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package org.bouncycastle.tls;
import org.bouncycastle.tls.crypto.TlsCertificate;
import org.bouncycastle.tls.crypto.TlsCrypto;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.Map;
import java.util.Vector;
/**
* Parsing and encoding of a Certificate struct from RFC 4346.
*
* opaque ASN.1Cert<2^24-1>;
*
* struct {
* ASN.1Cert certificate_list<0..2^24-1>;
* } Certificate;
*
*
* @see org.bouncycastle.asn1.x509.Certificate
*/
public class Certificate
{
private static final TlsCertificate[] EMPTY_CERTS = new TlsCertificate[0];
private static final CertificateEntry[] EMPTY_CERT_ENTRIES = new CertificateEntry[0];
public static final Certificate EMPTY_CHAIN = new Certificate(EMPTY_CERTS);
public static final Certificate EMPTY_CHAIN_TLS13 = new Certificate(TlsUtils.EMPTY_BYTES, EMPTY_CERT_ENTRIES);
public static class ParseOptions
{
private int maxChainLength = Integer.MAX_VALUE;
private short certificateType = CertificateType.X509;
public int getMaxChainLength()
{
return maxChainLength;
}
public ParseOptions setMaxChainLength(int maxChainLength)
{
this.maxChainLength = maxChainLength;
return this;
}
public short getCertificateType()
{
return certificateType;
}
/**
* Set the {@link CertificateType} according to the IANA TLS Certificate Types registry
*/
public ParseOptions setCertificateType(short certificateType)
{
this.certificateType = certificateType;
return this;
}
}
private static CertificateEntry[] convert(TlsCertificate[] certificateList)
{
if (TlsUtils.isNullOrContainsNull(certificateList))
{
throw new NullPointerException("'certificateList' cannot be null or contain any nulls");
}
int count = certificateList.length;
CertificateEntry[] result = new CertificateEntry[count];
for (int i = 0; i < count; ++i)
{
result[i] = new CertificateEntry(certificateList[i], null);
}
return result;
}
protected final byte[] certificateRequestContext;
protected final CertificateEntry[] certificateEntryList;
protected final short certificateType;
public Certificate(TlsCertificate[] certificateList)
{
this(null, convert(certificateList));
}
public Certificate(byte[] certificateRequestContext, CertificateEntry[] certificateEntryList)
{
this(CertificateType.X509, certificateRequestContext, certificateEntryList);
}
// TODO[tls13] Prefer to manage the certificateRequestContext internally only?
public Certificate(short certificateType, byte[] certificateRequestContext, CertificateEntry[] certificateEntryList)
{
if (null != certificateRequestContext && !TlsUtils.isValidUint8(certificateRequestContext.length))
{
throw new IllegalArgumentException("'certificateRequestContext' cannot be longer than 255");
}
if (TlsUtils.isNullOrContainsNull(certificateEntryList))
{
throw new NullPointerException("'certificateEntryList' cannot be null or contain any nulls");
}
this.certificateRequestContext = TlsUtils.clone(certificateRequestContext);
this.certificateEntryList = certificateEntryList;
this.certificateType = certificateType;
}
public byte[] getCertificateRequestContext()
{
return TlsUtils.clone(certificateRequestContext);
}
/**
* @return an array of {@link org.bouncycastle.asn1.x509.Certificate} representing a certificate
* chain.
*/
public TlsCertificate[] getCertificateList()
{
return cloneCertificateList();
}
public TlsCertificate getCertificateAt(int index)
{
return certificateEntryList[index].getCertificate();
}
public CertificateEntry getCertificateEntryAt(int index)
{
return certificateEntryList[index];
}
public CertificateEntry[] getCertificateEntryList()
{
return cloneCertificateEntryList();
}
public short getCertificateType()
{
return certificateType;
}
public int getLength()
{
return certificateEntryList.length;
}
/**
* @return true if this certificate chain contains no certificates, or
* false otherwise.
*/
public boolean isEmpty()
{
return certificateEntryList.length == 0;
}
/**
* Encode this {@link Certificate} to an {@link OutputStream}, and optionally calculate the
* "end point hash" (per RFC 5929's tls-server-end-point binding).
*
* @param messageOutput the {@link OutputStream} to encode to.
* @param endPointHashOutput the {@link OutputStream} to write the "end point hash" (or null).
* @throws IOException
*/
public void encode(TlsContext context, OutputStream messageOutput, OutputStream endPointHashOutput)
throws IOException
{
final boolean isTLSv13 = TlsUtils.isTLSv13(context);
if ((null != certificateRequestContext) != isTLSv13)
{
throw new IllegalStateException();
}
if (isTLSv13)
{
TlsUtils.writeOpaque8(certificateRequestContext, messageOutput);
}
int count = certificateEntryList.length;
Vector certEncodings = new Vector(count);
Vector extEncodings = isTLSv13 ? new Vector(count) : null;
long totalLength = 0;
for (int i = 0; i < count; ++i)
{
CertificateEntry entry = certificateEntryList[i];
TlsCertificate cert = entry.getCertificate();
byte[] derEncoding = cert.getEncoded();
if (i == 0 && endPointHashOutput != null)
{
calculateEndPointHash(context, cert, derEncoding, endPointHashOutput);
}
certEncodings.addElement(derEncoding);
totalLength += derEncoding.length;
totalLength += 3;
if (isTLSv13)
{
Map extensions = entry.getExtensions();
byte[] extEncoding = (null == extensions)
? TlsUtils.EMPTY_BYTES
: TlsProtocol.writeExtensionsData(extensions);
extEncodings.addElement(extEncoding);
totalLength += extEncoding.length;
totalLength += 2;
}
}
// RFC 7250 indicates the raw key is not wrapped in a cert list like X509 is
// but RFC 8446 wraps it in a CertificateEntry, which is inside certificate_list
if (isTLSv13 || certificateType != CertificateType.RawPublicKey)
{
TlsUtils.checkUint24(totalLength);
TlsUtils.writeUint24((int)totalLength, messageOutput);
}
for (int i = 0; i < count; ++i)
{
byte[] certEncoding = (byte[])certEncodings.elementAt(i);
TlsUtils.writeOpaque24(certEncoding, messageOutput);
if (isTLSv13)
{
byte[] extEncoding = (byte[])extEncodings.elementAt(i);
TlsUtils.writeOpaque16(extEncoding, messageOutput);
}
}
}
/**
* Parse a {@link Certificate} from an {@link InputStream}.
