In this post we will cover how to use a JWT issued by a third-party to invoke on an Apache Syncope REST service. The code is available on github here:
- cxf-syncope2-webapp: A pre-configured web application of the Syncope core for use in the tests.
- cxf-syncope2: Some integration tests that use cxf-syncope2-webapp for authentication and authorization purposes. JWTTestIT illustrates third party SSO integration with Syncope as covered in this post.
Naturally, if we invoke on an Apache Syncope REST service using an arbitrary third-party token, access will be denied as Syncope will not be able to validate the signature on the token correctly. By default, Syncope uses the following properties defined in 'security.properties' to both issue and validate signed tokens:
- jwtIssuer: The issuer of the token
- jwsKey: The Hex-encoded (symmetric) verification key
When Syncope receives a signed JWT it will query which of the configured JWTSSOProvider implementations can verify the token, by matching the 'getIssuer()' method to the issuer of the token. The 'getAlgorithm()' method should match the signature algorithm of the received token. The 'verify' method should validate the signature of the received token. The implementation used in the tests is available here. A keystore is read in and the certificate contained in it is used to verify the signature on the received token.
One final interesting point is that we need to map the authenticated JWT subject to a user in Syncope somehow. This is done in the JWTSSOProvider implementation via the 'resolve' method. In our test implementation, we map the JWT subject directly to a Syncope username.
2) Obtain a JWT from the Apache CXF STS using REST
Now that we have set up Apache Syncope to allow third-party JWTs, we need to obtain such a token to get our test-case to work. We will use the Apache CXF Security Token Service (STS) to obtain a JWT. For simplicity we will leverage the REST interface of the CXF STS, which allows us to obtain a token with a simple REST call. The STS is configured via spring to issue signed JWTs. User authentication to the STS is enforced via basic authentication. In the test code, we use the CXF WebClient to invoke on the STS and to get a JWT back:
Now we can use this token with the Syncope client API to call the user "self service" successfully:
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