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winutils.py
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# Copyright (c) 2016 Cloudbase Solutions Srl # # Licensed under the Apache License, Version 2.0 (the "License"); # you may not use this file except in compliance with the License. # You may obtain a copy of the License at: # # http://www.apache.org/licenses/LICENSE-2.0 # # Unless required by applicable law or agreed to in writing, software # distributed under the License is distributed on an "AS IS" BASIS, # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. # See the License for the specific language governing permissions and # limitations under the License. import sys if sys.platform != 'win32': raise Exception("Intended to use only on Windows") else: import ntsecuritycon import pywintypes import win32con import win32event import win32file import win32pipe import win32security import winerror def close_handle(handle, logger=None): try: win32file.CloseHandle(handle) return None except pywintypes.error as e: if logger is not None: logger("failed to close handle: %s" % e.strerror) return e.winerror def windows_create_pipe(sAttrs=-1, nSize=None): # Default values if parameters are not passed if sAttrs == -1: sAttrs = win32security.SECURITY_ATTRIBUTES() sAttrs.bInheritHandle = 1 if nSize is None: # If this parameter is zero, the system uses the default buffer size. nSize = 0 try: (read_pipe, write_pipe) = win32pipe.CreatePipe(sAttrs, nSize) except pywintypes.error: raise return (read_pipe, write_pipe) def windows_read_pipe(fd, length): try: (error, data) = win32file.ReadFile(fd, length) return error, data except pywintypes.error as e: return e.winerror, "" def create_file(filename, desiredAccess=None, shareMode=None, attributes=-1, CreationDisposition=None, flagsAndAttributes=None, hTemplateFile=-1): # Default values if parameters are not passed if desiredAccess is None: desiredAccess = win32file.GENERIC_READ | win32file.GENERIC_WRITE if shareMode is None: shareMode = 0 if attributes == -1: # attributes can be None attributes = None if CreationDisposition is None: CreationDisposition = win32file.OPEN_EXISTING if flagsAndAttributes is None: flagsAndAttributes = (win32file.FILE_ATTRIBUTE_NORMAL | win32file.FILE_FLAG_OVERLAPPED | win32file.FILE_FLAG_NO_BUFFERING) if hTemplateFile == -1: hTemplateFile = None try: npipe = win32file.CreateFile(filename, desiredAccess, shareMode, attributes, CreationDisposition, flagsAndAttributes, hTemplateFile) except pywintypes.error: raise return npipe def write_file(handle, data, overlapped=None): try: (errCode, nBytesWritten) = win32file.WriteFile(handle, data, overlapped) # Note: win32file.WriteFile doesn't throw an exception # in case it receives ERROR_IO_PENDING. return (errCode, nBytesWritten) except pywintypes.error as e: return (e.winerror, 0) def read_file(handle, bufsize, overlapped=None): try: # Note: win32file.ReadFile doesn't throw an exception # in case it receives ERROR_IO_PENDING. (errCode, read_buffer) = win32file.ReadFile( handle, bufsize, overlapped) return (errCode, read_buffer) except pywintypes.error as e: return (e.winerror, "") def create_named_pipe(pipename, openMode=None, pipeMode=None, nMaxInstances=None, nOutBufferSize=None, nInBufferSize=None, nDefaultTimeOut=None, saAttr=-1): # Default values if parameters are not passed if openMode is None: openMode = win32con.PIPE_ACCESS_DUPLEX | win32con.FILE_FLAG_OVERLAPPED if pipeMode is None: pipeMode = (win32con.PIPE_TYPE_MESSAGE | win32con.PIPE_READMODE_BYTE | win32con.PIPE_WAIT) if nMaxInstances is None: nMaxInstances = 64 if nOutBufferSize is None: nOutBufferSize = 65000 if nInBufferSize is None: nInBufferSize = 65000 if nDefaultTimeOut is None: nDefaultTimeOut = 0 if saAttr == -1: # saAttr can be None saAttr = win32security.SECURITY_ATTRIBUTES() # The identifier authority. sia = ntsecuritycon.SECURITY_NT_AUTHORITY # Initialize the SID. remoteAccessSid = win32security.SID() remoteAccessSid.Initialize( sia, # The identifier authority. 