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local ajp = require "ajp"
local shortport = require "shortport"
local stdnse = require "stdnse"
local table = require "table"
description = [[
Discovers which options are supported by the AJP (Apache JServ
Protocol) server by sending an OPTIONS request and lists potentially
risky methods.
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
]]
---
-- @usage
-- nmap -p 8009 <ip> --script ajp-methods
--
-- @output
-- PORT STATE SERVICE
-- 8009/tcp open ajp13
-- | ajp-methods:
-- | Supported methods: GET HEAD POST PUT DELETE TRACE OPTIONS
-- | Potentially risky methods: PUT DELETE TRACE
-- |_ See http://nmap.org/nsedoc/scripts/ajp-methods.html
--
-- @args ajp-methods.path the path to check or <code>/<code> if none was given
--
author = "Patrik Karlsson"
license = "Same as Nmap--See http://nmap.org/book/man-legal.html"
categories = {"default", "safe"}
portrule = shortport.port_or_service(8009, 'ajp13', 'tcp')
local arg_url = stdnse.get_script_args(SCRIPT_NAME .. ".path") or "/"
local UNINTERESTING_METHODS = { "GET", "HEAD", "POST", "OPTIONS" }
local function contains(t, elem)
for _, e in ipairs(t) do if e == elem then return true end end
return false
end
local function filter_out(t, filter)
local result = {}
for _, e in ipairs(t) do
if ( not(contains(filter, e)) ) then
result[#result + 1] = e
end
end
return result
end
local function fail(err) return ("\n ERROR: %s"):format(err or "") end
action = function(host, port)
local helper = ajp.Helper:new(host, port)
if ( not(helper:connect()) ) then
return fail("Failed to connect to server")
end
local status, response = helper:options(arg_url)
helper:close()
if ( not(status) or response.status ~= 200 or
not(response.headers) or not(response.headers['allow']) ) then
return "Failed to get a valid response for the OPTION request"
end
local methods = stdnse.strsplit(",%s", response.headers['allow'])
local output = {}
table.insert(output, ("Supported methods: %s"):format(stdnse.strjoin(" ", methods)))
local interesting = filter_out(methods, UNINTERESTING_METHODS)
if ( #interesting > 0 ) then
table.insert(output, "Potentially risky methods: " .. stdnse.strjoin(" ", interesting))
table.insert(output, "See http://nmap.org/nsedoc/scripts/ajp-methods.html")
end
return stdnse.format_output(true, output)
end