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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.wss4j.dom.util;
import org.apache.wss4j.common.ext.Attachment;
import org.apache.wss4j.common.ext.AttachmentRequestCallback;
import org.apache.wss4j.common.ext.AttachmentResultCallback;
import org.apache.wss4j.common.ext.WSSecurityException;
import org.apache.wss4j.common.util.AttachmentUtils;
import org.apache.wss4j.common.util.XMLUtils;
import org.apache.wss4j.dom.WSConstants;
import org.apache.wss4j.dom.WSDataRef;
import org.apache.wss4j.dom.WSDocInfo;
import org.apache.wss4j.dom.callback.CallbackLookup;
import org.apache.xml.security.algorithms.JCEMapper;
import org.apache.xml.security.encryption.Serializer;
import org.apache.xml.security.encryption.XMLCipher;
import org.apache.xml.security.encryption.XMLEncryptionException;
import org.apache.xml.security.parser.XMLParserException;
import org.apache.xml.security.utils.JavaUtils;
import org.w3c.dom.Attr;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.NamedNodeMap;
import org.w3c.dom.Node;
import org.xml.sax.SAXException;
import javax.crypto.Cipher;
import javax.crypto.NoSuchPaddingException;
import javax.crypto.SecretKey;
import javax.security.auth.callback.Callback;
import javax.security.auth.callback.CallbackHandler;
import javax.security.auth.callback.UnsupportedCallbackException;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.security.NoSuchAlgorithmException;
import java.util.List;
public final class EncryptionUtils {
private EncryptionUtils() {
// complete
}
/**
* Look up the encrypted data. First try Id="someURI". If no such Id then try
* wsu:Id="someURI".
*
* @param wsDocInfo The WSDocInfo object to use
* @param dataRefURI The URI of EncryptedData
* @return The EncryptedData element
* @throws WSSecurityException if the EncryptedData element referenced by dataRefURI is
* not found
*/
public static Element
findEncryptedDataElement(
WSDocInfo wsDocInfo,
String dataRefURI
) throws WSSecurityException {
CallbackLookup callbackLookup = wsDocInfo.getCallbackLookup();
Element encryptedDataElement =
callbackLookup.getElement(dataRefURI, null, true);
if (encryptedDataElement == null) {
throw new WSSecurityException(
WSSecurityException.ErrorCode.INVALID_SECURITY, "dataRef",
new Object[] {dataRefURI});
}
if (encryptedDataElement.getLocalName().equals(WSConstants.ENCRYPTED_HEADER)
&& encryptedDataElement.getNamespaceURI().equals(WSConstants.WSSE11_NS)) {
Node child = encryptedDataElement.getFirstChild();
while (child != null && child.getNodeType() != Node.ELEMENT_NODE) {
child = child.getNextSibling();
}
return (Element)child;
}
return encryptedDataElement;
}
/**
* Decrypt the EncryptedData argument using a SecretKey.
* @param doc The (document) owner of EncryptedData
* @param dataRefURI The URI of EncryptedData
* @param encData The EncryptedData element
* @param symmetricKey The SecretKey with which to decrypt EncryptedData
* @param symEncAlgo The symmetric encryption algorithm to use
* @param attachmentCallbackHandler The CallbackHandler from which to get attachments
* @throws WSSecurityException
*/
public static WSDataRef
decryptEncryptedData(
Document doc,
String dataRefURI,
Element encData,
SecretKey symmetricKey,
String symEncAlgo,
CallbackHandler attachmentCallbackHandler
) throws WSSecurityException {
return decryptEncryptedData(doc, dataRefURI, encData, symmetricKey,
symEncAlgo, attachmentCallbackHandler, null);
}
/**
* Decrypt the EncryptedData argument using a SecretKey.
