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Message from discussion Content Security Policy Spec questions and feedback
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Gervase Markham  
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 More options Jul 9 2009, 7:01 am
Newsgroups: mozilla.dev.security
From: Gervase Markham <g...@mozilla.org>
Date: Thu, 09 Jul 2009 12:01:05 +0100
Local: Thurs, Jul 9 2009 7:01 am
Subject: Re: Content Security Policy Spec questions and feedback
On 08/07/09 18:22, Bil Corry wrote:

> If the hosting company is providing an interface to add one or more
> additional CSP headers, then wouldn't it be just as easy for them to
> provide an interface that constructs a single header?

The scenario here is that they have a set policy, which an individual
site owner is permitted to tighten but not loosen. To do that by editing
one header would mean that either they'd need to post-check the header
to make sure it was no looser than the original, or they'd need to
implement the header-merging logic which would otherwise be in the
client. Which means N implementations of header merging, some buggy,
rather than one.

Header-merging logic in the client should just be a case of setting bits
to 1 and not letting them get set back to 0 again. That can't be that hard.

Gerv


 
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