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authorizationxacmlabacalfawso2-identity-server

WSO2 Identity Server - Issues with XACML V.3 Policy Set under the Try-It of PAP

I'd like to add a policy set in order to run a series of policies in sequence using a target which defines if a given policy is applicable, or not, based on the input field "resource". To begin a test I wrote a single policySet that contains one policy.

The evaluation by the WSO2 PAP fails showing a result of "NotApplicable" while I expect to receive a "Permit".

Here the policy named "cfatest0" created in XML: 

<!--This file was generated by the ALFA Plugin for Eclipse from Axiomatics AB (http://www.axiomatics.com).  Any modification to this file will be lost upon recompilation of the source ALFA file-->
   <xacml3:Policy xmlns:xacml3="urn:oasis:names:tc:xacml:3.0:core:schema:wd-17"  PolicyId="cfatest0" RuleCombiningAlgId="urn:oasis:names:tc:xacml:3.0:rule-combining-algorithm:deny-overrides" Version="1.0">
      <xacml3:Description></xacml3:Description>
      <xacml3:PolicyDefaults>
         <xacml3:XPathVersion>http://www.w3.org/TR/1999/REC-xpath-19991116</xacml3:XPathVersion>
      </xacml3:PolicyDefaults>
      <xacml3:Target>
         <xacml3:AnyOf>
            <xacml3:AllOf>
               <xacml3:Match MatchId="urn:oasis:names:tc:xacml:1.0:function:string-equal">
                  <xacml3:AttributeValue DataType="http://www.w3.org/2001/XMLSchema#string">TPS_AE_REST_Policy</xacml3:AttributeValue>
                  <xacml3:AttributeDesignator AttributeId="urn:oasis:names:tc:xacml:1.0:resource:resource-id" DataType="http://www.w3.org/2001/XMLSchema#string" Category="urn:oasis:names:tc:xacml:3.0:attribute-category:resource" MustBePresent="false"></xacml3:AttributeDesignator>
               </xacml3:Match>
            </xacml3:AllOf>
         </xacml3:AnyOf>
      </xacml3:Target>
      <xacml3:Rule Effect="Permit" RuleId="http://axiomatics.com/alfa/identifier/com.red.XACML.permitAll">
         <xacml3:Description></xacml3:Description>
         <xacml3:Target></xacml3:Target>
      </xacml3:Rule>
      <xacml3:Rule Effect="Deny" RuleId="http://axiomatics.com/alfa/identifier/com.red.XACML.checkId">
         <xacml3:Description></xacml3:Description>
         <xacml3:Target></xacml3:Target>
         <xacml3:Condition>
            <xacml3:Apply FunctionId="urn:oasis:names:tc:xacml:1.0:function:not">
               <xacml3:Apply FunctionId="urn:oasis:names:tc:xacml:1.0:function:any-of">
                  <xacml3:Function FunctionId="urn:oasis:names:tc:xacml:1.0:function:string-equal"></xacml3:Function>
                  <xacml3:AttributeValue DataType="http://www.w3.org/2001/XMLSchema#string">[email protected]</xacml3:AttributeValue>
                  <xacml3:AttributeDesignator AttributeId="urn:oasis:names:tc:xacml:1.0:subject:subject-id" DataType="http://www.w3.org/2001/XMLSchema#string" Category="urn:oasis:names:tc:xacml:1.0:subject-category:access-subject" MustBePresent="false"></xacml3:AttributeDesignator>
               </xacml3:Apply>
            </xacml3:Apply>
         </xacml3:Condition>
         <xacml3:ObligationExpressions>
            <xacml3:ObligationExpression ObligationId="obligation.displayAttributes" FulfillOn="Deny">
               <xacml3:AttributeAssignmentExpression AttributeId="urn:oasis:names:tc:xacml:3.0:example:attribute:text" Category="urn:oasis:names:tc:xacml:1.0:subject-category:access-subject">
                  <xacml3:AttributeValue DataType="http://www.w3.org/2001/XMLSchema#string">Access denied due to invalid UserID</xacml3:AttributeValue>
               </xacml3:AttributeAssignmentExpression>
            </xacml3:ObligationExpression>
         </xacml3:ObligationExpressions>
      </xacml3:Rule>
      <xacml3:AdviceExpressions>
         <xacml3:AdviceExpression AdviceId="advice.displayAttributes" AppliesTo="Deny">
            <xacml3:AttributeAssignmentExpression AttributeId="urn:oasis:names:tc:xacml:3.0:example:attribute:text" Category="urn:oasis:names:tc:xacml:1.0:subject-category:access-subject">
               <xacml3:AttributeValue DataType="http://www.w3.org/2001/XMLSchema#string">Valid subjectId</xacml3:AttributeValue>
            </xacml3:AttributeAssignmentExpression>
         </xacml3:AdviceExpression>
         <xacml3:AdviceExpression AdviceId="advice.displayAttributes" AppliesTo="Permit">
            <xacml3:AttributeAssignmentExpression AttributeId="urn:oasis:names:tc:xacml:3.0:example:attribute:text" Category="urn:oasis:names:tc:xacml:1.0:subject-category:access-subject">
               <xacml3:AttributeValue DataType="http://www.w3.org/2001/XMLSchema#string">Valid subjectId</xacml3:AttributeValue>
            </xacml3:AttributeAssignmentExpression>
         </xacml3:AdviceExpression>
      </xacml3:AdviceExpressions>
   </xacml3:Policy>

