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opc_da.py
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opc_da.py
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# SPDX-License-Identifier: GPL-2.0-or-later
# This file is part of Scapy
# See https://scapy.net/ for more information
# Copyright (C) GuillaumeF <guillaume4favre@gmail.com>
# @Date: 2016-10-18
# @Last modified by: GuillaumeF
# @Last modified by: Sebastien Mainand
# @Last modified time: 2016-12-08 11:16:27
# @Last modified time: 2017-07-05
# scapy.contrib.description = OPC Data Access
# scapy.contrib.status = loads
"""
Opc Data Access
Spec: Google 'OPCDA3.00.pdf'
RPC PDU encodings:
- DCE 1.1 RPC: https://pubs.opengroup.org/onlinepubs/9629399/toc.pdf
- http://pubs.opengroup.org/onlinepubs/9629399/chap12.htm
DCOM Remote Protocol.
[MS-DCOM]: Distributed Component Object Model (DCOM) Remote Protocol
https://docs.microsoft.com/en-us/openspecs/windows_protocols/ms-dcom/4a893f3d-bd29-48cd-9f43-d9777a4415b0
XXX TODO: does not appear to have been linked to RPC
"""
import struct
from scapy.config import conf
from scapy.fields import (
BitEnumField,
ByteEnumField,
ByteField,
ConditionalField,
Field,
FieldLenField,
FlagsField,
IntEnumField,
IntField,
LEIntEnumField,
LEIntField,
LELongField,
LEShortField,
MultipleTypeField,
PacketField,
PacketLenField,
PacketListField,
ShortEnumField,
ShortField,
StrField,
StrFixedLenField,
StrLenField,
UUIDField,
_FieldContainer,
_PacketField,
)
from scapy.packet import Packet
from scapy.layers.ntlm import NTLM_Header
# Defined values
_tagOPCDataSource = {
1: "OPC_DS_CACHE",
2: "OPC_DS_DEVICE"
}
_tagOPCBrowseType = {
1: "OPC_BRANCH",
2: "OPC_LEAF",
3: "OPC_FLAT"
}
_tagOPCNameSpaceType = {
1: "OPC_NS_HIERARCHIAL",
2: "OPC_NS_FLAT"
}
_tagOPCBrowseDirection = {
1: "OPC_BROWSE_UP",
2: "OPC_BROWSE_DOWN",
3: "OPC_BROWSE_TO"
}
_tagOPCEuType = {
0: "OPC_NOENUM",
1: "OPC_ANALOG",
2: "OPC_ENUMERATED"
}
_tagOPCServerState = {
1: "OPC_STATUS_RUNNING",
2: "OPC_STATUS_FAILED",
3: "OPC_STATUS_NOCONFIG",
4: "OPC_STATUS_SUSPENDED",
5: "OPC_STATUS_TEST",
6: "OPC_STATUS_COMM_FAULT"
}
_tagOPCEnumScope = {
1: "OPC_ENUM_PRIVATE_CONNECTIONS",
2: "OPC_ENUM_PUBLIC_CONNECTIONS",
3: "OPC_ENUM_ALL_CONNECTIONS",
4: "OPC_ENUM_PRIVATE",
5: "OPC_ENUM_PUBLIC",
6: "OPC_ENUM_ALL"
}
_pfc_flags = [
"firstFragment", # First fragment
"lastFragment", # Last fragment
"pendingCancel", # Cancel was pending at sender
"reserved", #
"concurrentMultiplexing", # supports concurrent multiplexing
# of a single connection
"didNotExecute", # only meaningful on `fault' packet if true,
# guaranteed call did not execute
"maybe", # `maybe' call semantics requested
"objectUuid" # if true, a non-nil object UUID was specified
# in the handle, and is present in the optional
# object field. If false, the object field
# is omitted
]
_faultStatus = {
382312475: 'rpc_s_fault_object_not_found',
382312497: 'rpc_s_call_cancelled',
382312564: 'rpc_s_fault_addr_error',
382312565: 'rpc_s_fault_context_mismatch',
382312566: 'rpc_s_fault_fp_div_by_zero',
382312567: 'rpc_s_fault_fp_error',
382312568: 'rpc_s_fault_fp_overflow',
382312569: 'rpc_s_fault_fp_underflow',
382312570: 'rpc_s_fault_ill_inst',
