1 /*
   2  * Copyright (c) 1997, 2016, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.  Oracle designates this
   8  * particular file as subject to the "Classpath" exception as provided
   9  * by Oracle in the LICENSE file that accompanied this code.
  10  *
  11  * This code is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 
  26 package java.util.jar;
  27 
  28 import jdk.internal.misc.SharedSecrets;
  29 import jdk.internal.misc.JavaUtilZipFileAccess;
  30 import sun.security.action.GetPropertyAction;
  31 import sun.security.util.ManifestEntryVerifier;
  32 import sun.security.util.SignatureFileVerifier;
  33 
  34 import java.io.ByteArrayInputStream;
  35 import java.io.EOFException;
  36 import java.io.File;
  37 import java.io.IOException;
  38 import java.io.InputStream;
  39 import java.lang.ref.SoftReference;
  40 import java.net.URL;
  41 import java.security.CodeSigner;
  42 import java.security.CodeSource;
  43 import java.security.cert.Certificate;
  44 import java.util.ArrayList;
  45 import java.util.Enumeration;
  46 import java.util.Iterator;
  47 import java.util.List;
  48 import java.util.Locale;
  49 import java.util.Map;
  50 import java.util.NoSuchElementException;
  51 import java.util.Objects;
  52 import java.util.Spliterator;
  53 import java.util.Spliterators;
  54 import java.util.stream.Collector;
  55 import java.util.stream.Stream;
  56 import java.util.stream.StreamSupport;
  57 import java.util.zip.ZipEntry;
  58 import java.util.zip.ZipException;
  59 import java.util.zip.ZipFile;
  60 
  61 /**
  62  * The {@code JarFile} class is used to read the contents of a jar file
  63  * from any file that can be opened with {@code java.io.RandomAccessFile}.
  64  * It extends the class {@code java.util.zip.ZipFile} with support
  65  * for reading an optional {@code Manifest} entry, and support for
  66  * processing multi-release jar files.  The {@code Manifest} can be used
  67  * to specify meta-information about the jar file and its entries.
  68  *
  69  * <p><a id="multirelease">A multi-release jar file</a> is a jar file that
  70  * contains a manifest with a main attribute named "Multi-Release",
  71  * a set of "base" entries, some of which are public classes with public
  72  * or protected methods that comprise the public interface of the jar file,
  73  * and a set of "versioned" entries contained in subdirectories of the
  74  * "META-INF/versions" directory.  The versioned entries are partitioned by the
  75  * major version of the Java platform.  A versioned entry, with a version
  76  * {@code n}, {@code 8 < n}, in the "META-INF/versions/{n}" directory overrides
  77  * the base entry as well as any entry with a version number {@code i} where
  78  * {@code 8 < i < n}.
  79  *
  80  * <p>By default, a {@code JarFile} for a multi-release jar file is configured
  81  * to process the multi-release jar file as if it were a plain (unversioned) jar
  82  * file, and as such an entry name is associated with at most one base entry.
  83  * The {@code JarFile} may be configured to process a multi-release jar file by
  84  * creating the {@code JarFile} with the
  85  * {@link JarFile#JarFile(File, boolean, int, Runtime.Version)} constructor.  The
  86  * {@code Runtime.Version} object sets a maximum version used when searching for
  87  * versioned entries.  When so configured, an entry name
  88  * can correspond with at most one base entry and zero or more versioned
  89  * entries. A search is required to associate the entry name with the latest
  90  * versioned entry whose version is less than or equal to the maximum version
  91  * (see {@link #getEntry(String)}).
  92  *
  93  * <p>Class loaders that utilize {@code JarFile} to load classes from the
  94  * contents of {@code JarFile} entries should construct the {@code JarFile}
  95  * by invoking the {@link JarFile#JarFile(File, boolean, int, Runtime.Version)}
  96  * constructor with the value {@code Runtime.version()} assigned to the last
  97  * argument.  This assures that classes compatible with the major
  98  * version of the running JVM are loaded from multi-release jar files.
  99  *
 100  * <p>If the verify flag is on when opening a signed jar file, the content of
 101  * the file is verified against its signature embedded inside the file. Please
 102  * note that the verification process does not include validating the signer's
 103  * certificate. A caller should inspect the return value of
 104  * {@link JarEntry#getCodeSigners()} to further determine if the signature
 105  * can be trusted.
 106  *
 107  * <p> Unless otherwise noted, passing a {@code null} argument to a constructor
 108  * or method in this class will cause a {@link NullPointerException} to be
 109  * thrown.
 110  *
 111  * @implNote
 112  * <div class="block">
 113  * If the API can not be used to configure a {@code JarFile} (e.g. to override
 114  * the configuration of a compiled application or library), two {@code System}
 115  * properties are available.
 116  * <ul>
 117  * <li>
 118  * {@code jdk.util.jar.version} can be assigned a value that is the
 119  * {@code String} representation of a non-negative integer
 120  * {@code <= Runtime.version().feature()}.  The value is used to set the effective
 121  * runtime version to something other than the default value obtained by
 122  * evaluating {@code Runtime.version().feature()}. The effective runtime version
 123  * is the version that the {@link JarFile#JarFile(File, boolean, int, Runtime.Version)}
 124  * constructor uses when the value of the last argument is
 125  * {@code JarFile.runtimeVersion()}.
 126  * </li>
 127  * <li>
 128  * {@code jdk.util.jar.enableMultiRelease} can be assigned one of the three
 129  * {@code String} values <em>true</em>, <em>false</em>, or <em>force</em>.  The
 130  * value <em>true</em>, the default value, enables multi-release jar file
 131  * processing.  The value <em>false</em> disables multi-release jar processing,
 132  * ignoring the "Multi-Release" manifest attribute, and the versioned
 133  * directories in a multi-release jar file if they exist.  Furthermore,
 134  * the method {@link JarFile#isMultiRelease()} returns <em>false</em>. The value
 135  * <em>force</em> causes the {@code JarFile} to be initialized to runtime
 136  * versioning after construction.  It effectively does the same as this code:
 137  * {@code (new JarFile(File, boolean, int, JarFile.runtimeVersion())}.
