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local http = require "http"
local shortport = require "shortport"
local stdnse = require "stdnse"
local string = require "string"
description = [[
Displays the contents of the "generator" meta tag of a web page (default: /) if there is one.
]]
author = "Michael Kohl"
license = "Same as Nmap--See http://nmap.org/book/man-legal.html"
categories = {"default", "discovery", "safe"}
---
-- @usage
-- nmap --script http-generator [--script-args http-generator.path=<path>,http-generator.redirects=<number>,...] <host>
--
-- @output
-- PORT STATE SERVICE
-- 80/tcp open http
-- |_http-generator: TYPO3 4.2 CMS
-- 443/tcp open https
-- |_http-generator: TYPO3 4.2 CMS
--
-- @args http-generator.path Specify the path you want to check for a generator meta tag (default to '/').
-- @args http-generator.redirects Specify the maximum number of redirects to follow (defaults to 3).
-- Changelog:
-- 2011-12-23 Michael Kohl <[email protected]>:
-- + Initial version
-- 2012-01-10 Michael Kohl <[email protected]>:
-- + update documentation
-- + make pattern case insensitive
-- + only follow first redirect
-- 2012-01-11 Michael Kohl <[email protected]>:
-- + more generic pattern
-- + simplified matching
-- 2012-01-13 Michael Kohl <[email protected]>:
-- + add http-generator.path argument
-- + add http-generator.redirects argument
-- + restructure redirect handling
-- + improve redirect pattern
-- + update documentation
-- + add changelog
-- TODO:
-- more generic generator pattern
-- helper function
local follow_redirects = function(host, port, path, n)
local pattern = "^[hH][tT][tT][pP]/1.[01] 30[12]"
local response = http.get(host, port, path)
while (response['status-line'] or ""):match(pattern) and n > 0 do
n = n - 1
local loc = response.header['location']
response = http.get_url(loc)
end
return response
end
portrule = shortport.http
action = function(host, port)
local response, loc, generator
local path = stdnse.get_script_args('http-generator.path') or '/'
local redirects = tonumber(stdnse.get_script_args('http-generator.redirects')) or 3
-- Worst case: <meta name=Generator content="Microsoft Word 11">
local pattern = '<meta name="?generator"? content="([^\"]*)" ?/?>'
-- make pattern case-insensitive
pattern = pattern:gsub("%a", function (c)
return string.format("[%s%s]", string.lower(c),
string.upper(c))
end)
response = follow_redirects(host, port, path, redirects)
if ( response and response.body ) then
return response.body:match(pattern)
end
end