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59 lines
1.6 KiB
Lua
59 lines
1.6 KiB
Lua
-- SMTP supported commands gathering script
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-- Version History
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-- 1.0.0.0 - 2007-06-12
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-- Cribbed heavily from Thomas Buchanan's SQL version detection
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-- script and from Arturo 'Buanzo' Busleiman's SMTP open relay
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-- detector script.
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id = "SMTP"
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description = "Attempts to use EHLO to gather the Extended commands an SMTP server supports."
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author = "Jason DePriest <jrdepriest@gmail.com>"
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license = "See nmaps COPYING for licence"
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categories = {"discovery", "intrusive"}
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require "shortport"
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portrule = shortport.port_or_service({25, 587, 465}, "smtp")
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action = function(host, port)
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local socket = nmap.new_socket()
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socket:set_timeout(5000)
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local result
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local commands
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local mailservername
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local status = true
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local catch = function()
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socket:close()
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end
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local try = nmap.new_try(catch)
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try(socket:connect(host.ip, port.number, port.protocol))
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result = try(socket:receive_lines(1))
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-- ASCII for "EHLO example.org\n"
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-- for some reason it wouldn't reply unless I did it like this
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local query = "\069\072\076\079\032\101\120\097"
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query = query .. "\109\112\108\101\046\111\114\103"
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query = query .. "\013\010"
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try(socket:send(query))
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result = try(socket:receive_lines(1))
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if not string.match(result, "^250") then
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socket.close()
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-- TODO: use print_debug instead
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return "EHLO with errors or timeout. Enable --script-trace to see what is happening."
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end
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result = string.gsub(result, "\050\053\048\032\079\075\013\010", "") -- 250 OK (needed to have the \r\n in there)
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result = string.gsub(result, "250%-", "") -- 250-
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result = "Responded to EHLO command\n" .. result
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return result
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end
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