Network Working Group P. Hallam-Baker Internet-Draft Comodo Group Inc. Intended status: Informational August 18, 2017 Expires: February 19, 2018 Mathematical Mesh: Reference Implementation draft-hallambaker-mesh-developer-03 Abstract The Mathematical Mesh ?The Mesh? is an end-to-end secure infrastructure that facilitates the exchange of configuration and credential data between multiple user devices. This document describes the Mesh reference code and how to install, run and make use of it in applications. It does not form a part of the Mesh specifications and is not normative. Status of This Memo This Internet-Draft is submitted in full conformance with the provisions of BCP 78 and BCP 79. Internet-Drafts are working documents of the Internet Engineering Task Force (IETF). Note that other groups may also distribute working documents as Internet-Drafts. The list of current Internet- Drafts is at http://datatracker.ietf.org/drafts/current/. Internet-Drafts are draft documents valid for a maximum of six months and may be updated, replaced, or obsoleted by other documents at any time. It is inappropriate to use Internet-Drafts as reference material or to cite them other than as "work in progress." This Internet-Draft will expire on February 19, 2018. Copyright Notice Copyright (c) 2017 IETF Trust and the persons identified as the document authors. All rights reserved. This document is subject to BCP 78 and the IETF Trust's Legal Provisions Relating to IETF Documents (http://trustee.ietf.org/license-info) in effect on the date of publication of this document. Please review these documents carefully, as they describe your rights and restrictions with respect to this document. Code Components extracted from this document must include Simplified BSD License text as described in Section 4.e of Hallam-Baker Expires February 19, 2018 [Page 1] Internet-Draft Mathematical Mesh Developer August 2017 the Trust Legal Provisions and are provided without warranty as described in the Simplified BSD License. Table of Contents 1. Definitions . . . . . . . . . . . . . . . . . . . . . . . . . 3 1.1. Requirements Language . . . . . . . . . . . . . . . . . . 3 1.2. Defined Terms . . . . . . . . . . . . . . . . . . . . . . 3 1.3. Related Specifications . . . . . . . . . . . . . . . . . 3 1.4. Implementation Status . . . . . . . . . . . . . . . . . . 3 2. Getting the Reference Code and Build Tools . . . . . . . . . 3 2.1. Obtaining the Development Environment . . . . . . . . . . 4 2.2. Obtaining the Build Tools . . . . . . . . . . . . . . . . 4 2.3. Obtaining the Mesh Source Libraries . . . . . . . . . . . 4 3. Running the Reference Code Examples . . . . . . . . . . . . . 5 3.1. Starting the Server . . . . . . . . . . . . . . . . . . . 5 3.2. The Profile Manager Wizard . . . . . . . . . . . . . . . 5 3.3. The Profile Connection Wizard . . . . . . . . . . . . . . 6 4. Platform specific configuration data . . . . . . . . . . . . 6 4.1. Windows . . . . . . . . . . . . . . . . . . . . . . . . . 6 4.1.1. Private Key Data . . . . . . . . . . . . . . . . . . 6 4.1.2. Registry settings . . . . . . . . . . . . . . . . . . 6 4.1.3. Profile data files . . . . . . . . . . . . . . . . . 7 4.2. OSX and Linux . . . . . . . . . . . . . . . . . . . . . . 7 5. Using the Mesh C#/.Net Libraries in an Application . . . . . 7 5.1. Creating a Portal Client Connection . . . . . . . . . . . 7 5.2. Checking that a Portal Account name is acceptable . . . . 8 5.3. Creating a Personal Profile . . . . . . . . . . . . . . . 8 5.4. Creating an Offline Escrow Entry . . . . . . . . . . . . 8 5.5. Publishing the Profile and Escrow Entries . . . . . . . . 8 5.6. Attaching a New Device . . . . . . . . . . . . . . . . . 8 5.7. Attaching a new Application . . . . . . . . . . . . . . . 8 5.8. Deleting Profile Data . . . . . . . . . . . . . . . . . . 8 5.9. Recovering Profile Data . . . . . . . . . . . . . . . . . 8 6. Using other languages . . . . . . . . . . . . . . . . . . . . 8 6.1. Using the C Binding . . . . . . . . . . . . . . . . . . . 8 7. Implementation Status . . . . . . . . . . . . . . . . . . . . 8 7.1. Reference Implementation . . . . . . . . . . . . . . . . 9 7.1.1. Coverage: . . . . . . . . . . . . . . . . . . . . . . 9 7.1.2. Licensing . . . . . . . . . . . . . . . . . . . . . . 10 7.1.3. Implementation Experience . . . . . . . . . . . . . . 10 7.1.4. Contact Info . . . . . . . . . . . . . . . . . . . . 10 8. Security Considerations . . . . . . . . . . . . . . . . . . . 10 9. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 10 10. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 10 11. References . . . . . . . . . . . . . . . . . . . . . . . . . 