1) # The number of sub authorities to allocate. # Disable access over network. remoteAccessSid.SetSubAuthority( 0, # The index of the sub authority to set ntsecuritycon.SECURITY_NETWORK_RID) allowedPsids = [] # Allow Windows Services to access the Named Pipe. allowedPsid_0 = win32security.SID() allowedPsid_0.Initialize( sia, # The identifier authority. 1) # The number of sub authorities to allocate. allowedPsid_0.SetSubAuthority( 0, # The index of the sub authority to set ntsecuritycon.SECURITY_LOCAL_SYSTEM_RID) # Allow Administrators to access the Named Pipe. allowedPsid_1 = win32security.SID() allowedPsid_1.Initialize( sia, # The identifier authority. 2) # The number of sub authorities to allocate. allowedPsid_1.SetSubAuthority( 0, # The index of the sub authority to set ntsecuritycon.SECURITY_BUILTIN_DOMAIN_RID) allowedPsid_1.SetSubAuthority( 1, # The index of the sub authority to set ntsecuritycon.DOMAIN_ALIAS_RID_ADMINS) allowedPsids.append(allowedPsid_0) allowedPsids.append(allowedPsid_1) # Initialize an ACL. acl = win32security.ACL() acl.Initialize() # Add denied ACL. acl.AddAccessDeniedAce(win32security.ACL_REVISION, ntsecuritycon.GENERIC_ALL, remoteAccessSid) # Add allowed ACLs. for allowedPsid in allowedPsids: acl.AddAccessAllowedAce(win32security.ACL_REVISION, ntsecuritycon.GENERIC_ALL, allowedPsid) # Initialize an SD. sd = win32security.SECURITY_DESCRIPTOR() sd.Initialize() # Set DACL. sd.SetSecurityDescriptorDacl(True, acl, False) saAttr.bInheritHandle = 1 saAttr.SECURITY_DESCRIPTOR = sd try: npipe = win32pipe.CreateNamedPipe(pipename, openMode, pipeMode, nMaxInstances, nOutBufferSize, nInBufferSize, nDefaultTimeOut, saAttr) if npipe == win32file.INVALID_HANDLE_VALUE: return None return npipe except pywintypes.error: return None def set_pipe_mode(hPipe, mode=-1, maxCollectionCount=None, collectDataTimeout=None): # Default values if parameters are not passed if mode == -1: mode = win32pipe.PIPE_READMODE_BYTE try: win32pipe.SetNamedPipeHandleState( hPipe, mode, maxCollectionCount, collectDataTimeout) except pywintypes.error: raise def connect_named_pipe(pipe_handle, overlapped=None): try: # If the result of ConnectNamedPipe is ERROR_IO_PENDING or # ERROR_PIPE_CONNECTED, then this value is returned. # All other error values raise a win32 exception error = win32pipe.ConnectNamedPipe(pipe_handle, overlapped) return error except pywintypes.error as e: return e.winerror def get_pipe_name(name): name = name.replace('/', '') name = name.replace('\\', '') name = "\\\\.\\pipe\\" + name return name def get_overlapped_result(handle, overlapped=None, bWait=False): try: return win32file.GetOverlappedResult(handle, overlapped, bWait) except pywintypes.error: raise def get_new_event(sa=None, bManualReset=True, bInitialState=True, objectName=None): return win32event.CreateEvent(sa, bManualReset, bInitialState, objectName) pipe_disconnected_errors = [winerror.ERROR_PIPE_NOT_CONNECTED, winerror.ERROR_BAD_PIPE, winerror.ERROR_NO_DATA, winerror.ERROR_BROKEN_PIPE]