File dom4j-CVE-2020-10683.patch of Package dom4j

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File dom4j-CVE-2020-10683.patch of Package dom4j (Revision 13dee6f8c4214a78f45ed5aca9f24eb4)

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From a8228522a99a02146106672a34c104adbda5c658 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Filip=20Jirs=C3=A1k?= <filip@jirsak.org>
Date: Sat, 11 Apr 2020 19:06:44 +0200
Subject: [PATCH] SAXReader uses system default XMLReader with its defaults.
 New factory method SAXReader.createDefault() sets more secure defaults.

---
 src/java/org/dom4j/DocumentHelper.java |   65 +-
 src/java/org/dom4j/io/SAXHelper.java   |   37 +-
 src/java/org/dom4j/io/SAXReader.java   | 1824 ++++++++++---------
 3 files changed, 973 insertions(+), 953 deletions(-)

Index: dom4j/src/java/org/dom4j/io/SAXHelper.java
===================================================================
--- dom4j.orig/src/java/org/dom4j/io/SAXHelper.java
+++ dom4j/src/java/org/dom4j/io/SAXHelper.java
@@ -13,6 +13,8 @@ import org.xml.sax.SAXNotSupportedExcept
 import org.xml.sax.XMLReader;
 import org.xml.sax.helpers.XMLReaderFactory;
 
+import javax.xml.parsers.SAXParserFactory;
+
 /**
 * 
 * <code>SAXHelper</code> contains some helper methods for working with SAX
@@ -59,9 +61,18 @@ class SAXHelper {
 }
 
 /**
- * Creats a default XMLReader via the org.xml.sax.driver system property or
+ * Creates a default XMLReader via the org.xml.sax.driver system property or
 * JAXP if the system property is not set.
 * 
+ * This method internally calls {@link SAXParserFactory}{@code .newInstance().newSAXParser().getXMLReader()} or {@link XMLReaderFactory#createXMLReader()}.
+ * Be sure to configure returned reader if the default configuration does not suit you. Consider setting the following properties:
+ *
+ * <pre>
+ * reader.setFeature("http://apache.org/xml/features/nonvalidating/load-external-dtd", false);
+ * reader.setFeature("http://xml.org/sax/features/external-general-entities", false);
+ * reader.setFeature("http://xml.org/sax/features/external-parameter-entities", false);
+ * </pre>
+ *
 * @param validating
 * DOCUMENT ME!
 * 
Index: dom4j/src/java/org/dom4j/io/SAXReader.java
===================================================================
--- dom4j.orig/src/java/org/dom4j/io/SAXReader.java
+++ dom4j/src/java/org/dom4j/io/SAXReader.java
@@ -30,6 +30,8 @@ import org.xml.sax.XMLReader;
 import org.xml.sax.helpers.DefaultHandler;
 import org.xml.sax.helpers.XMLReaderFactory;
 
+import javax.xml.parsers.SAXParserFactory;
+
 /**
 * 
 * <code>SAXReader</code> creates a DOM4J tree from SAX parsing events.
@@ -135,17 +137,76 @@ public class SAXReader {
 /** The SAX filter used to filter SAX events */
 private XMLFilter xmlFilter;
 
+ public static SAXReader createDefault() {
+ SAXReader reader = new SAXReader();
+ try {
+ reader.setFeature("http://apache.org/xml/features/nonvalidating/load-external-dtd", false);
+ reader.setFeature("http://xml.org/sax/features/external-general-entities", false);
+ reader.setFeature("http://xml.org/sax/features/external-parameter-entities", false);
+ } catch (SAXException e) {
+ // nothing to do, incompatible reader
+ }
+ return reader;
+ }
+
+ /**
+ * This method internally calls {@link SAXParserFactory}{@code .newInstance().newSAXParser().getXMLReader()} or {@link XMLReaderFactory#createXMLReader()}.
+ * Be sure to configure returned reader if the default configuration does not suit you. Consider setting the following properties:
+ *
+ * <pre>
+ * reader.setFeature("http://apache.org/xml/features/nonvalidating/load-external-dtd", false);
+ * reader.setFeature("http://xml.org/sax/features/external-general-entities", false);
+ * reader.setFeature("http://xml.org/sax/features/external-parameter-entities", false);
+ * </pre>
+ */
 public SAXReader() {
 }
 
