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PicketBox is a security project for Java Applications.

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/*
* JBoss, Home of Professional Open Source
* Copyright 2005, JBoss Inc., and individual contributors as indicated
* by the @authors tag. See the copyright.txt in the distribution for a
* full listing of individual contributors.
*
* This is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This software is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this software; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
*/
package org.jboss.security.auth.certs;

import java.security.Principal;
import java.security.cert.X509Certificate;

import org.jboss.security.CertificatePrincipal;
import org.jboss.security.SimplePrincipal;

/** A CertificatePrincipal implementation that uses the client cert
 * SubjectDN CN='...' element as the principal.
 * 
 * @author [email protected]
 * @version $Revision$
 */
public class SubjectCNMapping
   implements CertificatePrincipal
{
   /** Returns the client cert common name portion (cn=...) of the SubjectDN
    * as the principal.
    *
    * @param certs Array of client certificates, with the first one in
    * the array being the certificate of the client itself.
    */
   public Principal toPrincipal(X509Certificate[] certs)
   {
      Principal cn = null;
      Principal subject = certs[0].getSubjectDN();
      // Look for a cn=... entry in the subject DN
      String dn = subject.getName().toLowerCase();
      int index = dn.indexOf("cn=");
      if( index >= 0 )
      {
         int comma = dn.indexOf(',', index);
         if( comma < 0 )
            comma = dn.length();
         String name = dn.substring(index+3, comma);
         cn = new SimplePrincipal(name);
      }
      else
      {
         // Fallback to the DN
         cn = subject;
      }
      return cn;
   }
   
   public Principal toPrinicipal(X509Certificate[] certs)
   {
      return toPrincipal(certs);
   }
}