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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.
The newest version!
/**
* 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.utils;
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.lang.System.Logger;
import java.lang.System.Logger.Level;
import java.math.BigInteger;
import java.nio.file.Files;
import java.security.AccessController;
import java.security.PrivilegedAction;
import java.util.ArrayList;
import java.util.Base64;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
import java.util.stream.Collectors;
import org.apache.xml.security.c14n.CanonicalizationException;
import org.apache.xml.security.c14n.Canonicalizer;
import org.apache.xml.security.c14n.InvalidCanonicalizerException;
import org.apache.xml.security.parser.XMLParser;
import org.apache.xml.security.parser.XMLParserException;
import org.apache.xml.security.parser.XMLParserImpl;
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.w3c.dom.NodeList;
import org.w3c.dom.Text;
import static java.nio.charset.StandardCharsets.UTF_8;
/**
* DOM and XML accessibility and comfort functions.
*
*/
public final class XMLUtils {
private static boolean ignoreLineBreaks =
AccessController.doPrivileged(
(PrivilegedAction) () -> Boolean.getBoolean("org.apache.xml.security.ignoreLineBreaks"));
private static final Logger LOG = System.getLogger(XMLUtils.class.getName());
private static XMLParser xmlParserImpl =
AccessController.doPrivileged(
(PrivilegedAction) () -> {
String xmlParserClass = System.getProperty("org.apache.xml.security.XMLParser");
if (xmlParserClass != null) {
try {
return (XMLParser) JavaUtils.newInstanceWithEmptyConstructor(
ClassLoaderUtils.loadClass(xmlParserClass, XMLUtils.class));
} catch (ClassNotFoundException | IllegalAccessException | InstantiationException e) {
LOG.log(Level.ERROR, "Error instantiating XMLParser. Falling back to XMLParserImpl", e);
}
}
return new XMLParserImpl();
});
private static volatile String dsPrefix = "ds";
private static volatile String ds11Prefix = "dsig11";
private static volatile String xencPrefix = "xenc";
private static volatile String xenc11Prefix = "xenc11";
/**
* Constructor XMLUtils
*
*/
private XMLUtils() {
// we don't allow instantiation
}
/**
* Set the prefix for the digital signature namespace
* @param prefix the new prefix for the digital signature namespace
* @throws SecurityException if a security manager is installed and the
* caller does not have permission to set the prefix
*/
public static void setDsPrefix(String prefix) {
JavaUtils.checkRegisterPermission();
dsPrefix = prefix;
}
/**
* Set the prefix for the digital signature 1.1 namespace
* @param prefix the new prefix for the digital signature 1.1 namespace
* @throws SecurityException if a security manager is installed and the
* caller does not have permission to set the prefix
*/
public static void setDs11Prefix(String prefix) {
JavaUtils.checkRegisterPermission();
ds11Prefix = prefix;
}
/**
* Set the prefix for the encryption namespace
* @param prefix the new prefix for the encryption namespace
* @throws SecurityException if a security manager is installed and the
* caller does not have permission to set the prefix
*/
public static void setXencPrefix(String prefix) {
JavaUtils.checkRegisterPermission();
xencPrefix = prefix;
}
/**
* Set the prefix for the encryption namespace 1.1
* @param prefix the new prefix for the encryption namespace 1.1
* @throws SecurityException if a security manager is installed and the
* caller does not have permission to set the prefix
*/
public static void setXenc11Prefix(String prefix) {
JavaUtils.checkRegisterPermission();
xenc11Prefix = prefix;
}
public static Element getNextElement(Node el) {
Node node = el;
while (node != null && node.getNodeType() != Node.ELEMENT_NODE) {
node = node.getNextSibling();
}
return (Element)node;
}
/**
* @param rootNode
* @param result
* @param exclude
* @param comments whether comments or not
*/
public static void getSet(Node rootNode, Set result, Node exclude, boolean comments) {
if (exclude != null && isDescendantOrSelf(exclude, rootNode)) {
return;
}
getSetRec(rootNode, result, exclude, comments);
}
private static void getSetRec(final Node rootNode, final Set result,
final Node exclude, final boolean comments) {
if (rootNode == exclude) {
return;
}
switch (rootNode.getNodeType()) { //NOPMD
case Node.ELEMENT_NODE:
result.add(rootNode);
Element el = (Element)rootNode;
if (el.hasAttributes()) {
NamedNodeMap nl = el.getAttributes();
int length = nl.getLength();
for (int i = 0; i < length; i++) {
result.add(nl.item(i));
}
}
//no return keep working
case Node.DOCUMENT_NODE:
for (Node r = rootNode.getFirstChild(); r != null; r = r.getNextSibling()) {
if (r.getNodeType() == Node.TEXT_NODE) {
result.add(r);
while (r != null && r.getNodeType() == Node.TEXT_NODE) {
r = r.getNextSibling();
}
if (r == null) {
return;
}
}
getSetRec(r, result, exclude, comments);
}
break;
case Node.COMMENT_NODE:
if (comments) {
result.add(rootNode);
}
break;
case Node.DOCUMENT_TYPE_NODE:
break;
default:
result.add(rootNode);
}
}
/**
* Outputs a DOM tree to a {@link File}.
