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The Bouncy Castle Crypto package is a Java implementation of cryptographic algorithms. This jar contains JCE provider and lightweight API for the Bouncy Castle Cryptography APIs for JDK 1.5 to JDK 1.8. Note: this package includes the NTRU encryption algorithms.
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package org.bouncycastle.crypto.tls;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.security.SecureRandom;
import java.util.Enumeration;
import java.util.Hashtable;
import java.util.Vector;
import org.bouncycastle.util.Arrays;
public class DTLSClientProtocol
extends DTLSProtocol
{
public DTLSClientProtocol(SecureRandom secureRandom)
{
super(secureRandom);
}
public DTLSTransport connect(TlsClient client, DatagramTransport transport)
throws IOException
{
if (client == null)
{
throw new IllegalArgumentException("'client' cannot be null");
}
if (transport == null)
{
throw new IllegalArgumentException("'transport' cannot be null");
}
SecurityParameters securityParameters = new SecurityParameters();
securityParameters.entity = ConnectionEnd.client;
ClientHandshakeState state = new ClientHandshakeState();
state.client = client;
state.clientContext = new TlsClientContextImpl(secureRandom, securityParameters);
securityParameters.clientRandom = TlsProtocol.createRandomBlock(client.shouldUseGMTUnixTime(),
state.clientContext.getNonceRandomGenerator());
client.init(state.clientContext);
DTLSRecordLayer recordLayer = new DTLSRecordLayer(transport, state.clientContext, client, ContentType.handshake);
TlsSession sessionToResume = state.client.getSessionToResume();
if (sessionToResume != null && sessionToResume.isResumable())
{
SessionParameters sessionParameters = sessionToResume.exportSessionParameters();
if (sessionParameters != null)
{
state.tlsSession = sessionToResume;
state.sessionParameters = sessionParameters;
}
}
try
{
return clientHandshake(state, recordLayer);
}
catch (TlsFatalAlert fatalAlert)
{
abortClientHandshake(state, recordLayer, fatalAlert.getAlertDescription());
throw fatalAlert;
}
catch (IOException e)
{
abortClientHandshake(state, recordLayer, AlertDescription.internal_error);
throw e;
}
catch (RuntimeException e)
{
abortClientHandshake(state, recordLayer, AlertDescription.internal_error);
throw new TlsFatalAlert(AlertDescription.internal_error, e);
}
finally
{
securityParameters.clear();
}
}
protected void abortClientHandshake(ClientHandshakeState state, DTLSRecordLayer recordLayer, short alertDescription)
{
recordLayer.fail(alertDescription);
invalidateSession(state);
}
protected DTLSTransport clientHandshake(ClientHandshakeState state, DTLSRecordLayer recordLayer)
throws IOException
{
SecurityParameters securityParameters = state.clientContext.getSecurityParameters();
DTLSReliableHandshake handshake = new DTLSReliableHandshake(state.clientContext, recordLayer);
byte[] clientHelloBody = generateClientHello(state, state.client);
recordLayer.setWriteVersion(ProtocolVersion.DTLSv10);
handshake.sendMessage(HandshakeType.client_hello, clientHelloBody);
DTLSReliableHandshake.Message serverMessage = handshake.receiveMessage();
while (serverMessage.getType() == HandshakeType.hello_verify_request)
{
ProtocolVersion recordLayerVersion = recordLayer.getReadVersion();
ProtocolVersion client_version = state.clientContext.getClientVersion();
/*
* RFC 6347 4.2.1 DTLS 1.2 server implementations SHOULD use DTLS version 1.0 regardless of
* the version of TLS that is expected to be negotiated. DTLS 1.2 and 1.0 clients MUST use
* the version solely to indicate packet formatting (which is the same in both DTLS 1.2 and
* 1.0) and not as part of version negotiation.
