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Current Path : /proc/2/root/usr/share/nmap/scripts/
Current File : //proc/2/root/usr/share/nmap/scripts/http-methods.nse
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"}

require("http")
require("nmap")
require("shortport")
require("stdnse")

-- 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 = nmap.registry.args["http-methods.url-path"] or "/"
	retest_http_methods = nmap.registry.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
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