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/*
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* Copyright (c) 2000, 2006, 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.security.provider.certpath;
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import java.io.BufferedInputStream;
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import java.io.ByteArrayInputStream;
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import java.io.ByteArrayOutputStream;
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import java.io.IOException;
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import java.io.InputStream;
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import java.security.cert.CertificateEncodingException;
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import java.security.cert.Certificate;
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import java.security.cert.CertificateException;
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import java.security.cert.CertificateFactory;
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import java.security.cert.X509Certificate;
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import java.util.*;
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import java.security.cert.CertPath;
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import sun.security.pkcs.ContentInfo;
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import sun.security.pkcs.PKCS7;
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import sun.security.pkcs.SignerInfo;
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import sun.security.x509.AlgorithmId;
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import sun.security.util.DerValue;
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import sun.security.util.DerOutputStream;
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import sun.security.util.DerInputStream;
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/**
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* A {@link java.security.cert.CertPath CertPath} (certification path)
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* consisting exclusively of
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* {@link java.security.cert.X509Certificate X509Certificate}s.
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* <p>
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* By convention, X.509 <code>CertPath</code>s are stored from target
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* to trust anchor.
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* That is, the issuer of one certificate is the subject of the following
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* one. However, unvalidated X.509 <code>CertPath</code>s may not follow
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* this convention. PKIX <code>CertPathValidator</code>s will detect any
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* departure from this convention and throw a
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* <code>CertPathValidatorException</code>.
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*
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* @author Yassir Elley
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* @since 1.4
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*/
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public class X509CertPath extends CertPath {
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private static final long serialVersionUID = 4989800333263052980L;
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/**
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* List of certificates in this chain
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*/
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private List<X509Certificate> certs;
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/**
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* The names of our encodings. PkiPath is the default.
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*/
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private static final String COUNT_ENCODING = "count";
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private static final String PKCS7_ENCODING = "PKCS7";
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private static final String PKIPATH_ENCODING = "PkiPath";
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/**
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* List of supported encodings
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*/
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private static final Collection<String> encodingList;
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static {
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List<String> list = new ArrayList<String>(2);
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list.add(PKIPATH_ENCODING);
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list.add(PKCS7_ENCODING);
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encodingList = Collections.unmodifiableCollection(list);
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}
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/**
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* Creates an <code>X509CertPath</code> from a <code>List</code> of
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* <code>X509Certificate</code>s.
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* <p>
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* The certificates are copied out of the supplied <code>List</code>
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* object.
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*
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* @param certs a <code>List</code> of <code>X509Certificate</code>s
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* @exception CertificateException if <code>certs</code> contains an element
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* that is not an <code>X509Certificate</code>
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*/
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public X509CertPath(List<? extends Certificate> certs) throws CertificateException {
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super("X.509");
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// Ensure that the List contains only X509Certificates
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for (Object obj : (List<?>)certs) {
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if (obj instanceof X509Certificate == false) {
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throw new CertificateException
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("List is not all X509Certificates: "
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+ obj.getClass().getName());
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}
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}
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// Assumes that the resulting List is thread-safe. This is true
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// because we ensure that it cannot be modified after construction
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// and the methods in the Sun JDK 1.4 implementation of ArrayList that
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// allow read-only access are thread-safe.
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this.certs = Collections.unmodifiableList(
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new ArrayList<X509Certificate>((List<X509Certificate>)certs));
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}
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/**
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* Creates an <code>X509CertPath</code>, reading the encoded form
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* from an <code>InputStream</code>. The data is assumed to be in
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* the default encoding.
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*
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* @param is the <code>InputStream</code> to read the data from
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* @exception CertificateException if an exception occurs while decoding
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*/
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public X509CertPath(InputStream is) throws CertificateException {
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this(is, PKIPATH_ENCODING);
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}
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/**
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* Creates an <code>X509CertPath</code>, reading the encoded form
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* from an InputStream. The data is assumed to be in the specified
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* encoding.