*/
if (!recordLayerVersion.isEqualOrEarlierVersionOf(client_version))
{
throw new TlsFatalAlert(AlertDescription.illegal_parameter);
}
recordLayer.setReadVersion(null);
byte[] cookie = processHelloVerifyRequest(state, serverMessage.getBody());
byte[] patched = patchClientHelloWithCookie(clientHelloBody, cookie);
handshake.resetHandshakeMessagesDigest();
handshake.sendMessage(HandshakeType.client_hello, patched);
serverMessage = handshake.receiveMessage();
}
if (serverMessage.getType() == HandshakeType.server_hello)
{
ProtocolVersion recordLayerVersion = recordLayer.getReadVersion();
reportServerVersion(state, recordLayerVersion);
recordLayer.setWriteVersion(recordLayerVersion);
processServerHello(state, serverMessage.getBody());
}
else
{
throw new TlsFatalAlert(AlertDescription.unexpected_message);
}
handshake.notifyHelloComplete();
applyMaxFragmentLengthExtension(recordLayer, securityParameters.maxFragmentLength);
if (state.resumedSession)
{
securityParameters.masterSecret = Arrays.clone(state.sessionParameters.getMasterSecret());
recordLayer.initPendingEpoch(state.client.getCipher());
// NOTE: Calculated exclusive of the actual Finished message from the server
byte[] expectedServerVerifyData = TlsUtils.calculateVerifyData(state.clientContext, ExporterLabel.server_finished,
TlsProtocol.getCurrentPRFHash(state.clientContext, handshake.getHandshakeHash(), null));
processFinished(handshake.receiveMessageBody(HandshakeType.finished), expectedServerVerifyData);
// NOTE: Calculated exclusive of the Finished message itself
byte[] clientVerifyData = TlsUtils.calculateVerifyData(state.clientContext, ExporterLabel.client_finished,
TlsProtocol.getCurrentPRFHash(state.clientContext, handshake.getHandshakeHash(), null));
handshake.sendMessage(HandshakeType.finished, clientVerifyData);
handshake.finish();
state.clientContext.setResumableSession(state.tlsSession);
state.client.notifyHandshakeComplete();
return new DTLSTransport(recordLayer);
}
invalidateSession(state);
if (state.selectedSessionID.length > 0)
{
state.tlsSession = new TlsSessionImpl(state.selectedSessionID, null);
}
serverMessage = handshake.receiveMessage();
if (serverMessage.getType() == HandshakeType.supplemental_data)
{
processServerSupplementalData(state, serverMessage.getBody());
serverMessage = handshake.receiveMessage();
}
else
{
state.client.processServerSupplementalData(null);
}
state.keyExchange = state.client.getKeyExchange();
state.keyExchange.init(state.clientContext);
Certificate serverCertificate = null;
if (serverMessage.getType() == HandshakeType.certificate)
{
serverCertificate = processServerCertificate(state, serverMessage.getBody());
serverMessage = handshake.receiveMessage();
}
else
{
// Okay, Certificate is optional
state.keyExchange.skipServerCredentials();
}
// TODO[RFC 3546] Check whether empty certificates is possible, allowed, or excludes CertificateStatus
if (serverCertificate == null || serverCertificate.isEmpty())
{
state.allowCertificateStatus = false;
}
if (serverMessage.getType() == HandshakeType.certificate_status)
{
processCertificateStatus(state, serverMessage.getBody());
serverMessage = handshake.receiveMessage();
}
else
{
// Okay, CertificateStatus is optional
}
if (serverMessage.getType() == HandshakeType.server_key_exchange)
{
processServerKeyExchange(state, serverMessage.getBody());
serverMessage = handshake.receiveMessage();
}
else
{
// Okay, ServerKeyExchange is optional
state.keyExchange.skipServerKeyExchange();
}
if (serverMessage.getType() == HandshakeType.certificate_request)
{
processCertificateRequest(state, serverMessage.getBody());
/*
* TODO Give the client a chance to immediately select the CertificateVerify hash
* algorithm here to avoid tracking the other hash algorithms unnecessarily?