*
* @param contextNode root node of the DOM tree
* @param outputFile the file to write to
* @throws IOException
*/
public static void outputDOM(Node contextNode, File outputFile) throws IOException {
try (OutputStream os = new BufferedOutputStream(Files.newOutputStream(outputFile.toPath()), 8192)) {
outputDOM(contextNode, os, false);
}
}
/**
* Outputs a DOM tree to an {@link OutputStream}.
*
* @param contextNode root node of the DOM tree
* @param os the {@link OutputStream}
*/
public static void outputDOM(Node contextNode, OutputStream os) {
outputDOM(contextNode, os, false);
}
/**
* Outputs a DOM tree to an {@link OutputStream}. If an Exception is
* thrown during execution, it's StackTrace is output to System.out, but the
* Exception is not re-thrown.
*
* @param contextNode root node of the DOM tree
* @param os the {@link OutputStream}
* @param addPreamble
*/
public static void outputDOM(Node contextNode, OutputStream os, boolean addPreamble) {
try {
if (addPreamble) {
os.write("\n".getBytes(UTF_8));
}
Canonicalizer.getInstance(
Canonicalizer.ALGO_ID_C14N_PHYSICAL).canonicalizeSubtree(contextNode, os);
} catch (IOException | InvalidCanonicalizerException | CanonicalizationException ex) {
LOG.log(Level.ERROR, ex.getMessage(), ex);
}
}
/**
* Serializes the contextNode into the OutputStream, but
* suppresses all Exceptions.
*
* NOTE: This should only be used for debugging purposes,
* NOT in a production environment; this method ignores all exceptions,
* so you won't notice if something goes wrong. If you're asking what is to
* be used in a production environment, simply use the code inside the
* try{} statement, but handle the Exceptions appropriately.
*
* @param contextNode
* @param os
*/
public static void outputDOMc14nWithComments(Node contextNode, OutputStream os) {
try {
Canonicalizer.getInstance(
Canonicalizer.ALGO_ID_C14N_WITH_COMMENTS).canonicalizeSubtree(contextNode, os);
} catch (InvalidCanonicalizerException | CanonicalizationException ex) {
LOG.log(Level.ERROR, ex.getMessage(), ex);
// throw new RuntimeException(ex.getMessage());
}
}
/**
* Method getFullTextChildrenFromNode
*
* @param node
* @return the string of children
*/
public static String getFullTextChildrenFromNode(Node node) {
StringBuilder sb = new StringBuilder();
Node child = node.getFirstChild();
while (child != null) {
if (child.getNodeType() == Node.TEXT_NODE) {
sb.append(((Text)child).getData());
}
child = child.getNextSibling();
}
return sb.toString();
}
/**
* Creates an Element in the XML Signature specification namespace.
