package org.spongycastle.crypto.tls;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.security.SecureRandom;
import java.util.Enumeration;
import java.util.Hashtable;
import java.util.Vector;
import org.spongycastle.asn1.ASN1Primitive;
import org.spongycastle.asn1.x500.X500Name;
import org.spongycastle.crypto.prng.ThreadedSeedGenerator;
import org.spongycastle.util.Arrays;
/**
* An implementation of all high level protocols in TLS 1.0.
*/
public class TlsProtocolHandler
{
private static final Integer EXT_RenegotiationInfo = new Integer(ExtensionType.renegotiation_info);
/*
* Our Connection states
*/
private static final short CS_CLIENT_HELLO_SEND = 1;
private static final short CS_SERVER_HELLO_RECEIVED = 2;
private static final short CS_SERVER_CERTIFICATE_RECEIVED = 3;
private static final short CS_SERVER_KEY_EXCHANGE_RECEIVED = 4;
private static final short CS_CERTIFICATE_REQUEST_RECEIVED = 5;
private static final short CS_SERVER_HELLO_DONE_RECEIVED = 6;
private static final short CS_CLIENT_KEY_EXCHANGE_SEND = 7;
private static final short CS_CERTIFICATE_VERIFY_SEND = 8;
private static final short CS_CLIENT_CHANGE_CIPHER_SPEC_SEND = 9;
private static final short CS_CLIENT_FINISHED_SEND = 10;
private static final short CS_SERVER_CHANGE_CIPHER_SPEC_RECEIVED = 11;
private static final short CS_DONE = 12;
private static final byte[] emptybuf = new byte[0];
private static final String TLS_ERROR_MESSAGE = "Internal TLS error, this could be an attack";
/*
* Queues for data from some protocols.
*/
private ByteQueue applicationDataQueue = new ByteQueue();
private ByteQueue changeCipherSpecQueue = new ByteQueue();
private ByteQueue alertQueue = new ByteQueue();
private ByteQueue handshakeQueue = new ByteQueue();
/*
* The Record Stream we use
*/
private RecordStream rs;
private SecureRandom random;
private TlsInputStream tlsInputStream = null;
private TlsOutputStream tlsOutputStream = null;
private boolean closed = false;
private boolean failedWithError = false;
private boolean appDataReady = false;
private Hashtable clientExtensions;
private SecurityParameters securityParameters = null;
private TlsClientContextImpl tlsClientContext = null;
private TlsClient tlsClient = null;
private int[] offeredCipherSuites = null;
private short[] offeredCompressionMethods = null;
private TlsKeyExchange keyExchange = null;
private TlsAuthentication authentication = null;
private CertificateRequest certificateRequest = null;
private short connection_state = 0;
private static SecureRandom createSecureRandom()
{
/*
* We use our threaded seed generator to generate a good random seed. If the user
* has a better random seed, he should use the constructor with a SecureRandom.
*/
ThreadedSeedGenerator tsg = new ThreadedSeedGenerator();
SecureRandom random = new SecureRandom();
/*
* Hopefully, 20 bytes in fast mode are good enough.
*/
random.setSeed(tsg.generateSeed(20, true));
return random;
}
public TlsProtocolHandler(InputStream is, OutputStream os)
{
this(is, os, createSecureRandom());
}
public TlsProtocolHandler(InputStream is, OutputStream os, SecureRandom sr)
{
this.rs = new RecordStream(this, is, os);
this.random = sr;
}
protected void processData(short protocol, byte[] buf, int offset, int len) throws IOException
{
/*
* Have a look at the protocol type, and add it to the correct queue.
*/
switch (protocol)
{
case ContentType.change_cipher_spec:
changeCipherSpecQueue.addData(buf, offset, len);
processChangeCipherSpec();
break;
case ContentType.alert:
alertQueue.addData(buf, offset, len);
processAlert();
break;
case ContentType.handshake:
handshakeQueue.addData(buf, offset, len);
processHandshake();
break;
case ContentType.application_data:
if (!appDataReady)
{
this.failWithError(AlertLevel.fatal, AlertDescription.unexpected_message);
}
applicationDataQueue.addData(buf, offset, len);
processApplicationData();
break;
default:
/*
* Uh, we don't know this protocol.