 138  * </li>
 139  * </ul>
 140  * </div>
 141  *
 142  * @author  David Connelly
 143  * @see     Manifest
 144  * @see     java.util.zip.ZipFile
 145  * @see     java.util.jar.JarEntry
 146  * @since   1.2
 147  */
 148 public
 149 class JarFile extends ZipFile {
 150     private final static Runtime.Version BASE_VERSION;
 151     private final static int BASE_VERSION_FEATURE;
 152     private final static Runtime.Version RUNTIME_VERSION;
 153     private final static boolean MULTI_RELEASE_ENABLED;
 154     private final static boolean MULTI_RELEASE_FORCED;
 155     private SoftReference<Manifest> manRef;
 156     private JarEntry manEntry;
 157     private JarVerifier jv;
 158     private boolean jvInitialized;
 159     private boolean verify;
 160     private final Runtime.Version version;  // current version
 161     private final int versionFeature;         // version.feature()
 162     private boolean isMultiRelease;         // is jar multi-release?
 163 
 164     // indicates if Class-Path attribute present
 165     private boolean hasClassPathAttribute;
 166     // true if manifest checked for special attributes
 167     private volatile boolean hasCheckedSpecialAttributes;
 168 
 169     private static final JavaUtilZipFileAccess JUZFA;
 170 
 171     static {
 172         // Set up JavaUtilJarAccess in SharedSecrets
 173         SharedSecrets.setJavaUtilJarAccess(new JavaUtilJarAccessImpl());
 174         // Get JavaUtilZipFileAccess from SharedSecrets
 175         JUZFA = jdk.internal.misc.SharedSecrets.getJavaUtilZipFileAccess();
 176         // multi-release jar file versions >= 9
 177         BASE_VERSION = Runtime.Version.parse(Integer.toString(8));
 178         BASE_VERSION_FEATURE = BASE_VERSION.feature();
 179         String jarVersion = GetPropertyAction.privilegedGetProperty("jdk.util.jar.version");
 180         int runtimeVersion = Runtime.version().feature();
 181         if (jarVersion != null) {
 182             int jarVer = Integer.parseInt(jarVersion);
 183             runtimeVersion = (jarVer > runtimeVersion)
 184                     ? runtimeVersion
 185                     : Math.max(jarVer, BASE_VERSION_FEATURE);
 186         }
 187         RUNTIME_VERSION = Runtime.Version.parse(Integer.toString(runtimeVersion));
 188         String enableMultiRelease = GetPropertyAction
 189                 .privilegedGetProperty("jdk.util.jar.enableMultiRelease", "true");
 190         switch (enableMultiRelease) {
 191             case "true":
 192             default:
 193                 MULTI_RELEASE_ENABLED = true;
 194                 MULTI_RELEASE_FORCED = false;
 195                 break;
 196             case "false":
 197                 MULTI_RELEASE_ENABLED = false;
 198                 MULTI_RELEASE_FORCED = false;
 199                 break;
 200             case "force":
 201                 MULTI_RELEASE_ENABLED = true;
 202                 MULTI_RELEASE_FORCED = true;
 203                 break;
 204         }
 205     }
 206 
 207     private static final String META_INF = "META-INF/";
 208 
 209     private static final String META_INF_VERSIONS = META_INF + "versions/";
 210 
 211     /**
 212      * The JAR manifest file name.
 213      */
 214     public static final String MANIFEST_NAME = META_INF + "MANIFEST.MF";
 215 
 216     /**
 217      * Returns the version that represents the unversioned configuration of a
 218      * multi-release jar file.
 219      *
 220      * @return the version that represents the unversioned configuration
 221      *
 222      * @since 9
 223      */
 224     public static Runtime.Version baseVersion() {
 225         return BASE_VERSION;
 226     }
 227 
 228     /**
 229      * Returns the version that represents the effective runtime versioned
 230      * configuration of a multi-release jar file.
 231      * <p>
 232      * By default the feature version number of the returned {@code Version} will
 233      * be equal to the feature version number of {@code Runtime.version()}.
 234      * However, if the {@code jdk.util.jar.version} property is set, the
 235      * returned {@code Version} is derived from that property and feature version
 236      * numbers may not be equal.
 237      *
 238      * @return the version that represents the runtime versioned configuration
 239      *
 240      * @since 9
 241      */
 242     public static Runtime.Version runtimeVersion() {
 243         return RUNTIME_VERSION;
 244     }
 245 
 246     /**
 247      * Creates a new {@code JarFile} to read from the specified
 248      * file {@code name}. The {@code JarFile} will be verified if
 249      * it is signed.
 250      * @param name the name of the jar file to be opened for reading
 251      * @throws IOException if an I/O error has occurred
 252      * @throws SecurityException if access to the file is denied
 253      *         by the SecurityManager
 254      */
 255     public JarFile(String name) throws IOException {
 256         this(new File(name), true, ZipFile.OPEN_READ);
 257     }
 258 
 259     /**
 260      * Creates a new {@code JarFile} to read from the specified
 261      * file {@code name}.
 262      * @param name the name of the jar file to be opened for reading
 263      * @param verify whether or not to verify the jar file if
 264      * it is signed.
 265      * @throws IOException if an I/O error has occurred
 266      * @throws SecurityException if access to the file is denied
 267      *         by the SecurityManager
 268      */
 269     public JarFile(String name, boolean verify) throws IOException {
 270         this(new File(name), verify, ZipFile.OPEN_READ);
 271     }
 272 
 273     /**
 274      * Creates a new {@code JarFile} to read from the specified
 275      * {@code File} object. The {@code JarFile} will be verified if
 276      * it is signed.