+ /**
+ * This method internally calls {@link SAXParserFactory}{@code .newInstance().newSAXParser().getXMLReader()} or {@link XMLReaderFactory#createXMLReader()}.
+ * Be sure to configure returned reader if the default configuration does not suit you. Consider setting the following properties:
+ *
+ * <pre>
+ * reader.setFeature("http://apache.org/xml/features/nonvalidating/load-external-dtd", false);
+ * reader.setFeature("http://xml.org/sax/features/external-general-entities", false);
+ * reader.setFeature("http://xml.org/sax/features/external-parameter-entities", false);
+ * </pre>
+ *
+ * @param validating
+ */
 public SAXReader(boolean validating) {
 this.validating = validating;
 }
 
+ /**
+ * This method internally calls {@link SAXParserFactory}{@code .newInstance().newSAXParser().getXMLReader()} or {@link XMLReaderFactory#createXMLReader()}.
+ * Be sure to configure returned reader if the default configuration does not suit you. Consider setting the following properties:
+ *
+ * <pre>
+ * reader.setFeature("http://apache.org/xml/features/nonvalidating/load-external-dtd", false);
+ * reader.setFeature("http://xml.org/sax/features/external-general-entities", false);
+ * reader.setFeature("http://xml.org/sax/features/external-parameter-entities", false);
+ * </pre>
+ *
+ * @param factory
+ */
 public SAXReader(DocumentFactory factory) {
 this.factory = factory;
 }
 
