draft-ietf-curdle-ssh-modp-dh-sha2-01.txt   draft-ietf-curdle-ssh-modp-dh-sha2-02.txt 
Internet Engineering Task Force M. Baushke Internet Engineering Task Force M. Baushke
Internet-Draft Juniper Networks, Inc. Internet-Draft Juniper Networks, Inc.
Updates: 4253, 4432, 4462 (if approved) September 13, 2016 Updates: 4253, 4432 (if approved) March 6, 2017
Intended status: Standards Track Intended status: Standards Track
Expires: March 17, 2017 Expires: September 7, 2017
More Modular Exponential (MODP) Diffie-Hellman (DH) Key Exchange (KEX) More Modular Exponential (MODP) Diffie-Hellman (DH) Key Exchange (KEX)
Groups for Secure Shell (SSH) Groups for Secure Shell (SSH)
draft-ietf-curdle-ssh-modp-dh-sha2-01 draft-ietf-curdle-ssh-modp-dh-sha2-02
Abstract Abstract
This document defines added Modular Exponential (MODP) Groups for the This document defines added Modular Exponential (MODP) Groups for the
Secure Shell (SSH) protocol using SHA-2 hashes. Secure Shell (SSH) protocol using SHA-2 hashes.
Status of This Memo Status of This Memo
This Internet-Draft is submitted in full conformance with the This Internet-Draft is submitted in full conformance with the
provisions of BCP 78 and BCP 79. provisions of BCP 78 and BCP 79.
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Internet-Drafts are working documents of the Internet Engineering Internet-Drafts are working documents of the Internet Engineering
Task Force (IETF). Note that other groups may also distribute Task Force (IETF). Note that other groups may also distribute
working documents as Internet-Drafts. The list of current Internet- working documents as Internet-Drafts. The list of current Internet-
Drafts is at http://datatracker.ietf.org/drafts/current/. Drafts is at http://datatracker.ietf.org/drafts/current/.
Internet-Drafts are draft documents valid for a maximum of six months Internet-Drafts are draft documents valid for a maximum of six months
and may be updated, replaced, or obsoleted by other documents at any and may be updated, replaced, or obsoleted by other documents at any
time. It is inappropriate to use Internet-Drafts as reference time. It is inappropriate to use Internet-Drafts as reference
material or to cite them other than as "work in progress." material or to cite them other than as "work in progress."
This Internet-Draft will expire on March 17, 2017. This Internet-Draft will expire on September 7, 2017.
Copyright Notice Copyright Notice
Copyright (c) 2016 IETF Trust and the persons identified as the Copyright (c) 2017 IETF Trust and the persons identified as the
document authors. All rights reserved. document authors. All rights reserved.
This document is subject to BCP 78 and the IETF Trust's Legal This document is subject to BCP 78 and the IETF Trust's Legal
Provisions Relating to IETF Documents Provisions Relating to IETF Documents
(http://trustee.ietf.org/license-info) in effect on the date of (http://trustee.ietf.org/license-info) in effect on the date of
publication of this document. Please review these documents publication of this document. Please review these documents
carefully, as they describe your rights and restrictions with respect carefully, as they describe your rights and restrictions with respect
to this document. Code Components extracted from this document must to this document. Code Components extracted from this document must
include Simplified BSD License text as described in Section 4.e of include Simplified BSD License text as described in Section 4.e of
the Trust Legal Provisions and are provided without warranty as the Trust Legal Provisions and are provided without warranty as
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transport of Top Secret information. For this reason, the new MODP transport of Top Secret information. For this reason, the new MODP
groups are being introduced starting with the MODP 3072-bit group 15 groups are being introduced starting with the MODP 3072-bit group 15
are all using SHA2-512 as the hash algorithm. are all using SHA2-512 as the hash algorithm.
The DH 2048-bit MODP group 14 is already present in most SSH The DH 2048-bit MODP group 14 is already present in most SSH
implementations and most implementations already have a SHA2-256 implementations and most implementations already have a SHA2-256
implementation, so diffie-hellman-group14-sha256 is provided as an implementation, so diffie-hellman-group14-sha256 is provided as an
easy to implement and faster to use key exchange for small embedded easy to implement and faster to use key exchange for small embedded
applications. applications.
In [RFC4462], there is another method for providing DH key exchange
with MODP Groups using "Generic Security Service Application Program
Interface (GSS-API)". This RFC extends the "gss-*" MODP DH groups
and provides for using SHA-2 based hashes for them as well.
Please send comments on this draft to ietf-ssh@NetBSD.org and ietf- Please send comments on this draft to ietf-ssh@NetBSD.org and ietf-
curdle@ietf.org. curdle@ietf.org.
2. Requirements Language 2. Requirements Language
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
"SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
document are to be interpreted as described in [RFC2119]. document are to be interpreted as described in [RFC2119].
3. Key Exchange Algorithms 3. Key Exchange Algorithms
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how the use of new data key exchange is indicated in SSH. how the use of new data key exchange is indicated in SSH.
