From 5d8375007754101ff2889d0e79486c8f9b7cf5ab Mon Sep 17 00:00:00 2001
From: Rob Mensching <rob@firegiant.com>
Date: Sun, 3 Sep 2017 11:22:38 -0700
Subject: Initial commit

---
 src/dutil/proc3utl.cpp | 114 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 114 insertions(+)
 create mode 100644 src/dutil/proc3utl.cpp

(limited to 'src/dutil/proc3utl.cpp')

diff --git a/src/dutil/proc3utl.cpp b/src/dutil/proc3utl.cpp
new file mode 100644
index 00000000..038f002b
--- /dev/null
+++ b/src/dutil/proc3utl.cpp
@@ -0,0 +1,114 @@
+// Copyright (c) .NET Foundation and contributors. All rights reserved. Licensed under the Microsoft Reciprocal License. See LICENSE.TXT file in the project root for full license information.
+
+#include "precomp.h"
+
+static HRESULT GetActiveSessionUserToken(
+    __out HANDLE *phToken
+    );
+
+
+/********************************************************************
+ ProcExecuteAsInteractiveUser() - runs process as currently logged in
+                                  user.
+*******************************************************************/
+extern "C" HRESULT DAPI ProcExecuteAsInteractiveUser(
+    __in_z LPCWSTR wzExecutablePath,
+    __in_z LPCWSTR wzCommandLine,
+    __out HANDLE *phProcess
+    )
+{
+    HRESULT hr = S_OK;
+    HANDLE hToken = NULL;
+    LPVOID pEnvironment = NULL;
+    LPWSTR sczFullCommandLine = NULL;
+    STARTUPINFOW si = { };
+    PROCESS_INFORMATION pi = { };
+
+    hr = GetActiveSessionUserToken(&hToken);
+    ExitOnFailure(hr, "Failed to get active session user token.");
+
+    if (!::CreateEnvironmentBlock(&pEnvironment, hToken, FALSE))
+    {
+        ExitWithLastError(hr, "Failed to create environment block for UI process.");
+    }
+
+    hr = StrAllocFormatted(&sczFullCommandLine, L"\"%ls\" %ls", wzExecutablePath, wzCommandLine);
+    ExitOnFailure(hr, "Failed to allocate full command-line.");
+
+    si.cb = sizeof(si);
+    if (!::CreateProcessAsUserW(hToken, wzExecutablePath, sczFullCommandLine, NULL, NULL, FALSE, CREATE_UNICODE_ENVIRONMENT, pEnvironment, NULL, &si, &pi))
+    {
+        ExitWithLastError(hr, "Failed to create UI process: %ls", sczFullCommandLine);
+    }
+
+    *phProcess = pi.hProcess;
+    pi.hProcess = NULL;
+
+LExit:
+    ReleaseHandle(pi.hThread);
+    ReleaseHandle(pi.hProcess);
+    ReleaseStr(sczFullCommandLine);
+
+    if (pEnvironment)
+    {
+        ::DestroyEnvironmentBlock(pEnvironment);
+    }
+
+    ReleaseHandle(hToken);
+
+    return hr;
+}
+
+
+static HRESULT GetActiveSessionUserToken(
+    __out HANDLE *phToken
+    )
+{
+    HRESULT hr = S_OK;
+    PWTS_SESSION_INFO pSessionInfo = NULL;
+    DWORD cSessions = 0;
+    DWORD dwSessionId = 0;
+    BOOL fSessionFound = FALSE;
+    HANDLE hToken = NULL;
+
+    // Loop through the sessions looking for the active one.
+    if (!::WTSEnumerateSessions(WTS_CURRENT_SERVER_HANDLE, 0, 1, &pSessionInfo, &cSessions))
+    {
+        ExitWithLastError(hr, "Failed to enumerate sessions.");
+    }
+
+    for (DWORD i = 0; i < cSessions; ++i)
+    {
+        if (WTSActive == pSessionInfo[i].State)
+        {
+            dwSessionId = pSessionInfo[i].SessionId;
+            fSessionFound = TRUE;
+
+            break;
+        }
+    }
+
+    if (!fSessionFound)
+    {
+        ExitFunction1(hr = E_NOTFOUND);
+    }
+
+    // Get the user token from the active session.
+    if (!::WTSQueryUserToken(dwSessionId, &hToken))
+    {
+        ExitWithLastError(hr, "Failed to get active session user token.");
+    }
+
+    *phToken = hToken;
+    hToken = NULL;
+
+LExit:
+    ReleaseHandle(hToken);
+
+    if (pSessionInfo)
+    {
+        ::WTSFreeMemory(pSessionInfo);
+    }
+
+    return hr;
+}
-- 
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