*
* RFC2246 defines on page 13, that we should ignore this.
*/
}
}
private void processHandshake() throws IOException
{
boolean read;
do
{
read = false;
/*
* We need the first 4 bytes, they contain type and length of the message.
*/
if (handshakeQueue.size() >= 4)
{
byte[] beginning = new byte[4];
handshakeQueue.read(beginning, 0, 4, 0);
ByteArrayInputStream bis = new ByteArrayInputStream(beginning);
short type = TlsUtils.readUint8(bis);
int len = TlsUtils.readUint24(bis);
/*
* Check if we have enough bytes in the buffer to read the full message.
*/
if (handshakeQueue.size() >= (len + 4))
{
/*
* Read the message.
*/
byte[] buf = new byte[len];
handshakeQueue.read(buf, 0, len, 4);
handshakeQueue.removeData(len + 4);
/*
* RFC 2246 7.4.9. The value handshake_messages includes all handshake
* messages starting at client hello up to, but not including, this
* finished message. [..] Note: [Also,] Hello Request messages are
* omitted from handshake hashes.
*/
switch (type)
{
case HandshakeType.hello_request:
case HandshakeType.finished:
break;
default:
rs.updateHandshakeData(beginning, 0, 4);
rs.updateHandshakeData(buf, 0, len);
break;
}
/*
* Now, parse the message.
*/
processHandshakeMessage(type, buf);
read = true;
}
}
}
while (read);
}
private void processHandshakeMessage(short type, byte[] buf) throws IOException
{
ByteArrayInputStream is = new ByteArrayInputStream(buf);
switch (type)
{
case HandshakeType.certificate:
{
switch (connection_state)
{
case CS_SERVER_HELLO_RECEIVED:
{
// Parse the Certificate message and send to cipher suite
Certificate serverCertificate = Certificate.parse(is);
assertEmpty(is);
this.keyExchange.processServerCertificate(serverCertificate);
this.authentication = tlsClient.getAuthentication();
this.authentication.notifyServerCertificate(serverCertificate);
break;
}
default:
this.failWithError(AlertLevel.fatal, AlertDescription.unexpected_message);
}
connection_state = CS_SERVER_CERTIFICATE_RECEIVED;
break;
}
case HandshakeType.finished:
switch (connection_state)
{
case CS_SERVER_CHANGE_CIPHER_SPEC_RECEIVED:
/*
* Read the checksum from the finished message, it has always 12
* bytes for TLS 1.0 and 36 for SSLv3.
*/
boolean isTls = tlsClientContext.getServerVersion().getFullVersion() >= ProtocolVersion.TLSv10.getFullVersion();
int checksumLength = isTls ? 12 : 36;
byte[] serverVerifyData = new byte[checksumLength];
TlsUtils.readFully(serverVerifyData, is);
assertEmpty(is);
/*
* Calculate our own checksum.
*/
byte[] expectedServerVerifyData = TlsUtils.calculateVerifyData(tlsClientContext,
"server finished", rs.getCurrentHash(TlsUtils.SSL_SERVER));
/*
* Compare both checksums.
*/
if (!Arrays.constantTimeAreEqual(expectedServerVerifyData, serverVerifyData))
{
/*
* Wrong checksum in the finished message.
*/
this.failWithError(AlertLevel.fatal, AlertDescription.handshake_failure);
}
connection_state = CS_DONE;
/*
* We are now ready to receive application data.