+ /**
+ * This method internally calls {@link SAXParserFactory}{@code .newInstance().newSAXParser().getXMLReader()} or {@link XMLReaderFactory#createXMLReader()}.
+ * Be sure to configure returned reader if the default configuration does not suit you. Consider setting the following properties:
+ *
+ * <pre>
+ * reader.setFeature("http://apache.org/xml/features/nonvalidating/load-external-dtd", false);
+ * reader.setFeature("http://xml.org/sax/features/external-general-entities", false);
+ * reader.setFeature("http://xml.org/sax/features/external-parameter-entities", false);
+ * </pre>
+ *
+ * @param factory
+ * @param validating
+ */
 public SAXReader(DocumentFactory factory, boolean validating) {
 this.factory = factory;
 this.validating = validating;
@@ -185,14 +246,10 @@ public class SAXReader {
 * this method is to correctly configure an XMLReader object instance and
 * call the {@link #setXMLReader(XMLReader)}method
 * 
- * @param name
- * is the SAX property name
- * @param value
- * is the value of the SAX property
- * 
- * @throws SAXException
- * if the XMLReader could not be created or the property could
- * not be changed.
+ * @param name is the SAX property name
+ * @param value is the value of the SAX property
+ * @throws SAXException if the XMLReader could not be created or the property could
+ * not be changed.
 */
 public void setProperty(String name, Object value) throws SAXException {
 getXMLReader().setProperty(name, value);
@@ -205,14 +262,10 @@ public class SAXReader {
 * calling this method is to correctly configure an XMLReader object
 * instance and call the {@link #setXMLReader(XMLReader)}method
 * 
- * @param name
- * is the SAX feature name
- * @param value
- * is the value of the SAX feature
- * 
- * @throws SAXException
- * if the XMLReader could not be created or the feature could
- * not be changed.
+ * @param name is the SAX feature name
+ * @param value is the value of the SAX feature
+ * @throws SAXException if the XMLReader could not be created or the feature could
+ * not be changed.
 */
 public void setFeature(String name, boolean value) throws SAXException {
 getXMLReader().setFeature(name, value);
@@ -223,13 +276,9 @@ public class SAXReader {
 * Reads a Document from the given <code>File</code>
 * 
 * 
- * @param file
- * is the <code>File</code> to read from.
- * 
+ * @param file is the <code>File</code> to read from.
 * @return the newly created Document instance
- * 
- * @throws DocumentException
- * if an error occurs during parsing.
+ * @throws DocumentException if an error occurs during parsing.
 */
 public Document read(File file) throws DocumentException {
 try {
@@ -272,13 +321,9 @@ public class SAXReader {
 * Reads a Document from the given <code>URL</code> using SAX
 * 
 * 
- * @param url
- * <code>URL</code> to read from.
- * 
+ * @param url <code>URL</code> to read from.
 * @return the newly created Document instance
- * 
- * @throws DocumentException
- * if an error occurs during parsing.
+ * @throws DocumentException if an error occurs during parsing.
 */
 public Document read(URL url) throws DocumentException {
 String systemID = url.toExternalForm();
@@ -304,13 +349,9 @@ public class SAXReader {
 * String} to denote the source of the document.
 * 
 * 
- * @param systemId
- * is a URL for a document or a file name.
- * 
+ * @param systemId is a URL for a document or a file name.
 * @return the newly created Document instance
- * 
- * @throws DocumentException
- * if an error occurs during parsing.
+ * @throws DocumentException if an error occurs during parsing.
 */
 public Document read(String systemId) throws DocumentException {
 InputSource source = new InputSource(systemId);
@@ -326,13 +367,9 @@ public class SAXReader {
 * Reads a Document from the given stream using SAX
 * 
 * 
- * @param in
- * <code>InputStream</code> to read from.
- * 
+ * @param in <code>InputStream</code> to read from.
 * @return the newly created Document instance
- * 
- * @throws DocumentException
- * if an error occurs during parsing.
+ * @throws DocumentException if an error occurs during parsing.
 */
 public Document read(InputStream in) throws DocumentException {
 InputSource source = new InputSource(in);
@@ -348,13 +385,9 @@ public class SAXReader {
 * Reads a Document from the given <code>Reader</code> using SAX
 * 
 * 
- * @param reader
- * is the reader for the input
- * 
+ * @param reader is the reader for the input
 * @return the newly created Document instance
- * 
- * @throws DocumentException
- * if an error occurs during parsing.
+ * @throws DocumentException if an error occurs during parsing.
 */
 public Document read(Reader reader) throws DocumentException {
 InputSource source = new InputSource(reader);
@@ -370,15 +403,10 @@ public class SAXReader {
 * Reads a Document from the given stream using SAX
 * 
 * 
- * @param in
- * <code>InputStream</code> to read from.
- * @param systemId
- * is the URI for the input
- * 
+ * @param in <code>InputStream</code> to read from.
+ * @param systemId is the URI for the input
 * @return the newly created Document instance
- * 
- * @throws DocumentException
- * if an error occurs during parsing.
+ * @throws DocumentException if an error occurs during parsing.
 */
 public Document read(InputStream in, String systemId)
 throws DocumentException {
@@ -396,13 +424,9 @@ public class SAXReader {
 * Reads a Document from the given <code>Reader</code> using SAX
 * 
 * 
- * @param reader
- * is the reader for the input
- * @param systemId
- * is the URI for the input
- * 
+ * @param reader is the reader for the input
+ * @param systemId is the URI for the input
 * @return the newly created Document instance
- * 
 * @throws DocumentException
 * if an error occurs during parsing.
 */
@@ -422,13 +446,9 @@ public class SAXReader {
 * Reads a Document from the given <code>InputSource</code> using SAX
 * 
 * 
- * @param in
- * <code>InputSource</code> to read from.
- * 
+ * @param in <code>InputSource</code> to read from.
 * @return the newly created Document instance
- * 
- * @throws DocumentException
- * if an error occurs during parsing.
+ * @throws DocumentException if an error occurs during parsing.
 */
 public Document read(InputSource in) throws DocumentException {
 try {
@@ -695,8 +715,7 @@ public class SAXReader {
 /**
 * Sets the entity resolver used to resolve entities.
 * 
- * @param entityResolver
- * DOCUMENT ME!
+ * @param entityResolver DOCUMENT ME!
 */
 public void setEntityResolver(EntityResolver entityResolver) {
 this.entityResolver = entityResolver;
@@ -706,9 +725,7 @@ public class SAXReader {
 * DOCUMENT ME!
 * 
 * @return the <code>XMLReader</code> used to parse SAX events
- * 
- * @throws SAXException
- * DOCUMENT ME!
+ * @throws SAXException DOCUMENT ME!
 */
 public XMLReader getXMLReader() throws SAXException {
 if (xmlReader == null) {
@@ -721,8 +738,7 @@ public class SAXReader {
 /**
 * Sets the <code>XMLReader</code> used to parse SAX events
 * 
- * @param reader
- * is the <code>XMLReader</code> to parse SAX events
+ * @param reader is the <code>XMLReader</code> to parse SAX events
 */
 public void setXMLReader(XMLReader reader) {
 this.xmlReader = reader;
@@ -742,8 +758,7 @@ public class SAXReader {
 /**
 * Sets encoding used for InputSource (null means system default encoding)
 * 
- * @param encoding
- * is encoding used for InputSource
+ * @param encoding is encoding used for InputSource
 */
 public void setEncoding(String encoding) {
 this.encoding = encoding;
@@ -753,12 +768,9 @@ public class SAXReader {
 * Sets the class name of the <code>XMLReader</code> to be used to parse
 * SAX events.
 * 
- * @param xmlReaderClassName
- * is the class name of the <code>XMLReader</code> to parse SAX
- * events
- * 
- * @throws SAXException
- * DOCUMENT ME!
+ * @param xmlReaderClassName is the class name of the <code>XMLReader</code>
+ * to parse SAX events
+ * @throws SAXException DOCUMENT ME!
 */
 public void setXMLReaderClassName(String xmlReaderClassName)
 throws SAXException {
@@ -769,11 +781,9 @@ public class SAXReader {
 * Adds the <code>ElementHandler</code> to be called when the specified
 * path is encounted.
 * 
- * @param path
- * is the path to be handled
- * @param handler
- * is the <code>ElementHandler</code> to be called by the event
- * based processor.
+ * @param path is the path to be handled
+ * @param handler is the <code>ElementHandler</code> to be called by the event
+ * based processor.
 */
 public void addHandler(String path, ElementHandler handler) {
 getDispatchHandler().addHandler(path, handler);
@@ -783,8 +793,7 @@ public class SAXReader {
 * Removes the <code>ElementHandler</code> from the event based processor,
 * for the specified path.
 * 
- * @param path
- * is the path to remove the <code>ElementHandler</code> for.
+ * @param path is the path to remove the <code>ElementHandler</code> for.
 */
 public void removeHandler(String path) {
 getDispatchHandler().removeHandler(path);
@@ -795,9 +804,8 @@ public class SAXReader {
 * registered, this will set a default <code>ElementHandler</code> to be
 * called for any path which does NOT have a handler registered.
 * 
- * @param handler
- * is the <code>ElementHandler</code> to be called by the event
- * based processor.
+ * @param handler is the <code>ElementHandler</code> to be called by the event
+ * based processor.
 */
 public void setDefaultHandler(ElementHandler handler) {
 getDispatchHandler().setDefaultHandler(handler);
@@ -824,8 +832,7 @@ public class SAXReader {
 /**
 * Sets the SAX filter to be used when filtering SAX events
 * 
- * @param filter
- * is the SAX filter to use or null to disable filtering
+ * @param filter is the SAX filter to use or null to disable filtering
 */
 public void setXMLFilter(XMLFilter filter) {
 this.xmlFilter = filter;
@@ -838,9 +845,7 @@ public class SAXReader {
 * Installs any XMLFilter objects required to allow the SAX event stream to
 * be filtered and preprocessed before it gets to dom4j.
 * 
- * @param reader
- * DOCUMENT ME!
- * 
+ * @param reader DOCUMENT ME!
 * @return the new XMLFilter if applicable or the original XMLReader if no
 * filter is being used.
 */
@@ -886,9 +891,7 @@ public class SAXReader {
 * XMLReader objects
 * 
 * @return DOCUMENT ME!
- * 
- * @throws SAXException
- * DOCUMENT ME!
+ * @throws SAXException DOCUMENT ME!
 */
 protected XMLReader createXMLReader() throws SAXException {
 return SAXHelper.createXMLReader(isValidating());
@@ -897,13 +900,9 @@ public class SAXReader {
 /**
 * Configures the XMLReader before use
 * 
- * @param reader
- * DOCUMENT ME!
- * @param handler
- * DOCUMENT ME!
- * 
- * @throws DocumentException
- * DOCUMENT ME!
+ * @param reader DOCUMENT ME!
+ * @param handler DOCUMENT ME!
+ * @throws DocumentException DOCUMENT ME!
 */
 protected void configureReader(XMLReader reader, DefaultHandler handler)
 throws DocumentException {
@@ -918,10 +917,11 @@ public class SAXReader {
 SAXHelper.setParserProperty(reader, SAX_DECL_HANDLER, handler);
 }
 
