def parseConferenceCreateRequest(
self, stream: BytesIO) -> GCCConferenceCreateRequestPDU:
"""
Parse ConferenceCreateRequest data into a GCCPDU
:param stream: byte stream containing the PDU data
"""
prop = per.readSelection(stream)
if prop != 8:
raise ParsingError(
"Expected property to be 8 (conference name), got %d" % prop)
conferenceName = per.readNumericString(stream, 1)
stream.read(1)
userDataCount = per.readNumberOfSet(stream)
if userDataCount != 1:
raise ParsingError("Expected user data count to be 1, got %d" %
userDataCount)
userDataType = per.readChoice(stream)
if userDataType != 0xc0:
raise ParsingError(
"Expected user data type to be 0xc0 (h221NonStandard), got %d"
% userDataType)
key = per.readOctetStream(stream, 4)
if key != GCCParser.H221_CLIENT_KEY:
raise ParsingError("Expected user data key to be %s, got %s" %
(GCCParser.H221_CLIENT_KEY, key))
payload = per.readOctetStream(stream)
return GCCConferenceCreateRequestPDU(conferenceName, payload)
def onConnectInitial(self, pdu: MCSConnectInitialPDU):
"""
Parse client connection information, change some settings, disable some unimplemented features, and record
the client data.
:param pdu: the connect initial PDU
"""
gccParser = GCCParser()
rdpClientConnectionParser = ClientConnectionParser()
gccConferenceCreateRequestPDU: GCCConferenceCreateRequestPDU = gccParser.parse(
pdu.payload)
rdpClientDataPDU = rdpClientConnectionParser.parse(
gccConferenceCreateRequestPDU.payload)
# FIPS is not implemented, so remove this flag if it's set
rdpClientDataPDU.securityData.encryptionMethods &= ~EncryptionMethod.ENCRYPTION_FIPS
rdpClientDataPDU.securityData.extEncryptionMethods &= ~EncryptionMethod.ENCRYPTION_FIPS
if self.state.config.downgrade:
# This disables the support for the Graphics pipeline extension, which is a completely different way to
# transfer graphics from server to client. https://msdn.microsoft.com/en-us/library/dn366933.aspx
rdpClientDataPDU.coreData.earlyCapabilityFlags &= ~ClientCapabilityFlag.RNS_UD_CS_SUPPORT_DYNVC_GFX_PROTOCOL
# Remove 24bpp and 32bpp support, fall back to 16bpp.
# 2018-12-14: This is only there because there is a bug in the pyrdp player where 24bpp
# decompression in rle.c causes random crashes. If this bug is fixed, we could remove this.
rdpClientDataPDU.coreData.supportedColorDepths &= ~SupportedColorDepth.RNS_UD_32BPP_SUPPORT
rdpClientDataPDU.coreData.supportedColorDepths &= ~SupportedColorDepth.RNS_UD_24BPP_SUPPORT
rdpClientDataPDU.coreData.highColorDepth &= ~HighColorDepth.HIGH_COLOR_24BPP
if rdpClientDataPDU.coreData.highColorDepth == 0:
# Means the requested color depth was 24bpp, fallback to 16bpp
rdpClientDataPDU.coreData.highColorDepth |= HighColorDepth.HIGH_COLOR_16BPP
rdpClientDataPDU.coreData.earlyCapabilityFlags &= ~ClientCapabilityFlag.RNS_UD_CS_WANT_32BPP_SESSION
self.recorder.record(rdpClientDataPDU, PlayerPDUType.CLIENT_DATA)
if rdpClientDataPDU.networkData:
self.state.channelDefinitions = rdpClientDataPDU.networkData.channelDefinitions
if "MS_T120" in map(
lambda channelDef: channelDef.name,
rdpClientDataPDU.networkData.channelDefinitions):
self.log.info(
"Bluekeep (CVE-2019-0708) scan or exploit attempt detected.",
{"bluekeep": True})
serverGCCPDU = GCCConferenceCreateRequestPDU(
"1", rdpClientConnectionParser.write(rdpClientDataPDU))
serverMCSPDU = MCSConnectInitialPDU(pdu.callingDomain,
pdu.calledDomain, pdu.upward,
pdu.targetParams, pdu.minParams,
pdu.maxParams,
gccParser.write(serverGCCPDU))
self.log.info(
"Client hostname %(clientName)s",
{"clientName": rdpClientDataPDU.coreData.clientName.strip("\x00")})
self.server.sendPDU(serverMCSPDU)
def send(self, data):
pdu = GCCConferenceCreateRequestPDU(self.conferenceName, data)
self.previous.send(self.mainParser.write(pdu))