Wednesday, June 27, 2018

Securing web services using Talend's Open Studio for ESB - part VII

This is the seventh and final article in a series on securing web services using Talend's Open Studio for ESB. First we covered how to create and secure a SOAP service, client job and route in the Studio, and how to deploy them to the Talend runtime container. In the previous post we looked instead at how to implement a REST service and client in the Studio. In this post we will build on the previous post by showing some different ways to secure our REST service when it is deployed in the Talend container.

1) Secure the REST "double-it" webservice using HTTP B/A

Previously we saw how to secure the SOAP "double-it" service in the container using WS-Security UsernameTokens. In this section we'll also secure our REST service using a username and password that the client supplies - this time using HTTP Basic Authentication. Open the REST service we have created in the Studio, and click on the 'tRESTRequest' component. Select "Use Authentication" and then pick the default "Basic HTTP" option. Save the job and build it by right clicking on the job name and selecting "Build job".

Start the runtime container and deploy the job. Now open our REST client job in the Studio. Click on the 'tRESTClient' component and select "Use Authentication" as per 'tRESTRequest' above. Select 'tesb' for the username and password (see section 2 of the SAML tutorial for an explanation of how authentication works in the container). Now build the job and deploy it to the container. The client job should successfully run. See below for a log of a successful request where the client credentials can be seen in the "Basic" HTTP header:

2) Secure the REST "double-it" webservice using SAML

As for SOAP services, we can also secure our REST webservice using SAML. Instead of having the REST client to create a SAML Assertion, we will leverage the Talend Security Token Service (STS). The REST client will use the same mechanism (WS-Trust) to authenticate and obtain a SAML Token from the Talend STS as for the SOAP-case. Then the REST client inserts the SAML Token into the authorization header of the service request. The service parses the header and validates the signature on the SAML Token in exactly the same way as for the REST request.

In the Studio, edit the 'tRESTRequest' and 'tRESTClient' components in our jobs as for the "Basic Authentication" example above, except this time select "SAML Token" for "Use Authentication". Save the jobs and build them and deploy the service to the container. Before deploying the client job, we need to start the STS via:
  • tesb:start-sts
Then deploy the client job and it should work correctly:

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