[Standards] Addressing Security Concerns in XEP-0115 Entity Capabilities

Joe Hildebrand joe.hildebrand at webex.com
Wed Sep 7 20:38:34 UTC 2011

On 9/5/11 1:54 PM, "Dave Cridland" <dave at cridland.net> wrote:

>>> Let's say that we add (yet) another attribute to the caps element,
>>> indicating that the "new" restrictions are in place. (These might  include
>>> the various restrictions mentioned in this thread).
>>> Now, when a client sees a caps marked as restricted, it can validate the
>>> disco#info it gets.
>>> If a client sees two caps strings, one marked as restricted and  one not, it
>>> should assume that the caps string is intended to be restricted  as proceed
>>> accordingly.
>> That's a fairly interesting idea. More thinking required.
> Right, it's not a fully fleshed-out solution, for sure.

Granted I might not have read the entire thread closely enough, I don't
think anyone has suggested the massive-hack approach recently:

REQUIRE marker entries that always sort to the end of each section, perhaps
by starting with a nice high codepoint.  PROHIBIT any entry that sorts
higher.  REJECT (and negatively cache) any response that doesn't meet these

You might even choose a different marker entry for each section.  Old
software would still work.  New software could decide how much policy to

Joe Hildebrand

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