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*
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* @param is the <code>InputStream</code> to read the data from
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* @param encoding the encoding used
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* @exception CertificateException if an exception occurs while decoding or
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* the encoding requested is not supported
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*/
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public X509CertPath(InputStream is, String encoding)
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throws CertificateException {
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super("X.509");
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if (PKIPATH_ENCODING.equals(encoding)) {
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certs = parsePKIPATH(is);
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} else if (PKCS7_ENCODING.equals(encoding)) {
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certs = parsePKCS7(is);
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} else {
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throw new CertificateException("unsupported encoding");
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}
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}
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/**
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* Parse a PKIPATH format CertPath from an InputStream. Return an
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* unmodifiable List of the certificates.
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*
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* @param is the <code>InputStream</code> to read the data from
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* @return an unmodifiable List of the certificates
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* @exception CertificateException if an exception occurs
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*/
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private static List<X509Certificate> parsePKIPATH(InputStream is)
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throws CertificateException {
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List<X509Certificate> certList = null;
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CertificateFactory certFac = null;
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if (is == null) {
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throw new CertificateException("input stream is null");
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}
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try {
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DerInputStream dis = new DerInputStream(readAllBytes(is));
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DerValue[] seq = dis.getSequence(3);
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if (seq.length == 0) {
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return Collections.<X509Certificate>emptyList();
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}
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certFac = CertificateFactory.getInstance("X.509");
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certList = new ArrayList<X509Certificate>(seq.length);
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// append certs in reverse order (target to trust anchor)
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for (int i = seq.length-1; i >= 0; i--) {
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certList.add((X509Certificate)certFac.generateCertificate
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(new ByteArrayInputStream(seq[i].toByteArray())));
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}
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return Collections.unmodifiableList(certList);
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} catch (IOException ioe) {
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CertificateException ce = new CertificateException("IOException" +
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" parsing PkiPath data: " + ioe);
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ce.initCause(ioe);
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throw ce;
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}
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}
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/**
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* Parse a PKCS#7 format CertPath from an InputStream. Return an
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* unmodifiable List of the certificates.
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*
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* @param is the <code>InputStream</code> to read the data from
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* @return an unmodifiable List of the certificates
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* @exception CertificateException if an exception occurs
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*/
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private static List<X509Certificate> parsePKCS7(InputStream is)
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throws CertificateException {
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List<X509Certificate> certList;
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if (is == null) {
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throw new CertificateException("input stream is null");
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}
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try {
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if (is.markSupported() == false) {
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// Copy the entire input stream into an InputStream that does
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// support mark
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is = new ByteArrayInputStream(readAllBytes(is));
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};
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PKCS7 pkcs7 = new PKCS7(is);
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X509Certificate[] certArray = pkcs7.getCertificates();
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// certs are optional in PKCS #7
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if (certArray != null) {
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certList = Arrays.asList(certArray);
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} else {
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// no certs provided
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certList = new ArrayList<X509Certificate>(0);
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}
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} catch (IOException ioe) {
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throw new CertificateException("IOException parsing PKCS7 data: " +
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ioe);
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}
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// Assumes that the resulting List is thread-safe. This is true
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// because we ensure that it cannot be modified after construction
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// and the methods in the Sun JDK 1.4 implementation of ArrayList that
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// allow read-only access are thread-safe.
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return Collections.unmodifiableList(certList);
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}
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/*
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* Reads the entire contents of an InputStream into a byte array.
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*
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* @param is the InputStream to read from
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* @return the bytes read from the InputStream
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*/
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private static byte[] readAllBytes(InputStream is) throws IOException {
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byte[] buffer = new byte[8192];
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ByteArrayOutputStream baos = new ByteArrayOutputStream(2048);
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int n;
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while ((n = is.read(buffer)) != -1) {
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baos.write(buffer, 0, n);
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}
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return baos.toByteArray();
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}
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/**
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* Returns the encoded form of this certification path, using the
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* default encoding.
