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package cas.am;

import java.util.Map;
import javax.security.auth.Subject;
import javax.security.auth.callback.Callback;
import javax.security.auth.login.LoginException;
import com.sun.identity.authentication.spi.AMLoginModule;
import com.sun.identity.authentication.spi.AuthLoginException;

import javax.servlet.http.HttpServletRequest;

import edu.yale.its.tp.cas.client.*;

public class CASAMLoginModule extends AMLoginModule {

    private String userTokenId;
    private java.security.Principal userPrincipal = null;

    public CASAMLoginModule() throws LoginException{
	System.out.println("CASAMLoginModule()");
    }

    public void init(Subject subject, Map sharedState, Map options) {
	System.out.println("CASAMLoginModule initialization");
    }

    
  /**
   * Returns a service ID (URL) as a composite of the preconfigured server
   * name and the runtime request.
   */
  private String getService(HttpServletRequest request) throws AuthLoginException{
  
  	String casServerName = request.getServerName()+":"+request.getServerPort();
  	try {
           String service =  Util.getService(request, casServerName);	
           return service;
        } catch (Exception e){
           throw new AuthLoginException("");	
        }	
  }	    

    public int process(Callback[] callbacks, int state) throws AuthLoginException {
	int currentState = state;

        HttpServletRequest request = getHttpServletRequest();

            String urlOfThisService = getService(request);
       

        //TODO remove hardcode of cas urls.
        String casLoginURL = "https://localhost:8443/cas/login";
        String casValidateURL = "https://localhost:8443/cas/serviceValidate";


            String loginFailureURL = casLoginURL + "?service=" + urlOfThisService;
	setLoginFailureURL(loginFailureURL);	
       

        String ticket = request.getParameter("ticket");                     
    

           if(ticket==null) {        	
        	
        	System.out.println("CASAMLoginModule Authentication No Ticket!");
        	throw new AuthLoginException("no ticket found!");    
 	         }	

  
	  String user = null; 
	  String errorCode = null;

	  String errorMessage = null;

         
         
	  /* instantiate a new ServiceTicketValidator */

	  ServiceTicketValidator sv = new ServiceTicketValidator();
 
	  /* set its parameters */ 
	  sv.setCasValidateUrl(casValidateURL); 
	  sv.setService(urlOfThisService); 	
	  sv.setServiceTicket(ticket);  

	  /* contact CAS and validate */ 
	  try{
                sv.validate();
          } catch (Exception e) {            
          	System.out.println("CASAMLoginModule Authentication Validate Fail!"); 	
          	throw new AuthLoginException(e.getMessage());
            	
          }		

	  
	  if(sv.isAuthenticationSuccesful()) {  
	  	user = sv.getUser(); 
	  } else {  
	  	errorCode = sv.getErrorCode();
 
	  	errorMessage = sv.getErrorMessage();
 
	  	/* handle the error */
	  	
	  	System.out.println("CASAMLoginModule Authentication Fail!" + errorMessage);
	  	throw new AuthLoginException(errorMessage);	
 	
	  }


	  
	  /* The user is now authenticated. */  
	  userTokenId = user;	
	  System.out.println("CASAMLoginModule Authentication Pass!");
	
 
	return -1;
    }

    public java.security.Principal getPrincipal() {
        if (userPrincipal != null) {
            return userPrincipal;
        } else if (userTokenId != null) {
            userPrincipal = new CASAMPrincipal(userTokenId);
            return userPrincipal;
        } else {
            return null;
        }
    }
}

package cas.am;

import javax.security.auth.*;
import javax.security.auth.login.*;
import javax.security.auth.callback.*;

import java.security.Principal;


public class CASAMPrincipal implements Principal, java.io.Serializable {

    /**
     * @serial
     */
    private String name;

 


     public CASAMPrincipal(String name) {
	if (name == null)
	    throw new NullPointerException("illegal null input");

	this.name = name;
    }

    /**
     * Return the username for this <code>CASAMPrincipal</code>.
     *
     * <p>
     *
     * @return the username for this <code>CASAMPrincipal</code>
     */
    public String getName() {
	return name;
    }

    /**
     * Return a string representation of this <code>CASAMPrincipal</code>.
     *
     * <p>
     *
     * @return a string representation of this <code>CASAMPrincipal</code>.
     */
    public String toString() {
	return("CASAMPrincipal:  " + name);
    }

    /**
     * Compares the specified Object with this <code>CASAMPrincipal</code>
     * for equality.  Returns true if the given object is also a
     * <code>CASAMPrincipal</code> and the two CASAMPrincipals
     * have the same username.
     *
     * <p>
     *
     * @param o Object to be compared for equality with this
     *		<code>CASAMPrincipal</code>.
     *
     * @return true if the specified Object is equal equal to this
     *		<code>CASAMPrincipal</code>.
     */
    public boolean equals(Object o) {
	if (o == null)
	    return false;

        if (this == o)
            return true;


        if (!(o instanceof CASAMPrincipal))
            return false;
        CASAMPrincipal that = (CASAMPrincipal)o;

	if (this.getName().equals(that.getName()))
	    return true;
	return false;
    }


    /**
     * Return a hash code for this <code>CASAMPrincipal</code>.
     *
     * <p>
     *
     * @return a hash code for this <code>CASAMPrincipal</code>.
     */
    public int hashCode() {
	return name.hashCode();
    }
}

<?xml version='1.0' encoding="UTF-8"?>


<!DOCTYPE ModuleProperties PUBLIC "=//iPlanet//Authentication Module Properties XML Interface 1.0 DTD//EN"
          "jar://com/sun/identity/authentication/Auth_Module_Properties.dtd">

<ModuleProperties moduleName="CAS" version="1.0" >    
</ModuleProperties>