No changes to the meaning, language, or formatting of the technical content.
10/8/2010 / 4.0 / None / No changes to the meaning, language, or formatting of the technical content.
11/19/2010 / 4.0 / None / No changes to the meaning, language, or formatting of the technical content.
1/7/2011 / 4.0 / None / No changes to the meaning, language, or formatting of the technical content.
2/11/2011 / 4.0 / None / No changes to the meaning, language, or formatting of the technical content.
3/25/2011 / 4.0 / None / No changes to the meaning, language, or formatting of the technical content.
5/6/2011 / 4.0 / None / No changes to the meaning, language, or formatting of the technical content.
6/17/2011 / 4.1 / Minor / Clarified the meaning of the technical content.
9/23/2011 / 4.1 / None / No changes to the meaning, language, or formatting of the technical content.
12/16/2011 / 5.0 / Major / Updated and revised the technical content.
3/30/2012 / 5.0 / None / No changes to the meaning, language, or formatting of the technical content.
7/12/2012 / 5.1 / Minor / Clarified the meaning of the technical content.
10/25/2012 / 5.1 / None / No changes to the meaning, language, or formatting of the technical content.
1/31/2013 / 5.1 / None / No changes to the meaning, language, or formatting of the technical content.
8/8/2013 / 5.1 / None / No changes to the meaning, language, or formatting of the technical content.
11/14/2013 / 5.1 / None / No changes to the meaning, language, or formatting of the technical content.
2/13/2014 / 5.1 / None / No changes to the meaning, language, or formatting of the technical content.
5/15/2014 / 5.1 / None / No changes to the meaning, language, or formatting of the technical content.
6/30/2015 / 6.0 / Major / Significantly changed the technical content.
10/16/2015 / 6.0 / None / No changes to the meaning, language, or formatting of the technical content.
7/14/2016 / 6.0 / None / No changes to the meaning, language, or formatting of the technical content.
3/16/2017 / 7.0 / Major / Significantly changed the technical content.
6/1/2017 / 7.0 / None / No changes to the meaning, language, or formatting of the technical content.
Table of Contents
1 Introduction 6
1.1 Glossary 6
1.2 References 6
1.2.1 Normative References 6
1.2.2 Informative References 7
1.3 Overview 7
1.4 Relationship to Other Protocols 8
1.5 Prerequisites/Preconditions 8
1.6 Applicability Statement 8
1.7 Versioning and Capability Negotiation 8
1.8 Vendor-Extensible Fields 9
1.9 Standards Assignments 9
2 Messages 10
2.1 Transport 10
2.2 Message Syntax 10
2.2.1 Handshake Message 10
2.2.2 Data Message 11
3 Protocol Details 13
3.1 Client Details 13
3.1.1 Abstract Data Model 13
3.1.1.1 Underlying TCP Connection 14
3.1.1.2 Stream State 14
3.1.1.3 Required Protection Level 14
3.1.1.4 Negotiated Protection Level 14
3.1.1.5 Allowed Impersonation Level 14
3.1.1.6 Negotiated Impersonation Level 15
3.1.1.7 Client Credentials 15
3.1.1.8 Security Provider Context 15
3.1.1.9 Framing Buffer 15
3.1.1.10 Channel Binding Token 15
3.1.1.11 Target Name 15
3.1.2 Timers 15
3.1.3 Initialization 15
3.1.4 Higher-Layer Triggered Events 15
3.1.4.1 Application Invocation of the .NET NegotiateStream Protocol 15
3.1.4.2 Application Request to Send Data 16
3.1.4.3 Application Request to Close Stream 16
3.1.5 Message Processing Events and Sequencing Rules 16
3.1.5.1 GSS_Init_sec_context Returns While in the CreatingSecurityToken State 16
3.1.5.2 Receiving Data in the WaitingForHandshakeMessage State 17
3.1.5.3 GSS_Init_sec_context Returns While in the ProcessingFinalToken State 17
3.1.5.4 Receiving Data in the WaitingForHandshakeDone State 18
3.1.5.5 Receiving Data in the Authenticated State 18
3.1.6 Timer Events 18
3.1.7 Other Local Events 18
3.2 Server Details 19
3.2.1 Abstract Data Model 19
3.2.1.1 Underlying TCP Connection 19
3.2.1.2 Stream State 20
3.2.1.3 Required Protection Level 20
3.2.1.4 Negotiated Protection Level 20
3.2.1.5 Required Impersonation Level 20
3.2.1.6 Negotiated Impersonation Level 20
3.2.1.7 Server Credentials 20
3.2.1.8 Security Provider Context 21
3.2.1.9 Framing Buffer 21
3.2.1.10 Expected Channel Binding 21
3.2.2 Timers 21
3.2.3 Initialization 21
3.2.4 Higher-Layer Triggered Events 21
3.2.4.1 Application Invocation of the .NET NegotiateStream Protocol 21
3.2.4.2 Application Request to Send Data 21
3.2.4.3 Application Request to Close Stream 22
3.2.5 Message Processing Events and Sequencing Rules 22
3.2.5.1 Receiving Data in the WaitingForHandshakeMessage State 22
3.2.5.2 GSS_Accept_sec_context Returns While in the CreatingSecurityToken State 22
3.2.5.3 GSS_Accept_sec_context Returns While in the ProcessingFinalToken State 23
3.2.5.4 Receiving Data in the Authenticated State 23
3.2.6 Timer Events 24
3.2.7 Other Local Events 24
4 Protocol Examples 25
5 Security 30
5.1 Security Considerations for Implementers 30
5.2 Index of Security Parameters 30
6 Appendix A: Product Behavior 31
7 Change Tracking 32
8 Index 33
1 Introduction
The .NET NegotiateStream Protocol provides mutually authenticated and confidential communication over a TCP connection. It defines a framing mechanism used to transfer Generic Security Service Application Program Interface (GSS-API) security tokens between a client and server. It also defines a framing mechanism used to transfer signed and/or encrypted application data once the GSS-API security context initialization has completed. It uses the Simple and Protected Generic Security Service Application Program Interface (GSS-API) Negotiation (SPNEGO) mechanism for security services (authentication, key derivation, and data encryption and decryption).
