W3C home > Mailing lists > Public > public-rww@w3.org > November 2012

Re: AccessControl : update + inference

From: Michiel de Jong <michiel@unhosted.org>
Date: Tue, 13 Nov 2012 09:18:22 +0800
Message-ID: <CA+aD3u1jEFS-qtWfG-k=wPyATZ96NRXYBSgij1e8aEMCJ=VO9Q@mail.gmail.com>
To: public-rww@w3.org
i feel the LDP page misses the point. it describes ways in which you
can use, say, an Oracle database, to describe if certain credentials
which the client sent are sufficient for a certain action or not. What
they don't describe is how the client can actually send these
credentials, and how the server can check their validity.

Let's look at the basic use case first: Alice has a website, and Bob
is allowed to edit it.

No irrelevant things about 'Bob is within a 500m radius of a certain
geo location' or 'Alice uses an Oracle database to run her website'.
Imho that misses the point. There is a small note at the bottom of the
LDP page saying "identity: WebID". That is what we should be looking
at, i think:

1) how does Bob send his credentials
2) how does Alice's web server check them

For this, i'm aware of the following options:

- username/password (doesn't scale of course if Bob has many friends)
- WebID (favourite of this CG!)
- OpenID (sadly probably deprecated)
- Persona (promising imho)
- Dialback (same)
- Salmon (specific for blogpost-comments, and probably deprecated by dialback?)


My 2ct,
Michiel

On Tue, Nov 13, 2012 at 7:27 AM, Kingsley Idehen <kidehen@openlinksw.com> wrote:
> On 11/12/12 5:19 PM, Andrei SAMBRA wrote:
>
> Actually, I wonder if it would be a better idea to move this wiki page (on
> AC) to the RWW wiki, given that it is orthogonal to LDP WG's work. I'll
> create the stub wiki page and post the link in a reply.
>
> +1
>
> Kingsley
>
>
> Andrei
>
>
> On Mon, Nov 12, 2012 at 5:16 PM, Kingsley Idehen <kidehen@openlinksw.com>
> wrote:
>>
>> On 11/12/12 4:52 PM, Jürgen Jakobitsch wrote:
>>>
>>> hi,
>>>
>>> since the discussion on AC is apparently taking shape, it might be a
>>> good time for my questions.
>>>
>>> until now we more or less only had examples of AC in action on the
>>> data-retrieval side (as far as i know at least).
>>>
>>> do acl-engines only really work with inference-engines when updating or
>>> are there recommended ways of dealing with the following example?
>>>
>>> prereq.: acl - denies access to resource "x" (say a skos:Concept)
>>>
>>> what should happen, when i add the triple?
>>>
>>> resource "y" skos:broader resource "x"?
>>>
>>>
>>> there are several scenarios in which this could take place :
>>>
>>> 1. should the update request be rejected with full inferencing, because
>>> it becomes clear the resource "x" is touched?
>>> 2. what happens in a non-inferencing environment? with that is created a
>>> relation between the two resources and i could construct (sparql-wise)
>>> whatever i want, which brings me to the idea of never trusting
>>> application/sparql-results+*...
>>>
>>>
>>> so the crucial point seems to be that ACLs can handle updates more
>>> flexible, a read and write access denied for a single resource might not
>>> be enough.
>>>
>>> any pointer to the most flexible acl-ontology?
>>> i'm thinking about something like :
>>>
>>> denyWriteAccess where resource "x" is the object.
>>>
>>> any pointer really appreciated..
>>
>>
>> We we do is have SPARQL ASK as an option for determining conditions. That
>> way, you handle all your desired scenarios as the data (resource) publisher.
>> Basically, we offer:
>>
>> 1. basic WebID lists
>> 2. WebIDs as members of foaf:Groups
>> 3. SPARQL ASK -- for most complex conditions and custom conditions.
>>
>> As for inference, we have this loosely bound to the SPARQL processor which
>> is why we use pragmas to enable inference context in our SPARQL
>> implementation. I know of not other way to handle the contextual fluidity
>> associated with this subject matter :-)
>>>
>>>
>>> wkr turnguard
>>>
>>>
>>>
>>>
>>>
>>
>>
>> --
>>
>> Regards,
>>
>> Kingsley Idehen
>> Founder & CEO
>> OpenLink Software
>> Company Web: http://www.openlinksw.com
>> Personal Weblog: http://www.openlinksw.com/blog/~kidehen
>> Twitter/Identi.ca handle: @kidehen
>> Google+ Profile: https://plus.google.com/112399767740508618350/about
>> LinkedIn Profile: http://www.linkedin.com/in/kidehen
>>
>>
>>
>>
>>
>
>
>
> --
>
> Regards,
>
> Kingsley Idehen	
> Founder & CEO
> OpenLink Software
> Company Web: http://www.openlinksw.com
> Personal Weblog: http://www.openlinksw.com/blog/~kidehen
> Twitter/Identi.ca handle: @kidehen
> Google+ Profile: https://plus.google.com/112399767740508618350/about
> LinkedIn Profile: http://www.linkedin.com/in/kidehen
>
>
>
>
Received on Tuesday, 13 November 2012 01:18:50 GMT

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