*
* @param doc the factory Document
* @param elementName the local name of the Element
* @return the Element
*/
public static Element createElementInSignatureSpace(Document doc, String elementName) {
if (doc == null) {
throw new RuntimeException("Document is null");
}
if (dsPrefix == null || dsPrefix.length() == 0) {
return doc.createElementNS(Constants.SignatureSpecNS, elementName);
}
return doc.createElementNS(Constants.SignatureSpecNS, dsPrefix + ":" + elementName);
}
/**
* Creates an Element in the XML Signature 1.1 specification namespace.
*
* @param doc the factory Document
* @param elementName the local name of the Element
* @return the Element
*/
public static Element createElementInSignature11Space(Document doc, String elementName) {
if (doc == null) {
throw new RuntimeException("Document is null");
}
if (ds11Prefix == null || ds11Prefix.length() == 0) {
return doc.createElementNS(Constants.SignatureSpec11NS, elementName);
}
return doc.createElementNS(Constants.SignatureSpec11NS, ds11Prefix + ":" + elementName);
}
/**
* Creates an Element in the XML Encryption specification namespace.
*
* @param doc the factory Document
* @param elementName the local name of the Element
* @return the Element
*/
public static Element createElementInEncryptionSpace(Document doc, String elementName) {
if (doc == null) {
throw new RuntimeException("Document is null");
}
if (xencPrefix == null || xencPrefix.length() == 0) {
return doc.createElementNS(EncryptionConstants.EncryptionSpecNS, elementName);
}
return
doc.createElementNS(
EncryptionConstants.EncryptionSpecNS, xencPrefix + ":" + elementName
);
}
/**
* Creates an Element in the XML Encryption 1.1 specification namespace.
*
* @param doc the factory Document
* @param elementName the local name of the Element
* @return the Element
*/
public static Element createElementInEncryption11Space(Document doc, String elementName) {
if (doc == null) {
throw new RuntimeException("Document is null");
}
if (xenc11Prefix == null || xenc11Prefix.length() == 0) {
return doc.createElementNS(EncryptionConstants.EncryptionSpec11NS, elementName);
}
return
doc.createElementNS(
EncryptionConstants.EncryptionSpec11NS, xenc11Prefix + ":" + elementName
);
}
/**
* Returns true if the element is in XML Signature namespace and the local
* name equals the supplied one.
*
* @param element
* @param localName
* @return true if the element is in XML Signature namespace and the local name equals
* the supplied one
*/
public static boolean elementIsInSignatureSpace(Element element, String localName) {
if (element == null){
return false;
}
return Constants.SignatureSpecNS.equals(element.getNamespaceURI())
&& element.getLocalName().equals(localName);
}
/**
* Returns true if the element is in XML Signature 1.1 namespace and the local
* name equals the supplied one.
*
* @param element
* @param localName
* @return true if the element is in XML Signature namespace and the local name equals
* the supplied one
*/
public static boolean elementIsInSignature11Space(Element element, String localName) {
if (element == null) {
return false;
}
return Constants.SignatureSpec11NS.equals(element.getNamespaceURI())
&& element.getLocalName().equals(localName);
}
/**
* Returns true if the element is in XML Encryption namespace and the local
* name equals the supplied one.
*
* @param element
* @param localName
* @return true if the element is in XML Encryption namespace and the local name
* equals the supplied one
*/
public static boolean elementIsInEncryptionSpace(Element element, String localName) {
if (element == null){
return false;
}
return EncryptionConstants.EncryptionSpecNS.equals(element.getNamespaceURI())
&& element.getLocalName().equals(localName);
}
/**
* Returns true if the element is in XML Encryption 1.1 namespace and the local
* name equals the supplied one.
*
* @param element
* @param localName
* @return true if the element is in XML Encryption 1.1 namespace and the local name
* equals the supplied one
*/
public static boolean elementIsInEncryption11Space(Element element, String localName) {
if (element == null){
return false;
}
return EncryptionConstants.EncryptionSpec11NS.equals(element.getNamespaceURI())
&& element.getLocalName().equals(localName);
}
/**
* This method returns the owner document of a particular node.
* This method is necessary because it always returns a
* {@link Document}. {@link Node#getOwnerDocument} returns null
* if the {@link Node} is a {@link Document}.