Sections 1.5, 1.8, 1.9, 2, and 3 of this specification are normative. All other sections and examples in this specification are informative.
1.1 Glossary
This document uses the following terms:
Kerberos: An authentication system that enables two parties to exchange private information across an otherwise open network by assigning a unique key (called a ticket) to each user that logs on to the network and then embedding these tickets into messages sent by the users. For more information, see [MS-KILE].
little-endian: Multiple-byte values that are byte-ordered with the least significant byte stored in the memory location with the lowest address.
Security Support Provider Interface (SSPI): A Windows-specific API implementation that provides the means for connected applications to call one of several security providers to establish authenticated connections and to exchange data securely over those connections. This is the Windows equivalent of Generic Security Services (GSS)-API, and the two families of APIs are on-the-wire compatible.
security token: An opaque message or data packet produced by a Generic Security Services (GSS)-style authentication package and carried by the application protocol. The application has no visibility into the contents of the token.
MAY, SHOULD, MUST, SHOULD NOT, MUST NOT: These terms (in all caps) are used as defined in [RFC2119]. All statements of optional behavior use either MAY, SHOULD, or SHOULD NOT.
1.2 References
Links to a document in the Microsoft Open Specifications library point to the correct section in the most recently published version of the referenced document. However, because individual documents in the library are not updated at the same time, the section numbers in the documents may not match. You can confirm the correct section numbering by checking the Errata.
1.2.1 Normative References
We conduct frequent surveys of the normative references to assure their continued availability. If you have any issue with finding a normative reference, please contact . We will assist you in finding the relevant information.
[MS-ERREF] Microsoft Corporation, "Windows Error Codes".
[MS-NLMP] Microsoft Corporation, "NT LAN Manager (NTLM) Authentication Protocol".
[MS-SPNG] Microsoft Corporation, "Simple and Protected GSS-API Negotiation Mechanism (SPNEGO) Extension".
[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate Requirement Levels", BCP 14, RFC 2119, March 1997, http://www.rfc-editor.org/rfc/rfc2119.txt
[RFC2743] Linn, J., "Generic Security Service Application Program Interface Version 2, Update 1", RFC 2743, January 2000, http://www.rfc-editor.org/rfc/rfc2743.txt
[RFC4178] Zhu, L., Leach, P., Jaganathan, K., and Ingersoll, W., "The Simple and Protected Generic Security Service Application Program Interface (GSS-API) Negotiation Mechanism", RFC 4178, October 2005, http://www.rfc-editor.org/rfc/rfc4178.txt
1.2.2 Informative References
[MS-KILE] Microsoft Corporation, "Kerberos Protocol Extensions".
[RFC4120] Neuman, C., Yu, T., Hartman, S., and Raeburn, K., "The Kerberos Network Authentication Service (V5)", RFC 4120, July 2005, http://www.rfc-editor.org/rfc/rfc4120.txt
[RFC5246] Dierks, T., and Rescorla, E., "The Transport Layer Security (TLS) Protocol Version 1.2", RFC 5246, August 2008, http://www.ietf.org/rfc/rfc5246.txt
1.3 Overview
The .NET NegotiateStream Protocol was introduced to address the need for a simple and lightweight authentication and security mechanism between a client and a server when the client or server needs direct access to the TCP stream. A key benefit is that authentication is accomplished without the use of digital certificates, as is required by the Transport Layer Security (TLS) protocol [RFC5246]. The .NET NegotiateStream Protocol provides a means for framing GSS-API Negotiation (as specified in [RFC4178]) over a TCP stream. This is used to negotiate the security context for communication between a client and a server. The client and server can then exchange data protected by the negotiated security context.