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Apache XML Security for Java supports XML-Signature Syntax and Processing, W3C Recommendation 12 February 2002, and XML Encryption Syntax and Processing, W3C Recommendation 10 December 2002. As of version 1.4, the library supports the standard Java API JSR-105: XML Digital Signature APIs.
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/**
 * 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.xml.security.stax.ext;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.apache.xml.security.stax.impl.DocumentContextImpl;
import org.apache.xml.security.stax.impl.InputProcessorChainImpl;
import org.apache.xml.security.stax.impl.InboundSecurityContextImpl;
import org.apache.xml.security.stax.impl.XMLSecurityStreamReader;
import org.apache.xml.security.stax.impl.processor.input.LogInputProcessor;
import org.apache.xml.security.stax.impl.processor.input.XMLEventReaderInputProcessor;
import org.apache.xml.security.stax.impl.processor.input.XMLSecurityInputProcessor;
import org.apache.xml.security.stax.securityEvent.SecurityEvent;
import org.apache.xml.security.stax.securityEvent.SecurityEventListener;

import javax.xml.stream.Location;
import javax.xml.stream.XMLInputFactory;
import javax.xml.stream.XMLStreamException;
import javax.xml.stream.XMLStreamReader;

import java.util.Collections;
import java.util.Iterator;
import java.util.List;

/**
 * Inbound Streaming-XML-Security
 * An instance of this class can be retrieved over the XMLSec class
 *
 * @author $Author: coheigea $
 * @version $Revision: 1354898 $ $Date: 2012-06-28 11:19:02 +0100 (Thu, 28 Jun 2012) $
 */
public class InboundXMLSec {

    protected static final transient Logger log = LoggerFactory.getLogger(InboundXMLSec.class);

    private static final XMLInputFactory xmlInputFactory = XMLInputFactory.newInstance();

    static {
        xmlInputFactory.setProperty(XMLInputFactory.SUPPORT_DTD, false);
        xmlInputFactory.setProperty(XMLInputFactory.IS_SUPPORTING_EXTERNAL_ENTITIES, false);
        try {
            xmlInputFactory.setProperty("org.codehaus.stax2.internNames", true);
            xmlInputFactory.setProperty("org.codehaus.stax2.internNsUris", true);
            xmlInputFactory.setProperty("org.codehaus.stax2.preserveLocation", false);
        } catch (IllegalArgumentException e) {
            log.debug(e.getMessage(), e);
            //ignore
        }
    }

    private final XMLSecurityProperties securityProperties;

    public InboundXMLSec(XMLSecurityProperties securityProperties) {
        this.securityProperties = securityProperties;
    }

    /**
     * Warning:
     * configure your xmlStreamReader correctly. Otherwise you can create a security hole.
     * At minimum configure the following properties:
     * xmlInputFactory.setProperty(XMLInputFactory.SUPPORT_DTD, false);
     * xmlInputFactory.setProperty(XMLInputFactory.IS_SUPPORTING_EXTERNAL_ENTITIES, false);
     * xmlInputFactory.setProperty(XMLInputFactory.IS_COALESCING, false);
     * xmlInputFactory.setProperty(WstxInputProperties.P_MIN_TEXT_SEGMENT, new Integer(8192));
     * 
     * This method is the entry point for the incoming security-engine.
     * Hand over the original XMLStreamReader and use the returned one for further processing
     *
     * @param xmlStreamReader The original XMLStreamReader
     * @return A new XMLStreamReader which does transparently the security processing.
     * @throws XMLStreamException  thrown when a streaming error occurs
     */
    public XMLStreamReader processInMessage(XMLStreamReader xmlStreamReader) throws XMLStreamException {
        return processInMessage(xmlStreamReader, null, null);
    }

    /**
     * Warning:
     * configure your xmlStreamReader correctly. Otherwise you can create a security hole.
     * At minimum configure the following properties:
     * xmlInputFactory.setProperty(XMLInputFactory.SUPPORT_DTD, false);
     * xmlInputFactory.setProperty(XMLInputFactory.IS_SUPPORTING_EXTERNAL_ENTITIES, false);
     * xmlInputFactory.setProperty(XMLInputFactory.IS_COALESCING, false);
     * xmlInputFactory.setProperty(WstxInputProperties.P_MIN_TEXT_SEGMENT, new Integer(8192));
     * 
     * This method is the entry point for the incoming security-engine.
     * Hand over the original XMLStreamReader and use the returned one for further processing
     *
     * @param xmlStreamReader The original XMLStreamReader
     * @param requestSecurityEvents A List of requested SecurityEvents
     * @param securityEventListener A SecurityEventListener to receive security-relevant events.
     * @return A new XMLStreamReader which does transparently the security processing.
     * @throws XMLStreamException  thrown when a streaming error occurs
     */
    public XMLStreamReader processInMessage(
            XMLStreamReader xmlStreamReader, List requestSecurityEvents,
            SecurityEventListener securityEventListener) throws XMLStreamException {

        if (requestSecurityEvents == null) {
            requestSecurityEvents = Collections.emptyList();
        }

        final InboundSecurityContextImpl inboundSecurityContext = new InboundSecurityContextImpl();
        inboundSecurityContext.putList(SecurityEvent.class, requestSecurityEvents);
        inboundSecurityContext.addSecurityEventListener(securityEventListener);

        inboundSecurityContext.put(XMLSecurityConstants.XMLINPUTFACTORY, xmlInputFactory);

        DocumentContextImpl documentContext = new DocumentContextImpl();
        documentContext.setEncoding(xmlStreamReader.getEncoding() != null ? xmlStreamReader.getEncoding() : "UTF-8");
        //woodstox 3.2.9 returns null when used with a DOMSource
        Location location = xmlStreamReader.getLocation();
        if (location != null) {
            documentContext.setBaseURI(location.getSystemId());
        }

        InputProcessorChainImpl inputProcessorChain = new InputProcessorChainImpl(inboundSecurityContext, documentContext);
        inputProcessorChain.addProcessor(new XMLEventReaderInputProcessor(securityProperties, xmlStreamReader));

        List additionalInputProcessors = securityProperties.getInputProcessorList();
        if (!additionalInputProcessors.isEmpty()) {
            Iterator inputProcessorIterator = additionalInputProcessors.iterator();
            while (inputProcessorIterator.hasNext()) {
                InputProcessor inputProcessor = inputProcessorIterator.next();
                inputProcessorChain.addProcessor(inputProcessor);
            }
        }

        inputProcessorChain.addProcessor(new XMLSecurityInputProcessor(securityProperties));

        if (log.isTraceEnabled()) {
            LogInputProcessor logInputProcessor = new LogInputProcessor(securityProperties);
            logInputProcessor.addAfterProcessor(XMLSecurityInputProcessor.class.getName());
            inputProcessorChain.addProcessor(logInputProcessor);
        }

        return new XMLSecurityStreamReader(inputProcessorChain, securityProperties);
    }
}