1   /*
    2    * Copyright (c) 2003 The Visigoth Software Society. All rights
    3    * reserved.
    4    *
    5    * Redistribution and use in source and binary forms, with or without
    6    * modification, are permitted provided that the following conditions
    7    * are met:
    8    *
    9    * 1. Redistributions of source code must retain the above copyright
   10    *    notice, this list of conditions and the following disclaimer.
   11    *
   12    * 2. Redistributions in binary form must reproduce the above copyright
   13    *    notice, this list of conditions and the following disclaimer in
   14    *    the documentation and/or other materials provided with the
   15    *    distribution.
   16    *
   17    * 3. The end-user documentation included with the redistribution, if
   18    *    any, must include the following acknowledgement:
   19    *       "This product includes software developed by the
   20    *        Visigoth Software Society (http://www.visigoths.org/)."
   21    *    Alternately, this acknowledgement may appear in the software itself,
   22    *    if and wherever such third-party acknowledgements normally appear.
   23    *
   24    * 4. Neither the name "FreeMarker", "Visigoth", nor any of the names of the 
   25    *    project contributors may be used to endorse or promote products derived
   26    *    from this software without prior written permission. For written
   27    *    permission, please contact visigoths@visigoths.org.
   28    *
   29    * 5. Products derived from this software may not be called "FreeMarker" or "Visigoth"
   30    *    nor may "FreeMarker" or "Visigoth" appear in their names
   31    *    without prior written permission of the Visigoth Software Society.
   32    *
   33    * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
   34    * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   35    * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
   36    * DISCLAIMED.  IN NO EVENT SHALL THE VISIGOTH SOFTWARE SOCIETY OR
   37    * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
   38    * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
   39    * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
   40    * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
   41    * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
   42    * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
   43    * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   44    * SUCH DAMAGE.
   45    * ====================================================================
   46    *
   47    * This software consists of voluntary contributions made by many
   48    * individuals on behalf of the Visigoth Software Society. For more
   49    * information on the Visigoth Software Society, please see
   50    * http://www.visigoths.org/
   51    */
   52   
   53   package freemarker.template.utility;
   54   
   55   import java.security.AccessControlException;
   56   import java.security.AccessController;
   57   import java.security.PrivilegedAction;
   58   
   59   import freemarker.log.Logger;
   60   
   61   /**
   62    * @author Attila Szegedi
   63    * @version $Id: SecurityUtilities.java,v 1.2 2004/11/11 13:27:39 szegedia Exp $
   64    */
   65   public class SecurityUtilities
   66   {
   67       private static final Logger logger = Logger.getLogger("freemarker.security");
   68       private SecurityUtilities()
   69       {
   70       }
   71       
   72       public static String getSystemProperty(final String key)
   73       {
   74           return (String) AccessController.doPrivileged(
   75               new PrivilegedAction()
   76               {
   77                   public Object run()
   78                   {
   79                       return System.getProperty(key);
   80                   }
   81               });
   82       }
   83   
   84       public static String getSystemProperty(final String key, final String defValue)
   85       {
   86           try
   87           {
   88               return (String) AccessController.doPrivileged(
   89                   new PrivilegedAction()
   90                   {
   91                       public Object run()
   92                       {
   93                           return System.getProperty(key, defValue);
   94                       }
   95                   });
   96           }
   97           catch(AccessControlException e)
   98           {
   99               logger.warn("Insufficient permissions to read system property '" + 
  100                       key + "', using default value '" + defValue + "'");
  101               return defValue;
  102           }
  103       }
  104   
  105       public static Integer getSystemProperty(final String key, final int defValue)
  106       {
  107           try
  108           {
  109               return (Integer) AccessController.doPrivileged(
  110                   new PrivilegedAction()
  111                   {
  112                       public Object run()
  113                       {
  114                           return Integer.getInteger(key, defValue);
  115                       }
  116                   });
  117           }
  118           catch(AccessControlException e)
  119           {
  120               logger.warn("Insufficient permissions to read system property '" + 
  121                       key + "', using default value " + defValue + "");
  122               return new Integer(defValue);
  123           }
  124       }
  125   }