From 49ba383eee907bc383fbdc11eefb3564c733b699 Mon Sep 17 00:00:00 2001
From: dmiller <dmiller@e0a8ed71-7df4-0310-8962-fdc924857419>
Date: Sun, 30 Apr 2017 13:18:06 +0000
Subject: [PATCH] Avoid crash if AuthMethod key is not set in iscsi handshake.
 Fixes #631

---
 nselib/iscsi.lua | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/nselib/iscsi.lua b/nselib/iscsi.lua
index f84848ab0..6d3ddf7b9 100644
--- a/nselib/iscsi.lua
+++ b/nselib/iscsi.lua
@@ -589,7 +589,9 @@ Helper = {
     end
 
     local auth_method = resp.kvp:get("AuthMethod")[1]
-    if ( auth_method:upper() ~= "NONE" ) then
+    if not auth_method then
+      stdnse.debug1("Missing AuthMethod, proceeding as if NONE was sent.")
+    elseif ( auth_method:upper() ~= "NONE" ) then
       return false, "ERROR: iscsi.Helper.discoverTargets: Unsupported authentication method"
     end