Re: [TLS] Fwd: New Version Notification for draft-wood-tls-ticketrequests-00.txt

Martin Thomson <martin.thomson@gmail.com> Fri, 13 April 2018 03:53 UTC

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From: Martin Thomson <martin.thomson@gmail.com>
Date: Fri, 13 Apr 2018 13:53:37 +1000
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To: Chris Wood <cawood@apple.com>
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Subject: Re: [TLS] Fwd: New Version Notification for draft-wood-tls-ticketrequests-00.txt
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Scrub the bit about needing the extension.  I read past Section 4
completely.  The other comments are still relevant.

On Fri, Apr 13, 2018 at 1:49 PM, Martin Thomson
<martin.thomson@gmail.com> wrote:
> Hi Chris,
>
> Thanks for sharing this.  It's a simple idea and seems generally useful.
>
> Do you have a use for the identifier and context?  I can see that
> without them there is no way to distinguish between a response to a
> request and spontaneous ticket issuance, but I just can't see how that
> is a problem.
>
> I think that you want an extension for this.  Otherwise, the server is
> going to explode when it sees a TicketRequest message.
>
> If you have an extension, then negotiating that extension might be
> used suppress spontaneous ticket issuance.  That has a catch though:
> then a server can't issue new tickets that bind to updated state (such
> as might happen after a connection migration in QUIC).  I don't know
> how much people care about that trade-off.
>
> Sorry I didn't catch these before.
>
> Cheers,
> Martin
>
> On Fri, Apr 13, 2018 at 1:15 PM, Chris Wood <cawood@apple.com> wrote:
>> Hi everyone,
>>
>> Below is a pointer to a new I-D describing an approach for clients to
>> request session tickets via a new post-handshake message. This is useful for
>> applications that perform parallel connection establishment and racing,
>> e.g., via Happy Eyeballs. It should also help reduce ticket waste. More uses
>> and details are given in the document.
>>
>> We would very much appreciate feedback on the mechanism utility and design.
>>
>> Best,
>> Chris
>>
>> Begin forwarded message:
>>
>> From: internet-drafts@ietf.org
>> Date: April 12, 2018 at 8:07:35 PM PDT
>> To: David Schinazi <dschinazi@apple.com>, Christopher Wood
>> <cawood@apple.com>, Tommy Pauly <tpauly@apple.com>, "Christopher A. Wood"
>> <cawood@apple.com>
>> Subject: New Version Notification for draft-wood-tls-ticketrequests-00.txt
>>
>>
>> A new version of I-D, draft-wood-tls-ticketrequests-00.txt
>> has been successfully submitted by Christopher A. Wood and posted to the
>> IETF repository.
>>
>> Name:        draft-wood-tls-ticketrequests
>> Revision:    00
>> Title:        TLS Ticket Requests
>> Document date:    2018-04-12
>> Group:        Individual Submission
>> Pages:        6
>> URL:
>> https://www.ietf..org/internet-drafts/draft-wood-tls-ticketrequests-00.txt
>> Status:
>> https://datatracker.ietf.org/doc/draft-wood-tls-ticketrequests/
>> Htmlized:       https://tools.ietf.org/html/draft-wood-tls-ticketrequests-00
>> Htmlized:
>> https://datatracker.ietf.org/doc/html/draft-wood-tls-ticketrequests
>>
>>
>> Abstract:
>>   TLS session tickets enable stateless connection resumption for
>>   clients without server-side per-client state.  Servers vend session
>>   tickets to clients, at their discretion, upon connection
>>   establishment.  Clients store and use tickets when resuming future
>>   connections.  Moreover, clients should use tickets at most once for
>>   session resumption, especially if such keying material protects early
>>   application data.  Single-use tickets bound the number of parallel
>>   connections a client may initiate by the number of tickets received
>>   from a given server.  To address this limitation, this document
>>   describes a mechanism by which clients may request tickets as needed
>>   during a connection.
>>
>>
>>
>>
>> Please note that it may take a couple of minutes from the time of submission
>> until the htmlized version and diff are available at tools.ietf.org.
>>
>> The IETF Secretariat
>>
>>
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>>