Does dbus-next work in Windows? #157

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1. Kochise commented on Nov 9, 2023

   

   Kochise

   on Nov 9, 2023

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   I suspect dbus-next is not compatible with Windows.

   https://docs.python.org/3/library/os.html#os.getuid : Availability: Unix.

   Hence NO, indeed.
2. ErikHons commented on Feb 28, 2024

   

   ErikHons

   on Feb 28, 2024

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   I have dbus-next working on Windows. I needed to override the default asyncio loop policy, create an external authenticator, and then ensure that the first address in DBUS_SESSION_BUS_ADDRESS was a tcp loopback. That's not nothing but it works fine once set up.

   The policy is set thusly:

       if platform.system() == "Windows":
           # dbus-next uses loop.add_read_reader() and loop_add_writer() to
           # watch file descriptors. Those methods aren't supported on the
           # default event-loop implementation on Windows so set the event
           # loop policy to always use the SelectorEventLoop.
           asyncio.set_event_loop_policy(asyncio.WindowsSelectorEventLoopPolicy())
   

   This works as an authenticator:

   import win32api
   import win32security
   from dbus_next.auth import Authenticator, _AuthResponse
   from dbus_next.errors import AuthError
   from ntsecuritycon import TOKEN_QUERY, TokenUser
   
   
   class AuthWindowsExternal(Authenticator):
       """An authenticator class for the Windows SID-based external auth protocol for use with the
       :class:`MessageBus <dbus_next.message_bus.BaseMessageBus>`.
   
       :sealso: https://dbus.freedesktop.org/doc/dbus-specification.html#auth-protocol
       """
   
       def __init__(self):
           pass
   
       def _authentication_start(self, negotiate_unix_fd=False) -> str:
           assert negotiate_unix_fd == False
   
           tok = win32security.OpenProcessToken(win32api.GetCurrentProcess(), TOKEN_QUERY)
           sid, _ = win32security.GetTokenInformation(tok, TokenUser)
           win32api.CloseHandle(tok)
           hex_uid = str(sid).removeprefix("PySID:").encode().hex()
           return f"AUTH EXTERNAL {hex_uid}"
   
       def _receive_line(self, line: str):
           response, args = _AuthResponse.parse(line)
   
           if response is _AuthResponse.OK:
               return "BEGIN"
   
           raise AuthError(f"authentication failed: {response.value}: {args}")
   

   Which you pass into dbus-next thusly: dbus_next.aio.message_bus.MessageBus(auth=windows.AuthWindowsExternal())
3. ErikHons commented on Feb 28, 2024

   

   ErikHons

   on Feb 28, 2024

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   I suspect dbus-next is not compatible with Windows.

   https://docs.python.org/3/library/os.html#os.getuid : Availability: Unix.

   Hence NO, indeed.

   Fortunately that method is only accessed from the AuthExternal class which you have to replace for Windows anyway.