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Internet Engineering Task Force (IETF)                         S. Turner
Internet Draft                                                      IECA
Intended Status: Informational                                R. Housley
Expires: November 22, 2013                                Vigil Security
                                                               J. Schaad
                                                 Soaring Hawk Consulting
                                                            May 21, 2013

                     The application/cms media type


   This document registers the application/cms media types for use with
   the corresponding CMS (Cryptographic Message Syntax) content types.

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."

Copyright Notice

   Copyright (c) 2013 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
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   include Simplified BSD License text as described in Section 4.e of
   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

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1. Introduction

   CMS (Cryptographic Message Syntax) [RFC5652] associates a content
   type identifier (OID) with a content; CMS content types have been
   widely used to define contents that can be enveloped using other CMS
   content types and to define envoloping content types some of which
   provide security services.  CMS protecting content types, those that
   provide security services, include: id-signedData [RFC5652], id-
   envelopedData [RFC5652], id-digestData [RFC5652], id-encryptedData
   [RFC5652], id-ct-authData [RFC5652], id-ct-authEnvelopedData
   [RFC5083], and id-ct-KP-encryptedKeyPkg [RFC6032].  CMS non-
   protecting content types, those that provide no security services but
   encapsulate other CMS content types, include: id-ct-contentInfo
   [RFC5652], id-compressedData [RFC3274], id-ct-contentCollection
   [RFC4073], and id-ct-contentWithAttrs [RFC4073].  Then, there are the
   inner most content types that include: id-data [RFC5652], id-ct-KP-
   aKeyPackage [RFC5958], id-ct-KP-sKeyPackage [RFC6031], id-ct-
   firmwarePackage [RFC4108], id-ct-firmwareLoadReceipt [RFC4108], id-
   ct-firmwareLoadError [RFC4108], id-ct-trustAnchorList [RFC5914], id-
   ct-KP-keyPackageReceipt [ID.housley-keypackage-receipt-n-error], and
   id-ct-KP-keyPackageError [ID.housley-keypackage-receipt-n-error].

   To support conveying CMS content types, this document defines a media
   type and parameters that indicate the enveloping and embedded CMS
   content types.

   [RFC5751] registered the application/pkc7-mime media type.  That
   document defined five optional smime-type parameters.  The smime-type
   parameter originally conveyed details about the security applied
   (signed or enveloped) to the data content type, hence signed-data and
   enveloped-data, the name of the data, and was later expanded to also
   indicate that the message was compressed, compressed-data, and that
   the message is a certs-only message.  This document does not affect
   those registrations as this document places no requirements on S/MIME

   The registration done by the S/MIME documents was done assuming that
   there would be a mime wrapping layer around each of the different
   enveloping contents, thus there was no need to include more than one
   item in each smime-type.  This is no longer the case with some of the
   more advanced enveloping types.  Some protocols such as the CMC
   certification protocol [CMC] have defined additional S/MIME types.
   New protocols that intend to wrap mime content should continue to
   define an smime-type string, however new protocols that intend to
   wrap non-mime types should use this mechanism instead.

   Note that this document uses the ASN.1 label for the object
   identifier in identifying new OID types.  This trend is expected to

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   continue.  However new CMS content types should be affirmative in
   defining the string that identifies the new content type and should
   additionally define if the new content type is expected to appear in
   the etc or itc field.

1.1. Requirements Terminology

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   document are to be interpreted as described in [RFC2119].

2. CMS Media Type Registration Applications

   This section provides the media type registration application for the
   application/cms media type (see [RFC6838], Section 5.6).

   Type name: application

   Subtype name: cms

   Required parameters: None.

   Optional parameters:

     encapsulatedContent=y; where y is one or more CMS ECT
     (Encapsulating Content Types); multiple values are separated by a
     folding-whitespace comma folding-whitespace.   If folding-
     whitespace is used then the set of values must be quoted.
     Currently defined CMS ECTs OID names are found in [RFC3274],
     [RFC4073], [RFC5083], [RFC5652], and [RFC6032]:

     The values for y can be any content type that encapsulates another
     content type.

     innerContent=x; where x is one or more CMS ICT (Inner Content
     Types); multiple values are separated by a folding-whitespace comma
     folding-whitespace.   If folding-whitespace is used then the set of

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     values must be quoted.

     ict=id-ct-KP-aKeyPackage, id-ct-KP-sKeyPackage).  The following are
     ICTs defined in [RFC4108], [RFC5652], [RFC5914], [RFC5958],
     [RFC6031], and [ID.housley-keypackage-receipt-n-error]:

     The values for x can be any content type that does not encapsulate
     another content type.  id-data MUST not be used; id-data
     encapsulation uses the application/pkcs7-mime media type defined in

     The optional parameters are case-sensitive.

   Encoding considerations:


     [RFC5652] requires that the outer most encapsulation be

   Security considerations:

     See [RFC5652], [RFC3370], [RFC5753], and [RFC5754] for id-
     signedData, id-envelopedData, id-digestData, id-encryptedData, id-
     ct-authData; see [RFC5958], [RFC5959], and [RFC6162] for id-ct-KP-
     aKeyPackage; see [RFC6031] and [RFC6160] for id-ct-KP- sKeyPackage;
     see [RFC6032], [RFC6033], and [RFC6161] for id-ct-KP-
     encryptedKeyPkg; see [RFC5914] for id-ct-trustAnchorList; see
     [RFC3274] for id-compressedData; see [RFC5083] and [RFC5084] for
     id-ct-authEnvelopedData; see [RFC4073] for id-ct-contentCollection
     and id-ct-contentWithAttrs; see [RFC4108] for id-ct-
     firmwarePackage, id-ct-firmwareLoadReceipt, id-ct-
     firmwareLoadError; see [ID.housley-keypackage-receipt-n-error] for
     id-ct-KP-keyPackageReceipt and id-ct-KP-keyPackageError.

