361 lines
11 KiB
Java
361 lines
11 KiB
Java
/*
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* Copyright (c) 1996, 2013, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package sun.tools.jar;
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import java.io.*;
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import java.util.*;
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import java.security.*;
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import sun.net.www.MessageHeader;
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import java.util.Base64;
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import sun.security.pkcs.*;
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import sun.security.x509.AlgorithmId;
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/**
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* <p>A signature file as defined in the <a
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* href="manifest.html">Manifest and Signature Format</a>. It has
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* essentially the same structure as a Manifest file in that it is a
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* set of RFC 822 headers (sections). The first section contains meta
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* data relevant to the entire file (i.e "Signature-Version:1.0") and
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* each subsequent section contains data relevant to specific entries:
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* entry sections.
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*
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* <p>Each entry section contains the name of an entry (which must
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* have a counterpart in the manifest). Like the manifest it contains
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* a hash, the hash of the manifest section corresponding to the
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* name. Since the manifest entry contains the hash of the data, this
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* is equivalent to a signature of the data, plus the attributes of
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* the manifest entry.
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*
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* <p>This signature file format deal with PKCS7 encoded DSA signature
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* block. It should be straightforward to extent to support other
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* algorithms.
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*
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* @author David Brown
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* @author Benjamin Renaud */
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public class SignatureFile {
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/* Are we debugging? */
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static final boolean debug = false;
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/* list of headers that all pertain to a particular file in the
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* archive */
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private Vector<MessageHeader> entries = new Vector<>();
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/* Right now we only support SHA hashes */
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static final String[] hashes = {"SHA"};
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static final void debug(String s) {
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if (debug)
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System.out.println("sig> " + s);
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}
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/*
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* The manifest we're working with. */
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private Manifest manifest;
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/*
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* The file name for the file. This is the raw name, i.e. the
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* extention-less 8 character name (such as MYSIGN) which wil be
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* used to build the signature filename (MYSIGN.SF) and the block
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* filename (MYSIGN.DSA) */
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private String rawName;
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/* The digital signature block corresponding to this signature
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* file. */
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private PKCS7 signatureBlock;
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/**
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* Private constructor which takes a name a given signature
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* file. The name must be extension-less and less or equal to 8
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* character in length. */
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private SignatureFile(String name) throws JarException {
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entries = new Vector<>();
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if (name != null) {
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if (name.length() > 8 || name.indexOf('.') != -1) {
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throw new JarException("invalid file name");
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}
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rawName = name.toUpperCase(Locale.ENGLISH);
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}
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}
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/**
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* Private constructor which takes a name a given signature file
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* and a new file predicate. If it is a new file, a main header
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* will be added. */
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private SignatureFile(String name, boolean newFile)
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throws JarException {
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this(name);
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if (newFile) {
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MessageHeader globals = new MessageHeader();
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globals.set("Signature-Version", "1.0");
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entries.addElement(globals);
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}
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}
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/**
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* Constructs a new Signature file corresponding to a given
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* Manifest. All entries in the manifest are signed.
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*
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* @param manifest the manifest to use.
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*
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* @param name for this signature file. This should
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* be less than 8 characters, and without a suffix (i.e.
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* without a period in it.
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*
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* @exception JarException if an invalid name is passed in.
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*/
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public SignatureFile(Manifest manifest, String name)
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throws JarException {
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this(name, true);
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this.manifest = manifest;
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Enumeration<MessageHeader> enum_ = manifest.entries();
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while (enum_.hasMoreElements()) {
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MessageHeader mh = enum_.nextElement();
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String entryName = mh.findValue("Name");
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if (entryName != null) {
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add(entryName);
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}
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}
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}
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/**
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* Constructs a new Signature file corresponding to a given
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* Manifest. Specific entries in the manifest are signed.
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*
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* @param manifest the manifest to use.
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*
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* @param entries the entries to sign.
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*
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* @param filename for this signature file. This should
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* be less than 8 characters, and without a suffix (i.e.
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* without a period in it.
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*
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* @exception JarException if an invalid name is passed in.
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*/
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public SignatureFile(Manifest manifest, String[] entries,
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String filename)
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throws JarException {
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this(filename, true);
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this.manifest = manifest;
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add(entries);
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}
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/**
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* Construct a Signature file from an input stream.
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*
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* @exception IOException if an invalid name is passed in or if a
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* stream exception occurs.
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*/
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public SignatureFile(InputStream is, String filename)
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throws IOException {
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this(filename);
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while (is.available() > 0) {
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MessageHeader m = new MessageHeader(is);
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entries.addElement(m);
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}
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}
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/**
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* Construct a Signature file from an input stream.