*/
TlsUtils.trackHashAlgorithms(handshake.getHandshakeHash(),
state.certificateRequest.getSupportedSignatureAlgorithms());
serverMessage = handshake.receiveMessage();
}
else
{
// Okay, CertificateRequest is optional
}
if (serverMessage.getType() == HandshakeType.server_hello_done)
{
if (serverMessage.getBody().length != 0)
{
throw new TlsFatalAlert(AlertDescription.decode_error);
}
}
else
{
throw new TlsFatalAlert(AlertDescription.unexpected_message);
}
handshake.getHandshakeHash().sealHashAlgorithms();
Vector clientSupplementalData = state.client.getClientSupplementalData();
if (clientSupplementalData != null)
{
byte[] supplementalDataBody = generateSupplementalData(clientSupplementalData);
handshake.sendMessage(HandshakeType.supplemental_data, supplementalDataBody);
}
if (state.certificateRequest != null)
{
state.clientCredentials = state.authentication.getClientCredentials(state.certificateRequest);
/*
* RFC 5246 If no suitable certificate is available, the client MUST send a certificate
* message containing no certificates.
*
* NOTE: In previous RFCs, this was SHOULD instead of MUST.
*/
Certificate clientCertificate = null;
if (state.clientCredentials != null)
{
clientCertificate = state.clientCredentials.getCertificate();
}
if (clientCertificate == null)
{
clientCertificate = Certificate.EMPTY_CHAIN;
}
byte[] certificateBody = generateCertificate(clientCertificate);
handshake.sendMessage(HandshakeType.certificate, certificateBody);
}
if (state.clientCredentials != null)
{
state.keyExchange.processClientCredentials(state.clientCredentials);
}
else
{
state.keyExchange.skipClientCredentials();
}
byte[] clientKeyExchangeBody = generateClientKeyExchange(state);
handshake.sendMessage(HandshakeType.client_key_exchange, clientKeyExchangeBody);
TlsHandshakeHash prepareFinishHash = handshake.prepareToFinish();
securityParameters.sessionHash = TlsProtocol.getCurrentPRFHash(state.clientContext, prepareFinishHash, null);
TlsProtocol.establishMasterSecret(state.clientContext, state.keyExchange);
recordLayer.initPendingEpoch(state.client.getCipher());
if (state.clientCredentials != null && state.clientCredentials instanceof TlsSignerCredentials)
{
TlsSignerCredentials signerCredentials = (TlsSignerCredentials)state.clientCredentials;
/*
* RFC 5246 4.7. digitally-signed element needs SignatureAndHashAlgorithm from TLS 1.2
*/
SignatureAndHashAlgorithm signatureAndHashAlgorithm = TlsUtils.getSignatureAndHashAlgorithm(
state.clientContext, signerCredentials);
byte[] hash;
if (signatureAndHashAlgorithm == null)
{
hash = securityParameters.getSessionHash();
}
else
{
hash = prepareFinishHash.getFinalHash(signatureAndHashAlgorithm.getHash());
}
byte[] signature = signerCredentials.generateCertificateSignature(hash);
DigitallySigned certificateVerify = new DigitallySigned(signatureAndHashAlgorithm, signature);
byte[] certificateVerifyBody = generateCertificateVerify(state, certificateVerify);
handshake.sendMessage(HandshakeType.certificate_verify, certificateVerifyBody);
}
// NOTE: Calculated exclusive of the Finished message itself
byte[] clientVerifyData = TlsUtils.calculateVerifyData(state.clientContext, ExporterLabel.client_finished,
TlsProtocol.getCurrentPRFHash(state.clientContext, handshake.getHandshakeHash(), null));
handshake.sendMessage(HandshakeType.finished, clientVerifyData);
if (state.expectSessionTicket)
{
serverMessage = handshake.receiveMessage();
if (serverMessage.getType() == HandshakeType.session_ticket)
{
processNewSessionTicket(state, serverMessage.getBody());
}
else
{
throw new TlsFatalAlert(AlertDescription.unexpected_message);
}
}