*/
this.appDataReady = true;
break;
default:
this.failWithError(AlertLevel.fatal, AlertDescription.unexpected_message);
}
break;
case HandshakeType.server_hello:
switch (connection_state)
{
case CS_CLIENT_HELLO_SEND:
/*
* Read the server hello message
*/
ProtocolVersion server_version = TlsUtils.readVersion(is);
ProtocolVersion client_version = this.tlsClientContext.getClientVersion();
if (server_version.getFullVersion() > client_version.getFullVersion())
{
this.failWithError(AlertLevel.fatal, AlertDescription.illegal_parameter);
}
this.tlsClientContext.setServerVersion(server_version);
this.tlsClient.notifyServerVersion(server_version);
/*
* Read the server random
*/
securityParameters.serverRandom = new byte[32];
TlsUtils.readFully(securityParameters.serverRandom, is);
byte[] sessionID = TlsUtils.readOpaque8(is);
if (sessionID.length > 32)
{
this.failWithError(AlertLevel.fatal, AlertDescription.illegal_parameter);
}
this.tlsClient.notifySessionID(sessionID);
/*
* Find out which CipherSuite the server has chosen and check that
* it was one of the offered ones.
*/
int selectedCipherSuite = TlsUtils.readUint16(is);
if (!arrayContains(offeredCipherSuites, selectedCipherSuite)
|| selectedCipherSuite == CipherSuite.TLS_EMPTY_RENEGOTIATION_INFO_SCSV)
{
this.failWithError(AlertLevel.fatal, AlertDescription.illegal_parameter);
}
this.tlsClient.notifySelectedCipherSuite(selectedCipherSuite);
/*
* Find out which CompressionMethod the server has chosen and check that
* it was one of the offered ones.
*/
short selectedCompressionMethod = TlsUtils.readUint8(is);
if (!arrayContains(offeredCompressionMethods, selectedCompressionMethod))
{
this.failWithError(AlertLevel.fatal, AlertDescription.illegal_parameter);
}
this.tlsClient.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[]
Hashtable serverExtensions = new Hashtable();
if (is.available() > 0)
{
// Process extensions from extended server hello
byte[] extBytes = TlsUtils.readOpaque16(is);
ByteArrayInputStream ext = new ByteArrayInputStream(extBytes);
while (ext.available() > 0)
{
Integer extType = new Integer(TlsUtils.readUint16(ext));
byte[] extValue = TlsUtils.readOpaque16(ext);
/*
* RFC 5746 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. TLS implementations MUST continue to comply with
* Section 7.4.1.4 for all other extensions.
*/
if (!extType.equals(EXT_RenegotiationInfo)
&& clientExtensions.get(extType) == null)
{
/*
* RFC 3546 2.3 Note that for all extension types
* (including those defined in future), the extension
* type MUST NOT appear in the extended server hello
* unless the same extension type appeared in the
* corresponding client hello. Thus clients MUST abort
* the handshake if they receive an extension type in
* the extended server hello that they did not request
* in the associated (extended) client hello.
*/
this.failWithError(AlertLevel.fatal,
AlertDescription.unsupported_extension);
}
if (serverExtensions.containsKey(extType))
{
/*
* RFC 3546 2.3 Also note that when multiple
* extensions of different types are present in the
* extended client hello or the extended server hello,
* the extensions may appear in any order. There MUST
* NOT be more than one extension of the same type.
*/
this.failWithError(AlertLevel.fatal,
AlertDescription.illegal_parameter);
}
serverExtensions.put(extType, extValue);
}
}
assertEmpty(is);
/*
* RFC 5746 3.4. When a ServerHello is received, the client MUST
* check if it includes the "renegotiation_info" extension:
*/
{
boolean secure_negotiation = serverExtensions.containsKey(EXT_RenegotiationInfo);
/*
* 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).
