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a285f82299
available rather than lines if neither the "bytes" nor "lines" options are given. Thanks to Brandon for reporting a problem which he noticed in the dns-test-open-recursion script. [Kris]
97 lines
3.6 KiB
Lua
97 lines
3.6 KiB
Lua
-- PPTP information gathering script
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-- rev 0.2 (11-14-2007)
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id = "PPTP"
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description = "Attempts to extract system information from PPTP service"
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author = "Thomas Buchanan <tbuchanan@thecompassgrp.net>"
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license = "Same as Nmap--See http://nmap.org/book/man-legal.html"
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categories = {"version"}
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require "comm"
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portrule = function(host, port)
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if
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port.number == 1723
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and port.protocol == "tcp"
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and port.state == "open"
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then
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return true
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else
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return false
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end
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end
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action = function(host, port)
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local payload
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-- build a PPTP Start-Control-Connection-Request packet
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-- copied from packet capture of pptp exchange
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-- for details of packet structure, see http://www.ietf.org/rfc/rfc2637.txt
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payload = "\000\156\000\001\026\043\060\077" -- length=156, Message type=control, cookie
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payload = payload .. "\000\001\000\000\001\000\000\000" -- Control type=Start-Control-Connection-Request, Reserved, Protocol=1.0, Reserverd
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payload = payload .. "\000\000\000\001\000\000\000\001" -- Framing Capabilities, Bearer Capabilities
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payload = payload .. "\255\255\000\001" .. "none" -- Maximum channels, firmware version, hostname
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payload = payload .. "\000\000\000\000\000\000\000\000" -- padding for hostname
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payload = payload .. "\000\000\000\000\000\000\000\000" -- padding for hostname
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payload = payload .. "\000\000\000\000\000\000\000\000" -- padding for hostname
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payload = payload .. "\000\000\000\000\000\000\000\000" -- padding for hostname
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payload = payload .. "\000\000\000\000\000\000\000\000" -- padding for hostname
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payload = payload .. "\000\000\000\000\000\000\000\000" -- padding for hostname
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payload = payload .. "\000\000\000\000\000\000\000\000" -- padding for hostname
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payload = payload .. "\000\000\000\000" .. "nmap" -- padding for hostname, vendor name
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payload = payload .. "\000\000\000\000\000\000\000\000" -- padding for vendor name
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payload = payload .. "\000\000\000\000\000\000\000\000" -- padding for vendor name
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payload = payload .. "\000\000\000\000\000\000\000\000" -- padding for vendor name
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payload = payload .. "\000\000\000\000\000\000\000\000" -- padding for vendor name
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payload = payload .. "\000\000\000\000\000\000\000\000" -- padding for vendor name
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payload = payload .. "\000\000\000\000\000\000\000\000" -- padding for vendor name
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payload = payload .. "\000\000\000\000\000\000\000\000" -- padding for vendor name
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payload = payload .. "\000\000\000\000" -- padding for vendor name
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local try = nmap.new_try()
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local response = try(comm.exchange(host, port, payload, {timeout=5000}))
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local result
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-- check to see if the packet we got back matches the beginning of a PPTP Start-Control-Connection-Reply packet
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result = string.match(response, "%z\156%z\001\026\043(.*)")
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local output
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if result ~= nil then
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local firmware
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local hostname
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local vendor
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-- get the firmware version (2 octets)
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local s1,s2
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s1,s2 = string.byte(result, 22, 23)
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firmware = s1 * 256 + s2
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-- get the hostname (64 octets)
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local s3
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s3 = string.sub(result, 24, 87)
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hostname = string.match(s3, "(.-)%z")
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-- get the vendor (should be 64 octets, but capture to end of the string to be safe)
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local s4, length
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length = string.len(result)
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s4 = string.sub(result, 88, length)
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vendor = string.match(s4, "(.-)%z")
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port.version.name = "pptp"
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port.version.name_confidence = 10
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if vendor ~= nil then port.version.product = vendor end
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if firmware ~= 0 then port.version.version = "(Firmware: " .. firmware .. ")" end
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if hostname ~= nil then port.version.hostname = hostname end
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port.version.service_tunnel = "none"
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port.version.fingerprint = nil
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nmap.set_port_version(host, port, "hardmatched")
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end
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end
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