// NOTE: Calculated exclusive of the actual Finished message from the server
byte[] expectedServerVerifyData = TlsUtils.calculateVerifyData(state.clientContext, ExporterLabel.server_finished,
TlsProtocol.getCurrentPRFHash(state.clientContext, handshake.getHandshakeHash(), null));
processFinished(handshake.receiveMessageBody(HandshakeType.finished), expectedServerVerifyData);
handshake.finish();
if (state.tlsSession != null)
{
state.sessionParameters = new SessionParameters.Builder()
.setCipherSuite(securityParameters.getCipherSuite())
.setCompressionAlgorithm(securityParameters.getCompressionAlgorithm())
.setMasterSecret(securityParameters.getMasterSecret())
.setPeerCertificate(serverCertificate)
.setPSKIdentity(securityParameters.getPSKIdentity())
.setSRPIdentity(securityParameters.getSRPIdentity())
// TODO Consider filtering extensions that aren't relevant to resumed sessions
.setServerExtensions(state.serverExtensions)
.build();
state.tlsSession = TlsUtils.importSession(state.tlsSession.getSessionID(), state.sessionParameters);
state.clientContext.setResumableSession(state.tlsSession);
}
state.client.notifyHandshakeComplete();
return new DTLSTransport(recordLayer);
}
protected byte[] generateCertificateVerify(ClientHandshakeState state, DigitallySigned certificateVerify)
throws IOException
{
ByteArrayOutputStream buf = new ByteArrayOutputStream();
certificateVerify.encode(buf);
return buf.toByteArray();
}
protected byte[] generateClientHello(ClientHandshakeState state, TlsClient client)
throws IOException
{
ByteArrayOutputStream buf = new ByteArrayOutputStream();
ProtocolVersion client_version = client.getClientVersion();
if (!client_version.isDTLS())
{
throw new TlsFatalAlert(AlertDescription.internal_error);
}
TlsClientContextImpl context = state.clientContext;
context.setClientVersion(client_version);
TlsUtils.writeVersion(client_version, buf);
SecurityParameters securityParameters = context.getSecurityParameters();
buf.write(securityParameters.getClientRandom());
// Session ID
byte[] session_id = TlsUtils.EMPTY_BYTES;
if (state.tlsSession != null)
{
session_id = state.tlsSession.getSessionID();
if (session_id == null || session_id.length > 32)
{
session_id = TlsUtils.EMPTY_BYTES;
}
}
TlsUtils.writeOpaque8(session_id, buf);
// Cookie
TlsUtils.writeOpaque8(TlsUtils.EMPTY_BYTES, buf);
boolean fallback = client.isFallback();
/*
* Cipher suites
*/
state.offeredCipherSuites = client.getCipherSuites();
// Integer -> byte[]
state.clientExtensions = client.getClientExtensions();
// Cipher Suites (and SCSV)
{
/*
* RFC 5746 3.4. The client MUST include either an empty "renegotiation_info" extension,
* or the TLS_EMPTY_RENEGOTIATION_INFO_SCSV signaling cipher suite value in the
* ClientHello. Including both is NOT RECOMMENDED.
*/
byte[] renegExtData = TlsUtils.getExtensionData(state.clientExtensions, TlsProtocol.EXT_RenegotiationInfo);
boolean noRenegExt = (null == renegExtData);
boolean noRenegSCSV = !Arrays.contains(state.offeredCipherSuites, CipherSuite.TLS_EMPTY_RENEGOTIATION_INFO_SCSV);
if (noRenegExt && noRenegSCSV)
{
// TODO Consider whether to default to a client extension instead
state.offeredCipherSuites = Arrays.append(state.offeredCipherSuites, CipherSuite.TLS_EMPTY_RENEGOTIATION_INFO_SCSV);
}
/*
* RFC 7507 4. If a client sends a ClientHello.client_version containing a lower value
* than the latest (highest-valued) version supported by the client, it SHOULD include
* the TLS_FALLBACK_SCSV cipher suite value in ClientHello.cipher_suites [..]. (The
* client SHOULD put TLS_FALLBACK_SCSV after all cipher suites that it actually intends
* to negotiate.)
