/*
* @(#)JarFile.java 1.67 06/04/07
*
* Copyright 2006 Sun Microsystems, Inc. All rights reserved.
* SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
*/
package java.util.jar;
import java.io.*;
import java.lang.ref.SoftReference;
import java.util.*;
import java.util.zip.*;
import java.security.CodeSigner;
import java.security.cert.Certificate;
import java.security.AccessController;
import sun.security.action.GetPropertyAction;
import sun.security.util.ManifestEntryVerifier;
import sun.misc.SharedSecrets;
/**
* The <code>JarFile</code> class is used to read the contents of a jar file
* from any file that can be opened with <code>java.io.RandomAccessFile</code>.
* It extends the class <code>java.util.zip.ZipFile</code> with support
* for reading an optional <code>Manifest</code> entry. The
* <code>Manifest</code> can be used to specify meta-information about the
* jar file and its entries.
*
* <p> Unless otherwise noted, passing a <tt>null</tt> argument to a constructor
* or method in this class will cause a {@link NullPointerException} to be
* thrown.
*
* @author David Connelly
* @version 1.67, 04/07/06
* @see Manifest
* @see java.util.zip.ZipFile
* @see java.util.jar.JarEntry
* @since 1.2
*/
public
class JarFile extends ZipFile {
private SoftReference<Manifest> manRef;
private JarEntry manEntry;
private JarVerifier jv;
private boolean jvInitialized;
private boolean verify;
private boolean computedHasClassPathAttribute;
private boolean hasClassPathAttribute;
// Set up JavaUtilJarAccess in SharedSecrets
static {
SharedSecrets.setJavaUtilJarAccess(new JavaUtilJarAccessImpl());
}
/**
* The JAR manifest file name.
*/
public static final String MANIFEST_NAME = "META-INF/MANIFEST.MF";
/**
* Creates a new <code>JarFile</code> to read from the specified
* file <code>name</code>. The <code>JarFile</code> will be verified if
* it is signed.
* @param name the name of the jar file to be opened for reading
* @throws IOException if an I/O error has occurred
* @throws SecurityException if access to the file is denied
* by the SecurityManager
*/
public JarFile(String name) throws IOException {
this(new File(name), true, ZipFile.OPEN_READ);
}
/**
* Creates a new <code>JarFile</code> to read from the specified
* file <code>name</code>.
* @param name the name of the jar file to be opened for reading
* @param verify whether or not to verify the jar file if
* it is signed.
* @throws IOException if an I/O error has occurred
* @throws SecurityException if access to the file is denied
* by the SecurityManager
*/
public JarFile(String name, boolean verify) throws IOException {
this(new File(name), verify, ZipFile.OPEN_READ);
}
/**
* Creates a new <code>JarFile</code> to read from the specified
* <code>File</code> object. The <code>JarFile</code> will be verified if
* it is signed.
* @param file the jar file to be opened for reading
* @throws IOException if an I/O error has occurred
* @throws SecurityException if access to the file is denied
* by the SecurityManager
*/
public JarFile(File file) throws IOException {
this(file, true, ZipFile.OPEN_READ);
}
/**
* Creates a new <code>JarFile</code> to read from the specified
* <code>File</code> object.
* @param file the jar file to be opened for reading
* @param verify whether or not to verify the jar file if
* it is signed.
* @throws IOException if an I/O error has occurred
* @throws SecurityException if access to the file is denied
* by the SecurityManager.
*/
public JarFile(File file, boolean verify) throws IOException {
this(file, verify, ZipFile.OPEN_READ);
}
/**
* Creates a new <code>JarFile</code> to read from the specified
* <code>File</code> object in the specified mode. The mode argument
* must be either <tt>OPEN_READ</tt> or <tt>OPEN_READ | OPEN_DELETE</tt>.
*
* @param file the jar file to be opened for reading
* @param verify whether or not to verify the jar file if
* it is signed.
* @param mode the mode in which the file is to be opened
* @throws IOException if an I/O error has occurred
* @throws IllegalArgumentException
* if the <tt>mode</tt> argument is invalid
* @throws SecurityException if access to the file is denied
* by the SecurityManager
* @since 1.3
*/
public JarFile(File file, boolean verify, int mode) throws IOException {
super(file, mode);
this.verify = verify;
}
/**
* Returns the jar file manifest, or <code>null</code> if none.
*
* @return the jar file manifest, or <code>null</code> if none
*
* @throws IllegalStateException
* may be thrown if the jar file has been closed
*/
public Manifest getManifest() throws IOException {
return getManifestFromReference();
}
private Manifest getManifestFromReference() throws IOException {
Manifest man = manRef != null ? manRef.get() : null;
if (man == null) {
JarEntry manEntry = getManEntry();
// If found then load the manifest
if (manEntry != null) {
if (verify) {
byte[] b = getBytes(manEntry);
man = new Manifest(new ByteArrayInputStream(b));
if (!jvInitialized) {
jv = new JarVerifier(b);
}
} else {
man = new Manifest(super.getInputStream(manEntry));
}
manRef = new SoftReference(man);
}
}
return man;
}
private native String[] getMetaInfEntryNames();
/**
* Returns the <code>JarEntry</code> for the given entry name or
* <code>null</code> if not found.