10 11.1. Normative References . . . . . . . . . . . . . . . . . . 10 11.2. Informative References . . . . . . . . . . . . . . . . . 11 Hallam-Baker Expires February 19, 2018 [Page 2] Internet-Draft Mathematical Mesh Developer August 2017 Author's Address . . . . . . . . . . . . . . . . . . . . . . . . 11 1. Definitions This section presents the related specifications and standard, the terms that are used as terms of art within the documents and the terms used as requirements language. 1.1. Requirements Language This document is not normative and does not contain requirements language 1.2. Defined Terms The terms of art used in this document are described in the Mesh Architecture Guide [draft-hallambaker-mesh-architecture] [draft-hallambaker-mesh-architecture] . 1.3. Related Specifications The architecture of the Mathematical Mesh is described in the Mesh Architecture Guide [draft-hallambaker-mesh-architecture] [draft-hallambaker-mesh-architecture] . The Mesh documentation set and related specifications are described in this document. 1.4. Implementation Status The implementation status of the reference code base is described in the companion document [draft-hallambaker-mesh-developer] [draft-hallambaker-mesh-developer] . 2. Getting the Reference Code and Build Tools The Mesh Reference library was developed using Visual Studio 2017 Community Edition [VS2017] [VS2017] using PHB?s Build Tools [PHB2017] [PHB2017] extensions. The reference code itself is currently limited to C# libraries. The code should in theory run under other operating systems but this has not been tested recently. Development under different development environments is also possible but would require re-engineering to make use of the line mode versions of the build tools. Hallam-Baker Expires February 19, 2018 [Page 3] Internet-Draft Mathematical Mesh Developer August 2017 2.1. Obtaining the Development Environment Visual Studio 2015 Community Edition is currently available at no cost for a wide range of non-commercial development including personal use and development of Open Source software. For full details, please consult the license published by Microsoft. https://www.visualstudio.com/ Figure 1 2.2. Obtaining the Build Tools Over half the code in the reference code library is generated using code generators. These are used to ensure that the specification, examples and reference code are always kept in synchronization. The build tools are published under an MIT License and are available in two forms: As stand-alone tools to be run from the command line. As a VSIX package that integrates into the Visual Studio environment. The source distribution is configured to use the tools integrated into the Visual Studio environment. If development on other platforms is desired, the simplest approach is likely to be to write a tool that reads the Visual Studio configuration files and generates the corresponding files for use with make. The VSIX package is available from the Visual Studio extensions gallery: PHB Code Generation Tools Figure 2 The source code for the build tools is available from: https://sourceforge.net/projects/phb-build-tools/ Figure 3 2.3. Obtaining the Mesh Source Libraries The Mesh reference library source code is published under an MIT license and is available from: Hallam-Baker Expires February 19, 2018 [Page 4] Internet-Draft Mathematical Mesh Developer August 2017 https://sourceforge.net/projects/mathematicalmesh/ Figure 4 3. Running the Reference Code Examples The reference code examples are designed to illustrate how the Mesh might be used in an application rather than be standalone tools in their own right. The Mesh is designed to make it each for developers to add security to their own applications rather than providing the applications themselves. 3.1. Starting the Server On the Windows platform, the server runs in the context of the platform Web server and must be granted permission to bind to the range of server addresses used using the netsh command. From a command prompt with administrator privileges, run the following command: netsh http add urlacl http:///.well-known/mmm/ \user=\ Figure 5 Where is the DNS domain name under which the service is run, is the Windows domain name of the machine and the account name. To start the service from the command line type: servermesh Figure 6 The server does not require administration privileges. 