382312571: 'rpc_s_fault_int_div_by_zero',
382312572: 'rpc_s_fault_int_overflow',
382312573: 'rpc_s_fault_invalid_bound',
382312574: 'rpc_s_fault_invalid_tag',
382312575: 'rpc_s_fault_pipe_closed',
382312576: 'rpc_s_fault_pipe_comm_error',
382312577: 'rpc_s_fault_pipe_discipline',
382312578: 'rpc_s_fault_pipe_empty',
382312579: 'rpc_s_fault_pipe_memory',
382312580: 'rpc_s_fault_pipe_order',
382312582: 'rpc_s_fault_remote_no_memory',
382312583: 'rpc_s_fault_unspec',
382312723: 'rpc_s_fault_user_defined',
382312726: 'rpc_s_fault_tx_open_failed',
382312814: 'rpc_s_fault_codeset_conv_error',
382312816: 'rpc_s_fault_no_client_stub',
469762049: 'nca_s_fault_int_div_by_zero',
469762050: 'nca_s_fault_addr_error',
469762051: 'nca_s_fault_fp_div_zero',
469762052: 'nca_s_fault_fp_underflow',
469762053: 'nca_s_fault_fp_overflow',
469762054: 'nca_s_fault_invalid_tag',
469762055: 'nca_s_fault_invalid_bound',
469762061: 'nca_s_fault_cancel',
469762062: 'nca_s_fault_ill_inst',
469762063: 'nca_s_fault_fp_error',
469762064: 'nca_s_fault_int_overflow',
469762068: 'nca_s_fault_pipe_empty',
469762069: 'nca_s_fault_pipe_closed',
469762070: 'nca_s_fault_pipe_order',
469762071: 'nca_s_fault_pipe_discipline',
469762072: 'nca_s_fault_pipe_comm_error',
469762073: 'nca_s_fault_pipe_memory',
469762074: 'nca_s_fault_context_mismatch',
469762075: 'nca_s_fault_remote_no_memory',
469762081: 'ncs_s_fault_user_defined',
469762082: 'nca_s_fault_tx_open_failed',
469762083: 'nca_s_fault_codeset_conv_error',
469762084: 'nca_s_fault_object_not_found',
469762085: 'nca_s_fault_no_client_stub',
}
_defResult = {
0: 'ACCEPTANCE',
1: 'USER_REJECTION',
2: 'PROVIDER_REJECTION',
}
_defReason = {
0: 'REASON_NOT_SPECIFIED',
1: 'ABSTRACT_SYNTAX_NOT_SUPPORTED',
2: 'PROPOSED_TRANSFER_SYNTAXES_NOT_SUPPORTED',
3: 'LOCAL_LIMIT_EXCEEDED',
}
_rejectBindNack = {
0: 'REASON_NOT_SPECIFIED',
1: 'TEMPORARY_CONGESTION',
2: 'LOCAL_LIMIT_EXCEEDED',
3: 'CALLED_PADDR_UNKNOWN',
4: 'PROTOCOL_VERSION_NOT_SUPPORTED',
5: 'DEFAULT_CONTEXT_NOT_SUPPORTED',
6: 'USER_DATA_NOT_READABLE',
7: 'NO_PSAP_AVAILABLE'
}
_rejectStatus = {
469762056: 'nca_rpc_version_mismatch',
469762057: 'nca_unspec_reject',
469762058: 'nca_s_bad_actid',
469762059: 'nca_who_are_you_failed',
469762060: 'nca_manager_not_entered',
469827586: 'nca_op_rng_error',
469827587: 'nca_unk_if',
469827590: 'nca_wrong_boot_time',
469827593: 'nca_s_you_crashed',
469827595: 'nca_proto_error',
469827603: 'nca_out_args_too_big',
469827604: 'nca_server_too_busy',
469827607: 'nca_unsupported_type',
469762076: 'nca_invalid_pres_context_id',
469762077: 'nca_unsupported_authn_level',
469762079: 'nca_invalid_checksum',
469762080: 'nca_invalid_crc'
}
_pduType = {
0: "REQUEST",
1: "PING",
2: "RESPONSE",
3: "FAULT",
4: "WORKING",
5: "NOCALL",
6: "REJECT",
7: "ACK",
8: "CI_CANCEL",
9: "FACK",
10: "CANCEL_ACK",
11: "BIND",
12: "BIND_ACK",
13: "BIND_NACK",
14: "ALTER_CONTEXT",
15: "ALTER_CONTEXT_RESP",
17: "SHUTDOWN",
18: "CO_CANCEL",
19: "ORPHANED",
# Not documented
16: "Auth3",
}
_authentification_protocol = {
0: 'None',
1: 'OsfDcePrivateKeyAuthentication',
}
# Util
def _make_le(pkt_cls):
"""
Make all fields in a packet LE.
