Re: [TLS] Last Call: <draft-ietf-tls-ssl2-must-not-03.txt>
"Glen Zorn" <gwz@net-zen.net> Fri, 03 December 2010 04:43 UTC
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From: Glen Zorn <gwz@net-zen.net>
To: mrex@sap.com
References: <000001cb9229$6a09e960$3e1dbc20$@net> from "Glen Zorn" at Dec 2, 10 09:01:23 pm <201012021846.oB2IkTCi019858@fs4113.wdf.sap.corp>
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Date: Fri, 03 Dec 2010 11:44:18 +0700
Organization: Network Zen
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Cc: ietf@ietf.org, tls@ietf.org
Subject: Re: [TLS] Last Call: <draft-ietf-tls-ssl2-must-not-03.txt>
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Martin Rex [mailto:mrex@sap.com] writes: > Glen Zorn wrote: > > > > > Glen Zorn wrote: > > > > Section 3 says "TLS clients MUST NOT send SSL 2.0 CLIENT-HELLO > > > messages." > > > > and "TLS servers MUST NOT negotiate or use SSL 2.0" and later "TLS > > > servers > > > > that do not support SSL 2.0 MAY accept version 2.0 CLIENT-HELLO > > > messages as > > > > the first message of a TLS handshake for interoperability with old > > > clients." > > > > Taken together, I find these statements quite confusing, if not > > > outright > > > > self-contradictory. Maybe, a "However" might fix the problem, > though: > > > > > > > > TLS servers MUST NOT negotiate or use SSL 2.0; however, TLS > > > servers > > > > MAY accept SSL 2.0 CLIENT-HELLO messages as the first > message of a > > > > TLS handshake in order to maintain interoperability with > legacy > > > > clients. > > > > Maybe I just don't understand the word "use". It seems like if a > server > > accepts a protocol message it's using the protocol... > > > With "negotiate" I meant returning a ServerHello handshake message with > that version number (neither an SSL 2.0 SERVER-HELLO, nor an SSLv3 > ServerHello with a server version of { 0x02,0x00 }). > > With "use" I meant to successfully complete the handshake and start > exchanging application data protected under protocol version > {0x02,0x00}. Maybe you could spell these things out in the draft just as you have above? > > > The Server accepts the SSL 2.0 CLIENT-HELLO protocol data unit (PDU), > but not the SSL 2.0 protocol. I see. Perhaps the distinction between PDU and "protocol" is just too subtle for me, but assuming (maybe too generously ;-) that I'm not a total moron, others might find it a little bit confusing as well. > If there are no SSLv3 or TLS cipher > suites in that CLIENT-HELLO, or if the (version) field of the > SSL 2.0 CLIENT-HELLO does not indicate at least 3.0, then the server > still MUST abort. > > > -Martin
- [TLS] Last Call: <draft-ietf-tls-ssl2-must-not-03… The IESG
- Re: [TLS] Last Call: <draft-ietf-tls-ssl2-must-no… Glen Zorn
- Re: [TLS] Last Call: <draft-ietf-tls-ssl2-must-no… Michael D'Errico
- Re: [TLS] Last Call: <draft-ietf-tls-ssl2-must-no… Matt McCutchen
- Re: [TLS] Last Call: <draft-ietf-tls-ssl2-must-no… Michael D'Errico
- Re: [TLS] Last Call: <draft-ietf-tls-ssl2-must-no… Matt McCutchen
- Re: [TLS] Last Call: <draft-ietf-tls-ssl2-must-no… Michael D'Errico
- Re: [TLS] Last Call: <draft-ietf-tls-ssl2-must-no… Nikos Mavrogiannopoulos
- Re: [TLS] Last Call: <draft-ietf-tls-ssl2-must-no… Glen Zorn
- Re: [TLS] Last Call: <draft-ietf-tls-ssl2-must-no… Marsh Ray
- Re: [TLS] Last Call: <draft-ietf-tls-ssl2-must-no… Joe Salowey
- Re: [TLS] Last Call: <draft-ietf-tls-ssl2-must-no… Martin Rex
- Re: [TLS] Last Call: <draft-ietf-tls-ssl2-must-no… Glen Zorn
- Re: [TLS] Last Call: <draft-ietf-tls-ssl2-must-no… Glen Zorn
- Re: [TLS] Last Call: <draft-ietf-tls-ssl2-must-no… Martin Rex
- Re: [TLS] Last Call: <draft-ietf-tls-ssl2-must-no… Sean Turner
- Re: [TLS] Last Call: <draft-ietf-tls-ssl2-must-no… Sean Turner
- Re: [TLS] Last Call: <draft-ietf-tls-ssl2-must-no… Marsh Ray
- Re: [TLS] Last Call: <draft-ietf-tls-ssl2-must-no… Glen Zorn
- Re: [TLS] Last Call: <draft-ietf-tls-ssl2-must-no… Sean Turner