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Subject: Re: [xacml] Dynamic Attributes versus Existing Attributes

Ok, so itâs effectively ignore-others (allows for order variance)âcorrect?



> On Sep 14, 2021, at 2:45 PM, Steven Legg <steven.legg@viewds.com> wrote:
> ï
> Hi Bill,
>> On 15/09/2021 12:46 am, William Parducci wrote:
>> Hi Steven,
>> If itâs possible for multiple dynamic attributes to exist in the decision context how do you see ignore-initial-values obligation working? Wouldnât there have to be arbitration amongst those as well?
> Like the exclude-all-values obligation, an ignore-initial-values obligation would nominate
> a single attribute by category, attribute ID, data-type and optional issuer. So each attribute
> type would be considered separately. Informally, the ignore-initial-values obligation would
> instruct the context handler to ignore any initial attribute values that would have been
> selected by an attribute designator with the same category, attribute ID, data-type and
> optional issuer.
> Regards,
> Steven
>> thanks
>> b
>>>> On Sep 9, 2021, at 10:40 PM, Steven Legg <steven.legg@viewds.com <mailto:steven.legg@viewds.com>> wrote:
>>> All,
>>> I've been considering the issue of how to handle dynamic attributes generated by the Dynamic
>>> Attribute Authority that are attributes already in the request context (see Section 3.4 of
>>> https://www.oasis-open.org/apps/org/workgroup/xacml/download.php/68861/xacml-3.0-dyn-attr-v1.0-wd03.docx <https://www.oasis-open.org/apps/org/workgroup/xacml/download.php/68861/xacml-3.0-dyn-attr-v1.0-wd03.docx> ).
>>> The three main options are "merge", "dynamic attribute overrides" and "existing attribute
>>> overrides". There are straightforward ways to get the effect of "merge" or "existing attribute
>>> overrides", whatever the default behaviour, by judicious use of the issuer field and the
>>> existing DAA obligations, but not in the case of "dynamic attribute overrides". This would
>>> suggest that "dynamic attribute overrides" should be the default, though it feels a bit like a
>>> sledgehammer and isn't the path of least resistance.
>>> XACML allows the same attribute to appear multiple times in the request, with one or more
>>> possibly-duplicated attribute values in each instance, so tacking on a few more generated by
>>> the DAA is trivially easy and is likely to involve the least disruption to existing context
>>> handler implementations. This is the "merge" option. The current DAA draft merges while
>>> avoiding adding duplicate values, but it would be simpler to not worry about duplicates since
>>> they rarely matter and there are a few ways to avoid them if required.
>>> If "merge" is the default then I would propose adding a new obligation so as to get the effect
>>> of "dynamic attribute overrides" when desired. Call it the ignore-initial-values obligation.
>>> It would have the same components as the exclude-all-values obligation and its effect would be
>>> to cause the context handler the exclude any original values of the nominated attribute from
>>> the request context.
>>> If I don't hear any arguments to the contrary, in the next DAA draft I will keep "merge" as
>>> the nominal behaviour, except in the presence of an ignore-initial-values obligation, and drop
>>> the need to check for duplicates. I'll add a non-normative section on ways to get the
>>> different behaviours.
>>> Regards,
>>> Steven
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