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An answer to your common XACML dilemmas Asela Pathberiya Senior Software Engineer
WSO2 Founded in 2005 by acknowledged leaders in XML, Web Services Technologies & Standards and Open Source Producing entire middleware platform 100% open source under Apache license Business model is to sell comprehensive support & maintenance for our products Venture funded by Intel Capital and Quest Software. Global corporation with offices in USA, UK & Sri Lanka 150+ employees and growing
What are we going to cover What is XACML? Why is XACML important for your organization? What are the disadvantages of XACML? How can WSO2 Identity Server help you to overcome those disadvantages?
ETag GroupETag group is a trading company, which is established in 2001.
Application SystemETag group deployed their 1st Application System in 2005.
AuthenticationApplication System included an authentication mechanism
AuthenticationSome functions and data in the Application System must not be accessed by all employees in the company.Therefore authentication is not enough..!!!
AuthorizationETag group wanted to build an authorization logic for their Application System.
Role Based Access Control (RBAC)Set of people who has same set of privileges, putin to a role and assign permission for that role.
Growth of ETag GroupEffect of company growth No. of Application Systems were increased. For each application system, authorization logics were needed to implemented. Authorization logics became more complex Authorization logics were needed to be updated frequently Maintaining of authorization logics became a tricky task
MeetingDecided implement a new authorization system
ETag Common Authorization System (ECAS) Denis was asked to lead “ECAS” project “ECAS” project must fulfill following six requirements as decided in the board meeting.
ExternalizedAuthorization system is not bound to an application. Eachapplication must be able to query a single authorizationsystem for all authorization queries
Policy basedAuthorization logics can be modified frequently without any source code changes.
StandardizedEven business managers and external people must be aware of the technology which is used to design this.
Attribute Based"X resource can be accessed by the Users who are from etag.com domain and whose age is not less than 18 years old”
Fine-grainedNeed to achieve the fine grain without defining a large number of static combinations in the source code or database
Real Time “Can user, Bob transfer X amount from current account Y between 9.00am to 4.00pm”
XACMLXACML is standard for eXtensible Access Control Markup Language
Standard which is ratified by OASIS standards organizationThe first meeting 21st March 2001XACML 1.0 - OASIS Standard – 6 February 2003XACML 1.1 – Committee Specification – 7th August 2003XACML 2.0 – OASIS Standard – 1 February 2005XACML 3.0 – OASIS Standard – 10th Aug 2010
XACML Implementation for ECAS Denis was really happy as he found the solution for all requirements Denis thought to start to implement XACML based authorization system for ECAS project
Meeting “Denis, It is hard to implement a XACML solution from the scratch”“It is better to find an existing implementation and plug it in to ECAS project “
Meeting“We need a closer look on XACML... Let have areview on it”
Disadvantages Performances of XACML based authorization system would be less than the existing system Complexity of defining and managing XACML policies How to integrate current authorization logics in to new system as XACML policies. How to provide a standard interface to communicate with with PDP. PDP would be able to handle lager number of (10000 -100000) policies How to achieve reliability and High availability. Can XACML solutions support "What are the resources that Bob can access?"
An Open source XACML Implementation"Open source XACML solution, WSO2 identity Server, Just download and can run the PDP with out any configuration. how fast is that..? I do not want to write mail asking for evaluation copies" "I can just write simple XACML policy and try this out... Nice web based UI. "
Performance bottleneck There would be less performance than the traditional authorization systems. It is a trade-off for the advantages, offered But WSO2 Identity Server team has identify this performance bottleneck and has provided a solution to overcome this to a greater extent. Caching technologies Thrift protocol for PDP – PEP communication
Load Test Figures EnvironmentIntel(R) Xeon(R) CPU X3440 @ 2.53GHz processor, 4 GB RAM, OS - Debian 6.0 (64bit) - with a single instance of Identity Server [-Xms1024m -Xmx2024m -XX:MaxPermSize=1024m] Policy ComplexityL1: 10 rules per policy while one rule dealing with 1 attributeL2: 100 rules per policy while one rule dealing with more than 10 attributes Requestsone million XACML requests.XACML requests are randomly retrieved from a pool where 10 000 different requests are available Resourceshttp://people.wso2.com/~asela/xacml_load_test/
What we discussed Today Identified XACML as a standard way of implementing authorization How XACML answers the authorization requirements of your organization What are the negative points of XACML How WSO2 Identity Server has provided an answer for them