draft-ietf-tls-ssl2-must-not-01.txt   draft-ietf-tls-ssl2-must-not-02.txt 
Network Working Group S. Turner Network Working Group S. Turner
Internet Draft IECA Internet Draft IECA
Updates: 5246 (once approved) Tim Polk Updates: 5246 (once approved) Tim Polk
Intended Status: Standards Track NIST Intended Status: Standards Track NIST
Expires: April 7, 2011 October 7, 2010 Expires: April 8, 2011 October 8, 2010
Prohibiting SSL Version 2.0 Prohibiting SSL Version 2.0
draft-ietf-tls-ssl2-must-not-01.txt draft-ietf-tls-ssl2-must-not-02.txt
Abstract Abstract
This document requires that when TLS clients and servers establish This document requires that when TLS clients and servers establish
connections that they never negotiate the use of Secure Sockets Layer connections that they never negotiate the use of Secure Sockets Layer
(SSL) version 2.0. This document updates the backward compatibility (SSL) version 2.0. This document updates the backward compatibility
sections found in the Transport Security Layer (TLS) Protocol, RFC sections found in the Transport Security Layer (TLS) Protocol, RFC
5246. 5246.
Status of this Memo Status of this Memo
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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."
The list of current Internet-Drafts can be accessed at The list of current Internet-Drafts can be accessed at
http://www.ietf.org/ietf/1id-abstracts.txt. http://www.ietf.org/ietf/1id-abstracts.txt.
The list of Internet-Draft Shadow Directories can be accessed at The list of Internet-Draft Shadow Directories can be accessed at
http://www.ietf.org/shadow.html. http://www.ietf.org/shadow.html.
This Internet-Draft will expire on April 7, 2009. This Internet-Draft will expire on April 8, 2009.
Copyright Notice Copyright Notice
Copyright (c) 2010 IETF Trust and the persons identified as the Copyright (c) 2010 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
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o Sessions can be easily terminated. A man-in-the-middle can easily o Sessions can be easily terminated. A man-in-the-middle can easily
insert a TCP FIN to close the session and the peer is unable to insert a TCP FIN to close the session and the peer is unable to
determine whether or not it was a legitimate end of the session. determine whether or not it was a legitimate end of the session.
3. Changes to TLS 3. Changes to TLS
Because of the deficiencies noted in the previous section: Because of the deficiencies noted in the previous section:
o TLS clients MUST NOT negotiate or use SSL 2.0. o TLS clients MUST NOT negotiate or use SSL 2.0.
o TLS clients MUST NOT send SSL 2.0 ClientHello messages. o TLS clients MUST NOT send SSL 2.0 CLIENT-HELLO messages.
o TLS servers MUST NOT negotiate or use SSL 2.0. o TLS servers MUST NOT negotiate or use SSL 2.0.
As described in [TLS], TLS servers that do not support SSL 2.0 MAY As described in [TLS], TLS servers that do not support SSL 2.0 MAY
accept version 2.0 CLIENT-HELLO messages as the first message of a accept version 2.0 CLIENT-HELLO messages as the first message of a
TLS handshake for interoperability with old clients. TLS handshake for interoperability with old clients.
4. IANA Considerations 4. IANA Considerations
None. None.
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