*
* @param node
* @return the owner document of the node
*/
public static Document getOwnerDocument(Node node) {
if (node.getNodeType() == Node.DOCUMENT_NODE) {
return (Document) node;
}
try {
return node.getOwnerDocument();
} catch (NullPointerException npe) {
throw new NullPointerException(I18n.translate("endorsed.jdk1.4.0")
+ " Original message was \""
+ npe.getMessage() + "\"");
}
}
/**
* This method returns the first non-null owner document of the Nodes in this Set.
* This method is necessary because it always returns a
* {@link Document}. {@link Node#getOwnerDocument} returns null
* if the {@link Node} is a {@link Document}.
*
* @param xpathNodeSet
* @return the owner document
*/
public static Document getOwnerDocument(Set xpathNodeSet) {
NullPointerException npe = null;
for (Node node : xpathNodeSet) {
int nodeType = node.getNodeType();
if (nodeType == Node.DOCUMENT_NODE) {
return (Document) node;
}
try {
if (nodeType == Node.ATTRIBUTE_NODE) {
return ((Attr)node).getOwnerElement().getOwnerDocument();
}
return node.getOwnerDocument();
} catch (NullPointerException e) {
npe = e;
}
}
throw new NullPointerException(I18n.translate("endorsed.jdk1.4.0")
+ " Original message was \""
+ (npe == null ? "" : npe.getMessage()) + "\"");
}
/**
* Method addReturnToElement
*
* @param e
*/
public static void addReturnToElement(Element e) {
if (!ignoreLineBreaks) {
Document doc = e.getOwnerDocument();
e.appendChild(doc.createTextNode("\n"));
}
}
public static void addReturnToElement(Document doc, HelperNodeList nl) {
if (!ignoreLineBreaks) {
nl.appendChild(doc.createTextNode("\n"));
}
}
public static void addReturnBeforeChild(Element e, Node child) {
if (!ignoreLineBreaks) {
Document doc = e.getOwnerDocument();
e.insertBefore(doc.createTextNode("\n"), child);
}
}
public static String encodeToString(byte[] bytes) {
if (ignoreLineBreaks) {
return Base64.getEncoder().encodeToString(bytes);
}
return Base64.getMimeEncoder().encodeToString(bytes);
}
public static byte[] decode(String encodedString) {
return Base64.getMimeDecoder().decode(encodedString);
}
public static byte[] decode(byte[] encodedBytes) {
return Base64.getMimeDecoder().decode(encodedBytes);
}
public static boolean isIgnoreLineBreaks() {
return ignoreLineBreaks;
}
/**
* Method convertNodelistToSet
*
* @param xpathNodeSet
* @return the set with the nodelist
*/
public static Set convertNodelistToSet(NodeList xpathNodeSet) {
if (xpathNodeSet == null) {
return new HashSet<>();
}
int length = xpathNodeSet.getLength();
Set set = new HashSet<>(length);
for (int i = 0; i < length; i++) {
set.add(xpathNodeSet.item(i));
}
return set;
}
/**
* This method spreads all namespace attributes in a DOM document to their
* children. This is needed because the XML Signature XPath transform
* must evaluate the XPath against all nodes in the input, even against
* XPath namespace nodes. Through a bug in XalanJ2, the namespace nodes are
* not fully visible in the Xalan XPath model, so we have to do this by
* hand in DOM spaces so that the nodes become visible in XPath space.
*
* @param doc
* @see
* Namespace axis resolution is not XPath compliant
*/
public static void circumventBug2650(Document doc) {
Element documentElement = doc.getDocumentElement();
// if the document element has no xmlns definition, we add xmlns=""
Attr xmlnsAttr =
documentElement.getAttributeNodeNS(Constants.NamespaceSpecNS, "xmlns");
if (xmlnsAttr == null) {
documentElement.setAttributeNS(Constants.NamespaceSpecNS, "xmlns", "");
}
XMLUtils.circumventBug2650internal(doc);
}
/**
* This is the work horse for {@link #circumventBug2650}.