"""
flds = [f.copy() for f in pkt_cls.fields_desc]
for f in flds:
if isinstance(f, _FieldContainer):
f = f.fld
if isinstance(f, UUIDField):
f.uuid_fmt = UUIDField.FORMAT_LE
elif isinstance(f, _PacketField):
f.cls = globals().get(f.cls.__name__ + "LE", f.cls)
elif not isinstance(f, StrField):
f.fmt = "<" + f.fmt.replace(">", "").replace("!", "")
f.struct = struct.Struct(f.fmt)
class LEPacket(pkt_cls):
fields_desc = flds
name = pkt_cls().name + " (LE)"
LEPacket.__name__ = pkt_cls.__name__ + "LE"
return LEPacket
# Sub class for dissection
class AuthentificationProtocol(Packet):
name = 'authentificationProtocol'
def extract_padding(self, p):
return b"", p
def guess_payload_class(self, payload):
if self.underlayer and hasattr(self.underlayer, "authLength"):
authLength = self.underlayer.authLength
if authLength != 0:
try:
return _authentification_protocol[authLength]
except Exception:
pass
return conf.raw_layer
class OsfDcePrivateKeyAuthentification(Packet):
name = "OsfDcePrivateKeyAuthentication"
# TODO
def extract_padding(self, p):
return b"", p
class OPCHandle(Packet):
def __init__(self, name, default):
Field.__init__(self, name, default, "16s")
def extract_padding(self, p):
return b"", p
class LenStringPacket(Packet):
# Among other things, can be (port_any_t - DCE 1.1 RPC - p592)
name = "len string packet"
fields_desc = [
FieldLenField('length', 0, length_of='data', fmt="H"),
MultipleTypeField(
[(StrFixedLenField('data', '', length=2),
lambda pkt: not pkt.length)],
StrLenField('data', '', length_from=lambda pkt: pkt.length)
)
]
def extract_padding(self, p):
return b"", p
LenStringPacketLE = _make_le(LenStringPacket)
class SyntaxId(Packet):
name = "syntax Id"
fields_desc = [
UUIDField('interfaceUUID', str('0001' * 8),
uuid_fmt=UUIDField.FORMAT_BE),
ShortField('versionMajor', 0),
ShortField('versionMinor', 0),
]
def extract_padding(self, p):
return b"", p
SyntaxIdLE = _make_le(SyntaxId)
class ResultElement(Packet):
# p_result_list_t - DCE 1.1 RPC - p591
name = "p_result_t"
fields_desc = [
ShortEnumField('resultContextNegotiation', 0, _defResult),
ConditionalField(ShortEnumField('reason', 0, _defReason),
lambda pkt:pkt.resultContextNegotiation != 0),
PacketField('transferSyntax', '\x00' * 20, SyntaxId),
]
def extract_padding(self, p):
return b"", p
ResultElementLE = _make_le(ResultElement)
class ResultList(Packet):
# p_result_list_t - DCE 1.1 RPC - p592
name = "p_result_list_t"
fields_desc = [
ByteField('nbResult', 0),
ByteField('reserved', 0),
ShortField('reserved2', 0),
PacketListField('resultList', None, ResultElement,
count_from=lambda pkt:pkt.nbResult),
]
def extract_padding(self, p):
return b"", p
ResultListLE = _make_le(ResultList)
class ContextElement(Packet):
name = "context element"
fields_desc = [
ShortField('contxtId', 0),
ByteField('nbTransferSyn', 0),
ByteField('reserved', 0),
