Re: [http-state] Security considerations overview

Mark Pauley <mpauley@apple.com> Wed, 03 March 2010 23:38 UTC

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From: Mark Pauley <mpauley@apple.com>
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Date: Wed, 03 Mar 2010 15:38:19 -0800
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To: Mark Pauley <mpauley@apple.com>
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Subject: Re: [http-state] Security considerations overview
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It would appear that this is covered by 4.1.2.2

We (and many other browsers) do allow setting a cookie with domain .bar.example.com from .foo.example.com

Indeed, some web applications rely on this behavior.  The compromise is that we'll allow .foo.example.com to set a cookie for .bar.example.com if and only if .example.com is not a Top Level (or registry controlled) Domain.


On Mar 3, 2010, at 3:32 PM, Mark Pauley wrote:

> Excuse my ignorance, I've just recently joined this list.
> 
> Is this the correct forum to enquire about what we refer to as the 'Cross Site Acceptance Policy'?  We (Safari / CFNetwork) by default refuse to set cookies from hosts from a domain tree outside of the current Top Level Domain tree.  That is from a host with name x1.x2.x3...x_k  we'll set a cookie with domain .y1.y2.y3...y_m if and only if y_m == x_k, y_m-1 == x_k-1, etc to y_m-n == x_k-n and y1....y_m-n is not a top level domain.  
> 
> That is, if the domain is at least a cousin; the target domain shares a common ancestor with the origin domain which is not a Top Level Domain.
> 
> We've worked out that this is probably the most restrictive definition that will work given a good enough description of what a Top Level Domain is (which we have thanks to the Mozilla Top Level Domain list project).
> 
> 
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