/*
* @(#)JarVerifier.java 1.35 06/10/10
*
* Copyright 1990-2008 Sun Microsystems, Inc. All Rights Reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License version
* 2 only, as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License version 2 for more details (a copy is
* included at /legal/license.txt).
*
* You should have received a copy of the GNU General Public License
* version 2 along with this work; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA
*
* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa
* Clara, CA 95054 or visit www.sun.com if you need additional
* information or have any questions.
*
*/
package java.util.jar;
import java.io.*;
import java.util.*;
import java.util.zip.*;
import java.security.*;
import sun.security.util.ManifestDigester;
import sun.security.util.ManifestEntryVerifier;
import sun.security.util.SignatureFileVerifier;
import sun.security.util.Debug;
/**
*
* @version 1.35, 10/10/06
* @author Roland Schemers
*/
class JarVerifier {
/* Are we debugging ? */
static final Debug debug = Debug.getInstance("jar");
/* a table mapping names to identities for entries that have
had their actual hashes verified */
private Hashtable verifiedCerts;
/* a table mapping names to Certs for entries that have
passed the .SF/.DSA -> MANIFEST check */
private Hashtable sigFileCerts;
/* a hash table to hold .SF bytes */
private Hashtable sigFileData;
/** "queue" of pending PKCS7 blocks that we couldn't parse
* until we parsed the .SF file */
private ArrayList pendingBlocks;
/* cache of Certificate[] objects */
private ArrayList certCache;
/* Are we parsing a block? */
private boolean parsingBlockOrSF = false;
/* Are we done parsing META-INF entries? */
private boolean parsingMeta = true;
/* Are there are files to verify? */
private boolean anyToVerify = true;
/* The manifest file */
private Manifest manifest;
/* The output stream to use when keeping track of files we are interested
in */
private ByteArrayOutputStream baos;
/** The ManifestDigester object */
private ManifestDigester manDig;
/** the bytes for the manDig object */
byte manifestRawBytes[] = null;
/**
*/
public JarVerifier(Manifest manifest, byte rawBytes[]) {
manifestRawBytes = rawBytes;
sigFileCerts = new Hashtable();
verifiedCerts = new Hashtable();
sigFileData = new Hashtable(11);
pendingBlocks = new ArrayList();
baos = new ByteArrayOutputStream();
this.manifest = manifest;
}
/**
* This method scans to see which entry we're parsing and
* keeps various state information depending on what type of
* file is being parsed.
*/
public void beginEntry(JarEntry je, ManifestEntryVerifier mev)
throws IOException
{
if (je == null)
return;
if (debug != null) {
debug.println("beginEntry "+je.getName());
}
String name = je.getName();
/*
* Assumptions:
* 1. The manifest should be the first entry in the META-INF directory.
* 2. The .SF/.DSA files follow the manifest, before any normal entries
* 3. Any of the following will throw a SecurityException:
* a. digest mismatch between a manifest section and
* the SF section.
* b. digest mismatch between the actual jar entry and the manifest
*/
if (parsingMeta) {
String uname = name.toUpperCase(Locale.ENGLISH);
if ((uname.startsWith("META-INF/") ||
uname.startsWith("/META-INF/"))) {
if (je.isDirectory()) {
mev.setEntry(null, je);
return;
}
if (uname.endsWith(".DSA") || uname.endsWith(".RSA") ||
uname.endsWith(".SF")) {
/* We parse only DSA or RSA PKCS7 blocks. */
parsingBlockOrSF = true;
baos.reset();
mev.setEntry(null, je);
}
return;
}
}
if (parsingMeta) {
doneWithMeta();
}
if (je.isDirectory()) {
mev.setEntry(null, je);
return;
}
// be liberal in what you accept. If the name starts with ./, remove
// it as we internally canonicalize it with out the ./.
if (name.startsWith("./"))
name = name.substring(2);
// be liberal in what you accept. If the name starts with /, remove
// it as we internally canonicalize it with out the /.
if (name.startsWith("/"))
name = name.substring(1);
// only set the jev object for entries that have a signature
if (sigFileCerts.get(name) != null) {
mev.setEntry(name, je);
return;
}
// don't compute the digest for this entry
mev.setEntry(null, je);
return;
}
/**
* update a single byte.
*/
public void update(int b, ManifestEntryVerifier mev)
throws IOException
{
if (b != -1) {
if (parsingBlockOrSF) {
baos.write(b);
} else {
mev.update((byte)b);
}
} else {
processEntry(mev);
}
}
/**
* update an array of bytes.
*/
public void update(int n, byte[] b, int off, int len,
ManifestEntryVerifier mev)
throws IOException
{
if (n != -1) {
if (parsingBlockOrSF) {
baos.write(b, off, n);
} else {
mev.update(b, off, n);
}
} else {
processEntry(mev);
}
}
/**
* called when we reach the end of entry in one of the read() methods.
