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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.cxf.rs.security.xml;
import java.io.InputStream;
import java.security.PublicKey;
import java.security.cert.X509Certificate;
import javax.xml.stream.XMLStreamReader;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.apache.cxf.helpers.DOMUtils;
import org.apache.cxf.message.Message;
import org.apache.cxf.rs.security.common.CryptoLoader;
import org.apache.cxf.rs.security.common.SecurityUtils;
import org.apache.cxf.rs.security.common.TrustValidator;
import org.apache.cxf.staxutils.W3CDOMStreamReader;
import org.apache.cxf.ws.security.SecurityConstants;
import org.apache.ws.security.WSConstants;
import org.apache.ws.security.components.crypto.Crypto;
import org.apache.xml.security.exceptions.XMLSecurityException;
import org.apache.xml.security.keys.KeyInfo;
import org.apache.xml.security.signature.Reference;
import org.apache.xml.security.signature.SignedInfo;
import org.apache.xml.security.signature.XMLSignature;
import org.apache.xml.security.transforms.Transform;
import org.apache.xml.security.transforms.Transforms;
import org.apache.xml.security.utils.Constants;
public class AbstractXmlSigInHandler extends AbstractXmlSecInHandler {
private boolean removeSignature = true;
private boolean persistSignature = true;
private SignatureProperties sigProps;
public void setRemoveSignature(boolean remove) {
this.removeSignature = remove;
}
public void setPersistSignature(boolean persist) {
this.persistSignature = persist;
}
protected void checkSignature(Message message) {
Document doc = getDocument(message);
if (doc == null) {
return;
}
Element root = doc.getDocumentElement();
Element signatureElement = getSignatureElement(root);
if (signatureElement == null) {
throwFault("XML Signature is not available", null);
}
String cryptoKey = null;
String propKey = null;
if (SecurityUtils.isSignedAndEncryptedTwoWay(message)) {
cryptoKey = SecurityConstants.ENCRYPT_CRYPTO;
propKey = SecurityConstants.ENCRYPT_PROPERTIES;
} else {
cryptoKey = SecurityConstants.SIGNATURE_CRYPTO;
propKey = SecurityConstants.SIGNATURE_PROPERTIES;
}
Crypto crypto = null;
try {
CryptoLoader loader = new CryptoLoader();
crypto = loader.getCrypto(message, cryptoKey, propKey);
} catch (Exception ex) {
throwFault("Crypto can not be loaded", ex);
}
boolean valid = false;
Reference ref = null;
try {
XMLSignature signature = new XMLSignature(signatureElement, "", true);
if (sigProps != null) {
SignedInfo sInfo = signature.getSignedInfo();
if (sigProps.getSignatureAlgo() != null
&& !sigProps.getSignatureAlgo().equals(sInfo.getSignatureMethodURI())) {
throwFault("Signature Algorithm is not supported", null);
}
if (sigProps.getSignatureC14Method() != null
&& !sigProps.getSignatureC14Method().equals(sInfo.getCanonicalizationMethodURI())) {
throwFault("Signature Algorithm is not supported", null);
}
}
ref = getReference(signature);
Element signedElement = validateReference(root, ref);
if (signedElement.hasAttributeNS(null, "ID")) {
signedElement.setIdAttributeNS(null, "ID", true);
}
// See also WSS4J SAMLUtil.getCredentialFromKeyInfo
KeyInfo keyInfo = signature.getKeyInfo();
X509Certificate cert = keyInfo.getX509Certificate();
if (cert != null) {
valid = signature.checkSignatureValue(cert);
} else {
PublicKey pk = keyInfo.getPublicKey();
if (pk != null) {
valid = signature.checkSignatureValue(pk);
}
}
// validate trust
new TrustValidator().validateTrust(crypto, cert, keyInfo.getPublicKey());
if (valid && persistSignature) {
message.setContent(XMLSignature.class, signature);
message.setContent(Element.class, signedElement);
}
} catch (Exception ex) {
throwFault("Signature validation failed", ex);
}
if (!valid) {
throwFault("Signature validation failed", null);
}
if (removeSignature) {
if (!isEnveloping(root)) {
Element signedEl = getSignedElement(root, ref);
signedEl.removeAttribute("ID");
root.removeChild(signatureElement);
} else {
Element actualBody = getActualBody(root);
Document newDoc = DOMUtils.createDocument();
newDoc.adoptNode(actualBody);
root = actualBody;
}
}
message.setContent(XMLStreamReader.class,
new W3CDOMStreamReader(root));
message.setContent(InputStream.class, null);
}
private Element getActualBody(Element envelopingSigElement) {
Element objectNode = getNode(envelopingSigElement, Constants.SignatureSpecNS, "Object", 0);
if (objectNode == null) {
throwFault("Object envelope is not available", null);
}
Element node = DOMUtils.getFirstElement(objectNode);
if (node == null) {
throwFault("No signed data is found", null);
}
return node;
}
private Element getSignatureElement(Element sigParentElement) {
if (isEnveloping(sigParentElement)) {
return sigParentElement;
}
return DOMUtils.getFirstChildWithName(sigParentElement, Constants.SignatureSpecNS, "Signature");
}
protected boolean isEnveloping(Element root) {