PacketField('abstractSyntax', None, SyntaxId),
PacketListField('transferSyntax', None, SyntaxId,
count_from=lambda pkt:pkt.nbTransferSyn),
]
def extract_padding(self, p):
return b"", p
ContextElementLE = _make_le(ContextElement)
# Only in Little-Endian
class STDOBJREF(Packet):
name = 'stdObjRef'
fields_desc = [
LEIntEnumField('flags', 1, {0: 'PINGING', 8: 'SORF_NOPING'}),
LEIntField('cPublicRefs', 0),
LELongField('OXID', 0),
LELongField('OID', 0),
PacketField('IPID', None, UUIDField),
]
class StringBinding(Packet):
name = 'String Binding'
fields_desc = [
LEShortField('wTowerId', 0),
# Not enough information to continue
]
class DualStringArray(Packet):
name = "Dual String Array"
fields_desc = [
ShortField('wNumEntries', 0),
ShortField('wSecurityOffset', 0),
StrFixedLenField('StringBinding', '',
# Simplify the problem
length_from=lambda pkt:pkt.wSecurityOffset),
]
DualStringArrayLE = _make_le(DualStringArray)
class OBJREF_STANDARD(Packet):
name = "objetref stanDard"
fields_desc = [
PacketField('std', None, STDOBJREF),
PacketField('saResAddr', None, DualStringArray),
]
OBJREF_STANDARDLE = _make_le(OBJREF_STANDARD)
class OBJREF_HANDLER(Packet):
name = "objetref stanDard"
fields_desc = [
PacketField('std', None, STDOBJREF),
UUIDField('clsid', str('0001' * 8), uuid_fmt=UUIDField.FORMAT_BE),
PacketField('saResAddr', None, DualStringArray),
]
OBJREF_HANDLERLE = _make_le(OBJREF_HANDLER)
class OBJREF_CUSTOM(Packet):
name = "objetref stanDard"
fields_desc = [
UUIDField('clsid', str('0001' * 8), uuid_fmt=UUIDField.FORMAT_BE),
IntField('cbExtension', 0),
IntField('reserved', 0),
]
OBJREF_CUSTOMLE = _make_le(OBJREF_CUSTOM)
class OBJREF_EXTENDED(Packet):
name = "objetref stanDard"
fields_desc = [
]
OBJREF_EXTENDEDLE = _make_le(OBJREF_EXTENDED)
# Packet for the interfaces defined
_objref_flag = {
1: 'OBJREF_STANDARD',
2: 'OBJREF_HANDLER',
4: 'OBJREF_CUSTOM',
8: 'OBJREF_EXTENDED',
}
_objref_pdu = {
1: [OBJREF_STANDARD, OBJREF_STANDARDLE],
2: [OBJREF_HANDLER, OBJREF_HANDLERLE],
4: [OBJREF_CUSTOM, OBJREF_CUSTOMLE],
8: [OBJREF_EXTENDED, OBJREF_EXTENDEDLE],
}
class IRemoteSCMActivator_RemoteCreateInstance(Packet):
name = 'RemoteCreateInstance'
fields_desc = [
ShortField('versionMajor', 0),
ShortField('versionMinor', 0),
IntEnumField('flag', 1, _objref_flag),
IntField('reserved', 0),
]
def guess_payload_class(self, payload):
try:
return _objref_pdu[self.flag][
self.__class__.__name__.endswith("LE")
]
except Exception:
pass
IRemoteSCMActivator_RemoteCreateInstanceLE = _make_le(
IRemoteSCMActivator_RemoteCreateInstance
)
IRemoteSCMActivator = {
# 0: 'Reserved for local use',
# 1: 'Reserved for local use',
# 2: 'Reserved for local use',
# 3: [IRemoteSCMActivator_RemoteGetClassObject,
# IRemoteSCMActivator_RemoteGetClassObject],
4: [IRemoteSCMActivator_RemoteCreateInstance,
IRemoteSCMActivator_RemoteCreateInstanceLE],
