change to skip and remove macOS metadata and non-zip files

dependency-check-core/src/main/java/org/owasp/dependencycheck/analyzer/JarAnalyzer.java

@@ -19,12 +19,14 @@ package org.owasp.dependencycheck.analyzer;
 
 import java.io.File;
 import java.io.FileFilter;
+import java.io.FileInputStream;
 import java.io.FileOutputStream;
 import java.io.IOException;
 import java.io.InputStream;
 import java.io.InputStreamReader;
 import java.io.Reader;
 import java.io.UnsupportedEncodingException;
+import java.nio.file.Paths;
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.Enumeration;
@@ -42,6 +44,7 @@ import java.util.jar.JarFile;
 import java.util.jar.Manifest;
 import java.util.regex.Pattern;
 import java.util.zip.ZipEntry;
+
 import org.apache.commons.compress.utils.IOUtils;
 import org.apache.commons.io.FilenameUtils;
 import org.apache.commons.lang3.StringUtils;
@@ -53,11 +56,11 @@ import org.owasp.dependencycheck.dependency.Dependency;
 import org.owasp.dependencycheck.dependency.EvidenceCollection;
 import org.owasp.dependencycheck.exception.InitializationException;
 import org.owasp.dependencycheck.utils.FileFilterBuilder;
-import org.owasp.dependencycheck.xml.pom.License;
-import org.owasp.dependencycheck.xml.pom.PomUtils;
-import org.owasp.dependencycheck.xml.pom.Model;
 import org.owasp.dependencycheck.utils.FileUtils;
 import org.owasp.dependencycheck.utils.Settings;
+import org.owasp.dependencycheck.xml.pom.License;
+import org.owasp.dependencycheck.xml.pom.Model;
+import org.owasp.dependencycheck.xml.pom.PomUtils;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
@@ -168,6 +171,21 @@ public class JarAnalyzer extends AbstractFileTypeAnalyzer {
      */
     private static final FileFilter FILTER = FileFilterBuilder.newInstance().addExtensions(EXTENSIONS).build();
 
+    /**
+     * The expected first bytes when reading a zip file.
+     */
+    private static final byte[] ZIP_FIRST_BYTES = new byte[]{0x50, 0x4B, 0x03, 0x04};
+
+    /**
+     * The expected first bytes when reading an empty zip file.
+     */
+    private static final byte[] ZIP_EMPTY_FIRST_BYTES = new byte[]{0x50, 0x4B, 0x05, 0x06};
+
+    /**
+     * The expected first bytes when reading a spanned zip file.
+     */
+    private static final byte[] ZIP_SPANNED_FIRST_BYTES = new byte[]{0x50, 0x4B, 0x07, 0x08};
+
     //</editor-fold>
     //<editor-fold defaultstate="collapsed" desc="All standard implmentation details of Analyzer">
     /**
@@ -223,19 +241,82 @@ public class JarAnalyzer extends AbstractFileTypeAnalyzer {
      */
     @Override
     public void analyzeDependency(Dependency dependency, Engine engine) throws AnalysisException {
+        try {
             final List<ClassNameInformation> classNames = collectClassNames(dependency);
             final String fileName = dependency.getFileName().toLowerCase();
             if (classNames.isEmpty()
                     && (fileName.endsWith("-sources.jar")
                     || fileName.endsWith("-javadoc.jar")
                     || fileName.endsWith("-src.jar")
-            || fileName.endsWith("-doc.jar"))) {
+                    || fileName.endsWith("-doc.jar")
+                    || isMacOSMetaDataFile(dependency, engine))
+                    || !isZipFile(dependency)) {
                 engine.getDependencies().remove(dependency);
+                return;
             }
             final boolean hasManifest = parseManifest(dependency, classNames);
             final boolean hasPOM = analyzePOM(dependency, classNames, engine);
             final boolean addPackagesAsEvidence = !(hasManifest && hasPOM);
             analyzePackageNames(classNames, dependency, addPackagesAsEvidence);
+        } catch (IOException ex) {
+            throw new AnalysisException("Exception occurred reading the JAR file (" + dependency.getFileName() + ").", ex);
+        }
+    }
+
+    /**
+     * Checks if the given dependency appears to be a macOS metadata file, returning true if its filename starts with a
+     * ._ prefix and if there is another dependency with the same filename minus the ._ prefix, otherwise it returns
+     * false.
+     *
+     * @param dependency the dependency to check if it's a macOS metadata file
+     * @param engine     the engine that is scanning the dependencies
+     * @return whether or not the given dependency appears to be a macOS metadata file
+     */
+    private boolean isMacOSMetaDataFile(final Dependency dependency, final Engine engine) {
+        final String fileName = Paths.get(dependency.getActualFilePath()).getFileName().toString();
+        return fileName.startsWith("._") && hasDependencyWithFilename(engine.getDependencies(), fileName.substring(2));
+    }
+
+    /**
+     * Iterates through the given list of dependencies and returns true when it finds a dependency with a filename
+     * matching the given filename, otherwise returns false.
+     *
+     * @param dependencies the dependencies to search within
+     * @param fileName     the filename to search for
+     * @return whether or not the given dependencies contain a dependency with the given filename
+     */
+    private boolean hasDependencyWithFilename(final List<Dependency> dependencies, final String fileName) {
+        for (final Dependency dependency : dependencies) {
+            if (Paths.get(dependency.getActualFilePath()).getFileName().toString().toLowerCase()
+                .equals(fileName.toLowerCase())) {
+                return true;
+            }
+        }
+        return false;
+    }
+
+    /**
+     * Attempts to read the first bytes of the given dependency (using its actual file path) and returns true if they
+     * match the expected first bytes of a zip file, which may be empty or spanned. If they don't match, or if the file
+     * could not be read, then it returns false.
+     *
+     * @param dependency the dependency to check if it's a zip file
+     * @return whether or not the given dependency appears to be a zip file from its first bytes
+     */
+    private boolean isZipFile(final Dependency dependency) {
+        final byte[] buffer = new byte[4];
+        try (final FileInputStream fileInputStream = new FileInputStream(dependency.getActualFilePath())) {
+            fileInputStream.read(buffer);
+            if (Arrays.equals(buffer, ZIP_FIRST_BYTES) || Arrays.equals(buffer, ZIP_EMPTY_FIRST_BYTES) ||
+                Arrays.equals(buffer, ZIP_SPANNED_FIRST_BYTES)) {
+                return true;
+            }
+        }
+        catch (Exception e) {
+            LOGGER.warn("Unable to check if '{}' is a zip file", dependency.getActualFilePath());
+            LOGGER.trace("", e);
+        }
+        return false;
     }
 