*/
if (secure_negotiation)
{
byte[] renegExtValue = (byte[])serverExtensions.get(EXT_RenegotiationInfo);
if (!Arrays.constantTimeAreEqual(renegExtValue,
createRenegotiationInfo(emptybuf)))
{
this.failWithError(AlertLevel.fatal,
AlertDescription.handshake_failure);
}
}
tlsClient.notifySecureRenegotiation(secure_negotiation);
}
if (clientExtensions != null)
{
tlsClient.processServerExtensions(serverExtensions);
}
this.keyExchange = tlsClient.getKeyExchange();
connection_state = CS_SERVER_HELLO_RECEIVED;
break;
default:
this.failWithError(AlertLevel.fatal, AlertDescription.unexpected_message);
}
break;
case HandshakeType.server_hello_done:
switch (connection_state)
{
case CS_SERVER_HELLO_RECEIVED:
// There was no server certificate message; check it's OK
this.keyExchange.skipServerCertificate();
this.authentication = null;
// NB: Fall through to next case label
case CS_SERVER_CERTIFICATE_RECEIVED:
// There was no server key exchange message; check it's OK
this.keyExchange.skipServerKeyExchange();
// NB: Fall through to next case label
case CS_SERVER_KEY_EXCHANGE_RECEIVED:
case CS_CERTIFICATE_REQUEST_RECEIVED:
assertEmpty(is);
connection_state = CS_SERVER_HELLO_DONE_RECEIVED;
TlsCredentials clientCreds = null;
if (certificateRequest == null)
{
this.keyExchange.skipClientCredentials();
}
else
{
clientCreds = this.authentication.getClientCredentials(certificateRequest);
if (clientCreds == null)
{
this.keyExchange.skipClientCredentials();
boolean isTls = tlsClientContext.getServerVersion().getFullVersion() >= ProtocolVersion.TLSv10.getFullVersion();
if (isTls)
{
sendClientCertificate(Certificate.EMPTY_CHAIN);
}
else
{
sendAlert(AlertLevel.warning, AlertDescription.no_certificate);
}
}
else
{
this.keyExchange.processClientCredentials(clientCreds);
sendClientCertificate(clientCreds.getCertificate());
}
}
/*
* Send the client key exchange message, depending on the key
* exchange we are using in our CipherSuite.
*/
sendClientKeyExchange();
connection_state = CS_CLIENT_KEY_EXCHANGE_SEND;
/*
* Calculate the master_secret
*/
byte[] pms = this.keyExchange.generatePremasterSecret();
securityParameters.masterSecret = TlsUtils.calculateMasterSecret(
this.tlsClientContext, pms);
// TODO Is there a way to ensure the data is really overwritten?
/*
* RFC 2246 8.1. The pre_master_secret should be deleted from
* memory once the master_secret has been computed.
*/
Arrays.fill(pms, (byte)0);
if (clientCreds != null && clientCreds instanceof TlsSignerCredentials)
{
TlsSignerCredentials signerCreds = (TlsSignerCredentials)clientCreds;
byte[] md5andsha1 = rs.getCurrentHash(null);
byte[] clientCertificateSignature = signerCreds.generateCertificateSignature(
md5andsha1);
sendCertificateVerify(clientCertificateSignature);
connection_state = CS_CERTIFICATE_VERIFY_SEND;
}
/*
* Now, we send change cipher state
*/
byte[] cmessage = new byte[1];
cmessage[0] = 1;
rs.writeMessage(ContentType.change_cipher_spec, cmessage, 0,
cmessage.length);
connection_state = CS_CLIENT_CHANGE_CIPHER_SPEC_SEND;
/*
* Initialize our cipher suite
*/
rs.clientCipherSpecDecided(tlsClient.getCompression(), tlsClient.getCipher());
/*
* Send our finished message.
*/
byte[] clientVerifyData = TlsUtils.calculateVerifyData(tlsClientContext,
"client finished", rs.getCurrentHash(TlsUtils.SSL_CLIENT));
ByteArrayOutputStream bos = new ByteArrayOutputStream();
TlsUtils.writeUint8(HandshakeType.finished, bos);
TlsUtils.writeOpaque24(clientVerifyData, bos);
byte[] message = bos.toByteArray();
rs.writeMessage(ContentType.handshake, message, 0, message.length);
this.connection_state = CS_CLIENT_FINISHED_SEND;
break;
default:
this.failWithError(AlertLevel.fatal, AlertDescription.handshake_failure);
}
break;
case HandshakeType.server_key_exchange:
{
switch (connection_state)
{
case CS_SERVER_HELLO_RECEIVED:
// There was no server certificate message; check it's OK
this.keyExchange.skipServerCertificate();
this.authentication = null;
// NB: Fall through to next case label
case CS_SERVER_CERTIFICATE_RECEIVED:
this.keyExchange.processServerKeyExchange(is);
assertEmpty(is);
break;
default:
this.failWithError(AlertLevel.fatal, AlertDescription.unexpected_message);
}
this.connection_state = CS_SERVER_KEY_EXCHANGE_RECEIVED;
break;
}
case HandshakeType.certificate_request:
{
switch (connection_state)
{
case CS_SERVER_CERTIFICATE_RECEIVED:
// There was no server key exchange message; check it's OK
this.keyExchange.skipServerKeyExchange();
// NB: Fall through to next case label
case CS_SERVER_KEY_EXCHANGE_RECEIVED:
{
if (this.authentication == null)
{
/*
* RFC 2246 7.4.4. It is a fatal handshake_failure alert
* for an anonymous server to request client identification.
