Re: alternative to SeCaptureSubjectContext for Win2000 sought From: "dave porter" Reply to: "dave porter" Date: Mon, 26 Jun 2000 10:57:18 -0400 Newsgroups: comp.os.ms-windows.programmer.nt.kernel-mode Followup to: newsgroup References: <39520e7f$0$15896@wodc7nh1.news.uu.net> <39575985$0$24336@wodc7nh0.news.uu.net> > Under advise, I have tried ZwOpenProcessToken(), but to little avail. > ZwQueryInformationToken( ..TokenUser ...) doesn't seem to want to do its job > either under NT4. I could be jumping in the middle here, but in what way doesn't it work? This code works for me: int bufLen = 256; // we suppose this is enough void* sidBuf = new char[bufLen]; int sidLen = 0; void* pToken = PsReferencePrimaryToken(PsGetCurrentProcess()); if (!pToken) ... error ... NTSTATUS ntstatus = ObOpenObjectByPointer(pToken, 0, 0, TOKEN_QUERY, 0, KernelMode, &handle); if (!NT_SUCCESS(ntstatus)) ... error ... TOKEN_USER* user = static_cast(sidBuf); ULONG tokenInfoLen; ntstatus = ZwQueryInformationToken(handle, TokenUser, user, bufLen, &tokenInfoLen); if (!NT_SUCCESS(ntstatus)) ... error ... assert(tokenInfoLen <= bufLen); // else we would have got an error, right? assert(user->User.Sid == user+1); // SID is in buffer just past TOKEN_USER structure sidLen = tokenInfoLen - sizeof (TOKEN_USER); memmove(sidBuf, user->User.Sid, sidLen); // shuffle down the buffer Naturally, this returns the id of the thread that's running it. If you execute this in DriverEntry, you're running in some thread in the system process, which is not related to the thread which executed the Win32 StartService call.