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local base64 = require "base64"
local brute = require "brute"
local creds = require "creds"
local http = require "http"
local shortport = require "shortport"
local stdnse = require "stdnse"
description = [[
Performs brute force password guessing against HTTP proxy servers.
]]
---
-- @usage
-- nmap --script http-proxy-brute -p 8080 <host>
--
-- @output
-- PORT STATE SERVICE
-- 8080/tcp open http-proxy
-- | http-proxy-brute:
-- | Accounts
-- | patrik:12345 - Valid credentials
-- | Statistics
-- |_ Performed 6 guesses in 2 seconds, average tps: 3
--
-- @args http-proxy-brute.url sets an alternative URL to use when brute forcing
-- (default: http://scanme.insecure.org)
-- @args http-proxy-brute.method changes the HTTP method to use when performing
-- brute force guessing (default: HEAD)
author = "Patrik Karlsson"
license = "Same as Nmap--See https://nmap.org/book/man-legal.html"
-- maybe the script does not need to be in the external category
-- as most request should not "leave" the proxy.
categories = {"brute", "intrusive", "external"}
portrule = shortport.port_or_service({8123,3128,8000,8080},{'polipo','squid-http','http-proxy'})
local arg_url = stdnse.get_script_args(SCRIPT_NAME .. '.url') or 'http://scanme.nmap.org/'
local arg_method = stdnse.get_script_args(SCRIPT_NAME .. '.method') or "HEAD"
Driver = {
new = function(self, host, port)
local o = { host = host, port = port }
setmetatable(o, self)
self.__index = self
return o
end,
connect = function( self )
return true
end,
login = function( self, username, password )
-- the http library does not yet support proxy authentication, so let's
-- do what's necessary here.
local header = { ["Proxy-Authorization"] = "Basic " .. base64.enc(username .. ":" .. password) }
local response = http.generic_request(self.host, self.port, arg_method, arg_url, { header = header, bypass_cache = true } )
-- if we didn't get a 407 error, assume the credentials
-- were correct. we should probably do some more checks here
if ( response.status ~= 407 ) then
return true, creds.Account:new( username, password, creds.State.VALID)
end
return false, brute.Error:new( "Incorrect password" )
end,
disconnect = function( self )
return true
end,
}
-- checks whether the proxy really needs authentication and that the
-- authentication mechanism can be handled by our script, currently only
-- BASIC authentication is supported.
local function checkProxy(host, port, url)
local response = http.generic_request(host, port, arg_method, url, { bypass_cache = true })
if ( response.status ~= 407 ) then
return false, "Proxy server did not require authentication"
end
local proxy_auth = response.header["proxy-authenticate"]
if ( not(proxy_auth) ) then
return false, "No proxy authentication header was found"
end
local challenges = http.parse_www_authenticate(proxy_auth)
for _, challenge in ipairs(challenges) do
if ( "Basic" == challenge.scheme ) then
return true
end
end
return false, "The authentication scheme wasn't supported"
end
action = function(host, port)
local status, err = checkProxy(host, port, arg_url)
if ( not(status) ) then
return stdnse.format_output(false, err)
end
local engine = brute.Engine:new(Driver, host, port)
engine.options.script_name = SCRIPT_NAME
local result
status, result = engine:start()
return result
end
|
