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Wednesday, November 10, 2010

Guide to write XACML policies in WSO2 Identity Server - Part - 4

This blog post is a follow up to the Guide to write XACML policies in WSO2 Identity Server - Part - 3.

This post addresses following authorization requirements.

1. The operation getEmployees in the service http://localhost:8280/services/Customers should only be accessed by the users belong to both the groups admin_emps and admin

2. If the user belongs to more groups than admin_emps and admin - request should fail

3. Request to any other service or operation should fail
<?xml version="1.0" encoding="UTF-8"?>
<Policy PolicyId="urn:sample:xacml:2.0:samplepolicy"
  RuleCombiningAlgId="urn:oasis:names:tc:xacml:1.0:rule-combining-algorithm:first-applicable" xmlns="urn:oasis:names:tc:xacml:2.0:policy:schema:os">
  <Description>Sample XACML Authorization Policy</Description>
  <Target>
    <Subjects>
      <AnySubject/>
    </Subjects>
    <Actions>
      <AnyAction/>
    </Actions>
    <Resources>
      <AnyResource/>
    </Resources>
  </Target>
  <Rule Effect="Permit" RuleId="primary-group-emps-rule">
    <Target>
      <Subjects>
        <AnySubject/>
      </Subjects>
      <Resources>
        <Resource>
          <ResourceMatch MatchId="urn:oasis:names:tc:xacml:1.0:function:string-regexp-match">
            <AttributeValue DataType="http://www.w3.org/2001/XMLSchema#string">http://localhost:8280/services/Customers/getEmployees</AttributeValue>
            <ResourceAttributeDesignator
              AttributeId="urn:oasis:names:tc:xacml:1.0:resource:resource-id" DataType="http://www.w3.org/2001/XMLSchema#string"/>
          </ResourceMatch>
        </Resource>
      </Resources>
      <Actions>
        <Action>
          <ActionMatch MatchId="urn:oasis:names:tc:xacml:1.0:function:string-equal">
            <AttributeValue DataType="http://www.w3.org/2001/XMLSchema#string">read</AttributeValue>
            <ActionAttributeDesignator
              AttributeId="urn:oasis:names:tc:xacml:1.0:action:action-id" DataType="http://www.w3.org/2001/XMLSchema#string"/>
          </ActionMatch>
        </Action>
      </Actions>
    </Target>
    <Condition>
      <Apply FunctionId="urn:oasis:names:tc:xacml:1.0:function:string-set-equals">
        <SubjectAttributeDesignator AttributeId="group" DataType="http://www.w3.org/2001/XMLSchema#string"/>
        <Apply FunctionId="urn:oasis:names:tc:xacml:1.0:function:string-bag">
          <AttributeValue DataType="http://www.w3.org/2001/XMLSchema#string">admin_emps</AttributeValue>
          <AttributeValue DataType="http://www.w3.org/2001/XMLSchema#string">admin</AttributeValue>
        </Apply>
      </Apply>
    </Condition>
  </Rule>
  <Rule Effect="Deny" RuleId="deny-rule"/>
</Policy>

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