*/
this.failWithError(AlertLevel.fatal, AlertDescription.handshake_failure);
}
int numTypes = TlsUtils.readUint8(is);
short[] certificateTypes = new short[numTypes];
for (int i = 0; i < numTypes; ++i)
{
certificateTypes[i] = TlsUtils.readUint8(is);
}
byte[] authorities = TlsUtils.readOpaque16(is);
assertEmpty(is);
Vector authorityDNs = new Vector();
ByteArrayInputStream bis = new ByteArrayInputStream(authorities);
while (bis.available() > 0)
{
byte[] dnBytes = TlsUtils.readOpaque16(bis);
authorityDNs.addElement(X500Name.getInstance(ASN1Primitive.fromByteArray(dnBytes)));
}
this.certificateRequest = new CertificateRequest(certificateTypes,
authorityDNs);
this.keyExchange.validateCertificateRequest(this.certificateRequest);
break;
}
default:
this.failWithError(AlertLevel.fatal, AlertDescription.unexpected_message);
}
this.connection_state = CS_CERTIFICATE_REQUEST_RECEIVED;
break;
}
case HandshakeType.hello_request:
/*
* RFC 2246 7.4.1.1 Hello request This message will be ignored by the
* client if the client is currently negotiating a session. This message
* may be ignored by the client if it does not wish to renegotiate a
* session, or the client may, if it wishes, respond with a
* no_renegotiation alert.
*/
if (connection_state == CS_DONE)
{
// Renegotiation not supported yet
sendAlert(AlertLevel.warning, AlertDescription.no_renegotiation);
}
break;
case HandshakeType.client_key_exchange:
case HandshakeType.certificate_verify:
case HandshakeType.client_hello:
default:
// We do not support this!
this.failWithError(AlertLevel.fatal, AlertDescription.unexpected_message);
break;
}
}
private void processApplicationData()
{
/*
* There is nothing we need to do here.
*
* This function could be used for callbacks when application data arrives in the
* future.
*/
}
private void processAlert() throws IOException
{
while (alertQueue.size() >= 2)
{
/*
* An alert is always 2 bytes. Read the alert.
*/
byte[] tmp = new byte[2];
alertQueue.read(tmp, 0, 2, 0);
alertQueue.removeData(2);
short level = tmp[0];
short description = tmp[1];
if (level == AlertLevel.fatal)
{
/*
* This is a fatal error.
*/
this.failedWithError = true;
this.closed = true;
/*
* Now try to close the stream, ignore errors.
*/
try
{
rs.close();
}
catch (Exception e)
{
}
throw new IOException(TLS_ERROR_MESSAGE);
}
else
{
/*
* This is just a warning.
*/
if (description == AlertDescription.close_notify)
{
/*
* Close notify
*/
this.failWithError(AlertLevel.warning, AlertDescription.close_notify);
}
/*
* If it is just a warning, we continue.
*/
}
}
}
/**
* This method is called, when a change cipher spec message is received.
*
* @throws IOException If the message has an invalid content or the handshake is not
* in the correct state.
*/
private void processChangeCipherSpec() throws IOException
{
while (changeCipherSpecQueue.size() > 0)
{
/*
* A change cipher spec message is only one byte with the value 1.
*/
byte[] b = new byte[1];
changeCipherSpecQueue.read(b, 0, 1, 0);
changeCipherSpecQueue.removeData(1);
if (b[0] != 1)
{
/*
* This should never happen.
