Multiple Decisions Profile Policy in XACML 3.0

StackOverflow https://stackoverflow.com/questions/21275421

Question

I have requirement to write a policy for the particular user it will return the xacml response like this :

This policy is based on single user : bob 

FirstName: Create= true , Read = true, Update = true, Delete = false 
MiddleName:  Create= true , Read = true, Update = true, Delete = false   
LastName: Create= true , Read = true, Update = true, Delete = false

How to write a xacml policy for such requirement and how the request will look like for the same policy.

How to achieve this policy using Axiomatics Alfa plugin and WSO2 identity server.

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Solution

Let get as following... This policy is based on single user : bob 

FirstName: Create= true , Read = true, Update = true, Delete = false 
MiddleName:  Create= true , Read = true, Update = false, Delete = false   
LastName: Create= false , Read = true, Update = false, Delete = false

Following is the policy, policy is based on user ("bob"). Therefore we can take the user name as the policy target and can create three rules. In rules, "FirstName", "MiddleName" and "LastName" have been taken as resources and for each resource, rule has been created.

<Policy xmlns="urn:oasis:names:tc:xacml:3.0:core:schema:wd-17"  PolicyId="NamePolicy" RuleCombiningAlgId="urn:oasis:names:tc:xacml:1.0:rule-combining-algorithm:first-applicable" Version="1.0">
   <Target>
      <AnyOf>
         <AllOf>
            <Match MatchId="urn:oasis:names:tc:xacml:1.0:function:string-equal">
               <AttributeValue DataType="http://www.w3.org/2001/XMLSchema#string">bob</AttributeValue>
               <AttributeDesignator AttributeId="urn:oasis:names:tc:xacml:1.0:subject:subject-id" Category="urn:oasis:names:tc:xacml:1.0:subject-category:access-subject" DataType="http://www.w3.org/2001/XMLSchema#string" MustBePresent="true"></AttributeDesignator>
            </Match>
         </AllOf>
      </AnyOf>
   </Target>
   <Rule Effect="Permit" RuleId="Rule-1">
      <Target>
         <AnyOf>
            <AllOf>
               <Match MatchId="urn:oasis:names:tc:xacml:1.0:function:string-equal">
                  <AttributeValue DataType="http://www.w3.org/2001/XMLSchema#string">FirstName</AttributeValue>
                  <AttributeDesignator AttributeId="urn:oasis:names:tc:xacml:1.0:resource:resource-id" Category="urn:oasis:names:tc:xacml:3.0:attribute-category:resource" DataType="http://www.w3.org/2001/XMLSchema#string" MustBePresent="true"></AttributeDesignator>
               </Match>
            </AllOf>
         </AnyOf>
      </Target>
      <Condition>
         <Apply FunctionId="urn:oasis:names:tc:xacml:1.0:function:string-at-least-one-member-of">
            <Apply FunctionId="urn:oasis:names:tc:xacml:1.0:function:string-bag">
               <AttributeValue DataType="http://www.w3.org/2001/XMLSchema#string">create</AttributeValue>
               <AttributeValue DataType="http://www.w3.org/2001/XMLSchema#string">read</AttributeValue>
               <AttributeValue DataType="http://www.w3.org/2001/XMLSchema#string">update</AttributeValue>
            </Apply>
            <AttributeDesignator AttributeId="urn:oasis:names:tc:xacml:1.0:action:action-id" Category="urn:oasis:names:tc:xacml:3.0:attribute-category:action" DataType="http://www.w3.org/2001/XMLSchema#string" MustBePresent="true"></AttributeDesignator>
         </Apply>
      </Condition>
   </Rule>
   <Rule Effect="Permit" RuleId="Rule-2">
      <Target>
         <AnyOf>
            <AllOf>
               <Match MatchId="urn:oasis:names:tc:xacml:1.0:function:string-equal">
                  <AttributeValue DataType="http://www.w3.org/2001/XMLSchema#string">MiddleName</AttributeValue>
                  <AttributeDesignator AttributeId="urn:oasis:names:tc:xacml:1.0:resource:resource-id" Category="urn:oasis:names:tc:xacml:3.0:attribute-category:resource" DataType="http://www.w3.org/2001/XMLSchema#string" MustBePresent="true"></AttributeDesignator>
               </Match>
            </AllOf>
         </AnyOf>
      </Target>
      <Condition>
         <Apply FunctionId="urn:oasis:names:tc:xacml:1.0:function:string-at-least-one-member-of">
            <Apply FunctionId="urn:oasis:names:tc:xacml:1.0:function:string-bag">
               <AttributeValue DataType="http://www.w3.org/2001/XMLSchema#string">create</AttributeValue>
               <AttributeValue DataType="http://www.w3.org/2001/XMLSchema#string">read</AttributeValue>
            </Apply>
            <AttributeDesignator AttributeId="urn:oasis:names:tc:xacml:1.0:action:action-id" Category="urn:oasis:names:tc:xacml:3.0:attribute-category:action" DataType="http://www.w3.org/2001/XMLSchema#string" MustBePresent="true"></AttributeDesignator>
         </Apply>
      </Condition>
   </Rule>
   <Rule Effect="Permit" RuleId="Rule-3">
      <Target>
         <AnyOf>
            <AllOf>
               <Match MatchId="urn:oasis:names:tc:xacml:1.0:function:string-equal">
                  <AttributeValue DataType="http://www.w3.org/2001/XMLSchema#string">LastName</AttributeValue>
                  <AttributeDesignator AttributeId="urn:oasis:names:tc:xacml:1.0:resource:resource-id" Category="urn:oasis:names:tc:xacml:3.0:attribute-category:resource" DataType="http://www.w3.org/2001/XMLSchema#string" MustBePresent="true"></AttributeDesignator>
               </Match>
            </AllOf>
         </AnyOf>
         <AnyOf>
            <AllOf>
               <Match MatchId="urn:oasis:names:tc:xacml:1.0:function:string-equal">
                  <AttributeValue DataType="http://www.w3.org/2001/XMLSchema#string">read</AttributeValue>
                  <AttributeDesignator AttributeId="urn:oasis:names:tc:xacml:1.0:action:action-id" Category="urn:oasis:names:tc:xacml:3.0:attribute-category:action" DataType="http://www.w3.org/2001/XMLSchema#string" MustBePresent="true"></AttributeDesignator>
               </Match>
            </AllOf>
         </AnyOf>
      </Target>
   </Rule>
   <Rule Effect="Deny" RuleId="Rule-4"></Rule>
</Policy>