 277      * @param file the jar file to be opened for reading
 278      * @throws IOException if an I/O error has occurred
 279      * @throws SecurityException if access to the file is denied
 280      *         by the SecurityManager
 281      */
 282     public JarFile(File file) throws IOException {
 283         this(file, true, ZipFile.OPEN_READ);
 284     }
 285 
 286     /**
 287      * Creates a new {@code JarFile} to read from the specified
 288      * {@code File} object.
 289      * @param file the jar file to be opened for reading
 290      * @param verify whether or not to verify the jar file if
 291      * it is signed.
 292      * @throws IOException if an I/O error has occurred
 293      * @throws SecurityException if access to the file is denied
 294      *         by the SecurityManager.
 295      */
 296     public JarFile(File file, boolean verify) throws IOException {
 297         this(file, verify, ZipFile.OPEN_READ);
 298     }
 299 
 300     /**
 301      * Creates a new {@code JarFile} to read from the specified
 302      * {@code File} object in the specified mode.  The mode argument
 303      * must be either {@code OPEN_READ} or {@code OPEN_READ | OPEN_DELETE}.
 304      *
 305      * @param file the jar file to be opened for reading
 306      * @param verify whether or not to verify the jar file if
 307      * it is signed.
 308      * @param mode the mode in which the file is to be opened
 309      * @throws IOException if an I/O error has occurred
 310      * @throws IllegalArgumentException
 311      *         if the {@code mode} argument is invalid
 312      * @throws SecurityException if access to the file is denied
 313      *         by the SecurityManager
 314      * @since 1.3
 315      */
 316     public JarFile(File file, boolean verify, int mode) throws IOException {
 317         this(file, verify, mode, BASE_VERSION);
 318     }
 319 
 320     /**
 321      * Creates a new {@code JarFile} to read from the specified
 322      * {@code File} object in the specified mode.  The mode argument
 323      * must be either {@code OPEN_READ} or {@code OPEN_READ | OPEN_DELETE}.
 324      * The version argument, after being converted to a canonical form, is
 325      * used to configure the {@code JarFile} for processing
 326      * multi-release jar files.
 327      * <p>
 328      * The canonical form derived from the version parameter is
 329      * {@code Runtime.Version.parse(Integer.toString(n))} where {@code n} is
 330      * {@code Math.max(version.feature(), JarFile.baseVersion().feature())}.
 331      *
 332      * @param file the jar file to be opened for reading
 333      * @param verify whether or not to verify the jar file if
 334      * it is signed.
 335      * @param mode the mode in which the file is to be opened
 336      * @param version specifies the release version for a multi-release jar file
 337      * @throws IOException if an I/O error has occurred
 338      * @throws IllegalArgumentException
 339      *         if the {@code mode} argument is invalid
 340      * @throws SecurityException if access to the file is denied
 341      *         by the SecurityManager
 342      * @throws NullPointerException if {@code version} is {@code null}
 343      * @since 9
 344      */
 345     public JarFile(File file, boolean verify, int mode, Runtime.Version version) throws IOException {
 346         super(file, mode);
 347         this.verify = verify;
 348         Objects.requireNonNull(version);
 349         if (MULTI_RELEASE_FORCED || version.feature() == RUNTIME_VERSION.feature()) {
 350             // This deals with the common case where the value from JarFile.runtimeVersion() is passed
 351             this.version = RUNTIME_VERSION;
 352         } else if (version.feature() <= BASE_VERSION_FEATURE) {
 353             // This also deals with the common case where the value from JarFile.baseVersion() is passed
 354             this.version = BASE_VERSION;
 355         } else {
 356             // Canonicalize
 357             this.version = Runtime.Version.parse(Integer.toString(version.feature()));
 358         }
 359         this.versionFeature = this.version.feature();
 360     }
 361 
 362     /**
 363      * Returns the maximum version used when searching for versioned entries.
 364      * <p>
 365      * If this {@code JarFile} is not a multi-release jar file or is not
 366      * configured to be processed as such, then the version returned will be the
 367      * same as that returned from {@link #baseVersion()}.
 368      *
 369      * @return the maximum version
 370      * @since 9
 371      */
 372     public final Runtime.Version getVersion() {
 373         return isMultiRelease() ? this.version : BASE_VERSION;
 374     }
 375 
 376     /**
 377      * Indicates whether or not this jar file is a multi-release jar file.
 378      *
 379      * @return true if this JarFile is a multi-release jar file
 380      * @since 9
 381      */
 382     public final boolean isMultiRelease() {
 383         if (isMultiRelease) {
 384             return true;
 385         }
 386         if (MULTI_RELEASE_ENABLED) {
 387             try {
 388                 checkForSpecialAttributes();
 389             } catch (IOException io) {
 390                 isMultiRelease = false;
 391             }
 392         }
 393         return isMultiRelease;
 394     }
 395 
 396     /**
 397      * Returns the jar file manifest, or {@code null} if none.
 398      *
 399      * @return the jar file manifest, or {@code null} if none
 400      *
 401      * @throws IllegalStateException
 402      *         may be thrown if the jar file has been closed
 403      * @throws IOException  if an I/O error has occurred
 404      */
 405     public Manifest getManifest() throws IOException {
 406         return getManifestFromReference();
 407     }
 408 
 409     private Manifest getManifestFromReference() throws IOException {
 410         Manifest man = manRef != null ? manRef.get() : null;
 411 
 412         if (man == null) {
 413 
 414             JarEntry manEntry = getManEntry();
 415 
 416             // If found then load the manifest
 417             if (manEntry != null) {
 418                 if (verify) {
 419                     byte[] b = getBytes(manEntry);
 420                     man = new Manifest(new ByteArrayInputStream(b));
 421                     if (!jvInitialized) {
 422                         jv = new JarVerifier(b);
 423                     }
 424                 } else {
 425                     man = new Manifest(super.getInputStream(manEntry));
 426                 }
 427                 manRef = new SoftReference<>(man);
 428             }
 429         }
 430         return man;
 431     }
 432 
 433     private String[] getMetaInfEntryNames() {
 434         return JUZFA.getMetaInfEntryNames((ZipFile)this);
 435     }
 436 
 437     /**
 438      * Returns the {@code JarEntry} for the given base entry name or
 439      * {@code null} if not found.
