From 4e45f85fbbfd2dda8da663beae603308751a0b03 Mon Sep 17 00:00:00 2001
From: Karim Kanso <kaz.kanso@gmail.com>
Date: Wed, 8 Apr 2020 21:32:48 +0100
Subject: [PATCH] improved compatibility when null sessions fail

---
 hydra-smb2.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/hydra-smb2.c b/hydra-smb2.c
index c603d63..a09490d 100644
--- a/hydra-smb2.c
+++ b/hydra-smb2.c
@@ -131,6 +131,14 @@ bool smb2_run_test(creds_t *cr, const char *server, uint16_t port) {
     smbc_free_context(ctx, 1);
     return true;
     break;
+  case EPERM:
+    // Probably this means access denied inspite of mention above
+    // about being related to wrong workgroup. I have observed
+    // libsmbclient emitting this when connecting to a vanilla install
+    // of Windows 2019 server (non-domain) with wrong credentials. It
+    // appears related to a fallback null session being rejected after
+    // the library tries with provided credentials. If the null
+    // session is accepted, EACCES is returned.
   case EACCES:
     // 100% access denied
     break;