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/*
 * Copyright (c) 1997, 2018 Oracle and/or its affiliates. All rights reserved.
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Distribution License v. 1.0, which is available at
 * http://www.eclipse.org/org/documents/edl-v10.php.
 *
 * SPDX-License-Identifier: BSD-3-Clause
 */

/*
 * DefaultRealmAuthenticationProvider.java
 *
 * Created on November 12, 2006, 10:22 AM
 *
 * To change this template, choose Tools | Template Manager
 * and open the template in the editor.
 */

package com.sun.xml.wss.impl.misc;


import com.sun.xml.wss.RealmAuthenticationAdapter;
import com.sun.xml.wss.WSITXMLFactory;
import com.sun.xml.wss.XWSSecurityException;
import com.sun.xml.wss.impl.MessageConstants;
import java.io.File;
import java.io.IOException;
import java.security.AccessController;
import java.security.Principal;
import java.security.PrivilegedAction;
import java.util.HashMap;
import javax.security.auth.Subject;
import javax.security.auth.callback.Callback;
import javax.security.auth.callback.CallbackHandler;
import javax.security.auth.message.callback.CallerPrincipalCallback;
import javax.security.auth.message.callback.PasswordValidationCallback;
import javax.security.auth.x500.X500Principal;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import org.w3c.dom.Document;
import org.w3c.dom.NamedNodeMap;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.xml.sax.SAXException;

/**
 *
 * @author kumar jayanti
 */
public class DefaultRealmAuthenticationAdapter extends RealmAuthenticationAdapter {
    
    private CallbackHandler gfCallbackHandler = null;
    private HashMap tomcatUsersXML = null;
    
    private static DocumentBuilderFactory dbf = WSITXMLFactory.createDocumentBuilderFactory(WSITXMLFactory.DISABLE_SECURE_PROCESSING);
    
    private static String classname = "com.sun.enterprise.security.jmac.callback.ContainerCallbackHandler";
 
    /*
    static {
        dbf.setNamespaceAware(true);
    }*/
    
    /** Creates a new instance of DefaultRealmAuthenticationProvider */
    public DefaultRealmAuthenticationAdapter() {
        if (isGlassfish()) {
            gfCallbackHandler = this.loadGFHandler();
        } else if (isTomcat()) {
            populateTomcatUsersXML();     
        }
    }
    
    private boolean isGlassfish() {
        String val = System.getProperty("com.sun.aas.installRoot");
        if (val != null) {
            return true;
        }
        return false;
    }
    private boolean isTomcat() {
        String val = System.getProperty("catalina.home");
        String val1 = System.getProperty("com.sun.aas.installRoot");
        if ((val1 == null) && (val != null)) {
            return true;
        }
        return false;
    }
    
    private boolean authenticateFromTomcatUsersXML(
            final Subject callerSubject, final String username, final String password) 
            throws XWSSecurityException {
        if (tomcatUsersXML != null) {
            String pass = (String)tomcatUsersXML.get(username);
            if (pass == null) {
                return false;
            }
            if (pass.equals(password)) {
                //populate the subject
                AccessController.doPrivileged(new PrivilegedAction() {
                    
                    public Object run() {
                        String x500Name = "CN=" + username;
                        Principal principal = new X500Principal(x500Name);
                        callerSubject.getPrincipals().add(principal);
//                        if (password != null) {
//                            callerSubject.getPrivateCredentials().add(password);
//                        }
                        return null; // nothing to return
                    }
                });
                return true;
            }else {
                return false;
            }
            
        } else {
            throw new XWSSecurityException(
                    "Internal Error: Username Authentication Failed: Could not Load/Locate tomcat-users.xml, Possible Cause is Application is Not Running on TOMCAT ?");       
        }
    }
    
    private boolean authenticateWithGFCBH(Subject callerSubject, String username, String password)throws XWSSecurityException {
        if (gfCallbackHandler != null) {
            char[] pwd = (password == null) ? null : password.toCharArray(); 
            PasswordValidationCallback pvCallback = 
                    new PasswordValidationCallback(callerSubject,username, pwd);
            Callback[] callbacks = new Callback[] { pvCallback };
            try {
               gfCallbackHandler.handle(callbacks);
            } catch (Exception e) {
               throw new XWSSecurityException(e);
            }

           // zero the password 
           if (pwd != null)
              pvCallback.clearPassword();

           boolean result = pvCallback.getResult();
           if (result) {
               //invoke the CallerPrincipalCallback
               CallerPrincipalCallback pCallback = new CallerPrincipalCallback(callerSubject, username);
               callbacks = new Callback[] { pCallback };
               try {
                   gfCallbackHandler.handle(callbacks);
               } catch (Exception e) {
                   throw new XWSSecurityException(e);
               }
               return result;
           } else {
               return result;
           }
        } else {
            throw new XWSSecurityException(
                    "Internal Error: Username Authentication Failed: Could not Locate/Load CallbackHandler: " + classname);       
        }
    }
    
    @Override
    public boolean authenticate(Subject callerSubject, String username, String password) throws XWSSecurityException {
        if (isGlassfish())  {
            return authenticateWithGFCBH(callerSubject, username, password);
            
        } else if (isTomcat()) {
            return authenticateFromTomcatUsersXML(callerSubject, username, password);
        }  else  {
            throw new XWSSecurityException("Error: Could not locate default username validator for the container");
        }
    }
    
    @Override
     public boolean authenticate(Subject callerSubject,  String username, String passwordDigest, String nonce, String created) throws XWSSecurityException {
        // this is the place from where i can go to GF JDBC Realm
         throw new XWSSecurityException("Not Yet Supported: Digest Authentication not yet supported in  DefaultRealmAuthenticationAdapter");
     }
       
    protected CallbackHandler loadGFHandler() {
        
        Class ret = null;
        try {
            
            ClassLoader loader = Thread.currentThread().getContextClassLoader();
            try {
                if (loader != null) {
                    ret = loader.loadClass(classname);
                }
            }catch(ClassNotFoundException e) {
              //  throw new RuntimeException(e);
            }
            
            if (ret == null) {
                // if context classloader didnt work, try this
                loader = this.getClass().getClassLoader();
                ret = loader.loadClass(classname);
            }
            
            if (ret != null) {
                CallbackHandler handler = (CallbackHandler)ret.newInstance();
                return handler;
            }
        } catch (ClassNotFoundException e) {
            // ignore
            //throw new RuntimeException(e);
            
        } catch(InstantiationException e) {
            //throw new RuntimeException(e);
        } catch(IllegalAccessException ex) {
            //throw new RuntimeException(ex);
        }
        //throw new RuntimeException("Internal Error: Could Not Load CallbackHandler Class: " + classname);
        return null;
    }

    private void populateTomcatUsersXML() {
        String catalinaHome = System.getProperty("catalina.home");
       
        String tomcat_user_xml = 
                catalinaHome + File.separator + "conf" + File.separator + "tomcat-users.xml";
       
        try {
            File tomcatUserXML = new File(tomcat_user_xml);
            if (!tomcatUserXML.exists()) {
                // this may not be a TOMCAT system although catalina.home is set.
                //TODO Issue a FINE LOG here
                return;
            }
            DocumentBuilder builder = dbf.newDocumentBuilder();
            Document doc = builder.parse(tomcatUserXML);
            NodeList nl = doc.getElementsByTagName("user");
            tomcatUsersXML = new HashMap();
            
            for (int i=0; i
            
    

            



    
    






    
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