* @param doc The (document) owner of EncryptedData
* @param dataRefURI The URI of EncryptedData
* @param encData The EncryptedData element
* @param symmetricKey The SecretKey with which to decrypt EncryptedData
* @param symEncAlgo The symmetric encryption algorithm to use
* @param attachmentCallbackHandler The CallbackHandler from which to get attachments
* @throws WSSecurityException
*/
public static WSDataRef
decryptEncryptedData(
Document doc,
String dataRefURI,
Element encData,
SecretKey symmetricKey,
String symEncAlgo,
CallbackHandler attachmentCallbackHandler,
Serializer encryptionSerializer
) throws WSSecurityException {
// See if it is an attachment, and handle that differently
String typeStr = encData.getAttributeNS(null, "Type");
String xopURI = getXOPURIFromEncryptedData(encData);
if (typeStr != null
&& (WSConstants.SWA_ATTACHMENT_ENCRYPTED_DATA_TYPE_CONTENT_ONLY.equals(typeStr)
|| WSConstants.SWA_ATTACHMENT_ENCRYPTED_DATA_TYPE_COMPLETE.equals(typeStr))) {
Element cipherData = XMLUtils.getDirectChildElement(encData, "CipherData", WSConstants.ENC_NS);
if (cipherData == null) {
throw new WSSecurityException(WSSecurityException.ErrorCode.FAILED_CHECK);
}
Element cipherReference = XMLUtils.getDirectChildElement(cipherData, "CipherReference", WSConstants.ENC_NS);
if (cipherReference == null) {
throw new WSSecurityException(WSSecurityException.ErrorCode.FAILED_CHECK);
}
String uri = cipherReference.getAttributeNS(null, "URI");
return decryptAttachment(dataRefURI, uri, encData, symmetricKey, symEncAlgo, attachmentCallbackHandler);
}
WSDataRef dataRef = new WSDataRef();
dataRef.setEncryptedElement(encData);
dataRef.setWsuId(dataRefURI);
dataRef.setAlgorithm(symEncAlgo);
boolean content = X509Util.isContent(encData);
dataRef.setContent(content);
Element encDataOrig = encData;
Node parent = encData.getParentNode();
Node previousSibling = encData.getPreviousSibling();
if (content) {
encData = (Element) encData.getParentNode();
parent = encData.getParentNode();
}
XMLCipher xmlCipher = null;
try {
if (encryptionSerializer != null) {
xmlCipher = XMLCipher.getInstance(encryptionSerializer, symEncAlgo);
} else {
xmlCipher = XMLCipher.getInstance(symEncAlgo);
}
xmlCipher.setSecureValidation(true);
xmlCipher.init(XMLCipher.DECRYPT_MODE, symmetricKey);
} catch (XMLEncryptionException ex) {
throw new WSSecurityException(
WSSecurityException.ErrorCode.UNSUPPORTED_ALGORITHM, ex
);
}
Node decryptedNode = null;
try {
if (xopURI != null) {
Element tempEncData;
//if content == true, use encDataOrig (i.e., actual EncryptedData element instead of parent)
//We will replace the EncryptedData element itself with the decrypted data found in attachment
if (content) {
tempEncData = encDataOrig;
} else {
tempEncData = encData;
}
decryptedNode = decryptXopAttachment(symmetricKey, symEncAlgo, attachmentCallbackHandler,
xopURI, tempEncData);
} else {
//in this case, the XMLCipher knows how to handle encData when it's the parent node
// (i.e., when content == true)
xmlCipher.doFinal(doc, encData, content);
}
} catch (Exception ex) {
throw new WSSecurityException(WSSecurityException.ErrorCode.FAILED_CHECK, ex);
}
if (parent.getLocalName().equals(WSConstants.ENCRYPTED_HEADER)
