HDFS-16795. Use secure XML parsers (#4979)

Move construction of XML parsers in HDFS
modules to using the locked-down parser factory
of HADOOP-18469.

Contributed by P J Fanning

hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/util/ECPolicyLoader.java

@@ -20,6 +20,8 @@
 import org.apache.hadoop.io.erasurecode.ECSchema;
 import org.apache.hadoop.classification.InterfaceAudience;
 import org.apache.hadoop.hdfs.protocol.ErasureCodingPolicy;
+import org.apache.hadoop.util.XMLUtils;
+
 import org.w3c.dom.Node;
 import org.w3c.dom.Text;
 import org.w3c.dom.Element;
@@ -87,13 +89,8 @@ private List<ErasureCodingPolicy> loadECPolicies(File policyFile)
     LOG.info("Loading EC policy file " + policyFile);
 
     // Read and parse the EC policy file.
-    DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
+    DocumentBuilderFactory dbf = XMLUtils.newSecureDocumentBuilderFactory();
     dbf.setIgnoringComments(true);
-    dbf.setFeature("http://apache.org/xml/features/disallow-doctype-decl", true);
-    dbf.setFeature("http://apache.org/xml/features/nonvalidating/load-external-dtd", false);
-    dbf.setFeature("http://xml.org/sax/features/external-general-entities", false);
-    dbf.setFeature("http://xml.org/sax/features/external-parameter-entities", false);
-    dbf.setFeature("http://apache.org/xml/features/dom/create-entity-ref-nodes", false);
     DocumentBuilder builder = dbf.newDocumentBuilder();
     Document doc = builder.parse(policyFile);
     Element root = doc.getDocumentElement();

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/tools/offlineEditsViewer/XmlEditsVisitor.java

@@ -60,8 +60,8 @@ public class XmlEditsVisitor implements OfflineEditsVisitor {
   public XmlEditsVisitor(OutputStream out)
       throws IOException {
     this.out = out;
-    factory =(SAXTransformerFactory)SAXTransformerFactory.newInstance();
     try {
+      factory = org.apache.hadoop.util.XMLUtils.newSecureSAXTransformerFactory();
       TransformerHandler handler = factory.newTransformerHandler();
       handler.getTransformer().setOutputProperty(OutputKeys.METHOD, "xml");
       handler.getTransformer().setOutputProperty(OutputKeys.ENCODING, "UTF-8");

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/tools/offlineImageViewer/OfflineImageReconstructor.java

@@ -17,7 +17,7 @@
  */
 package org.apache.hadoop.hdfs.tools.offlineImageViewer;
 
-import org.apache.hadoop.thirdparty.com.google.common.base.Preconditions;
+import org.apache.hadoop.util.Preconditions;
 import static org.apache.hadoop.hdfs.server.namenode.FSImageFormatPBINode.ACL_ENTRY_NAME_MASK;
 import static org.apache.hadoop.hdfs.server.namenode.FSImageFormatPBINode.ACL_ENTRY_NAME_OFFSET;
 import static org.apache.hadoop.hdfs.server.namenode.FSImageFormatPBINode.ACL_ENTRY_SCOPE_OFFSET;
@@ -56,6 +56,7 @@
 
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
+
 import org.apache.hadoop.classification.InterfaceAudience;
 import org.apache.hadoop.classification.InterfaceStability;
 import org.apache.hadoop.fs.permission.AclEntry;
@@ -147,6 +148,8 @@ private OfflineImageReconstructor(CountingOutputStream out,
       InputStreamReader reader) throws XMLStreamException {
     this.out = out;
     XMLInputFactory factory = XMLInputFactory.newInstance();
+    factory.setProperty(XMLInputFactory.SUPPORT_DTD, false);
+    factory.setProperty(XMLInputFactory.IS_SUPPORTING_EXTERNAL_ENTITIES, false);
     this.events = factory.createXMLEventReader(reader);
     this.sections = new HashMap<>();
     this.sections.put(NameSectionProcessor.NAME, new NameSectionProcessor());

