Re: [websec] Strict-Transport-Security syntax redux
Adam Barth <ietf@adambarth.com> Sat, 29 October 2011 08:11 UTC
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From: Adam Barth <ietf@adambarth.com>
Date: Sat, 29 Oct 2011 01:10:30 -0700
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To: Julian Reschke <julian.reschke@gmx.de>
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Cc: IETF WebSec WG <websec@ietf.org>
Subject: Re: [websec] Strict-Transport-Security syntax redux
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On Sat, Oct 29, 2011 at 1:07 AM, Julian Reschke <julian.reschke@gmx.de> wrote: > On 2011-10-29 05:08, Adam Barth wrote: >> >> ... >>> >>> Except for RFC6265, which in the algorithm for parsing "Max-Age=", it >>> algorithmically provides for ignoring a value that doesn't match the >>> effective value ABNF of.. >>> >>> ["-"]*DIGIT >>> >>> ..which would catch the max-age="1" case, but doesn't seem to explicitly >>> address.. >>> >>> max-age= >> >> That's handled by some more general processing rules in the spec. The >> net result is that it's ignored. >> >>> But in any case, perhaps (additional) browser implementor folk could >>> chime >>> in here -- do we really need to address such detail-level issues (both of >>> the examples above and below) in the syntax/grammar we specify in specs >>> such >>> as these? Or is the new ABNF proposed in the original message in this >>> thread >>> sufficient? >> >> Generally, we prefer to be instructed exactly how to behave for every >> possible input (even illegal ones). There's a long history of >> quoted-string not being implemented correctly by browsers. I spec >> this as just splitting the string on ; and then processing each >> substring separately, ignoring bogus/future ones. I know Julian has a >> dream that all HTTP headers will be parsed the same, but quoted-string >> is sufficiently ill-defined w.r.t. error handling that I prefer to >> avoid it. >> ... > > - when discussing generic parsing, we need to distinguish between legacy > cases like cookies, and new headers, where we can do better > > - standardizing handling of broken headers is one thing (and in general I > prefer not to), but that doesn't mean that when defining a new header field > we shouldn't minimize the things a sender can get wrong; if we know that > some recipients will accept both token and quoted-string anyway, then it > seems like a good thing to simply allow them both, reducing the number of > special-cases in parsing > > - not sure what you mean by "ill-defined w.r.t. error handling"; it's > defined just like most other syntax elements in HTTP -- is there something > *specific* to quoted-string you have in mind? Most of HTTP is ill-defined w.r.t. error handling. We muddle through with reverse engineering. Adam
- [websec] Strict-Transport-Security syntax redux Ryan Sleevi
- Re: [websec] Strict-Transport-Security syntax red… =JeffH
- Re: [websec] Strict-Transport-Security syntax red… Julian Reschke
- Re: [websec] Strict-Transport-Security syntax red… Julian Reschke
- [websec] Strict-Transport-Security syntax redux =JeffH
- Re: [websec] Strict-Transport-Security syntax red… Julian Reschke
- Re: [websec] Strict-Transport-Security syntax red… Adam Barth
- Re: [websec] Strict-Transport-Security syntax red… =JeffH
- Re: [websec] Strict-Transport-Security syntax red… =JeffH
- Re: [websec] Strict-Transport-Security syntax red… Adam Barth
- Re: [websec] Strict-Transport-Security syntax red… Julian Reschke
- Re: [websec] Strict-Transport-Security syntax red… Julian Reschke
- Re: [websec] Strict-Transport-Security syntax red… Julian Reschke
- Re: [websec] Strict-Transport-Security syntax red… Adam Barth
- Re: [websec] Strict-Transport-Security syntax red… Julian Reschke
- Re: [websec] Strict-Transport-Security syntax red… Adam Barth
- Re: [websec] Strict-Transport-Security syntax red… Julian Reschke
- Re: [websec] Strict-Transport-Security syntax red… Phillip Hallam-Baker
- Re: [websec] Strict-Transport-Security syntax red… Adam Barth
- Re: [websec] Strict-Transport-Security syntax red… Adam Barth
- Re: [websec] Strict-Transport-Security syntax red… Bjoern Hoehrmann
- Re: [websec] Strict-Transport-Security syntax red… Phillip Hallam-Baker
- Re: [websec] Strict-Transport-Security syntax red… Julian Reschke
- Re: [websec] Strict-Transport-Security syntax red… Adam Barth
- Re: [websec] Strict-Transport-Security syntax red… Julian Reschke
- Re: [websec] Strict-Transport-Security syntax red… Adam Barth
- Re: [websec] Strict-Transport-Security syntax red… Julian Reschke
- Re: [websec] Strict-Transport-Security syntax red… Adam Barth
- Re: [websec] Strict-Transport-Security syntax red… Julian Reschke
- Re: [websec] Strict-Transport-Security syntax red… Adam Barth
- Re: [websec] Strict-Transport-Security syntax red… =JeffH
- Re: [websec] Strict-Transport-Security syntax red… Adam Barth
- Re: [websec] Strict-Transport-Security syntax red… Roy T. Fielding
- Re: [websec] Strict-Transport-Security syntax red… Adam Barth
- Re: [websec] Strict-Transport-Security syntax red… Julian Reschke
- Re: [websec] Strict-Transport-Security syntax red… Adam Barth
- Re: [websec] Strict-Transport-Security syntax red… Julian Reschke
- Re: [websec] Strict-Transport-Security syntax red… Adam Barth
- Re: [websec] Strict-Transport-Security syntax red… Julian Reschke
- Re: [websec] Strict-Transport-Security syntax red… Adam Barth
- Re: [websec] Strict-Transport-Security syntax red… Tobias Gondrom
- Re: [websec] Strict-Transport-Security syntax red… Anne van Kesteren
- Re: [websec] Strict-Transport-Security syntax red… Julian Reschke
- Re: [websec] Strict-Transport-Security syntax red… Paul Hoffman
- Re: [websec] Strict-Transport-Security syntax red… Anne van Kesteren
- Re: [websec] Strict-Transport-Security syntax red… Julian Reschke
- Re: [websec] Strict-Transport-Security syntax red… Anne van Kesteren
- Re: [websec] Strict-Transport-Security syntax red… Julian Reschke
- Re: [websec] Strict-Transport-Security syntax red… Bjoern Hoehrmann
- Re: [websec] Strict-Transport-Security syntax red… Adam Barth
- Re: [websec] Strict-Transport-Security syntax red… Julian Reschke
- Re: [websec] Strict-Transport-Security syntax red… Paul Hoffman
- Re: [websec] Strict-Transport-Security syntax red… Julian Reschke
- Re: [websec] Strict-Transport-Security syntax red… Marsh Ray
- Re: [websec] Strict-Transport-Security syntax red… Julian Reschke
- Re: [websec] Strict-Transport-Security syntax red… Bjoern Hoehrmann