 440      *
 441      * <p>If this {@code JarFile} is a multi-release jar file and is configured
 442      * to be processed as such, then a search is performed to find and return
 443      * a {@code JarEntry} that is the latest versioned entry associated with the
 444      * given entry name.  The returned {@code JarEntry} is the versioned entry
 445      * corresponding to the given base entry name prefixed with the string
 446      * {@code "META-INF/versions/{n}/"}, for the largest value of {@code n} for
 447      * which an entry exists.  If such a versioned entry does not exist, then
 448      * the {@code JarEntry} for the base entry is returned, otherwise
 449      * {@code null} is returned if no entries are found.  The initial value for
 450      * the version {@code n} is the maximum version as returned by the method
 451      * {@link JarFile#getVersion()}.
 452      *
 453      * @param name the jar file entry name
 454      * @return the {@code JarEntry} for the given entry name, or
 455      *         the versioned entry name, or {@code null} if not found
 456      *
 457      * @throws IllegalStateException
 458      *         may be thrown if the jar file has been closed
 459      *
 460      * @see java.util.jar.JarEntry
 461      *
 462      * @implSpec
 463      * <div class="block">
 464      * This implementation invokes {@link JarFile#getEntry(String)}.
 465      * </div>
 466      */
 467     public JarEntry getJarEntry(String name) {
 468         return (JarEntry)getEntry(name);
 469     }
 470 
 471     /**
 472      * Returns the {@code ZipEntry} for the given base entry name or
 473      * {@code null} if not found.
 474      *
 475      * <p>If this {@code JarFile} is a multi-release jar file and is configured
 476      * to be processed as such, then a search is performed to find and return
 477      * a {@code ZipEntry} that is the latest versioned entry associated with the
 478      * given entry name.  The returned {@code ZipEntry} is the versioned entry
 479      * corresponding to the given base entry name prefixed with the string
 480      * {@code "META-INF/versions/{n}/"}, for the largest value of {@code n} for
 481      * which an entry exists.  If such a versioned entry does not exist, then
 482      * the {@code ZipEntry} for the base entry is returned, otherwise
 483      * {@code null} is returned if no entries are found.  The initial value for
 484      * the version {@code n} is the maximum version as returned by the method
 485      * {@link JarFile#getVersion()}.
 486      *
 487      * @param name the jar file entry name
 488      * @return the {@code ZipEntry} for the given entry name or
 489      *         the versioned entry name or {@code null} if not found
 490      *
 491      * @throws IllegalStateException
 492      *         may be thrown if the jar file has been closed
 493      *
 494      * @see java.util.zip.ZipEntry
 495      *
 496      * @implSpec
 497      * <div class="block">
 498      * This implementation may return a versioned entry for the requested name
 499      * even if there is not a corresponding base entry.  This can occur
 500      * if there is a private or package-private versioned entry that matches.
 501      * If a subclass overrides this method, assure that the override method
 502      * invokes {@code super.getEntry(name)} to obtain all versioned entries.
 503      * </div>
 504      */
 505     public ZipEntry getEntry(String name) {
 506         JarFileEntry je = getEntry0(name);
 507         if (isMultiRelease()) {
 508             return getVersionedEntry(name, je);
 509         }
 510         return je;
 511     }
 512 
 513     /**
 514      * Returns an enumeration of the jar file entries.
 515      *
 516      * @return an enumeration of the jar file entries
 517      * @throws IllegalStateException
 518      *         may be thrown if the jar file has been closed
 519      */
 520     public Enumeration<JarEntry> entries() {
 521         return JUZFA.entries(this, JarFileEntry::new);
 522     }
 523 
 524     /**
 525      * Returns an ordered {@code Stream} over the jar file entries.
 526      * Entries appear in the {@code Stream} in the order they appear in
 527      * the central directory of the jar file.
 528      *
 529      * @return an ordered {@code Stream} of entries in this jar file
 530      * @throws IllegalStateException if the jar file has been closed
 531      * @since 1.8
 532      */
 533     public Stream<JarEntry> stream() {
 534         return JUZFA.stream(this, JarFileEntry::new);
 535     }
 536 
 537     /**
 538      * Returns a {@code Stream} of the versioned jar file entries.
 539      *
 540      * <p>If this {@code JarFile} is a multi-release jar file and is configured to
 541      * be processed as such, then an entry in the stream is the latest versioned entry
 542      * associated with the corresponding base entry name. The maximum version of the
 543      * latest versioned entry is the version returned by {@link #getVersion()}.
 544      * The returned stream may include an entry that only exists as a versioned entry.
 545      *
 546      * If the jar file is not a multi-release jar file or the {@code JarFile} is not
 547      * configured for processing a multi-release jar file, this method returns the
 548      * same stream that {@link #stream()} returns.
 549      *
 550      * @return stream of versioned entries
 551      * @since 10
 552      */
 553     public Stream<JarEntry> versionedStream() {
 554 
 555         if (isMultiRelease()) {
 556             return JUZFA.entryNameStream(this).map(this::getBasename)
 557                                               .filter(Objects::nonNull)
 558                                               .distinct()
 559                                               .map(this::getJarEntry);
 560         }
 561         return stream();
 562     }
 563 
 564     /*
 565      * Invokes {@ZipFile}'s getEntry to Return a {@code JarFileEntry} for the
 566      * given entry name or {@code null} if not found.
