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/*
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code 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. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code 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 in the LICENSE file that
* accompanied this code).
*
* 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.
*
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package sun.security.provider;
import java.io.*;
import java.util.*;
import java.security.cert.*;
import sun.security.x509.X509CertImpl;
import sun.security.x509.X509CRLImpl;
import sun.security.pkcs.PKCS7;
import sun.security.provider.certpath.X509CertPath;
import sun.security.provider.certpath.X509CertificatePair;
import sun.security.util.DerValue;
import sun.security.util.Cache;
import java.util.Base64;
import sun.security.pkcs.ParsingException;
/**
* This class defines a certificate factory for X.509 v3 certificates &
* certification paths, and X.509 v2 certificate revocation lists (CRLs).
*
* @author Jan Luehe
* @author Hemma Prafullchandra
* @author Sean Mullan
*
*
* @see java.security.cert.CertificateFactorySpi
* @see java.security.cert.Certificate
* @see java.security.cert.CertPath
* @see java.security.cert.CRL
* @see java.security.cert.X509Certificate
* @see java.security.cert.X509CRL
* @see sun.security.x509.X509CertImpl
* @see sun.security.x509.X509CRLImpl
*/
public class X509Factory extends CertificateFactorySpi {
public static final String BEGIN_CERT = "-----BEGIN CERTIFICATE-----";
public static final String END_CERT = "-----END CERTIFICATE-----";
private static final int ENC_MAX_LENGTH = 4096 * 1024; // 4 MB MAX
private static final Cache<Object, X509CertImpl> certCache
= Cache.newSoftMemoryCache(750);
private static final Cache<Object, X509CRLImpl> crlCache
= Cache.newSoftMemoryCache(750);
/**
* Generates an X.509 certificate object and initializes it with
* the data read from the input stream <code>is</code>.
*
* @param is an input stream with the certificate data.
*
* @return an X.509 certificate object initialized with the data
* from the input stream.
*
* @exception CertificateException on parsing errors.
*/
@Override
public Certificate engineGenerateCertificate(InputStream is)
throws CertificateException
{
if (is == null) {
// clear the caches (for debugging)
certCache.clear();
X509CertificatePair.clearCache();
throw new CertificateException("Missing input stream");
}
try {
byte[] encoding = readOneBlock(is);
if (encoding != null) {
X509CertImpl cert = getFromCache(certCache, encoding);
if (cert != null) {
return cert;
}
cert = new X509CertImpl(encoding);
addToCache(certCache, cert.getEncodedInternal(), cert);
return cert;
} else {
throw new IOException("Empty input");
}
} catch (IOException ioe) {
throw new CertificateException("Could not parse certificate: " +
ioe.toString(), ioe);
}
}
/**
* Read from the stream until length bytes have been read or EOF has
* been reached. Return the number of bytes actually read.
*/
private static int readFully(InputStream in, ByteArrayOutputStream bout,
int length) throws IOException {
int read = 0;
byte[] buffer = new byte[2048];
while (length > 0) {
int n = in.read(buffer, 0, length<2048?length:2048);
if (n <= 0) {
break;
}
bout.write(buffer, 0, n);
read += n;
length -= n;
}
return read;
}
/**
* Return an interned X509CertImpl for the given certificate.
* If the given X509Certificate or X509CertImpl is already present
* in the cert cache, the cached object is returned. Otherwise,
* if it is a X509Certificate, it is first converted to a X509CertImpl.
* Then the X509CertImpl is added to the cache and returned.
*
* Note that all certificates created via generateCertificate(InputStream)
* are already interned and this method does not need to be called.
* It is useful for certificates that cannot be created via
* generateCertificate() and for converting other X509Certificate
* implementations to an X509CertImpl.
*
* @param c The source X509Certificate
* @return An X509CertImpl object that is either a cached certificate or a
* newly built X509CertImpl from the provided X509Certificate
* @throws CertificateException if failures occur while obtaining the DER
* encoding for certificate data.
*/
public static synchronized X509CertImpl intern(X509Certificate c)
throws CertificateException {
if (c == null) {
return null;
}
boolean isImpl = c instanceof X509CertImpl;
byte[] encoding;
if (isImpl) {
encoding = ((X509CertImpl)c).getEncodedInternal();
} else {
encoding = c.getEncoded();
}
X509CertImpl newC = getFromCache(certCache, encoding);
if (newC != null) {
return newC;
}
if (isImpl) {
newC = (X509CertImpl)c;
} else {
newC = new X509CertImpl(encoding);
encoding = newC.getEncodedInternal();
}
addToCache(certCache, encoding, newC);
return newC;
}
/**
* Return an interned X509CRLImpl for the given certificate.