Here the PolicySet named cfapolicyset1 created in XML: 

<!--This file was generated by the ALFA Plugin for Eclipse from Axiomatics AB (http://www.axiomatics.com).  Any modification to this file will be lost upon recompilation of the source ALFA file-->
   <xacml3:PolicySet xmlns:xacml3="urn:oasis:names:tc:xacml:3.0:core:schema:wd-17"  PolicySetId="cfapolicyset1" PolicyCombiningAlgId="urn:oasis:names:tc:xacml:3.0:policy-combining-algorithm:permit-overrides" Version="1.0">
      <xacml3:Description></xacml3:Description>
      <xacml3:PolicySetDefaults>
         <xacml3:XPathVersion>http://www.w3.org/TR/1999/REC-xpath-19991116</xacml3:XPathVersion>
      </xacml3:PolicySetDefaults>
      <xacml3:Target>
         <xacml3:AnyOf>
            <xacml3:AllOf>
               <xacml3:Match MatchId="urn:oasis:names:tc:xacml:1.0:function:string-equal">
                  <xacml3:AttributeValue DataType="http://www.w3.org/2001/XMLSchema#string">TPS_AE_REST_Policy</xacml3:AttributeValue>
                  <xacml3:AttributeDesignator AttributeId="urn:oasis:names:tc:xacml:1.0:resource:resource-id" DataType="http://www.w3.org/2001/XMLSchema#string" Category="urn:oasis:names:tc:xacml:3.0:attribute-category:resource" MustBePresent="false"></xacml3:AttributeDesignator>
               </xacml3:Match>
            </xacml3:AllOf>
         </xacml3:AnyOf>
      </xacml3:Target>
      <xacml3:PolicyIdReference>cfatest0</xacml3:PolicyIdReference>
   </xacml3:PolicySet>

Below the request generated by the WSO2 "Try-It" tool under the PAP: 

<Request xmlns="urn:oasis:names:tc:xacml:3.0:core:schema:wd-17" CombinedDecision="false" ReturnPolicyIdList="false">
    <Attributes Category="urn:oasis:names:tc:xacml:1.0:subject-category:access-subject">
        <Attribute AttributeId="urn:oasis:names:tc:xacml:1.0:subject:subject-id" IncludeInResult="false">
            <AttributeValue DataType="http://www.w3.org/2001/XMLSchema#string">[email protected]</AttributeValue>
        </Attribute>
    </Attributes>
    <Attributes Category="urn:oasis:names:tc:xacml:3.0:attribute-category:resource">
        <Attribute AttributeId="urn:oasis:names:tc:xacml:1.0:resource:resource-id" IncludeInResult="false">
            <AttributeValue DataType="http://www.w3.org/2001/XMLSchema#string">TPS_AE_REST_Policy</AttributeValue>
        </Attribute>
    </Attributes>
</Request>

Decision is: NotApplicable

Do I miss something in the way how I use to send a request to a PolicySet? When using the WSO2 high level policy editor, I get the same error at the response. When testing the policy isolated in the PAP "Try-It" tool, I receive the correct value, which for this policy is: "Permit".

Solution

  • I tried your request and policies inside the Axiomatics Policy Administration Point and I get the desired response i.e. Permit + Advice.

    Simulation result in the Axiomatics Policy Administration Point

    Could it be you forgot to load the policy inside WSO2IS?