The kerberos support is based SPNEGO as described in http://cxf.apache.org/docs/client-http-transport-including-ssl-support.html#ClientHTTPTransport%28includingSSLsupport%29-SpnegoAuthentication%28Kerberos%29. There two types of kerberos support
Negotiation
With this configuration, REST service is configured with Kerberos JAAS domain, to negotiate a token, then use it access the web service. For this first create a security domain in standalone.xml file as below
<security-domain name="MY_REALM" cache-type="default">
<authentication>
<login-module code="Kerberos" flag="required">
<module-option name="storeKey" value="true"/>
<module-option name="useKeyTab" value="true"/>
<module-option name="keyTab" value="/home/username/service.keytab"/>
<module-option name="principal" value="host/testserver@MY_REALM"/>
<module-option name="doNotPrompt" value="true"/>
<module-option name="debug" value="false"/>
</login-module>
</authentication>
</security-domain>
and the jboss-cxf-xxx.xml file needs to be set as
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:sec="http://cxf.apache.org/configuration/security"
xmlns:http-conf="http://cxf.apache.org/transports/http/configuration"
xsi:schemaLocation="http://cxf.apache.org/transports/http/configuration http://cxf.apache.org/schemas/configuration/http-conf.xsd http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.0.xsd http://cxf.apache.org/configuration/security http://cxf.apache.org/schemas/configuration/security.xsd">
<http-conf:conduit name="*.http-conduit">
<http-conf:authorization>
<sec:AuthorizationType>Negotiate</sec:AuthorizationType>
<sec:Authorization>MY_REALM</sec:Authorization>
</http-conf:authorization>
</http-conf:conduit>
</beans>
The resource adapter creation needs to define the following properties
<config-property name="ConfigFile">path/to/jboss-cxf-xxxx.xml</config-property>
<config-property name="ConfigName">test</config-property>
Even though above configuration configures the value of "ConfigName", the cxf framework currently in the case of JAX-RS client does not give option to use it. For that reason use "*.http-conduit" which will apply to all the HTTP communications under this resource adapter.
Delegation
If in case the user is already logged into Teiid using Kerberos using JDBC/ODBC or used SPNEGO in web-tier and used pass-through authentication into Teiid, then there is no need to negotiate a new token for the Kerberos. The system can delegate the existing token.
To configure for delegation, set up security domain defined exactly as defined in "negotiation", and jboss-cxf-xxx.xml file, however remove the following line from jboss-cxf-xxx.xml file, as it is not going to negotiate new token.
<sec:Authorization>MY_REALM</sec:Authorization>
Add the following properties in web service resource adapter creation. One configures that "kerberos" security being used, the second defines a security domain to be used at the data source, in this case we want to use a security domain that passes through a logged in user
<config-property name="SecurityType">Kerberos</config-property>
<security>
<security-domain>passthrough-security</security-domain>
</security>
To configure in "passthrough-security" security domain, the "security" subsystem add following XML fragment
<security-domain name="passthrough-security" cache-type="default">
<authentication>
<login-module code="org.teiid.jboss.PassthroughIdentityLoginModule" flag="required" module="org.jboss.teiid">
<module-option name="username" value="guest"/>
<module-option name="password" value="guest"/>
</login-module>
</authentication>
</security-domain>
The username, password are optional, if in case there is no authenticated subject available in the context, these can help create a simple static user, but that user will not work with kerberos authentication as the subject will not have the kerberos token required.