&& parent.getNamespaceURI().equals(WSConstants.WSSE11_NS)
|| parent.getLocalName().equals(WSConstants.ENCRYPED_ASSERTION_LN)
&& parent.getNamespaceURI().equals(WSConstants.SAML2_NS)) {
Node decryptedHeader = parent.getFirstChild();
Node soapHeader = parent.getParentNode();
soapHeader.replaceChild(decryptedHeader, parent);
dataRef.setProtectedElement((Element)decryptedHeader);
dataRef.setXpath(getXPath(decryptedHeader));
} else if (content) {
dataRef.setProtectedElement(encData);
dataRef.setXpath(getXPath(encData));
} else {
if (decryptedNode == null) {
if (previousSibling == null) {
decryptedNode = parent.getFirstChild();
} else {
decryptedNode = previousSibling.getNextSibling();
}
}
if (decryptedNode != null && Node.ELEMENT_NODE == decryptedNode.getNodeType()) {
dataRef.setProtectedElement((Element)decryptedNode);
}
dataRef.setXpath(getXPath(decryptedNode));
}
return dataRef;
}
private static String getXOPURIFromEncryptedData(Element encData) {
Element cipherValue = getCipherValueFromEncryptedData(encData);
if (cipherValue != null) {
return getXOPURIFromCipherValue(cipherValue);
}
return null;
}
public static Element getCipherValueFromEncryptedData(Element encData) {
Element cipherData = XMLUtils.getDirectChildElement(encData, "CipherData", WSConstants.ENC_NS);
if (cipherData != null) {
return XMLUtils.getDirectChildElement(cipherData, "CipherValue", WSConstants.ENC_NS);
}
return null;
}
public static String getXOPURIFromCipherValue(Element cipherValue) {
if (cipherValue != null) {
Element cipherValueChild =
XMLUtils.getDirectChildElement(cipherValue, "Include", WSConstants.XOP_NS);
if (cipherValueChild != null && cipherValueChild.hasAttributeNS(null, "href")) {
return cipherValueChild.getAttributeNS(null, "href");
}
}
return null;
}
private static WSDataRef
decryptAttachment(
String dataRefURI,
String uri,
Element encData,
SecretKey symmetricKey,
String symEncAlgo,
CallbackHandler attachmentCallbackHandler
) throws WSSecurityException {
WSDataRef dataRef = new WSDataRef();
dataRef.setWsuId(dataRefURI);
dataRef.setAlgorithm(symEncAlgo);
try {
if (uri == null || uri.length() < 5 || !uri.startsWith("cid:")) {
throw new WSSecurityException(WSSecurityException.ErrorCode.FAILED_CHECK);
}
dataRef.setWsuId(uri);
dataRef.setAttachment(true);
if (attachmentCallbackHandler == null) {
throw new WSSecurityException(WSSecurityException.ErrorCode.FAILED_CHECK);
}
final String attachmentId = AttachmentUtils.getAttachmentId(uri);
AttachmentRequestCallback attachmentRequestCallback = new AttachmentRequestCallback();
attachmentRequestCallback.setAttachmentId(attachmentId);
attachmentCallbackHandler.handle(new Callback[]{attachmentRequestCallback});
List attachments = attachmentRequestCallback.getAttachments();
if (attachments == null || attachments.isEmpty() || !attachmentId.equals(attachments.get(0).getId())) {
throw new WSSecurityException(
WSSecurityException.ErrorCode.INVALID_SECURITY,
"empty", new Object[] {"Attachment not found"}
);
}
Attachment attachment = attachments.get(0);
final String encAlgo = X509Util.getEncAlgo(encData);
final String jceAlgorithm =
JCEMapper.translateURItoJCEID(encAlgo);