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*
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* @return the encoded bytes
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* @exception CertificateEncodingException if an encoding error occurs
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*/
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public byte[] getEncoded() throws CertificateEncodingException {
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// @@@ Should cache the encoded form
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return encodePKIPATH();
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}
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/**
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* Encode the CertPath using PKIPATH format.
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*
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* @return a byte array containing the binary encoding of the PkiPath object
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* @exception CertificateEncodingException if an exception occurs
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*/
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private byte[] encodePKIPATH() throws CertificateEncodingException {
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ListIterator<X509Certificate> li = certs.listIterator(certs.size());
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try {
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DerOutputStream bytes = new DerOutputStream();
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// encode certs in reverse order (trust anchor to target)
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// according to PkiPath format
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while (li.hasPrevious()) {
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X509Certificate cert = li.previous();
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// check for duplicate cert
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if (certs.lastIndexOf(cert) != certs.indexOf(cert)) {
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throw new CertificateEncodingException
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("Duplicate Certificate");
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}
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// get encoded certificates
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byte[] encoded = cert.getEncoded();
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bytes.write(encoded);
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}
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// Wrap the data in a SEQUENCE
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DerOutputStream derout = new DerOutputStream();
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derout.write(DerValue.tag_SequenceOf, bytes);
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return derout.toByteArray();
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} catch (IOException ioe) {
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CertificateEncodingException ce = new CertificateEncodingException
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("IOException encoding PkiPath data: " + ioe);
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ce.initCause(ioe);
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throw ce;
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}
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}
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/**
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* Encode the CertPath using PKCS#7 format.
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*
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* @return a byte array containing the binary encoding of the PKCS#7 object
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* @exception CertificateEncodingException if an exception occurs
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*/
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private byte[] encodePKCS7() throws CertificateEncodingException {
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PKCS7 p7 = new PKCS7(new AlgorithmId[0],
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new ContentInfo(ContentInfo.DATA_OID, null),
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certs.toArray(new X509Certificate[certs.size()]),
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new SignerInfo[0]);
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DerOutputStream derout = new DerOutputStream();
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try {
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p7.encodeSignedData(derout);
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} catch (IOException ioe) {
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throw new CertificateEncodingException(ioe.getMessage());
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}
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return derout.toByteArray();
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}
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/**
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* Returns the encoded form of this certification path, using the
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* specified encoding.
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*
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* @param encoding the name of the encoding to use
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* @return the encoded bytes
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* @exception CertificateEncodingException if an encoding error occurs or
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* the encoding requested is not supported
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*/
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public byte[] getEncoded(String encoding)
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throws CertificateEncodingException {
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if (PKIPATH_ENCODING.equals(encoding)) {
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return encodePKIPATH();
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} else if (PKCS7_ENCODING.equals(encoding)) {
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return encodePKCS7();
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} else {
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throw new CertificateEncodingException("unsupported encoding");
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}
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}
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/**
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* Returns the encodings supported by this certification path, with the
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* default encoding first.
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*
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* @return an <code>Iterator</code> over the names of the supported
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* encodings (as Strings)
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*/
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public static Iterator<String> getEncodingsStatic() {
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return encodingList.iterator();
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}
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/**
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* Returns an iteration of the encodings supported by this certification
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* path, with the default encoding first.
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* <p>
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* Attempts to modify the returned <code>Iterator</code> via its
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* <code>remove</code> method result in an
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* <code>UnsupportedOperationException</code>.
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*
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* @return an <code>Iterator</code> over the names of the supported
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* encodings (as Strings)
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*/
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public Iterator<String> getEncodings() {
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return getEncodingsStatic();
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}
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/**
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* Returns the list of certificates in this certification path.
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* The <code>List</code> returned must be immutable and thread-safe.
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*
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* @return an immutable <code>List</code> of <code>X509Certificate</code>s
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* (may be empty, but not null)
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*/
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public List<X509Certificate> getCertificates() {
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return certs;
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}
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}
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