*/
if (fallback && !Arrays.contains(state.offeredCipherSuites, CipherSuite.TLS_FALLBACK_SCSV))
{
state.offeredCipherSuites = Arrays.append(state.offeredCipherSuites, CipherSuite.TLS_FALLBACK_SCSV);
}
TlsUtils.writeUint16ArrayWithUint16Length(state.offeredCipherSuites, buf);
}
// TODO Add support for compression
// Compression methods
// state.offeredCompressionMethods = client.getCompressionMethods();
state.offeredCompressionMethods = new short[]{ CompressionMethod._null };
TlsUtils.writeUint8ArrayWithUint8Length(state.offeredCompressionMethods, buf);
// Extensions
if (state.clientExtensions != null)
{
TlsProtocol.writeExtensions(buf, state.clientExtensions);
}
return buf.toByteArray();
}
protected byte[] generateClientKeyExchange(ClientHandshakeState state)
throws IOException
{
ByteArrayOutputStream buf = new ByteArrayOutputStream();
state.keyExchange.generateClientKeyExchange(buf);
return buf.toByteArray();
}
protected void invalidateSession(ClientHandshakeState state)
{
if (state.sessionParameters != null)
{
state.sessionParameters.clear();
state.sessionParameters = null;
}
if (state.tlsSession != null)
{
state.tlsSession.invalidate();
state.tlsSession = null;
}
}
protected void processCertificateRequest(ClientHandshakeState state, byte[] body)
throws IOException
{
if (state.authentication == null)
{
/*
* RFC 2246 7.4.4. It is a fatal handshake_failure alert for an anonymous server to
* request client identification.
*/
throw new TlsFatalAlert(AlertDescription.handshake_failure);
}
ByteArrayInputStream buf = new ByteArrayInputStream(body);
state.certificateRequest = CertificateRequest.parse(state.clientContext, buf);
TlsProtocol.assertEmpty(buf);
state.keyExchange.validateCertificateRequest(state.certificateRequest);
}
protected void processCertificateStatus(ClientHandshakeState state, byte[] body)
throws IOException
{
if (!state.allowCertificateStatus)
{
/*
* RFC 3546 3.6. If a server returns a "CertificateStatus" message, then the
* server MUST have included an extension of type "status_request" with empty
* "extension_data" in the extended server hello..
*/
throw new TlsFatalAlert(AlertDescription.unexpected_message);
}
ByteArrayInputStream buf = new ByteArrayInputStream(body);
state.certificateStatus = CertificateStatus.parse(buf);
TlsProtocol.assertEmpty(buf);
// TODO[RFC 3546] Figure out how to provide this to the client/authentication.
}
protected byte[] processHelloVerifyRequest(ClientHandshakeState state, byte[] body)
throws IOException
{
ByteArrayInputStream buf = new ByteArrayInputStream(body);
ProtocolVersion server_version = TlsUtils.readVersion(buf);
byte[] cookie = TlsUtils.readOpaque8(buf);
TlsProtocol.assertEmpty(buf);
// TODO Seems this behaviour is not yet in line with OpenSSL for DTLS 1.2
// reportServerVersion(state, server_version);
if (!server_version.isEqualOrEarlierVersionOf(state.clientContext.getClientVersion()))
{
throw new TlsFatalAlert(AlertDescription.illegal_parameter);
}
/*
* RFC 6347 This specification increases the cookie size limit to 255 bytes for greater
* future flexibility. The limit remains 32 for previous versions of DTLS.
