WSO2 XACML dynamic attribute value

Question

I wanted to write XACML in Wso2 Identity server where i want to authorize user to access country page if user belongs to that country http://localhost:8080/Country_name.

User Country
1   India
2   US
3   UK
4   Australia

And user country mapping is added from UI (of Web application).Now if user 2 logins it should not be able to access other country page other than US

Thanks Priyanka Goel

Answer 1

So you are saying you are trying to get access to a page and that page belongs to a country. You are saying:

• A user can view a page if the user belongs to the same country as the page.

If this is indeed correct, the authorization policy is very simple. Here is what it would look like using ALFA:

 /**
  * Control access to webpage
  */
 policy accessPage{
     target clause action_id == "view" and com.axiomatics.examples.objectType == "page"
     apply firstApplicable
     /**
      * Users can view a page if they are in the same country
      */
     rule allowSameCountry{
         permit
         condition user.country == page.country
     }
 }

In XACML (XML) it looks like the following:

<?xml version="1.0" encoding="UTF-8"?>
 <!--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="http://axiomatics.com/alfa/identifier/so.accessPage"
    RuleCombiningAlgId="urn:oasis:names:tc:xacml:1.0:rule-combining-algorithm:first-applicable"
    Version="1.0">
    <xacml3:Description>Control access to webpage</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">view</xacml3:AttributeValue>
                    <xacml3:AttributeDesignator 
                        AttributeId="urn:oasis:names:tc:xacml:1.0:action:action-id"
                        DataType="http://www.w3.org/2001/XMLSchema#string"
                        Category="urn:oasis:names:tc:xacml:3.0:attribute-category:action"
                        MustBePresent="false"
                    />
                </xacml3:Match>
                <xacml3:Match MatchId="urn:oasis:names:tc:xacml:1.0:function:string-equal">
                    <xacml3:AttributeValue
                        DataType="http://www.w3.org/2001/XMLSchema#string">page</xacml3:AttributeValue>
                    <xacml3:AttributeDesignator 
                        AttributeId="com.axiomatics.examples.objectType"
                        DataType="http://www.w3.org/2001/XMLSchema#string"
                        Category="urn:oasis:names:tc:xacml:3.0:attribute-category:resource"
                        MustBePresent="false"
                    />
                </xacml3:Match>
            </xacml3:AllOf>
        </xacml3:AnyOf>
    </xacml3:Target>
    <xacml3:Rule 
            Effect="Permit"
            RuleId="http://axiomatics.com/alfa/identifier/so.accessPage.allowSameCountry">
        <xacml3:Description>Users can view a page if they are in the same country</xacml3:Description>
        <xacml3:Target />
        <xacml3:Condition>
            <xacml3:Apply FunctionId="urn:oasis:names:tc:xacml:1.0:function:any-of-any">
                <xacml3:Function FunctionId="urn:oasis:names:tc:xacml:1.0:function:string-equal"/>
                <xacml3:AttributeDesignator 
                    AttributeId="com.axiomatics.examples.user.country"
                    DataType="http://www.w3.org/2001/XMLSchema#string"
                    Category="urn:oasis:names:tc:xacml:1.0:subject-category:access-subject"
                    MustBePresent="false"
                />
                <xacml3:AttributeDesignator 
                    AttributeId="com.axiomatics.examples.page.country"
                    DataType="http://www.w3.org/2001/XMLSchema#string"
                    Category="urn:oasis:names:tc:xacml:3.0:attribute-category:resource"
                    MustBePresent="false"
                />
            </xacml3:Apply>
        </xacml3:Condition>
    </xacml3:Rule>
</xacml3:Policy>