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local smb = require "smb"
local stdnse = require "stdnse"
local nmap = require "nmap"
description = [[
Attempts to list the supported protocols and dialects of a SMB server.
The script attempts to initiate a connection using the dialects:
* NT LM 0.12 (SMBv1)
* 2.0.2 (SMBv2)
* 2.1 (SMBv2)
* 3.0 (SMBv3)
* 3.0.2 (SMBv3)
* 3.1.1 (SMBv3)
Additionally if SMBv1 is found enabled, it will mark it as insecure. This
script is the successor to the (removed) smbv2-enabled script.
]]
---
-- @usage nmap -p445 --script smb-protocols <target>
-- @usage nmap -p139 --script smb-protocols <target>
--
-- @output
-- | smb-protocols:
-- | dialects:
-- | NT LM 0.12 (SMBv1) [dangerous, but default]
-- | 2.0.2
-- | 2.1
-- | 3.0
-- | 3.0.2
-- |_ 3.1.1
--
-- @xmloutput
-- <table key="dialects">
-- <elem>NT LM 0.12 (SMBv1) [dangerous, but default]</elem>
-- <elem>2.0.2</elem>
-- <elem>2.1</elem>
-- <elem>3.0</elem>
-- <elem>3.0.2</elem>
-- <elem>3.1.1</elem>
-- </table>
---
author = "Paulino Calderon"
license = "Same as Nmap--See https://nmap.org/book/man-legal.html"
categories = {"safe", "discovery"}
hostrule = function(host)
return smb.get_port(host) ~= nil
end
action = function(host,port)
local status, supported_dialects = smb.list_dialects(host)
if status then
for i, v in pairs(supported_dialects) do -- Mark SMBv1 as insecure
if v == "NT LM 0.12" then
supported_dialects[i] = v .. " (SMBv1) [dangerous, but default]"
end
end
if #supported_dialects > 0 then
local output = stdnse.output_table()
output.dialects = supported_dialects
return output
end
end
stdnse.debug1("No dialects were accepted")
if nmap.verbosity()>1 then
return "No dialects accepted. Something may be blocking the responses"
end
end
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