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123 lines
4.2 KiB
Lua
123 lines
4.2 KiB
Lua
--- SMTP supported commands gathering script \n
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-- \n
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-- Attempts to use EHLO and HELP to gather the Extended commands an
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-- SMTP server supports.
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-- \n
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-- @output
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-- 25/tcp open smtp \n
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-- | SMTPcommands: EHLO uninvited.example.net Hello root at localhost [127.0.0.1], SIZE 52428800, PIPELINING, 250 HELP \n
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-- |_ HELP Commands supported:, , AUTH HELO EHLO MAIL RCPT DATA NOOP QUIT RSET HELP \n
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-- Version History
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-- 1.1.0.0 - 2007-10-12
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-- + added HELP command in addition to EHLO
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-- 1.2.0.0 - 2008-05-19
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-- + made output single line, comma-delimited, instead of
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-- CR LF delimited on multi-lines
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-- + was able to use regular text and not hex codes
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-- 1.3.0.0 - 2008-05-21
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-- + more robust handling of problems
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-- + uses verbosity and debugging to decide if you need to
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-- see certain errors and if the output is in a line or
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-- in , for lack of a better word, fancy format
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-- + I am not able to do much testing because my new ISP blocks
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-- traffic going to port 25 other than to their mail servers as
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-- a "security" measure.
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-- 1.3.1.0 - 2008-05-22
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-- + minor tweaks to get it working when one of the requests fails
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-- but not both of them.
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-- 1.5.0.0 - 2008-08-15
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-- + updated to use the nsedoc documentation system
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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 = "SMTPcommands"
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description = "Attempts to use EHLO and HELP to gather the Extended commands an SMTP server supports."
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author = "Jason DePriest <jrdepriest@gmail.com>"
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license = "Same as Nmap--See http://nmap.org/book/man-legal.html"
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categories = {"default", "discovery", "safe"}
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require "shortport"
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require "stdnse"
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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 resultEHLO
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local resultHELP
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local catch = function()
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socket:close()
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--return
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end
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local try = nmap.new_try(catch)
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local attempt = try(socket:connect(host.ip, port.number, port.protocol))
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if attempt then
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if nmap.verbosity() >= 2 or nmap.debugging() >= 1 then -- only tell you it fails if you are debugging or verbose X 2
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return "Problem connecting to " .. host.ip .. " on port " .. port.number .. " using protocol " .. port.protocol
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else
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return -- if you aren't debugging, just return with nothing
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end
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end
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result = try(socket:receive_lines(1))
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local query = "EHLO example.org\r\n"
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try(socket:send(query))
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resultEHLO = try(socket:receive_lines(1))
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if not (string.match(resultEHLO, "^250")) then
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-- stdnse.print_debug("1",resultEHLO)
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-- stdnse.print_debug("1","EHLO with errors or timeout. Enable --script-trace to see what is happening.")
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resultEHLO = ""
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end
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if resultEHLO ~= "" then
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resultEHLO = string.gsub(resultEHLO, "250 OK[\r\n]", "") -- 250 OK (needed to have the \r\n in there)
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-- get rid of the 250- at the beginning of each line in the response
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resultEHLO = string.gsub(resultEHLO, "250%-", "") -- 250-
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resultEHLO = string.gsub(resultEHLO,"[\r\n]+$", "") -- no final CR LF
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resultEHLO = string.gsub(resultEHLO, "\r\n", ", ") -- CR LF to comma
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resultEHLO = "\nEHLO " .. resultEHLO
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end
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local query = "HELP\r\n"
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try(socket:send(query))
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resultHELP = try(socket:receive_lines(1))
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if not (string.match(resultHELP, "^214")) then
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-- stdnse.print_debug("1",resultHELP)
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-- stdnse.print_debug("1","HELP with errors or timeout. Enable --script-trace to see what is happening.")
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resultHELP = ""
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end
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if resultHELP ~= "" then
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resultHELP = string.gsub(resultHELP, "214%-", "") -- 214-
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-- get rid of the 214 at the beginning of the lines in the response
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resultHELP = string.gsub(resultHELP, "214 ", "") -- 214
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resultHELP = string.gsub(resultHELP,"[\r\n]+$", "") -- no final CR LF
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resultHELP = string.gsub(resultHELP, "[\r\n]", ", ") -- CR LF to comma
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resultHELP = "\nHELP " .. resultHELP
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end
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result = resultEHLO .. resultHELP
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socket:close()
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return result
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end
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