final Cipher cipher = Cipher.getInstance(jceAlgorithm);
InputStream attachmentInputStream = //NOPMD
AttachmentUtils.setupAttachmentDecryptionStream(
encAlgo, cipher, symmetricKey, attachment.getSourceStream());
Attachment resultAttachment = new Attachment();
resultAttachment.setId(attachment.getId());
resultAttachment.setMimeType(encData.getAttributeNS(null, "MimeType"));
resultAttachment.setSourceStream(attachmentInputStream);
resultAttachment.addHeaders(attachment.getHeaders());
String typeStr = encData.getAttributeNS(null, "Type");
if (WSConstants.SWA_ATTACHMENT_ENCRYPTED_DATA_TYPE_COMPLETE.equals(typeStr)) {
AttachmentUtils.readAndReplaceEncryptedAttachmentHeaders(
resultAttachment.getHeaders(), attachmentInputStream);
}
AttachmentResultCallback attachmentResultCallback = new AttachmentResultCallback();
attachmentResultCallback.setAttachment(resultAttachment);
attachmentResultCallback.setAttachmentId(resultAttachment.getId());
attachmentCallbackHandler.handle(new Callback[]{attachmentResultCallback});
} catch (UnsupportedCallbackException | IOException
| NoSuchAlgorithmException | NoSuchPaddingException e) {
throw new WSSecurityException(
WSSecurityException.ErrorCode.FAILED_CHECK, e);
}
dataRef.setContent(true);
// Remove this EncryptedData from the security header to avoid processing it again
encData.getParentNode().removeChild(encData);
return dataRef;
}
private static Node decryptXopAttachment(
SecretKey symmetricKey, String symEncAlgo, CallbackHandler attachmentCallbackHandler,
String xopURI, Element encData
) throws WSSecurityException, IOException, UnsupportedCallbackException, NoSuchAlgorithmException,
NoSuchPaddingException, XMLParserException {
if (attachmentCallbackHandler == null) {
throw new WSSecurityException(WSSecurityException.ErrorCode.FAILED_CHECK);
}
final String attachmentId = AttachmentUtils.getAttachmentId(xopURI);
AttachmentRequestCallback attachmentRequestCallback = new AttachmentRequestCallback();
attachmentRequestCallback.setAttachmentId(attachmentId);
attachmentCallbackHandler.handle(new Callback[]{attachmentRequestCallback});
List attachments = attachmentRequestCallback.getAttachments();
if (attachments == null || attachments.isEmpty() || !attachmentId.equals(attachments.get(0).getId())) {
throw new WSSecurityException(
WSSecurityException.ErrorCode.INVALID_SECURITY,
"empty", new Object[] {"Attachment not found"}
);
}
Attachment attachment = attachments.get(0);
final String jceAlgorithm =
JCEMapper.translateURItoJCEID(symEncAlgo);
final Cipher cipher = Cipher.getInstance(jceAlgorithm);
InputStream attachmentInputStream = //NOPMD
AttachmentUtils.setupAttachmentDecryptionStream(
symEncAlgo, cipher, symmetricKey, attachment.getSourceStream());
// For the xop:Include case, we need to replace the xop:Include Element with the
// decrypted Element
byte[] bytes = JavaUtils.getBytesFromStream(attachmentInputStream);
Document document = null;
try {
document = org.apache.xml.security.utils.XMLUtils.read(new ByteArrayInputStream(bytes), true);
} catch (XMLParserException ex) {
if (ex.getCause() instanceof SAXException) {
// A prefix may not have been bound, try to fix the DOM Element in this case.
