private void responseToChallenge(ByteBuffer buf, Link link) {
// Challenge is exactly 16 bytes long
if (!cap(buf, 16, 16, link, true)) return;
ByteBuffer challenge = buf.slice(buf.cursor, 16, true);
buf.unref();
// Encode challenge with password
ByteBuffer response;
try {
response = encodePassword(challenge, password);
challenge.unref();
} catch (Exception e) {
throw new RuntimeException(
"Cannot encrypt client password to send to server: " + e.getMessage());
}
if (verbose) {
response.putMetadata("sender", this);
}
// Send encoded challenge
nextStage();
pushDataToOTOut(response);
}
private void handleCredSSP(ByteBuffer buf, Link link) {
if (verbose) System.out.println("[" + this + "] INFO: CredSSP data received: " + buf + ".");
// Store header position: will parse whole header later in BER format parser
int headerPosition = buf.cursor - 1;
long payloadLength = buf.readBerLength();
if (payloadLength > 10 * 1024)
throw new RuntimeException(
"["
+ this
+ "] ERROR: CredSSP packets seems to be too long: "
+ payloadLength
+ "bytes. Data: "
+ buf
+ ".");
// Length is the size of payload, so we need to append size of header
int headerLength = buf.cursor - headerPosition;
int packetLength = (int) payloadLength + headerLength;
if (!cap(buf, packetLength, packetLength, link, false))
// Wait for full packet to arrive
return;
// Extract payload (with header)
ByteBuffer outBuf = buf.slice(headerPosition, packetLength, true);
buf.unref();
if (verbose) {
outBuf.putMetadata("source", this);
}
pushDataToPad(CREDSSP_PAD, outBuf);
}
private void handleTpkt(ByteBuffer buf, Link link) {
// Reserved
buf.skipBytes(1);
// Read TPKT length
int length = buf.readUnsignedShort();
if (!cap(buf, length, length, link, false))
// Wait for full packet to arrive
return;
int payloadLength = length - buf.cursor;
// Extract payload
ByteBuffer outBuf = buf.slice(buf.cursor, payloadLength, true);
buf.unref();
if (verbose) {
outBuf.putMetadata("source", this);
}
pushDataToPad(TPKT_PAD, outBuf);
}
private void handleFastPath(ByteBuffer buf, Link link, int typeAndFlags) {
// Number of bytes in updateData field (including header (1+1 or 2
// bytes))
int length = buf.readVariableUnsignedShort();
if (!cap(buf, length, length, link, false))
// Wait for full packet to arrive
return;
int type = typeAndFlags & 0x3;
int securityFlags = (typeAndFlags >> 6) & 0x3;
// Assertions
{
if (type != PROTOCOL_FASTPATH)
throw new RuntimeException(
"Unknown protocol. Expected protocol: 0 (FastPath). Actual protocol: "
+ type
+ ", data: "
+ buf
+ ".");
switch (securityFlags) {
case FASTPATH_OUTPUT_SECURE_CHECKSUM:
// TODO
throw new RuntimeException("Secure checksum is not supported in FastPath packets.");
case FASTPATH_OUTPUT_ENCRYPTED:
// TODO
throw new RuntimeException("Encryption is not supported in FastPath packets.");
}
}
// TODO: optional FIPS information, when FIPS is selected
// TODO: optional data signature (checksum), when checksum or FIPS is
// selected
// Array of FastPath update fields
while (buf.cursor < buf.length) {
int updateHeader = buf.readUnsignedByte();
int size = buf.readUnsignedShortLE();
int updateCode = updateHeader & 0xf;
int fragmentation = (updateHeader >> 4) & 0x3;
int compression = (updateHeader >> 6) & 0x3;
if (verbose)
System.out.println(
"["
+ this
+ "] INFO: FastPath update received. UpdateCode: "
+ updateCode
+ ", fragmentation: "
+ fragmentation
+ ", compression: "
+ compression
+ ", size: "
+ size
+ ".");
ByteBuffer data = buf.readBytes(size);
buf.putMetadata("fragmentation", fragmentation);
buf.putMetadata("compression", compression);
switch (updateCode) {
case FASTPATH_UPDATETYPE_ORDERS:
if (verbose) System.out.println("[" + this + "] INFO: FASTPATH_UPDATETYPE_ORDERS.");
pushDataToPad(ORDERS_PAD, data);
break;
case FASTPATH_UPDATETYPE_BITMAP:
if (verbose) System.out.println("[" + this + "] INFO: FASTPATH_UPDATETYPE_BITMAP.");
pushDataToPad(BITMAP_PAD, data);
break;
case FASTPATH_UPDATETYPE_PALETTE:
if (verbose) System.out.println("[" + this + "] INFO: FASTPATH_UPDATETYPE_PALETTE.");
pushDataToPad(PALETTE_PAD, data);
break;
case FASTPATH_UPDATETYPE_SYNCHRONIZE:
// @see http://msdn.microsoft.com/en-us/library/cc240625.aspx
if (verbose) System.out.println("[" + this + "] INFO: FASTPATH_UPDATETYPE_SYNCHRONIZE.");
data.unref();
if (size != 0)
throw new RuntimeException(
"Size of FastPath synchronize packet must be 0. UpdateCode: "
+ updateCode
+ ", fragmentation: "
+ fragmentation
+ ", compression: "
+ compression
+ ", size: "
+ size
+ ", data: "
+ data
+ ".");
break;
case FASTPATH_UPDATETYPE_SURFCMDS:
if (verbose) System.out.println("[" + this + "] INFO: FASTPATH_UPDATETYPE_SURFCMDS.");
break;
case FASTPATH_UPDATETYPE_PTR_NULL:
if (verbose) System.out.println("[" + this + "] INFO: FASTPATH_UPDATETYPE_PTR_NULL.");
break;
case FASTPATH_UPDATETYPE_PTR_DEFAULT:
if (verbose) System.out.println("[" + this + "] INFO: FASTPATH_UPDATETYPE_PTR_DEFAULT.");
break;
case FASTPATH_UPDATETYPE_PTR_POSITION:
if (verbose) System.out.println("[" + this + "] INFO: FASTPATH_UPDATETYPE_PTR_POSITION.");
break;
case FASTPATH_UPDATETYPE_COLOR:
if (verbose) System.out.println("[" + this + "] INFO: FASTPATH_UPDATETYPE_COLOR.");
break;
case FASTPATH_UPDATETYPE_CACHED:
if (verbose) System.out.println("[" + this + "] INFO: FASTPATH_UPDATETYPE_CACHED.");
break;
case FASTPATH_UPDATETYPE_POINTER:
if (verbose) System.out.println("[" + this + "] INFO: FASTPATH_UPDATETYPE_POINTER.");
break;
default:
throw new RuntimeException(
"Unknown FastPath update. UpdateCode: "
+ updateCode
+ ", fragmentation: "
+ fragmentation
+ ", compression: "
+ compression
+ ", size: "
+ size
+ ", data: "
+ data
+ ".");
}
buf.unref();
}
}