* For more information, see intern(X509Certificate).
*
* @param c The source X509CRL
* @return An X509CRLImpl object that is either a cached CRL or a
* newly built X509CRLImpl from the provided X509CRL
* @throws CRLException if failures occur while obtaining the DER
* encoding for CRL data.
*/
public static synchronized X509CRLImpl intern(X509CRL c)
throws CRLException {
if (c == null) {
return null;
}
boolean isImpl = c instanceof X509CRLImpl;
byte[] encoding;
if (isImpl) {
encoding = ((X509CRLImpl)c).getEncodedInternal();
} else {
encoding = c.getEncoded();
}
X509CRLImpl newC = getFromCache(crlCache, encoding);
if (newC != null) {
return newC;
}
if (isImpl) {
newC = (X509CRLImpl)c;
} else {
newC = new X509CRLImpl(encoding);
encoding = newC.getEncodedInternal();
}
addToCache(crlCache, encoding, newC);
return newC;
}
/**
* Get the X509CertImpl or X509CRLImpl from the cache.
*/
private static synchronized <K,V> V getFromCache(Cache<K,V> cache,
byte[] encoding) {
Object key = new Cache.EqualByteArray(encoding);
return cache.get(key);
}
/**
* Add the X509CertImpl or X509CRLImpl to the cache.
*/
private static synchronized <V> void addToCache(Cache<Object, V> cache,
byte[] encoding, V value) {
if (encoding.length > ENC_MAX_LENGTH) {
return;
}
Object key = new Cache.EqualByteArray(encoding);
cache.put(key, value);
}
/**
* Generates a <code>CertPath</code> object and initializes it with
* the data read from the <code>InputStream</code> inStream. The data
* is assumed to be in the default encoding.
*
* @param inStream an <code>InputStream</code> containing the data
* @return a <code>CertPath</code> initialized with the data from the
* <code>InputStream</code>
* @exception CertificateException if an exception occurs while decoding
* @since 1.4
*/
@Override
public CertPath engineGenerateCertPath(InputStream inStream)
throws CertificateException
{
if (inStream == null) {
throw new CertificateException("Missing input stream");
}
try {
byte[] encoding = readOneBlock(inStream);
if (encoding != null) {
return new X509CertPath(new ByteArrayInputStream(encoding));
} else {
throw new IOException("Empty input");
}
} catch (IOException ioe) {
throw new CertificateException(ioe.getMessage());
}
}
/**
* Generates a <code>CertPath</code> object and initializes it with
* the data read from the <code>InputStream</code> inStream. The data
* is assumed to be in the specified encoding.
*
* @param inStream an <code>InputStream</code> containing the data
* @param encoding the encoding used for the data
* @return a <code>CertPath</code> initialized with the data from the
* <code>InputStream</code>
* @exception CertificateException if an exception occurs while decoding or
* the encoding requested is not supported
* @since 1.4
*/
@Override
public CertPath engineGenerateCertPath(InputStream inStream,
String encoding) throws CertificateException
{
if (inStream == null) {
throw new CertificateException("Missing input stream");
}
try {
byte[] data = readOneBlock(inStream);
if (data != null) {
return new X509CertPath(new ByteArrayInputStream(data), encoding);
} else {
throw new IOException("Empty input");
}
} catch (IOException ioe) {
throw new CertificateException(ioe.getMessage());
}
}
/**
* Generates a <code>CertPath</code> object and initializes it with
* a <code>List</code> of <code>Certificate</code>s.
* <p>
* The certificates supplied must be of a type supported by the
* <code>CertificateFactory</code>. They will be copied out of the supplied
* <code>List</code> object.
*
* @param certificates a <code>List</code> of <code>Certificate</code>s
* @return a <code>CertPath</code> initialized with the supplied list of
* certificates
* @exception CertificateException if an exception occurs
* @since 1.4
*/
@Override
public CertPath
engineGenerateCertPath(List<? extends Certificate> certificates)
throws CertificateException
{
return(new X509CertPath(certificates));
}
/**
* Returns an iteration of the <code>CertPath</code> encodings supported
* by this certificate factory, 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
* <code>CertPath</code> encodings (as <code>String</code>s)
* @since 1.4
*/
@Override
public Iterator<String> engineGetCertPathEncodings() {
return(X509CertPath.getEncodingsStatic());
}
/**
* Returns a (possibly empty) collection view of X.509 certificates read
* from the given input stream <code>is</code>.
*
* @param is the input stream with the certificates.
