Key Exchange (KEX) Method Updates and Recommendations for Secure Shell (SSH)
draft-ietf-curdle-ssh-kex-sha2-07
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Internet Engineering Task Force M. Baushke
Internet-Draft Juniper Networks, Inc.
Updates: 4250, 4253 (if approved) March 27, 2017
Intended status: Standards Track
Expires: September 28, 2017
Key Exchange (KEX) Method Updates and Recommendations for Secure Shell
(SSH)
draft-ietf-curdle-ssh-kex-sha2-07
Abstract
This document is intended to update the recommended set of key
exchange methods for use in the Secure Shell (SSH) protocol to meet
evolving needs for stronger security. This RFC updates [RFC4253]
MUST algorithms. This RFC also notes that the [IANASSH] has replaced
[RFC4250] as the primary reference document for SSH Protocol Assigned
Numbers.
This document adds recommendations for adoption of Key Exchange
Methods which MUST, SHOULD+, SHOULD, SHOULD-, MAY, SHOULD NOT, and
MUST NOT be implemented. New key exchange methods will use the SHA-2
family of hashes and are drawn from these from
[I-D.ietf-curdle-ssh-curves] and new-modp from the
[I-D.ietf-curdle-ssh-modp-dh-sha2] and gss-keyex [NEWGSSAPI].
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 September 28, 2017.
Baushke Expires September 28, 2017 [Page 1]
Internet-Draft KEX Method Updates/Recommendations for SSH March 2017
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
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described in the Simplified BSD License.
Table of Contents
1. Overview and Rationale . . . . . . . . . . . . . . . . . . . 2
2. Requirements Language . . . . . . . . . . . . . . . . . . . . 3
3. Key Exchange Methods . . . . . . . . . . . . . . . . . . . . 3
3.1. curve25519-sha256 . . . . . . . . . . . . . . . . . . . . 4
3.2. diffie-hellman-group-exchange-sha1 . . . . . . . . . . . 4
3.3. diffie-hellman-group1-sha1 . . . . . . . . . . . . . . . 4
3.4. diffie-hellman-group14-sha1 . . . . . . . . . . . . . . . 4
3.5. diffie-hellman-group14-sha256 . . . . . . . . . . . . . . 4
3.6. diffie-hellman-group16-sha512 . . . . . . . . . . . . . . 4
3.7. ecdh-sha2-nistp256 . . . . . . . . . . . . . . . . . . . 5
3.8. ecdh-sha2-nistp384 . . . . . . . . . . . . . . . . . . . 5
3.9. gss-gex-sha1-* . . . . . . . . . . . . . . . . . . . . . 5
3.10. gss-group1-sha1-* . . . . . . . . . . . . . . . . . . . . 5
3.11. gss-group14-sha1-* . . . . . . . . . . . . . . . . . . . 5
3.12. gss-group14-sha256-* . . . . . . . . . . . . . . . . . . 6
3.13. gss-group16-sha512-* . . . . . . . . . . . . . . . . . . 6
3.14. rsa1024-sha1 . . . . . . . . . . . . . . . . . . . . . . 6
4. Summary Guidance for Key Exchange Method Names . . . . . . . 6
5. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 7
6. Security Considerations . . . . . . . . . . . . . . . . . . . 7
7. References . . . . . . . . . . . . . . . . . . . . . . . . . 8
7.1. Normative References . . . . . . . . . . . . . . . . . . 8
7.2. Informative References . . . . . . . . . . . . . . . . . 9
Author's Address . . . . . . . . . . . . . . . . . . . . . . . . 11
1. Overview and Rationale
Secure Shell (SSH) is a common protocol for secure communication on
the Internet. In [RFC4253], SSH originally defined two Key Exchange
Method Names that MUST be implemented. Over time, what was once
considered secure, is no longer considered secure. The purpose of
Baushke Expires September 28, 2017 [Page 2]
Internet-Draft KEX Method Updates/Recommendations for SSH March 2017
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