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POPorting WebSphere code to get remote credentials to Tomcat
 

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  1. POPorting WebSphere code to get remote credentials to Tomcat
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    <p>I have been asked to look into porting some code from a web app under IBM WAS 7 so that it will run under Tomcat 7.</p> <p>This is part of a larger SPNEGO/Kerberos SSO system but for purposes of discussion I have distilled the code down to the following that shows the dependencies on the two WebSphere classes AccessController and WSSubject:</p> <pre><code>GSSCredential clientCreds = (GSSCredential) com.ibm.ws.security.util.AccessController.doPrivileged(new java.security.PrivilegedAction() { public Object run() { javax.security.auth.Subject subject = com.ibm.websphere.security.auth.WSSubject.getCallerSubject(); GSSCredential clientCreds = (GSSCredential) subject.getPrivateCredentials(GSSCredential.class).iterator().next(); return clientCreds; } }); </code></pre> <p>I'd like to be able to do this in Tomcat.</p> <p>[edit] I think the distilled code above perhaps doesn't explain clearly what is needed. I don't need to configure Tomcat to control access to the web app, nor do I need to impersonate the remote user. What I actually need is the unencrypted Kerberos ticket so that I can pass it to another process that will complete the authentication. Here is a more complete snippet:</p> <pre><code>com.ibm.ws.security.util.AccessController.doPrivileged(new java.security.PrivilegedAction() { public Object run() { Oid krb5Mechanism = new Oid("1.2.840.113554.1.2.2"); Oid krb5PrincipalNameType = new Oid("1.2.840.113554.1.2.2.1"); GSSManager manager = GSSManager.getInstance(); GSSName serverName = manager.createName("HOST/my.host.org", krb5PrincipalNameType); javax.security.auth.Subject subject = com.ibm.websphere.security.auth.WSSubject.getCallerSubject(); GSSCredential clientCreds = (GSSCredential) subject.getPrivateCredentials(GSSCredential.class).iterator().next(); GSSContext secContext = manager.createContext(serverName, krb5Mechanism, clientCreds, GSSContext.DEFAULT_LIFETIME); // After this the Kerberos ticket is extracted from secContext, converted to a String and passed to the other process for authentication } }); </code></pre>
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