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Re: Make JBossPDP an interface to allow easier insertion of custom PDP.
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created by <a href="http://community.jboss.org/people/bkrisler">Brian Krisler</a> in <i>PicketBox Development</i> - <a href="http://community.jboss.org/message/560787#560787">View the full discussion</a>
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<div class="jive-rendered-content"><p>What I mean by attributes for a subject is the following.</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>At the moment, this is a typical policy subject block from a request:</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><pre class="jive-pre"><code class="jive-code jive-xml"><span class="jive-xml-tag"><Subject></span>
  <span class="jive-xml-tag"><SubjectMatch MatchId="urn:oasis:names:tc:xacml:1.0:function:string-equal"></span>
    <span class="jive-xml-tag"><span><AttributeValue DataType="</span><a class="jive-link-external-small" href="http://www.w3.org/2001/XMLSchema#string" target="_blank">http://www.w3.org/2001/XMLSchema#string</a><span>"></span></span>Manager<span class="jive-xml-tag"></AttributeValue></span>
    <span class="jive-xml-tag"><span><SubjectAttributeDesignator AttributeId="urn:oasis:names:tc:xacml:2.0:subject:role"
                                                DataType="</span><a class="jive-link-external-small" href="http://www.w3.org/2001/XMLSchema#string" target="_blank">http://www.w3.org/2001/XMLSchema#string</a><span>" /></span></span>
   <span class="jive-xml-tag"></SubjectMatch></span>
   <span class="jive-xml-tag"><SubjectMatch MatchId="urn:oasis:names:tc:xacml:1.0:function:string-equal"></span>
     <span class="jive-xml-tag"><span><AttributeValue DataType="</span><a class="jive-link-external-small" href="http://www.w3.org/2001/XMLSchema#string" target="_blank">http://www.w3.org/2001/XMLSchema#string</a><span>"></span></span>Developer<span class="jive-xml-tag"></AttributeValue></span>
     <span class="jive-xml-tag"><span><SubjectAttributeDesignator AttributeId="urn:oasis:names:tc:xacml:2.0:subject:role"
                                                 DataType="</span><a class="jive-link-external-small" href="http://www.w3.org/2001/XMLSchema#string" target="_blank">http://www.w3.org/2001/XMLSchema#string</a><span>" /></span></span>
   <span class="jive-xml-tag"></SubjectMatch></span>
<span class="jive-xml-tag"></Subject></span>
</code></pre><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>When a request is made against this policy, it would be in the form of a user id (Bob) and his roles (Manager), this is supporting role-based authorization.  However for attribute-based authorization, the policy would look more like:</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><pre class="jive-pre"><code class="jive-code jive-xml"><span class="jive-xml-tag"><Subject></span>
  <span class="jive-xml-tag"><SubjectMatch MatchId="urn:oasis:names:tc:xacml:1.0:function:boolean-equal"></span>
    <span class="jive-xml-tag"><span><AttributeValue DataType="</span><a class="jive-link-external-small" href="http://www.w3.org/2001/XMLSchema#boolean" target="_blank">http://www.w3.org/2001/XMLSchema#boolean</a><span>"></span></span>true<span class="jive-xml-tag"></AttributeValue></span>
    <span class="jive-xml-tag"><span><SubjectAttributeDesignator AttributeId="urn:my-org:manager:attribute"
                                                DataType="</span><a class="jive-link-external-small" href="http://www.w3.org/2001/XMLSchema#boolean" target="_blank">http://www.w3.org/2001/XMLSchema#boolean</a><span>" /></span></span>
   <span class="jive-xml-tag"></SubjectMatch></span>
   <span class="jive-xml-tag"><SubjectMatch MatchId="urn:oasis:names:tc:xacml:1.0:function:boolean-equal"></span>
     <span class="jive-xml-tag"><span><AttributeValue DataType="</span><a class="jive-link-external-small" href="http://www.w3.org/2001/XMLSchema#boolean" target="_blank">http://www.w3.org/2001/XMLSchema#boolean</a><span>"></span></span>true<span class="jive-xml-tag"></AttributeValue></span>
     <span class="jive-xml-tag"><span><SubjectAttributeDesignator AttributeId="urn:my-org:developer:attribute"
                                                 DataType="</span><a class="jive-link-external-small" href="http://www.w3.org/2001/XMLSchema#boolean" target="_blank">http://www.w3.org/2001/XMLSchema#boolean</a><span>" /></span></span>
   <span class="jive-xml-tag"></SubjectMatch></span>
<span class="jive-xml-tag"></Subject></span></code></pre><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>When a request is made against the attribute-based policy the requestor would pass in a list of values as such:</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>urn:my-org:manager:attribute = true</p><p>urn:my-org:developer:attribute = false</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>In a review of the existing code (EJBXACMLUtil,java for example), it does not allow for such attribute-based values. Instead, it loops over the provided roles and creates the attributes based on the ATTRIBUTEID_ROLE constant.</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><pre class="jive-pre"><code class="jive-code jive-java">List<Role> rolesList = callerRoles.getRoles();
<font color="navy"><b>if</b></font>(rolesList != <font color="navy"><b>null</b></font>)
<font color="navy">{</font>
   <font color="navy"><b>for</b></font>(Role role:rolesList)
   <font color="navy">{</font>
      String roleName = role.getRoleName();
      AttributeType attSubjectID = RequestAttributeFactory.createStringAttributeType(
            XACMLConstants.ATTRIBUTEID_ROLE, <font color="red">"jboss.org"</font>, roleName);
      subject.getAttribute().add(attSubjectID);
   <font color="navy">}</font>
<font color="navy">}</font>
</code></pre><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>An other issue is that the construction of the request is dependent upon the Principal for setting of the subject-id value. We are working on a model where there will never be a Princial object to extract a subject-id. In our case, we will instead pass in a set of attributes for evaluation.</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Upon further review, it might just be the helper methods (EJBXAMLUtil and WebXACMLUtil) that will require much modification. The addition of a second method in the util objects for creating of these attribute based request objects might just work.  I have not fully reviewed the policy application code in detail yet, but from a cursory glance it appears to be attribute-id agnostic and will just create a Set of attribute/value pairs and then upon validation, apply the proper attribute function.</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Brian</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Message was edited by: Brian Krisler  -- Tried to fix XML formatting.</p></div>
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