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local http = require "http"
local shortport = require "shortport"
local stdnse = require "stdnse"
local string = require "string"
description = [[
Checks if the target http server has mod_negotiation enabled. This
feature can be leveraged to find hidden resources and spider a web
site using fewer requests.
The script works by sending requests for resources like index and home
without specifying the extension. If mod_negotiate is enabled (default
Apache configuration), the target would reply with content-location header
containing target resource (such as index.html) and vary header containing
"negotiate" depending on the configuration.
For more information, see:
* http://www.wisec.it/sectou.php?id=4698ebdc59d15
* Metasploit auxiliary module
/modules/auxiliary/scanner/http/mod_negotiation_scanner.rb
]]
---
-- @usage
-- nmap --script=http-apache-negotiation --script-args http-apache-negotiation.root=/root/ <target>
--
-- @output
-- PORT STATE SERVICE
-- 80/tcp open http
-- |_http-apache-negotiation: mod_negotiation enabled.
--
-- @args http-apache-negotiation.root target web site root.
-- Defaults to <code>/</code>.
author = "Hani Benhabiles"
license = "Same as Nmap--See https://nmap.org/book/man-legal.html"
categories = {"safe", "discovery"}
portrule = shortport.http
action = function(host, port)
local root = stdnse.get_script_args("http-apache-negotiation.root") or "/"
-- Common default file names. Could add a couple more.
local files = {
'robots',
'index',
'home',
'blog'
}
for _, file in ipairs(files) do
local header = http.get(host, port, root .. file).header
-- Matching file. in content-location header
-- or negotiate in vary header.
if header["content-location"] and string.find(header["content-location"], file ..".")
or header["vary"] and string.find(header["vary"], "negotiate") then
return "mod_negotiation enabled."
end
end
end
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