Package org.apache.xerces.parsers

Source Code of org.apache.xerces.parsers.SecurityConfiguration

/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements.  See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License.  You may obtain a copy of the License at
*
*      http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/

package org.apache.xerces.parsers;

import org.apache.xerces.impl.Constants;
import org.apache.xerces.util.SecurityManager;
import org.apache.xerces.util.SymbolTable;
import org.apache.xerces.xni.grammars.XMLGrammarPool;
import org.apache.xerces.xni.parser.XMLComponentManager;

/**
* This configuration allows Xerces to behave in a security-conscious manner; that is,
* it permits applications to instruct Xerces to limit certain
* operations that could be exploited by malicious document authors to cause a denail-of-service
* attack when the document is parsed.
*
* In addition to the features and properties recognized by the base
* parser configuration, this class recognizes these additional
* features and properties:
* <ul>
* <li>Properties
<ul>
*   <li>http://apache.org/xml/properties/security-manager</li>
</ul>
* </ul>
*
* @author Neil Graham, IBM
*
* @version $Id: SecurityConfiguration.java 699892 2008-09-28 21:08:27Z mrglavas $
*/
public class SecurityConfiguration extends XIncludeAwareParserConfiguration
{

    //
    // Constants
    //

    protected static final String SECURITY_MANAGER_PROPERTY =
        Constants.XERCES_PROPERTY_PREFIX + Constants.SECURITY_MANAGER_PROPERTY;

    //
    // Constructors
    //

    /** Default constructor. */
    public SecurityConfiguration () {
        this(null, null, null);
    } // <init>()

    /**
     * Constructs a parser configuration using the specified symbol table.
     *
     * @param symbolTable The symbol table to use.
     */
    public SecurityConfiguration (SymbolTable symbolTable) {
        this(symbolTable, null, null);
    } // <init>(SymbolTable)

    /**
     * Constructs a parser configuration using the specified symbol table and
     * grammar pool.
     * <p>
     * <strong>REVISIT:</strong>
     * Grammar pool will be updated when the new validation engine is
     * implemented.
     *
     * @param symbolTable The symbol table to use.
     * @param grammarPool The grammar pool to use.
     */
    public SecurityConfiguration (SymbolTable symbolTable,
                                         XMLGrammarPool grammarPool) {
        this(symbolTable, grammarPool, null);
    } // <init>(SymbolTable,XMLGrammarPool)

    /**
     * Constructs a parser configuration using the specified symbol table,
     * grammar pool, and parent settings.
     * <p>
     * <strong>REVISIT:</strong>
     * Grammar pool will be updated when the new validation engine is
     * implemented.
     *
     * @param symbolTable    The symbol table to use.
     * @param grammarPool    The grammar pool to use.
     * @param parentSettings The parent settings.
     */
    public SecurityConfiguration (SymbolTable symbolTable,
                                         XMLGrammarPool grammarPool,
                                         XMLComponentManager parentSettings) {
        super(symbolTable, grammarPool, parentSettings);
       
        // create the SecurityManager property:
        setProperty(SECURITY_MANAGER_PROPERTY, new SecurityManager());
    } // <init>(SymbolTable,XMLGrammarPool)

} // class SecurityConfiguration

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