*/
if (!ProtocolVersion.DTLSv12.isEqualOrEarlierVersionOf(server_version) && cookie.length > 32)
{
throw new TlsFatalAlert(AlertDescription.illegal_parameter);
}
return cookie;
}
protected void processNewSessionTicket(ClientHandshakeState state, byte[] body)
throws IOException
{
ByteArrayInputStream buf = new ByteArrayInputStream(body);
NewSessionTicket newSessionTicket = NewSessionTicket.parse(buf);
TlsProtocol.assertEmpty(buf);
state.client.notifyNewSessionTicket(newSessionTicket);
}
protected Certificate processServerCertificate(ClientHandshakeState state, byte[] body)
throws IOException
{
ByteArrayInputStream buf = new ByteArrayInputStream(body);
Certificate serverCertificate = Certificate.parse(buf);
TlsProtocol.assertEmpty(buf);
state.keyExchange.processServerCertificate(serverCertificate);
state.authentication = state.client.getAuthentication();
state.authentication.notifyServerCertificate(serverCertificate);
return serverCertificate;
}
protected void processServerHello(ClientHandshakeState state, byte[] body)
throws IOException
{
SecurityParameters securityParameters = state.clientContext.getSecurityParameters();
ByteArrayInputStream buf = new ByteArrayInputStream(body);
{
ProtocolVersion server_version = TlsUtils.readVersion(buf);
reportServerVersion(state, server_version);
}
securityParameters.serverRandom = TlsUtils.readFully(32, buf);
state.selectedSessionID = TlsUtils.readOpaque8(buf);
if (state.selectedSessionID.length > 32)
{
throw new TlsFatalAlert(AlertDescription.illegal_parameter);
}
state.client.notifySessionID(state.selectedSessionID);
state.resumedSession = state.selectedSessionID.length > 0 && state.tlsSession != null
&& Arrays.areEqual(state.selectedSessionID, state.tlsSession.getSessionID());
int selectedCipherSuite = TlsUtils.readUint16(buf);
if (!Arrays.contains(state.offeredCipherSuites, selectedCipherSuite)
|| selectedCipherSuite == CipherSuite.TLS_NULL_WITH_NULL_NULL
|| CipherSuite.isSCSV(selectedCipherSuite)
|| !TlsUtils.isValidCipherSuiteForVersion(selectedCipherSuite, state.clientContext.getServerVersion()))
{
throw new TlsFatalAlert(AlertDescription.illegal_parameter);
}
validateSelectedCipherSuite(selectedCipherSuite, AlertDescription.illegal_parameter);
state.client.notifySelectedCipherSuite(selectedCipherSuite);
short selectedCompressionMethod = TlsUtils.readUint8(buf);
if (!Arrays.contains(state.offeredCompressionMethods, selectedCompressionMethod))
{
throw new TlsFatalAlert(AlertDescription.illegal_parameter);
}
state.client.notifySelectedCompressionMethod(selectedCompressionMethod);
/*
* RFC3546 2.2 The extended server hello message format MAY be sent in place of the server
* hello message when the client has requested extended functionality via the extended
* client hello message specified in Section 2.1. ... Note that the extended server hello
* message is only sent in response to an extended client hello message. This prevents the
* possibility that the extended server hello message could "break" existing TLS 1.0
* clients.
*/
/*
* TODO RFC 3546 2.3 If [...] the older session is resumed, then the server MUST ignore
* extensions appearing in the client hello, and send a server hello containing no
* extensions.
*/
// Integer -> byte[]
state.serverExtensions = TlsProtocol.readExtensions(buf);
/*
* RFC 3546 2.2 Note that the extended server hello message is only sent in response to an
* extended client hello message. However, see RFC 5746 exception below. We always include
* the SCSV, so an Extended Server Hello is always allowed.
*/
if (state.serverExtensions != null)
{
Enumeration e = state.serverExtensions.keys();
while (e.hasMoreElements())
{
Integer extType = (Integer)e.nextElement();
/*
* RFC 5746 3.6. Note that sending a "renegotiation_info" extension in response to a
* ClientHello containing only the SCSV is an explicit exception to the prohibition
* in RFC 5246, Section 7.4.1.4, on the server sending unsolicited extensions and is
* only allowed because the client is signaling its willingness to receive the
* extension via the TLS_EMPTY_RENEGOTIATION_INFO_SCSV SCSV.