String fixedElementStr = setParentPrefixes(encData, new String(bytes));
document = org.apache.xml.security.utils.XMLUtils.read(
new ByteArrayInputStream(fixedElementStr.getBytes()), true);
} else {
throw ex;
}
}
Node decryptedNode =
encData.getOwnerDocument().importNode(document.getDocumentElement(), true);
encData.getParentNode().appendChild(decryptedNode);
encData.getParentNode().removeChild(encData);
return decryptedNode;
}
/**
* Set the parent prefix definitions on the "String" (representation of the Element to be parsed)
*/
private static String setParentPrefixes(Element target, String str) {
Node parent = target;
// Get the point at where to insert new prefix definitions
int insertionIndex = str.indexOf('>');
StringBuilder prefix = new StringBuilder(str.substring(0, insertionIndex));
StringBuilder suffix = new StringBuilder(str.substring(insertionIndex, str.length()));
// Don't add more than 20 prefixes
int prefixAddedCount = 0;
while (parent.getParentNode() != null && prefixAddedCount < 20
&& Node.DOCUMENT_NODE != parent.getParentNode().getNodeType()) {
parent = parent.getParentNode();
NamedNodeMap attributes = parent.getAttributes();
int length = attributes.getLength();
for (int i = 0; i < length; i++) {
Node attribute = attributes.item(i);
String attrDef = "xmlns:" + attribute.getLocalName();
if (WSConstants.XMLNS_NS.equals(attribute.getNamespaceURI()) && !prefix.toString().contains(attrDef)) {
attrDef += "=\"" + attribute.getNodeValue() + "\"";
prefix.append(' ').append(attrDef);
prefixAddedCount++;
}
if (prefixAddedCount >= 20) {
break;
}
}
}
return prefix.toString() + suffix.toString();
}
/**
* @param decryptedNode the decrypted node
* @return a fully built xpath
* (eg. "/soapenv:Envelope/soapenv:Body/ns:decryptedElement")
* if the decryptedNode is an Element or an Attr node and is not detached
* from the document. null otherwise
*/
public static String getXPath(Node decryptedNode) {
if (decryptedNode == null) {
return null;
}
String result = "";
if (Node.ELEMENT_NODE == decryptedNode.getNodeType()) {
result = decryptedNode.getNodeName();
result = prependFullPath(result, decryptedNode.getParentNode());
} else if (Node.ATTRIBUTE_NODE == decryptedNode.getNodeType()) {
result = "@" + decryptedNode.getNodeName();
result = prependFullPath(result, ((Attr)decryptedNode).getOwnerElement());
} else {
return null;
}
return result;
}
/**
* Recursively build an absolute xpath (starting with the root "/")
*
* @param xpath the xpath expression built so far
* @param node the current node whose name is to be prepended
* @return a fully built xpath
*/
private static String prependFullPath(String xpath, Node node) {
if (node == null) {
// probably a detached node... not really useful
return null;
} else if (Node.ELEMENT_NODE == node.getNodeType()) {
xpath = node.getNodeName() + "/" + xpath;
return prependFullPath(xpath, node.getParentNode());
} else if (Node.DOCUMENT_NODE == node.getNodeType()) {
return "/" + xpath;
} else {
return prependFullPath(xpath, node.getParentNode());
}
}
public static String getDigestAlgorithm(Node encBodyData) throws WSSecurityException {
Element tmpE =
XMLUtils.getDirectChildElement(
encBodyData, "EncryptionMethod", WSConstants.ENC_NS
);
if (tmpE != null) {
Element digestElement =
XMLUtils.getDirectChildElement(tmpE, "DigestMethod", WSConstants.SIG_NS);
if (digestElement != null) {
return digestElement.getAttributeNS(null, "Algorithm");
}
}
return null;
}
public static String getMGFAlgorithm(Node encBodyData) throws WSSecurityException {
Element tmpE =
XMLUtils.getDirectChildElement(
encBodyData, "EncryptionMethod", WSConstants.ENC_NS
);
if (tmpE != null) {
Element mgfElement =
XMLUtils.getDirectChildElement(tmpE, "MGF", WSConstants.ENC11_NS);
if (mgfElement != null) {
return mgfElement.getAttributeNS(null, "Algorithm");
}
}
return null;
}
public static byte[] getPSource(Node encBodyData) throws WSSecurityException {
Element tmpE =
XMLUtils.getDirectChildElement(
encBodyData, "EncryptionMethod", WSConstants.ENC_NS
);
if (tmpE != null) {
Element pSourceElement =
XMLUtils.getDirectChildElement(tmpE, "OAEPparams", WSConstants.ENC_NS);
if (pSourceElement != null) {
return getDecodedBase64EncodedData(pSourceElement);
}
}
return new byte[0];
}
/**
* Method getDecodedBase64EncodedData
*
* @param element
* @return a byte array containing the decoded data
* @throws WSSecurityException
*/
public static byte[] getDecodedBase64EncodedData(Element element) throws WSSecurityException {
String text = XMLUtils.getElementText(element);
if (text == null) {
return new byte[0];
}
return org.apache.xml.security.utils.XMLUtils.decode(text);
}
}