}
# UUID defined for DCOM
# Specifies the Distributed Component Object Model (DCOM) Remote Protocol
# https://msdn.microsoft.com/en-us/library/cc226801.aspx
# MS-Dcom.pdf 1.9
# OPC DA Specification.pdf
_standardDcomEndpoint = {
# MS-DCOM
'4d9f4ab8-7d1c-11cf-861e-0020af6e7c57': "IActivation",
'000001A0-0000-0000-C000-000000000046': IRemoteSCMActivator,
'99fcfec4-5260-101b-bbcb-00aa0021347a': "IObjectExporter",
'00000000-0000-0000-C000-000000000046': "IUnknown",
'00000131-0000-0000-C000-000000000046': "IRemUnknown_IUnknown",
'00000143-0000-0000-C000-000000000046': "IRemUnknown2_IRemUnknown",
# OLE for Process Control
'63D5F430-CFE4-11d1-B2C8-0060083BA1FB': "CATID_OPCDAServer10",
'63D5F432-CFE4-11d1-B2C8-0060083BA1FB': "CATID_OPCDAServer20",
'CC603642-66D7-48f1-B69A-B625E73652D7': "CATID_OPCDAServer30",
'39c13a4d-011e-11d0-9675-0020afd8adb3': "IOPCServer_IUnknown",
'39c13a4e-011e-11d0-9675-0020afd8adb3': "IOPCServerPublicGroups_IUnknown",
'39c13a4f-011e-11d0-9675-0020afd8adb3': "IOPCBrowseServerAddrSpace_IUnknown", # noqa: E501
'39c13a50-011e-11d0-9675-0020afd8adb3': "IOPCGroupStateMgt_IUnknown",
'39c13a51-011e-11d0-9675-0020afd8adb3': "IOPCPublicGroupStateMgt_IUnknown",
'39c13a52-011e-11d0-9675-0020afd8adb3': "IOPCSyncIO_IUnknown",
'39c13a53-011e-11d0-9675-0020afd8adb3': "IOPCAsyncIO_IUnknown",
'39c13a54-011e-11d0-9675-0020afd8adb3': "IOPCItemMgt_IUnknown",
'39c13a55-011e-11d0-9675-0020afd8adb3': "IEnumOPCItemAttributes_IUnknown",
'39c13a70-011e-11d0-9675-0020afd8adb3': "IOPCDataCallback_IUnknown",
'39c13a71-011e-11d0-9675-0020afd8adb3': "IOPCAsyncIO2_IUnknown",
'39c13a72-011e-11d0-9675-0020afd8adb3': "IOPCItemProperties_IUnknown",
'5946DA93-8B39-4ec8-AB3D-AA73DF5BC86F': "IOPCItemDeadbandMgt_IUnknown",
'3E22D313-F08B-41a5-86C8-95E95CB49FFC': "IOPCItemSamplingMgt_IUnknown",
'39227004-A18F-4b57-8B0A-5235670F4468': "IOPCBrowse_IUnknown",
'85C0B427-2893-4cbc-BD78-E5FC5146F08F': "IOPCItemIO_IUnknown",
'730F5F0F-55B1-4c81-9E18-FF8A0904E1FA': "IOPCSyncIO2_IOPCSyncIO",
'0967B97B-36EF-423e-B6F8-6BFF1E40D39D': "IOPCAsyncIO3_IOPCAsyncIO2",
'8E368666-D72E-4f78-87ED-647611C61C9F': "IOPCGroupStateMgt2_IOPCGroupStateMgt", # noqa: E501
'3B540B51-0378-4551-ADCC-EA9B104302BF': "library_OPCDA",
# Other
'000001a5-0000-0000-c000-000000000046': "ActivationContextInfo",
'00000338-0000-0000-c000-000000000046': "ActivationPropertiesIn",
}
# [MS-NLMP] 2.2.2.1
_attribute_type = {
0: 'EndOfList',
1: 'NetBIOSComputerName',
2: 'NetBIOSDomainName',
3: 'DNSComputername',
4: 'DNSDomainName',
6: 'Flags',
7: 'TimeStamp',
8: 'Restrictions',
9: 'TargetName',
10: 'ChannelBindings'
}
# Maybe depend of LE or BE
_negociate_flags = [
"negociate_0x01",
"negociate_version",
"negociate_0x04",
"negociate_0x08",
"negociate_0x10",
"negociate_128",
"negociate_key_exchange",
"negociate_56",
"target_type_domain",
"target_type_server",
