Re: [Extra] draft-ietf-extra-imap4rev2-04 review
Alexey Melnikov <alexey.melnikov@isode.com> Wed, 30 October 2019 10:58 UTC
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To: Chris Newman <chris.newman@oracle.com>, Ned Freed <ned.freed@oracle.com>
Cc: extra@ietf.org, Timo Sirainen <tss@iki.fi>
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From: Alexey Melnikov <alexey.melnikov@isode.com>
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Date: Wed, 30 Oct 2019 10:58:11 +0000
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Subject: Re: [Extra] draft-ietf-extra-imap4rev2-04 review
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On 26/03/2019 15:42, Chris Newman wrote: > On 26 Mar 2019, at 15:13, Ned Freed wrote: >>> On 25 Mar 2019, at 13:04, Timo Sirainen wrote: >>> >> 3.4. Logout State >>> >> >>> > >>> >> A server MUST NOT unilaterally close the connection without >>> >> sending >>> >> an untagged BYE response that contains the reason for having done >>> >> so. >>> > >>> > Also already in RFC 3501, but this MUST NOT has to be violated >>> > sometimes. For example otherwise it would allow client to FETCH a >>> > large message and keep reading it very very slowly over days, and >>> > server wouldn't be allowed to disconnect it, because it can't send >>> BYE >>> > in the middle of the large mail literal. >> >>> Another example is if a client gets hung up (or goes silently offline) >>> during a TLS negotiation. The server has to eventually timeout the >>> connection but it would be semantically wrong to send a "* BYE" since >>> there's no data channel. One case where this happened was when our SSL >>> stack dropped support for an SSLv2-compatible hello (allowed by RFC >>> 6176), but some very old client kept sending such a hello >>> (prohibited by >>> RFC 6176). Incidentally, SSLv2 is completely incompatible with SSLv3 so >>> the client sends something that's not sufficient to complete an SSLv3 >>> packet so both ends get stuck waiting until one side hangs up. >> >> There was a suggestion (I think) during the meeting that this should >> be handled >> by sending the TLS equivalent of "* BYE". Which sounds fine in >> theory, but as >> said at the time, I'm skeptical that many/most TLS implementations >> provide >> implementors with the means to conveniently do that. > > I didn't hear such a suggestion. I made the observation that a wedged > TLS negotiation is a scenario where sending "* BYE" shouldn't be done. > It was suggested that example be mentioned in the document. I did not > mention the fact that TLS has it's own alert syntax that could be used > instead of "* BYE" -- I agree discussing that would be a bad idea. To followup on this: I've changed "MUST NOT unilaterally close the connection without sending BYE" to "SHOULD NOT ...". Do people think this is sufficient? Best Regards, Alexey
- [Extra] draft-ietf-extra-imap4rev2-04 review Timo Sirainen
- Re: [Extra] draft-ietf-extra-imap4rev2-04 review Bron Gondwana
- Re: [Extra] draft-ietf-extra-imap4rev2-04 review Chris Newman
- [Extra] Search in IMAP4rev2 (was Re: draft-ietf-e… Chris Newman
- Re: [Extra] draft-ietf-extra-imap4rev2-04 review Ned Freed
- Re: [Extra] draft-ietf-extra-imap4rev2-04 review Chris Newman
- Re: [Extra] draft-ietf-extra-imap4rev2-04 review Alexey Melnikov
- Re: [Extra] draft-ietf-extra-imap4rev2-04 review Chris Newman