     /**
@@ -583,8 +664,10 @@ public class JarAnalyzer extends AbstractFileTypeAnalyzer {
      * @param dependency A reference to the dependency
      * @param classInformation a collection of class information
      * @return whether evidence was identified parsing the manifest
+     * @throws IOException if there is an issue reading the JAR file
      */
-    protected boolean parseManifest(Dependency dependency, List<ClassNameInformation> classInformation) {
+    protected boolean parseManifest(Dependency dependency, List<ClassNameInformation> classInformation)
+            throws IOException {
         boolean foundSomething = false;
         try (JarFile jar = new JarFile(dependency.getActualFilePath())) {
             final Manifest manifest = jar.getManifest();
@@ -741,9 +824,6 @@ public class JarAnalyzer extends AbstractFileTypeAnalyzer {
                 foundSomething = true;
                 versionEvidence.addEvidence(source, "specification-version", specificationVersion, Confidence.HIGH);
             }
-        } catch (IOException ex) {
-            LOGGER.warn("Unable to read dependency file '{}'", dependency.getActualFilePath());
-            LOGGER.trace("", ex);
         }
         return foundSomething;
     }

dependency-check-core/src/test/java/org/owasp/dependencycheck/analyzer/JarAnalyzerTest.java

@@ -20,17 +20,18 @@ package org.owasp.dependencycheck.analyzer;
 import java.io.File;
 import java.util.ArrayList;
 import java.util.Arrays;
+import java.util.Collections;
 import java.util.List;
 
+import org.apache.commons.io.FileUtils;
 import org.junit.Test;
 import org.owasp.dependencycheck.BaseTest;
-import org.owasp.dependencycheck.analyzer.JarAnalyzer.ClassNameInformation;
+import org.owasp.dependencycheck.Engine;
 import org.owasp.dependencycheck.dependency.Dependency;
 import org.owasp.dependencycheck.dependency.Evidence;
 import org.owasp.dependencycheck.utils.Settings;
 
 import static org.junit.Assert.assertEquals;
-import static org.junit.Assert.assertFalse;
 import static org.junit.Assert.assertTrue;
 
 /**
@@ -176,10 +177,29 @@ public class JarAnalyzerTest extends BaseTest {
     }
 
     @Test
-    public void testParseManifest_CatchesIOException() {
+    public void testAnalyzeDependency_SkipsMacOSMetaDataFile() throws Exception {
-        Dependency dependency = new Dependency();
+        JarAnalyzer instance = new JarAnalyzer();
-        dependency.setActualFilePath("doesNotExist");
+        Dependency macOSMetaDataFile = new Dependency();
-        assertFalse(new File(dependency.getActualFilePath()).exists());
+        macOSMetaDataFile
-        assertFalse(new JarAnalyzer().parseManifest(dependency, new ArrayList<ClassNameInformation>()));
+            .setActualFilePath(FileUtils.getFile("src", "test", "resources", "._avro-ipc-1.5.0.jar").getAbsolutePath());
+        macOSMetaDataFile.setFileName("._avro-ipc-1.5.0.jar");
+        Dependency actualJarFile = new Dependency();
+        actualJarFile.setActualFilePath(BaseTest.getResourceAsFile(this, "avro-ipc-1.5.0.jar").getAbsolutePath());
+        actualJarFile.setFileName("avro-ipc-1.5.0.jar");
+        Engine engine = new Engine();
+        engine.setDependencies(Arrays.asList(macOSMetaDataFile, actualJarFile));
+        instance.analyzeDependency(macOSMetaDataFile, engine);
+    }
+
+    @Test
+    public void testAnalyseDependency_SkipsNonZipFile() throws Exception {
+        JarAnalyzer instance = new JarAnalyzer();
+        Dependency textFileWithJarExtension = new Dependency();
+        textFileWithJarExtension
+            .setActualFilePath(BaseTest.getResourceAsFile(this, "textFileWithJarExtension.jar").getAbsolutePath());
+        textFileWithJarExtension.setFileName("textFileWithJarExtension.jar");
+        Engine engine = new Engine();
+        engine.setDependencies(Collections.singletonList(textFileWithJarExtension));
+        instance.analyzeDependency(textFileWithJarExtension, engine);
     }
 }

dependency-check-core/src/test/resources/textFileWithJarExtension.jar

@@ -0,0 +1 @@
+text file with jar extension