"taget_type_share",
"negociate_extended_security",
"negociate_identity",
"negociate_0x002",
"request_non_nt",
"negociate_target_info",
"negociate_0x000001",
"negociate_ntlm_key",
"negociate_nt_only",
"negociate_anonymous",
"negociate_oem_doamin",
"negociate_oem_workstation",
"negociate_0x00004",
"negociate_always_sign",
"negociate_unicode",
"negociate_oem",
"request_target",
"negociate_00000008",
"negociate_sign",
"negociate_seal",
"negociate_datagram",
"negociate_lan_manager_key",
]
class AV_PAIR(Packet):
name = "AV_PAIR"
fields_desc = [
ShortEnumField('avID', 2, _attribute_type),
ShortField('avLen', 0),
StrLenField('value', '',
length_from=lambda pkt:pkt.avLen),
]
def extract_padding(self, p):
return b"", p
AV_PAIRLE = _make_le(AV_PAIR)
# NTLM
_opcDa_auth_classes = {
10: [NTLM_Header, NTLM_Header],
}
class OpcDaAuth3(Packet):
name = "Auth3"
fields_desc = [
ShortField('code', 5840),
ShortField('code2', 5840),
ByteField('authType', 10),
ByteField('authLevel', 2),
ByteField('authPadLen', 0),
ByteField('authReserved', 0),
IntField('authContextId', 0),
]
def guess_payload_class(self, payload):
try:
return _opcDa_auth_classes[self.authType][
self.__class__.__name__.endswith("LE")
]
except Exception:
pass
OpcDaAuth3LE = _make_le(OpcDaAuth3)
# A client sends a request PDU when it wants to execute a remote operation.
# In a multi-PDU request, the request consists of a series of request PDUs
# with the same sequence number and monotonically increasing fragment
# numbers. The body of a request PDU contains data that represents input
# parameters for the operation.
class RequestStubData(Packet):
name = 'RequestStubData'
fields_desc = [
ShortField('versionMajor', 0),
ShortField('versionMinor', 0),
StrField('stubdata', ''),
]
def extract_padding(self, p):
return b"", p
RequestStubDataLE = _make_le(RequestStubData)
def _opc_stubdata_length(pkt):
if not pkt.underlayer or not isinstance(pkt.underlayer, OpcDaHeaderN):
return 0
stub_data_length = pkt.underlayer.fragLength - 24
stub_data_length -= pkt.underlayer.authLength
if (OpcDaHeaderMessage in pkt.firstlayer() and
pkt.firstlayer()[OpcDaHeaderMessage].pfc_flags & 'objectUuid'):
stub_data_length -= 36
return max(0, stub_data_length)
class OpcDaRequest(Packet):
# DCE 1.1 RPC - 12.6.4.9
name = "OpcDaRequest"
fields_desc = [
IntField('allocHint', 0),
ShortField('contextId', 0),
ShortField('opNum', 0),
ConditionalField(
UUIDField('uuid', str('0001' * 8), uuid_fmt=UUIDField.FORMAT_BE),
lambda pkt: OpcDaHeaderMessage in pkt.firstlayer() and
pkt.firstlayer()[OpcDaHeaderMessage].pfc_flags & 'objectUuid'
),
PacketLenField('stubData', None, RequestStubData,
length_from=lambda pkt: _opc_stubdata_length(pkt)),
PacketField('authentication', None, AuthentificationProtocol),
]
def extract_padding(self, p):
return b"", p
OpcDaRequestLE = _make_le(OpcDaRequest)