*
* @param name the jar file entry name
* @return the <code>JarEntry</code> for the given entry name or
* <code>null</code> if not found.
*
* @throws IllegalStateException
* may be thrown if the jar file has been closed
*
* @see java.util.jar.JarEntry
*/
public JarEntry getJarEntry(String name) {
return (JarEntry)getEntry(name);
}
/**
* Returns the <code>ZipEntry</code> for the given entry name or
* <code>null</code> if not found.
*
* @param name the jar file entry name
* @return the <code>ZipEntry</code> for the given entry name or
* <code>null</code> if not found
*
* @throws IllegalStateException
* may be thrown if the jar file has been closed
*
* @see java.util.zip.ZipEntry
*/
public ZipEntry getEntry(String name) {
ZipEntry ze = super.getEntry(name);
if (ze != null) {
return new JarFileEntry(ze);
}
return null;
}
/**
* Returns an enumeration of the zip file entries.
*/
public Enumeration<JarEntry> entries() {
final Enumeration enum_ = super.entries();
return new Enumeration<JarEntry>() {
public boolean hasMoreElements() {
return enum_.hasMoreElements();
}
public JarFileEntry nextElement() {
ZipEntry ze = (ZipEntry)enum_.nextElement();
return new JarFileEntry(ze);
}
};
}
private class JarFileEntry extends JarEntry {
JarFileEntry(ZipEntry ze) {
super(ze);
}
public Attributes getAttributes() throws IOException {
Manifest man = JarFile.this.getManifest();
if (man != null) {
return man.getAttributes(getName());
} else {
return null;
}
}
public Certificate[] getCertificates() {
try {
maybeInstantiateVerifier();
} catch (IOException e) {
throw new RuntimeException(e);
}
if (certs == null && jv != null) {
certs = jv.getCerts(getName());
}
return certs == null ? null : (Certificate[]) certs.clone();
}
public CodeSigner[] getCodeSigners() {
try {
maybeInstantiateVerifier();
} catch (IOException e) {
throw new RuntimeException(e);
}
if (signers == null && jv != null) {
signers = jv.getCodeSigners(getName());
}
return signers == null ? null : (CodeSigner[]) signers.clone();
}
}
/*
* Ensures that the JarVerifier has been created if one is
* necessary (i.e., the jar appears to be signed.) This is done as
* a quick check to avoid processing of the manifest for unsigned
* jars.
*/
private void maybeInstantiateVerifier() throws IOException {
if (jv != null) {
return;
}
if (verify) {
String[] names = getMetaInfEntryNames();
if (names != null) {
for (int i = 0; i < names.length; i++) {
String name = names[i].toUpperCase(Locale.ENGLISH);
if (name.endsWith(".DSA") ||
name.endsWith(".RSA") ||
name.endsWith(".SF")) {
// Assume since we found a signature-related file
// that the jar is signed and that we therefore
// need a JarVerifier and Manifest
getManifest();
return;
}
}
}
// No signature-related files; don't instantiate a
// verifier
verify = false;
}
}
/*
* Initializes the verifier object by reading all the manifest
* entries and passing them to the verifier.
*/
private void initializeVerifier() {
ManifestEntryVerifier mev = null;
// Verify "META-INF/" entries...
try {
String[] names = getMetaInfEntryNames();
if (names != null) {
for (int i = 0; i < names.length; i++) {
JarEntry e = getJarEntry(names[i]);
if (!e.isDirectory()) {
if (mev == null) {
mev = new ManifestEntryVerifier
(getManifestFromReference());
}
byte[] b = getBytes(e);
if (b != null && b.length > 0) {
jv.beginEntry(e, mev);
jv.update(b.length, b, 0, b.length, mev);
jv.update(-1, null, 0, 0, mev);
}
}
}
}
} catch (IOException ex) {
// if we had an error parsing any blocks, just
// treat the jar file as being unsigned
jv = null;
verify = false;
}
// if after initializing the verifier we have nothing
// signed, we null it out.
if (jv != null) {
jv.doneWithMeta();
if (JarVerifier.debug != null) {
JarVerifier.debug.println("done with meta!");
}
if (jv.nothingToVerify()) {
if (JarVerifier.debug != null) {
JarVerifier.debug.println("nothing to verify!");
}
jv = null;
verify = false;
}
}
}
/*
* Reads all the bytes for a given entry. Used to process the
* META-INF files.
*/
private byte[] getBytes(ZipEntry ze) throws IOException {
byte[] b = new byte[(int)ze.getSize()];
DataInputStream is = new DataInputStream(super.getInputStream(ze));
is.readFully(b, 0, b.length);
is.close();
return b;
}
/**
* Returns an input stream for reading the contents of the specified
* zip file entry.
