--- a/common/util.c	Tue Apr 29 15:26:02 2014 +0200
+++ b/common/util.c	Tue Apr 29 15:26:43 2014 +0200
@@ -6,6 +6,8 @@
  * See LICENSE.txt for details.
  */
 #include "util.h"
+#include "logging.h"
+
 #ifndef _WIN32
 #include <unistd.h>
 #include <sys/types.h>
@@ -36,3 +38,82 @@
 #endif
   return ret;
 }
+
+bool is_admin()
+{
+#ifndef _WIN32
+  /* TODO implement */
+  return false;
+#else
+  bool retval = false;
+  BOOL in_admin_group = FALSE;
+  HANDLE hToken = NULL;
+  HANDLE hTokenToCheck = NULL;
+  DWORD cbSize = 0;
+  TOKEN_ELEVATION_TYPE elevation;
+  BYTE admin_id[SECURITY_MAX_SID_SIZE];
+
+  if (!OpenProcessToken(GetCurrentProcess(),
+                        TOKEN_QUERY | TOKEN_DUPLICATE, &hToken))
+    {
+      PRINTLASTERROR ("Failed to duplicate process token.\n");
+      return false;
+    }
+
+  if (!GetTokenInformation(hToken, TokenElevationType, &elevation,
+                           sizeof(elevation), &cbSize))
+    {
+      PRINTLASTERROR ("Failed to get token information.\n");
+      goto done;
+    }
+
+  /* If limited check the the linked token instead */
+  if (TokenElevationTypeLimited == elevation)
+    {
+      if (!GetTokenInformation(hToken, TokenLinkedToken, &hTokenToCheck,
+                               sizeof(hTokenToCheck), &cbSize))
+        {
+          PRINTLASTERROR ("Failed to get the linked token.\n");
+          goto done;
+        }
+    }
+
+  if (!hTokenToCheck) /* The linked token is already of the correct type */
+    {
+      if (!DuplicateToken(hToken, SecurityIdentification, &hTokenToCheck))
+        {
+          PRINTLASTERROR ("Failed to duplicate token for identification.\n");
+          goto done;
+        }
+    }
+
+  /* Do the sid dance for the adminSID */
+  cbSize = sizeof(admin_id);
+  if (!CreateWellKnownSid(WinBuiltinAdministratorsSid, NULL, &admin_id,
+                          &cbSize))
+    {
+      PRINTLASTERROR ("Failed to get admin sid.\n");
+      goto done;
+    }
+
+  /* The actual check */
+  if (!CheckTokenMembership(hTokenToCheck, &admin_id, &in_admin_group))
+    {
+      PRINTLASTERROR ("Failed to check token membership.\n");
+      goto done;
+    }
+
+  if (in_admin_group)
+    {
+      /* Winbool to standard bool */
+      retval = true;
+    }
+
+done:
+  if (hToken) CloseHandle(hToken);
+  if (hTokenToCheck) CloseHandle(hTokenToCheck);
+
+  return retval;
+#endif
+}
+