# A client sends a ping PDU when it wants to inquire about an outstanding
# request.
# A ping PDU contains no body data.
class OpcDaPing(Packet):
# DCE 1.1 RPC - 12.5.3.7
name = "OpcDaPing"
fields_desc = []
def extract_padding(self, p):
return b"", p
# A server sends a response PDU if an operation invoked by an idempotent,
# broadcast or at-most-once request executes successfully. Servers do not send
# responses for maybe or broadcast/maybe requests. A multi-PDU response
# consists of a series of response PDUs with the same sequence number and
# monotonically increasing fragment numbers.
class OpcDaResponse(Packet):
# DCE 1.1 RPC - 12.6.4.10
name = "OpcDaResponse"
fields_desc = [
IntField('allocHint', 0),
ShortField('contextId', 0),
ByteField('cancelCount', 0),
ByteField('reserved', 0),
StrLenField('stubData', None,
length_from=lambda pkt:pkt.allocHint - 32),
PacketField('authentication', None, AuthentificationProtocol),
]
def extract_padding(self, p):
return b"", p
OpcDaResponseLE = _make_le(OpcDaResponse)
# The fault PDU is used to indicate either an RPC run-time, RPC stub, or
# RPC-specific exception to the client.
# Length of the stubdata equal allochint less header
class OpcDaFault(Packet):
# DCE 1.1 RPC - 12.6.4.7
name = "OpcDaFault"
fields_desc = [
IntField('allocHint', 0),
ShortField('contextId', 0),
ByteField('cancelCount', 0),
ByteField('reserved', 0),
IntEnumField('Group', 0, _faultStatus),
IntField('reserved2', 0),
StrLenField('stubData', None,
length_from=lambda pkt:pkt.allocHint - 32),
PacketField('authentication', None, AuthentificationProtocol),
]
def extract_padding(self, p):
return b"", p
OpcDaFaultLE = _make_le(OpcDaFault)
# A server sends a working PDU in reply to a ping PDU. This reply indicates
# that the server is processing the client's call.
# A working PDU contains no body data.
class OpcDaWorking(Packet):
name = "OpcDaWorking"
def extract_padding(self, p):
return OpcDaFack
# A nocall PDU can optionally carry a body whose format is the same as the
# optional fack PDU body.
class OpcDaNoCall(Packet):
name = "OpcDaNoCall"
def extract_padding(self, p):
return OpcDaFack
class OpcDaNoCallLE(Packet):
name = "OpcDaNoCall"
def extract_padding(self, p):
return OpcDaFackLE
# A server sends a reject PDU if an RPC request is rejected. The body of
# a reject PDU contains a status code indicating why a callee is rejecting
# a request PDU from a caller.
class OpcDaReject(Packet):
# DCE 1.1 RPC - 12.5.3.8
name = "OpcDaReject"
fields_desc = [
IntField('allocHint', 0),
ShortField('contextId', 0),
ByteField('cancelCount', 0),
ByteField('reserved', 0),
IntEnumField('Group', 0, _rejectStatus),
StrLenField('stubData', None,
length_from=lambda pkt:pkt.allocHint - 32),
PacketField('authentication', None, AuthentificationProtocol),
]
def extract_padding(self, p):
return b"", p
OpcDaRejectLE = _make_le(OpcDaReject)
# A client sends an ack PDU after it has received a response to
# an at-most-once request. An ack PDU explicitly acknowledges that the
# client has received the response; it tells the server to cease resending
# the response and discard the response PDU. (A client can also implicitly
# acknowledge receipt of a response by sending a new request.)
# An ack PDU contains no body data.
class OpcDaAck(Packet):
name = "OpcDaAck"
def extract_padding(self, p):
return b"", p
# The cancel PDU is used to forward a cancel.
class OpcDaCl_cancel(Packet):
# DCE 1.1 RPC - 12.5.3.3
name = "OpcDaCl_cancel"
fields_desc = [
PacketField('authentication', None, AuthentificationProtocol),
IntField('version', 0),
IntField('cancelId', 0),
]
def extract_padding(self, p):
return b"", p
OpcDaCl_cancelLE = _make_le(OpcDaCl_cancel)