- // configure namespace support
- SAXHelper.setParserFeature(reader, SAX_NAMESPACES, true);
+ // // configure namespace support
+ // SAXHelper.setParserFeature(reader, SAX_NAMESPACES, true);
 
- SAXHelper.setParserFeature(reader, SAX_NAMESPACE_PREFIXES, false);
+	// string interning
+ // SAXHelper.setParserFeature(reader, SAX_NAMESPACE_PREFIXES, false);
 
 // string interning
 SAXHelper.setParserFeature(reader, SAX_STRING_INTERNING,
@@ -936,8 +936,8 @@ public class SAXReader {
 * includeExternalParameterEntities );
 */
 // use Locator2 if possible
- SAXHelper.setParserFeature(reader,
- "http://xml.org/sax/features/use-locator2", true);
+ // SAXHelper.setParserFeature(reader,
+ // "http://xml.org/sax/features/use-locator2", true);
 
 try {
 // configure validation support
@@ -960,9 +960,7 @@ public class SAXReader {
 /**
 * Factory Method to allow user derived SAXContentHandler objects to be used
 * 
- * @param reader
- * DOCUMENT ME!
- * 
+ * @param reader DOCUMENT ME!
 * @return DOCUMENT ME!
 */
 protected SAXContentHandler createContentHandler(XMLReader reader) {

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