* @param ze the zip file entry
* @return an input stream for reading the contents of the specified
* zip file entry
* @throws ZipException if a zip file format error has occurred
* @throws IOException if an I/O error has occurred
* @throws SecurityException if any of the jar file entries
* are incorrectly signed.
* @throws IllegalStateException
* may be thrown if the jar file has been closed
*/
public synchronized InputStream getInputStream(ZipEntry ze)
throws IOException
{
maybeInstantiateVerifier();
if (jv == null) {
return super.getInputStream(ze);
}
if (!jvInitialized) {
initializeVerifier();
jvInitialized = true;
// could be set to null after a call to
// initializeVerifier if we have nothing to
// verify
if (jv == null)
return super.getInputStream(ze);
}
// wrap a verifier stream around the real stream
return new JarVerifier.VerifierStream(
getManifestFromReference(),
ze instanceof JarFileEntry ?
(JarEntry) ze : getJarEntry(ze.getName()),
super.getInputStream(ze),
jv);
}
// Statics for hand-coded Boyer-Moore search in hasClassPathAttribute()
// The bad character shift for "class-path"
private static int[] lastOcc;
// The good suffix shift for "class-path"
private static int[] optoSft;
// Initialize the shift arrays to search for "class-path"
private static char[] src = {'c','l','a','s','s','-','p','a','t','h'};
static {
lastOcc = new int[128];
optoSft = new int[10];
lastOcc[(int)'c']=1;
lastOcc[(int)'l']=2;
lastOcc[(int)'s']=5;
lastOcc[(int)'-']=6;
lastOcc[(int)'p']=7;
lastOcc[(int)'a']=8;
lastOcc[(int)'t']=9;
lastOcc[(int)'h']=10;
for (int i=0; i<9; i++)
optoSft[i]=10;
optoSft[9]=1;
}
private JarEntry getManEntry() {
if (manEntry == null) {
// First look up manifest entry using standard name
manEntry = getJarEntry(MANIFEST_NAME);
if (manEntry == null) {
// If not found, then iterate through all the "META-INF/"
// entries to find a match.
String[] names = getMetaInfEntryNames();
if (names != null) {
for (int i = 0; i < names.length; i++) {
if (MANIFEST_NAME.equals(
names[i].toUpperCase(Locale.ENGLISH))) {
manEntry = getJarEntry(names[i]);
break;
}
}
}
}
}
return manEntry;
}
// Returns true iff this jar file has a manifest with a class path
// attribute. Returns false if there is no manifest or the manifest
// does not contain a "Class-Path" attribute. Currently exported to
// core libraries via sun.misc.SharedSecrets.
boolean hasClassPathAttribute() throws IOException {
if (computedHasClassPathAttribute) {
return hasClassPathAttribute;
}
hasClassPathAttribute = false;
if (!isKnownToNotHaveClassPathAttribute()) {
JarEntry manEntry = getManEntry();
if (manEntry != null) {
byte[] b = new byte[(int)manEntry.getSize()];
DataInputStream dis = new DataInputStream(
super.getInputStream(manEntry));
dis.readFully(b, 0, b.length);
dis.close();
int last = b.length - src.length;
int i = 0;
next:
while (i<=last) {
for (int j=9; j>=0; j--) {
char c = (char) b[i+j];
c = (((c-'A')|('Z'-c)) >= 0) ? (char)(c + 32) : c;
if (c != src[j]) {
i += Math.max(j + 1 - lastOcc[c&0x7F], optoSft[j]);
continue next;
}
}
hasClassPathAttribute = true;
break;
}
}
}
computedHasClassPathAttribute = true;
return hasClassPathAttribute;
}
private static String javaHome;
private static String[] jarNames;
private boolean isKnownToNotHaveClassPathAttribute() {
// Optimize away even scanning of manifest for jar files we
// deliver which don't have a class-path attribute. If one of
// these jars is changed to include such an attribute this code
// must be changed.
if (javaHome == null) {
javaHome = (String) AccessController.doPrivileged(
new GetPropertyAction("java.home"));
}
if (jarNames == null) {
String[] names = new String[10];
String fileSep = File.separator;
int i = 0;
names[i++] = fileSep + "rt.jar";
names[i++] = fileSep + "sunrsasign.jar";
names[i++] = fileSep + "jsse.jar";
names[i++] = fileSep + "jce.jar";
names[i++] = fileSep + "charsets.jar";
names[i++] = fileSep + "dnsns.jar";
names[i++] = fileSep + "ldapsec.jar";
names[i++] = fileSep + "localedata.jar";
names[i++] = fileSep + "sunjce_provider.jar";
names[i++] = fileSep + "sunpkcs11.jar";
jarNames = names;
}
String name = getName();
String localJavaHome = javaHome;
if (name.startsWith(localJavaHome)) {
String[] names = jarNames;
for (int i = 0; i < names.length; i++) {
if (name.endsWith(names[i])) {
return true;
}
}
}
return false;
}
}
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