3.2. The Profile Manager Wizard The profile manager wizard demonstrates functions that are performed on an administration device. These include creating a completely new profile and initial configuration of applications, connecting a device to the profile and recovery of the profile from escrow data. To run the client from the command line, place the executable image in a location that it will be found in the PATH variable and type: Hallam-Baker Expires February 19, 2018 [Page 5] Internet-Draft Mathematical Mesh Developer August 2017 meshclient Figure 7 3.3. The Profile Connection Wizard The Profile connection wizard demonstrates the much more restricted functionality that would be required in a Mesh connected application and/or a profile manager for a non-administration device. To run the client from the command line, place the executable image in a location that it will be found in the PATH variable and type: meshconnect Figure 8 4. Platform specific configuration data 4.1. Windows 4.1.1. Private Key Data All private key data is stored using the Windows public key store. At minimum, this ensures that private keys are obfuscated and encrypted under the account password to protect the data against casual extraction attacks. On a machine with cryptographic hardware support such as a TPM or HSM, extraction of the private key may be infeasible without physical access to the machine and possibly require sophisticated diagnostic equipment. 4.1.2. Registry settings Separate settings are used for production and test code. Test Code should use the Registry Hive: HKEY_CURRENT_USER\SOFTWARE\CryptoMesh Production code should use the hive HKEY_CURRENT_USER\SOFTWARE\MathematicalMesh In either case the sub structure is: Contains the set of Mesh Portal Accounts for the user. The default value is the account name of the default account. The Name of the each key is a portal account name and the value a REG_SZ entry containing the UDF of the profile master key. Hallam-Baker Expires February 19, 2018 [Page 6] Internet-Draft Mathematical Mesh Developer August 2017 Contains the set of Mesh Profiles for the user. The default value is the UDF of the default profile master key. The Name of each key is the UDF of the master key and the value a REG_SZ entry containing the file location of the cached copy of the personal profile. Contains the set of Device profiles in the same format as the PersonalProfiles. 4.1.3. Profile data files The profile data itself is stored in data files at the location specified in the registry. The files are standard XML files in UTF8 encoding. 4.2. OSX and Linux [[Not yet implemented, subject to change.] All configuration information is stored in the user directory ~/.mmm Keys are stored in SSH key file format [RFC4716] [RFC4716] using the customary name and extension conventions for that application. 5. Using the Mesh C#/.Net Libraries in an Application The application ExampleGenerator shows the use of the Mesh in an application using the convenience API. It is the application program used to generate the examples in the reference document. ExampleGenerator implements a client that connects to a remote WebService, creates new personal profile with an escrow entry with offline recovery codes, attaches applications and other devices, updates an application profile, deletes all the profile data from the local machine and then restores them using the recovery codes and escrow entry. 5.1. Creating a Portal Client Connection The normal method of creating a Portal Client connection is? Since the purpose of the ExampleGenerator is to create examples for the documentation, it is not necessary for the JSON Remote Procedure Calls to actually be ?Remote?. Instead the ?Local? Procedure Call mode is used in which the client and server both run in the same process with the client API invoking the server dispatch methods through an interface that performs JSON serialization and deserialization but does not invoke the network transport. Hallam-Baker Expires February 19, 2018 [Page 7] Internet-Draft Mathematical Mesh Developer August 2017 ?. For purposes of testing and initial development of a Web Service it is frequently desirable to further simplify the implementation by dispensing with the serialization layer and the client calling the server dispatch methods directly. ?. 5.2. Checking that a Portal Account name is acceptable 5.3. Creating a Personal Profile 5.4. Creating an Offline Escrow Entry 5.5. Publishing the Profile and Escrow Entries 5.6. Attaching a New Device 5.7. Attaching a new Application 5.8. Deleting Profile Data 5.9. Recovering Profile Data 6. Using other languages If you are building Mesh applications in another language, the least effort approach may be to rewrite the PROTOGEN build tool to target your language. Protogen does support generation of C header files that may be used to drive a parser. If however you are adding Mesh support for an application that already uses JSON based protocols, you might want to edit the generator scripting files to generate code for your existing libraries. 