 567      */
 568     private JarFileEntry getEntry0(String name) {
 569         return (JarFileEntry)JUZFA.getEntry(this, name, JarFileEntry::new);
 570     }
 571 
 572     private String getBasename(String name) {
 573         if (name.startsWith(META_INF_VERSIONS)) {
 574             int off = META_INF_VERSIONS.length();
 575             int index = name.indexOf('/', off);
 576             try {
 577                 // filter out dir META-INF/versions/ and META-INF/versions/*/
 578                 // and any entry with version > 'version'
 579                 if (index == -1 || index == (name.length() - 1) ||
 580                     Integer.parseInt(name, off, index, 10) > versionFeature) {
 581                     return null;
 582                 }
 583             } catch (NumberFormatException x) {
 584                 return null; // remove malformed entries silently
 585             }
 586             // map to its base name
 587             return name.substring(index + 1);
 588         }
 589         return name;
 590     }
 591 
 592     private JarEntry getVersionedEntry(String name, JarEntry je) {
 593         if (BASE_VERSION_FEATURE < versionFeature) {
 594             if (!name.startsWith(META_INF)) {
 595                 // search for versioned entry
 596                 int v = versionFeature;
 597                 while (v > BASE_VERSION_FEATURE) {
 598                     JarFileEntry vje = getEntry0(META_INF_VERSIONS + v + "/" + name);
 599                     if (vje != null) {
 600                         return vje.withBasename(name);
 601                     }
 602                     v--;
 603                 }
 604             }
 605         }
 606         return je;
 607     }
 608 
 609     // placeholder for now
 610     String getRealName(JarEntry entry) {
 611         return entry.getRealName();
 612     }
 613 
 614     private class JarFileEntry extends JarEntry {
 615         private String basename;
 616 
 617         JarFileEntry(String name) {
 618             super(name);
 619             this.basename = name;
 620         }
 621 
 622         JarFileEntry(String name, ZipEntry vze) {
 623             super(vze);
 624             this.basename = name;
 625         }
 626 
 627         @Override
 628         public Attributes getAttributes() throws IOException {
 629             Manifest man = JarFile.this.getManifest();
 630             if (man != null) {
 631                 return man.getAttributes(super.getName());
 632             } else {
 633                 return null;
 634             }
 635         }
 636 
 637         @Override
 638         public Certificate[] getCertificates() {
 639             try {
 640                 maybeInstantiateVerifier();
 641             } catch (IOException e) {
 642                 throw new RuntimeException(e);
 643             }
 644             if (certs == null && jv != null) {
 645                 certs = jv.getCerts(JarFile.this, realEntry());
 646             }
 647             return certs == null ? null : certs.clone();
 648         }
 649 
 650         @Override
 651         public CodeSigner[] getCodeSigners() {
 652             try {
 653                 maybeInstantiateVerifier();
 654             } catch (IOException e) {
 655                 throw new RuntimeException(e);
 656             }
 657             if (signers == null && jv != null) {
 658                 signers = jv.getCodeSigners(JarFile.this, realEntry());
 659             }
 660             return signers == null ? null : signers.clone();
 661         }
 662 
 663         @Override
 664         public String getRealName() {
 665             return super.getName();
 666         }
 667 
 668         @Override
 669         public String getName() {
 670             return basename;
 671         }
 672 
 673         JarFileEntry realEntry() {
 674             if (isMultiRelease() && versionFeature != BASE_VERSION_FEATURE) {
 675                 String entryName = super.getName();
 676                 return entryName == basename || entryName.equals(basename) ?
 677                         this : new JarFileEntry(entryName, this);
 678             }
 679             return this;
 680         }
 681 
 682         // changes the basename, returns "this"
 683         JarFileEntry withBasename(String name) {
 684             basename = name;
 685             return this;
 686         }
 687     }
 688 
 689     /*
 690      * Ensures that the JarVerifier has been created if one is
 691      * necessary (i.e., the jar appears to be signed.) This is done as
 692      * a quick check to avoid processing of the manifest for unsigned
 693      * jars.
 694      */
 695     private void maybeInstantiateVerifier() throws IOException {
 696         if (jv != null) {
 697             return;
 698         }
 699 
 700         if (verify) {
 701             String[] names = getMetaInfEntryNames();
 702             if (names != null) {
 703                 for (String nameLower : names) {
 704                     String name = nameLower.toUpperCase(Locale.ENGLISH);
 705                     if (name.endsWith(".DSA") ||
 706                         name.endsWith(".RSA") ||
 707                         name.endsWith(".EC") ||
 708                         name.endsWith(".SF")) {
 709                         // Assume since we found a signature-related file
 710                         // that the jar is signed and that we therefore
 711                         // need a JarVerifier and Manifest
 712                         getManifest();
 713                         return;
 714                     }
 715                 }
 716             }
 717             // No signature-related files; don't instantiate a
 718             // verifier
 719             verify = false;
 720         }
 721     }
 722 
 723     /*
 724      * Initializes the verifier object by reading all the manifest
 725      * entries and passing them to the verifier.
 726      */
 727     private void initializeVerifier() {
 728         ManifestEntryVerifier mev = null;
 729 
 730         // Verify "META-INF/" entries...
 731         try {
 732             String[] names = getMetaInfEntryNames();
 733             if (names != null) {
 734                 for (String name : names) {
 735                     String uname = name.toUpperCase(Locale.ENGLISH);
 736                     if (MANIFEST_NAME.equals(uname)
 737                             || SignatureFileVerifier.isBlockOrSF(uname)) {
 738                         JarEntry e = getJarEntry(name);
 739                         if (e == null) {
 740                             throw new JarException("corrupted jar file");
 741                         }
 742                         if (mev == null) {
 743                             mev = new ManifestEntryVerifier
 744                                 (getManifestFromReference());
 745                         }
 746                         byte[] b = getBytes(e);
 747                         if (b != null && b.length > 0) {
 748                             jv.beginEntry(e, mev);
 749                             jv.update(b.length, b, 0, b.length, mev);
 750                             jv.update(-1, null, 0, 0, mev);
 751                         }
 752                     }
 753                 }
 754             }
 755         } catch (IOException ex) {
 756             // if we had an error parsing any blocks, just
 757             // treat the jar file as being unsigned
 758             jv = null;
 759             verify = false;
 760             if (JarVerifier.debug != null) {
 761                 JarVerifier.debug.println("jarfile parsing error!");
 762                 ex.printStackTrace();
 763             }
 764         }
 765 
 766         // if after initializing the verifier we have nothing
 767         // signed, we null it out.