*/
this.failWithError(AlertLevel.fatal, AlertDescription.unexpected_message);
}
/*
* Check if we are in the correct connection state.
*/
if (this.connection_state != CS_CLIENT_FINISHED_SEND)
{
this.failWithError(AlertLevel.fatal, AlertDescription.handshake_failure);
}
rs.serverClientSpecReceived();
this.connection_state = CS_SERVER_CHANGE_CIPHER_SPEC_RECEIVED;
}
}
private void sendClientCertificate(Certificate clientCert) throws IOException
{
ByteArrayOutputStream bos = new ByteArrayOutputStream();
TlsUtils.writeUint8(HandshakeType.certificate, bos);
// Reserve space for length
TlsUtils.writeUint24(0, bos);
clientCert.encode(bos);
byte[] message = bos.toByteArray();
// Patch actual length back in
TlsUtils.writeUint24(message.length - 4, message, 1);
rs.writeMessage(ContentType.handshake, message, 0, message.length);
}
private void sendClientKeyExchange() throws IOException
{
ByteArrayOutputStream bos = new ByteArrayOutputStream();
TlsUtils.writeUint8(HandshakeType.client_key_exchange, bos);
// Reserve space for length
TlsUtils.writeUint24(0, bos);
this.keyExchange.generateClientKeyExchange(bos);
byte[] message = bos.toByteArray();
// Patch actual length back in
TlsUtils.writeUint24(message.length - 4, message, 1);
rs.writeMessage(ContentType.handshake, message, 0, message.length);
}
private void sendCertificateVerify(byte[] data) throws IOException
{
/*
* Send signature of handshake messages so far to prove we are the owner of the
* cert See RFC 2246 sections 4.7, 7.4.3 and 7.4.8
*/
ByteArrayOutputStream bos = new ByteArrayOutputStream();
TlsUtils.writeUint8(HandshakeType.certificate_verify, bos);
TlsUtils.writeUint24(data.length + 2, bos);
TlsUtils.writeOpaque16(data, bos);
byte[] message = bos.toByteArray();
rs.writeMessage(ContentType.handshake, message, 0, message.length);
}
/**
* Connects to the remote system.
*
* @param verifyer Will be used when a certificate is received to verify that this
* certificate is accepted by the client.
* @throws IOException If handshake was not successful.
*
* @deprecated use version taking TlsClient
*/
public void connect(CertificateVerifyer verifyer) throws IOException
{
this.connect(new LegacyTlsClient(verifyer));
}
/**
* Connects to the remote system using client authentication
*
* @param tlsClient
* @throws IOException If handshake was not successful.
*/
public void connect(TlsClient tlsClient) throws IOException
{
if (tlsClient == null)
{
throw new IllegalArgumentException("'tlsClient' cannot be null");
}
if (this.tlsClient != null)
{
throw new IllegalStateException("connect can only be called once");
}
/*
* Send Client hello
*
* First, generate some random data.
*/
this.securityParameters = new SecurityParameters();
this.securityParameters.clientRandom = new byte[32];
random.nextBytes(securityParameters.clientRandom);
TlsUtils.writeGMTUnixTime(securityParameters.clientRandom, 0);
this.tlsClientContext = new TlsClientContextImpl(random, securityParameters);
this.rs.init(tlsClientContext);
this.tlsClient = tlsClient;
this.tlsClient.init(tlsClientContext);
ByteArrayOutputStream os = new ByteArrayOutputStream();
ProtocolVersion client_version = this.tlsClient.getClientVersion();
this.tlsClientContext.setClientVersion(client_version);
// TODO For SSLv3 support, server version needs to be set to ProtocolVersion.SSLv3
this.tlsClientContext.setServerVersion(client_version);
TlsUtils.writeVersion(client_version, os);
os.write(securityParameters.clientRandom);
/*
* Length of Session id
*/
TlsUtils.writeUint8((short)0, os);
/*
* Cipher suites
*/
this.offeredCipherSuites = this.tlsClient.getCipherSuites();
// Integer -> byte[]
this.clientExtensions = this.tlsClient.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.
