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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.
/**
* 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 java.io.OutputStream;
import java.security.Key;
import java.security.NoSuchAlgorithmException;
import java.security.PrivateKey;
import java.security.PublicKey;
import java.security.cert.X509Certificate;
import java.util.List;
import javax.crypto.KeyGenerator;
import javax.xml.stream.XMLStreamWriter;
import org.apache.xml.security.exceptions.XMLSecurityException;
import org.apache.xml.security.stax.config.JCEAlgorithmMapper;
import org.apache.xml.security.stax.impl.DocumentContextImpl;
import org.apache.xml.security.stax.impl.OutboundSecurityContextImpl;
import org.apache.xml.security.stax.impl.OutputProcessorChainImpl;
import org.apache.xml.security.stax.impl.XMLSecurityStreamWriter;
import org.apache.xml.security.stax.impl.processor.output.FinalOutputProcessor;
import org.apache.xml.security.stax.impl.processor.output.XMLEncryptOutputProcessor;
import org.apache.xml.security.stax.impl.processor.output.XMLSignatureOutputProcessor;
import org.apache.xml.security.stax.impl.securityToken.GenericOutboundSecurityToken;
import org.apache.xml.security.stax.impl.util.IDGenerator;
import org.apache.xml.security.stax.securityEvent.SecurityEventListener;
import org.apache.xml.security.stax.securityToken.OutboundSecurityToken;
import org.apache.xml.security.stax.securityToken.SecurityTokenConstants;
import org.apache.xml.security.stax.securityToken.SecurityTokenProvider;
/**
* Outbound Streaming-XML-Security
* An instance of this class can be retrieved over the XMLSec class
*
*/
public class OutboundXMLSec {
private final XMLSecurityProperties securityProperties;
public OutboundXMLSec(XMLSecurityProperties securityProperties) {
this.securityProperties = securityProperties;
}
/**
* This method is the entry point for the incoming security-engine.
* Hand over a outputStream and use the returned XMLStreamWriter for further processing
*
* @param outputStream The original outputStream
* @return A new XMLStreamWriter which does transparently the security processing.
* @throws XMLSecurityException thrown when a Security failure occurs
*/
public XMLStreamWriter processOutMessage(OutputStream outputStream, String encoding) throws XMLSecurityException {
return processOutMessage((Object)outputStream, encoding, null);
}
/**
* This method is the entry point for the incoming security-engine.
* Hand over the original XMLStreamWriter and use the returned one for further processing
*
* @param xmlStreamWriter The original xmlStreamWriter
* @return A new XMLStreamWriter which does transparently the security processing.
* @throws XMLSecurityException thrown when a Security failure occurs
*/
public XMLStreamWriter processOutMessage(XMLStreamWriter xmlStreamWriter, String encoding) throws XMLSecurityException {
return processOutMessage((Object)xmlStreamWriter, encoding, null);
}
public XMLStreamWriter processOutMessage(OutputStream outputStream, String encoding,
SecurityEventListener eventListener) throws XMLSecurityException {
return processOutMessage((Object)outputStream, encoding, eventListener);
}
public XMLStreamWriter processOutMessage(XMLStreamWriter xmlStreamWriter, String encoding,
SecurityEventListener eventListener) throws XMLSecurityException {
return processOutMessage((Object) xmlStreamWriter, encoding, eventListener);
}
private XMLStreamWriter processOutMessage(
Object output, String encoding, SecurityEventListener eventListener) throws XMLSecurityException {
final OutboundSecurityContextImpl outboundSecurityContext = new OutboundSecurityContextImpl();
