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Dir : ~/proc/6955/root/usr/share/nmap/scripts/

Edit File: http-cors.nse

local http = require "http"
local nmap = require "nmap"
local shortport = require "shortport"
local stringaux = require "stringaux"
local table = require "table"

description = [[
Tests an http server for Cross-Origin Resource Sharing (CORS), a way
for domains to explicitly opt in to having certain methods invoked by
another domain.

The script works by setting the Access-Control-Request-Method header
field for certain enumerated methods in OPTIONS requests, and checking
the responses.
]]

---
-- @args http-cors.path The path to request. Defaults to
-- <code>/</code>.
--
-- @args http-cors.origin The origin used with requests. Defaults to
-- <code>example.com</code>.
--
-- @usage
-- nmap -p 80 --script http-cors <target>
--
-- @output
-- 80/tcp open
-- |_cors.nse: GET POST OPTIONS

author = "Toni Ruottu"
license = "Same as Nmap--See https://nmap.org/book/man-legal.html"
categories = {"default", "discovery", "safe"}

portrule =  shortport.http

local methods = {"HEAD", "GET", "POST", "PUT", "DELETE", "TRACE", "OPTIONS", "CONNECT", "PATCH"}

local function origin_ok(raw, origin)
  if not raw then
    return false
  end
  if raw == "*" then
    return true
  end
  if raw == "null" then
    return false
  end
  local allowed = stringaux.strsplit(" ", raw)
  for _, ao in ipairs(allowed) do
    if origin == ao then
      return true
    end
  end
  return false
end

local function method_ok(raw, method)
  if not raw then
    return false
  end
  local stuff = stringaux.strsplit(" ", raw)
  local nospace = table.concat(stuff, "")
  local allowed = stringaux.strsplit(",", nospace)
  for _, am in ipairs(allowed) do
    if method == am then
      return true
    end
  end
  return false
end

local function test(host, port, method, origin)
  local header = {
    ["Origin"] = origin,
    ["Access-Control-Request-Method"] = method,
  }
  local response = http.generic_request(host, port, "OPTIONS", "/", {header = header})
  local aorigins = response.header["access-control-allow-origin"]
  local amethods = response.header["access-control-allow-methods"]
  local ook = origin_ok(aorigins, response)
  local mok = method_ok(amethods, method)
  return ook and mok
end

action = function(host, port)
  local path = nmap.registry.args["http-cors.path"] or "/"
  local origin =  nmap.registry.args["http-cors.origin"] or "example.com"
  local allowed = {}
  for _, method in ipairs(methods) do
    if test(host, port, method, origin) then
      table.insert(allowed, method)
    end
  end
  if #allowed > 0 then
    return table.concat(allowed, " ")
  end
end