def from_buffer(buff): msg = NEGOTIATE_REPLY() msg.StructureSize = int.from_bytes(buff.read(2), byteorder='little', signed = False) assert msg.StructureSize == 65 msg.SecurityMode = NegotiateSecurityMode(int.from_bytes(buff.read(2), byteorder='little', signed = False)) msg.DialectRevision = NegotiateDialects(int.from_bytes(buff.read(2), byteorder='little', signed = False)) msg.NegotiateContextCount = int.from_bytes(buff.read(2), byteorder='little', signed = False) msg.ServerGuid = GUID.from_bytes(buff.read(16)) msg.Capabilities = NegotiateCapabilities(int.from_bytes(buff.read(4), byteorder='little', signed = False)) msg.MaxTransactSize = int.from_bytes(buff.read(4), byteorder='little', signed = False) msg.MaxReadSize = int.from_bytes(buff.read(4), byteorder='little', signed = False) msg.MaxWriteSize = int.from_bytes(buff.read(4), byteorder='little', signed = False) msg.SystemTime = timestamp2datetime(buff.read(8)) msg.ServerStartTime = timestamp2datetime(buff.read(8)) msg.SecurityBufferOffset = int.from_bytes(buff.read(2), byteorder='little', signed = False) msg.SecurityBufferLength = int.from_bytes(buff.read(2), byteorder='little', signed = False) msg.NegotiateContextOffset = int.from_bytes(buff.read(4), byteorder='little', signed = False) pos = buff.tell() if msg.SecurityBufferLength != 0: buff.seek(msg.SecurityBufferOffset, io.SEEK_SET) msg.Buffer = buff.read(msg.SecurityBufferLength) pos_buff_end = buff.tell() if msg.DialectRevision == NegotiateDialects.SMB311: msg.NegotiateContextList = [] buff.seek(msg.NegotiateContextOffset, io.SEEK_SET) for _ in range(msg.NegotiateContextCount): msg.NegotiateContextList.append(SMB2NegotiateContext.from_buffer(buff)) padsize = ((8 - buff.tell()) % 8) buff.seek(padsize, io.SEEK_CUR) return msg
def from_buffer(buff):
cmd = NEGOTIATE_REQ()
cmd.StructureSize = int.from_bytes(buff.read(2),
byteorder='little',
signed=False)
assert cmd.StructureSize == 36
cmd.DialectCount = int.from_bytes(buff.read(2),
byteorder='little',
signed=False)
assert cmd.DialectCount > 0
cmd.SecurityMode = NegotiateSecurityMode(
int.from_bytes(buff.read(2), byteorder='little', signed=False))
cmd.Reserved = buff.read(2)
cmd.Capabilities = NegotiateCapabilities(
int.from_bytes(buff.read(4), byteorder='little', signed=False))
cmd.ClientGuid = GUID.from_buffer(buff)
# skipping the next field because it's interpretation depends on the data after it...
pos = buff.tell()
buff.seek(8, io.SEEK_CUR)
cmd.Dialects = []
for i in range(0, cmd.DialectCount):
cmd.Dialects.append(
NegotiateDialects(
int.from_bytes(buff.read(2),
byteorder='little',
signed=False)))
pos_buff_end = buff.tell()
buff.seek(pos, io.SEEK_SET)
if NegotiateDialects.SMB311 in cmd.Dialects:
cmd.NegotiateContextOffset = int.from_bytes(buff.read(4),
byteorder='little',
signed=False)
cmd.NegotiateContextCount = int.from_bytes(buff.read(2),
byteorder='little',
signed=False)
cmd.Reserved2 = int.from_bytes(buff.read(2),
byteorder='little',
signed=False)
cmd.NegotiateContextList = []
buff.seek(cmd.NegotiateContextOffset, io.SEEK_SET)
for i in range(0, cmd.NegotiateContextCount):
cmd.NegotiateContextList.append(
SMB2NegotiateContext.from_buffer(buff))
pad_pos = buff.tell()
#aligning buffer, because the next data must be on 8-byte aligned position
q, m = divmod(pad_pos, 8)
if m != 0:
buff.seek((q + 1) * 8, io.SEEK_SET)
else:
cmd.ClientStartTime = int.from_bytes(buff.read(8),
byteorder='little',
signed=False)
buff.seek(pos_buff_end, io.SEEK_SET)
return cmd
def from_buffer(buff): res = VALIDATE_NEGOTIATE_INFO_REPLY() res.Capabilities = NegotiateCapabilities(int.from_bytes(buff.read(4), byteorder='little')) res.Guid = buff.read(16) res.SecurityMode = NegotiateSecurityMode(int.from_bytes(buff.read(2), byteorder='little')) res.Dialect = NegotiateDialects(int.from_bytes(buff.read(2), byteorder='little')) return res
def from_buffer(buff): res = VALIDATE_NEGOTIATE_INFO_REQ() res.Capabilities = NegotiateCapabilities(int.from_bytes(buff.read(4), byteorder='little')) res.Guid = buff.read(16) res.SecurityMode = NegotiateSecurityMode(int.from_bytes(buff.read(2), byteorder='little')) res.DialectCount = int.from_bytes(buff.read(2), byteorder='little') for _ in range(res.DialectCount): res.Dialects.append(NegotiateDialects(int.from_bytes(buff.read(2), byteorder='little'))) return res