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*
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* @exception IOException if an invalid name is passed in or if a
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* stream exception occurs.
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*/
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public SignatureFile(InputStream is) throws IOException {
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this(is, null);
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}
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public SignatureFile(byte[] bytes) throws IOException {
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this(new ByteArrayInputStream(bytes));
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}
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/**
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* Returns the name of the signature file, ending with a ".SF"
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* suffix */
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public String getName() {
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return "META-INF/" + rawName + ".SF";
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}
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/**
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* Returns the name of the block file, ending with a block suffix
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* such as ".DSA". */
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public String getBlockName() {
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String suffix = "DSA";
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if (signatureBlock != null) {
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SignerInfo info = signatureBlock.getSignerInfos()[0];
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suffix = info.getDigestEncryptionAlgorithmId().getName();
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String temp = AlgorithmId.getEncAlgFromSigAlg(suffix);
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if (temp != null) suffix = temp;
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}
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return "META-INF/" + rawName + "." + suffix;
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}
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/**
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* Returns the signature block associated with this file.
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*/
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public PKCS7 getBlock() {
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return signatureBlock;
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}
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/**
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* Sets the signature block associated with this file.
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*/
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public void setBlock(PKCS7 block) {
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this.signatureBlock = block;
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}
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/**
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* Add a set of entries from the current manifest.
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*/
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public void add(String[] entries) throws JarException {
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for (int i = 0; i < entries.length; i++) {
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add (entries[i]);
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}
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}
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/**
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* Add a specific entry from the current manifest.
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*/
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public void add(String entry) throws JarException {
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MessageHeader mh = manifest.getEntry(entry);
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if (mh == null) {
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throw new JarException("entry " + entry + " not in manifest");
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}
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MessageHeader smh;
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try {
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smh = computeEntry(mh);
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} catch (IOException e) {
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throw new JarException(e.getMessage());
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}
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entries.addElement(smh);
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}
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/**
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* Get the entry corresponding to a given name. Returns null if
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*the entry does not exist.
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*/
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public MessageHeader getEntry(String name) {
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Enumeration<MessageHeader> enum_ = entries();
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while(enum_.hasMoreElements()) {
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MessageHeader mh = enum_.nextElement();
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if (name.equals(mh.findValue("Name"))) {
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return mh;
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}
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}
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return null;
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}
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/**
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* Returns the n-th entry. The global header is a entry 0. */
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public MessageHeader entryAt(int n) {
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return entries.elementAt(n);
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}
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/**
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* Returns an enumeration of the entries.
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*/
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public Enumeration<MessageHeader> entries() {
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return entries.elements();
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}
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/**
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* Given a manifest entry, computes the signature entry for this
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* manifest entry.
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*/
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private MessageHeader computeEntry(MessageHeader mh) throws IOException {
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MessageHeader smh = new MessageHeader();
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String name = mh.findValue("Name");
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if (name == null) {
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return null;
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}
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smh.set("Name", name);
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try {
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for (int i = 0; i < hashes.length; ++i) {
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MessageDigest dig = getDigest(hashes[i]);
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ByteArrayOutputStream baos = new ByteArrayOutputStream();
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PrintStream ps = new PrintStream(baos);
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mh.print(ps);
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byte[] headerBytes = baos.toByteArray();
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byte[] digest = dig.digest(headerBytes);
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smh.set(hashes[i] + "-Digest", Base64.getMimeEncoder().encodeToString(digest));
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}
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return smh;
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} catch (NoSuchAlgorithmException e) {
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throw new JarException(e.getMessage());
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}
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}
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private Hashtable<String, MessageDigest> digests = new Hashtable<>();
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private MessageDigest getDigest(String algorithm)
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throws NoSuchAlgorithmException {
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MessageDigest dig = digests.get(algorithm);
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if (dig == null) {
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dig = MessageDigest.getInstance(algorithm);
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digests.put(algorithm, dig);
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}
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dig.reset();
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return dig;
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}
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/**
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* Add a signature file at current position in a stream
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*/
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public void stream(OutputStream os) throws IOException {
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/* the first header in the file should be the global one.
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* It should say "SignatureFile-Version: x.x"; barf if not
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*/
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MessageHeader globals = entries.elementAt(0);
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if (globals.findValue("Signature-Version") == null) {
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throw new JarException("Signature file requires " +
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"Signature-Version: 1.0 in 1st header");
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}
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PrintStream ps = new PrintStream(os);
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globals.print(ps);
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for (int i = 1; i < entries.size(); ++i) {
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MessageHeader mh = entries.elementAt(i);
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mh.print(ps);
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}
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}
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}
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