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  1. Let’s start by creating the required users. First, you need to link both the API Manager and the Identity Server to the same user store. This can be done by linking the API manager with the LDAP user store within WSO2 Identity Server. For more information, see Configuring Primary User Stores.

    Tip

    In an actual deployment, both these servers can be linked to the user store of your organization.

  2. Start the WSO2 API Manager server and log in to the Management Console. Create user information with the following permission structure.

    User

    Role

    api_user

    webuser

    api_admin

    admin

  3. Start the WSO2 Identity Server and log in to its Admin Console. 

    Tip

    Since API Manager and Identity Server run on the same server, offset the Identity Server by 1.

  4. Under the Entitlement section, click Policy Administration > Add New Entitlement Policy.

     
  5. You are redirected to a page listing all available policy editors. Select Standard Policy Editor from the list and add the values shown below in the policy editor.
    1. Entitlement Policy Name: PizzaShackPolicy
    2. Rule Combining Algorithm: Deny unless Permit
    When the rule combination algorithm is set to Deny Unless Permit, you need to set the permit criteria as a rule. 
  6. In the Define Entitlement Rule(s) area, set the following 3 rules to define the kind of requests and from which user they should be permitted.
    1. AdminGrant - grants full access to the admin user. Give the information below,
      Rule Name: AdminGrant
      Conditions: Subject is/are at-least-one-member admin
      Click the icon next to END shown below to configure the attribute value and attribute source to retrieve the user roles from the user store. 
      Select the attributes as given below. Note that this needs to be done for all the rules.
      Select Attribute ID: Role
      Select Attribute Data Type: String
      Entitlement Data Module: Carbon Attribute Finder Module
    2. GetOrder- allows web users to get order information from the API. Give the information below,
      Rule Name: GetOrder
      Conditions: Action is equal GET
      Subject is/are at-least-one-member webuser
      Click the icon next to END shown below to configure the attribute value and attribute source to retrieve the user roles from the user store. 

  7. Click Add once done.
  8.  The rules are added to the policy. Click Finish to save the policy. 
  9. In the Policy Administration page, click Publish to My PDP to publish the policy to the PDP. You can test the service by clicking Try.
  10. Add the entitlement-1.0-SNAPSHOT JAR file to the <APIM_HOME>/repository/components/lib directory. This JAR file contains the APIEntitlementCallbackHandler class which passes the username, HTTP verb and the resource path to the XACML entitlement server.
    If you want to view the source code of the JAR, go here.
  11. Restart the server once the JAR file is added.
  12. Now, you need to create a sequence containing the entitlement policy mediator that can be attached to each API required to authorize users with the entitlement server. Create an XML file with the following configuration and name it EntitlementMediator.xml. 

    Code Block
    languagexml
    <sequence xmlns="http://ws.apache.org/ns/synapse"  name="EntitlementMediator">      
        <entitlementService xmlns="http://ws.apache.org/ns/synapse" remoteServiceUrl="https://localhost:9444/services" remoteServiceUserName="admin" remoteServicePassword="admin" callbackClass="org.wso2.sample.handlers.entitlement.APIEntitlementCallbackHandler"/>
    </sequence>
    Info

    The attribtes in the <entitlementService> element above should be modified according to the services endpoint configuration as follows. 

    remoteServiceUrl - Service url of WSO2 Identity Server, acting as the XACML entitlement server in this scenario.
    remoteServiceUserName - Username
    remoteServicePassword - Password used to connect to the service
  13. Log in to the API Publisher and create an API.
  14. Attach the custom sequence to the inflow of the message as shown below.
  15. Save, publish and test the API to make sure that the requests specified in the 2 rules defined in step 8 are accessible according to the user role specified. For example, the POST operation is only available to users with the role admin. If an anonymous user tries to access the POST operation, it should fail.

    Note

    If you encounter an error stating "org.apache.axis2.transport.jms.JMSSender cannot be found by axis2_1.6.1.wso2v16" when publishing the API, comment out the following JMSSender configuration in the <APIM_HOME>/repository/conf/axis2/axis2_blocking_client.xml file and restart the server.

    <!--transportSender name="jms" class="org.apache.axis2.transport.jms.JMSSender"/-->

  16. If you want to debug the entitlement mediator, enable debug logs in the Management Console for the org.wso2.sample.handlers.entitlement.APIEntitlementCallbackHandler class.