*/
if (extType.equals(TlsProtocol.EXT_RenegotiationInfo))
{
continue;
}
/*
* RFC 5246 7.4.1.4 An extension type MUST NOT appear in the ServerHello unless the
* same extension type appeared in the corresponding ClientHello. If a client
* receives an extension type in ServerHello that it did not request in the
* associated ClientHello, it MUST abort the handshake with an unsupported_extension
* fatal alert.
*/
if (null == TlsUtils.getExtensionData(state.clientExtensions, extType))
{
throw new TlsFatalAlert(AlertDescription.unsupported_extension);
}
/*
* RFC 3546 2.3. If [...] the older session is resumed, then the server MUST ignore
* extensions appearing in the client hello, and send a server hello containing no
* extensions[.]
*/
if (state.resumedSession)
{
// TODO[compat-gnutls] GnuTLS test server sends server extensions e.g. ec_point_formats
// TODO[compat-openssl] OpenSSL test server sends server extensions e.g. ec_point_formats
// TODO[compat-polarssl] PolarSSL test server sends server extensions e.g. ec_point_formats
// throw new TlsFatalAlert(AlertDescription.illegal_parameter);
}
}
}
/*
* RFC 5746 3.4. Client Behavior: Initial Handshake
*/
{
/*
* When a ServerHello is received, the client MUST check if it includes the
* "renegotiation_info" extension:
*/
byte[] renegExtData = TlsUtils.getExtensionData(state.serverExtensions, TlsProtocol.EXT_RenegotiationInfo);
if (renegExtData != null)
{
/*
* If the extension is present, set the secure_renegotiation flag to TRUE. The
* client MUST then verify that the length of the "renegotiated_connection"
* field is zero, and if it is not, MUST abort the handshake (by sending a fatal
* handshake_failure alert).
*/
state.secure_renegotiation = true;
if (!Arrays.constantTimeAreEqual(renegExtData,
TlsProtocol.createRenegotiationInfo(TlsUtils.EMPTY_BYTES)))
{
throw new TlsFatalAlert(AlertDescription.handshake_failure);
}
}
}
// TODO[compat-gnutls] GnuTLS test server fails to send renegotiation_info extension when resuming
state.client.notifySecureRenegotiation(state.secure_renegotiation);
Hashtable sessionClientExtensions = state.clientExtensions, sessionServerExtensions = state.serverExtensions;
if (state.resumedSession)
{
if (selectedCipherSuite != state.sessionParameters.getCipherSuite()
|| selectedCompressionMethod != state.sessionParameters.getCompressionAlgorithm())
{
throw new TlsFatalAlert(AlertDescription.illegal_parameter);
}
sessionClientExtensions = null;
sessionServerExtensions = state.sessionParameters.readServerExtensions();
}
securityParameters.cipherSuite = selectedCipherSuite;
securityParameters.compressionAlgorithm = selectedCompressionMethod;
if (sessionServerExtensions != null)
{
{
/*
* RFC 7366 3. If a server receives an encrypt-then-MAC request extension from a client
* and then selects a stream or Authenticated Encryption with Associated Data (AEAD)
* ciphersuite, it MUST NOT send an encrypt-then-MAC response extension back to the
* client.
*/
boolean serverSentEncryptThenMAC = TlsExtensionsUtils.hasEncryptThenMACExtension(sessionServerExtensions);
if (serverSentEncryptThenMAC && !TlsUtils.isBlockCipherSuite(securityParameters.getCipherSuite()))
{
throw new TlsFatalAlert(AlertDescription.illegal_parameter);
}
securityParameters.encryptThenMAC = serverSentEncryptThenMAC;
}
securityParameters.extendedMasterSecret = TlsExtensionsUtils.hasExtendedMasterSecretExtension(sessionServerExtensions);
securityParameters.maxFragmentLength = evaluateMaxFragmentLengthExtension(state.resumedSession,
sessionClientExtensions, sessionServerExtensions, AlertDescription.illegal_parameter);
securityParameters.truncatedHMac = TlsExtensionsUtils.hasTruncatedHMacExtension(sessionServerExtensions);
/*
* TODO It's surprising that there's no provision to allow a 'fresh' CertificateStatus to be
* sent in a session resumption handshake.
