/*
* Copyright (c) 2005-2010, WSO2 Inc. (http://www.wso2.org) All Rights Reserved.
*
* WSO2 Inc. 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.wso2.carbon.proxyadmin.ui.client;
import org.apache.xerces.impl.Constants;
import org.apache.xerces.util.SecurityManager;
import org.xml.sax.EntityResolver;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;
import javax.xml.XMLConstants;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import java.io.IOException;
import java.util.Arrays;
public class ProxyAdminClientUtils {
/**
* Sorts the given array alphabetically. This method does not sort in-place. Therefore
* the original array is always unaffected. Returned array is a sorted copy.
*
* @param names An array of Strings
* @return a sorted array
*/
public static String[] sortNames(String[] names) {
if (names == null || names.length == 0 || names[0] == null) {
return names;
}
String[] copy = new String[names.length];
System.arraycopy(names, 0, copy, 0, names.length);
Arrays.sort(copy);
return copy;
}
/**
* This method provides a secured document builder which will secure XXE attacks.
*
* @param setIgnoreComments whether to set setIgnoringComments in DocumentBuilderFactory.
* @return DocumentBuilder
* @throws javax.xml.parsers.ParserConfigurationException
*/
public static DocumentBuilder getSecuredDocumentBuilder(boolean setIgnoreComments) throws
ParserConfigurationException {
DocumentBuilderFactory documentBuilderFactory = DocumentBuilderFactory.newInstance();
documentBuilderFactory.setIgnoringComments(setIgnoreComments);
documentBuilderFactory.setNamespaceAware(true);
documentBuilderFactory.setExpandEntityReferences(false);
documentBuilderFactory.setFeature(XMLConstants.FEATURE_SECURE_PROCESSING, true);
documentBuilderFactory.setXIncludeAware(false);
SecurityManager securityManager = new SecurityManager();
securityManager.setEntityExpansionLimit(0);
documentBuilderFactory.setAttribute(Constants.XERCES_PROPERTY_PREFIX +
Constants.SECURITY_MANAGER_PROPERTY, securityManager);
DocumentBuilder documentBuilder = documentBuilderFactory.newDocumentBuilder();
documentBuilder.setEntityResolver(new EntityResolver() {
@Override
public InputSource resolveEntity(String publicId, String systemId) throws SAXException, IOException {
throw new SAXException("Possible XML External Entity (XXE) attack. Skipping entity resolving");
}
});
return documentBuilder;
}
}