*
* @return a (possibly empty) collection view of X.509 certificate objects
* initialized with the data from the input stream.
*
* @exception CertificateException on parsing errors.
*/
@Override
public Collection<? extends java.security.cert.Certificate>
engineGenerateCertificates(InputStream is)
throws CertificateException {
if (is == null) {
throw new CertificateException("Missing input stream");
}
try {
return parseX509orPKCS7Cert(is);
} catch (IOException ioe) {
throw new CertificateException(ioe);
}
}
/**
* Generates an X.509 certificate revocation list (CRL) object and
* initializes it with the data read from the given input stream
* <code>is</code>.
*
* @param is an input stream with the CRL data.
*
* @return an X.509 CRL object initialized with the data
* from the input stream.
*
* @exception CRLException on parsing errors.
*/
@Override
public CRL engineGenerateCRL(InputStream is)
throws CRLException
{
if (is == null) {
// clear the cache (for debugging)
crlCache.clear();
throw new CRLException("Missing input stream");
}
try {
byte[] encoding = readOneBlock(is);
if (encoding != null) {
X509CRLImpl crl = getFromCache(crlCache, encoding);
if (crl != null) {
return crl;
}
crl = new X509CRLImpl(encoding);
addToCache(crlCache, crl.getEncodedInternal(), crl);
return crl;
} else {
throw new IOException("Empty input");
}
} catch (IOException ioe) {
throw new CRLException(ioe.getMessage());
}
}
/**
* Returns a (possibly empty) collection view of X.509 CRLs read
* from the given input stream <code>is</code>.
*
* @param is the input stream with the CRLs.
*
* @return a (possibly empty) collection view of X.509 CRL objects
* initialized with the data from the input stream.
*
* @exception CRLException on parsing errors.
*/
@Override
public Collection<? extends java.security.cert.CRL> engineGenerateCRLs(
InputStream is) throws CRLException
{
if (is == null) {
throw new CRLException("Missing input stream");
}
try {
return parseX509orPKCS7CRL(is);
} catch (IOException ioe) {
throw new CRLException(ioe.getMessage());
}
}
/*
* Parses the data in the given input stream as a sequence of DER
* encoded X.509 certificates (in binary or base 64 encoded format) OR
* as a single PKCS#7 encoded blob (in binary or base64 encoded format).
*/
private Collection<? extends java.security.cert.Certificate>
parseX509orPKCS7Cert(InputStream is)
throws CertificateException, IOException
{
int peekByte;
byte[] data;
PushbackInputStream pbis = new PushbackInputStream(is);
Collection<X509CertImpl> coll = new ArrayList<>();
// Test the InputStream for end-of-stream. If the stream's
// initial state is already at end-of-stream then return
// an empty collection. Otherwise, push the byte back into the
// stream and let readOneBlock look for the first certificate.
peekByte = pbis.read();
if (peekByte == -1) {
return new ArrayList<>(0);
} else {
pbis.unread(peekByte);
data = readOneBlock(pbis);
}
// If we end up with a null value after reading the first block
// then we know the end-of-stream has been reached and no certificate
// data has been found.
if (data == null) {
throw new CertificateException("No certificate data found");
}
try {
PKCS7 pkcs7 = new PKCS7(data);
X509Certificate[] certs = pkcs7.getCertificates();
// certs are optional in PKCS #7
if (certs != null) {
return Arrays.asList(certs);
} else {
// no certificates provided
return new ArrayList<>(0);
}
} catch (ParsingException e) {
while (data != null) {
coll.add(new X509CertImpl(data));
data = readOneBlock(pbis);
}
}
return coll;
}
/*
* Parses the data in the given input stream as a sequence of DER encoded
* X.509 CRLs (in binary or base 64 encoded format) OR as a single PKCS#7
* encoded blob (in binary or base 64 encoded format).
*/
private Collection<? extends java.security.cert.CRL>
parseX509orPKCS7CRL(InputStream is)
throws CRLException, IOException
{
int peekByte;
byte[] data;
PushbackInputStream pbis = new PushbackInputStream(is);
Collection<X509CRLImpl> coll = new ArrayList<>();
// Test the InputStream for end-of-stream. If the stream's
// initial state is already at end-of-stream then return
// an empty collection. Otherwise, push the byte back into the
// stream and let readOneBlock look for the first CRL.
peekByte = pbis.read();
if (peekByte == -1) {
return new ArrayList<>(0);
} else {
pbis.unread(peekByte);
data = readOneBlock(pbis);
}
// If we end up with a null value after reading the first block
// then we know the end-of-stream has been reached and no CRL
// data has been found.
