--- a/common/util.c	Thu Jun 26 17:42:52 2014 +0200
+++ b/common/util.c	Fri Jun 27 10:27:08 2014 +0200
@@ -19,6 +19,55 @@
 #include <windows.h>
 #endif
 
+static PSID
+copy_sid(PSID from)
+{
+  if (!from)
+    {
+      return 0;
+    }
+
+  DWORD sidLength = GetLengthSid(from);
+  PSID to = (PSID) xmalloc(sidLength);
+  CopySid(sidLength, to, from);
+  return to;
+}
+
+
+PSID
+get_process_owner(HANDLE hProcess)
+{
+    HANDLE hToken = NULL;
+    PSID sid;
+
+    if (hProcess == NULL)
+      {
+        ERRORPRINTF ("invalid call to get_process_owner");
+        return NULL;
+      }
+
+    OpenProcessToken(hProcess, TOKEN_READ, &hToken);
+    if (hToken)
+      {
+        DWORD size = 0;
+        PTOKEN_USER userStruct;
+
+        // check how much space is needed
+        GetTokenInformation(hToken, TokenUser, NULL, 0, &size);
+        if (ERROR_INSUFFICIENT_BUFFER == GetLastError())
+          {
+            userStruct = (PTOKEN_USER) xmalloc (size);
+            GetTokenInformation(hToken, TokenUser, userStruct, size, &size);
+
+            sid = copy_sid(userStruct->User.Sid);
+            CloseHandle(hToken);
+            xfree (userStruct);
+            return sid;
+          }
+      }
+    return NULL;
+}
+
 bool
 is_elevated()
 {