 768 
 769         if (jv != null) {
 770 
 771             jv.doneWithMeta();
 772             if (JarVerifier.debug != null) {
 773                 JarVerifier.debug.println("done with meta!");
 774             }
 775 
 776             if (jv.nothingToVerify()) {
 777                 if (JarVerifier.debug != null) {
 778                     JarVerifier.debug.println("nothing to verify!");
 779                 }
 780                 jv = null;
 781                 verify = false;
 782             }
 783         }
 784     }
 785 
 786     /*
 787      * Reads all the bytes for a given entry. Used to process the
 788      * META-INF files.
 789      */
 790     private byte[] getBytes(ZipEntry ze) throws IOException {
 791         try (InputStream is = super.getInputStream(ze)) {
 792             int len = (int)ze.getSize();
 793             int bytesRead;
 794             byte[] b;
 795             // trust specified entry sizes when reasonably small
 796             if (len != -1 && len <= 65535) {
 797                 b = new byte[len];
 798                 bytesRead = is.readNBytes(b, 0, len);
 799             } else {
 800                 b = is.readAllBytes();
 801                 bytesRead = b.length;
 802             }
 803             if (len != -1 && len != bytesRead) {
 804                 throw new EOFException("Expected:" + len + ", read:" + bytesRead);
 805             }
 806             return b;
 807         }
 808     }
 809 
 810     /**
 811      * Returns an input stream for reading the contents of the specified
 812      * zip file entry.
 813      * @param ze the zip file entry
 814      * @return an input stream for reading the contents of the specified
 815      *         zip file entry
 816      * @throws ZipException if a zip file format error has occurred
 817      * @throws IOException if an I/O error has occurred
 818      * @throws SecurityException if any of the jar file entries
 819      *         are incorrectly signed.
 820      * @throws IllegalStateException
 821      *         may be thrown if the jar file has been closed
 822      */
 823     public synchronized InputStream getInputStream(ZipEntry ze)
 824         throws IOException
 825     {
 826         maybeInstantiateVerifier();
 827         if (jv == null) {
 828             return super.getInputStream(ze);
 829         }
 830         if (!jvInitialized) {
 831             initializeVerifier();
 832             jvInitialized = true;
 833             // could be set to null after a call to
 834             // initializeVerifier if we have nothing to
 835             // verify
 836             if (jv == null)
 837                 return super.getInputStream(ze);
 838         }
 839 
 840         // wrap a verifier stream around the real stream
 841         return new JarVerifier.VerifierStream(
 842             getManifestFromReference(),
 843             verifiableEntry(ze),
 844             super.getInputStream(ze),
 845             jv);
 846     }
 847 
 848     private JarEntry verifiableEntry(ZipEntry ze) {
 849         if (ze instanceof JarFileEntry) {
 850             // assure the name and entry match for verification
 851             return ((JarFileEntry)ze).realEntry();
 852         }
 853         ze = getJarEntry(ze.getName());
 854         if (ze instanceof JarFileEntry) {
 855             return ((JarFileEntry)ze).realEntry();
 856         }
 857         return (JarEntry)ze;
 858     }
 859 
 860     // Statics for hand-coded Boyer-Moore search
 861     private static final byte[] CLASSPATH_CHARS =
 862             {'C','L','A','S','S','-','P','A','T','H', ':', ' '};
 863 
 864     // The bad character shift for "class-path: "
 865     private static final byte[] CLASSPATH_LASTOCC;
 866 
 867     // The good suffix shift for "class-path: "
 868     private static final byte[] CLASSPATH_OPTOSFT;
 869 
 870     private static final byte[] MULTIRELEASE_CHARS =
 871             {'M','U','L','T','I','-','R','E','L','E', 'A', 'S', 'E', ':',
 872                     ' ', 'T', 'R', 'U', 'E'};
 873 
 874     // The bad character shift for "multi-release: true"
 875     private static final byte[] MULTIRELEASE_LASTOCC;
 876 
 877     // The good suffix shift for "multi-release: true"
 878     private static final byte[] MULTIRELEASE_OPTOSFT;
 879 
 880     static {
 881         CLASSPATH_LASTOCC = new byte[65];
 882         CLASSPATH_OPTOSFT = new byte[12];
 883         CLASSPATH_LASTOCC[(int)'C' - 32] = 1;
 884         CLASSPATH_LASTOCC[(int)'L' - 32] = 2;
 885         CLASSPATH_LASTOCC[(int)'S' - 32] = 5;
 886         CLASSPATH_LASTOCC[(int)'-' - 32] = 6;
 887         CLASSPATH_LASTOCC[(int)'P' - 32] = 7;
 888         CLASSPATH_LASTOCC[(int)'A' - 32] = 8;
 889         CLASSPATH_LASTOCC[(int)'T' - 32] = 9;
 890         CLASSPATH_LASTOCC[(int)'H' - 32] = 10;
 891         CLASSPATH_LASTOCC[(int)':' - 32] = 11;
 892         CLASSPATH_LASTOCC[(int)' ' - 32] = 12;
 893         for (int i = 0; i < 11; i++) {
 894             CLASSPATH_OPTOSFT[i] = 12;
 895         }
 896         CLASSPATH_OPTOSFT[11] = 1;
 897 
 898         MULTIRELEASE_LASTOCC = new byte[65];
 899         MULTIRELEASE_OPTOSFT = new byte[19];
 900         MULTIRELEASE_LASTOCC[(int)'M' - 32] = 1;
 901         MULTIRELEASE_LASTOCC[(int)'I' - 32] = 5;
 902         MULTIRELEASE_LASTOCC[(int)'-' - 32] = 6;
 903         MULTIRELEASE_LASTOCC[(int)'L' - 32] = 9;
 904         MULTIRELEASE_LASTOCC[(int)'A' - 32] = 11;
 905         MULTIRELEASE_LASTOCC[(int)'S' - 32] = 12;
 906         MULTIRELEASE_LASTOCC[(int)':' - 32] = 14;
 907         MULTIRELEASE_LASTOCC[(int)' ' - 32] = 15;
 908         MULTIRELEASE_LASTOCC[(int)'T' - 32] = 16;
 909         MULTIRELEASE_LASTOCC[(int)'R' - 32] = 17;
 910         MULTIRELEASE_LASTOCC[(int)'U' - 32] = 18;
 911         MULTIRELEASE_LASTOCC[(int)'E' - 32] = 19;
 912         for (int i = 0; i < 17; i++) {
 913             MULTIRELEASE_OPTOSFT[i] = 19;
 914         }
 915         MULTIRELEASE_OPTOSFT[17] = 6;
 916         MULTIRELEASE_OPTOSFT[18] = 1;
 917     }
 918 
 919     private JarEntry getManEntry() {
 920         if (manEntry == null) {
 921             // First look up manifest entry using standard name
 922             JarEntry manEntry = getEntry0(MANIFEST_NAME);
 923             if (manEntry == null) {
 924                 // If not found, then iterate through all the "META-INF/"
 925                 // entries to find a match.
