def __init__(self):
# Create a pipe so we can write to stdin of the loader process.
pipeReadOrig, self._pipeWrite = winKernel.CreatePipe(None, 0)
# Make the read end of the pipe inheritable.
pipeRead = self._duplicateAsInheritable(pipeReadOrig)
winKernel.closeHandle(pipeReadOrig)
# stdout/stderr of the loader process should go to nul.
with file("nul", "w") as nul:
nulHandle = self._duplicateAsInheritable(
msvcrt.get_osfhandle(nul.fileno()))
# Set the process to start with the appropriate std* handles.
si = winKernel.STARTUPINFO(dwFlags=winKernel.STARTF_USESTDHANDLES,
hSTDInput=pipeRead,
hSTDOutput=nulHandle,
hSTDError=nulHandle)
pi = winKernel.PROCESS_INFORMATION()
# Even if we have uiAccess privileges, they will not be inherited by default.
# Therefore, explicitly specify our own process token, which causes them to be inherited.
token = winKernel.OpenProcessToken(winKernel.GetCurrentProcess(),
winKernel.MAXIMUM_ALLOWED)
try:
winKernel.CreateProcessAsUser(token, None,
u"lib64/nvdaHelperRemoteLoader.exe",
None, None, True, None, None, None,
si, pi)
# We don't need the thread handle.
winKernel.closeHandle(pi.hThread)
self._process = pi.hProcess
except:
winKernel.closeHandle(self._pipeWrite)
raise
finally:
winKernel.closeHandle(pipeRead)
winKernel.closeHandle(token)
def _duplicateAsInheritable(self, handle):
curProc = winKernel.GetCurrentProcess()
return winKernel.DuplicateHandle(curProc, handle, curProc, 0, True,
winKernel.DUPLICATE_SAME_ACCESS)
def getCurrentProcessLogonSessionId() -> int:
return getProcessLogonSessionId(winKernel.GetCurrentProcess())
