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Re: [UMP] Feedback on UMP from a quick read

From: Tyler Close <tyler.close@gmail.com>
Date: Sat, 9 Jan 2010 14:39:18 -0800
Message-ID: <5691356f1001091439h75d78b76h16ef53439499ab52@mail.gmail.com>
To: Adam Barth <w3c@adambarth.com>
Cc: public-webapps <public-webapps@w3.org>
On Sat, Jan 9, 2010 at 2:23 PM, Adam Barth <w3c@adambarth.com> wrote:
> On Sat, Jan 9, 2010 at 1:57 PM, Tyler Close <tyler.close@gmail.com> wrote:
>> On Sat, Jan 9, 2010 at 10:20 AM, Adam Barth <w3c@adambarth.com> wrote:
>>> That's the security model we have.  For example, it's safe to return
>>> untrusted HTML tags with certain media types but not with others.
>>
>> Just because the Same Origin Policy is full of bizarre gotchas doesn't
>> mean the UMP must also be. Using the UMP with permission tokens
>> eliminates several of the gotchas. I'm taking every opportunity I can
>> to provide developers with a more reasonable security model. Surely a
>> security expert must applaud this effort.
>
> You're making the security model *weaker* though.  Why not make it stronger?
>
> Your reaction to a small (i.e., partial) leak of information in one
> media type is to open the floodgates for leaking all information about
> all media types.  That doesn't make any sense.

Originally, you characterized your scenario as obscure. Now you say
it's opening the floodgates. I don't find your frequent outbursts of
hyperbole at all constructive. Others have pointed this out more
subtly, but I guess you didn't get the hint.

In any case, I thought following of non-uniform redirects was the
original semantics introduced by CORS and so decided to retain it.
Like I said in the last email, I am reconsidering that based on
Maciej's correction.

And just to be clear. In no reasonable way can either decision be said
to "open the floodgates". I also don't see any reasonable way to
conclude that the UMP security model is weaker than CORS. Those are
some pretty outlandish claims to try to prove.

--Tyler

-- 
"Waterken News: Capability security on the Web"
http://waterken.sourceforge.net/recent.html
Received on Saturday, 9 January 2010 22:39:51 GMT

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