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local http = require "http"
local nmap = require "nmap"
local shortport = require "shortport"
local stdnse = require "stdnse"
local string = require "string"
description = [[
Finds out what options are supported by an HTTP server by sending an
OPTIONS request. Lists potentially risky methods. Optionally tests each
method individually to see if they are subject to e.g. IP address
restrictions.
In this script, "potentially risky" methods are anything except GET,
HEAD, POST, and OPTIONS. If the script reports potentially risky
methods, they may not all be security risks, but you should check to
make sure. This page lists the dangers of some common methods:
http://www.owasp.org/index.php/Testing_for_HTTP_Methods_and_XST_%28OWASP-CM-008%29
The list of supported methods comes from the contents of the Allow and
Public header fields. In verbose mode, a list of all methods is printed,
followed by the list of potentially risky methods. Without verbose mode,
only the potentially risky methods are shown.
]]
---
-- @args http-methods.url-path The path to request. Defaults to
-- <code>/</code>.
-- @args http-methods.retest If defined, do a request using each method
-- individually and show the response code. Use of this argument can
-- make this script unsafe; for example <code>DELETE /</code> is
-- possible.
--
-- @output
-- 80/tcp open http
-- | http-methods: GET HEAD POST OPTIONS TRACE
-- | Potentially risky methods: TRACE
-- | See http://nmap.org/nsedoc/scripts/http-methods.html
-- | GET / -> HTTP/1.1 200 OK
-- | HEAD / -> HTTP/1.1 200 OK
-- | POST / -> HTTP/1.1 200 OK
-- | OPTIONS / -> HTTP/1.1 200 OK
-- |_TRACE / -> HTTP/1.1 200 OK
--
-- @usage
-- nmap --script=http-methods.nse --script-args http-methods.retest=1 <target>
-- nmap --script=http-methods.nse --script-args http-methods.url-path=/website <target>
author = "Bernd Stroessenreuther <berny1@users.sourceforge.net>"
license = "Same as Nmap--See http://nmap.org/book/man-legal.html"
categories = {"default", "safe"}
-- We don't report these methods except with verbosity.
local UNINTERESTING_METHODS = {
"GET", "HEAD", "POST", "OPTIONS"
}
local filter_out, merge_headers
portrule = shortport.http
action = function(host, port)
local url_path, retest_http_methods
local response, methods, options_status_line, output
-- default vaules for script-args
url_path = stdnse.get_script_args("http-methods.url-path") or "/"
retest_http_methods = stdnse.get_script_args("http-methods.retest") ~= nil
response = http.generic_request(host, port, "OPTIONS", url_path)
if not response.status then
stdnse.print_debug("http-methods: OPTIONS %s failed.", url_path)
return
end
-- Cache in case retest is requested.
options_status_line = response["status-line"]
stdnse.print_debug("http-methods.nse: HTTP Status for OPTIONS is " .. response.status)
if not (response.header["allow"] or response.header["public"]) then
return string.format("No Allow or Public header in OPTIONS response (status code %d)", response.status)
end
-- The Public header is defined in RFC 2068, but was removed in its
-- successor RFC 2616. It is implemented by at least IIS 6.0.
methods = merge_headers(response.header, {"Allow", "Public"})
output = {}
if nmap.verbosity() > 0 then
output[#output + 1] = stdnse.strjoin(" ", methods)
end
local interesting = filter_out(methods, UNINTERESTING_METHODS)
if #interesting > 0 then
output[#output + 1] = "Potentially risky methods: " .. stdnse.strjoin(" ", interesting)
output[#output + 1] = "See http://nmap.org/nsedoc/scripts/http-methods.html"
end
-- retest http methods if requested
if retest_http_methods then
local _
for _, method in ipairs(methods) do
local str
if method == "OPTIONS" then
-- Use the saved value.
str = options_status_line
else
response = http.generic_request(host, port, method, url_path)
if not response.status then
str = "Error getting response"
else
str = response["status-line"]
end
end
output[#output + 1] = string.format("%s %s -> %s", method, url_path, str)
end
end
return #output > 0 and stdnse.strjoin("\n", output) or nil
end
local function contains(t, elem)
local _, e
for _, e in ipairs(t) do
if e == elem then
return true
end
end
return false
end
function filter_out(t, filter)
local result = {}
local _, e, f
for _, e in ipairs(t) do
if not contains(filter, e) then
result[#result + 1] = e
end
end
return result
end
-- Split header field contents on commas and return a table without duplicates.
function merge_headers(headers, names)
local seen = {}
local result = {}
for _, name in ipairs(names) do
name = string.lower(name)
if headers[name] then
for _, v in ipairs(stdnse.strsplit(",%s*", headers[name])) do
if not seen[v] then
result[#result + 1] = v
end
seen[v] = true
end
end
end
return result
end