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestEncryptionZones.java

@@ -103,6 +103,7 @@
 import org.apache.hadoop.crypto.key.KeyProviderDelegationTokenExtension.DelegationTokenExtension;
 import org.apache.hadoop.crypto.key.KeyProviderCryptoExtension.CryptoExtension;
 import org.apache.hadoop.io.Text;
+import org.apache.hadoop.util.XMLUtils;
 import org.apache.log4j.Level;
 import org.apache.log4j.Logger;
 import org.junit.After;
@@ -150,7 +151,6 @@
 import org.xml.sax.helpers.DefaultHandler;
 
 import javax.xml.parsers.SAXParser;
-import javax.xml.parsers.SAXParserFactory;
 
 public class TestEncryptionZones {
   static final Logger LOG = Logger.getLogger(TestEncryptionZones.class);
@@ -1731,7 +1731,7 @@ public void testOfflineImageViewerOnEncryptionZones() throws Exception {
     PBImageXmlWriter v = new PBImageXmlWriter(new Configuration(), pw);
     v.visit(new RandomAccessFile(originalFsimage, "r"));
     final String xml = output.toString();
-    SAXParser parser = SAXParserFactory.newInstance().newSAXParser();
+    SAXParser parser = XMLUtils.newSecureSAXParserFactory().newSAXParser();
     parser.parse(new InputSource(new StringReader(xml)), new DefaultHandler());
   }
 

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/tools/offlineImageViewer/TestOfflineImageViewer.java

@@ -122,6 +122,8 @@
 import org.apache.hadoop.security.token.Token;
 import org.apache.hadoop.test.GenericTestUtils;
 import org.apache.hadoop.test.LambdaTestUtils;
+import org.apache.hadoop.util.XMLUtils;
+
 import org.slf4j.event.Level;
 import org.junit.AfterClass;
 import org.junit.Assert;
@@ -558,7 +560,7 @@ public void testPBImageXmlWriter() throws IOException, SAXException,
     try (RandomAccessFile r = new RandomAccessFile(originalFsimage, "r")) {
       v.visit(r);
     }
-    SAXParserFactory spf = SAXParserFactory.newInstance();
+    SAXParserFactory spf = XMLUtils.newSecureSAXParserFactory();
     SAXParser parser = spf.newSAXParser();
     final String xml = output.toString();
     ECXMLHandler ecxmlHandler = new ECXMLHandler();
@@ -984,13 +986,13 @@ private void properINodeDelete(List<Long> idsToDelete, Document doc)
 
   private void deleteINodeFromXML(File inputFile, File outputFile,
       List<Long> corruptibleIds) throws Exception {
-    DocumentBuilderFactory docFactory = DocumentBuilderFactory.newInstance();
+    DocumentBuilderFactory docFactory = XMLUtils.newSecureDocumentBuilderFactory();
     DocumentBuilder docBuilder = docFactory.newDocumentBuilder();
     Document doc = docBuilder.parse(inputFile);
 
     properINodeDelete(corruptibleIds, doc);
 
-    TransformerFactory transformerFactory = TransformerFactory.newInstance();
+    TransformerFactory transformerFactory = XMLUtils.newSecureTransformerFactory();
     Transformer transformer = transformerFactory.newTransformer();
     DOMSource source = new DOMSource(doc);
     StreamResult result = new StreamResult(outputFile);
@@ -1323,10 +1325,9 @@ public void testOfflineImageViewerForECPolicies() throws Exception {
     v.visit(new RandomAccessFile(originalFsimage, "r"));
     final String xml = output.toString();
 
-    DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
+    DocumentBuilderFactory dbf = XMLUtils.newSecureDocumentBuilderFactory();
     DocumentBuilder db = dbf.newDocumentBuilder();
-    InputSource is = new InputSource();
+    InputSource is = new InputSource(new StringReader(xml));
-    is.setCharacterStream(new StringReader(xml));
     Document dom = db.parse(is);
     NodeList ecSection = dom.getElementsByTagName(ERASURE_CODING_SECTION_NAME);
     assertEquals(1, ecSection.getLength());

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/tools/offlineImageViewer/TestOfflineImageViewerForAcl.java

@@ -48,6 +48,8 @@
 import org.apache.hadoop.hdfs.server.namenode.FSImageTestUtil;
 import org.apache.hadoop.hdfs.web.WebHdfsFileSystem;
 import org.apache.hadoop.net.NetUtils;
+import org.apache.hadoop.util.XMLUtils;
+
 import org.junit.AfterClass;
 import org.junit.BeforeClass;
 import org.junit.Test;
@@ -220,7 +222,7 @@ public void testPBImageXmlWriterForAcl() throws Exception{
     PrintStream o = new PrintStream(output);
     PBImageXmlWriter v = new PBImageXmlWriter(new Configuration(), o);
     v.visit(new RandomAccessFile(originalFsimage, "r"));
-    SAXParserFactory spf = SAXParserFactory.newInstance();
+    SAXParserFactory spf = XMLUtils.newSecureSAXParserFactory();
     SAXParser parser = spf.newSAXParser();
     final String xml = output.toString();
     parser.parse(new InputSource(new StringReader(xml)), new DefaultHandler());