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