6.1. Using the C Binding 7. Implementation Status This section records the status of known implementations of the protocol defined by this specification at the time of posting of this Internet-Draft, and is based on a proposal described in [RFC6892] [RFC6892] . The description of implementations in this section is intended to assist the IETF in its decision processes in progressing drafts to RFCs. Please note that the listing of any individual implementation here does not imply endorsement by the IETF. Hallam-Baker Expires February 19, 2018 [Page 8] Internet-Draft Mathematical Mesh Developer August 2017 Furthermore, no effort has been spent to verify the information presented here that was supplied by IETF contributors. This is not intended as, and must not be construed to be, a catalog of available implementations or their features. Readers are advised to note that other implementations may exist. According to [RFC6892] [RFC6892] , "this will allow reviewers and working groups to assign due consideration to documents that have the benefit of running code, which may serve as evidence of valuable experimentation and feedback that have made the implemented protocols more mature. It is up to the individual working groups to use this information as they see fit". 7.1. Reference Implementation Organization: Comodo Group Inc. Implementer: Phillip Hallam-Baker Maturity: Experimental Prototype This implementation was used to produce the reference section and all the examples in this document. Since the conversion of specification to code is automatic, there is a high degree of assurance that the reference implementation is consistent with this document. 7.1.1. Coverage: The draft-xx branch describes the code used to create version xx of this document. The main current limitations are that the code only supports RSA key pairs and for ease of development the server does not persist keys across sessions. Nor does the implementation currently support the HTTP payload authentication and encryption layer or make use of TLS. These could be easily fixed. The client and server are implemented as libraries that may be called from a multi-protocol server. A standalone server will be provided in a future release. Only the JSON encoding is currently implemented. The JSON-B, JSON-C, ASN.1 and TLS Schema implementations are all supported by the code generation tool but not currently implemented as the build tool bindings for those encodings have not yet been finalized or documented. Hallam-Baker Expires February 19, 2018 [Page 9] Internet-Draft Mathematical Mesh Developer August 2017 The key restrictions for TLS key exchange have not yet been implemented. The code has only been tested on Windows 10 but passed compatibility testing for both Mono and dotNetCore 10 run times which should in theory permit use on Linux and OSX platforms. 7.1.2. Licensing The code is released under an MIT License Source code is available from GitHub at https://github.com/hallambaker/Mathematical-Mesh 7.1.3. Implementation Experience The implementation and specification documentation were developed in Visual Studio using the PHB Build Tools suite. 7.1.4. Contact Info Contact Phillip Hallam-Baker phill@hallambaker.com 8. Security Considerations Security Considerations are addressed in the companion document [draft-hallambaker-mesh-architecture] [draft-hallambaker-mesh-architecture] 9. IANA Considerations This document specifies no actions for IANA 10. Acknowledgements Comodo Group: Egemen Tas, Melhi Abdulhayo?lu, Rob Stradling, Robin Alden. 11. References 11.1. Normative References [RFC4716] Galbraith, J. and R. Thayer, "The Secure Shell (SSH) Public Key File Format", RFC 4716, DOI 10.17487/RFC4716, November 2006. Hallam-Baker Expires February 19, 2018 [Page 10] Internet-Draft Mathematical Mesh Developer August 2017 11.2. Informative References [draft-hallambaker-mesh-architecture] Hallam-Baker, P., "Mathematical Mesh: Architecture", draft-hallambaker-mesh-architecture-03 (work in progress), May 2017. [draft-hallambaker-mesh-developer] Hallam-Baker, P., "Mathematical Mesh: Developer's Guide", draft-hallambaker-mesh-developer-02 (work in progress), September 2016. [PHB2017] "[Reference Not Found!]". [RFC6892] Wilde, E., "The 'describes' Link Relation Type", RFC 6892, DOI 10.17487/RFC6892, March 2013. [VS2017] "[Reference Not Found!]". Author's Address Phillip Hallam-Baker Comodo Group Inc. Email: philliph@comodo.com Hallam-Baker Expires February 19, 2018 [Page 11]