if (eventListener != null) {
outboundSecurityContext.addSecurityEventListener(eventListener);
}
final DocumentContextImpl documentContext = new DocumentContextImpl();
documentContext.setEncoding(encoding);
OutputProcessorChainImpl outputProcessorChain = new OutputProcessorChainImpl(outboundSecurityContext, documentContext);
SecurePart signEntireRequestPart = null;
SecurePart encryptEntireRequestPart = null;
int actionOrder = 0;
for (XMLSecurityConstants.Action action : securityProperties.getActions()) {
if (XMLSecurityConstants.SIGNATURE.equals(action)) {
XMLSignatureOutputProcessor signatureOutputProcessor = new XMLSignatureOutputProcessor();
initializeOutputProcessor(outputProcessorChain, signatureOutputProcessor, action, actionOrder++);
configureSignatureKeys(outboundSecurityContext);
List signatureParts = securityProperties.getSignatureSecureParts();
for (SecurePart securePart : signatureParts) {
if (securePart.getIdToSecure() == null && securePart.getName() != null) {
outputProcessorChain.getSecurityContext().putAsMap(
XMLSecurityConstants.SIGNATURE_PARTS,
securePart.getName(),
securePart
);
} else if (securePart.getIdToSecure() != null) {
outputProcessorChain.getSecurityContext().putAsMap(
XMLSecurityConstants.SIGNATURE_PARTS,
securePart.getIdToSecure(),
securePart
);
} else if (securePart.getExternalReference() != null) {
outputProcessorChain.getSecurityContext().putAsMap(
XMLSecurityConstants.SIGNATURE_PARTS,
securePart.getExternalReference(),
securePart
);
} else if (securePart.isSecureEntireRequest()) {
// Special functionality to sign the first element in the request
signEntireRequestPart = securePart;
}
}
} else if (XMLSecurityConstants.ENCRYPTION.equals(action)) {
XMLEncryptOutputProcessor encryptOutputProcessor = new XMLEncryptOutputProcessor();
initializeOutputProcessor(outputProcessorChain, encryptOutputProcessor, action, actionOrder++);
configureEncryptionKeys(outboundSecurityContext);
List encryptionParts = securityProperties.getEncryptionSecureParts();
for (SecurePart securePart : encryptionParts) {
if (securePart.getIdToSecure() == null && securePart.getName() != null) {
outputProcessorChain.getSecurityContext().putAsMap(
XMLSecurityConstants.ENCRYPTION_PARTS,
securePart.getName(),
securePart
);
} else if (securePart.getIdToSecure() != null) {
outputProcessorChain.getSecurityContext().putAsMap(
XMLSecurityConstants.ENCRYPTION_PARTS,
securePart.getIdToSecure(),
securePart
);
} else if (securePart.isSecureEntireRequest()) {
// Special functionality to encrypt the first element in the request
encryptEntireRequestPart = securePart;
}
}
}
}
if (output instanceof OutputStream) {
final FinalOutputProcessor finalOutputProcessor = new FinalOutputProcessor((OutputStream) output, encoding);
initializeOutputProcessor(outputProcessorChain, finalOutputProcessor, null, -1);
} else if (output instanceof XMLStreamWriter) {
final FinalOutputProcessor finalOutputProcessor = new FinalOutputProcessor((XMLStreamWriter) output);
initializeOutputProcessor(outputProcessorChain, finalOutputProcessor, null, -1);
} else {
throw new IllegalArgumentException(output + " is not supported as output");
}
XMLSecurityStreamWriter streamWriter = new XMLSecurityStreamWriter(outputProcessorChain);
streamWriter.setSignEntireRequestPart(signEntireRequestPart);
streamWriter.setEncryptEntireRequestPart(encryptEntireRequestPart);
return streamWriter;
}
private void initializeOutputProcessor(OutputProcessorChainImpl outputProcessorChain, OutputProcessor outputProcessor, XMLSecurityConstants.Action action, int actionOrder) throws XMLSecurityException {
outputProcessor.setXMLSecurityProperties(securityProperties);
outputProcessor.setAction(action, actionOrder);