*
* @param node
* @see
* Namespace axis resolution is not XPath compliant
*/
@SuppressWarnings("fallthrough")
private static void circumventBug2650internal(Node node) {
Node parent = null;
Node sibling = null;
final String namespaceNs = Constants.NamespaceSpecNS;
do { //NOPMD
switch (node.getNodeType()) {
case Node.ELEMENT_NODE :
Element element = (Element) node;
if (!element.hasChildNodes()) {
break;
}
if (element.hasAttributes()) {
NamedNodeMap attributes = element.getAttributes();
int attributesLength = attributes.getLength();
for (Node child = element.getFirstChild(); child!=null;
child = child.getNextSibling()) {
if (child.getNodeType() != Node.ELEMENT_NODE) {
continue;
}
Element childElement = (Element) child;
for (int i = 0; i < attributesLength; i++) {
Attr currentAttr = (Attr) attributes.item(i);
if (!namespaceNs.equals(currentAttr.getNamespaceURI())) {
continue;
}
if (childElement.hasAttributeNS(namespaceNs,
currentAttr.getLocalName())) {
continue;
}
childElement.setAttributeNS(namespaceNs,
currentAttr.getName(),
currentAttr.getNodeValue());
}
}
}
case Node.ENTITY_REFERENCE_NODE :
case Node.DOCUMENT_NODE :
parent = node;
sibling = node.getFirstChild();
break;
}
while (sibling == null && parent != null) {
sibling = parent.getNextSibling();
parent = parent.getParentNode();
}
if (sibling == null) {
return;
}
node = sibling;
sibling = node.getNextSibling();
} while (true);
}
/**
* @param sibling
* @param nodeName
* @param number
* @return nodes with the constraint
*/
public static Element selectDsNode(Node sibling, String nodeName, int number) {
while (sibling != null) {
if (Constants.SignatureSpecNS.equals(sibling.getNamespaceURI())
&& sibling.getLocalName().equals(nodeName)) {
if (number == 0) {
return (Element)sibling;
}
number--;
}
sibling = sibling.getNextSibling();
}
return null;
}
/**
* @param sibling
* @param nodeName
* @param number
* @return nodes with the constraint
*/
public static Element selectDs11Node(Node sibling, String nodeName, int number) {
while (sibling != null) {
if (Constants.SignatureSpec11NS.equals(sibling.getNamespaceURI())
&& sibling.getLocalName().equals(nodeName)) {
if (number == 0) {
return (Element)sibling;
}
number--;
}
sibling = sibling.getNextSibling();
}
return null;
}
/**
* @param sibling
* @param nodeName
* @param number
* @return nodes with the constrain
*/
public static Element selectXencNode(Node sibling, String nodeName, int number) {
while (sibling != null) {
if (EncryptionConstants.EncryptionSpecNS.equals(sibling.getNamespaceURI())
&& sibling.getLocalName().equals(nodeName)) {
if (number == 0){
return (Element)sibling;
}
number--;
}
sibling = sibling.getNextSibling();
}
return null;
}
/**
* Helper method to get the "number"-th element for a given local
* name and namespace: http://www.w3.org/2009/xmlenc11#. If element with given search parameters is not found,
* null is returned.
*
* @param sibling the sibling node from which to start searching
* @param nodeName the local name of the element to search for
* @param number the index of the element to search for
* @return node with the given node name or null if not found.