# Both clients and servers send fack PDUs.
# A client sends a fack PDU after it has received a fragment of a multi-PDU
# response. A fack PDU explicitly acknowledges that the client has received
# the fragment; it may tell the sender to stop sending for a while.
# A server sends a fack PDU after it has received a fragment of a multi-PDU
# request. A fack PDU explicitly acknowledges that the server has received the
# fragment; it may tell the sender to stop sending for a while.
class OpcDaFack(Packet):
# DCE 1.1 RPC - 12.5.3.4
name = "OpcDaFack"
fields_desc = [
ShortField('version', 0),
ByteField('pad', 0),
ShortField('windowSize', 0),
IntField('maxTsdu', 0),
IntField('maxFragSize', 0),
ShortField('serialNum', 0),
FieldLenField('selackLen', 0, count_of='selack', fmt="H"),
PacketListField('selack', None, IntField,
count_from=lambda pkt:pkt.selackLen),
]
def extract_padding(self, p):
return b"", p
OpcDaFackLE = _make_le(OpcDaFack)
# A server sends a cancel_ack PDU after it has received a cancel PDU.
# A cancel_ack PDU acknowledges that the server has cancelled or orphaned
# a remote call or indicates that the server is not accepting cancels.
# A ancel_ack PDUs can optionally have a body. A cancel_ack PDU without a body
# acknowledges orphaning of a call, whereas a cancel_ack PDU with a body
# acknowledges cancellation of a call. Orphaned calls do not perform any
# further processing. Canceled calls transparently deliver a notification to
# the server manager routine without altering the run-time system state of the
# call. The run-time system's processing of a cancelled call continues
# uninterrupted.
class OpcDaCancel_ack(Packet):
# DCE 1.1 RPC - 12.5.3.2
name = "OpcDaCancel_ack"
fields_desc = [
IntField('version', 0),
IntField('cancelId', 0),
ByteField('accepting', 1)
]
def extract_padding(self, p):
return b"", p
OpcDaCancel_ackLE = _make_le(OpcDaCancel_ack)
# The bind PDU is used to initiate the presentation negotiation for the body
# data, and optionally, authentication. The presentation negotiation follows
# the model of the OSI presentation layer.
class OpcDaBind(Packet):
# DCE 1.1 RPC - 12.6.4.3
name = "OpcDaBind"
fields_desc = [
ShortField('maxXmitFrag', 5840),
ShortField('maxRecvtFrag', 5840),
IntField('assocGroupId', 0),
ByteField('nbContextElement', 1),
ByteField('reserved', 0),
ShortField('reserved2', 0),
PacketListField('contextItem', None, ContextElement,
count_from=lambda pkt:pkt.nbContextElement),
PacketField('authentication', None, AuthentificationProtocol),
]
def extract_padding(self, p):
return b"", p
OpcDaBindLE = _make_le(OpcDaBind)
# The bind_ack PDU is returned by the server when it accepts a bind request
# initiated by the client's bind PDU. It contains the results of presentation
# context and fragment size negotiations. It may also contain a new
# association group identifier if one was requested by the client.
class OpcDaBind_ack(Packet):
# DCE 1.1 RPC - 12.6.4.4
name = "OpcDaBind_ack"
fields_desc = [
ShortField('maxXmitFrag', 5840),
ShortField('maxRecvtFrag', 5840),
IntField('assocGroupId', 0),
PacketField('portSpec', '\x00\x00\x00\x00', LenStringPacket),
IntField('pad2', 0),
PacketField('resultList', None, ResultList),
PacketField('authentication', None, AuthentificationProtocol),
]
def extract_padding(self, p):
return b"", p
OpcDaBind_ackLE = _make_le(OpcDaBind_ack)
# The bind_nak PDU is returned by the server when it rejects an association
# request initiated by the client's bind PDU. The provider_reject_reason field
# holds the rejection reason code. When the reject reason is
# protocol_version_not_supported, the versions field contains a list of
# run-time protocol versions supported by the server.
class OpcDaBind_nak(Packet):
# DCE 1.1 RPC - 12.6.4.5
name = "OpcDaBind_nak"
fields_desc = [
ShortEnumField("providerRejectReason", 0, _rejectBindNack)
] # To complete
def extract_padding(self, p):
return b"", p
OpcDaBind_nakLE = _make_le(OpcDaBind_nak)
# The alter_context PDU is used to request additional presentation negotiation
# for another interface and/or version, or to negotiate a new security
# context, or both.
class OpcDaAlter_context(Packet):
# DCE 1.1 RPC - 12.6.4.1
name = "OpcDaAlter_context"
fields_desc = [
ShortField('maxXmitFrag', 5840),
ShortField('maxRecvtFrag', 5840),
IntField('assocGroupId', 0),