*/
boolean noRenegExt = clientExtensions == null
|| clientExtensions.get(EXT_RenegotiationInfo) == null;
int count = offeredCipherSuites.length;
if (noRenegExt)
{
// Note: 1 extra slot for TLS_EMPTY_RENEGOTIATION_INFO_SCSV
++count;
}
TlsUtils.writeUint16(2 * count, os);
TlsUtils.writeUint16Array(offeredCipherSuites, os);
if (noRenegExt)
{
TlsUtils.writeUint16(CipherSuite.TLS_EMPTY_RENEGOTIATION_INFO_SCSV, os);
}
}
// Compression methods
this.offeredCompressionMethods = this.tlsClient.getCompressionMethods();
TlsUtils.writeUint8((short)offeredCompressionMethods.length, os);
TlsUtils.writeUint8Array(offeredCompressionMethods, os);
// Extensions
if (clientExtensions != null)
{
ByteArrayOutputStream ext = new ByteArrayOutputStream();
Enumeration keys = clientExtensions.keys();
while (keys.hasMoreElements())
{
Integer extType = (Integer)keys.nextElement();
writeExtension(ext, extType, (byte[])clientExtensions.get(extType));
}
TlsUtils.writeOpaque16(ext.toByteArray(), os);
}
ByteArrayOutputStream bos = new ByteArrayOutputStream();
TlsUtils.writeUint8(HandshakeType.client_hello, bos);
TlsUtils.writeUint24(os.size(), bos);
bos.write(os.toByteArray());
byte[] message = bos.toByteArray();
safeWriteMessage(ContentType.handshake, message, 0, message.length);
connection_state = CS_CLIENT_HELLO_SEND;
/*
* We will now read data, until we have completed the handshake.
*/
while (connection_state != CS_DONE)
{
safeReadData();
}
this.tlsInputStream = new TlsInputStream(this);
this.tlsOutputStream = new TlsOutputStream(this);
}
/**
* Read data from the network. The method will return immediately, if there is still
* some data left in the buffer, or block until some application data has been read
* from the network.
*
* @param buf The buffer where the data will be copied to.
* @param offset The position where the data will be placed in the buffer.
* @param len The maximum number of bytes to read.
* @return The number of bytes read.
* @throws IOException If something goes wrong during reading data.
*/
protected int readApplicationData(byte[] buf, int offset, int len) throws IOException
{
while (applicationDataQueue.size() == 0)
{
/*
* We need to read some data.
*/
if (this.closed)
{
if (this.failedWithError)
{
/*
* Something went terribly wrong, we should throw an IOException
*/
throw new IOException(TLS_ERROR_MESSAGE);
}
/*
* Connection has been closed, there is no more data to read.
*/
return -1;
}
safeReadData();
}
len = Math.min(len, applicationDataQueue.size());
applicationDataQueue.read(buf, offset, len, 0);
applicationDataQueue.removeData(len);
return len;
}
private void safeReadData() throws IOException
{
try
{
rs.readData();
}
catch (TlsFatalAlert e)
{
if (!this.closed)
{
this.failWithError(AlertLevel.fatal, e.getAlertDescription());
}
throw e;
}
catch (IOException e)
{
if (!this.closed)
{
this.failWithError(AlertLevel.fatal, AlertDescription.internal_error);
}
throw e;
}
catch (RuntimeException e)
{
if (!this.closed)
{
this.failWithError(AlertLevel.fatal, AlertDescription.internal_error);
}
throw e;
}
}
private void safeWriteMessage(short type, byte[] buf, int offset, int len) throws IOException
{
try
{
rs.writeMessage(type, buf, offset, len);
}
catch (TlsFatalAlert e)
{
if (!this.closed)
{
this.failWithError(AlertLevel.fatal, e.getAlertDescription());
}
throw e;
}
catch (IOException e)
{
if (!closed)
{
this.failWithError(AlertLevel.fatal, AlertDescription.internal_error);
}
throw e;
}
catch (RuntimeException e)
{
if (!closed)
{
this.failWithError(AlertLevel.fatal, AlertDescription.internal_error);
}
throw e;
}
}
/**
* Send some application data to the remote system.
