< 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
	skipping to change at page 1, line 42 ¶		skipping to change at page 1, line 42 ¶
	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
	skipping to change at page 3, line 15 ¶		skipping to change at page 3, line 15 ¶
	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.
End of changes. 4 change blocks.
	4 lines changed or deleted		4 lines changed or added
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