*/
private void processEntry(ManifestEntryVerifier mev)
throws IOException
{
if (!parsingBlockOrSF) {
JarEntry je = mev.getEntry();
if ((je != null) && (je.certs == null)) {
je.certs = mev.verify(verifiedCerts, sigFileCerts);
}
} else {
try {
parsingBlockOrSF = false;
if (debug != null) {
debug.println("processEntry: processing block");
}
String uname = mev.getEntry().getName()
.toUpperCase(Locale.ENGLISH);
if (uname.endsWith(".SF")) {
String key = uname.substring(0, uname.length()-3);
byte bytes[] = baos.toByteArray();
// add to sigFileData in case future blocks need it
sigFileData.put(key, bytes);
// check pending blocks, we can now process
// anyone waiting for this .SF file
Iterator it = pendingBlocks.iterator();
while (it.hasNext()) {
SignatureFileVerifier sfv =
(SignatureFileVerifier) it.next();
if (sfv.needSignatureFile(key)) {
if (debug != null) {
debug.println(
"processEntry: processing pending block");
}
sfv.setSignatureFile(bytes);
sfv.process(sigFileCerts);
}
}
return;
}
// now we are parsing a signature block file
String key = uname.substring(0, uname.lastIndexOf("."));
if (certCache == null)
certCache = new ArrayList();
if (manDig == null) {
synchronized(manifestRawBytes) {
if (manDig == null) {
manDig = new ManifestDigester(manifestRawBytes);
manifestRawBytes = null;
}
}
}
SignatureFileVerifier sfv =
new SignatureFileVerifier(certCache,
manDig, uname, baos.toByteArray());
if (sfv.needSignatureFileBytes()) {
// see if we have already parsed an external .SF file
byte[] bytes = (byte[]) sigFileData.get(key);
if (bytes == null) {
// put this block on queue for later processing
// since we don't have the .SF bytes yet
// (uname, block);
if (debug != null) {
debug.println("adding pending block");
}
pendingBlocks.add(sfv);
return;
} else {
sfv.setSignatureFile(bytes);
}
}
sfv.process(sigFileCerts);
} catch (sun.security.pkcs.ParsingException pe) {
if (debug != null) debug.println("processEntry caught: "+pe);
// ignore and treat as unsigned
} catch (IOException ioe) {
if (debug != null) debug.println("processEntry caught: "+ioe);
// ignore and treat as unsigned
} catch (SignatureException se) {
if (debug != null) debug.println("processEntry caught: "+se);
// ignore and treat as unsigned
} catch (NoSuchAlgorithmException nsae) {
if (debug != null) debug.println("processEntry caught: "+nsae);
// ignore and treat as unsigned
}
}
}
/**
* return an array of java.security.cert.Certificate objects for
* the given file in the jar. this array is not cloned.
*
*/
public java.security.cert.Certificate[] getCerts(String name)
{
return (java.security.cert.Certificate[])verifiedCerts.get(name);
}
/**
* returns true if there no files to verify.
* should only be called after all the META-INF entries
* have been processed.
*/
boolean nothingToVerify()
{
return (anyToVerify == false);
}
/**
* called to let us know we have processed all the
* META-INF entries, and if we re-read one of them, don't
* re-process it. Also gets rid of any data structures
* we needed when parsing META-INF entries.
*/
void doneWithMeta()
{
parsingMeta = false;
anyToVerify = !sigFileCerts.isEmpty();
baos = null;
sigFileData = null;
pendingBlocks = null;
certCache = null;
manDig = null;
}
static class VerifierStream extends java.io.InputStream {
private InputStream is;
private JarVerifier jv;
private ManifestEntryVerifier mev;
private long numLeft;
VerifierStream(Manifest man,
JarEntry je,
InputStream is,
JarVerifier jv) throws IOException
{
this.is = is;
this.jv = jv;
this.mev = new ManifestEntryVerifier(man);
this.jv.beginEntry(je, mev);
this.numLeft = je.getSize();
if (this.numLeft == 0)
this.jv.update(-1, this.mev);
}
public int read() throws IOException
{
if (numLeft > 0) {
int b = is.read();
jv.update(b, mev);
numLeft--;
if (numLeft == 0)
jv.update(-1, mev);
return b;
} else {
return -1;
}
}
public int read(byte b[], int off, int len) throws IOException {
if ((numLeft > 0) && (numLeft < len)) {
len = (int)numLeft;
}
if (numLeft > 0) {
int n = is.read(b, off, len);
jv.update(n, b, off, len, mev);
numLeft -= n;
if (numLeft == 0)
jv.update(-1, b, off, len, mev);
return n;
} else {
return -1;
}
}
public void close()
throws IOException
{
if (is != null)
is.close();
is = null;
mev = null;
jv = null;
}
public int available() throws IOException {
return is.available();
}
}
}