OASIS eXtensible Access Control Markup Language (XACML) TC

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Re: [xacml] xacml combiner alg extension points

  • 1.  Re: [xacml] xacml combiner alg extension points

    Posted 02-03-2004 16:06
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    Subject: Re: [xacml] xacml combiner alg extension points


    
    On Tue, 3 Feb 2004, Michiharu Kudoh wrote:
    
    > Hi, Polar, Simon
    >
    > Is the following example what you are suggesting?
    >
    > <Policy algid="priority-rule-combo-algo">
    >   <CombinerParameters>
    >     <CombinerParameter ParameterName="priority">10
    >     </CombinerParameter>
    >     <CombinerParameter ParameterName="priority">5
    >     </CombinerParameter>
    >   </CombinerParameters>
    >   <Rule effect="permit">... rule 1...</Rule>
    >   <Rule effect="permit">... rule 2 ...</Rule>
    > </Policy>
    >
    > (The first rule has priority 10 and the second rule has priority 5)
    > If so, this would satisfy my requirements.
    
    As long as it is understood that the above approach is just one approach,
    depending on how you define your combining algorithm.
    
    <Policy algid="priority-rule-combo-algo2">
      <CombinerParameters>
        <CombinerParameter ParameterName="priority">10
        </CombinerParameter>
      </CombinerParameters>
      <Rule effect="permit">... rule 1...</Rule>
      <CombinerParameters>
        <CombinerParameter ParameterName="priority">5
        </CombinerParameter>
      </CombinerParameters>
      <Rule effect="permit">... rule 2 ...</Rule>
    </Policy>
    
    In general is another valid approach.
    Are we agreed?
    
    A syntax clarification related to types. Must a CombinerParameter of a
    integer value represented as an AttributeValue? Sucb as:
    
      <CombinerParameters>
        <CombinerParameter ParameterName="priority">
           <AttributeValue DataType="....#integer">10</AttributeValue>
        </CombinerParameter>
      </CombinerParameters>
    
    Should they be allowed to be expressions?
    
    Cheers,
    -Polar
    
    >
    > Best,
    > Michiharu
    >
    >
    >
    >
    >              "Simon Godik"
    >              <simon.godik@over
    >              xeer.com>                                                  To
    >                                        <xacml@lists.oasis-open.org>
    >              2004/02/03 16:28                                           cc
    >
    >                                                                    Subject
    >                                        [xacml] xacml combiner alg
    >                                        extension points
    >
    >
    >
    >
    >
    >
    >
    >
    >
    >
    > xacml extension points proposal.
    >
    > Polar pointed out that previous xacml extension proposal is somewhat
    > misleading with it's use of
    > @MustUnderstand attribute and where parameters are interpreted.
    >
    > Here is cleaned up version, hopefully.
    >
    > Proposal:
    >
    > Allow element of type <xacml:CombinerParametersType> as an optional child
    > of <xacml:PolicySet> and <xacml:Policy> elements.
    > <xacml:CombinerParameters> element contains a list of parameters specific
    > to the enclosing combining algorithm. Combiner parameters are input to the
    > combining algorithm only and can not be directly interpreted by the pdp.
    >
    > Schema:
    > <xs:element name="CombinerParameters" type="xacml:CombinerParametersType"/>
    > <xs:complexType name="CombinerParametersType">
    > <xs:sequence>
    > <xs:element ref="xacml:CombinerParameter" minOccurs="0"
    > maxOccurs="unbounded"/>
    > </xs:sequence>
    > </xs:complexType>
    > <!-- -->
    > <xs:element name="CombinerParameter" type="xacml:CombinerParameterType"/>
    > <xs:complexType name="CombinerParameterType">
    > <xs:sequence>
    > <xs:any namespace="##any" processContents="lax" minOccurs="0"
    > maxOccurs="unbounded"/>
    > </xs:sequence>
    > <xs:attribute name="ParameterName" type="string" use="required"/>
    > </xs:complexType>
    >
    > Simon
    >
    >
    >
    > To unsubscribe from this mailing list (and be removed from the roster of the OASIS TC), go to http://www.oasis-open.org/apps/org/workgroup/xacml/members/leave_workgroup.php.
    >
    


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