Re: [websec] Strict-Transport-Security syntax redux
Julian Reschke <julian.reschke@gmx.de> Sat, 29 October 2011 08:19 UTC
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Date: Sat, 29 Oct 2011 10:19:30 +0200
From: Julian Reschke <julian.reschke@gmx.de>
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To: Adam Barth <ietf@adambarth.com>
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Subject: Re: [websec] Strict-Transport-Security syntax redux
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On 2011-10-29 10:10, Adam Barth wrote: > 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. > ... It's not ill-defined, but undefined (by design) - see <http://trac.tools.ietf.org/wg/httpbis/trac/ticket/186>. What I was trying to understand whether there's something special with respect to quoted-string? Best regards, Julian
- [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