def __init__(self, fld):
# Quote from https://www.radiotap.org/:
# ""Radiotap requires that all fields in the radiotap header are aligned to natural boundaries. # noqa: E501
# For radiotap, that means all 8-, 16-, 32-, and 64-bit fields must begin on 8-, 16-, 32-, and 64-bit boundaries, respectively."" # noqa: E501
if isinstance(fld, BitField):
_align = int(math.ceil(fld.i2len(None, None)))
else:
_align = struct.calcsize(fld.fmt)
ReversePadField.__init__(self, fld, _align, padwith=b"\x00")
class LocatorPacket(Packet):
name = "RTPS Locator"
fields_desc = [
XIntField("locatorKind", 0),
LEIntField("port", 0),
ReversePadField(IPField("address", "0.0.0.0"), 20),
]
def extract_padding(self, p):
return b"", p
class SMB2_Negotiate_Protocol_Response(Packet):
name = "SMB2 Negotiate Protocol Response"
fields_desc = [
XLEShortField("StructureSize", 0),
FlagsField("SecurityMode", 0, -16, {
0x1: "Signing Required",
0x2: "Signing Enabled",
}),
LEShortEnumField("DialectRevision", 0x0, SMB_DIALECTS),
FieldLenField("NegotiateCount",
None,
fmt="<H",
count_of="NegotiateContexts"),
UUIDField("ServerGUID", 0x0, uuid_fmt=UUIDField.FORMAT_LE),
# Capabilities
FlagsField("Capabilities", 0, -32, SMB2_CAPABILITIES),
LEIntField("MaxTransactionSize", 0),
LEIntField("MaxReadSize", 0),
LEIntField("MaxWriteSize", 0),
UTCTimeField("SystemTime",
None,
fmt="<Q",
epoch=[1601, 1, 1, 0, 0, 0],
custom_scaling=1e7),
UTCTimeField("ServerStartTime",
None,
fmt="<Q",
epoch=[1601, 1, 1, 0, 0, 0],
custom_scaling=1e7),
XLEShortField("SecurityBlobOffset", 0),
FieldLenField("SecurityBlobLength",
None,
fmt="<H",
length_of="SecurityBlob"),
XLEIntField("NegotiateContextOffset", 0),
PacketLenField("SecurityBlob",
None,
GSSAPI_BLOB,
length_from=lambda x: x.SecurityBlobLength),
# Field only exists if Dialect is 0x0311
# Each negotiate context must be 8-byte aligned
ConditionalField(
FieldListField("NegotiateContexts", [],
ReversePadField(
PacketField("Context", None,
SMB2_Negotiate_Context), 8),
count_from=lambda pkt: pkt.NegotiateCount),
lambda x: x.DialectRevision == 0x0311),
]
class LocatorPacket(EPacket):
name = "RTPS Locator"
fields_desc = [
EField(XIntField("locatorKind", 0),
endianness=FORMAT_LE,
endianness_from=None),
EField(IntField("port", 0), endianness=FORMAT_LE,
endianness_from=None),
ConditionalField(ReversePadField(IPField("address", "0.0.0.0"), 20),
lambda p: p.locatorKind == 0x1),
ConditionalField(XStrFixedLenField("hostId", 0x0, 16),
lambda p: p.locatorKind == 0x01000000)
]
def extract_padding(self, p):
return b"", p
class SMBSession_Setup_AndX_Response_Extended_Security(Packet):
name = "Session Setup AndX Extended Security Response (SMB)"
WordCount = 7
fields_desc = SMBSession_Setup_AndX_Response.fields_desc[:5] + [
LEFieldLenField("SecurityBlobLength", None, length_of="SecurityBlob"),
LEShortField("ByteCount", 25),
PacketLenField("SecurityBlob",
None,
GSSAPI_BLOB,
length_from=lambda x: x.SecurityBlobLength),
ReversePadField(
_SMBStrNullField("NativeOS", "Windows 4.0"),
2,
b"\0",
),
_SMBStrNullField("NativeLanMan", "Windows 4.0")
]
class SMBSession_Setup_AndX_Request(Packet):
name = "Session Setup AndX Request (CIFS)"