 926                 String[] names = getMetaInfEntryNames();
 927                 if (names != null) {
 928                     for (String name : names) {
 929                         if (MANIFEST_NAME.equals(name.toUpperCase(Locale.ENGLISH))) {
 930                             manEntry = getEntry0(name);
 931                             break;
 932                         }
 933                     }
 934                 }
 935             }
 936             this.manEntry = manEntry;
 937         }
 938         return manEntry;
 939     }
 940 
 941    /**
 942     * Returns {@code true} iff this JAR file has a manifest with the
 943     * Class-Path attribute
 944     */
 945     boolean hasClassPathAttribute() throws IOException {
 946         checkForSpecialAttributes();
 947         return hasClassPathAttribute;
 948     }
 949 
 950     /**
 951      * Returns true if the pattern {@code src} is found in {@code b}.
 952      * The {@code lastOcc} array is the precomputed bad character shifts.
 953      * Since there are no repeated substring in our search strings,
 954      * the good suffix shifts can be replaced with a comparison.
 955      */
 956     private int match(byte[] src, byte[] b, byte[] lastOcc, byte[] optoSft) {
 957         int len = src.length;
 958         int last = b.length - len;
 959         int i = 0;
 960         next:
 961         while (i <= last) {
 962             for (int j = (len - 1); j >= 0; j--) {
 963                 byte c = b[i + j];
 964                 if (c >= ' ' && c <= 'z') {
 965                     if (c >= 'a') c -= 32; // Canonicalize
 966 
 967                     if (c != src[j]) {
 968                         // no match
 969                         int badShift = lastOcc[c - 32];
 970                         i += Math.max(j + 1 - badShift, optoSft[j]);
 971                         continue next;
 972                     }
 973                 } else {
 974                     // no match, character not valid for name
 975                     i += len;
 976                     continue next;
 977                 }
 978             }
 979             return i;
 980         }
 981         return -1;
 982     }
 983 
 984     /**
 985      * On first invocation, check if the JAR file has the Class-Path
 986      * and the Multi-Release attribute. A no-op on subsequent calls.
 987      */
 988     private void checkForSpecialAttributes() throws IOException {
 989         if (hasCheckedSpecialAttributes) {
 990             return;
 991         }
 992         synchronized (this) {
 993             if (hasCheckedSpecialAttributes) {
 994                 return;
 995             }
 996             JarEntry manEntry = getManEntry();
 997             if (manEntry != null) {
 998                 byte[] b = getBytes(manEntry);
 999                 hasClassPathAttribute = match(CLASSPATH_CHARS, b,
1000                         CLASSPATH_LASTOCC, CLASSPATH_OPTOSFT) != -1;
1001                 // is this a multi-release jar file
1002                 if (MULTI_RELEASE_ENABLED) {
1003                     int i = match(MULTIRELEASE_CHARS, b, MULTIRELEASE_LASTOCC,
1004                             MULTIRELEASE_OPTOSFT);
1005                     if (i != -1) {
1006                         i += MULTIRELEASE_CHARS.length;
1007                         if (i < b.length) {
1008                             byte c = b[i++];
1009                             // Check that the value is followed by a newline
1010                             // and does not have a continuation
1011                             if (c == '\n' &&
1012                                     (i == b.length || b[i] != ' ')) {
1013                                 isMultiRelease = true;
1014                             } else if (c == '\r') {
1015                                 if (i == b.length) {
1016                                     isMultiRelease = true;
1017                                 } else {
1018                                     c = b[i++];
1019                                     if (c == '\n') {
1020                                         if (i == b.length || b[i] != ' ') {
1021                                             isMultiRelease = true;
1022                                         }
1023                                     } else if (c != ' ') {
1024                                         isMultiRelease = true;
1025                                     }
1026                                 }
1027                             }
1028                         }
1029                     }
1030                 }
1031             }
1032             hasCheckedSpecialAttributes = true;
1033         }
1034     }
1035 
1036     private synchronized void ensureInitialization() {
1037         try {
1038             maybeInstantiateVerifier();
1039         } catch (IOException e) {
1040             throw new RuntimeException(e);
1041         }
1042         if (jv != null && !jvInitialized) {
1043             initializeVerifier();
1044             jvInitialized = true;
1045         }
1046     }
1047 
1048     /*
1049      * Returns a versioned {@code JarFileEntry} for the given entry,
1050      * if there is one. Otherwise returns the original entry. This
1051      * is invoked by the {@code entries2} for verifier.