*
* @param context
* the {@link TlsContext} of the current connection.
* @param messageInput
* the {@link InputStream} to parse from.
* @param endPointHashOutput the {@link OutputStream} to write the "end point hash" (or null).
* @return a {@link Certificate} object.
* @throws IOException
* @deprecated Use version taking a {@link ParseOptions} argument instead.
*/
public static Certificate parse(TlsContext context, InputStream messageInput, OutputStream endPointHashOutput)
throws IOException
{
return parse(new ParseOptions(), context, messageInput, endPointHashOutput);
}
/**
* Parse a {@link Certificate} from an {@link InputStream}.
*
* @param options
* the {@link ParseOptions} to apply during parsing.
* @param context
* the {@link TlsContext} of the current connection.
* @param messageInput
* the {@link InputStream} to parse from.
* @param endPointHashOutput the {@link OutputStream} to write the "end point hash" (or null).
* @return a {@link Certificate} object.
* @throws IOException
*/
public static Certificate parse(ParseOptions options, TlsContext context, InputStream messageInput,
OutputStream endPointHashOutput) throws IOException
{
final SecurityParameters securityParameters = context.getSecurityParameters();
final boolean isTLSv13 = TlsUtils.isTLSv13(securityParameters.getNegotiatedVersion());
final short certType = options.getCertificateType();
byte[] certificateRequestContext = null;
if (isTLSv13)
{
certificateRequestContext = TlsUtils.readOpaque8(messageInput);
}
int totalLength = TlsUtils.readUint24(messageInput);
if (totalLength == 0)
{
return !isTLSv13 ? EMPTY_CHAIN
: certificateRequestContext.length < 1 ? EMPTY_CHAIN_TLS13
: new Certificate(certType, certificateRequestContext, EMPTY_CERT_ENTRIES);
}
byte[] certListData = TlsUtils.readFully(totalLength, messageInput);
ByteArrayInputStream buf = new ByteArrayInputStream(certListData);
TlsCrypto crypto = context.getCrypto();
int maxChainLength = Math.max(1, options.getMaxChainLength());
Vector certificate_list = new Vector();
while (buf.available() > 0)
{
if (certificate_list.size() >= maxChainLength)
{
throw new TlsFatalAlert(AlertDescription.internal_error,
"Certificate chain longer than maximum (" + maxChainLength + ")");
}
// RFC 7250 indicates the raw key is not wrapped in a cert list like X509 is
// but RFC 8446 wraps it in a CertificateEntry, which is inside certificate_list
byte[] derEncoding;
if (isTLSv13 || certType != CertificateType.RawPublicKey)
{
derEncoding = TlsUtils.readOpaque24(buf, 1);
}
else
{
derEncoding = certListData;
buf.skip(totalLength);
}
TlsCertificate cert = crypto.createCertificate(certType, derEncoding);
if (certificate_list.isEmpty() && endPointHashOutput != null)
{
calculateEndPointHash(context, cert, derEncoding, endPointHashOutput);
}
Map extensions = null;
if (isTLSv13)
{
byte[] extEncoding = TlsUtils.readOpaque16(buf);
extensions = TlsProtocol.readExtensionsData13(HandshakeType.certificate, extEncoding);
}
certificate_list.addElement(new CertificateEntry(cert, extensions));
}
CertificateEntry[] certificateList = new CertificateEntry[certificate_list.size()];
for (int i = 0; i < certificate_list.size(); i++)
{
certificateList[i] = (CertificateEntry)certificate_list.elementAt(i);
}
return new Certificate(certType, certificateRequestContext, certificateList);
}
protected static void calculateEndPointHash(TlsContext context, TlsCertificate cert, byte[] encoding,
OutputStream output) throws IOException
{
byte[] endPointHash = TlsUtils.calculateEndPointHash(context, cert, encoding);
if (endPointHash != null && endPointHash.length > 0)
{
output.write(endPointHash);
}
}
protected TlsCertificate[] cloneCertificateList()
{
int count = certificateEntryList.length;
if (0 == count)
{
return EMPTY_CERTS;
}
TlsCertificate[] result = new TlsCertificate[count];
for (int i = 0; i < count; ++i)
{
result[i] = certificateEntryList[i].getCertificate();
}
return result;
}
protected CertificateEntry[] cloneCertificateEntryList()
{
int count = certificateEntryList.length;
if (0 == count)
{
return EMPTY_CERT_ENTRIES;
}
CertificateEntry[] result = new CertificateEntry[count];
System.arraycopy(certificateEntryList, 0, result, 0, count);
return result;
}
}