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88 lines
2.9 KiB
Lua
88 lines
2.9 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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-- 1.1.0.0 - 2007-10-12
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-- added HELP command in addition to EHLO
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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 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 = "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 result1
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local result2
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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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result1 = try(socket:receive_lines(1))
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if not string.match(result1, "^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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-- EHLO returns a multiline result - I would like to pull out the line feeds and replace them with
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-- something nicer like commas. But when I do that, it messes up the first two lines as well, which
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-- probably should be on their own lines. I have not mastered the regexes for NSE yet, so maybe some day.
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-- get rid of the line that says the commnad completed successfully
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result1 = string.gsub(result1, "\050\053\048\032\079\075\013\010", "") -- 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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result1 = string.gsub(result1, "250%-", "") -- 250-
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result1 = "Responded to EHLO command\n" .. result1
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-- ASCII for "HELP\n"
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-- for some reason it wouldn't reply unless I did it like this
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local query = "\072\069\076\080\013\010"
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try(socket:send(query))
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result2 = try(socket:receive_lines(1))
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if not string.match(result2, "^214") then
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socket.close()
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-- TODO: use print_debug instead
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return "HELP with errors or timeout. Enable --script-trace to see what is happening."
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end
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-- get rid of the 214 at the beginning of the lines in the response
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result2 = string.gsub(result2, "214%-", "") -- 214-
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result2 = string.gsub(result2, "214 ", "") -- 214
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result2 = "Responded to HELP command\n" .. result2
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result = result1 .. result2
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return result
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end
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