   Interoperability considerations:

     See [RFC3274], [RFC4073], [RFC4108], [RFC5083], [RFC5652],
     [RFC5958], [RFC5914], [RFC6031], [RFC6032], and [ID.housley-

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     In all cases, CMS content types are encapsulated within ContentInfo
     structures [RFC5652]; that is the outer most enveloping structure
     is ContentInfo.

     When processing a SignedData around any of the inner content type
     the [RFC5652] validation rules MUST be used.  The PKCS #7 [RFC2315]
     validation rules MUST NOT be used.

   Published specification: This specification.

   Applications which use this media type:

     Applications that support CMS (Cryptographic Message Syntax)
     content types.

   Additional information:

     Magic number(s): None
     File extension(s): .cms
     Macintosh File Type Code(s):

   Person & email address to contact for further information:

     Sean Turner <turners@ieca.com>

   Restrictions on usage: none

   Author: Sean Turner <turners@ieca.com>

   Intended usage: COMMON

   Change controller: The IESG <iesg@ietf.org>

3.  IANA Considerations

   IANA is asked to register the media type application/cms in the
   Standards tree using the applications provided in Section 2 of this

4. Security Considerations

   No new security considerations are introduced in additional those
   specified in [RFC3274], [RFC3370], [RFC4073], [RFC4108], [RFC5083],
   [RFC5084], [RFC5652], [RFC5753], [RFC5754], [RFC5914], [RFC5958],
   [RFC6031], [RFC6032], [RFC6033], [RFC6160], [RFC6161], [RFC6162], and

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5. References

5.1. Normative References

   [RFC2119]  Bradner, S., "Key words for use in RFCs to Indicate
              Requirement Levels", BCP 14, RFC 2119, March 1997.

   [RFC3274]  Gutmann, P., "Compressed Data Content Type for
              Cryptographic Message Syntax (CMS)", RFC 3274, June 2002.

   [RFC3370]  Housley, R., "Cryptographic Message Syntax (CMS)
              Algorithms", RFC 3370, August 2002.

   [RFC4073]  Housley, R., "Protecting Multiple Contents with the
              Cryptographic Message Syntax (CMS)", RFC 4073, May 2005.

   [RFC4108]  Housley, R., "Using Cryptographic Message Syntax (CMS) to
              Protect Firmware Packages", RFC 4108, August 2005.

   [RFC5083]  Housley, R., "Cryptographic Message Syntax (CMS)
              Authenticated-Enveloped-Data Content Type", RFC 5083,
              November 2007.

   [RFC5084]  Housley, R., "Using AES-CCM and AES-GCM Authenticated
              Encryption in the Cryptographic Message Syntax (CMS)", RFC
              5084, November 2007.

   [RFC5652]  Housley, R., "Cryptographic Message Syntax (CMS)", STD 70,
              RFC 5652, September 2009.

   [RFC5753]  Turner, S. and D. Brown, "Use of Elliptic Curve
              Cryptography (ECC) Algorithms in Cryptographic Message
              Syntax (CMS)", RFC 5753, January 2010.

   [RFC5754]  Turner, S., "Using SHA2 Algorithms with Cryptographic
              Message Syntax", RFC 5754, January 2010.

   [RFC5914]  Housley, R., Ashmore, S., and C. Wallace, "Trust Anchor
              Format", RFC 5914, June 2010.

   [RFC5958]  Turner, S., "Asymmetric Key Packages", RFC 5958, August

   [RFC5959]  Turner, S., "Algorithms for Asymmetric Key Package Content
              Type", RFC 5959, August 2010.

   [RFC6031]  Turner, S. and R. Housley, "Cryptographic Message Syntax

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              (CMS) Symmetric Key Package Content Type", RFC 6031,
              December 2010.

   [RFC6032]  Turner, S. and R. Housley, "Cryptographic Message Syntax
              (CMS) Encrypted Key Package Content Type", RFC 6032,
              December 2010.

   [RFC6033]  Turner, S., "Algorithms for Cryptographic Message Syntax
              (CMS) Encrypted Key Package Content Type", RFC 6033,
              December 2010.

   [RFC6160]  Turner, S., "Algorithms for Cryptographic Message Syntax
              (CMS) Protection of Symmetric Key Package Content Types",
              RFC 6160, April 2011.

   [RFC6838]  Freed, N., Klensin, J., and T. Hansen, "Media Type
              Specifications and Registration Procedures", BCP 13, RFC
              6838, January 2013.

   [ID.housley-keypackage-receipt-n-error] Housley, R., "Cryptographic
              Message Syntax (CMS) Key Package Receipt and Error Content
              Types", draft-housley-ct-keypackage-receipt-n-error, May

5.2. Informative References

   [RFC2315]  Kaliski, B., "PKCS #7: Cryptographic Message Syntax
              Version 1.5", RFC 2315, March 1998.

   [RFC5751]  Ramsdell, B. and S. Turner, "Secure/Multipurpose Internet
              Mail Extensions (S/MIME) Version 3.2 Message
              Specification", RFC 5751, January 2010.

Authors' Addresses

   Sean Turner
   IECA, Inc.
   3057 Nutley Street, Suite 106
   Fairfax, VA 22031

   EMail: turners@ieca.com
   Phone: +1.703.628.3180

   Russell Housley
   Vigil Security, LLC
   918 Spring Knoll Drive
   Herndon, VA 20170

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   EMail: housley@vigilsec.com

   Jim Schaad
   Soaring Hawk Consulting

   EMail: jimsch@augustcellars.com

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