outputProcessor.init(outputProcessorChain);
}
private void configureSignatureKeys(final OutboundSecurityContextImpl outboundSecurityContext) throws XMLSecurityException {
Key key = securityProperties.getSignatureKey();
X509Certificate[] x509Certificates = securityProperties.getSignatureCerts();
if (key instanceof PrivateKey && (x509Certificates == null || x509Certificates.length == 0)
&& securityProperties.getSignatureVerificationKey() == null) {
throw new XMLSecurityException("stax.signature.publicKeyOrCertificateMissing");
}
final String securityTokenid = IDGenerator.generateID("SIG");
final OutboundSecurityToken securityToken =
new GenericOutboundSecurityToken(securityTokenid, SecurityTokenConstants.DefaultToken, key, x509Certificates);
if (securityProperties.getSignatureVerificationKey() instanceof PublicKey) {
((GenericOutboundSecurityToken)securityToken).setPublicKey(
(PublicKey)securityProperties.getSignatureVerificationKey());
}
final SecurityTokenProvider securityTokenProvider =
new SecurityTokenProvider() {
@Override
public OutboundSecurityToken getSecurityToken() throws XMLSecurityException {
return securityToken;
}
@Override
public String getId() {
return securityTokenid;
}
};
outboundSecurityContext.registerSecurityTokenProvider(securityTokenid, securityTokenProvider);
outboundSecurityContext.put(XMLSecurityConstants.PROP_USE_THIS_TOKEN_ID_FOR_SIGNATURE, securityTokenid);
}
private void configureEncryptionKeys(final OutboundSecurityContextImpl outboundSecurityContext) throws XMLSecurityException {
// Sort out transport keys / key wrapping keys first.
Key transportKey = securityProperties.getEncryptionTransportKey();
X509Certificate transportCert = securityProperties.getEncryptionUseThisCertificate();
X509Certificate[] transportCerts = null;
if (transportCert != null) {
transportCerts = new X509Certificate[]{transportCert};
}
final OutboundSecurityToken transportSecurityToken =
new GenericOutboundSecurityToken(IDGenerator.generateID(null), SecurityTokenConstants.DefaultToken, transportKey, transportCerts);
// Now sort out the session key
Key key = securityProperties.getEncryptionKey();
if (key == null) {
if (transportCert == null && transportKey == null) {
throw new XMLSecurityException("stax.encryption.encryptionKeyMissing");
}
// If none is configured then generate one
String keyAlgorithm =
JCEAlgorithmMapper.getJCEKeyAlgorithmFromURI(securityProperties.getEncryptionSymAlgorithm());
KeyGenerator keyGen;
try {
keyGen = KeyGenerator.getInstance(keyAlgorithm);
} catch (NoSuchAlgorithmException e) {
throw new XMLSecurityException(e);
}
//the sun JCE provider expects the real key size for 3DES (112 or 168 bit)
//whereas bouncy castle expects the block size of 128 or 192 bits
if (keyAlgorithm.contains("AES")) {
int keyLength =
JCEAlgorithmMapper.getKeyLengthFromURI(securityProperties.getEncryptionSymAlgorithm());
keyGen.init(keyLength);
}
key = keyGen.generateKey();
}
final String securityTokenid = IDGenerator.generateID(null);
final GenericOutboundSecurityToken securityToken =
new GenericOutboundSecurityToken(securityTokenid, SecurityTokenConstants.DefaultToken, key);
securityToken.setKeyWrappingToken(transportSecurityToken);
final SecurityTokenProvider securityTokenProvider =
new SecurityTokenProvider() {
@Override
public OutboundSecurityToken getSecurityToken() throws XMLSecurityException {
return securityToken;
}
@Override
public String getId() {
return securityTokenid;
}
};
outboundSecurityContext.registerSecurityTokenProvider(securityTokenid, securityTokenProvider);
outboundSecurityContext.put(XMLSecurityConstants.PROP_USE_THIS_TOKEN_ID_FOR_ENCRYPTION, securityTokenid);
}
}