Following is the XACML multiple decision profile request that you can try out. Here, you can change the resource value and see the authorization for each resource. It would return permit result for the actions that are permit for "bob"

<Request xmlns="urn:oasis:names:tc:xacml:3.0:core:schema:wd-17" CombinedDecision="false" ReturnPolicyIdList="false">
   <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">LastName</AttributeValue>
      </Attribute>
   </Attributes>
   <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">bob</AttributeValue>
      </Attribute>
   </Attributes>
   <Attributes Category="urn:oasis:names:tc:xacml:3.0:attribute-category:action">
      <Attribute AttributeId="urn:oasis:names:tc:xacml:1.0:action:action-id" IncludeInResult="true">
         <AttributeValue DataType="http://www.w3.org/2001/XMLSchema#string">create</AttributeValue>
      </Attribute>
   </Attributes>
   <Attributes Category="urn:oasis:names:tc:xacml:3.0:attribute-category:action">
      <Attribute AttributeId="urn:oasis:names:tc:xacml:1.0:action:action-id" IncludeInResult="true">
         <AttributeValue DataType="http://www.w3.org/2001/XMLSchema#string">read</AttributeValue>
      </Attribute>
   </Attributes>
   <Attributes Category="urn:oasis:names:tc:xacml:3.0:attribute-category:action">
      <Attribute AttributeId="urn:oasis:names:tc:xacml:1.0:action:action-id" IncludeInResult="true">
         <AttributeValue DataType="http://www.w3.org/2001/XMLSchema#string">update</AttributeValue>
      </Attribute>
   </Attributes>
   <Attributes Category="urn:oasis:names:tc:xacml:3.0:attribute-category:action">
      <Attribute AttributeId="urn:oasis:names:tc:xacml:1.0:action:action-id" IncludeInResult="true">
         <AttributeValue DataType="http://www.w3.org/2001/XMLSchema#string">delete</AttributeValue>
      </Attribute>
   </Attributes>
</Request>
<?xml version="1.0" encoding="UTF-8"?>
<Request xmlns="urn:oasis:names:tc:xacml:3.0:core:schema:wd-17" CombinedDecision="false" ReturnPolicyIdList="false">
   <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">LastName</AttributeValue>
      </Attribute>
   </Attributes>
   <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">bob</AttributeValue>
      </Attribute>
   </Attributes>
   <Attributes Category="urn:oasis:names:tc:xacml:3.0:attribute-category:action">
      <Attribute AttributeId="urn:oasis:names:tc:xacml:1.0:action:action-id" IncludeInResult="true">
         <AttributeValue DataType="http://www.w3.org/2001/XMLSchema#string">create</AttributeValue>
      </Attribute>
   </Attributes>
   <Attributes Category="urn:oasis:names:tc:xacml:3.0:attribute-category:action">
      <Attribute AttributeId="urn:oasis:names:tc:xacml:1.0:action:action-id" IncludeInResult="true">
         <AttributeValue DataType="http://www.w3.org/2001/XMLSchema#string">read</AttributeValue>
      </Attribute>
   </Attributes>
   <Attributes Category="urn:oasis:names:tc:xacml:3.0:attribute-category:action">
      <Attribute AttributeId="urn:oasis:names:tc:xacml:1.0:action:action-id" IncludeInResult="true">
         <AttributeValue DataType="http://www.w3.org/2001/XMLSchema#string">update</AttributeValue>
      </Attribute>
   </Attributes>
   <Attributes Category="urn:oasis:names:tc:xacml:3.0:attribute-category:action">
      <Attribute AttributeId="urn:oasis:names:tc:xacml:1.0:action:action-id" IncludeInResult="true">
         <AttributeValue DataType="http://www.w3.org/2001/XMLSchema#string">delete</AttributeValue>
      </Attribute>
   </Attributes>
</Request>
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