*/
public static Element selectXenc11Node(Node sibling, String nodeName, int number) {
return selectNode(sibling, EncryptionConstants.EncryptionSpec11NS, nodeName, number);
}
/**
* @param sibling
* @param uri
* @param nodeName
* @param number
* @return nodes with the constrain
*/
public static Element selectNode(Node sibling, String uri, String nodeName, int number) {
while (sibling != null) {
if (sibling.getNamespaceURI() != null && sibling.getNamespaceURI().equals(uri)
&& sibling.getLocalName().equals(nodeName)) {
if (number == 0) {
return (Element)sibling;
}
number--;
}
sibling = sibling.getNextSibling();
}
return null;
}
/**
* @param sibling
* @param nodeName
* @return nodes with the constrain
*/
public static Element[] selectDsNodes(Node sibling, String nodeName) {
return selectNodes(sibling, Constants.SignatureSpecNS, nodeName);
}
/**
* @param sibling
* @param nodeName
* @return nodes with the constrain
*/
public static Element[] selectDs11Nodes(Node sibling, String nodeName) {
return selectNodes(sibling, Constants.SignatureSpec11NS, nodeName);
}
/**
* @param sibling
* @param uri
* @param nodeName
* @return nodes with the constraint
*/
public static Element[] selectNodes(Node sibling, String uri, String nodeName) {
List list = new ArrayList<>();
while (sibling != null) {
if (sibling.getNamespaceURI() != null && sibling.getNamespaceURI().equals(uri)
&& sibling.getLocalName().equals(nodeName)) {
list.add((Element)sibling);
}
sibling = sibling.getNextSibling();
}
return list.toArray(new Element[list.size()]);
}
/**
* @param signatureElement
* @param inputSet
* @return nodes with the constrain
*/
public static Set excludeNodeFromSet(Node signatureElement, Set inputSet) {
return inputSet.stream().filter((inputNode) ->
!XMLUtils.isDescendantOrSelf(signatureElement, inputNode)).collect(Collectors.toSet());
}
/**
* Method getStrFromNode
*
* @param xpathnode
* @return the string for the node.
*/
public static String getStrFromNode(Node xpathnode) {
if (xpathnode.getNodeType() == Node.TEXT_NODE) {
// we iterate over all siblings of the context node because eventually,
// the text is "polluted" with pi's or comments
StringBuilder sb = new StringBuilder();
for (Node currentSibling = xpathnode.getParentNode().getFirstChild();
currentSibling != null;
currentSibling = currentSibling.getNextSibling()) {
if (currentSibling.getNodeType() == Node.TEXT_NODE) {
sb.append(((Text) currentSibling).getData());
}
}
return sb.toString();
} else if (xpathnode.getNodeType() == Node.ATTRIBUTE_NODE) {
return xpathnode.getNodeValue();
} else if (xpathnode.getNodeType() == Node.PROCESSING_INSTRUCTION_NODE) {
return xpathnode.getNodeValue();
}
return null;
}
/**
* Returns true if the descendantOrSelf is on the descendant-or-self axis
* of the context node.
*
* @param ctx
* @param descendantOrSelf
* @return true if the node is descendant
*/
public static boolean isDescendantOrSelf(Node ctx, Node descendantOrSelf) {
if (ctx == descendantOrSelf) {
return true;
}
Node parent = descendantOrSelf;
while (true) {
if (parent == null) {
return false;
}
if (parent == ctx) {
return true;
}
if (parent.getNodeType() == Node.ATTRIBUTE_NODE) {
parent = ((Attr) parent).getOwnerElement();
} else {
parent = parent.getParentNode();
}
}
}
public static boolean ignoreLineBreaks() {
return ignoreLineBreaks;
}
/**
* This method is a tree-search to help prevent against wrapping attacks. It checks that no
* two Elements have ID Attributes that match the "value" argument, if this is the case then
* "false" is returned. Note that a return value of "true" does not necessarily mean that
* a matching Element has been found, just that no wrapping attack has been detected.
*/
public static boolean protectAgainstWrappingAttack(Node startNode, String value) {
String id = value.trim();
if (!id.isEmpty() && id.charAt(0) == '#') {
id = id.substring(1);
}
Node startParent = null;
Node processedNode = null;
Element foundElement = null;
if (startNode != null) {
startParent = startNode.getParentNode();
}
while (startNode != null) {
if (startNode.getNodeType() == Node.ELEMENT_NODE) {
Element se = (Element) startNode;
NamedNodeMap attributes = se.getAttributes();
if (attributes != null) {
int length = attributes.getLength();
for (int i = 0; i < length; i++) {
Attr attr = (Attr)attributes.item(i);
if (attr.isId() && id.equals(attr.getValue())) {
if (foundElement == null) {
// Continue searching to find duplicates
foundElement = attr.getOwnerElement();
} else {
LOG.log(Level.WARNING, "Multiple elements with the same 'Id' attribute value!");
return false;
}
}
}
}
}
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 true;
}
// close parent node processing (processed node now)
startNode = processedNode.getNextSibling();
}
}
return true;
}
/**
* This method is a tree-search to help prevent against wrapping attacks. It checks that no other
* Element than the given "knownElement" argument has an ID attribute that matches the "value"
* argument, which is the ID value of "knownElement". If this is the case then "false" is returned.