*/
state.allowCertificateStatus = !state.resumedSession
&& TlsUtils.hasExpectedEmptyExtensionData(sessionServerExtensions, TlsExtensionsUtils.EXT_status_request,
AlertDescription.illegal_parameter);
state.expectSessionTicket = !state.resumedSession
&& TlsUtils.hasExpectedEmptyExtensionData(sessionServerExtensions, TlsProtocol.EXT_SessionTicket,
AlertDescription.illegal_parameter);
}
/*
* TODO[session-hash]
*
* draft-ietf-tls-session-hash-04 4. Clients and servers SHOULD NOT accept handshakes
* that do not use the extended master secret [..]. (and see 5.2, 5.3)
*/
if (sessionClientExtensions != null)
{
state.client.processServerExtensions(sessionServerExtensions);
}
securityParameters.prfAlgorithm = TlsProtocol.getPRFAlgorithm(state.clientContext,
securityParameters.getCipherSuite());
/*
* RFC 5246 7.4.9. Any cipher suite which does not explicitly specify verify_data_length has
* a verify_data_length equal to 12. This includes all existing cipher suites.
*/
securityParameters.verifyDataLength = 12;
}
protected void processServerKeyExchange(ClientHandshakeState state, byte[] body)
throws IOException
{
ByteArrayInputStream buf = new ByteArrayInputStream(body);
state.keyExchange.processServerKeyExchange(buf);
TlsProtocol.assertEmpty(buf);
}
protected void processServerSupplementalData(ClientHandshakeState state, byte[] body)
throws IOException
{
ByteArrayInputStream buf = new ByteArrayInputStream(body);
Vector serverSupplementalData = TlsProtocol.readSupplementalDataMessage(buf);
state.client.processServerSupplementalData(serverSupplementalData);
}
protected void reportServerVersion(ClientHandshakeState state, ProtocolVersion server_version)
throws IOException
{
TlsClientContextImpl clientContext = state.clientContext;
ProtocolVersion currentServerVersion = clientContext.getServerVersion();
if (null == currentServerVersion)
{
clientContext.setServerVersion(server_version);
state.client.notifyServerVersion(server_version);
}
else if (!currentServerVersion.equals(server_version))
{
throw new TlsFatalAlert(AlertDescription.illegal_parameter);
}
}
protected static byte[] patchClientHelloWithCookie(byte[] clientHelloBody, byte[] cookie)
throws IOException
{
int sessionIDPos = 34;
int sessionIDLength = TlsUtils.readUint8(clientHelloBody, sessionIDPos);
int cookieLengthPos = sessionIDPos + 1 + sessionIDLength;
int cookiePos = cookieLengthPos + 1;
byte[] patched = new byte[clientHelloBody.length + cookie.length];
System.arraycopy(clientHelloBody, 0, patched, 0, cookieLengthPos);
TlsUtils.checkUint8(cookie.length);
TlsUtils.writeUint8(cookie.length, patched, cookieLengthPos);
System.arraycopy(cookie, 0, patched, cookiePos, cookie.length);
System.arraycopy(clientHelloBody, cookiePos, patched, cookiePos + cookie.length, clientHelloBody.length
- cookiePos);
return patched;
}
protected static class ClientHandshakeState
{
TlsClient client = null;
TlsClientContextImpl clientContext = null;
TlsSession tlsSession = null;
SessionParameters sessionParameters = null;
SessionParameters.Builder sessionParametersBuilder = null;
int[] offeredCipherSuites = null;
short[] offeredCompressionMethods = null;
Hashtable clientExtensions = null;
Hashtable serverExtensions = null;
byte[] selectedSessionID = null;
boolean resumedSession = false;
boolean secure_renegotiation = false;
boolean allowCertificateStatus = false;
boolean expectSessionTicket = false;
TlsKeyExchange keyExchange = null;
TlsAuthentication authentication = null;
CertificateStatus certificateStatus = null;
CertificateRequest certificateRequest = null;
TlsCredentials clientCredentials = null;
}
}