The following new key exchange algorithms are defined: The following new key exchange algorithms are defined:
Key Exchange Method Name Key Exchange Method Name
diffie-hellman-group14-sha256 diffie-hellman-group14-sha256
diffie-hellman-group15-sha512 diffie-hellman-group15-sha512
diffie-hellman-group16-sha512 diffie-hellman-group16-sha512
diffie-hellman-group17-sha512 diffie-hellman-group17-sha512
diffie-hellman-group18-sha512 diffie-hellman-group18-sha512
gss-group14-sha256-*
gss-group15-sha512-*
gss-group16-sha512-*
gss-group17-sha512-*
gss-group18-sha512-*
Figure 1 Figure 1
The SHA-2 family of secure hash algorithms are defined in The SHA-2 family of secure hash algorithms are defined in
[FIPS-180-4]. [FIPS-180-4].
The method of key exchange used for the name "diffie-hellman- The method of key exchange used for the name "diffie-hellman-
group14-sha256" is the same as that for "diffie-hellman-group14-sha1" group14-sha256" is the same as that for "diffie-hellman-group14-sha1"
except that the SHA2-256 hash algorithm is used. except that the SHA2-256 hash algorithm is used.
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IANA is requested to add to the Key Exchange Method Names algorithm IANA is requested to add to the Key Exchange Method Names algorithm
registry with the following entries: registry with the following entries:
Key Exchange Method Name Reference Key Exchange Method Name Reference
----------------------------- ---------- ----------------------------- ----------
diffie-hellman-group14-sha256 This Draft diffie-hellman-group14-sha256 This Draft
diffie-hellman-group15-sha512 This Draft diffie-hellman-group15-sha512 This Draft
diffie-hellman-group16-sha512 This Draft diffie-hellman-group16-sha512 This Draft
diffie-hellman-group17-sha512 This Draft diffie-hellman-group17-sha512 This Draft
diffie-hellman-group18-sha512 This Draft diffie-hellman-group18-sha512 This Draft
gss-group14-sha256-* This Draft
gss-group15-sha512-* This Draft
gss-group16-sha512-* This Draft
gss-group17-sha512-* This Draft
gss-group18-sha512-* This Draft
[TO BE REMOVED: This registration should take place at the following [TO BE REMOVED: This registration should take place at the following
location: <http://www.iana.org/assignments/ssh-parameters/ssh- location: <http://www.iana.org/assignments/ssh-parameters/ssh-
parameters.xhtml#ssh-parameters-16>] parameters.xhtml#ssh-parameters-16>]
5. Security Considerations 5. Security Considerations
The security considerations of [RFC4253] apply to this document. The security considerations of [RFC4253] apply to this document.
The security considerations of [RFC3526] suggest that these MODP The security considerations of [RFC3526] suggest that these MODP
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Key Lengths", NIST Special Publication 800-131A Revision Key Lengths", NIST Special Publication 800-131A Revision
1, November 2015, 1, November 2015,
<http://nvlpubs.nist.gov/nistpubs/SpecialPublications/ <http://nvlpubs.nist.gov/nistpubs/SpecialPublications/
NIST.SP.800-131Ar1.pdf>. NIST.SP.800-131Ar1.pdf>.
[RFC3766] Orman, H. and P. Hoffman, "Determining Strengths For [RFC3766] Orman, H. and P. Hoffman, "Determining Strengths For
Public Keys Used For Exchanging Symmetric Keys", BCP 86, Public Keys Used For Exchanging Symmetric Keys", BCP 86,
RFC 3766, DOI 10.17487/RFC3766, April 2004, RFC 3766, DOI 10.17487/RFC3766, April 2004,
<http://www.rfc-editor.org/info/rfc3766>. <http://www.rfc-editor.org/info/rfc3766>.
[RFC4462] Hutzelman, J., Salowey, J., Galbraith, J., and V. Welch,
"Generic Security Service Application Program Interface
(GSS-API) Authentication and Key Exchange for the Secure
Shell (SSH) Protocol", RFC 4462, DOI 10.17487/RFC4462, May
2006, <http://www.rfc-editor.org/info/rfc4462>.
[RFC6194] Polk, T., Chen, L., Turner, S., and P. Hoffman, "Security [RFC6194] Polk, T., Chen, L., Turner, S., and P. Hoffman, "Security
Considerations for the SHA-0 and SHA-1 Message-Digest Considerations for the SHA-0 and SHA-1 Message-Digest
Algorithms", RFC 6194, DOI 10.17487/RFC6194, March 2011, Algorithms", RFC 6194, DOI 10.17487/RFC6194, March 2011,
<http://www.rfc-editor.org/info/rfc6194>. <http://www.rfc-editor.org/info/rfc6194>.
Author's Address Author's Address
Mark D. Baushke Mark D. Baushke
Juniper Networks, Inc. Juniper Networks, Inc.
1133 Innovation Way 1133 Innovation Way
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