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Francois Lascelles

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Top Stories by Francois Lascelles

SOA Best Practices Digest Although certain RESTful web services are of a ‘public’ nature and do not have specific security requirements such as authentication and authorization, any service that has an entry point from an untrusted network is subject to attack and proper threat protection measures are always an essential consideration. RESTful web services are closely aligned to the web itself and as such inherit all traditional threats from the web. Although network level threats are well understood and addressed by traditional firewall infrastructure, RESTful web services type APIs are also subject to content (or message) level threats. For example, consider APIs where XML payloads are POSTed and/or PUT from external requesters. A particularly dangerous threat was uncovered last summer involving a vulnerability in most XML parsing libraries used at the time. An... (more)

How Cloud, Mobile & APIs Change the Way We Broker Identity

The adoption of cloud by organizations looking for more efficient ways to deploy their own IT assets or as a means to offset the burden of data management drives the need for identity federation in the enterprise. Compounding this is the mobile effect from which there is no turning back. Data must be available any time, from anywhere and the identities accessing it must be asserted on mobile devices, in cloud zones, always under the stewardship of the enterprise. APIs serve federation by enabling lightweight delegated authentication schemes based on OAuth handshakes using the sa... (more)

Flexible Identity Federation XML Gateways to The Rescue

Imagine a fresh business relationship between ACME Corporation and Partner. As a result of this relationship, ACME wants to grant Partner limited access to one of its core internal applications. They do this, naturally, by exposing a Web service. Why Identity Federation? Boris (an employee at Partner) sends a SOAP request to the ACME Web service along with some password or proof-of-possession type credentials. Because Boris's identity is managed outside of ACME, those credentials cannot be authenticated using ACME's authentication infrastructure. To circumvent this issue, one cou... (more)

JSON Schema Validation for RESTful Web Services

In the article "The importance of threat protection for restful web services", I presented a number of content-based threats for XML. When protecting an endpoint from XML based attacks, not only are payloads scanned for code injections, malicious entity declarations and parser attacks, XML documents are actually validated against strict schemas that clearly describe expected document structures. Enforcing this type of compliance at the edge, in a SOA gateway for example, minimizes the risk of attacks of the Web service endpoint. Structure definition languages such as XML Schema ... (more)

API Management – Infrastructure vs SaaS

The Enterprise is buzzing with API initiatives these days. APIs not only serve mobile applications, they are increasingly redefining how the enterprise does B2B and integration in general. API management as a category follows different models. On one hand, certain technology vendors offer specialized infrastructure to handle the many aspects of API management. On the other, an increasing number of SaaS vendors offer a service which you subscribe to, providing a pre-installed, hosted, basic API management system. Hybrid models are emerging, but that’s a topic for a future post. B... (more)