fields_desc = [
ByteField("WordCount", 13),
ByteEnumField("AndXCommand", 0x75, SMB_COM),
ByteField("AndXReserved", 0),
LEShortField("AndXOffset", 96),
LEShortField("MaxBufferSize", 2920),
LEShortField("MaxMPXCount", 50),
LEShortField("VCNumber", 0),
LEIntField("SessionKey", 0),
LEFieldLenField("OEMPasswordLength", None, length_of="OEMPassword"),
LEFieldLenField("UnicodePasswordLength",
None,
length_of="UnicodePassword"),
LEIntField("Reserved", 0),
FlagsField("ServerCapabilities", 0x05, -32, _SMB_ServerCapabilities),
LEShortField("ByteCount", 35),
XStrLenField("OEMPassword",
"Pass",
length_from=lambda x: x.OEMPasswordLength),
XStrLenField("UnicodePassword",
"Pass",
length_from=lambda x: x.UnicodePasswordLength),
ReversePadField(StrNullField("AccountName", "GUEST"), 2, b"\0"),
_SMBStrNullField("PrimaryDomain", ""),
_SMBStrNullField("NativeOS", "Windows 4.0"),
_SMBStrNullField("NativeLanMan", "Windows 4.0"),
# Off spec?
ByteField("WordCount2", 4),
ByteEnumField("AndXCommand2", 0xFF, {0xFF: "SMB_COM_NONE"}),
ByteField("Reserved6", 0),
LEShortField("AndXOffset2", 0),
LEShortField("Flags3", 0x2),
LEShortField("PasswordLength", 0x1),
LEShortField("ByteCount2", 18),
ByteField("Password", 0),
StrNullField("Path", "\\\\WIN2K\\IPC$"),
StrNullField("Service", "IPC")
]
class SMB2_Negociate_Protocol_Request_Header(Packet):
name = "SMB2 Negociate Protocol Request Header"
fields_desc = [
XLEShortField("StructureSize", 0),
FieldLenField(
"DialectCount", None,
fmt="<H",
count_of="Dialects"
),
# SecurityMode
FlagsField("SecurityMode", 0, 16, {
0x7: "Signing Required",
0x8: "Signing Enabled",
}),
LEShortField("Reserved", 0),
# Capabilities
FlagsField("Capabilities", 0, 32, SMB2_CAPABILITIES),
UUIDField("ClientGUID", 0x0, uuid_fmt=UUIDField.FORMAT_LE),
XLEIntField("NegociateContextOffset", 0x0),
FieldLenField(
"NegociateCount", 0x0,
fmt="<H",
count_of="NegociateContexts"
),
ShortField("Reserved2", 0),
FieldListField(
"Dialects", [0x0202],
LEShortEnumField("", 0x0, SMB_DIALECTS),
count_from=lambda pkt: pkt.DialectCount
),
# The first negotiate context must be 8-byte aligned
ReversePadField(PacketListField(
"NegociateContexts", [],
SMB2_Negociate_Context,
count_from=lambda pkt: pkt.NegociateCount
), 8),
]
class SMB2_Negotiate_Protocol_Request(Packet):
name = "SMB2 Negotiate Protocol Request"
fields_desc = [
XLEShortField("StructureSize", 0),
FieldLenField("DialectCount", None, fmt="<H", count_of="Dialects"),
# SecurityMode
FlagsField(
"SecurityMode", 0, -16, {
0x01: "SMB2_NEGOTIATE_SIGNING_ENABLED",
0x02: "SMB2_NEGOTIATE_SIGNING_REQUIRED",
}),
LEShortField("Reserved", 0),
# Capabilities
FlagsField("Capabilities", 0, -32, SMB2_CAPABILITIES),
UUIDField("ClientGUID", 0x0, uuid_fmt=UUIDField.FORMAT_LE),
# XXX TODO If we ever want to properly dissect the offsets, we have
# a _NTLMPayloadField in scapy/layers/ntlm.py that does precisely that
XLEIntField("NegotiateContextOffset", 0x0),
FieldLenField("NegotiateCount",
None,
fmt="<H",
count_of="NegotiateContexts"),
ShortField("Reserved2", 0),
FieldListField("Dialects", [0x0202],
LEShortEnumField("", 0x0, SMB_DIALECTS),
count_from=lambda pkt: pkt.DialectCount),
# Field only exists if Dialects contains 0x0311
# Each negotiate context must be 8-byte aligned
ConditionalField(
FieldListField("NegotiateContexts", [],
ReversePadField(
PacketField("Context", None,
SMB2_Negotiate_Context), 8),
count_from=lambda pkt: pkt.NegotiateCount),
lambda x: 0x0311 in x.Dialects),
]