if (data == null) {
throw new CRLException("No CRL data found");
}
try {
PKCS7 pkcs7 = new PKCS7(data);
X509CRL[] crls = pkcs7.getCRLs();
// CRLs are optional in PKCS #7
if (crls != null) {
return Arrays.asList(crls);
} else {
// no crls provided
return new ArrayList<>(0);
}
} catch (ParsingException e) {
while (data != null) {
coll.add(new X509CRLImpl(data));
data = readOneBlock(pbis);
}
}
return coll;
}
/**
* Returns an ASN.1 SEQUENCE from a stream, which might be a BER-encoded
* binary block or a PEM-style BASE64-encoded ASCII data. In the latter
* case, it's de-BASE64'ed before return.
*
* After the reading, the input stream pointer is after the BER block, or
* after the newline character after the -----END SOMETHING----- line.
*
* @param is the InputStream
* @returns byte block or null if end of stream
* @throws IOException If any parsing error
*/
private static byte[] readOneBlock(InputStream is) throws IOException {
// The first character of a BLOCK.
int c = is.read();
if (c == -1) {
return null;
}
if (c == DerValue.tag_Sequence) {
ByteArrayOutputStream bout = new ByteArrayOutputStream(2048);
bout.write(c);
readBERInternal(is, bout, c);
return bout.toByteArray();
} else {
// Read BASE64 encoded data, might skip info at the beginning
char[] data = new char[2048];
int pos = 0;
// Step 1: Read until header is found
int hyphen = (c=='-') ? 1: 0; // count of consequent hyphens
int last = (c=='-') ? -1: c; // the char before hyphen
while (true) {
int next = is.read();
if (next == -1) {
// We accept useless data after the last block,
// say, empty lines.
return null;
}
if (next == '-') {
hyphen++;
} else {
hyphen = 0;
last = next;
}
if (hyphen == 5 && (last == -1 || last == '\r' || last == '\n')) {
break;
}
}
// Step 2: Read the rest of header, determine the line end
int end;
StringBuilder header = new StringBuilder("-----");
while (true) {
int next = is.read();
if (next == -1) {
throw new IOException("Incomplete data");
}
if (next == '\n') {
end = '\n';
break;
}
if (next == '\r') {
next = is.read();
if (next == -1) {
throw new IOException("Incomplete data");
}
if (next == '\n') {
end = '\n';
} else {
end = '\r';
data[pos++] = (char)next;
}
break;
}
header.append((char)next);
}
// Step 3: Read the data
while (true) {
int next = is.read();
if (next == -1) {
throw new IOException("Incomplete data");
}
if (next != '-') {
data[pos++] = (char)next;
if (pos >= data.length) {
data = Arrays.copyOf(data, data.length+1024);
}
} else {
break;
}
}
// Step 4: Consume the footer
StringBuilder footer = new StringBuilder("-");
while (true) {
int next = is.read();
// Add next == '\n' for maximum safety, in case endline
// is not consistent.
if (next == -1 || next == end || next == '\n') {
break;
}
if (next != '\r') footer.append((char)next);
}
checkHeaderFooter(header.toString(), footer.toString());
return Base64.getMimeDecoder().decode(new String(data, 0, pos));
}
}
private static void checkHeaderFooter(String header,
String footer) throws IOException {
if (header.length() < 16 || !header.startsWith("-----BEGIN ") ||
!header.endsWith("-----")) {
throw new IOException("Illegal header: " + header);
}
if (footer.length() < 14 || !footer.startsWith("-----END ") ||
!footer.endsWith("-----")) {
throw new IOException("Illegal footer: " + footer);
}
String headerType = header.substring(11, header.length()-5);
String footerType = footer.substring(9, footer.length()-5);
if (!headerType.equals(footerType)) {
throw new IOException("Header and footer do not match: " +
header + " " + footer);
}
}
/**
* Read one BER data block. This method is aware of indefinite-length BER
* encoding and will read all of the sub-sections in a recursive way
*
* @param is Read from this InputStream
* @param bout Write into this OutputStream
* @param tag Tag already read (-1 mean not read)
* @returns The current tag, used to check EOC in indefinite-length BER
* @throws IOException Any parsing error
*/
private static int readBERInternal(InputStream is,
ByteArrayOutputStream bout, int tag) throws IOException {
if (tag == -1) { // Not read before the call, read now
tag = is.read();
if (tag == -1) {
throw new IOException("BER/DER tag info absent");
}
if ((tag & 0x1f) == 0x1f) {
throw new IOException("Multi octets tag not supported");
}
bout.write(tag);
}
int n = is.read();
if (n == -1) {
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