return Constants.SignatureSpecNS.equals(root.getNamespaceURI())
&& "Signature".equals(root.getLocalName());
}
protected Reference getReference(XMLSignature sig) {
int count = sig.getSignedInfo().getLength();
if (count != 1) {
throwFault("Multiple Signature Reference are not currently supported", null);
}
try {
return sig.getSignedInfo().item(0);
} catch (XMLSecurityException ex) {
throwFault("Signature Reference is not available", ex);
}
return null;
}
protected Element validateReference(Element root, Reference ref) {
boolean enveloped = false;
String refId = ref.getURI();
if (!refId.startsWith("#") || refId.length() <= 1) {
throwFault("Only local Signature References are supported", null);
}
Element signedEl = getSignedElement(root, ref);
if (signedEl != null) {
enveloped = signedEl == root;
} else {
throwFault("Signature Reference ID is invalid", null);
}
Transforms transforms = null;
try {
transforms = ref.getTransforms();
} catch (XMLSecurityException ex) {
throwFault("Signature transforms can not be obtained", ex);
}
boolean c14TransformConfirmed = false;
String c14TransformExpected = sigProps != null ? sigProps.getSignatureC14Transform() : null;
boolean envelopedConfirmed = false;
for (int i = 0; i < transforms.getLength(); i++) {
try {
Transform tr = transforms.item(i);
if (Transforms.TRANSFORM_ENVELOPED_SIGNATURE.equals(tr.getURI())) {
envelopedConfirmed = true;
} else if (c14TransformExpected != null && c14TransformExpected.equals(tr.getURI())) {
c14TransformConfirmed = true;
}
} catch (Exception ex) {
throwFault("Problem accessing Transform instance", ex);
}
}
if (enveloped && !envelopedConfirmed) {
throwFault("Only enveloped signatures are currently supported", null);
}
if (c14TransformExpected != null && !c14TransformConfirmed) {
throwFault("Transform Canonicalization is not supported", null);
}
if (sigProps != null && sigProps.getSignatureDigestAlgo() != null) {
Element dm =
DOMUtils.getFirstChildWithName(ref.getElement(), Constants.SignatureSpecNS, "DigestMethod");
if (dm != null && !dm.getAttribute("Algorithm").equals(
sigProps.getSignatureDigestAlgo())) {
throwFault("Signature Digest Algorithm is not supported", null);
}
}
return signedEl;
}
private Element getSignedElement(Element root, Reference ref) {
String rootId = root.getAttribute("ID");
String expectedID = ref.getURI().substring(1);
if (!expectedID.equals(rootId)) {
return findElementById(root, expectedID, true);
} else {
return root;
}
}
/**
* Returns the single element that contains an Id with value
* uri and namespace. The Id can be either a wsu:Id or an Id
* with no namespace. This is a replacement for a XPath Id lookup with the given namespace.
* It's somewhat faster than XPath, and we do not deal with prefixes, just with the real
* namespace URI
*
* If checkMultipleElements is true and there are multiple elements, we log a
* warning and return null as this can be used to get around the signature checking.
*
* @param startNode Where to start the search
* @param value Value of the Id attribute
* @param checkMultipleElements If true then go through the entire tree and return
* null if there are multiple elements with the same Id
* @return The found element if there was exactly one match, or
* null otherwise
*/
private static Element findElementById(
Node startNode, String value, boolean checkMultipleElements
) {
//
// Replace the formerly recursive implementation with a depth-first-loop lookup
//
Node startParent = startNode.getParentNode();
Node processedNode = null;
Element foundElement = null;
String id = value;
while (startNode != null) {
// start node processing at this point
if (startNode.getNodeType() == Node.ELEMENT_NODE) {
Element se = (Element) startNode;
// Try the wsu:Id first
String attributeNS = se.getAttributeNS(WSConstants.WSU_NS, "Id");
if ("".equals(attributeNS) || !id.equals(attributeNS)) {
attributeNS = se.getAttributeNS(null, "Id");
}
if ("".equals(attributeNS) || !id.equals(attributeNS)) {
attributeNS = se.getAttributeNS(null, "ID");
}
if (!"".equals(attributeNS) && id.equals(attributeNS)) {
if (!checkMultipleElements) {
return se;
} else if (foundElement == null) {
foundElement = se; // Continue searching to find duplicates
} else {
// Multiple elements with the same 'Id' attribute value
return null;
}
}
}
processedNode = startNode;
startNode = startNode.getFirstChild();
// no child, this node is done.
if (startNode == null) {
// close node processing, get sibling
startNode = processedNode.getNextSibling();
}
// no more siblings, get parent, all children
// of parent are processed.
while (startNode == null) {
processedNode = processedNode.getParentNode();
if (processedNode == startParent) {
return foundElement;
}
// close parent node processing (processed node now)
startNode = processedNode.getNextSibling();
}
}
return foundElement;
}
public void setSignatureProperties(SignatureProperties properties) {
this.sigProps = properties;
}
}