1052      */
1053     JarEntry newEntry(JarEntry je) {
1054         if (isMultiRelease()) {
1055             return getVersionedEntry(je.getName(), je);
1056         }
1057         return je;
1058     }
1059 
1060     /*
1061      * Returns a versioned {@code JarFileEntry} for the given entry
1062      * name, if there is one. Otherwise returns a {@code JarFileEntry}
1063      * with the given name. It is invoked from JarVerifier's entries2
1064      * for {@code singers}.
1065      */
1066     JarEntry newEntry(String name) {
1067         if (isMultiRelease()) {
1068             JarEntry vje = getVersionedEntry(name, (JarEntry)null);
1069             if (vje != null) {
1070                 return vje;
1071             }
1072         }
1073         return new JarFileEntry(name);
1074     }
1075 
1076     Enumeration<String> entryNames(CodeSource[] cs) {
1077         ensureInitialization();
1078         if (jv != null) {
1079             return jv.entryNames(this, cs);
1080         }
1081 
1082         /*
1083          * JAR file has no signed content. Is there a non-signing
1084          * code source?
1085          */
1086         boolean includeUnsigned = false;
1087         for (CodeSource c : cs) {
1088             if (c.getCodeSigners() == null) {
1089                 includeUnsigned = true;
1090                 break;
1091             }
1092         }
1093         if (includeUnsigned) {
1094             return unsignedEntryNames();
1095         } else {
1096             return new Enumeration<>() {
1097 
1098                 public boolean hasMoreElements() {
1099                     return false;
1100                 }
1101 
1102                 public String nextElement() {
1103                     throw new NoSuchElementException();
1104                 }
1105             };
1106         }
1107     }
1108 
1109     /**
1110      * Returns an enumeration of the zip file entries
1111      * excluding internal JAR mechanism entries and including
1112      * signed entries missing from the ZIP directory.
1113      */
1114     Enumeration<JarEntry> entries2() {
1115         ensureInitialization();
1116         if (jv != null) {
1117             return jv.entries2(this, JUZFA.entries(JarFile.this,
1118                                                    JarFileEntry::new));
1119         }
1120 
1121         // screen out entries which are never signed
1122         final var unfilteredEntries = JUZFA.entries(JarFile.this, JarFileEntry::new);
1123 
1124         return new Enumeration<>() {
1125 
1126             JarEntry entry;
1127 
1128             public boolean hasMoreElements() {
1129                 if (entry != null) {
1130                     return true;
1131                 }
1132                 while (unfilteredEntries.hasMoreElements()) {
1133                     JarEntry je = unfilteredEntries.nextElement();
1134                     if (JarVerifier.isSigningRelated(je.getName())) {
1135                         continue;
1136                     }
1137                     entry = je;
1138                     return true;
1139                 }
1140                 return false;
1141             }
1142 
1143             public JarEntry nextElement() {
1144                 if (hasMoreElements()) {
1145                     JarEntry je = entry;
1146                     entry = null;
1147                     return newEntry(je);
1148                 }
1149                 throw new NoSuchElementException();
1150             }
1151         };
1152     }
1153 
1154     CodeSource[] getCodeSources(URL url) {
1155         ensureInitialization();
1156         if (jv != null) {
1157             return jv.getCodeSources(this, url);
1158         }
1159 
1160         /*
1161          * JAR file has no signed content. Is there a non-signing
1162          * code source?
1163          */
1164         Enumeration<String> unsigned = unsignedEntryNames();
1165         if (unsigned.hasMoreElements()) {
1166             return new CodeSource[]{JarVerifier.getUnsignedCS(url)};
1167         } else {
1168             return null;
1169         }
1170     }
1171 
1172     private Enumeration<String> unsignedEntryNames() {
1173         final Enumeration<JarEntry> entries = entries();
1174         return new Enumeration<>() {
1175 
1176             String name;
1177 
1178             /*
1179              * Grab entries from ZIP directory but screen out
1180              * metadata.
1181              */
1182             public boolean hasMoreElements() {
1183                 if (name != null) {
1184                     return true;
1185                 }
1186                 while (entries.hasMoreElements()) {
1187                     String value;
1188                     ZipEntry e = entries.nextElement();
1189                     value = e.getName();
1190                     if (e.isDirectory() || JarVerifier.isSigningRelated(value)) {
1191                         continue;
1192                     }
1193                     name = value;
1194                     return true;
1195                 }
1196                 return false;
1197             }
1198 
1199             public String nextElement() {
1200                 if (hasMoreElements()) {
1201                     String value = name;
1202                     name = null;
1203                     return value;
1204                 }
1205                 throw new NoSuchElementException();
1206             }
1207         };
1208     }
1209 
1210     CodeSource getCodeSource(URL url, String name) {
1211         ensureInitialization();
1212         if (jv != null) {
1213             if (jv.eagerValidation) {
1214                 CodeSource cs = null;
1215                 JarEntry je = getJarEntry(name);
1216                 if (je != null) {
1217                     cs = jv.getCodeSource(url, this, je);
1218                 } else {
1219                     cs = jv.getCodeSource(url, name);
1220                 }
1221                 return cs;
1222             } else {
1223                 return jv.getCodeSource(url, name);
1224             }
1225         }
1226 
1227         return JarVerifier.getUnsignedCS(url);
1228     }
1229 
1230     void setEagerValidation(boolean eager) {
1231         try {
1232             maybeInstantiateVerifier();
1233         } catch (IOException e) {
1234             throw new RuntimeException(e);
1235         }
1236         if (jv != null) {
1237             jv.setEagerValidation(eager);
1238         }
1239     }
1240 
1241     List<Object> getManifestDigests() {
1242         ensureInitialization();
1243         if (jv != null) {
1244             return jv.getManifestDigests();
1245         }
1246         return new ArrayList<>();
1247     }
1248 }