* <p/>
* The method will handle fragmentation internally.
*
* @param buf The buffer with the data.
* @param offset The position in the buffer where the data is placed.
* @param len The length of the data.
* @throws IOException If something goes wrong during sending.
*/
protected void writeData(byte[] buf, int offset, int len) throws IOException
{
if (this.closed)
{
if (this.failedWithError)
{
throw new IOException(TLS_ERROR_MESSAGE);
}
throw new IOException("Sorry, connection has been closed, you cannot write more data");
}
/*
* Protect against known IV attack!
*
* DO NOT REMOVE THIS LINE, EXCEPT YOU KNOW EXACTLY WHAT YOU ARE DOING HERE.
*/
safeWriteMessage(ContentType.application_data, emptybuf, 0, 0);
do
{
/*
* We are only allowed to write fragments up to 2^14 bytes.
*/
int toWrite = Math.min(len, 1 << 14);
safeWriteMessage(ContentType.application_data, buf, offset, toWrite);
offset += toWrite;
len -= toWrite;
}
while (len > 0);
}
/**
* @return An OutputStream which can be used to send data.
*/
public OutputStream getOutputStream()
{
return this.tlsOutputStream;
}
/**
* @return An InputStream which can be used to read data.
*/
public InputStream getInputStream()
{
return this.tlsInputStream;
}
/**
* Terminate this connection with an alert.
* <p/>
* Can be used for normal closure too.
*
* @param alertLevel The level of the alert, an be AlertLevel.fatal or AL_warning.
* @param alertDescription The exact alert message.
* @throws IOException If alert was fatal.
*/
private void failWithError(short alertLevel, short alertDescription) throws IOException
{
/*
* Check if the connection is still open.
*/
if (!closed)
{
/*
* Prepare the message
*/
this.closed = true;
if (alertLevel == AlertLevel.fatal)
{
/*
* This is a fatal message.
*/
this.failedWithError = true;
}
sendAlert(alertLevel, alertDescription);
rs.close();
if (alertLevel == AlertLevel.fatal)
{
throw new IOException(TLS_ERROR_MESSAGE);
}
}
else
{
throw new IOException(TLS_ERROR_MESSAGE);
}
}
private void sendAlert(short alertLevel, short alertDescription) throws IOException
{
byte[] error = new byte[2];
error[0] = (byte)alertLevel;
error[1] = (byte)alertDescription;
rs.writeMessage(ContentType.alert, error, 0, 2);
}
/**
* Closes this connection.
*
* @throws IOException If something goes wrong during closing.
*/
public void close() throws IOException
{
if (!closed)
{
this.failWithError(AlertLevel.warning, AlertDescription.close_notify);
}
}
/**
* Make sure the InputStream is now empty. Fail otherwise.
*
* @param is The InputStream to check.
* @throws IOException If is is not empty.
*/
protected void assertEmpty(ByteArrayInputStream is) throws IOException
{
if (is.available() > 0)
{
throw new TlsFatalAlert(AlertDescription.decode_error);
}
}
protected void flush() throws IOException
{
rs.flush();
}
private static boolean arrayContains(short[] a, short n)
{
for (int i = 0; i < a.length; ++i)
{
if (a[i] == n)
{
return true;
}
}
return false;
}
private static boolean arrayContains(int[] a, int n)
{
for (int i = 0; i < a.length; ++i)
{
if (a[i] == n)
{
return true;
}
}
return false;
}
private static byte[] createRenegotiationInfo(byte[] renegotiated_connection)
throws IOException
{
ByteArrayOutputStream buf = new ByteArrayOutputStream();
TlsUtils.writeOpaque8(renegotiated_connection, buf);
return buf.toByteArray();
}
private static void writeExtension(OutputStream output, Integer extType, byte[] extValue)
throws IOException
{
TlsUtils.writeUint16(extType.intValue(), output);
TlsUtils.writeOpaque16(extValue, output);
}
}