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The Apache WSS4J project provides a Java implementation of the primary security standards
for Web Services, namely the OASIS Web Services Security (WS-Security) specifications
from the OASIS Web Services Security TC.
/**
* 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.ws.security.message;
import org.apache.ws.security.SOAPConstants;
import org.apache.ws.security.WSConstants;
import org.apache.ws.security.WSEncryptionPart;
import org.apache.ws.security.WSSecurityException;
import org.apache.ws.security.conversation.ConversationException;
import org.apache.ws.security.message.token.Reference;
import org.apache.ws.security.message.token.SecurityTokenReference;
import org.apache.ws.security.util.WSSecurityUtil;
import org.apache.xml.security.encryption.EncryptedData;
import org.apache.xml.security.encryption.XMLCipher;
import org.apache.xml.security.encryption.XMLEncryptionException;
import org.apache.xml.security.keys.KeyInfo;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import javax.crypto.SecretKey;
import java.util.Vector;
/**
* Encrypts and signs parts of a message with derived keys derived from a
* symmetric key. This symmetric key will be included as an EncryptedKey
*
* @author Ruchith Fernando ([email protected])
*/
public class WSSecDKEncrypt extends WSSecDerivedKeyBase {
protected String symEncAlgo = WSConstants.AES_128;
public Document build(Document doc, WSSecHeader secHeader)
throws WSSecurityException, ConversationException {
//
// Setup the encrypted key
//
prepare(doc);
this.envelope = doc.getDocumentElement();
//
// prepend elements in the right order to the security header
//
prependDKElementToHeader(secHeader);
SOAPConstants soapConstants = WSSecurityUtil.getSOAPConstants(envelope);
if (parts == null) {
parts = new Vector();
WSEncryptionPart encP =
new WSEncryptionPart(
soapConstants.getBodyQName().getLocalPart(),
soapConstants.getEnvelopeURI(),
"Content"
);
parts.add(encP);
}
Element externRefList = encryptForExternalRef(null, parts);
addExternalRefElement(externRefList, secHeader);
return doc;
}
private Vector doEncryption(Document doc, byte[] secretKey, Vector references)
throws WSSecurityException {
SecretKey key = WSSecurityUtil.prepareSecretKey(this.symEncAlgo, secretKey);
XMLCipher xmlCipher = null;
try {
xmlCipher = XMLCipher.getInstance(symEncAlgo);
} catch (XMLEncryptionException e3) {
throw new WSSecurityException(
WSSecurityException.UNSUPPORTED_ALGORITHM, null, null, e3
);
}
Vector encDataRefs = new Vector();
if (envelope == null) {
envelope = doc.getDocumentElement();
}
for (int part = 0; part < references.size(); part++) {
WSEncryptionPart encPart = (WSEncryptionPart) references.get(part);
String idToEnc = encPart.getId();
String elemName = encPart.getName();
String nmSpace = encPart.getNamespace();
String modifier = encPart.getEncModifier();
//
// Third step: get the data to encrypt.
//
Element body = null;
if (idToEnc != null) {
body =
WSSecurityUtil.findElementById(
document.getDocumentElement(), idToEnc, WSConstants.WSU_NS
);
if (body == null) {
body =
WSSecurityUtil.findElementById(document.getDocumentElement(), idToEnc, null);
}
} else {
body = (Element) WSSecurityUtil.findElement(envelope, elemName, nmSpace);
}
if (body == null) {
throw new WSSecurityException(
WSSecurityException.FAILURE,
"noEncElement",
new Object[] {"{" + nmSpace + "}" + elemName}
);
}
boolean content = modifier.equals("Content") ? true : false;
String xencEncryptedDataId = wssConfig.getIdAllocator().createId("EncDataId-", body);
//
// Fourth step: encrypt data, and set necessary attributes in
// xenc:EncryptedData
//
try {
// Create the SecurityTokenRef to the DKT
KeyInfo keyInfo = new KeyInfo(document);
SecurityTokenReference secToken = new SecurityTokenReference(document);
Reference ref = new Reference(document);
ref.setURI("#" + dktId);
secToken.setReference(ref);
keyInfo.addUnknownElement(secToken.getElement());
Element keyInfoElement = keyInfo.getElement();
keyInfoElement.setAttributeNS(
WSConstants.XMLNS_NS, "xmlns:" + WSConstants.SIG_PREFIX, WSConstants.SIG_NS
);
xmlCipher.init(XMLCipher.ENCRYPT_MODE, key);
EncryptedData encData = xmlCipher.getEncryptedData();
encData.setId(xencEncryptedDataId);
encData.setKeyInfo(keyInfo);
xmlCipher.doFinal(doc, body, content);
} catch (Exception e2) {
throw new WSSecurityException(
WSSecurityException.FAILED_ENCRYPTION, null, null, e2
);
}
encDataRefs.add("#" + xencEncryptedDataId);
}
return encDataRefs;
}
/**
* Encrypt one or more parts or elements of the message (external).
*
* This method takes a vector of WSEncryptionPart object that
* contain information about the elements to encrypt. The method call the
* encryption method, takes the reference information generated during
* encryption and add this to the xenc:Reference element.
* This method can be called after prepare() and can be
* called multiple times to encrypt a number of parts or elements.
*
* The method generates a xenc:Reference element that must
* be added to the SecurityHeader. See addExternalRefElement().
*
* If the dataRef parameter is null the method
* creates and initializes a new Reference element.
*
* @param dataRef A xenc:Reference element or null
* @param references A vector containing WSEncryptionPart objects
* @return Returns the updated xenc:Reference element
* @throws WSSecurityException
*/
public Element encryptForExternalRef(Element dataRef, Vector references)
throws WSSecurityException {
Vector encDataRefs = doEncryption(document, derivedKeyBytes, references);
Element referenceList = dataRef;
if (referenceList == null) {
referenceList =
document.createElementNS(
WSConstants.ENC_NS, WSConstants.ENC_PREFIX + ":ReferenceList"
);
}
createDataRefList(document, referenceList, encDataRefs);
return referenceList;
}
/**
* Adds (prepends) the external Reference element to the Security header.
*
* The reference element must be created by the
* encryptForExternalRef() method. The method adds the
* reference element in the SecurityHeader.
*
* @param referenceList The external enc:Reference element
* @param secHeader The security header.
*/
public void addExternalRefElement(Element referenceList, WSSecHeader secHeader) {
Node node = dkt.getElement().getNextSibling();
if (node instanceof Element) {
secHeader.getSecurityHeader().insertBefore(referenceList, node);
} else {
// If (at this moment) DerivedKeyToken is the LAST element of
// the security header
secHeader.getSecurityHeader().appendChild(referenceList);
}
}
public static Element createDataRefList(Document doc, Element referenceList, Vector encDataRefs) {
for (int i = 0; i < encDataRefs.size(); i++) {
String dataReferenceUri = (String) encDataRefs.get(i);
Element dataReference =
doc.createElementNS(
WSConstants.ENC_NS, WSConstants.ENC_PREFIX + ":DataReference"
);
dataReference.setAttributeNS(null, "URI", dataReferenceUri);
referenceList.appendChild(dataReference);
}
return referenceList;
}
public void setSymmetricEncAlgorithm(String algo) {
symEncAlgo = algo;
}
/**
* @see org.apache.ws.security.message.WSSecDerivedKeyBase#getDerivedKeyLength()
*/
protected int getDerivedKeyLength() throws WSSecurityException{
return (this.derivedKeyLength > 0) ? this.derivedKeyLength :
WSSecurityUtil.getKeyLength(this.symEncAlgo);
}
}