*/
public static boolean protectAgainstWrappingAttack(
Node startNode, Element knownElement, String value
) {
String id = value.trim();
if (!id.isEmpty() && id.charAt(0) == '#') {
id = id.substring(1);
}
Node startParent = null;
Node processedNode = null;
if (startNode != null) {
startParent = startNode.getParentNode();
}
while (startNode != null) {
if (startNode.getNodeType() == Node.ELEMENT_NODE) {
Element se = (Element) startNode;
NamedNodeMap attributes = se.getAttributes();
if (attributes != null) {
int length = attributes.getLength();
for (int i = 0; i < length; i++) {
Attr attr = (Attr)attributes.item(i);
if (attr.isId() && id.equals(attr.getValue()) && !knownElement.isSameNode(se)) {
LOG.log(Level.WARNING, "Multiple elements with the same 'Id' attribute value!");
return false;
}
}
}
}
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 true;
}
// close parent node processing (processed node now)
startNode = processedNode.getNextSibling();
}
}
return true;
}
/**
* Reads a document from the input stream.
*
* @param file
* @param disallowDocTypeDeclarations
* @return {@link Document}
* @throws XMLParserException
* @throws IOException
*/
public static Document read(File file, boolean disallowDocTypeDeclarations) throws XMLParserException, IOException {
try (InputStream inputStream = new BufferedInputStream(Files.newInputStream(file.toPath()), 8192)) {
return read(inputStream, disallowDocTypeDeclarations);
}
}
/**
* Reads a document from the input stream and closes it.
*
* @param name - resource name to be opened by the class loader
* @param loader
* @param disallowDocTypeDeclarations
* @return {@link Document}
* @throws XMLParserException
* @throws IOException inputStream.close() failed.
*/
public static Document readResource(String name, ClassLoader loader, boolean disallowDocTypeDeclarations)
throws XMLParserException, IOException {
// Delegate to XMLParser implementation
try (InputStream inputStream = loader.getResourceAsStream(name)) {
return read(inputStream, disallowDocTypeDeclarations);
}
}
/**
* Reads a document from the input stream.
* Caller is responsible for closing the stream.
*
* @param inputStream
* @param disallowDocTypeDeclarations
* @return {@link Document}
* @throws XMLParserException
*/
public static Document read(InputStream inputStream, boolean disallowDocTypeDeclarations) throws XMLParserException {
// Delegate to XMLParser implementation
return xmlParserImpl.parse(inputStream, disallowDocTypeDeclarations);
}
/**
* Returns a byte-array representation of a {@link BigInteger}.
* No sign-bit is output.
*
* N.B.: {@link BigInteger}'s toByteArray
* returns eventually longer arrays because of the leading sign-bit.
*
* @param big BigInteger to be converted
* @param bitlen int the desired length in bits of the representation
* @return a byte array with bitlen bits of big
*/
public static byte[] getBytes(BigInteger big, int bitlen) {
//round bitlen
bitlen = ((bitlen + 7) >> 3) << 3;
if (bitlen < big.bitLength()) {
throw new IllegalArgumentException(I18n.translate("utils.Base64.IllegalBitlength"));
}
byte[] bigBytes = big.toByteArray();
if (big.bitLength() % 8 != 0
&& big.bitLength() / 8 + 1 == bitlen / 8) {
return bigBytes;
}
// some copying needed
int startSrc = 0; // no need to skip anything
int bigLen = bigBytes.length; //valid length of the string
if (big.bitLength() % 8 == 0) { // correct values
startSrc = 1; // skip sign bit
bigLen--; // valid length of the string
}
int startDst = bitlen / 8 - bigLen; //pad with leading nulls
byte[] resizedBytes = new byte[bitlen / 8];
System.arraycopy(bigBytes, startSrc, resizedBytes, startDst, bigLen);
return resizedBytes;
}
}
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